JP2012034847A - Body composition and weight measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body composition and weight measuring device which can improve the frequency of shortening a period of time required to measure the impedance and weight of the user.SOLUTION: The body composition and weight measuring device includes a first measuring part for measuring the impedance of a living body, and a second measuring part for measuring the weight of the living body. A period from the time when the measuring of the weight by the second measuring part is begun until the time when the change in weight is predicted to stabilize is assumed as a stability prediction period, and an impedance measurement is begun in the stability prediction period.

Description

  The present invention relates to a body composition weight measuring apparatus including a first measuring unit that measures impedance of a living body and a second measuring unit that measures body weight of the living body.

The thing of patent document 1 is known as an example of the said body composition weight measuring apparatus.
In this apparatus, the weight is measured after the user puts his / her foot on the second measuring unit, and the impedance is measured after the measurement of the weight is completed. Then, after the measurement of weight and impedance is completed, the measurement result is displayed on the display unit.

JP 2001-104273 A

  By the way, when the user measures impedance and body weight using the body composition weight measurement device, the posture of the user is not stable for a while after the feet are put on the measurement unit, so the measured value of the body weight also depends on this. fluctuate.

  Therefore, in a general body composition weight measurement device, measurement of weight is started after a predetermined time has elapsed since the user put his foot on the measurement unit. In addition, although the said patent document 1 is not specified about this point, it is thought that the same structure is employ | adopted from technical common sense.

  For this reason, the time taken to measure impedance and body weight is the time from when the user puts his / her foot on the measurement unit until the predetermined time elapses, the time from the start to the end of the weight measurement, and the impedance measurement. It is the sum of the time from the start to the end.

  On the other hand, from the viewpoint of the convenience of the body composition weight measurement device, it is desirable to provide the user with measurement results as soon as possible, but the conventional body composition weight measurement device cannot complete the measurement in a time shorter than the above time. .

  This invention is made in view of such a situation, The objective is to provide the body composition weight measuring apparatus which can raise the frequency by which the time concerning the measurement of a user's impedance and a body weight is shortened. is there.

Hereinafter, means for achieving the above object will be described.
The body composition weight measurement device of the present invention is a body composition weight measurement device including a first measurement unit that measures the impedance of a living body and a second measurement unit that measures the body weight of the living body, and the weight by the second measurement unit. The period from when the measurement is started until the change in weight is predicted to be stable is defined as the stable prediction period, and the impedance measurement is started within this stable prediction period.

-In this body composition weight measuring apparatus, it is preferable that the measurement of a body weight is started after progress of the said stability prediction period.
-In this body composition weight measuring apparatus, when the measurement of impedance is completed within the stable prediction period, it is preferable that the measurement of body weight is started within the subsequent stable prediction period.

  In this body composition weight measurement device, when the stable prediction period has elapsed and the impedance measurement is not completed, the impedance measurement is temporarily suspended and the weight measurement is started. Preferably, the impedance measurement is resumed after the measurement is completed.

-In this body composition weight measuring apparatus, it is preferable that the impedance measurement and the body weight measurement are alternately performed within the stable prediction period.
In this body composition weight measuring device, at least one of the following first measurement process and second measurement process is performed, that is, (a) “calculate the difference between two impedance data, and the calculated difference is the first (B) a first measurement process in which at least one of the two data is stored in the memory when the value is equal to or less than the reference value, and the impedance measurement is completed when the number of stored impedance data is equal to or greater than the first predetermined number “Calculate the difference between the two body weight data, and store at least one of the two data in the memory when the calculated difference is less than or equal to the second reference value, and the number of stored body weight data is greater than or equal to the second predetermined number. It is preferable that at least one of the “second measurement process for completing the weight measurement” is performed.

  In this body composition body weight measurement device, when the impedance measurement is completed before the body weight measurement, only the latter measurement of the impedance measurement and the body weight measurement is performed thereafter. When the measurement is completed prior to the measurement, it is preferable that only the former measurement of the impedance measurement and the weight measurement is performed thereafter.

  ADVANTAGE OF THE INVENTION According to this invention, the body composition weight measuring apparatus which can raise the frequency by which the time concerning the measurement of a user's impedance and a body weight is shortened can be provided.

The front view which shows the front structure about the body composition weight measuring apparatus of one Embodiment of this invention. The block diagram which shows the circuit structure of the body composition weight measuring apparatus of the embodiment. The flowchart which shows a part of the procedure about "the body composition weight measurement process" performed by the body composition weight measurement apparatus of the embodiment. The flowchart which shows a part of the procedure about "the body composition weight measurement process" performed by the body composition weight measurement apparatus of the embodiment. The timing chart which shows an example of the execution aspect about "the body composition weight measurement process" of the embodiment. The graph which shows an example of the measurement aspect of an impedance and a body weight about the body composition weight measuring apparatus of other embodiment of this invention. The graph which shows an example of the measurement aspect of an impedance and a body weight about the body composition weight measuring apparatus of other embodiment of this invention. The graph which shows an example of the measurement aspect of an impedance and a body weight about the body composition weight measuring apparatus of other embodiment of this invention. The graph which shows an example of the measurement aspect of an impedance and a body weight about the body composition weight measuring apparatus of other embodiment of this invention.

An embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, the front structure of the body composition weight measuring apparatus 1 is shown.
The body composition weight measuring device 1 displays and inputs various information, a placement unit 10 on which a user puts his / her foot, a power switch 14 for turning on and off the power of the body composition weight measuring device 1, and so on. And an information unit 20 for.

  The mounting unit 10 includes a current applying electrode 11 for applying a current to the user's foot, a voltage measuring electrode 12 for measuring the impedance in contact with the user's foot, and a load sensor for measuring the body weight. 13 is provided. The current application electrode 11 and the voltage measurement electrode 12 also serve as a mark indicating the position where the user places his / her foot on the placement unit 10. The voltage measurement electrode 12 corresponds to a first measurement unit, and the load sensor 13 corresponds to a second measurement unit.

  The information unit 20 includes a display unit 21 for displaying various types of information, a basic information input unit 22 for registering gender, height, and age as user information, and a user for calling up registered user data. A selector 23 is provided.

With reference to FIG. 2, the circuit configuration of the body composition weight measuring apparatus 1 will be described.
Inside the body composition weight measuring device 1, there are a control unit 30 that performs various calculations and controls, an A / D conversion unit 31 that performs A / D conversion on the outputs of the voltage measurement electrode 12 and the load sensor 13, an arithmetic expression and A memory 32 for storing information such as data is provided. Further, a current supply unit 15 is provided as a power source for supplying current to the control unit 30.

  The control unit 30 is electrically connected to the current application electrode 11, the display unit 21, the basic information input unit 22, the user selection unit 23, the current supply unit 15, and the memory 32. The voltage measurement electrode 12, the load sensor 13, and the memory 32 are electrically connected to the A / D conversion unit 31.

  The control unit 30 transmits a command signal for energizing the living body to the current application electrode 11. In addition, a command signal for displaying various information is transmitted to the display unit 21. In addition, the A / D conversion unit 31 transmits a command signal for changing the type of output voltage for A / D conversion to the A / D conversion unit 31. Also, the information transmitted from each of the basic information input unit 22 and the user selection unit 23 is received.

  Various information and calculation results are transmitted from the control unit 30 to the memory 32. Further, the voltage value after A / D conversion is transmitted from the A / D conversion unit 31. The data transmitted to the memory 32 is stored in the memory 32. The memory 32 stores an arithmetic expression used for the calculation of the control unit 30 in advance. Data stored in the memory 32 is read by the control unit 30 as necessary.

  The A / D conversion unit 31 performs the first measurement state in which only the former A / D conversion is performed among the output voltage of the voltage measurement electrode 12 and the output voltage of the load sensor 13 by the control unit 30 or only the latter A / D conversion. It is switched to the second measurement state to be performed. When the A / D conversion unit 31 is in the first measurement state, the output voltage of the voltage measurement electrode 12 is A / D converted by the conversion unit 31 and stored in the memory 32 as an impedance value. When the A / D converter 31 is in the second measurement state, the output voltage of the load sensor 13 is A / D converted by the converter 31 and stored in the memory 32 as a load value.

Impedance is measured as follows.
When the user's feet are placed on the current application electrode 11 and the voltage measurement electrode 12, a current is supplied between the user's feet by the current application electrode 11. Further, the voltage of the current flowing between both feet is measured by the voltage measuring electrode 12. Then, the voltage measured by the voltage measurement electrode 12 is input to the A / D conversion unit 31.

  In the A / D converter 31, the voltage input from the voltage measurement electrode 12 is converted into an impedance value, which is a digital signal, for each predetermined period SA. The converted impedance value is stored in the memory 32. Note that the start of impedance measurement means that A / D conversion of the output voltage of the voltage measurement electrode 12 is started by the A / D converter 31.

  The control unit 30 sets the impedance value within the predetermined range RA as a “normal impedance value” and refers to the impedance value stored in the memory 32 to make the next determination. That is, it is determined whether or not the number of normal impedance values continuously measured (hereinafter, “normal data number NA”) is equal to or greater than the determination number NAX. If the number is equal to or greater than the determination number NAX, the normal impedance value of the normal data number NA is determined. The average value is calculated. Then, this average value is determined as an impedance measurement value (hereinafter referred to as “impedance measurement value”). Next, various biological information (for example, body fat percentage and muscle mass) is calculated based on the impedance measurement value. Various biological information calculated based on the impedance measurement value is displayed on the display unit 21 as a measurement result.

