JP4462683B2 - Body fat measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a body fat measuring device for measuring the weight of a subject and measuring the amount of fat in the body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a body fat measuring device that measures body impedance values and body weight values and measures body fat mass using these measured values has been used. As this intracorporeal fat measuring device, for example, in Japanese Patent Laid-Open No. 62-169023, an electrode for a foot to be brought into contact with both feet is arranged on the surface of a weight scale, and the weight value is measured and the impedance value between the soles of both feet ( There has been proposed an apparatus for measuring body impedance values and calculating body fat mass using these body weight values, body impedance values, and personal data (age, sex, etc.) input in advance.
[0003]
Japanese Patent Application Laid-Open No. 11-113871 discloses a weight measurement unit (first measurement unit) for measuring a body weight value, and a hand electrode that is brought into contact with both hands, and an impedance value (internal impedance value) between both hands. A body fat measurement device has been proposed in which a body impedance measurement unit (second measurement unit) to be measured is connected by a cable. In this body fat measurement device, the body weight value measured by the body weight measurement unit is transmitted to the body impedance measurement unit via the cable, and the body impedance value and the body weight value measured by the body impedance measurement unit are used. The amount of fat in the body is calculated.
[0004]
Further, Japanese Patent Application Laid-Open No. 11-128197 discloses a body weight measurement unit (first measurement unit) for measuring a body weight value, a hand electrode that is detachably attached to the body weight measurement unit and makes contact with both hands, and the body weight. There has been proposed a body fat measurement device including a bar-shaped in-vivo impedance measurement unit (second measurement unit) including a wireless communication unit for taking in values. The body fat measuring device is configured so that the body impedance measuring unit is attached to the body weight measuring unit when not used or when measuring body weight alone, and the body impedance measuring unit is detached from the body weight measuring unit when measuring body fat. It is used in a state that That is, when performing body fat measurement, the body weight is measured by the body weight measurement unit when the subject rides on the body weight measurement unit while holding the body impedance measurement unit with both hands, and the body impedance is measured. After the body impedance value is measured by the measurement unit, the body impedance measurement unit captures the body weight value by wireless communication from the body weight measurement unit, and calculates the body fat mass using the body weight value and the body impedance value. To be displayed. When making the subject hold the in-vivo impedance measurement unit, it is necessary to dispose a light-receiving unit that reads the body weight value of the in-vivo impedance measurement unit and a light-emitting unit that transmits the body weight value of the body weight measurement unit. .
[0005]
In recent years, body weight and body fat percentage are useful indicators for determining the daily health level of an individual, so there is a need for a measuring device that can be easily carried and operated and that can easily read data such as measured values. ing. In addition, it is more useful if it has a function to measure body data related to various health such as time, number of walks, heart rate, blood pressure, etc., and it can be always carried or worn on the body. It is preferable that data such as measured values can be viewed.
[0006]
[Problems to be solved by the invention]
However, the body fat measuring device described in JP-A-62-169023 has a body fat measuring function for measuring body impedance in a weight scale, and the weight scale is a general floor-standing thin body weight. Since the measurement surface is close to the floor surface, it is difficult to set personal data input, and the measured body weight value and body fat value are displayed at low positions and are difficult to read. In addition, this internal fat measurement device cannot be used by removing only the internal impedance measurement function from the scale, is difficult to carry or carry, and is generally a stationary type. For this reason, there is a problem that it is impossible to add measurement functions of body data relating to various health such as time, number of walks, heart rate, and blood pressure.
[0007]
In addition, the body fat measuring device described in the above-mentioned Japanese Patent Application Laid-Open No. 11-113871 can set personal data in the in-vivo impedance measuring unit and can see the display of measured values at hand. Since the weight measuring unit and the weight measuring unit are connected by a cable, there is a problem that structural considerations are required for storing the electric wire when not in use. In addition, the detachable connector is attached to the in-vivo impedance measurement unit so that it can be detached from the body weight measurement unit, so that only the in-vivo impedance measurement unit can be carried or carried. There is a problem that the life of the connector contact portion is shortened.
