U.S. patent application number 15/628534 was filed with the patent office on 2018-12-20 for power saving welding helmet.
The applicant listed for this patent is ARCMASK OPTECH CO., LTD. Invention is credited to Chia-Hung Chen, Chien-Hsing Hsieh, Edward Martin, Jim Watkins.
Application Number | 20180360663 15/628534 |
Document ID | / |
Family ID | 64656507 |
Filed Date | 2018-12-20 |
United States Patent
Application |
20180360663 |
Kind Code |
A1 |
Hsieh; Chien-Hsing ; et
al. |
December 20, 2018 |
POWER SAVING WELDING HELMET
Abstract
A power saving welding helmet includes a helmet shell and a lens
device. The helmet shell includes a mounting hole to contain the
lens device. The lens device has an inner surface and an outer
surface, and includes a magnetic sensor, a filter control unit, and
a filter lens. The control logic module controls the filter lens
according to magnetic signals generated by the magnetic sensor. The
filter lens includes a first LCD panel and a second LCD panel
respectively controlled by different control signals. Therefore, a
refresh time of the first LCD panel and a refresh time of the
second LCD panel do not synchronize. A welder does not feel the
first LCD panel or the second LCD panel flashing, and the welding
experiences this as consistent darkness.
Inventors: |
Hsieh; Chien-Hsing; (Taoyuan
City, TW) ; Martin; Edward; (Tanuton, MA) ;
Chen; Chia-Hung; (Taoyuan City, TW) ; Watkins;
Jim; (Tanuton, MA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
ARCMASK OPTECH CO., LTD |
Taoyuan City |
|
TW |
|
|
Family ID: |
64656507 |
Appl. No.: |
15/628534 |
Filed: |
June 20, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02F 1/13471 20130101;
G01J 1/02 20130101; A61F 2/14 20130101; G02F 1/133 20130101; A61F
9/067 20130101; G02F 1/13306 20130101; G01J 2001/0276 20130101;
A61F 9/00 20130101; G01J 1/18 20130101; G01J 1/04 20130101 |
International
Class: |
A61F 9/06 20060101
A61F009/06; A61F 2/14 20060101 A61F002/14; G01J 1/02 20060101
G01J001/02; G01J 1/04 20060101 G01J001/04; G01J 1/18 20060101
G01J001/18; G02F 1/133 20060101 G02F001/133 |
Claims
1. A power saving welding helmet, comprising: a helmet shell,
comprising a mounting hole; and a lens device, mounted in the
mounting hole of the helmet shell; wherein the lens device
comprises: an inner surface; an outer surface; a magnetic sensor,
mounted on the outer surface, and generating magnetic signals; a
filter control unit, electrically connected to the magnetic sensor
to receive the magnetic signals; wherein the filter control unit
comprises: a control logic module, electrically connected to the
magnetic sensor to receive the magnetic signals; wherein the
control logic module determines whether to generate and output
control signals according to the magnetic signals; a phase shift
module, electrically connected to the control logic module; and a
battery, electrically connected to and supplying the electric power
to the control logic module, and the magnetic sensor; a filter
lens, being a viewing lens, and comprising: a first liquid crystal
display (LCD) panel, electrically connected to the control logic
module through the phase shift module to receive the control
signals shifted by the phase shift module; and a second LCD panel,
stacked with the first LCD panel, and directly electrically
connected to the control logic module to receive the control
signals generated by the control logic module; wherein when the
first LCD panel receives the control signals shifted by the phase
shift module, light transmittance of the first LCD panel is
lowered; wherein when the second LCD panel receives the control
signals, light transmittance of the second LCD panel is lowered;
wherein when the first LCD panel does not receive the control
signals shifted by the phase shift module, the first LCD panel is
transparent; wherein when the second LCD panel does not receive the
control signals, the second LCD panel is transparent.
2. The power saving welding helmet as claimed in claim 1, wherein a
frequency of the control signals is lower than 1 Hz.
3. The power saving welding helmet as claimed in claim 1, wherein:
an area of the first LCD panel is greater than 85 square
centimeters; an area of the second LCD panel is greater than 85
square centimeters.
