Toshiba 4560 Service Manual page 64

7.2 Construction
The construction and purpose of the optical section are the following:
(1) Original glass
The original is placed on this glass. Light from the exposure lamp exposes the surface of the origi-
nal through this original glass.
(2) Carriage 1
Carriage 1 consists of the exposure lamp, reflector, mirror 1, thermofuse, and light distribution
adjustment plates, etc. Carriage 1 is scanned by the scanning motor. The relation between the
scanning speed and the drum rotation speed is specified as follows. In actual-size copying, both
speeds are the same. The reproduction ratio of the direction of paper transport (lengthwise repro-
duction ratio) is specified by this scanning speed being changed. In enlargement copying, the scan-
ning speed is slower than the drum rotation speed, and in reduction copying it is faster.
a. Exposure lamp
The light source for exposing the original to light.
b. Reflector
The reflection plate for using the exposure lamp effectively.
The sub-reflector is slit for optical path width cutting.
4560/4570 OPTICAL
Light distribution plates
Reflector
Mirror 1
Sub-reflector
Mirror 1
7 - 2
Thermofuse
Exposure lamp
Original
Glass
Reflector
Exposure lamp
Nov. 1997 © TOSHIBA