EP0657111A1 - Augenschirm mit veränderlicher Lichtdurchlässigkeit für Kopfbedeckung - Google Patents

Augenschirm mit veränderlicher Lichtdurchlässigkeit für Kopfbedeckung Download PDF

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Publication number
EP0657111A1
EP0657111A1 EP94402802A EP94402802A EP0657111A1 EP 0657111 A1 EP0657111 A1 EP 0657111A1 EP 94402802 A EP94402802 A EP 94402802A EP 94402802 A EP94402802 A EP 94402802A EP 0657111 A1 EP0657111 A1 EP 0657111A1
Authority
EP
European Patent Office
Prior art keywords
visor
zone
visor according
pilot
aircraft
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.)
Granted
Application number
EP94402802A
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English (en)
French (fr)
Other versions
EP0657111B1 (de
Inventor
Yves Lefort
Gérard Le Paih
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.)
Thales Avionics SAS
Original Assignee
Thales Avionics SAS
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Filing date
Publication date
Application filed by Thales Avionics SAS filed Critical Thales Avionics SAS
Publication of EP0657111A1 publication Critical patent/EP0657111A1/de
Application granted granted Critical
Publication of EP0657111B1 publication Critical patent/EP0657111B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/18—Face protection devices
    • A42B3/22—Visors
    • A42B3/226—Visors with sunscreens, e.g. tinted or dual visor

