Lighting device with central symmetry for a dial

Details Lighting device with central symmetry for a dial Lighting device with central symmetry for a dial

2006-05-02

2006-05-02

Miska, Vit W. (Department: 2841)

Horology: time measuring systems or devices

Chronological

With auxiliary illumination for display

C368S277000, C368S296000, C362S026000, C362S029000, C362S623000

Reexamination Certificate

active

07038976

ABSTRACT:
A light source (15) is housed in a housing (6) of a case, underneath the dial (10) opposite a guide (17) directing the light onto a reflector (20), formed in a hollow in the internal or external face of a crystal (1) the thickness of which decreases regularly from the center to the periphery thereof for reorienting the light by total internal reflection into the crystal (1) until it emerges towards the dial (10) when the maximum refractive index is exceeded.

REFERENCES:
patent: 2761056 (1956-08-01), Lazo
patent: 3328570 (1967-06-01), Balchunas
patent: 3349234 (1967-10-01), Schwarz
patent: 3859782 (1975-01-01), Kitai
patent: 4115994 (1978-09-01), Tomlinson
patent: 4118924 (1978-10-01), Foellner
patent: 5984485 (1999-11-01), Poli
patent: 6106127 (2000-08-01), Fuwausa
patent: 6299321 (2001-10-01), Fuwausa
patent: 6452872 (2002-09-01), Teijido et al.
patent: 6647199 (2003-11-01), Pelka et al.
patent: 6730530 (2004-05-01), Fuwausa et al.

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