Alps Electric Co., Ltd.

Qualcomm Incorporated

Akihiko Inoue

Akiyuki Yoshisato

Kazuhiko Ueda

Hiroshi Sakuma

Shigekata Sugiura

Yasuhiro Ikarashi

Shigetoshi Matsuta

John K Lee

Shoji Kai

Hideki Kondo

Takeo Ito

Yoshio Suzuki

Yutaka Shoji

Yasuhio Ikarashi

A surface acoustic wave (SAW) filter includes a SAW chip mounted in a recession of a multi-layer substrate, a sealing plate covering the recession, an end surface electrode that is provided on the outer surface of the substrate and is in conduction with the SAW chip, a metal conductor for radiating heat that is provided on the surface at the opposite side from the sealing plate of the multi-layer substrate, and a through hole provided in the substrate, one end thereof being connected to the metal conductor. The other end of the through hole is connected with the SAW chip through the intermediary of a metal constituent, such as an electrically conductive adhesive layer.

Surface acoustic wave filter adapted to restrain undue temperature rise

The invention provides a surface mounting type electronic circuit unit that is suitable for miniaturization and is suitable for simple output adjustment. Circuit elements including capacitors, resistors, and inductance elements and a conducting pattern connected to the circuit elements are formed on an alumina substrate by means of thin film forming technique, and a diode D and a semiconductor chip of a transistor are fixed to a connection land of the conducting pattern by means of wire bonding, wherein only the emitter resistor out of the base bias voltage dividing resistors and the emitter resistor of the transistor is trimmed for output adjustment.

Electronic circuit unit that is suitable for miniaturization and suitable for simple output adjustment

In a surface-mounting-type electronic-circuit unit, circuit elements, including capacitors, resistors, and inductive devices, and electrically conductive patterns connected to the circuit elements are formed on an alumina board as thin films. Semiconductor bare chips for a diode and a transistor are wire-bonded to connection lands in electrically conductive patterns. And end-face electrodes connected to grounding electrodes, input electrodes, and output electrodes of electrically conductive patterns are formed at side faces of the alumina board.

Compact, surface-mounting-type, electronic-circuit unit

The invention provides an electronic circuit unit that is suitable for miniaturization and excellent in high frequency characteristic. Capacitors and a wiring pattern are formed on an alumina substrate by means of thin film forming technique, and a part of the wiring pattern is served as the connection land for mounting a bare chip of a transistor. Among the capacitors, the top electrode of the capacitor is served also as a part of the connection land, and the bottom side collector electrode of the bare chip is connected to the connection land by use of conductive adhesive. Top electrodes of the residual capacitors are served as the bonding pad, and the base electrode and the emitter electrode on the top side of the bare chip are connected to the top electrodes of the respective capacitors by a wire.

Electronic circuit unit that is suitable for miniaturization and excellent in high frequency characteristic

To provide a surface-mounting type electronic circuit unit suitable for miniaturization, circuit elements including capacitors, resistors and inductance elements and a conductive pattern connected to these circuit elements are thinly formed on an alumina substrate, semiconductor bare chips for a diode and a transistor are bonded on a connection land of the conductive pattern via wire, an inductance element composed of a pair of conductors opposite at a predetermined interval on the aluminum board is thinly formed and a unbalance/balance converter is formed by these conductors.

Surface-mounting type electronic circuit unit suitable for miniaturization

The antenna element mounting of the present invention enables an antenna to be mounted between the printed circuit boards of a radio instead of along side the boards. The shielding of the printed circuit boards has an indentation along one edge of each shield. When the shields are mated, the indentations form a channel into which the antenna is mounted.

Antenna element mounting in a radio

A vibration-preventing mechanism for a lock type push button switch eliminates vibration, chattering and vibration noise of a resilient spring contact by forming a projection on each push button.

Vibration-preventing mechanism for use in a push button switch

A locked-type push-button device which has a plurality of push buttons and only one of the push buttons can be locked in the depressed state when it is depressed. A mechanism includes a cam for preventing the simultaneous locking of two adjacent push buttons, which has nearly a semicircular shape in cross section. The cam has notches at positions corresponding to the positions of the push buttons, and the notches each have a width greater than the width of the respective push buttons. The notches are alternately arrayed on opposite sides of the cam, and is thus urged to turn in the opposite directions when it is depressed by the neighboring push buttons.

Mechanism for preventing the simultaneous locking of push buttons in a

A miniature variable resistor comprising an insulating substrate provided with a hole therethrough. A resistance pattern which is carried on a front surface of the insulating substrate in a manner to surround the hole, and a hollow rotor of insulating synthetic resin is provided with an operating portion and a slidable contact portion slidable on the front surface. A slide member is unitarily embedded in the rotor and which has elastic protuberant pieces protruding into the hollow portion of the rotor, and a shaft member which protrudes beyond the hole from a rear surface of the insulating substrate is fitted tightly in the hollow portion of the rotor.

Miniature variable resistor

Disclosed is a locking device for locking a door and the like, suitable for use in an electric locking system. The device has a dead bolt which is held in a retracted position within a housing when the door is open, and an actuating member adapted to be partially projected out of the housing when the door is open. The actuating member is slidably mounted in the housing and has an inclined surface acting as a cam surface for engagement with the end surface of the door. The actuating member is so inter-related with the dead bolt that the latter is driven into a corresponding hole in the door jam as the slidable member is depressed by the door, in the course of closing of the door. An electromagnetic plunger is provided for allowing the retraction of the dead bolt in accordance with a predetermined specific electric signal. A manually operative member is associated with the electromagnetic plunger to allow a manual unlocking if necessary.

Growing community of inventors

Soma, Japan

Akihiko Inoue