Murata Manufacturing Co., Ltd.

Hiroshi Ibaragi

Ryuichi Kawai

Hiroyuki Yamamoto

Hiroaki Kaida

Yutaka Ikeda

Kazuto Miyagawa

Yoshiaki Abe

Yoshitaka Nagao

A quartz crystal resonator unit includes a quartz crystal resonator that includes a quartz crystal blank. A pair of excitation electrodes are disposed on opposed main surfaces of the quartz crystal blank so as to face each other. A pair of connection electrodes are electrically connected to respective ones of the pair of excitation electrodes. A base member has a surface on which the quartz crystal resonator is mounted. A lid member is joined to the surface of the base member via a joining member. The quartz crystal resonator is accommodated in an inner space defined by the lid member and the base member on the surface of the base member. Parts of the joining member that cover protruding portions are in contact with a side wall of the lid member so as to restrain movement of the lid member when seen in a plan view in a direction normal to the surface of the base member.

Quartz crystal resonator unit and method of manufacturing the same

A quartz crystal resonator unit that includes a quartz crystal resonator, a lid member and a base member defining an internal space that accommodates the quartz crystal resonator, and a sealing frame and a joining material joining the lid member and the base member to each other. In a plan view of a principal surface of the base member, the sealing frame and the joining material have a frame shape surrounding the quartz crystal resonator, and the frame shape has a uniform width.

Piezoelectric resonator unit and method for manufacturing the piezoelectric resonator unit

A method for manufacturing a piezoelectric resonator unit by forming a via conductor in a through hole of a ceramic substrate, forming a connection electrode foundation layer connected to the via conductor, and forming a sealing frame foundation layer in a substantially frame shape. The ceramic substrate is then fired together with the via conductor, the connection electrode foundation layer, and the sealing frame foundation layer. The surface of the connection electrode foundation layer and the surface of the sealing frame foundation layer are flattened by pressing the ceramic substrate from a first main surface side and a second main surface side thereof. A plating treatment is carried out to form a connecting electrode and a sealing frame. A piezoelectric resonator is electrically connected to the connection electrode.

Piezoelectric resonator unit and manufacturing method for the same

A rectangular quartz crystal blank having long sides substantially parallel to a Z' axis of the quartz crystal blank, and short sides substantially parallel to an X axis of the quartz crystal blank. The quartz crystal blank includes a first center region, a second region and a third region that are adjacent to the first region along a long-side direction, and a fourth region and a fifth region that are adjacent to the first region along a short-side direction. A thickness of the second region and a thickness of the third region are smaller than a thickness of the first region, and/or a thickness of the fourth region and a thickness of the fifth region are smaller than the thickness of the first region, and 19.87&#x2264;W/T&#x2264;20.36, where W is a length of a short side and T is a thickness.

Quartz crystal blank and quartz crystal resonator unit

A rectangular quartz crystal blank having long sides substantially parallel to a Z' axis of the quartz crystal blank, and short sides substantially parallel to an X axis of the quartz crystal blank. The quartz crystal blank includes a first center region, a second region and a third region that are adjacent to the first region along a long-side direction, and a fourth region and a fifth region that are adjacent to the first region along a short-side direction. A thickness of the second region and a thickness of the third region are smaller than a thickness of the first region, and/or a thickness of the fourth region and a thickness of the fifth region are smaller than the thickness of the first region, and 13.84&#x2264;W/T&#x2264;14.33, where W is a length of a short side and T is a thickness.

A power feeding device includes a cover, a primary coil covered with the cover and provided in a predetermined direction with respect to the cover, and a temperature-sensitive detector that detects the temperature of an object on the cover. When the distance from the surface of the cover to the temperature-sensitive detector in the predetermined direction is denoted by L [m], the temperature of the object to be subjected to thermometry by the temperature-sensitive detector is denoted by T[K], the temperature to be detected by the temperature-sensitive detector is denoted by T[K], and the thermal conductivity of the cover is denoted by &#x3bb; [W/(m&#xb7;K)], L satisfies the following equation This allows the temperature of the object on the cover to be accurately detected.

Power feeding device and power receiving device for contactless power transmission

A power feeding device includes a cover, a primary coil covered with the cover, and a plurality of temperature-sensitive detectors provided in the cover, which detect the temperature of an object on the cover. When the distance between adjacent temperature-sensitive detectors is denoted by W [m], the temperature of the object to be subjected to thermometry by the temperature-sensitive detectors is denoted by T[K], the temperature to be detected by the temperature-sensitive detectors is denoted by T[K], and the thermal conductivity of the cover is denoted by &#x3bb; [W/(m&#xb7;K)], W satisfies the following equation This allows the power feeding device to accurately detect the temperature of the object on the cover.

In a method for sorting PTC elements having different resistance-temperature characteristics, a predetermined voltage that allows a current to sufficiently decay is applied to each of PTC elements A and B, and the PTC elements are sorted on the basis of the difference between the times required for the currents passing through the PTC elements B to reach a predetermined value (e.g., 52 mA).

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Nagaokakyo, Japan

Hiroshi Ibaragi