Citizen Electronics Co., Ltd.

Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Tatsuro Yamada

Yuki Nishikawa

Satoshi Goto

Takashi Akiyama

Yasuaki Kayanuma

Yuki Ochiai

Shigehisa Watanabe

Daisaku Okuwaki

Keisuke Sakai

Hiroto Isoda

Yu Kayanuma

Takahiro Hori

Yoshitake Horiuchi

Kenji Kusano

Kenta Miura

Kenichi Kikuchi

Light emitting diode

An LED module according to the present invention includes: a mounting substrate; a first LED group including a plurality of LEDs mounted in a first light-emitting area extending in a first direction on the mounting substrate; a second LED group including a plurality of LEDs mounted in a second light-emitting area located outside the first light-emitting area; a dam material surrounding a periphery of the second light-emitting area; a first fluorescent resin coating the first LED group and causing the first light-emitting area to emit light having a first color temperature; and a second fluorescent resin coating at least the second LED group and causing the second light-emitting area to emit light having a second color temperature higher than the first color temperature, and viscosity of the first fluorescent resin is higher than viscosity of the second fluorescent resin.

LED module

Light-emitting diode

The purpose of the present invention is to provide an LED driving circuit with which it is possible to easily manage the color temperature by adjusting light. An LED driving circuit, characterized in having: a first LED group in which a plurality of first LEDs are serially connected, the first LED group contributing to emission of light having a first color temperature; a second LED group in which a plurality of second LEDs are serially connected, the second LED group contributing to emission of light having a second color temperature; a third LED group in which a plurality of second LEDs are serially connected, the second LED group contributing to emission of light having the second color temperature; and a control unit for switching, in response to an increase in a rectified output voltage, from illumination of only the first LED group to illumination of only the second LED group and then from illumination of only the second LED group to illumination of the second LED group and the third LED group, the number of first LEDs included in the first LED group being less than the number of second LEDs included in the second LED group.

LED driver circuit

In a first aspect of the present inventive subject matter, a light-emitting device includes a substrate; a light-emitting element electrically connected to the substrate and arranged in a light-emitting area that is positioned on an upper surface of the substrate; and an electronic part that is electrically connected to the substrate and arranged outside the light-emitting area on the upper surface of the substrate, the electronic part obliquely protruding from an edge of the upper surface of the substrate.

Light-emitting device and lighting appliance including the light-emitting device

The purpose of the present invention is to provide an LED drive circuit that is capable of ameliorating insufficient lighting and improving power utilization efficiency. This LED drive circuit is an LED drive circuit wherein the number of LEDs that are turned on varies in accordance with the voltage of a commercial alternating-current power supply, the LED drive circuit being characterized by having an LED row in which multiple LEDs are connected in series, a current detection resistor for detecting a current that flows in the LED row, a bypass circuit that is connected to an intermediate connection part of the LED row, and a current-limiting circuit that is connected to an end of the LED row, wherein the bypass circuit includes a first current-limiting component, the current-limiting circuit includes a second current-limiting component, the first current-limiting component is controlled on the basis of a voltage across the ends of the current detection resistor or a voltage that is obtained by dividing the voltage across the ends of the current detection resistor, and the second current-limiting component is controlled by the divided voltage that is obtained by dividing the current detection resistor.

LED drive circuit

A film-shaped lightguide plate unit enables reductions in thickness and weight. The film-shaped lightguide plate unit () has a film-shaped lightguide plate () and a support frame () made of a film material to support at least the outer peripheral edge of the film-shaped lightguide plate (). Optical sheets including the film-shaped lightguide plate, a diffusing sheet, a prism sheet, etc. are disposed inside the support frame.

Film-shaped lightguide plate unit, planar light unit, display apparatus and electronic device

A sheet-shaped lightguide member has a first surface (A), which is divided into at least two areas. The sheet-shaped lightguide member has the first surface (A) and a second surface (B) that face each other and a peripheral edge surface (C). The lightguide member receives light through at least a part of the peripheral edge surface, guides the light, and emits the guided light from the first surface (A) serving as a light exit surface. The lightguide member is divided into the at least two light exit areas (A,B) and has a light-blocking part () provided along a boundary between mutually adjacent light exit areas to block transmission of light between the adjacent light exit areas.

Sheet-shaped lightguide member, operation panel-lighting device and electronic device

Growing community of inventors

Fujiyoshida, Japan

Tatsuro Yamada