Projection device for photogrammetrical purposes

Details Projection device for photogrammetrical purposes Projection device for photogrammetrical purposes

1975-02-05

1977-03-15

Haroian, Harry N.

Optics: image projectors

Particular condenser

353 38, G03B 2120, G03B 2114

Patent

active

040121364

ABSTRACT:
A projecting device, particularly for use in photogrammetry, employs a Fresnel condensor for illuminating a picture carrier which is imaged through an objective, including a diaphragm, onto a projection table. At least half of the illumination rays entering said objective, is suppressed by said diaphragm. The Fresnel condensor and the severe stopping-down of the objective produce interfering chromatical effects on the projection table. Said chromatical effects are eliminated either by means of a bi- or multifocal embodiment of the Fresnel lens or by insertion of optical means which extend the optical illumination path or by a respective embodiment of the light source.

REFERENCES:
patent: 2804802 (1957-09-01), Loeck
patent: 3334958 (1967-08-01), Appeldorn
patent: 3340765 (1967-09-01), Herriott
patent: 3366006 (1968-01-01), Saila
patent: 3511563 (1970-05-01), Erwin
IBM Technical Disclosure Bulletin, vol. 3, No. 1, June, 1960, p. 1, "Display Equipment Lighting" by J. V. Collins.

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