JP6480112B2 - Activity amount detection device - Google Patents

Description

  The present invention relates to an activity amount detection apparatus that detects an activity amount by specifying an activity state mainly involving body movement of a measurement subject.

  Pedometers, activity meters, and the like are widely known as devices (activity amount detection devices) that measure energy consumed by a person to be measured for exercise (activity) such as walking. Such an activity amount detection device recognizes exercise such as walking and running from information such as an acceleration sensor and a vibration sensor attached to a measurement subject, and the weight, height, body fat rate, etc., which are input to the device in advance. Together with the information, energy consumption due to exercise can be calculated and the calculated value can be displayed.

  By the way, recently, a semiconductor acceleration sensor having a detection capability in the three-axis directions with low cost and low power consumption has become widespread, and an activity amount detection device such as a pedometer or activity meter using the same has become common. An active mass detection device using such an acceleration sensor not only distinguishes walking and running, but also identifies the vertical direction by identifying the direction of gravitational acceleration at rest, and moves up and down such as up and down stairs. It has become possible to detect the movement distance in the plane direction. However, when the posture of the sensor itself changes during the movement of the measurement subject, it is difficult for the activity amount detection device to detect separately the acceleration due to the movement and the acceleration of gravity, and it is difficult to detect the vertical direction change. Further, when the activity amount detection device is attached to the measurement subject so that the posture of the sensor does not change, the activity amount detection device restricts the movement of the measurement subject or gives the measurement subject discomfort. For this reason, even if the said active mass detection apparatus tried to detect the moving direction and distance of a measuring subject using an acceleration sensor, it was not able to detect with sufficient precision.

  Therefore, a technique is known in which only a vertical movement is separated and detected using an atmospheric pressure sensor (see Patent Document 1). According to the activity amount detection apparatus according to the technology, since the atmospheric pressure changes depending on the altitude, only the movement in the vertical direction can be separated and detected by measuring the atmospheric pressure with the atmospheric pressure sensor. In other words, according to the activity detection device according to the above technique, the movement (walking, running, etc.) of the measurement subject is measured by the acceleration sensor, and the movement and moving distance (movement of the stairs and slopes, etc.) in the height direction are measured by the atmospheric pressure sensor. As a result, it is possible to calculate accurate energy consumption even for an exercise that involves an upward movement that consumes energy.

Japanese Patent Laid-Open No. 11-347021

By the way, in the activity amount detection apparatus according to the above technique, a semiconductor absolute pressure sensor is generally used as the atmospheric pressure sensor. For this reason, since the activity amount detection device according to the above technique detects a change in height based on a change in absolute pressure, for example, when a pressure drop occurs due to a weather change such as an approach such as a typhoon, As a result, it is determined that the height change of the minute has occurred, and as a result, there is a problem that the energy consumption due to the exercise is erroneously calculated.
Therefore, the present invention provides an activity amount detection apparatus that can detect an accurate activity amount of a measurement subject.

In order to solve the above problem, the first feature of the activity amount detection device of the present invention is an activity amount detection device that is attached to a measurement subject and detects an activity amount based on the activity state of the measurement subject, An activity state identifying unit that identifies a category of the activity state of the measurement subject, a vertical motion detection unit that detects vertical movement information related to the vertical movement of the measurement subject, and a category identified by the activity state identifying unit An up-and-down movement information detected by the up-and-down movement detection unit, and an arithmetic processing unit that calculates an amount of activity according to the activity state of the measurement subject. The gist is to have a pressure sensor capable of detecting a pressure change according to the activity of the subject as a difference amount from a reference pressure that varies according to atmospheric pressure fluctuation.
According to such a feature, the activity amount detection device can detect a change in pressure according to the activity of the measurement subject as a difference amount from the reference pressure that varies according to the atmospheric pressure fluctuation. Even when the atmospheric pressure changes due to the weather conditions, it is possible to detect only the accurate amount of activity based on the activity of the person being measured without misidentifying the energy consumption due to exercise.

In addition, a second feature of the activity amount detection apparatus according to the present invention is that the pressure sensor includes a cavity having a predetermined volume and a pressure transmission medium that transmits a measurement target pressure that is a pressure around the measurement target person. And an output section that outputs an output signal related to a differential pressure between the internal pressure corresponding to the reference pressure and representing the internal pressure of the cavity, and the pressure to be measured.
According to such a feature, the activity amount detection device can identify a change in atmospheric pressure accompanying vertical movement by detecting a differential pressure inside and outside the cavity. Since the internal pressure (internal pressure) of the cavity changes behind the atmospheric pressure fluctuation due to the flow of the pressure transmission medium through the communication hole, the pressure change due to weather conditions can be detected by detecting the differential pressure inside and outside the cavity. Even if it occurs, it is not calculated by misidentifying the energy consumed by exercise. Therefore, the activity amount detection device can detect only an accurate activity amount based on the activity of the measurement subject.

Further, the third feature of the activity amount detection device of the present invention is that the vertical movement information is information related to the vertical movement direction of the measurement subject determined by the vertical movement detection unit based on an output signal of the pressure sensor. It is made to include.
According to such a feature, since the output signal of the pressure sensor shows a minute fluctuation of the atmospheric pressure, it can be detected that the atmospheric pressure slightly increases or decreases based on the change of the output signal. For this reason, even if a measurement subject performs very slight up-and-down movement, the activity amount detection apparatus can be regarded as a change in atmospheric pressure, and can detect an accurate activity amount of the measurement subject.

Further, a fourth feature of the activity amount detection device of the present invention is that the vertical motion detection unit is configured to detect the vertical movement of the measurement subject based on a comparison between a value of the output signal of the pressure sensor and a predetermined value. The gist is to determine the moving direction.
According to this feature, the activity amount detection device can determine whether or not the measurement subject has moved up and down by a predetermined amount or more based on a comparison between the output signal of the pressure sensor and a predetermined value. Therefore, the activity amount detection device can set a predetermined exercise intensity and determine whether or not a vertical movement based on the exercise intensity has been performed.

In addition, according to a fifth feature of the activity amount detection apparatus of the present invention, the up / down movement information includes an output signal output from the output unit, and the arithmetic processing unit performs the measurement based on the output signal. The gist is to calculate the amount of vertical movement of the subject.
According to such a feature, the activity amount detection device can detect the amount of change in atmospheric pressure by the arithmetic processing unit based on the output signal of the pressure sensor, and thus detects the movement distance in the vertical direction of the measurement subject. be able to. For this reason, the activity amount detection device can accurately detect the activity amount based on the vertical movement from the vertical movement distance of the measurement subject based on the detection result of the pressure sensor.

