U.S. patent application number 15/117889 was filed with the patent office on 2017-03-23 for cable gripping device and optical fiber connector.
The applicant listed for this patent is 3M INNOVATIVE PROPERTIES COMPANY. Invention is credited to Takaya Yamauchi, Akihiko Yazaki.
Application Number | 20170082807 15/117889 |
Document ID | / |
Family ID | 54055374 |
Filed Date | 2017-03-23 |
United States Patent
Application |
20170082807 |
Kind Code |
A1 |
Yazaki; Akihiko ; et
al. |
March 23, 2017 |
CABLE GRIPPING DEVICE AND OPTICAL FIBER CONNECTOR
Abstract
A cable gripping structure for securing an optical fiber cable
in an optical fiber connector possesses a base part and a pair of
support walls disposed opposite one another on the base part, and
blade parts for gripping the optical fiber cable are disposed on
the pair of support walls, at the tip ends thereof and separated
from the bases of the support walls.
Inventors: |
Yazaki; Akihiko; (Tokyo,
JP) ; Yamauchi; Takaya; (Sagamihara, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
3M INNOVATIVE PROPERTIES COMPANY |
Saint Paul |
MN |
US |
|
|
Family ID: |
54055374 |
Appl. No.: |
15/117889 |
Filed: |
March 5, 2015 |
PCT Filed: |
March 5, 2015 |
PCT NO: |
PCT/JP2015/056514 |
371 Date: |
August 10, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 6/3806 20130101;
G02B 6/3821 20130101; G02B 6/3887 20130101; G02B 6/387 20130101;
G02B 6/3893 20130101 |
International
Class: |
G02B 6/38 20060101
G02B006/38 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 5, 2014 |
JP |
2014-043046 |
Claims
1. A cable gripping structure for securing an optical fiber cable
in an optical fiber connector, comprising: a base part; and a pair
of support walls disposed opposite one another on the base part;
and blade parts for gripping the optical fiber cable being disposed
on the pair of support walls at tip ends thereof and separated from
bases of the support walls.
2. The cable gripping structure of claim 1, wherein: the blade
parts can grip a first cable, as well as a second cable in which a
dimension of a long side or a short side in cross-section thereof
is smaller than that of the first cable; and a length dimension of
the blade parts is equal to or greater than the dimension of the
long side in cross-section of the second cable, and is less than
the dimension of the long side in cross-section of the first
cable.
3. The cable gripping structure of claim 1, wherein the pair of
support walls comprise a thin part in which a wall thickness formed
toward the tip end of the support wall is small, and a thick part
in which a wall thickness formed toward the base end of the support
wall is greater than that of the thin part.
4. The cable gripping structure of claim 3, wherein a boundary part
between the thin part and the thick part is formed between the base
of the support wall and the blade part.
5. An optical fiber connector into which an end of an optical fiber
cable is installed, the optical fiber connector comprising: a
connector body in which a mounting part is formed for mounting the
optical fiber cable; and a cover part that couples with the
mounting part; the mounting part being formed by at least one
surface of a back end portion of the connector body being notched
out; and the cover part comprising the cable gripping structure of
claim 1, and being disposed to be rotatable relative to the
mounting part so as to cover the mounting part.
6. The optical fiber connector of claim 5, wherein: a floor surface
is provided in the mounting part opposite the tips of the support
walls in the state with the cover part covering the mounting part;
and a pressing part, capable of pressing the optical fiber cable,
is provided in the floor surface protruding from the floor surface
and located in between the pair of support walls in the state with
the cover part covering the mounting part.
7. The optical fiber connector of claim 5, wherein a protrusion is
provided in the cover part between the pair of support walls,
protruding from the base ends toward the tip ends thereof.
8. The optical fiber connector of claim 6, wherein a protrusion is
provided in the cover part between the pair of support walls,
protruding from the base ends toward the tip ends thereof.
9. The cable gripping structure of claim 2, wherein the pair of
support walls comprise a thin part in which a wall thickness formed
toward the tip end of the support wall is small, and a thick part
in which a wall thickness formed toward the base end of the support
wall is greater than that of the thin part.
10. The cable gripping structure of claim 9, wherein a boundary
part between the thin part and the thick part is formed between the
base of the support wall and the blade part.
Description
BACKGROUND
[0001] Technical Field
[0002] An embodiment of the present invention relates to a cable
gripping structure and optical fiber connector.
[0003] Related Art
[0004] In the past, it was known that, when installing optical
fiber connectors on optical fiber cables of multiple different
sizes of outside diameter, optical fiber holders were employed that
could be affixed to the optical fiber connector. For example, an
optical fiber holder is disclosed in Japanese Unexamined Patent
Application Publication No. 2010-197553 (Patent Document 1) in
which protrusions are formed in both walls of a void for
accommodating an optical fiber cable, protruding from the wall
surfaces toward the center thereof With this optical fiber holder,
when an optical fiber cable is inserted into the void in which the
protrusions have been formed, the cable is gripped by the
protrusions biting into the cable.
