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. 182-5671
Mfr. Part No.JT30-120-C00
$142.11
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 182-5688
Mfr. Part No.REC16M25-201
$35.53
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 475-6151
Mfr. Part No.REC16A25-201C
$29.26
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 789-9510
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
$83.30
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. 134-8141
Mfr. Part No.ES14A0D-E28-L032N
BrandBourns
$71.606
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. 182-5674
Mfr. Part No.JT22-320-500
$94.74
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 182-5633
Mfr. Part No.REC16B50-201-C
$45.00
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5684
Mfr. Part No.CJ25-82010
$86.448
Each (In a Tray of 20)
units
5 Incremental Digital Square Wave 5V dc 6.35 mm M17 9.35mm - Round Wire Lead - 20mA
RS Stock No. 182-5631
Mfr. Part No.REC16M25-201
$28.421
Each (In a Tray of 20)
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5639
Mfr. Part No.REC16A25-201-C
$45.00
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 134-8198
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
$85.59
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
RS Stock No. 182-5672
Mfr. Part No.JT30-120-500
$142.11
Each
units
- Absolute - 5V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 182-5629
Mfr. Part No.RECW20D-50-201-1
$44.41
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
RS Stock No. 134-8142
Mfr. Part No.ES14A0D-E28-L064N
BrandBourns
$75.375
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. 182-5690
Mfr. Part No.CJ25-82010
$92.37
Each
units
5 Incremental Digital Square Wave 5V dc 6.35 mm M17 9.35mm - Round Wire Lead - 20mA
RS Stock No. 167-5492
Mfr. Part No.ENT1J-D28-L00100L
BrandBourns
$131.548
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. 182-5637
Mfr. Part No.REC16A50-201-C
$45.00
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5676
Mfr. Part No.JT22-120-500
$94.74
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 182-5675
Mfr. Part No.JT22-120-C00
$94.74
Each
units
- Absolute - 12V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
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