Abstract: In a piezoelectric element, a piezoelectric film, a first electrode film provided on one surface of the piezoelectric film, and a second electrode film provided on the other surface of the piezoelectric film form a layered structure, an outer contour of the first electrode film and an outer contour of the second electrode film are positioned outside an outer contour of the piezoelectric film as viewed in a layering direction, an organic resin film is in contact with the piezoelectric film, and generation of noise is suppressed.

Abstract: In a piezoelectric element, a piezoelectric film, a first electrode film provided on one surface of the piezoelectric film, and a second electrode film provided on the other surface of the piezoelectric film form a layered structure, an outer contour of the first electrode film and an outer contour of the second electrode film are positioned outside an outer contour of the piezoelectric film as viewed in a layering direction, an organic resin film is in contact with the piezoelectric film, and generation of noise is suppressed.

Abstract: The present invention provides an electronic device with improved characteristics and a method of making the electronic device. In a method of making an electronic device (piezoelectric device) 74 according to the present invention, an outer edge R1 of a piezoelectric film 52A formed on an electrode film 46A of a laminate 60 is located inside an outer edge R2 of the electrode film 46A. For this reason, in removal of a monocrystalline Si substrate 14 from a multilayer board 61, where an etching solution permeates between polyimide 72 and laminate 60, the etching solution circumvents the electrode film 46A before it reaches the piezoelectric film 52A. Namely, a route A of the etching solution to the piezoelectric film 52A is significantly extended by the electrode film 46A. In the method of making the electronic device 74, therefore, the etching solution is less likely to reach the piezoelectric film 52A.

Abstract: An angular velocity sensor element is provided which is capable of preventing even transmission of sudden externally-applied vibration to an element portion by absorbing the vibration. An angular velocity sensor element 2 according to the present embodiment has a fixing portion 21 in the form of a frame, an element portion 20 disposed in the frame of the fixing portion 21 and having vibrating arms 21 to 24 in a drive system and a detection system, and a connecting portion 25 formed as a fixed-fixed beam having its both ends connected to the fixing portion 21 and having its intermediate portion connected to the element portion 20.

Abstract: A piezoelectric element having a crystal structure that enables a piezoelectric film to be formed in an unstressed state is provided. The piezoelectric film contains an a-axis oriented crystal and a c-axis oriented crystal, where a difference in lattice constant between the a-axis oriented crystal and the c-axis oriented crystal is not more than 0.06 ?. The present inventors have newly found that a stress accumulated in the piezoelectric film can be reduced while maintaining favorable piezoelectric properties when a condition that the difference in lattice constant between the a-axis oriented crystal and the c-axis oriented crystal is not more than 0.06 ? is satisfied. When the condition is satisfied, the c-axis oriented crystal and the a-axis oriented crystal are properly balanced and as a result crystal particles of the piezoelectric film are closest-packed on its base in an ideal state, which contributes to a reduced stress.

Abstract: An angular velocity sensing element is provided, which is able to prevent breakage of an oscillation arm even when an excessively large shock is given. An angular velocity sensing element 2 according to the present embodiment includes oscillation arms 22, 23 and 24 formed of a semiconductor material, and a stopper member provided to limit the oscillation range of the oscillation arms. As such a stopper member, a first stopper member 25 is provided, for example, which limits the oscillation range of the oscillation arms at least within a single plane of the arms. Fixing portions 21, the oscillation arms 22, 23 and 24 and the first stopper member 25 are integrally formed by processing a semiconductor material, such as silicon.

Abstract: An angular velocity sensor of a horizontally located type, in which influence of a translational acceleration applied thereto from a lateral direction is readily removed and a fixed portion thereof is easily fixed, is provided. It includes a fixed portion fixed to the top surface of a sensor element supporting portion of a casing, an upper detection arm portion and a lower detection arm portion respectively connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the top surface of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion with the upper detection arm portion in between. The fixed portion includes one or more slits extending at least in a direction intersecting with the extending direction of the upper detection arm portion.

Abstract: Proposed is a horizontally located angular velocity sensor hardly affected by a translational acceleration in a lateral direction, and in which a fixed section is easily fixed. The angular velocity sensor includes a fixed section fixed on a support surface. On both sides of the fixed section, an arm section of an upper detection arm and a pair of upper drive arms extending along a plane parallel to the support surface, and an arm section of a lower detection arm and a pair of lower drive arms extending along the plane parallel to the support surface are coupled, respectively. The upper detection arm and the pair of upper drive arms are coupled without the fixed section in between, and the lower detection arm and the pair of lower drive arms are coupled without the fixed section in between.

Abstract: An angular velocity sensor of a horizontally located type, which can easily remove the translational acceleration influence thereto from the lateral direction, is provided. It includes a fixed portion fixed to the surface of a sensor element supporting portion of a casing, an upper detection arm and a lower detection arm, each of them being connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the surface place of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion in such a manner as to form a pair of arms with the upper detection arm in between and extending in a direction parallel to the extending direction of the upper detection arm.

Abstract: Provided is a horizontally located sensitive angular velocity sensor capable of easily eliminating influence of acceleration in a lateral direction and whose fixed section is easily fixed. The angular velocity sensor includes a pair of fixed sections fixed on a top of an sensor support section of a case, a detection arm extending along a plane parallel to the sensor support section, and a pair of upper drive arm and lower drive arm extending along the plane parallel to the sensor support section and extending in a direction opposite to each other so as to intersect an extending direction of the detection arm.

