Photography – Having variable focal length of camera objective – Having focus operation
Patent
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.
Kato Minoru
Wakabayashi Hiroshi
Han J. K.
Metjahic Safet
Nikon Corporation
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