Small optical encoders

14 June 2006 Opto-Electronics

Avago Technologies' reflective incremental optical encoder, the AEDR-8400 series, is billed as the industry's smallest, coming in a surface-mount package with dimensions of 3,00 mm length by 3,28 mm width by 1,262 mm height.

These encoders combine extremely small size with 254 lines per inch (LPI) resolution, low power consumption and wide operating temperature range. These attributes make it a good choice for consumer, office, industrial and automotive interior applications ranging from scanners, printers, miniature cameras, and seat adjustment and rear view mirror controls in automobiles.

The Avago AEDR-8400 series of reflective encoders consist of an LED light source, a special photodetector IC with integrated electronics, and integrated optics. They operate from a single 2,8 V (nominal) supply, drawing 12 mA (including 6 mA LED current), typical. They can be used with a reflective code wheel to sense rotary position and velocity, or with a linear code strip to sense linear position and velocity. The devices provide two-channel digital outputs in quadrature, which provides both count and direction information. They are said to be insensitive to axial play and maintain performance and accuracy over a wide variation in the gap between sensor and code wheel or strip.

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