Abstract: A high-frequency treatment instrument including: a sheath formed of a flexible material; an electrode member disposed inside the sheath; a distal-end member having a through-hole through which the electrode member passes; and a liquid supply means supplying liquid towards the front side via a flow path in the sheath, wherein the electrode member includes a rod-shaped electrode portion movably passing through the through-hole, and a large-diameter portion provided at the distal end thereof to have an outer diameter larger than the diameter of the through-hole, the large-diameter portion includes an electrode hole passing therethrough, between the distal-end member and the large-diameter portion, there is provided a buffer member that seals the periphery of a space between the distal-end member and the large-diameter portion.

Abstract: A high-frequency treatment instrument including: a sheath formed of a flexible material; an electrode member disposed inside the sheath; a distal-end member having a through-hole through which the electrode member passes; and a liquid supply means supplying liquid towards the front side via a flow path in the sheath, wherein the electrode member includes a rod-shaped electrode portion movably passing through the through-hole, and a large-diameter portion provided at the distal end thereof to have an outer diameter larger than the diameter of the through-hole, the large-diameter portion includes an electrode hole passing therethrough, between the distal-end member and the large-diameter portion, there is provided a buffer member that seals the periphery of a space between the distal-end member and the large-diameter portion.

Abstract: An ultrasonic motor is configured as follows. Namely, the ultrasonic motor includes a vibrator, a rotor, a press mechanism, a frame, and a regulating unit. The vibrator's section perpendicular to a central axis has a rectangular shape, in which a ratio of a short side to a long side that form the rectangular shape is set to a predetermined value. And the vibrator generates an elliptic vibration by simultaneously exciting a longitudinal vibration stretching along the central axis, and a torsional vibration. The rotor mechanism abuts against an elliptic vibration generating surface of the vibrator and is driven by the elliptic vibration to rotate using the central axis as an axis of rotation. The press mechanism presses the vibrator against the rotor mechanism. The frame supports the rotor mechanism and the vibrator. The regulating unit regulates rotation of the vibrator by clamping the vibrator together with the frame.

Abstract: An ultrasonic motor, which drives a driven member using an elliptical vibration produced by synthesizing a longitudinal vibrational mode and a flexural vibrational mode as a drive force, is configured as follows. Namely, the ultrasonic motor includes a piezoelectric device, and a feed member feeding the piezoelectric device. An extensional axis of the feed member is set to an axis different from main vibrational axes of the longitudinal vibrational mode and the flexural vibrational mode.

Abstract: A driving apparatus has a piezoelectric element as a driver. The driving apparatus includes a first vibrator which generates an elliptical vibration when a voltage of a predetermined frequency is applied; a first member which holds the first vibrator; a second member which includes a first sliding member to which the first vibrator is pressed and makes a relative displacement with respect to the first member by being driven by the elliptical vibration of the first vibrator; and a first resonance preventive member which is provided to the second member and prevents a resonance in the second member from being generated by the elliptical vibration of the first vibrator.

Abstract: An ultrasonic motor, which drives a driven member using an elliptical vibration produced by synthesizing a longitudinal vibrational mode and a flexural vibrational mode as a drive force, is configured as follows. Namely, the ultrasonic motor includes a piezoelectric device, and a feed member feeding the piezoelectric device. An extensional axis of the feed member is set to an axis different from main vibrational axes of the longitudinal vibrational mode and the flexural vibrational mode.

Abstract: A driving apparatus has a piezoelectric element as a driver. The driving apparatus includes a first vibrator which generates an elliptical vibration when a voltage of a predetermined frequency is applied; a first member which holds the first vibrator; a second member which includes a first sliding member to which the first vibrator is pressed and makes a relative displacement with respect to the first member by being driven by the elliptical vibration of the first vibrator; and a first resonance preventive member which is provided to the second member and prevents a resonance in the second member from being generated by the elliptical vibration of the first vibrator.

Abstract: The invention provides an ultrasonic driving apparatus in which an oscillator contained therein is pressed against a driven member and can be positioned with a high degree of precision. The invention includes an oscillator for generating vibrations when supplied with electrical power; a holding member fixed to the oscillator; an urging member for urging the oscillator in a predetermined direction; and a support member for supporting the holding member so as to be capable of moving in the predetermined direction, wherein positioning portions for setting, with a certain degree of precision, the position of the oscillator which is projected onto a plane substantially orthogonal to the predetermined direction are provided in the holding member and the support member.

Abstract: An optical unit includes a first unit formed by accommodating, in a first case, an optical member which receives a light beam from an object, a light amount adjustment mechanism to adjust the amount of the light beam, and a light amount adjustment actuator unit constituted by integrating first and second actuators that drive the light amount adjustment mechanism, and a second unit formed by accommodating, in a second case, a lens group which is movably arranged to obtain a predetermined object image from the light beam, and a lens driving actuator unit which is mainly constituted by a stepping motor having a stacked stator core to drive the lens group. The first and second units can detachably be coupled through a coupling unit provided between the first case and the second case.

Abstract: The vibration wave motor of the present invention comprises a body to be driven, and a plurality of vibrators each of which is provided with a drive contact part contacting the outer surface of the body to be driven, is connected to a base and is disposed around the body to be driven. The base and the body to be driven are reciprocally driven linearly in a state where the longitudinal direction of the vibrator and the driven direction of the body to be driven are matched.

