Film feeding apparatus for camera

• US 4,690,533 A
• Filed: 11/14/1985
• Issued: 09/01/1987
• Est. Priority Date: 12/04/1984
• Status: Expired due to Term

• Current Assignee: Nikon Corporation
• Original Assignee: Nippon Kogaku K. K. (Nikon Corporation)
• Inventors: Kazami, Kazuyuki, Wakabayashi, Hiroshi
• Primary Examiner(s): Perkey, W. B.
• Application Number:
  US06/797,970
• Time in Patent Office: 656 Days
• Field of Search: 354/173.1, 354/173.11
• US Class Current: 396/408
• CPC Class Codes: G03B 17/02 Bodies
• CPC Class Codes: G03B 17/425 motor drive cameras

Abstract

A film feeding apparatus for a camera to feed a film from a cartridge is so structured that preparatory wind-up starts not immediately after a close signal indicating that a rear cover is closed is generated, but after a predetermined delay time elapses from generation of the close signal, i.e., after the rear cover is completely closed. The film feeding apparatus will not undesirably expose a film even if a rear cover detection switch is operated before a rear cover is completely closed.

Claims

1. A film feeding apparatus for a camera to feed a film from a cartridge, comprising:

rear cover detection moans for detecting closing of a rear cover of a camera so as to generate a close signal;

a delay circuit which starts counting upon reception of the close signal and generates a delay signal after a predetermined time elapses from reception of the close signal; and

feed means, including a motor, for energizing the motor upon reception of the delay signal so as to successively feed a film from the cartridge.

2. An apparatus according to claim 1, wherein said apparatus further includes;

feed detection means for detecting that a frame to be exposed first faces an imaging lens by continuous feeding operation by said feed means so as to generate a feed detection signal, and said feed means is inhibited from being operated upon reception of the feed detection signal, thereby disabling the continuous feeding operation.

3. An apparatus according to claim 1, wherein said apparatus further includes;

film detection means for detecting absence of the film in the camera so as to generate an absence signal, and

said feed means is inhibited from operating said motor upon reception of the absence signal irrespective of the delay signal.

4. An apparatus according to claim 1, wherein said apparatus further includes;

film detection means for detecting absence of the film in the camera so as to generate an absence signal, and

said delay circuit is inhibited from counting upon reception of the absence signal irrespective of the close signal.

5. An apparatus according to claim 1, wherein said delay circuit resets a counting operation and cannot generate the delay signal when the rear cover is opened during the counting operation and the close signal is disabled.

6. An apparatus according to claim 1, wherein said delay circuit stops generating the delay signal when the rear cover is opened and the close signal is disabled while the delay signal is generated, and said feed means stops said motor so as to interrupt the feeding of the film when the delay signal is disabled.

7. An apparatus according to claim 1, wherein said feed means stops said motor, thereby disabling the feeding of the film.

8. A film feeding apparatus for a camera to feed a film from a cartridge, comprising:

rear cover detection means for detecting the closing of a rear cover of said camera so as to generate a close signal;

a delay circuit responsive to said close signal for counting a predetermined time and generating a delay signal after said predetermined time is counted;

a motor for feeding said film from said cartridge; and

energizing means responsive to said delay signal for energizing said motor so that said motor starts feeding said film from said cartridge.

9. An apparatus according to claim 8, which further comprises feed detection means for detecting that a first frame of said film to be exposed faces an imaging lens and thereafter producing a feed detection signal, wherein said energizing means inhibits said motor from feeding said film from said cartridge in response to said feed detection signal.

10. An apparatus according to claim 8, which further comprises film detection means for detecting the absence of said film in the camera so as to generate an absence signal, and wherein said energizing means inhibits said motor from feeding said film from said cartridge in response to said absence signal irrespective of said delay signal.

11. An apparatus according to claim 8, which further comprises film detection means for detecting the absence of said film in the camera so as to generate an absence signal and means for inhibiting said delay circuit from counting said predetermined time in response to said absence signal irrespective of said close signal.

12. An apparatus according to claim 8, wherein said delay circuit stops counting said predetermined time in response to opening of said rear cover.