KEY SWITCH SHEET AND KEY SWITCH MODULE
First Claim
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1. A key switch sheet comprising:
- a pressure sensitive adhesive layer for holding a contact spring by adhering to an apex portion of a dome-shaped contact spring at a back surface of a base material sheet;
wherein a thickness of the pressure sensitive adhesive layer at a region to be made to adhere to the apex portion of the contact spring is thicker than a thickness of the pressure sensitive adhesive layer at a peripheral region.
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Abstract
A key switch sheet has a pressure sensitive adhesive layer for holding a contact spring by adhering to an apex portion of a dome-shaped contact spring at a back surface of a base material sheet. A thickness of the pressure sensitive adhesive layer at a region to be made to adhere to the apex portion of the contact spring is thicker than a thickness of the pressure sensitive adhesive layer at a peripheral region.
15 Citations
25 Claims
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1. A key switch sheet comprising:
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a pressure sensitive adhesive layer for holding a contact spring by adhering to an apex portion of a dome-shaped contact spring at a back surface of a base material sheet; wherein a thickness of the pressure sensitive adhesive layer at a region to be made to adhere to the apex portion of the contact spring is thicker than a thickness of the pressure sensitive adhesive layer at a peripheral region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 23, 25)
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9. A key switch module substrate comprising
an apex portion of a dome-shaped contact spring that is made to adhere to a back surface of a base material sheet by a pressure sensitive adhesive or an adhesive, wherein the back surface of the base material sheet is made to adhere to a substrate formed with a first fixed contact and a second fixed contact, which are switched to a conduction state or an insulation state by the contact spring, by pressure sensitive adhesive or adhesive, wherein the contact spring is faced to the first fixed contact and the second fixed contact, wherein a thickness of the layer of the pressure sensitive adhesive or the adhesive at a region where the apex portion of the contact spring is made to adhere to the base material sheet is thicker than a thickness of the layer of the pressure sensitive adhesive or the adhesive at a peripheral region, and wherein a thickness of the layer of the pressure sensitive adhesive or the adhesive at a region where the base material sheet is made to adhere to the substrate is thicker than a thickness of the layer of the pressure sensitive adhesive or the adhesive at the peripheral region.
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14. A key switch sheet comprising:
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a pressure sensitive adhesive layer for holding a contact spring by adhering to an apex portion of the dome-shaped contact spring at a back surface of a base material sheet; wherein a region in which the pressure sensitive adhesive layer does not exist is formed at the periphery of the pressure sensitive adhesive layer formed at the region to be made to adhere to the apex portion of the contact spring, and the pressure sensitive adhesive layer is formed at a region further on the outer side of the region in which the pressure sensitive adhesive does not exist; and wherein the pressure sensitive adhesive layer formed at the region to be made to adhere to the apex portion of the contact spring and the pressure sensitive adhesive layer formed at the region on the outer side of the region in which the pressure sensitive adhesive layer does not exist are of same material. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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24. The key switch module according to clam 23, wherein
a light guide sheet for illuminating the key top from a back surface side is arranged between the key top and the key switch module substrate.
Specification