Modular helmet-mounted display

• US 5,677,795 A
• Filed: 01/10/1995
• Issued: 10/14/1997
• Est. Priority Date: 01/10/1995
• Status: Expired due to Term

• Current Assignee: L-3 Communications Corporation (L3Harris Technologies, Inc.)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Hegg, Ronald G.
• Primary Examiner(s): Epps, Georgia Y.
• Assistant Examiner(s): Robbins, Thomas
• Application Number:
  US08/370,718
• Time in Patent Office: 1,008 Days
• Field of Search: 359/629, 359/630, 359/631, 359/633
• US Class Current: 359/630
• CPC Class Codes: G02B 2027/0132 comprising binocular systems
• CPC Class Codes: G02B 2027/0156 with optionally usable elements
• CPC Class Codes: G02B 27/0172 characterised by optical features

Abstract

An aviator'"'"'s helmet-mounted display includes a visor/combiner module (14) which is configured for use with an essentially standard aviator'"'"'s flight helmet (12). The helmet-mounted display also includes a conformal image source and relay optics (ISRO) module (30) which is removably attachable to the aviator'"'"'s helmet. This ISRO module (30) projects an image inwardly from outside the visor/combiner module through a transparent window portion (44) thereof and out and inner surface (48) of an angulated transparent viewing portion (18,20) of the visor/combiner module (14). The image is focused at infinity and is partially reflected from the inner surface (48) to an eye (50) of the aviator so that the image is superimposed on the aviator'"'"'s view of an outside scene viewed through the viewing portion (18,20).

Claims

1. A helmet-mounted modular display for use with a protective helmet, said modular display comprising:

a visor/combiner module configured for attachment to the helmet to protect at least the eyes of a user who is wearing the helmet, said visor/combiner module having a transparent window portion at one side thereof peripherally adjacent to one eye of the user, and a transparent viewing portion at the opposite side thereof disposed in front of the other eye of the user to allow viewing of a scene therethrough, said viewing portion having an inner surface which is angulated toward said window portion;

an image source and relay optics (ISRO) module configured for removable attachment to an exterior surface of the helmet adjacent to said window portion, said ISRO module including a light-emitting image source providing an image, and relay optics projecting said image from said ISRO module inwardly of said visor/combiner module through said window portion thereof and onto said inner surface focused at infinity for partial reflection to the other eye of the user;

whereby said user sees said image superimposed upon said scene, said ISRO module is separable from said helmet, and said visor/combiner module is usable as a protective visor without use of said ISRO module.

2. The helmet-mounted modular display of claim 1 wherein said visor/combiner module includes a pair of transparent window portions arranged one at each side thereof, and a pair of transparent viewing portions disposed in front of respective eyes of a wearer of the helmet.

3. The helmet-mounted modular display of claim 2 wherein said pair of transparent viewing portions are each angulated toward the respective opposite ones of said pair of window portions, said pair of viewing portions cooperatively defining a vertically-extending cusp therebetween.

4. The helmet-mounted modular display of claim 2 wherein said visor/combiner module also includes an upper portion and respective right-side and left-side portions configured to interface with the helmet to substantially provide wind-blast protection to the wearer of the helmet.

5. The helmet-mounted modular display of claim 4 wherein said right-side and left-side portions of said visor/combiner module each define a respective one of said pair of transparent window portions.

6. The helmet-mounted modular display of claim 1 wherein said ISRO module includes a conformal housing carrying said image source and said relay optics and being adapted for removable attachment to an exterior surface of said helmet.

7. The helmet-mounted modular display of claim 6 wherein said ISRO module further includes a cable extending therefrom, which cable upon the application of a tension force thereto is effective to pull said housing out of attachment with said helmet.

8. The helmet-mounted modular display of claim 6 wherein said display includes a pair of said ISRO modules which are respectively configured for right-side and left-side attachment with said helmet.

9. A method of providing a display to the wearer of a helmet having a visor in front of the wearer'"'"'s eyes for wind-blast protection, said method including the steps of:

providing said visor with a transparent viewing portion disposed in front of one eye of the wearer of the helmet for providing a view of a scene therethrough, and providing said viewing portion with an at least partially reflective inner surface angulated toward an opposite side of the helmet, providing said visor at said opposite side of the helmet with a side portion configured to interface with the helmet to substantially provide wind-blast protection to the wearer of the helmet, and providing said side portion with a transparent window portion;

externally attaching an image source and relay optics (ISRO) module to an exterior surface of the helmet at the opposite side thereof;

projecting an image from the ISRO module through said transparent window portion across the wearer'"'"'s face and onto said inner surface of the viewing portion;

at least partially reflecting the projected image from the inner surface to the wearer'"'"'s one eye focused at infinity;

superimposing said image on the scene viewed by said one eye through said viewing portion.

10. The method of claim 9 further including the step of providing said visor with a pair of said transparent viewing portions each disposed in front of a respective eye of the wearer of the helmet for providing a view of the scene therethrough.

11. The method of claim 10 further including the steps of attaching a pair of said ISRO modules to the helmet, which modules are configured for left-side and right-side attachment to the helmet;

and using said pair of ISRO modules to project respective images in opposite directions across the face of the wearer onto the inner surfaces of the opposite viewing portions of said visor.

12. The method of claim 9 further including the step of providing for said ISRO module to be removable from the helmet.

13. The method of claim 12 additionally including the steps of extending a cable from said ISRO module, and releasing the attachment of the ISRO Module to the helmet in response to application of certain tension forces to said cable.

14. A helmet-mounted modular display for use with a protective helmet, said modular display comprising:

a visor/combiner module configured for attachment to the helmet to protect the eyes of a person wearing the helmet, said visor/combiner module having a pair of relatively-angulated transparent viewing portions each disposed in front of a respective eye of the wearer of the helmet to allow viewing of a scene therethrough, said pair of relatively angulated viewing portions defining a forwardly-extending and vertically-extending cusp therebetween, and a continuous upper portion and respective continuous right-side and left-side portions of said visor/combiner module each extending rearwardly from said pair of viewing portions toward the helmet and being configured to interface with the helmet to substantially provide wind-blast protection to the wearer of the helmet, each one of said side portions defining a respective one of a pair of transparent window portions, said pair of viewing portions each having an inner surface angulated toward the one of said pair of window portions on the opposite side of said visor/combiner module;

a pair of image source and relay optics (ISRO) modules each configured for removable attachment to a respective right-side or left-side exterior surface of the helmet adjacent to a respective one of said pair of window portion, each of said pair of ISRO modules including a respective light-emitting image source providing an image and relay optics projecting said image from said ISRO module inwardly of said visor/combiner module through a respective one of said pair of window portions and onto the opposite one of said pair of viewing portion inner surfaces for partial reflection to the respective eye of the user;

whereby said projected images are focused at infinity, and the user sees these images superimposed upon the scene.