Abstract: A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. The lens unit includes a first tilt-preventing member having a linear expansion coefficient lower than a linear expansion coefficient of the lens holding member. The first tilt-preventing member is fixed to a region of the guided portion positioned between the first bearing portion and second bearing portion.

Abstract: A drive device includes a magnetic circuit unit including a first yoke, a second yoke, and a first magnet, a magnetic circuit unit including the first yoke, the second yoke, a second magnet, a first coil that is bonded to a focus lens, in which the magnetic circuit units drive the first coil and the focus lens by an electromagnetic force generated in the first coil, the first magnet corresponds to a first movement amount of movement of the focus lens, and the second magnet corresponds to a second movement amount of movement of the focus lens.

Abstract: A lens driving mechanism includes first and second piezoelectric rods that move a lens and first and second sensors that detect a position of the lens. An angle formed between a line (a first piezoelectric line) that extends from the first piezoelectric rod to be perpendicular to an optical axis and a line (a first sensor line) that extends from the first sensor to be perpendicular to the optical axis is smaller than 90°. An angle formed between a line (a second piezoelectric line) that extends from the second piezoelectric rod to be perpendicular to the optical axis and a line (a second sensor line) that extends from the second sensor to be perpendicular to the optical axis is smaller than 90°.

Abstract: A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. The lens unit includes a first tilt-preventing member having a linear expansion coefficient lower than a linear expansion coefficient of the lens holding member. The first tilt-preventing member is fixed to a region of the guided portion positioned between the first bearing portion and second bearing portion.

Abstract: A control method used in a system including a moving body and an imaging apparatus includes an acquisition step of acquiring factor information, including movement information related to the moving body, via the imaging apparatus, an adjustment step of adjusting a position of a moving mechanism that moves an image sensor or an imaging lens provided in the imaging apparatus, based on the factor information, an imaging step of imaging a subject by using the image sensor after the adjustment step is executed, and a correction step of correcting a shake applied to the image sensor or the imaging lens by using the moving mechanism in a case in which the imaging step is executed.

Abstract: A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. A first distance between the center of a fixing portion of the lens holding member and the center of the first bearing portion in the direction X is set to be longer than a second distance between the center of the fixing portion and the center of the second bearing portion in the direction X. A first tilt-preventing member having a linear expansion coefficient lower than that of the lens holding member is fixed to a region, which is closer to the first bearing portion than the center of the fixing portion, of a portion of the guided portion positioned between the first and second bearing portions.

Abstract: Provided are a lens barrel and an imaging device, with which it is possible to lock an optical member of which the movement in an optical axis direction is made free in a case where there is no electrification, particularly to hold the optical member in a locked state without use of electric power. A movable frame that holds a focus lens is driven in the optical axis direction by a linear motor. In a case where the movable frame is to be locked with the linear motor being not electrified, the movable frame (engagement portion) is caused to abut onto a restriction portion at an end portion of the movable range of the movable frame and a locking ring is caused to rotationally move to a locking position by an electric actuator. Accordingly, the movable frame is fixed by the restriction portion and a locking portion of the locking ring to become unable to move.

Abstract: A lens barrel including a first main shaft and a first sub-shaft that guide the movement of a third front lens group (G3a), a second main shaft and a second sub-shaft that guide the movement of a fourth lens group (G4), a hall element that is used to detect the position of the third front lens group (G3a), and an MR sensor that is used to detect the position of the fourth lens group (G4) are disposed on a straight line passing through an optical axis in a cross section orthogonal to the optical axis. The first main shaft and the second main shaft overlap each other in a direction of the optical axis. In a drive unit for each lens group, a plurality of drive magnets are arranged symmetrically with respect to the straight line.

Abstract: A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. A first distance between the center of a fixing portion of the lens holding member and the center of the first bearing portion in the direction X is set to be longer than a second distance between the center of the fixing portion and the center of the second bearing portion in the direction X. A first tilt-preventing member having a linear expansion coefficient lower than that of the lens holding member is fixed to a region, which is closer to the first bearing portion than the center of the fixing portion, of a portion of the guided portion positioned between the first and second bearing portions.

Abstract: There is provided a lens barrel that can stably support movable lens groups with compact configuration and accurately detect the positions of the movable lens groups. A first main shaft (48) and a first sub-shaft (50) that guide the movement of a third front lens group (G3a), a second main shaft (58) and a second sub-shaft (60) that guide the movement of a fourth lens group (G4), a hall element (84) that is used to detect the position of the third front lens group (G3a), and an MR sensor (94B) that is used to detect the position of the fourth lens group (G4) are disposed on a straight line passing through an optical axis (Z) in a cross section orthogonal to the optical axis (Z). The first main shaft (48) and the first sub-shaft (50) are disposed on the radially inner side than the second main shaft (58) and the second sub-shaft (60). The first main shaft (48) and the second main shaft (58) are disposed so as to overlap each other in a direction of the optical axis.

Abstract: Provided are a lens barrel and an imaging device, with which it is possible to lock an optical member of which the movement in an optical axis direction is made free in a case where there is no electrification, particularly to hold the optical member in a locked state without use of electric power. A movable frame that holds a focus lens is driven in the optical axis direction by a linear motor. In a case where the movable frame is to be locked with the linear motor being not electrified, the movable frame (engagement portion) is caused to abut onto a restriction portion at an end portion of the movable range of the movable frame and a locking ring is caused to rotationally move to a locking position by an electric actuator. Accordingly, the movable frame is fixed by the restriction portion and a locking portion of the locking ring to become unable to move.