Body weight is measured as follows.
When the user's feet are placed on the current application electrode 11 and the voltage measurement electrode 12, the output voltage of the load sensor 13 changes according to the weight of the user. Then, the voltage measured by the load sensor 13 is input to the A / D conversion unit 31.

  In the A / D converter 31, the voltage input from the load sensor 13 is converted into a load value that is a digital signal every predetermined period SB. The converted load value is stored in the memory 32. The start of weight measurement means that the A / D conversion unit 31 starts A / D conversion of the output voltage of the load sensor 13.

  The control unit 30 sets the load value within the predetermined range RB as the “normal load value”, and performs the next determination with reference to the load value stored in the memory 32. That is, it is determined whether or not the number of normal load values continuously measured (hereinafter, “normal data number NB”) is equal to or greater than the determination number NBX. If the number is equal to or greater than the determination number NBX, the load value of the normal data number NB is determined. The average value is calculated. Then, this average value is determined as a measurement value of the load value (hereinafter, “weight measurement value”). The weight measurement value is displayed on the display unit 21 as a measurement result.

  With reference to FIG. 3 and FIG. 4, the content of the “body composition weight measurement process” that defines the procedure for measuring impedance and body weight will be described. This process is performed by the control unit 30. Moreover, it is started when the power switch 14 is turned on by the user, and is ended after the process has proceeded to the last step.

The control unit 30 performs the following processes as “body composition weight measurement process”.
When it is determined in step S110 that the user selection unit 23 has not been operated, the determination process in step S110 is performed again after a predetermined calculation cycle has elapsed. If the condition for shifting to the process of step S120 is not satisfied even after a certain time has elapsed since the start of the “body composition weight measurement process”, the power switch 14 is turned off.

  When it is determined in step S110 that the user selection unit 23 has been operated, user data corresponding to the button of the user selection unit 23 operated by the user is read from the memory 32 in step S120. Further, the load sensor 13 is calibrated and “0.0 Kg” is displayed on the display unit 21.

  In step S130, it is determined whether or not the user is in a measurement state. Here, based on the fact that the output voltage of the load sensor 13 shows a value within a predetermined range, it is determined that the user is in a measurement state, that is, that both feet of the user are placed on the placement unit 10.

  When it is determined in step S130 that the user is not in the measurement state, the determination process in step S130 is performed again after a predetermined calculation cycle has elapsed. If the condition for shifting to the process of step S140 is not satisfied even after a certain time has elapsed since the start of the “body composition weight measurement process”, the power switch 14 is turned off.

  When it is determined in step S130 that the user is in the measurement state, impedance measurement is started in step S140. That is, the A / D conversion unit 31 is set to the first measurement state, and the output voltage of the voltage measurement electrode 12 is converted into an impedance value.

  In step S150, it is determined whether or not the normal data number NA is greater than or equal to the determination number NAX, that is, whether or not a condition for determining the impedance measurement value is satisfied. This determination is made with reference to the impedance value stored in the memory 32.

  When it is determined in step S150 that the normal data number NA is greater than or equal to the determination number NAX, in step S160, an average value of normal impedance values of the normal data number NA is calculated, and this average value is determined as an impedance measurement value. The determined impedance measurement value is stored in the memory 32.

  In step S170, it is determined whether or not an elapsed time (hereinafter referred to as “measurement time TA”) after starting the impedance measurement is equal to or longer than the stable prediction period TX, that is, whether or not a condition for permitting the start of the weight measurement is satisfied. Determine whether.

  The stable prediction period TX is a period predicted to be necessary until the user's posture is stabilized after the user's both feet are placed on the placement unit 10, that is, until the change in the user's weight is stabilized, and is set in advance. Is stored in the memory 32. In general, when the measurement time TA is less than the stable prediction period TX, the posture of the user is not stable. Therefore, if the output voltage of the load sensor 13 at this time is used for calculating the weight measurement value, the accuracy of the weight measurement value is lowered. . Therefore, in the “body composition weight measurement process”, the load value that appropriately reflects the weight of the user is used to calculate the weight measurement value by performing the determination process in step S170.

  When it is determined in step S150 that the normal data number NA is less than the determination number NAX, it is determined in step S180 whether or not the measurement time TA is equal to or longer than the stable prediction period TX.

  When it is determined in step S180 that the measurement time TA is less than the stable prediction period TX, the determination process in step S150 is performed again after a predetermined calculation period has elapsed. That is, the acquisition of the impedance value is continued until a condition permitting the start of weight measurement is satisfied.

  When it is determined in step S180 that the measurement time TA is equal to or longer than the stable prediction period TX, the acquisition of the impedance value is temporarily interrupted in step S190. That is, the energization of the living body by the current application electrode 11 or the A / D conversion of the output voltage by the A / D conversion unit 31 is temporarily interrupted.

  After the process of step S170 or step S190, measurement of body weight is started in step S200. That is, the A / D conversion unit 31 is set to the second measurement state, and the output voltage of the load sensor 13 is converted into a load value.

