Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: This housing is arranged to house therein at least a portion of an optical component and at least a portion of a rotary drive apparatus includes a motor arranged to rotate the optical component. The optical component is arranged to reflect incoming light coming from a light source or allow the incoming light to pass therethrough. The housing includes at least one tubular portion extending along a central axis extending in a vertical direction. The housing includes, at at least one axial position, one or more light source positioning portions each of which is arranged to be in contact with the light source in at least one of an axial direction, a radial direction, and a circumferential direction; and one or more motor positioning portions each of which is arranged to be in contact with the motor in at least one of the axial direction, the radial direction, and the circumferential direction.

Abstract: This casing unit includes a housing unit and a casing arranged to house therein at least a portion of the housing unit, the housing unit including a housing arranged to house therein at least a portion of a rotary drive apparatus arranged to cause incoming light coming from a light source to be emitted to an outside of the rotary drive apparatus while changing the direction of the incoming light. The housing includes a first tubular portion being tubular, and arranged to extend along a central axis extending in a vertical direction; and a second tubular portion being tubular, and arranged to extend along the central axis below the first tubular portion. The first tubular portion is arranged to house therein at least a portion of the light source. The second tubular portion is arranged to house therein at least a portion of the rotary drive apparatus. A cavity radially inside of the housing includes a light path along which the incoming light travels.

Abstract: A bearing portion includes an upper dynamic pressure portion, a lower dynamic pressure portion, and an intra-bearing space defined between a lower surface of a fluid in the upper dynamic pressure portion and an upper surface of a fluid in the lower dynamic pressure portion, and not including the fluid. An airway defined in a shaft includes an inner opening arranged to be in communication with the intra-bearing space, and an outer opening arranged to be in communication with an extra-bearing space. Each of the inner and outer openings is defined in a side surface of the shaft. The extra-bearing space and the intra-bearing space are arranged to be in communication with each other through the airway. The airway is arranged to extend substantially in a straight line or lines, is angled with respect to a central axis, and has no other openings than the inner and outer openings. This contributes to preventing a gas inside of a housing from leaking out of the housing through the airway.

Abstract: This motor includes a stationary portion including a stator; and a rotating portion supported to be rotatable about a central axis extending in a vertical direction with respect to the stationary portion, and including a shaft arranged to extend along the central axis. The stationary portion includes a bearing arranged to rotatably support the shaft, and a base portion arranged to hold the stator. The rotating portion includes a rotor hub portion arranged to extend in an annular shape around the shaft; a magnet directly or indirectly fixed to the rotor hub portion, and arranged opposite to the stator; a flywheel arranged axially above the rotor hub portion; and a seal portion arranged to have a thickness smaller than the thickness of the magnet. At least a portion of an outer circumferential surface of the rotor hub portion is a metal surface.

Abstract: A bearing portion includes an upper dynamic pressure portion, a lower dynamic pressure portion, and an intra-bearing space defined between a lower surface of a fluid in the upper dynamic pressure portion and an upper surface of a fluid in the lower dynamic pressure portion, and not including the fluid. An airway defined in a shaft includes an inner opening arranged to be in communication with the intra-bearing space, and an outer opening arranged to be in communication with an extra-bearing space. Each of the inner and outer openings is defined in a side surface of the shaft. The extra-bearing space and the intra-bearing space are arranged to be in communication with each other through the airway. The airway is arranged to extend substantially in a straight line or lines, is angled with respect to a central axis, and has no other openings than the inner and outer openings. This contributes to preventing a gas inside of a housing from leaking out of the housing through the airway.

Abstract: A motor includes a rotating portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion, an upper plate portion, and a lower plate portion. The upper plate portion is disposed in one side of the shaft component and extends radially outward from the one side of the shaft component. The lower plate portion is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component. The rotating portion includes a sleeve portion. The inner shaft portion and the outer shaft portion are fixed by an adhesive. An adhesive retaining portion is provided between an outer peripheral portion of the inner shaft portion and an inner peripheral portion of the outer shaft portion.

Abstract: A motor includes a rotating portion including a sleeve portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion. A radial dynamic pressure generating groove array is provided on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper radial dynamic pressure generating groove array and a lower radial dynamic pressure generating groove array. A range of a fixing region in an axial direction between the inner shaft portion and the outer shaft portion in an interference fit state is included in a range between the upper radial dynamic pressure generating groove array and the lower radial dynamic pressure generating groove array.

Abstract: A motor includes a rotating portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion, an upper plate portion, and a lower plate portion. The upper plate portion is disposed in one side of the shaft component and extends radially outward from the one side of the shaft component. The lower plate portion is disposed on the other side of the shaft component and extends radially outward from the other side of the shaft component. The rotating portion includes a sleeve portion. The inner shaft portion and the outer shaft portion are fixed by an adhesive. An adhesive retaining portion is provided between an outer peripheral portion of the inner shaft portion and an inner peripheral portion of the outer shaft portion.

Abstract: A motor includes a rotating portion including a sleeve portion and a stationary portion. The stationary portion includes a shaft component which includes an inner shaft portion and an outer shaft portion. A radial dynamic pressure generating groove array is provided on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper radial dynamic pressure generating groove array and a lower radial dynamic pressure generating groove array. A range of a fixing region in an axial direction between the inner shaft portion and the outer shaft portion in an interference fit state is included in a range between the upper radial dynamic pressure generating groove array and the lower radial dynamic pressure generating groove array.

Abstract: A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is provided. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.

Abstract: A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is provided. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.

Abstract: A motor includes a shaft component including an inner shaft portion and an outer shaft portion. A radial gap is defined between a sleeve portion and the outer shaft portion. A radial dynamic pressure generating groove array is arranged on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper and lower radial dynamic pressure generating groove array. The inner shaft portion is fixed to the outer shaft portion in an interference fit. An axial range of a fixing region of the inner shaft portion and the outer shaft portion which is in the interference fit is included in a range between the upper and lower radial dynamic pressure generating groove array.

Abstract: A motor includes a shaft component including an inner shaft portion and an outer shaft portion. A radial gap is defined between a sleeve portion and the outer shaft portion. A radial dynamic pressure generating groove array is arranged on at least one surface of an inner circumferential surface of the sleeve portion and an outer circumferential surface of the outer shaft portion, which define the radial gap. The radial dynamic pressure generating groove array includes an upper and lower radial dynamic pressure generating groove array. The inner shaft portion is fixed to the outer shaft portion in an interference fit. An axial range of a fixing region of the inner shaft portion and the outer shaft portion which is in the interference fit is included in a range between the upper and lower radial dynamic pressure generating groove array.

Abstract: A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The upper plate portion defines a single monolithic member with one of the inner shaft portion and the outer shaft portion. The lower plate portion defines a single monolithic member with the other of the inner shaft portion and the outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is arranged. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.

Abstract: A motor includes a shaft component, an upper plate portion, a lower plate portion, and a sleeve portion. The shaft component includes an inner shaft portion and an outer shaft portion. The upper plate portion defines a single monolithic member with one of the inner shaft portion and the outer shaft portion. The lower plate portion defines a single monolithic member with the other of the inner shaft portion and the outer shaft portion. The sleeve portion is disposed between the upper plate portion and the lower plate portion. A radial gap is defined between the sleeve portion and the outer shaft portion. A fixing range in which the outer shaft portion and the inner shaft portion radially overlap is arranged. At least a portion in an axial direction of the fixing range radially overlaps with an existing range in the axial direction of the radial gap.