Abstract: In an electromagnetic driver according to the invention, electromagnetic units are arranged in the axial direction of a shaft, and a power supply change-over device is so formed that, when an attractive magnetic field arises between the coil unit and the magnetic unit of the one of the electromagnetic units, a repulsive magnetic field is generated between the coil unit and the magnet unit of the other of the electromagnetic units. As the polarity is alternately changed over by the power supply change-over device when a direct current is supplied to the exciting coils of the electromagnetic units, the coil unit or the magnetic unit reciprocates, and further the shaft reciprocates in the axial direction.

Abstract: In an electromagnetic driver according to the invention, electromagnetic units are arranged in the axial direction of a shaft, and a power supply change-over device is so formed that, when an attractive magnetic field arises between the coil unit and the magnetic unit of the one of the electromagnetic units, a repulsive magnetic field is generated between the coil unit and the magnet unit of the other of the electromagnetic units. As the polarity is alternately changed over by the power supply change-over device when a direct current is supplied to the exciting coils of the electromagnetic units, the coil unit or the magnetic unit reciprocates, and further the shaft reciprocates in the axial direction.

Abstract: A diffuser is a structure having a porous diffusing member into which aromatic matter or the like is impregnated and an incandescent lamp accelerating diffusion of the aromatic matter or the like impregnated into the diffusing member. When using the diffuser liquid aromatic matter is dropped into the diffusing member, after which the incandescent lamp is actuated. The actuated incandescent lamp accelerates diffusion of the aromatic matter impregnated into the diffusing member, so that the aromatic matter may be diffused over the whole room in a short time.

Abstract: A dynamic speaker device having a small-sized vibrating plate for reproducing a high frequency sound is further provided with an additional coil in the vicinity of the magnet assembly of the speaker. The additional coil is mounted on a comparatively heavy vibrating element which is supported by a spring plate. The additional coil and the vibrating element vibrates to reproduce lower frequency sound and vibration in response to audio signal supplied to the additional coil.

Abstract: An athletic training unit having a radio receiver and speakers for informing a music and instructor's messages to an exerciser by a wireless manner. A desired rhythm signal is selectively supplied to the speakers from a rhythm generator so as to provide the musical rhythm to the exerciser. The unit further has a sensor for detecting the pulse of the exerciser so that the exerciser is noticed a fact that his pulse exceeds his safety upper limit for exercising. As the pulse sensor, a pair of an infrared LED and a photo transistor is used.

Abstract: An audio-frequency electromechanical vibrator having a flat hollow case with a thin cover plate, a flat ring-shaped permanent magnet axially magnetized and a flat annular drive coil unit. The magnet and the coil unit are disposed in the case coaxial with one another and with an axial space therebetween. The magnet is fixedly mounted on the bottom of the case and the coil unit is elastically supported to the case by a spring plate so that the vibrator can generate strong vibrations without noise generation corresponding to a comparatively higher frequency component in an audio signal applied to the coil unit.

Abstract: An electromechanical vibrator driving device comprising a rhythm signal generator to produce rhythmic pulses in a pattern corresponding to a beat pattern of a selected music rhythm, the rhythmic pulses being amplified and then applied to the vibrator so that the vibrator generates a rhythmical vibration of the selected music rhythm. The rhythm signal generator comprises a rhythm pattern generator storing different rhythm patterns and providing pulses corresponding to strong beats and pulses corresponding to weak beats in a selected rhythm pattern, separately. The strong beat pulses and the weak beat pulses are processed by attenuators to have different amplitudes and are mixed to produce the rhythm signal.

Abstract: An audio-frequency electromechanical vibrator having a flat hollow case with a thin cover plate, a flat ring-shaped permanent magnet axially magnetized and a flat annular drive coil unit. The magnet and the coil unit are disposed in the case coaxial with one another and with an axial space therebetween. The magnet is fixedly mounted on the bottom of the case and the coil unit is elastically supported to the case by a spring plate so that the vibrator can generate strong vibrations without noise generation corresponding to a comparatively higher frequency component in an audio signal applied to the coil unit.

Abstract: An electromechanical vibrator driving device comprising a rhythm signal generator to produce rhythmic pulses in a pattern corresponding to a beat pattern of a selected music rhythm, the rhythmic pulses being amplified and then applied to the vibrator so that the vibrator generates a rhythmical vibration of the selected music rhythm. The rhythm signal generator comprises a rhythm pattern generator storing different rhythm patterns and providing pulses corresponding to strong beats and pulses corresponding to weak beats in a selected rhythm pattern, separately. The strong beat pulses and the weak beat pulses are processed by attenuators to have different amplitudes and are mixed to produce the rhythm signal.