U.S. patent application number 14/984407 was filed with the patent office on 2017-07-06 for beam splitter.
The applicant listed for this patent is ORANGETEK CORPORATION. Invention is credited to Chun-Chieh CHEN, Po-Chuan CHEN, Hsuan-Yi LI.
Application Number | 20170192214 14/984407 |
Document ID | / |
Family ID | 59226229 |
Filed Date | 2017-07-06 |
United States Patent
Application |
20170192214 |
Kind Code |
A1 |
CHEN; Po-Chuan ; et
al. |
July 6, 2017 |
BEAM SPLITTER
Abstract
A beam splitter contains: a body, a main reflection portion, a
sub reflection portion, and a refraction portion. The body includes
an inlet and an outlet. The main reflection portion is located on a
first side of the body, and the main reflection portion and the
outlet have a first rotating angle and a second rotating angle
respectively so that the main reflection portion reflects an
external beam to produce a main beam. The sub reflection portion is
located on the first side of the body, and the sub reflection
portion reflects the external beam to produce a sub beam. The
refraction portion is located on a second side of the body and has
a third rotating angle different from the inlet, the sub beam
projects out of the refraction portion to produce a deflective
projection angle of the sub beam.
Inventors: |
CHEN; Po-Chuan; (Changhua
County, TW) ; CHEN; Chun-Chieh; (Changhua County,
TW) ; LI; Hsuan-Yi; (Changhua County, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ORANGETEK CORPORATION |
Changhua County |
|
TW |
|
|
Family ID: |
59226229 |
Appl. No.: |
14/984407 |
Filed: |
December 30, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B 6/4208 20130101;
G02B 6/4286 20130101; G02B 27/108 20130101; G02B 27/143 20130101;
G02B 6/4214 20130101 |
International
Class: |
G02B 17/08 20060101
G02B017/08; G02B 6/32 20060101 G02B006/32; G02B 6/42 20060101
G02B006/42 |
Claims
1. A beam splitter comprising: a body including an inlet and an
outlet, the inlet being configured to receive external beam; a main
reflection portion located on a first side of the body, and the
main reflection portion and the outlet having a first rotating
angle and a second rotating angle respectively so that the main
reflection portion reflects the external beam to produce a main
beam; a sub reflection portion located on the first side of the
body adjacent to the main reflection portion, an angle being
defined between the sub reflection portion and the main reflection
portion, and the sub reflection portion reflecting the external
beam to produce a sub beam; a refraction portion located on a
second side of the body proximate to the inlet and having a third
rotating angle different from the inlet, the sub beam projecting
out of the refraction portion so as to produce a deflective
projection angle of the sub beam, and further having a refractive
index different from that of air so as to change the deflective
projection angle of the sub beam.
2. The beam splitter as claimed in claim 1 further comprising a
monitor photo diode located outside the body proximate to the light
emitting element and corresponding to the second side of the body,
wherein the monitor photo diode is configured to detect an
intensity of the sub beam.
3. The beam splitter as claimed in claim 2, wherein a location of
the monitor photo diode is adjusted based on the sub beam through
the refraction portion and a setting location of the sub reflection
portion.
4. The beam splitter as claimed in claim 1 further comprising a
first collimating lens arranged on the inlet so as to collimate the
external beam.
5. The beam splitter as claimed in claim 1 further comprising a
second collimating lens arranged on the outlet so as to collimate
the main beam.
6. The beam splitter as claimed in claim 1, wherein at least one of
the main reflection portion and the sub reflection is a mirror.
7. The beam splitter as claimed in claim 1, wherein at least one of
the main reflection portion and the sub reflection is a reflecting
film formed on the first side of the body.
8. The beam splitter as claimed in claim 7, wherein the reflecting
film is made of metal.
9. The beam splitter as claimed in claim 1, wherein the main
reflection portion has a main antireflection film formed on the
first side of the body, and the sub reflection portion has a sub
antireflection film formed on the first side of the body and its
refractive index is different from the body.
10. The beam splitter as claimed in claim 1, wherein the refraction
portion is a lens and its refractive indexes is different from that
of air.
11. The beam splitter as claimed in claim 10, wherein the
refractive index of the refraction portion is more than that of
air.
12. The beam splitter as claimed in claim 1, wherein the first
rotating angle is between 35 to 50 degrees, and more preferably, is
45 degrees.
13. The beam splitter as claimed in claim 1, wherein the second
rotating angle is between 135 to 170 degrees.
14. The beam splitter as claimed in claim 1, wherein the refractive
index of the refraction portion is more than the refraction index
of air.
15. The beam splitter as claimed in claim 1, wherein the refraction
portion is selected from a group consisting of a lens and a
transparent substrate of various refractive indexes, or a
combination thereof.
