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
HK$38.81
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. 263-2889
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
HK$402.44
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
HK$324.22
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. 878-0448
Mfr. Part No.62AG22-L0-P
BrandGrayhill
HK$215.62
Each
units
- Quadrature 2-Bit Gray Code 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Pin 100rpm 30mA
RS Stock No. 789-9497
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
HK$189.00
Each
units
32 Incremental 2 Channel Quadrature 5V dc 6 mm 1.73mm 20mm Through Hole Slotted Axial PC Pin 120rpm -
RS Stock No. 878-0537
Mfr. Part No.61R128
BrandGrayhill
HK$643.41
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. 167-5492
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
HK$443.25
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. 878-0530
Mfr. Part No.25LB22-G
BrandGrayhill
HK$51.99
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. 789-9510
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
HK$521.22
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. 167-5308
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
HK$201.18
Each (In a Tube of 25)
units
32 Incremental 2 Channel Quadrature 5V dc 6 mm 1.73mm 20mm Through Hole Slotted Axial PC Pin 120rpm -
RS Stock No. 878-0439
Mfr. Part No.62AG22-L0-060C
BrandGrayhill
HK$215.62
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. 878-0451
Mfr. Part No.61C11-01-08-01
BrandGrayhill
HK$231.38
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. 878-0583
Mfr. Part No.62N30-P
BrandGrayhill
HK$710.71
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.9mm Panel Mount Flat Pin 100rpm 30 mA @ 5 V dc
RS Stock No. 878-0587
Mfr. Part No.62R30-01-P
BrandGrayhill
HK$822.17
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.45mm Panel Mount Flat Pin 100rpm 30 mA @ 5 V dc
RS Stock No. 878-0619
Mfr. Part No.62A22-02-060C
BrandGrayhill
HK$397.73
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 30mA
RS Stock No. 878-0593
Mfr. Part No.62A11-02-040CH
BrandGrayhill
HK$411.70
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 30mA
RS Stock No. 878-0622
Mfr. Part No.61KS64-020
BrandGrayhill
HK$740.01
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. 878-0650
Mfr. Part No.60AD18-4-M-060C
BrandGrayhill
HK$703.98
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. 878-0596
Mfr. Part No.62S11-M5-100CH
BrandGrayhill
HK$450.23
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. 878-0669
Mfr. Part No.60AD18-8-M-060C
BrandGrayhill
HK$703.98
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)