Lens unit for a camera

• US 4,404,595 A
• Filed: 12/31/1980
• Issued: 09/13/1983
• Est. Priority Date: 01/15/1980
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takimoto, Hiroyuki, Ushiro, Tatsuzo
• Primary Examiner(s): Masinick, Michael A.
• Application Number:
  US06/221,635
• Time in Patent Office: 986 Days
• Field of Search: 358/55, 358/225, 358/227, 358/228, 354/25, 354/38, 354/46, 354/43, 354/53, 354/195, 354/197, 354/198, 354/202, 354/270, 354/272, 354/286, 352/140
• US Class Current: 348/357
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/67 Focus control based on electronic image sensor signals

Abstract

This specification discloses a lens unit for a video camera which is provided with an image pickup lens, an automatic focus adjusting device for automatically focusing the image pickup lens onto an object, an automatic diaphragm device, connection means for connecting the automatic focus adjusting device to a power supply circuit on the camera body side, and connection means for connecting the automatic diaphragm device to a photometry signal (luminance signal) putting-out circuit on the camera body side.

Claims

1. A lens assembly for use with a camera body having electrical power supply circuit means, measured light signal providing means and zooming control means, said lens assembly comprising:

(A) a focus adjustable zoom lens system for image pick-up;

(B) an automatic focusing device for automatically adjusting the focus of said lens system onto an object;

(C) an automatic diaphragm device for automatically adjusting a diaphragm aperture in accordance with the measured light signal provided by said light signal providing means;

(D) an automatic zooming device for driving, under the control of said zooming control means, said lens system to effect zooming;

(E) means for connecting said automatic focusing device to said electric power supply circuit means;

(F) means for connecting said automatic diaphragm device to said measured light signal providing means; and

(G) means for connecting said automatic zooming device to said zooming control means.

2. A lens assembly according to claim 1, wherein said lens assembly is constructed as a unit separable with respect to said camera body and further comprises means for removably mounting said lens assembly to said camera body.

3. A lens assembly according to claim 1 or 2, wherein said automatic focusing device includes focus detecting means for producing an electrical indication representing the focusing condition of said lens system;

and said lens assembly further comprises means for transmitting to said camera body said electrical indication representing the focusing condition of the lens system which is produced by said focus detecting means, said transmitting means being electrically connected to said focus detecting circuit means.

4. A lens assembly according to claim 1 or 2, wherein said automatic focusing device includes in-focus distance indication producing means for producing an electrical indication representing the in-focus distance of said lens system;

and said lens assembly further comprises means for transmitting to said camera body said electrical indication representing the in-focus distance of the lens system which is produced by said in-focus distance indication producing means, said transmitting means being electrically connected to said in-focus distance signal producing means.

5. A lens assembly according to claim 1 or 2, wherein said automatic diaphragm device includes aperture value indication producing means for producing an electrical indication representing the adjusted diaphragm aperture value;

and said lens assembly further comprises means for transmitting to said camera body said electrical indication representing the adjusted aperture value which is produced by said aperture value indication producing means, said transmitting means being electrically connected to said aperture value signal producing means.

6. A lens assembly according to claim 1 or 2, wherein said automatic zooming device includes zooming condition detecting means for producing an electrical indication representing the zooming condition of said lens system;

and said lens assembly further comprising means for transmitting to said camera body said electrical indication representing the zooming condition of the lens system which is produced by said zooming condition detecting means, said transmitting means being electrically connected to said zooming condition detecting means.

7. A lens assembly according to claim 1 or 2, wherein said automatic focusing device has an operative state and an inoperative state, and said lens assembly further comprises:

manually operable switching means coupled to said automatic focusing device for switching the focusing device between the operative stage and the inoperative state.

8. A lens assembly according to claim 7, further comprising:

manually operable focusing means coupled to said lens system for manually focusing the lens system.

9. A lens assembly according to claim 3, wherein said automatic focusing device has an operative state and an inoperative state, and said lens assembly further comprises:

manually operable switching means coupled to said automatic focusing device for switching the focusing device between the operative state and the inoperative state.

10. A lens assembly according to claim 9, further comprising:

manually operable focusing means coupled to said lens system for manually focusing the lens system.

