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EP1217974A1 - Dispositif anti-eblouissement - Google Patents

Dispositif anti-eblouissement

Info

Publication number
EP1217974A1
EP1217974A1 EP00958078A EP00958078A EP1217974A1 EP 1217974 A1 EP1217974 A1 EP 1217974A1 EP 00958078 A EP00958078 A EP 00958078A EP 00958078 A EP00958078 A EP 00958078A EP 1217974 A1 EP1217974 A1 EP 1217974A1
Authority
EP
European Patent Office
Prior art keywords
shielding element
circuit board
shielding
printed circuit
glare device
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.)
Withdrawn
Application number
EP00958078A
Other languages
German (de)
English (en)
Inventor
Rico Sonderegger
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.)
Optrel AG
Original Assignee
Optrel AG
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 Optrel AG filed Critical Optrel AG
Publication of EP1217974A1 publication Critical patent/EP1217974A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/002—Casings with localised screening
    • H05K9/0022—Casings with localised screening of components mounted on printed circuit boards [PCB]
    • H05K9/0024—Shield cases mounted on a PCB, e.g. cans or caps or conformal shields
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S2/00—Apparel
    • Y10S2/905—Electric

Definitions

  • the invention is in the field of anti-glare devices which are used, for example, as viewing windows for welding protective masks, helmets or goggles. It relates to an anti-glare device according to the preamble of the first claim. In addition, the invention is in the field of electromagnetic compatibility (EMC) and relates to an EMC shielding element for use in an anti-glare device, according to the preamble of the further independent claim.
  • EMC electromagnetic compatibility
  • Modern anti-glare devices which are used, for example, as viewing windows for welding protection masks, helmets and glasses, typically contain at least one liquid crystal cell (liquid crystal cell, LC cell) as an active filter element, which more or less blocks the passage of light as soon as the outside light intensity exceeds a predetermined threshold.
  • a light sensor is used to detect the light intensity.
  • An electronic circuit in the anti-glare device comprises an evaluation circuit for the sensor output signal and a control circuit for the liquid crystal cell.
  • the light sensor and the evaluation circuit detect so-called flickering light from the welding arc. Since modern welding processes in particular work with very low currents, the signal to be detected has an extremely low signal-to-noise ratio. It is therefore difficult to distinguish the flickering light component from other existing light components and that Extract the signal to be detected from the sensor output signal]
  • the evaluation circuit In order for the evaluation circuit to be able to do so, it must be designed and built very sensitively, ie with high amplification.
  • such sensitive evaluation circuits have the disadvantage that they are also sensitive to electromagnetic interference signals. Interfering electromagnetic influences can occur e.g. caused by radiation from electric motors, from power inverters (e.g. from welding systems), from radio telephones etc.
  • the evaluation circuit should also be electromagnetically shielded from the outside. So far, one has concentrated on the “outside” or “front” of the anti-glare device, ie. to the side facing away from the wearer and towards the environment from which electromagnetic interference signals are mainly expected. A common measure against such interference signals is to only populate the inward-facing surface of the printed circuit board with electronic components and to leave the outward-facing surface unoccupied; at the same time, the unoccupied outer surface of the printed circuit board is provided with electromagnetic shielding means. Such shielding means are typically a fine-mesh grid made of metallic conductor tracks These measures bring certain improvements. However, it has been shown that the EMC shielding achieved in this way is still unsatisfactory for particularly sensitive circuits. It is therefore an object of the invention to better shield the evaluation circuit or parts thereof from electromagnetic interference or interference radiation than has been the case up to now. The object is achieved by the anti-glare device according to the invention and the screening element according to the invention as defined in the independent claims
  • the idea of the invention is based on electromagnetically shielding the electronic components of the evaluation circuit not only on the side of the bare printed circuit board surface (“from the outside”), but also on the side of the printed circuit board surface (“from the inside”). An additional “protection behind the front” is therefore provided. This measure according to the invention brings about significant improvements compared to the “protection on the front” that has been customary up to now.
  • the anti-glare device contains an active filter element with controllable light transmission from an outer half space into an inner half space and electronic components for influencing the filter element, which are attached to at least one surface of a printed circuit board Radiation, which shielding element is attached to the at least one surface of the circuit board
  • the shielding element according to the invention for use in the anti-glare device according to the invention contains electrically conductive material and has a concave shape
  • the invention makes it possible to make the evaluation circuit extremely sensitive without it being excessively disturbed by electromagnetic influences.
  • disturbing electromagnetic influences come from the surroundings of the anti-glare device (“external interaction”).
  • disturbing electromagnetic Influences can also arise in the anti-glare device itself, for example in the control circuit for the LC cell.
  • Today's anti-glare devices use digital components which generate disturbing electromagnetic radiation and also emit it to their surroundings.
  • the LC cell itself can also have undesirable electromagnetic influences on the Exercise evaluation circuit This "internal interaction" is particularly a problem if the glare protection device has to be implemented in a small space.
  • the concept "protection behind the front” according to the invention also enables protection against the internal interaction "This initially unexpected advantage is obviously responsible for the extraordinary effectiveness of the invention
  • the invention even simplifies the evaluation circuit because, thanks to the EMC shielding, certain electronic filter elements can be dispensed with.
  • the shielding protects the circuit not only against electromagnetic radiation, but also against other physical ones and / or protects chemical influences from storages, e.g. against perspiration of the wearer
