Abstract: Each second rivet hole has an inner periphery constituted by a cylindrical shear surface having a constant inner diameter that does not axially change; and a tapered fracture surface gradually radially expanding from the shear surface toward an abutment surface.

Abstract: A centrifugal compressor including: a diffuser in which a fluid flows in a centrifugal direction away from a rotary shaft; a return flow path which is provided downstream of the diffuser and in which fluid flowing in to a later-stage centrifugal impeller from the diffuser flows in a return direction back to the rotary shaft; a plurality of return vanes that are disposed in the shape of a circular vane centered on a centerline of the rotary shaft, and are installed in the return flow path; and a turning part, wherein an inlet blade angle (?) of an outlet guide vane provided to the downstream side, of the return vanes, is lying down more in the circumferential direction with respect to an inlet blade angle (?) of a inlet guide vane provided to the upstream side, of the return vanes (?<?).

Abstract: A multistage centrifugal compressor capable of maintaining and improving efficiency while having a static flow path with a reduced outer diameter is provided. Each of return flow paths is provided with a plurality of return vanes disposed in a circular cascade form centered on a center line of a rotational shaft. Each of the return vanes is disposed as a leading vane (8A) and a trailing vane (8B). The trailing vanes are offset toward the pressure surface side of the leading vanes in a circumferential direction and provided so as to guide a flow from the pressure surface side of the leading vanes to negative pressure surfaces of the trailing vanes.

Abstract: A biometric information measurement device includes: a layered film including a plurality of layered layers including two or more types of layers having different refractive indices; and a light receiving element configured to receive light transmitted through the layered film and generate a signal corresponding to the light.

Abstract: A biological information acquisition device includes a near-infrared light source, a solid-state image sensor, and an information processing device, wherein the solid-state image sensor includes at least one specific pixel having a sensitivity peak in a specific wavelength band of 620 nm or more and 1100 nm or less, the information processing device is configured to repeatedly acquire (i) an emission image frame captured by the solid-state image sensor during an emission period of the near-infrared light source and (ii) a non-emission image frame captured by the solid-state image sensor during a non-emission period of the near-infrared light source, and the information processing device is configured to derive biological information on the basis of the emission image frame and the non-emission image frame.

Abstract: A solid-state imaging element includes: a plurality of first pixel output lines connected respectively to the plurality of first pixels; and a plurality of second pixel output lines connected respectively to the plurality of second pixels, wherein the plurality of first pixel output lines include a first closest pixel output line located closest to the plurality of second pixel output lines, the plurality of second pixel output lines include a second closest pixel output line located closest to the plurality of first pixel output lines, the first closest pixel output line is connected to a first pixel included in the plurality of first pixels, and the second closest pixel output line is connected to a second pixel included in the plurality of second pixels and disposed in the same pixel row as a pixel row that includes the first pixel.

Abstract: A biometric information acquiring apparatus that acquires biometric information of a living body, the biometric information acquiring apparatus includes: a light-receiving element configured to receive light arriving from the living body and generate a light reception signal; and an analysis device configured to analyze the light reception signal, wherein the light-receiving element includes a first light-receiving element configured to receive first light having an intensity peak in a first wavelength band of 620 nm or more and 740 nm or less, and the light-receiving element further includes at least one of (i) a second light-receiving element configured to receive second light having an intensity peak in a second wavelength band of 370 nm or more and 600 nm or less, or (ii) a third light-receiving element configured to receive third light having an intensity peak in a third wavelength band of 760 nm or more and 1100 nm or less.

Abstract: A multistage centrifugal compressor capable of maintaining and improving efficiency while having a static flow path with a reduced outer diameter is provided. Each of return flow paths is provided with a plurality of return vanes disposed in a circular cascade form centered on a center line of a rotational shaft. Each of the return vanes is disposed as a leading vane (8A) and a trailing vane (8B). The trailing vanes are offset toward the pressure surface side of the leading vanes in a circumferential direction and provided so as to guide a flow from the pressure surface side of the leading vanes to negative pressure surfaces of the trailing vanes.

Abstract: In the centrifugal compressor, the return channel is provided between a hub-side wall surface and a shroud-side wall surface. The return channel includes a front set of vanes arranged in a circular array on the upstream side and a rear set of vanes arranged in a circular array on the downstream side. The front set of vanes and the rear set of vanes are both formed on the shroud-side wall surface. The front set of vanes is formed on an annular member that is formed separately from the rear set of vanes. The annular member is fitted to the return channel. According to the above, it is possible to improve the tangential velocity component removal ability of front and rear vanes provided in the return channel of a centrifugal compressor.

Abstract: A centrifugal compressor including: a diffuser in which a fluid flows in a centrifugal direction away from a rotary shaft; a return flow path which is provided downstream of the diffuser and in which fluid flowing in to a later-stage centrifugal impeller from the diffuser flows in a return direction back to the rotary shaft; a plurality of return vanes that are disposed in the shape of a circular vane centered on a centerline of the rotary shaft, and are installed in the return flow path; and a turning part, wherein an inlet blade angle (?) of an outlet guide vane provided to the downstream side, of the return vanes, is lying down more in the circumferential direction with respect to an inlet blade angle (?) of a inlet guide vane provided to the upstream side, of the return vanes (?<?).

Abstract: A hydraulic auto-tensioner includes a rod inserted in a cylinder having a bottom and containing hydraulic oil, and a hydraulic damper in the cylinder for damping the push-in force that tends to push the cylinder and the rod in the direction in which the rod is pushed into the cylinder. An oil seal including a dust lip on the inner periphery thereof seals an open end of the cylinder. A rose-shaped snap ring is formed integral with the oil seal.

Abstract: A hydraulic auto-tensioner includes a rod inserted in a cylinder having a bottom and containing hydraulic oil, and a hydraulic damper in the cylinder for damping the push-in force that tends to push the cylinder and the rod in the direction in which the rod is pushed into the cylinder. An oil seal including a dust lip on the inner periphery thereof seals an open end of the cylinder. A rose-shaped snap ring is formed integral with the oil seal.