Digital displacement encoding system and method

• US 6,429,792 B1
• Filed: 11/02/1998
• Issued: 08/06/2002
• Est. Priority Date: 11/02/1998
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: Burton, David L.
• Primary Examiner(s): Edwards, Jr., Timothy
• Application Number:
  US09/184,628
• Time in Patent Office: 1,373 Days
• Field of Search: 341/22, 341/34, 200/5.A, 200/5.R, 200/6.A, 200/329, 200/335, 200/339
• US Class Current: 341/22
• CPC Class Codes: G06F 3/0362 with detection of 1D translations or rotations of an operating part of the device, e.g. scroll wheels, sliders, knobs, rollers or belts
• CPC Class Codes: H01H 1/029 comprising conducting material dispersed in an elastic support or binding material
• CPC Class Codes: H01H 2239/012 Decoding impedances
• CPC Class Codes: H03M 1/245 Constructional details of parts relevant to the encoding mechanism, e.g. pattern carriers, pattern sensors
• CPC Class Codes: H03M 1/28 with non-weighted coding
• CPC Class Codes: H03M 11/24 using analogue means , e.g. by coding the states of multiple switches into a single multi-level analogue signal or by indicating the type of a device using the voltage level at a specific tap of a resistive divider

Abstract

A digital displacement encoder that includes a mechanical actuator constructed and arranged to be displaced to one of a null and a plurality of activation positions in response to an externally-provided force. Also included is a conductive member constructed and arranged to be positioned to one of a plurality of intermediate positions in response to the change in position of the mechanical actuator. A contact array comprising a plurality of activation signal contacts is fixedly disposed proximate to the conductive member. Also included is a digital signal generator comprising one or more electrical circuits electrically coupled to the plurality of activation signal contacts, and one more terminals at which output signals are provided. The conductive member electrically contacts a predetermined one or more of the plurality of activation signal contacts when the mechanical actuator is in each of the plurality of positions. At each of the intermediate positions, the conductive member electrically alters the electrical circuits that include the contacted signal contacts to cause a change in output signals. Preferably, the conductive member is comprised of a conductive elastomeric material. Also, it is preferable that a biasing element be included to urge the conductive member toward its null position. The digital signal generator is a voltage pull-up circuit, although any type of circuit may be used. In one embodiment, the digital signal generator provides a plurality of output signals having a nominal state responsive to the mechanical actuator being in the null position, and a plurality of activation states each responsive to the mechanical actuator being in one of the plurality of activation positions. Preferably, the signal contacts are traces on the printed circuit board. The mechanical actuator may be a rocker button, wheel or slide, among others.

Claims

1. A digital displacement encoder comprising:

a mechanical actuator constructed and arranged to be displaced, with a single type of motion, to one of a null position or a plurality of activation positions in response to an externally-provided force;

a conductive member constructed and arranged to be positioned to one of a plurality of intermediate positions in response to said displacement of said mechanical actuator;

a contact array, comprising a plurality of activation signal contacts arranged in a substantially planar orientation, fixedly disposed proximate to said conductive member; and

a digital signal generator comprising one or more electrical circuits electrically coupled to said plurality of activation signal contacts, and one more terminals at which output signals are provided by said one or more electrical circuits,

wherein said conductive member electrically contacts a predetermined one or more of said plurality of activation signal contacts when said mechanical actuator is in each of said plurality of positions to electrically alter those of said one or more electrical circuits which are electrically coupled to said contacted activation signal contacts to cause a change in said output signals.

2. The digital displacement encoder of claim 1, wherein said digital signal generator is a voltage pull-up circuit.

3. The digital displacement encoder of claim 1, wherein said mechanical actuator comprises a rocker button.

4. The digital displacement encoder of claim 1, wherein said mechanical actuator comprises a wheel.

5. The digital displacement encoder of claim 1, wherein said mechanical actuator comprises a slide.

6. The digital displacement encoder of claim 1, wherein said conductive member is comprised of a conductive elastomeric material.

7. The digital displacement encoder of claim 6, wherein said signal contacts comprise traces on a printed circuit board.

8. The digital displacement encoder of claim 1, wherein each of said plurality of output signals has a nominal state responsive to said mechanical actuator being in a null position and having an activation state responsive to said mechanical actuator being in one of a plurality of activation positions.

9. The digital displacement encoder of claim 3, wherein said conductive member is electrically connected to an activation reference voltage corresponding to an activation state of said output signals.

10. The digital displacement encoder of claim 9, wherein said activation reference voltage is ground.

11. The digital displacement encoder of claim 10, further comprising:

a biasing element configured to urge said mechanical activator toward said null position.

12. A digital displacement encoder comprising:

a signal generator circuit comprising a plurality of output terminals and a plurality of activation signal contacts arranged in a substantially planar orientation each fixedly connected to a base and electrically connected to at least one of said output terminals; and

a mechanical actuator movably disposed with respect to said base to be located at one of a plurality of positions in response to a user-supplied motion of a single type displacement of said mechanical actuator, said actuator comprising a conductive member configured to be located at a null position and a plurality of activation positions, said conductive member disposed away from each of said plurality of activation signal contacts while in said null position and contacting one or more of said activation signal contacts while in each of said plurality of activation positions,

wherein said conductive member causes said signal generator circuit to generate one or more digital output signals at said at least one output terminal, each said plurality of digital output signals having a first state associated with said null position and a second state associated with said activation position.

13. The digital displacement encoder of claim 12, wherein said digital signal generator is a voltage pull-up circuit.

14. The digital displacement encoder of claim 12, wherein the base is a printed circuit board and further wherein said signal contacts comprise traces on said printed circuit board.

15. The digital displacement encoder of claim 12, wherein said mechanical actuator comprises a rocker button.

16. The digital displacement encoder of claim 12, wherein said mechanical actuator comprises a wheel.

17. The digital displacement encoder of claim 12, wherein said conductive member comprises a conductive elastomeric material.

18. The digital displacement encoder of claim 12, further comprising:

a biasing element configured to urge said mechanical actuator toward said null position.

19. A digital displacement encoder comprising:

a mechanical actuator;

a contact array, comprising a plurality of activation signal contacts arranged in a substantially planar orientation;

a conductive member, in communication with the mechanical actuator, that responsive to said displacement of said mechanical actuator contacts the plurality of activation signal contacts in a predetermined sequence, the progression of the sequence being determined by the direction and displacement of the mechanical actuator; and

a digital signal generator, electrically coupled to said plurality of activation signal contacts, that outputs a digital signal related to the direction and amount of displacement of the mechanical actuator.

20. A digital displacement encoder comprising:

a mechanical actuator that moves in an analog manner;

a contact array, comprising a plurality of activation signal contacts arranged in a substantially planar orientation;

a conductive member, in communication with the mechanical actuator, that responsive to said displacement of said mechanical actuator contacts the a subset of the plurality of activation signal contacts based the direction and amount of displacement of the mechanical actuator; and

a digital signal generator, electrically coupled to said plurality of activation signal contacts, that outputs an increasing and decreasing digital signal value related to the direction and amount of displacement of the mechanical actuator.