Sharp Kabushiki Kaisha Corporation

Terukazu Ohtsuki

Hitoshi Azuma

Yasuhiro Wada

Masahiko Kimoto

Takahiro Funakoshi

Hiroshi Minematsu

Nobuyuki Tominaga

Shinji Yamana

Takehiro Yamamoto

Hitoshi Ikeda

Provided is an electronic circuit module using a board having no cavity and a method for efficiently fabricating it. Electronic components are mounted on the front face of a module board, and an LSI chipis die-bonded on the bottom face thereof in a bare-chip state with gold wires. Around the LSI chip, metal blocksmade of copper are mounted by soldering. The LSI chip, the gold wires, and the metal blocksprovided on the bottom face of the module boardare sealed with resinwith a motherboard-facing faceof each metal blockand a facethereof flush with the corresponding side face of the module boardexposed from the resin. These exposed portions serve as electrode terminals when the moduleis soldered to a motherboard. The module boardis obtained by cutting a sheet circuit board into individual unit module boards

Electronic circuit module and method for fabrication thereof

A plane-shaped lighting device has a light-directing plate and a light source that is placed in contact with or in the proximity of the light-incident surface of the light-directing plate, and the light source is constituted of a plurality of LED lamps each of which has an LED chip for emitting light and a semispherical lens for directing the light from the LED chip into the light-directing plate. Here, the distance from the LED chip to the top of the semispherical lens is set to be 1.8 times as long as the radius of curvature of the semispherical lens. This arrangement allows the light emitted from the LED chip to be efficiently incident on the light-incident surface of the light-directing plate, thereby improving the light-incidence efficiency to the light-directing plate. Further, the application of this plane-shaped lighting device to display devices makes it possible to improve the efficiency of light utilization, and consequently to provide thinner display devices with high visibility.

Plane-shaped lighting device and a display using such a device

An image reader is equipped with a light source having a plurality of LEDs arrayed in a row, a light-guiding transparent board, a concave mirror, a condenser lens and a photoelectric converter. The transparent board is disposed between the light source and the concave mirror, and has an illuminating light output surface to be in contact with a document, an illuminating light input surface which is tilted at an angle relative to the output surface and on which light from the light source is to be incident, and first and second side surfaces located in opposition to each other between the illuminating light input and output surfaces. In operation, since the output surface is tightly in contact with the document, light dissipation is prevented. Since the input surface and the output surface are sufficiently separated from each other, rays of light emitted by the individual LEDs are mixed up inside the transparent board. Reflected light from the document travels inside the transparent board, is then reflected by the input surface, and goes out from the second side surface to the photoelectric converter via the condenser lens.

Image reader having a light-guiding transparent board

A light-source device includes a light source and a light-pervious flat board, the light source being optically connected to one side of the flat board for introduction of light into the flat board so that the incoming light is caused to be reflected from other side of the flat board therewithin for being directed outward from the flat board, the light reflecting side of the flat board being indented to provide a surface having a serrated sectional configuration.

Growing community of inventors

Nara, Japan

Terukazu Ohtsuki