WO2018072355A1 - 可实现高遮光号的自动变光过滤器 - Google Patents

可实现高遮光号的自动变光过滤器 Download PDF

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Publication number
WO2018072355A1
WO2018072355A1 PCT/CN2017/071245 CN2017071245W WO2018072355A1 WO 2018072355 A1 WO2018072355 A1 WO 2018072355A1 CN 2017071245 W CN2017071245 W CN 2017071245W WO 2018072355 A1 WO2018072355 A1 WO 2018072355A1
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Prior art keywords
liquid crystal
control circuit
positive
filter
light
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Application number
PCT/CN2017/071245
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English (en)
French (fr)
Inventor
吴子乾
Original Assignee
泰克曼(南京)电子有限公司
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Application filed by 泰克曼(南京)电子有限公司 filed Critical 泰克曼(南京)电子有限公司
Priority to US16/315,454 priority Critical patent/US10890792B2/en
Publication of WO2018072355A1 publication Critical patent/WO2018072355A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/04—Eye-masks ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
    • A61F9/06—Masks, shields or hoods for welders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/04—Eye-masks ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
    • A61F9/06—Masks, shields or hoods for welders
    • A61F9/065—Masks, shields or hoods for welders use of particular optical filters
    • A61F9/067—Masks, shields or hoods for welders use of particular optical filters with variable transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer
    • G02F2201/083—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer infrared absorbing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/08—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 light absorbing layer
    • G02F2201/086—UV absorbing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements

Definitions

  • the invention relates to the field of optoelectronic technology, in particular to an automatic dimming filter, which can be used for protecting a user's eyes in a strong light environment.
  • the automatic darkening filter (ADF) in the prior art is composed of a liquid crystal, a control circuit, a solar panel/battery, a photo-sensing sensor, and an ultraviolet and infrared filter.
  • the liquid crystal in the auto-dimming filter usually contains two positive liquid crystals.
  • the light sensor receives the welding arc and transmits the information to the control circuit.
  • the control circuit outputs a square wave signal to the two positive liquid crystals, thereby instantaneously triggering the automatic change.
  • the liquid crystal in the optical filter is darkened, and the ultraviolet rays and infrared rays in the welding arc are reflected off, and appropriate visible light is projected to the bottom of the user's eye, and the light transmission is reduced to an appropriate extent.
  • the shading number of the automatic dimming filter is generally in the range between 5th and 13th, and the variation of the shading number from 5-13 is achieved by adjusting the voltage amplitude of the square wave signal.
  • the prior art automatic dimming filter is difficult to achieve a higher shading number, so that the liquid crystal module exhibits a higher darkness effect. This makes the automatic dimming filter not optimal for the eye protection and its power consumption is not minimized.
  • the present invention provides an automatic dimming filter, comprising: a first positive liquid crystal and a second positive liquid crystal; a first liquid crystal control circuit, configured to control the first according to the received control signal Positive liquid crystal and second positive liquid crystal; negative phase liquid crystal, said a negative phase liquid crystal is disposed between the first positive liquid crystal and the second positive liquid crystal; a second liquid crystal control circuit is configured to control the negative phase liquid crystal according to the received control signal; UV/IR (ultraviolet/infrared) a filter for filtering the welding arc; a light control circuit for detecting the intensity of the welding arc, generating a corresponding control signal according to the light intensity of the detecting arc and outputting to the main control circuit; the main control circuit, The light control circuit, the first liquid crystal control circuit and the second liquid crystal control circuit are respectively connected to output the liquid crystal control signals to the first liquid crystal control circuit and the second liquid crystal control circuit.
  • the auto-lighting filter further includes a darkness setting unit connected to the main control circuit, configured to set a shading number of the automatic dimming filter;
  • the shading number set by the darkness setting unit generates a corresponding liquid crystal control signal to control the first positive liquid crystal, the second positive liquid crystal, and the negative phase liquid crystal, so that the auto dimming filter presents the set Shading darkness.
  • the first liquid crystal control circuit when the auto-lighting filter is in a standby state and the shading number is set to 2.5 to 4, the first liquid crystal control circuit is under the control of the main control circuit
  • the working voltage supplied to the first positive liquid crystal and the second positive liquid crystal is 0v;
  • the control signal provided by the second liquid crystal control circuit to the negative phase liquid crystal is an operating voltage of 2.5v to 15v and a frequency of 0.05 Square wave or DC voltage between Hz and 20 Hz.
