JP2007330638A - Biological signal measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biological signal measuring device for preventing positional displacement between a sensor and an inspecting object following operation of adjusting the attached state. <P>SOLUTION: The pulse sensor 1 comprises an attached section 2 that has a cylindrical shape and is attached to a finger, and a measuring section 7 that faces the inside of a hole 9 formed by the cylindrical shape and detects a biomedical signal. The attached section 2 adjusts the attached state while uniformly maintaining the position relation between the measuring section 7 and the finger. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mechanism for adjusting a mounting state of a biological signal measuring apparatus that measures a signal from a living body with respect to the living body.

  Various mounting devices for mounting a biological signal measuring device for measuring a biological signal on a human body have been proposed. This is because how to hold the sensor portion of the biological signal measuring device at an appropriate position on the human body is a big problem.

  For example, Patent Document 1 describes a configuration in which a pulse wave sensor for measuring a pulse wave is attached to a finger with a band.

  Patent Document 2 describes a band structure in which a biological information observation apparatus is attached to a neck portion by a band body having an elastic band portion.

  Patent Document 3 describes a biological information measuring device holder that does not impair the degree of freedom of the wrist by mounting the holder so as to cover the back of the hand.

  Patent Document 4 describes a configuration in which a pulse wave sensor is attached to a wrist with a band-like band having elasticity.

  Patent Document 5 describes a blood concentration saturation measuring device that does not give a sense of incongruity even if it is always attached to a finger by devising the arrangement of the measurement unit (light emitting element and light receiving element) and making it a ring shape.

Patent Document 6 describes a ring-type biological signal detection device that prevents the mounting portion from rotating by reducing the diameter of the mounting portion using a spring and tightening a finger.
JP 2001-70264 A (published March 21, 2001) JP2003-220041 (released on August 5, 2003) JP 2005-304563 (released November 4, 2005) JP 2005-324004 (released on November 24, 2005) JP 2002-224088 (released on August 13, 2002) JP-A-11-332840 (released December 7, 1999)

  By the way, when a sensor for measuring a biological signal is mounted on a living body (for example, an arm or a finger) and the mounting state is adjusted, it is important that the position of the sensor once attached is not shifted. This is because if the position of the sensor is shifted by adjusting the mounting state, there is a possibility that appropriate measurement cannot be performed.

  However, in the conventional configuration described above, there is a problem that the position of the attached sensor is shifted when adjusting the mounting state.

  Specifically, in the inventions described in Patent Documents 1, 2, and 4, the wearing state is adjusted by adjusting the length of a band wound around a finger or a wrist. However, in this method, when adjusting the length of the band, the entire device rotates on the outer periphery of the finger or the arm due to the force for pulling out the band, so that the position of the sensor arranged on the band is There arises a problem of deviation from the optimum measurement site.

  In the invention described in Patent Document 3, since the band-shaped finger mounting portion to which the sensor is attached is wound around the finger, there is a problem that the position of the sensor is shifted if the winding state of the finger mounting portion is adjusted.

  In the invention described in Patent Document 5, since the wearing state cannot be adjusted according to the size of the user's finger in the first place, if there is a gap between the finger and the measurement unit, the influence of disturbance light and the measurement light A problem arises in that accurate measurement cannot be performed due to disturbance, or the ring rotates and the position of the measurement site and the measurement unit shifts to hinder measurement.

  In the invention described in Patent Document 6, when the end of the mounting portion enters the inside of the aperture and the inner diameter decreases, the sensor moves in the circumferential direction along with the change in the inner diameter. Therefore, the problem that the position of a measurement site | part and a sensor shifts arises.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a biological signal measurement device that is less likely to shift the position of the sensor when the wearing state is adjusted.

  In order to solve the above problems, a biological signal measuring apparatus according to the present invention is a biological signal measuring apparatus that is attached to a measurement site of a living body and measures a biological signal of the living body, and is annular, cylindrical, or those A mounting means having a partial shape and attached to the measurement site; and a detection means for detecting the biological signal facing the inside of the annular shape, the cylindrical shape, or a space formed by the partial shapes, and the mounting The means is characterized in that the mounting state is adjusted while maintaining the positional relationship between the detection means and the measurement site constant.

