Horology: time measuring systems or devices – Displays or display device details – With auxiliary illumination for display
Patent
1979-07-11
1981-02-10
Miska, Vit W.
Horology: time measuring systems or devices
Displays or display device details
With auxiliary illumination for display
G04B 1930
Patent
active
042505755
ABSTRACT:
An analog watch or clock is provided with an improved dial illiminator in the form of a molded clear plastic dial cap having a tubular section surrounding and extending axially behind the periphery of the dial and an annular rim section projecting inwardly from the tubular section over and in contact with the dial, and a point light source such as a minature incandescent bulb positioned behind the dial in a recess formed in the tubular section of the dial cap. The rim section of the dial cap typically includes a truncated-conical, light-reflecting outer peripheral surface for reflecting light from the tubular section into the rim section and an inner peripheral surface which defines a central aperture through which the shaft supporting the watch or clock hands passes. In operation, the tubular section of the dial cap functions to distribute light around the entire periphery of the dial while the rim section receives the peripheral light and directs it over the dial toward its center for illumination purposes.
To maximize dial illumination, a reflector cap having a corresponding tubular section and rim section is placed around the dial cap. In addition, a transparent, light-transmitting material can be placed between the rim section of the dial cap and the dial to provide optimum optical communication there between.
REFERENCES:
patent: 363959 (1887-05-01), Humbert
patent: 2083924 (1937-06-01), Scantlebury
patent: 2259910 (1941-10-01), Rylsky
patent: 3214577 (1965-10-01), Pbotzmann
patent: 3224184 (1965-12-01), Brien
patent: 3452538 (1969-07-01), Frey
patent: 3574993 (1971-04-01), Black
Miska Vit W.
Timex Corporation
Timmer Edward J.
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