Hand position detecting device and electronic timepiece
US8467274B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 2010 |
| Grant date | Jun 18, 2013 |
| Priority date | — |
| Expiry date | Jan 4, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04R60/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A hand position detecting device including: a first gear rotating with a minute hand; a second gear rotating with a second hand; a first detection target portion that is provided on the first gear and identifiable by light irradiation; a second detection target portion that is provided on the second gear and identifiable by light irradiation; and a detector, wherein the second detection target portion is formed to be divided into a plurality of parts over a predetermined angular range out of a center angle of 360° of the second gear, and a presence-or-absence pattern of the second detection target portion in an angular range of successive N (N represents one of 5 to 10) angular segments with any angular segment being set as a start point is made different when the angular segment of the start point is different.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.