BACKGROUND DOCUMENTS
Patent Documents
[0005] Patent Document 1: Japanese Unexamined Patent Application
Publication No. 2010-197553
OVERVIEW OF THE INVENTION
Problems to be Solved by the Invention
[0006] However, with the conventional optical fiber holder, in
order for an optical cable to be gripped along an entire height
direction, the protrusions formed in the wall surfaces were
contiguously formed from the base of the wall surface to the tip
thereof In this case, the protrusions functioned as ribs, making it
difficult for the pair of wall surfaces to deform. Additionally,
when gripping a large diameter cable, the wall surfaces would
deform completely from the base end. Therefore, when protrusions
were designed for a small diameter cable, for example, there was a
risk that it would be difficult to insert a large diameter cable.
On the other hand, when protrusions were designed for a large
diameter cable, there was a risk that it would be difficult to
suitably grip a small diameter cable. Consequently, there was a
demand for a cable gripping structure and optical fiber connector
with improved operability that could suitably grip optical fiber
cables of multiple various diameters.
SUMMARY
[0007] The cable gripping structure of an embodiment of the present
invention is a cable gripping structure for securing an optical
fiber cable in an optical fiber connector, which possesses a base
part and a pair of support walls disposed opposite one another on
the base part. Blade parts for gripping the optical fiber cable are
disposed on the pair of support walls at tip ends thereof and
separated from bases of the support walls.
[0008] In the cable gripping structure of such an embodiment, the
blade parts for gripping the optical fiber cable are disposed at
the tips of the support walls, separated from the bases thereof.
Therefore, even in a situation in which a dimension between the
blade parts has been set to be able to adequately grip a
small-diameter optical fiber cable, if a large-diameter optical
fiber cable is inserted, the blades need not bite greatly into the
cable. Therefore, less force is required to insert the optical
fiber cable than in cases wherein the blade parts are contiguously
formed from the bases. In this way, the cable gripping structure
can suitably grip optical fiber cables of multiple various
diameters and operability can be improved.
[0009] Additionally, in another cable gripping structure
embodiment, the blade parts can grip a first cable, as well as a
second cable in which a dimension of a long side or short side in
cross-section thereof is smaller than that of the first cable, and
a length dimension of the blade parts is equal to or greater than
the dimension of the long side in cross-section of the second cable
and may be less than the dimension of the long side in
cross-section of the first cable.
[0010] Additionally, in another cable gripping structure
embodiment, the pair of support walls may possess a thin part, in
which a wall thickness formed toward the tip end of the support
wall is small, and a thick part, in which a wall thickness formed
toward the base end of the support wall is greater than that of the
thin part.
[0011] Additionally, in another cable gripping structure
embodiment, a boundary part between the thin part and thick part
may be formed between the base of the support wall and the blade
part.
[0012] Additionally, the optical fiber connector of an embodiment
of the present invention is an optical fiber connector into which
an end of an optical fiber cable is installed, which is equipped
with a connector body in which a mounting part is formed for
mounting the optical fiber cable, and a cover part that couples
with the mounting part. The mounting part is formed by at least one
surface of a back end portion of the connector body being notched
out. The cover part is equipped with a cable gripping structure,
and is disposed to be rotatable relative to the mounting part so as
to cover the mounting part.
[0013] Additionally, in another embodiment of the optical fiber
connector of the present invention, a floor surface is provided in
the mounting part opposite the tips of the support walls in the
state with the cover part covering the mounting part, wherein a
pressing part, capable of pressing the optical fiber cable, may be
provided in the floor surface protruding from the floor surface and
located between the pair of support walls in the state with the
cover part covering the mounting part.
[0014] Additionally, in another optical fiber connector embodiment,
a protruding part may be provided in the cover part between the
pair of support walls, protruding from the base ends toward the tip
ends thereof.
Effect of the Invention
[0015] According to an aspect of the present invention, optical
fiber cables of multiple various diameters can be suitably gripped,
while improving workability.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is an exploded perspective view showing an optical
fiber connector of an embodiment.
[0017] FIG. 2 is a perspective view showing an optical fiber
connector in a state with the cover part open.
[0018] FIG. 3 is a perspective view showing an optical fiber
connector in a state with the cover part closed.
[0019] FIG. 4 is a perspective view showing the cover part.
[0020] FIG. 5(a) is an elevation view of the cover part. FIG. 5(b)
is a bottom view of the same.
