Diffractive optical elements as combiners

Patent

Diffractive optical elements as combiners

- 07 Jun 1995

51

TL;DR: In this article, a combiner for combining light traveling on two optical paths to permit coincident viewing of the light includes a light-transmissive substrate having first and second surfaces, the first surface having a first diffractive structure that is a computer-generated hologram formed thereon configured to correct aberrations in light travelling on the first optical path which may be incident on the second surface and a partially reflective coating on the 1D structure.

Abstract: A combiner for combining light traveling on two optical paths to permit coincident viewing of the light includes a light-transmissive substrate having first and second surfaces, the first surface having a first diffractive structure that is a computer-generated hologram formed thereon configured to correct aberrations in light travelling on the first optical path which may be incident on the first surface and a partially reflective coating on the first diffractive structure, the partially reflective coating being reflective in a narrow bandwidth only, the first diffractive structure and the partially reflective coating configured to provide corrected reflection to light travelling on the first optical path, the second surface having a second diffractive structure that is a computer-generated hologram formed thereon as a conjugate of the first diffractive structure, so that light travelling on a second optical path which may be incident on the second surface passes through the second and first diffractive structures with substantially no net affect, whereby a viewer may look at the first surface and see the corrected reflection of the light travelling on the first optical path combined with the substantially unaffected light travelling on the second optical path.

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Citations

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References

Patent

High-efficiency, multilevel, diffractive optical elements

Gary J. Swanson, +1 more

- 21 Sep 1987

TL;DR: In this article, a photoresist layer on an optical element substrate is exposed through the first mask and then etched, and the process is repeated for the second and subsequent masks to create a multistep configuration.

...read moreread less

392

Patent

Heads-up display combiner utilizing a cholesteric liquid crystal element

Arthur Louis Berman

- 27 Oct 1988

TL;DR: In this article, a heads-up display (HUD) system employs a cholesteric liquid crystal combiner, an image source, and collimating optics to combine a generated image with an image in an observer's field of view.

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96

Patent

Helmet mounted display system

Joseph LaRussa

- 30 Jul 1991

TL;DR: In this article, a holographic display system with a composite spherical lens and an efficient optical coupling of the display information and the pupil allows the weight of the helmet with the display system to be kept to a minimum.

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63

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Dispersion-compensated windshield hologram virtual image display

Smith Ronald T

- 28 Jun 1990

TL;DR: In this paper, a virtual image display including an image hologram, a dispersion compensating hologram (13A), and an illumination source (11) was used for playback illumination.

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Holographic display element

Ishikawa Tomohisa, +2 more

- 26 Apr 1991

TL;DR: In this paper, a reflection hologram having different diffraction characteristics is superposed on the first hologram on the outer side in order that diffraction of visible light into the aforementioned range of angles may become inconspicuous.

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