JPS63183074A - High frequency magnetic remedy device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a high-frequency magnetic therapy device that pseudo-randomly changes the frequency of a high-frequency magnetic field.

(Background Art) Conventionally, high-frequency magnetic therapy devices have been proposed that are effective in treating stiff shoulders, promoting blood circulation, etc. by irradiating the human body with a high-frequency magnetic field generated by passing a high-frequency current through a coil. As shown in the block diagram of Fig. 6, the oscillation circuit of the high-frequency magnetic therapy device mixes the output signals of the low-frequency oscillation section (1) and the high-frequency oscillation section (2) in the signal mixing section (4). A method of obtaining a desired output signal is adopted. FIG. 7 shows a specific example of the circuit. In FIG. 7, the low frequency oscillator (1) includes resistors (R+), (R2) and a capacitor (C
) and a Schmidt type inverter (1
1), an inverter (12), and a MOSFET (Q+>), which oscillates a low frequency signal as shown in FIG.
), . In the signal mixing section (4), these signals are mixed by a NAND gate (41), and the mixed signal is sent to an inverter (42).
The coil current is inputted to the current carrying part (3) via the buffer (31) and then transferred to the N-channel type MOS F E
The signal input to the coil current carrying part (3), which turns on and off T (Q3) and causes a high frequency current to flow through the magnetic field generating coil (L), is as shown in FIG. 8(c). This is a high-frequency intermittent type high-frequency magnetic therapy device, that is, when the high-frequency current shown in Figure 8(c) flows through the coil (L), a magnetic field in which a high frequency is superimposed on a low frequency is induced, and this magnetic field is applied to the human body. It functions as a treatment for patients.

In this conventional example, as shown in FIG. 8(c), an attempt is made to prevent the human body from becoming accustomed to the magnetic field by providing a rest period for the magnetic field. Since the frequency remains constant as long as the power supply voltage does not change, it was fortunate that simply providing such a period of rest for the magnetic field could not sufficiently prevent the human body from becoming accustomed to it.

(Object of the invention) The present invention has been made in view of the above points, and
The purpose is to provide a high-frequency magnetic therapy device that uses a high-frequency magnetic field whose oscillation frequency changes pseudo-randomly, thereby preventing the human body from getting used to it.

(Disclosure of the Invention) FIG. 1 is a block diagram for explaining the present invention in detail. As shown in the figure, the high frequency magnetic therapy device of the present invention includes a high frequency oscillation section (2) that oscillates a high frequency signal;
A pseudo-random pulse generator (5) generates pseudo-random pulses from the output signal of the high-frequency oscillator (2), and current is applied to the coil for magnetic field generation according to the output signal of the pseudo-random pulse generator (5). The current-carrying part of the coil to be energized (
3) By generating a magnetic field in response to a pseudo-random pulse, the frequency of the high-frequency magnetic field can be changed pseudo-randomly, reducing the human body's habituation. be.

Here, the pseudo-random pulse generator (5) consists of a counter etc. in which flip-flops are connected in cascade, and is driven by the output signal of the high-frequency oscillator (2), and strictly speaking, it is a pulse train that periodically shows the same change. However, when a portion of the generated pulse train is extracted and viewed, it generates a pulse train that looks like a random pulse, and the details will be explained in the following embodiments. In the circuit shown in FIG. 1, in order to provide a rest period for the magnetic field, a pseudo-random pulse signal output from the pseudo-random pulse generator (5) and a low-frequency signal output from the low-frequency oscillator (1) are combined. However, in the present invention, since the frequency of the high-frequency magnetic field has pseudo-randomness, it is not necessarily necessary to provide a pause period for the magnetic field.

FIG. 2 is a circuit diagram of one embodiment of the present invention. The configurations of the low frequency oscillation section (1), the high frequency oscillation section (2), and the coil current conducting section (3) are the same as those of the conventional example shown in FIG.

The pseudo-random pulse generator (5) consists of five stages of D flip-flops FF, -FF5 and an exclusive NOR gate G1. A high frequency signal output from the high frequency oscillator (2) is input to the clock input T, ~T, of each D flip-flop FF, ~FF. Furthermore, a low frequency signal output from the low frequency oscillator (1) is input to each of the D flip-flops FF, -FF, and the glue set R. The output Q of the first-stage D flip-flop FF is connected to the data input D2 of the next-stage D flip-flop FF.

Similarly, outputs Q2 to Q4 of the D flip-flops 1FF2 to FF4 are connected to data inputs D3 to D5 of the D flip-flops FF3 to FF in the next stage, respectively. The output Q of the third stage D flip-flop FF3 and the output Q of the fifth stage D flip-flop FF5 are input to the first stage D flip-flop FF via an exclusive NOR gate G. feedback has been provided. Exclusive NOR gate G.

The output of is the output Q of the third stage D flip-flop FF.
, and the output Q of the fifth-stage D flip-flop FF5 match, it becomes a "High" level, and this signal is fed back to the data input of the first-stage D flip-flop FF. A pseudo-random pulse is obtained.

In this pseudo-random pulse generation section (5), five stages of D flip-flops FF, ~FF are connected in cascade, and by increasing or decreasing the number of stages, one period of the random pulse changes. Logic simulation results for the stage case are shown in FIGS. 3 and 4.

One period TR during which a pseudo-random waveform is generated is TF<
= (2T'-1)・T. Here, n is the number of stages of D flip-flops, and in the case of this embodiment, n=
It is 5. Therefore, increasing n increases the period that can be considered random.

