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. 182-5630
Mfr. Part No.RECW20D-25-201-1
PHP1,092.28
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25 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
RS Stock No. 878-0552
Mfr. Part No.62A15-02-020C
BrandGrayhill
PHP2,305.33
Each
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- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.44mm Surface Mount Flat Connector 100rpm 30mA
RS Stock No. 878-0580
Mfr. Part No.62N22-P
BrandGrayhill
PHP4,292.99
Each
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- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 26.9mm Panel Mount Flat Pin 100rpm 30 mA @ 5 V dc
RS Stock No. 475-6151
Mfr. Part No.REC16A25-201C
PHP1,128.81
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25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 878-0616
Mfr. Part No.61B22-01-02-060
BrandGrayhill
PHP3,804.21
Each
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- Quadrature 2-Bit Quadrature 5V dc 6.35 mm - 17.4mm Panel Mount Flat Cable 16.6 rpm @ 30 mS 30 mA @ 5 V dc
RS Stock No. 182-5629
Mfr. Part No.RECW20D-50-201-1
PHP1,460.53
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA