Abstract: The steel material includes a chemical composition containing, in mass %, C: 0.15 to 0.45%, Si: 0.50% or less, Mn: 0.20 to 0.60%, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfying Formula (1) to Formula (4) described in Embodiment, wherein, in its microstructure, a total area fraction of ferrite and pearlite is 10.0% or more, and a proportion of a content of V (mass %) in electrolytic extraction residue to the content of V (mass %) in the chemical composition is 10.0% or less.

Abstract: A gyrocompass includes: a binnacle; a gyro case having a gyro rotor; a vertical ring mounted on the binnacle for rotation about a vertical axis, the vertical axis extending perpendicular to a gimbal axis and a horizontal axis, the gimbal axis extends in a direction of a spin axis of the gyro rotor and the horizontal axis extends perpendicular to the gimbal axis and parallel to a horizontal plane; a horizontal ring supported by the vertical ring for rotation about the gimbal axis and supporting the gyro case for rotation about the horizontal axis or supported by the vertical ring for rotation about the horizontal axis and supporting the gyro case for rotation about the gimbal axis; a horizontal servo motor for rotating the gyro case about the horizontal axis; and an azimuth servo motor mounted on the vertical ring for rotating the vertical ring about the vertical axis.

Abstract: A crankshaft with improved seizure resistance is provided. A crankshaft (10) is a crankshaft including journals (11) and pins (12), having a chemical composition of, in mass %: 0.35 to 0.40 % C; up to 0.70 % Si; 1.00 to 2.00 % Mn; up to 0.50 % Cr; up to 0.050 % Al; up to 0.020 % N; up to 0.020 % P; 0.005 to 0.200 % S; and balance Fe and impurities, each of the journals (11) and pins (12) having a surface microstructure containing tempered martensite in not less than 80 volume % and a surface hardness not higher than HV 450.

Abstract: A piston ring includes a plurality of first ring pieces placed inside the ring groove in a stacking manner such that the first ring pieces adhere to each other in the axis direction. The first ring pieces include respective piston ring gap portions each having end surfaces separated from each other in the circumferential direction of the first ring pieces such that the end surfaces face each other via a ring gap having a predetermined dimension. The respective piston ring gap portions of the first ring pieces are displaced from each other in the circumferential direction. A closing member is provided to close the piston ring gap portions of the first ring pieces in the radial direction of the first ring pieces.

Abstract: A resonator is engaged with an outer circumferential surface of a rim of a wheel so as to be fixed to the outer circumferential surface. The resonator includes a body including an elongated resonant space extending along the outer circumferential surface of the rim and includes an opening arranged at the body to connect, to an outside of the resonant space, at least one of two ends of the resonant space in an extension direction of the resonant space. The resonant space and the opening form a resonance tube.

Abstract: A cost calculation and payment device includes: a main body provided with a placement portion on which the user places merchandise items; a first camera for capturing an image of the merchandise items placed on the placement portion; a second camera for capturing an image of a face of the user; a controller for performing a process related to cost calculation by recognizing the merchandise items in question based on a merchandise item image acquired by image capture by the first camera and to perform a process related to face authentication based on a face image acquired by image capture by the second camera; and a display for displaying a cost calculation result and a payment result acquired by the controller, wherein the display is disposed in a vicinity of the placement portion, and the second camera captures an image of the face of the user looking at the display.

Abstract: A lens device includes a first lens system including a first lens, a second lens system including a second lens, a moving member configured to move in an optical axis direction of the first lens, and a physical structure configured to move the first lens in the optical axis direction and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens.

Abstract: A cost calculation and payment device includes: a main body provided with a placement portion on which merchandise items are placed; a first camera for capturing an image of the merchandise items placed on the placement portion; a second camera for capturing an image of a face of the user; a controller for performing a process related to cost calculation by recognizing the merchandise items in question based on a merchandise item image acquired by the first camera and to perform a process related to face authentication based on a face image acquired by the second camera; a display for displaying a cost calculation result and a payment result acquired by the controller, and a projector for projecting an image onto the placement portion, wherein the display is disposed in a vicinity of the placement portion.