[0021] FIG. 5(c) is a cross sectional view of the same.
[0022] FIG. 6(a) through FIG. 6(c) are cross sectional views
showing the state with the mounting part and cover part
coupled.
DETAILED DESCRIPTION
[0023] Embodiments of the present invention will be described in
detail below, referring to the attached drawings. For convenience,
substantially identical elements will be assigned the same
reference numbers, and descriptions thereof may be omitted.
Additionally, the terms "X-axis direction," "Y-axis direction," and
"Z-axis direction" are for convenience, based on the illustrated
directions.
[0024] FIG. 1 is an exploded perspective view showing an optical
fiber connector 1 of the present embodiment. FIG. 2 is a
perspective view showing the optical fiber connector 1 in a state
with a cover part 5 open. FIG. 3 is a perspective view showing the
optical fiber connector 1 in a state with an optical fiber cable
mounted and the cover part 5 closed. As shown in FIG. 1 through
FIG. 3, the optical fiber connector 1 is equipped with connector
body 2, which is formed with a mounting part 3 at the back, in
which the optical fiber cable 100 is mounted, and the cover part 5
that couples with the mounting part 3. Further, the lengthwise
direction in which the optical fiber connector 1 extends shall be
the "X-axis direction" for the purposes of explanation. In the
present embodiment, the optical fiber connector 1 is installed at
the tip of the optical fiber cable so that the optical fiber cable
extends along the lengthwise direction in which the optical fiber
connector 1 extends. Additionally, the thickness direction of the
optical fiber connector 1 shall be the "Z-axis direction." The
direction perpendicular to the X-axis direction and the Z-axis
direction, namely, the width direction of the optical fiber
connector 1, shall be the "Y-axis direction." Further, the tip end
of the optical fiber connector 1 shall be the "front (positive
X-axis end)," and the end in which the optical fiber cable is
inserted shall be the "back (negative X-axis end)." Additionally,
the side on which the operation of pressing on cap 18, described
below, is performed shall be the "top (positive Z-axis side)," and
the opposite side from that shall be the "bottom (negative Z-axis
side)." Additionally, a central axis CL for the optical fiber
connector 1 is set extending parallel to the X-axis direction.
Unless specifically noted, members described in the present
application possess a planar symmetric structure with the XZ plane
through which the central-axis CL passes as the plane of
reference.
[0025] The connector body 2 is equipped with a base part 11, a
shell 12, and an optical fiber connector 13. The connector body 2
is constituted with the optical fiber connector 13 built into the
base part 11, so that the outer circumference of the base part 11
is covered by the shell 12. Further, e.g., an SC-type optical
connector may be used as the connector body 2. FC-type optical
connectors. ST-type optical connectors, and LC-type optical
connectors are considered as other examples thereof. The
explanation in this Specification shall be given using an SC-type
optical connector, but this SC-type optical connector is merely an
example and the invention of the present application is not limited
to this kind of connector.
[0026] The base part 11 is a rectangular tube-shaped member that
extends in the lengthwise direction (X-axis direction), which is
equipped with an upper wall 21 disposed on the top (positive Z-axis
side), a floor wall 22 disposed on the bottom (negative Z-axis
side), opposite the upper wall 21, and side walls 23, 24 opposing
each other in the width direction (Y-axis direction). The shell 12
is a rectangular tube-shaped member that extends in the lengthwise
direction, which is equipped with an upper wall 26 disposed on the
top, a floor wall 27 disposed on the bottom opposite the upper wall
26, and side walls 28, 29 opposing each other in the width
direction. The shell 12 fits onto the base part 11 so as to cover
the outer circumferential surfaces thereof at the front end, with
the upper wall 28, floor wall 27, and side walls 28, 29 of the
shell 12 respectively covering the upper wall 21, floor wall 22,
and side walls 23, 24 of the base 11.
[0027] The optical fiber connector 13 is equipped with a
cylindrical collar 14 that extends in the lengthwise direction
(X-axis direction) and a ferrule 16 that is disposed at a tip of
14a of the collar. The collar 14 possesses a through hole 14c at a
back end 14d thereof for inserting an optical fiber that has been
inserted from the back end of the connector body 2. Further, a
spring 19 is disposed at the back end 14d of the collar 14,
encircling the collar 14. This spring 19 exerts elastic force
toward the connector tip end of the collar 14 inside the base 11,
thereby keeping pressure on the ferrule 16 and maintaining contact
with a ferrule that is built into another optical fiber connector
that is to be coupled with the optical fiber connector 1. Further,
an optical fiber introduction hole (not illustrated) is formed in
the ferrule 16 along the central axis CL, and the connecting
optical fiber (not illustrated) is inserted and secured in this
optical fiber introduction hole. This ferrule 16 is coupled with
the tip 14a so that the central axis aligns with the collar 14.
