Biological motion information acquisition device

Abstract

To capture changes in respiratory muscles and trunk muscles as changes in distance by using a distance sensor is employed in place of a pressure sensor.SOLUTION: A biological movement information acquisition device comprises an orthotic part with wearing means on one side thereof to be worn on a clothing part, a distance sensor provided on the other side of the orthotic part and positioned toward the living body, and an elastic, hollow, dome-shaped pressure contactor consisting of a ceiling part which encases the distance sensor and is fixed to the orthotic part and a side circumferential wall continuing from the ceiling part. The wall thickness of the ceiling part is thicker than the wall thickness of the side circumferential walls. Contraction of muscles, including respiratory and trunk muscles, due to body movements is detected by distance data that varies toward the living body from an inner surface of the ceiling part of the pressure contactor to the distance sensor.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a biological motion information acquiring device that uses a distance sensor to detect muscle movements caused by body movements. [Background technology]

[0002] 2. Description of the Related Art Conventionally, detection devices have been widely used that detect vibrations in a living body by attaching a detector to the torso of a subject.

[0003] In addition, detection devices such as sensor devices have been proposed that are attached to the body surface while being pressurized in a direction that controls the displacement of the body surface due to a person's breathing, and convert pressure changes due to the displacement of the body surface into electrical signals to detect them (see, for example, Patent Document 1).

[0004] Furthermore, the present inventors have proposed a biological motion information acquisition device that detects muscle contractions, including respiratory muscles and trunk muscles, caused by physical movements by pressing a pressure sensor against the abdominal region of a living body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-174784 Summary of the Invention [Problem to be solved by the invention]

[0006] In order to realize a biological motion information acquisition device that uses a distance sensor instead of a pressure sensor, the inventors created a hollow dome-shaped pressure contact part and conducted an experiment to compare the deformation state of the pressure contact part when it was placed against the abdominal region of a living body with the numerical values obtained from the distance sensor.

[0007] A hollow dome-shaped pressure contact part (hereinafter simply referred to as "pressure contact part") 101 made of resin-molded elastic silicone rubber and elliptical in plan view was prepared (see FIG. 1), and an infrared sensor 102 was prepared as a distance sensor. The opening on the opposite side of the ceiling part 103 of the pressure contact part 101 was covered with a base 104 with the infrared sensor 102 placed in the center, and the peripheral edge face of the opening of the pressure contact part 101 was aligned and fixed to the outer periphery of the base 104 so that the infrared sensor 102 was enclosed and covered facing the living body. The infrared sensor 102 was wired to a circuit board (not shown) placed outside the pressure contact part 101, and data on the intensity of reflected light was collected.

[0008] Test 1 (Comparative Example)

[0009] The pressure-welded portion used in Test 1 had the same external shape as the pressure-welded portion 101 shown in Figure 1, and the thickness of the pressure-welded portion 101 was formed to be thin and uniform as shown in Figure 2. Figure 2 is a longitudinal cross-sectional view showing the change in shape of the pressure-welded portion 101 over time when the ceiling portion 103 of the pressure-welded portion 101 is gradually pressed toward the base 104, where (a) shows the state when not compressed, (b) shows the state when lightly compressed, (c) shows the state when medium compressed, and (d) shows the state when heavily compressed.

[0010] In Test 1, in response to pressure applied upward (in the direction of the arrow) from below toward the base 104 in Fig. 2(a), first, as shown in Fig. 2(b), the side walls 105 of the pressure contact portion 101 remained substantially unchanged and maintained their original shape, while only the central ceiling portion 103 was compressed and deformed to become concave, approaching the infrared sensor 102. Next, as shown in Fig. 2(c), the side walls 105 deformed to expand outward, further deepening the concavity of the ceiling portion 103. Thereafter, the gap between the ceiling portion 103 and the base 104 remained substantially unchanged, with the ceiling portion 103 in contact with the infrared sensor 102, as shown in Fig. 2(c) and Fig. 2(d), and no compressive change in the pressure contact portion 101 was observed.

[0011] Test 2 (Embodiment 1)

[0012] The crimped portion 1 used in Test 2 had the same shape as the crimped portion 101 in Test 1, except that the thickness of the ceiling portion 103 in the crimped portion 101 shown in Figure 2 was made thicker than the thickness of the side peripheral wall 105 (5), forming a ceiling portion 3. Figure 3 is a longitudinal cross-sectional view showing the change in shape of the crimped portion 1 over time when the ceiling portion 3 of the crimped portion 1 is gradually pressed toward the base 4 (104), where (a) shows the state when not compressed, (b) shows the state when lightly compressed, (c) shows the state when medium compressed, and (d) shows the state when heavily compressed.

