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WO1992016867A1 - Systeme d'affichage sur casque et casque ainsi equipe - Google Patents

Systeme d'affichage sur casque et casque ainsi equipe Download PDF

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Publication number
WO1992016867A1
WO1992016867A1 PCT/NL1992/000050 NL9200050W WO9216867A1 WO 1992016867 A1 WO1992016867 A1 WO 1992016867A1 NL 9200050 W NL9200050 W NL 9200050W WO 9216867 A1 WO9216867 A1 WO 9216867A1
Authority
WO
WIPO (PCT)
Prior art keywords
helmet
optically transparent
image projection
reflecting optical
projection 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.)
Ceased
Application number
PCT/NL1992/000050
Other languages
English (en)
Inventor
Bob Kruizinga
Inga Francisca Eduarda Moelans
Godelieve Ghislena Anna Augusta De Vos
Guido Lodewijk Maria Leo Brandt
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.)
Optische Industrie de Oude Delft NV
Original Assignee
Optische Industrie de Oude Delft NV
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
Priority claimed from NL9100442A external-priority patent/NL9100442A/nl
Priority claimed from NL9100777A external-priority patent/NL9100777A/nl
Priority claimed from NL9100776A external-priority patent/NL9100776A/nl
Application filed by Optische Industrie de Oude Delft NV filed Critical Optische Industrie de Oude Delft NV
Publication of WO1992016867A1 publication Critical patent/WO1992016867A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted

Definitions

  • the invention relates to a display system designed for mounting on a helmet, which display system comprises at least an image projection device for attachment to one side of the helmet, and a visor provided with at least one optically transparent, reflecting optical element, which reflecting optical element is designed to receive the image emitted by the image projection device and to render it visible for the wearer of the helmet.
  • Such a display system is known from the paper by R.J. Witherington entitled “Optical design of a holographic visor helmet mounted display” in SPIE, vol. 147, Computer Aided Optical Design (1978), pages 161-170, in particular Fig 1.
  • Such a display system in which an image projection device is fitted at both sides of the helmet at the level of the helmet wearer's chin and in which the optically trans ⁇ parent, reflecting optical element consists of two holographic optical elements which each receive the image intended for an eye of the helmet wearer, is disclosed by a paper by H.-D.V. B ⁇ hm and R. Schranner entitled “Requirements of an HMS/D for a Night-Flying Helicopter” in SPIE, vol. 1290, Helmet Mounted Displays (1990), pages 93- 107, in particular Fig. 6.
  • Such display systems are used "-for the helmets of pilots of, in particular, military aeroplanes and helicopters, although civil applications are also expected in the future.
  • the information to be projected may consist of weapon system and flight information and/or information originating from image sensors, such as images obtained from intensified residual light or from thermal infrared radiation.
  • a pilot who is wearing such a helmet is able to fly with it in twilight and darkness and does not in principle need to avert his eyes from the surroundings in order to observe the necessary weapon system and flight information.
  • the information originating from the image sensors is projected onto the optically transparent, reflecting optical element, which is in practice a holographic optical element, on top of the surroundings actually observed.
  • a display system in which the information intended for the pilot is projected directly from one or more image projection devices on the visor has the advantage that no optical elements are situated close to the pilot's eyes. In practice, it is not only found, specifically, to be unpleasant if optical elements are in fact close to the pilot's eyes, but that also implies a safety risk and makes the wearing of (sun)glasses by the pilot impossible.
  • a drawback of the display system described in the abovementioned paper is that very high requirements are imposed on the optical properties of the holographic optical element and of the image projection device because the angle of incidence of the beam of rays originating from the image projection device and the angle of reflection desired for reflection by the holographic optical element to the pilot's eye form, with the normal to the surface of the holographic optical element, an angle which is such that the reflection condition according to which the angle of incidence is equal to the angle of reflection is nowhere near fulfilled.
  • the wearer of the helmet is provided with an optimum image, it is necessary, in embodiments of display systems of the present type, to site the image projection devices far forward with respect to the face of the wearer of the helmet in view of the optical properties of the image projection devices and of the holographic optical elements.
  • the wearer of the helmet finds it disturbing in many cases that he is able to see the image projection devices at the edge of his field of view and that they to some extent impede his field of view in the lateral direction.
  • the siting of the image projection device far forward also has the drawback that the centre of gravity of the helmet is situated far forward, and this is extremely tiring, in particular when the helmet is worn for a fairly long time at a stretch and does not permit a high g loading in military aeroplanes because the head always tends to bend forwards.
  • the object of the invention is to offer solutions to these problems and, for this purpose, it provides a display device of the abovementioned type in which the at least one image projection device is mounted in a plane which extends essentially horizontally through both eyes of the wearer of the helmet and in which measures are either taken which result in the light rays originating from the image projection device, which is sited at one side of the helmet, traversing a path which is directed at the optically transparent, reflecting optical element placed in front of the eye situated at the opposite side of the helmet, or measures are taken which result in the light rays originating from the image projection device, which is sited at one side of the helmet, traversing a path which comprises an optically transparent, reflecting optical auxiliary element mounted in the vicinity of the respective image projection device on or near the visor, or both the abovementioned measures are taken.
  • the .invention also relates to a helmet provided with a display system of the abovementioned type. It is also found that, as a result of said measures, it is possible to site the image projection devices considerably further to the rear with respect to the face of the wearer of the helmet without concessions having to be made at the same time to the quality of the images observed by the wearer.
  • a further embodiment of the invention is characterised in that a flat, optically transparent, reflecting optical element is sited in the path of the light rays originating from the image projection device at one side of the helmet and directed at the optically transparent, reflecting optical element placed in front of the eye situated near the opposite side of the helmet, which flat, optically transparent, reflecting optical element extends in a vertical plane, which vertical plane extends straight forward.
  • the holographic optical element As a result of siting, a flat, optically transparent, reflecting optical element between the eyes, the holographic optical element is able to reflect the image in a direction situated at the other side of the normal to the direction of incidence. As a result of this, the holographic optical element will exhibit many fewer colour errors, and in some cases none at all.
  • the invention also relates to a helmet provided with a display system of the type described above.
  • Figure 1 shows a diagrammatic side view of a helment provided with a known display device
  • Figure 2 shows a diagrammatic front view of a helmet provided with a known display device
  • Figure 3 shows a diagrammatic plan view of the helmet according to Figures 1 and 2, in which the path of a beam of rays is indicated;
  • Figure 4 shows a diagrammatic plan view of a helmet provided with an embodiment of a display device according to the invention, in which the path of a beam of rays is also indicated;
  • Figure 5 shows a diagrammatic front view of a helmet provided with a display device according to Figure 4;
  • Figure 6 shows a diagrammatic plan view of another embodiment of a display device according to the invention
  • Figure 7 shows a diagrammatic plan view of yet another embodiment of a display device according to the invention
  • Figure 8 shows a diagrammatic front view of a further embodiment of a display device according to the invention