Further, a sixth feature of the activity amount detection device of the present invention is that the arithmetic processing unit is set with a differential pressure calculation unit for obtaining a differential pressure between the internal pressure and the measurement target pressure based on the output signal. Based on the internal pressure and the differential pressure calculated by the differential pressure calculation unit, a measurement target pressure calculation unit that calculates the measurement target pressure, and based on the differential pressure calculated by the differential pressure calculation unit A flow rate calculation unit that calculates a flow rate of the pressure transmission medium flowing in and out of the cavity in a predetermined time unit, and the flow rate calculated by the flow rate calculation unit and the volume of the cavity. The gist of the invention is to include an internal pressure update unit that calculates the internal pressure and updates a set value of the internal pressure used in the measurement target pressure calculation unit with the calculated internal pressure.
According to this feature, the activity amount detection device can calculate the amount of time change in the measurement target pressure based on the output signal of the pressure sensor. For this reason, the up-and-down movement distance before and behind the activity of the measurement subject can be detected, and the amount of activity can be accurately detected.

In addition, a seventh feature of the activity amount detection device of the present invention is that the pressure sensor has a cantilever that is provided so as to close an opening surface of the cavity excluding the communication hole and bends and deforms according to the differential pressure. The output unit outputs an output signal corresponding to the amount of bending deformation of the cantilever.
According to such a feature, the activity amount detection device can measure a change in atmospheric pressure accompanying vertical movement by detecting a differential pressure from the inside of the cavity, and at the same time, appropriately adjust the thickness of the cantilever for atmospheric pressure measurement. Thus, pressure fluctuation can be detected with a desired sensitivity. For this reason, even a slight vertical movement can be detected, and the energy consumption at that time can be accurately calculated.

The eighth feature of the activity amount detection device of the present invention is summarized as that the activity state includes a walking state, a light work state, a running state, and a resting state.
According to such a feature, the activity amount detection device calculates the activity amount by classifying the activity state into subtle states such as a walking state, a light work state, a running state, and a resting state. Can be detected.

Further, a ninth feature of the activity amount detection device of the present invention is that it includes a biological information acquisition unit that detects biological information of the measurement subject having a correlation with the activity state, and the arithmetic processing unit includes the classification Further, the gist is to calculate the amount of activity based on the biological information in addition to the vertical movement information.
According to such a feature, the activity amount detection device can detect an activity amount using biological information correlated with an activity state even when a change in atmospheric pressure without vertical movement, such as entering and exiting an air-conditioned building, is applied. By performing the calculation, it is possible to avoid misidentifying the vertical movement. For this reason, it becomes possible to calculate correctly the energy consumption of a measurement subject.

In addition, a tenth feature of the activity amount detection device of the present invention is that the biological information acquisition unit detects at least one of heart rate, body temperature, sweating amount, and respiratory rate as the biological information. To do.
According to this feature, the activity amount detection device can detect the activity amount using various biological information such as the above-described heartbeat, body temperature, sweating amount, and respiration rate.

The eleventh feature of the activity amount detection device of the present invention is summarized as having a communication unit that transmits the activity amount calculated by the arithmetic processing unit to the outside of the activity amount detection device.
According to this feature, the activity amount detection device can confirm the activity amount in detail with an external electronic device (such as a personal computer or a portable electronic device) without providing a display device in the activity amount detection device itself. For this reason, it becomes possible to reduce the size of the activity amount detection device itself.

  According to the activity amount detection apparatus according to the present invention, it is possible to detect an accurate activity amount of the measurement subject.

It is a block diagram of the activity amount detection apparatus which concerns on 1st embodiment of this invention. It is a top view of the pressure sensor with which the active mass detection apparatus of FIG. 1 is equipped. It is sectional drawing of the pressure sensor shown in FIG. It is a figure which shows an example of the output of the pressure sensor shown in FIG. It is a figure which shows an example of operation | movement of the pressure sensor shown in FIG. It is a flowchart which shows the flow of the process which the arithmetic processing circuit shown in FIG. 1 performs. It is explanatory drawing which shows the flow of the process which the arithmetic processing circuit of the active mass detection apparatus which concerns on 2nd embodiment of this invention performs. It is explanatory drawing which shows the flow of the process which calculates the moving amount | distance of the up-down direction which the arithmetic processing circuit shown in FIG. 7 performs. It is a block diagram of the active mass detection apparatus which concerns on 3rd embodiment of this invention. It is explanatory drawing which shows the flow of the process which the arithmetic processing circuit shown in FIG. 9 performs. It is a block diagram which shows the modification of the active mass detection apparatus which concerns on this invention.

Hereinafter, an embodiment of an activity amount detection apparatus according to the present invention will be described with reference to the drawings.
(First embodiment)
(overall structure)
FIG. 1 is a diagram showing a configuration of an activity amount detection apparatus 1 according to the present invention. Here, the activity amount detection device 1 detects an activity amount such as calorie consumption (energy consumption) based on the activity of the measurement subject (for example, walking, running, light work, etc.), exercise intensity, and the number of steps up and down the stairs. Thus, this is a device for informing the measurement subject of the detection result.

  As shown in FIG. 1, the activity amount detection device 1 of the present embodiment includes an exercise status acquisition unit 20 for acquiring the exercise status of the measurement subject, and vertical movement acquisition for detecting the vertical movement of the measurement subject. An arithmetic processing circuit 40 that is connected to the unit 30, the exercise status acquisition unit 20 and the vertical movement acquisition unit 30, and performs various arithmetic processes based on the information acquired by the exercise status acquisition unit 20 and the vertical movement acquisition unit 30; And a display device 50 that is connected to the arithmetic processing circuit 40 and displays the processing result of the arithmetic processing circuit 40.

  The exercise status acquisition unit 20 includes an acceleration sensor 21 and an exercise determination unit 22. The vertical movement acquisition unit 30 includes a pressure sensor 31 and a vertical movement determination unit 32. The arithmetic processing circuit 40 is connected to the motion determination means 20, the vertical movement determination means 30, and the display device 50.

  The acceleration sensor 21 is, for example, a sensor composed of a detection method such as a MEMS capacitance detection method or a piezoresistive method that is advantageous for downsizing. The acceleration sensor 21 detects acceleration representing the movement of the measurement subject, and inputs the detected acceleration information (acceleration information) to the motion determination means 22.

