Lens barrel and camera

Details Lens barrel and camera Lens barrel and camera

2005-02-08

2005-02-08

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S699000, C359S700000, C359S819000, C359S826000

Reexamination Certificate

active

06853499

ABSTRACT:
A cam cylinder is provided with a first group cam and a second group cam, respectively. A first group lens system and a second group lens system are engaged through a first group driving pin and a second group driving pin with the first and second group cams, respectively. The first and second group lens systems are biased by a spring and are placed under a biased force acting in the opposite directions along an optical axis. The first and second group cams have large cam angles in the vicinity of a starting position for collapsing in which a spring force is small, and the cam angles are reduced continuously in response to an increment of the spring force, and the cam angles become minimum in the vicinity of a collapsed position in which the spring force is maximum.

REFERENCES:
patent: 5392100 (1995-02-01), Yoshida
patent: 5969878 (1999-10-01), Koizumi
patent: 6195212 (2001-02-01), Miyamoto
patent: 2002-162552 (2002-06-01), None

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