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. 475-6173
Mfr. Part No.REC16B25-201C
SGD28.70
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 182-5671
Mfr. Part No.JT30-120-C00
SGD143.74
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 182-5627
Mfr. Part No.RESW20D-50-201-1
SGD39.85
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
RS Stock No. 182-5685
Mfr. Part No.CJ25-42010
SGD86.832
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. 475-6145
Mfr. Part No.REC16A25-201
SGD31.22
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 182-5633
Mfr. Part No.REC16B50-201-C
SGD45.20
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5673
Mfr. Part No.JT22-320-C00
SGD95.16
Each
units
- Absolute - 12V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 182-5684
Mfr. Part No.CJ25-82010
SGD86.832
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. 182-5637
Mfr. Part No.REC16A50-201-C
SGD45.20
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5688
Mfr. Part No.REC16M25-201
SGD35.68
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5638
Mfr. Part No.REC16A50-201
SGD45.20
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5634
Mfr. Part No.REC16B50-201
SGD44.01
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5628
Mfr. Part No.RESW20D-25-201-1
SGD39.85
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
RS Stock No. 182-5630
Mfr. Part No.RECW20D-25-201-1
SGD44.61
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
RS Stock No. 182-5668
Mfr. Part No.JT30-340-C00
SGD143.74
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 182-5635
Mfr. Part No.REC16B25-201-C
SGD41.63
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5697
Mfr. Part No.REC16K25-201
SGD35.68
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 182-5690
Mfr. Part No.CJ25-82010
SGD92.78
Each
units
5 Incremental Digital Square Wave 5V dc 6.35 mm M17 9.35mm - Round Wire Lead - 20mA
RS Stock No. 182-5674
Mfr. Part No.JT22-320-500
SGD95.16
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 182-5676
Mfr. Part No.JT22-120-500
SGD95.16
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA