Illumination type key sheet
First Claim
1. An illumination type key sheet which has a depressing operation portion and which is arranged on a circuit board on which an electronic component generating heat is mounted, comprising:
- an EL member for illuminating the depressing operation portion; and
a sheet-like heat diffusion member which promotes heat diffusion in a surface direction upon receiving heat generated by the electronic component.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is an illumination type key sheet which efficiently diffuses local heat generated by a mounted element on a board and which makes an EL member relatively free from generation of unevenness in luminance. An illumination type key sheet is equipped with a graphite sheet which diffuses heat in a surface direction. Thus, if a semiconductor device on a board generates heat, it is possible to prevent local heating of an EL sheet by the graphite sheet, making the EL sheet relatively free from generation of unevenness in luminance. At the same time, it is possible to prevent occurrence of problems, such as malfunction and failure, due to heat storage of the semiconductor device. As compared with other materials, the graphite sheet exhibits high heat conductivity allows efficient heat diffusion, and is lightweight. Thus, it can meet the demand for a reduction in a weight of portable electronic apparatuses.
15 Citations
20 Claims
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1. An illumination type key sheet which has a depressing operation portion and which is arranged on a circuit board on which an electronic component generating heat is mounted, comprising:
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an EL member for illuminating the depressing operation portion; and
a sheet-like heat diffusion member which promotes heat diffusion in a surface direction upon receiving heat generated by the electronic component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification