Abstract: A power transmission device includes: a gear; a case receiving the gear; and a baffle plate positioned between the gear and the case; the baffle plate including a guide portion arranged to guide an oil scooped up by the gear, into between the baffle plate and the case, and the guide portion being disposed above an oil level within the case, the guide portion being adjacent to an axial side surface of the gear, the guide portion being positioned in the baffle plate on an upstream side in a rotation direction of the gear, and the guide portion including a first bent portion which is positioned on a tip end side, and which is bent in a direction from the case toward the gear.

Abstract: An inertial sensor, includes: a substrate; a fixing portion that is provided on the substrate; a first movable body that faces the substrate and that is displaceable with a first support beam as a first rotation axis; the first support beam that is arranged in a first direction and that couples the first movable body and the fixing portion; a second movable body that is displaceable due to deformation of a second support beam; the second support beam that is arranged in a second direction intersecting the first direction and that couples the first movable body and the second movable body; and a protrusion that is provided on the substrate or the second movable body, overlaps the second movable body in plan view from a third direction and that protrudes toward the second movable body or the substrate.

Abstract: A physical quantity sensor includes a substrate, a movable body that includes a movable drive electrode, a movable detection electrode, and a connection portion for connecting the movable drive electrode and the movable detection electrode and is allowed to vibrate along a first axis with respect to the substrate, a fixed drive electrode that is fixed to the substrate, is disposed to face the movable drive electrode, and vibrates the movable body along the first axis, and a fixed monitor electrode that is fixed to the substrate, is disposed to face the movable detection electrode and detects vibration of the movable body along the first axis.

Abstract: An acceleration sensor as a physical quantity sensor includes: a substrate; a correction electrode fixed to the substrate; a detection electrode fixed to the substrate; and a moving member fixed to the substrate. The moving member has: a base part; a first anchor part fixed to the substrate; a first finger electrode extending from the base part and facing the correction electrode; a mass part provided in such a way as to be displaceable in a direction of detection of a physical quantity in relation to the substrate; and a second finger electrode extending from the mass part and facing the detection electrode. A distance between a second anchor part where the detection electrode and the substrate are fixed, and the base part, is shorter than a distance between the second anchor part and the mass part.

Abstract: A method for manufacturing a fuel cell separator includes heating a sheet, pressing the sheet using a first die, thereby forming the sheet so as to have a predetermined thickness, cooling, together with the first die, the sheet that has been formed so as to have the predetermined thickness, and pressing the sheet that has undergone the cooling using a second die, thereby forming a gas passage in the sheet. In the sheet, a content of a thermoplastic resin is greater than or equal to 20 weight percent and less than or equal to 30 weight percent and a content of the carbon material particles is greater than or equal to 70 weight percent and less than or equal to 80 weight percent. The heating the sheet includes heating the sheet to a temperature that is higher than a melting point of the thermoplastic resin.

Abstract: An inertial sensor is an inertial sensor for detecting a physical quantity based on a displacement in a Z axis when defining three axes perpendicular to each other as an X axis, a Y axis, and the Z axis, and is provided with a substrate, a movable body which is fixed to the substrate, oscillates around an oscillation axis along the X axis, and has two planes opposed to each other and side surfaces connecting the two planes to each other, and a limiter which is fixed to the substrate, and is opposed to the side surfaces of the movable body, wherein the movable body is provided with a resilient portion in a portion opposed to the limiter.

Abstract: The inertial sensor includes a substrate, stationary electrodes provided to the substrate, an element section including a movable body which is displaceable with respect to the stationary electrodes, and which has electrodes in a first portion and a second portion opposed to the stationary electrodes, a protrusion which limits a displacement of the movable body, and which has a detection electrode in a portion opposed to the first portion of the movable body, a drive circuit for outputting a drive signal to the element section, a contact detection circuit for outputting a detection signal due to a contact between the electrode in the first portion of the movable body and the detection electrode of the protrusion, a self-diagnostic circuit for outputting a test signal to the element section when receiving the detection signal from the contact detection circuit, and a determination circuit for determining whether or not a level of a signal output by the element section in response to the test signal is out of a

Abstract: An angular velocity sensor includes a substrate, a detector including a movable detection electrode and a fixed detection electrode opposed to the movable detection electrode, and a driver adapted to drive the detector. The movable detection electrode is supported by a first spring that is elongated parallel to a Y axis from a first turned-back part, and a second spring that is elongated parallel to the Y axis from a second turned-back part. The first and second springs are fixed at first and second anchors. The first turned-back part is closer to the second spring than the first anchor. The detector includes a first surface opposed to the first spring, and a second surface disposed closer to the first spring than the first surface.

Abstract: An angular velocity sensor includes a substrate, a detector including a movable detection electrode and a fixed detection electrode opposed to the movable detection electrode, and a driver adapted to drive the detector. The movable detection electrode is supported by a first spring that is elongated parallel to a Y axis from a first turned-back part, and a second spring that is elongated parallel to the Y axis from a second turned-back part. The first and second springs are fixed at first and second anchors. The first turned-back part is closer to the second spring than the first anchor. The detector includes a first surface opposed to the first spring, and a second surface disposed closer to the first spring than the first surface.

Abstract: A physical quantity sensor includes a substrate provided with a first fixed electrode, a movable body provided to be swingable with respect to the substrate about a rotation axis along a Y axis, and a stopper restricting rotation of the movable body. The movable body is provided with an elastic portion at a position overlapping the stopper in a plan view viewed from the Z axis direction. The first mass portion includes a first region, and a second region far from the rotation axis. A first gap distance of a first gap between the first mass portion and the first fixed electrode in the first region is smaller than a second gap distance of a second gap between the first mass portion and the first fixed electrode in the second region.

