Camera with changeable focal length

Details Camera with changeable focal length Camera with changeable focal length

1988-10-20

1989-09-19

Gellner, Michael L.

3541731, G03B 310

Patent

active

048685909

ABSTRACT:
A photographic camera with changeable focal length has a reversible motor used both to wind and to rewind a film and also to move a taking lens in order to shift it between first and second photographic modes. A lens barrier is caused to open and close by a barrier operating member, for protecting the taking lens, and by a motor control circuit. The circuit includes two changeover switches one of which is connected to one of two motor terminals, an encoder connected to the other motor terminal for shifting the circuit between a film drive mode selected when the taking lens is in either one of the two modes and a taking lens drive mode upon changing the taking lens between the first and second modes. The encoder has first and second mode selecting contacts at which the encoder stops the motor to select the first and second modes, respectively. A photographic mode selecting switch is connected between the first mode selecting contact and the other of the changeover switches for actuating the motor to rotate regardless of the selected mode of the circuit. A first power switch is provided, for disconnecting the motor from a power source when the lens barrier is fully closed; and a second power swwitch is provided, connected between the second mode selecting contact and the mode selecting switch for disconnecting the motor from the power source when the barrier operating member opens the lens barrier.

REFERENCES:
patent: 4669848 (1987-06-01), Wakabayashi

Affiliated with

Also associated with

Rating

Camera with changeable focal length does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Camera with changeable focal length, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera with changeable focal length will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-371764