Abstract: A method includes forming a first polymer layer to cover a metal pad of a wafer, and patterning the first polymer layer to form a first opening. A first sidewall of the first polymer layer exposed to the first opening has a first tilt angle where the first sidewall is in contact with the metal pad. The method further includes forming a metal pillar in the first opening, sawing the wafer to generate a device die, encapsulating the device die in an encapsulating material, performing a planarization to reveal the metal pillar, forming a second polymer layer over the encapsulating material and the device die, and patterning the second polymer layer to form a second opening. The metal pillar is exposed through the second opening. A second sidewall of the second polymer layer exposed to the second opening has a second tilt angle greater than the first tilt angle.

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.