Unitary key panel

• US 4,644,326 A
• Filed: 06/03/1983
• Issued: 02/17/1987
• Est. Priority Date: 06/03/1983
• Status: Expired due to Term

• Current Assignee: Hirsch Electronics Corporation
• Original Assignee: Secure Keyboards Limited
• Inventors: Hirsch, Steven B., Hauser, Steven G., Von Buelow, John, Villalobos, Luis
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/500,862
• Time in Patent Office: 1,355 Days
• Field of Search: 340/365 R, 340/365 E, 340/365 VL, 340/712, 340/568, 200/5 A, 200/61.93, 200/159 B, 200/302.2, 200/302.1
• US Class Current: 341/34
• CPC Class Codes: G07F 7/1041 PIN input keyboard gets new key allocation at each use
• 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 13/785 characterised by the material of the contacts, e.g. conductive polymers
• CPC Class Codes: H01H 2201/018 transparent
• CPC Class Codes: H01H 2201/028 Indium tin oxide [ITO]
• CPC Class Codes: H01H 2209/006 Force isolators
• CPC Class Codes: H01H 2209/03 elastomeric
• CPC Class Codes: H01H 2209/038 transparent
• CPC Class Codes: H01H 2209/052 elastomeric
• CPC Class Codes: H01H 2209/06 transparent
• CPC Class Codes: H01H 2209/074 elastomeric
• CPC Class Codes: H01H 2209/082 transparent
• CPC Class Codes: H01H 2217/008 Pretravel to avoid inadvertent switching
• CPC Class Codes: H01H 2219/016 programmable
• CPC Class Codes: H01H 2219/036 Light emitting elements
• CPC Class Codes: H01H 2219/058 Optical grid, collimator or microlouver
• CPC Class Codes: H01H 2221/002 integral with membrane
• CPC Class Codes: H01H 2221/05 Force concentrator; Actuating dimple
• CPC Class Codes: H01H 2223/002 sealed
• CPC Class Codes: H01H 2223/034 : Bezel
• CPC Class Codes: H01H 2227/00 : Dimensions; Characteristics
• CPC Class Codes: H01H 2229/034 : Positioning of layers
• CPC Class Codes: H01H 2231/006 : Bank automat; Cash register; Vending machine
• CPC Class Codes: H01H 2239/016 : combined with start switch, discrete keyboard
• CPC Class Codes: H01H 2239/032 : Anti-tamper
• CPC Class Codes: H01H 2239/034 : Environmental protection
• CPC Class Codes: H01H 2239/038 : Anti-vandalism

Abstract

An environmentally protected keyboard display and input device is provided which may be utilized in conjunction with a variety of digital control systems such as automated bank tellers or building security systems. The keyboard display and input device includes a unitary, transparent flexible keyboard having thickened portions forming keys. The keyboard forms an environmental seal including a peripheral gasket to protect an underlying, transparent, pressure sensitive switching assembly, which, in turn, overlies a corresponding visual display of alphanumeric characters which indicate the significance of the individual pressure sensitive switches and corresponding keys overlying each character. Pins are formed on the underside of the flexible keyboard, below each key, to focus and concentrate pressure exerted on each key to the corresponding pressure sensitive switch below. An optical grid is provided to restrict the viewing of the alphanumeric characters to the user of the device, to prevent compromising the data input.

Claims

1. An environmentally protected secure keyboard display and input device, comprising:

means for providing a variable visual display of alphanumeric characters in an array;

means for restricting the view of said display means to the user of said device;

means for inputting data including a plurality of input actuation sites overlying said display means;

unitary flexible keyboard means having rows and columns of keys for separately and independently activating each of said actuation sites, said keyboard means being formed of transparent flexible material and including a peripheral environmental seal and thickened portions forming input keys overlying each of said actuation sites, said unitary keyboard means having its central area including the spaces between keys being open and free of overlying members including said thickened portions, said unitary keyboard being formed of a material having a hardness of in the order of substantially 80 on the Shore round tool "A" scale to have high impact and abuse resistance and some limited flexibility;

said unitary keyboard means being continuous in the central area including the rows and colums of keys; and

means including an exterior frame or bezel means for clamping the entire peripheral edges of said keyboard means to underlying portions of said assembly to form a waterproof gasket completely sealing said keyboard means around the entire periphery thereof.

