Self-luminescent light source for liquid crystal display watch
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United States of America Patent
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-
Jun 30, 1981
Grant Date -
N/A
app pub date -
Apr 11, 1979
filing date -
Apr 12, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A self-luminescent light source for a liquid crystal display watch characterized by comprising a fluorescent substance layer which has a light reflectivity and which contains a radioactive substance in at least a part thereof, a reflective layer which is disposed on one surface of the fluorescent substance layer and which serves to reflect and scatter fluorescence from the fluorescent substance layer, a case which is disposed on the side of the reflective layer remote from the fluorescent substance layer and which serves to perform shielding from radiation given out from the radioactive substance, and a cover which is disposed on the side of the fluorescent substance layer remote from the reflective layer and which serves to absorb the radiation given out from the radioactive substance and to transmit the light from the fluorescent substance layer.
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