4. The power saving welding helmet as claimed in claim 1, wherein
the control signals are square wave signals.
5. The power saving welding helmet as claimed in claim 1, wherein
the first LCD panel and the second LCD panel are integrated into
one component.
6. The power saving welding helmet as claimed in claim 1, wherein
the lens device further comprises: a solar panel, mounted on the
outer surface, and generating electric power; a light sensor,
mounted on the outer surface, and generating light signals; wherein
the battery is electrically connected to the solar panel to receive
and store the electric power, and further electrically connected to
and supplying the electric power to the light sensor; wherein the
filter control unit is further electrically connected to the solar
panel, and the light sensor to receive the electric power, and the
light signals; wherein the control logic module is further
electrically connected to the light sensor; wherein when the
control logic module receives the light signals, the control logic
module determines whether to turn on the magnetic sensor according
to the light signals; and wherein when the magnetic sensor is
turned on, the control logic module receives the magnetic signals;
wherein the control signals generated by the control logic module
are DC control signals; wherein the filter control unit further
comprises: a DC to AC module, electrically connected to the control
logic module to receive the DC control signals; wherein the control
logic module is electrically connected to the phase shift module
through the DC to AC module, and is electrically connected to the
first LCD panel through the DC to AC module; wherein when the DC to
AC module receives the DC control signals, the DC to AC module
generates AC control signals according to the DC control signals;
wherein the first LCD panel is electrically connected to the DC to
AC module through the phase shift module to receive the AC control
signals shifted by the phase shift module; wherein the second LCD
panel is electrically connected to the DC to AC module to receive
the AC control signals generated by the DC to AC module.
7. The power saving welding helmet as claimed in claim 6, wherein:
the light sensor senses ambient light to generate and transmit
light signals to the filter control unit; when the control logic
module determines signal strength of the light signals is greater
than a light threshold, the control logic module determines to turn
on the magnetic sensor.
8. The power saving welding helmet as claimed in claim 6, wherein
the filter control unit further comprises a regulating module;
wherein the lens device further comprises: a delay time select
switch, mounted on the inner surface of the lens device, and
electrically connected to the filter control unit; wherein the
delay time select switch generates and transmits delay time signals
to the control logic module through the regulating module; and a
shade select unit, mounted on the inner surface of the lens device,
and electrically connected to the filter control unit; wherein the
shade select unit generates and transmits shade signals to the
control logic module through the regulating module.
9. The power saving welding helmet as claimed in claim 8, wherein
the delay time select switch is a button.
10. The power saving welding helmet as claimed in claim 8, wherein
the shade select unit is a potentiometer.
11. The power saving welding helmet as claimed in claim 5, wherein:
when the magnetic sensor is turned on, the control logic module
further determines a light transmittance value of the first LCD
panel and the second LCD panel according to the shade signals, and
generates the DC control signals combined with the light
transmittance value; when the control logic module determines
whether to generate and output the DC control signals to the DC to
AC module according to the magnetic signals, the control logic
module further receives the delay time signals and the shade
signals; when the control logic module determines to generate the
DC control signals, the DC control signals are generated according
to the magnetic signals and the shade signals; when the control
logic module generates and outputs the DC control signals to the DC
to AC module, the DC to AC module generates the AC control signals
combined with the light transmittance value; the filter control
unit controls the light transmittance of the first LCD panel and
the light transmittance of the second LCD panel according to the
light transmittance value from the shade signals; when the first
LCD panel and the second LCD panel become dark, the control logic
module further determines whether to continuously generate the DC
control signals according to the magnetic signals; when the control
logic module determines to continuously generate the DC control
signals according to the magnetic signals, the first LCD panel and
the second LCD panel continuously receive the AC control signals
and keep darkened according to the light transmittance value; when
the control logic module determines not to continuously generate
the DC control signals according to the magnetic signals, the
control logic module keeps generating the DC control signals, and
stops generating the DC control signals upon expiration of the
delay time corresponding to the delay time signals.
