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. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
MYR141.802
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 789-9504
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
MYR162.33
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. 878-0521
Mfr. Part No.25LB22-H
BrandGrayhill
MYR31.43
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. 796-7868
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
MYR160.40
Each
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 167-5490
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
MYR151.667
Each (In a Tray of 42)
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. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
MYR66.89
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 263-2873
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
MYR152.65
Each
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 878-0518
Mfr. Part No.62C2222-01-060C
BrandGrayhill
MYR337.46
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.98mm Panel Mount Flat Connector 100rpm 50 mA @ 5 V dc
RS Stock No. 878-0619
Mfr. Part No.62A22-02-060C
BrandGrayhill
MYR166.61
Each
units
- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 30mA
RS Stock No. 178-3141
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
MYR62.97
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 162-2507
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
MYR151.667
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. 878-0458
Mfr. Part No.62S22-M0-020C
BrandGrayhill
MYR196.55
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. 134-8198
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
MYR243.21
Each
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
New
RS Stock No. 202-4404
Mfr. Part No.REC20C-50-201-1
MYR216.43
Each
units
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - - -
RS Stock No. 182-5674
Mfr. Part No.JT22-320-500
MYR380.07
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
MYR66.26
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 167-5489
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
MYR211.86
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 -
New
RS Stock No. 202-4403
Mfr. Part No.REC20C-50-201-1
MYR923.65
1 Box of 5
Box(es)
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - - -
RS Stock No. 182-5637
Mfr. Part No.REC16A50-201-C
MYR100.91
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 878-0473
Mfr. Part No.62S11-M0-020C
BrandGrayhill
MYR197.10
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