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INPUT DEVICE WITH ILLUMINATION FUNCTION

  • US 20090073724A1
  • Filed: 11/10/2008
  • Published: 03/19/2009
  • Est. Priority Date: 05/12/2006
  • Status: Abandoned Application
First Claim
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1. An input device having an illumination function comprising a wiring board having a predetermined wiring pattern thereon containing a fixed contact point of a push-button switch, a light-emitting diode, a planar light-guide plate for guiding emission light from the light-emitting diode in a direction along a surface, a metal dome serving as a movable contact of the push-button switch, and a cover sheet having an actuator thereon for pressing the metal dome, wherein the wiring board includes at least a surface thereof, manufactured of a white translucent material, in contact with the light-guide plate,wherein the planar light-guide plate includes a plurality of prism grooves on either a surface thereof in contact with the wiring board or a surface thereof covered with the cover sheet, each prism groove having a mildly angled slope portion and a steeply angled slope portion steeper in angle than the mildly angled slope portion, and a through-hole for housing the metal dome on a portion corresponding to a formation portion of the fixed contact point,wherein an air layer is arranged between the prism groove bearing surface of the planar light-guide plate and the wiring board or the cover sheet, andwherein the metal dome is housed in the through-hole opened in the planar light-guide plate and has a function of reflecting the emission light from the light-emitting diode, guided through the planar light-guide plate and directed within the through-hole, toward the cover sheet.

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