Inproceedings,

Miniaturized optical encoder with micro structured encoder disk

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Proceedings of the World Congress on Micro and Nano Manufacturing (WCMNM 2018), page 363-366. (2018)
DOI: 10.3850/978-981-11-2728-1_28

Abstract

A novel optical incremental and absolute encoder based on an opto-ASIC and an encoder disk carrying micro manufactured structures is presented. 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, a control of the light source as well as the digital position processing. A laser diode is assembled in the center on top of the opto-ASIC together with a micro manufactured polymer lens. The latter is fabricated using ultra precision machining. The encoder disk was fabricated using micro injection molding and contains microstructures forming a Blaze grating. This way a 10 bit optical encoder with a form factor of 1cm³ was realized.

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