Apparatus having a driven member and a drive controller therefor

Details Apparatus having a driven member and a drive controller therefor Apparatus having a driven member and a drive controller therefor

1997-06-10

1998-09-29

Perkey, W. B.

Photography

Camera shake sensing

Having stabilization system

396133, 318466, G03B 500, G03B 1336, G05B 500

Patent

active

058157425

ABSTRACT:
An apparatus has a member to be driven, an actuator for driving the member, a position detector and a controller. The actuator drives the member to move by an amount proportional to a given number of pulses. The position detector detects a position of the member in predetermined detection steps. The controller determines in steps smaller than the predetermined detection steps a target position up to which the member is to be moved. Then, it controls the actuator up to a detection-step position before the target position by closed-loop control in accordance with a detection result from the detector. Further, it controls the actuator from the detection step position to the target position by open-loop control.

REFERENCES:
patent: Re31362 (1983-08-01), Shenk
patent: 4474442 (1984-10-01), Shiozawa et al.
patent: 4517501 (1985-05-01), Takimoto
patent: 4918479 (1990-04-01), Inoue et al.
patent: 5389997 (1995-02-01), Ohishi

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