Membrane circuit board and keyboard having the same
AssigneeChicony Electronics Co., Ltd.
InventorsChing-Cheng Tsai, Cheng-Hui Shen
Life of this patent
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Abstract
A membrane circuit board and a keyboard device having the same are provided in the invention. The membrane circuit board is defined with a plurality of key regions. Each of the key regions is with a pressing region and at least one light-pervious region thereon. The membrane circuit board comprising at least two light-pervious membranes stacked with each other, and at least one light-pervious adhesive layer sandwiched between the two light-pervious membranes and at least fully filled in the light-pervious region.
Claims14
A keyboard, comprising:
- a keycap comprising at least one light-pervious pattern;
- an emitting layer outputting lights towards the keycap;
- an elastic element arranged between the keycap and the emitting layer, and coupling to the keycap;
- and
- a membrane circuit board arranged between the elastic element and the emitting layer, and having a pressing region and at least one light-pervious region thereon, wherein the pressing region is aligned with the elastic element, and the light-pervious region is at least located at a vertical projection zone vertically projected on the membrane circuit board by the light-pervious pattern, and the membrane circuit board comprises:
- a plurality of light-pervious membranes stacked with each other;
- and
- at least one light-pervious adhesive layer sandwiched between every two neighboring light-pervious membranes, and fully filled in the light-pervious region.
A membrane circuit board defined with a plurality of key regions in which each of the key regions is defined with a pressing region and at least one light-pervious region thereon, the membrane circuit board comprising:
- a first light-pervious membrane;
- a second light-pervious membrane stacked on a side of the first light-pervious membrane;
- and
- an upper circuit pattern overlaid on a surface of the first light-pervious membrane facing to the second light-pervious membrane, the upper circuit pattern comprising:
- at least one upper electrode point located in the pressing region;
- and
- at least one upper printed wire connected to the upper electrode point;
- a lower circuit pattern overlaid on a surface of the second light-pervious membrane facing to the first light-pervious membrane, the lower circuit pattern comprising:
- at least one lower electrode point located in the pressing region, straightly aligned the upper electrode point, maintained a gap with the aligned upper electrode point, wherein the gap is with no physical obstacle;
- and
- at least one lower printed wire connected to the lower electrode point;
- and
- at least one light-pervious adhesive layer sandwiched between the first light-pervious membrane and the second light-pervious membrane, and fully filled in the light-pervious region.
A membrane circuit board defined with a plurality of pressing regions thereon and a single light-pervious region surrounding the pressing regions, the membrane circuit board comprising:
- a first light-pervious membrane;
- a second light-pervious membrane stacked on a side of the first light-pervious membrane;
- and
- at least one light-pervious adhesive layer sandwiched between the first light-pervious membrane and the second light-pervious membrane, and the light-pervious adhesive layer comprising:
- a light-pervious adhesive material fully filled in the light-pervious region only;
- and
- a plurality of hollow portions arranged on the light-pervious adhesive layer and correspondingly aligned to the pressing regions one on one.
Dependencies are inferred from the claim text.