[0013] In Test 2, because the ceiling 3 of the pressure contact 1 was thick, no depression occurred in the ceiling 3 as shown in Figures 2(b) and (c) in Test 1. Instead, the ceiling 3 was compressed while maintaining its flat thickness, and the pressure contact 1, including the peripheral wall 5, gradually shifted toward the base 4. With further pressure, the inner surface of the ceiling 3 came into substantial contact with the base, as shown in Figure 3(d). During light compression (b) in this test, the ceiling 3, which is the center of the pressure contact 1, was thick and therefore compressed while maintaining its flatness. During medium compression (c), the center was compressed and the peripheral areas, being thinner, bulged outward. During heavy compression (d), the center came into contact with the sensor.

[0014] Test 3 (Embodiment 2)

[0015] The crimped part 1 used in Test 3 had the same shape as the crimped part 1 in Test 2, except that a ridge-like rib 6 was formed on the inside of the ceiling part 3, which was made thicker than the side peripheral wall 5 of the crimped part 1 shown in Figure 3, running around the thick part of the ceiling part 3. Figure 4 is a longitudinal cross-sectional view showing the change in shape of the crimped part 1 over time when the ceiling part 3 of the crimped part 1 is gradually pressed against the base 4, with (a) showing the state when not compressed, (b) showing the state when lightly compressed, (c) showing the state when medium compressed, and (d) showing the state when heavily compressed.

[0016] In Test 3, as in Test 2, no depression occurred in the ceiling 3 when pressure was applied in the direction of the arrow, as shown in Figure 4(b), and the pressure-contact portion 1, including the side peripheral wall 5, gradually deformed toward the base 4 while maintaining its flat thickness. Next, in response to further pressure, simulating an obese person, as shown in Figure 4(c), the rib 6 abutted against the base 4 on which the infrared sensor 2 (102) was located, and as shown in Figure 4(d), the ceiling 3 gradually changed shape and was pushed toward the infrared sensor 2, with the rib 6 as the fulcrum. In this test, during light compression (b), the elasticity of the periphery caused compression, while during medium compression (c), the rib 6 came into contact with the base 4, acting as a stopper, changing the compression force, and during heavy compression (d), the center depression occurred with the rib 6 as the axis.

[0017] Figure 5 is a graph showing the results of measuring the distance caused by deformation of the pressure-welded part using an infrared sensor in Tests 1, 2, and 3. The horizontal axis is the compression distance in mm, the vertical axis is the data level quantified from the intensity of reflected light, the curve consisting of dotted lines corresponds to Test 1, the curve consisting of dashed lines corresponds to Test 2, and the curve consisting of solid lines corresponds to Test 3. In the figure, a, b, c, and d correspond to the positions of states (a), (b), (c), and (d) in Figures 2, 3, and 4.

[0018] According to the graph in Figure 5, in Test 1, as shown by the dotted line graph, the change in distance in response to pressure increased sharply from position b to position c. After position c, the ceiling contacted the infrared sensor, and compression of the pressure contact point reached saturation, resulting in no change in distance in response to pressure. Furthermore, in Test 2, as shown by the dashed-dotted line graph, the overall slope of the change in distance in response to pressure was gentler than in the dotted line graph in Test 1. Furthermore, because the change in distance in response to pressure continued to appear on the graph after position c, it was confirmed that the device could be used as a pressure contact point for biological motion information acquisition devices. Furthermore, in Test 3, as shown by the solid line graph, the change in distance in response to pressure overall, including the change around the rib, was consistent with the change in distance.

[0019] From Tests 2 and 3, it was discovered that in order to use a distance sensor instead of a pressure sensor, if the pressure contact means that is pressed against the living body is made into a hollow dome-shaped body and the thickness of the ceiling part of the dome-shaped body is made thicker than the thickness of the side walls, the compressive deformation of the pressure contact part can be quantified by the distance sensor even if there are individual differences in the subject's body shape and the tightening strength due to wearing, and the above technical objective was achieved. [Means for solving the problem]

[0020] The above technical problems can be solved by the present invention as follows.

