JPH06315468A - Tension judging apparatus - Google Patents

Abstract

PURPOSE:To judge a tension of a person easily without requiring a preparation and restricting the person's action. CONSTITUTION:This apparatus provides a filter 2 to filter a specific frequency component of outputted signals of a vibration detecting means 1 set on a seat 6, a smoothing means 4 to smooth outputted signals of an amplifying means 3, and a judging means 5 to judge a tension of a person based on outputs of the smoothing means 4. With those means, a vibration state of the person touching to the vibration detecting means 1 is detected and the tension of the person's body can be judged. With no preparation and almost no restriction of the person's action, the tension can be easily judged even with no will to judge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension determination device for determining the tension of a person at a seat or the like.

[0002]

2. Description of the Related Art Conventionally, the degree of tension has been determined by, for example, measuring myoelectric potential and determining the muscle tension from the value.

[0003]

However, in the tension determination device of the above technique, it is necessary to bring the probe for measuring EMG into direct contact with the skin of the subject. There is a problem in that preparation such as attachment is required, there is a risk that the human behavior may be restricted because the human body is brought into contact with the human body, and that the determination cannot be made if there is no intention to determine the degree of tension.

A first object of the present invention is to make a determination without requiring any preparation when the apparatus for supporting a human body such as a seat or a bed is externally vibrated, and there is almost no restriction on human behavior. It is an object of the present invention to provide a tension degree determination device that can easily determine the tension degree of a human body supported by a device without any intention.

A second object of the present invention is to provide a tension degree detecting device capable of judging the degree of tension only by the vibration of the human body, even when the apparatus for supporting the human body such as a seat or a bed is not vibrated from the outside. Especially.

A third object of the present invention is to provide a tension detecting device capable of coping with differences in vibration characteristics due to vibration conditions of equipment and characteristics of people.

A fourth and fifth object of the present invention is to provide a tension degree judging device capable of accurately judging even in the presence of irregular vibrations.

[0008]

In order to achieve the first object, the present invention provides a vibration detecting means provided in a device for supporting a human body such as a seat or a bed, and an output signal of the vibration detecting means. The filter comprises a filter for filtering a specific frequency component, and a judging means for judging the tension of a person supported by the device by comparing the output signal of the filter with a predetermined reference value.

Further, in order to achieve the above second object, the vibration detecting means of the present invention comprises a film-shaped piezoelectric element.

In order to achieve the third object, the judging means of the present invention comprises a reference value setting section for setting one or a set of reference values from a plurality of values, and the reference value setting section. It comprises a judging section for judging by comparing the output of the filter with the reference value set in (4).

In order to achieve the above-mentioned fourth object, the present invention provides a first vibration detecting means provided in a device for supporting a human body such as a seat or a bed, and an output of the first vibration detecting means. A filter for filtering a specific frequency component of the signal, a second vibration detecting means provided at a location different from the first vibration detecting means of the device or its periphery, and an output signal of the filter by the second vibration detecting means. It comprises a judging means for judging the degree of tension of the person supported by the device by correcting the output using the output of the vibration detecting means and comparing it with a predetermined reference value.

In order to achieve the fifth object, the present invention provides a vibration detecting means provided in a device for supporting a human body such as a seat or a bed, and a specific output signal of the vibration detecting means. A plurality of filters for filtering the frequency components and one of the plurality of outputs of the filter is corrected by using at least one other output and is supported by the device by comparing with a predetermined reference value. It comprises a judging means for judging the degree of tension of the person.

[0013]

The present invention operates as follows with the above construction. When an external vibration is applied to a device while the human body is supported by a device that supports the human body such as a seat or a bed, the human body vibrates on the device, which causes an output to the vibration detection means provided in the device. . A certain frequency component of the generated output signal is filtered by the filter and output to the determination means, and the output of the filter is compared with a predetermined reference value by the determination means, so that the human body supported by the device is The degree of tension is determined.

