JP2844813B2 - Body motion detection device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body motion detection device for detecting a coarse body motion such as a rollover of a human body on a bed to a minute body motion such as a heartbeat or breathing.

2. Description of the Related Art A conventional body movement detecting device of this type will be described with reference to FIGS. 6 and 7. FIG. FIG. 7 shows a cross section taken along the line AA of FIG. As shown in the figure, this body movement detecting device has two metal plates or metal net-shaped antenna members 2a and 2b attached to both surfaces of an insulating plate 1 and insulating members 3a and 3b having different insulating constants on the upper portions thereof. A recording mat 5 formed by overlapping the active layers 3 formed by the above and further covering these with a flexible shield 4 is spread under the mattress 6, and the antenna members 2a and 2b are recorded via the amplifier 7. The device 8 was connected. (For example, Japanese Patent Application Laid-Open No. 55-1605
No. 39) With the above configuration, the potential difference due to the change in the electrostatic charge generated on the clothes, bedding or the mattress 6 due to the body movement of the person sleeping on the bed 9 is amplified and recorded.

However, in the above configuration, the configuration of the recording mat 5 is complicated as described above and the area is as large as that of the mattress, so that the manufacturing cost is high and the portability is cumbersome and practical. In addition, since the recording mat 5 itself has no moisture permeability or hygroscopicity, there is a problem that if the recording mat 5 is continuously used, moisture will accumulate in the mattress 6 and the like, which makes it uncomfortable.

The present invention solves such a conventional problem, and provides a practical body movement detecting device that can be easily used at low cost and that detects body movement without impairing the moisture permeability or moisture absorption of the bedding. The purpose is to:

Means for Solving the Problems In order to solve the above problems, the body motion detection device of the present invention is
The sheet includes a sheet on which a flexible piezoelectric element is provided, and a lead-out section for leading the output of the piezoelectric element to the outside. The sheet has a stretchable portion at the end thereof, It has a detachable part so that the parts can be detached from each other.

Operation According to the present invention, by arranging the sheet on which the piezoelectric elements are disposed on the bedding, the piezoelectric element is deformed by body movement and when a voltage is generated by the piezoelectric effect, the voltage is led to the outside.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of the embodiment. In the figure,
10 is a sheet molded into a bag with good air permeability,
A flexible piezoelectric element 11 is provided inside. The piezoelectric element 11 is made of a polymer piezoelectric material such as polyvinylidene fluoride (PVDF) in the form of a thin film and a flexible electrode film is adhered to both sides, and is molded into a tape shape. It can be produced in The periphery of the piezoelectric element 11 inside the sheet 10 is fixed to the sheet 10 by sewing. 12
Is a stretchable portion made of rubber cord, which is attached to both ends of the sheet 10, and has a detachable portion 13 made of Velcro so that its ends can be detached. FIG. 2 is a perspective view when the seat 10 is mounted in the short direction of the mattress 6. In FIG. 1, a sheet 10 is wound around a mattress 6, and a detachable portion 13 is adhered to a side surface 14 of the mattress 6 to be fixed to the mattress 6. At the end of the sheet 10, a lead-out part 15 for leading the output of the piezoelectric element 11 to the outside is provided. The lead 16 comes out of the lead-out section 15 and the amplifier 17
To the recording device 18 via The lead-out section 15 is provided with a mattress 6 so that the lead 16 is not directly shocked even if the human body jumps on the mattress 6 or the like, while eliminating discomfort at bedtime due to the unevenness of the lead 16. It is located on the side surface 14. Sheet 10
Can be mounted in the longitudinal direction of the mattress 6 as shown in FIG. When going to bed, a bed is made with sheets or the like on the mattress 6 to which the sheet 10 is attached, and the human body goes to bed on it.

In the above configuration, when the piezoelectric element 11 undergoes deformation due to body movement, a voltage is generated by the piezoelectric effect, which is amplified by the amplifier 17 and recorded by the recording device 18. FIGS. 4a and 4b show the output results. While a large output is obtained due to a coarse body movement such as entering a bed or turning over, a small output is obtained in a resting state due to a minute body movement accompanying a heartbeat, respiration, or the like.

