Indicator device

Details Indicator device Indicator device

2011-04-05

2011-04-05

Ton, Anabel M (Department: 2875)

Illumination

Illuminated scale or dial

C362S311010, C362S603000, C362S612000

Reexamination Certificate

active

07918572

ABSTRACT:
An indicator device includes a light emitting element for emitting light, and a light conducting plate having a light incidence surface for conducting light from the light emitting element inside thereof and a light output surface, for a lighted indication by the light output surface. The light conducting plate has a triangular recess recessed to form with prescribed recess depths in one planer surface thereof, for light from the light emitting element to be reflected in part. The triangular recess has a recess extremity constituting a single vertex disposed in position on an optical axis of the light emitting element and nearer to the light incidence surface than other end parts thereof. The recess depths becomes shallower as the V-form recess extends from the recess extremity, allowing for an evenness of luminance of light over the light output surface formed on the light conducting plate.

REFERENCES:
patent: 6805456 (2004-10-01), Okuwaki
patent: 7448787 (2008-11-01), Kim et al.
patent: 2002/0141174 (2002-10-01), Parker et al.
patent: 2000-149635 (2000-05-01), None
patent: 2007-184191 (2007-07-01), None
Official Action issued on May 11, 2010, in the counterpart Chinese application.

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