[0008]
Furthermore, in the body fat measuring device described in the above-mentioned Japanese Patent Application Laid-Open No. 11-128197, the body impedance measuring unit can use only weak radio waves when taking in the body weight value from the body weight measuring unit by wireless communication. There is a problem that it is easy to receive noise. Further, in the case of optical communication, if there is something that physically blocks light between the transmitting and receiving elements, there is a problem that reading of the weight value becomes impossible and there is a limitation in use, which makes it difficult to use. Moreover, it may be difficult to make the light-receiving part provided in the in-vivo impedance measurement part mounted | worn in the test subject's arbitrary positions oppose the light-emitting part provided in a body weight measurement part.
[0009]
The present invention has been made to solve such problems, and it is easy to read the measurement value, and it is easy to read the measured value, and the weight value and the impedance value in the body are ensured without being affected by noise or the like with a simple structure without a cable or the like. It is an object of the present invention to provide a body fat measuring device capable of transmitting and receiving various body data related to health such as time, number of walks, heart rate, and blood pressure. .
[0010]
[Means for solving the problems and actions / effects]
  In order to achieve the aforementioned objectives,BookThe body fat measuring device according to the invention is:
  In a body fat measuring device that measures the amount of fat in the body,
(A1) a body weight measuring means for measuring the body weight value of the subject, and
(A2) Signal transmitting means for applying a current or voltage corresponding to the weight value measured by the weight measuring means to the subject
A first measurement unit comprising:
(B1) power supply applying means for applying a constant current or voltage to the subject;
(B2) voltage measuring means for measuring a voltage generated in the measurement target portion by application of current or voltage by the power supply means;
(B3) an in-vivo impedance calculating means for calculating an in-vivo impedance value based on the voltage measured by the voltage measuring means;
(B4) signal receiving means for measuring a voltage generated in the measurement target portion by application of current or voltage by the signal transmitting means;
(B5) The voltage measured by the signal receiving means is demodulated into a body weight value, and the body fat mass or body fat percentage is calculated based on the demodulated weight value and the body impedance value computed by the body impedance computing means. Arithmetic means for calculating at least one of them
Comprising a second measuring section comprising
  The voltage measuring means and the signal receiving means are shared by one generated voltage measuring circuit.
[0011]
  BookIn the invention, the body weight value of the subject is measured by the body weight measuring means, and a current or voltage corresponding to the body weight value is applied to the subject by the signal transmitting means. A voltage is generated in the measurement target portion by applying a current or voltage corresponding to the weight value, and the voltage value is measured by the signal receiving means. The voltage measured by the signal receiving means is input to the calculating means and demodulated into a weight value. In this way, the weight value measured by the first measurement unit is transmitted to the second measurement unit. On the other hand, in the second measurement unit, a constant current or voltage is applied to the subject by the power application unit, and the voltage generated in the measurement target unit by the application of the current or voltage is measured by the voltage measurement unit. Based on the voltage measured by the voltage measuring means, the internal impedance value is calculated by the internal impedance calculating means. The body fat mass is calculated based on the body weight value and the body impedance value thus obtained.
[0012]
  BookAccording to the invention, the weight value can be transmitted from the first measurement unit to the second measurement unit without receiving noise from other electronic devices, and the restriction on the opposing arrangement of the first measurement unit and the second measurement unit is possible. Since there is no need for a cable connecting the first measurement unit and the second measurement unit as provided in a conventional body fat mass measurement device, it is easy to handle during measurement and outside of measurement with a simple configuration. The effect that it is. In addition, the second measurement unit may be disposed at an arbitrary place where the subject can be contacted, and a signal input unit that inputs various signals related to the measurement of the body fat mass is attached to the second measurement unit, Furthermore, if a display unit for displaying each measurement value is provided, an effect of easy input operation and reading of the measurement result is obtained. Also,Since the voltage measuring means and the signal receiving means are configured to be shared by one generated voltage measuring circuit, the apparatus configuration can be simplified and the cost can be reduced.
[0013]
  In the present invention, the second measuring unit is a portable measuring unit that can be worn and carried by the subject and has various body data measurement functions related to health along with the body fat mass or body fat percentage. Is preferred. In this way, it is extremely useful as a measurement unit for health care.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the body fat measurement device according to the present invention will be described with reference to the drawings.
