Title:
SERVO CONTROLLER FOR TELEVISION LENS
Document Type and Number:
Japanese Patent JP2934068
Kind Code:
B2
Abstract:
PURPOSE: To vary the ratio of change of a focusing position to be small or large in the case of varying the focusing position of a zoom lens.
CONSTITUTION: A speed feedback signal Sf and a speed command signal Sc being output from a speed detector 12 which detects the speed of a motor 11 are connected to the input of a 1st arithmetic part 13. A difference signal St between the signals Sf and Sc is obtained in the 1st arithmetic part 13, and St2 is obtained in a 2nd arithmetic part 14 and multiplied by amplification degree Av in a 3rd arithmetic part 15. Then, previous control output data V0 is added to the obtained value in a 4th arithmetic part 16 and outputted to the motor 11 as control output V1.
Inventors:
YOSHIKAWA KAZUMASA
Application Number:
JP20237691A
Publication Date:
August 16, 1999
Filing Date:
July 16, 1991
Export Citation:
Assignee:
KYANON KK
International Classes:
G02B7/08; G05D3/12; H04N5/232; (IPC1-7): G02B7/08; G05D3/12; H04N5/232
Domestic Patent References:
| JP5140924A | ||||
| JP61249724A | ||||
| JP6146186A | ||||
| JP60162492A | ||||
| JP4814977A | ||||
| JP60181195U |
Attorney, Agent or Firm:
Hibiya Masahiko