  • the first liquid crystal control circuit when the shading number is set to No. 5 to No. 15, the first liquid crystal control circuit is directed to the first positive liquid crystal and the second under the control of the main control circuit
  • the control signal provided by the positive liquid crystal is a square wave with an operating voltage of 1.5V to 8v and a frequency of 10Hz to 60Hz;
  • the control signal provided by the second liquid crystal control circuit to the negative phase liquid crystal is an operating voltage of 2.5v A square wave or DC voltage of between 15 Hz and 20 Hz with a frequency of 15 volts.
  • a preferred operating voltage of the square wave provided by the first liquid crystal control circuit to the first positive liquid crystal and the second positive liquid crystal is 3v to 8v to achieve 14, 15 or higher Shading number.
  • the main control circuit when the light sensor in the light control circuit detects the end of the welding operation, the main control circuit outputs a darkness gradation control signal to the first liquid crystal control circuit and the second liquid crystal control circuit, In order to make the blackout darkness of the automatic dimming filter change from high to low.
  • the auto-dimming filter further comprises at least one of the following units connected to the main control circuit: a delay setting unit for setting a filter delay of the auto-dimmer filter And a sensitivity setting unit configured to set a filter sensitivity of the automatic dimming filter.
  • the first positive liquid crystal and the second positive liquid crystal are positive normal phase liquid crystals
  • the negative phase liquid crystal is a positive negative phase liquid crystal
  • the present invention also provides a welding mask assembly including the above described automatic dimming filter.
  • the automatic dimming filter and welding mask of the present invention can achieve a higher shading number than the prior art, thereby optimizing the eye protection effect and minimizing power consumption.
  • FIG. 1 is a block diagram showing the circuit configuration of an embodiment of an automatic dimming filter of the present invention
  • FIG. 2 is a schematic view showing the relative positional relationship of each liquid crystal in the embodiment of the automatic light-reducing filter of the present invention
  • Figure 3 is a schematic view showing the structure of an embodiment of the welding mask assembly of the present invention.
  • Figure 4 is a front view and a front view of the automatic light-reducing filter in the embodiment shown in Figure 3;
  • Fig. 5 is a schematic view showing the functional operation area of the reverse side of the automatic dimming filter shown in Fig. 4.
  • Fig. 1 shows the circuit configuration of an embodiment of the automatic light-reducing filter of the present invention.
  • the circuit portion of the auto-dimming filter includes a main control circuit, a light control circuit, a liquid crystal control circuit A, and a liquid crystal control circuit B.
  • the main control circuit is respectively connected to the light control circuit, the liquid crystal control circuit A and the liquid crystal control circuit B.
  • the main control circuit also receives pre-set or input filter delay control parameters, filter darkness control parameters and filter sensitivity control parameters (as shown on the left side of Figure 1).
  • the liquid crystal control circuit A is for controlling the positive normal phase liquid crystal LCD1 and the LCD 2
  • the liquid crystal control circuit B is for controlling the positive negative liquid crystal LCD3.
  • Fig. 2 is a view showing the relative positional relationship of respective liquid crystals in the embodiment of the auto-darden filter of the present invention.
  • the bottom-up includes: UV/IR glass, positive normal phase liquid crystal LCD1, positive The negative phase liquid crystal LCD 3, the positive normal phase liquid crystal LCD 2 and the protective white glass, it is assumed here that the welding arc is incident from the bottom to the top.
  • the liquid crystal control circuit A connects and controls the positive normal phase liquid crystal LCD1 and LCD2, and the liquid crystal control circuit B connects and controls the positive negative phase liquid crystal LCD3.
  • This embodiment uses two positive normal phase liquid crystals and one positive negative phase liquid crystal.
  • the phase angle of the positive negative phase liquid crystal is opposite to the phase angle of the two positive normal phase liquid crystals.
  • two positive normal phase liquid crystals and one positive negative phase liquid crystal are connected to two different liquid crystal control circuits.
  • the shading numbers of 14, 15 or higher can be realized.
