Patent ID: 6936904

Claim:
An adjusting method for a single chip photo sensing device comprising a photoelectric transfer element for converting received light into an electric signal, a signal processing circuit for processing said electric signal of said photoelectric transfer element, and a thin-film resistor used for a circuit adjustment, said adjusting method comprising the steps of: connecting an ammeter to an output terminal of said photoelectric transfer element; irradiating reference light having a predetermined intensity on said photoelectric transfer element; storing a current value detected by said ammeter when said photoelectric transfer element is irradiated by said reference light; replacing said ammeter with a current generating source; supplying current from said current generating source to said signal processing circuit by an amount identical with said stored current value under a condition no light is irradiated on said photoelectric transfer element; and performing a laser trimming on said thin-film resistor to generate a desired output from said signal processing circuit as a result of the circuit adjustment.