Camera in order to obtain good color image and video time with automatic control mode. The way out is through the video signal average or peak - peak, judge the brightness of the scene changes. To which the aperture imaging is optimized. Panasonic NV - M9000 automatic control of camera aperture is to control the luminous flux into the CCD. yb5service manual download site
 yb5service manual download site
Make shooting scenery to achieve the best effect of imaging. The appended drawings for the machine aperture of the automatic control circuit diagram, combined with the machine frame below the working principle of aperture of the automatic control system is introduced in this paper yb5service manual download site
 yb5service manual download site
The working principle of yb5service manual download site
 yb5service manual download site
 yb5service manual download site
The machine from the CCD image sensor output video signal part is used as the luminous flux detection. After detection compared with the reference level, form error signal adjusting aperture motor, make the camera on the stable output signal level at a predetermined reference level. The circuit work process, when the aperture control switch in the automatic mode, reflection of light by the aperture of the lens is exposed to the CCD photosensitive surface, video image signal by CCD output sample hold to portent put processing circuit IC203 (AN2013SB), then the IC204 (LM358DB) clamp, blanking, into IC307 (MN655431SH) for digital processing, then through IC309 (MN1882010V4D) A/D conversion into digital video signal. The video CCD output signal level is associated with the aperture size, aperture, large aperture video output signal level is high; On the other hand, the video output signal level is low. In the digital processing block IC310 (AK6420F) have all kinds of internal preset under the illumination of the video level standard, the standard values and compared after the digital video signal error signal, meridians width modulation, from IC330 output (M62352GP) 7 foot, then through capacitance C311 and resistance R301 smooth filtering into dc level, add to the aperture control comparison block IC704 (LM358DB) (5) feet. Set beside the aperture of the aperture size of aperture sensor state information sent to the aperture is block IC703 (7), foot AN2585FAP), enlarged by the internal circuit, output to attending pet-name ruby from the feet, compared with attending foot input reference voltage, produce the error of the output voltage from 12 feet, add to IC704 6 feet. VR701 for aperture aperture adjustment potentiometer. Can change the aperture control sensitivity. IC704 dc level 6 feet high and low state information reflecting the aperture size. The two level via IC704 comparison.

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