Definitions

  • the present invention relates to a head gear visor with variable light transmission. It applies in particular to the fitting of helmets for aircraft pilots. More generally, it applies to protection systems that it is necessary to release the constraints of slow variation in transmission, in particular due to the absorbent element consisting of photochromic agents.
  • a visor fitted to an aircraft pilot's helmet generally has two essential protective functions.
  • a first protection is a facial protection against external mechanical aggressions. This protection is usually provided by an often cylindrical or spherical blade made of transparent thermoplastic material, for example polycarbonate.
  • a second protection is an eye protection against solar radiation
  • the visor can tint or lighten therefore absorb more or less light energy reversibly depending on the ambient light thanks to the presence of chemicals integrated in the thickness or surface of the visor.
  • These substances varying the coloration of the material which they integrate as a function of the luminosity are said to be photochromic.
  • these photochromic substances consist of molecules whose structure changes in a reversible manner under the effect of photons which they receive, this modification causing a change of color.
  • Known and used photochromic substances are for example the families of spiropyrans or spiroxazines.
  • variable transmission visors composed of a transparent thermoplastic strip, the photochromic substance being incorporated during the injection of the part or deposited on the surface with a gun or by molding for example. These visors absorb part of the incident light energy identically at any point of the visor.
  • a plastic based on photochromic substances can have a light transmission in the range of 75% to 85% in the clear state. In the presence of strong light, the plastic reaches a dark state and the transmission can drop to values between 20% and 30% for example.
  • Light and dark transmissions depend on the nature of the photochromic substances used or the composition of the mixture thereof. These transmissions also depend on the respective concentrations of photochromic substances in the thickness or on the surface of the visor.
  • the reaction times of photochromic substances are generally long. These reaction times are of the order of one minute on darkening and several minutes on lightening.
  • a pilot needs a clear visor when the light is low and a dark visor when he meets these intense lighting conditions, when passing over the cloud layer for example.
  • a conventional photochromic visor as defined above does not meet the pilot's need well. It is usually either too light or too dark. due to the aforementioned too long reaction times inherent in the very nature of photochromic substances, it is in particular the transition from the dark state to the light state which occurs too late. This has the effect of hampering the pilot's vision and therefore of reducing his safety.
  • the object of the invention is to overcome the aforementioned drawbacks, in particular by proposing a visor architecture adapted to the work accomplished by the visor wearer, an airplane pilot for example, this architecture making it possible to free the wearer from the aforementioned reaction times.
  • the subject of the invention is a visor of head equipment with variable light transmission, characterized in that the visor comprises at least two different zones of absorption of light, each zone being dedicated to a zone of the outside space swept by the gaze.
  • the main advantages of the invention are that it improves the safety and the comfort of vision of the wearer of the visor, which it allows in the case of a helmet visual with projection of symbols on the visor, an increase in the contrast of the image projected inside the visor, thus improving the readability of information, which it is economical and easy to implement.
  • FIG. 1 shows by way of example a pilot 1 wearing a helmet 2 equipped with a visor 3.
  • the pilot is for example in the cockpit 4 of an airplane 5 of which only the front part is shown.
  • the pilot must be able to look at the exterior of the aircraft and the on-board instruments 6 with the greatest possible comfort. In particular, it should not be bothered by intense light rays.
  • the structure of the visor according to the invention uses the fact that all the parts of the visor are not functionally identical.
  • the visor according to the invention then comprises at least two zones of different absorption of light, that of higher absorption corresponding to the part of the visual field of the wearer which requires a less good perception than the part of absorption the lowest .
  • the first part corresponds for example to the view of the exterior of the airplane and the second part to the view of the on-board instruments.
  • the transition speeds are different from one zone to another, that is to say that the reaction speeds of photochromic substances or LCD materials are different from one zone to the other.
  • the variation of the transmission is then more or less rapid from one zone to another.
  • Variable transmission can be ensured by a combination of photochromic and LCD technologies to obtain different transition speeds from one zone to another.
  • FIG. 2 illustrates the principle of producing a visor according to the invention fitted to the pilot shown in FIG. 1.
  • the visor 3 is broken down into two zones 31, 32 corresponding to vertical viewing angles ⁇ 1 and ⁇ 2 swept by the gaze of the pilot 1 and originating from the eye 7 of the pilot 1 by example.
  • the direction chosen as the origin for the pilot's gaze is for example the direction 8 seen by the eye 7 when the latter is at rest.
  • the upper zone 31 of the visor corresponds to an angle ⁇ 1 between a first angle ⁇ H and a second angle ⁇ HB taken relative to the original direction 8 and the lower zone 32 corresponds to an angle ⁇ 2 between the second ⁇ HB and a third angle ⁇ B taken with respect to the origin direction 8.
  • ⁇ H can be equal to + 70 °, ⁇ HB at -25 ° and ⁇ B at -35 °.
  • the upper zone 31 of the visor 3 corresponds to a viewing angle of between + 70 ° above and -25 ° below the original direction 8 and that the low zone 32 of the visor 3 corresponds to a viewing angle between -25 ° and -35 ° below the original direction 8.
  • the upper zone 31 is used, for example, essentially to look outside the aircraft. This part in particular provides good protection against solar radiation.
  • the low zone 32 must for example remain lighter than the high zone 34 even in the event of intense light radiation. Indeed, in all circumstances but especially when the pilot passes from a sunny space to a dark space where visibility is reduced, he needs to consult his on-board instruments. It is then the lower zone 32 of the visor which is stressed. The pilot also needs a good perception of colors to read the symbols appearing on the screens and other on-board indicators 6. It is therefore harmful for the pilot that reaction times too long for the passage to lightening of the visor disturbs his reading of the on-board instruments.
  • photochromic substances and their concentration are then made for example so as to promote a high absorption in the upper zone 31 of the visor.
  • the transmission range of this zone can for example vary between 75% and 20%, from the light state to the dark state.
  • the invention has an additional advantage because it allows an increase in the contrast of the image projected inside the visor 3 on its upper zone 31. The readability of the information is thus greatly increased.
  • the choice of photochromic substances is such that, for example, this zone absorbs less light than the upper zone 31 and that its range of light transmission is reduced relative to this zone high.
  • the transmission range of the low zone 32 can for example vary between 85% and 40% from the light state to the dark state.
  • the photochromic substances of the low region 32 are, for example, also chosen so as to increase the reaction rates and to obtain as neutral as possible attenuation of the colors over the entire visible spectrum to promote a good perception of the on-board indicators and cathode-ray screens. visualization for example.
  • the absorption means used in the visor according to the invention can for example be photochromic substances as described above, or any other type of absorbent.
  • the visor can be broken down into more than two areas.
  • a zone dedicated to the reading of specific indicators such as for example a head-up display console requiring in particular a good appreciation of the color of certain symbols.
  • the arrangement of the zones may not be distributed from top to bottom, but also for example from right to left, in the case in particular where the constraints of reaction time are superimposed on problems of appreciation of colors or shapes according to zones. well-defined spaces surrounding the pilot.
  • the application of the visor according to the invention has been presented for an airplane pilot, however it can be used for other applications, in particular for pilots of all types of aircraft.

Landscapes

  • Helmets And Other Head Coverings (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Liquid Crystal (AREA)
EP94402802A 1993-12-10 1994-12-06 Augenschirm mit veränderlicher Lichtdurchlässigkeit für Kopfbedeckung Expired - Lifetime EP0657111B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9314870A FR2713449B1 (fr) 1993-12-10 1993-12-10 Visière d'équipement de tête à transmission variable.
FR9314870 1993-12-10

Publications (2)

Publication Number Publication Date
EP0657111A1 true EP0657111A1 (de) 1995-06-14
EP0657111B1 EP0657111B1 (de) 1999-05-12

Family

ID=9453806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94402802A Expired - Lifetime EP0657111B1 (de) 1993-12-10 1994-12-06 Augenschirm mit veränderlicher Lichtdurchlässigkeit für Kopfbedeckung

Country Status (8)