Further, according to the present invention, when the human body is supported by a device supporting the human body such as a seat or a bed, the film-shaped piezoelectric element provided in the device is deformed by the body motion of the human body, and the piezoelectric Voltage is generated by the effect. A certain frequency component of the generated voltage signal is filtered by the filter, and the output of the filter is compared with a predetermined reference value by the determination means to determine the degree of tension of the human body supported by the device. .

Further, according to the present invention, when vibration is applied to the equipment from the outside while the human body is supported by the equipment supporting the human body such as a seat or a bed, the human body vibrates on the equipment, which causes the equipment to move. An output is generated in the vibration detecting means provided. A specific frequency component of the generated output signal is filtered by the filter and output to the determination means. The determination means determines the degree of tension of the human body supported by the device by comparing the output of the filter with one or a set of reference values set from the plurality of values by the reference value setting unit.

Further, according to the present invention, when vibration is applied to the equipment from the outside while the human body is supported by the equipment supporting the human body such as a seat or a bed, the human body vibrates on the equipment, which causes the equipment to move. An output is generated in the provided first vibration detecting means. A specific frequency component of the generated output signal is filtered by the filter and output to the determination means. On the other hand, a signal due to vibration other than the vibration component of the human body is output to the determination means by the second vibration detection means provided at a place different from the first vibration detection means in the device or its periphery, and the output of the filter is output by the determination means. The tension of the human body supported by the device is determined by being corrected using the output of the second vibration detection means and then compared with a predetermined reference value.

Further, according to the present invention, when the external vibration is applied to the equipment while the human body is supported by the equipment such as the seat or the bed, the human body vibrates on the equipment, and the vibration provided on the equipment An output is generated in the detection means. The generated output signal is filtered by a plurality of filters each filtering a specific frequency component, filtered into a plurality of signals corresponding to the respective frequency components, and output to the determination means. The determination means determines one of the plurality of outputs of the filter using at least one other output and compares the output with a predetermined reference value to determine the tension of the person supported by the device.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of this embodiment. Here, the case where it is installed in a seat of an automobile as a device for supporting a human body is shown. In FIG. 1, 1 is a vibration detecting means, 2 is a filter, and 5 is a judging means. The vibration detecting means 1 is a piezoelectric acceleration sensor. When a vibration acceleration is applied, a ball in the sensor is accelerated, and a chip-shaped piezoelectric body arranged in contact with the ball is deformed to generate a voltage. It is possible to obtain a voltage according to the acceleration received by the sensor. The vibration detecting means 1 is provided below the surface cloth of the contact surface 7 of the seat 6 with the human body so that the human body can easily receive the vibration. In this embodiment, since the signal obtained from the vibration detecting means 1 is weak, the output of the filter 2 is amplified by the amplifying means 3, the unnecessary fluctuation component is removed by the smoothing means 4, and the result is output to the judging means 5.

The operation of the structure of the first embodiment will be described below. When the human body is seated on the seat 6 and the seat 6 is vibrated by the vibration of the engine at the time of idling, the human body vibrates on the seat 6 and vibrates under the surface cloth of the contact surface 7 of the seat 6 with the human body. A voltage is generated from the detection means 1 by the acceleration of vibration of the human body. Since the voltage generated at this time fluctuates in synchronization with the vibration state of the person, it is possible to know the vibration state of the person by examining the fluctuation of the voltage. In general, it is known that human vibration has different frequency characteristics in a tense state and a relaxed state. An example of the result of examining the frequency characteristic of human body vibration in the tense state and the relaxed state is shown in FIG. Indicates. Here, f1 is considered to be the natural frequency when the human body is vibrated, and f1 is greater than that when the human body is in a relaxed state as shown in the figure as compared with the case where the human body is tense.
Therefore, if the vibration applied to the seat from the outside is constant, it is possible to detect the tension of the human body by examining the vibration state of the person and the signal level of the frequency component of f1. Here, the vibration when the vehicle is idling is applied to the seat, but since this vibration is almost constant, the tension determination device of this embodiment can determine the tension. The voltage signal generated from the vibration detecting means 1 is filtered by the filter 2 to output only the frequency f1 component and is output. However, since the voltage generated from the vibration detecting means 1 is weak, it is amplified by the amplifying means 3, and further,
Smoothing means 4 smoothes and removes unnecessary fluctuation components. Then, the determination means 5 compares the output of the smoothing means 4 with a predetermined reference value to determine the tension state of the human body. FIG. 3 shows the level of tension determined. In the present embodiment, the degree of tension is set to 3 as follows by the reference values Va and Vb based on the magnitude of the output signal V1 of the smoothing means 4.
Judgments are made according to types.