Abstract: An optical fiber guides light output from a light source to an ultrasound probe. The ultrasound probe includes a light guiding section that guides the light from a light input end, which is optically coupled with the optical fiber to a light output end provided in the vicinity of ultrasonic transducers. The light guiding section has a first light guiding portion that includes the light input end, and a second light guiding portion that includes the light output end. The first light guiding portion is formed by glass, and magnifies input light. The second light guiding portion is formed by resin, and emits the light toward a subject from the light output end.

Abstract: In an acoustic image generation apparatus with a probe having an ultrasonic transducer, providing a scanning length setting part that sets a target scanning length in a scanning process of the probe, a coordinate obtaining part that sequentially obtains a coordinate of the probe in real space, a scanned length calculation part that calculates a scanned length based on the coordinate obtained by the coordinate obtaining part, a progress level display generation part that generates a progress level display that indicates progress of the scanning process based on the target scanning length and the scanned length, and a display part that displays the progress level display.

Abstract: The light irradiation range of a probe for a photoacoustic measurement apparatus is increased. The probe for a photoacoustic measurement apparatus includes a light transmission unit that irradiates a subject with light, and a photoacoustic wave detector 52 that detects a photoacoustic wave generated from the subject. The light transmission unit includes light propagation part 51 for propagating light, and a light transmission member 55. Further, the light transmission member 55 includes an inner peripheral surface 55a that is formed in the shape of a curved concave surface and an outer peripheral surface 55b that has a radius of curvature larger than the radius of curvature of the inner peripheral surface 55a and is formed in the shape of a curved convex surface. The outer peripheral surface 55b is disposed so that the light L emitted from the light propagation part 51 is incident on the inner peripheral surface 55a.

Abstract: An acoustic wave detector that detects an acoustic wave from a subject, an optical fiber that guides light emitted from a light source to a probe body, and a light guide member that guides light from a light entrance end, which is optically coupled to the optical fiber, to a light exit end, which is located in the vicinity of the acoustic wave detector, are provided. The light guide member is secured in the probe body with a securing material provided at least partially around the light guide member. The conditional expression below is satisfied: sin?1(n2/n1)×(180°/?)<90°??i where n1 is a refractive index of the light guide member, n2 is a refractive index of the securing material, and ?i is a spread angle of incoming light from the optical fiber.

Abstract: An optical fiber guides light output from a light source to an ultrasound probe. The ultrasound probe includes a light guiding section that guides the light from a light input end, which is optically coupled with the optical fiber to a light output end provided in the vicinity of ultrasonic transducers. The light guiding section has a first light guiding portion that includes the light input end, and a second light guiding portion that includes the light output end. The first light guiding portion is formed by glass, and magnifies input light. The second light guiding portion is formed by resin, and emits the light toward a subject from the light output end.

Abstract: An optical fiber guides light output from a light source to an ultrasound probe. The ultrasound probe includes a light guiding section that guides the light from a light input end, which is optically coupled with the optical fiber to a light output end provided in the vicinity of ultrasonic transducers. The light guiding section has a first light guiding portion that includes the light input end, and a second light guiding portion that includes the light output end. The first light guiding portion is formed by glass, and magnifies input light. The second light guiding portion is formed by resin, and emits the light toward a subject from the light output end.

Abstract: An object of the invention is to reduce the size of a probe for a photoacoustic measurement device. A light guide 71 is arranged such that one of a two side surfaces 71a is closer to a probe axis C which faces a subject than the other side surface and a light emission end surface 71c is closer to the probe axis C than a light incident end surface 71b when the probe is used. When a refractive index of the light guide 71 with respect to the light is n1 and a refractive index of a medium around the light guide with respect to the light during photoacoustic measurement is n2 (n2<n1), the light emission end surface 71c is obliquely formed such that an angle ?[°] (where 90°?arcsin(n2/n1)<?<90°) is formed between the light emission end surface 71c and the side surface 71a.

Abstract: An acoustic wave detector that detects an acoustic wave from a subject, an optical fiber that guides light emitted from a light source to a probe body, and a light guide member that guides light from a light entrance end, which is optically coupled to the optical fiber, to a light exit end, which is located in the vicinity of the acoustic wave detector, are provided. The light guide member is secured in the probe body with a securing material provided at least partially around the light guide member. The conditional expression below is satisfied: sin?1(n2/n1)×(180°/?)<90°??i where n1 is a refractive index of the light guide member, n2 is a refractive index of the securing material, and ?i is a spread angle of incoming light from the optical fiber.

Abstract: An acoustic wave detector that detects an acoustic wave from a subject, an optical fiber that guides light emitted from a light source to a probe body, and a light guide member that guides light from a light entrance end, which is optically coupled to the optical fiber, to a light exit end, which is located in the vicinity of the acoustic wave detector, are provided. The light guide member is secured in the probe body with a securing material provided at least partially around the light guide member. The conditional expression below is satisfied: sin?1(n2/n1)×(180°/?)<90°??i where n1 is a refractive index of the light guide member, n2 is a refractive index of the securing material, and ?i is a spread angle of incoming light from the optical fiber.