Control and Data Entry Apparatus

• US 20090057124A1
• Filed: 10/25/2007
• Published: 03/05/2009
• Est. Priority Date: 08/27/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Sahabi, Azin, Orsley, Timothy James
• Granted Patent: US 8,232,963 B2
• Time in Patent Office: Days
• US Class Current: 200/600
• 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: H01H 2003/0293 with an integrated touch switch
• CPC Class Codes: H01H 2025/048 having a separate central push, slide or tumbler button which is not integral with the operating part that surrounds it
• CPC Class Codes: H01H 2225/002 superimposed
• CPC Class Codes: H01H 2225/03 Different type of switches
• CPC Class Codes: H01H 2239/006 Containing a capacitive switch or usable as such
• CPC Class Codes: H01H 25/041 having a generally flat operating member depressible at different locations to operate different controls
• CPC Class Codes: H03K 17/975 using a capacitive movable element

Abstract

A control and data entry device adapted for use in for electronic devices such as portable computers, PDA'"'"'s, cell phones, MP3 players and the like. The control and data entry device includes a tiltable member or similar structure carrying an electrically conductive member spaced from multiple sense electrodes disposed on a circuit substrate. In one embodiment, capacitances between the electrically conductive member and the electrodes are measured to provide information concerning the tiltable member'"'"'s orientation relative to the sense electrodes. The tiltable member may be manipulated by a users finger to tilt such member slightly and thereby effect scrolling functionality, thereby simulating the operation of circular capacitive touch pads known in the art. Switches may also be included, responsive to greater tilting of the tiltable member, thereby to effect clicking functionality. In some embodiments, a rotatable knob may be used to effect scrolling functionality.

Claims

1. A mutual capacitance control and data entry apparatus, comprising:

a tiltable member configured for tilting by a user or a mechanism;

an electrically conductive member attached to the tiltable member;

a substrate spaced apart from the electrically conductive member by a gap and having a plurality of mutually isolated electrically conductive sense electrodes disposed thereon;

a drive signal circuit configured to provide an electrical drive signal to the electrically conductive member and operably connected thereto;

a capacitance measurement circuit operably coupled to the electrically conductive member and the sense electrodes, the circuit being configured to detect changes in capacitance occurring between the electrically conductive member and the sense electrodes when the tiltable member is tilted towards the sense electrodes, and

a plurality of switches, each such switch being operably connected to a corresponding one of the plurality of sense electrodes and being configured to connect such sense electrode to ground upon being actuated or closed by a user;

wherein tilting of the tiltable member by the user or the mechanism effects a first function in the device, and closing of one of the plurality of switches by the user effects a second function in the device.

2. The control and data entry apparatus of claim 1, wherein the first function is scrolling and the second function is clicking.

3. The control and data entry apparatus of claim 1, wherein the plurality of switches are dome switches.

4. The control and data entry apparatus of claim 1, further comprising a flexible membrane interposed between the tiltable member and the electrically conductive member.

5. The control and data entry apparatus of claim 1, wherein the plurality of sense electrodes provide output signals indicative of corresponding overlying navigation sectors located on or in the tiltable member that are tilted by the user or mechanism into proximity with the sense electrodes.

6. The control and data entry apparatus of claim 1, wherein the apparatus is configured to effect the first function when the tiltable member is tilted slightly and to effect the second function when the tiltable member is tilted deeply.

7. The control and data entry apparatus of claim 6, wherein tilted slightly corresponds to a first vertical displacement of the tiltable member ranging between about 0.25 mm and about 0.40 mm, between about 0.20 mm and about 0.45 mm and between about 0.15 mm and about 0.50 mm, and tilted deeply corresponds to a second vertical displacement of the tiltable member ranging between about 0.45 mm and about 0.65 mm, between about 0.40 mm and about 0.70 mm and between about 0.30 mm and about 0.80 mm.

8. The control and data entry apparatus of claim 1, wherein an outer periphery of the tiltable member is configured to tilt through a maximum vertical distance of about 0.10 mm, about 0.20 mm, about 0.30 mm, about 0.40 mm, about 0.50 mm, about 0.60 mm and about 0.70 mm, or to tilt through a vertical distance ranging between about between about 0.20 mm and about 0.40 mm, between about 0.10 mm and about 0.60 mm, and about 0.05 mm and about 0.80 mm.

9. The control and data entry apparatus of claim 1, wherein the electrically conductive member is substantially planar in shape and has a diameter approximating between about 10 mm and about 50 mm or at least one of about 12 mm, about 14 mm, about 16 mm, about 18 mm, about 20 mm, about 30 mm and about 40 mm.

10. The control and data entry apparatus of claim 1, wherein the apparatus is a 5-way keypad.

11. The control and data entry apparatus of claim 1, wherein the tiltable member comprises a generally circular shape forming an outer ring and the apparatus comprises a center button disposed within the outer ring, the outer ring having markings corresponding to cardinal directions superimposed thereon.

12. The control and data entry apparatus of claim 1, wherein the tiltable member and the apparatus are configured to control a position of a cursor, the cursor moving in a direction of tilt of the tiltable member, such movement being proportional to the degree of the tilt.

13. The control and data entry apparatus of claim 1, wherein the apparatus is configured such that substantially no path to ground is established by the user placing a finger on the apparatus.

14. The control and data entry apparatus of claim 1, further comprising a flexible membrane, the membrane being configured to impart at least one of leak-tightness, leak resistance, gas-tightness, gas resistance, vapor-tightness and vapor resistance to the device

15. The control and data entry apparatus of claim 1, wherein the capacitance measurement circuit is operably connected to a host processor.

