Zoom lens system

Details Zoom lens system Zoom lens system

1986-06-06

1989-08-29

Arnold, Bruce Y.

350427, G02B 1500

Patent

active

048611476

ABSTRACT:
In a focusing method for the rear focus type of zoom lens where the range in which the focusing lens should be present for focusing to different object distances varies with zooming, the focusing lens is prevented from moving to the outside of the aforesaid range as zooming is performed. For this purpose, either the range of movement of the focusing lens is limited by a zooming lens arranged in front or in rear of the focusing lens, or the focusing lens is allowed to stand still regardless of zooming when focusing is effected on an object at a shortest distance.

REFERENCES:
patent: 3773402 (1973-11-01), Gala et al.
patent: 3992084 (1976-11-01), Nakamura
patent: 3997245 (1976-12-01), Uesugi
patent: 4161756 (1979-07-01), Thomas
patent: 4281907 (1981-08-01), Kamata
patent: 4421389 (1983-12-01), Muryoi
patent: 4432615 (1984-02-01), Ikemori
patent: 4492437 (1985-01-01), Masumoto et al.

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