Flexible keyboard for computers

• US 5,220,521 A
• Filed: 01/02/1992
• Issued: 06/15/1993
• Est. Priority Date: 01/02/1992
• Status: Expired due to Term

• Current Assignee: Inpro II Licensing SARL
• Original Assignee: Cordata, Inc.
• Inventors: Kikinis, Dan
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): Ngo, Chuong D.
• Application Number:
  US07/816,109
• Time in Patent Office: 530 Days
• Field of Search: 364/709.01, 364/709.08, 364/708, 364/709.11
• US Class Current: 708/138
• CPC Class Codes: G06F 3/0221 Arrangements for reducing keyboard size for transport or storage, e.g. foldable keyboards, keyboards with collapsible keys G06F3/0216 takes precedence; for keyboards integrated in a laptop computer G06F1/1666
• CPC Class Codes: G06F 3/0231 Cordless keyboards
• 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 13/703 characterised by spacers between contact carrying layers
• CPC Class Codes: H01H 2203/002 Raised edge
• CPC Class Codes: H01H 2207/002 Conductive rubber; Zebra
• CPC Class Codes: H01H 2207/022 Plug
• CPC Class Codes: H01H 2207/048 Inductive or infrared coupling
• CPC Class Codes: H01H 2209/03 elastomeric
• CPC Class Codes: H01H 2209/052 elastomeric
• CPC Class Codes: H01H 2209/074 elastomeric
• CPC Class Codes: H01H 2213/002 with external pressure
• CPC Class Codes: H01H 2215/028 alterable
• CPC Class Codes: H01H 2217/006 Different feeling for different switch sites
• CPC Class Codes: H01H 2223/052 reductible in size, e.g. for transportation
• CPC Class Codes: H01H 2229/034 Positioning of layers
• CPC Class Codes: H01H 2229/042 Snap coupling; Snap mounting
• CPC Class Codes: H01H 2239/01 combined with other elements on the same substrate
• CPC Class Codes: H01H 2239/058 Containing a battery

Abstract

A keyboard for a computer molded from a flexible material, and rollable into a cylinder for transport and storage. In a particular embodiment, the keyboard is assembled in two layers, one having molded dome structures for key, and the other sensors and flexible traces for converting keystrokes to electrical signals.

Claims

1. A keyboard for a computer, comprising:

a first layer of contiguous flexible material having a plurality of flexible key means formed therein, for converting finger motion into keystrokes;

a second layer of contiguous flexible material having a plurality of sensing means for creating electrical signals in response to said keystrokes;

flexible electrical conductor means contacting said plurality of sensing means, for communicating said electrical signals away from each of said sensing means; and

communication means for communicating information relative to said electrical signals away from said flexible keyboard;

said keyboard rollable into a cylinder of spiral aspect for storage.

2. A keyboard as in claim 1 wherein said communication means comprises a microprocessor-based keyboard controller carried within said flexible keyboard and in contact with said flexible electrical conductor means, and a cable for connecting to an associated computer, said controller for creating coded signals based on said electrical signals, and said cable for bringing power from said computer and carrying said coded signals to said computer.

3. A keyboard for a computer, comprising:

a first contiguous flexible layer comprising a plurality of flexible key means formed therein for converting finger motion into keystrokes;

a second contiguous flexible layer proximate said first contiguous flexible layer comprising a plurality of sensing means for converting said keystrokes to electrical signals;

electrical conductor means for communicating said electrical signals away from said sensing means;

joining means for fastening said first and second flexible layers together in a manner allowing relative motion between said first and said second contiguous flexible layers when rolled; and

communication means for communicating information relative to said electrical signals away from said flexible keyboard;

said keyboard rollable into a cylinder of spiral aspect for storage.

4. A keyboard as in claim 3 wherein said communication means comprises a microprocessor-based keyboard controller carried within said flexible keyboard and in contact with said flexible electrical conductor means, and a cable for carrying said coded signals to an associated computer, said controller for creating coded signals based on said electrical signals, and said cable for bringing power from said computer and carrying said coded signals to said computer.

5. A keyboard as in claim 3 wherein each of said key means comprises:

a molded dome shape in said first contiguous flexible layer, configured to collapse under pressure from a user'"'"'s finger motion and to return to its original shape upon release of said finger pressure, said collapse and return being a single keystroke; and

an electrically conductive area under said dome shape.

6. A keyboard as in claim 5 wherein said sensing means comprises:

a surface facing said electrically conductive area under said dome shape;

a first electrically conductive region on said surface;

a first electrically conductive trace contacting and leading away from said first electrically conductive region;

a second electrically conductive region on said surface, spaced apart from said first electrical conductive region; and

a second electrically conductive trace contacting and leading away from said second electrically conductive region;

wherein collapse of said dome brings said conductive area under said dome into contact with said surface, establishing electrical contact between said first trace and said second trace.

7. A keyboard as in claim 3 wherein said joining means comprises extensions of flexible material from one of said layers entering and being retained in openings in the other of said layers to permit said layers to move relative to one another by stretching said extensions of flexible material during rolling of the two connected layers into said cylinder of spiral aspect for storage.

8. A keyboard as in claim 4 wherein each of said layers define retaining pockets formed as matching depressions to receive said keyboard controller.

9. A keyboard as in claim 3 comprising:

a battery for power; and

wherein said communication means comprises a coil driven by electrical current supplied by said battery to produce a magnetic field; and

wherein said keyboard controller converts keystrokes and keystroke combinations to encoded signals transmitted as changes in flux in said magnetic field.

10. A computer system comprising:

CPU means for performing logic and computations;

bus data transmission means connected to said CPU means for transmitting data;

electronic storage means connected to said bus data transmission means for storing data and programs; and

a keyboard comprising;

a first contiguous flexible layer comprising a plurality of flexible key means formed therein for converting finger motion into keystrokes;

a second contiguous flexible layer proximate said first contiguous flexible layer comprising a plurality of sensing means for converting said keystrokes to electrical signals;

electrical conductor means for communicating said electrical signals away from said sensing means;

joining means for fastening said first and second flexible layers together in a manner allowing relative motion between said first and said second contiguous flexible layers when rolled; and

communication means for communicating information relative to said electrical signals away from said flexible keyboard;

said keyboard rollable into a cylinder of spiral aspect for storage.

11. A computer system as in claim 10 wherein said communication means comprises a microprocessor-based keyboard controller carried within said flexible keyboard and in contact with said flexible electrical conductor means, and a cable for carrying said coded signals from said flexible keyboard, said controller for creating coded signals based on said electrical signals, and said cable for bringing power to said flexible keyboard and for carrying said coded signals away from said flexible keyboard.

12. A computer system as in claim 10 wherein said keyboard further comprises a battery for power, said communication means comprises a coil driven by electrical current supplied by said battery to produce a magnetic field, and said keyboard controller converts keystrokes and keystroke combinations to encoded signals transmitted as changes in flux in said magnetic field.