  In step S210, it is determined whether or not the number of normal data NB is greater than or equal to the determination number NBX, that is, whether or not a condition for determining the weight measurement value is satisfied. This determination is made with reference to the load value stored in the memory 32.

  When it is determined in step S210 that the normal data number NB is greater than or equal to the determination number NBX, in step S220, an average value of normal load values of the normal data number NB is calculated, and this average value is determined as a weight measurement value. The determined weight measurement value is stored in the memory 32.

  In step S230, it is determined whether or not the impedance measurement value is confirmed. That is, it is determined whether or not the normal data number NA equal to or greater than the determination number NAX is obtained by the impedance measurement performed during the stable prediction period TX.

  When it is determined in step S230 that the impedance measurement value is not fixed, the impedance measurement is restarted in step S240. That is, the A / D conversion unit 31 is set to the first measurement state, and the output voltage of the voltage measurement electrode 12 is converted into an impedance value.

In step S250, it is determined whether or not the following three (condition A) to (condition C) are satisfied. That is, it is determined whether or not a condition for determining the impedance measurement value is satisfied. This determination is made with reference to the impedance value stored in the memory 32. The determination number NAY is set as a value smaller than the determination number NAX.
(Condition A) The normal data number NA (hereinafter, “initial measurement normal data number NA1”) obtained in the stable prediction period TX is equal to or greater than the determination number NAY.
(Condition B) The normal data number NA obtained by the impedance measurement after resumption (hereinafter, “restart measurement normal data number NA2”) is equal to or greater than the determination number NAY.
(Condition C) The sum of the initial measurement normal data number NA1 and the restart measurement normal data number NA2 (hereinafter, “total normal data number NA3”) is equal to or greater than the determination number NAX.

  When it is determined in step S250 that the total normal data number NA3 is less than the determination number NAX, the determination process in step S250 is performed again after a predetermined calculation cycle has elapsed. That is, the acquisition of the impedance value is continued until the condition for determining the impedance measurement value is satisfied.

  When it is determined in step S250 that the total normal data number NA3 is greater than or equal to the determination number NAX, in step S260, an average value of normal impedance values of the total normal data number NA3 is calculated, and this average value is determined as an impedance measurement value. To do. The determined impedance measurement value is stored in the memory 32.

  In step S270, various biological information is calculated based on the user data, the impedance measurement value, and the weight measurement value. In step S280, the content of the calculated biological information and the fact that the measurement is completed are displayed on the display unit 21.

  The calculated biological information includes, for example, “BMI”, “body fat rate”, “muscle level”, “basal metabolism”, “visceral fat level”, “subcutaneous fat rate”, “bone mass”, “body” Examples include “composition age” and “balance age”.

With reference to FIG. 5, an example of an execution mode of the “body composition weight measurement process” will be described.
First, among the items in FIG. 5, (B) “user state” and (C) “electrode output voltage A / D conversion” and (D) “sensor output voltage A / D conversion”. It supplements about an item.

  The “measurement state” of “user state” indicates a state where both feet of the user are placed at correct positions with respect to the current application electrode 11 and the voltage measurement electrode 12. The “non-measurement state” indicates a state in which both feet of the user are different from the measurement state.

  “Execution” of “electrode output voltage A / D conversion” means that the A / D conversion unit 31 is set to the first measurement state and the output voltage of the voltage measurement electrode 12 is A / D converted. Indicates the state. “Stop” indicates a state in which A / D conversion of the output voltage of the voltage measurement electrode 12 is not performed.

  “Execution” of “A / D conversion of sensor output voltage” is a state in which the A / D conversion unit 31 is set to the second measurement state and A / D conversion of the output voltage of the load sensor 13 is performed. Indicates. “Stop” indicates a state in which A / D conversion of the output voltage of the load sensor 13 is not performed.

An example of the measurement mode is shown below.
It is assumed that the user's state changes from the non-measurement state to the measurement state at time t1. At this time, impedance measurement is started. That is, the output voltage of the voltage measurement electrode 12 is converted into an impedance value and stored in the memory 32.

  It is assumed that the measurement time TA counted with respect to the time t1 reaches the stable prediction period TX at the time t2. At this time, if the impedance measurement value is not fixed, the impedance measurement is temporarily suspended and the weight measurement is started. That is, the output voltage of the load sensor 13 is converted into a load value and stored in the memory 32.

  It is assumed that the weight measurement value is confirmed at time t3. At this time, the measurement of the weight is finished and the measurement of the impedance is restarted. That is, the output voltage of the voltage measurement electrode 12 is converted into an impedance value and stored in the memory 32.

  It is assumed that the impedance measurement value is confirmed at time t4. At this time, the measurement of the impedance and the measurement result of the biological information including the weight are displayed on the display unit 21.

  It is assumed that the user who confirmed the measurement result of the biological information gets off the placement unit 10 at time t5. That is, it is assumed that the user's state has changed from the measurement state to the non-measurement state. At this time, the user who has finished measuring the biometric information switches the power switch 14 off.