12. The power saving welding helmet as claimed in claim 11, wherein
when the control logic module determines signal strength of the
magnetic signals is greater than a magnetic threshold, the control
logic module continuously generates the DC control signals.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] The present invention relates to a welding helmet, and
particularly to a welding helmet having a function of automatically
adjusting light transmittance.
2. Description of the Related Art
[0002] A welder may wear a welding helmet when working. The welding
helmet may protect the eyes, face, and neck of the welder from
flash burn, ultraviolet light, sparks, infrared light, and
heat.
[0003] A conventional welding helmet may have a dark lens, and the
welder may clearly see a welding position through the dark lens.
However, when the welder is not working, the welder may not clearly
see the surroundings through the dark lens. Hence, the welder may
take off the welding helmet from a position in front of the eyes to
clearly see the surroundings.
[0004] Another conventional welding helmet may have a function of
automatically adjusting light transmittance. The welding helmet may
automatically change light transmittance of a viewing lens.
Therefore, when a welder is not working, the welder does not have
to take off the welding helmet and may still clearly see the
surroundings through the viewing lens with higher light
transmittance.
[0005] However, since the viewing lens is controlled by alternating
current (AC) signals and a voltage level of the AC signals may be
changed with time, the viewing lens may flash when the voltage
level of the alternation current signals is changed. An occurrence
frequency of flashes of the viewing lens may correspond to a
frequency of the AC signals. Therefore, the frequency of the AC
signals may be higher enough to cause persistence of vision. When
the frequency of the AC signals is higher, power consumption of the
conventional viewing lens may be greater. Therefore, battery of the
conventional viewing lens may need to be replaced frequently.
Thereby, it is making the welding helmet inconvenient and costly to
the welder to use the welding helmet.
SUMMARY OF THE INVENTION
[0006] An objective of the present invention is to provide a power
saving welding helmet. The power saving welding helmet may reduce
power consumption to save more electric power.
[0007] To achieve the foregoing objective, the power saving welding
helmet includes a helmet shell and a lens device. The helmet shell
includes a mounting hole. The lens device is mounted in the
mounting hole of the helmet shell.
[0008] The lens device has an inner surface and an outer surface,
and includes a magnetic sensor, a filter control unit, and a filter
lens.
[0009] The filter control unit is electrically connected to the
magnetic sensor, and the filter lens. The magnetic sensor is
mounted on the outer surface of the lens device, and generates and
transmits magnetic signals to the filter control unit.
[0010] The filter control unit includes a battery, a control logic
module, and a phase shift module. The battery is electrically
connected to and supplies the electric power to the control logic
module, and the magnetic sensor.
[0011] The control logic module receives the magnetic signals, and
determines whether to generate and output control signals according
to the magnetic signals.
[0012] The filter lens is a viewing lens. The filter lens includes
a first liquid crystal display (LCD) panel and a second LCD panel.
The first LCD panel is electrically connected to the control logic
module through the phase shift module to receive the control
signals shifted by the phase shift module. The second LCD panel is
directly electrically connected to the control logic module to
receive the control signals generated by the control logic module.
The first LCD panel and the second LCD panel are stacked with each
other.
[0013] When the first LCD panel receives the AC control signals
shifted by the phase shift module, the light transmittance of the
first LCD panel may be lowered, such that the first LCD panel is
darkened. When the first LCD panel does not receive the AC control
signals, the first LCD panel may be transparent.
[0014] When the second LCD panel receives the AC control signals,
the light transmittance of the second LCD panel may be lowered,
such that the second LCD panel is darkened. When the second LCD
panel does not receive the AC control signals, the second LCD panel
may be transparent.
[0015] In one embodiment of the power saving welding helmet,
frequency of the AC control signals may be lower than 1 Hz. An area
of the first LCD panel is greater than 85 square centimeters, and
an area of the second LCD panel is greater than 85 square
centimeters.
[0016] When a welder is not working, the welding arc is not active.
The light sensor may not sense the welding arc to generate the
light signals, and the filter control unit may not turn on the
magnetic sensor. Therefore, the first LCD panel and the second LCD
panel may not receive the control signals, and the first LCD panel
and the second LCD panel may not be darkened. The welder does not
have to take off the power saving welding helmet, and may still
clearly see the surroundings through the filter lens.