  • the working voltage of the positive negative phase liquid crystal as the blackness compensation on the basis of realizing the shading number of 14, 15 or higher, the shading darkness of the automatic dimming filter when the standby is not working can be reduced to 2.5 to 4.0. Between the users, a clearer, brighter standby view ensures better solder preparation.
  • LCD 1 and LCD 2 are positive normal phase liquid crystals and LCD 3 is a positive negative phase liquid crystal.
  • LCD 3 is a positive negative phase liquid crystal.
  • the three LCDs When the three LCDs are not powered, the light enters from LCD1, due to LCD3 and LCD1 It is a negative match, the light can't enter LCD2 completely through LCD3, and the three LCD combinations look black.
  • the size of the darkness can be achieved by adjusting the pretilt angle of the liquid crystal crystal of the LCD 3.
  • LCD1 and LCD2 are not powered, and LCD3 is powered up, the liquid crystal molecules of LCD3 rotate and form a positive match with LCD1 and LCD2, so that the three liquid crystal combinations appear to be light transmissive.
  • the light sensor in the light control circuit detects the welding arc, and after the operation of the operational amplifier, the light control circuit sends the detected signal to the main control circuit.
  • the main control circuit can accordingly set the shading darkness (corresponding to the shading number) of the auto-dimmering filter according to the detected intensity of the welding arc, or can be set or input by the user.
  • the main control circuit can include a microcontroller.
  • the delay control parameter, the darkness control parameter and the sensitivity control parameter set or input by the user are read by the single chip microcomputer, and the corresponding control signals are output to the liquid crystal control circuits A and B to control the liquid crystal LCD1, LCD2 and The LCD3 allows the welding arc to pass through the liquid crystals to exhibit the darkness set to protect the user's eyes from injury.
  • the main control circuit passes through the liquid crystal control circuit.
  • A is applied to the liquid crystal LCD1 and LCD2 with a voltage of 0V; the liquid crystal control circuit B operates at a low frequency square wave or DC voltage of 0.05-20 Hz, and the voltage amplitude is between 2.5V and 15V.
  • the signal applied to the liquid crystal control circuit A is a square wave of 10-60 Hz and a voltage amplitude of 1.5V-8V, and is still 0.05- added to the liquid crystal control circuit B.
  • a square wave of 3V-8V is applied to the two positive normal phase liquid crystal LCD1 and LCD3, and the output is adjusted to positive positive by adjusting the liquid crystal control circuit B.
  • the operating voltage of the liquid crystal LCD 2 achieves a darkness of 14, 15 or higher, while saving the power consumption of the auto-dimming filter.
  • Main control circuit is controlled by liquid crystal
  • the circuit B outputs a control signal to adjust the working voltage on the positive negative phase liquid crystal, so that the shading number of the automatic dimming filter is gradually changed from No. 14, 15 or higher, and finally to the non-working bright shading number, thereby Ensure that the user's eyes adapt to changes in darkness and improve the user's eye comfort.
  • the working voltage applied to the LCD1 and the LCD2 is released first, and the LCD 3 is set in advance, so that the darkening darkness of the automatic dimming filter is 5-7, and then output by the liquid crystal control circuit B.
  • the shading darkness of the auto-dimming filter is gradually lowered to become, for example, 2.5 to 4, thereby realizing a gradation of darkness from high to low.
  • the positive liquid crystal LCD1 and the LCD3 may be positive positive phase liquid crystals
  • the negative phase liquid crystal LCD 2 may be positive negative phase liquid crystal
  • FIG. 3 illustrates the construction of an embodiment of a welding mask assembly of the present invention.
  • the welding mask assembly comprises: an adjustable headband (1) for the user to wear, a filter holder (2) for supporting the automatic dimming filter, an automatic dimming filter (3), for protecting the automatic dimming
  • the left and right views in Fig. 4 respectively show the reverse side and the front side of the auto-dimming filter (3) in the embodiment shown in Fig. 3.
  • a battery case (7) for mounting a battery, a liquid crystal panel (8), and a functional operation area (9) are provided on the reverse side shown in the left diagram of Fig. 4.
  • a functional operation area (9) are provided on the front side shown in the right diagram of Fig. 4, there are arranged a plurality of welding arc sensors (10) for detecting welding arcs, and solar panels (11) for solar cells.
