JP2985645B2 - Human body detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a human body detecting device for detecting the presence or absence of a person on a seat or a bed.

[0002]

An example of a conventional human body detection device shown in FIG 1. Here, a case where the camera is installed on a seat is shown. seat
Piezoelectric element 1 for detecting body movement of a person arranged on seat surface 11
When a filter 7 for filtering only the frequency components that are out of the output from the piezoelectric element 1, and the signal amplifying means 8 for amplifying an output signal from the filter 7, the smoothing for smoothing an output signal from the signal amplifying means 8 Means 9 and determining means 10 for determining the presence or absence of a person on the seat based on the output signal of smoothing means 9
Was composed of

When the human body sits on the seat 11, the piezoelectric element 1 disposed under the surface cloth of the seat 11 is deformed by the body movement of the human body, and a voltage is generated by a piezoelectric effect. A specific frequency component of the generated voltage signal is filtered by the filter 7, amplified by the signal amplifier 8, and smoothed by the smoother 9. 1 2 shows an output signal waveform of the smoothing means 9 during the seating. Seating than 1 2, limb movement, the piezoelectric element 1 because in the case of rough body movement such unseating is operating throughout the body is a large signal waveform emitted from the smoothing means 9 receiving large deformation, a seated occupant relatively level low output such as S portion of FIG. 1 2 comes out by small body movement of the body propagated by which the human body cardiac activity and respiratory activity while maintaining the can resting. Also, when placed in the seat of the objects as shown in FIG. 1 2, immediately after placing but large output is out,
It objects on does not output such as the S portion of FIG. 1 2 Since activities and respiratory activity is not the heart as described above. By using such a signal difference between a person and an object, the person and the object are distinguished.

[0004]

[SUMMARY OF THE INVENTION] However name husk, the human body detection device of the above technique <br/> procedure detects a relatively level low output signal state human on the device is kept resting When the presence or absence of a person is determined, the vibration of the human body at this time is very weak, and the output signal of the piezoelectric element is a very weak signal on the order of several mv. It is necessary to set a very large value, and there are problems that the circuit becomes complicated and that the circuit is easily affected by noise.

A first object of the present invention is to provide a human body detecting device capable of detecting a human body motion in a resting state with a small amplification factor.

A second object of the present invention is to provide a human body detecting apparatus which can detect a motion of a human in a resting state with a small amplification factor and does not make the human body feel pressure.

[0007]

In order to achieve the above object, a human body detecting apparatus according to the present invention comprises a vibration input section which receives physical vibration, and a deformation receiving section which receives deformation by the applied vibration.
A piezoelectric element that generates an output signal in accordance with the amount , and the vibration input to the vibration input unit causes a large deformation amount of the piezoelectric element.
From deformation amount amplification unit to be applied to the piezoelectric element Kunar so
Becomes, the piezoelectric element is disposed between the deformation amount amplification unit and the vibration input unit, and a configuration in which the deformation amount amplification unit is provided with at least one protrusion on a surface of the piezoelectric element <br/> side age
The vibration input unit is in contact with the human body.
On the surface, and based on the output signal of the piezoelectric element,
A determination means for determining nothing is provided .

A vibration input unit for receiving a physical vibration
And undergoes deformation due to the applied vibration, depending on the amount of deformation.
And a piezoelectric element for generating an output signal through the vibration input section.
The applied vibration is applied so that the amount of deformation of the piezoelectric element is increased.
And a deformation amplifying means to be added to the piezoelectric element.
And between quantity amplifying means between the vibration input portion and the piezoelectric element, it is arranged in the vibration input portion of the piezoelectric element <br/> and opposite, respectively deformation amount increase
The vibration input unit is configured such that at least one projection is provided on the surface of the width unit on the piezoelectric element side , and the vibration input unit is
It is arranged on the contact surface with the human body, and the output signal of the piezoelectric element
A determination means for determining the presence or absence of a person based on the determination is provided .

