Zoom lens having built-in diaphragm

Details Zoom lens having built-in diaphragm Zoom lens having built-in diaphragm

1987-05-01

1990-10-16

Sugarman, Scott J.

350450, G02B 15177

Patent

active

049630059

ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of negative power and a second lens unit of positive power, both lens being axially moved to effect zooming, in which a diaphragm is arranged between the first and second lens units to remain stationary during zooming.

REFERENCES:
patent: 3918797 (1975-11-01), Takano
patent: 4315669 (1982-02-01), Fujii
patent: 4591235 (1986-05-01), Tokumaru et al.
patent: 4763998 (1988-08-01), Tsuji et al.

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