Alps Electric Co., Ltd.

Takenobu Kimura

Hideaki Nagakubo

Kazutoshi Watanabe

Naoki Yamada

Koichi Yamamoto

Katsuyuki Katayama

Keiji Takagi

Naoya Akiyama

Shinichiro Kimura

Masahiro Ishida

Naomi Sato

Toshinobu Hosaka

An input device includes a plurality of manipulation portions; an input function portion manipulated by the manipulation portions to perform an input function; a light guiding sheet facing the rear side of the plurality of manipulation portions; and a light source applying light into the light guiding sheet, wherein a rear surface opposite to a front surface of the light guiding sheet facing the manipulation portions is provided with a plurality of concave portions which is depressed to the inside of the light guiding sheet, wherein each concave portion has a circular opening and an inner surface which is a smooth concave curve surface, and wherein light propagated through the inside of the light guiding sheet is reflected by the inner surface toward the inside of the light guiding sheet, and the light is applied from the front surface of the light guiding sheet to the manipulation portions.

Input device and keyboard device having illumination function

A backlightincludes a light source, a light guide platefor introducing light emitted from the light sourcefrom an incidence surfaceprovided on an end and for emitting the light from one surface, a diffusive reflectorprovided such that the surface having a minute concavo-convex portionfaces the other surface of the light guide plate, and a light directivity control sheetprovided on the one surface of the light guide platesuch that the apexesof pyramid-shaped objectsface the opposite side to the light guide plate

Backlight unit and liquid crystal display device

Growing community of inventors

Fukushima-ken, Japan

Takenobu Kimura