  • FIGS. 1 is an exploded view of an anti-glare device with a shielded evaluation circuit according to the invention
  • 2 is a top view of the exploded anti-glare device of FIGS. 1 and
  • FIG 3 shows an evaluation circuit shielded according to the invention in a view from the front (a), from the long side (b), from the rear (c) and from the transverse side (d)
  • FIG. 1 and 2 show an exploded view or a top view of an exemplary embodiment of an anti-glare device according to the invention
  • FIG. 3 shows the electronic circuit with an evaluation circuit, shielded according to the invention, of the anti-glare device of FIGS Top view, (c) an inside view and (d) a side view.
  • FIG. 3 shows exemplary dimensions of the parts in millimeters. This exemplary embodiment is explained below with reference to the three figures, the same reference numerals being the same Designate parts
  • the anti-glare device contains, as core piece, an optical block 1 with an active filter element 11, typically comprising at least one liquid crystal cell, which more or less blocks the passage of light from an outer half space 91 into an inner half space 92 through the optical block 1. Furthermore, the anti-glare device includes a printed circuit board 2 and an outer surface 21 of the circuit board 2 is provided with shielding means (not shown), for example a fine-meshed grid made of metallic conductor tracks, for the purpose of shielding against electromagnetic radiation from the outside.
  • An electronic circuit 3 is attached to an inner surface 22 of the circuit board.
  • the electronic circuit 3 can, for example, have two sub-circuits 31, 32, an evaluation circuit 31 and a control circuit 32.
  • a light sensor 5 for detecting the outside light intensity is also mounted on the circuit board a cover plate 51 can be covered.
  • the evaluation circuit 31 is used to evaluate the sensor output signal, the control circuit 32 to control the liquid crystal cell 11 as a function of the sensor output signal.
  • Electrical energy storage devices 6 1, 6 2 such as batteries can be mounted on the printed circuit board 2.
  • photo elements or solar cells 7 1, 7 2 can be provided on the front of the anti-glare device.
  • the anti-glare device preferably includes a cassette consisting of a cassette outer part 81 and a cassette inner part 82, for example made of plastic.
  • the outer part 81 of the cassette is provided with openings 83, 84, 85 1, 85 2 for viewing, for the light sensor 5 or for the solar cells 7 1, 7 2, the inner part 82 of the cassette with an opening 86 for viewing
  • a shielding element 4 according to the invention is attached above the evaluation circuit 31, on the inner surface 22 of the printed circuit board 2. It is shaped in such a way that it covers the evaluation circuit 31 or only parts or components thereof. It preferably has a concave shape in the manner of a hood, so that it can cover electrical and or electronic components such as conductor tracks, contacts, resistors, capacitors, inductors, transistors, integrated circuits etc.
  • the shielding element 4 essentially comprises one Rectangular plate 41 with a surface of approx. 35x9 mm 2 and a thickness of approx. 0 5 mm, and at least partially protruding edges 42 of approx. 1.5 mm high, which are arranged along the circumference of the plate 41.
  • edges 42 are on the inner surface 22 attached to the printed circuit board 2 and preferably irreversibly connected to it, e.g. by soldering, gluing, spot welding, ultrasonic welding, mechanical friction etc.
  • the shielding element 4 can be reversibly attached to the printed circuit board 2, as required removed again and possibly on be reinstalled elsewhere
  • the shielding element 4 must contain electrically conductive material in order to keep electromagnetic interference such as a Faraday cage away from the evaluation circuit 31. It can consist, for example, of metal, of plastic metallized on one surface, of plastic mixed with metal particles, of flexprint (ie a plastic film on which electrical conductor tracks are applied) etc.
  • Shielding elements 4 made of metal can be made, for example, of copper, brass, galvanized sheet metal, ⁇ -metal (ie a ferromagnetic foil, for example of Fe ⁇ N oB ⁇ (atom%)) or from mixtures thereof.
  • ⁇ -metal ie a ferromagnetic foil, for example of Fe ⁇ N oB ⁇ (atom%)
  • PVC or Stat-Kon® RC-1006 manufactured by LNP Engineering Plastics Inc., Exton, PA
  • Suitable materials for metallizing plastic for shielding elements 4 are, for example, aluminum, copper, tin or mixtures thereof.
  • the shielding element 4 can be produced as a film, injection molded part, molded part or stamped and bent part.
  • the shielding element 4 is electrically connected to electrically conductive elements on the printed circuit board 2 and its electrical potential is applied to its neutral conductor (ground). Capacitive influences are also shielded in this way.
  • the shielding element 4 is connected to the printed circuit board 2, for example by soldering, gluing with conductive adhesive, spot welding, ultrasonic welding, mechanical friction, etc.
  • the electronic circuit 3 or parts thereof could be attached to the outside of the printed circuit board 2 and shielded with a shielding element 4 according to the invention.
  • the printed circuit board 2 can be rigid or also flexible, that is to say designed as a film printed circuit board; at a flexible printed circuit board 2, a flexible shielding element 4, for example made of a film, is preferably used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne un dispositif anti-éblouissement comprenant un élément filtrant actif (11) à transmission de lumière influençable, par exemple une cellule à cristal liquide. Le dispositif anti-éblouissement selon l'invention comporte également un circuit électronique (3) évaluant le signal de sortie d'un capteur de lumière (5) et commandant l'élément filtrant (11) ; ce circuit (3) est placé sur la face intérieure (22) d'une plaque de circuit imprimé (2). Un élément de blindage (4) en matériau électroconducteur servant à protéger une partie (31) du circuit électronique (3) contre le rayonnement électromagnétique est également fixé à cette face intérieure (22). Grâce à cet élément de blindage (4), le circuit d'évaluation (31) est extrêmement sensible sans pour autant être exagérément perturbé par des influences électromagnétiques. En effet, cet élément de blindage (4) protège le circuit d'évaluation (31) aussi bien des influences électromagnétiques perturbatrices provenant de l'environnement (91) du dispositif anti-éblouissement que de celles générées dans le dispositif anti-éblouissement lui-même.
EP00958078A 1999-09-29 2000-09-15 Dispositif anti-eblouissement Withdrawn EP1217974A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH01793/99A CH697842B1 (de) 1999-09-29 1999-09-29 Blendschutzvorrichtung.
CH179399 1999-09-29
PCT/CH2000/000497 WO2001022906A1 (fr) 1999-09-29 2000-09-15 Dispositif anti-eblouissement

