Dome contact used in pushbutton switch and method for fabricating same
AssigneeChi Mei Communication Systems, Inc.
InventorCHENG-LUNG CHANG
Life of this patent
Estimating the term…
Abstract
A dome contact (32) for pushbutton switches (300) includes a diaphragm (33) having a reversible dome portion (331), and a bump (34) projecting from a central portion of a convex surface of the dome portion. A method for fabricating the dome contact includes steps of: providing a diaphragm formed by injection molding or screen printing; and forming a bump on a central portion of a convex surface of the diaphragm via thermal extrusion laminating technology of rapid prototyping technology.
Claims8
A dome contact for pushbutton switches, comprising:
- a diaphragm having a reversible dome portion, and
- a bump projecting from a central portion of a convex surface of the dome portion.
The dome contact as claimed in claim 2, wherein the bump has an isosceles trapezoid shaped cross section, with the end having a smaller area mounted to the dome portion.
The dome contact as claimed in claim 3, wherein the bump comprises multiple layers forming by repeatedly stacking layers of material on previous layers of material with each layer of material aligning with the previous layer of material and each layer of material having a diameter larger than that of the previous layer of material.
7-9. (canceled)
A pushbutton switch for portable electronic devices, comprising:
- a button configured for being pressed;
- a dome contact comprising a diaphragm having a reversible dome portion, and a bump projecting from a central portion of a convex surface of the dome portion and facing towards the button;
- and
- a fixed contact configured for electrically connect to the dome portion, the fixed contact and the button disposed at opposite sides of the dome contact.
Dependencies are inferred from the claim text.