EP0988010A1 - Dispositif electrooptique actif de filtrage - Google Patents

Dispositif electrooptique actif de filtrage

Info

Publication number
EP0988010A1
EP0988010A1 EP98923968A EP98923968A EP0988010A1 EP 0988010 A1 EP0988010 A1 EP 0988010A1 EP 98923968 A EP98923968 A EP 98923968A EP 98923968 A EP98923968 A EP 98923968A EP 0988010 A1 EP0988010 A1 EP 0988010A1
Authority
EP
European Patent Office
Prior art keywords
filter
active
light
protection
filter 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Withdrawn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
EP98923968A
Other languages
German (de)
English (en)
Inventor
Franco Del Bon
Philipp Syr
Leo Keller
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 EP0988010A1 publication Critical patent/EP0988010A1/fr
Withdrawn legal-status Critical Current

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
    • A61F9/04—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

Definitions

  • the invention relates to an active electro-optical filter device, in particular as a glare protection device for use in welding protection masks, helmets or goggles, with a light protection filter with at least one active optical filter element, with electronics for controlling the at least one active filter element, with 5 interacting with the electronics Light sensor, with a power supply, in particular a solar cell, for the electronics and the at least one active filter element
  • Anti-glare devices of this type are, for example, from WO 96/10767 and EP-A 0 678 288
  • LC cell liquid crystal cell
  • the filter devices described in the cited documents are designed as so-called “monoblocks", ie they consist physically of a single component which contains all the functional elements of the filter device.
  • the functional elements are cast into a thin plate and are thus protected from environmental influences
  • As a thin plate-shaped monoblock physical compatibility with the common passive light protection filters (dark glasses) is achieved, so that the filter device can be exchanged directly for such passive light protection filters.
  • This makes it possible to easily use anti-glare devices equipped with passive light protection filters with the more effective and more advantageous active ones to upgrade electro-optical filter devices
  • a first aspect of the present invention is intended to eliminate this disadvantage and to improve the economy and variety of possible uses of an active electro-optical filter device of the generic type
  • the light protection filter is arranged in a filter unit and the electronics, the light sensor and the power supply are arranged in a physically separate control unit, the filter unit and the control unit being detachably mechanically and electrically together to form an overall unit connectable and equipped with mutually interacting mechanical and electrical connecting elements
  • the filter unit containing the light protection filter and the control unit containing the electronics, the light sensor and the power supply are each designed as a potted plate with a constant thickness of in particular 1-5 mm, the filter unit and control unit also being able to have different thicknesses
  • the filter device is therefore divided into two (or more) separate structural units which are detachably connected to one another.
  • This division means that if one functional element fails, only the corresponding structural unit needs to be replaced. and filter units have greater design flexibility, since, for example, one and the same control unit can be used together with different filter units. This results in considerable practical and economic advantages not only in use, but also in production
  • the conventional filter devices described in the publications mentioned at the beginning consist of active and passive filter elements with optical polarizers, which offer adequate protection against ultraviolet, visible and infrared radiation, and their design, in normal cases, complies with common product standards such as EN 379 (90x35mm). and EN 166 (96x25mm) designed viewing window These viewing windows, especially if they use certain, optically anisotropic technologies or are installed in an unfavorable position in an anti-glare cassette and welding protection mask, are in the human eye perception - J
  • protective devices should enable physiologically undisturbed vision.
  • Physiologically undisturbed vision facilitates spatial vision, thus ensuring a sufficient sense of balance and maintaining protection from approaching objects are better recognized and thus facilitate your own actions
  • electro-optical filter devices When used as an anti-glare device, electro-optical filter devices must be designed in such a way that the temporal and local occurrence is minimally influenced by the filter device in terms of the effect on the eyes.This can only be ensured if the geometric dimensions of the filter and its physical properties only determine the information change and limit
  • the visual angle is thus determined by means of optically active or passive phase delay elements (so-called optical retarder). compensated for the intensity of the light transmitted through the active optical filter element in order to obtain a more homogeneous intensity distribution that is less dependent on the viewing angle.
  • the light protection filter is equipped with a field of view that is adapted to natural visual perception.