[0009]

The present invention operates as follows by the above configuration. If the human body touches the contact surface with the human body such as a seat or bed,
When pressure is applied by the body, vibration is applied to the contact surface with the human body.
Vibration detection from the vibration input section located on the contact surface with the human body
Vibration is input to the output device. The input vibration is piezoelectric
It is transmitted to the element and further transmitted to the deformation amount amplifying means.
The deformation amount amplifying means is a piezoelectric element that is vibrated by at least one protrusion provided on the surface of the deformation amount amplifying means on the piezoelectric element side.
Further applied to the piezoelectric element <br/> and amplified as deformation of the element is increased, an output signal corresponding to the amount of deformation is the piezoelectric element the amplification occurs, the vibration is detected. And like this
Seat or bed by the judgment means based on the output signal generated in
The presence or absence of a person on the top is determined.

In addition, the human body is in contact with a human body such as a seat or a bed.
When contact with the contact surface and pressure from the human body is applied, contact with the human body
Vibration is applied to the surface and vibration input placed on the contact surface with the human body
Vibration is input from the force unit to the vibration detection device. Entered
Vibration is first applied to the vibration input section and the piezoelectric element
1 is added to the deformation amount amplifying means. First deformation amount amplification hand
The vibration applied to the step is caused by the piezoelectric element of the first deformation amplifying means.
Pressure by at least one projection provided on the surface on the
Amplify so that the amount of deformation of the piezoelectric element increases
The vibration applied to the piezoelectric element is
Second deformation amplifying hand located on the opposite side of the vibration input section
At least one protrusion provided on the surface of the step on the piezoelectric element side;
Part to increase the amount of deformation of the piezoelectric element.
Is added to the piezoelectric element and the piezoelectric element
Generates an output signal corresponding to the amount of deformation, and detects vibration.
You. Then, it is determined based on the output signal thus generated.
The presence or absence of a person on a seat or bed is determined by means
Is done.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 1 is a structural view of a vibration detecting device of the present embodiment. FIG. 1A shows a state in which the deformation amplifying means does not press the piezoelectric element the most due to the vibration of the object 6 , and FIG. 1B shows a state in which the deformation amplifying means presses the piezoelectric element the most due to the vibration of the object 6 . In Figure 1, 1 is a piezoelectric element, 2 a variation
The shape amount amplifying means 3 is a vibration input unit. 4 is piezoelectric
Cable 5 for transmitting the output of element 1 to an external circuit
The external force from parts other than the dynamic input unit 3 is applied to the piezoelectric element 1 and the deformation amplification unit
3 is a cover for preventing transmission to 3. here,
The piezoelectric element 1 is a flexible piezoelectric element formed of a polymer piezoelectric material such as polyvinylidene fluoride (PVDF) in the form of a thin film, and having flexible electrode films adhered to both surfaces thereof and formed into a tape shape. Generates an output voltage proportional to the time derivative of The deformation amplifying means 2 is made of a plate-like synthetic resin and is made of piezoelectric material.
A plurality of protrusions 13 are formed on the surface on the element 1 side. The surface of the vibration input section 3 on the side of the deformation amplifying means 2 is made of a material such as urethane which is deformed by pressure.

