Dual purpose, weather resistant data terminal keyboard assembly including audio porting

• US 4,081,631 A
• Filed: 12/08/1976
• Issued: 03/28/1978
• Est. Priority Date: 12/08/1976
• Status: Expired due to Term

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Feder, Alvin
• Primary Examiner(s): Scott, James R.
• Application Number:
  US05/748,616
• Time in Patent Office: 475 Days
• Field of Search: 200/5 A, 200/159 B, 200/340, 179/179, 235/156, 181/141
• US Class Current: 200/5.00A
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 13/785 characterised by the material of the contacts, e.g. conductive polymers
• CPC Class Codes: H01H 13/84 characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback legends H01H13/83
• CPC Class Codes: H01H 2201/032 Conductive polymer; Rubber
• CPC Class Codes: H01H 2223/002 sealed
• CPC Class Codes: H01H 2223/04 portable; hand held
• CPC Class Codes: H01H 2239/034 Environmental protection
• CPC Class Codes: H01H 2239/048 comprising microphone or speaker

Abstract

An improved data terminal utilizing tactile switch assemblies with specialized sound apertures provide reduced panel space requirements and indirect sound paths for miniature electronic apparatus. A maximum number of switches can be accommodated on the instrument panel with no separate speaker/microphone grille required. Non-aligned sound apertures provide maximal weather protection for speaker and microphone mounted behind the switch assembly panel. The switch assembly design seals off the remainder of the unit from weather or dust damage.

Claims

1. A dual purpose, weather resistant data terminal keyboard arrangement suitable for use in electronic apparatus which includes audio transducer means, the arrangement comprising:

a housing cover having a plurality of apertures selectively arranged therein;

a multiplicity of key buttons having normal and depressed positions and supported immediately adjacent the rearmost side of the housing cover, each including a portion projecting through one of the housing cover apertures, the portions having apertures extending from above the upper surface of the housing cover to below the lower surface when the key button is in the normal position;

a switching assembly positioned closely adjacent the rearmost side of the housing cover and having portions adjacent the key buttons spaced apart therefrom when said key buttons are in the normal position, the assembly having switches thereon for cooperating with the key buttons to close circuits in the apparatus, the assembly having apertures therethrough non-aligned with the housing cover and key button apertures; and

wherein when the transducer means is positioned immediately adjacent the rearmost end of the switching assembly apertures, weather protection for and indirect sound paths to the transducer means are provided through the apertures in the housing cover, the key buttons and the switching assembly.

2. A dual purpose keyboard arrangement according to claim 1 wherein the support panel is the front portion of an electronic apparatus housing.

3. A dual purpose keyboard arrangement according to claim 1 wherein the transducer means includes a microphone and a speaker.

4. A dual purpose keyboard arrangement for an electronic apparatus including audio transducer means, the arrangement comprising:

a housing cover having a multiplicity of apertures therein;

a non-conductive switch panel supported immediately adjacent the rearmost side of the housing cover for retaining a plurality of conductive bridging elements in alignment with the apertures in the housing cover, and having portions thereof spaced apart from the housing cover with apertures therein through said spaced apart portions and positioned for non-alignment with the apertures in the housing cover;

a rigid insulating member adjacent the rearmost side of the switch panel, having switch contacts affixed thereon in alignment with the bridging elements and having apertures therein positioned in alignment with the apertures in the switch panel;

a pluarlity of key button means, each comprising

a body portion for mating with and projecting through an aperture in the housing cover, for causing a bridging element to bridge the corresponding switch contacts upon depression of the key button means, and having at least one aperture extending from above the upper surface of the housing cover to below the lower surface when the key button is in the normal position; and

a flange portion for being retained between the housing cover and the insulating member, and

wherein when the transducer means is positioned adjacent the rearmost side of the insulating member weather protection for and indirect sound paths to the transducer means are provided through the apertures in the undepressed key button means, the housing cover, the switch panel and the insulating member.

5. A dual purpose keyboard arrangement according to claim 4 wherein the bridging elements are supported by thinned, normally raised and self-restoring areas of the switch panel, and are of a material having conductive elements therein.

6. A dual purpose keyboard arrangement according to claim 4 wherein the bridging elements become conductive under compressive force.

7. A dual purpose keyboard arrangement according to claim 4 wherein the insulating member is a circuit board and the switch contacts are plated thereon.

8. A dual purpose keyboard arrangement according to claim 4 wherein the switch contacts are inter-digitated elements.