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WO2011000074A1 - Dispositif d'avertissement en cas de sous-tension de la batterie d'un filtre auto-obscurcissant d'un casque de soudeur - Google Patents

Dispositif d'avertissement en cas de sous-tension de la batterie d'un filtre auto-obscurcissant d'un casque de soudeur Download PDF

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Publication number
WO2011000074A1
WO2011000074A1 PCT/CA2009/000922 CA2009000922W WO2011000074A1 WO 2011000074 A1 WO2011000074 A1 WO 2011000074A1 CA 2009000922 W CA2009000922 W CA 2009000922W WO 2011000074 A1 WO2011000074 A1 WO 2011000074A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
low
lcd shutter
battery
opacity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA2009/000922
Other languages
English (en)
Inventor
Gang Chen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to PCT/CA2009/000922 priority Critical patent/WO2011000074A1/fr
Publication of WO2011000074A1 publication Critical patent/WO2011000074A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means
    • G01J1/24—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors
    • G01J1/26—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means using electric radiation detectors adapted for automatic variation of the measured or reference value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J1/0228—Control of working procedures; Failure detection; Spectral bandwidth calculation
    • 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
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/02—Details
    • G01J2001/0276—Protection
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • 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
    • 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

Definitions

  • a conventional auto-darkening optical filter system for a welding helmet has both an optical band-pass filter that continuously blocks damaging ultraviolet and infrared radiation from reaching a welder's eyes and an auto-darkening LCD shutter that allows essentially all ambient visible light to pass but darkens in the presence of intense visible light - for example during a welding operation - to allow only a portion of the visible light to reach the welder's eyes. In this way, the welder's eyes receive an appropriate amount of visible light to see both during welding operations and otherwise.
  • the band-pass filter and the LCD shutter are stacked one atop the other in series and both are protected by a cover glass.
  • an optical sensor detects light intensity proximate the cover glass.
  • An LCD driver electrically connected to both the optical sensor and the LCD shutter applies a variable shuttering voltage to the LCD shutter to cause the LCD shutter to increase its opacity in response to increasing light intensity detected by the optical sensor.
  • This increase in opacity may be a simple change between a transparent state and a translucent state or may be a more gradual change through multiple states of increasing translucency, for more expensive systems.
  • a typical solution to this problem has been to include an indicator light - often an LED ⁇ in the system, which illuminates or flashes when the battery voltage falls below a predetermined threshold and is therefore close to being insufficient to power the system. While an improvement, this arrangement has a number of disadvantages. For example, a small light can be difficult to notice in a bright welding environment. Furthermore, illuminating a light - even an energy-efficient LED - depletes the battery further.
  • the present invention is directed to such a solution.
  • an auto-darkening optical filter system for a welding helmet having: a low-voltage detection module operable to generate a warning signal in response to detecting low- voltage at the battery and a low- voltage annunciation module operable to announce a battery low- voltage condition in response to the warning signal by applying an annunciating voltage to the LCD shutter to cause the LCD shutter to change its opacity.
  • the low- voltage detection module might include a voltage reference and a comparator connected between the voltage reference and the battery.
  • the voltage reference might include a photovoltaic cell and a voltage regulator.
  • the low-voltage annunciation module might include an oscillator to strobe the LCD shutter to cause the LCD shutter to periodically increase and decrease its opacity.
  • the oscillator may include a timer circuit.
  • Figure 1 is an exploded isometric view of one embodiment of an auto- darkening optical filter system according to one aspect of the present invention, the system including an LCD driver.
  • Figure 2 is a schematic view of one embodiment of a low-voltage detection module in the LCD driver of Figure 1.
  • Figure 3 is a schematic view of one embodiment of a low- voltage annunciation module in the LCD driver of Figure 1.