[0028] An open portion 14b is formed in the collar 14 that opens
upward (Z-axis direction), and a core anchoring part (not
illustrated) is accommodated inside the open portion 14b.
Additionally, a cap 18 for pressing on the core anchoring part from
above is disposed in the open portion 14b of the collar 14. Open
portions 11a, 12a are respectively formed in the upper wall 21 of
the base 11 and the upper wall 26 of the shell 12, at locations
corresponding to the open portion 14b of the collar 14.
Consequently, the cap 18 is in a state exposed through the shell
12.
[0029] The connecting optical fiber and the optical fiber in the
optical fiber cable 100 that has been inserted from the back end of
the connector body 2 are in a state abutted against, and optically
connected to, one another in the core anchoring part. Inserting the
cap 18 in this state anchors the optical fiber in the optical fiber
cable 100 and the connecting optical fiber. In this Specification,
the state of the optical fiber connector 1 being "installed" on the
end of an optical fiber indicates a state in which the optical
fiber has been anchored by connecting the connector body 2 to the
optical fiber and coupling the cover part 5 with the mounting part
3, whereby the optical fiber connecter 1 has been completely
attached to the end of the optical fiber and can be connected to
another connector.
[0030] In the state in which the outer circumference of the base
part 11 has been completely covered by the shell 12, the upper wall
21, which is one of the surfaces that constitutes the outer
circumference, is notched out at the back end of the base part 11,
and the mounting part 3, in which the optical fiber cable 100 is
installed, is formed by the floor wall 31 and side walls 32,
33.
[0031] The mounting part 3 is for mounting an optical fiber cable
100 that is disposed along the lengthwise direction of the mounting
part 3, wherein the optical fiber cable 100 is disposed at the back
end 3b and the optical fiber is disposed at the front end 3a with
the cladding of the optical fiber cable 100 removed. The mounting
part 3, as shown in FIG. 2, has a U-shape in cross-section, which
is open in the upward direction, extending rearward in the
lengthwise direction from a back end 12c of the shell 12 of the
connector body 2. The mounting part 3 is equipped with a floor wall
31 disposed on the bottom and side walls 32, 33 opposing each other
in the width direction. A pair of grooves 34a, 34b are formed on
the left and right, leaving a center portion, toward the back in
the floor wall surface 31a on the upper surface of the floor wall
31. In other words, if these grooves 34a, 34b are considered the
floor surface 35, the floor surface 35 has a shape toward the back
of the floor wall surface 31 a in which the center portion
protrudes upward in the left and right directions. The protruding
portion constitutes a pressing part 36, described below. An
insertion hole 3c is formed at the back end 3a side of the mounting
part 3 that communicates to the core anchoring part, so that an
optical fiber installed in the mounting part 3 is inserted passing
therethrough. Shaft parts 37a, 37b for rotatably connecting the
cover part 5 are formed toward the front end side on the outer wall
surfaces 32a, 33a of the side walls 32, 33. Additionally, a pair of
latch parts 38 for coupling the mounting part 3 and the cover part
5, when the mounting part 3 is in a state covered by the cover part
5, are formed toward the back end in the outer wall surfaces 32a,
33a (the latch part in the outer wall surface 33a is not
illustrated). The latch parts 38 are provided protruding outward
from the outer wall surfaces 32a, 33a.
[0032] As shown in FIG. 1 through FIG. 3, the cover part 5 is for
anchoring the optical fiber cable 100 in the optical fiber
connector 1 when in the state coupled with the mounting part 3 and
covering the mounting part 3 from above. The cover part 5 is
equipped with a rectangular plate-shaped upper wall 51 and side
walls 52, 53 that are disposed on either side in the horizontal
direction of the upper wall 51, and possesses a cable gripping
structure 6 between the side walls 52, 53 for gripping an optical
fiber cable 100. Circular through holes 57a, 57b are formed
corresponding to the shaft parts 37a, 37b on the mounting part 3 at
one end in the lengthwise direction of the side walls 52, 53.
Fitting the through holes 57a, 57b of the cover part 5 onto the
shaft parts 37a, 37b on the mounting part 3 rotatably couples the
cover part 5 to the mounting part 3. Additionally, latch
receptacles 58 are formed as rectangular through holes
corresponding to the latch parts 38 on the mounting part 3 at the
other end side in the lengthwise direction of the side walls 52,
53. Fitting the latch parts 38 on the mounting part 3 into the
latch receptacles 58 on the cover part 5, which has been coupled to
the mounting part 3, creates a state in which the mounting part 3
is covered by the cover part 5. In the state in which the cover
part 5 is thus coupled with the mounting part 3, the cover part 5
has a U-shape in cross-section, which is open in the downward
direction.