Fig. 5(a) shows the output signal of the exclusive NOR gate G+, Fig. 5(b) shows the output signal of the low frequency oscillator (1), and Fig. 5(c)
is the waveform of the high frequency magnetic field. In FIG. 5(b), the coil current is not energized during the period when the signal is 'Low' level.The reason why the signal in FIG. 5(b) is connected to the reset power R of the D flip-flop is Outputs Q1 to Q of flip-flops FF+ to FFs are all 'H'
This is to prevent this because the output does not become a random pulse only when starting from the 'High' level, and the output is always at the 'High' level.

The output of the low frequency oscillator (1) shown in FIG. 5(b) is “Hi”
When it comes to g11′ rubel, exclusive N OR gate G +
A pseudo random pulse is generated at the output. In response to this output, a coil for generating a magnetic field is energized, and a high-frequency magnetic field is obtained in which pseudo-random pulses Rp are repeatedly generated with a rest period T0 in between, as shown in FIG. 3(c).

Next, the circuit configurations of the low frequency oscillation section (1) and the high frequency oscillation section (2) will be explained. First, the low frequency oscillator (1) has a time constant circuit consisting of resistors (R+), (R2) and a capacitor (C). The capacitor (C) is the resistor (R1
) is connected to the power supply voltage through a resistor (R2)
and is connected to the ground level via an N-channel MOSFET (Ql). This MOSFET (Q,)
acts as a charging/discharging switch for the capacitor (C) 1
, when it is on, the charging charge of the capacitor (C) is transferred to the resistor (R2
), and when off, the capacitor (C) is charged by the power supply voltage via the resistor (R1). The voltage level of the capacitor (C) is input to a Schmitt type inverter (11) having hysteresis characteristics. The output of this Schmidt type inverter (11) is the inverter (
12) and M OS F E T (Q
+) is input to the gate.

When the power is turned on, the voltage level of the capacitor (C) is low, so the output of the Schmitt type inverter (11) is H level, the output of the inverter (12) is L level, and the MOSFET (Ql) is in the OFF state. . Therefore, the capacitor (C) is charged by the power supply voltage via the resistor (Ro). When the voltage level of the capacitor (C) becomes equal to or higher than the first threshold level, the output of the Schmidt inverter (11) becomes L level, and the output of the inverter (12) becomes H level. This allows M.O.
SFET (Ql) turns on, the charge in the capacitor (C) is discharged through the resistor (R2), and the capacitor (
The voltage level of C) decreases. When the voltage level of the capacitor (C) becomes equal to or lower than the second threshold level, which is lower than the first threshold level, the output of the Schmitt type inverter (11) becomes H level, and the output of the inverter (12
) output becomes L level. Therefore, MOSFET
(Q,) is in the off state, and the capacitor (C) is the resistor (
It is connected to the power supply voltage via R1), and its power level rises to Tt. Thereafter, similar operations are repeated to oscillate a low frequency signal (see FIG. 5(b)) determined by the time constants of the resistors <R1>, <R2) and the capacitor (C). The output signal of the low frequency oscillator (1) is obtained as the output of the Schmitt type inverter (11), and this signal is applied to the D flip-flop FF in the pseudorandom pulse generator (5).

~It is input to the reset human power R of FF5. Note that the circuit configuration of the low frequency oscillator (1) is not limited to the same, and for example, an astable multivibrator or the like may be used.

The high frequency oscillation part (2) is an inverter (2,), (22)
,...

It consists of a ring oscillator (2n) connected in an odd number of stages and a feedback loop, and an inverter (2+>
, (2□), . . . , (2n) are oscillated with a period determined according to the number of connected stages. This high frequency signal is
It is connected to the clock inputs T, ~T, of the D flip-flops 1FF, ~FFs in the pseudo-random pulse generator (5). The circuit configuration of the high frequency oscillator (2) is not limited to a ring oscillator, and any circuit configuration may be used as long as it generates a high frequency signal.

Note that in the embodiment circuit of FIG. 2, the signal mixing section (4) shown in the block diagram of FIG. 1 is not required;
The output signal of the low frequency oscillation section (1) is inputted to the reset input R of each D flip-flop FF, -FF5, thereby fulfilling the role of a signal mixing section (4).

This embodiment circuit can also be implemented as an IC using CMO8.

(Effects of the Invention) As described above, the present invention generates a pseudo random pulse by inputting the output signal from the high frequency oscillator to the pseudo random pulse generator, and uses this pseudo random pulse to generate a magnetic field. Since the coil is energized, it is possible to generate a high-frequency magnetic field with a pseudo-random frequency, making it difficult for the human body to get used to it, and by widening the frequency range of the generated magnetic field, it is possible to treat the human body. There is an effect that an increase in effectiveness can be expected.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a schematic configuration of the present invention, Fig. 2 is a circuit diagram of an embodiment of the invention, Figs. 3 to 5 are explanatory diagrams of the same operation, and Fig. 6 is a schematic diagram of a conventional example. FIG. 7 is a block diagram showing the configuration, FIG. 7 is a specific circuit diagram of the same as above, and FIG. 8 is an explanatory diagram of the same as above. (1) is a low frequency oscillation section, (2) is a high frequency oscillation section, (3)
(4) is a signal mixing section; and (5) is a pseudo-random pulse generating section.

Claims (1)

[Claims] (1) A high-frequency oscillation section that oscillates a high-frequency signal, a pseudo-random pulse generation section that generates pseudo-random pulses from the output signal of the high-frequency oscillation section, and a magnetic field generation section that generates a magnetic field according to the output signal of the pseudo-random pulse generation section. 1. A high-frequency magnetic therapy device comprising: a coil current-carrying section that feeds a current to the coil.