Three-dimensional touch knob
A touch knob includes a knob shell having a three-dimensional contour with a curved joint surface; an ITO touch sensor disposed on the knob shell; an auxiliary conductive unit with extensibility, connected on the touch sensor to form an overlapping area covering the joint surface, and the auxiliary conductive unit in the overlapping area having a conductive pattern corresponding to the touch sensor; and a surface coating layer having a three-dimensional contour corresponding to the knob shell and attached on both the touch sensor and the auxiliary conductive unit. An opaque mask surface is provided on an inner side of the surface coating layer. The mask surface cloaks the overlapping area.
1. A three-dimensional touch knob comprising:
a knob shell, made of an insulative material, having a three-dimensional contour with a first surface, a second surface and a joint surface, wherein the first surface is located at an outer surface of a top of the knob shell, the second surface is located an outer surface of a lateral periphery of the knob shell, and the joint surface connects between the first surface and the second surface;
a touch sensor, formed by a conductive metal oxide film, having a touch sensing area on the first surface, the joint surface and at least part of the second surface;
an auxiliary conductive unit, electrically connected on the touch sensor to form an overlapping area covering the joint surface and at least part of the second surface, wherein the auxiliary conductive unit in the overlapping area has a conductive pattern corresponding to the touch sensor; and
a surface coating layer, made of an insulative transparent material, having a three-dimensional contour corresponding to the knob shell, and attached on both the touch sensor and the auxiliary conductive unit, wherein an opaque mask surface is provided on an inner side of the surface coating layer, and the mask surface cloaks at least the overlapping area.
2. The three-dimensional touch knob of claim 1 , wherein the joint surface is a curved surface, a spherical curved or an obtuse surface.
3. The three-dimensional touch knob of claim 1 , wherein the touch sensor is a capacitive touch sensor, an electromagnetic touch sensor, an acoustic touch sensor, a vibrating touch sensor touch sensor or an optical touch sensor.
4. The three-dimensional touch knob of claim 1 , wherein the touch sensor is made of indium tin oxide, indium zinc oxide, zinc aluminum oxide or antimony tin oxide.
5. The three-dimensional touch knob of claim 1 , wherein the auxiliary conductive unit is made of conductive silver paste or a metal film whose primary component is one of gold, silver, copper, aluminum, molybdenum and nickel.
6. The three-dimensional touch knob of claim 1 , wherein the mask surface is formed by insulative ink or photoresist.
7. The three-dimensional touch knob of claim 6 , wherein the mask surface is provided with a decorative pattern, an icon or a symbol.
8. The three-dimensional touch knob of claim 1 , wherein the knob shell is made of glass, polymethyl methacrylate, polystyrene, polycarbonate or polypropylene.
9. The three-dimensional touch knob of claim 8 , wherein the first surface of the knob shell is a transparent area, and the first surface, the touch sensor and the surface coating layer jointly form a transparent window.
10. The three-dimensional touch knob of claim 9 , wherein a chamber in the knob shell is provided with a liquid crystal display (LCD) or a light emitting diodes (LED).