  The motion determination unit 22 is connected to the acceleration sensor 21 and includes a CPU, a RAM, a ROM, and the like. The CPU develops and executes various control programs stored in the ROM on the RAM, thereby executing the acceleration sensor 21. Various control processes for the output signal are realized. The motion determination means 22 classifies the motion status of the person to be measured into, for example, steps such as walking, running, light work, and rest based on the input acceleration information (specifically, information on the classified motion status (specifically, Outputs numerical data allocated in accordance with each exercise status category) as exercise status information. Specifically, the exercise determination means 22 determines one of the exercise status categories by determining which one of the numerical ranges previously determined for each category corresponds to the acceleration value related to the input acceleration information. Identify.

  The pressure sensor 31 detects a change in pressure around the measurement subject at the same time that the acceleration sensor 21 detects acceleration information. Here, the pressure change detected by the pressure sensor 31 is a change in atmospheric pressure around the measurement target (starting / stopping of air conditioning, entering / exiting a building, a change in atmospheric pressure caused by weather change) and a vertical direction of the measurement target (gravity acceleration). Direction) and pressure change due to movement. Then, pressure change information representing the pressure change detected by the pressure sensor 31 is input to the vertical movement determination means 32. Here, the specific configuration and function of the pressure sensor 31 will be described in detail later, but a pressure change according to the activity of the measurement subject is detected as a difference amount from a reference pressure that varies according to the atmospheric pressure fluctuation. it can.

  The vertical movement determination unit 32 is connected to the pressure sensor 31 and includes a CPU, a RAM, a ROM, and the like. The CPU expands and executes various control programs stored in the ROM on the RAM, thereby executing the pressure sensor. Various control processes for the 31 output signals are realized. The vertical movement determination unit 32 determines that the pressure change information input from the pressure sensor 31 is all due to the vertical movement of the measurement target person, determines the vertical movement direction of the measurement target person, and outputs the vertical movement information. Specifically, the vertical movement determination means 32 indicates, for example, that the pressure change information output from the pressure sensor 31 indicates that the surrounding atmospheric pressure change (output signal value of the pressure sensor 31) is higher than a predetermined value. If it is information, it is judged that the altitude of the measurement subject has decreased. Similarly, the vertical movement determination means 32 determines that the altitude of the measurement subject has increased when the surrounding atmospheric pressure change is information indicating a decrease of a predetermined value or more, and the surrounding atmospheric pressure change is a predetermined value. If the information represents the range (rise / decrease below a predetermined value), it is determined that the altitude of the measurement subject has not changed.

  That is, according to the vertical movement determination means 32, the CPU outputs the vertical movement information determined based on the pressure change information output from the pressure sensor 31, and records it in the RAM or ROM as necessary.

  The arithmetic processing circuit 40 is a circuit including a CPU, a RAM, a ROM, and the like. The CPU develops and executes various control programs stored in the ROM on the RAM, and performs various operations of the activity amount detection device 1. By implementing the control process, the activity amount detection apparatus 1 is controlled in an integrated manner. When the arithmetic processing circuit 40 receives the output signal (exercise status information) of the exercise determination means 22 and the output signal (vertical movement information) of the up / down movement determination means 32, the subject to be measured is based on the output signal. The calorie consumption calculation process corresponding to the exercise status is executed. Specifically, when the arithmetic processing circuit 40 determines that the exercise state of the measurement subject is a walking or running category based on the output signal of the exercise determination unit 22, the calculation processing circuit 40 outputs it from the vertical movement determination unit 32. The vertical movement direction based on the walking or running of the measurement subject is specified by the vertical movement information. And the arithmetic processing circuit 40 performs the arithmetic processing which adds the calorie based on the said up-down direction movement to the calorie consumption, such as a walk on the flat ground and a run calculated from exercise state information. Specifically, when the arithmetic processing circuit 40 determines that it is an upward movement and walking, the arithmetic processing circuit 40 adds an amount of about twice the consumed energy to the energy consumed for walking on a flat ground. In addition, when the arithmetic processing circuit 40 determines that the movement is downward and walking, the arithmetic processing circuit 40 adds about 0.1 times the consumption energy to the consumption energy of the flat ground walking. In addition, although the relationship between the calorie consumption of walking on a flat ground or running on flat ground and the energy consumption in each case such as climbing stairs and running up stairs is strictly different depending on the individual to be measured, generally METs (Metabolic equivalences) And “Energy consumption from daily activities” (Sports Science Committee of the Japan Sports Association). On the other hand, when the arithmetic processing circuit 40 determines that the exercise status of the measurement subject is a light work or resting category based on the output signal of the exercise determination unit 22, the calculation processing circuit 40 outputs the output signal of the vertical movement determination unit 32. The calorie consumption based is output without being added to the calorie consumption calculated from the exercise status information. That is, the arithmetic processing circuit 40 outputs the calorie consumption during light work or rest calculated from the exercise status information output by the exercise determination unit 22.

  The display device 50 is a display device configured with, for example, a liquid crystal display. The display device 50 receives the output signal of the arithmetic processing circuit 40 and displays the calorie consumption calculated by the arithmetic processing circuit 40 and various exercise information.

  For this reason, the arithmetic processing circuit 40 moves up and down to calculate whether or not the measurement subject is exercising including vertical movement from the pressure change of the pressure sensor 31 as to whether or not the movement is in the vertical direction that consumes more calories. It can discriminate | determine from information and exercise status information, and can calculate the exact calorie consumption based on a discrimination | determination result.

  In addition, since the arithmetic processing circuit 40 can simultaneously specify the exercise status of the person to be measured even if the pressure fluctuation occurs, the calculation calorie consumption includes the pressure change not related to the exercise caused by the elevator lift or the air conditioning start / stop. It is possible to reduce the calorie consumption error without calculation.

(Configuration of pressure sensor)
Next, a detailed configuration of the pressure sensor 31 that configures the vertical movement acquisition unit 30 will be described.
Here, FIG. 2 is a plan view showing a configuration of the pressure sensor 31. FIG. 3 is a cross-sectional view of the pressure sensor 31 along the line AA shown in FIG.

  The pressure sensor 31 is a sensor that detects pressure fluctuations in a predetermined frequency band (for example, 0.05 Hz to 10 kHz), and includes a sensor main body 33, an atmospheric pressure measurement cantilever 34, a lid portion 312, and a displacement measurement portion 35. And have.

