Multiturn absolute encoder using spatial filter

Fusao Kohsaka*, Toshio Iino, Kunio Kazami, Hiroshi Nakayama, Toshitsugu Ueda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


This paper describes a vernier-type multiturn absolute encoder which uses a spatial filter to interpolate between encoder slit positions. The absolute angle can be derived from the optical encoder which uses a LED, photodiodide array and a coded disc consisting of three tracks. The accuracy of angular measurement for a prototype encoder was as high as 1/1000,000, and the encoder can respond up to 3 000 rpm. The shaft revolutions are tallied by a magnetic bubble counter which uses a 'memory wheel' principle to count up to 32 487 turns. No electrical energy is used to store data or count revolutions.

Original languageEnglish
Pages (from-to)94-99
Number of pages6
JournalJSME International Journal
Issue number1
Publication statusPublished - 1990 Mar
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)


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