Membrane switch and production method thereof
First Claim
1. A membrane switch comprising a pair of conductive electrode plates confronting each other and a spacer separating the electrode plates, wherein an operating force required to operate the membrane switch by pressing the conductive electrode plates together corresponds to a force exerted by a round rod having a hemispherical tip with a radius of curvature of 5 mm at a range of 0.03 to 0.2 kg;
- and wherein the spacer is in a form of a film having through holes at aperture to spacer ratio of 50% or more.
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Accused Products
Abstract
A membrane switch comprising a pair of electrode plates and a spacer separating the plates, wherein the operating force required to operate the membrane switch by pressing it with a rod having a hemispherical tip with a radius of curvature of 5 mm is within the range of 0.03 to 0.2 kg. The spacer is in the form of a film, the film has through holes, and the aperture ratio of the through holes is 50% or above. The effect is that a membrane switch exhibiting no malfunction, negligible variation in the operating force, and excellent in durability can be obtained.
26 Citations
2 Claims
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1. A membrane switch comprising a pair of conductive electrode plates confronting each other and a spacer separating the electrode plates, wherein an operating force required to operate the membrane switch by pressing the conductive electrode plates together corresponds to a force exerted by a round rod having a hemispherical tip with a radius of curvature of 5 mm at a range of 0.03 to 0.2 kg;
- and wherein the spacer is in a form of a film having through holes at aperture to spacer ratio of 50% or more.
- View Dependent Claims (2)
Specification
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- Resources
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Current AssigneeSumitomo Electric Industries Limited (Sumitomo Corporation)
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Original AssigneeSumitomo Electric Industries Limited (Sumitomo Corporation)
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InventorsYoshida, Noriyuki, Uemiya, Takafumi, Yamazaki, Sekiya, Fukuda, Yutaka, Osoegawa, Misako
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Primary Examiner(s)FRIEDHOFER, MICHAEL A
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Application NumberUS09/486,749Time in Patent Office705 DaysField of Search178/18-20, 200/5.A, 200/512-517, 200/511, 340/272, 400/472, 400/473, 400/479, 400/477US Class Current200/512CPC Class CodesH01H 2227/006 SpacerH01H 2227/024 Spacer elementsH01H 2227/032 Operating forceH01H 3/141 Cushion or mat switches