  The sensor body 33 has a cavity 310 therein. The sensor main body 33 divides the cavity 310 and is disposed on the first portion 33-1 made of resin, the first portion 33-1, and the silicon support layer 32a, the silicon oxide film, and the like. And a second portion 33-2 made of the oxide layer 32b.

  The atmospheric pressure measurement cantilever 34 can be formed, for example, by processing an SOI substrate 32 in which a silicon support layer 32a, an oxide layer 32b such as a silicon oxide film, and a silicon active layer 32c are thermally bonded.

  The atmospheric pressure measurement cantilever 34 is formed of a silicon active layer 32c on the SOI substrate 2, and is formed by cutting out a gap 313 formed in a U-shape in plan view from the silicon active layer 32c on the flat plate. Here, the gap 313 (communication hole) is a gap formed between the atmospheric pressure measurement cantilever 34 and the inner wall of the sensor body 33, and allows air inside and outside the cavity 310 to flow therethrough.

Accordingly, the atmospheric pressure measurement cantilever 34 has a cantilever structure in which the base end portion 34a is a fixed end and the tip end portion 34b is a free end.
Further, the atmospheric pressure measurement cantilever 34 is disposed so as to surround the upper surface of the cavity 310 formed in the sensor main body 33. That is, the atmospheric pressure measurement cantilever 34 substantially closes the opening of the cavity 310.

  The atmospheric pressure measurement cantilever 34 is cantilevered so as to close the cavity 310 by being integrally fixed on the second portion 33-2 of the sensor body 33 via the base end portion 34 a.

  As a result, the pressure measuring cantilever 34 can be bent and deformed according to the pressure difference between the inside and the outside of the cavity 310 with the base end portion 34a as the center. Here, since the base end portion 34a of the atmospheric pressure measurement cantilever 34 is formed with a U-shaped through hole 315 in plan view, the atmospheric pressure measurement cantilever 34 is easily bent and deformed. However, the shape of the through hole 315 is not limited to the U-shape as long as it can easily be bent and deformed by the atmospheric pressure measurement cantilever 34.

  The lid 312 is disposed so as to surround the pressure measurement cantilever 34 via the gap 313 in plan view. The lid 312 is composed of a silicon active layer 32c. The lid 312 is disposed above the cavity 310.

The displacement measuring unit 35 (output unit) includes a piezoresistor 320 whose electrical resistance value changes according to the amount of deflection (displacement amount) of the atmospheric pressure measurement cantilever 34, and a detection circuit 322 that extracts this electrical resistance value change. . As shown in FIG. 2, the piezoresistors 320 are arranged in pairs on both sides of the through hole 315 in the short direction of the atmospheric pressure measurement cantilever 34.
The pair of piezoresistors 320 are electrically connected to each other via a wiring portion 321 made of a conductive material.

  The overall shape including the wiring portion 321 and the piezoresistor 320 may be, for example, a U shape in plan view. The piezoresistor 320 is electrically connected to a detection circuit 322 that measures the displacement of the atmospheric pressure measuring cantilever 34 based on a change in the electric resistance value of the piezoresistor 320.

  In the displacement measuring unit 35 configured as described above, a current generated when a predetermined voltage is applied to the piezoresistor 320 through the detection circuit 322 wraps around the through-hole 315 so that the wiring unit 321 is connected to the piezoresistor 320. To the other piezoresistor 320.

  For this reason, the detection circuit 322 can take out an electrical resistance value change of the piezoresistor 320 that changes in accordance with the displacement (deflection deformation) of the atmospheric pressure measurement cantilever 34 as an electrical output signal.

  Therefore, the displacement measuring unit 35 can measure the displacement of the atmospheric pressure measuring cantilever 34 based on the output signal (sensor output) of the detection circuit 322. Since the atmospheric pressure measurement cantilever 34 is deformed based on the differential pressure between the inside and the outside of the cavity 310, it is possible to take out the change in the atmospheric pressure outside the cavity 310 as an output signal.

  The piezoresistor 320 is formed by doping the silicon active layer 32c with a dopant (impurity) such as phosphorus by various methods such as ion implantation and diffusion.

In addition, the pair of piezoresistors 320 are configured to be electrically connected only by the wiring portion 321. For this reason, although not shown, the silicon active layer 32 c located around the atmospheric pressure measurement cantilever 34 is etched so that both the piezoresistors 320 do not conduct except at the wiring portion 321.
Further, a piezoelectric thin film may be used in place of the piezoresistor 320.

  In this case, an electromotive force is generated according to the stress applied to the base end portion 34b of the atmospheric pressure measurement cantilever 34, and the displacement of the atmospheric pressure measurement cantilever 34 can be detected by detecting this electromotive force.

(Pressure sensor operation)
Next, with reference to FIG. 4 and FIG. 5, the operation when the pressure sensor 31 described above detects a minute pressure fluctuation will be described.
FIG. 4 is a diagram schematically illustrating an example of the output of the pressure sensor 31. 4A is a diagram showing a change with time in the pressure inside and outside the cavity, and FIG. 4B is a diagram showing a change with time in the output of the pressure sensor 31. FIG.

  FIG. 5 is a cross-sectional view schematically showing an example of the operation of the pressure sensor 31. FIG. 5A shows a cross-sectional view of the pressure sensor in the initial state, and FIG. 5B shows a cross-sectional view of the pressure sensor when the pressure outside the cavity is higher than the internal pressure. C) shows a cross-sectional view of the pressure sensor when the pressure inside and outside the cavity returns to the same pressure. In FIG. 5, illustration of the detection circuit 322 constituting the pressure sensor 1 is omitted.

  First, as in period A shown in FIG. 4A, the difference between the pressure outside the cavity 310 (hereinafter “external pressure Pout”) and the pressure inside the cavity 310 (hereinafter “internal pressure Pin”) is zero. In this case, as shown in FIG. 5A, the pressure measuring cantilever 34 is not bent and deformed.

  Here, as in the period B after time t1 shown in FIG. 4A, for example, when the external pressure Pout rises stepwise, a differential pressure is generated between the outside and the inside of the cavity 310. Therefore, FIG. ), The atmospheric pressure measurement cantilever 34 is bent and deformed toward the inside of the cavity 310.

  Then, distortion occurs in the piezoresistor 320 in accordance with the bending deformation of the atmospheric pressure measuring cantilever 34, and the electric resistance value changes, so that the output signal of the pressure sensor 31 increases as shown in FIG. 4B.

