Patent ID: 7746457

Claim:
A light quantity measuring apparatus for measuring a quantity of light to be measured, comprising: a sensor that receives a quantity of light and generates charges according to the quantity of light received by the sensor; a storage that receives charges generated by the sensor and stores the charges generated by the sensor; an A/D converter that converts a quantity of the charges stored in the storage to a digital value; and a controller that adds up a plurality of digital values, wherein the controller also controls the light quantity measuring apparatus, wherein, under control of the controller, the sensor continuously generates charges according to the quantity of the received light to be measured during a measurement period without interruption, the storage stores the charges generated by the sensor in each of a plurality of storage periods obtained by dividing the measurement period without interruption, the A/D converter converts the quantity of charges stored in the storage in each of the plurality of storage periods to a digital value during receipt by the storage of the generated charges by the sensor, and the integrator adds up a plurality of digital values obtained by conversion of the A/D converter.