Optical: systems and elements – Lens – With variable magnification
Patent
1998-10-14
2000-08-01
Epps, Georgia
Optical: systems and elements
Lens
With variable magnification
359696, 396 80, 396 87, G02B 1514
Patent
active
060975482
ABSTRACT:
A detecting mechanism for detecting a position of a zoom lens used in a camera, in which the same signal is output at each of a plurality of locations through which the lens passes, and in which it is possible to execute a resetting operation of the lens with a lesser mechanical load being exerted upon the lens at both ends of a region within which the lens is driven to move. The mechanism includes a position detection switch that outputs signals of "ON" and "OFF" alternately along a direction in which the lens is driven to move. The switch outputs the signal of "ON" when the lens is on one end of the region, and outputs the signal of "OFF" when the lens is on the other end thereof. When the switch is "ON" at time of the resetting operation, the lens is driven towards the other end thereof, and when the switch is "OFF" at time thereof, the lens is driven towards the one end. This mechanism prevents the lens from striking or hitting on each end of the region.
REFERENCES:
patent: 5144491 (1992-09-01), Ushiro et al.
patent: 5223873 (1993-06-01), Tsuboi
patent: 5655159 (1997-08-01), Nakayama et al.
patent: 5897227 (1999-04-01), Haraguchi et al.
Funahashi Akira
Ikeda Takahiro
Nakajima Hidekazu
Epps Georgia
Minolta Co. , Ltd.
Thompson Tim
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