[0021]
  Figure1, the present inventiononeFIG. 2 is a diagram illustrating a state in which a subject measures body fat mass using the body fat measurement device according to the embodiment. FIG. 2 is a circuit diagram illustrating a portable measurement unit of the body fat measurement device. FIG. 2 shows circuit diagrams constituting the floor-mounted measuring unit of the body fat measuring device.
[0022]
  BookThe internal fat measurement device 1 of the embodiment includes a portable measurement unit (corresponding to the second measurement unit in the present invention) including four electrodes 2a, 2b, 3a, and 3b that are brought into contact with two (one pair) of each hand of the subject. 4) and a floor-mounted measuring unit (corresponding to the first measuring unit in the present invention) provided with a platform 7 on which two electrodes 5 and 6 that are brought into contact with both feet of the subject one by one are arranged on the upper surface. ) 8.
[0023]
The portable measuring unit 4 includes a setting value input unit (KEY) 9 for setting personal data (age, sex, etc.) of a subject and inputting a body fat mass measurement start signal, the personal data, and a measured weight value. And a first display unit (DIS) 10 for displaying the body fat value, and the left and right electrodes 2a and 3a apply a constant current between the electrodes 2a and 3a. (Corresponding to the power supply means in the present invention) connected to 11, a high input resistance differential amplifier circuit for measuring the voltage generated between the other electrodes 2b and 3b between the electrodes 2b and 3b (voltage measurement in the present invention) Means and a signal receiving means, that is, a generated voltage measuring circuit).
[0024]
The high input resistance differential amplifier circuit 12 is connected to an I / O circuit 17 via a rectifier circuit (REC) 13, a smoothing circuit (FIR) 14, an A / D converter 15 or a comparator (CMP) 16 in order. Yes. The I / O circuit 17 includes a CPU having a set value input unit 9, a first display unit 10, and a ROM / RAM memory (MEM) 18 for storing various data. 19) is connected.
[0025]
The constant current supply circuit 11 has a voltage V at a non-inverting input terminal.₁Is applied and constant current I₁Is connected to the inverting input terminal of the operational amplifier 20, and the constant current I is supplied from the operational amplifier 20.₁And the reference resistor Rs that limits the circuit current so that the analog switch AS is output between the output terminal of the operational amplifier 20 and the electrode 3a and between the inverting input terminal of the operational amplifier 20 and the electrode 2a.₁, AS₂Is arranged. These analog switches AS₁, AS₂Is controlled by the I / O circuit 17.
[0026]
The high input resistance differential amplifier circuit 12 includes three operational amplifiers 21a, 21b, and 21c and seven resistors r.₁~ R₇The voltage between the virtual points P and Q in the body (see FIG. 4) excluding the contact impedance between the electrode and the hand and the tissue impedance at the distal end of the hand is used as a differential voltage. taking measurement.
[0027]
Next, the circuit configuration of the floor-standing measuring unit 8 will be described. A weight sensor (in the present embodiment, a load cell (LD)) 22 is provided on the platform 7 of the floor-mounted measuring unit 8 and is configured to measure the weight applied to the platform 7. The weight sensor 22 is connected to an I / O circuit 26 via a weight signal amplifier 23, a smoothing circuit 24, and an A / D converter 25 in this order. The I / O circuit 26 displays a CPU 28 having a ROM / RAM memory (MEM) 27 for storing various data, an external signal input unit 29 for performing measurement start commands and other operations and settings, and a body weight value. A second display unit 30 is connected. The weight sensor 22, the weight signal amplifier 23, the smoothing circuit 24, and the A / D converter 25 correspond to weight measuring means in the present invention.
[0028]
The electrodes 5, 6 disposed on the mount 7 have a high-frequency alternating current I of about 50 KHz to 100 KHz between the electrodes 5, 6.₂Is connected to an alternating current supply circuit 31 (corresponding to a signal transmission means in the present invention) 31 for applying. The AC current supply circuit 31 has a constant AC voltage V applied to a non-inverting input terminal.₂Is applied and constant current I₂Is connected to the inverting input terminal of the operational amplifier 32, and the constant current I is output from the operational amplifier 32.₂And a reference resistor Rs33 that limits the circuit current so as to be output. The non-inverting input terminal of the operational amplifier 32 is connected to the analog switch AS.₃Through the constant AC voltage V₂Power supply (not shown) and analog switch AS₄The analog switch AS is connected to the ground via the₃, AS₄It is configured to be connected to either the power source or the ground by opening and closing. These analog switches AS₃, AS₄The I / O circuit 26 performs open / close control.