[0033] FIG. 4 is a perspective view showing the cover part 5.
Additionally, FIG. 5(a) is an elevation view of the cover part,
FIG. 5(b) is a bottom view of the same, and FIG. 5(c) is a cross
sectional view of the same. In the description of the cover part 5,
based on the state in which the cover part 5 and the mounting part
3 are coupled, with the cover part 5 covering the mounting part 3
(see FIG. 3), the X-axis direction of the cover part 5 in this
configuration shall be the "lengthwise direction," the positive
X-axis direction shall be the "front," and the negative X-axis
direction shall be the "back." Additionally, in this configuration,
the Z-axis direction shall be the "height direction," and the
positive Z-axis direction shall be "up," while the negative Z-axis
direction shall be "down."
[0034] As shown in FIG. 4 and FIG. 5, the cable gripping structure
6 formed in the cover part 5 is equipped with a pair of support
walls 63, 64, provided with a base part 62 as the base end thereof,
and blades 65, 66 that are formed toward tip ends 63a, 64a of the
support walls 63, 64. Further, the area toward the back end 51a of
the upper wall 51 is constructed as a base part 62. Additionally,
the portion of the base part 62 between the support walls 63, 64 is
formed to protrude from the inner surface 61b of the upper wall 51
toward the tips 63a, 64a of the support walls 63, 64. Further, the
tip end in this protruding portion is described below, where it
will be referred to as "edge 62a of the base part 62." The support
walls 63, 64 are formed protruding from the base part 62 toward the
back end of the cover part 5 between the side walls 52, 53, and are
disposed facing one another so as to be parallel with the side
walls 52, 53. Step parts 63c, 64c are formed at a specified
location in the height direction, extending in the lengthwise
direction, on the outer surfaces 63b, 64b of the support walls 63
64. The tip 63a, 64a ends of the support walls 63, 64 constitute
thin parts 63d, 64d with a smaller wall thickness (thickness in the
Y-axis direction), and the base ends (toward the base part 62) of
the support walls 63, 64 constitute thick parts 63e, 64e with a
greater wall thickness, where this step part 63c, 64c constitutes
the boundary 67a, 67b therebetween. In the present embodiment, the
step parts 63c, 64c are formed below the midpoint in the height
direction of the support walls 63, 64.
[0035] As shown in FIG. 5(b), blades 65, 66 are formed protruding
in the Z-axis view from inner surfaces 63g, 64g of the support
walls 63, 64. In the present embodiment, three blades 65, 66 are
respectively formed aligned at intervals in the lengthwise
direction on the inner surfaces 63g, 64g of each of the support
walls 63, 64, but there may be more or fewer than three. The front
surfaces 65a, 66a of the blades 65, 66 (the surfaces toward the
front in the state in which the mounting part 3 and cover part are
linked together) are formed perpendicular to the support walls 63,
64, and the back surfaces 65b, 66b of the blades 65, 66 (the
surfaces toward the back in the state in which the mounting part 3
and cover part are linked together) are formed inclined toward the
front. Thus, the gripping strength against pulling out the optical
fiber cable 100 in the lengthwise direction is increased by the
blades 65, 66 having a roughly triangular shape viewed in the
Z-axis direction, with a right angle formed on the front side.
Additionally, as shown in FIG. 5(a), the blades 65, 66 are disposed
at the tips 63a, 64a of the support walls 63, 64, separated from
the base ends thereof Specifically, the blades 65, 66 extend in the
vertical direction from a specified height away from the base 62
(edge 62 of the base 62) to the tips of the support walls 63, 64.
The edge 62a of the base 62 (i.e., the base end of the support wall
63, 64) and ends 65c, 66c on the base 62 end of the blades 65, 66
are separated from one another. Additionally, the blades 65, 66 are
provided with inclined parts 65f, 66f toward tips 63a, 64a of the
support walls 63, 64 that incline so that the gaps therebetween
increase. This facilitates the insertion of an optical fiber cable
100 between the blades 65, 66 from the tips of 63a 64a of the
support walls 63, 64. In the present embodiment, boundary 67a, 67b
between the thin part 63d, 64d and thick part 63e, 64e (step 63c,
64c) is formed at a height position between the base end of the of
the support wall 63, 64 and the end 65c, 66c of the blade 65, 66 on
the base 62 end (in the height range where the blades 65, 66 are
not formed on the support walls 63, 64), but may also be formed at
the same height position of the end of the blades 65, 66 on the
base 62 end or a position slightly above this.
