| 摘要 |
PURPOSE:To attain effective use of a light reflected from a surface of an incident light for photometry, by changing an inrradiated quantity of light of a solid-state image pickup element with a control signal obtained from the level comparison between a photometry signal and a predetermined reference exposure signal. CONSTITUTION:A light irradiated from a diagnostic lamp 24 to an object in a body cavity is made incident to a CCD50 of a camera section 20 as a reflecting light. The CCD50 is scanned with a drive circuit 52 and a picture signal is applied to a TV signal processing circuit 56. The picture signal processed at the circuit 56 is recorded on a recorder 36 as a usual TV signal. To obtain an adequate exposure, a photometry signal obtained by detecting a reflecting light 60 from the glass surface of the CCD50 at a photo diode 62 is applied to a comparator 66 in an optical device 18. The photometry signal is compared with the preset reference voltage at the comparator 66, and this comparison output signal controls the quantity of light of the diagnostic lamp 24. |