Abstract: In an inertial sensor, a first movable body configured to swing around a first rotation axisrotation axis along a first direction has an opening; the opening includes a second movable body configured to swing around a second rotation axisrotation axis along a second direction, a second support beam supporting the second movable body as the second rotation axisrotation axis, a third movable body configured to swing around a third rotation axisrotation axis along the second direction, and a third support beam supporting the third movable body as the third rotation axisrotation axis; and a protrusion is provided at a surface facing the second movable body and the third movable body, or at the second movable body and the third movable body, the protrusion protruding toward the second movable body and the third movable body or the surface.

Abstract: An inertial sensor includes a substrate, a first supporting beam being a first rotation axis extending along a first direction, a first movable member swingable around the first rotation axis, a second supporting beam being a second rotation axis extending along a second direction crossing the first direction, a second movable member swingable around the second rotation axis, a third rotation axis extending along a second direction, a third movable member swingable around the third rotation axis, and a projection, wherein the second and third movable members are line-symmetrically placed with a center line of the first movable member along the second direction as an axis of symmetry, a center of gravity of the second movable member is closer to the center line than the second supporting beam, and a center of gravity of the third movable member is closer to the center line than the third supporting beam.

Abstract: The inertial sensor includes a substrate, stationary electrodes provided to the substrate, an element section including a movable body which is displaceable with respect to the stationary electrodes, and which has electrodes in a first portion and a second portion opposed to the stationary electrodes, a protrusion which limits a displacement of the movable body, and which has a detection electrode in a portion opposed to the first portion of the movable body, a drive circuit for outputting a drive signal to the element section, a contact detection circuit for outputting a detection signal due to a contact between the electrode in the first portion of the movable body and the detection electrode of the protrusion, a self-diagnostic circuit for outputting a test signal to the element section when receiving the detection signal from the contact detection circuit, and a determination circuit for determining whether or not a level of a signal output by the element section in response to the test signal is out of a

Abstract: A physical quantity sensor includes a drive vibrator, a detection vibrator, and an elastic deformation portion disposed between the drive vibrator and the detection vibrator and elastically deformable along a first axis in which the drive vibrator and the detection vibrator are aligned, in plan view, and in which the drive vibrator and the detection vibrator vibrate in reverse phases along the first axis. The drive vibrator and the detection vibrator vibrating alternately repeat approaching and separating from each other along the first axis.

Abstract: An inertial sensor, includes: a substrate; a fixing portion that is provided on the substrate; a first movable body that faces the substrate and that is displaceable with a first support beam as a first rotation axis; the first support beam that is arranged in a first direction and that couples the first movable body and the fixing portion; a second movable body that is displaceable due to deformation of a second support beam; the second support beam that is arranged in a second direction intersecting the first direction and that couples the first movable body and the second movable body; and a protrusion that is provided on the substrate or the second movable body, overlaps the second movable body in plan view from a third direction and that protrudes toward the second movable body or the substrate.

Abstract: A physical quantity sensor includes: a substrate; a movable object disposed displaceably with respect to the substrate; an electrode provided at a position facing the movable object on the substrate; an anchor portion fixing the movable object to the substrate; and a beam that is a rotation shaft of the movable object and connects the anchor portion and the movable object to each other, in which the movable object includes a first mass portion provided at one side of the beam, and a second mass portion provided at the other side of the beam, a first spring provided between the first mass portion and the beam, and a second spring provided between the second mass portion and the beam.

Abstract: A physical quantity sensor includes a first plate, and a second plate opposed to the first plate via a gap, wherein a sensing area in which the gap between the first plate and the second plate changing with a physical quantity is detected based on a change of a capacitance is disposed in an area where the first plate and the second plate overlap each other in a plan view, the first plate is provided with a through hole in the sensing area, and in a part of the second plate where the second plate overlaps the through hole of the first plate in the plan view, a distance from the second plate to an imaginary plane extending in a same plane as a surface of the first plate opposed to the second plate via the gap is longer than a distance of the gap.

Abstract: An inertial sensor unit includes a first inertial sensor and a second inertial sensor. The first inertial sensor has a first acceleration sensor element configured to detect an acceleration in a direction along the first axis, and a second acceleration sensor element configured to detect an acceleration in a direction along the second axis. The second inertial sensor has a third acceleration sensor element configured to detect an acceleration in a direction along the third axis, and a fourth acceleration sensor element configured to detect an acceleration in a direction along the first axis. The first acceleration sensor element, the second acceleration sensor element, the third acceleration sensor element, and the fourth acceleration sensor element have comb-tooth shaped detection electrodes.

Abstract: An inertial sensor includes a package that includes a substrate and a lid bonded to the substrate and has an internal space between the substrate and the lid and a sensor element accommodated in the internal space, and in which the lid has a through-hole causing an inside and an outside of the internal space to communicate with each other and sealed with a sealing member and the inertial sensor further includes a cylindrical first projection portion provided on the lid and surrounding an opening of the through-hole on the internal space side in plan view and a cylindrical second projection portion provided on the substrate and surrounding an outer periphery of the first projection portion in plan view.

Abstract: An inertial sensor according to an embodiment includes, when three axes orthogonal to one another are represented as an X axis, a Y axis, and a Z axis, a substrate, a movable body configured to swing around a swing axis extending along the Y axis, a fixed section configured to support the movable body and fixed to the substrate, and a stopper fixed to the substrate and configured to come into contact with the movable body to thereby restrict rotational displacement of the movable body around the Z axis. A stopper joining region where the stopper and the substrate are jointed is located, in a plan view from a direction along the Z axis, within a first region formed by extending the movable body in a direction along the Y axis, and a portion of the stopper located outside the first region is separated from the substrate.