JPS6355349B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] The present invention relates to a pine surge machine.

[Background Art] Fig. 1 shows a conventional example. Reference numeral 2 denotes a vibrating device, and this vibrating device 2 is composed of a vibrating device 9 and a movable part 10, and a massaging ball 3 is connected to the lower part of the movable part 10. The massage balls 3 are brought into contact with the treatment surface of the human body 8 with a certain pressure, an excitation current is passed through the vibrator 9, and the movable part 10 connected to the massage balls 3 is vibrated to perform pine surge by the massage balls 3. In such a case, there is a problem in that the vibration propagation is limited to only by the vibrator 9, and the effect of the pine surge cannot be enhanced.

[Object of the Invention] The present invention has been provided in view of the above-mentioned points, and provides a vibrating system such as a massaging ball with resonance characteristics.
A pine surge that aims to further enhance the kneading effect by applying large vibrations by controlling the excitation frequency to match the resonance frequency of the composite impedance of the mechanical impedance of the excitation system and the mechanical impedance of the human body. It provides an opportunity for

[Disclosure of the Invention] Examples of the present invention will be described below with reference to the drawings.
FIG. 2 shows a principle diagram of the present invention, and the second
Figure a shows a series resonance system of the mass m of the massaging balls 3 and the spring 4k, and the mechanical impedance Z seen from one end of the spring 4 is expressed by the following equation.

Z=F/V=-jmk/mω-(K/ω)...where ω=angular frequency, F=force, and V=velocity.

The resonant frequency ω ₀ is expressed by the following equation.

FIG. 2b shows the relationship between frequency and mechanical impedance Z. At the time of resonance, the denominator of the equation for Z is 0, so the mechanical impedance Z becomes infinite, the force F applied to the resonant system becomes maximum, and the velocity of the mass m
V′ becomes maximum.

Here, in the equation, the force F and velocity V are the spring 4
On the driving side, when resonance occurs, V=0 and F remains unchanged due to the driving force itself. The force applied to the resonant system means the force F' applied to the mass m. And the velocity V' of mass m means the following formula.

V'=s/ω 1/1-ω ² (m/s)F'... Here, s is the stiffness of the system.

At resonance, V' becomes infinite, so F' also becomes infinite. In reality, since it comes into contact with the human body, ω ₀ is slightly shifted to ω ₀ ′, and there is attenuation, so
V′ and F′ will not be infinite, but will take a certain maximum value.

FIG. 3 shows a configuration diagram of the present invention, and the vibration device 2 consisting of the vibration exciter 9 and the movable part 10 is constructed in the same manner as the conventional one. Reference numeral 11 denotes a disc-shaped support plate, the upper surface of which is connected and fixed to the movable part 10, and a plurality of springs 4 are fixed to the lower surface of the support plate 11. A cylindrical massaging ball 3 is connected and fixed to the lower end of the spring 4, which has a stiffness greater than that of a human body. The spring 4 and the massaging balls 3 constitute a vibrating device 5. This vibration device 5
The vibration system contacts the treatment surface of the human body 8. A control device 7 drives an oscillator 9 using an oscillator 1 that generates a sinusoidal voltage according to a frequency control signal instructed by the control device 7 and a current amplifier 12. and,
The vibration state of the massaging balls 3 is detected by an acceleration sensor 6 installed on the massaging balls 3, impedance conversion and amplification are performed by a preamplifier 13, and the acceleration A is input to a control device 7.

Incidentally, the above-mentioned acceleration sensor 6 has a structure as shown in FIG. 5, and the acceleration sensor 6, which is called an acceleration pickup, has a weight 21 and a piezoelectric element 22 disposed within a case 20 thereof. Acceleration A of the case 20 in the direction of the arrow in FIG.
When the piezoelectric element 22 is held between the case 20 and the weight 21, a force MA is applied due to the inertia M of the weight 21. Since the piezoelectric element 22 converts force into voltage, it generates an acceleration voltage of V=KMA, where K is the conversion efficiency. After all, since KM is constant, V is a voltage representing acceleration. Therefore, this acceleration sensor 6 converts acceleration into acceleration voltage.