According to the body composition weight measuring apparatus 1 of the present embodiment, the following effects can be obtained.
(1) The body composition weight measuring apparatus 1 is provided with a voltage measuring electrode 12 for measuring the impedance of a living body and a load sensor 13 for measuring the weight of the living body. Then, the period from when the measurement of the weight by the load sensor 13 is started until the change in the weight is predicted to be stable is defined as the stable prediction period TX, and the impedance of the living body is measured by the voltage measurement electrode 12 within the stable prediction period TX. Is started.

  According to this configuration, the frequency at which the impedance measurement is completed earlier is higher than in a device that does not measure both impedance and body weight (hereinafter, “virtual measurement device”) during the stable prediction period TX. For this reason, it is possible to increase the frequency with which the time taken to measure the impedance and weight of the user is shortened.

  Specifically, when the impedance measurement value is determined within the stable prediction period TX, the measurement of both the impedance and the body weight is completed when the body weight measurement is completed. For this reason, as compared with a virtual measurement device in which measurement of impedance is started after completion of measurement of body weight, time required for measurement of impedance and weight of the user is shortened.

  On the other hand, when the impedance measurement is not completed in the stable prediction period TX, the impedance measurement is resumed after the weight measurement is completed. Then, when the measurement of the impedance is completed by the measurement after the restart, the measurement of both the impedance and the weight is completed. In this case, the number of normal impedance values that need to be acquired after completion of the measurement of the body weight (hereinafter referred to as “required number for late measurement”) is smaller than the determination number NAX. Here, also in the virtual measurement device, it is assumed that the normal data number NA is equal to or greater than the determination number NAX is the impedance measurement completion condition. Compared with this virtual measurement device, the number of late measurement required for the body composition weight measurement device 1 is smaller than the number of late measurement required for the virtual measurement device. For this reason, the time taken to measure the impedance and weight of the user is shortened.

  When the user is in the measurement state, the contact state between the voltage measurement electrode 12 and the sole may not be stable. In this case, the normal data number NA may not reach the determination number NAX within the stable prediction period TX.

  (2) In body composition weight measuring apparatus 1, measurement of body weight is not started until measurement time TA is equal to or longer than stable prediction period TX. Thereby, it can suppress that the measurement precision of a body weight falls.

(3) In the body composition weight measuring apparatus 1, the output voltage of the voltage measurement electrode 12 and the output voltage of the load sensor 13 are A / D converted by one A / D conversion unit 31.
As a result, an A / D conversion unit for A / D converting the output voltage of the voltage measuring electrode 12 and an A / D conversion unit for A / D converting the output voltage of the load sensor 13 are provided. This simplifies the configuration of the device.

(Other embodiments)
In addition, the embodiment of the present invention is not limited to the embodiment exemplified in the above-described embodiment, and can be implemented by changing it as shown below, for example. The following modifications are not applied only to the above-described embodiment, and different modifications can be combined with each other.

-About (condition B) of the "body composition weight measurement process" of the said embodiment, the content can also be changed like the following (condition B1) or (condition B2).
(Condition B1) The restart measurement normal data number NA2 is equal to or larger than the value obtained by subtracting the initial measurement normal data number NA1 from the determination number NAX.
(Condition B2) The number of normal impedance values obtained by impedance measurement after resumption is equal to or greater than the value obtained by subtracting the initial measurement normal data number NA1 from the determination number NAX.

  When the above (Condition B1) or (Condition B2) is adopted, the required number of late measurement, which is the number of normal impedance values that need to be acquired after restarting the measurement, differs depending on the number of initial measurement normal data number NA1. . Then, as the number of the same data number NA1 increases, the required number for later measurement decreases. For this reason, when compared with the virtual measuring device, the frequency of the impedance measurement time performed after the measurement of the weight is completed is increased. This can increase the frequency with which the time taken to measure the impedance and weight of the user is shortened.

  The measurement mode of impedance and body weight can be changed as shown in FIG. 6C and FIGS. 6A and 6B correspond to the measurement mode of the above embodiment.

(Measurement mode of FIG. 6)
FIG. 6 shows a measurement mode in which impedance measurement is started when it is determined that the user's state is the measurement state. In this measurement mode, specifically, impedance and body weight are measured as follows.

  As shown in FIG. 6A, when it is determined that the measurement state is set at time t11, measurement of impedance is started. Then, when the impedance measurement is not completed by time t12 when the stable prediction period TX elapses, the weight measurement is started. The impedance measurement is resumed at time t13 when the weight measurement is completed. Then, the impedance measurement is completed at time t14 when the necessary number of normal impedance values for the latter period are acquired.

