User navigation device with a code wheel and an encoder

• US 7,732,756 B2
• Filed: 11/01/2006
• Issued: 06/08/2010
• Est. Priority Date: 11/01/2006
• Status: Expired due to Fees

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Lum, Chee Foo, Foo, Siang Leong, Wong, Weng Fei
• Primary Examiner(s): Epps, Georgia Y
• Assistant Examiner(s): Ko, Tony
• Application Number:
  US11/591,799
• Publication Number:
  US 20080100569A1
• Time in Patent Office: 1,315 Days
• Field of Search: 25023113-23118, 345/156, 345/157, 345/161, 345/163, 345/184, 341 20- 22, 400/489
• US Class Current: 250/231.18
• CPC Class Codes: G01D 5/3473 Circular or rotary encoders

Abstract

A user navigational apparatus. The user navigational apparatus includes a code wheel and an encoder. The code wheel is coupled to a dial. The code wheel includes a track of alternating reflective and non-reflective sections. The optical reflective encoder includes an emitter and a detector. The emitter generates a light signal incident on the track of the code wheel. The detector detects a reflected light signal. The reflected light signal corresponds to a portion of the incident light signal that is reflected off of the reflective sections of the track. The detector also generates a channel signal corresponding to the reflected light signal. Embodiments of this type of user navigational apparatus achieve reduced thickness compared to conventional implementations of jog wheels.

Claims

1. A user navigational apparatus comprising:

a dial;

a code wheel coupled to the dial, wherein the code wheel comprises a track of alternating reflective and non-reflective sections located within a plane of the code wheel;

an encoder comprising an emitter and a detector, the emitter configured to generate a light signal incident on the track of the code wheel, the detector configured to detect a reflected light signal reflected off of the reflective sections of the track and to generate a channel signal corresponding to the reflected light signal;

a switch coupled to the dial, the switch to generate a first button click operation in response to depression of only a portion of the dial;

a dome switch operationally coupled to an independent button; and

an illumination ring approximately surrounding the independent button, wherein the dial circumscribes the illumination ring and the independent button.

2. The user navigational apparatus of claim 1 further comprising:

a decoder coupled to the encoder, the decoder to generate a count signal corresponding to the channel signal; and

a microprocessor coupled to the decoder, the microprocessor to implement a user navigational operation on a controlled device in response to a movement of the dial by a user.

3. The user navigational apparatus of claim 2 wherein:

the independent button is coupled to the microprocessor,

wherein the microprocessor is configured to implement a second button click operation;

wherein the user navigational operation comprises a scrolling operation corresponding to a turn of the dial, the first button click operation corresponding to the depression of only the portion of the dial, or a second button click operation corresponding to a depression of the independent button; and

wherein the scrolling operation manipulates content on the controlled device.

4. The user navigational apparatus of claim 3 wherein the microprocessor is further configured to generate a signal to implement a directional selection or an item selection on the controlled device in response to the depression of the dial or the depression of the independent button.

5. The user navigational apparatus of claim 1 further comprising:

a back plate;

a circuit substrate coupled to the back plate, wherein the encoder is coupled to the circuit substrate; and

a mounting bracket coupled to the back plate, wherein the code wheel, the dial, the independent button, and the illumination ring are mounted to the mounting bracket.

6. The user navigational apparatus of claim 1 wherein the detector comprises:

a photodiode to detect the reflected light signal reflected off of the reflective sections of the track; and

signal processing circuitry coupled to the photodiode, the signal processing circuitry to generate the channel signal corresponding to the reflected light signal.

7. The user navigational apparatus of claim 6 further comprising an air gap between the code wheel and the emitter and between the code wheel and the detector, wherein the emitter and the detector are not encapsulated by an encapsulant.

8. The user navigational apparatus of claim 6 further comprising an encapsulant to jointly encapsulate the emitter and the detector.

9. The user navigational apparatus of claim 6 further comprising:

a first encapsulant to encapsulate the emitter; and

a second encapsulant to encapsulate the detector.

10. The user navigational apparatus of claim 6 further comprising:

a first encapsulant to encapsulate the emitter; and

a second encapsulant to encapsulate a wire bond of the detector, wherein the second encapsulant does not encapsulate the photodiode.

11. The user navigational apparatus of claim 1 wherein the encoder comprises an incremental, multi-turn, multi-channel, rotary encoder.

12. The user navigational apparatus of claim 1 wherein the encoder comprises a chip-on-board emitter and detector or a discrete transfer molded emitter-detector package.

13. The user navigational apparatus of claim 1 further comprising a switch coupled to the dial, the switch to generate a first button click operation in response to depression of only a portion of the dial.

14. The user navigational apparatus of claim 1 wherein the code wheel is a flat ring.

15. The user navigational apparatus of claim 1 wherein the track of alternating reflective and non-reflective sections is arranged in a spiral bar pattern.

16. A user navigational apparatus comprising:

a rotary dial;

a dome switch operationally coupled to an independent button;

an illumination ring approximately surrounding the independent button, wherein the rotary dial circumscribes the illumination ring and the independent button;

means for generating a light signal incident on a coded track, wherein the coded track comprises alternating reflective and non-reflective sections located within a plane of the code wheel; and

means for detecting motion of the coded track, wherein the coded track is configured to move in response to a user movement of the rotary dial, wherein the user movement comprises depressing only a portion of the rotary dial to activate a first button clicking operation.

17. The user navigational apparatus of claim 16 further comprising means for implementing a user navigational operation on a controlled device in response to the user movement of the rotary dial.

18. The user navigational apparatus of claim 16 further comprising means for encapsulating at least a portion of an encoder mounted in conjunction with the coded track.

19. The user navigational apparatus of claim 16 further comprising means for activating a switch in response to the detected motion of the coded track or a detected motion of the independent button.

20. A method for making a user navigational apparatus, the method comprising:

coupling a code wheel to a rotary dial, wherein the code wheel comprises a track of alternating reflective and non-reflective sections located within a plane of the code wheel;

mounting an emitter on a circuit substrate relative to the code wheel, the emitter to generate a light signal incident on the track of the code wheel;

mounting a detector on the circuit substrate relative to the code wheel, the detector to detect a reflected light signal reflected off of the reflective sections of the track and to generate a channel signal corresponding to the reflected light signal;

mounting a dome switch operationally coupled to an independent button; and

mounting an illumination ring approximately surrounding the independent button, wherein the rotary dial circumscribes the illumination ring and the independent button.

21. The method of claim 20 further comprising:

coupling the detector to a decoder to generate a count signal corresponding to the channel signal; and

coupling the decoder to a microprocessor to implement a user navigational operation on a controlled device in response to a movement of the rotary dial by a user.

22. The method of claim 20 further comprising encapsulating at least a portion of an encoder mounted in conjunction with the coded track.