Abstract: A multilayer body, a multilayer hollow body, and a catheter with a multilayer hollow body each have improved torque transmissibility to one end when the other end is rotated rightward or leftward. The multilayer hollow body includes a single-strand hollow body that is formed by winding one element wire, an inner multi-strand hollow body that is disposed adjacently to an inner periphery of the single-strand hollow body and is formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body, and an outer multi-strand hollow body that is disposed adjacently to an outer periphery of the single-strand hollow body 7 and is formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body.

Abstract: A shaft assembly for an in vivo recovery mechanism is provided with a shaft, and a side wire sparsely wound onto the outer circumference of the shaft and having protruding and recessed parts on the outer circumferential surface thereof. Therefore, when rotating the shaft assembly as part of an in vivo recovery mechanism, a substance in the body is caught between the sparsely wound side wire on the shaft and held by the protruding and recessed parts formed on the side wire, whereby performance for recovering and transporting the substance in the body can be improved.

Abstract: A multilayer body, a multilayer hollow body, and a catheter with a multilayer hollow body each have improved torque transmissibility to one end when the other end is rotated rightward or leftward. The multilayer hollow body includes a single-strand hollow body that is formed by winding one element wire, an inner multi-strand hollow body that is disposed adjacently to an inner periphery of the single-strand hollow body and is formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body, and an outer multi-strand hollow body that is disposed adjacently to an outer periphery of the single-strand hollow body 7 and is formed by winding a plurality of element wires in an opposite direction from the single-strand hollow body.

Abstract: An optical head device including a lens holder which holds an objective lens, six wires for supporting the lens holder and a holder support member which movably supports the lens holder by the six wires in a tracking, focusing and tilt direction. The six wires comprise two pairs, each of the pairs comprising a composite wire composed of two wires and a single wire composed of one wire which are respectively disposed on an upper side and a lower side of the lens holder in the focusing direction. The spring constant of the composite wire is set to be approximately equal to a spring constant of the single wire. Alternatively, the six wires may be disposed on the same circumference with respect to a drive center in the tilt direction or the spring constant of one wire of the pair may be set to be smaller than spring constants of the other two wires of the pair.

Abstract: An objective lens driving device is to be improved in sensitivity and reduced in size and thickness. To this end, an objective lens driving device includes a stationary block arranged on a stationary plate provided on a movable base, a movable block holding an objective lens and moved along the focusing direction, the tracking direction and the tilt direction, support springs for supporting the movable block with respect to the stationary block, a first magnetic circuit for causing movement of the movable block along the focusing direction and along the tracking direction, and a second magnetic circuit for causing movement of the movable block along the tilt direction. The second magnetic circuit includes a pair of tilt magnets, each having two poles so that N poles and S poles lie along the tangential direction, and a pair of tilt coils facing the tilt magnets and each having an axis of winding wire direction along the tangential direction.

Abstract: An optical head device including a lens holder which holds an objective lens, six wires for supporting the lens holder and a holder support member which movably supports the lens holder by the six wires in a tracking, focusing and tilt direction. The six wires comprise two pairs, each of the pairs comprising a composite wire composed of two wires and a single wire composed of one wire which are respectively disposed on an upper side and a lower side of the lens holder in the focusing direction. The spring constant of the composite wire is set to be approximately equal to a spring constant of the single wire. Alternatively, the six wires may be disposed on the same circumference with respect to a drive center in the tilt direction or the spring constant of one wire of the pair may be set to be smaller than spring constants of the other two wires of the pair.