Title:
OPTICAL APPARATUS
Document Type and Number:
Japanese Patent JP3145202
Kind Code:
B2
Abstract:
PURPOSE: To facilitate fine adjustment, to improve operability and to reduce the size and weight of the above apparatus by controlling a flange back adjustment with an electrically relative value and correcting the value thereof.
CONSTITUTION: An adjusting knob 12 is turned and the change thereof is detected by a detector 13 and is counted by a counter 14. The value of this counter 14 is stored into a memory 15A. A difference d between the value of the counter 14 and the memory 15 A is determined with the value of the counter 14 as input in a CPU 6 which judges the varying degrees of the rotating speed of the knob 12 from the magnitude of the difference d. The CPU corrects the moving quantity d' of a lens group by computation of d'=Kd2 (K: constant) in such a manner as to increase the moving quantity when the difference d is large and to decrease the moving quantity when the difference is small. The previously calculated difference d' is added to the memory 15B storing the flange back value and is again stored into the memory 15B in addition, the flange back value calculated by a display device, such as LCD, LED or analog meter, is displayed. Simultaneously, the value stored in the memory 15B is outputted to a lens position control section 7 which is turn moves the lens group.
Inventors:
Hisaichi
Noboru Suzuki
Noboru Suzuki
Application Number:
JP24624292A
Publication Date:
March 12, 2001
Filing Date:
September 16, 1992
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B7/08; G02B7/02; (IPC1-7): G02B7/08
Domestic Patent References:
| JP52204A | ||||
| JP4221944A | ||||
| JP58172605A | ||||
| JP4735205Y1 |
Attorney, Agent or Firm:
Masayuki Kishida (2 outside)