| 摘要 |
PURPOSE:To prevent a strobe from emitting light unexpectedly owing to noise, etc., by generating the 2nd source voltage to be applied to a strobe circuit through the operation of the two-stage switch of a shutter release button. CONSTITUTION:When a release one-stage switch S1 is turned on, a transistor Tr2 turns on to operate a DC/DC converter 3, and consequently the 1st source voltage VB1 is generated, so that a light measurement and a range measurement are taken in this state. Then when a release two-stage switch S2 is turned on, the 2nd power supply signal PHS is outputted from a controller 4 a certain time later and a Tr7 turns on to generate the 2nd source voltage VB2. Therefore, the voltage VB2 is not applied to a Tr6 before the operation of the switch S2, so the Tr6 never turns on owing to a noises originating from the on operation of the switch S1, so that the strobe is prevented from emitting light unexpectedly. |