11. A lens assembly according to claim 4, wherein said automatic focusing device has an operative state and an inoperative state, and said lens assembly further comprises:

manually operable switching means coupled to said automatic focusing device for switching the focusing device between the operative state and the inoperative state.

12. A lens assembly according to claim 11, further comprising:

manually operable focusing means coupled to said lens system for manually focusing the lens system.

13. A lens assembly for use with a camera body having electrical power supply circuit means and information display means, said lens assembly comprising:

(A) a focus adjustable picture-taking lens system;

(B) an automatic focusing device for automatically adjusting the focus of said lens system onto an object, said automatic focusing device including focus detecting means for producing an electrical output representing the focusing condition of said lens system;

(C) means for connecting said automatic focusing device to said electrical power supply circuit means; and

(D) means for connecting the output of said focus detecting means in said automatic focusing device to said information display means to enable the display means to indicate the focusing condition of said lens system in accordance with the electrical output of said focus detecting means.

14. A lens assembly according to claim 13, wherein said lens assembly is constructed as a unit separable with respect to said camera body and further comprises means for removably mounting said lens assembly to said camera body.

15. A lens assembly according to claim 13 or 14, wherein said camera body further has measured light signal providing means, and said lens assembly further comprises:

an automatic diaphragm device for automatically adjusting a diaphragm aperture in accordance with the measured light signal provided by said measured light signal providing means; and

means for connecting said automatic diaphragm device to said measured light signal providing means.

16. A lens assembly according to claim 15, wherein said automatic diaphragm device includes aperture value information producing means for producing an electrical output representing the adjusted diaphragm aperture value, and said lens assembly further comprises means for connecting the output of said aperture value information producing means to said information display means to enable the display means to display the diaphragm aperture value adjusted by the diaphragm device, on the basis of said electrical output of the aperture value information producing means.

17. A lens assembly according to claim 15, wherein said lens system includes a zoom portion and said camera body further has zooming control means, and wherein said lens assembly further comprises:

an automatic zooming device for driving, under the control of said zooming control means, said zoom portion of the lens system to effect zooming; and

means for connecting said automatic zooming device to said zooming control means.

18. A lens assembly according to claim 17, wherein said automatic zooming device includes zooming condition detecting means for producing an electrical output representing the zooming condition of said lens system, and said lens assembly further comprises means for connecting the output of said zooming condition detecting means to said information display means to enable the display means to indicate the zooming condition of the lens system in accordance with said electrical output of the zooming condition detecting means.

19. A lens assembly according to claim 13 or 14, wherein said lens system includes a zoom portion and said camera body further has zooming control means, and wherein said lens assembly further comprises:

an automatic zooming device for driving, under the control of said zooming control means, said zoom portion of the lens system to effect zooming; and

means for connecting said automatic zooming device to said zooming control means.

20. A lens assembly according to claim 19, wherein said automatic zooming device includes zooming condition detecting means for producing an electrical output representing the zooming condition of said lens system, and said lens assembly further comprises means for connecting the output of said zooming condition detecting means to said information display means to enable the display means to indicate the zooming condition of the lens system in accordance said electrical output of the zooming condition detecting means.

21. A lens assembly according to claim 13 or 14, wherein said automatic focusing device includes in-focus distance information producing means for producing an electrical output representing the in-focus distance of said lens system, and said lens assembly further comprises means for connecting the output of said in-focus distance information producing means to said information display means to enable the display means to display the in-focus distance of the lens system in accordance with said electrical output of the in-focus distance information producing means.

22. A lens assembly according to claim 21, wherein said automatic focusing device has an operative and an inoperative state and said lens assembly further comprises;

manually operable switching means coupled to said automatic focusing device for switching the focusing device between the operative state and the inoperative state.

23. A lens assembly according to claim 22, further comprising:

manually operable focusing means coupled to said lens system for manually focusing the lens system.

24. A lens assembly according to claim 13 or 14, wherein said automatic focusing device has an operative state and an inoperative state, and said lens assembly further comprises:

manually operable switching means coupled to said automatic focusing device for switching the focusing device between the operative state and the inoperative state.

25. A lens assembly according to claim 24, further comprising:

manually operable focusing means coupled to said lens system for manually focusing the lens system.

