Illumination device for an indicating needle
US7665857B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2008 |
| Grant date | Feb 23, 2010 |
| Priority date | — |
| Expiry date | Dec 12, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K2360/6992
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An illumination device for an indicating needle includes a plurality of light sources, an indicating needle, a guiding member, and a luminance control unit. The indicating needle includes a needle body and a needle base. The base has an entrance surface and a reflection surface. A luminance control unit controls luminance of the light sources in response to turning of the indicating needle such that the luminance is lowest when a light emitted perpendicularly from a center of an emitting surface of the light source is reflected off a reflection surface's region which a longitudinal central line of the needle body intersects with, and that the luminance gradually increases as the light emitted by the light source from the center of the emitting surface thereof is reflected off a region that is more distant from the region which the longitudinal central line of the needle body intersects with.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.