Variable-conductance sensor with elastomeric dome-cap

• US 6,135,886 A
• Filed: 07/24/1998
• Issued: 10/24/2000
• Est. Priority Date: 10/01/1997
• Status: Expired due to Term

• Current Assignee: Anascape, Ltd.
• Original Assignee: Anascape, Ltd.
• Inventors: Armstrong, Brad A.
• Primary Examiner(s): Martin-Wallace, Valencia
• Assistant Examiner(s): PARADISO, JOHN ROGER
• Application Number:
  US09/122,269
• Time in Patent Office: 823 Days
• Field of Search: 338/114, 463/36, 463/37, 273/148 B, 345/156
• US Class Current: 463/37
• CPC Class Codes: A63F 13/214 for locating contacts on a surface, e.g. floor mats or touch pads
• CPC Class Codes: A63F 2300/1056 involving pressure sensitive buttons
• CPC Class Codes: G06F 2200/1612 Flat panel monitor
• CPC Class Codes: G06F 3/0338 with detection of limited linear or angular displacement of an operating part of the device from a neutral position, e.g. isotonic or isometric joysticks
• CPC Class Codes: G06F 3/04847 Interaction techniques to control parameter settings, e.g. interaction with sliders or dials
• CPC Class Codes: G06F 3/0485 Scrolling or panning
• CPC Class Codes: H01H 13/70 having a plurality of operating members associated with different sets of contacts, e.g. keyboard mounting together a plurality of independent switches H02B
• 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 2201/036 Variable resistance
• CPC Class Codes: H01H 2215/004 Collapsible dome or bubble
• CPC Class Codes: H01H 2215/006 Only mechanical function
• CPC Class Codes: H01H 2229/046 Multi-colour or double shot injection moulding
• CPC Class Codes: H01H 2229/047 Preformed layer in mould
• CPC Class Codes: H01H 2231/008 Video game
• CPC Class Codes: H01H 2237/002 Bell crank

Abstract

Improved methods for using a dome-cap sensor wherein an injection molded dome-cap is combined with an analog active element which is positioned to contact conductive elements of an electronic circuit. The dome-cap is variably depressible for transferring force of varying intensity into the active element to provide variable conductivity connecting the proximal conductive elements. The electronic circuit reads the active element as being in any one of at least three or more readable states dependent upon amount of pressure applied to the active element. Relief of depressive force allows the dome-cap to return to a raised position and one which can indicate the sensor as electrically deactivated. Also disclosed is an improved analog sensing circuit including a user manipulable variable-conductance sensor, the improvement including the variable-conductance sensor being an injection molded dome-cap with an analog material and variably depressible to variably compress the material; the analog material, at least when compressed, is contacting two proximal circuit elements, wherein the degree of compression determines the degree of conductivity between the two proximal circuits.

Claims

1. An improved method for using an elastomeric injection molded dome-cap sensor of the type wherein an elastomeric injection molded dome-cap carries an active element which is positioned over a portion of an electronic circuit, said elastomeric injection molded dome-cap depressible for transferring force into said active element, said active element when under force electrically contacting conductive elements of said electronic circuit, said electronic circuit structured for reading the active element as being in any one of a plurality of states;

wherein the improvement comprises the steps of;

a) depressing variably said elastomeric injection molded dome-cap;

b) reading said active element as being in any one of at least three readable states;

c) storing, as digital information, a read state of said active element, said storing as digital information requiring at least two digital bits.

2. An improved method for reading an elastomeric injection molded dome-cap sensor of the type wherein an active element is positioned within an elastomeric injection molded dome-cap which is positioned over a portion of an electronic circuit, said elastomeric injection molded dome-cap depressible for transferring force into said active element, said active element when under force electrically contacting conductive elements of said electronic circuit, said electronic circuit structured for reading said active element as being in any one of two readable states;

wherein the improvement comprises the step;

structuring said electronic circuitry for reading said active element as being in any one of at least three readable states.

