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US 5,289,298 AGranted
Multiplex grating holographic floodlit center high mounted stoplight
AssigneeHughes Aircraft Company
InventorRonald T. Smith
Life of this patent
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Abstract
A hologram structure for use in a holographic center high mounted stoplight system for a vehicle. The hologram structure includes a hologram layer having a plurality of single grating holograms formed in therein, each single grating hologram configured to diffract light at a respective predetermined angle.
Claims8
A holographic center high mounted stoplight system for a vehicle having a rear window, comprising
- a hologram layer having a plurality of single grating holograms formed therein, each single grating hologram configured to diffract light at a respective predetermined angle;
- a playback source that provides playback illumination having angular spread such that each single grating hologram diffracts light over a solid angular region;
- a plurality of primary hologram blocks each including a plurality of single grating holograms arranged in an identical 2-dimensional array and diffracting light into respective solid angular regions within a central solid angular region, wherein the number of single grating holograms in each primary block is selected such that light diffracted by each primary hologram block is visible at all angular positions within the central angular range;
- a plurality of first secondary hologram blocks each including a plurality of single grating holograms arranged in a 1 dimensional array and diffracting light into respective solid angular regions within a first peripheral angular region that is adjacent said central solid angular region, wherein the number of single grating holograms in each first secondary hologram block is selected such that light diffracted by each first secondary hologram block is visible at all angular positions within the first peripheral angular region;
- and
- a plurality of second secondary hologram blocks each including a plurality of single grating holograms arranged in a 1 dimensional array and diffracting light into respective solid angular regions within a second peripheral angular region which is adjacent said predetermined central solid angular region opposite said first peripheral angular region and a mirror image of said first peripheral angular region, wherein the number of single grating holograms in each second secondary hologram block is selected such that light diffracted by each second secondary hologram block is visible at all angular positions within the second peripheral angular region.
3 more elements
A process for constructing a hologram for use in a holographic center high mounted stoplight system that includes a playback source having a predetermined angular spread, comprising the steps of:
- organizing a layer of holographic recording material into primary hologram blocks, first secondary hologram blocks, and second secondary hologram blocks;
- recording in each of the primary hologram blocks a plurality of single grating holograms configured to diffract light into respective solid angular regions within a central solid angular region, wherein such diffraction into an angular solid region is the result of the angular spread of the playback source, and wherein the number of single grating holograms in each primary block is selected pursuant to the angular spread of the playback source such that light diffracted by each primary block is visible at all angular positions within the central solid angular region;
- recording in each of the first secondary hologram blocks a plurality of single grating holograms configured to diffract light into respective solid angular regions within a first peripheral angular region that is adjacent the central solid angular region, wherein such diffraction into an angular solid region is the result of the angular spread of the playback source, and wherein the number of single grating holograms in each first secondary block is selected pursuant to the angular spread of the playback source such that light diffracted by each first secondary block is visible at all angular positions within the first peripheral angular region;
- and
- recording in each of the second secondary hologram blocks a plurality of single grating holograms configured to diffract light into respective solid angular regions with a second peripheral angular region which is adjacent the central solid angular region opposite the first peripheral angular region and a mirror image of the first peripheral angular region, wherein such diffraction into an angular solid region is the result of the angular spread of the playback source, and wherein the number of single grating holograms in each first secondary block is selected pursuant to the angular spread of the playback source such that light diffracted by each second secondary block is visible at all angular positions within the second peripheral angular region.
2 more elements
Dependencies are inferred from the claim text.