  • the auto-darkening optical filter system 10 includes an optical band-pass filter 110 to continuously prevent damaging ultraviolet and infrared radiation emitted by a welding operation from reaching a welder's eyes and an auto-darkening LCD shutter 210 that additionally reduces the portion of visible light emitted by the welding operation from reaching the welder's eyes.
  • the band-pass filter 110 and the LCD shutter 210 are stacked one atop the other in series and both are protected by a cover glass 410.
  • the system 10 also includes an optical sensor 510 to detect light intensity proximate the cover glass 410 and an LCD driver 310 electrically connected to both the optical sensor 510 and the LCD shutter 210.
  • the LCD driver 310 applies a variable shuttering voltage to the LCD shutter 210 to cause the LCD shutter 210 to increase its opacity in response to increasing light intensity detected by the optical sensor 510. This increase in opacity may be a simple change between a transparent state and a translucent state or may be a more gradual change through multiple states of increasing translucency, for more expensive systems 10.
  • the system 10 includes battery terminals 305 adapted to electrically connect a battery to power the LCD driver 310.
  • the system 10 further includes a low-voltage detection module 320 and a low- voltage annunciation module 330. These modules 320, 330 might be incorporated into the LCD driver 310.
  • the low- voltage detection module 320 is configured to generate a warning signal in response to detecting low- voltage at the battery terminals 305.
  • the detection module 320 includes a voltage reference 340 and a comparator 350 connected between the voltage reference 340 and the battery terminals 305 to compare the voltage at the battery terminals 305 against the voltage reference 340 and to generate a corresponding signal.
  • the voltage reference 340 includes a photovoltaic cell 360 and a voltage regulator 370.
  • the low-voltage annunciation module 330 is configured to announce a battery low- voltage condition in response to the warning signal by applying an annunciating voltage to the LCD shutter 210 to cause the LCD shutter 210 to change its opacity.
  • the low- voltage annunciation module 330 includes an oscillator 380 to strobe the annunciating voltage to cause the LCD shutter 210 to periodically increase and decrease its opacity for even greater perceptibility.
  • the oscillator 380 is embodied as the output pin of a ubiquitous TLC555CD integrated circuit 385 configured as an astable multivibrator timer circuit 390, the output pin providing the annunciation voltage to the LCD shutter 210.
  • the reset pin of the TLC555CD integrated circuit 385 is connected to receive the warning signal from the detection module 320.
  • a welder dons a welding helmet (Not Shown) having the auto-darkening optical filter module.
  • the optical sensor 510 monitors light intensity proximate the cover glass 410 and the LCD driver 310 applies a shuttering voltage to the LCD shutter 210 to produce an amount of opacity commensurate with the light intensity monitored.
  • the LCD shutter 210 may be essentially transparent to permit substantially all of the ambient visible light to reach the eyes of the welder.
  • the LCD shutter 210 will be more opaque to reduce the portion of visible light permitted to reach the eyes of the welder.
  • the low-voltage detection module 320 continuously monitors the voltage of the battery at the battery terminals 305 and compares it to the voltage reference 340, which in this embodiment is set at 3V as a reasonable warning level that balances full battery consumption against a sufficient reserve during a warning to permit use of the welding helmet (Not Shown) until there is an opportunity to change the battery.
  • the voltage at the battery terminals 305 is greater than the voltage reference 340 and the comparator 350 generates a low signal.
  • the voltage at the battery terminals 305 decreases and at some point it falls below the reference voltage 340, at which point the comparator 350 generates a high signal - the warning signal.
  • the low-voltage annunciation module 330 continuously monitors the warning signal at the reset pin of the TLC555CD integrated circuit 385. So long as the warning signal is not being generated by the detection module 320, the reset pin of the TLC555CD integrated circuit 385 is held in a low state as is the annunciating voltage at the output pin. However, when the warning signal is being generated, the reset pin of the TLC555CD integrated circuit 385 is driven to a high state and the TLC555CD integrated circuit 385 generates a periodic annunciating voltage at its output pin.
  • the annunciating voltage at the output pin of the TLC555CD integrated circuit 385 is supplied to the LCD shutter 210 to change the opacity of the LCD shutter 210 as a warning that the battery voltage is low.
  • the annunciating voltage is periodic, having a frequency between 0.1 Hz and 25 Hz.
  • the flicker produced as the LCD shutter 210 changes opacity at that frequency is hard to ignore, and will strongly urge the welder to promptly change the battery.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Liquid Crystal (AREA)