Abstract: A piezoelectric element having a crystal structure that enables a piezoelectric film to be formed in an unstressed state is provided. The piezoelectric film contains an a-axis oriented crystal and a c-axis oriented crystal, where a difference in lattice constant between the a-axis oriented crystal and the c-axis oriented crystal is not more than 0.06 ?. The present inventors have newly found that a stress accumulated in the piezoelectric film can be reduced while maintaining favorable piezoelectric properties when a condition that the difference in lattice constant between the a-axis oriented crystal and the c-axis oriented crystal is not more than 0.06 ? is satisfied. When the condition is satisfied, the c-axis oriented crystal and the a-axis oriented crystal are properly balanced and as a result crystal particles of the piezoelectric film are closest-packed on its base in an ideal state, which contributes to a reduced stress.

Abstract: The present invention provides an angular velocity sensor in which higher sensitivity for sensors is available even with a smaller base portion. The angular velocity sensor includes a fixed portion fixed to the top surface of a sensor element supporting portion of a casing, an upper detection arm and a lower detection arm, each of them being connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the top surface of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion in such a manner as to form a pair of arms with the upper detection arm in between and extending in a direction parallel to the extending direction of the upper detection arm.

Abstract: The present invention provides an electronic device with improved characteristics and a method of making the electronic device. In a method of making an electronic device (piezoelectric device) 74 according to the present invention, an outer edge R1 of a piezoelectric film 52A formed on an electrode film 46A of a laminate 60 is located inside an outer edge R2 of the electrode film 46A. For this reason, in removal of a monocrystalline Si substrate 14 from a multilayer board 61, where an etching solution permeates between polyimide 72 and laminate 60, the etching solution circumvents the electrode film 46A before it reaches the piezoelectric film 52A. Namely, a route A of the etching solution to the piezoelectric film 52A is significantly extended by the electrode film 46A. In the method of making the electronic device 74, therefore, the etching solution is less likely to reach the piezoelectric film 52A.

Abstract: The present invention provides an electronic device with improved characteristics and a method of making the electronic device. In a method of making an electronic device (piezoelectric device) 74 according to the present invention, an outer edge R1 of a piezoelectric film 52A formed on an electrode film 46A of a laminate 60 is located inside an outer edge R2 of the electrode film 46A. For this reason, in removal of a monocrystalline Si substrate 14 from a multilayer board 61, where an etching solution permeates between polyimide 72 and laminate 60, the etching solution circumvents the electrode film 46A before it reaches the piezoelectric film 52A. Namely, a route A of the etching solution to the piezoelectric film 52A is significantly extended by the electrode film 46A. In the method of making the electronic device 74, therefore, the etching solution is less likely to reach the piezoelectric film 52A.

Abstract: The invention relates to a piezoelectric thin film vibrator having a piezoelectric device formed by using thin film formation technology, a fabrication method thereof, a driving apparatus and a piezoelectric motor using the same, and an object is to provide a piezoelectric thin film vibrator which can provide an excellent piezoelectric characteristic at low cost, a fabrication method thereof, a driving apparatus and a piezoelectric motor using the same. A piezoelectric thin film vibrator is configured to have a resonator which generates a flexure traveling wave, a lower electrode which is formed on the resonator, a piezoelectric thin film which is formed by epitaxial growth on the lower electrode, and a plurality of upper electrode parts which is formed on the piezoelectric thin film.

Abstract: An angular velocity sensor element is provided which is capable of preventing even transmission of sudden externally-applied vibration to an element portion by absorbing the vibration. An angular velocity sensor element 2 according to the present embodiment has a fixing portion 21 in the form of a frame, an element portion 20 disposed in the frame of the fixing portion 21 and having vibrating arms 21 to 24 in a drive system and a detection system, and a connecting portion 25 formed as a fixed-fixed beam having its both ends connected to the fixing portion 21 and having its intermediate portion connected to the element portion 20.

Abstract: An angular velocity sensing element is provided, which is able to prevent breakage of an oscillation arm even when an excessively large shock is given. An angular velocity sensing element 2 according to the present embodiment includes oscillation arms 22, 23 and 24 formed of a semiconductor material, and a stopper member provided to limit the oscillation range of the oscillation arms. As such a stopper member, a first stopper member 25 is provided, for example, which limits the oscillation range of the oscillation arms at least within a single plane of the arms. Fixing portions 21, the oscillation arms 22, 23 and 24 and the first stopper member 25 are integrally formed by processing a semiconductor material, such as silicon.

Abstract: Provided is a horizontally located sensitive angular velocity sensor capable of easily eliminating influence of acceleration in a lateral direction and whose fixed section is easily fixed. The angular velocity sensor includes a pair of fixed sections fixed on a top of an sensor support section of a case, a detection arm extending along a plane parallel to the sensor support section, and a pair of upper drive arm and lower drive arm extending along the plane parallel to the sensor support section and extending in a direction opposite to each other so as to intersect an extending direction of the detection arm.

Abstract: The present invention provides an angular velocity sensor in which higher sensitivity for sensors is available even with a smaller base portion. The angular velocity sensor includes a fixed portion fixed to the top surface of a sensor element supporting portion of a casing, an upper detection arm and a lower detection arm, each of them being connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the top surface of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion in such a manner as to form a pair of arms with the upper detection arm in between and extending in a direction parallel to the extending direction of the upper detection arm.

Abstract: An angular velocity sensor of a horizontally located type, in which influence of a translational acceleration applied thereto from a lateral direction is readily removed and a fixed portion thereof is easily fixed, is provided. It includes a fixed portion fixed to the top surface of a sensor element supporting portion of a casing, an upper detection arm portion and a lower detection arm portion respectively connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the top surface of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion with the upper detection arm portion in between. The fixed portion includes one or more slits extending at least in a direction intersecting with the extending direction of the upper detection arm portion.