  As shown in FIG. 6B, when it is determined that the measurement state is set at time t11, measurement of impedance is started. When the measurement of impedance is completed at time t15 before the stable prediction period TX elapses, the measurement of impedance and body weight is not performed until time t12 when the stable prediction period TX elapses. Then, the measurement of the body weight is started at time t12 when the stable prediction period TX has elapsed, and the measurement of the body weight is completed at time t13 when the normal load value of the determination number NB is acquired.

  As shown in FIG. 6C, when the measurement state is determined at time t11, measurement of impedance is started. Then, when the measurement of impedance is completed at time t15 before the stable prediction period TX elapses, measurement of weight is started. Then, the measurement of the weight is completed at time t16 when the normal load value of the determination number NB is acquired.

  Incidentally, when the posture of the user in the measurement state is extremely stable, the accuracy of the weight measurement value does not greatly decrease even if the weight measurement is started within the stable prediction period TX. FIG. 6C shows a measurement mode when the user's posture is extremely stable as described above. In this case, since the weight is measured within the stable prediction period TX, the time required for measuring the impedance and the weight of the user is further shortened.

  In the configuration in which the weight measurement is started within the stable prediction period TX, it is preferable to determine that the user's posture is extremely stable before the weight measurement is started. As the method, for example, it is determined that the posture is extremely stable based on the fact that the state in which the fluctuation range of the output voltage of the load sensor 13 is smaller than the determination value continues for a certain period or longer. Can be mentioned. In addition to this, there is one that determines that the posture is extremely stable based on the fact that the state in which the change rate of the output voltage of the load sensor 13 is smaller than the determination value continues for a certain period or longer.

(Measurement mode of FIG. 7)
FIG. 7 shows a measurement mode in which the measurement of impedance is started when a predetermined time has elapsed since it is determined that the user's state is the measurement state. In this measurement mode, specifically, impedance and body weight are measured as follows.

  As shown in FIG. 7 (a), when it is determined that the measurement state is present at time t21, and it is determined that a predetermined time shorter than the stable prediction period TX has elapsed from the determination at time t22, Measurement starts. Then, when the impedance measurement is not completed by time t23 when the stable prediction period TX elapses, the measurement of the body weight is started. The impedance measurement is resumed at time t24 when the weight measurement is completed. Then, the impedance measurement is completed at time t25 when the required number of normal impedance values for the latter period are acquired.

  As shown in FIG. 7B, it is determined that the measurement state is set at time t21, and that a predetermined time shorter than the stable prediction period TX shorter than the stable prediction period TX has elapsed from the same determination at time t22. When it is determined, impedance measurement is started. When the measurement of impedance is completed at time t26 before the stable prediction period TX elapses, the measurement of impedance and body weight is not performed until time t23 when the stable prediction period TX elapses. Then, measurement of weight is started at time t23 when the stable prediction period TX has elapsed, and measurement of weight is completed at time t24 when the normal load value of the determination number NB is acquired.

  As shown in FIG. 7 (c), when it is determined that the measurement state is set at time t21, and when it is determined that a predetermined time has elapsed since the determination at time t22, measurement of impedance is started. Then, when the measurement of impedance is completed at time t26 before the stable prediction period TX elapses, the measurement of weight is started. Then, the measurement of the weight is completed at time t27 when the normal load value of the determination number NB is acquired.

Note that FIG. 7C shows a measurement mode when the user's posture is extremely stable. In this case, since the weight is measured within the stable prediction period TX, the time required for measuring the impedance and the weight of the user is further shortened.
(Measurement mode of FIG. 8)
FIG. 8 shows a measurement mode in which impedance or body weight measurement is started when it is determined that the user's state is the measurement state, and impedance and body weight measurements are alternately performed. In this measurement mode, specifically, impedance and body weight are measured as follows. Note that FIG. 8 shows an example in which measurement of impedance or body weight is started when it is determined that the user's state is the measurement state. The measurement can also be started when a short predetermined time has elapsed.

  As shown in FIG. 8A, when it is determined at time t31 that the measurement state is established, the measurement of impedance and weight is started and the measurement of impedance and weight is alternately performed. That is, the acquisition of the impedance value over the predetermined time TZA and the measurement of the load value over the predetermined time TZB are alternately performed. Although FIG. 8 shows an example in which the impedance measurement is performed first, it can be changed to a configuration in which the weight measurement is performed first. In addition, the predetermined time TZA and the predetermined time TZB are set as times necessary for acquiring only one sample of the impedance value and the load value, respectively, but each time is set to a time required for acquiring a plurality of samples. It can also be changed.

  If the measurement of impedance and weight is not completed by time t32 when the stable prediction period TX elapses, the measurement of impedance and weight is continued after time t32. If a normal load value equal to or greater than the determination number NBX is obtained at time t33, the weight measurement value is determined at this time. If a normal impedance value equal to or greater than the determination number NAX is obtained at time t34, the impedance value is determined at this time. In this measurement method, the impedance and body weight are alternately measured after time t33 when the body weight measurement value is determined.

