Patent ID: 6067422
Filing Date: 2000-05-23
Classification: G03B

Abstract:
A camera system arranged to cause a preliminary emission to be performed before a main emission is performed and execute control of the main emission according to a result of light measurement performed during the preliminary emission, comprising:(a) a light receiving circuit for receiving a light beam of the preliminary emission without being reflected by an object and forming an output corresponding to an emission amount of the preliminary emission by multiplication of the signal of the received light beam,(b) a light measuring circuit for measuring brightness of the object at the time of the preliminary emission,(c) a data forming circuit for providing information about a ratio of an emission amount of the main emission to an emission amount of the preliminary emission on the basis of the brightness of the object at the time of the preliminary emission and forming control data for controlling the main emission amount on the basis of an output corresponding to the preliminary emission amount formed by the light receiving circuit;(d) a control circuit for controlling the amount of the main emission on the basis of the control data supplied from said data forming circuit; and(e) a correcting circuit for correcting the control data according to camera condition data, a state of a flash unit or the kind thereof or an operating state of the flash unit.