  Further, in the time after the increase of the external pressure Pout, the pressure transmission medium flows from the outside to the inside of the cavity 310 through the gap 313. For this reason, as shown in FIG. 4A, the internal pressure Pin rises with a response that is slower than the external pressure Pout and more gradual than the fluctuation of the external pressure Pout as time passes.

  As a result, the internal pressure Pin gradually approaches the external pressure Pout, so that the pressure between the outside and the inside of the cavity 310 is in an equilibrium state, and the bending of the pressure measuring cantilever 34 gradually decreases, as shown in FIG. The output signal gradually decreases.

When the internal pressure Pin becomes the same as the external pressure Pout as in the period C after time t2 shown in FIG. 4A, the bending deformation of the atmospheric pressure measuring cantilever 34 is eliminated as shown in FIG. 4C. To return to the original state. Furthermore, as shown in FIG. 4B, the output signal of the pressure sensor 31 also returns to zero.
Thus, by monitoring the fluctuation of the output signal based on the displacement of the atmospheric pressure measurement cantilever 34, the pressure fluctuation outside the cavity 310 can be detected.

  In particular, since the barometric pressure measurement cantilever 34 can be formed by a semiconductor process technique using the silicon active layer 32c of the SOI substrate 32, it is easy to make it thinner (for example, several tens to several hundreds nm) than the conventional piezoelectric element. Therefore, it is possible to detect minute pressure fluctuations with high accuracy.

  However, although the above-described output signal indicates an increase or decrease in the pressure of the outside air, it does not simply indicate a time variation (pressure gradient with respect to the time axis) of the pressure of the outside air. Specifically, the output signal increasing tendency in the period B1 in FIG. 4 indicates that the actual pressure to be measured (external pressure Pout) increases, but the output signal decreasing tendency in the period B2 is as described above. This is due to the increase of the internal pressure Pin due to the flow of the pressure transmission medium from the outside to the inside of the cavity 310, and suggests that the pressure of the actual measurement object will decrease even though it has not changed over time. . For this reason, even if a simple integration process or the like is performed on the output signal, it is impossible to grasp the time change of the pressure to be measured (time change of the external pressure). Further, the maximum value of the output signal shown in FIG. 4 at the boundary between the period B1 and the period B2 roughly indicates the pressure gradient with respect to the time axis, but is not necessarily the pressure gradient value. This is because the maximum value of the output signal changes depending on the time when the pressure fluctuation occurs. On the other hand, when the pressure of the outside air increases or decreases even slightly, an output signal corresponding to the direction in which the pressure changes (increase or decrease) can be obtained.

  As described above, the pressure sensor 31 can output an output signal only when the pressure of the outside air fluctuates. Furthermore, since the cantilever is thin, it can output even a slight pressure change. Therefore, as described above, when the output signal (pressure change information) of the pressure sensor 31 indicates an increase / decrease greater than or equal to a predetermined value, the vertical movement determination unit 32 indicates that the altitude of the measurement subject has decreased / increased. Therefore, even if the measurement subject goes up and down one step of several tens of centimeters, the vertical movement can be detected from the change in atmospheric pressure.

(Control flow of arithmetic processing circuit)
Next, the flow of control processing executed by the arithmetic processing circuit 40 according to the present embodiment will be described using the flowchart of FIG.
First, when the measurement subject performs an activity corresponding to various exercise situations, exercise status information is output from the exercise status acquisition unit 20, and vertical movement information is output from the vertical movement acquisition unit 30. Then, the arithmetic processing circuit 40 acquires the exercise status information output from the exercise status acquisition unit 20 (step S101).
Next, the arithmetic processing circuit 40 determines whether or not the exercise situation of the measurement subject is walking or running based on the exercise situation information acquired in step S101 (step S102).

  The arithmetic processing circuit 40 determines that the exercise state is not walking or running in step S102, that is, if the exercise state is, for example, light work or rest, vertical movement during escalator or elevator boarding (step S102). N), the consumption energy of the basal metabolism calculated from the information such as the weight and height of the measurement subject input in advance via the input unit (not shown) is added to the energy consumption calculated so far ( Step S103). The energy consumed by the basal metabolism is the energy consumed by the body to maintain life activity regardless of the movement of the body.

  On the other hand, the arithmetic processing circuit 40 acquires an output signal (vertical movement information) from the vertical movement acquisition unit 30 when it is determined in step S102 that the exercise state is walking or running (step S102; Y) (step S102). S104).

  Next, the arithmetic processing circuit 40 determines whether there is a movement in the vertical direction of the measurement subject from the vertical movement information output from the vertical movement acquisition unit 30. Specifically, the arithmetic processing circuit 40 determines that the movement is upward when a change in atmospheric pressure (detected value of the pressure sensor 31) related to the pressure change information indicates a pressure drop equal to or greater than a predetermined value. If the pressure rise is greater than the value, it is determined to move downward (step S105). When the arithmetic processing circuit 40 determines that there is no movement in the vertical direction in step S105, that is, the surrounding atmospheric pressure change is within a predetermined value range (step S105; N), only the energy consumed for walking or running is calculated. Calculate and add to the energy consumption calculated so far (step S106). The arithmetic processing circuit 40 determines the energy consumed for walking or running based on the stride information and the time taken for one step in addition to the information on the weight, height, etc., input to the activity amount detection device 1 in advance. calculate.

  On the other hand, if the arithmetic processing circuit 40 determines that there is vertical movement (step S105; Y), it calculates the energy consumed for walking or running and the energy consumed for moving upward or downward. Then, it adds to the energy consumption calculated so far (step S107). Specifically, when the arithmetic processing circuit 40 determines that it is an upward movement and walking, the arithmetic processing circuit 40 adds an amount of about twice the consumed energy to the energy consumed for walking on a flat ground. In addition, when the arithmetic processing circuit 40 determines that the movement is downward and walking, the arithmetic processing circuit 40 adds about 0.1 times the consumption energy to the consumption energy of the flat ground walking. Therefore, the arithmetic processing circuit 40 can calculate accurate energy consumption by repeatedly executing the flow shown in FIG. 6 even when the measurement subject goes up and down one step. In addition, the arithmetic processing circuit 40 determines the direction of vertical movement from the vertical movement information obtained after synchronization or slightly delayed after determining the exercise situation, so that the atmospheric pressure not caused by the activity situation of the measurement subject himself / herself is determined. It is possible to avoid misidentifying the change as the vertical movement of the measurement subject.