Abstract

Dispositif d'avertissement en cas de sous-tension d'une batterie alimentant en courant un système à filtre optique auto-obscurcissant (10) d'un casque de soudeur, le dispositif indiquant la sous-tension en modifiant, par exemple par effet stroboscopique, l'opacité du système à filtre optique (10).
PCT/CA2009/000922 2009-07-03 2009-07-03 Dispositif d'avertissement en cas de sous-tension de la batterie d'un filtre auto-obscurcissant d'un casque de soudeur Ceased WO2011000074A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CA2009/000922 WO2011000074A1 (fr) 2009-07-03 2009-07-03 Dispositif d'avertissement en cas de sous-tension de la batterie d'un filtre auto-obscurcissant d'un casque de soudeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2009/000922 WO2011000074A1 (fr) 2009-07-03 2009-07-03 Dispositif d'avertissement en cas de sous-tension de la batterie d'un filtre auto-obscurcissant d'un casque de soudeur

Publications (1)

Publication Number Publication Date
WO2011000074A1 true WO2011000074A1 (fr) 2011-01-06

Family

ID=43410390

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2009/000922 Ceased WO2011000074A1 (fr) 2009-07-03 2009-07-03 Dispositif d'avertissement en cas de sous-tension de la batterie d'un filtre auto-obscurcissant d'un casque de soudeur

Country Status (1)

Country Link
WO (1) WO2011000074A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8791831B2 (en) 2011-09-23 2014-07-29 Eaton Corporation System including an indicator responsive to an electret for a power bus
US9093867B2 (en) 2011-09-23 2015-07-28 Eaton Corporation Power system including an electret for a power bus
US9956118B2 (en) 2014-09-15 2018-05-01 3M Innovative Properties Company Personal protective system tool communication adapter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067129A (en) * 1996-03-15 2000-05-23 Osd Envizion, Inc. Welding lens with integrated display and method
US20040036821A1 (en) * 2002-08-22 2004-02-26 Optiva, Inc. Liquid crystal shutter
US20050007667A1 (en) * 2003-07-10 2005-01-13 Fergason John D. Light sensor arrangement for auto-darkening lenses and method
US20050097648A1 (en) * 2000-12-21 2005-05-12 Emil Ackermann Antiglare device for welding protective masks
US20070081250A1 (en) * 2005-10-11 2007-04-12 Bengt Garbergs Control of an automatic darkening filter
US20070289049A1 (en) * 2006-06-20 2007-12-20 Optrel Ag Dazzle protection unit for a portable dazzle protection device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6067129A (en) * 1996-03-15 2000-05-23 Osd Envizion, Inc. Welding lens with integrated display and method
US20050097648A1 (en) * 2000-12-21 2005-05-12 Emil Ackermann Antiglare device for welding protective masks
US20040036821A1 (en) * 2002-08-22 2004-02-26 Optiva, Inc. Liquid crystal shutter
US20050007667A1 (en) * 2003-07-10 2005-01-13 Fergason John D. Light sensor arrangement for auto-darkening lenses and method
US20070081250A1 (en) * 2005-10-11 2007-04-12 Bengt Garbergs Control of an automatic darkening filter
US20070289049A1 (en) * 2006-06-20 2007-12-20 Optrel Ag Dazzle protection unit for a portable dazzle protection device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8791831B2 (en) 2011-09-23 2014-07-29 Eaton Corporation System including an indicator responsive to an electret for a power bus
US8994544B2 (en) 2011-09-23 2015-03-31 Eaton Corporation System including an indicator responsive to an electret for a power bus
US9093867B2 (en) 2011-09-23 2015-07-28 Eaton Corporation Power system including an electret for a power bus
US9385622B2 (en) 2011-09-23 2016-07-05 Eaton Corporation Power system including an electret for a power bus
US9956118B2 (en) 2014-09-15 2018-05-01 3M Innovative Properties Company Personal protective system tool communication adapter
US11090192B2 (en) 2014-09-15 2021-08-17 3M Innovative Properties Company Personal protective system tool communication adapter

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