Patent ID: 6043480
Filing Date: 2000-03-28
Classification: G01J

Abstract:
A light measuring device comprising:a photo-detecting section whose output current varies according to an applied reverse bias voltage and which receives light from a measured object and outputs a current proportional to the intensity of the light;a bias section which generates a first reverse voltage to prevent the output current of said photo-detecting section from flowing and a second reverse bias voltage to allow the output current of said photo-detecting section to flow and applies the first reverse bias voltage and the second reverse bias voltage to said photo-detecting section;a direct-current amplifying section which outputs a signal whose level is proportional to the output current from said photo-detecting section; anda processing section which determines the intensity of light from said measured object from a first output from said direct-current amplifying section when said bias section is controlled so that said first reverse bias voltage may be applied to said photo-detecting section and a second output from said direct-current amplifying section when said bias section is controlled so that said second reverse bias voltage may be applied to said photo-detecting section.