Toshiba DP120F Service Manual page 267

2.2.4 Scanning Area
It consists of the White plate and CIS unit to scan documents.
Feed direction
• White plate
The light of the LED array is shined upon the White plate to establish a reference between
black and white on the document pages. Based on that data, the standard value of white
is set. It also functions to press documents down against the CIS unit surface.
• CIS unit
The CIS (Contact Image Scanner) unit consists of the LED array, Lens array, and Sensor
array. The CIS functions to obtain image sections of respective scanning width of a docu-
ment. (As for resolution, etc., Refer to Page 2-2.) The light emitted by LEDs strikes the
surface of the document and reflects through the Lens array and is read by the Sensor
array.
March 2000 © TOSHIBA TEC
White plate
LED array
Sensor array
Fig. 5-2-4
5-7
Documents
Lens array
DP120F/DP125F Mechanical Description
05-02-04