Operating unit for a key switch

摘要

A key switch operating unit having an elastic cylinder hermetically interposed between the top surface of a housing and the lower surface of a flange portion of a key stem, and a rubber bottom cover covering the lower opening of the housing so as to define an airtight inner space. The housing has an inner partition wall and an outer peripheral wall to define a dust protective space. Small foreign substances such as dust and liquid tending to enter into the inside of the housing when operating the key switch can be prevented from entering.