Focal length varying device which avoids errors due to mold part

Details Focal length varying device which avoids errors due to mold part Focal length varying device which avoids errors due to mold part

1996-04-02

1997-09-09

Metjahic, Safet

Photography

Having variable focal length of camera objective

Having focus operation

396 85, 396134, 359699, G02B 1514

Patent

active

056665652

ABSTRACT:
A device for varying the focal length of a phototaking optical system comprises a cam member having a cam portion, a guide member having a guide portion, a driven member provided in a part of the phototaking optical system and maintained in contact with the cam portion and the guide portion, and a drive unit for moving the driven member in response to a relative movement of the cam member and the guide member, thereby continuously varying the total length of the phototaking optical system between a telephoto end position and a wide angle end position, wherein the cam member is formed by molding of a resinous material in such a manner that a parting line formed in the cam portion is not contacted by the driven member at the telephoto end position and at the wide angle end position.

REFERENCES:
patent: 4386829 (1983-06-01), Sumi
patent: 5077571 (1991-12-01), Takayama et al.
patent: 5111226 (1992-05-01), Nakamura et al.
patent: 5144493 (1992-09-01), Nomura
patent: 5216549 (1993-06-01), Notagashira et al.

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