Compact zoom lens system with a high zoom ratio

Details Compact zoom lens system with a high zoom ratio Compact zoom lens system with a high zoom ratio

1989-03-30

1991-01-08

Sugarman, Scott J.

350432, G02B 1514, G02B 1318

Patent

active

049830279

ABSTRACT:
A compact zoom lens system with a high zoom ratio is provided which comprises from the object side to the image side, a first lens unit of a positive refractive power, a second lens unit of a positive refractive power with a first variable air space formed between the first and second lens units, and a third lens unit of a negative refractive power, wherein the first lens unit and the third lens units are shiftable from the image side to the object side and the second lens unit is shiftable so that the first variable air space increases and the second variable air space decreses in the zooming operation from the shortest focal length to the longest focal length, wherein the second or third lens units includes at least an aspherical surface, and wherein the second or third lens units are shiftable in the focusing operation. Further, a diaphragm is located at the image side or the object side of the second lens element.

REFERENCES:
patent: 4773744 (1988-09-01), Yamanashi
patent: 4822152 (1989-04-01), Yamanashi
patent: 4854682 (1989-08-01), Yamanashi

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