Document Table Structure - Oki MC860 Maintenance Manual

Oki Data CONFIDENTIAL

2.3.2 Document table structure

2.3.2.1 Overview
The book scanner unit consist of the book scanner scanning glass (pain), the book scanner
optical scanning block (Carriage A ASSY, Carriage B ASSY, scanner frame ASSY and the
book scanner drive block.)
Detection of document size is executed when the BIS sensor is ON. Detection of the closed
status of the pressure plate (book cover) is executed by turning the APS sensor to ON. The
lamp (cold-cathode tube) is located on top of the carriage A. The light irradiated by the cold-
cathode tube enters the carriage A => carriage B => lens in this order and reaches the CCD
device. The optimal focal length is maintained by the scanning that maintains a specified
distance between the carriage A and the carriage B.
43967002TH Rev.1
2.3.2.2 Exposure block
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1. Reflect tape
The document such as book does not contact completely with the glass surface.
Therefore, the joining areas are copied in black. In order to reduce this adverse effect,
the light from the lamp is reflected by the reflect tape before it is irradiated to the
document.
2. Lamp
Cold-cathode tube is used to irradiate light to document.
3. Mirror A
The reflected light from document is again reflected to the mirror B.
2. Theory of Operation
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