16. The beam splitter as claimed in claim 15, wherein the
refraction portion is a lens.
17. The beam splitter as claimed in claim 1, wherein the refraction
portion is made of a material that changes beam projection angle.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to an optical element, and
more particularly to a beam splitter which changes beam projection
angle.
BACKGROUND OF THE INVENTION
[0002] A conventional beam splitter is configured to transmit
signals quickly in an optical transmission manner, but during
optical transmission, it is necessary to convert electrical signals
into optical signals through a light emitting element and a monitor
photo diode (MPD), thus monitoring light emitting state and
adjusting luminescence of the light emitting element.
[0003] The conventional beam splitter contains a plurality of
reflecting lens configured to split external beam to two sub beams
of different paths from the light emitting element, and one of the
two sub beams is collimated by collimating lens and projects on the
monitor photo diode.
[0004] However, as splitting the external beam by using the
plurality of reflecting lens, the light emitting element has to
keep a distance from the monitor photo diode so that the plurality
of reflecting lens refract the two sub beams, and the two sub beams
project to the monitor photo diode, so the beam splitter cannot be
miniaturized. Furthermore, it is troublesome to assemble the
plurality of reflecting lens.
[0005] The present invention has arisen to mitigate and/or obviate
the afore-described disadvantages.
SUMMARY OF THE INVENTION
[0006] The primary objective of the present invention is to provide
a beam splitter which changes path of split beam so as to adjust a
distance between a monitor photo diode (MPD) and a light emitting
element and to miniaturize the beam splitter.
[0007] To obtain the above objective, a beam splitter provided by
the present invention contains: a body, a main reflection portion,
a sub reflection portion, and a refraction portion.
[0008] The body includes an inlet and an outlet, the inlet is
configured to receive external beam.
[0009] The main reflection portion is located on a first side of
the body, and the main reflection portion and the outlet have a
first rotating angle and a second rotating angle respectively so
that the main reflection portion reflects the external beam to
produce a main beam.
[0010] The sub reflection portion is located on the first side of
the body adjacent to the main reflection portion, and between the
sub reflection portion and the main reflection portion defines an
angle, the sub reflection portion reflects the external beam to
produce a sub beam.
[0011] The refraction portion is located on a second side of the
body proximate to the inlet and has a third rotating angle
different from the inlet, the sub beam projects out of the
refraction portion so as to produce a deflective projection angle
of the sub beam.
[0012] In one embodiment, the beam splitter further contains a
monitor photo diode located outside the body proximate to the light
emitting element and corresponding to the second side of the body,
wherein the monitor photo diode is configured to detect an
intensity of the sub beam.
[0013] In one embodiment, a location of the monitor photo diode is
adjusted based on the sub beam through the refraction portion and a
setting location of the sub reflection portion.
[0014] In one embodiment, the beam splitter further contains a
first collimating lens arranged on the inlet so as to collimate the
external beam.
[0015] In one embodiment, the beam splitter further contains a
second collimating lens arranged on the outlet so as to collimate
the main beam.
[0016] In one embodiment, the at least one of the main reflection
portion and the sub reflection is a mirror.
[0017] In one embodiment, the at least one of the main reflection
portion and the sub reflection is a reflecting film formed on the
first side of the body.
[0018] In one embodiment, the reflecting film is made of metal.
[0019] In one embodiment, the main reflection portion has a main
antireflection film formed on the first side of the body, and the
sub reflection portion has a sub antireflection film formed on the
first side of the body and its refractive index is different from
the body.
[0020] In one embodiment, the refraction portion is a lens and its
refractive indexes is different from that of air.
[0021] In one embodiment, the refractive index of the refraction
portion is more than that of air.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1 is a side plan view showing the assembly of a beam
splitter according to a first embodiment of the present
invention.
[0023] FIG. 2 is a side plan view showing the operation of the beam
splitter according to the first embodiment of the present
invention.
[0024] FIG. 3 is a perspective view showing the assembly of a part
of a beam splitter according to a second embodiment of the present
invention.
[0025] FIG. 4 is a perspective view showing the assembly of a part
of a beam splitter according to a third embodiment of the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0026] As shown in FIGS. 1 and 2, a beam splitter 1 according to a
first embodiment of the present invention comprises: a body 11, a
main reflection portion 15, a sub reflection portion 16, and a
refraction portion 14.
