For the most productive optical rotary encoder search, we recommend making your selections in the following order: Line Count, Commutation, Bore Size.

For custom line count/commutation/bore sizes please contact us and a sales engineer will help customize an optical encoder for your application.

Please refer to the bottom of this page for an explanation of What is an Optical Rotary Encoder.

QM35 EZ-Comm Optical Rotary Encoder

QM35 EZ-Comm Optical Rotary Encoder

Programmable Comm. Alignment
Incremental & Commutation
Full Complement Outputs
Bearingless Modular Design
Low Profile: Ø1.44" x 0.43" H
Standard JAE Connector

QML35 EZ-Comm Optical Rotary Encoder

QML35 EZ-Comm Optical Rotary Encoder

Programmable Comm. Alignment
Incremental & Commutation
Single Ended Outputs
Bearingless Modular Design
Low Profile: Ø1.44" x 0.43" H
Standard Berg (FCI) Connector

QM35 Optical Rotary Encoder

QM35 Optical Rotary Encoder

Incremental & Commutation
Full Complement Outputs
Low Profile: Ø1.44" x 0.43" H
Bearingless Modular Design
1 MHz Frequency Response
Standard JAE Connector

QML35 Optical Rotary Encoder

QML35 Optical Rotary Encoder

Incremental & Commutation
Single Ended Outputs
Low Profile: Ø1.44" x 0.43" H
Bearingless Modular Design
1 MHz Frequency Response
Standard Berg (FCI) Connector

QM22 Optical Rotary Encoder

QM22 Optical Rotary Encoder

Miniature Package Size:
Ø1.024" x 0.486" H
Full Complement Incremental
Single Ended Commutation
Bearingless Modular Design
Standard JAE Connector

QR145 Optical Rotary Encoder

QR145 Optical Rotary Encoder

Incremental & Commutation
Highly Customizable Options:
IP66 Sealed, 5-26V Operation,
High Temperature, etc.
Ø1.45" x 0.87" H
Flying Leads Cable

QR200 Optical Rotary Encoder

QR200 Optical Rotary Encoder

Incremental & Commutation
Bore Sizes Up To Ø0.625"
Highly Customizable Options:
High Temp, 5-26V Operation, etc.
Ø2.00" x 0.93" H
Flying Leads Cable

QDH20 Optical Rotary Encoder

QDH20 Optical Rotary Encoder

For Industrial Applications
IP66 & IP64 Sealing Standard
Size 20 & 25 Flange and Servo
Cable Gland or MS Connector
5-26V Operation Standard
Line Driver/Open Collector ABZ

QR12 Optical Rotary Encoder

QR12 Optical Rotary Encoder

Ø1.22" x 0.99" H
Highest Resolution Encoder
Sin/Cos or Digital Incremental
High Pole Count Commutation
Standard JAE Connector

LP12 Optical Rotary Encoder

LP12 Optical Rotary Encoder

Low Profile: Ø1.22" x 0.82" H
Highest Resolution Encoder
Sin/Cos or Digital Incremental
High Pole Count Commutation
Standard JAE Connector

HR12 Optical Rotary Encoder

HR12 Optical Rotary Encoder

HEDS/HEDM Compatible Mount
IP52 Sealed
Ø1.42" x 1.12" H
Sin/Cos or Digital Incremental
High Pole Count Commutation

JR12 Optical Rotary Encoder

JR12 Optical Rotary Encoder

Jam Nut Mounting
Size 15 Resolver Style
Ø1.22" x 1.03" H
Sin/Cos or Digital Incremental
High Pole Count Commutation

QR787 Shaft Style Optical Rotary Encoder

QR787 Shaft Style Optical Rotary Encoder

Incremental Solid Shaft
Potentiometer Replacement
Ø0.787" x 0.875" H
Optional 5-26V Operation
Male Pins or Ribbon Cable

QR787 (Blind Bore) Optical Rotary Encoder

QR787 (Blind Bore) Optical Rotary Encoder

Incremental Hollow Bore
Potentiometer Replacement
Ø0.787" x 1.23" H
Optional 5-26V Operation
Male Pins or Ribbon Cable

QR110 Optical Rotary Encoder

QR110 Optical Rotary Encoder

Size 11 Resolver Replacement
Incremental Solid Shaft
Ø1.062" x 0.813" H
Optional 5-26V Operation
Male Pins or Ribbon Cable

What is an Optical Rotary Encoder?

Optical Rotary Encoders, also known as shaft encoders, are electromechanical position feedback devices. The output data they generate provides information to control systems and allows them to determine position, speed, acceleration, deceleration and travel distance in motion control applications.

An optical encoder consists of the following components: a moveable disc, an LED (Light Emitting Diode) source, a photo detector and a signal processor that converts the analog waveforms to digital waveforms.

The encoder disc, or code wheel, has a pattern of spaces, called windows, on it. When the LED light passes through one side of the disc, the photodiode detects interruptions. The photodiode creates analog signals which are processed and digitized for use by external control devices.

Industrial and Commercial Applications that Utilize Optical Rotary Encoders:

  • Aerospace & Defense
  • Automated Guided Vehicles (AGV)
  • Autonomous Mobile Robots (AMR)
  • Conveyor Applications
  • Elevators
  • Factory Automation
  • Galvanometer Scanners
  • Industrial Controls
  • Medical Devices
  • Off-Highway Vehicles
  • Oil & Gas
  • Passenger Rail
  • Pulp & Paper Mills
  • Robotics
  • Rotating Radar Platforms
  • Servo Motors
  • Steel Mills
  • Stepper Motors
  • String Potentiometers
  • Wood Processing

Since 1989, Quantum Devices, Inc. has been known for their rotary encoder manufacturing innovation. Their full line of high performance encoders fit a wide variety of industries and applications. To find out which rotary encoder would be best for your specific application, contact Quantum Devices today!

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