  • Figure 9 shows a diagrammatic plan view of a first embodiment of the embodiment according to Figure 8;
  • Figure 10 shows a diagrammatic plan view of a second embodiment of the embodiment according to Figure 8.
  • Figures 1 and 2 show a pilot wearing a helmet 1 which is provided with a visor 2. These igures essentially correspond to Figure 6 of the abovementioned paper by B ⁇ hm and Schranner.
  • Mounted at the left-hand side (as viewed by the wearer of the helmet) of the helmet is an image projection device 3, known per se, which is capable of projecting an image onto a holographic optical element 4 mounted on the inside of the visor 2, which image is intended for the pilot's left eye 7.
  • an image projection device 5 which is capable of projecting an image onto a holographic optical element 6 also mounted on the inside of the visor 2, which image is intended far the pilot's right eye 7', is mounted at the right-hand side of the helmet.
  • Figure 3 shows diagrammatically in plan view the path of a beam of rays 8 emitted by the image projection device 5 and intended for the holographic optical element 6.
  • Figures 4 and 5 show diagrammatically the same view as in Figures 3 and 2, respectively, but a solution according to the invention is indicated therein.
  • the solution shown is that the image projection devices 3 and 5 are mounted on either side of the head of the wearer of the helmet in a plane which extends essen ⁇ tially horizontally through the two eyes of said wearer,, so that little or no deflection of the beam of rays emitted by the image projection device in the vertical direction is necessary, and that the signals which originate from sensors, image pick-ups etc. and which are intended for the pilot's right eye 7' are fed to the image projection device 3 which is situated on the left-hand side of the pilot's head.
  • the image projection device 3 emits a beam of rays 8' in the direction of the holographic optical element 6, which reflects said beam to the eye 7' .
  • the central ray of the beam 8' in the figure now has an angle of incidence with the normal to the holographic optical element which is equal to a' , while the angle of reflection by the holographic optical element 6 to the eye 7' is equal to ⁇ * .
  • a beam of rays emitted by the image projection device 5 and intended for the holographic optical element 4 travels in a corresponding way to the beam emitted by the image pro ⁇ jection device 3 and therefore offers the same advantages, so that this does not therefore require any further explanation.
  • the wearer of the helmet sometimes finds it disturbing that he is able to see the image projection devices 3 and 5 from the corners of his eyes and that these impede his field of view in a lateral direction.
  • two additional optically transparent, reflecting optical auxiliary elements 9 and 10 mounted on or near the visor are provided, and these may again be holographic optical elements or semi-transparent mirror elements.
  • the object of the element 9 is to receive the beam of rays originating from the image projection device 3, which is now sited further to the rear on the helmet, and to reflect it to the element 6 or the element 4, respectively.
  • the element 10 receives a beam of rays, originating from the image projection device 5, in the same way and reflects it to the element 4 or the element 6, respectively.
  • this has the additional advantage that the weight distribution of the equipment mounted on the helmet becomes more favourable, and this is found in practice to be very important.
  • the auxiliary elements 9, 10 can be mounted on the surface of the visor in the same way as the elements 4 and 6, but it is also possible to mount the auxiliary elements 9 and 10 in the immediate vicinity of the visor, and this offers the possibility of giving the auxiliary elements a surface shape which is other than that of the surface of the visor.
  • optically transparent, reflecting optical elements 4, 9 and 6, 10 are shown in both the embodiment according to Figure 4 and in that according to Figures 6 and 7 for each image projection device, it is also possible in principle to use a single continuous holographic optical element or semi-transparent mirror element, of which, in the embodiment according to Figure 4, the right-hand section, seen in plan view, receives the beam originating from the image projection device 3 and intended for the eye 7* and reflects it, and the left-hand section receives the beam originating from the image projection device 5 and intended for the eye 7.
  • the section furthest to the left fulfils the function of the element 9 and the section furthest to the right fulfils that of the element 10.
  • Figures 8 and 9 diagrammatically show a front and plan view of a further embodiment of the invention.
  • the essence of the embodiment shown is that the image projection devices 3 and 5 are mounted on either side of the head of the wearer of the helmet in a plane which extends essentially horizontally through the two eyes of said wearer, so that little or no deflection of the beam of rays emitted by the image projection device is necessary in the vertical direction, and that the signals which originate from sensors, image pick-ups etc. and which are intended for the pilot's right eye 7' are fed to the image projection device 5, which is situated on the right-hand side of the pilot's head.
  • the image projection device 5 emits a beam of rays 8 in the direction of a flat, vertically sited, reflecting element 11, such as an optically transparent holographic element which is situated between the eyes.
  • Element 11 reflects the beam of rays in the direction of the holographic optical element 6, which reflects said beam to the eye 7*.
  • the ray of the beam 8 which is now central in the igure has an angle of incidence with the normal to the holographic optical element which is equal to • , while the angle of reflection by the holographic optical element 6 to the eye 7• is equal to ⁇ ' .
  • a beam of rays emitted by the image projection device 3 travels to the rear side of the element 11, which also acts reflectively, and is then reflected to the holographic optical element 4, which reflects the beam of rays to the left eye 7.
  • the wearer of the helmet may in some cases find it disturbing that he is able to see the image projection devices 3 and 5 out of the corners of his eyes and that they to some extent impede his field of view in the lateral direction.
  • two additional optically transparent, reflecting optical auxiliary elements 9 and 10 which may again be holographic optical elements or semi-transparent mirror elements, are provided which are mounted on or near the visor.
  • the object of the element 9 is to receive the beam of rays originating from the image projection device 3, which is now sited further to the rear on the helmet, and to reflect them to the element 11, which reflects the beam of rays to the element 4.
  • the element 10 receives the beam of rays originating from the image projection device 5 and reflects it to the other side of element 11, which reflects the beam of rays to the element 6.
  • auxiliary elements 9 and 10 can be mounted on the surface of the visor in the same way as the elements 4 and 6, but it is also possible to mount the auxiliary elements 9 and 10 in the immediate vicinity of the visor, and this offers the possibility of giving the auxiliary elements a surface shape which is other than that of the surface of the visor.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