[0029]
The analog switch AS is connected between the inverting input terminal of the operational amplifier 32 and the electrode 5 and between the output terminal of the operational amplifier 32 and the electrode 6.₅, AS₆Is arranged. These analog switches AS₅, AS₆Is the analog switch AS₃, AS₄In the same manner, the opening / closing is controlled by the I / O circuit 26.
[0030]
FIG. 4 is an explanatory diagram for explaining the connection state of the impedance of the equivalent circuit of the body. The equivalent circuit of the body is composed of the leg impedance Ra including the contact impedance between the electrode 5 and the electrode 6 and the bottom surface of the foot, and the lower internal organ impedance R₁, Current flows through the leg impedance Rb including the contact impedance between the electrode 6 and the left foot surface, and the contact impedance, arm impedance Rc, upper visceral impedance R from the electrodes 2a, 2b to the electrodes 3a, 3b.₂, Arm impedance Rd, current flows through contact impedance, and the lower internal organ impedance R₁Both ends and upper internal impedance R₂Current flows through the body impedances Re and Rf in the longitudinal direction of the body. The arm impedance Rc and the upper internal impedance R₂The internal impedance consisting of the arm impedance Rd, that is, the internal virtual points P and Q, corresponds to the measurement target portion in the present invention.
[0031]
In the body fat measurement device 1 configured as described above, a subject inputs personal data to the portable measurement unit 4 and holds the portable measurement unit 4 so that a pair of electrodes are in contact with both hands. In this state, if the body is placed so that the left and right feet are in contact with the electrodes 5 and 6 on the platform 7, and the body fat measurement start signal is input from the set value input unit 9, the body fat measurement starts. Is done.
[0032]
In measuring the amount of fat in the body, first, the weight (body weight) applied to the platform 7 is measured by the weight sensor 22, and the weight signal output from the weight sensor 22 is amplified by the weight signal amplifier 23, After being smoothed by the smoothing circuit 24, it is digitized by the A / D converter 25 and transmitted as a weight value to the CPU 28 through the I / O circuit 26 and displayed on the second display unit 30. Is done.
[0033]
The digital value of the weight value transmitted to the CPU 28 is converted into 8-bit ASCII code to be transmitted data. In this transmission data, for example, when the weight value is 4 digits, a numerical value for 4 digits is converted into an ASCII code, and each numerical value is added with a start bit at the beginning of an 8-bit code and a parity bit and a stop bit at the end. In addition, an 11-bit start text code (STX) and an end text code (ETX) are added before and after the 4-digit numeric digits, for a total data structure of 6 digits and 66 bits.
[0034]
Next, a method for transmitting the weight value obtained by the floor-standing measuring unit 8 to the portable measuring unit 4 will be described. When the weight value is measured and transmission data is created, the analog switch AS is sent from the I / O circuit 26.₅, AS₆Is closed (ON), and then the analog switch AS according to the transmission data.₃, AS₄Opening / closing (ON / OFF) is controlled. Until the weight value is transmitted to the portable measuring unit 4, the analog switch AS₁, AS₂Is in an open (OFF) state, and the equivalent circuit of the body and the constant current supply circuit 11 are electrically insulated.
[0035]
Analog switch AS₃, AS₄The high-frequency alternating current I between the electrodes 5 and 6 that is in contact with both feet by opening and closing₂Is adjusted. That is, the transmission data is composed of 0 and 1, and when transmitting 0, the analog switch AS is used for a certain time t (msec).₃Is opened (OFF), and the analog switch AS₄Is closed (ON) and the high-frequency alternating current signal I is between the electrodes 5 and 6.₂The analog switch AS is transmitted for a certain time t (msec) when 1 is transmitted.₃Is closed (ON), and the analog switch AS₄Is in an open (OFF) state, and the high-frequency alternating current signal I is between the electrodes 5 and 6.₂Is applied.
[0036]
Thus, the electrodes 5 and 6 have a high frequency alternating current I₂Is applied, lower internal organ impedance R in the body₁Since the body impedances Re and Rf in the vertical direction are smaller than the impedance in the cross-sectional direction, the current flowing through the upper internal impedance R₂To the internal impedance R₂A voltage is generated at both ends. This internal organ impedance R₂Is measured by the high input resistance differential amplifier circuit 12 in the portable measuring unit 4.
