Holographic indicator for determining vehicle perimeter

• US 4,737,001 A
• Filed: 01/06/1987
• Issued: 04/12/1988
• Est. Priority Date: 01/06/1987
• Status: Expired due to Term

• Current Assignee: Delphi Technologies, Inc. (BorgWarner Incorporated)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Moss, Gaylord E.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Lerner, Martin
• Application Number:
  US07/000,794
• Time in Patent Office: 462 Days
• Field of Search: 350/3.6-3.69, 350/3.75, 350/3.76, 350/174, 350/631, 350/632, 340/103, 340/104, 340/97, 340/99
• US Class Current: 359/34
• CPC Class Codes: B60Q 1/484 for showing outline of vehicle
• CPC Class Codes: G02B 2027/0107 with optical power
• CPC Class Codes: G02B 2027/0109 comprising details concerning the making of holograms
• CPC Class Codes: G02B 2027/0145 creating an intermediate image
• CPC Class Codes: G02B 27/0103 comprising holographic elements
• CPC Class Codes: G03H 1/0408 Total internal reflection [TIR] holograms, e.g. edge lit or substrate mode holograms
• CPC Class Codes: G03H 1/22 Processes or apparatus for obtaining an optical image from holograms G03H1/26 - G03H1/34 take precedence
• CPC Class Codes: G03H 2001/0428 Image holography, i.e. an image of the object or holobject is recorded G03H1/0406 takes precedence; holographic microscope G03H2001/005
• CPC Class Codes: G03H 2001/2284 Superimposing the holobject with other visual information

Abstract

A holographic indicator for determining a vehicle perimeter location is provided. A substantially transparent hologram member can be fixed to either the windshield or the rear window and contains a holographic image of indicia representing a virtual image of an indicator that will correspond spatially to a perimeter location of a vehicle body when appropriately illuminated. A light source can be selectively illuminated by the driver to realize the virtual image of the indicator to assist him in close manuevering, such as parking.

Claims

1. Apparatus for the selective simulation of an apparent edge of a vehicle body having a windshield and a rear window comprising:

a substantially transparent hologram member capable of being fixed to one of the windshield and the rear window, the hologram member containing a holographic image of indicia representing a virtual image of an indicator that would correspond spatially to a perimeter location of the vehicle body when appropriately illuminated; and

means for illuminating the holographic image to realize the virtual image at a predetermined time under control of an operator.

2. The invention of claim 1 wherein the hologram member includes a substantially transparent substrate, a film layer of a holographic material developed to retain a holographic image and a protective layer positioned across the holographic material.

3. The invention of claim 2 further including a second film layer of a holographic material developed to retain a holographic image of a reflective surface to provide a barrier to protect the indicator image whereby stray light is prevented from activating a realization of the image.

4. The invention of claim 1 wherein the means for illuminating includes a source of light that projects light at a predetermined angle and at a predetermined bandwidth to impact and realize the image within the angle of view of the driver.

5. The invention of claim 1 wherein the means for illuminating is connected to an edge of the hologram member.

6. The invention of claim 5 wherein the means for illuminating includes a fiber optic link connected to one edge of the hologram member and a light source.

7. The invention of claim 6 wherein the holographic image has a limited field angle of view whereby only the driver can normally view the image.

8. An improved pane of glass for installation in a vehicle body having a sloping vehicle body perimeter that cannot be observed from the driver'"'"'s position, comprising:

a transparent substrate of glass;

a substantially transparent hologram member fixed to the substrate of glass at a position corresponding to a line of sight of a driver looking to the corner perimeter of the vehicle body, the hologram member containing a holographic image of a virtual image of an indicator that would spatially correspond to a perimeter location of the vehicle body when appropriately illuminated and would appear to the driver as being positioned at the perimeter corner location of the vehicle; and

means for illuminating the holographic image to realize the virtual image at the option of the driver.

9. The invention of claim 8 wherein the hologram member includes a substantially transparent substrate, a film layer of a holographic material developed to retain a holographic image and a protective layer positioned across the holographic material.

10. The invention of claim 9 wherein the means for illuminating includes a fiber optic coupler for connection to the edge of the hologram member.

11. The invention of claim 9 wherein the means for illuminating includes a source of light that projects light at a predetermined angle and at a predetermined bandwidth to impact and realize the image within the angle of view of the driver.

12. The invention of claim 11 further including a second film layer of a holographic material developed to retain a holographic image of a reflective surface to protect the indicator image whereby stray light is prevented from activating a realization of the image.

13. Apparatus for the selective simulation of an indicator of an apparent perimeter edge of a vehicle body having a windshield and a rear window comprising:

a plurality of substantially transparent hologram members capable of being fixed to the windshield and the rear window, each of the hologram members contains a holographic image of indicia representing a virtual image of an indicator that would correspond spatially to a perimeter location of the vehicle body when appropriately illuminated, each hologram member includes a substantially transparent substrate, a film layer of a holographic material developed to retain a first holographic image of a reflective type to reflect stray light, a second a holographic image of the indicia representative of the perimeter location and a protective layer positioned across the holographic material; and

means for illuminating the holographic image to realize the virtual image at a predetermined time under control of an operator.

14. The invention of claim 13 wherein the means for illuminating includes a source of light that projects light at a predetermined angle and at a predetermined bandwidth to impact and realize the image within the angle of view of the driver.

15. The invention of claim 13 wherein the means for illuminating includes a source of light to reconstitute a reference light beam extending through a length of each hologram and introduced adjacent an edge of each hologram.

16. Apparatus for the selective simulation of an indicator of an apparent peripheral edge of a vehicle body, whose real edge is obstructed from the view of an operator, comprising:

means for generating a virtual image of an indicator that would correspond spatially to a perimeter location of the vehicle body; and

control means for realizing the virtual image, when desired by the operator of the vehicle, within his normal field of view.

17. The invention of claim 16 wherein the means for generating includes a hologram member having a substantially transparent substrate, a film layer of a holographic material developed to retain a holographic image and a protective layer positioned across the holographic material.

18. The invention of claim 17 wherein the control means includes means for illuminating a source of light that projects light at a predetermined angle and at a predetermined bandwidth to impact and realize the image within the angle of view of the driver.

19. The invention of claim 18 wherein the source of light is coupled to the hologram member along one edge of the hologram member.