On décrit un système d'affichage pouvant se monter sur un casque comprenant deux dispositifs de projection d'images destinés à être montés de part et d'autre du casque, chacun des dispositifs de projection d'images émettant une image conçue pour être vue par la personne portant le casque. En outre, ledit système comporte une visière munie de deux éléments optiques réfléchissants optiquement transparents, qui reçoivent les images émises par les dispositifs de projection d'images et les réfléchissent vers l'÷il devant recevoir ladite image. Pour rendre moins strictes les exigences imposées concernant les propriétés optiques des éléments optiques, les dispositifs de projection d'images sont montés dans un plan qui s'étend sensiblement horizontalement à travers les deux yeux du porteur du casque, et soit le dispositif de projection d'images émettant l'image réfléchie vers l'÷il gauche est situé du côté droit du casque et le dispositif de projection d'images émettant l'image réfléchie vers l''÷il droit est situé du côté gauche du casque, soit un élément réfléchissant plat optiquement transparent est monté verticalement entre les yeux, ledit élément plat réfléchissant l'image provenant du dispositif de projection d'images du côté gauche ou du côté droit respectivement du casque vers l'élément optique réfléchissant optiquement transparent, selon le cas. Afin de pouvoir situer les dispositifs de projection d'images plus en arrière de manière qu'ils soient totalement hors du champ de vision du porteur du casque, un élément optique auxiliaire réfléchissant optiquement transparent est monté à proximité du dispositif de projection d'images respectif sur la visière ou près de celle-ci, pour réfléchir les rayons provenant du dispositif de projection d'images vers l'élément réfléchissant optiquement transparent associé, ou vers l'élément optique réfléchissant optiquement transparent plat selon le cas.
PCT/NL1992/000050 1991-03-12 1992-03-12 Systeme d'affichage sur casque et casque ainsi equipe Ceased WO1992016867A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
NL9100442 1991-03-12
NL9100442A NL9100442A (nl) 1991-03-12 1991-03-12 Weergeefstelsel voor montage op een helm alsmede een helm voorzien van een dergelijk weergeefstelsel.
NL9100776 1991-05-06
NL9100777A NL9100777A (nl) 1991-05-06 1991-05-06 Weergeefstelsel voor montage op een helm alsmede een helm voorzien van een dergelijk weergeefstelsel.
NL9100776A NL9100776A (nl) 1991-05-06 1991-05-06 Weergeefstelsel voor montage op een helm alsmede een helm voorzien van een dergelijk weergeefstelsel.
NL9100777 1991-05-06

