Sony Corporation

Teruo Inaguma

Kazuo Takahashi

Junichi Honda

Koji Suzuki

Eiji Nakashio

Manabu Aizawa

Shin Sasaki

Takashi Tamura

Shigeto Watanabe

Shinji Takahashi

Tadashi Saito

Seiichi Ogata

Hiroshi Kano

Yoshito Ikeda

Seiji Onoe

Yoshihiko Inoue

Seiichi Onodera

Kazunori Onuma

Tetsuya Shibayama

Tadashi Sakurai

Disclosed is an angular velocity sensor. The angular velocity sensor includes a first layer, a piezoelectric layer, and a second layer. The first layer has a first main surface and a second main surface, and includes a vibrator portion and a base portion that supports the vibrator portion. The piezoelectric layer is formed on the first main surface of the first layer. The second layer is integrally bonded to the base portion on a side of the second main surface of the first layer.

Angular velocity sensor and method of manufacturing the same

A piezoelectric device is disclosed. A substrate has an arm portion. A piezoelectric member is disposed on the substrate. A drive electrode oscillates the arm portion by a piezoelectric operation of the piezoelectric member. First and second detection electrodes detect a Coriolis force from the oscillating arm portion. A first lead electrode having a first area is disposed on the substrate and connected to the first detection electrode and connects the first detection electrode to the outside. A second lead electrode has a second area substantially the same as the first area. The second lead electrode is disposed on the substrate asymmetrical to the first lead electrode with respect to an axis in a longitudinal direction of the arm portion and connected to the second detection electrode. The second lead electrode connects the second detection electrode to the outside. A third lead electrode connects the drive electrode to the outside.

Piezoelectric device, oscillation type gyro sensor, electronic device, and method of manufacturing piezoelectric device

A vibrating gyrosensor includes a support substrate on which a wiring pattern having a plurality of lands is formed, and a vibrating element mounted on a surface of the support substrate. The vibrating element includes a base part having a mounting surface on which a plurality of terminals, and a vibrator part integrally projected in a cantilever manner from one of the sides of the base part and having a substrate-facing surface coplanar with the mounting surface of the base part. The vibrator part has a first electrode layer, a piezoelectric layer, and a second electrode layer, which are formed on the substrate-facing surface in that order. Furthermore, a reinforcing part is formed at the base end of the vibrator part so that the sectional area of the vibrator part gradually increases toward the base part.

Vibrating gyrosensor and vibrating element

A vibrating gyrosensor includes a support substrate on which a wiring pattern having lands is formed. A vibrating element is mounted on a surface of the support substrate. The vibrating element includes a base part having a mounting surface on which a number of terminals connectable to the lands is formed. A vibrator part integrally projects from a side of the base part and has a substrate-facing surface coplanar with the mounting surface of the base part. The vibrator part has a first electrode layer, a piezoelectric layer, and a second electrode layer which are laminated on the substrate-facing surface. The vibrator part vibrates when an AC signal is applied between the first and second electrode layers. The central electric field strength of the AC signal is set at a position shifting to the positive direction from the center of a hysteresis loop of the piezoelectric layer.

Vibrating gyrosensor driven with offset potential

An angular velocity sensor includes a base portion, three arm portions that extend as one piece from the base portion to an approximately same direction, a piezoelectric film formed on one surface of each of the arm portions, drive electrodes for excitation formed on the piezoelectric films of at least two outer arm portions, and detection electrodes for angular velocity detection formed on the piezoelectric film of at least a center arm portion. Among the three arm portions, the two outer arm portions are excited in phase, and the center arm portion is excited in opposite phase with the two outer arm portions. The drive electrodes excite the arm portions in a first direction vertical to surfaces on which the piezoelectric films are formed. The detection electrodes detect a vibration in a second direction parallel to the surfaces on which the piezoelectric films of the arm portions are formed.

Angular velocity sensor and electronic device

To improve characteristics by achieving size reduction and high Q value with a simple structure. A vibratory gyrosensoraccording to the present invention includes a supporting substrate, which has a circuit element mounted thereon and a wiring pattern having a plurality of landsdisposed thereon; and a vibration elementmounted on a surface-of the supporting substrate. The vibration elementincludes a base portionhaving a mounting surface-provided with a plurality of terminalsthat are connected to the lands; and a vibrator portionextending integrally from a side of the base portionin a cantilever manner and having a substrate-facing surface which is flush with the mounting surface of the base portion, the substrate-facing surface being provided with a first electrode layer, a piezoelectric layerstacked on the first electrode layer, and a second electrode layerstacked on the piezoelectric layer. The vibration elementis mounted on the supporting substrateby joining the terminalsto the landswith metallic projectionsdisposed therebetween.