  • the automatic dimming filter (3) may include a plurality of function buttons and a digital display screen disposed in the function operating area (9), and corresponding circuit units, as a delay setting unit, darkness
  • the setting unit and the sensitivity setting unit are respectively used for setting or inputting the delay control parameter, the darkness control parameter and the sensitivity control parameter.
  • the function operation area (9) includes a power-on key “ON” and a mode switching key “MODE” (91), a function switching key “FUNC” (92), a digital display (93), and a function digital adjustment key. "UP” and “DOWN” (94).
  • the power-on button “ON” is used to turn on the automatic dimming filter, and the mode switch key “MODE” can be used, for example, for “darkness 14-15 (DIN) 14-15)", “Welding (WELD)", “Cutting”, “grinding (GRIND)” four modes of switching, to set the automatic dimming filter to achieve the corresponding different shading darkness.
  • the switch key “FUNC” (92) is used to switch the three parameter setting functions of SHADE, SENSITIVITY and DELAY.
  • the digital display (93) can display these three parameters and settings. The above mode and battery margin.
  • the function digital adjustment button is used to increase or decrease the parameter listed on the far right of the digital display (93) by pressing the buttons “UP” and “DOWN” (94) when the function option is selected. The size of the number.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Ophthalmology & Optometry (AREA)
  • Heart & Thoracic Surgery (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种自动变光过滤器，包括：第一正性液晶(LCD1)和第二正性液晶(LCD2)；第一液晶控制电路(A)，用于根据接收的控制信号来控制第一正性液晶(LCD1)和第二正性液晶(LCD2)；负相液晶(LCD3)，负相液晶(LCD3)设置在第一正性液晶(LCD1)与第二正性液晶(LCD2)之间；第二液晶控制电路(B)，用于根据接收的控制信号来控制负相液晶(LCD3)；UV/IR滤光片，用于对焊接弧光进行滤光处理；光控电路，用于检测焊接弧光，根据检测的焊接弧光的光强产生相应的控制信号并输出给主控制电路；主控制电路，分别连接光控电路、第一液晶控制电路(A)和第二液晶控制电路(B)，用于输出液晶控制信号给第一液晶控制电路(A)和第二液晶控制电路(B)。