Publications (1)

Publication Number Publication Date
WO1992016867A1 true WO1992016867A1 (fr) 1992-10-01

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Application Number Title Priority Date Filing Date
PCT/NL1992/000050 Ceased WO1992016867A1 (fr) 1991-03-12 1992-03-12 Systeme d'affichage sur casque et casque ainsi equipe

Country Status (1)

Country Link
WO (1) WO1992016867A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5251333A (en) * 1991-10-09 1993-10-12 Nir Tsook Helmet mounted display device
WO1994011773A1 (fr) * 1992-11-10 1994-05-26 Honeywell Inc. Dispositif d'affichage monte sur casque, a visiere a projection croisee
EP0599759A1 (fr) * 1992-11-27 1994-06-01 Sextant Avionique S.A. Dispositif de visualisation monté sur casque
NL1003197C2 (nl) * 1996-05-24 1997-11-25 Optische Ind Oede Oude Delftoe Weergeefstelsel voor het verschaffen van nachtzicht aan piloten.
US5764203A (en) * 1992-12-01 1998-06-09 Kemira Oy Breathing mask with a display unit
JP3438732B2 (ja) 1991-07-19 2003-08-18 セイコーエプソン株式会社 光学装置および表示装置
JP2008009007A (ja) * 2006-06-28 2008-01-17 Shikoku Res Inst Inc 顔面装着型画像視認装置
CN103261944A (zh) * 2010-12-28 2013-08-21 洛克希德马丁公司 采用一个或多个反射光表面的头戴式显示装置
GB2591568A (en) * 2019-12-06 2021-08-04 Bae Systems Plc Binocular optical display system
US12487456B2 (en) 2019-12-06 2025-12-02 Bae Systems Plc Binocular optical display system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633988A (en) * 1970-07-10 1972-01-11 Us Navy Helmet-mounted holographic aiming sight
US4220400A (en) * 1977-02-22 1980-09-02 Honeywell Inc. Display apparatus with reflective separated structure
EP0240374A1 (fr) * 1986-02-04 1987-10-07 Thomson-Csf Collimateur tête haute et son utilisation pour un viseur de casque
EP0286496A1 (fr) * 1987-03-31 1988-10-12 Thomson-Csf Viseur binoculaire, holographique et à grand champ, utilisable sur casque
EP0288365A1 (fr) * 1987-04-22 1988-10-26 Thomson-Csf Viseur clair holographique montable sur casque
EP0324496A2 (fr) * 1988-01-15 1989-07-19 Yeda Research And Development Company, Ltd. Procédé de création des hologrammes, notamment pour des viseurs à affichage holographiques de casque

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3633988A (en) * 1970-07-10 1972-01-11 Us Navy Helmet-mounted holographic aiming sight
US4220400A (en) * 1977-02-22 1980-09-02 Honeywell Inc. Display apparatus with reflective separated structure
EP0240374A1 (fr) * 1986-02-04 1987-10-07 Thomson-Csf Collimateur tête haute et son utilisation pour un viseur de casque
EP0286496A1 (fr) * 1987-03-31 1988-10-12 Thomson-Csf Viseur binoculaire, holographique et à grand champ, utilisable sur casque
EP0288365A1 (fr) * 1987-04-22 1988-10-26 Thomson-Csf Viseur clair holographique montable sur casque
EP0324496A2 (fr) * 1988-01-15 1989-07-19 Yeda Research And Development Company, Ltd. Procédé de création des hologrammes, notamment pour des viseurs à affichage holographiques de casque

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3438732B2 (ja) 1991-07-19 2003-08-18 セイコーエプソン株式会社 光学装置および表示装置
US5251333A (en) * 1991-10-09 1993-10-12 Nir Tsook Helmet mounted display device
WO1994011773A1 (fr) * 1992-11-10 1994-05-26 Honeywell Inc. Dispositif d'affichage monte sur casque, a visiere a projection croisee
EP0599759A1 (fr) * 1992-11-27 1994-06-01 Sextant Avionique S.A. Dispositif de visualisation monté sur casque
FR2700216A1 (fr) * 1992-11-27 1994-07-08 Sextant Avionique Dispositif de visualisation monté sur casque.
US5764203A (en) * 1992-12-01 1998-06-09 Kemira Oy Breathing mask with a display unit
WO1997045760A1 (fr) * 1996-05-24 1997-12-04 B.V. Optische Industrie 'de Oude Delft' Systeme d'imagerie assurant la vision nocturne aux pilotes
NL1003197C2 (nl) * 1996-05-24 1997-11-25 Optische Ind Oede Oude Delftoe Weergeefstelsel voor het verschaffen van nachtzicht aan piloten.
JP2008009007A (ja) * 2006-06-28 2008-01-17 Shikoku Res Inst Inc 顔面装着型画像視認装置
CN103261944A (zh) * 2010-12-28 2013-08-21 洛克希德马丁公司 采用一个或多个反射光表面的头戴式显示装置
GB2591568A (en) * 2019-12-06 2021-08-04 Bae Systems Plc Binocular optical display system
GB2591568B (en) * 2019-12-06 2022-05-11 Bae Systems Plc Binocular optical display system
US12487456B2 (en) 2019-12-06 2025-12-02 Bae Systems Plc Binocular optical display system

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