FujiFilm ClearView CS, Service Manual

Page: 119 / 1404

CR-IR 363 Service Manual
MD-50
MD-50
011-202-11E
06.29.2012 FM6046
4.1.4 Image Data Flow
The flow of image data is described below.
Numerals (1), (2), and so forth at the beginning of the items correspond to (1), (2),
and so forth in the image data flow illustration.
It should be noted that the image data is sent to the CL nearly concurrently with
reading.
(1) When the laser light from the scanning optics unit hits the IP, it
becomes luminescence data, which is read by the photomultiplier
through the light-collecting guide. For the both-side type IP, the data
is read simultaneously from both the front side and back side.
(2) The resulting data is sent, in the form of analog data, from the PMTxxx
board (front-side photomultiplier) to the scanner board (SCTxxx).
For the both-side type IP, the data is also sent simultaneously, in the form of analog
data, from the PMRxxx (back-side photomultiplier) to the scanner board (SCTxxx).
(3) The analog data is subjected to shading correction and other
processing on the scanner board (SCTxxx), before it is converted to
digital data (analog-to-digital conversion). For the both-side type IP,
the analog data for the back side is also subject to shading processing
and analog-to-digital conversion independently and concurrently.
(4) The digital data, after analog-to-digital conversion, is sent, in the
form of digital data, from the scanner board (SCTxxx) to the image
processing board (IMG17B).
(5) For processing of the both-side type IP, the digital data for the front
side and back side is subject to addition by the image processing
board (IMG17B).
(6) The resulting data is subjected to image processing by the sub
CPU located on the image processing board (IMG17B), and then
temporarily stored, on a FIFO basis, into the SDRAM located on the
CPU board (CPU91A).
(7) The image data stored in the SDRAM is sent to the CL via the network
under control of the main CPU located on the CPU board (CPU91A).
Light-collection
guide (backside)
FR9H1093.ai
Laser light and luminescence data
IP
Light-collecting
mirror
Laser light
[Photomultiplier]
PMTxxx
CPU91A
IMG17B
LOG amp
FIFO
SDRAM Main CPU
HV
Digital data
Analog data
PMRxxx
LOG amp
HV
Scanning optics unit
Printer
CL
Light-collection
guide (frontside)
SCTxxx
(5) Both-side addition
(3) Shading
correction
A/D conversion
Sub CPU
(1) Luminescence
data reading
(2) Transfer in analog
form
(4) Transfer in digital
form
(6) Image
processing
(7) Transfer to CL