Key panel and strip switch assembly configurations having variable aspect ratios and method of making

• US 6,365,848 B1
• Filed: 02/25/2000
• Issued: 04/02/2002
• Est. Priority Date: 02/25/2000
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Maple, Larry E
• Primary Examiner(s): Scott, J. R.
• Application Number:
  US09/514,213
• Time in Patent Office: 767 Days
• Field of Search: 200/5.A, 200/5.R, 200/86.R, 200/512-517, 200/292, 200/293-296, 174/250-268, 361/679-681, 361/748, 361/749, 341/22-35
• 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 2229/022 Modular assembly
• CPC Class Codes: H01H 2229/034 Positioning of layers
• CPC Class Codes: H01H 2229/038 Folding of flexible printed circuit

Abstract

A key panel includes a key panel configuration having a number of switch locations arranged in a pattern so as to define an aspect ratio for the key panel configuration. A strip of switch material having an aspect ratio that is greater than the aspect ratio of the key panel configuration and having a number of switches that is at least equal to the number of switch locations for the key panel configuration is provided with at least one fold therein so as to arrange the number of switches on the strip of switch material in the pattern defined by the key panel configuration.

Claims

1. A key panel, comprising:

a key panel configuration having a number of switch locations arranged in a pattern so as to define an aspect ratio for said key panel configuration; and

a strip of switch material having an aspect ratio that is greater than the aspect ratio of said key panel configuration, said strip of switch material also having a number of switches that is at least equal to the number of switch locations for said key panel configuration, said strip of switch material having at least one fold formed therein so as to arrange in the pattern the number of switches provided on said strip of switch material.

2. The key panel of claim 1, further comprising a subpanel, said strip of switch material being positioned in contact with said subpanel, said subpanel providing support for said strip of switch material.

3. The key panel of claim 2, wherein said strip of switch material is affixed to said subpanel.

4. The key panel of claim 2, further comprising an overlay member positioned over said strip of switch material so that said strip of switch material is positioned between said overlay member and said subpanel.

5. The key panel of claim 1, wherein said strip of switch material comprises:

a bottom membrane having at least one switch contact thereon; and

a top membrane having at least one dome formed thereon, said top membrane being positioned adjacent said bottom membrane so that said at least one dome formed on said top membrane is aligned with said at least one switch contact on said bottom membrane so that said at least one dome closes said at least one switch contact when said at least one dome is depressed.

6. The key panel of claim 5, wherein said at least one switch contact provided on said bottom membrane comprises a first electrically conductive trace and a second electrically conductive trace, said first and second electrically conductive traces being positioned in spaced-apart relationship on said bottom membrane, and wherein said at least one dome formed on said top membrane comprises an electrically conductive portion, said electrically conductive portion on said at least one dome contacting at least portions of both said first and second electrically conductive traces on said bottom membrane when said at least one dome is depressed.

7. The key panel of claim 5 further comprising a spacer defining at least one opening therein, said spacer being positioned between said bottom membrane and said top membrane so that said at least one opening in said spacer is aligned with said at least one switch contact provided on said bottom membrane.

8. The key panel of claim 5, further comprising at least one key top positioned over said at least one dome formed on said top membrane, said at least one key top actuating said at least one switch contact provided on said bottom membrane when said key top is depressed.

9. The key panel of claim 8, further comprising a bezel defining at least one opening therein sized to receive said at least one key top, said bezel being positioned over said top membrane member so that said at least one key top protrudes through said at least one opening provided in said bezel.

10. The key panel of claim 1, wherein said strip of switch material comprises a front side and a back side, each of said switches provided in said strip of switch material being actuated from the front side of said strip of switch material.

11. The key panel of claim 10, wherein said key panel configuration defines a front side and a back side and wherein said strip of switch material is folded so that at least one of said switches is located on the front side of said key panel configuration and so that at least one of said switches is located on the back side of said key panel configuration.

12. The key panel of claim 1, wherein said strip of membrane type switch material comprises:

a bottom membrane having at least one switch contact thereon;

a spacer defining at least one opening therein, said spacer being positioned adjacent said bottom membrane so that said at least one opening in said spacer is aligned with said at least one switch contact provided on said bottom membrane; and

a top membrane having at least one dome formed thereon, said top membrane being positioned adjacent said spacer so that said at least one dome formed on said top membrane is aligned with said at least one opening in said spacer so that said at least one dome closes said at least one switch contact when said at least one dome is depressed.

13. The key panel of claim 12, further comprising an overlay member positioned over said top membrane.

14. The key panel of claim 12, wherein said at least one switch contact provided on said bottom membrane comprises a first electrically conductive trace and a second electrically conductive trace, said first and second electrically conductive traces being positioned in spaced-apart relationship on said bottom membrane, and wherein said at least one dome formed on said top membrane includes an electrically conductive portion provided thereon, said electrically conductive portion on said at least one dome contacting portions of both said first and second electrically conductive traces on said bottom membrane when said at least one dome is depressed.

15. A key panel, comprising:

a key panel configuration having a number of switch locations arranged in a pattern so as to define an aspect ratio for said key panel configuration; and

switch material strip means having an aspect ratio that is greater than the aspect ratio of said key panel configuration for providing switches at the switch locations and in the pattern defined by said key panel configuration.

16. The key panel of claim 15, further comprising subpanel means positioned adjacent said switch material strip means for supporting said switch material strip means.

17. The key panel of claim 15, further comprising overlay means positioned over said switch material strip means for protecting said switch material strip means.

18. The key panel of claim 15, further comprising key top means positioned over said switch material strip means for actuating said switch material strip means.

19. The key panel of claim 15, further comprising bezel means having an opening therein sized to receive said key top means, said bezel means positioned over said switch material strip means for holding said key top means adjacent said switch material strip means and for allowing said key top means to project through the opening in said bezel means.

20. A method for fabricating a key panel, comprising:

selecting a key panel configuration having a number of switch locations arranged in a pattern so as to define an aspect ratio for said key panel configuration;

selecting a strip of switch material having an aspect ratio that is greater than the aspect ratio of said key panel configuration, said strip of switch material also having a number of switches that is at least equal to the number of switch locations for said key panel configuration; and

folding said strip of switch material so as to arrange in the pattern the number of switches provided on said strip of switch material.

21. A method for fabricating a key panel, comprising:

selecting a key panel configuration having a number of switch locations arranged in a pattern so as to define an aspect ratio for said key panel configuration;

fabricating a strip of switch material having an aspect ratio that is greater than the aspect ratio of said key panel configuration, said strip of switch material also having a number of switches that is at least equal to the number of switch locations for said key panel configuration; and

folding said strip of switch material so as to arrange in the pattern the number of switches provided on said strip of switch material.