Rear-focus zoom lens device and video camera

Details Rear-focus zoom lens device and video camera Rear-focus zoom lens device and video camera

2005-06-28

2005-06-28

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S696000, C359S698000, C359S702000, C396S085000, C396S079000

Reexamination Certificate

active

06912096

ABSTRACT:
A rear-focus zoom lens device includes a wide-angle direction rotation restricting unit and a telephoto direction rotation restricting unit for separately restricting rotations of a zoom ring in a wide-angle direction and a telephoto direction and for separately canceling the restricting operations at any rotational positions of the zoom ring in the wide-angle direction and the telephoto direction, respectively, when rotating the zoom ring in the wide-angle direction and the telephoto direction, respectively.

REFERENCES:
patent: 4255020 (1981-03-01), Yukio
patent: 4739359 (1988-04-01), Fukahori et al.
patent: 4764784 (1988-08-01), Torikoshi et al.
patent: 5016993 (1991-05-01), Akitake
patent: 5699199 (1997-12-01), Cho et al.
patent: 5712734 (1998-01-01), Kanno
patent: 5982566 (1999-11-01), Nishimura et al.

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