[0037]
FIG. 5 is an explanatory diagram for explaining a procedure for receiving the transmission data and converting it into a weight value. Corresponding to the transmission data (FIG. 5 (a)), the analog switch AS every fixed time t (msec).₃, AS₄Is controlled so that the high frequency alternating current I to the electrodes 5 and 6 is controlled.₂Is adjusted. The high frequency alternating current I₂By visceral impedance R₂A voltage waveform (FIG. 5 (b)) of the voltage generated at both ends is measured by the high input resistance differential amplifier circuit 12. The voltage measured by the high input resistance differential amplifier circuit 12 is input to the rectifier circuit (REC) 13 and converted into a direct current (FIG. 5C), and then input to the smoothing circuit (FIR) 14. And smoothed (FIG. 5D). The signal smoothed by the smoothing circuit 14 is input to the comparator (CMP) 16 and pulsed by comparison with a preset threshold value Vs (FIG. 5 (e)), and the I / O circuit 17 is input to the CPU 19. The CPU 19 demodulates the pulsed signal into a serial bit signal (FIG. 5 (f)) and converts it into a weight value.
[0038]
The CPU 19 recognizes that the input of transmission data is started when the STX is input from the comparator 16, and recognizes that the input of the transmission data is completed when the ETX is input from the comparator 16. The bit signal is converted to weight value.
[0039]
Next, a method for measuring the in-vivo impedance value by the portable measuring unit 4 will be described. When the weight value transmitted from the floor-mounted measuring unit 8 is received as described above, the analog switch AS is operated by the I / O circuit 17.₁, AS₂Is closed (ON), and a constant current I is applied between the electrodes 2a and 3a respectively in contact with both hands from the constant current supply circuit 11.₁Is applied. The analog switch AS of the floor-mounted measuring unit 8₅, AS₆Is opened (OFF) when the transmission of the weight value is completed, and the equivalent circuit of the body and the high-frequency alternating current circuit 31 are electrically insulated.
[0040]
A constant current I between the electrodes 2a and 3a, that is, between both hands.₁Is applied, the arm impedance Rc, the upper internal impedance R₂A voltage is generated between the internal impedance consisting of the arm impedance Rd, that is, between the internal virtual points P and Q (see FIG. 4), and this voltage is measured by the high input resistance differential amplifier circuit 12. In this way, the voltage measured by the high input resistance differential amplifier circuit 12 is input to the rectifier circuit (REC) 13 to be converted into a direct current, and then input to the smoothing circuit (FIR) 14 to be smoothed. . The voltage signal smoothed by the smoothing circuit 14 is input to the A / D converter 15, digitized, and input to the CPU 19 via the I / O circuit 17.
[0041]
The CPU 19 generates a voltage value generated between the virtual points P and Q in the body (see FIG. 4) and a constant current value I applied between the electrodes 2a and 3a.₁Is used to calculate the body impedance value, and the body fat mass is calculated using the body impedance value, the body weight value, and the personal data.
[0042]
The body fat mass calculated in this way is output to the first display unit 10 of the portable measuring unit 4 and displayed as a digital value. In addition, the weight value measured and transmitted by the floor-standing measuring unit 8 is also displayed on the first display unit 10 as a digital value. The body fat percentage may be calculated and displayed instead of the body fat mass, or both the body fat mass and the body fat percentage may be computed and displayed. The first display unit 10 may display the body fat mass, the body fat percentage, the weight value, and the personal data all at the same time, or may display them by switching with a switching button or the like.
[0043]
FIG. 6 shows an analog switch AS by the CPU 19 of the portable measuring unit 4 and the CPU 28 of the floor-standing measuring unit 8.₁~ AS₆An explanatory view for explaining the ON / OFF control of FIG.
[0044]
The floor-standing measuring unit 8 uses the CPU 28 to convert the body weight value into transmission data and transmit it.₁And break mode M₂And the portable measuring unit 4 is controlled by the CPU 19 in the transmission mode M.₁Receiving mode M corresponding to₃And the rest mode M₂Measurement mode M corresponding to₄It is set so that it can be switched to. Each of these modes is executed mainly by the floor-mounted measuring unit 8 and by the portable measuring unit 4.