[0027] The body 11 includes an inlet 12 configured to receive an
external beam and an outlet 13, the inlet 12 is located on a first
side of the body 11 and includes a first collimating lens 121
arranged thereon to collimate the external beam. The outlet 13
includes a second collimating lens 131 arranged thereon to
collimate the external beams through the outlet 13. The main
reflection portion 15 is located on a second side of the body 11,
and the main reflection portion 15 and the outlet 13 have a first
rotating angle and a second rotating angle respectively so that
between the main reflection portion 15 and the external beam
defines a first angle, wherein the first angle is within 35 degrees
to 50 degrees. Preferably, the first angle is 45 degrees. The main
reflection portion 15 is a mirror, such as a completely reflecting
mirror, so as to reflect the external beam to produce a main beam
151. The sub reflection portion 16 is located on the second side of
the body 11 adjacent to the main reflection portion 15, and between
the sub reflection portion 16 and the main reflection portion 15
defines a second angle .theta., wherein the second angle .theta. is
within 135 degrees to 170 degrees, and the sub reflection portion
16 is a mirror, such as a completely reflecting mirror, so as to
reflect the external beam to produce a sub beam 161.
[0028] The refraction portion 14 is located on the first side of
the body 11 proximate to the inlet 12 and has a third rotating
angle different from the inlet 12. A refractive index of the
refraction portion 14 is different from that of air so as to change
a deflective projection angle of the sub beam 16. The refraction
portion 14 is a combination of a lens, a first film, a transparent
substrate, and a second film of various refractive indexes or is
made of specific material which changes beam projection angle.
[0029] A light emitting element 21 corresponds to the inlet 12 of
the body 11 and is any one of a laser diode, a light emitting diode
(LED), a vertical-cavity surface-emitting laser (VCSEL), and other
similar light source.
[0030] The monitor photo diode 31 is located outside the body 11
proximate to the light emitting element 21 and corresponds to the
first side of the body 11, a distance between the monitor photo
diode 31 and the light emitting element 21 determines based on a
fourth rotating angle of the sub reflection portion 16 or/and the
refractive index of the refraction portion 14, wherein the monitor
photo diode 31 detects an intensity of the sub beam 161 and
receives the sub beam 161 through the outlet 13 so as to adjust
beam intensity of the light emitting element 21.
[0031] An optical fiber 41 is located outside the body 11 and
corresponds to the outlet 13 so as to receive the main beam 15
through the outlet 13 and transmits the main beam 151.
[0032] Preferably, a plurality of beam splitters are configured in
a linear arrangement or an array arrangement so as to form a light
splitting module.
[0033] After the light emitting element 21 receives electronic
signals, the electronic signals are converted into a transmitted
beam 211, and the transmitted beam 211 is collimated by the first
collimating lens 121, transmits through the inlet 12, and projects
on the main reflection portion 15 and the sub reflection portion 16
so as to form the main beam 151 and the sub beam 161, respectively.
The main beam 151 enters into the optional fiber 41 via the outlet
13 and the first collimating lens 121, and the sub reflection
portion 16 reflects the transmitted beam 211 to produce the sub
beam 161, the sub beam 161 projects out of the refraction portion
14. In the meantime, the deflective projection angle of the sub
beam 161 changes because the refractive index of the refraction
portion 14 is different from that of air.
[0034] When the refractive index of the refraction portion 14 is
more than that of air, the deflective projection angle of the sub
beam 161 changes so that the sub beam 161 is close to the light
emitting element 21, and the distance between the monitor photo
diode 31 and the light emitting element 21 decreases, thus
miniaturizing the beam splitter 1.
[0035] Referring to FIG. 3, a beam splitter 1 of a second
embodiment from that of the first embodiment comprises: a main
reflecting film 152 formed on a main reflection portion 15' of a
second side of a body 11, wherein the main reflecting film 152 is
made of any one of gold, silver, and copper in a vacuum sputtering
manner. In addition, a sub reflecting film 162 is formed on a sub
reflection portion 16' of the second side of the body 11, wherein
the sub reflecting film 162 is made of any one of gold, silver, and
copper in a vacuum sputtering manner.
[0036] As illustrated in FIG. 4, a beam splitter 1 of a third
embodiment from that of the first embodiment comprises: a main
antireflection film 152' formed on a main reflection portion 15''
of a second side of a body 11, wherein the main antireflection film
152' is made in a sputtering manner and its refractive index is
different from the body 11. In addition, a sub antireflection film
162 is formed on a sub reflection portion 16'' of the second side
of the body 11, wherein the sub antireflection film 162' is made in
a sputtering manner and its refractive index is different from the
body 11.
[0037] While the preferred embodiments of the invention have been
set forth for the purpose of disclosure, modifications of the
disclosed embodiments of the invention as well as other embodiments
thereof may occur to those skilled in the art. Accordingly, the
appended claims are intended to cover all embodiments which do not
depart from the spirit and scope of the invention.
* * * * *