Abstract: A vibrating module for generating a mainly non-audible alert signal comprises a vibrating mass supported by at least one spring and having a weight and a magnet. A drive coil is supported by a coil frame for placing the vibrating mass in a continuous reciprocating motion close to a resonant frequency determined by the vibrating mass and the spring. An electrical signal supplying device supplies an electrical signal to the drive coil to vibrate the vibrating mass in a linear reciprocating motion. A vibration transmitting device transmits the vibration of the vibrating mass via the spring to an outer portion of the vibrating module to generate a mainly non-audible alert signal.

Abstract: A method of manufacturing a radially oriented magnet comprises disposing magnetic particles in a mold comprised of an insulating material, applying a pulsed magnetic field to the magnetic particles using a pair of pulse coils to impart a radial direction of magnetization to the magnetic particles, and press-forming the magnetic particles. The effective amount of magnetic flux which is applied to the magnetic particles can be effectively increased by introducing a pair of conducting rings between the pair of pulse coils for generating an eddy current effect between the pair of pulse coils to control the magnetic flux of the pulsed magnetic field. Such a method enables the manufacture of a downsized radially oriented magnet having a high degree of orientation.