  As an example, a case will be described in which the activity amount detection device 1 is attached to the upper body of the measurement subject, for example, the waist. The exercise status acquisition unit 20 determines that the impact of the measurement subject's right foot climbing a step such as a staircase and landing on the step is walking based on the detected acceleration change. At this time, since the whole body of the measurement subject moves upward, the air pressure around the activity amount detection device 1 attached to the waist decreases, and the arithmetic processing circuit 40 is based on the vertical movement information from the vertical movement acquisition unit 30. Judged to move upward.

  Next, when the measurement subject's left foot goes up one step and a landing impact occurs, similarly, it is determined as walking from the acceleration change detected by the exercise status acquisition unit 20, and the vertical movement acquisition unit 30 lowers the pressure of the waist. Is determined to be an upward movement from the vertical movement information. Therefore, the activity amount detection apparatus 1 can determine the vertical movement for each step by repeating this process. For example, when the activity amount detection device 1 is attached to the right ankle of the measurement subject, it can be determined that the right foot moves upward when the stairs rise one step, but when the left foot goes up the stairs, the next right foot landing Therefore, the determination is made every two steps. As described above, the determination of the direction of up and down movement is repeated in a short time cycle of at least several steps. Therefore, even in the control processing of the arithmetic processing circuit, it is possible to exclude the influence of a long-time pressure change such as weather fluctuation.

  As described above, according to the activity amount detection apparatus 1 of the present invention, it is possible to accurately detect an activity with a vertical direction such as one step, and to accurately calculate the energy consumption at that time. At the same time, the activity amount detection apparatus 1 can accurately calculate the energy consumption of the measurement subject without misidentifying the change in atmospheric pressure that does not result from the activity status of the measurement subject as the vertical movement of the measurement subject.

(Second embodiment)
Hereinafter, the activity amount detection apparatus 1 according to the second embodiment of the present invention will be described. Here, in the activity amount detection apparatus 1 according to the present embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The activity amount detection apparatus 1 according to the present embodiment has the same configuration as the activity amount detection apparatus according to the first embodiment. The difference between the active amount detection device 1 according to the present embodiment and the first embodiment is that not only the direction of vertical movement is specified from the output signal of the pressure sensor 31, but also the amount of vertical movement is detected and energy consumption is also detected. Is a point to calculate. That is, in the activity amount detection device 1 according to the present embodiment, the vertical movement information output from the vertical movement determination unit 32 to the arithmetic processing circuit 40 includes pressure change information (output signal of the pressure sensor) output from the pressure sensor 31. Thus, the arithmetic processing circuit 40 is configured to calculate the vertical movement amount based on the pressure change information.

  Then, according to the activity amount detection device 1 according to the present embodiment, since information such as the slope of the slope is obtained from the amount of vertical movement, for example, an activity with a large calorie consumption such as climbing a steep slope is accurately detected. And the calorie consumption in that case can be calculated more accurately.

(Control flow of arithmetic processing circuit)
Next, the flow of control processing executed by the arithmetic processing circuit 40 according to the second embodiment will be described with reference to the flowchart of FIG. Here, in this flowchart, the same processes as those in the flowchart shown in FIG. 6 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, the arithmetic processing circuit 40 calculates the vertical movement amount in step S301 based on the vertical movement information obtained from the vertical movement acquisition unit 30 in step S104.

  Next, energy consumption for walking or running is calculated, and further, energy consumption for the calculated vertical movement amount is added (step S302). Here, when the vertical movement amount is zero, that is, when walking or running on a flat ground, the added amount is zero, and the consumed energy is only for walking or running.

  Therefore, the arithmetic processing circuit 40 repeatedly executes the flow shown in FIG. 7 to increase energy consumption when climbing a steep slope and consume power when climbing a gentle slope due to the slope of the slope. Accurate energy consumption can be calculated as energy is reduced.

(Vertical movement amount / Calculation method)
Next, the procedure for calculating the vertical movement amount from the vertical movement information in step S301 in FIG. 7 will be described with reference to the flowchart of FIG.
The vertical movement information is an output signal from the pressure sensor 31 of the vertical movement acquisition unit 30. As described above, this output signal indicates the pressure around the measurement subject, that is, the fluctuation of the external pressure Pout of the pressure sensor 31. .

  First, when an output signal is input from the pressure sensor 31 of the vertical movement acquisition unit 30 (step S701), the arithmetic processing circuit 40 stores N values of the output signal of the pressure sensor 31 every fixed time Δt. (Not shown) (step S702).

  Next, the arithmetic processing circuit 40 (differential pressure calculation unit) obtains N differential pressures ΔP and N (ΔP (1 to N)) applied to the atmospheric pressure measurement cantilever corresponding to the output signal from the differential pressure database (step S703). . Here, the differential pressure database measures in advance the output signal value of the pressure sensor 31 and the value of the differential pressure ΔP applied to the atmospheric pressure measurement cantilever 34 according to the output signal value for each output signal value. The relationship specified from the measurement result is stored as a database.

  Next, the arithmetic processing circuit 40 sets an initial value to the first internal pressure Pin (1) having the earliest time among the internal pressure Pin (i) (i = 1 to N, N: a natural number of 2 or more) ( Step S704). Here, the internal pressure Pin (1) according to the present embodiment is assumed to be atmospheric pressure on the assumption that it is used in the air. Next, the arithmetic processing circuit 40 (measurement target pressure calculation unit) adds Pin (i) and the differential pressure ΔP (i) to calculate the external pressure Pout (i) (step S705; differential pressure calculation step).

  Next, the arithmetic processing circuit 40 (flow rate calculation unit) reads the flow rate Q (i) of the pressure transmission medium flowing into the cavity 10 from the flow rate database stored in the storage device using the differential pressure ΔP (i) ( Step S706). Here, the flow rate database is obtained by measuring the differential pressure ΔP and the flow rate Q corresponding to the magnitude of the differential pressure ΔP in advance for each differential pressure ΔP, and storing the relationship specified from the measurement result as a database. And

  Next, the arithmetic processing circuit 40 calculates the internal pressure Pin (i + 1) after Δt time from the flow rate Q (i) and the cavity volume V (step S707; measurement target pressure calculation step). Here, it is assumed that the fixed time Δt is very small, and the amount of change in the external pressure Pout for each Δt is very small, and the heat transfer and pressure loss are negligibly small. Therefore, the internal pressure Pin increases by the amount that the pressure transmission medium flows into the cavity 10. Therefore, the relationship among the flow rate Q (i), the volume V, the internal pressure Pin (i + 1) and the internal pressure Pin (i) can be expressed by the following equation (1).

