Optical Rotary Encoders

An optical rotary encoder is an angular position sensor. It converts an angular displacement directly into a digital form. There are usually three components in an optical rotary encoder: a light source (an LED), a sensor and a moveable disk.


How an optical rotary encoder works


Optical rotary encoders have a shaft mechanically coupled to an input driver. This driver rotates a disc fixed onto it which is marked with a succession of opaque and clear segments.

Light from infrared emitting diodes reaches the infrared receivers through the transparent slits of the rotating disc, creating an analogue signal. The signal is then amplified electronically and converted into digital form. This is then transmitted to the data processor. 


Uses for optical rotary encoders 


Optical rotary encoders make precise digital signals. This makes them a good option where image resolution matters, and explains their use in applications as varied as office equipment (in computer mice and photo copiers) and medical devices. 


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Description Price Pulses Per Revolution Encoder Reading Encoder Signal Supply Voltage Shaft Diameter Mounting Hole Diameter Shaft Length Mounting Type Shaft Style Termination Style Maximum Operating Speed Current Rating
RS Stock No. 878-0521
Mfr. Part No.25LB22-H
BrandGrayhill
TWD336.00
Each
units
- 2 bit Quadrature Hex Code - 6.35 mm - 19.05mm Panel Mount Flat - - 1.5 mA @ 115 V ac, 150 mA @ 14 V dc, 250 mA @ 28 V dc
RS Stock No. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
TWD632.00
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3142
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
TWD513.50
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
TWD631.00
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3141
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
TWD512.10
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
TWD930.30
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 878-0530
Mfr. Part No.25LB22-G
BrandGrayhill
TWD266.00
Each
units
- Absolute Gray Code - 6.35 mm - 19.05mm Panel Mount Flat - - 1.5 mA @ 115 V ac, 150 mA @ 14 V dc, 250 mA @ 28 V dc
RS Stock No. 878-0515
Mfr. Part No.62C1122-01-060C
BrandGrayhill
TWD2,687.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.98mm Panel Mount Flat Connector 100rpm 50 mA @ 5 V dc
RS Stock No. 878-0518
Mfr. Part No.62C2222-01-060C
BrandGrayhill
TWD2,805.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.98mm Panel Mount Flat Connector 100rpm 50 mA @ 5 V dc
RS Stock No. 789-9501
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
TWD2,282.00
Each
units
100 Incremental Digital Square Wave 5V dc 3.175 mm 0.99mm 22.23mm Bracket Mount Plain Axial PC Pin 3000rpm -
RS Stock No. 878-0612
Mfr. Part No.62A22-02-060S
BrandGrayhill
TWD1,518.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
RS Stock No. 878-0549
Mfr. Part No.61R128-075
BrandGrayhill
TWD3,151.00
Each
units
128 Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 18.4mm Surface Mount Flat Pin 300rpm 30 mA @ 5 V dc
RS Stock No. 878-0616
Mfr. Part No.61B22-01-02-060
BrandGrayhill
TWD3,269.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.4mm Panel Mount Flat Cable 16.6 rpm @ 30 mS 30 mA @ 5 V dc
RS Stock No. 202-0442
Mfr. Part No.RE30E-1000-213-1
TWD3,039.00
Each
units
1000 Incremental Digital Square Wave 5 - 12V dc 4 mm - - Panel Mount Plain Cable - -
RS Stock No. 878-0565
Mfr. Part No.61RS128-080
BrandGrayhill
TWD2,818.00
Each
units
128 Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 18.4mm Surface Mount Flat Pin 300rpm 30 mA @ 5 V dc
RS Stock No. 878-2753
Mfr. Part No.62AY22060
BrandGrayhill
TWD2,773.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - - Panel Mount Flat Cable 100rpm 30 mA @ 5 V dc
RS Stock No. 878-0543
Mfr. Part No.62A11-02-180S
BrandGrayhill
TWD1,616.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
RS Stock No. 878-0552
Mfr. Part No.62A15-02-020C
BrandGrayhill
TWD1,460.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 30mA
RS Stock No. 878-0495
Mfr. Part No.25LB15-Q
BrandGrayhill
TWD268.00
Each
units
- 2 bit Quadrature Quadrature Code - 6.35 mm - 19.05mm Panel Mount Flat - - 1.5 mA @ 115 V ac, 150 mA @ 14 V dc, 250 mA @ 28 V dc
RS Stock No. 202-4396
Mfr. Part No.REC16L25-205-B
TWD3,896.00
1 Box of 5
Box(es)
25 Incremental Digital Square Wave 5V dc 16 mm - - Through Hole Flat - - -