TOUCH PAD STRUCTURE

• US 20090114518A1
• Filed: 11/01/2007
• Published: 05/07/2009
• Est. Priority Date: 11/01/2007
• Status: Active Grant

• Current Assignee: Touchscreen Gestures LLC
• Original Assignee: Sentelic Corporation
• Inventors: Lin, Jao-Ching, Liu, Yen-Fu, Shen, Chung-Yi, Chu, Lin-Abel
• Granted Patent: US 7,642,479 B2
• Time in Patent Office: Days
• US Class Current: 200/600
• CPC Class Codes: G06F 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: H01H 2219/044 Edge lighting of layer
• CPC Class Codes: H01H 2219/06 Reflector
• CPC Class Codes: H01H 2219/062 Light conductor
• CPC Class Codes: H03K 17/962 Capacitive touch switches
• CPC Class Codes: H03K 2017/9602 characterised by the type or shape of the sensing electrodes
• CPC Class Codes: H03K 2217/960755 Constructional details of capacitive touch and proximity switches
• CPC Class Codes: H03K 2217/960785 with illumination

Abstract

A touch pad includes a first substrate, a second substrate and a joining layer. The joining layer joins the first substrate and the second substrate together. The first substrate provides a refection layer at a lateral side or both sides thereof with at least a light emitting component being disposed at the periphery of said reflection layer. The second substrate provides an electrical circuit with a first conductor to connect with the light emitting component. The reflection layer is provided with a size less than said first substrate and has an upper side to adhere said first substrate so as to be fixed in said joining layer. the electrical circuit is capable of determining if the touch pad is touched with an object by means of receiving a change of coupling capacity of a sensing locus and capable of controlling luminosity of said light emitting component.

Claims

1. A touch pad comprising:

a first substrate providing a refection layer at a lateral side with at least a light emitting component being disposed at the periphery of said reflection layer;

a second substrate providing an electrical circuit with a first conductor to connect with said light emitting component such that said electrical circuit is capable of determining if said touch pad is touched with an object by means of receiving a change of coupling capacity of a sensing locus and capable of controlling luminosity of said light emitting component;

a joining layer joining said first substrate and said second substrate together;

wherein, said reflection layer is provided with a size less than said first substrate and has an upper side to adhere said first substrate so as to be fixed in said joining layer.

2. The touch pad as defined in claim 1, wherein said first substrate is capable of being added with color grains, fluorescent powder or luminous powder therein in association with light beam to enhance visual effect.

3. The touch pad as defined in claim 1, wherein said first substrate is capable of being added with color grains, fluorescent powder or luminous powder at the side provided with said reflection layer or said reflection layer is capable of being added with color grains, fluorescent powder or luminous powder thereon in association with light beam to enhance visual effect.

4. The touch pad as defined in claim 1, wherein knurling figure or reflection arrangement is provided on said touch pad such that a pattern or characters are presented by means of reflections of strong and weak lights.

5. The touch pad as defined in claim 1, wherein said light emitting component is a light emitting diode.

6. The touch pad as defined in claim 1, wherein a treatment of knurling is provided on said first substrate to enhance comfortable feeling of hand.

7. The touch pad as defined in claim 1, wherein a hardening treatment is provided on said first substrate to enhance anti-wear property.

8. The touch pad as defined in claim 1, wherein said first substrate is made of polycarbonate plastics.

9. The touch pad as defined in claim 1, wherein said first substrate is made of Mylar.

10. The touch pad as defined in claim 1, wherein said first substrate is made of polyester film.

11. The touch pad as defined in claim 1, wherein said first substrate is made of polycarbonate plastics and Mylar.

12. The touch pad as defined in claim 1, wherein said first substrate is printed with figures on the surface thereof and in the plastics by means of technique of in-mold decoration by roller accomplishing surface decoration after injection process (IMR).

13. The touch pad as defined in claim 1, wherein said first substrate is made of glass.

14. The touch pad as defined in claim 1, wherein the first conductor has an X-axis sensing locus 11C and a Y-axis sensing locus, a single-axis (for scrolling) and a press key (point).

15. The touch pad as defined in claim 1, wherein said electrical circuit is integrated with a processor.

16. The touch pad as defined in claim 1, wherein said electrical circuit is connected to a processor.