US5243449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ambient turn-on suppression hologram
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1992-02-13
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Granted: 1993-09-07
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Expires: 2012-02-13
Abstract
Abstract A guard hologram blocks ambient turn-on of an image hologram. In a center high-mounted rearview stoplight assembly, a guard hologram is used to prevent ambient turn-on by the sun and still allow optical transparency of the image hologram. The guard hologram preferred is optically mounted to the lamp side of the image hologram and includes two 0-degree reflection holograms separated by a halfwave film.
Inventors
- 👤 Ronald T. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:35
CPC Classifications
B; B60; B60Q; B60Q1/00; B60Q1/26; B60Q1/44; B60Q1/30; B60Q1/302; G; G02; G02B; G02B27/00; G02B27/28; G02B27/281; G02B5/00; G02B5/32; G03; G03H; G03H1/00; G03H1/02; G03H1/0252; G03H1/0256; G03H1/26; G03H2001/2605; G03H2001/261; G03H2001/2615; G03H2223/00; G03H2223/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A hologram for use with a vehicle with a rear window, comprising: (a) a light source; (b) an image hologram member for forming an image when illuminated by the light source; (c) a separate guard hologram member for blocking ambient turn-on of the image hologram wherein the guard hologram is mounted relative to the image hologram opposite an ambient source exterior to the vehicle and incident on the outside surface of the read window of the vehicle and wherein said image hologram is located between the ambient source and said separate guard hologram; and (d) said guard hologram includes two reflection holograms separated by a halfwave plate.
Claim 2
Dependent Claim
107 words
A hologram for use with a vehicle with a rear window, comprising: (a) a light source; (b) an image hologram member for forming an image when illuminated by the light source; (c) a separate guard hologram member for blocking ambient turn-on of the image hologram wherein the guard hologram is mounted relative to the image hologram opposite an ambient source exterior to the vehicle and incident on the outside surface of the read window of the vehicle and wherein said image hologram is located between the ambient source and said separate guard hologram; and (d) said guard hologram includes two reflection holograms separated by a halfwave plate.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein the guard hologram member is an optically bonded sandwich.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 wherein the image hologram is a centered high-mounted stoplight holographic image.
Claim 5
Dependent Claim
31 words
The apparatus of claim 1 wherein the image hologram is a centered high-mounted stoplight holographic image, and the guard hologram prevents ambient turn-on from interfering with a driver's rear view vision.
Claim 6
Dependent Claim
27 words
The apparatus of claim 4 wherein the guard hologram minimizes the amount of luminous energy of ambient turn-on light which interferes with the driver's rear view vision.
Claim 7
Dependent Claim
17 words
The apparatus of claim 5 wherein the interfering light is spatially truncated by a rear view mirror.
Claim 8
Dependent Claim
28 words
The apparatus of claim 1 wherein the guard hologram member includes at least one diffraction grating having a fringe pattern wherein the fringes are parallel to one another.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-06 | 1997-03-08 | 1997-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-06 | 2001-03-08 | 2001-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-06 | 2005-03-08 | 2005-09-07 | $7700.00 | Window Closed / Lapsed |