[0036] Additionally, a protrusion 69 is provided in the base 62 of
the cover part 5, protruding between the pair of support walls 63,
64 from the base toward the tip end thereof The protrusion 69 is to
steadily support the optical fiber cable 100 in cases in which a
small-diameter optical fiber cable 100 is being gripped by the
blades 65, 66, and at least two are provided at an interval in the
lengthwise direction in the present embodiment. The protrusion 69
is provided protruding from a surface that is a step lower than the
edge 62a of the base 62. The protrusion 69 is angled toward the
front from the base 69a to the tip 69b thereof. Therefore, in the
case of a large-diameter optical fiber cable 100, the protrusion 69
will be easily deformed toward the front when pressed by the
optical fiber cable that has been inserted.
[0037] Next, the conditions will be described, referring to FIG. 6,
in which optical fiber cables 100 have been installed in the cable
gripping structure 6 in the optical fiber connector 1.
[0038] Cases of installing a large-diameter optical fiber cable
(first cable) 101 and a small-diameter optical fiber cable with
smaller dimensions of the long side and short side in cross-section
than the large-diameter optical fiber cable (second cable) 102 will
be described herein. The dimensions of the long side 101a and short
side 101b in the cross section of the large-diameter optical fiber
cable 101 are, e.g., approximately 3 mm and approximately 2 mm, and
the dimensions of the long side 102a and short side 102b in the
cross section of the small-diameter optical fiber cable 102 are,
e.g., approximately 2 mm and approximately 1.6 mm. In the present
embodiment, the length dimension of the blades 65, 66 is equal to
or greater than the dimension of the long side 102a in
cross-section of the small-diameter optical fiber cable 102 and
less than the dimension of the long side 101a in cross-section of
the large-diameter optical fiber cable 101. Further, the length
dimension of the blades 65, 66 is the dimension from the end 65c,
66c on the base 62 side of the blade 65, 66 to the tip 65d, 66d
thereof, and includes the length of the inclined part 65f, 66f.
[0039] FIG. 6(a) through FIG. 6(c) are cross sectional views that
schematically show the state with the mounting part 3 and cover
part 5 coupled (state with the cover part 5 covering the mounting
part 3). FIG. 6(a) is the state in which an optical fiber cable 100
is not being gripped. As shown in FIG. 6(a), in the state with the
mounting part 3 and cover part 5 coupled, the floor surface 35 of
the mounting part 3 and tips 63a, 64a of the support walls 63, 64
are opposite each other, and the pressing part 36 protruding from
the floor surface 35 is positioned between the support walls 63,
64. In this state, the height position of the upper end 36a of the
pressing part 36 is roughly the same position as the height of base
side end 65f1, 66f1 of the inclined part 65f, 66f. Additionally, in
the present embodiment, a distance L1 from the upper end 36a of the
pressing part 36 to the edge of the protrusion 69 is roughly equal
to the dimension of the long side 102a in cross-section of the
small-diameter optical fiber cable 102, and the distance L2 from
the upper end 36a of the pressing part 36 to the base 62 is roughly
equal to the dimension of the long side 101a in cross-section of
the large-diameter optical fiber cable 101 (see FIG. 6(a) and FIG.
6(b)).
[0040] FIG. 6(b) shows a state in which a small-diameter optical
fiber cable 102 has been gripped, that is, a state is shown where
the cover part 5 and mounting part 3 are coupled in a state in
which the small-diameter optical fiber cable 102 has been disposed
on the pressing part 36. As shown in FIG. 6(b), the optical fiber
cable 102 is gripped by the blades 65, 66, which bite into the left
and right long sides 102a of the optical fiber cable 102. With the
operation of coupling the cover part 5 and the mounting part 3, the
optical fiber cable 102 is pinched by the pressing part 36 and the
blades 65, 66. At this time, the optical fiber cable 102 touching
the blades 65, 66 is relatively pressed toward the blades 65, 66 by
the pressing part 36. Thus, the optical fiber cable 102 is
gradually pressed on by the pressing part 36, and thereby pushed
into a specified position between the blades 65, 66. When this kind
of pressing operation is performed, it becomes difficult for an
operator to press if more than 70 N of force is required. In the
present embodiment, the force required for this compression (the
operation of coupling the cover part 5 and the mounting part 3) is
around 40 N. In the state with the cover part 5 and mounting part 3
coupled, the protrusion 69 comes in contact with the optical fiber
cable 102, preventing the optical fiber cable 102 from shifting out
of position. In the state in which the optical fiber cable 102 has
been gripped, the support walls 63, 64 are pushed slightly apart in
the width direction by the optical fiber cable 102. At this time,
the drawing force required to pull the optical fiber cable 102 in
the lengthwise direction is, e.g., around 30 N.