[0012] will be described below the action by the configuration of the above-mentioned reference example. When the vibrating object 6 comes into contact with the vibration input unit 3 and the vibration is transmitted, the vibration is transmitted to the deformation amplification unit 2 via the piezoelectric element 1. As a result, when the deformation amplifying means 2 vibrates, the vibration is transmitted to the piezoelectric element 1 via the protrusion 13 formed on the surface of the deformation amplifying means 2 on the piezoelectric element 1 side. Here, if the weight of the deformation amount amplification unit 2 is small enough than the weight of the object 6, a deformation amount amplification unit 2 is vibrated by the vibration of the object, the surface of the deformation amount amplification unit side of the vibration input unit 3 such as urethane since the is composed of deformable material by pressure deformation amount amplification unit 2 becomes different vibration vibration and the phase of the object 6, and object 6 to vibrate deformation amount amplification unit 2
The piezoelectric element 1 installed between them is pressed alternately by both the object 6 and the deformation amount amplifying means 2. Here, the amount of deformation <br/> amplifying means piezoelectric element 1 side piezoelectric element 1 when provided with the projections 13 on the front surface of the 2, 1 most piezoelectric element deformation amount amplification unit 2 shown in (a) 1 in a state where no pressure on, but not deformed regardless of the convex portion 13, FIG. 1 in the state where the deformation amount amplification unit 2 the most pressure on the piezoelectric element 1 shown in (b), the deformation amount amplification unit 2 the projection 13 in the piezoelectric element 1, the deformation amount amplification unit 2
The piezoelectric element 1 is subjected to large deformation because it is pressed into the vibration input unit 3 which receives the pressure of the vibration intensively and is easily deformed by the pressure . On the other hand, in the portion having no convex portion, the piezoelectric element 1 is not completely deformed because it is not completely in contact with the deformation amplification means 2. Therefore, the vibration of the piezoelectric element 1 is a vibration having the maximum swing width in the projection 13. At this time, the piezoelectric element
Since the child 1 is intensively deformed by the convex portion 13 , the swing width becomes larger than that without the convex portion, and a large voltage can be taken out from the piezoelectric element 1. Further divided, when the deformation amount increase <br/> width means 2 of the piezoelectric element 1 side of the front surface of the projection 13 provide a plurality, vibration of the piezoelectric element 1 into a plurality of small vibration having the maximum swing width protrusions 13 The more the protrusions 13 are, the more the piezoelectric element
Increase the total deformation amount of the child 1, can further increase the voltage generated from the piezoelectric element 1. Therefore, the protrusion 13
Thus, the magnitude of the output signal of the piezoelectric element 1 can be controlled, and a larger voltage can be generated than when there is no protrusion.

[0013] The above-described action, the piezoelectric element vibration of the object 6
In addition to the piezoelectric element 1 is amplified as deformation amount of 1 increases, the generating an output signal corresponding to the amplified deformation amount, to provide easily detectable vibration detecting apparatus even small vibrations it can.

Incidentally, the abovereferenceIn the example,Deformation amountAmplification means2
IsPiezoelectric element 1Vibrating object6And provided on the opposite side
But with a vibrating objectPiezoelectric element 1May be installed between
No. At this time,Piezoelectric element 1Object6And ureta on the other side
Provide a sheet of material that can be easily deformed by the pressure of
And even better. Also,Piezoelectric element 1Multiple on both sidesDeformation amount
Amplifying means may be provided.

Next, a first embodiment of the present invention will be described with reference to the accompanying drawings. This embodiment shows a human body detection device. FIG. 2 is a block diagram of the present embodiment. Here, a case where the device is installed on the seat 11 is shown. In FIG. 2, 1 is a pressure.
The element 2 is a deformation amplifying means, and 10 is a judging means.
Here, the output signal of the deformation amount amplifying means 2 is filtered to a signal of a specific frequency by the filter 7, amplified by the signal amplifying means 8, smoothed by the smoothing means 9, and sent to the determining means 10. Sent. The piezoelectric element 1 is a flexible piezoelectric element formed of a polymer piezoelectric material such as polyvinylidene fluoride (PVDF) in the form of a thin film, and having flexible electrode films adhered to both surfaces thereof, and formed into a tape shape. 11
Are arranged under the outer cloth 14 . FIG. 3 is a cross-sectional view of the inside of the seat , and FIG. 4 is an enlarged view of the seat cross section when the seated human body is at rest . In the figure, reference numeral 12 denotes urethane forming a seat cushion.
14 is a table cloth, 15 is a seat frame.
You. The deformation amplifying means 2 is made of synthetic resin and is made of a piezoelectric element as shown in the figure.
A convex portion 13 is formed in a portion facing the child 1.

