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
SGD42.74
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 182-5638
Mfr. Part No.REC16A50-201
SGD25.91
Each
units
50 - 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
SGD29.50
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
RS Stock No. 475-6167
Mfr. Part No.REC16B25-201
SGD40.43
Each
units
25 - Digital Square Wave 5V dc 6 mm 9mm - Through Hole Flat - - -
RS Stock No. 182-5628
Mfr. Part No.RESW20D-25-201-1
SGD35.41
Each
units
25 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
New
RS Stock No. 202-4407
Mfr. Part No.RES20-50-200
SGD157.10
1 Box of 5
Box(es)
50 Incremental - 5V dc 20 mm - - Through Hole Slotted Pin - -
RS Stock No. 182-5674
Mfr. Part No.JT22-320-500
SGD140.01
Each
units
- Absolute - 5V dc 3 mm M9 8mm - Flat Wire Lead - 40mA
RS Stock No. 182-5629
Mfr. Part No.RECW20D-50-201-1
SGD30.88
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
RS Stock No. 182-5637
Mfr. Part No.REC16A50-201-C
SGD26.57
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 16.5mm Through Hole Flat Wire Lead - 30mA
New
RS Stock No. 202-4409
Mfr. Part No.RES20D-50-201-1
SGD121.77
1 Box of 5
Box(es)
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - - -
New
RS Stock No. 202-4397
Mfr. Part No.REC16L25-205-B
SGD38.88
Each
units
25 Incremental Digital Square Wave 5V dc 16 mm - - Through Hole Flat - - -
New
RS Stock No. 202-0447
Mfr. Part No.RE30E-400-213-1
SGD68.64
Each
units
400 Incremental Digital Square Wave 5 - 12V dc 4 mm - - Panel Mount Plain Cable - -
RS Stock No. 182-5668
Mfr. Part No.JT30-340-C00
SGD203.99
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
New
RS Stock No. 202-4406
Mfr. Part No.REC20D-50-201-1
SGD34.60
Each
units
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Flat - - -
New
RS Stock No. 202-4405
Mfr. Part No.REC20D-50-201-1
SGD133.90
1 Box of 5
Box(es)
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Flat - - -
RS Stock No. 182-5690
Mfr. Part No.CJ25-82010
SGD100.50
Each
units
5 Incremental Digital Square Wave 5V dc 6.35 mm M17 9.35mm - Round Wire Lead - 20mA
RS Stock No. 182-5671
Mfr. Part No.JT30-120-C00
SGD198.09
Each
units
- Absolute - 12V dc 6 mm - 15mm - Flat Wire Lead - 40mA
RS Stock No. 182-5627
Mfr. Part No.RESW20D-50-201-1
SGD35.16
Each
units
50 - Digital Square Wave 5V dc 6 mm M9 12mm - Round Wire Lead - 50mA
New
RS Stock No. 202-0446
Mfr. Part No.RE30E-360-213-1
SGD68.64
Each
units
360 Incremental Digital Square Wave 5 - 12V dc 4 mm - - Panel Mount Plain Cable - -
New
RS Stock No. 202-4410
Mfr. Part No.RES20D-50-201-1
SGD31.46
Each
units
50 Incremental Digital Square Wave 5V dc 20 mm - - Panel Mount Slotted - - -