Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1991-09-30

1993-10-26

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359690, 359708, 359713, G02B 1514, G02B 1318

Patent

active

052571351

ABSTRACT:
A compact zoom lens system comprises from the object side: a first lens component of a positive refractive power; a second lens component of a negative refractive power with a variable air space between the first and second lens components; and a third lens component of a positive refractive power with a variable air space between the second and third lens components. A plurality of aspherical surfaces are employed for the realization of a compact and low-cost zoom lens system. Furthermore, a focusing operation is carried out by both of the first and second lens components or third lens component.

REFERENCES:
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patent: 4653874 (1987-03-01), Takahashi et al.
patent: 4666257 (1987-05-01), Tanaka et al.
patent: 4721371 (1988-01-01), Imai
patent: 4810071 (1989-03-01), Tsuchida et al.
patent: 4871239 (1989-10-01), Masumoto et al.
patent: 4925280 (1990-05-01), Hashimoto

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