Abstract: An embodiment is a structure including a first package including a first die, and a molding compound at least laterally encapsulating the first die, a second package bonded to the first package with a first set of conductive connectors, the second package comprising a second die, and an underfill between the first package and the second package and surrounding the first set of conductive connectors, the underfill having a first portion extending up along a sidewall of the second package, the first portion having a first sidewall, the first sidewall having a curved portion and a planar portion.

Abstract: A magnetic coupling device includes a magnetic flywheel unit including a flywheel and multiple first magnets equiangularly spaced around the periphery of the flywheel to form a first annular magnetic series with the same pole facing toward the radial outer side of the flywheel, and a magnetic coupling unit including a plate body rotatably mounted to the periphery of the flywheel, a rotating shaft mounted to the center of axis of the plate body, multiple second magnets and third magnets alternatively mounted on the plate body around the rotating shaft to create a second annular magnetic series that is magnetically coupled to the first annular magnetic series. Further, a magnetoresistive ring frame is mounted to the periphery of the flywheel for movement along the axial direction of the flywheel to create a magnetic coupling control device.

Abstract: A magnetic coupling device includes a magnetic flywheel unit including a flywheel and multiple first magnets equiangularly spaced around the periphery of the flywheel to form a first annular magnetic series with the same pole facing toward the radial outer side of the flywheel, and a magnetic coupling unit including a plate body rotatably mounted to the periphery of the flywheel, a rotating shaft mounted to the center of axis of the plate body, multiple second magnets and third magnets alternatively mounted on the plate body around the rotating shaft to create a second annular magnetic series that is magnetically coupled to the first annular magnetic series. Further, a magnetoresistive ring frame is mounted to the periphery of the flywheel for movement along the axial direction of the flywheel to create a magnetic coupling control device.

Abstract: A magnetic coupling device includes a magnetic flywheel unit including a flywheel and multiple first magnets equiangularly spaced around the periphery of the flywheel to form a first annular magnetic series with the same pole facing toward the radial outer side of the flywheel, and a magnetic coupling unit including a plate body rotatably mounted to the periphery of the flywheel, a rotating shaft mounted to the center of axis of the plate body, multiple second magnets and third magnets alternatively mounted on the plate body around the rotating shaft to create a second annular magnetic series that is magnetically coupled to the first annular magnetic series. Further, a magnetoresistive ring frame is mounted to the periphery of the flywheel for movement along the axial direction of the flywheel to create a magnetic coupling control device.

Abstract: A magnetic control method for controlling the magnetic damping force to the flywheel of the exercise equipment includes a magnetic control system having a control member and a magnetic array set. At least two track rails are installed outside of flywheel and parallel to the axle of flywheel. The magnetic array set is installed on the at least two track rails and has the consistent gap to flywheel. The control member drives and controls the magnetic array set to move co-axially to the axle and parallelly to the cylindrical surface of flywheel, along the at least two track rails to adjust the magnetic damping force to the flywheel. The overlapped area between the magnetic array and the cylindrical surface of flywheel is varied by control member to move the magnetic array set. So as the relationship between the magnetic damping force and the moving distance of the magnetic array set is linear. Thus the control member can be linear setting to build.

Abstract: A sphere zone coupling of magnetic devices has a first rotor containing permanent magnet array and a second rotor. The first rotor and the second rotor have the sphere zone surfaces forming from magnetic array or similar of almost the same sphere radius facing with constant air gap at overlapped area. The axle of the first rotor and the axle of the second rotor are concentric and non-coaxial. The second rotor has permanent magnet array, ferromagnetic or conductive material to couple with the first rotor at the sphere zone surfaces. The rotation of the first rotor causes magnetic force to drive the second rotor. The transmission ratio will depend on the average zone radius ratio of two coupling rotors and the pair number ratio of magnets in magnetic arrays.