Title:
SYNCHRONIZING SIGNAL GENERATOR
Document Type and Number:
Japanese Patent JPS63244970
Kind Code:
A
Abstract:
PURPOSE:To suppress the fluctuation of a synchronizing signal due to the fluctuation in the quantity of light of a scanning light beam and the fluctuation in a beam diameter by one photodetector by delaying the output signal of the photodetector in a delay circuit and generating the synchronizing signal by the output signal of the delay circuit and the output signal of the photodetector. CONSTITUTION:The photodetector 1 outputs a signal according to the quantity of light of the scanning light beam and the beam diameter. The delay circuit 2 delays the output signal of the photodetector 1 by a prescribed time. A differential amplifier 3 amplifies a difference between the output signal of a photodetecting circuit 1 and the output signal of the delay circuit 2. This output signal is compared with a reference voltage in a comparator 4 to output the synchronizing signal.
More Like This:
Inventors:
TAKEYAMA YOSHINOBU
Application Number:
JP7699787A
Publication Date:
October 12, 1988
Filing Date:
March 30, 1987
Export Citation:
Assignee:
RICOH KK
International Classes:
B41J2/44; B41J3/00; H04N1/36; (IPC1-7): B41J3/00; H04N1/36
Domestic Patent References:
| JPS63135319U | 1988-09-06 |
Attorney, Agent or Firm:
Toru Kabayama