[0041] FIG. 6(c) is the state in which a large-diameter optical
fiber cable 101 has been gripped, that is, a case is shown where
the cover part 5 and mounting part 3 are coupled in a state in
which the large-diameter optical fiber cable 101 has been disposed
on the pressing part 36. As shown in FIG. 6(c), the optical fiber
cable 101 is gripped by the blades 65, 66 toward the bottom of the
long sides 101a of the optical fiber cable 101. As in the case of
the optical fiber cable 102, the operation of coupling the cover
part 5 and the mounting part 3 gradually presses the optical fiber
cable 101 with the pressing part 36, until it is pushed all the way
to the base 62. At this time, the protrusion 69 formed in the base
62 is pressed and bent by being pressed by the optical fiber cable.
Thus, in the state with the cover part 5 and the mounting part 3
coupled, the blades 65, 66 bite into the optical fiber cable, which
is also supported by the pressing part 36 and base 62. In the state
with the optical fiber cable being gripped, the support walls 63,
64 are more widely spread apart by the optical fiber cable than in
the case with the smaller diameter, but the optical fiber cable is
gripped along the entirety of the blades 65, 66. In the present
embodiment, the compression force required to install a
large-diameter optical fiber cable 101 is around 50 N.
Additionally, the drawing force required to pull the optical fiber
cable 101 in the lengthwise direction is around 40 N.
[0042] Next, the actions and effects of the cable gripping
structure and optical fiber connector 1 of the present embodiment
will be described.
[0043] For example, a cable gripping structure will be considered
in a comparative example in which the ends 65c, 66c of the blades
65, 66 extended to the edge 62a of the base 62, and were connected
to the edge 62a. In the cable gripping structure of such a
comparative example, if the dimension between blades 65, 66 were
set to match a small-diameter optical fiber cable, when a
large-diameter optical fiber cable is pressed between the blades
65, 66, it is necessary for the blades 65, 66 to substantially bite
into the optical fiber cable 101 and, as a result, the force
necessary to insert the optical fiber cable 101 between the blades
65, 66 increases. On the other hand, in a case in which the
dimension between the blades 65, 66 were set to match the
large-diameter optical fiber cable 101, so that the blades 65, 66
do not bite greatly into the optical fiber cable 101 and the cable
can be inserted with appropriate pressing force, sufficient
gripping strength for a small-diameter optical fiber cable 102 can
not be ensured.
[0044] In contrast, in the cable gripping structure 6 of the
present embodiment, the blades 65, 66 for gripping the optical
fiber cable 100 are set toward the tips 63a, 64a of the support
walls 63, 64, separated from the base ends (base 62) thereof
Therefore, even in a state in which the dimension between the
blades 65, 66 has been set to be able to sufficiently grip a
small-diameter optical fiber cable 102, the blades 65, 66 do not
have to bite greatly into the optical fiber cable 101 when a
large-diameter optical fiber cable is inserted, decreasing the
force needed to insert the optical fiber cable compared to a case
in which the blades are formed contiguously from the base. Thus,
this cable gripping structure 6 can adequately grip optical fiber
cables of multiple various diameters, improving operability.
[0045] The blades 65, 66 in the cable gripping structure 6 of the
present embodiment can grip both large-diameter optical fiber
cables 101 and small-diameter optical fiber cables 102, and the
length dimension of the blades 65, 66 is equal to or greater than
the dimension of the long side 102a in cross-section of the
small-diameter optical fiber cable 102 and less than the dimension
of the long side 101a in cross-section of the large-diameter
optical fiber cable 101. With this cable gripping structure 6,
since multiple various optical fiber cables of different outside
diameters can be gripped using the same size cable gripping
structure 6, the amount that the blades 65, 66 bite into a
large-diameter optical fiber cable 101 is greater than the amount
that the blades 65, 66 bite into a small-diameter optical fiber
cable 102. Since the small-diameter optical fiber cable 102 is
gripped along the entire direction of the long side 102 in
cross-section, there can be sufficient gripping force even though
the amount that the blades 65, 66 bite in is smaller. Meanwhile,
only a portion of the large-diameter optical fiber cable 101 is
gripped in the direction of the long side 101a in cross-section,
but adequate gripping is possible because the amount that the
blades 65, 66 bit in is greater.
[0046] In the cable gripping structure 6 of the present embodiment,
the pair of support walls 63, 64 possess thin parts 63d, 64d formed
with a smaller wall thickness toward the tips 63a, 64 end and thick
parts 63e, 64e formed with a larger wall thickness toward the base
ends of the support walls 63, 64. Since making the base ends of the
support walls 63, 64 from thick parts 63e, 64e makes the bearing
resistance from the support walls greater than when the entire
support wall is made thin, the gripping force from the blades 65,
66 can be increased. Thus, when inserting a small-diameter optical
fiber cable 102, the gripping force on the small-diameter optical
fiber cable 102 can be made even greater. Additionally, making the
tips 63a, 64a ends of the support walls 63, 64 as thin parts 63d,
64d keeps the pressing force needed in the compression operation
from getting too high compared with when the entire support wall is
thick.