Description

可实现高遮光号的自动变光过滤器 技术领域
本发明涉及光电技术领域，具体涉及一种自动变光过滤器，可用于在强光环境下保护使用者的眼睛。
背景技术
目前现有技术中的自动变光过滤器(Auto Darkening Filter,简称ADF)是由液晶、控制电路、太阳能电池板/电池、光感性传感器和紫外线、红外线过滤器组合而成。自动变光过滤器中的液晶通常包含两片正性液晶。在强光环境下，例如当焊接电弧发生时，光感性传感器接收到焊接弧光后，将信息传递给控制电路，控制电路输出方波信号加到这两片正性液晶，由此瞬间触发自动变光过滤器中的液晶并使其变暗，焊接弧光中的紫外线和红外线被反射掉，适当的可见光投射到使用者的眼底，透光减少到适当的程度。目前自动变光过滤器的遮光号一般为5号至13号之间的范围，通过调节方波信号的电压振幅大小实现遮光号从5-13号之间的变化。
然而现有技术的自动变光过滤器难以实现更高的遮光号，以使液晶组件呈现更高暗度的效果。这使得自动变光过滤器的护目效果不能达到最佳，且其耗电量也未降至最低。
发明内容
为解决上述技术问题，本发明提供一种自动变光过滤器，包括：第一正性液晶和第二正性液晶；第一液晶控制电路，用于根据接收的控制信号来控制所述第一正性液晶和第二正性液晶；负相液晶，所述 负相液晶设置在所述第一正性液晶与第二正性液晶之间；第二液晶控制电路，用于根据接收的控制信号来控制所述负相液晶；UV/IR(紫外线/红外线)滤光片，用于对焊接弧光进行滤光处理；光控电路，用于检测焊接弧光的光强，根据检测焊接弧光的光强产生相应的控制信号并输出给主控制电路；主控制电路，分别连接光控电路、第一液晶控制电路和第二液晶控制电路，用于输出液晶控制信号给所述第一液晶控制电路和所述第二液晶控制电路。
根据本发明的实施例，所述自动变光过滤器还包括与所述主控制电路连接的暗度设置单元，用于设置所述自动变光过滤器的遮光号；所述主控制电路根据所述暗度设置单元设置的遮光号生成相应的所述液晶控制信号来控制所述第一正性液晶、第二正性液晶和负相液晶，以使所述自动变光过滤器呈现所设置的遮光暗度。
根据本发明的实施例，当所述自动变光过滤器处于待机状态，所述遮光号被设置为2.5号至4号时，在所述主控制电路的控制下，所述第一液晶控制电路向所述第一正性液晶和第二正性液晶提供的工作电压为0v；所述第二液晶控制电路向所述负相液晶提供的控制信号是工作电压为2.5v至15v、频率为0.05Hz至20Hz之间的方波或直流电压。
根据本发明的实施例，当所述遮光号被设置为5号至15号时，在所述主控制电路的控制下，所述第一液晶控制电路向所述第一正性液晶和第二正性液晶提供的控制信号是工作电压为1.5v至8v、频率为10Hz至60Hz之间的方波；所述第二液晶控制电路向所述负相液晶提供的控制信号是工作电压为2.5v至15v、频率为0.05Hz至20Hz之间的方波或直流电压。
根据本发明的实施例，所述第一液晶控制电路向所述第一正性液晶和第二正性液晶提供的方波的优选工作电压为3v至8v，以实现14、15或更高的遮光号。
根据本发明的实施例，所述光控电路中的光感应器检测到焊接操作结束时，所述主控制电路向所述第一液晶控制电路和第二液晶控制电路输出暗度渐变控制信号，以使所述自动变光过滤器的遮光暗度从高渐变到低。
根据本发明的实施例，所述自动变光过滤器还包括与所述主控制电路连接的以下单元中的至少一个：延时设置单元，用于设置所述自动变光过滤器的滤光延时；以及灵敏度设置单元，用于设置所述自动变光过滤器的滤光灵敏度。
根据本发明的实施例，所述第一正性液晶和第二正性液晶是正性正相液晶，所述负相液晶是正性负相液晶。
本发明还提供一种焊接面罩组件，其中包括以上所述的自动变光过滤器。
本发明的自动变光过滤器和焊接面罩能够实现比现有技术更高的遮光号，从而使其护目效果达到最佳，并使其耗电量降至最低。
以下结合附图详细说明本发明的实施例。
附图说明
图1是本发明的自动变光过滤器的实施例的电路结构框图；
图2是本发明的自动变光过滤器的实施例中各液晶的相对位置关系示意图；
图3是本发明的焊接面罩组件的实施例的结构示意图；
图4是图3所示实施例中的自动变光过滤器的反面和正面示意图；
图5是图4所示的自动变光过滤器的反面设置的功能操作区示意图。
具体实施方式