3. An improved method for storing a read state of an elastomeric injection molded dome-cap sensor of the type wherein an active element is positioned within an elastomeric injection molded dome-cap which is positioned over a portion of an electronic circuit, said elastomeric injection molded dome-cap depressible for transferring force into said active element, said active element when under force electrically contacting conductive elements of said electronic circuit, said electronic circuit structured for reading the active element as being in any one of a plurality of states, and storing a read state as digital information, said storing of the read state requiring one digital bit;

wherein the improvement comprises the step;

storing, as digital information, a read state of said active element, said storing of the read state requiring at least two digital bits.

4. An improved method for storing a read state of an elastomeric injection molded dome-cap sensor in accordance with claim 3 wherein said storing requires at least four digital bits.

5. An improved method for storing a read state of an elastomeric injection molded dome-cap sensor in accordance with claim 3 wherein said storing requires at least eight digital bits.

6. An improved method of depressing an elastomeric injection molded dome-cap sensor of the sensor type wherein an active element is positioned within an elastomeric injection molded dome-cap which is positioned over a portion of an electronic circuit, said elastomeric injection molded dome-cap depressible for transferring force into said active element, said active element when under force electrically contacting conductive elements of said electronic circuit, said electronic circuit structured for outputting information representing states of said active element;

wherein the improvement comprises the step of;

depressing said elastomeric injection molded dome-cap sensor with varying force causing said electronic circuit to output information representing at least three states representative of the varying force.

7. An improved analog sensing circuit of the type including a user manipulable variable-conductance sensor and circuitry for reading said sensor;

wherein the improvement comprises;

the variable-conductance sensor is an elastomeric injection molded dome-cap positioned over a pressure-sensitive variable-conductance material.

8. An improved analog sensing circuit in accordance with claim 7 wherein said pressure-sensitive variable-conductance material is positioned within said injection molded dome-cap.

9. An improved analog sensing circuit in accordance with claim 8 wherein said injection molded dome-cap carries said pressure-sensitive variable-conductance material.

10. An improved analog sensing circuit in accordance with claim 9 wherein said injection molded dome-cap is made primarily of thermoset rubber.

11. An improved analog sensing circuit in accordance with claim 10 wherein said injection molded dome-cap produces a user discernable tactile feedback upon depressive pressure being applied to said injection molded dome-cap.

12. An improved electrical circuit of the type having circuitry for reading states of an active element within an elastomeric injection molded dome-cap;

wherein the improvement comprises;

the electrical circuit structured for reading any one of at least three readable states of said active element.

13. An improved electrical circuit in accordance with claim 12 wherein said electrical circuit includes analog to digital conversion circuitry means for converting said states of said active element into digital information.

14. An improved electrical circuit in accordance with claim 13 wherein said active element is carried by said injection molded dome-cap.

15. An improved electrical circuit in accordance with claim 14 wherein said injection molded dome-cap is made primarily of thermoset rubber.

16. An improved electrical circuit in accordance with claim 15 wherein said injection molded dome-cap produces a user discernable tactile feedback upon depressive pressure being applied to said injection molded dome-cap.

17. An improved electrical circuit in accordance with claim 15 with said circuit structured for reading any one of at least nine readable states of said elastomeric injection molded dome-cap sensor.

18. An improved electrical circuit in accordance with claim 15 with said circuit structured for reading any one of at least one-hundred twenty-nine readable states of said elastomeric injection molded dome-cap sensor.

19. An improved method for outputting a read state of an elastomeric injection molded dome-cap sensor of the type wherein an active element is positioned within an elastomeric injection molded dome-cap which is positioned over a portion of an electronic circuit, said elastomeric injection molded dome-cap depressible for transferring force into said active element, said active element when under force electrically contacting conductive elements of said electronic circuit, said electronic circuit structured for reading said active element as being in any one of a plurality of readable states, and outputting a read state as digital information, said outputting requiring at least one digital bit;

wherein the improvement comprises;

outputting from electronic circuitry, as digital information, a read state of said active element, said outputting of said read state requiring at least two digital bits.