Image sensing apparatus

• US 5,057,927 A
• Filed: 08/08/1989
• Issued: 10/15/1991
• Est. Priority Date: 08/31/1988
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hieda, Teruo
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Greening, Wendy R.
• Application Number:
  US07/391,128
• Time in Patent Office: 798 Days
• Field of Search: 358/228, 358/213.19, 358/909, 358/219, 354/456, 354/451, 354/452, 354/446, 354/455
• US Class Current: 348/363
• CPC Class Codes: G03B 7/085 for control of aperture
• CPC Class Codes: H04N 23/663 for controlling interchangeable camera parts based on electronic image sensor signals
• CPC Class Codes: H04N 23/70 Circuitry for compensating brightness variation in the scene
• CPC Class Codes: H04N 23/75 by influencing optical camera components

Abstract

An image sensing apparatus has a diaphragm for an imaging optical system, a selecting switch for switching between automatic control and manual control of the diaphragm, and a diaphragm controlling circuit capable of controlling and varying the operating speed of the diaphragm. The image sensing apparatus is arranged to switch and vary the operating speed of the diaphragm in accordance with the setting of the selecting switch.

Claims

1. An image sensing apparatus comprising:

a diaphragm for an imaging optical system;

switching means for switching automatic control and manual control of said diaphragm; and

controlling means for switching operating speeds of said diaphragm in accordance with a switching operation of said switching means.

2. An image sensing apparatus according to claim 1, wherein said imaging optical system is detachably mounted on said imaging sensing apparatus.

3. An image sensing apparatus according to claim 1, wherein said controlling means is arranged to reduce the operating speed of said diaphragm during said automatic control compared to that during said manual control.

4. An image sensing apparatus according to claim 2, wherein said switching means is provided in said image sensing apparatus.

5. An image sensing apparatus comprising:

(a) image sensing means;

(b) exposure means for controlling the exposure condition of said image sensing means; and

(c) controlling means arranged to be switchable between a first mode for controlling said exposure means by employing an output signal of said image sensing means and a second mode which allows manual control of said exposure means, said controlling means varying operating speed characteristics of said exposure means in accordance with the switchover between said first mode and said second mode.

6. An image sensing apparatus according to claim 5, wherein said exposure means is detachably mounted on a body including said image sensing means.

7. An image sensing apparatus according to claim 5, wherein said controlling means reduces the speed of operational response of said exposure means in said second mode compared to that in said first mode.

8. An image sensing apparatus according to claim 5, wherein said exposure means comprises a diaphragm member.

9. An image sensing apparatus according to claim 5, wherein said exposure means is controlled by an electrical signal caused by a manual operating member in said second mode.

10. A lens unit detachably mounted to a camera body comprising:

(a) an exposure means for changing an exposure condition for a light receiving means in said camera body;

(b) switching means for switching between automatic control and manual control of said exposure means in response to a switching signal; and

(c) control means for controlling response characteristics of said exposure means in response to said switching signal.

11. A lens unit according to claim 10, wherein said exposure means includes a diaphragm.

12. A lens unit according to claim 10, wherein said response characteristics include a speed response characteristic.

13. A lens unit according to claim 10, wherein said light receiving means includes image sensing means.

14. A lens unit according to claim 13, wherein said image sensing means includes a pickup means.

15. A lens unit according to claim 10, said camera body further comprising signal generating means for generating said switching signal.

16. A lens unit according to claim 15, said camera body further comprising a transmitting means for transmitting said switching signal to said lens unit.

17. A lens unit according to claim 16, comprising a receiving means for receiving said switching signal from said camera body.