The operation of the above embodiment will be described below. When the human body 16 is seated on the seat 11, the surface cloth of the seat 11
14 piezoelectric element 1 installed under the the pressure of the body 16
It is pressed against the deformation amplifying means 2 to be deformed, and a voltage is generated by the piezoelectric effect. The fine body movement of the body seated occupant 16 is propagated by the activities and respiration activity of the heart of the human body 16 is kept resting piezoelectric element 1 is oscillating with small signal is generated. Voltage generated from the piezoelectric element 1 by the piezoelectric effect generates a large voltage larger the deformation amount, but here, when the human body 16 sitting, the piezoelectric element 1
Is pressed against the convex portion 13 of the deformation amplifying means 2,
Deformation according to the state of the protrusion 13 can generate a larger signal than when no protrusion 13 is provided.
On the other hand, in the at rest, as shown in FIG. 4, since the protrusions 13 of the deformation amount amplification unit 2 the pressure due to the human body 16 centrally receive but does not move the piezoelectric element 1, the piezoelectric at a portion not projecting portion
Since the element 1 is not completely in contact with the deformation amplifying means 2, it vibrates due to a small body movement of the human body 16 . This vibration is
Since pressure is intensively applied to the convex portion 13, the vibration has a larger swing width than when there is no convex portion, and a large output is generated. Further, when there are a plurality of protrusions 13, the piezoelectric element
The vibration of the child 1 is divided into a plurality of small vibration having the maximum swing width portion not protruding portion, the piezoelectric higher projections 13 are often
The total deformation of the element 1 increases, and the voltage generated from the piezoelectric element 1 also increases. Therefore, the magnitude of the output voltage of the piezoelectric element 1 can be controlled by the protrusion 13, and the protrusion 1
It is possible to generate a larger voltage than in the case where there is no 3. The voltage signal generated from the piezoelectric element 1 in this manner is filtered by a filter 7 for a specific frequency component, amplified by a signal amplifying unit 8, smoothed by a smoothing unit 9, and then determined by a determining unit 10. Although the presence or absence of presence of the human body 16 is determined, since it larger than that in the absence of the voltage signal generated from the piezoelectric element 1 of the convex portion 13 of the deformation amount amplification unit 2, the amplification factor of the signal amplification means 8 It is possible to reduce the size and omit the signal amplifying means 8.

By the above operation, a weak signal obtained from a weak body motion of the human body 16 at rest can be increased.
It is possible to determine the presence or absence of the human body 16 on the device with a small amplification factor, and thus it is possible to provide a human body detection device with a simple circuit and little influence of noise.

Next, a second embodiment of the present invention will be described with reference to the accompanying drawings. This Example illustrates a reference example of the human body detecting device. Figure 5 is a block diagram of the present embodiment, FIG. 6 is a sectional view of the seat 11 which established the human body detecting device of this reference example, FIG. 7 is resting
It is an enlarged view of the seat cross section at the time . 5, 6, that the present embodiment is different from the first embodiment in FIG. 7, the amount of deformation <br/> amplifying means 2 in that it is installed on the body 16 side of the piezoelectric element 1.

The operation of the above configuration will be described below. No.
In the human body detecting means of the first embodiment, since the convex portion 13 of the deformation amount amplifying means 2 is provided on the human body 16 side, the pressure of the human body 16 is concentrated on the convex portion 13 and the voltage signal generated from the piezoelectric element 1 is generated. When the convex portion 13 of the deformation amount amplifying means 2 is increased in order to increase the size, it has been found that when sitting, the pressure from the convex portion 13 is transmitted to the human body 16 and the sitting feeling is deteriorated. In order to solve this problem, the deformation amount amplifying means 2 is a human body of the piezoelectric element 1.
16 side.

[0020] will be described below the action by the configuration of the above-mentioned reference example. When the human body 16 is seated on the seat 11, the surface cloth of the seat 11
The deformation amplifying means 2 disposed below the pressure member 14 presses the piezoelectric element 1 by the pressure of the human body 16 , and the piezoelectric element 1 is deformed, so that a voltage is generated by the piezoelectric effect. The fine body movement of the body propagated by cardiac activity and respiratory activity of the seated <br/> human body 16 is kept resting body 16
The piezoelectric element 1 vibrates and a minute signal is generated. FIG. 7 shows an enlarged view of a section of the seat at rest. At rest, the deformation amplifying means 2 vibrates due to the slight movement of the human body 16 , and this vibration is deformed.
Transmitted to the piezoelectric element 1 by the convex portion 13 of the quantity amplifying means 2,
The piezoelectric element 1 is vibrated deformed, since the portion not projecting portion piezoelectric element 1 and the deformation amount amplification unit 2 is not in contact with the piezoelectric
The piezoelectric element 1 is hardly deformed without being transmitted to the element 1. At this time, the vibration of the convex portion 13 is a vibration having a larger swing width than the case without the convex portion 13 because the pressure of the human body 16 is applied intensively to the convex portion 13, and a large output is generated from the piezoelectric element 1. I do. Further, when there are a plurality of protrusions 13, the vibration of the piezoelectric element 1 is reduced as shown in FIG.
Since is divided into a plurality of small vibration having the maximum swing width, as the convex portion 13 is large becomes large deformation amount of the piezoelectric element 1, the voltage also increases generated from the piezoelectric element 1. Therefore, it is possible to control the magnitude of the output voltage of the piezoelectric element 1 by the protrusion 13, and it is possible to generate a higher voltage than when there is no protrusion 13. Thus the piezoelectric element
The voltage signal generated by the slave 1, a specific frequency component in the filter 7 is filtered, is amplified by the signal amplifying means 8, after being smoothed by the smoothing means 9, in the determination means 10 of the human body 16 The presence or absence is determined, but the piezoelectric element
Protrusions 1 of the voltage signal deformation amount amplification unit 2 for generating from a child 1
3, the signal amplifying means 8
Can be reduced or the signal amplifying means 8 can be omitted. Further, the convex portion 13 of the deformation amount amplification unit 2 is variable
Since it is not on the side of the human body 16 of the shape amplifying means 2, the pressure does not concentrate on a certain point and the feeling of sitting does not deteriorate.

[0021] However, the output of the piezoelectric element 1 of the present embodiment, the first
Compared to the first embodiment, between the body 16 and the piezoelectric element 1
Since there is a deformation amount amplification unit 2, the vibration of the human body 16 is directly pressure
Since it is not added to the electric element 1 and is absorbed by the deformation amplifying means 2, it becomes smaller under the same conditions.

By the above operation, the piezoelectric element is placed on the human body 16 side.
By installing the deformation amount amplifying means, it is possible to increase the deformation amount of the piezoelectric element due to minute body movement of the body at rest without concentrating the pressure of the human body 16 on a specific part, and generate from the piezoelectric element. Since it is possible to determine the presence or absence of the human body 16 with a small amplification factor without deteriorating the seating feeling, it is possible to determine the presence / absence of the human body 16 without deteriorating the seating feeling. Can be provided.

Next, a description will be given of a second embodiment of the present invention in the accompanying drawings. In this embodiment, an embodiment of a human body detection device will be described. 8 is a block diagram of the present embodiment, FIG. 9 is a cross-sectional view of a seat 11 on which the human body detection device of the present embodiment is installed , and FIG.
It is an enlarged view of the seat cross section at the time of rest . 8, 9 , and 10
That this embodiment differs from the first actual施例and second reference example <br/> the first modification to the body 16 side of the piezoelectric element 1 in
The amount amplification unit 17 lies in that with two deformation amount amplification unit of the second deformation amount amplification unit 18 to the body 16 opposite.

The operation of the above configuration will be described below. No.
In the first real施例and second reference example, the piezoelectric element 1 because the distance between As you increase the protrusion 13 protruding portions in order to increase the signal obtained from the piezoelectric element 1 is narrowed It has been found that the output of the piezoelectric element 1 cannot be increased any more if the amplitude of the vibration is reduced and the number of the protrusions 13 is increased to some extent. Further, when the deformation amount amplifying means 2 is installed on the human body 16 side of the piezoelectric element 1 in order to improve the feeling of sitting as in the second reference example, there is a change as in the first embodiment.
It was found that the output of the piezoelectric element 1 was smaller than when the shape amplifying means 2 was installed on the side of the piezoelectric element 1 opposite to the human body 16 . In order to solve these problems, the human body detection device according to the present embodiment includes a first deformation amount amplification unit 17 on the side of the human body 16 of the piezoelectric element 1 and a second deformation amount amplification unit 1 on the side opposite to the human body 16.
Have eight.

The operation of the above embodiment will be described below. When the human body 16 is seated on the seat 11, the surface cloth of the seat 11
14 pressure by the first deformation amount amplification unit 17 installed in the lower
The electric element 1 is pressed, and the piezoelectric element 1 is pressed against the second deformation amplifying means 18 on the opposite side of the human body 16 to be deformed, and a voltage is generated by the piezoelectric effect. When seated occupant 16 is kept resting state, as shown in FIG. 8, the piezoelectric element 1 and the first deformation amount amplification unit 17 second variant
Are held in form of being squeezed both forms amount amplification unit 18, the heart of a human body 16 activity and respiratory activity by vibration due to very small body movement is the first modification of the body 16 side of the body to be propagated
The piezoelectric element so applied to the piezoelectric element 1 via the amount amplifying means
The child 1 vibrates and generates a small signal. FIG. 10 shows an enlarged view of a seat cross section at rest. Here, the convex portion 20 of the second deformation amount amplifying means 18 is provided between the convex portions 19 of the first deformation amount amplifying means 17 and the second deformation amount amplifying means 1.
The first deformation amount amplification unit between 8 protrusion 20 and the protrusion 20 of 1
7 are arranged so that the convex portion 19 comes, and two deformations
The convex portions 19, 20 of the amount amplification unit to compress the piezoelectric element 1 in the opposite directions, increases the amount of deformation of the piezoelectric element 1 in comparison with the case of providing a convex portion on only one side of the piezoelectric element 1, and more A large voltage can be generated. Also, even if the interval between the projections is narrowed, the projections of the two deformation amount amplifying means are piezoelectric.
If each part of the element 1 is pressed and the amplitude of vibration can be sufficiently taken, the amount of deformation of the piezoelectric element 1 can be increased, and a larger voltage can be generated. in this way
Voltage signal generated from the piezoelectric element 1, the specific frequency component in the filter 7 is filtered, is amplified by the signal amplifying means 8, after being smoothed by the smoothing means 9, human in the determination means 10 16 The presence or absence of is determined,
Since the voltage signal generated from the piezoelectric element 1 is larger than when there is no deformation amount amplifying means or when only one of them is used,
The amplification factor of the signal amplifying means 8 can be reduced,
Can be omitted. Further, the convex portion 19 of the first deformation amount amplification unit 17 is not in the human body 16 side not concentrated on a certain point the pressure of the body 16, also projecting portion 20 of the second deformation amount amplification unit 18 body 16 Since there is the first deformation amount amplifying means 17 between them, the pressure is not directly applied to the human body 16 , so that the feeling of sitting does not deteriorate.

[0026] The above-described action, by placing the two deformation amount amplification unit to both sides of the piezoelectric element 1, at rest without focusing the pressure of the body 16 to a specific part human body 16
The amount of deformation of the piezoelectric element 1 due to the minute body movement can be increased,
Since the voltage generated from the piezoelectric element 1 can be increased, the human body 1 can be amplified with a small amplification factor without deteriorating the feeling of sitting.
6 can be determined, and therefore, there is an effect that it is possible to provide a human body detection device with a simple circuit and little influence of noise.

In the above-mentioned reference example and embodiment, the deformation amount amplifying means 2, the first deformation amount amplifying means 17, and the second
Although the deformation amplifying means 18 is made of synthetic resin, it may be made of a material which is easily deformed by pressure of urethane or the like. However, in this case, since the convex portion which receives the weight of the human body 16 intensively is soft, the deformation of the piezoelectric element is small, and the effect may be reduced. Further, a flat material made of a relatively soft material such as urethane and a projection made of a relatively hard material such as a synthetic resin may be attached.

Also, in the above reference examples and embodiments, the piezoelectric
The element 1 has a deformation amount amplifying means 2 and a first deformation amount amplifying means 1
7, and a pressure such as a sponge is applied between the deformation amplifying means and the piezoelectric element 1 in order to prevent a sudden impact from being applied from the respective convex portions 19 and 20 of the second deformation amplifying means 18. Absorption means may be added.

With the human body detecting device of the above embodiment, it is possible to accurately grasp the number of occupants and vacant seats in a theater or a car, and control the presence of a bed in a hospital or the like with a small amplification factor.
Also, if it is applied to air conditioning control and sound field control in a room or a car,
Air-conditioning control and sound field control can be performed according to the occupant's location, thereby increasing indoor comfort.

[0030]

Human body detection instrumentation of the onset Akira As described above, according to the present invention
According to the arrangement , the following effects can be obtained.

[0031] That is, the piezoelectric by at least one projection provided on arranged deformation amount <br/> amplifying means between the vibration of the human body <br/> applied from the vibration input unit vibration input portion and the piezoelectric element
Amplification is performed so that the deformation amount of the element is increased, and the amplified deformation amount is applied to the piezoelectric element to generate a large output signal due to the amplified deformation amount.
The human body at rest even with a small amplification rate
A minute vibration can be detected.

The vibration of the human body applied from the vibration input unit
Movement between the vibration input section and the piezoelectric element, and vibration of the piezoelectric element.
Each of the deformation amplification means arranged on the opposite side of the dynamic input section
At least one protrusion provided on the piezoelectric element side.
Amplify so that the amount of deformation of the piezoelectric element increases
Large output signal due to the amplified deformation
Can be generated, so when the vibration of the object is weak
Can easily detect vibration. Furthermore, vibrations due to minute body movements at rest can be amplified and applied to the piezoelectric element so that the amount of deformation of the piezoelectric element is increased without concentrating the pressure of the human body on a specific part. The voltage generated from the piezoelectric element can be increased without causing pressure, and the human body can feel pressure even with a small amplification factor.
That Ru can detect the vibration of a person at rest without.

[Brief description of the drawings]

[1] (a) cross-sectional view of a state in which the piezoelectric elements are the most pressure on the first cross-sectional view of a state in which the piezoelectric elements of the vibration detecting device is not the most pressing in Reference Example (b) the apparatus

FIG. 2 is a block diagram of a human body detection device according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a seat of the device.

FIG. 4 is an enlarged sectional view of a seat of the device.

FIG. 5 is a block diagram of a human body detection device according to a second reference example;

FIG. 6 is a sectional view of a seat of the device.

FIG. 7 is an enlarged sectional view of a seat of the device.

FIG. 8 is a block diagram of a human body detection device according to a second embodiment of the present invention.

FIG. 9 is a sectional view of a seat of the device.

FIG. 10 is an enlarged view of a cross section of a seat of the device.

FIG. 11 is a block diagram of a conventional human body detection device.

FIG. 12 is a waveform diagram of an output signal of a smoothing unit of the apparatus.

[Explanation of symbols]

1 Piezoelectric element 2 Deformation amount amplifying means 3 Vibration input unit 6 Object 7 Filter 8 Signal amplifying means 9 Smoothing means 10 Judging means 11 Seat 13 Protrusion of deformation amount amplifying means 17 First deformation amount amplifying means 18 Second deformation Amount amplification means 19 Projection of first deformation amplification means 20 Projection of second deformation amplification means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-367651 (JP, A) JP-A-69-196901 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01V 9/00 A61B 5/103 G01H 11/08

Claims (2)

(57) [Claims] And 1. A vibration input unit which receives a physical vibration, a piezoelectric element for generating an output signal in response to the amount of deformation deformed by vibration applied, the input vibration in the vibration input portion and the The pressure is adjusted so that the amount of deformation of the piezoelectric element increases.
Ri Do from deformation amount amplification means for applying the electric element, the piezoelectric element is vibrating
Arranged between the dynamic input unit and the deformation amount amplifying means, and
At least one deformation amplifying means is provided on the surface on the piezoelectric element side.
Using a vibration detecting device having a configuration having
The motion input unit is disposed on the contact surface with the human body,
A human body that has a determination means for determining the presence or absence of a human body based on the output
Detection device. 2. A vibration input unit for receiving a physical vibration,
Deformation due to the applied vibration and output signal according to the amount of deformation
And a piezoelectric element that generates a signal,
The vibration is applied to the piezoelectric element so that the amount of deformation of the piezoelectric element is increased.
Consists deformation amount amplification means for applying the electric element, the deformation amount amplification unit vibration input between and piezoelectric elements of the vibration input portion and the piezoelectric element
Each is provided with a force unit on the opposite side, the respective deformation
A vibration detecting device having at least one convex portion on the surface of the quantity amplifying means on the side of the piezoelectric element;
Part is placed on the contact surface with the human body, and the output of the piezoelectric element
Human body detection device having a determination means for determining the presence or absence of a human body based on
Place.