Projection pointer

Optics: image projectors – Pointer

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G03B 2100

Patent

active

059383089

ABSTRACT:
An improved optical system is disclosed for projecting light in the form of an image to a remote target. The laser light source and a holographic optical element are mounted together in optical alignment. The optical element is created using iterative discrete computer encoding for optimum efficiency. In alternate embodiments, the diffractive optical element has a collimating lens encoded into the grating levels and it also performs soft aperture circularizing using either amplitude or phase control over the coherent light. An embossed diffractive optical element laminated to an injection-molded refractive element is also disclosed.

REFERENCES:
patent: 3656845 (1972-04-01), Koch-Boss
patent: 5024494 (1991-06-01), Williams et al.
patent: 5161059 (1992-11-01), Swanson et al.
patent: 5202775 (1993-04-01), Feldman et al.
patent: 5450148 (1995-09-01), Shu et al.
patent: 5477283 (1995-12-01), Casey
patent: 5694230 (1997-12-01), Welch
patent: 5718496 (1998-02-01), Feldman et al.
Diffractive Optics Gives Laser Pointers a New Twist by Diane H. Hochmuth and Patrick J. Readron in Photonics Spectra, Aug. 1995, p. 95.
Iterative Encoding of High-efficiency Holograms for Generation of Spot Arrays by Feldman and Guest, in Optics Letters, vol. 14, No. 10, pp. 479-481, May 15, 1989.

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