When V1 <Va, the person is considerably nervous. When Va <V1 <Vb, the person is moderately nervous. When V1> Vb, the person is relaxed. Although the vibration is detected, the degree of tension can be determined by the method according to the present embodiment when the road surface condition is always constant even during traveling.

Thus, in this embodiment, the vibration detecting means 1
Is installed in the seat 6 in advance, and the degree of tension of the human body on the seat is determined by checking the vibration state of the human body that vibrates on the seat due to the vibration of the vehicle such as idling. There is no need to prepare a sensor, and since it is not necessary to attach a sensor to the human body, the behavior of the person is hardly restricted, and the degree of tension can be easily judged even if the person has no intention to judge. It has become.

With the above operation, the degree of tension of the human body is judged by examining the vibration of the human body by the vibration detecting means provided in the seat, so preparation for the judgment is unnecessary and the human behavior is hardly restricted. There is an effect that the degree of tension of the human body can be easily determined without the determination intention.

Next, a second embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 4 is a block diagram of this embodiment. In FIG. 4, this embodiment is different from the first embodiment in that the vibration detection means provided under the surface cloth of the contact surface of the seat 6 with the human body is a film-shaped piezoelectric element 8.

The operation of the second embodiment will be described. First
In the above embodiment, a piezoelectric acceleration sensor using a chip-shaped piezoelectric body is used as the vibration detecting means 1. However, in this case, since the acceleration due to one point of vibration is detected, it is effective only when a large vibration is obtained to some extent. Therefore, when vibration is not applied from the outside, the human body hardly vibrates, which makes it difficult to determine the degree of tension. Therefore, the tension determination device of this embodiment uses the film-shaped piezoelectric element 8 as the vibration detection means. Figure 5
A structural diagram of the film-shaped piezoelectric element 8 is shown in FIG. The film-shaped piezoelectric element 8 is formed by forming a flexible electrode film 10 on both surfaces of a piezoelectric material 9, which is a thin film of a polymeric piezoelectric material such as polyvinylidene fluoride (PVDF), and is formed into a tape shape. When a human body is seated on the seat 6, the film-shaped piezoelectric element provided under the surface cloth of the contact surface of the seat 6 with the human body is deformed by the body motion of the human body, and a voltage is generated by the piezoelectric effect. When the film-shaped piezoelectric element 8 is used, the vibration of the human body can be directly transmitted to the piezoelectric body, and the vibration of the human body can be detected by using the entire contact surface 7 between the device and the human body. The contact surface 7 with the human body can be deformed according to the shape of the human body to be in close contact with the human body, and even if the shape of the contact surface of the human body with the device changes due to the vibration of the human body, the contact can be maintained by following the change. Therefore, it has the advantage of being able to detect vibrations of the human body with extremely high sensitivity, and it is possible to detect vibrations due to minute body movements of the body propagated by heart activity and respiratory activity when the human body is at rest. Is. FIG. 6 shows a signal obtained from the human body on the seat when the engine of the automobile is stopped and no vibration is applied to the seat 6 from the outside.
FIG. 6B is an output waveform diagram of the smoothing means of the tension detecting means of the present embodiment. The fluctuation of the signal is synchronized with the activity of the heart,
It can be seen that the vibration of the human body due to the heartbeat is detected. That is, since it is possible to detect a minute vibration of the human body due to a vibration source inside the human body such as a heartbeat, if the tension state is determined using this vibration, even if the device supporting the human body cannot be vibrated from the outside, You can judge the tension of the supported person.

