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. 475-6151
Mfr. Part No.REC16A25-201C
HK$287.83
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 182-5697
Mfr. Part No.REC16K25-201
HK$190.58
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 878-0546
Mfr. Part No.61R128-050
BrandGrayhill
HK$986.34
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. 134-8142
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
HK$442.108
Each (In a Tube of 25)
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. 878-0669
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)
RS Stock No. 134-8197
Mfr. Part No.ES14A0D-E28-L032N
BrandBourns
HK$542.48
Each
units
32 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. 182-5676
Mfr. Part No.JT22-120-500
HK$578.52
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 878-0426
Mfr. Part No.62AG11-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. 878-0561
Mfr. Part No.60A18-4-020C
BrandGrayhill
HK$647.64
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. 878-0583
Mfr. Part No.62N30-P
BrandGrayhill
HK$993.64
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. 182-5693
Mfr. Part No.CJ25-42010
HK$495.51
Each
units
5 Incremental Digital Square Wave 5V dc 6.35 mm M17 9.35mm - Round Wire Lead - 20mA
RS Stock No. 182-5639
Mfr. Part No.REC16A25-201-C
HK$241.40
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 878-0559
Mfr. Part No.60A00-4-020C
BrandGrayhill
HK$637.49
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. 878-0606
Mfr. Part No.62A11-02-060S
BrandGrayhill
HK$600.68
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
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. 878-0533
Mfr. Part No.62A22-02-100S
BrandGrayhill
HK$615.94
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
RS Stock No. 878-0625
Mfr. Part No.61K64
BrandGrayhill
HK$904.17
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. 182-5671
Mfr. Part No.JT30-120-C00
HK$887.29
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 878-0454
Mfr. Part No.26GSD45-01-1-AJS
BrandGrayhill
HK$378.04
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. 182-5637
Mfr. Part No.REC16A50-201-C
HK$241.40
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA