Blue light encoder sensor chip sharpens resolution

Blue light encoder sensor chip sharpens resolution

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iC-Haus has released sensor chips for optical position encoders with photodiodes designed to operate with for blue light.
By eeNews Europe

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The shorter wavelength and penetration of blue-light photons improve the resolution, signal amplitude, harmonic distortion, and jitter performance of incremental and absolute encoders. That is because blue light causes less diffraction at the same slot width compared to higher wavelengths, thus resulting in sharper imaging.

Modern semiconductor processes provide small, shallow structures which can take advantage of the shorter penetration of blue light to improve efficiency. What’s more, smaller structures allow an interlaced photodiode layout which produces sine and cosine encoder signals with lower offset. In addition, a high fill-factor for the photosensitive areas is achieved by an equivalent geometrical transformation.

iC‑Haus has optimized the new incremental scanners in its high resolution iC‑PT H‑Series especially for blue light, under the Encoder blue trademark.

The new encoder chips of the iC-PT H-Series combine optimized scanning and signal interpolation in the smallest available space: a flat 5x5mm² optoQFN package with a plane window. Due to the optimized Phased-Array structure of the opto-chips, a minimal scanning area of only 1.9×3.1mm is sufficient to generate 10,000 pulses per revolution using a code disc of only 26mm in diameter.

The devices generate low-jitter encoder quadrature signals with index via 4 mA push-pull drivers in single, double and four-fold resolution for precise motor regulation. The index gating as well as the interpolation is easily selectable by pin. Output frequencies of up to 1.6 MHz are permitted, enabling motor speed control at up to 10,000 rpm with 10,000 pulses per revolution. Evaluation boards are available for the scanners together with plastic code discs and snap-on blue LEDs.

Visit iC-Haus at https://www.ichaus.com/encoder-blue

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