Zoom finder

Details Zoom finder Zoom finder

1996-09-23

1998-07-07

Metjahic, Safet

Photography

Having variable focal length of camera objective

Having direct viewfinder

396379, G03B 1310, G03B 1702

Patent

active

057782628

ABSTRACT:
In a zoom finder incorporated into a camera with a zooming function, the power of a motor, which also serves as a motor for driving a lens barrel of a taking lens, is transmitted to a lens barrel driving gear, and it is transmitted via a gear train to a cam shaft, where a cam face for regulating positions of movable lenses in a finder variable magnification optical system is formed. The gear train is held by a gear holding plate, and is directly attached to the bottom of an AF/finder body frame, in which the cam shaft is mounted, with the gear holding plate. As a result, the backlash of the gear train can be small, and a hysteresis of a magnification and a visual field rate, hysteresis which is caused by the back and forth movement of the movable lenses, can be prevented.

REFERENCES:
patent: 5036346 (1991-07-01), Hatamori et al.
patent: 5068678 (1991-11-01), Mogamiya et al.
patent: 5325140 (1994-06-01), Torikoshi et al.
patent: 5335030 (1994-08-01), Suzuka

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