Superimposed tell-tales

Patent 5214425 Issued on May 25, 1993. Estimated Expiration Date:

May 30, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Wreede, John E.

Application

No. 708403 filed on 05/30/1991

US Classes:

340/980, Indicator visible in pilot's line of sight through windscreen340/461, With particular display means345/7, IMAGE SUPERPOSITION BY OPTICAL MEANS (E.G., HEADS-UP DISPLAY)359/24, Superimposed holograms only359/630Superimposing visual information on observer`s field of view (e.g., head-up arrangement, etc.)

Examiners

Primary: Ng, Jin F.
Assistant: Swarthout, Brent A.

Attorney, Agent or Firm

Alkov; L. A., Denson-Low; W. K.

International Class

G01C 021/00

Abstract

A holographic head-up display having first and second superimposed reflection holograms supported by a vehicle windshield, and first and second playback sources respectively associated with the first and second reflection holograms and positioned such that reflection by the windshield of playback illumination from one playback source is toward the other playback source. In particular, the first and second playback sources are configured such that the centerlines of the playback beams provided by the first and second playback sources are coplanar in a common plane that is substantially normal to the holograms, with the centerlines intersecting generally in the hologram layers and having substantially the same angle of incidence on the hologram layers as measured relative to normal in the common plane.