[0017] When a welder is working, the welding arc is active. The
light sensor may sense the welding arc to generate the light
signals, and the control logic module may output the control
signals. The first LCD panel and the second LCD panel may receive
the control signals, and the first LCD panel and the second LCD
panel may be darkened to protect eyes of the welder.
[0018] Further, the first LCD panel and the second LCD panel are
controlled by the control signals. Therefore, the first LCD panel
is controlled by the control signals with a phase shift and the
second LCD panel is controlled by the control signals without the
phase shift. Therefore, performances of the first LCD panel and the
second LCD panel are complementary to each other. A refresh time of
the first LCD panel and a refresh time of the second LCD panel do
not synchronize. In the other words, when the first LCD panel is
transparent, the second LCD panel is darkened, and vice versa.
Therefore, the welder may not feel the first LCD panel or the
second LCD panel flashing, and the welding experiences this as
consistent darkness.
[0019] Since the lens device includes two LCD lenses controlled by
different control signals, and the control signals of the first LCD
panel and the control signals of the second LCD panel are not
synchronized, frequency of the control signals may not be high
enough to cause persistence of vision. The frequency of the control
signals may be decreased. Therefore, power consumption caused by
the control signals may also be decreased, and the power saving
welding helmet may save more electric power.
[0020] Other objectives, advantages and novel features of the
invention will become more apparent from the following detailed
description when taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 is a schematic view of a power saving welding helmet
of the present invention;
[0022] FIG. 2 is a schematic view of a lens device of the power
saving welding helmet of FIG. 1;
[0023] FIG. 3 is an enlarged view of the schematic diagram of the
lens device of the power saving welding helmet of FIG. 2;
[0024] FIG. 4 is another schematic view of the lens device of the
power saving welding helmet of FIG. 1;
[0025] FIG. 5 is block diagram of the lens device of the power
saving welding helmet of FIG. 1;
[0026] FIG. 6 is anther block diagram of the lens device of the
power saving welding helmet of FIG. 1;
[0027] FIG. 7 is a circuit diagram of an embodiment for controlling
the lens device of the power saving welding helmet of FIG. 1;
[0028] FIG. 8 is a flowchart of the lens device of the power saving
welding helmet of an embodiment of the present invention;
[0029] FIG. 9A and FIG. 9B are waveform diagrams of controlling
signals of the lens device of the power saving welding helmet of
FIG. 1; and
[0030] FIG. 10 is a schematic view of a first LCD panel and a
second LCD panel of the lens device of the power saving welding
helmet of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
[0031] With reference to FIG. 1, the present disclosure is a power
saving welding helmet 1. The power saving welding helmet 1 may
reduce power consumption to save more electric power.
[0032] The power saving welding helmet 1 includes a helmet shell 10
and a lens device 20. The helmet shell 10 includes a mounting hole
11. The lens device 20 is mounted in the mounting hole 11 of the
helmet shell 10.
[0033] With reference to FIGS. 2 and 3, the lens device 20 has an
inner surface 201 and an outer surface 202, and alternatively
includes a solar panel 21, and a light sensor 22. The lens device
20 further includes a magnetic sensor 23, a filter control unit 24,
and a filter lens 25.
[0034] With reference to FIG. 5, in one embodiment, the lens device
20 may not include the solar panel 21, and the light sensor 22, but
may include the magnetic sensor 23, the filter control unit 24, and
the filter lens 25. The filter control unit 24 is electrically
connected to the magnetic sensor 23, and the filter lens 25. The
magnetic sensor 23 is mounted on the outer surface 202 of the lens
device 20, and generates and transmits magnetic signals to the
filter control unit 24.
[0035] The filter control unit 24 includes a battery 241, a control
logic module 242, and a phase shift module 244. The battery 241 is
electrically connected to and supplies the electric power to the
control logic module 242, and the magnetic sensor 23.
[0036] The control logic module 242 receives the magnetic signals,
and determines whether to generate and output control signals
according to the magnetic signals.
