Illumination device for an indicating needle

Details Illumination device for an indicating needle Illumination device for an indicating needle

2008-12-12

2010-02-23

Sawhney, Hargobind S (Department: 2885)

Illumination

Illuminated scale or dial

C362S026000, C362S027000, C116S288000, C116S303000

Reexamination Certificate

active

07665857

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.

REFERENCES:
patent: 6302551 (2001-10-01), Matumoto
patent: 6461006 (2002-10-01), Matumoto
patent: 6714126 (2004-03-01), Wada
patent: 7357096 (2008-04-01), Tane

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