  • the combination of these two measures that is to say the homogenization of the light distribution for both eyes in any shape and size of the filter device through the use of active and / or passive ones optical retarder and the enlargement of the lateral (lateral) field of view of the filter device, in the filter device according to the invention, helps to meet the need for better visual perception under extreme light conditions, such as, for example, in electric welding
  • FIG. 1 shows a first example of the inventive filter device with separate control and filter assemblies
  • FIG. 2 is a side view along the line II-II of FIG. 1,
  • ig 3 is a second example of a nutshell with two filter assemblies
  • FIG. 6 shows a further exemplary embodiment, similar to FIG. 3, but with filter units arranged at an angle to the control unit,
  • ig 7 is a filter assembly of cylindrical curvature
  • ig 8 is a spherically curved filter assembly
  • ig 9 is a sketch to explain the internal structure of one in the or
  • ig 10-11 isocontrast diagrams to explain the mode of operation of the compensation element contained in the light protection filter
  • Fig. 12-13 two sketches to explain the geometric relationships and the field of view size of the light protection filter
  • the active electro-optical filter device designated as a whole by F in FIG. 1 comprises, as shown, two separate structural units, namely a control unit SE and a filter unit FE, which are each designed as thin plates with a thickness of approximately 1-5 mm.
  • the two units are molded.
  • the thickness of the plates of the filter unit FE and the control unit SE can be different
  • the filter assembly FE there is a light protection filter 1 which essentially comprises an active optical filter element 21 and its associated passive filter elements, such as in particular UV and IR filters and upstream and downstream polarization filters 22 and 23.
  • the active filter element 21 is preferably designed as a liquid crystal cell (LC cell).
  • the light protection filter 1 also contains at least one optically active or passive compensation element 24 to improve its homogeneity of light transmission, which is dependent in particular on the viewing angle.
  • the detailed structure of the light protection filter 1 can be seen in FIG. 9 and will be described further below explained in more detail
  • the light protection filter 1 can also have a plurality of active optical filter elements and, accordingly, a number of associated passive filter elements and also a number of active or passive compensation elements
  • the control module SE comprises control electronics 2, a light sensor 4 interacting with it and a power supply, which in turn comprises a solar cell 5 and two rechargeable battery cells 6 and 7.
  • a power supply which in turn comprises a solar cell 5 and two rechargeable battery cells 6 and 7.
  • the power supply can also be implemented differently, for example only with one or more solar cells or only with one or more battery cells
  • the control unit SE is provided with mechanical and electrical connecting elements 8, 9 and 10, which interact with complementary mechanical and electrical connecting elements 11, 12 and 13 on the filter unit FE in such a way that the control and filter unit can be mechanically and electrically detachably connected to one another in the exemplary embodiment shown the connecting elements form a plug connection, but other types of connection are also possible.
  • the filter device F is shown in the assembled state
  • the battery cells 6 and 7 can be charged by the solar cell 5 via the control electronics 2 or serve as a safety backup system. If the light sensor 4 hits a predetermined intensity threshold, the control electronics 2 generates a control signal for the active electro-optical filter element 1, whereby this becomes more or less opaque. Conversely, the active filter element becomes transparent again when the light sensor 4 is no longer exposed to light of sufficient intensity
  • the filter device for example in accordance with FIG. 3 or FIG. 6, can be provided with two or more filter structural units FE, possibly also of different sizes, which each interact with the same control structural unit SE.
  • the filter structural units In this case, FE can also be arranged at a mutual distance, as in normal eyeglasses
  • the two structural units SE and FE are in the assembled state in one plane and thus externally result in a filter device analogous to WO 96/10767, without however having their specific disadvantages.
  • the structural units SE and FE can also be so be designed so that they are in the assembled state in two mutually parallel planes, as is shown in simplified form in FIG. 4.
  • the control unit SE and the filter units FE can also be assembled at an angle to one another, as is shown in FIG. 6
  • the filter assemblies FE can be designed as flat plates ( Figures 1-6) or spatially curved ( Figures 7 and 8) By dividing the filter device into two or more units, they are smaller and can be manufactured with less construction effort, stiff and self-supporting.Furthermore, they can be made thinner and correspondingly lighter.It is also easier and easier to achieve dimensional adjustment to existing conditions - in the case of one Anti-glare mask, for example, can bring the filter units closer to the eye
  • control module SE can also be designed in such a way that it is intended to remain essentially stationary in the context of an anti-glare device, for example a welding mask. In this case, only the filter module FE can be easily replaced
  • An essential aspect of the present invention consists in the compensation measures for the transmission properties dependent on the viewing angle and thus inhomogeneous intensity distribution of the at least one active filter element 21 in the form of an LCD.
