Patent Number: 6,167,202

Title: Camera system or flash unit

Abstract: A camera system which performs light measurement by causing a flash unit to perform a preliminary emission before causing said flash unit to perform a main emission, and computes a control value for the main emission on the basis of a result of the light measurement, includes charge detecting circuitry for detecting a state of charge of a capacitor for storing energy to be used for emission of the flash unit, an upper limit value computer for computing an amount-of-emission upper limit value on the basis of a detection result provided by said charge detecting circuitry and decision circuitry for determining whether flash control under which the main emission can provide a correct amount-of-emission is possible, before the main emission on the basis of the control value and an amount-of-emission upper limit value computed by the upper limit value computer after the preliminary emission.

Inventors: Fukui; Hajime (Tokyo, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: G03B 7/16 (20060101); G03B 17/18 (20060101); G03B 15/05 (20060101); G03B 015/03 (); G03B 007/16 (); G03B 009/70 (); G03B 017/18 ()

Expiration Date: 12/26/2017