  According to the above configuration, by inserting the measurement part of the living body into the space of the attachment means, which is formed by an annular shape, a cylindrical shape, or a partial shape thereof, the attachment means can be attached to the measurement part and the detection is directed toward the inside. Means can be brought into contact with the measurement site. And a mounting means adjusts a mounting state, maintaining the positional relationship of a detection means and a measurement site | part constant.

  Therefore, even if the mounting state of the mounting unit with respect to the measurement site is adjusted, the environment in which the detection unit detects the biological signal can be kept constant.

  Further, it is preferable that the mounting means move or deform symmetrically with the measurement site as the center of symmetry.

  With the above configuration, the positional relationship between the detection means and the measurement site can be maintained more constant. The mounting means preferably moves or deforms in a plane-symmetrical manner or an axially symmetrical manner with the measurement site as the center of symmetry.

  In order to solve the above problems, a biological signal measuring apparatus according to the present invention is a biological signal measuring apparatus that is attached to a measurement site of a living body and measures a biological signal of the living body, and is annular, cylindrical, or those A mounting means that has a partial shape and is mounted on the measurement site; a fixing means that is disposed on the mounting means and moves to the inside of the space formed by the annular shape, the cylindrical shape, or the partial shape; And a detecting means for detecting the biological signal, wherein the fixing means moves while maintaining the positional relationship between the detecting means and the measurement site constant.

  According to the above configuration, by inserting the measurement part of the living body into the space of the attachment means, which is formed by an annular shape, a cylindrical shape, or a partial shape thereof, the attachment means can be attached to the measurement part and the detection is directed toward the inside. Means can be brought into contact with the measurement site. The mounting means can be fixed to the measurement site by moving the fixing means into the space of the mounting means. At this time, the fixing means moves while maintaining the positional relationship between the detection means and the measurement site constant.

  Therefore, even if the mounting state of the mounting unit with respect to the measurement site is adjusted, the environment in which the detection unit detects the biological signal can be kept constant.

  The fixing means includes a center direction moving means that moves in a direction toward the center of the space or the vicinity thereof, and the detection means is arranged on a surface of the center direction moving means facing the center or the vicinity thereof. It is preferable.

  According to said structure, a detection means moves on the straight line which connects the center or its vicinity of the space of a mounting means, and self. Therefore, the mounting state can be adjusted in a state where the angle of the detection unit with respect to the measurement site of the living body inserted in the space of the mounting unit is kept constant, and the detection unit can be brought into close contact with the measurement site. Accordingly, the environment in which the detection means detects the biological signal can be kept constant, and a more preferable detection environment can be realized.

  In addition, the biological signal measuring device includes a plurality of center direction moving means, the detection means is formed of a plurality of functional elements, and the plurality of functional elements are relative to the plurality of functional elements. It is preferable that each of the plurality of central direction moving means is arranged so as to have a predetermined positional relationship, and the plurality of central direction moving units move while maintaining the predetermined positional relationship.

  According to said structure, a some center direction moving means moves, maintaining the relative predetermined positional relationship between several function elements. Therefore, the close contact state of the plurality of functional elements with respect to the living body inserted in the space of the mounting means can be maintained in the same state, and the detection environment of the plurality of functional elements can be kept constant.

  The predetermined positional relationship means, for example, an angle formed by each straight line (optical axis) connecting the measurement site and a plurality of functional elements or a relative positional relationship between the optical axes.

  The biological signal measuring apparatus preferably includes a plurality of the central direction moving means, and the movements of the plurality of central direction moving means are synchronized with each other.

  According to said structure, the movement of a several center direction moving means is mutually synchronized. Here, that the movements are synchronized with each other means that they move at the same timing.

  Therefore, the relative positional relationship between the plurality of center direction moving means can be kept constant, and the positional relationship between the detection means and the measurement site can be kept more constant.

  The biological signal measurement device further includes a mounting state adjusting unit that adjusts a mounting state of the mounting unit with respect to the living body, and the fixing unit is a first clamping unit that faces the line symmetrically across the space. It is preferable that the mounting state adjusting unit adjusts an interval between the first clamping unit and the second clamping unit.

