Laser Exposure; Overview - Ricoh A193 Service Manual

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LASER EXPOSURE

3. LASER EXPOSURE

This machine uses a laser diode to produce electrostatic images on an OPC

drum. The laser diode unit converts image data from the BICU board into

laser pulses, and the optical components direct these pulses to the drum

To produce a high quality copy image, these are 64 gradations for the laser

pulses, controlled through power modulation and pulse width modulation.

Exposure of the drum surface by the pulsing laser beam creates the latent

image. The laser beam create the main scan while the drum rotation controls

the sub scan.

The strength of the beam is 0.6 mW on the drum surface at a wavelength of

There are four polygon motor speeds:

Resolution (dpi)

Copy and Printer

Fax (Image rotation)

Fax (mm printing)

Motor Speed (rpm) Data Frequency (MHz)

Rev. 2/28/97

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