  As shown in FIG. 8B, when it is determined that the measurement state is set at time t31, the measurement of impedance and body weight is started and the measurement of impedance and body weight are alternately performed. That is, the acquisition of the impedance value over the predetermined time TZA and the measurement of the load value over the predetermined time TZB are alternately performed.

  If a normal impedance value equal to or greater than the determination number NAX is obtained at time t35 before the stable prediction period TX elapses, the impedance measurement value is determined at this time. The impedance and body weight are not measured from time t35 to time t32 when the stable prediction period TX elapses. At time t32, the measurement of impedance and weight is resumed, and the measurement of impedance and weight is alternately performed. If a normal load value equal to or greater than the determination number NBX is obtained at time t33, the weight measurement value is determined at this time.

  As shown in FIG. 8C, when it is determined that the measurement state is set at time t31, the measurement of the impedance and the weight is started and the measurement of the impedance and the weight is alternately performed. That is, the acquisition of the impedance value over the predetermined time TZA and the measurement of the load value over the predetermined time TZB are alternately performed.

  If a normal impedance value equal to or greater than the determination number NAX is obtained at time t35 before the stable prediction period TX elapses, the impedance measurement value is determined at this time. After time t35, the measurement of impedance and weight is continued and the measurement of impedance and weight is alternately performed. If a normal load value equal to or greater than the determination number NBX is obtained at time t36, the weight measurement value is determined at this time.

  FIG. 8C shows a measurement mode in the case where the user's posture is extremely stable. In this case, since the weight is measured within the stable prediction period TX, the time required for measuring the impedance and the weight of the user is further shortened.

(Measurement mode of FIG. 9)
FIG. 9 shows a measurement mode in which impedance or body weight measurement is started when it is determined that the user is in the measurement state, and impedance and body weight measurements are alternately performed. In this measurement mode, specifically, impedance and body weight are measured as follows. FIG. 9 shows an example in which the measurement of the impedance or the body weight is started when it is determined that the user's state is the measurement state. However, after the determination that the user's state is the measurement state, the stable prediction period TX is exceeded. The measurement can also be started when a short predetermined time has elapsed.

  As shown in FIG. 9A, when it is determined at time t41 that the measurement state is established, the measurement of impedance and body weight is started and the measurement of impedance and body weight are alternately performed. That is, the acquisition of the impedance value over the predetermined time TZA and the measurement of the load value over the predetermined time TZB are alternately performed. Although FIG. 9 shows an example in which the impedance measurement is performed first, it can be changed to a configuration in which the weight measurement is performed first. In addition, the predetermined time TZA and the predetermined time TZB are set as times necessary for acquiring only one sample of the impedance value and the load value, respectively, but each time is set to a time required for acquiring a plurality of samples. It can also be changed.

  When the measurement of impedance and weight is not completed by time t42 when the stable prediction period TX elapses, the measurement of impedance and weight is continued after time t42. If a normal load value equal to or greater than the determination number NBX is obtained at time t43, the weight measurement value is determined at this time, and the weight measurement is terminated. If a normal impedance value equal to or greater than the determination number NAX is obtained at time t44, the impedance value is determined at this time. In this measurement method, only the impedance is measured after time t43 when the weight measurement value is determined.

  As shown in FIG. 9B, when it is determined that the measurement state is set at time t41, the measurement of impedance and body weight is started and the measurement of impedance and body weight are alternately performed. That is, the acquisition of the impedance value over the predetermined time TZA and the measurement of the load value over the predetermined time TZB are alternately performed.

  If a normal impedance value equal to or greater than the determination number NAX is obtained at time t45 before the stable prediction period TX elapses, the impedance measurement value is determined at this time. The impedance and body weight are not measured from time t45 to time t42 when the stable prediction period TX elapses. Thereafter, only the measurement of the weight is resumed at time t42. If a normal load value equal to or greater than the determination number NBX is obtained at time t43, the weight measurement value is determined at this time.

  As shown in FIG. 9C, when it is determined at time t41 that the measurement state is established, the measurement of impedance and weight is started and the measurement of impedance and weight is alternately performed. That is, the acquisition of the impedance value over the predetermined time TZA and the measurement of the load value over the predetermined time TZB are alternately performed.

  If a normal impedance value equal to or greater than the determination number NAX is obtained at time t45 before the stable prediction period TX elapses, the impedance measurement value is determined at this time. If a normal load value equal to or greater than the determination number NBX is obtained at time t46, the weight measurement value is determined at this time. In this measurement method, only the weight is measured after time t45 when the impedance measurement value is determined.

  FIG. 9C shows a measurement mode in the case where the user's posture is extremely stable. In this case, since the weight is measured within the stable prediction period TX, the time required for measuring the impedance and the weight of the user is further shortened.