[0037] The filter lens 25 is a viewing lens. The filter lens 25
includes a first liquid crystal display (LCD) panel 251 and a
second LCD panel 252. The first LCD panel 251 is electrically
connected to the control logic module 242 through the phase shift
module 244 to receive the control signals shifted by the phase
shift module 244. The second LCD panel 252 is directly electrically
connected to the control logic module 242 to receive the control
signals generated by the control logic module 242. The first LCD
panel 251 and the second LCD panel 252 are stacked with each
other.
[0038] When the first LCD panel 251 receives the control signals
shifted by the phase shift module 244, the light transmittance of
the first LCD panel 251 may be lowered, such that the first LCD
panel 251 is darkened. When the first LCD panel 251 does not
receive the control signals, the first LCD panel 251 may be
transparent.
[0039] When the second LCD panel 252 receives the control signals,
the light transmittance of the second LCD panel 252 may be lowered,
such that the second LCD panel 252 is darkened. When the second LCD
panel 252 does not receive the control signals, the second LCD
panel 252 may be transparent.
[0040] In this embodiment, frequency of the control signals may be
lower than 1 Hz. An area of the first LCD panel 251 is greater than
85 square centimeters, and an area of the second LCD panel 252 is
greater than 85 square centimeters.
[0041] With reference to FIGS. 6 and 7, in another embodiment, the
lens device 20 may include the solar panel 21, the light sensor 22,
the magnetic sensor 23, the filter control unit 24, and the filter
lens 25. The filter control unit 24 further includes a DC to AC
module 243. The battery 241 is further electrically connected to
the solar panel 21 to receive and store the electric power, and the
battery 241 is electrically connected to and supplies the electric
power to the light sensor 22. The solar panel 21 is mounted on the
outer surface 202, generates electric power, and transmits the
electric power to the filter control unit 24. The light sensor 22
is mounted on the outer surface 202 of the lens device 20, and
senses ambient light to generate and transmit light signals to the
filter control unit 24.
[0042] As shown in FIG. 8, a flow chart of an embodiment is
disclosed. In step S801, the control logic module 242 is
electrically connected to the light sensor 22 to receive the light
signals.
[0043] In step S802, when the control logic module 242 receives the
light signals, the control logic module 242 determines whether to
turn on the magnetic sensor 23 according to the light signals. In
one embodiment, when the control logic module 242 determines signal
strength of the light signals is greater than a light threshold,
the control logic module 242 turns on the magnetic sensor 23.
[0044] In step S803, when the magnetic sensor 23 is turned on, the
control logic module 242 receives the magnetic signals.
[0045] In step S804, the control logic module 242 determines
whether to generate and output DC control signals to the DC to AC
module 243 according to the magnetic signals.
[0046] In step S805, when the control logic module 242 generates
and outputs the DC control signals to the DC to AC module 243, the
DC to AC module 243 receives the DC control signals and generates
AC control signals according to the DC control signals.
[0047] The filter lens 25 is a viewing lens. The filter lens 25
includes a first liquid crystal display (LCD) panel 251 and a
second LCD panel 252. The first LCD panel 251 is electrically
connected to the DC to AC module 243 through the phase shift module
244 to receive the AC control signals shifted by the phase shift
module 244. The second LCD panel 252 is directly electrically
connected to the DC to AC module 243 to receive the AC control
signals generated by the DC to AC module 243. In one embodiment,
the first LCD panel 251 and the second LCD panel 252 are stacked
with each other.
[0048] In step S806, when the first LCD panel 251 receives the AC
control signals shifted by the phase shift module 244, light
transmittance of the first LCD panel 251 may be lowered, such that
the first LCD panel 251 is darkened. When the second LCD panel 252
receives the AC control signals, light transmittance of the second
LCD panel 252 may be lowered, such that the second LCD panel 252 is
darkened.
[0049] Otherwise, when the first LCD panel 251 does not receive the
AC control signals, the first LCD panel 251 may be transparent.
When the second LCD panel 252 does not receive the AC control
signals, the second LCD panel 252 may be transparent.