Publications (1)

Publication Number Publication Date
EP1217974A1 true EP1217974A1 (fr) 2002-07-03

Family

ID=4218732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958078A Withdrawn EP1217974A1 (fr) 1999-09-29 2000-09-15 Dispositif anti-eblouissement

Country Status (5)

Country Link
US (1) US6796652B1 (fr)
EP (1) EP1217974A1 (fr)
CH (1) CH697842B1 (fr)
TW (1) TW541174B (fr)
WO (1) WO2001022906A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6881939B1 (en) 2001-05-05 2005-04-19 Jackson Products, Inc. Microprocessor based automatically dimmable eye protection device
FR2879762B1 (fr) * 2004-12-17 2007-02-23 Optogone Sa Materiau a base de cristal liquide destine a la realisation d'un dispositif d'obturation electro-optique et dispositif incluant un tel materiau
EP1880192A4 (fr) * 2005-05-13 2011-06-15 Univ New York State Res Found Detecteur d'eblouissement de faible puissance
US20070056073A1 (en) * 2005-09-09 2007-03-15 Martin Edward L Modular auto-darkening welding filter
US20070218217A1 (en) * 2006-03-17 2007-09-20 Primal Fernando Adjustably opaque film for substantially smooth surface
DE102006003474B3 (de) * 2006-01-25 2007-07-05 Atmel Germany Gmbh Vorrichtung zum Übertragen elektromagnetischer Signale und deren Verwendung
FR2914755B1 (fr) * 2007-04-03 2009-12-04 Groupe Ecoles Telecomm Procede de fabrication d'une cellule electro-optique a base de psflc et/ou psaflc, cellule electro-optique, dispositif et casque correspondants

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5751258A (en) * 1991-03-25 1998-05-12 Osd Envizion, Inc. Liquid crystal lens driver electronics for eye protection, high speed shuttering with consistent performance
US5940150A (en) * 1991-11-27 1999-08-17 Reveo, Inc. Electro-optical glazing structures having total-reflection and transparent modes of operation for use in dynamical control of electromagnetic radiation
CH687909A5 (de) * 1991-12-31 1997-03-27 Xelux Holding Ag Verfahren zum Betrieb einer Blendschutzvorrichtung.
GB9211427D0 (en) * 1992-05-29 1992-07-15 Crystalens Ltd Liquid crystal lens circuit
US5377032A (en) * 1993-02-05 1994-12-27 Osd Envizion Company Electro-optic light shutter and frame assembly with integrated switching mechanism
AU721435B2 (en) * 1996-03-13 2000-07-06 Fujitsu General Limited Electromagnetic wave leakage preventing filter
FI963872A7 (fi) * 1996-09-27 1998-03-28 It Innovations Finland Oy Suojaväline sähkölaitteen suojaamiseksi ympäristöolosuhteilta
KR100290543B1 (ko) * 1998-12-29 2001-05-15 허문영 온도 보상 눈부심 방지장치 및 그 방법

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0122906A1 *

Also Published As

Publication number Publication date
TW541174B (en) 2003-07-11
US6796652B1 (en) 2004-09-28
CH697842B1 (de) 2009-02-27
WO2001022906A1 (fr) 2001-04-05

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