Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-04-28
1998-04-28
Metjahic, Safet
Photography
Having variable focal length of camera objective
Having focus operation
396534, G03B 1700, G03B 1104
Patent
active
057458030
ABSTRACT:
A pair of overlapping semi-cylindrical hood members are driven within a zoom lens barrel to slide in the direction of the optical axis, forming a substantially cylindrical lens hood, according to a zooming position of the zoom lens in a telephoto range, and to swing away from one another, forming a flared lens hood, according to a zooming position of the zoom lens in a wide angle range. The hood members are first slid to a maximum extension amount before swinging out in the case of a zooming position in the wide angle range. A detection switch detects when the hood members have been extended to the maximum extension amount. A control device detects the condition of the detection switch and the zooming position of the zoom lens, and controls the position and opening amount of the lens hood accordingly.
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Basic Photography, Langford, Michael J., Focal Press, p. 144, 1986.
Asahi Kogaku Kogyo Kabushiki Kaisha
Mahoney Christopher E.
Metjahic Safet
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