| 摘要 |
PURPOSE: To prevent the generation of the trouble caused by noise by suppressing the radiation noise caused by a transfer clock. CONSTITUTION: An image data generating part reads image data continued in a main scanning direction from bit map data to collect the same by eight pixels and parallelly transfers the data in synchronous relation to transmission clock TCLK. In the timing control part 30a of an image writing part, a PUS converter 31 loads image data to convert the same to serial data in synchronous relation to the conversion clock CCLK outputted from a timing signal generating part 32 and a data register 33 registers the serial image data in synchronous relation to the clock CCLK to complete the registration of data corresponding to 128 pixels by 16-time parallel transmission. The registered image data is latched by a data latch part 34 and 128 LEDs are subjected to ON/OFF control to write an image. If the image is subjected to parallel transmission, the frequency of the transmission clock TCLK is reduced and radiation noise is suppressed to a large extent. |
