Title:
LIGHT MEASURING APPARATUS
Document Type and Number:
Japanese Patent JPH08201170
Kind Code:
A
Abstract:
PURPOSE: To easily obtain an accurate photometric result by simple calculating method without applying a load to a microcomputer, a memory, etc., for forming a correcting unit and a controller.
CONSTITUTION: The light measuring apparatus comprises a photo-electric converter 12 for photoelectrically converting a light from an object, output circuits 13, 14 for outputting the information of the converter 12, a logarithmic converter 15 for logarithmically compressing the outputs of the circuits 13, 14, and a corrector 16 for correcting the outputs of the circuits 13, 14, wherein the corrector 16 corrects the outputs of the circuits 13, 14 after logarithmic compressing it by the converter 15.
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Inventors:
IWASAKI HIROYUKI
Application Number:
JP840695A
Publication Date:
August 09, 1996
Filing Date:
January 23, 1995
Export Citation:
Assignee:
NIKON CORP
International Classes:
G01J1/44; G03B7/091; H01L31/10; (IPC1-7): G01J1/44; G03B7/091
Attorney, Agent or Firm:
Hisao Kamata (1 person outside)