[0045]
In the floor-mounted measuring unit 8, weight measurement is always performed while the subject is on the platform 7, and the transmission mode M is performed.₁And break mode M₂And are automatically repeated. That is, when the power is turned on, the transmission mode M is measured while measuring the weight.₁And break mode M₂Is repeated. This transmission mode M₁Is a preset waiting time T₁All analog switches AS until₁~ AS₆Is turned off, then the analog switch AS₅, AS₆Is turned on and set time (transmission time) T₂Is held until elapses. Analog switch AS₅, AS₆As described above, the analog switch AS is₃, AS₄The transmission data is transmitted by switching between ON and OFF. The transmission time T₂After the elapse of the waiting time T₁Rest mode M after₂These waiting times T₁And break mode M₂Analog switch AS₃~ AS₆Is turned off.
[0046]
In the portable measuring unit 4, when a measurement start signal is input, a reception mode M₃The transmission data from the floor-mounted measuring unit 8 is waited, reception of transmission data is started by STX of the transmission data, and reception of transmission data is terminated by ETX of transmission data. After the reception of this transmission data, the waiting time T₁Measurement mode M when₄Is switched to. Measurement mode M₄The waiting time T₃Later analog switch AS₁, AS₂Is turned ON and set time (measurement time) T₄Is held until elapses. Analog switch AS₁, AS₂Is constant current I between the subject's hands while₁Is applied and the body impedance is measured. After the measurement of the internal impedance, the measurement time T₄After the elapse of time, the analog switch AS₁, AS₂Is turned off and waiting time T again₃Receive mode M after elapse of₃Is switched to.
[0047]
Thus, analog switch AS₁~ AS₆By performing the ON / OFF control, the body equivalent circuit can be used for transmitting the body weight value and measuring the body impedance. Transmission mode M₁And measurement mode M₄Analog switch AS before and after₁~ AS₆Waiting time T to turn off all₁, T₃And set the constant current I₁And high frequency alternating current I₂Are not added at the same time so that an accurate signal can be read.
[0048]
In this way, the body fat mass or body fat percentage is calculated using the body weight value transmitted at regular intervals T and the measured body impedance, and the body fat mass or body fat percentage and body weight value are displayed on the first display 10. Is displayed. Transmission mode M₁In the above, for example, if the body weight value is not input for a certain period of time such as when the subject gets off the platform 7, the measurement of the body fat mass is completed. The weight value is detected stably, and if the weight value is stable and larger than a specified value, the measurement mode M₂The body fat percentage is calculated using the body impedance and personal data obtained in step 1 above.
[0049]
According to this embodiment, the transmission mode M₁And break mode M₂The switching interval T is set to 0.1 sec. That is, the alternating current I₂If the frequency is 50 KHz and one period is 20 μsec and the time interval t between ON and OFF of 1 bit is 1 msec, 1 bit includes 1 msec / 20 μsec = 50 periods. Therefore, since the transmission data (the weight value numerical value is 4 digits) is 66 bits, the transmission time T required to transmit one batch data.₂Is 66 msec. Transmission mode M₁Waiting time T₁And measurement mode M₄Waiting time of 17 msec, measurement time T₄Is set to 66 msec, the transmission mode M is set every 0.1 sec.₁And break mode M₂Are switched. The waiting time T₁, T₂And measurement time T₄Can be set arbitrarily and the transmission mode M₁And break mode M₂And the switching interval T do not necessarily coincide with each other. The transmission time T₂Is the alternating current I₂It can be changed according to the frequency.
[0050]
  BookAccording to the embodiment, since the portable measuring unit 4 measures the voltage generated by applying a current to the subject, the weight value is transmitted from the floor-standing measuring unit 8. A cable or the like that connects the portable measuring unit 4 and the floor-standing measuring unit 8 provided in the body fat mass measuring device is not required, and a simple configuration can be achieved. In addition, as mentioned in the problem of the body fat mass measurement device in which the weight value is transmitted by the conventional wireless communication, the floor-mounted measurement unit 8 and the portable type are not affected without receiving noise from other electronic devices. Since there is no restriction | limiting on opposing arrangement | positioning with the measurement part 4, there exists an effect that the handling at the time of a measurement is easy.