With the above operation, by using the film-shaped piezoelectric element 8 as the vibration detecting means, it is possible to detect the minute vibration of the human body due to the vibration generated from the human body and to judge the degree of tension, so that the human body is supported. Even when vibration is not applied to the device from the outside, the degree of tension of the human body supported by the device can be determined.

Next, a third embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 7 is a block diagram of this embodiment. In FIG. 7, the present embodiment is different from the first embodiment in that the determination means 5 has one or a plurality of values.
It comprises a reference value setting unit 12 that sets a set of reference values, and a determination unit 13 that compares and determines the reference value set by the reference value setting unit 12 and the output of the filter 3.

The third embodiment 2 will be described. In the tension determination device of the first embodiment, the reference value used for the determination by the determination means 5 is predetermined, so when the vibration applied from the outside or the condition of the human body that receives it changes, the vibration state of the human body. However, there is a problem in that it becomes difficult to make an accurate determination because In order to solve this problem, in this embodiment, as shown in FIG. 7, the determination means 5 is provided with a reference value setting unit 12 that can set one or a set of reference values from a plurality of reference values. Here, the term “one set” means that in the first embodiment, the degree of tension is determined to be three states, and therefore, two conditions are set.
One standard value is required. Therefore, when the conditions change, the two reference values are changed, which is expressed as one set. In the present embodiment, by providing the reference value setting unit, even if the vibration conditions applied from the outside and the human body conditions such as age, sex, and weight change, it is possible to obtain an appropriate reference value under those conditions. For example, since the appropriate reference value can be set by the reference value setting unit 12 each time, the degree of tension can be accurately determined under various conditions.

A plurality of reference values that can be set by the reference value setting unit 12 may be stored in the storage means.

When there are a plurality of reference values to be set, a plurality of reference value setting means may be provided depending on the number of required reference values.

With the above operation, the reference value setting unit 12 capable of setting one or a set of reference values from the plurality of reference values in the determination means 5, and the signal from the vibration detection means 1 input to the determination means 5. By providing the determination unit 13 that compares the reference value set by the reference value setting unit 12 with the reference value set by the reference value setting unit 12 to determine the degree of tension of the human body supported by the device, even if externally applied vibration or the human body condition changes, Since an appropriate reference value can be set and determined each time, there is an effect that the degree of tension can be determined accurately under various conditions.

Next, a fourth embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 8 is a block diagram of this embodiment. In FIG. 8, the present embodiment is different from the first embodiment in that, in addition to the first vibration detecting means 14 provided under the surface cloth of the contact surface 7 of the seat 6 with the human body, the first Filter 1 for filtering a specific frequency component of its output signal, having a second vibration detecting means 15 installed at a place different from the vibration detecting means 14 of FIG.
6 and amplification means 17 for amplifying the output of the filter 16.
And a smoothing means 18 for smoothing the output of the amplifying means 17.

The operation of the structure of the fourth embodiment will be described below. Here, the case where it is installed in a car seat is shown. In this case, it is found that the vibration of the human body is not constant and the tension cannot be accurately determined in some cases because the vibration of the human body is not constant in this case.
In order to solve this problem, in the present embodiment, in addition to the first vibration detecting means 14 disposed under the surface cloth of the contact surface 7 of the seat 6 with the human body, the first vibration detecting means 14 of the device is used. 2nd installed in a place that is different from and not affected by human vibration
The vibration detecting means 15 of FIG.

