Encoder
20mm Size Metal Shaft Magnetic Type
EM20B
Series
Dimensions
No.
With push-on switch
（travel
0.5mm）
Style
Unit:mm
PC board mounting hole dimensions
（Viewed
from mounting side）
Detector
Push
ho
le s
ø21.5
20
C0.5
ø9
16
5.5
13
3.9 Snap-in
Slide
Rotary
7
11.1
5
2.6
1
2 -ø
9.5
11.5
1.5
2
2.4
ø4
3
7.5
0.5
Switch
travel
S
1
S
2
1 0 .2
1
3.5
1.8
B
6-ø0.6 holes
AG
A
V
A
2.5 4
Encoders
Power
Dual-in-line
Package Type
TACT Switch
TM
Custom-
Products
Switch terminal
3.3
G
B
V
B
29.25˚
VA, VB
MMM
Power supply
GA, GB
MMM
Ground
A, B
MMMMMMMM
Out put
With LED
With push-on switch
（travel
0.5mm）
29.25
9˚
126
Switch travel
C0.5 0.5
19
3.5
1
2.54
6-
ø6
ho
le s
R
（
）
10
ø23
ø20
L1 L31
2.6
ø18.6
LED
3.6
Lamp house Top : Black
Side : White
10
11.11
7
9.94
9.47
8.55
7.22
3
31
-0
.8
20
ø4
3
7.5
2. 8
1
5
6.43
10.38
11.1
13.83
16.63
2-ø1
+0.1
0
LED Unit Recommended Drive Circuit Block Diagram
2 to 4 decoder
A
B
Common
select signal
5
Driver
6
7
8
4
2
1
3 10 12 11
9
Switch terminal
3.3
Driver
8 bit latch driver shift register
DATA (display data)
LATCH (display data latch signal)
CLK (data transfer clock)
（
12
.5
˚
）
12-ø0.8 holes
7
3
ø1
.75˚
）
（
33
3.9
Snap- in
1.8
12
Incremental
Type
Absolute
Type
10.2
201
ALPS [ ALPS ELECTRIC CO.,LTD. ]
