Patent ID: 6733821
Filing Date: 2004-05-11
Classification: C23C,G02B

Abstract:
An optical component producing method for forming a multi-layer film, on a base, comprising:depositing a lower refractive index layer on said base and a higher refractive index layer on said lower refractive index layer; alternating said lower refractive index layer with said higher refractive index layer for a plurality of layers forming a basis for a stack; depositing a tuning layer having a higher refractive index on said plurality of layers, thus forming the stack; measuring an optical characteristic of the optical component obtained by forming the stack on the base, wherein the measurement step comprises measuring a transmittance of the optical component formed from the stack during depositing of said tuning layer; controlling, on a basis of the measured optical characteristic of the optical component, a thickness of said tuning layer by terminating the film formation at said tuning layer when the measured transmittance of the optical component is changed to be decreased; removing a layer portion formed during a period of time from a time point when the increase/decrease of the measured mean light transmittance of the optical component is stopped to a time point when the measured mean light transmittance is changed to be decreased; and depositing a lower refractive index layer on said tuning layer, thereby forming the multi-layer film.