[0021] In other words, the biological motion information acquisition device of the present invention comprises an appliance part having an attachment means on one side to be attached to a clothing part, a distance sensor provided on the other side of the appliance part and positioned toward the living body, and an elastic, hollow, dome-shaped pressure-contact part consisting of a ceiling part and side walls continuing from the ceiling part, which is fixed to the appliance part and contains the distance sensor, and the thickness of the ceiling part is formed thicker than the thickness of the side walls, and the contraction of muscles including respiratory muscles and trunk muscles due to physical movement is detected by distance data that changes from the inner surface of the ceiling part of the pressure-contact part toward the living body from the distance sensor.

[0022] In addition, the biological motion information acquisition device of the present invention comprises an appliance part having an attachment means on one side to be attached to a clothing part, a distance sensor provided on the other side of the appliance part and positioned toward the living body, and an elastic hollow dome-shaped pressure contact part consisting of a ceiling part and side walls continuing from the ceiling part, which is fixed to the appliance part and contains the distance sensor, and the thickness of the ceiling part is formed thicker than the thickness of the side walls, and the pressure contact part is compressed and deformed when pressed against the living body, and changes in the proximity of the inner surface of the ceiling part to the distance sensor are detected using distance data.

[0023] In addition, the biological motion information acquisition device of the present invention comprises an appliance part having an attachment means on one side to be attached to a clothing part, a distance sensor provided on the other side of the appliance part and positioned toward the living body, and an elastic, hollow, dome-shaped pressure-contact part consisting of a ceiling part and side walls continuing from the ceiling part, which is fixed to the appliance part and contains the distance sensor, and the thickness of the ceiling part is formed thicker than the thickness of the side walls, and when the pressure-contact part is pressed against the living body, the ceiling part, including the side walls, deforms and moves in width toward the distance sensor, and the change in the proximity of the inner surface of the ceiling part to the distance sensor is detected using distance data.

[0024] Furthermore, in any of the above-mentioned biological motion information acquisition devices, the present invention provides a ceiling portion that is thicker than the side wall, and on the inside of the ceiling portion, a rib is formed that runs in a ridge-like manner around the thick portion of the ceiling portion. [Effects of the Invention]

[0025] According to the present invention, the pressure contact means that is pressed against the abdominal area is a hollow dome-shaped body, and the thickness of the ceiling of the dome-shaped body is made thicker than the thickness of the side walls. Therefore, a distance sensor can be used instead of a pressure sensor, and changes in the respiratory muscles and trunk muscles can be detected as changes in distance from the abdominal circumference. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 10 is a perspective view showing a hollow dome-shaped press-contact portion having an elliptical shape in a plan view. [Figure 2] FIG. 10 is a longitudinal cross-sectional view showing the change in pressure of the dome-shaped press-contact portion in time series in Test 1. [Figure 3] FIG. 10 is a longitudinal cross-sectional view showing the change in pressure of the dome-shaped press-welded portion in time series in Test 2. [Figure 4] FIG. 10 is a longitudinal cross-sectional view showing the change in pressure of the dome-shaped press-welded portion in time series in Test 3. [Figure 5] 10 is a graph showing the results of measuring the compression distance of the infrared sensor due to deformation of the pressure-welded portion in Tests 1, 2, and 3. [Figure 6]FIG. 2 is a perspective view of the biological motion information acquisition device as seen from the attachment side. [Figure 7] FIG. 2 is a perspective view of the biological motion information acquiring device as seen from the dome side. [Figure 8] FIG. 2 is a side view showing the biological motion information acquisition device attached to clothing. [Figure 9] FIG. 2 is an exploded perspective view showing the structure of the biological motion information acquiring device. [Figure 10] FIG. 1 is an explanatory diagram of a biological motion information acquiring device. [Figure 11] 10A and 10B are explanatory diagrams showing an example of a pressure contact part in the biological motion information acquiring device. [Figure 12] FIG. 10 is an analytical graph of distance data obtained in the examples. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0028] Embodiment 1 The pressure-contact portion in this embodiment corresponds to the pressure-contact portion in Test 2, and will be described with reference to Figures 3 and 5 to 9. In these figures, the same reference numerals indicate the same or corresponding parts.