Pin (i) × V = Pin (i + 1) × (V + Q (i) × Δt) (1)
Therefore, the arithmetic processing circuit 40 (internal pressure updating unit) can obtain Pin (i + 1) after Δt time by the following equation (2).

Pin (i + 1) = V / (V + Q (i) × Δt) × Pin (i) (2)
Next, the arithmetic processing circuit 40 stores Pin (i + 1) obtained in step S707 and Pout (i) calculated in step S705 in the storage device constituting the arithmetic processing circuit 40 (step S708; flow rate). Calculation step).

  Next, the arithmetic processing circuit 40 substitutes i + 1 for i (step S709), determines whether i exceeds N (step S710), and determines that i is N or less (step S710; N). The processes of steps S705 to S709 are repeated (repetitive processing step). At this time, the arithmetic processing circuit 40 updates the internal pressure Pin used in step S705 to Pin (i + 1) calculated in step S708 (internal pressure update step).

  If the arithmetic processing circuit 40 determines that i is larger than N (step S710; Y), the arithmetic processing circuit 40 converts the vertical movement amount from the obtained N pieces of Pout (step S711). Although several relational expressions for obtaining the altitude change amount from the atmospheric pressure change amount are known, the following relational expression (3) is known as a general one.

H = 18410.0 × log10 (Pout (i + 1) / Pout (i)) (3)
Here, H is the vertical movement amount [m], and Pout is the atmospheric pressure (absolute pressure) [Pa].

As a result, the arithmetic processing circuit 40 can obtain the vertical movement amount when the external pressure Pout (i) is changed to Pout (i + 1).
As described above, the arithmetic processing circuit 40 can accumulate N vertical movement amounts in the storage device every Δt time. This information indicates how far the measurement subject has moved in the vertical direction during the N × Δt period.

The Δt (predetermined time) may be configured so that the user can appropriately set it via a user interface unit (not shown) provided in the pressure change measuring device 1.
As described above, the arithmetic processing circuit 40 can measure the time course of the external pressure Pout and the movement amount in the vertical direction from the output signal of the pressure sensor 31.

  As described above, the arithmetic processing circuit 40 can calculate the amount of movement in the vertical direction from the output signal of the pressure sensor 31. Therefore, by combining with the acceleration information from the acceleration sensor 21 (based on the amount of movement in the plane direction), Information such as the slope is obtained. Therefore, the arithmetic processing circuit 40 can accurately detect an activity with a large calorie consumption, such as climbing a steep slope, and can calculate the calorie consumption more accurately. At the same time, the arithmetic processing circuit 40 determines the movement status and then determines the vertical movement from the vertical movement information obtained in synchronization with or slightly behind this, so that the atmospheric pressure change not caused by the activity status of the measurement subject himself / herself is detected. It is possible to accurately calculate the energy consumption of the measurement subject without misunderstanding that the measurement subject is moving up and down.

(Third embodiment)
Hereinafter, an activity amount detection apparatus 1 according to a third embodiment of the present invention will be described with reference to FIG. Here, in the activity amount detection apparatus 1 according to the present embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The activity amount detection apparatus 1 shown in FIG. 9 is different from the activity amount detection apparatus according to the first embodiment in that a biological information acquisition unit 60 is added to the activity amount detection apparatus 1. Here, the biological information acquisition unit 60 detects, for example, a pulse, a body temperature, sweating, a heat release amount, a respiratory rate, and the like as the biological information of the measurement subject.

  The biological information acquisition unit 60 includes a biological information detection sensor 61 and biological information determination means 62 and is connected to the arithmetic processing circuit 40. The biological information detection sensor 61 has, for example, a light emitting element and a light receiving element, and is a pulse sensor that detects the pulse of the measurement subject. The biological information determination unit 62 calculates biological activity information related to the activity status of the measurement subject based on a signal (biological information) output from the biological information detection sensor 61 and supplies the calculated biological activity information to the arithmetic processing circuit 40. Output. The life activity information is information such as exercise intensity (METs) and calorie consumption.

  For example, the pulse rate output from the pulse sensor is larger during walking than during resting. Similarly, there is a correlation that the pulse rate increases as the amount of physical activity increases (as the calorie consumption increases). That is, the arithmetic processing circuit 40 uses this correlation to calculate life activity information from the life information output from the life information detection sensor 61, and the calculated life activity information and a preset reference value are calculated. By comparing the magnitude relationship, it is possible to more accurately determine whether the activity state of the measurement subject is a vertically moving state or a walking or running state. It should be noted that, regardless of only the pulse, the body temperature, sweating, heat release, and respiratory rate are also correlated with the exercise intensity, calorie consumption, etc. as with the pulse, so the life activity information is calculated similarly. be able to.

(Control flow of arithmetic processing circuit)
Next, the flow of control processing executed by the arithmetic processing circuit 40 according to the third embodiment will be described using the flowchart of FIG. Here, in this flowchart, the same processes as those in the flowchart shown in FIG.

  As shown in FIG. 8, when the arithmetic processing circuit 40 determines in step S105 that the movement direction is the vertical direction (step S105; Y), the exercise status acquisition unit 20, the vertical movement acquisition unit 30, and the biological information acquisition unit 60. An output signal (life activity information) is acquired from (step S201).

  Next, the arithmetic processing circuit 40 determines whether or not the biological activity is more active based on the biological activity information acquired in Step S201 (Step S202). Specifically, the arithmetic processing circuit 40 compares the life activity information (reference value) during walking stored in advance with the life activity information acquired in step S201 to determine whether or not the activity has been activated. Determine whether. When the arithmetic processing circuit 40 determines in step S202 that the life activity has become more active (that is, it is determined that the acquired life activity information exceeds the reference value) (step S202; Y), walking or running And the energy consumption for movement in the vertical direction are calculated and added to the energy consumption calculated so far (step S107). On the other hand, if the arithmetic processing circuit 40 determines in step S202 that the life activity is not more active (that is, it is determined that the acquired life activity information is lower than the reference value) (step S202; N), the step Even if it is determined that the movement is in the vertical direction in S105, only energy consumption such as walking or running is calculated from the exercise status information and added to the energy consumption calculated so far (step S106).