Abstract: A lens device includes a first electric motor, a second electric motor, a lens, a cam ring, a first gear, a second gear, and a controller. The cam ring is configured to drive the lens in a direction of an optical axis of the lens. The first gear is configured to transmit power generated by the first electric motor to the cam ring. The second gear is configured to transmit power generated by the second electric motor to the cam ring. The controller is configured to, when controlling the cam ring to stop rotating, first stop a rotation of the first electric motor and then stop a rotation of the second electric motor.

Abstract: A carrier includes a stator configured to be coupled to a base support, a frame operably coupled to the stator via a plurality of piezoelectric actuators, and at least one inertial sensor attached to the frame. The stator includes a spherical surface. The frame is configured to rotate relative to the stator about one or more rotational axes. Rotation of the frame is effectuated via the plurality of piezoelectric actuators. The inertial sensor is configured to detect a motion of the frame.

Abstract: A lens apparatus includes a barrel configured to accommodate a plurality of lenses, a first ring arranged around the barrel and configured to rotate about an optical axis, a second ring arranged around the first barrel and configured to rotate about the optical axis and move together with the first ring between a first position and a second position in an optical axis direction, a friction member arranged between surfaces of the first and second rings facing each other and configured to generate a frictional force on the second ring to cause the second ring to rotate together with the first ring when the first and second rings are in the first position, and a resistance member configured to generate a resistance force on the second ring to prevent the second ring from rotating together with the first ring when the first and second rings are in the second position.

Abstract: A lens apparatus includes a first barrel, a first ring around the first barrel and configured to rotate about an optical axis, a second barrel arranged in the first barrel and configured to move between first and second positions in an optical axis direction, a cam ring around the first barrel and configured to rotate about the optical axis, a switching ring around the cam ring and configured to rotate about the optical axis together with the cam ring to switch the second barrel between the first and second positions, a rotation restraining member configured to limit a rotation of the first ring to first and second rotation angle ranges when the second barrel is in the first and second positions, respectively, and a circuit configured to control a drive mechanism based on a rotation angle of the first ring with respect to the first barrel.

Abstract: A control device includes a processor and a storage device. The storage device stores a program that, when executed by the processor, causes the processor to perform speed control to perform speed control to cause a speed of a lens of a camera device to reach a target speed, during the speed control, obtain a current value of a current provided to an electric motor of the camera device configured to drive the lens, determine a stop moment of stopping providing the current to the electric motor according to the current value, and control to stop providing the current to the electric motor at the stop moment to cause the lens to stop at a stop position.

Abstract: A light amount adjustment device includes a base member, a rotation member rotatably held with respect to the base member, and a light amount adjustment member engaged with the rotation member and configured to be driven by the rotation member to adjust an amount of passing light. The rotation member includes a first surface area in contact with the base member and a second surface area not in contact with the base member. A surface roughness of the first surface area is greater than a surface roughness of the second surface area.

Abstract: The present disclosure provides a control device for controlling an imaging device. The control device includes an operation unit configured to be operated by an external force; a detection unit configured to detect an operation state of the operation unit; a processor configured to execute a program to: perform a predetermined operation based on the operation state of the operation unit; and invalidate an execution of the predetermined operation performed by the processor based on the operation state of the operation unit when the imaging device is connected to an object satisfying a condition.

Abstract: A control device includes a processor and a storage device storing instructions that, when executed by the processor, cause the processor to determine a first rotation amount of a motor, configured to control a lens, from a time when the motor starts rotating to a time when a speed of the lens reaches a predetermined speed, in response to the speed of the lens reaching the predetermined speed, determine a second rotation amount of the motor from a time when the motor is instructed to stop rotating to a time when the lens stops, and control the motor so that the lens moves to a target position when the lens moves to a reference position with a distance to the target position of the lens greater than a distance corresponding to a third rotation amount, which is a sum of the first rotation amount and the second rotation amount.