  • This compensation is carried out by means of an optically active or passive compensation element which detects the phase behavior of the
  • the electromagnetic field vector is influenced in every spatial direction in such a way that a homogenization of the local and angle-dependent radiation distribution is achieved through the light protection filter.
  • Active or passive phase retardation elements are particularly suitable as compensation elements.
  • Passive phase compensation foils resistive phase compensation foils (retarder foils, “phase matched bi-axial Compensation Film ”) used.
  • the structure and mode of operation of such compensation elements, in particular retarder films, are known to the person skilled in the art and, for example, in an article by S -T Wu in SLD 95 DIGEST, pp 555-558
  • FIG. 10 shows, in the form of an isocontrast diagram, the transmission properties of a conventional light protection filter without compensation according to the invention. Contrast here is to be understood as the ratio of the transmitted light intensities in the opaque and in the transparent state of the light protection filter.
  • the rectangular field 31 defines a minimum field of view, at according to the standard, a minimum of stereoscopic vision is still possible.
  • Curves 32-35 connect the locations of the same contrast, from the inside out for 1 100, 1 80, 1 50 and 1 10 As you can see, the transmittance is dependent on the viewing angle and extremely inhomogeneous across the field of view 11 shows an analog isocontrast diagram for a light protection filter equipped according to the invention with a compensation element.
  • the minimum field of view is marked by a rectangle 41, the curves 42-44 again connect the locations of the same contrast, from the inside out for 1,100. 1 80 and 1 50 As you can see, the transmittance is now much more homogeneous, and in particular over the entire field of view 41 not less than 1 80. The field of view can therefore be significantly enlarged with this configuration
  • the adaptation of the field of view which is defined, inter alia, by the dimensions of the light protection filter to the natural visual perception, is a further essential aspect of the present invention. Essentially, this relates to the lateral (lateral) field of vision
  • FIGS. 12 and 13 illustrate this.
  • Working point AP is to be understood as the location on which the gaze is concentrated when working, that is, in the case of welding work, the location of the welding arc.
  • the mean eye distance D and the distance r from the working point are practical constant standard sizes (64 mm or 400 mm), so that the approximation formula essentially represents the relationship between the distance d of the light protection filter from the eye, the lateral field of view size S and the field of view constant k.
  • the distance d is at least for the common anti-glare masks around 60 mm
  • the lateral field of view size S is to be understood as the lateral outer dimension of the configuration formed from the two light protection filters (FIG. 3)
  • the geometric conditions of the filter device are now modified so that they satisfy the above relationship, but the value for the field of view constant k is at least 1.15.
  • k is a value greater than 2, especially 2 , 22
  • the last-mentioned value for the field of view constant k results in a lateral field of view size, which ensures optimal stereoscopic vision and thus optimal spatial orientation.
  • the dimensioning of the filter device according to the invention amounts to a relative enlargement of the lateral field of view.
  • the desired effect only arises when the degree of transmission of the light protection filter over this enlarged field of view is sufficiently homogeneous, as explained above, the latter is ensured by the compensation measures according to the invention
  • Electro-optical filter devices available on the market often do not meet these requirements of a larger lateral field of view due to the anti-glare device due to the liquid crystal technology used or as a result of structural deficiency and are possibly limited to the fulfillment of common norms.
  • the present invention enables the realization of a safety-relevant viewing angle range that is optimally adapted to human vision Glare protection device through the combined use of suitable geometrically constructive and optically phase correcting measures, which are used in addition to the light protection filter
  • Optically active and passive delaying measures enable the angle-dependent transmission properties of the electro-optical filter to be influenced in a targeted manner to improve the binocular visual impression, the maximum possible resolution and the spatial perception by the visual apparatus
  • the filter device according to the first aspect of the invention described above By dividing the filter device according to the first aspect of the invention described above into two or more separate, detachably interconnected units, these are smaller and can be made self-rigid and self-supporting with less design effort.Furthermore, they can be made thinner and correspondingly lighter. Moreover, it is easier and It is easier to achieve dimensional adjustment to existing conditions - in the case of an anti-glare mask, for example, the filter units can be brought closer to the eye. Furthermore, if one of the functional elements fails, only the corresponding unit needs to be replaced

