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[11] OPTICAL SECTION
1. General
The SF-2050 is composed of the fixed focus lens and six mirrors. The
lens and the mirrors are moved by the stepping motor to positions
according to the magnification ratio of reduction, normal, or enlarge-
ment copy. magnification ratio is changed from 0.5 to 2.0 in 151 steps
by 1%. The six mirrors realizes a compact design. The slit exposure
system with the moving light source is employed. Copy image density
can be controlled by changing light quantity of the copy lamp.
2. Basic composition
1
Copy lamp
4
No. 2 mirror
7
No. 4 mirror
F
Mirror base C unit
I
Lens drive motor
L
Mirror base C home position sensor
O
Automatic exposure sensor
(1) Original table
The original table is fixed, and an original is set to the left center.
18
4
3
5
10
17
15
2
Reflector
5
No. 3 mirror
8
No. 5 mirror
G
Copy lamp unit
J
No. 4, No. 5 mirror base drive motor
M
Lens home position sensor
P
OC switch
The automatic exposure sensor is provided to sense density of the
original and the copy lamp light quantity is controlled by the main
circuit to provide even copy image.
11
2
1
20
19
14
19
6
9
21
(2) Copy lamp
100V system 85V 250W
200V system 170V 275W
(3) Mirror
Six mirrors are used.
No. 1 mirror is attached to the copy lamp unit, No. 2 and No. 3
mirrors to mirror base B, No. 4 and No. 5 mirrors to mirror base C.
Mirror bases A and B are scanned when copying. Mirror base C is
used to change the distance between an original and the photocon-
ductor in reduction or enlargement copy.
(4) Lens (Fixed focus lens)
•
Construction: 1 group 4 lenses
•
Brightness: F6.3
•
Focal distance: 196mm
(5) Lens home position sensor (LHP)
This sensor is used to sense lens position. The output signal of
this sensor serves as the basic signal to control the copy magnifica-
tion ratio.
11 – 1
7
12
8
13
16
3
No. 1 mirror
6
Lens
9
No. 6 mirror
H
Mirror base C unit
K
Mirror motor
Mirror base A and B home position
N
sensors
Q
Light quantity correction plate
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