Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1993-09-13

1996-03-12

Ip, Paul

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318375, 354400, 354430, G03B 310, H02P 312

Patent

active

054989442

ABSTRACT:
An automatic focusing apparatus having an object distance data detecting mechanism having an optical system which includes a focusing lens assembly which can be driven by a motor, and a mechanism for detecting an angular velocity of the motor. The optical system further includes a motor driving mechanism for driving the motor in a direction and at an angular velocity based on object distance data obtained by the object distance data detecting mechanism to move the focusing lens assembly, and a mechanism for controlling the motor. When the motor is instructed to be stopped, the angular velocity is reduced to a predetermined value. The controlling mechanism is effected in accordance with the angular velocity detected by the velocity detecting means.

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