  According to said structure, the mounting state of a mounting means with respect to a biological body can be adjusted because a mounting state adjustment means adjusts the space | interval of a 1st clamping means and a 2nd clamping means. At this time, since the first clamping means and the second clamping means are opposed to each other in line symmetry across the space, the interval is set so as not to change the position of the detection means relative to the living body inserted in the space. It can be narrowed. Therefore, the wearing state can be adjusted while keeping the detection environment of the detection means constant.

  The fixing means further includes a center direction moving means for moving in a direction toward the center of the space or the vicinity thereof, and the detecting means is disposed on a surface of the center direction moving means facing the center. The movement of the center direction moving means is preferably linked to the operation of the first and second clamping means.

  According to said structure, a detection means moves on the straight line which connects the center of the space of a mounting means, and self. Therefore, the mounting state can be adjusted in a state where the angle of the detection unit with respect to the living body inserted into the space of the mounting unit is kept constant, and the detection unit can be brought into close contact with the living body. Furthermore, since the movement of the center direction moving means is linked to the operation of the first and second holding means, the mounting state can be adjusted more strictly so that the angle of the detecting means with respect to the living body does not shift. it can.

  The mounting state adjusting means has a plurality of non-parallel grooves arranged in line symmetry, and moves the first clamping means and the second clamping means using the plurality of grooves as a guide. Is preferred.

  According to the above configuration, the first clamping unit and the second clamping unit are moved by moving the first clamping unit and the second clamping unit along the plurality of line-symmetric grooves formed in the mounting state adjusting unit that are not parallel to each other. The distance between the means and the second clamping means can be easily adjusted.

  The mounting state adjusting means includes a plurality of grooves having a spiral shape or a partial shape thereof arranged symmetrically with respect to a point, and the first clamping means and the second clamping means with the plurality of grooves as a guide. Is preferably moved.

  According to the above configuration, the first clamping means and the second clamping means are moved along a plurality of point-symmetric grooves having a spiral shape or a partial shape formed in the mounting state adjusting means, The interval between the first clamping means and the second clamping means can be easily adjusted.

  The biological signal measuring device detects the intensity of the biological signal detected by the driving means for moving the central direction moving means and the detecting means, and determines the position of the central direction moving means according to the intensity. It is preferable to include control means for outputting a signal for control to the driving means.

  According to said structure, a control means controls the position of a center direction moving means according to the intensity | strength of the biosignal detected by the detection means via a drive means. Therefore, for example, when the strength of the biological signal is low, the strength of the biological signal can be increased by bringing the center direction moving means provided with the detecting means closer to the living body. Conversely, when the intensity of the biological signal is high, the load on the living body can be reduced by moving the center direction moving means away from the living body.

  The mounting means includes a first mounting means and a second mounting means that form the space, and the detection means is disposed on the second mounting means, and the first mounting means and the first mounting means. Preferably, the second mounting means is connected by a belt, and further includes adjusting means for adjusting the length of the belt while maintaining a constant inclination of the second mounting means with respect to the first mounting means.

  According to the above configuration, the adjusting unit adjusts the length of the belt while maintaining the inclination of the second mounting unit with respect to the first mounting unit to adjust the mounting state of the mounting unit.

  Therefore, it becomes easy to adjust the mounting state while maintaining the positional relationship between the detection unit arranged in the second mounting unit and the measurement site constant.

  As described above, the biological signal measuring device according to the present invention has an annular shape, a cylindrical shape, or a partial shape thereof, and is formed by an attachment means that is attached to the measurement site, and the annular shape, the cylindrical shape, or a partial shape thereof. And detecting means for detecting the biological signal, and the mounting means is configured to adjust the mounting state while maintaining the positional relationship between the detecting means and the measurement site constant. .

  As described above, the biological signal measuring device according to the present invention has an annular shape, a cylindrical shape, or a partial shape thereof, and is disposed on the mounting means, and the annular shape, the cylindrical shape, A fixing means that moves to the inside of a space formed by these partial shapes; and a detection means that faces the inside and detects the biological signal. The fixing means is a position between the detection means and the measurement site. It is the structure which moves, maintaining a relationship constant.

  Therefore, even if the mounting state of the mounting means with respect to the measurement site of the living body is adjusted, there is an effect that the environment in which the detecting means detects the biological signal can be kept constant.

