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. 263-2873
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
SGD80.02
Each
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 162-2507
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
SGD58.884
Each (In a Tray of 42)
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 475-6173
Mfr. Part No.REC16B25-201C
SGD29.63
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
SGD42.002
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 263-2889
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
SGD80.02
Each
units
128 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 167-3613
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
SGD58.884
Each (In a Tray of 42)
units
128 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 878-0521
Mfr. Part No.25LB22-H
BrandGrayhill
SGD15.38
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. 789-9501
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
SGD104.58
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. 878-0537
Mfr. Part No.61R128
BrandGrayhill
SGD117.98
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. 167-5489
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
SGD80.493
Each (In a Tray of 42)
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. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
SGD28.97
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3142
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
SGD23.531
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
SGD28.91
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 878-0505
Mfr. Part No.62C1111-01-060C
BrandGrayhill
SGD127.88
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. 878-0530
Mfr. Part No.25LB22-G
BrandGrayhill
SGD12.18
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. 878-0426
Mfr. Part No.62AG11-L0-060C
BrandGrayhill
SGD29.27
Each
units
- Quadrature 2-Bit Gray Code 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Connector 100rpm 30mA
RS Stock No. 878-0622
Mfr. Part No.61KS64-020
BrandGrayhill
SGD142.98
Each
units
64 Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 18.4mm Surface Mount Flat Pin 300rpm 30 mA @ 5 V dc
RS Stock No. 178-3141
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
SGD23.468
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 878-0420
Mfr. Part No.62AG22-L5-060C
BrandGrayhill
SGD28.76
Each
units
- Quadrature 2-Bit Gray Code 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Connector 100rpm 30mA
RS Stock No. 878-0549
Mfr. Part No.61R128-075
BrandGrayhill
SGD144.91
Each
units
128 Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 18.4mm Surface Mount Flat Pin 300rpm 30 mA @ 5 V dc