Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse motor controls
Patent
1995-11-03
1998-06-30
Sircus, Brian
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural, diverse motor controls
318 60, 318625, 318597, 318599, 396396, 396406, 396410, G03B 100, H02P 154, G05B 1132
Patent
active
057739404
ABSTRACT:
A power drive device is disclosed that includes a motor, a control device coupled to the motor, and a rotatable reference axle member rotatably interlocked with the rotation of the motor. A first detection member detects a first phase and a third phase of rotation of the reference axle member wherein the first phase corresponds to a rotation starting position of the reference axle member and the third phase corresponds to a near completion position of the reference axle member. The device also includes a second detection member that detects a second phase and a fourth phase of rotation of the reference axle member, wherein the fourth phase of rotation corresponds to a rotation completion position of the reference axle member. The control device drives the motor in accordance with the detected phases of the first and second detection members, and in particular, can control the velocity of the motor and the timing of the operation of the motor in relation to a second motor. The power drive device may be used in a camera to wind film and charge various mechanisms of the camera, such as a shutter.
REFERENCES:
patent: 4371244 (1983-02-01), Daitoku et al.
patent: 4579435 (1986-04-01), Haraguchi
patent: 4958175 (1990-09-01), Asakura et al.
patent: 5094116 (1992-03-01), Shintani
patent: 5543878 (1996-08-01), Murakami
Nikon Corporation
Sircus Brian
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