| 摘要 |
<p>PURPOSE:To secure an easy and accurate setting for the degree of exposure by processing the readings of the steady light and the steady light piled on by the flash light through the microcomputer and securing automatic calculation and display for the effect by which only the flash light can contribute to the subject. CONSTITUTION:When the exposure meter is turned to the subject and switch 16 is closed, transistor 6 and 14 conduct via control circuit 17. And at the same time transistor 13 becomes nonconductive, and the flash light is emitted. Thus photo detector 1 receives the steady light piled on by the flash light, and the photometric voltage integrated value of the steady light piled on by the flash light which received the logarithmic compression via capacitor 12 and the like is applied to microcomputer 23 via A/D converter 15. After the lapse of the flash light time, the digital photometric voltage of the steady light is supplied in the same way to computer 23. Then computer 23 calculates the exposure value caused by only the flash light in accordance with the photometric voltage difference of both sides and the set exposure control value obtained through shutter speed control circuit 27 and film sensitivity setting circuit 28. And the necessary exposure value is displayed on display units 29-31.</p> |
