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
RS Stock No. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
kr 239,695
Each (In a Box of 100)
Units
1000 Incremental - - 1/2 in - - Through Hole - - 30000rpm
RS Stock No. 878-0458
Mfr. Part No.62S22-M0-020C
BrandGrayhill
kr 671,53
Each
Units
- Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Connector -
RS Stock No. 789-9504
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
kr 619,45
Each
Units
128 Incremental Digital Square Wave 5V dc 6.342 mm 0.99mm 22.23mm Bracket Mount Plain Axial PC Pin 3000rpm
RS Stock No. 878-0583
Mfr. Part No.62N30-P
BrandGrayhill
kr 1 183,03
Each
Units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.9mm Panel Mount Flat Pin 100rpm
RS Stock No. 213-1688
Mfr. Part No.DMS22B5A1CAFL336N
BrandBourns
kr 640,33
Each
Units
12 bit - - 5V dc 22.225 mm - - - Flat - -
RS Stock No. 215-5737
Mfr. Part No.AEDR-8723-102
BrandBroadcom
kr 396,70
Each
Units
- Incremental - - - - - Surface Mount - - -
RS Stock No. 202-4409
Mfr. Part No.RES20D-50-201-1
kr 840,47
1 Box of 5
Box(es)
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - -
RS Stock No. 878-0619
Mfr. Part No.62A22-02-060C
BrandGrayhill
kr 397,02
Each
Units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm
New
RS Stock No. 239-4184
Mfr. Part No.PER601-P117-N0015
BrandBourns
kr 44,003
Each (In a Box of 220)
Units
15 Incremental 2-Bit Quadrature 5V dc - - - - - - -
RS Stock No. 182-5697
Mfr. Part No.REC16K25-201
kr 211,45
Each
Units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead -
RS Stock No. 878-0521
Mfr. Part No.25LB22-H
BrandGrayhill
kr 169,27
Each
Units
- 2 bit Quadrature Hex Code - 6.35 mm - 19.05mm Panel Mount Flat - -
RS Stock No. 878-0470
Mfr. Part No.62S11-M5-020C
BrandGrayhill
kr 649,02
Each
Units
- Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Connector -
RS Stock No. 202-0446
Mfr. Part No.RE30E-360-213-1
kr 454,86
Each
Units
360 Incremental Digital Square Wave 5 - 12V dc 4 mm - - Panel Mount Plain Cable -
RS Stock No. 202-4404
Mfr. Part No.REC20C-50-201-1
kr 487,15
Each
Units
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - -
RS Stock No. 263-2889
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
kr 567,38
Each
Units
128 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm
RS Stock No. 202-4410
Mfr. Part No.RES20D-50-201-1
kr 217,21
Each
Units
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - -
RS Stock No. 878-0420
Mfr. Part No.62AG22-L5-060C
BrandGrayhill
kr 216,56
Each
Units
- Quadrature 2-Bit Gray Code 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Connector 100rpm
RS Stock No. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
kr 257,11
Each
Units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm
RS Stock No. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
kr 252,76
Each
Units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm
RS Stock No. 134-8197
Mfr. Part No.ES14A0D-E28-L032N
BrandBourns
kr 709,79
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