Miniature Optical Encoder Promotes Signal Stability

With a read-head as small as 6.7 × 12.7 × 20.5 mm, Renishaw’s Atom non-contact optical linear and rotary incremental encoder system uses filtering optics with auto gain control (AGC) and auto offset control (AOC) for high signal stability and dirt immunity.

With a read-head as small as 6.7 × 12.7 × 20.5 mm, Renishaw’s Atom non-contact optical linear and rotary incremental encoder system uses filtering optics with auto gain control (AGC) and auto offset control (AOC) for high signal stability and dirt immunity. Applications include laser scanning, precision micro stages, microscopy, scientific research and space-critical motion control, inspection, and metrology, as well as work with semiconductors, medical products and DDR motors.

For metrology performance and accuracy, the miniature encoder is said to provide low sub-divisional error (SDE), low jitter and long-term reliability. Analog speeds range to 20 m/sec. (29,000 rpm on a 17-mm disc) and digital resolutions range to 1 nm when used with the company's interpolation electronics. The read-head includes a setup LED to ease installation and an auto-calibration routine to enable faster optimization. Scale options include linear and rotary (angle) scales in stainless steel and glass.

The read-head is available with either high-flex cable or flexible-printed circuit (FPC) output in both 20- and 40-micron scale options, with ultra-compact interface electronics in ACi and Ri options. The FPC variant reduces the overall package size and enables integration with ACi. A variety of high-accuracy scales is available, including industry-standard stainless steel tapes, high-accuracy linear glass spars, and rotary glass discs ranging from 17 to 108 mm in diameter.

Optional interfaces support interpolation factors ranging to ×20,000 for increased performance. Users can also use the sinusoidal signal output from the read-head for direct connection to analog drives and controllers.

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