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
€6.11
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. 878-0426
Mfr. Part No.62AG11-L0-060C
BrandGrayhill
€18.27
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. 878-2750
Mfr. Part No.62S15-M5-250SH
BrandGrayhill
€61.20
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. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
€23.883
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 878-0423
Mfr. Part No.62AG11-L5-060C
BrandGrayhill
€18.53
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. 162-2507
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
€31.16
Each (In a Tray of 42)
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 878-0622
Mfr. Part No.61KS64-020
BrandGrayhill
€102.54
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. 167-5308
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
€21.599
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. 789-9497
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
€27.00
Each
units
32 Incremental 2 Channel Quadrature 5V dc 6 mm 1.73mm 20mm Through Hole Slotted Axial PC Pin 120rpm -
RS Stock No. 263-2873
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
€44.87
Each
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 878-0559
Mfr. Part No.60A00-4-020C
BrandGrayhill
€62.98
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 14.73mm Panel Mount Flat Connector - 20 mA @ 5 V dc (Rotary), 5 (Joystick) mA
RS Stock No. 202-0443
Mfr. Part No.RE30E-1024-213-1
€55.53
Each
units
1024 Incremental Digital Square Wave 5 - 12V dc 4 mm - - Panel Mount Plain Cable - -
RS Stock No. 202-4397
Mfr. Part No.REC16L25-205-B
€22.65
Each
units
25 Incremental Digital Square Wave 5V dc 16 mm - - Through Hole Flat - - -
RS Stock No. 878-0458
Mfr. Part No.62S22-M0-020C
BrandGrayhill
€55.27
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. 878-0577
Mfr. Part No.62A11-02-P
BrandGrayhill
€27.00
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.32 mm - 17.42mm - Flat Pin 100rpm 30mA
RS Stock No. 182-5633
Mfr. Part No.REC16B50-201-C
€14.08
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 878-0533
Mfr. Part No.62A22-02-100S
BrandGrayhill
€60.88
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Stripped Cable 100rpm 30mA
RS Stock No. 878-0448
Mfr. Part No.62AG22-L0-P
BrandGrayhill
€20.42
Each
units
- Quadrature 2-Bit Gray Code 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Pin 100rpm 30mA
RS Stock No. 878-0436
Mfr. Part No.62AG11-L0-P
BrandGrayhill
€20.43
Each
units
- Quadrature 2-Bit Gray Code 5V dc 6.32 mm - 17.45mm Panel Mount Flat Center Pin 100rpm 30mA
RS Stock No. 878-0470
Mfr. Part No.62S11-M5-020C
BrandGrayhill
€53.90
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