Projection lens and method of using same

Details Projection lens and method of using same Projection lens and method of using same

1993-09-17

1996-01-09

Sugarman, Scott J.

Optical: systems and elements

Lens

Multiple component lenses

359716, G02B 920, G02B 1318

Patent

active

054833825

ABSTRACT:
A new and improved projector lens arrangement which can automatically adjusted for focusing purposes in an easily and convenient manner according to a novel focusing method of the present invention. The projection lens arrangement generally includes three groups of optical elements aligned along a common optical axis with a variable vertex length and wide field coverage angle. One element group near the object is a doublet having a negative element with a concave surface and a positive element being bi-convex having one surface near the image complementarily shaped to the concave surface of the negative element.

REFERENCES:
patent: 3905686 (1975-09-01), Ruben
patent: 3944337 (1976-03-01), Ruben
patent: 4487484 (1984-12-01), Mihara
patent: 4830474 (1989-05-01), Nakayama et al.
Smith, W. J.; Modern Lens Design; McGraw-Hill; Figs 12.3 and 12.4.

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