Metal dome sheet in mobile communication terminal and keypad thereof
AssigneeLG Electronics Inc.
InventorSang Eun Nam
Life of this patent
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Abstract
A keypad of a mobile communication terminal includes a contact sheet having contacts preferably shaped as hemispherical domes which deflect to turn on/off switch contact point pairs on a printed circuit board. The contact sheet further includes band parts covering the domes and an insulating sheet having at least one pair of semicircular openings for exposing portions of the domes. The insulating sheet is preferably made of a light-reflecting material/color which disperses light to illuminate keys of the keypad.
Claims45
A contact structure, comprising:
- (a) a contact;
- (b) a band at least partially covering the contact.
A keypad, comprising:
- (a) a printed circuit board having a pair of switch contact points;
- (b) a contact;
- and
- (c) a band at least partially covering the contact.
16 A contact structure, comprising:
- a contact;
- and
- a first layer at least partially covering a surface of the contact.
The contract structure of claim 16, wherein the first layer includes at least one opening which exposes a surface of the contact.
The contact structure of claim 16, wherein the first layer has a light color.
The contact structure of claim 16, wherein the first layer has a light-diffusing color.
The contact structure of claim 16, wherein the first layer is an insulating layer.
The contact structure of claim 16, further comprising:
- a second layer formed over the first layer.
The contact structure of claim 16, wherein the contact has at least substantially a dome shape.
The contact structure of claim 16, wherein the first layer include a portion which forms a band across the surface of the contact, wherein a width of the band is less than a width of the contact.
The contact structure of claim 16, wherein the first layer completely covers the contact.
A keypad, comprising:
- a key switch;
- and
- a contact structure adjacent the key switch, said contact structure including.
- (a) a contact, and
- (b) a first layer at least partially covering a surface of the contact.
Dependencies are inferred from the claim text.