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
TWD219
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
TWD590
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
TWD537
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 796-7868
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
TWD1,265
Each
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 878-0530
Mfr. Part No.25LB22-G
BrandGrayhill
TWD200
Each
units
- 2 bit Quadrature 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. 164-2633
Mfr. Part No.ENS1J-B28-L00256L
BrandBourns
TWD3,262
Each
units
256 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 878-0451
Mfr. Part No.61C11-01-08-01
BrandGrayhill
TWD938
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.45mm Panel Mount Flat PC Pin 16.6 rpm @ 30 mS 30 mA @ 5 V dc
RS Stock No. 475-6145
Mfr. Part No.REC16A25-201
TWD872
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 878-0599
Mfr. Part No.62V11-01-060C
BrandGrayhill
TWD1,588
Each
units
- Quadrature 2-Bit Quadrature 3.3V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 50mA
RS Stock No. 789-9501
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
TWD2,128
Each
units
100 Incremental Digital Square Wave 5V dc 7.14 mm 0.99mm 22.23mm Bracket Mount Plain Axial PC Pin 3000rpm -
RS Stock No. 475-6151
Mfr. Part No.REC16A25-201C
TWD1,120
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 878-0600
Mfr. Part No.62A15-02-060S
BrandGrayhill
TWD1,733
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
RS Stock No. 878-0454
Mfr. Part No.26GSD45-01-1-AJS
BrandGrayhill
TWD1,064
Each
units
- Quadrature BCD Output, Gray Code, Hexadecimal Code, Octal Code, Quadrature Code, 4 Bit Binary - 3.18 mm - 15.88mm Panel Mount Flat - - -
RS Stock No. 878-0669
Mfr. Part No.60AD18-8-M-060C
BrandGrayhill
TWD3,118
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 14.78mm Panel Mount Flat Connector 100rpm 5 (Joystick) mA, 20 mA @ 5 V dc (Rotary)
RS Stock No. 878-0559
Mfr. Part No.60A00-4-020C
BrandGrayhill
TWD2,146
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 14.73mm Panel Mount Flat Connector - 5 (Joystick) mA, 20 mA @ 5 V dc (Rotary)
RS Stock No. 134-8198
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
TWD2,372
Each
units
64 Quadrature 2-Bit Quadrature 5V dc 3.18 mm 1.73 mm, 14 mm 22.23mm Bracket Mount Slotted Axial PC Pin 1000rpm 26mA
RS Stock No. 878-2750
Mfr. Part No.62S15-M5-250SH
BrandGrayhill
TWD1,896
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Stripped End - 25 mA @ 5.25 V dc
RS Stock No. 878-0631
Mfr. Part No.60AR18-4-060C
BrandGrayhill
TWD5,122
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm 17.25mm 21.67mm Surface Mount Flat Connector 100rpm 5 (Joystick) mA, 20 mA @ 5 V dc (Rotary)
RS Stock No. 878-0458
Mfr. Part No.62S22-M0-020C
BrandGrayhill
TWD1,623
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Connector - 25 mA @ 5.25 V dc
RS Stock No. 789-9510
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
TWD2,039
Each
units
100 Incremental Digital Square Wave 5V dc 7.14 mm 0.99mm 22.23mm Bracket Mount Plain Axial PC Pin 3000rpm -