图1示出本发明的自动变光过滤器的实施例的电路结构。在该实施例中，自动变光过滤器的电路部分包括主控制电路、光控电路、液晶控制电路A和液晶控制电路B。主控制电路分别连接光控电路、液晶控制电路A和液晶控制电路B。主控制电路还接收预先设置或输入的滤光延时控制参数、滤光暗度控制参数和滤光灵敏度控制参数(如图1左侧所示)。液晶控制电路A用于控制正性正相液晶LCD1和LCD2，液晶控制电路B用于控制正性负相液晶LCD3。
图2示出本发明的自动变光过滤器的实施例中各液晶的相对位置关系。在图2所示的光学部件(即图2中部的五个黑色长条)中，自下而上包括：紫外线/红外线滤光片(UV/IR Glass)、正性正相液晶LCD1、正性负相液晶LCD3、正性正相液晶LCD2和起保护作用的白玻璃，这里假设焊接弧光是从下向上入射。液晶控制电路A连接并控制正性正相液晶LCD1和LCD2，液晶控制电路B连接并控制正性负相液晶LCD3。
本实施例采用两片正性正相液晶和一片正性负相液晶。正性负相液晶的相位角与两片正性正相液晶的相位角相反。为了配合采用这三片液晶的工作模式，将两片正性正相液晶和一片正性负相液晶接入两个不同的液晶控制电路。通过这两个液晶控制电路调节两片正性正相液晶和一片正性负相液晶的工作电压，可以实现14、15或更高的遮光号。其中通过调节正性负相液晶的工作电压作为黑度补偿，在实现14、15或更高遮光号的基础上，可以将自动变光过滤器待机不工作时的遮光暗度降低到2.5到4.0之间，使用者能够通过更清晰、更亮的待机观察，保证更好的焊接准备。
在本发明的实施例中，LCD1和LCD2是正性正相液晶，LCD3是正性负相液晶。LCD3液晶两侧玻璃面没有偏光片，液晶晶体分子预倾角与LCD1和LCD2接触的玻璃面上的偏光片为负相搭配。
当这三片液晶都不加电时，光从LCD1进入后，由于LCD3与LCD1 是负相搭配的，光无法完全透过LCD3进入LCD2，这三片液晶组合看上去是黑的。暗度的大小可以通过调节LCD3的液晶晶体的预倾角来实现。当LCD1和LCD2不加电，而LCD3加电时，LCD3的液晶晶体分子发生了旋转与LCD1、LCD2形成了正相搭配，这样三片液晶组合看上去是透光的。
当发生弧光焊接时，光控电路中的光感应器检测到焊接弧光，经运算放大器处理后，光控电路将检测的信号输送到主控制电路。主控制电路可根据所检测到的焊接弧光的强度相应地设置自动变光过滤器的遮光暗度(对应于遮光号)，也可由使用者自行设置或输入。主控制电路可包含单片机。在工作时，由单片机读取用户所设置或输入的延时控制参数、暗度控制参数和灵敏度控制参数，并将相应的控制信号输出至液晶控制电路A和B，以控制液晶LCD1、LCD2和LCD3，使焊接弧光经过这些液晶后呈现所设置的暗度，以保护使用者的眼睛免受伤害。
当自动变光过滤器处于待机状态时，或者自动变光过滤器的遮光号被设置为DIN 2.5-DIN 4号(DIN表示德国工业标准感光片感光度的单位)时，主控制电路通过液晶控制电路A加在液晶LCD1和LCD2上电压为0V；液晶控制电路B的工作电压为0.05-20Hz的低频方波或者直流电压，电压振幅为2.5V-15V之间。
当暗度参数设置为5-13号之间时，加在液晶控制电路A上的信号为10-60Hz、电压振幅1.5V-8V的方波，加在液晶控制电路B上的仍为0.05-20Hz、电压振幅为2.5V-15V的低频方波或直流电压。
当暗度参数设置为14、15或更高的遮光号时，两片正性正相液晶LCD1和LCD3上加有3V-8V的方波，此时通过调节液晶控制电路B输出到正性负相液晶LCD2的工作电压来实现14、15或者更高的暗度，同时可以节省自动变光过滤器的耗电。
当焊接工作结束时，焊接弧光消失。主控制电路通过向液晶控制 电路B输出控制信号，以调节正性负相液晶上的工作电压，实现自动变光过滤器的遮光号从14、15号或更高号实现渐变，最后到不工作的亮态遮光号，从而确保使用者眼睛适应暗度的变化过程，改善使用者的眼睛舒适度。例如，当焊接工作结束后，先释放加在LCD1和LCD2上的工作电压，通过提前设置LCD3，使得此时自动变光过滤器的遮光暗度为5～7号，然后由液晶控制电路B输出方波或电平到LCD3上后，使自动变光过滤器的遮光暗度渐渐降低，变为例如2.5至4号，从而实现暗度由高到低的渐变。
在本发明的实施例中，正性液晶LCD1和LCD3可以采用正性正相液晶，负相液晶LCD2可以采用正性负相液晶。
图3示出本发明的焊接面罩组件的实施例的结构。该焊接面罩组件包括：供使用者佩戴的可调节头带(1)、用于支撑自动变光过滤器的过滤器支架(2)、自动变光过滤器(3)、用于保护自动变光过滤器的前保护片(4)、密封件(5)及焊接面罩(6)。
