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. 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. 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. 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. 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. 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. 878-0448
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. 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. 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. 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. 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. 878-0537
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. 878-0454
Mfr. Part No.26GSD45-01-1-AJS
BrandGrayhill
HK$262.49
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. 878-0442
Mfr. Part No.62A15-01-090C
BrandGrayhill
HK$341.55
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 30mA
RS Stock No. 878-0599
Mfr. Part No.62V11-01-060C
BrandGrayhill
HK$371.89
Each
units
- Quadrature 2-Bit Quadrature 3.3V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 50mA
RS Stock No. 167-5489
Mfr. Part No.ENT1D-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. 182-5685
Mfr. Part No.CJ25-42010
HK$463.742
Each (In a Tray of 20)
units
5 Incremental Digital Square Wave 5V dc 6.35 mm M17 9.35mm - Round Wire Lead - 20mA
RS Stock No. 182-5635
Mfr. Part No.REC16B25-201-C
HK$222.34
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 878-0458
Mfr. Part No.62S22-M0-020C
BrandGrayhill
HK$381.87
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. 182-5627
Mfr. Part No.RESW20D-50-201-1
HK$212.81
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
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