Title:
プログラムシャッタ駆動装置
Document Type and Number:
Japanese Patent JP2529345
Kind Code:
B2
Abstract:
A program shutter drive system has an ultrasonic motor for controlling an opening size of a shutter according to a programmed schedule of operation according to a brightness of a subject to be photographed. The ultrasonic motor drives the shutter to open and close according to a proper exposure determined for a subject based on a brightness of the subject by an exposure determining device. A control signal generator provides a position indicating signal and a speed indicating signal which are determined to perform a programmed schedule of operation of the shutter according to the proper exposure output. A detector is provided to output an actual position signal representing an actual opening of the shutter and an actual speed signal representing an actual speed at which the shutter opens to the actual opening size. The position and speed indicating signals are compared with the actual position and speed signals, respectively, so as to control rotation of the ultrasonic motor.
Inventors:
吉田 豊
那珂 洋二
那珂 洋二
Application Number:
JP8033488A
Publication Date:
August 28, 1996
Filing Date:
April 01, 1988
Export Citation:
Assignee:
富士写真フイルム株式会社
International Classes:
G03B7/087; G03B7/10; G03B9/24; H02N2/00; G03B7/097; (IPC1-7): G03B7/097; G03B9/24; H02N2/00
Domestic Patent References:
| JPS62236368A | ||||
| JPS62178935A |
Attorney, Agent or Firm:
小林 和憲 （外１名）