26. A camera comprising in combination:

(A) a camera body, having;

(A-1) electrical power supply circuit means; and

(A-2) information display means;

(B) a lens assembly, having;

(B-1) a focus adjustable picture-taking lens system; and

(B-2) an automatic focusing device for automatically adjusting the focus of said lens system onto an object, said automatic fucosing device including focus detecting means for producing an electrical output representing the focusing condition of said lens system; and

(C) a coupling device between said camera body and said lens assembly, and having;

(C-1) means for connecting said camera body and said lens assembly;

(C-2) means for electrically connecting said automatic focusing device and said electrical power supply circuit means; and

(C-3) means for electrically connecting the output of said focus detecting means on said automatic focusing device and said information display means to enable the display means to indicate the focusing condition of said lens system in accordance with said electrical output of the focus detecting means.

27. A camera according to claim 26, wherein said lens assembly is constructed as a unit separable with respect to said camera body.

28. A camera according to claim 26 or 27, wherein said camera body further has light measuring means for providing a measured light signal related to an object light;

wherein said lens assembly further has an automatic diaphragm device for automatically adjusting a diaphragm aperture in accordance with the measured light signal provided by said light measuring means; and

wherein said coupling device further has means for electrically connecting said automatic diaphragm device with said light measuring means.

29. A camera according to claim 28, wherein said automatic diaphragm device includes aperture value information producing means for producing an electrical output representing the adjusted diaphragm aperture value;

and wherein said coupling device further has means for electrically connecting the output of said aperture value information producing means and said information display means to enable the display means to display the diaphragm aperture value adjusted by the diaphragm device, in accordance with of said electrical output of the aperture value information producing means.

30. A camera according to claim 26 or 27, wherein said lens system includes a zoom portion;

wherein said camera body has zooming control means;

wherein said lens assembly further has an automatic zooming device for driving, under the control of said zooming control means, said zoom portion of the lens system to effect zooming; and

wherein said coupling means further has means for electrically connecting said automatic zooming device and said zooming control means.

31. A camera according to claim 29, wherein said automatic zooming device includes zooming condition detecting means for producing an electrical output representing the zooming condition of said lens system;

and wherein said coupling device further has means for electrically connecting the output of said zooming condition detecting means and said information display means to enable the display means to indicate the zooming condition of the lens system in accordance with said electrical output of the zooming condition detecting means.

32. A camera according to claim 26 or 27, wherein said automatic focusing device includes in-focus distance information producing means for producing an electrical output representing the in-focus distance of said lens system;

and said coupling device further has means for electrically connecting the output of said in-focus distance information producing means and said information display means to enable the display means to display the in-focus distance of the lens system in accordance with said electrical output of the in-focus distance information producing means.

33. A camera according to claim 26 or 27, wherein said automatic focusing device has an operative and an inoperative state, and said lens assembly further has manually operable switching means coupled to said automatic focusing device for switching the focusing device between the operative state and the inoperative state.

34. A camera according to claim 33, wherein said lens assembly further has manually operable focusing means coupled to said lens system for manually focusing the lens system.

35. A camera comprising in combination:

(A) a camera body, having;

(A-1) electrical power supply circuit means;

(A-2) light measuring means for providing a measured light signal related to an object light;

(A-3) zooming control means;

(B) a lens assembly, having;

(B-1) a focus adjustable zoom lens system for image pick-up;

(B-2) an automatic focusing device for automatically adjusting the focus of said lens system onto an object;

(B-3) an automatic device for automatically adjusting a diaphragm aperture in accordance with the measured light signal provided by said light measuring means; and

(B-4) an automatic zooming device for driving, under the control of said zooming control means, said lens system to effect zooming; and

(C) a coupling device between said camera body and said lens assembly, and having;

(C-1) means for connecting said camera body and said lens assembly;

(C-2) means for electrically connecting said automatic focusing device and said power supply circuit means;

(C-3) means for electrically connecting said automatic diaphragm device and said light measuring means; and

(C-4) means for electrically connecting said automatic zooming device and said zooming control means.

36. A camera according to claim 35, wherein said lens assembly is constructed as a unit seprate with respect to said camera body.

37. A camera according to claim 35 or 36, wherein said automatic focusing device includes focus detecting means for producing an electrical indication representing the focusing condition of said lens system;

and wherein said coupling device further has means for transmitting to said camera body said electrical indicationl representing the focusing condition of the lens system which is produced by said focus detecting means.