[0051]
  Also,BookAccording to the embodiment, a single high input resistance differential amplifier circuit 12 can receive transmission data corresponding to a body weight value and measure a voltage for calculating an in-body impedance value. Since it is not necessary to provide the circuit which has, the portable measuring part 4 can be reduced in size and cost can be reduced. Furthermore, since the measured body weight value and body fat mass or body fat percentage can be displayed at hand (portable measurement unit 4), there is an effect that each measurement value can be easily read.
[0052]
  BookIn the embodiment, the analog switch AS is used during transmission data transmission.₁, AS₂Is configured to be in an OFF state, but the analog switch AS₁, AS₂Any one of the above may be provided so as to be in the OFF state. When measuring internal impedance, analog switch AS₅, AS₆Is configured to be in an OFF state, but the analog switch AS₅, AS₆Any one of the above may be provided so as to be in the OFF state.
[0070]
  SaidIn an embodiment, the portable measuring unit4Can be equipped with various health-related body data measurement functions such as a clock, pedometer, heart rate, blood pressure, etc., and can always be carried around. For example,FIG.(A) (b) includes the portable measuring unit.4A perspective view (a) and a back view (b) of a wristwatch 80 having the above function are shown. The wristwatch 80 has a pair of current application electrodes 81 and 81 and voltage measurement electrodes 82 and 82 mounted on the front and back of the main body (or band). The wristwatch is worn on the arm, and the current application electrode 81 and the voltage measurement electrode 82 on the surface of the main body are pressed with the other hand, and the current application electrode 81 and the voltage measurement electrode 82 on the back surface of the main body are brought into close contact with the arm. If you get on the floor-mounted measuring unit 8SaidThe same effect as the embodiment can be obtained.. AlsoThe portable measuring unit4May be of a card type as described in JP-A-11-70092. In this case, the card-type portable measuring unit can be easily worn and carried.4The floor-mounted measuring unit with the electrode held8If you rideSaidThe same effect as the embodiment can be obtained.
[0071]
  SaidIn the embodiment, the transmission data consisting of 0 and 1 bits representing the body weight value and the body impedance is converted into an alternating current I at a constant time t.₂, I₃The PCM method of adjusting and transmitting the application is adopted, but not limited to this, for example,FIG.As shown in the figure, a time t corresponding to each predetermined numerical value from 0 to 9₀, T₁, ... t₉Only analog switch AS₃Or analog switch AS₇Is turned on and the analog switch AS₄Or analog switch AS₈The analog switch AS is turned off only for a time td of a predetermined length to represent between numerical digits.₃Or analog switch AS₇Is turned off and the analog switch AS₄Or analog switch AS₈Is turned on and the application of alternating current is adjusted, thereby the upper internal impedance R₂Alternatively, a method may be employed in which the voltage generated in the pulse is read and pulsed, and the pulse length is recognized and digitized. Also, a method of transmitting in correspondence with two types of frequency signals may be adopted so that 0 bit is 10 KHz, 1 bit is 50 KHz, and each is demodulated to 0 and 1 on the reading side. .
[0072]
  SaidIn an embodiment, an electrode5, 6AC current supply circuit31Is configured so that transmission data corresponding to the body weight value and the body impedance value is transmitted from the AC current, but a constant voltage is applied to the electrode instead of the AC current.5, 6Each transmission data can be transmitted even if it is applied to. In this case, the upper internal impedance R₂The voltage generated at each electrode5, 6The weight value signal varies depending on the contact impedance value between the body and the body surface.19Comparator at input to16Should be pulsed correctly. For this reason, the high input resistance differential amplifier12If a gain of a certain level or more is provided, the upper internal impedance R when an alternating current corresponding to transmission data is applied₂The voltage generated in the circuit increases or decreases depending on the difference in the contact impedance value, and the comparator16Even if the input signal to becomes smaller, if it is higher than the threshold value Vs, it is converted into a correct pulse signal.
