- Síndrome cervicovestibular (con vértigo),
- Calambres musculares
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An aspect of the present invention is the linear oscillator further in which the electromagnetic driving part includes a coil surrounding an outer periphery of the moving part, second yokes disposed at both ends of the coil, a pair of permanent magnets which are provided at an end face of each of the second yokes and also which are magnetized symmetrically with respect to the center of the coil, and first yokes provided on the sides of the permanent magnets opposite to the second yokes. Equation (4) the moving part and the amplitude oscillation spindle 9 move in a same phase and in an oscillation mode of the resonance frequency f2 of the secondary side (higher order side) of Equation (5) the moving part and the amplitude control spindle 9 move in phases opposite to each other; so that when the moving part is reciprocated axially by flowing through the coil 5 a current having a frequency in the vicinity of this secondary side resonance frequency f2, the amplitude control spindle 9 moving in the opposite phase cancels inertia force of the moving part, which in turn cancels an inertia force of the amplitude control spindle 9. In this state, further, the two mass points of the moving part and the amplitude control spindle 9 would move so as to balance their respective inertia forces to thereby give a great effects of canceling the inertia forces by means of the counteraction, thus minimizing the force transmitted from these two mass points (the moving part and the amplitude control spindle 9) to the fixed part side hence the amplitude of the linear oscillator.
Dolores Musculares Causas
If the spring coefficients k1 and k3 of the springs 60 and 62 respectively are thus set smaller, the amplitude control spindle 9 receives a less force from the fixed part, resulting in a larger stroke of the moving part. An aspect of the present invention is the linear oscillator further in which the spring member includes a first spring disposed between a fixed part including the case and the electromagnetic driving part and the moving part, a second spring disposed between the moving part and the amplitude control spindle, and a third spring disposed between the amplitude control spindle and the fixed part.
Dolor Espalda Alta Causas
FIG. 17 shows an additional embodiment of the present invention, in which the shield case 10 has on its inner surface a guide (rocking preventing means) 15 for preventing the amplitude control spindle 9 from rocking. An aspect of the present invention is the linear oscillator further in which the amplitude control spindle is provided with a rocking preventing means for preventing rocking.
FIG. 14 shows an additional embodiment of the present invention, in which when the plunger 1 (moving part) having a large diameter portion at both ends, in its reciprocating direction, and a small diameter portion at its center is present at a neutral position, the boundary between the large diameter and small diameter portions roughly agrees with the end face of the yoke 30 and 31 on the side of the coil 5 and both axial end faces of the plunger 1 roughly agree with the end faces of the permanent magnets 40 and 41 on the sides of the yokes 20 and 21 respectively.