Camera

• US 5,122,824 A
• Filed: 11/13/1990
• Issued: 06/16/1992
• Est. Priority Date: 11/17/1989
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hayashi, Naohiko
• Primary Examiner(s): Gellner, Michael L.
• Application Number:
  US07/612,620
• Time in Patent Office: 581 Days
• Field of Search: 354/266, 354/267.1
• US Class Current: 396/59
• CPC Class Codes: G03B 17/40 with delayed or timed action
• CPC Class Codes: G03B 7/08 Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
• CPC Class Codes: G03B 7/0807 Control circuits G03B7/10 takes precedence
• CPC Class Codes: G03B 7/097 for control of both exposure time and aperture
• CPC Class Codes: G03B 7/16 in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera

Abstract

A camera comprises an exposure device for making an exposure; a signal receiving circuit for receiving a remote-control signal; and a control circuit for a bulb exposure. The control circuit is arranged to cause the exposure device to begin the exposure in response to reception of the remote-control signal by the signal receiving circuit and, after that, to cause the exposure device to terminate the exposure in response to reception of another remote-control signal by the signal receiving circuit.

Claims

1. A camera comprising:

a) exposure means for performing an exposure action;

b) signal receiving means for receiving a remote-control signal; and

c) control means for making a bulb exposure by causing said exposure means to begin the exposure action in response to reception of the remote-control signal by said signal receiving means and by causing said exposure means to terminate the exposure action in response to subsequent reception of the remote-control signal by said signal receiving means.

2. A camera according to claim 1, wherein said control means includes means for terminating the exposure action of said exposure means in response to a release operation performed on the side of the camera during said bulb exposure.

3. A camera according to claim 1, wherein said control means includes means for causing said exposure means to begin the exposure action in response to reception of the remote-control signal by said signal receiving means and for causing said exposure means to terminate the exposure action in response to the next reception of the remote-control signal by said signal receiving means.

4. A camera according to claim 1, further comprising bulb exposure mode setting means for setting a bulb exposure mode, and wherein said control means includes means for allowing, in response to setting of the bulb exposure mode by said bulb exposure mode setting means, the bulb exposure to be made by using the remote-control signal.

5. A camera according to claim 4, wherein said control means includes means for causing, when said bulb exposure mode setting means does not set the bulb exposure mode, said exposure means not to terminate the exposure action in response to reception of the remote-control signal by said signal receiving means.

6. A camera according to claim 1, further comprising second bulb exposure mode setting means for setting a second bulb exposure mode for causing said exposure means to begin and terminate the exposure action in response to a release operation performed on the side of the camera, and wherein said control means includes means for causing, when said second bulb exposure mode setting means sets said second bulb exposure mode, the bulb exposure not to be made by using the remote-control signal.

7. A camera according to claim 1, further comprising timer means for bringing said signal receiving means into a signal-receivable state for a predetermined period of time.

8. A camera according to claim 7, further comprising signal-receivable state maintaining means for maintaining the signal-receivable state of said signal receiving means in preference to said timer means in response to beginning of the bulb exposure by said control means.

9. A camera according to claim 1, further comprising timer means for bringing said signal receiving means into a signal-receivable state at intervals of a predetermined period of time.

10. A remote-control device of a camera, comprising:

a) signal receiving means for receiving a remote-control signal;

b) control means for controlling a bulb exposure by ordering an exposure action to be begun in response to reception of the remote-control signal by said signal receiving means and by ordering the exposure action to be terminated in response to subsequent reception of the remote-control signal by said signal receiving means.

11. A device according to claim 10, wherein said control means includes means for ordering the exposure action to be terminated in response to a release operation performed on the side of the camera during said bulb exposure.

12. A device according to claim 10, wherein said control means includes means for ordering the exposure action to be begun in response to reception of the remote-control signal by said signal receiving means and for ordering the exposure action to be terminated in response to the next reception of the remote-control signal by said signal receiving means.

13. A device according to claim 10, further comprising bulb exposure mode setting means for setting a bulb exposure mode, and wherein said control means includes means for ordering, in response to setting of the bulb exposure mode by said bulb exposure mode setting means, the bulb exposure to be made by using the remote-control signal.

14. A device according to claim 13, wherein said control means includes means for not ordering, when said bulb exposure mode setting means does not set the bulb exposure mode, the exposure action to be terminated in response to reception of the remote-control signal by said signal receiving means.

15. A device according to claim 10, further comprising second bulb exposure mode setting means for setting a second bulb exposure mode for ordering the exposure action to be begun and terminated in response to a release operation performed on the side of the camera, and wherein said control means includes means for not ordering, when said second bulb exposure mode setting means sets said second bulb exposure mode, the bulb exposure to be made by using the remote-control signal.

16. A device according to claim 10, further comprising timer means for bringing said signal receiving means into a signal-receivable state for a predetermined period of time.

17. A device according to claim 16, further comprising signal-receivable state maintaining means for maintaining the signal-receivable state of said signal receiving means in preference to said timer means in response to beginning of the bulb exposure by said control means.

18. A device according to claim 10, further comprising timer means for bringing said signal receiving means into a signal-receivable state at intervals of a predetermined period of time.