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SEEING IS BELIEVING - A Miniature 3 Channel Optical Encoder!



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Seeing really is believing with Elesta's new miniature innovative Optical Encoder E OI R007 from Willow Technologies Limited,! Elesta have just added this miniature 3 channel optical encoder, in 7 x 13mm aluminium housing, to its wide product portfolio.

John Merril, Relays Product Manager at Willow, commented: This optical encoder is one of the smallest on the market, it has been fitted with 2 precision ball bearings guaranteeing exceptionally smooth running and a long service life at speeds of up to 80,000 rpm! Even at these high speeds, a very exact signal quality and accuracy is achieved.

Inside the miniature housing is the patented unique Elesta encoder system - the E OI R, an integrated system operating on the basis of a new optical focussing incidental light method.

Within the integrated system are multiple reflective parabolic shaped concave mirrors, forming the code segments of the code wheel. The clever design of the mirrors reflect only an extremely clear and steep concentration of light from the transmitter LED, ensuring exact signal quality and accuracy across the entire speed range. The encoder delivers 128 pulses at any rotation speed, to two outputs that are phase shifted by 90°. The third channel provides one index pulse per revolution.

The encoder is designed to operate with 4 mA current at 5V, making it ideal for battery-powered applications. Continued Merrill.

The E OI R007 housing is mounted using grub screws, securely braced against rotation. Coupling of the encoder with commercial clutch elements for connection to motors, gearboxes or the like, are just as straightforward as the adaptation of potentiometer knobs with clamps or a fixing screw. The chamfered output shaft has a diameter of 2 mm and is flattened on two sides. Dental drills and general robotics are typical applications.

Willow and Elesta have an excellent relationship and work together to provide extensive design support. It is possible to evaluate individual solutions integrating the encoder housing or using customer-specific systems or housing. The optical encoder is also available as a modular system in kit form, giving customers the option to integrate the sensor and code wheel kit in an existing housing, motor or system. Concluded Merrill.


Willow Technologies Limited, founded in 1989, provides solutions to customers by designing, manufacturing and supplying components and systems to the electrical and electronic marketplace across the globe. Specialists in switching, sensing, resistive and hermetic seal solutions, the company has a wide portfolio of technologies and over 100 years of application experience. With an in-house engineering capability and a production facility for rapid prototyping of custom parts, the company is well equipped to develop products matching customer specific application requirements. Willow is ISO9001: 2008 Registered.

For further information please contact:

John Merrill, This e-mail address is being protected from spambots. You need JavaScript enabled to view it , +44 (0) 1342 717102.

Willow Technologies Ltd. Unit 3 Borers Yard, Borers Arms Road, Copthorne, West Sussex, RH10 3LH, UK

Tel: +44 (0) 1342 717102, Fax: +44 (0) 1342 717014, Email:

CORPORATE: Solid State Group

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