Illuminated keyboard for electronic devices and the like

• US 4,320,268 A
• Filed: 02/19/1980
• Issued: 03/16/1982
• Est. Priority Date: 02/19/1980
• Status: Expired due to Term

• Current Assignee: Ericsson GE Mobile Communications Inc (Telefonaktiebolaget LM Ericsson)
• Original Assignee: General Electric Company
• Inventors: Brown, Robert E.
• Primary Examiner(s): Truhe, J. V.
• Assistant Examiner(s): Ginsburg, Morris
• Application Number:
  US06/123,105
• Time in Patent Office: 756 Days
• Field of Search: 348/712, 348/380, 348/381, 200/310, 200/313, 200/314, 200/5 A
• US Class Current: 200/5.00A
• CPC Class Codes: H01H 13/83 characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
• CPC Class Codes: H01H 2205/016 Separate bridge contact
• CPC Class Codes: H01H 2219/018 Electroluminescent panel
• CPC Class Codes: H01H 2219/062 Light conductor

Abstract

A keyboard is illuminated by an electroluminescent panel positioned between the keyboard push buttons and the switch contacts. The electroluminescent panel provides good illumination because of its proximity to the push buttons, and an actuator for each push button extends through the electroluminescent panel to insure positive operation of the respective switch contact.

Claims

1. An improved keyboard for electrical devices and the like comprising:

a. a switch having a first movable contact mechanically urged in a first direction, said first contact having means to be engaged for movement in a second direction opposite said first direction to engage a second contact and close said switch;

b. an electroluminescent panel positioned adjacent said switch in the vicinity of said means to be engaged;

c. and a push button positioned adjacent said electroluminescent panel on the side thereof away from said switch, said push button being formed of a relativey transparent material and having an actuator that extends from said push button through an opening in said electroluminescent panel for engaging said contact means to be engaged, whereby depression of said push button causes said first movable contact to move in said second direction and close said switch.

2. The improved keyboard switch of claim 1 wherein said push button is retained by a relatively light opaque material.

3. The improved keyboard switch of claim 1 or claim 2 wherein said first contact is of the dome type.

4. An improved switch arrangement comprising:

a. a push button formed of light transparent material, said push button having a finger actuable surface facing in a first direction and an elongated member extending from an opposite surface relative to said finger actuable surface and in a second direction opposite said first direction;

b. a relatively flat electroluminescent panel having one surface positioned adjacent said opposite surface of said push button for illuminating said push button, said electroluminescent panel having an opening with sides positioned around said elongated member, and having a second surface facing in said second direction;

c. and a switch mechanism positioned adjacent said second surface of said electroluminescent panel, said switch mechanism having operable means mechanically urged toward said elongated member for operation thereby.

5. The improved keyboard of claim 4, and further comprising a retaining portion positioned around said push button.

6. The improved keyboard of claim 4 or claim 5 wherein said switch mechanism is of the dome type having a convex contact member that can be depressed by said elongated member.

7. The improved keyboard of claim 6 wherein said switch mechanism has a second contact member positioned on the side of said convex contact member away from said elongated member, said second contact member being engaged by said convex contact member in response to said convex contact member being depressed.