Title:
PHOTOMETRIC DEVICE
Document Type and Number:
Japanese Patent JPH0493623
Kind Code:
A
Abstract:
PURPOSE:To enable brightness to be corrected with simple constitution by correcting digital information outputted from a photometric means with an adjustment value stored in a memory means on the basis of an output characteristic difference from the reference characteristic digital data of a data table means. CONSTITUTION:When a signal corresponding to a received light quantity is outputted from a photometric means CdS 10, the signal is digitized in an analog/ digital converter 12 and enters CPU 13. Also, the digitized signal is converted to a brightness value X0 on the basis of reference characteristic digital data of a data table means 15. Furthermore, the brightness value X0 is shifted in parallel (X0 + B) with a correction means 17 on the basis of the B value, according to an adjustment value stored in a memory means 16 for the brightness value X0, and then, shifted value is checked. If the value indicates low brightness, low brightness correction is made with an AL value. On the other hand, if the value indicates high brightness, high brightness correction is made with an AH value. The CPU 13 is, then, caused to output a brightness signal to a mechanical driver 14.
Inventors:
HATA DAISUKE
SUZUKI AKIRA
SUZUKI AKIRA
Application Number:
JP20519790A
Publication Date:
March 26, 1992
Filing Date:
August 03, 1990
Export Citation:
Assignee:
RICOH KK
International Classes:
G01J1/44; (IPC1-7): G01J1/44
Attorney, Agent or Firm:
Mitsuyama Murayama (1 person outside)
Next Patent: JPH0493624