In the above embodiment, the impedance value within the predetermined range RA is set as the normal impedance value, and the impedance measurement value is determined based on the impedance value. However, the impedance measurement value is determined as in (A) or (B) below. You can also.
(A) A difference between two impedance values adjacent to each other in sampling time is calculated, and when the absolute value of the difference is equal to or less than a reference value, both of the two impedance values are set as normal impedance values. When the number of normal impedance values continuously measured (normal data number NA) is equal to or greater than the determination number NAX, an average value of normal impedance values of the normal data number NA is determined as an impedance measurement value.
(B) A difference between two impedance values adjacent to each other at the sampling time is calculated, and one of the two impedance values is set as a normal impedance value when the absolute value of the difference is equal to or less than a reference value. When the number of normal impedance values (normal data number NA) measured within a preset determination period is equal to or greater than the determination number NAX, an average value of normal impedance values of the normal data number NA is determined as an impedance measurement value. .

In the above embodiment, the load value within the predetermined range RB is set as the normal load value, and the weight measurement value is determined based on the load value. However, the weight measurement value is determined as in (A) or (B) below. You can also.
(A) A difference between two load values adjacent to each other in sampling time is calculated, and when the absolute value of the difference is equal to or less than a reference value, both of the two load values are set as normal load values. When the number of normal load values continuously measured (normal data number NB) is equal to or greater than the determination number NBX, the average value of normal load values of the normal data number NB is determined as the weight measurement value.
(B) A difference between two load values adjacent to each other in sampling time is calculated, and when the absolute value of the difference is equal to or less than a reference value, one of the two load values is set as a normal load value. When the number of normal load values (normal data number NB) measured within a preset determination period is equal to or greater than the determination number NBX, the average value of normal load values of the normal data number NB is determined as the weight measurement value. .

In the above-described embodiment, the output voltage of the voltage measurement electrode 12 is converted into an impedance value by the A / D conversion unit 31, but can be changed as follows.
That is, the output voltage of the voltage measuring electrode 12 can be converted into a digital output voltage by the A / D conversion unit 31, and the output voltage can be converted into an impedance value by the calculation of the control unit 30.

In the above embodiment, the output voltage of the load sensor 13 is converted into a load value by the A / D conversion unit 31, but can be changed as follows.
That is, the output voltage of the load sensor 13 can be converted into a digital output voltage by the A / D conversion unit 31, and the output voltage can be converted into a load value by the calculation of the control unit 30.

  In the above-described embodiment, the current application electrode 11 and the voltage measurement electrode 12 are provided as the first measurement unit that measures impedance. However, the first measurement unit may be modified as follows. That is, instead of or in addition to the above electrodes, a hand electrode for energizing the user's hand and an electrode for measuring the voltage of the current flowing through the hand can be provided.

  DESCRIPTION OF SYMBOLS 1 ... Body composition weight measuring apparatus, 12 ... Voltage measurement electrode (1st measurement part), 13 ... Load sensor (2nd measurement part).

Claims (7)

In a body composition weight measuring apparatus including a first measuring unit that measures the impedance of a living body and a second measuring unit that measures the weight of the living body,
The period from when the measurement of the weight by the second measurement unit is started until the change in weight is predicted to be stable is defined as a stable prediction period, and the impedance measurement is started within the stable prediction period. Body composition weight measuring device. The body composition weight measuring device according to claim 1,
The body composition weight measurement apparatus, wherein measurement of body weight is started after the stable prediction period has elapsed. The body composition weight measuring device according to claim 2,
When the measurement of impedance is completed within the stable prediction period, the body weight measurement is started within the subsequent stable prediction period. In the body composition weight measuring device according to claim 2 or 3,
When the stable prediction period has elapsed and the impedance measurement is not completed, the impedance measurement is temporarily suspended and the weight measurement is started, and the impedance measurement is resumed after the weight measurement is completed. A body composition body weight measuring device. The body composition weight measuring device according to claim 1,
The body composition weight measurement apparatus, wherein impedance measurement and body weight measurement are alternately performed within the stable prediction period. The body composition weight measuring device according to claim 5,
At least one of the following first measurement process and second measurement process is performed. (A) “Calculate a difference between two impedance data, and if the calculated difference is less than or equal to a first reference value, One is stored in the memory, and the first measurement process completes the impedance measurement when the number of stored impedance data is the first predetermined number or more.
(B) “Calculate the difference between the two weight data, and store the at least one of the two data in the memory when the calculated difference is equal to or smaller than the second reference value, and the number of stored weight data is the second Second measurement process for completing weight measurement when the number is equal to or greater than a predetermined number "
The body composition weight measuring apparatus characterized by the above-mentioned. The body composition weight measuring device according to claim 5 or 6,
When the impedance measurement is completed before the body weight measurement, only the latter measurement of the impedance measurement and the body weight measurement is performed thereafter, and when the body weight measurement is completed before the impedance measurement, The body composition weight measuring apparatus is characterized in that only the former measurement of impedance measurement and body weight measurement is performed.

Images