[0047] In the cable gripping structure 6 of the present embodiment,
when external force is exerted on the support walls 63, 64, the
strain is likely to concentrate in the boundary parts 67a, 67b
between the thin parts 63d, 64d and the thick parts 63e, 64e,
making these areas more likely to deform that the other areas.
Forming such boundary parts 67a, 67b between the thin parts 63d,
64d and thick parts 63e, 64e in the area between the base of the
support wall 63, 64 and the blades 65, 66 makes the support walls
63, 64 more easily deformed, which makes it possible to decrease
the pressing force of large-diameter optical fiber cables 101.
[0048] The optical fiber connector 1 of the present embodiment is
equipped with a mounting part 3 in which the optical fiber cable
100 is mounted and a cover part 5 that couples with the mounting
part 3. The mounting part 3 is then constituted by at least one
surface of the back end portion of the base part 11 in the
connector body 2 being notched out, and the cover part 5 is
equipped with a cable gripping structure 6 and is disposed so as to
be rotatable relative to the mounting part 3, so as to cover the
mounting part 3. Therefore, when installing an optical fiber cable
100 in the optical fiber connector 1, the operator merely performs
an operation of rotating the cover part 5 with the optical fiber
cable 100 mounted in the mounting part 3. Thus, the optical fiber
cable 100 mounted in the mounting part is adequately gripped by the
cable gripping structure 6 formed in the cover part 5.
[0049] In the optical fiber connector 1 of the present embodiment,
a pressing part 36, which can press against an optical fiber cable,
is provided in the floor surface 35 of the mounting part 3 that
protrudes from the floor surface 35 and, in the state with the
cover part 5 covering the mounting part 3, is positioned between
the pair of support walls 63, 64. Therefore, in a state in which an
optical fiber cable 100 is mounted on the pressing part 36, when
the cover part 5 is coupled with the mounting part 3, the optical
fiber cable 100 is pushed between the support walls 63, 64 by the
pressing part 36. Thus, the optical fiber cable can be securely
pressed between the blades 65, 66 formed on the support walls 63,
64 by the amount that the pressing part 36 protrudes.
[0050] In the optical fiber connector 1 of the present embodiment,
a protrusion 69 is provided in the cover part 5, protruding between
the pair of support walls 63, 64 from the base toward the tip
thereof Thus, even in cases in which an optical fiber cable 102
does not reach the base part 62 when the cover part 5 and the
mounting part 3 are coupled, e.g., when installing a small-diameter
optical fiber cable 102, the protrusion 69 is in contact with the
optical fiber cable 102, thereby keeping the optical fiber cable
102 from shifting between the blades 65, 66 (between the support
walls 63, 64).
[0051] An embodiment of the present invention has been detailed
above, referring to the attached drawings, but the specific
constitution is not limited to this embodiment and modifications
may be made without departing from the scope of the present
invention.
[0052] For example, an example was shown in which the cable
gripping structure 6 is integrally formed in the cover part 5 of
the optical fiber connector 6, but this example is not limiting.
For example, the cable gripping structure may also be constituted
formed as a separate entity from the optical fiber connector.
[0053] An example was also shown in which through holes 57a formed
in the cover part 5 were coupled with shafts 37a formed on the
mounting part 3, but this example is not limiting. For example, the
mounting part and cover part may be constituted integrally formed,
with this coupling part as a thin hinge structure. In this case,
the cover part would be able to rotate relative to the mounting
part around the part constituting the thin hinge as the rotational
axis.
[0054] An example is also shown in which a large-diameter optical
fiber cable 101 and a small-diameter optical fiber cable 102 are
gripped by the cable gripping structure 6, but this example is not
limiting, and this can also be applied to three or more different
types of optical fiber cables of different outside diameters.
REFERENCE NUMERALS
[0055] 1 . . . optical fiber connector, 2 . . . connector body, 3 .
. . mounting part, 5 . . . cover part, 6 . . . cable gripping
structure. 35 . . . floor surface, 36 . . . pressing part, 62 . . .
base, 63, 64 . . . support walls, 63d, 64d . . . thin parts, 63e,
64e . . . thick parts, 65, 66 . . . blades, 67a, 67b . . . boundary
parts, 69 . . . protrusion, 100 . . . optical fiber cable, 101 . .
. optical fiber cable (first cable), 102 . . . optical fiber cable
(second cable).
* * * * *