2. The display and input device of claim 1, wherein said keyboard means is formed of transparent urethane.

3. The display and input device of claim 1, wherein said means for inputting data comprises an array of pressure sensitive switches, each of said switches formed of two or more layers of transparent electrical conducting material, said layers being disposed adjacent to but slightly separated from one another, wherein pressure exerted upon said layers will distort said layers into electrically conducting contact.

4. The keyboard display and input device of claim 3, wherein said transparent electrical conducting material includes indium oxide.

5. The display and input device of claim 3, wherein said transparent electrical material conducting material includes tin oxide.

6. The keyboard display and input device of claim 3, wherein said keyboard means includes one or more pin members disposed beneath each of said keys, said pin members serving to focus and concentrate deforming pressure upon said pressure sensitive switches in response to pressure exerted upon said keys by a user of said device.

7. The display and input device of claim 6, wherein said keyboard means is formed of transparent urethane.

8. The display and input device of claim 1, wherein said means for visually displaying alphanumeric characters is an array of light emitting diodes.

9. An environmentally protected secure keyboard display and input device, comprising:

means for providing a variable visual display of alphanumeric characters in an array;

means for restricting the view of said display means to the user of said device;

means for inputting data including a plurality of input actuation sites overlying said display means;

unitary flexible keyboard means for separately and independently activating each of said actuation sites, said keyboard means being formed of transparent flexible material and including a peripheral environmental seal and thickened portions forming input keys overlying each of said actuation sites; and

anti-tampering means for turning said device off in response to partial disassembly of said device.

10. The display and input device of claim 9, wherein said antitampering means comprises:

a pressure sensitive shut off switch; and

an extending finger biased to engage and activate said pressure sensitive shut off switch in response to partial disassembly of said device.

11. In a secure keyboard display and input device, including a plurality of input actuation sites and corresponding character displays, the improvement comprising:

means for protecting said device from external environmental damage or interference while allowing external actuation of said input actuation sites by an operator of said device, said means for protecting comprising a unitary flexible keyboard having rows and columns of keys sealingly mounted upon said actuation sites;

said unitary keyboard means having its central area including the spaces between keys being open and free of any overlying members, said unitary keyboard being formed of a material having a hardness of in the order of substantially 80 on the Shore round tool "A" scale to have high impact and abuse resistance and some limited flexibility;

said unitary keyboard means being continuous in the central area including the rows and columns of keys;

means including an exterior frame or bezel means for clamping the entire peripheral edges of said keyboard to underlying portions of said device to form a waterproof gasket completely sealing said keyboard around the entire periphery thereof.

12. The display and input device of claim 11, wherein said unitary flexible keyboard includes thickened portions forming input keys overlying each of said actuation locations.

13. The display and input device of claim 11, wherein said unitary flexible keyboard is formed of urethane.

15. The display and input device of claim 13, wherein said urethane keyboard is transparent.

14. In a secure keyboard display and input device, including a plurality of input actuation sites and corresponding character displays, the improvement comprising:

means for protecting said device from external environmental damage or interference while allowing external actuation of said input actuation sites by an operator of said device, said means for protecting comprising a unitary flexible keyboard sealingly mounted upon said actuation sites; and

anti-tampering means for turning said device off in response to partial disassembly of said device.

16. The display and input device of claim 14, wherein said antitampering means comprises:

a shut off switch disposed adjacent to said input actuation locations; and

a pivoting member biased to engage and activate said switch when said frame is removed from said device.