Camera with changeable focal length

Details Camera with changeable focal length Camera with changeable focal length

1988-05-31

1989-05-16

Adams, Russell E.

35419512, G03B 300

Patent

active

048314021

ABSTRACT:
A camera includes a taking lens system changeable in focal length between at least a short focal length suitable for wide-angle photography and a long focal length suitable for telephotography. The lens system is held in a lens barrel which is axially displaced by means of a motor to change the lens system between at least the two different focal lengths. The camera is provided with a controller for sequentially controlling the motor to move the lens barrel in one axial direction so as to change the lens system to have one of the different focal lengths selected by a focal length selecting switch, to move the lens barrel in the opposite axial direction when the lens barrel does not reach a position wherein the taking lens system has the selected focal length in a predetermined time period, and to stop when the lens barrel reaches the position wherein the taking lens system has another one of the different focal lengths. For detecting the lens barrel at the axial position where the taking lens system has the different focal lengths, the camera is provided with a detector for detecting an unusual motion of the lens barrel in cooperation with the controller.

REFERENCES:
patent: 4708454 (1987-11-01), Kodaira et al.
patent: 4717932 (1988-01-01), Hoshino et al.
patent: 4728980 (1988-03-01), Nakamora et al.
patent: 4757372 (1988-07-01), Beutensky et al.
patent: 4764784 (1988-08-01), Torikoshi et al.

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