High-speed zoom lens

Details High-speed zoom lens High-speed zoom lens

Filed on

1982-09-16

Date issued

1984-12-25

Examiner

Corbin, John K.

Other Related Categories

G02B 964, G02B 1518

Type

Patent

Status

active

Patent number

044900171

Description

ABSTRACT:
A zoom lens comprising a first lens component having a positive refractive power, a second lens component having a negative refractive power, a third lens component having a negative refractive power, and a fourth lens component having a positive refractive power, the first through fourth lens components being arranged in order from an object. The first lens component comprises a focusing lens component composed of a composite lens having a first negative lens and a second positive lens, and a third positive-meniscus lens, the second lens component comprises a variator lens composed of fourth and fifth negative lenses and a sixth positive lens mainly for varying magnification, the third lens component comprises a compensator lens component composed of a seventh negative lens mainly for compensating for a variation of a focal point due to varied magnification, and the fourth lens component comprises a fixed master lens component composed of four or more positive lenses and two negative lenses with positive lenses disposed most closely to the object and an image, respectively.

REFERENCES:
patent: 3885862 (1975-05-01), Fujioka et al.

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