xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
CCD Imager
CCD Output
H1, H2, PG
V1-V4
-7.5V 15V
CCD Output - Color Bars (light box)
Name Location Voltage
V Out Imager IC201/pin 8 1.4Vp-p
Time Base = 5 msec/div
Camera Signal Processing
Camera Modes of Operation:
All three operating modes use the LCD and Floppy Drive but not the cam-
era and audio sections.
Operating Sections
Mode Camera Speaker Mic
Play X
Still X
Movie X X
V Out
Camera Operation
When the Still or Movie modes are selected, the Iris motor in the lens
assembly is driven open, allowing light to fall upon the CCD imager. This
imager is an IC containing thousands of phototransistors. Each
phototransistor converts its portion of received light into electricity.
Each phototransistor is covered with one of three transparent colored
films. The colored film permits each voltage output to be in one of three
groups. Later in the FC-72 board, the three groups of voltages are matrixed
to produce a color picture.
The output of the CCD imager consists of the voltages from each
phototransistor. The CCD imager requires vertical, horizontal and gate
input pulses to output each voltage. All of these pulses come from the
timing generator on the FC-72 board. The horizontal (H1, H2) and gate
pulses (RG) are required to step each row of voltages out of the CCD
imager (CCD Out). After the row has exited, the remaining rows of volt-
ages are shifted down to the exit row using four sets of vertical pulses
(V1-V4).
In the Play Mode, all DC voltages and signals to the CCD imager go to 0V.
(no camera operation).
CCD Output
When each phototransistor voltage is output in series at high speed, the
voltages form a shape that corresponds to the brightness of the picture.
This CCD Output signal was taken of color bars from a light box. The
digitally captured waveform does not show the detail of the colors as your
scope would. The two gaps in the waveform corresponds to the vertical
interval at the top or bottom of the picture.
To Next Page
Loading...
Need help?
General