[0029] 3, the pressure contact portion 1 in this embodiment is formed by resin molding into a hollow dome shape having elasticity, and the thickness of the ceiling portion 3 in the pressure contact portion 1 is formed to be thicker than the thickness of the side peripheral wall 5. The infrared sensor 2 is positioned and disposed at the opening of the pressure contact portion 1 on the opposite side of the ceiling portion 3, facing the ceiling portion 3, and is configured so that the infrared sensor 2 is enclosed and covered by the pressure contact portion 1, facing the living body.

[0030] 6 and 7, reference numeral 7 denotes a biological motion information acquisition device (hereinafter referred to as "acquisition device") having an elliptical shape in a plan view, which detects muscle contractions (contractional contractions and eccentric contractions) due to daily physical movements including breathing. As shown in FIG. 9, the device comprises a spring pressure holder (attachment means) 8, which is fitted to a clothing part and is made by bending a highly rigid wire such as a piano wire into a U-shape to form clamping pieces 8a and bending both end sides downward in a U-shape to form holding pieces 8b, 8b; a ring-shaped guard cover 9, which forms the outer frame of the acquisition device 7, and which has through-holes 9a, 9a for inserting the holding pieces 8b, opened at bilaterally symmetrical positions parallel to the minor axis of the ellipse; and a circuit board 1. and a guard cover 9 on the outer periphery of the holder 8. The holder 8 has a recess for receiving a battery 10a and a flange 4a on its outer periphery that fits around the outer periphery of a later-described pressure contact portion 1 by sandwiching it together with the guard cover 9, and has insertion holes 4b, 4b for inserting the holding pieces 8b at positions corresponding to the two through holes 9a formed in the guard cover 9. An information management unit 11 is disposed on the circuit board 10 and includes a battery 10a and an infrared sensor (distance sensor) 2 and acquires distance data from the infrared sensor 2. A base cover 12 covers the base 4 except for the infrared sensor 2 wired to the circuit board 10. The hollow dome-shaped pressure contact portion 1 (see FIGS. 3, 6, and 7) is also provided. By inserting the two holding pieces 8b of the holder 8 into the two through holes 9a of the guard cover 9 and into the two insertion holes 4b of the base 4, a clamping action is obtained in the gap between the clamping pieces 8a of the holder 8 and the back surface of the base 4. The acquisition device 7 is then held in place by being inserted into the gap by a short side of the clothing or its belt 13 (see FIG. 8). This allows the vibration of the living body caused by muscle contraction, including respiratory muscles and trunk muscles, due to body movement to be acquired as distance data. In FIG. 8, 14 denotes the subject, and 15 denotes clothing such as slacks.

[0031] The pressure contact portion 1 is formed, for example, by resin molding, into a hollow dome shape that is elastic and approximately circular in a planar view (e.g., elliptical), and the side walls 5 are made thin and the ceiling portion 2 is made thick.As a result, when pressed in the direction of the arrow in Figure 3, as shown in (b) and (c) of Figure 3, no depression occurs in the ceiling portion 3, and the ceiling portion 3 is compressed while maintaining its thickness plane, and the pressure contact portion 1, including the side walls 5, is gradually deformed so that it is pushed wider towards the base 4, and when pressed further, the inner surface of the ceiling portion 3 comes into approximate contact with the base portion, as shown in (d) of Figure 3.Therefore, even if there are individual differences in the body shape of the subject 14 (see Figure 8) and the tightening strength due to wearing, the compressive deformation of the pressure contact portion can be quantified by a distance sensor.

[0032] The information management unit 11 has a function of acquiring distance data from the infrared sensor 2 and transmitting the data to a mobile terminal (not shown) such as a smart device.

[0033] In this embodiment, the term "approximately circular in plan view" may refer to either a circle or an ellipse. The distance sensor may be an infrared sensor, a visible light sensor, or an ultrasonic sensor. The attachment means may be a stopper molded with an inverted U-shaped cross section or a clamping stopper. The resin may be a synthetic resin such as an elastic silicone resin, specifically silicone rubber.

[0034] In addition to the distance sensor 2, the circuit board 10 may be provided with input switches corresponding to each physical movement, such as sitting, walking, and running, and may be wired to include a memory unit that stores distance data obtained from the distance sensor 2 and information on physical movements associated with the distance data, a display unit that displays muscle contraction information, including respiratory muscles and trunk muscles, resulting from physical movements obtained from the distance data, and the physical movements, and a control unit that controls the memory unit to store the contraction information in association with the physical movement selected by the input switch and display it on the display unit.