FIG. 8A shows the first example when the automobile is running.
The output of the smoothing means 4 of the vibration detecting means 14 is shown. Here, it shows a moderately tense state. Here, the filter 2 is a filter for filtering the frequency f1 corresponding to the natural frequency of the human body, and as shown in the first embodiment, the output of the output is amplified and smoothed. Can be determined. However, in the method according to the first embodiment,
In (a), it is possible to make a correct determination when traveling on a paved road, but when traveling on a bad road, the vibration of the entire vehicle is large, so even if the vehicle is moderately tense, the vibration level is large. It is erroneously determined to be in a relaxed state. Therefore, in the present embodiment, as shown in FIG. 8, the vibration detecting means 15 is installed in a place where the influence of the vibration of the human body is small, and the output of the vibration detecting means 15 is used to correct the output of the first vibration detecting means 14 for the automobile. Eliminates the effects of irregular vibrations caused by running. In the present embodiment, the output of the second vibration detecting means 15 is filtered by the filter 16 which filters the frequency component of f1, amplified by the amplifying means 17, and further smoothed by the smoothing means 18 for determination. It is output to the means 5. An output obtained by filtering the signal detected by the second vibration detecting means 15 by the filter 16, amplifying by the amplifying means 17, and smoothing by the smoothing means 18 is shown in (b). Further, (c) shows the result of correction using the output of (b). The correction value R1 shown in (c) is expressed by equation (1), where V1 is the output of the smoothing means 4 of the first vibration detecting means 14 and V2 is the output of the smoothing means 18 of the vibration detecting means 15.

R1 = V1 / V2 (1) In the present embodiment, the degree of tension is classified into the following three types based on the magnitude of the correction value R1 and the reference values Ra1 and Rb1.

When R1 <Ra1 I am quite nervous When Ra1 <R1 <Rb1 I am moderately nervous When R1> Rb1 I am relaxed In FIG. In (c), it can be seen that the erroneous determination is eliminated by the correction.

The first vibration detecting means used in this embodiment may be a film-shaped piezoelectric element.

Further, the second vibration detecting means of this embodiment is
If the vibration applied to the device can be detected, it is not always necessary to provide the device.

Due to the above operation, in this embodiment, in addition to the first vibration detecting means for detecting the vibration of the human body, a place different from the first vibration detecting means in the equipment or its periphery and less affected by the vibration of the human body By providing the second vibration detection device installed in the vehicle, it is possible to reduce the influence of irregular vibration due to traveling of the automobile and the like, and thus it is possible to provide a tension level detection device with few erroneous determinations.

Next, a fifth embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 10 is a block diagram of this embodiment. In FIG. 10, the present embodiment is different from the first embodiment in that there are a plurality of filters 2 for filtering the output of the vibration detecting means 1 provided in the seat 6, and they respectively filter different frequency components. The filtered signals are respectively amplified by the plurality of amplifying means 3, smoothed by the plurality of smoothing means 4 and output to the determining means 5, and the human body is output by the plurality of output signals of the plurality of smoothing means 4. The point is to detect the degree of tension. In this embodiment, the case where there are two filters is shown.

The operation of the structure of the fifth embodiment will be described below. The case of a car seat as the equipment to be installed is shown. As described in the fourth embodiment, since the vibration of the vehicle is affected by the irregular vibration, the vibration of the human body may not be constant and the tension may not be accurately determined in some cases. In order to solve the problem, in the present embodiment, a plurality of filters 2a for filtering certain specific frequency components of the output of the vibration detecting means 1 arranged under the surface cloth of the contact surface 7 with the human body of the seat 6 are provided. , 2b.

