Patent ID: 8790950

Claim:
A method of manufacturing an optical sensor, comprising: providing a semiconductor wafer including a plurality of pixel areas; providing a light transmissive substrate including a light transmissive wafer with a plurality of light transmissive members attached thereto, the plurality of light transmissive members being arranged on a first main surface of the light transmissive wafer and each of the plurality of light transmissive members emitting α rays, an amount of the α rays being smaller than or equal to 0.05 c/cm 2 ·h (counts per square centimeter per hour); fixing the light transmissive substrate onto the semiconductor wafer by a fixing member so that the plurality of light transmissive members and the semiconductor wafer face each other; and dividing the fixed semiconductor wafer and the light transmissive substrate into individual pieces, wherein the light transmissive members are formed of silicate glass.