Next, the relationship between the resonant frequency of the mechanical impedance of the human body 8 and the resonant frequency of the excitation system composed of the massaging balls 3, the spring 4, the excitation device 2, etc. will be explained. The resonance frequency of the mechanical impedance of the human body 8 has a range of approximately 30 to 150 Hz, and cannot be specified due to individual differences. Therefore, in the present invention, the resonance frequency of the excitation system is set to a predetermined value, for example, 60 Hz, so that the best resonance can be obtained in accordance with the human body 8. For example, if the resonant frequency is 8
Assuming that ωm = 100Hz and the excitation system ωk = 60Hz,
The frequency at which the combined impedance of both causes maximum resonance (because it is a combination, it is possible that small resonance occurs) is, for example, ω ₀ =70Hz. This uses a mass component, stiffness component, and larger excitation system than the human body 8, so the resonance frequency of the excitation system is close to 60 Hz, which is the resonant frequency ωk. In reality, it cannot be determined unless the model and constants of the human body 8 and the excitation system are determined, but it can be estimated that they are close to ωm and ωk.
Resonant frequency of the composite impedance including both the mechanical impedance of the human body 8 and the excitation system ω ₀ = 70Hz
Although the resonant frequency ωm of the mechanical impedance of the human body 8 and the resonant frequency ωk of the excitation system do not match at all, it is close to the resonant frequency of the mechanical impedance of the human body 8, and since it is really a composite system resonance, the pine surge effect can be said to be high. As described above, the present invention searches by moving the excitation frequency ω in order to obtain the composite resonance frequency ω ₀ in the composite impedance of the mechanical impedance of the excitation system and the mechanical impedance of the human body 8.

Next, the points that the massaging balls 3 have a mass larger than that of the human body 8 and the points that the spring 4 has a stiffness larger than that of the human body 8 will be explained. "The mass and stiffness of the human body" means "the mass and stiffness of the human tissue around which the massage balls come into contact with the human body." As shown in FIG. 3, the massaging balls 3 vibrate by sandwiching the human body tissues such as the subcutaneous tissue 23 such as fat and the muscles 24 located between the skeleton 25 and the massaging balls 3. It becomes the human body tissue around 3. In addition, the parts of the human body other than the skeleton 25 and the area around the massage ball 3 are static surfaces (surfaces that remain stationary even when affected by vibrations).
it is conceivable that. In other words, the vibration range of the massage balls 3 is a narrow range from the massage balls 3 to the skeleton 25,
It's not enough to shake the entire human body.

Therefore, the mass of the human body is not a large thing such as body weight, but about 0.5 to 1.5 grams, and the stiffness of the human body is not a large thing such as the spring coefficient of the skeleton 25, but is 5 to 50 grams per gram. It is as small as a cm.

Therefore, "massage ball 3 has a mass larger than human body 8"
To make the massage balls 3 have a mass of about 100g, to make the spring 4 stiffness greater than the human body 8 means to make the spring 4 1000g/
This corresponds to "stiffness of about cm". In this way, the massaging balls 3 and springs 4, which have a mass and stiffness larger than the human body 8, are used to excite,
By resonating, large vibrations can be obtained and the kneading effect is high.

Figure 6 shows the so-called complaint correspondence diagram, and the massage ball 3
The control device 7 controls the excitation frequency in a direction to match the resonant frequency of the composite impedance of the mechanical impedance of the excitation system and the mechanical impedance of the human body 8 by giving the excitation system such as
Maximum value detection means 31, storage means 32, comparison means 3
3. It is composed of a frequency variable means 34, a control means 35, and the like. That is, the maximum value of the acceleration voltage signal output from the acceleration sensor 6 is detected by the maximum value detection means 31, and the maximum value of the signal corresponding to the acceleration detected by the maximum value detection means 31 is added by the storage means 32. The maximum value of the stored signal is updated and stored each time the vibration frequency changes, and the comparison means 33 compares the maximum value of the stored signal with the maximum value of the newly input signal. The output of the comparison means 33 is input to the frequency variable means 34 or the control means 35, and the oscillator 1 is controlled by the output, and the resonant impedance of the excitation system and the resonant impedance of the human body 8 are adjusted as described below. Control is performed so that the combined impedance is maximized. In other words, the frequency variable means 34 changes the oscillation frequency of the oscillator 1 so that the acceleration of the vibration device 5 becomes maximum, and when the acceleration reaches the maximum, the oscillation frequency of the oscillator 1 is changed by the output of the comparison means 33. is fixed by the control means 35, and the oscillator 2 continues to oscillate at that frequency.

