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This procedure occurs several times during each signal line of scanning.
Sample
Sample hold
signal (SH)
signal (SH)
Intensity selec-
Intensity selection
tion signal 0
signal 0 (SW0)
Intensity selec-
Intensity selection
tion signal 1
signal 1 (SW2)
Intensity selec-
Intensity selection
tion signal 2
signal 2 (SW2)
Bias control On
Image
Bias control ON
signal (APCON*)
processor
signal (AP CON*)
Image
PBA
processor
PCB
Laser drive
Laser drive
signal (LSRD)
signal(LSRD)
laser output characteristics
Laser output characteristics
at temperature T1
at temperature T1
Photo-output
Photo output
Ib(T1)
I
(T
)
b
1
Ib(T2)
I
(T
)
b
2
The laser bias current
ed.1
Setting cir-
cuit for the
Laser intensity
laser inten-
setting circuit
sity
VR1202 VR1205
VR1206
Limiting
Limiter
circuit
circuit
VR1204
Laser output characteristics
Laser output characteristics
at temperature T2
at temperature T2
current
current
Ib(T1): Bias current for temperature T1
I
(T
) : Bias current for temperature T1
b
1
Ib(T2): Bias current for temperature T2
I
(T
) : Bias current for temperature T2
b
2
Drive current
Drive current
Laser driver PBA
Laser driver PCB
Laser element
Laser element
Bias control
Bias control
circuit
circuit
VR1203
Constant cur-
Constant current
rent circuit
VR1201
: Do not touch!
: Do not touch in the field.
Laser output
Laser output
04 Exposure 513
5V
5V
Current
Current
switch
switch
circuit
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