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US 7,888,613 B2Granted
Flexible light guide for membrane switch
AssigneeCoactive Technologies, Inc.
InventorsPeter Andrew Jeffery, Jason Tsi-Tsun Lin
Life of this patent
Estimating the term…
Abstract
In an embodiment, a membrane switch may include a flexible light guide having a first refractive index. The flexible light guide may include a first wall, an opposing second wall, and one or more additional walls. One or more of the first wall, the second wall and the additional walls may be disposed adjacent to a substance including a second refractive index that is lower than the first refractive index.
Claims19
A membrane switch, comprising:
- a flexible light guide having a first refractive index, the flexible light guide comprising:
- a first wall,
- an opposing second wall, and
- one or more additional walls,
- wherein one or more of the first wall, the second wall and the additional walls are disposed adjacent to a substance comprising a second refractive index that is lower than the first refractive index, and
- wherein the light guide further comprises a reflective material disposed adjacent to the substance having the second refractive index.
3 more elements
A dome sheet, comprising:
- a light guide;
- a plurality of moveable contacts;
- and
- a patterned adhesive which the bonds the light guide to the moveable contacts so that the patterned adhesive forms one or more gaps between the moveable contacts and the light guide;
- wherein
- the light guide comprises a first wall and an opposing second wall,
- the first wall is bonded to the patterned adhesive and
- the second wall comprises a flexible, reflective material.
5 more elements
A membrane switch, comprising:
- a circuit board comprising a plurality of fixed electrical contacts;
- a moveable contact positioned over a first one of the fixed electrical contacts so that the moveable contact touches the first fixed electrical contact when depressed and does not touch the first fixed electrical contact when relaxed;
- a patterned adhesive bonded to the moveable contact;
- and
- a light guide bonded to the patterned adhesive,
- wherein the patterned adhesive bonds the light guide to the moveable contact so that the patterned adhesive forms one or more gaps between the moveable contact and the light guide.
3 more elements
Dependencies are inferred from the claim text.