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
$124.89
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
$83.449
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. 167-5492
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
$85.36
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 -
RS Stock No. 789-9510
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
$96.21
Each
units
100 Incremental Digital Square Wave 5V dc 7.14 mm 0.99mm 22.23mm Bracket Mount Plain Axial PC Pin 3000rpm -
RS Stock No. 263-2873
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
$86.59
Each
units
64 - Digital Square Wave 5V dc 6.35 mm - 22.23mm Bracket Mount Round - 3000rpm -
RS Stock No. 162-2507
Mfr. Part No.ENA1J-B28-L00064L
BrandBourns
$57.085
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. 167-5308
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
$38.742
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. 789-9488
Mfr. Part No.EM14A1D-C24-L032N
BrandBourns
$42.17
Each
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. 789-9497
Mfr. Part No.EM14R1D-R20-L032N
BrandBourns
$46.22
Each
units
32 Incremental 2 Channel Quadrature 5V dc 6 mm 1.73mm 20mm Through Hole Slotted Axial PC Pin 120rpm -
RS Stock No. 162-2596
Mfr. Part No.EM14A1D-C24-L032N
BrandBourns
$32.762
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. 263-2889
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
$86.59
Each
units
128 Incremental Digital Square Wave 5V dc 6.35 mm 9.5mm 22.23mm Bracket Mount Round - 3000rpm 26mA
RS Stock No. 789-9504
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
$89.27
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. 134-8142
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
$83.752
Each (In a Tube of 25)
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
RS Stock No. 789-9501
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
$104.31
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. 167-5489
Mfr. Part No.ENT1D-D28-L00100L
BrandBourns
$85.36
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 -
RS Stock No. 134-8197
Mfr. Part No.ES14A0D-E28-L032N
BrandBourns
$98.86
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 26mA
RS Stock No. 167-5490
Mfr. Part No.ENA1D-B28-L00128L
BrandBourns
$71.251
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. 134-8141
Mfr. Part No.ES14A0D-E28-L032N
BrandBourns
$85.928
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. 167-3613
Mfr. Part No.ENA1J-B28-L00128L
BrandBourns
$62.436
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. 134-8198
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
$98.86
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