[0050] For example, when a welder is not working, the welding arc
is not active. The light sensor 22 may not sense the welding arc to
generate the light signals, and the filter control unit 24 may not
turn on the magnetic sensor 23. Therefore, the first LCD panel 251
and the second LCD panel 252 may not receive the AC control
signals, and the first LCD panel 251 and the second LCD panel 252
may not be darkened. The welder does not have to take off the power
saving welding helmet and may still clearly see the surroundings
through the filter lens 25.
[0051] When the welder is working, the welding arc is active. The
light sensor 22 may sense the welding arc to generate the light
signals, and the filter control unit 24 may turn on the magnetic
sensor 23. When the magnetic sensor 23 is turned on, the control
logic module 242 may generate and output the DC control signals to
the DC to AC module 243. The DC to AC module 243 may generate the
AC control signals. The first LCD panel 251 and the second LCD
panel 252 may receive the AC control signals, and the first LCD
panel 251 and the second LCD panel 252 may be darkened to protect
eyes of the welder.
[0052] Further, the first LCD panel 251 and the second LCD panel
252 are controlled by the AC control signals respectively.
Therefore, the first LCD panel 251 is controlled by the AC control
signals with a phase shift and the second LCD panel 252 is
controlled by the AC control signals without the phase shift.
Therefore, performances of the first LCD panel 251 and the second
LCD panel 252 are complementary to each other. A refresh time of
the first LCD panel 251 and a refresh time of the second LCD panel
252 do not synchronize. In other words, when the first LCD panel
251 is transparent, the second LCD panel 252 is darkened, and vice
versa. Therefore, the welder may not feel the first LCD panel 251
or the second LCD panel 252 flashing.
[0053] Since the lens device includes two LCD lenses controlled by
different control signals, the control signals of the first LCD
panel 251 and the control signals of the second LCD panel 252 are
not synchronized, and frequency of the control signals may not be
high enough to cause persistence of vision. The frequency of the
control signals may be decreased. Therefore, power consumption
caused by the control signals may also be decreased, and the power
saving welding helmet may save more electric power.
[0054] With reference to FIGS. 4, 6, and 7, the filter control unit
24 further includes a regulating module 245. The lens device 20
further includes a delay time select switch 26 and a shade select
unit 27. The delay time select switch 26 and the shade select unit
27 are mounted on the inner surface 201 of the lens device 20. The
delay time select switch 26 and the shade select unit 27 are
electrically connected to the filter control unit 24.
[0055] The delay time select switch 26 may generate and transmit
delay time signals to the control logic module 242 through the
regulating module 245. The shade select unit 27 may generate and
transmit shade signals to the control logic module 242 through the
regulating module 245.
[0056] The delay time signals may be adjusted by a user through
operating the delay time select switch 26. The shade signals may be
adjusted by the user through operating the shade select unit 27. In
an embodiment, the delay time select switch 26 may be a button. The
shade select unit 27 may be a potentiometer. The delay time signals
may correspond to a delay time period.
[0057] In one embodiment, the light sensor 22 may be electrically
connected to the control logic module 242 though an amplifier 246,
and the magnetic sensor 23 may be electrically connected to the
control logic module 242 through another amplifier 246.
[0058] As shown in FIG. 8, in step S803, when the magnetic sensor
23 is turned on, the control logic module 242 receives the magnetic
signals, the delay time signals, and the shade signals, and further
determines a light transmittance value of the first LCD panel 251
and the second LCD panel 252 according to the shade signals, and
generates the DC control signals combined with the light
transmittance value.
[0059] In step S804, when the control logic module 242 determines
whether to generate and output DC control signals to the DC to AC
module 243 according to the magnetic signals, the control logic
module 242 may further receive the delay time signals and the shade
signals.
[0060] In step S805, when the control logic module 242 determines
to generate the DC control signals, the DC control signals may be
generated according to the magnetic signals and the shade signals.
Further, when the control logic module 242 generates and outputs
the DC control signals to the DC to AC module 243, the DC to AC
module 243 generates the AC control signals combined with the light
transmittance value.
