| 摘要 |
PURPOSE:To automatically detect a detection point useful for the photographic effect and obtain a photograph with an adequate film blackening, by relatively comparing output signals at a plurality of detection points and logically deciding their comparison results. CONSTITUTION:Outputs of photoelectric converters 4-6 are input to integrators 7 integrated values of which are compared with the reference voltage of a reference voltage generator 9 in comparators 8. Outputs of the comparators 8 are fed to an X-ray disconnecting circuit 13 through gate circuits 12. Control signals for switching said gate circuits 12 are generated by applying output signals of the photoelectric converters 4-6 to a gate control signal generating circuit 14 through a divider 10 and logical decision circuit 11. |
