Image sensing apparatus

• US 4,663,669 A
• Filed: 01/25/1985
• Issued: 05/05/1987
• Est. Priority Date: 02/01/1984
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kinoshita, Takao, Suga, Akira, Sakai, Shinji, Tojo, Akihiko
• Primary Examiner(s): Rubinson, Gene Z.
• Assistant Examiner(s): Brinich, Stephen
• Application Number:
  US06/694,842
• Time in Patent Office: 830 Days
• Field of Search: 358/213, 358/212, 358/221, 358/909, 357/24 LR
• US Class Current: 348/220.1
• CPC Class Codes: H01L 27/14831 Area CCD imagers
• CPC Class Codes: H04N 25/617 for reducing electromagnetic interference, e.g. clocking noise

Abstract

An image sensing apparatus comprises: a photodetector for converting an optical image to a charge signal; a recombination circuit for recombining a portion of the charges in the photodetector with the majority carrier; an instruction circuit for instructing change-over between the still mode, in which only one predetermined image signal is formed in the photodetector, and the movie mode, in which a plurality of image signals are formed; and a controller for switching the recombining capability by the recombination circuit during the formation of an image in accordance with an instruction output of the instruction circuit, in which the recombining capability in the still mode is controlled so as to be higher than that in the movie mode.

Claims

1. An image sensing apparatus comprising:

(a) image sensing means for converting an optical image to an electrical signal;

(b) recombining means for recombining a portion of charges in said image sensing means with the majority carrier; and

(c) recombination control means for making said recombining means operative for almost the whole of the horizontal blanking interval, for a first additional interval immediately before said horizontal blanking interval, and for a second additional interval which is shorter than said first additional interval and which is immediately after said horizontal blanking interval, when the electrical signal in said image sensing means is read out at a standard television period.

2. An image sensing apparatus according to claim 1, wherein said image sensing means includes a CCD.

3. An image sensing apparatus according to claim 1, wherein said recombining means includes a recombination electrode to control a potential in said image sensing means.

4. An image sensing apparatus according to claim 3, wherein said image sensing means has a transfer electrode to read out the charges and said recombination electrode is provided independently of said transfer electrode.

5. An image sensing apparatus according to claim 1, wherein said recombination control means allows said recombining means to periodically perform the recombining operation.

6. An image sensing apparatus according to claim 1, further comprising clamping means for clamping an output of said image sensing means.

7. An image sensing apparatus according to claim 6, wherein said recombination control means does not change the operating state of said recombining means during the clamping operation of said clamping means.

8. An image sensing apparatus comprising:

(a) first and second regions for converting incident light to charges;

(b) recombining means for recombining a portion of the charges in said second region with the majority carrier;

(c) instructing means for instructing the recording of a still image;

(d) control means for allowing the charges to be respectively stored in said first and second regions for a predetermined interval in response to an instruction of said instructing means, and for driving said recombining means and thereafter adding the charges in said first and second regions and reading them out; and

(e) recording means for recording the signal read out for only one image.

9. An image sensing apparatus according to claim 8, wherein said recombining means includes a recombination electrode to control a potential in said second region.

10. An image sensing apparatus according to claim 9, wherein said first and second regions include means for transferring the charges and said recombination electrode is provided independently of said charge transfer means.

11. An image sensing apparatus according to claim 8, wherein said control means allows said recombining means to periodically perform the recombining operation.

12. An image sensing apparatus according to claim 8, further comprising clamping means for clamping the read out signal.

13. An image sensing apparatus according to claim 12, wherein said control means holds constant the operating state of said recombining means during the clamping operation of said clamping means.

14. An image sensing apparatus according to claim 8, wherein said recording means records the signal corresponding to one picture plane, said signal comprising one field.

15. An image sensing apparatus according to claim 8, wherein said recording means records the signal corresponding to one picture plane, said signal comprising two fields.

16. An image sensing apparatus comprising:

(a) a photodetecting section for converting an optical image to a charge signal;

(b) recombining means for recombining a portion of charges in said photodetecting section with the majority carrier;

(c) instructing means for instructing a changeover between a still mode in which only an image signal corresponding to one predetermined picture plane is formed in said photodetecting section and a movie mode in which a plurality of image signals are formed; and

(d) control means for switching a recombining capability of said recombining means during the formation of an image in accordance with an instruction output of said instructing means,

wherein said recombining capability in the still mode is controlled so as to be higher than said recombining capability in the movie mode.

17. An image sensing apparatus according to claim 16, wherein said photodetecting section includes a CCD.

18. An image sensing apparatus according to claim 16, wherein said recombining means includes an electrode to control the potential state in said photodetecting section.

19. An image sensing apparatus according to claim 18, wherein said control means allows said recombining means to periodically perform the recombining operation.

20. An image sensing apparatus according to claim 16, further comprising clamping means for clamping the signal formed in said photodetecting section.

21. An image sensing apparatus according to claim 20, wherein said control means holds constant the operating state of said recombining means during the clamping operation of said clamping means.

22. An image sensing apparatus according to claim 16, wherein said instruction means allows the image signal corresponding to one field to be formed in said photodetecting section in the still mode.

23. An image sensing apparatus according to claim 16, wherein said instructing means allows the image signal corresponding to two fields to be formed in said photodetecting section in the movie mode.

24. An image sensing apparatus according to claim 16, wherein said instructing means allows the charges to be stored in the same number of pixels in the still mode as in the movie mode.

25. An image sensing apparatus comprising:

(a) image sensing means for picking up an optical image;

(b) control means for allowing charges in said image sensing means to be combined periodically with charges of the opposite polarity; and

(c) instructing means for switching charge combination characteristics of said control means in accordance with an image pickup quantity using said image sensing means.

26. An image sensing apparatus according to claim 25, wherein said control means controls a potential in said image sensing means.

27. An image sensing apparatus according to claim 25, wherein said instructing means can instruct the image pickup of a still image and the image pickup of a movie image.

28. An image sensing apparatus according to claim 25, wherein said instructing means can instruct the recording of a still image and the recording of a movie image.

29. An image sensing apparatus according to claim 25, wherein said instructing means switches the combining capability of the charges in accordance with the image pickup quantity.

30. An image sensing apparatus comprising:

(a) image sensing means for picking up an optical image;

(b) readout means for periodically reading out an output of said image sensing means; and

(c) control means for allowing charges in said image sensing means to be combined with charges of the opposite polarity during an interval when said periodic readout operation is stopped and at the leading time and trailing time of said periodical readout operation.