| 摘要 |
PURPOSE:To simplify the assembling by using a case and a hard wiring board so as to support a key sheet thereby eliminating the need for a retainer iron plate and decreasing the thickness of the entire set and the weight of set in addition to the reduction in the number of components. CONSTITUTION:A key part 1 consists of a key top 18, a key sheet 5, cases 2, 3 and a hard wiring board 4 and the case 2 and the hard wiring board 4 are provided to form the same lane. Then the lower face of the key sheet 5 is brought into contact with the case 2 and the hard wiring board 4 and the case 2 and the hard wiring board 4 support the key sheet 5. Thus, no iron retainer is required and the insulation sheet an the air gap insulating the retainer and the wiring board are not required to make the thickness of the set thinner. Moreover, the weight of the set is made light, the number of component is decreased and the assembling work is simplified.
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