Key sheet, light blocking effect sheet, push button switch and key sheet manufacturing method
AssigneePolymatech Co., Ltd.
InventorYasunori Takeda
Life of this patent
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Abstract
Provided is a key sheet or a lightproof light guiding sheet guiding light efficiently through an interior of the key sheet and preventing light leakage through a periphery of key tops. On a base sheet, a transparent resin layer, and further, a lightproof dark print layer are provided as needed, with at least one of the transparent resin layer and the lightproof dark print layer being formed of a non-corrosive coating liquid. Further, a smooth surface is formed between the base sheet and the dark print layer.
Claims20
A key sheet allowing illumination, comprising:
- a base sheet formed of a transparent resin film;
- and
- at least one depressing operation portion provided on an operation surface side of the base sheet,
- wherein the base sheet is a light guiding sheet, and
- wherein a dark print layer shielding light is provided on at least one surface of the base sheet, with a smooth surface being provided between the base sheet and the dark print layer.
A lightproof light guiding sheet comprising:
- a light guiding sheet;
- and
- a dark print layer shielding light, which is provided on at least one surface of the light guiding sheet, with a smooth surface being provided between the light guiding sheet and the dark print layer.
A pushbutton switch comprising:
- a key sheet allowing illumination, comprising,
- a base sheet formed of a transparent resin film, and
- at least one depressing operation portion provided on an operation surface side of the base sheet;
- and
- a circuit board comprising a contact switch and an inner light source,
- wherein the base sheet is a light guiding sheet, and
- wherein a dark print layer shielding light is provided on at least one surface of the base sheet, with a smooth surface being provided between the base sheet and the dark print layer.
A method of manufacturing a key sheet,
- the key sheet allowing illumination, comprising:
- a base sheet formed of a transparent resin film;
- and
- at least one depressing operation portion provided on an operation surface side of the base sheet,
- wherein the base sheet is a light guiding sheet, and
- wherein a dark print layer shielding light is provided on at least one surface of the base sheet by applying and curing a coating liquid, with a smooth surface being provided between the base sheet and the dark print layer.
Dependencies are inferred from the claim text.