Citizen Electronics Co., Ltd.

Citizen Holdings Company, Ltd.

Citizen Watch Company, Ltd.

Authentic, Inc.

Shigehisa Watanabe

Takashi Akiyama

Yuki Ochiai

Hidekazu Arai

Tatsuro Yamada

Satoshi Goto

Keisuke Sakai

Keita Watanabe

Yuki Nishikawa

Ryo Tamura

Kazuhiro Kobayashi

Yoshiro Ohkawa

Yuki Ochial

The purpose of the present invention is to reduce the size and thickness of an LED module. The LED module includes a circuit substrate, at least two supply terminals, a plurality of LED dies, a plurality of FET die, a constant current circuit, a dam member, a fluorescent resin, a resistor network, and a bypass circuit, wherein the constant current circuit includes one of the plurality of FET die and the bypass circuit includes other of the plurality of FET die, a portion of the dam enclosing the LED block region forms a portion of the dam enclosing the circuit block region, and the dam member enclosing the LED block region has a annular shape and the dam member enclosing the circuit block region has a rectangular shape except for said portion of the dam member.

Packaging of LED chips and driver circuit on the same substrate

Light-emitting diode

The purpose of the present invention is to reduce the size and thickness of an LED module in which a plurality of LED dies along with other electronic components are mounted on a circuit board, and at the same time to stabilize the operation of the module with respect to source voltage fluctuation. The LED module includes: a circuit board; a plurality of LED dies that are mounted on one surface of a circuit board as bare chips and constitute a series circuit; an FET die that is mounted on the one surface of a circuit board as bare chips and controls a current flowing through the plurality of LED dies; and a constant current circuit that is mounted on the one surface of a circuit board and is series-connected to the series circuit. The constant current circuit includes the FET die.

LED module

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

An actuator, comprising at least one beam capable of generating flexural oscillations, at least one pair of electric supply terminals () which supply oscillation-inducing electric power to the beam(s), and a holding mechanism which holds the beam(s), the holding mechanism including at least one holding member () to hold one portion of the beam(s) and a case () jointed to the holding member and configured to contain the beam(s) therein.

Actuator

A sound producing device has an electroacoustic transducer mounted in a case. A sound discharging nozzle is projected from the case and communicated with an upper chamber above the electroacoustic transducer.

Sound producing device for an electronic instrument such as a telephone

Electromagnetic sound generator

A casing is provided to be mounted on a printed circuit. The casing has a lower casing and an upper casing. An actuator is provided in the casing, and an armature is supported in the casing so as to be vibrated by the actuator. A sound emanating hole is formed in a peripheral side wall of the upper casing, and a pressure releasing hole is formed in a peripheral side wall of the lower casing.

Surface mount electromagnetic sound producing device

Growing community of inventors

Yamanashi-ken, Japan

Shigehisa Watanabe