FIG. 4 is a flowchart showing the operation of the present invention. In FIG. 4, the maximum value Amax of acceleration A is detected and the excitation frequency at that time is held. First, the initial value of the maximum acceleration value Amax is set to zero, and the excitation frequency ω is set to _ω1 . The vibrator 9 is vibrated at ω, and the acceleration A is read from the output from the acceleration sensor 6 and compared with the maximum value Amax. When Amax<A, A=Amax is set, the excitation frequency ω is updated to ω+Δω, and the loop is repeated. When Amax>A, vibration is performed at ω=ω−Δω, and frequency control is completed while maintaining the resonance frequency. In other words, the resonant frequency at this time is the resonant frequency ω ₀ due to the composite impedance of the mechanical impedance of the human body 8 and the impedance of the excitation system such as the massage ball 3, the spring 4, and the excitation device 2, and this resonant frequency ω ₀ is human body 8
As described above, the force applied to the resonant system maximizes the force and speed of the mass of the massaging balls 3, thereby further enhancing the massaging effect.

[Effects of the Invention] As described above, the present invention includes an excitation device that emits vibrations at a predetermined excitation frequency from an oscillator, a massaging ball that has a mass greater than the mass of the human body and contacts the treatment surface of the human body, and the human body. a vibration device coupled to a spring having a stiffness greater than maximum value detection means for detecting the maximum value of a signal corresponding to the acceleration input from the vibrating device via the acceleration sensor; and a maximum value detection means for updating the maximum value of the signal corresponding to the acceleration output from the maximum value detection means. a storage means for storing, a comparison means for comparing the maximum value of the previous signal stored in the storage means with the maximum value of the current signal, and a maximum value of the signal to be compared by the comparison means is the maximum value of the previous signal; If the maximum value of the signal compared by the comparing means is smaller than the maximum value of the previous signal, a frequency variable means changes the frequency of excitation to the vibrating device when the value is larger than the previous value. Since it is equipped with a control means that continues to vibrate the vibrating device,
By changing the excitation frequency to the vibrating device and controlling the acceleration of the vibrating device to the maximum, the excitation system such as massage balls can have resonance characteristics, and the excitation frequency can be adjusted to The mechanical impedance of the excitation system and the mechanical impedance of the human body can be controlled to match the resonant frequency of the composite impedance of the human body, and the composite impedance of the mechanical impedance of the excitation system and the mechanical impedance of the human body can be maximized. This has the effect of further enhancing the effect.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the conventional example, Fig. 2 a and b are principle diagrams of the embodiment of the present invention, Fig. 3 is a block diagram of the same as above, Fig. 4 is a flowchart of the same as above, and Fig. 5 is a diagram of the same as above. FIG. 6 is a cross-sectional view of the acceleration sensor, and is a diagram corresponding to the so-called complaint shown above. 1 is an oscillator, 2 is a vibration device, 3 is a kneading ball, 4 is a spring, 5 is a vibration device, 6 is an acceleration sensor, 7 is a control device, 8 is a human body, 31 is a maximum value detection means, 3
2 is a storage means, 33 is a comparison means, 34 is a frequency variable means, and 35 is a control means.

Claims (1)

[Claims] 1. An excitation device that emits vibrations at a predetermined excitation frequency from an oscillator, a massaging ball that has a mass greater than the mass of the human body and is in contact with the treatment surface of the human body, and a spring that has stiffness greater than the human body. A vibration device excited by the vibration device, an acceleration sensor provided on the vibration device to detect the acceleration of the vibration device, and input from the vibration device vibrated at a predetermined frequency via the acceleration sensor. maximum value detection means for detecting the maximum value of the signal corresponding to acceleration; storage means for updating and storing the maximum value of the signal corresponding to acceleration outputted from the maximum value detection means; a comparison means for comparing the maximum value of the previous signal and the maximum value of the current signal; and when the maximum value of the signal compared by the comparison means is larger than the maximum value of the previous signal, the vibration device is vibrated. a frequency variable means for changing the frequency;
A pine surgery machine comprising: control means for continuing to vibrate a vibrating device at the frequency previously vibrated when the maximum value of a signal compared by the comparison means becomes smaller than the maximum value of the previous signal.