图4中的左图和右图分别示出图3所示实施例中的自动变光过滤器(3)的反面和正面。在图4的左图所示的反面设置有用于安装电池的电池盒(7)、液晶板(8)及功能操作区(9)。在图4的右图所示的正面设置有若干个用于检测焊接弧光的焊接弧光感应器(10)、以及供太阳能电池使用的太阳能板(11)。
在本发明的实施例中，自动变光过滤器(3)可以包含设置在功能操作区(9)的若干个功能按钮和数码显示屏、以及相应的电路单元，作为延时设置单元、暗度设置单元和灵敏度设置单元，分别用于设置或输入延时控制参数、暗度控制参数和灵敏度控制参数。
如图5所示，功能操作区(9)包括开机键“ON”和模式切换键“MODE”(91)、功能切换键“FUNC”(92)、数码显示屏(93)、功能数字调节键“UP”和“DOWN”(94)。开机键“ON”用于自动变光过滤器的开启，模式切换键“MODE”例如可用于“暗度14-15(DIN 14-15)”、“焊接(WELD)”、“切割(CUTTING)”、“研磨(GRIND)”这四种模式的切换，以设置自动变光过滤器来实现相应不同的遮光暗度。功能切换键“FUNC”(92)用于切换暗度(SHADE)、灵敏度(SENSITIVITY)和延时(DELAY)这三项参数设置功能。数码显示屏(93)可显示这三项参数、所设置的上述模式以及电池余量。功能数字调节键用于在功能选项被选中时，通过按键“UP”和“DOWN”(94)可增大或减小数码显示屏(93)最右边列出的参数的数字大小。

Claims (9)

  1. 一种自动变光过滤器，包括：
    第一正性液晶和第二正性液晶；
    第一液晶控制电路，用于根据接收的控制信号来控制所述第一正性液晶和第二正性液晶；
    负相液晶，所述负相液晶设置在所述第一正性液晶与第二正性液晶之间；
    第二液晶控制电路，用于根据接收的控制信号来控制所述负相液晶；
    UV/IR滤光片，用于对焊接弧光进行滤光处理；
    光控电路，用于检测焊接弧光的光强，根据检测焊接弧光的光强产生相应的控制信号并输出给主控制电路；
    主控制电路，分别连接光控电路、第一液晶控制电路和第二液晶控制电路，用于输出液晶控制信号给所述第一液晶控制电路和所述第二液晶控制电路。
  2. 根据权利要求1的自动变光过滤器，还包括与所述主控制电路连接的暗度设置单元，用于设置所述自动变光过滤器的遮光号；
    所述主控制电路根据所述暗度设置单元设置的遮光号生成相应的所述液晶控制信号来控制所述第一正性液晶、第二正性液晶和负相液晶，以使所述自动变光过滤器呈现所设置的遮光暗度。
  3. 根据权利要求2的自动变光过滤器，其中，当所述自动变光过滤器处于待机状态，所述遮光号被设置为2.5号至4号时，在所述主控制电路的控制下，所述第一液晶控制电路向所述第一正性液晶和第二正性液晶提供的工作电压为0v；所述第二液晶控制电路向所述 负相液晶提供的控制信号是工作电压为2.5v至15v、频率为0.05Hz至20Hz之间的方波或直流电压。
  4. 根据权利要求2的自动变光过滤器，其中，当所述遮光号被设置为5号至15号时，在所述主控制电路的控制下，所述第一液晶控制电路向所述第一正性液晶和第二正性液晶提供的控制信号是工作电压为1.5v至8v、频率为10Hz至60Hz之间的方波；所述第二液晶控制电路向所述负相液晶提供的控制信号是工作电压为2.5v至15v、频率为0.05Hz至20Hz之间的方波或直流电压。
  5. 根据权利要求4的自动变光过滤器，其中，所述第一液晶控制电路向所述第一正性液晶和第二正性液晶提供的方波的工作电压为3v至8v。
  6. 根据权利要求1的自动变光过滤器，其中，所述光控电路中的光感应器检测到焊接操作结束时，所述主控制电路向所述第一液晶控制电路和第二液晶控制电路输出暗度渐变控制信号，以使所述自动变光过滤器的遮光暗度从高渐变到低。
  7. 根据权利要求1或2的自动变光过滤器，还包括与所述主控制电路连接的以下单元中的至少一个：
    延时设置单元，用于设置所述自动变光过滤器的滤光延时；以及
    灵敏度设置单元，用于设置所述自动变光过滤器的滤光灵敏度。
  8. 根据权利要求1至6中任一项的自动变光过滤器，其中，所述第一正性液晶和第二正性液晶是正性正相液晶，所述负相液晶是正性负相液晶。
  9. 一种焊接面罩组件，包括权利要求1至8中任一项所述的自动变光过滤器。
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