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. 164-2633
Mfr. Part No.ENS1J-B28-L00256L
BrandBourns
$113.54
Each
units
256 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 167-3612
Mfr. Part No.ENS1J-B28-L00256L
BrandBourns
$78.20
Each (In a Tray of 42)
units
256 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 796-7830
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
$28.44
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3141
Mfr. Part No.HEDS-5120#A11
BrandBroadcom
$23.976
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 475-6173
Mfr. Part No.REC16B25-201C
$47.18
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 178-3264
Mfr. Part No.HEDS-6140#B09
BrandBroadcom
$48.22
Each (In a Box of 100)
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 878-0521
Mfr. Part No.25LB22-H
BrandGrayhill
$11.25
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
$59.24
Each
units
1000 Incremental - - 0.5 in - - Through Hole - - 30000rpm -
RS Stock No. 789-9497
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
$44.72
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
$35.94
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. 796-7834
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
$28.50
Each
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 178-3142
Mfr. Part No.HEDS-5140#A11
BrandBroadcom
$23.15
Each (In a Tray of 50)
units
500 Incremental - - 4 mm - - Through Hole - - 30000rpm -
RS Stock No. 878-0482
Mfr. Part No.26GSD22-01-1-AJS
BrandGrayhill
$53.37
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. 475-6167
Mfr. Part No.REC16B25-201
$43.14
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 263-2889
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
$78.72
Each
units
128 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 167-5490
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
$66.14
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. 789-9504
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
$81.15
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. 167-3613
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
$57.93
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. 878-0470
Mfr. Part No.62S11-M5-020C
BrandGrayhill
$99.71
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. 162-2507
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
$57.93
Each (In a Tray of 42)
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm 26mA
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