Title:
DIVIDED PHOTOMETRIC DEVICE
Document Type and Number:
Japanese Patent JPH03144320
Kind Code:
A
Abstract:
PURPOSE:To simplify a circuit and to shorten a processing time by making judgement on the necessity of evaluation photometry and by conducting a processing therefor only when it is necessary. CONSTITUTION:A central processing device 6 makes a decoder 3 operate at a sampling interval being narrower sufficiently than the frequency of an estimated flicker of a light source. The whole of photometric elements 2 is selected at this sampling interval, and outputs are subjected to sampling and A/D conversion in a plurality of times. When the outputs thereof show nonuniformity of a prescribed degree or above, data determined previously are taken, and when they show no uniformity of the prescribed degree or above, discrete data of the multi-division photometric elements 2 are taken. In this way, an A/D converted value being necessary for evaluation photometry is obtained from the multi-division photometric elements 2 only when it is needed, in consideration of the effect of the flicker of an AC light source for illumination, and thereby a photometric value can be obtained in a relatively short time.
More Like This:
Inventors:
HIROOKA MASAMICHI
IKEDA YUICHI
IKEDA YUICHI
Application Number:
JP28413189A
Publication Date:
June 19, 1991
Filing Date:
October 31, 1989
Export Citation:
Assignee:
KYOCERA CORP
International Classes:
G01J1/44; G03B7/28; (IPC1-7): G01J1/44
Previous Patent: CONTROLLING TRANSMISSION METHOD FOR ELECTRONIC RATE BALANCE
Next Patent: FLUIDIZATION TREATMENT METHOD
Next Patent: FLUIDIZATION TREATMENT METHOD