Meter having pointer-zero-position adjusting function
US6519999B2 · kind B2 · utility
9Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2001 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Jun 21, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2213/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A meter such as a speedometer for use in an automobile instrument panel includes a pointer driven by a stepping motor. A pulse voltage having a wider pulse width is supplied to the stepping motor to obtain a higher induced voltage to be compared with a threshold voltage for detecting the pointer-zero-position. After the pointer-zero-position is detected, the stepping motor is driven by a pulse voltage having a narrower pulse width to obtain a quicker response of the pointer. In this manner, the pointer-zero-position is accurately adjusted without sacrificing the quick response of the meter pointer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.