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Ophthalmology & Optometry (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Blocking Light For Cameras (AREA)

Abstract

Ce dispositif électrooptique actif de filtrage, utile notamment comme dispositif anti-éblouissant dans des masques, casques ou lunettes protecteurs pour soudeurs, est pourvu de manière connue en soi d'un filtre de protection contre la lumière avec au moins un élément optique actif de filtrage (1) et des éléments électroniques (2) de commande du ou des éléments actifs de filtrage, ainsi que d'un détecteur de lumière (4) qui coopère avec les éléments électroniques et d'une alimentation des éléments électroniques et du ou des éléments actifs de filtrage en courant (5-7), notamment une cellule solaire. Afin de rendre ce dispositif plus économique à produire et à utiliser, le filtre (1) de protection contre la lumière se situe dans un module de filtrage (FE) et les éléments électroniques (2), le détecteur de lumière (4) et l'alimentation en courant (5-7) se situent dans une unité de commande séparée (SE). Le module de filtrage (FE) et l'unité de commande (SE) peuvent être mécaniquement et électriquement reliés de manière amovible de façon à former une unité (F). A cet effet, ils sont pourvus d'éléments de liaison mécanique et électrique (8-13) qui coopèrent les uns avec les autres. Afin de donner à l'utilisateur pendant son travail une visibilité aussi peu dérangée physiologiquement que possible dans toutes les directions possibles du regard à travers l'élément de filtrage et de satisfaire ainsi les exigences fondamentales de sécurité, telles qu'une vision spatiale améliorée, une sensation d'équilibre non perturbée et la reconnaissance d'objets qui s'approchent, le filtre (1) de protection contre la lumière comprend au moins un élément compensateur optique actif ou passif, par exemple une feuille de déphasage optique ou un filtre électrooptique, afin d'améliorer notamment l'homogénéité de la transmission de lumière dépendante de l'angle d'observation. Le filtre (1) de protection contre la lumière est en outre pourvu d'un champ de vision adapté aux sensations visuelles naturelles.
EP98923968A 1997-06-18 1998-06-12 Dispositif electrooptique actif de filtrage Withdrawn EP0988010A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
CH148897 1997-06-18
CH148797 1997-06-18
CH148797 1997-06-18
CH148897 1997-06-18
PCT/CH1998/000258 WO1998057606A1 (fr) 1997-06-18 1998-06-12 Dispositif electrooptique actif de filtrage

Publications (1)

Publication Number Publication Date
EP0988010A1 true EP0988010A1 (fr) 2000-03-29

Family

ID=25687799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98923968A Withdrawn EP0988010A1 (fr) 1997-06-18 1998-06-12 Dispositif electrooptique actif de filtrage

Country Status (6)

Country Link
US (1) US6270223B1 (fr)
EP (1) EP0988010A1 (fr)
JP (1) JP2002511798A (fr)
AU (1) AU7634898A (fr)
TW (1) TW390808B (fr)
WO (1) WO1998057606A1 (fr)

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US6614409B1 (en) * 1999-11-23 2003-09-02 Otos Co., Ltd. Glare shielding device of welding helmet and method of controlling the same
US6934967B2 (en) * 2000-11-09 2005-08-30 3M Innovative Properties Company Welding operation liquid crystal protection mask
DE50106550D1 (de) * 2000-12-21 2005-07-21 Optrel Ag Wattwil Blendschutzvorrichtung für schweisserschutzmasken
US6841772B1 (en) * 2001-05-05 2005-01-11 Jackson Products, Inc. Eye-protection device having dual high voltage switching
TW569036B (en) * 2001-05-07 2004-01-01 Reveo Inc Glare blocking device
US6697658B2 (en) 2001-07-02 2004-02-24 Masimo Corporation Low power pulse oximeter
US6636357B2 (en) 2002-01-30 2003-10-21 Hewlett-Packard Development Company, L.P. Electrically variable optical filter
US7150047B2 (en) * 2003-07-02 2006-12-19 Lightswitch Safety Systems, Inc. Indicator layout on an auto-darkening lens for use in welding
WO2005116754A2 (fr) * 2004-05-21 2005-12-08 Niel Mazurek Ensemble miroir a intensite reglable et a commande pneumatique
EP1860993B1 (fr) 2005-03-01 2019-01-23 Masimo Laboratories, Inc. Moniteur patient multiparametrique non invasif
US8990963B2 (en) 2006-08-23 2015-03-31 Lincoln Global, Inc. User-friendly welding helmet assembly
US8577431B2 (en) 2008-07-03 2013-11-05 Cercacor Laboratories, Inc. Noise shielding for a noninvasive device
US8630691B2 (en) 2008-08-04 2014-01-14 Cercacor Laboratories, Inc. Multi-stream sensor front ends for noninvasive measurement of blood constituents
AU2011336908B2 (en) 2010-12-01 2015-02-05 3M Innovative Properties Company Welding helmet having a filter arrangement
CN106324695B (zh) * 2016-08-24 2018-10-12 合肥凌翔信息科技有限公司 一种探测用自由游动仿生鱼
EP3607923A1 (fr) * 2018-08-10 2020-02-12 Optrel Holding AG Procédé de fonctionnement d'un dispositif de protection contre l'éblouissement

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Also Published As

Publication number Publication date
WO1998057606A1 (fr) 1998-12-23
TW390808B (en) 2000-05-21
US6270223B1 (en) 2001-08-07
JP2002511798A (ja) 2002-04-16
AU7634898A (en) 1999-01-04

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