| 摘要 |
PURPOSE:To remove necessities to photography without a subject to be photographed or to open and close a cover of a camera for detecting an ASA sensitivity after a feed to an endscopic camera is stopped by detecting a piece of information about the ASA sensitivity in an interlock with a release action. CONSTITUTION:When a release switch 18 is closed, a release singal is generated and a monostable multivibrator 54 produces a pulse to permit transistors (TRs) 57, 63 to turns on, thereby allowing light emitting elements 59, 64 of an ASA sensiti vity detector 20 to be lighted. A reflected light from ASA coding parts 21, 22 enters light detecting elements 58, 65. From coding parts 21, 22 strong reflected light and weak reflected light are produced respectively and light level and low level voltage are applied to a decoder 67, thereby allowing an ASA sensitivity signal to be outputted. Further this signal passes through a storage circuit 68 and selects analog switches 70-72 and capacitors 73-76; and further through a comparator 46 the signal is sent to a light source device. Accordingly, it is unnecessary to photography without a subject to be photographed or to open and close a cover of a camera in order to detect an ASA sensitivity after a feed to an endscopic camera is stopped. |
