Focusing lens drive method

Details Focusing lens drive method Focusing lens drive method

1988-03-28

1990-01-30

Perkey, W. B.

G03B 310

Patent

active

048976830

ABSTRACT:
A method for use in an automatic focusing camera for driving a focusing lens to a focused position in which the speed is changed in decreasing incremental steps as the lens approaches the focused position and the speed is made independent of changes in ambient temperature or the orientation of the camera relative to the direction of gravitational force. The speed of the lens is controlled in accordance with duty ratio data prestored in a memory and which is applied to control the duty ratio of a drive signal to a motor employed to position the focusing lens. A correction value for correcting for the effects of changes in ambient temperature is obtained prior to the start of the focusing operation and applied to correct the duty ratio of the drive signal during the actual focusing operation.

REFERENCES:
patent: 4303321 (1981-12-01), Enomoto et al.
patent: 4613224 (1986-09-01), Ogasawara
patent: 4745425 (1988-05-01), Kusaka
patent: 4772909 (1988-09-01), Ogasawara

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