By the above-described operation, the piezoelectric element 11 and the sheet 10 for detecting body movement are not complicated as in the conventional case but have a small shape.
Since the mattress 6 has the detachable portion 12 and the mattress 6, even if the width and the thickness of the mattress 6 are slightly different, it is possible to cope with the wearing when the mattress 6 is attached, and there is an effect that the body movement can be detected by easily attaching the seat 10. .

Further, the piezoelectric element 11 and the sheet 10 have a small shape,
Since the sheet 10 is made of cloth, the bedding does not impair the moisture permeability and moisture absorption of the bedding. Therefore, when the mattress 6 is continuously used as in the related art, moisture does not accumulate in the mattress 6 and the mattress 6 does not become uncomfortable.

Further, since the elastic member 12 has the elastic portion 12, even if a severe body movement or the like occurs, the sheet 10 itself is excessively pulled and the piezoelectric element 11
Is not destroyed, and reliability is maintained.

In order to improve the detection accuracy of body movement, a plurality of sheets 10 may be arranged on the mattress 6 as long as the moisture permeability to the mattress 6 is not impaired.

Further, since the sheet 10 is made of a cloth having good air permeability, as shown in FIG. 5, the area of the sheet 10 may be widened and the piezoelectric element 11 may be arranged so as to meander inside.
Since air permeability is secured, moisture does not accumulate as in the conventional case.

In the above embodiment, the sheet 10 is mounted on the mattress 6 of the bed 9; however, the sheet 10 can be mounted on bedding such as a bed or a urethane mat, and has the same effect as above.

As a second embodiment of the present invention, in the above embodiment, the deriving unit
Although 15 is provided at the end of the seat 10, it may be configured to have a connector portion detachable from the lead-out portion 15 at the end of the seat 10, and once the seat 10 is attached to the bedding, Only when necessary, the deriving unit 15 can be connected to the seat 10 to detect body movement, so that it is convenient to use.

As a third embodiment of the present invention, the lead-out section 15 is
A configuration may be adopted in which a transmission unit is provided to wirelessly derive the output from the outside, and once the seat 10 is attached to the bedding, the body movement can be detected whenever necessary thereafter, and the usability is further improved. Further, even when the human body performs an action such as jumping on the mattress 6 or reclining the bed, there is no fear that the lead wire 16 is pulled and the reliability is improved.

Effects of the Invention As described above, according to the body motion detection device of the present invention, the following effects can be obtained.

(1) Since the piezoelectric element and the sheet for detecting body movement are not complicated in configuration and small in shape as in the past, they can be manufactured at a lower cost than in the past, and have a telescopic part and a detachable part. Even if the width and thickness of the bedding such as the mattress and the futon are slightly different, the body movement can be easily detected by wearing the bedding.

(2) Since the piezoelectric element and the sheet are small in shape and do not impair the moisture permeability and moisture absorption of the bedding, if the continuous use of the bedding causes moisture to accumulate in the bedding, it becomes uncomfortable. Nothing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a body movement detecting device according to an embodiment of the present invention, FIGS. 2 and 3 are perspective views when the embodiment is mounted on a mattress, and FIG. FIG. 4b is an enlarged waveform diagram of FIG. 4a, FIG. 5 is a perspective view of a body motion detecting device according to another embodiment of the present invention, and FIG. 6 is a conventional body motion detecting device. FIG. 7 is a sectional view taken along the line AA of FIG. 6 mattress, 10 piezoelectric element, 11 sheet, 12
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Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A61B 5 / 11,5 / 113 A61B 5/00 A61B 5/024

Claims (3)

(57) [Claims] 1. A sheet on which a flexible piezoelectric element is provided, and a lead-out part for leading the output of the piezoelectric element to the outside, wherein the sheet has an elastic part at its end. A body movement detection device having a detachable portion at each end, the detachable portion having end portions detachable from each other. 2. The body movement detecting device according to claim 1, wherein the seat has a connector portion detachable from the lead-out portion. 3. The body movement detecting device according to claim 1, wherein the deriving unit has a transmitting unit that wirelessly derives the output of the piezoelectric element to the outside.