[0035] Furthermore, the information management unit 11 may be provided with a control unit that, when an input switch is pressed to select a physical movement, associates the designated physical movement with the distance information at that time, and if distance information similar to this distance information is subsequently obtained, continues to associate and record the same physical movement. Furthermore, the information management unit 11 may be controlled by the control unit to record the distance information obtained by the distance sensor in association with the physical movement, and display the distance information and the physical movement in association on the display unit.

[0036] According to this embodiment, the device comprises a base (apparatus part) 4 having at least a circuit board 10 arranged thereon and a holder (attachment means) 8 to be attached to a clothing part on one side, an infrared sensor (distance sensor) 2 positioned toward the living body on the other side of the base 4, an information management unit 11 that acquires muscle contractions, including respiratory muscles and trunk muscles, due to physical movements as distance data from the infrared sensor 2, and a hollow dome-shaped pressure contact part 1 that contains the infrared sensor 2 and is fixed to the base 4.The thickness of the ceiling part 3 of the dome-shaped pressure contact part 1 is made thicker than the thickness of the central side wall 5, so that when the dome-shaped pressure contact part 1 is pressed against the living body 14, the ceiling part 3 is compressed while maintaining its thickness plane, and the ceiling part 3, including the side wall 5, deforms in width toward the infrared sensor 2, thereby making it possible to detect changes in the proximity of the inner surface of the ceiling part 3 to the infrared sensor 2 by the distance data that changes toward the living body. In this embodiment, at least the base 4 constitutes the equipment part, but the equipment part may also include the guide cover 9 and the base cover 12 in addition to the base 4.

[0037] Embodiment 2 The pressure-contact portion in this embodiment corresponds to the pressure-contact portion in Test 3 and will be described with reference to FIGS. 4 and 5 to 9. FIG. 10 is a schematic cross-sectional view of the acquisition device 7 shown in FIG. 9 (the holder 8 and information management unit 11 are not shown). Also, (a) of FIG. 10 corresponds to (a) of FIG. 4, (b) of FIG. 10 corresponds to (b) of FIG. 4, (c) of FIG. 10 corresponds to (c) of FIG. 4, and (d) of FIG. 10 corresponds to (d) of FIG. 4. In these figures, the same reference numerals indicate the same or corresponding parts. In FIG. 10, the infrared sensor 3 is shown divided into an infrared LED 3a and a photosensor 3b. The light path along which the infrared light output from the infrared LED 3a reaches the inner thickness plane 3a of the ceiling portion 3 and is reflected from the inner surface 3a and received by the photosensor 3b is represented by a thin line.

[0038] As shown in Figure 10, the pressure-contact portion 1 in this embodiment has a ceiling portion 3 that is thicker than the side wall 5 of the pressure-contact portion 1 in embodiment 1, and on the inside of this ceiling portion 3, a rib 6 is formed that runs in a ridge-like shape around the thick portion of the ceiling portion 3.

[0039] In this embodiment, a rib 6 is provided on the inner surface 3a of the ceiling 3, which is the inside of the ceiling 3, and so when pressed in the direction of the arrow shown in Fig. 10, as shown in Figs. 10(b) and (c) similarly to Figs. 4(b) and (c), the ceiling 3 does not dent, but gradually deforms, including the side peripheral wall 5 of the pressure-contact portion 1, toward the base 4 while maintaining its thickness, and the rib 6 abuts against the base cover 12, which acts as a board pressing plate, as shown in Fig. 10(c) similarly to Fig. 4(c). Then, when further pressure is applied, assuming an obese person, as shown in Fig. 10(d) similarly to Fig. 4(d), the rib 6 abuts against the base cover 12 of the base 4 on which the infrared sensor 2 is disposed, and thereafter, the rib 6 acts as a fulcrum, causing the ceiling 3 to gradually change shape and be pressed toward the infrared sensor 2. The compressive force changes before and after the rib 6 comes into contact with the base cover 12, and the inner ceiling part 3 surrounded by the rib 6 is deformed so as to gradually recess toward the infrared sensor 2.

[0040] According to this embodiment, a fulcrum that blocks the pressure contact is provided on the inner surface of the ceiling portion 3 in embodiment 1, and compression due to pressure occurs in the inner space formed by this fulcrum. Therefore, the compressive deformation of the pressure contact portion in the proximity range can be quantified more accurately using a distance sensor.

