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Open AccessArticle

Miniaturized Optical Encoder with Micro Structured Encoder Disc

1
Hahn-Schickard, 70569 Stuttgart, Germany
2
Institut für Mikroelektronik Stuttgart, 70569 Stuttgart, Germany
3
Institute for Micro Integration (IFM), University of Stuttgart, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(3), 452; https://doi.org/10.3390/app9030452
Received: 30 November 2018 / Revised: 22 January 2019 / Accepted: 23 January 2019 / Published: 29 January 2019
(This article belongs to the Special Issue Micro/Nano Manufacturing)
A novel optical incremental and absolute encoder based on an optical application-specific integrated circuit (opto-ASIC) and an encoder disc carrying micro manufactured structures is presented. The physical basis of the encoder is the diffraction of light using a reflective phase grating. The opto-ASIC contains a ring of photodiodes that represents the encryption of the encoder. It also includes the analog signal conditioning, the signal acquisition, and the control of a light source, as well as the digital position processing. The development and fabrication of the opto-ASIC is also described in this work. A laser diode was assembled in the center on top of the opto-ASIC, together with a micro manufactured polymer lens. The latter was fabricated using ultra-precision machining. The encoder disc was fabricated using micro injection molding and contains micro structures forming a blazed grating. This way, a 10-bit optical encoder with a form factor of only 1 cm3 was realized and tested successfully. View Full-Text
Keywords: optical encoder; grating; blaze; injection molding; micro assembly; active alignment; opto-ASIC optical encoder; grating; blaze; injection molding; micro assembly; active alignment; opto-ASIC
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MDPI and ACS Style

Seybold, J.; Bülau, A.; Fritz, K.-P.; Frank, A.; Scherjon, C.; Burghartz, J.; Zimmermann, A. Miniaturized Optical Encoder with Micro Structured Encoder Disc. Appl. Sci. 2019, 9, 452.

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