FIG. 11 (a) shows the output of the smoothing means 4a of the vibration detecting means 1 when the automobile is running. Here, it shows a moderately tense state. Filter 2 here
Reference numeral a is a filter for filtering the frequency f1 corresponding to the natural frequency of the human body, and the tension of the human body can be determined from the magnitude of the signal obtained by amplifying and smoothing this output as shown in the first embodiment. . However, in the method according to the first embodiment of the present invention, as shown in (a), it is possible to make a correct determination when traveling on a paved road, but when traveling on a rough road, vibration of the entire vehicle Therefore, it is erroneously determined that the vibration level is high and the state is relaxed even when the user is in a moderately tense state. Therefore, in this embodiment,
As shown in FIG. 10, in addition to the filter 2a for filtering the frequency component of f1, at least one filter 2b for filtering the frequency component other than f1 is provided, and its output is used to f
By correcting the signal component of 1, the influence of irregular vibration due to running of the automobile is eliminated. When a car runs, the car body vibrates due to road surface irregularities and engine vibrations, and the vibrations have a natural frequency determined by the rigidity of the suspension and tires. The natural frequency of the vehicle body is often designed to have a frequency different from the natural frequency f1 of the human body in consideration of the riding comfort of the vehicle, and the magnitude of vibration of the frequency component of the natural frequency of the vehicle body. It becomes possible to extract the signal of the vibration component of the vehicle body having almost no vibration component of the human body even from the output of the vibration detecting means for examining the vibration of the human body. In order to extract this vibration component, the output signal of the vibration detection means 1 is filtered by the filter 2b which filters the frequency component of the natural frequency of the vehicle body, and amplified by the amplification means 20b.
Further, it is smoothed by the smoothing means 21b. The output signal of the smoothing means 4b is shown in (b). In addition, (c) shows a result corrected using the output of (b). The signal R2 shown in (c) is expressed by equation (2), where the output of the smoothing means 4a for the f1 component is V1, and the output of the smoothing means 4b for signal components other than f1 is V3.

R2 = V1 / V3 (2) In the present embodiment, based on the magnitude of the correction value R2, the tension is divided into the following three types for determination based on the reference values Ra2 and Rb2.

When R2 <Ra2, I am very nervous When Ra2 <R2 <Rb2 I am moderately nervous When R2> Rb2 I am relaxed In FIG. It can be seen that in (c), the erroneous determination is eliminated by the correction.

The vibration detecting means used in this embodiment may be a film-shaped piezoelectric element. With the above operation, in the present embodiment, the output signal of the vibration detection means provided in the seat is
By detecting the degree of tension of a person using multiple outputs obtained by filtering with a plurality of filters that each filter a certain specific frequency component, the effects of irregular vibrations due to running of a car can be reduced. As a result, it is possible to provide a tension degree detection device with few erroneous determinations.

In the first, second, third and fifth embodiments described above, the vibration detecting means is provided in the seat, but it may be installed in a bed or bedding such as a futon or other support for a human body. Good. Further, it may be configured to be built into clothes or a belt and be worn on the human body.

Further, in the fourth embodiment, the first vibration detecting means is provided on the seat, but it may be installed on a bed such as a bed or a futon or other support for a human body. Further, it may be configured to be built into clothes or a belt and be worn on the human body.

As described above, according to the tension determination device of the present invention, the tension of the human body supported by the device supporting the human body can be determined. This can be applied to, for example, ensuring the safety of the driver of the automobile and work management of the seated worker.

[0048]

As described above, according to the tension detecting device of the present invention, the following effects can be obtained.

That is, when vibration is applied to the equipment from the outside while the human body is supported by the equipment such as seat or bed, the human body vibrates on the equipment, and the vibration of the human body is detected by the vibration detecting means provided in the equipment. Since the tension of the human body can be determined by investigating with, the preparation for the determination is not required, the behavior of the human body is hardly limited, and the tension of the human body can be easily determined without the intention of the determination. it can.

Further, by using a film-shaped piezoelectric element as the vibration detecting means, the degree of tension can be judged by detecting the weak vibration of the human body generated by the heart or respiratory activity, so that the vibration from the outside cannot be applied. But you can judge the tension.

In addition, the judging means uses one of a plurality of reference values.
A reference value setting means for setting one or a set of reference values,
The vibration applied from the outside is provided by providing a determination unit that compares the signal from the vibration detection unit input to the determination unit with the reference value set by the reference value setting unit to determine the tension of the human body supported by the device. Even if the condition of the human body or the condition of the human body changes, an appropriate reference value can be set each time, so that the tension can be accurately determined even if externally applied vibration or the condition of the human body changes.