  Therefore, the arithmetic processing circuit 40 can calculate accurate energy consumption even when going up and down one step by repeatedly executing the flow shown in FIG. Further, the arithmetic processing circuit 40 may be used even when a sudden change in atmospheric pressure that does not involve up and down movement occurs around the measurement subject such that the measurement subject enters and leaves the air-conditioned building (that is, the step of FIG. 8). As shown in S <b> 105, the life activity information acquired from the biological information acquisition unit 60 (even if it is determined that the movement in the vertical direction has been made only by the vertical movement amount information acquired from the vertical movement acquisition unit 30). Therefore, it is determined whether or not the biological activity is activated, so that the vertical movement of the measurement subject can be accurately identified, and the energy consumption can be accurately calculated.

(Modification)
In any one of the first to third embodiments, the activity amount detection device 1 displays the calculated energy consumption on the display device 50. However, the activity amount detection device 1 displays the display on the display device 50 or the display device 50. You may comprise so that it may transmit outside without doing.

  Specifically, for example, the activity amount detection device 1 illustrated in FIG. 11 includes a communication unit 70. The communication unit 70 is connected to the arithmetic processing circuit 40 and includes, for example, a wireless communication interface that enables transmission / reception of information to / from an external device using various wireless transmission methods. Then, the communication unit 70 receives information related to the activity status of the measurement subject such as energy consumption calculated by the arithmetic processing circuit 40. Then, the communication unit 70 transmits the input activity information such as energy consumption to the outside of the activity amount detection device 1. That is, an external device (for example, a PC or a portable electronic device) arranged outside the activity amount detection device 1 receives the activity information via the communication unit 70, thereby further analyzing the activity information. And more detailed activity information display processing can be performed. In this case, the display device 50 may display activity information such as energy consumption, and only indicates whether the device itself is operating and acquiring information or not operating. Also good.

  As described above, according to the activity amount detection device 1 according to the present modification, the device itself can be miniaturized, and at the same time, the display of the detailed activity status of the measurement subject can be shown in more detail by an external device.

  It should be noted that the technical scope of the present invention is not limited to the above-described embodiments, and includes those in which various modifications are made to the above-described embodiments without departing from the spirit of the present invention. In other words, the configuration described in the above-described embodiment is merely an example, and can be changed as appropriate. Moreover, it is also possible to employ | adopt combining each embodiment mentioned above suitably.

1 Activity detection device 20 Exercise status acquisition unit (activity state identification unit)
21 Acceleration sensor 22 Motion determination means 30 Vertical movement acquisition unit (vertical motion detection unit)
31 Pressure sensor 32 Vertical movement judging means 40 Arithmetic processing circuit (arithmetic processing unit)
DESCRIPTION OF SYMBOLS 50 Display apparatus 60 Biological information acquisition part 61 Biological information detection sensor 62 Biological information determination means 70 Communication part

Claims (8)

An activity amount detection device that is attached to a measurement subject and detects an activity amount based on the activity state of the measurement subject,
An activity state identifying unit that identifies a classification of the activity state of the measurement target person;
Vertical movement detection unit that detects the vertical movement information related to the vertical movement of the measurement subject by a pressure sensor that can be detected as a difference amount from a reference pressure that varies according to atmospheric pressure variation;
An arithmetic processing unit that calculates an activity amount according to the activity state of the measurement subject, based on the classification specified by the activity state specifying unit and the vertical movement information detected by the vertical motion detection unit, With
The pressure sensor is
A cavity having a predetermined volume;
A communication hole through which a pressure transmission medium that transmits a measurement target pressure that is a pressure around the measurement target person flows into and out of the cavity;
An output unit that outputs an output signal related to a differential pressure between an internal pressure that corresponds to the reference pressure and represents an internal pressure of the cavity, and the pressure to be measured;
The vertical movement information includes an output signal output from the output unit,
The arithmetic processing unit calculates the amount of vertical movement of the measurement subject based on the output signal,
Based on the output signal, a differential pressure calculation unit for obtaining a differential pressure between the internal pressure and the measurement target pressure;
A measurement target pressure calculation unit that calculates the measurement target pressure based on the set internal pressure and the differential pressure calculated by the differential pressure calculation unit;
A flow rate database storing the relationship between the differential pressure and the flow rate of the pressure transmission medium flowing through the cavity according to the differential pressure in a predetermined time unit;
Based on the differential pressure calculated by the differential pressure calculation unit and the flow rate database, a flow rate calculation unit that calculates a flow rate of the pressure transmission medium flowing inside and outside the cavity in a predetermined time unit;
Based on the flow rate calculated by the flow rate calculation unit and the volume of the cavity, the internal pressure after a predetermined time is calculated, and the set value of the internal pressure used by the measurement target pressure calculation unit with the calculated internal pressure An internal pressure update unit for updating
When the arithmetic processing unit determines that the activity state category is not walking or running, adds the energy consumed for basal metabolism to the activity amount, and determines that the activity state category is walking or running , Add the energy consumed for walking or running to the amount of activity, and if the activity state classification determines that the exercise status is walking or running, and if there is vertical movement, walking to the amount of activity Alternatively, the activity amount detection device characterized in that energy consumption for traveling and energy consumption for upward or downward movement are added to the activity amount. 2. The activity amount detection according to claim 1 , wherein the vertical movement information includes information related to a vertical movement direction of the measurement subject determined by the vertical movement detection unit based on an output signal of the pressure sensor. apparatus. The vertical movement detection unit determines that the measurement subject has moved downward when it is determined that the atmospheric pressure has risen to a predetermined value or more based on a value of an output signal of the pressure sensor, and the pressure sensor The activity amount detection device according to claim 2 , wherein, when it is determined that the atmospheric pressure has decreased to a predetermined value or more based on a value of an output signal, it is determined that the measurement subject has moved upward. The pressure sensor has a cantilever that is provided so as to close an opening surface of the cavity excluding the communication hole, and bends and deforms according to the differential pressure,
The output unit, activity amount detecting apparatus according to any one of claims 1 to 3, characterized in that outputs an output signal corresponding to the flexural deformation amount of said cantilever. The active, a walking state, and light work state, a running state, activity amount detecting apparatus according to claim 1-4, characterized in that it comprises a resting state, the. A biological information acquisition unit that detects biological information of the measurement subject having correlation with the activity state;
The activity amount according to any one of claims 1 to 5 , wherein the arithmetic processing unit calculates the activity amount based on the biological information in addition to the classification and the vertical movement information. Detection device. The activity amount detection apparatus according to claim 6 , wherein the biological information acquisition unit detects at least one of heart rate, body temperature, sweating amount, and respiration rate as the biological information. Activity amount detecting apparatus according to any one of claim 1 to 7, characterized in that a communication unit for the activity amount calculated by the arithmetic processing unit, and transmits to the outside of the activity amount detecting device.

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