Abstract: The present invention comprises a first vibrator comprising a piezoelectric unit and at least one driving contacting part which vibrates by applying a predetermined voltage thereto, a second vibrator which comprises a piezoelectric unit and a plurality of driving contacting parts which vibrate by applying a predetermined voltage thereto, a pressing component which relatively presses the opposing parts of both the first vibrator and the second vibrator, and a driven component which is sandwiched between the first and second vibrators, in contact with the driving contacting part of the first and second vibrators which are pressed by the pressing component, and supported to enable movement with respect to the first and second vibrators in the long-side direction perpendicular to the direction relative to the opposing part.

Abstract: The vibration wave linear motor of the present invention is structured comprising a driven component, a first vibrator having two or more driving contacting parts for driving the driven component in a certain predetermined direction, a second vibrator having one or more driving contacting parts for driving the driven component in the same direction as the drive by the first vibrator, a first supporting part for fixing and holding either one of the first or second vibrators, a second supporting part for holding the other of either the first or second vibrator such that swinging is possible, and a pressing component for pressing the first or second vibrator which is held by the second supporting part, such as to enable swinging, to the driven component.

Abstract: The invention provides an ultrasonic driving apparatus in which an oscillator contained therein is pressed against a driven member and can be positioned with a high degree of precision. The invention includes an oscillator for generating vibrations when supplied with electrical power; a holding member fixed to the oscillator; an urging member for urging the oscillator in a predetermined direction; and a support member for supporting the holding member so as to be capable of moving in the predetermined direction, wherein positioning portions for setting, with a certain degree of precision, the position of the oscillator which is projected onto a plane substantially orthogonal to the predetermined direction are provided in the holding member and the support member.

Abstract: The vibration wave motor of the present invention comprises a body to be driven, and a plurality of vibrators each of which is provided with a drive contact part contacting the outer surface of the body to be driven, is connected to a base and is disposed around the body to be driven. The base and the body to be driven are reciprocally driven linearly in a state where the longitudinal direction of the vibrator and the driven direction of the body to be driven are matched.

Abstract: The vibration wave linear motor of the present invention is structured comprising a driven component, a first vibrator having two or more driving contacting parts for driving the driven component in a certain predetermined direction, a second vibrator having one or more driving contacting parts for driving the driven component in the same direction as the drive by the first vibrator, a first supporting part for fixing and holding either one of the first or second vibrators, a second supporting part for holding the other of either the first or second vibrator such that swinging is possible, and a pressing component for pressing the first or second vibrator which is held by the second supporting part, such as to enable swinging, to the driven component.

Abstract: The present invention comprises a first vibrator comprising a piezoelectric unit and at least one driving contacting part which vibrates by applying a predetermined voltage thereto, a second vibrator which comprises a piezoelectric unit and a plurality of driving contacting parts which vibrate by applying a predetermined voltage thereto, a pressing component which relatively presses the opposing parts of both the first vibrator and the second vibrator, and a driven component which is sandwiched between the first and second vibrators, in contact with the driving contacting part of the first and second vibrators which are pressed by the pressing component, and supported to enable movement with respect to the first and second vibrators in the long-side direction perpendicular to the direction relative to the opposing part.

Abstract: An optical unit includes a first unit formed by accommodating, in a first case, an optical member which receives a light beam from an object, a light amount adjustment mechanism to adjust the amount of the light beam, and a light amount adjustment actuator unit constituted by integrating first and second actuators that drive the light amount adjustment mechanism, and a second unit formed by accommodating, in a second case, a lens group which is movably arranged to obtain a predetermined object image from the light beam, and a lens driving actuator unit which is mainly constituted by a stepping motor having a stacked stator core to drive the lens group. The first and second units can detachably be coupled through a coupling unit provided between the first case and the second case.

Abstract: A hydrodynamic bearing according to the present invention comprises a rotary shaft having a convex portion provided at one end portion thereof, a sleeve which rotatably supports the rotary shaft, and having herringbone grooves formed in an inner wall thereof at positions, a thrust bearing which is provided in contact with an end portion of the rotary shaft on the convex portion side and restricts movement of the thrust bearing or the rotary shaft in an axial direction thereof, and a lubricant sealed in a space surrounded by the rotary shaft, the sleeve and the thrust bearing.

Abstract: A hydrodynamic bearing device of a shaft, a sleeve rotatably supporting this shaft, wherein a herringbone groove is formed at a predetermined part of an inner periphery wall face of the sleeve, and, a thrust receiver supporting a thrust side of the shaft fixed to a lower face of the sleeve, thereby sealing predetermined lubricant, wherein a spiral groove which is narrower in groove width and shallower in depth than the herringbone groove, and which is oriented to the thrust receiver in a rotation direction of the shaft, is formed on inner periphery wall face of the sleeve.

Abstract: A hydrodynamic bearing according to the present invention comprises a rotary shaft having a convex portion provided at one end portion thereof, a sleeve which rotatably supports the rotary shaft, and having herringbone grooves formed in an inner wall thereof at positions, a thrust bearing which is provided in contact with an end portion of the rotary shaft on the convex portion side and restricts movement of the thrust bearing or the rotary shaft in an axial direction thereof, and a lubricant sealed in a space surrounded by the rotary shaft, the sleeve and the thrust bearing.