GP1A30R Datasheet, PDF (4/4 Pages) Sharp Electrionic Components – OPIC Photointerrupter with Encoder Function

Fig.11 Duty Ratio vs. Distance (Z direction )
0.9
V _CC= 5V
0.8
I_F = 30mA
f= 2.5kHz
0.7
T_a = 25˚C
t _AH
t _AP
( Output A )
0.6
t _BH
t _BP
( Output B )
0.5
0.4
0.3
0.2
0.1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Distance Z ( mm ) ( Shifting encoder )
s Measurement Conditions
A
4-R1.3
3
GP1A30R
Disk center
φ 31.6, 0.1t
Disk _{120 slits}
S₂
(18.385 )
1.4
6.4
11.4
A
S₁
9.9
(11.685 )
s Precautions for Use
( 1) This module is designed to be operated
at I _F= 30mA TYP.
( 2) Fixing torque : MAX. 0.6Nm (6kgf • cm)
( 3) In order to stabilize power supply line,
connect a by-pass capacitor of more than 0.01µF
between Vcc and GND near the device.
( 4) As for other general cautions, refer to
the chapter “ Precautions for Use ” .
GP1A30R
Fig.12 Phase Difference vs.
Distance (Z direction )
130
V_CC = 5V
120 ^{IF = 30mA}
f= 2.5kHz
110 ^{Ta = 25˚C}
100
θ_AB1=
t _AB1
t _AP
x 360˚
90
80
( Detecting side )
70
Z
OPIC ^Disk
60
( Emitting side )
50
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Distance Z ( mm ) ( Shifting encoder )
<Basic Design>
RO ( distance between the disk center and half point of a slit ) ,
P ( slit pitch ) , S 1 and S2 ( installing position of photointer-
rupter ) will be provided by the following equations.
Slit pitch : P ( slit center )
R O=
N
120
x
13.45 ( mm )
N: number of slits
P= ^{2x p x RO} ( mm )
N
S1= RO- 1.765 (mm ), S2= S1+ 6.7(mm )
Note ) When the number of slits is changed, values in parenthesis
are also changed according to the number.
Enlarged drawing
of A portion
Slit pitch : P
P
r₁= r₂
( Ex.) In the case of
N= 200P/R
RO=
200
120
x 13.45 ( mm )
= 22.42mm
P= ^{2 x p x 22.42} ( mm )
200
= 0.704mm
S1= 22.42- 1.765
= 20.655mm
S2= 20.655+ 6.7
= 27.355mm
Disk center