16. The control and data entry apparatus of claim 1, wherein the apparatus is incorporated into and forms a portion of a mobile electronic device.

17. The control and data entry apparatus of claim 16, wherein the mobile electronic device is at least one of a laptop computer, personal data assistant (PDA), a mobile telephone, a cellular telephone, a radio, an MP3 player, and a portable music player.

18. The control and data entry apparatus of claim 1, wherein the apparatus is incorporated into and forms a portion of a stationary device, the stationary device being one of an exercise machine, an industrial control, a control panel, an outdoor control device, and a washing machine.

19. The control and data entry apparatus of claim 1, wherein at least one of the drive signal circuit and the capacitance measurement circuit is incorporated into an integrated circuit.

20. The control and data entry apparatus of claim 1, wherein the apparatus is configured to effect the first function when tilting of the tiltable member by the user does not exceed a predetermined vertical displacement of the electrically conductive member.

21. The control and data entry apparatus of claim 1, wherein the apparatus is configured to effect a third function when tilting of the tiltable member by the user exceeds a predetermined vertical displacement of the electrically conductive member.

22. A mutual capacitance control and data entry apparatus, comprising:

a rotatable knob mechanism configured for rotation by a user or a mechanism;

an electrically conductive member disposed substantially in a second plane and embedded within the rotatable knob mechanism;

a substrate disposed substantially in a second plane and spaced apart from the electrically conductive member, the substrate having a plurality of mutually isolated electrically conductive sense electrodes disposed thereon, the second plane being non-parallel and tilted in respect of the first plane, the electrically conductive member being positioned closest to the substrate at a tilted portion thereof;

a drive signal circuit configured to provide an electrical drive signal to the electrically conductive member and operably connected thereto, and

a capacitance measurement circuit operably coupled to the electrically conductive member and the sense electrodes;

wherein rotation of the rotatable knob mechanism by the user or the mechanism causes the tilted portion sequentially to come into proximity with the sense electrodes as the knob is rotated, the circuit being configured to detect changes in capacitance occurring between the electrically conductive member and the sense electrodes as the tilted portion sweeps across the sense electrodes, at least a first function being effected by the apparatus in response to the changes in capacitance being sensed by the capacitance measurement circuit.

23. A mutual capacitance control and data entry apparatus, comprising:

a rotatable knob mechanism configured for rotation by a user or a mechanism;

an electrically conductive member disposed substantially in a second plane and attached to a lower surface of the rotatable knob mechanism;

a substrate disposed substantially in a second plane and spaced apart from the electrically conductive member, the substrate having a plurality of mutually isolated electrically conductive sense electrodes disposed thereon, the second plane being non-parallel and tilted in respect of the first plane, the electrically conductive member being positioned closest to the substrate at a tilted portion thereof;

a drive signal circuit configured to provide an electrical drive signal to the electrically conductive member and operably connected thereto, and

a capacitance measurement circuit operably coupled to the electrically conductive member and the sense electrodes;

wherein rotation of the rotatable knob mechanism by the user or the mechanism causes the tilted portion sequentially to come into proximity with the sense electrodes as the knob is rotated, the circuit being configured to detect changes in capacitance occurring between the electrically conductive member and the sense electrodes as the tilted portion sweeps across the sense electrodes, at least a first function being effected by the apparatus in response to the changes in capacitance being sensed by the capacitance measurement circuit.

24. A Hall effect control and data entry apparatus, comprising:

a tiltable member configured for tilting by a user or a mechanism;

a plurality of magnets attached to, or disposed within or on, the tiltable member;

a substrate spaced apart from the plurality of magnets by a gap and having a plurality of Hall effect sensors disposed thereon, each Hall effect sensor being located beneath a corresponding magnet disposed thereabove;

a Hall effect sensing circuit or microcontroller operably coupled to each of the Hall effect sensors, the circuit or microcontroller and the Hall effect sensors being configured to detect changes in magnetism occurring between the Hall effect sensors and the magnets when the tiltable member is tilted towards the Hall effect sensors;

a keyboard controller, and

a plurality of switches disposed beneath the tiltable member and operably connected to the keyboard controller, each such switch being configured for closing by the tiltable member when the tiltable member is pressed downwardly thereupon;

wherein tilting of the tiltable member by the user or the mechanism effects a first function in the device, and closing of one of the plurality of switches by the user effects a second function in the device.

25. A method of making a mutual capacitance control and data entry apparatus, comprising:

providing a tiltable member configured for tilting by a user or a mechanism;

providing an electrically conductive member attached to the tiltable member;

providing a substrate spaced apart from the electrically conductive member by a gap and having a plurality of mutually isolated electrically conductive sense electrodes disposed thereon;

providing a drive signal circuit configured to provide an electrical drive signal to the electrically conductive member and operably connected thereto;

providing a capacitance measurement circuit operably coupled to the electrically conductive member and the sense electrodes, the circuit being configured to detect changes in capacitance occurring between the electrically conductive member and the sense electrodes when the tiltable member is tilted towards the sense electrodes, and

providing a plurality of switches, each such switch being operably connected to a corresponding one of the plurality of sense electrodes and being configured to connect such sense electrode to ground upon being actuated or closed by a user;

wherein the resulting apparatus is configured such that tilting of the tiltable member by the user or the mechanism such effects a first function in the device, and closing of one of the plurality of switches by the user effects a second function in the device.