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e-STUDIO3511/4511 IMAGE PROCESSING 7 - 10 November 2003 © TOSHIBA TEC
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7.4 LGC Board (PWA-F-LGC-350)
7.4.1 Features
(1) The image processing ASIC on the LGC board is controlled by CPU mounted on the LGC board.
(2) The image processing functions of the LGC board realizes the followings:
• Smoothing processing
• Image area control
• Laser related control
7.4.2 Functions of image processing circuit
An image processing ASIC mounted on the LGC board enables the following functions:
(1) Smoothing processing
This function removes jaggy and smoothes character outline of images and output them.
(2) Image area control
This function sets the effective image area in horizontal and vertical directions to be output.
(3) Laser related control
This function performs the APC (Auto Power Control).
7.5 Laser Driving PC Board (LDR Board)
Image signals processed on the LGC board are processed by ASIC for writing control and LDR board.
The signal is then laser controlled and written on the drum.
(1) Setting of effective image area ......................... • Top, bottom, left and right margins
(2) Horizontal synchronization signal (HSYNC)..... • Reference clock signal in the printer section
clock generation section synchronized with HSYNC and its signal.
(3) Laser drive section ........................................... • ON/OFF control of the semiconductive laser and
APC (Auto Power Control).