Further, in addition to the first vibration detecting means provided in the equipment supporting the human body such as the seat and the bed, the second vibration detecting means is provided at a place different from the first vibration detecting means in the equipment or in the vicinity thereof. Since the influence of the change of the vibration can be reduced even when the vibration applied from the outside is irregular, the tension detecting device with less erroneous judgment can be provided by determining the tension of the human body using these two outputs. Can be provided.

Further, a plurality of filters obtained by filtering the output signal of the vibration detecting means provided in a device supporting a human body such as a seat or a bed by a plurality of filters for filtering certain specific frequency components respectively. By detecting the tension of a person using the output, the influence of the change in the vibration can be reduced even when the vibration applied from the outside is irregular, so that there is an effect that it is possible to provide a tension detection device with few erroneous determinations. .

[Brief description of drawings]

FIG. 1 is a block diagram of a tension determination device according to a first embodiment of the present invention.

[Fig. 2] Frequency characteristic diagram showing the difference in vibration characteristics of the human body when relaxed and when nervous.

FIG. 3 is a determination diagram of a tension level determination device according to the first embodiment of the present invention.

FIG. 4 is a block diagram of a tension degree determination device according to a second embodiment of the present invention.

FIG. 5 is a structural diagram of a film-shaped piezoelectric element of the device.

FIG. 6A is an electrocardiogram of a person sitting on a device. FIG. 6B is an output diagram of an amplifying unit of the tension degree determination device according to the second embodiment of the present invention.

FIG. 7 is a block diagram of a tension determination device according to a third embodiment of the present invention.

FIG. 8 is a block diagram of a tension determination device according to a fourth embodiment of the present invention.

FIG. 9 (a) is an output diagram of an amplifying means according to a signal of a first vibration detecting means of the same device, and (b) is an output diagram of an amplifying means according to a signal of a second vibration detecting means of the same device. Waveform diagram of correction values by multiple input signals of the judging means

FIG. 10 is a block diagram of a tension determination device according to a fifth embodiment of the present invention.

FIG. 11 (a) is an output diagram of the amplifying means by the output signal of the filter for filtering the f1 frequency component of the device, and (b) is an output diagram of the amplifying means by the output signal of the filter for filtering the frequency component other than f1 of the device. Output diagram (c) Waveform diagram of correction values by a plurality of input signals of the determination means of the same device

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 vibration detecting means 2 filter 5 judging means 6 seat 12 reference value setting section 13 judging section 14 first vibration detecting means 15 second vibration detecting means 16 filter of second vibration detecting means 17 second vibration detecting means Amplifying unit 18 Smoothing unit of second vibration detecting unit

Claims (5)

[Claims] 1. A vibration detecting means provided in a device supporting a human body such as a seat or a bed, a filter for filtering a specific frequency component of an output signal of the vibration detecting means, and an output signal of the filter. A tension degree determination device comprising a determination means for determining the tension degree of a person supported by the device by comparing with a predetermined reference value. 2. The tension determining device according to claim 1, wherein the vibration detecting means comprises a film-shaped piezoelectric element. 3. The determination means compares a reference value setting unit for setting one or a set of reference values from a plurality of values with the reference value set by the reference value setting unit and the output of the filter. The tension level determination device according to claim 1, further comprising a determination unit that determines the tension level. 4. A first vibration detecting means provided in a device for supporting a human body such as a seat or a bed, and a filter for filtering a specific frequency component of an output signal of the first vibration detecting means, Second vibration detecting means provided in a place different from the first vibration detecting means of the device or its periphery,
Tension degree comprising a determination means for determining the tension of the person supported by the device by correcting the output signal of the filter using the output of the second vibration detection means and comparing it with a predetermined reference value. Judgment device. 5. A vibration detecting means provided in a device for supporting a human body such as a seat or a bed, a plurality of filters for filtering certain specific frequency components of an output signal of the vibration detecting means, and a filter for the filter. Tension comprising determination means for determining the degree of tension of a person supported by the device by correcting one output of the plurality of outputs using at least one other output and comparing it with a predetermined reference value. Degree determination device.