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. 164-2633
Mfr. Part No.ENS1J-B28-L00256L
BrandBourns
PHP3,829.28
Each
units
256 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 167-3612
Mfr. Part No.ENS1J-B28-L00256L
BrandBourns
PHP2,456.254
Each (In a Tray of 42)
units
256 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 162-2507
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
PHP1,465.444
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. 789-9510
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
PHP3,533.25
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. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
PHP2,391.50
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 167-5492
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
PHP2,487.47
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. 263-2873
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
PHP1,903.17
Each
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 878-0625
Mfr. Part No.61K64
BrandGrayhill
PHP3,879.70
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. 796-7868
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
PHP1,817.85
Each
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
PHP792.34
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 878-0521
Mfr. Part No.25LB22-H
BrandGrayhill
PHP386.40
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. 878-0622
Mfr. Part No.61KS64-020
BrandGrayhill
PHP4,211.96
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. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
PHP793.80
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 878-0565
Mfr. Part No.61RS128-080
BrandGrayhill
PHP4,116.53
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. 178-3142
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
PHP794.85
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 878-0467
Mfr. Part No.62S22-M0-050C
BrandGrayhill
PHP2,217.79
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. 878-0527
Mfr. Part No.25LB10-Q
BrandGrayhill
PHP359.14
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. 178-3141
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
PHP725.106
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 182-5634
Mfr. Part No.REC16B50-201
PHP1,441.05
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5632
Mfr. Part No.REC16K25-201
PHP777.70
Each (In a Tray of 20)
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
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