Projection optical device

Details Projection optical device Projection optical device

1984-12-03

1987-06-02

Haroian, Harry N.

Optics: image projectors

Lens support

Lens position adjustable

353122, G03B 2734

Patent

active

046698426

ABSTRACT:
An optical device projects a pattern of a first object on a second object through an optical system. Changes in the temperature of the optical system or changes in the ambient temperature of the optical system are detected and, on the basis of the detected temperature, any focus deviation or displacement of the optical system due to the temperature change is corrected. The correction of the focus deviation is achieved by controlling the temperature of the optical system or the position of the second object.

REFERENCES:
patent: 4236790 (1980-12-01), Smith
patent: 4420233 (1983-12-01), Nomoto et al.
patent: 4503335 (1985-03-01), Takahashi

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