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
TWD244.00
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. 178-3142
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
TWD513.20
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
TWD619.00
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3141
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
TWD501.60
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
TWD618.00
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
TWD1,163.00
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 796-7868
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
TWD1,265.00
Each
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 878-0530
Mfr. Part No.25LB22-G
BrandGrayhill
TWD245.00
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. 878-2750
Mfr. Part No.62S15-M5-250SH
BrandGrayhill
TWD2,478.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Ribbon Cable with Stripped End - 25 mA @ 5.25 V dc
RS Stock No. 878-2753
Mfr. Part No.62AY22060
BrandGrayhill
TWD3,074.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - - Panel Mount Flat Cable 100rpm 30 mA @ 5 V dc
RS Stock No. 789-9504
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
TWD1,763.00
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. 789-9501
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
TWD2,236.00
Each
units
100 Incremental Digital Square Wave 5V dc 3.175 mm 0.99mm 22.23mm Bracket Mount Plain Axial PC Pin 3000rpm -
RS Stock No. 162-2596
Mfr. Part No.EM14A1D-C24-L032N
BrandBourns
TWD781.00
Each (In a Tube of 25)
units
32 Incremental 2 Channel Quadrature 5V dc 3.17 mm 1.73mm 19.05mm Through Hole Flat Axial PC Pin 120rpm -
RS Stock No. 878-0423
Mfr. Part No.62AG11-L5-060C
BrandGrayhill
TWD676.00
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. 878-0533
Mfr. Part No.62A22-02-100S
BrandGrayhill
TWD2,440.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
RS Stock No. 878-0622
Mfr. Part No.61KS64-020
BrandGrayhill
TWD3,469.00
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. 134-8141
Mfr. Part No.ES14A0D-E28-L032N
BrandBourns
TWD1,750.90
Each (In a Tube of 25)
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. 878-0559
Mfr. Part No.60A00-4-020C
BrandGrayhill
TWD2,525.00
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. 182-5671
Mfr. Part No.JT30-120-C00
TWD4,177.00
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 878-0505
Mfr. Part No.62C1111-01-060C
BrandGrayhill
TWD3,901.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.98mm Panel Mount Flat Connector 100rpm 50 mA @ 5 V dc