[0073]
  SaidIn an embodiment, a constant current is applied between two electrodes, and a virtual point inside the bodyP, QThe four-terminal method is used to calculate the internal impedance value by measuring the voltage between the two, but not limited to this, the impedance value between the two hands or the impedance between the two feet by the measurement method based on the two-terminal method or the two-terminal method A value may be calculated. The measurement method based on the two-terminal method is a method in which an electric current is applied between electrodes that are in contact with two body end tissues sandwiching a body tissue to be measured. First, the contact impedance between the electrode and the skin A voltage Va generated in the total impedance of the contact impedance and the body end tissue impedance is measured by applying a current only to a total portion of the body end tissue impedance, and subsequently, the contact impedance, the body end tissue impedance and the body impedance are measured. A voltage Vb generated by applying a current to the total portion is measured. In this method, the voltage generated only in the internal impedance is calculated by calculating the voltage Vb−Va, and the internal impedance is calculated from the value. In this case, a voltage may be applied between the electrodes instead of the current. Further, the total impedance of the contact impedance between the electrode and the skin and the body end tissue impedance, and the total impedance of the contact impedance, the body end tissue impedance and the body impedance correspond to the measurement target part in the present invention.
[0075]
  Also,SaidIn the embodiment, when measuring the body fat mass, it is configured to measure the weight value, but not limited thereto, the portable measuring unit4The body weight value transmitted to the body may be stored, and when the amount of body fat is measured, the stored body weight value may be used for calculation.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a state in which a subject measures body fat mass using the body fat measurement device according to the first embodiment of the present invention.
FIG. 2 is a circuit diagram constituting a portable measuring unit of the body fat measuring device according to the first embodiment.
FIG. 3 is a circuit diagram constituting a floor-standing measurement unit of the body fat measurement device according to the first embodiment.
FIG. 4 is an explanatory diagram for explaining a connection state of an equivalent circuit impedance of the body.
FIGS. 5A to 5F are explanatory diagrams for explaining a procedure for receiving transmission data and converting it into a weight value. FIG.
FIG. 6 is an explanatory diagram for explaining ON / OFF control of an analog switch of the body fat measurement device according to the first embodiment.
[Fig. 7]FIG.These are explanatory drawing (a) (b) explaining another aspect of a portable measuring part.
[Fig. 8]FIG.These are explanatory drawings explaining another aspect of the transmission system of transmission data.
[Explanation of symbols]
  1 Body fat measuring device
  2a, 2b, 3a, 3b, 5, 6 electrodes
  4                                Portable measuring unit
  7                                Platform
  8                                Floor-mounted measuring unit
  9                                Set value input section
10                                1st display
11 Constant current supply circuit
12                                High input resistance differential amplifier
13                                Rectifier circuit
14, 24                          Smoothing circuit
15, 25                          A / D converter
16                                comparator
17                                I / O circuit
18, 27                          ROM / RAM memory
19, 28                          CPU
20, 21a, 21b, 21c, 32  Operational amplifier
22                                Weight sensor
23                                Weight signal amplifier
29                                External signal input section
30                                Second display section
31                                AC current supply circuit
33                                Reference resistance
80 watches
81 Electrode for current application
82 Electrode for voltage measurement

Claims (2)

In a body fat measuring device that measures the amount of fat in the body,
(A1) a weight measuring means for measuring the weight value of the subject, and (a2) a first measuring section comprising a signal transmitting means for applying a current or voltage corresponding to the weight value measured by the weight measuring means to the subject;
(B1) power supply applying means for applying a constant current or voltage to the subject;
(B2) voltage measuring means for measuring a voltage generated in the measurement object portion by application of current or voltage by the power supply means;
(B3) In-body impedance calculating means for calculating an in-vivo impedance value based on the voltage measured by the voltage measuring means,
(B4) signal receiving means for measuring a voltage generated in the measurement target portion by application of current or voltage by the signal transmitting means, and (b5) demodulating the voltage measured by the signal receiving means into a body weight value, A second measuring unit comprising a calculating means for calculating at least one of body fat mass and body fat percentage based on the weight value and the body impedance value calculated by the body impedance calculating means,
A body fat measuring device, wherein the voltage measuring means and the signal receiving means are shared by a single generated voltage measuring circuit. 2. The portable measuring unit according to claim 1, wherein the second measuring unit is a portable measuring unit that can be worn and carried by the subject and has a function of measuring various body data related to health along with the body fat mass or body fat percentage. body fat measurement device.

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