[0041] [Example]

[0042] An example of the pressure-contact portion in the second embodiment will be described with reference to Figures 11 and 12. In Figure 11, (a) of Figure 11 is a design drawing of a front cross section of the pressure-contact portion with the opening facing up, and (b) of Figure 11 is a design drawing of a side cross section.

[0043] As shown in Fig. 11, the outer shape of the insulation displacement portion 1 was an ellipse with a major axis outer dimension of 74 mm, a minor axis outer dimension of 54 mm, and a height outer dimension of 16 mm, the opening diameter was an ellipse with a major axis of 68 mm and a minor axis of 48 mm, and the thickness of the side peripheral wall 5 was 1 mm. The ceiling portion 3 was also an ellipse with a major axis of 58 mm and a minor axis of 38 mm, and the thickness of the ceiling portion 3 was 4 mm. A rib 6 that was elliptical in plan view and had a height of 3 mm and a width of 4 mm was formed on the ceiling portion 3.

[0044] The acquisition device 7 fitted with the pressure contact part 1 was attached to clothing as shown in Figure 8, and distance data obtained from the infrared sensor 2 during desk work was transmitted via the information management unit 11 to a smart device held by the subject 14 and collected.

[0045] The distance data was graphed using Python libraries such as matplotlib, pandas, plotly, and seaborn, with the vertical axis representing data level and the horizontal axis representing time, as shown in Figure 12. This graph shows a waveform derived from breathing, visualizing the subject's periodic apnea.

[0046] The actual dimensions in this embodiment are merely an example, and the shape may be any dimension that can be attached to an approximately circular body. Furthermore, since the biological motion information acquisition device of the present invention detects irregular vibration changes using a distance sensor, it is not limited to these actual dimensions. [Industrial Applicability]

[0047] According to the present invention, changes in respiratory muscles and trunk muscles can be detected as changes in distance from the abdominal circumference, and can therefore be used to understand changes in physical condition. [Explanation of symbols]

[0048] 1, 101 Pressure welding part 2, 102 Infrared sensor 3, 103 Ceiling 4, 104 pedestal 5, 105 Side walls 6. Ribs 7. Biological motion information acquisition device 8 Holder 9 Cover 10 Circuit Board 11 Information Management Department 12 Base cover 13 Belt 14 Living organisms, subjects

Claims

1. A biological movement information acquisition device comprising: an appliance part having an attachment means on one side to be attached to a clothing part; a distance sensor provided on the other side of the appliance part and positioned toward the living body; and an elastic, hollow, dome-shaped pressure-contact part consisting of a ceiling part and side walls continuing from the ceiling part, which is fixed to the appliance part and contains the distance sensor, wherein the thickness of the ceiling part is formed thicker than the thickness of the side walls, and which detects muscle contractions, including respiratory muscles and trunk muscles, caused by physical movement by distance data that changes from the inner surface of the ceiling part of the dome-shaped pressure-contact part toward the living body from the distance sensor.

2. A biological motion information acquisition device comprising: an appliance part having an attachment means on one side to be attached to a part of clothing; a distance sensor provided on the other side of the appliance part and positioned toward the living body; and an elastic, hollow, dome-shaped pressure-contact part consisting of a ceiling part and side walls continuing from the ceiling part, which is fixed to the appliance part and contains the distance sensor, wherein the thickness of the ceiling part is formed thicker than the thickness of the side walls, and the dome-shaped pressure-contact part is compressed and deformed when pressed against the living body, and the device detects changes in the proximity of the inner surface of the ceiling part to the distance sensor using distance data.

3. A biological motion information acquisition device comprising: an appliance part having an attachment means on one side to be attached to a part of clothing; a distance sensor provided on the other side of the appliance part and positioned toward the living body; and an elastic, hollow, dome-shaped pressure-contact part consisting of a ceiling part and side walls continuing from the ceiling part, which is fixed to the appliance part and contains the distance sensor, wherein the thickness of the ceiling part is formed thicker than the thickness of the side walls, and when the dome-shaped pressure-contact part is pressed against the living body, the ceiling part, including the side walls, deforms and moves in width toward the distance sensor, and the proximity change of the inner surface of the ceiling part to the distance sensor is detected using distance data.

4. 4. A biological motion information acquisition device according to claim 1, wherein a ridge-like rib is formed around the thick portion of the ceiling portion on the inner surface of the ceiling portion, which is thicker than the side peripheral wall.

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