Country Link
US (1) US5640711A (de)
EP (1) EP0657111B1 (de)
JP (1) JPH07267194A (de)
CA (1) CA2137619A1 (de)
DE (1) DE69418434T2 (de)
ES (1) ES2132360T3 (de)
FR (1) FR2713449B1 (de)
IL (1) IL111726A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742636A1 (fr) * 1995-12-26 1997-06-27 Sextant Avionique Casque a dispositif de vision nocturne a securite et ergonomie optimisees
US6195206B1 (en) 1998-01-13 2001-02-27 Elbit Systems Ltd. Optical system for day and night use
WO2007031892A1 (en) * 2005-09-15 2007-03-22 Koninklijke Philips Electronics N.V. Optical filter

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742230B1 (fr) * 1995-12-12 1998-01-09 Sextant Avionique Accelerometre et procede de fabrication
SE514273C2 (sv) * 1999-05-11 2001-01-29 Peltor Ab Skyddsvisir
US20110209319A1 (en) * 2003-12-05 2011-09-01 Williams Scott M Photosensitive cockpit windshield
US7328998B2 (en) 2006-05-31 2008-02-12 Hobbs Raymond L Specially tinted lenses for sunglasses for use during flying
NL1033103C2 (nl) * 2006-12-21 2008-06-24 Hd Inspiration Holding B V Vizier voorzien van UV gevoelig materiaal.
ITVI20090262A1 (it) * 2009-10-29 2011-04-30 Roberto Anzolin Casco protettivo perfezionato
IL213727A (en) 2011-06-22 2015-01-29 Elbit Systems Ltd A display system installed on a helmet suitable for bright ambient lighting conditions
IL235088A (en) 2014-10-07 2017-06-29 Elbit Systems Ltd Helmet system with variable light transmission coefficient
US20230350114A1 (en) * 2022-04-27 2023-11-02 Hamilton Sundstrand Corporation Photochromatic transition glass for a helmet of a space suit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2815508A (en) * 1954-11-15 1957-12-10 Leonard P Frieder Helmet with retractable eye shield
FR2394261A1 (fr) * 1977-06-16 1979-01-12 Gonichon Pascal Nouveau pare-brise pour casque tel que de motocycliste
EP0099524A2 (de) * 1982-07-10 1984-02-01 Heinz Dr. Kunert Augenvorsatzscheibe, insbesondere für Kraftfahrzeuglenker
DE4106019A1 (de) * 1990-03-02 1991-10-02 Neta Holland Lichtdurchlaessiges fenster und dessen elektro-optische steuerung
JPH04245904A (ja) * 1991-01-29 1992-09-02 Suzuki Motor Corp ヘルメット用調光シールド

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4080051A (en) * 1976-03-18 1978-03-21 American Optical Corporation Preparation of photochromic gradient lenses of cosmetically improved color
US4482326A (en) * 1982-01-26 1984-11-13 Instrument Flight Research Inc. Flight training glasses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2815508A (en) * 1954-11-15 1957-12-10 Leonard P Frieder Helmet with retractable eye shield
FR2394261A1 (fr) * 1977-06-16 1979-01-12 Gonichon Pascal Nouveau pare-brise pour casque tel que de motocycliste
EP0099524A2 (de) * 1982-07-10 1984-02-01 Heinz Dr. Kunert Augenvorsatzscheibe, insbesondere für Kraftfahrzeuglenker
DE4106019A1 (de) * 1990-03-02 1991-10-02 Neta Holland Lichtdurchlaessiges fenster und dessen elektro-optische steuerung
JPH04245904A (ja) * 1991-01-29 1992-09-02 Suzuki Motor Corp ヘルメット用調光シールド

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 017 (C - 1016) 13 January 1993 (1993-01-13) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742636A1 (fr) * 1995-12-26 1997-06-27 Sextant Avionique Casque a dispositif de vision nocturne a securite et ergonomie optimisees
EP0783843A1 (de) * 1995-12-26 1997-07-16 Sextant Avionique Helm mit Nachtsichtvorrichtung und optimierter Sicherheit und Ergonomie
US5822126A (en) * 1995-12-26 1998-10-13 Sextant Avionique Helmet with night-vision device providing optimized safety and ergonomy
US6195206B1 (en) 1998-01-13 2001-02-27 Elbit Systems Ltd. Optical system for day and night use
WO2007031892A1 (en) * 2005-09-15 2007-03-22 Koninklijke Philips Electronics N.V. Optical filter

Also Published As

Publication number Publication date
DE69418434D1 (de) 1999-06-17
FR2713449B1 (fr) 1996-01-05
US5640711A (en) 1997-06-24
DE69418434T2 (de) 1999-10-07
EP0657111B1 (de) 1999-05-12
CA2137619A1 (fr) 1995-06-11
ES2132360T3 (es) 1999-08-16
JPH07267194A (ja) 1995-10-17
IL111726A0 (en) 1995-01-24
FR2713449A1 (fr) 1995-06-16
IL111726A (en) 1997-06-10

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