Vibratory gyrosensor having a vibration element provided with terminals

There is a need for a piezoelectric element capable of improving a productivity and a yield without impairing the piezoelectric characteristic and a method for manufacturing the same. A piezoelectric element is provided with a substrate, a first electrode film disposed on the substrate, a piezoelectric film disposed on the first electrode film, and a second electrode film disposed on the piezoelectric film. The piezoelectric film has a laminated structure composed of a plurality of crystallized piezoelectric thin films. The piezoelectric film having a predetermined thickness is formed by repeated cycles of a film formation step of forming a piezoelectric thin film and a crystallization heat treatment step of heat-treating the piezoelectric thin film to effect crystallization. In this manner, a piezoelectric film exhibiting uniform crystallinity in the film thickness direction may be produced.

Piezoelectric element and method for manufacturing piezoelectric element

A vibrating gyroscopic sensor element including a cantilever vibrator, at least one first depression on the cantilever vibrator, a pair of detection electrodes provided on the cantilever vibrator and at least one second depression on the cantilever vibrator. The cantilever vibrator projects from a base area of the vibrating gyroscopic sensor element and the first depression is effective to adjust the frequency difference between a vertical resonance frequency and a horizontal resonance frequency of the vibrator. Further, the second depression is effective to adjust the difference of signals output from the detection electrodes.

Vibrating gyroscopic sensor and method of adjusting vibrating gyroscopic sensor

A method of manufacturing a thin-film coil in which a first coil and a second coil each having a desired number of winding are electrically connected in series and the second coil is formed between winding portions of the first coil on substantially the same plane, comprising: forming the first coil having a predetermined number of windings via a first insulating film; forming a second insulating film on a surface of the first coil and between the winding portions of the first coil; forming an underlying conductive film on the second insulating film, and treating the underlying conductive film so as to leave only the bottom portions of the underlying conducting film between the winding portions of the first coil; and growing deposition originating from a remaing portion of the underlying conductive film on the bottom portions of the underlying conducting film between the winding portions of the first coil so as to form the second coil.

Method of manufacturing a magnetic head

A drive electrode to which a voltage for allowing a vibrator to vibrate is applied and first and second detection electrodes extending in the longitudinal direction of the vibrator in parallel to each other are formed as the upper electrode such that the drive electrode is interposed between the first and second detection electrodes and does not contact with the detection electrodes. In the case where there is a difference between the detection signals detected in the first and second detection electrodes when a voltage is applied between the lower electrode and drive electrode to allow the vibrator to vibrate at a vertical resonance frequency, a laser light is irradiated to a desired portion of the vibrator to apply grinding operation based on detection signals detected in the first and second detection electrodes, thereby adjusting the shape of the vibrator.

Vibration gyro sensor element with cantilever vibrator extending from substrate and positioned within opening in substrate

A vibrating gyrosensor includes a support substrate on which a wiring pattern having a plurality of lands is formed, and vibrating elements mounted on a surface of the support substrate, wherein at least two vibrating elements are mounted on the support substrate, for detecting vibrations in different axial directions.

Vibrating gyrosensor

A vibrating gyroscopic sensor including a vibrating gyroscopic sensor element including a cantilever vibrator that includes a piezoelectric film, a driving electrode, and a pair of detection electrodes on a first surface, and a support substrate on which the vibrating gyroscopic sensor element is mounted. The vibrating gyroscopic sensor element is mounted on the support substrate so that the first surface of the cantilever vibrator faces the support substrate. An area other than the first surface of the cantilever vibrator is defined as a laser processing area where a depression for adjusting the vibration characteristics of the cantilever vibrator is to be provided.

Method of manufacturing vibration gyro sensor element, vibration gyro sensor element, and method of adjusting vibration direction

Disclosed is a small-sized vibration type gyrosensor device of high sensitivity provided with a cantilevered oscillator. A cantilevered oscillator, provided with a lower electrode, a piezoelectric film and an upper electrode, formed on a single-crystal silicon substrate by a thin film forming process, includes, as an upper electrode, a driving electrode, formed along the length of the oscillatorfor applying the voltage for causing oscillations of the oscillator, and first and second detection electrodes, formed on both sides of the driving electrodeparallel to the longitudinal direction of the oscillator, without contacting with the driving electrode. With a width Wof the driving electrode, a width Wof the first detection electrode, a width Wof the second detection electrodeand with W=WWW, the condition of 0.5&#x3c;(W/W)&#x3c;1 is to be met.

Vibration type gyrosensor device

The width W of the lower shield thin film and the width W of the upper shield thin film are specified so that each of these widths is larger than the width W of the MR element and is smaller than the contact width W

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Miyagi, Japan

Teruo Inaguma