发明名称 |
Illuminable push button switching unit |
摘要 |
An improved push button switching unit is proposed of which the indicia on the key top is recognizable even in a dark place. Namely, a phosphorescent layer emitting phosphorescence even in a dark place is formed on the upper surface of the key top to provide recognizability of the indicia and further the switching unit is provided with a light sensor means and a light source which is lighted when the ambient lightness is low as detected by the sensor means. When the switching unit is used continuously in a dark place, the light source repeats cycles of a lighting period, in which the phosphorescent layer accumulates the energy of light, and a dark period, in which the phosphorescent layer emits phosphorescence by means of the accumulated energy, so that the power consumption for lighting the light source can be saved.
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申请公布号 |
US5655826(A) |
申请公布日期 |
1997.08.12 |
申请号 |
US19960621027 |
申请日期 |
1996.03.22 |
申请人 |
SHIN-ETSU POLYMER CO., LTD. |
发明人 |
KOUNO, FUMIO;NAKANO, SADAO |
分类号 |
H01H13/02;H01H13/14;H01H13/702;(IPC1-7):H04M1/22 |
主分类号 |
H01H13/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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