Matsushita Electric Industrial Co., Ltd.

Onkyo Corporation

Onkyo & Pioneer Technology Corporation

Takuya Oka

Shigeo Aoki

Tsuyoshi Kawaguchi

Yutaka Harada

Norimasa Kitagawa

Masaaki Ueda

Keiichi Iiyama

Shinji Murakami

Takashi Noda

Masaru Tanichi

Yukihiko Kimura

A first circuit unit of an audio amplifier includes a first emitter follower connected to an pre stage input terminal, a second emitter follower connected to an pre stage input terminal, a main transistor connected to an output path of the first emitter follower and an output path of the second emitter follower, a first resistor and a second resistor, which are series-connected between the output path of the first emitter follower and a DC voltage source, and a zener diode connected to a series-connection point between the first resistor and the second resistor. A second circuit unit has a circuit configuration that is complementary to the first circuit unit. A path leading to a collector of each transistor configuring the first and second emitter followers in one of the circuit units is connected to the series-connection point in the other circuit unit.

Audio amplifier and audio power amplifier

There is provided a protection circuit that is mounted between an AC adapter and a load circuit, operates with power supplied from the AC adapter, has a soft start function, and can perform overvoltage protection and the like. An audio deviceis configured to include a protection circuitat the side of the AC adapter, as well as a load circuitthat is an audio circuit body and a speaker. The protection circuitincludes an input terminalconnected to the AC adapter, an output terminalconnected to the load circuit, a power supply lineextending toward the output terminalfrom the input terminal, a switch unitand a DC/DC converter, the switch unitand the DC/DC converterbeing provided along the power supply line, and a protection circuit unitthat detects a voltage state or a current state on the power supply lineand protects the DC/DC converterand the load circuit

Protection circuit

An electronic circuit module formed of an antenna coil and an integrated circuit provided on a circuit board is provided inside a hollow resin case formed of a first part and a second part. A first slit leading into the hollow portion is provided in one side face of the resin case formed of the first and second parts joined to each other. Since the electronic circuit module is not exposed to high temperatures and high pressure during the manufacturing process, defects such as the breakage of the integrated circuit or the disconnection of the antenna coil can be avoided. Since the slit leading into the hollow portion is provided, the hollow portion does not swell by the temperature increase. In addition, pinholes do not tend to be formed during the joining of the first and second parts. Thus, a contactless data carrier with an excellent electrostatic withstand voltage characteristic can be provided.

Contactless data carrier

System for issuing and utilizing ticket

In a financial transaction data processing system, plural host computers maintained by banks and containing bank account information are interconnected by a communications network, and plural automated teller machines are connectable to the plural host computers. Portable data carriers are provided each containing a non-volatile memory for storing money balances. Also, at a wholesaler location or the like, a terminal device connectable to at least one of the host computers is provided. The portable data carriers are insertable into the automated teller machines to transfer money from a bank account to the portable data carrier inserted in the automated teller machine. Also, the portable data carriers are insertable into the terminal device to transfer money from the inserted portable data carrier to a memory of the terminal device. Accumulated transactions in the terminal device are stored on another portable data carrier which is then taken to an automated teller machine to transfer the money from the portable data carrier to a bank account of the wholesaler or the like. Also, verification of the transaction is effected by transmitting data from the terminal device to a connected host computer.

Data transfer system and data transfer terminal device

Growing community of inventors

Osaka, Japan

Takuya Oka