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10
2. CAMERA CIRCUIT
2-1. Record Mode
Dichroic Prism
The incident light that is introduced from the lens block, is adjusted of its amount
by iris and enters the dichroic prism.
The incident light is separated into the three primary spectrum of R, G and B.
CCD Imager (IC100, IC101, IC102)
The CCD imager is driven by the pulses (V1 to V3, H1, H2 and PG) that are
supplied from the timing generator.
The incident light to the CCD imager is converted to the electrical signals of R,
G and B.
Sample-and-hold, AGC (IC203)
The output signal from the CCD imager is sample-and-held by the signals
(XSHIP, XSHD) that are supplied from the timing generator. The sample-and-
hold is performed in order to ensure operation of the A/D conversion at the latter
circuit. When the signal amplitude after sample-and-hold is small, the signal is
amplified by the AGC amplifier to obtain the sufficient amplitude.
The right end and the left end of B signal output that is introduced to this IC
from the CCD imager, is horizontally inverted due physical structure of the
dichroic prism.
A/D Converter (IC206, IC205, IC207)
The R. G. B. video signal that are output from the sample-and-hold (IC203) are
converted from analog signal to 10-bit digital signal in accordance with the
sampling frequency which is generated by the timing generator.
Digital Camera Processor (IC300)
The B channel signal is stored in a line-memory in this processor where the
right end and the left end of B signal are inverted to the correct sequence. Then
the R. G. B. signals receive the white balance adjustment, gamma correction
and are mixed to the Y signal and the color difference signal.
Timing Generator (IC204)
The master frequency of 27 MHz is frequency divided-by-2 and is used as the
timing pulse of the camera system.
AE (Auto Exposure)
Amplitude of the video signal that is input to the digital camera processor (IC300)
is detected. The output signal of the amplitude detection is sent to the camera
controller (IC302) that controls the iris drive amplifier (IC501) so that the lens
iris is controlled in accordance with the signal amplitude.
ND Filter
The same detection circuit as the AE operation, is used for the ND control.
When an ND filter needs to be inserted in the optical path, the message “ND
ON” is displayed on the LED and LCD screens.
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