[0061] In step S806, the filter control unit 24 may control the
light transmittance of the first LCD panel 251 and the second LCD
panel 252 according to the light transmittance value from the shade
signals. Namely, when the first LCD panel 251 receives the AC
control signals shifted by the phase shift module 244, the first
LCD panel 251 may be darkened according to the light transmittance
value combined in the AC control signals. When the second LCD panel
252 receives the AC control signals, the second LCD panel 252 may
be darkened according to the light transmittance value combined in
the AC control signals.
[0062] In step S807, when the first LCD panel 251 and the second
LCD panel 252 become dark, the control logic module 242 further
determines whether to continuously generate the DC control signals
according to the magnetic signals. In one embodiment, when the
control logic module 242 determines signal strength of the magnetic
signals is greater than a magnetic threshold, the control logic
module 242 continuously generates the DC control signals.
[0063] In step S808, when the control logic module 242 determines
to continuously generate the DC control signals according to the
magnetic signals, the first LCD panel 251 and the second LCD panel
252 may continuously receive the AC control signals and keep
darkened according to the light transmittance value.
[0064] In step S809, when the control logic module 242 determines
not to continuously generate the DC control signals according to
the magnetic signals, the control logic module 242 may keep
generating the DC control signals, and may stop generating the DC
control signals upon expiration of the delay time period
corresponding to the delay time signals. Therefore, when the
control logic module 242 determines not to continuously generate
the DC control signals according to the magnetic signals, the first
LCD panel 251 and the second LCD panel 252 may be transparent after
the delay time period expires.
[0065] The delay time period may be a safeguard against flash burn,
ultraviolet light, sparks, infrared light, and heat. When the
welder just finishes welding, the first LCD panel 251 and the
second LCD panel 252 may keep darkened during the delay time period
to protect the eyes of the welder from damage.
[0066] With reference to FIGS. 9A and 9B, in one embodiment of the
present disclosure, the AC control signals may be square wave
signals. The frequency of the AC control signals is smaller than 1
Hz. In other words, the period T of the AC control signals is
greater than 1 second. Values of peaks of the square wave signals
may correspond to the light transmittance value of the first LCD
panel 251 and the second LCD panel 252. The first LCD panel 251 is
controlled by AC control signals LCD-A, the second LCD panel 252 is
controlled by AC control signals LCD-B, and the AC control signals
LCD-A may have a phase shift PS with the AC control signals
LCD-B.
[0067] Since the first LCD panel 251 is controlled by the AC
control signals with the phase shift and the second LCD panel 252
is controlled by the AC control signals without the phase shift,
the refresh time of the first LCD panel 251 and the refresh time of
the second LCD panel 252 may not synchronize. Therefore, when the
frequency of the AC control signals is lower than 1 Hz, the welder
may not feel the first LCD panel 251 or the second LCD panel 252
fleshing.
[0068] In FIG. 9A, the AC control signals LCD-B without the phase
shift PS may be outputted to the first LCD panel 251. In FIG. 9B,
the AC control signals LCD-A with the phase shift PS may be
outputted to the second LCD panel 252.
[0069] With reference to FIG. 10, an area of the first LCD panel
251 may be calculated by multiplying a length of the first LCD
panel 251 with a width of the first LCD panel 251. An area of the
second LCD panel 252 may be calculated by multiplying a length
value of the second LCD panel 252 with a width value of the second
LCD panel 252. In the embodiment, the first LCD panel 251 and the
second LCD panel 252 may be integrated into one component
[0070] In one embodiment of the present disclosure, the area of the
first LCD panel 251 may be greater than 85 square centimeters, and
the area of the second LCD panel 252 may be greater than 85 square
centimeters.
[0071] Since the frequency of the AC control signals may be lower
than 1 Hz, the power consumption caused by the AC control signals
may be decreased. In the premise of the same battery capacity, the
filter control unit 24 may have enough electric power to drive the
filter lens 25 of a large size.
[0072] Even though numerous characteristics and advantages of the
present invention have been set forth in the foregoing description,
together with details of the structure and function of the
invention, the disclosure is illustrative only. Changes may be made
in detail, especially in matters of shape, size, and arrangement of
parts within the principles of the invention to the full extent
indicated by the broad general meaning of the terms in which the
appended claims are expressed.
* * * * *