GB2485963B - Improvements to eye protector devices - Google Patents

Improvements to eye protector devices

Info

Publication number
GB2485963B
GB2485963B GB0513285.7A GB0513285A GB2485963B GB 2485963 B GB2485963 B GB 2485963B GB 0513285 A GB0513285 A GB 0513285A GB 2485963 B GB2485963 B GB 2485963B
Authority
GB
United Kingdom
Prior art keywords
strips
light
tab
transparent
active slab
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.)
Expired - Fee Related
Application number
GB0513285.7A
Other versions
GB2485963A (en
GB0513285D0 (en
Inventor
Jean-Luc Michelin
Jean-Francois Tanne
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of GB0513285D0 publication Critical patent/GB0513285D0/en
Publication of GB2485963A publication Critical patent/GB2485963A/en
Application granted granted Critical
Publication of GB2485963B publication Critical patent/GB2485963B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • A61F9/02—Goggles
    • A61F9/022—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs
    • A61F9/023—Use of special optical filters, e.g. multiple layers, filters for protection against laser light or light from nuclear explosions, screens with different filter properties on different parts of the screen; Rotating slit-discs with variable transmission, e.g. photochromic
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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 
    • G02F1/0102—Constructional details, not otherwise provided for in this subclass
    • 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 
    • G02F1/03—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 ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/0338—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 ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect structurally associated with a photoconductive layer or having photo-refractive properties
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/52—Optical limiters

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Ophthalmology & Optometry (AREA)
  • General Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Materials For Medical Uses (AREA)

Abstract

An electro-optical device for switching between transparent and opaque states, comprises a polarizer (5) and an analyzer (6) and, between them, an active slab of strips (10) of an electrically biasable birefringent material, each strip (10) being situated between a pair of electrodes (13), the device being transparent to light in register with said strips (10) while the material of the strips (10) is electrically biased, the device further comprising at least one tab (4) of a photoconductive material placed on at least a portion of the periphery of the active slab, the material of each tab (4), when struck by a sufficient quantity of light, generating sufficient electrons to increase its conductivity and, very quickly, induce a drop of the electric field across the material of the strips (10), thereby inducing a change to its birefringence, with the device then becoming opaque to light. The device can be used in eye protection against lasers.
GB0513285.7A 2004-08-04 2005-06-29 Improvements to eye protector devices Expired - Fee Related GB2485963B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0408613A FR2970572A1 (en) 2004-08-04 2004-08-04 IMPROVEMENT TO EYE PROTECTION DEVICES

Publications (3)

Publication Number Publication Date
GB0513285D0 GB0513285D0 (en) 2012-03-14
GB2485963A GB2485963A (en) 2012-06-06
GB2485963B true GB2485963B (en) 2012-11-14

Family

ID=45876126

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0513285.7A Expired - Fee Related GB2485963B (en) 2004-08-04 2005-06-29 Improvements to eye protector devices

Country Status (2)

Country Link
FR (1) FR2970572A1 (en)
GB (1) GB2485963B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4462661A (en) * 1982-02-23 1984-07-31 Instrument Flight Research Laser protection goggles
US4595262A (en) * 1984-08-23 1986-06-17 Lockheed Missiles & Space Company, Inc. Tunable birefringent safety goggles for laser beams
GB2230346A (en) * 1989-04-06 1990-10-17 Marconi Gec Ltd Optical instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4462661A (en) * 1982-02-23 1984-07-31 Instrument Flight Research Laser protection goggles
US4595262A (en) * 1984-08-23 1986-06-17 Lockheed Missiles & Space Company, Inc. Tunable birefringent safety goggles for laser beams
GB2230346A (en) * 1989-04-06 1990-10-17 Marconi Gec Ltd Optical instrument

Also Published As

Publication number Publication date
GB2485963A (en) 2012-06-06
GB0513285D0 (en) 2012-03-14
FR2970572A1 (en) 2012-07-20

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130214