Self-luminescent light source for liquid crystal display watch

Details Self-luminescent light source for liquid crystal display watch Self-luminescent light source for liquid crystal display watch

1979-04-16

1981-08-18

Weldon, Ulysses

Horology: time measuring systems or devices

Displays or display device details

With luminous material

368239, 368242, 368 82, 368 84, G04B 1932

Patent

active

042850550

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 radioactive element promethium (.sup.147 Pm) 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 Bremsstrahlung ascribable to beta rays given out from the promethium, a first cover which is disposed on the side of the fluorescent substance layer remote from the reflective layer and which serves to absorb the beta rays given out from the promethium and to transmit the light from the fluorescent substance layer, and a second cover which is disposed on the side of the first cover remote from the fluorescent substance layer and which serves to perform shielding from Bremsstrahlung ascribable to the beta rays given out from the promethium and to transmit the light from the fluorescent substance layer.

REFERENCES:
patent: 1388855 (1921-08-01), Fordyce
patent: 2885561 (1959-05-01), Lange
patent: 3950078 (1976-04-01), Zatsky
patent: 4104627 (1978-08-01), Thuler
patent: 4126384 (1978-11-01), Goodman et al.

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