[Embodiment 1]
An embodiment of the present invention will be described below with reference to FIGS. Hereinafter, the pulse wave sensor 1 (biological signal measuring device) will be described as an example of the mounting device of the present invention.

(Configuration of pulse wave sensor 1)
FIG. 1A is a front view of the pulse wave sensor 1, and FIG. 1B is a side view of the pulse wave sensor 1. FIG. 2 is a diagram illustrating a state in which the pulse wave sensor 1 is worn on the finger.

  As shown in FIG. 2, the pulse wave sensor 1 is a measuring device attached to a finger. As shown in FIG. 1, the pulse wave sensor 1 includes a mounting portion 2 (mounting means), a measuring portion 7 (detecting means), and a sensor body 8.

(Configuration of mounting part 2)
The mounting unit 2 is a mounting device for mounting the pulse wave sensor 1 to a finger 50 (measurement site of a living body). The mounting unit 2 includes a mounting unit body 3 (mounting unit), a movable unit 4 (fixing unit), a mechanism unit 5 (fixing unit), and a mounting state adjusting unit 6 (mounting state adjusting unit). The mechanism unit 5 is not shown in FIG. 1 because it is disposed inside the mounting unit main body 3.

(Mounting unit body 3)
The mounting portion main body 3 has a substantially cylindrical shape (or an annular shape) having an annular opening 3 a that forms a hole 9 through which the finger 50 passes. As shown in FIG. 1, the opening 3a is provided with four movable parts 4a to 4d. More precisely, the mounting portion main body 3 is a housing that can accommodate the movable portions 4a to 4d.

(Moving part 4)
FIG. 3 is a front view showing the arrangement and moving direction of the movable part 4. In the figure, the mounting state adjustment unit 6, the measurement unit 7, and the sensor body 8 are omitted for simplification. The movable parts 4 a to 4 d are members that are pressed against the finger 50 in order to stably fix the mounting part 2 to the finger 50. These movable portions 4 a to 4 d are arranged at four locations (upper and lower left and right) so as to surround the center 9 a of the hole 9, and can move toward the center 9 a of the hole 9. When the movable parts 4 a to 4 d move toward the center 9 a of the hole 9, the substantial diameter of the opening 3 a is reduced, and the mounting part 2 is stably attached to the finger 50.

  Note that the center 9a of the hole 9 does not need to be the center in an accurate sense, and may be near or inside the center of the hole 9. In other words, the movable parts 4a to 4d may move toward the center of the hole 9 or the vicinity thereof.

  The movable part 4a (fixing means, first clamping means) and the movable part 4b (fixing means, first clamping means) face each other. When the hole 9 is viewed from the front with the sensor body 8 as the upper side, the hole 9 It is arranged on the left and right respectively. Further, the movable part 4c (fixing means, center direction moving means) and the movable part 4d (fixing means, center direction moving means) are opposed to each other, and when the hole 9 is viewed from the front with the sensor body 8 as the upper side, Arranged above and below the hole 9 respectively.

  The movable part 4 a and the movable part 4 b are interlocked with the mechanism part 5, and the positions (movement distances) of the movable parts 4 a and 4 b are adjusted by the mounting state adjusting part 6 via the mechanism part 5. The movable portion 4c and the movable portion 4d are adjusted in the vertical position by the mounting state adjusting portion 6. That is, the movements of the movable parts 4a to 4d are synchronized with each other. The mechanism for adjusting the position of these movable parts 4 will be described later.

  By adjusting the positions of the movable parts 4a to 4d, the diameter of the circle 13 formed by the surface (referred to as an inscribed surface) facing the center 9a of the hole 9 of the movable parts 4a to 4d can be changed. As a result, the mounting state of the mounting unit 2 on the finger 50 can be adjusted.

(Mechanism part 5)
FIG. 4 is a front view showing a part of the configuration of the mechanism unit 5. The mechanism unit 5 is a mechanism for pushing the movable unit 4 in the center direction of the hole 9. As shown in FIG. 4, the mechanism unit 5 includes a bending portion 51 (first holding means) and a bending portion 52 (second holding means) which are a pair of arc-shaped members. The curved portions 51 and 52 are rotatably fixed to the mounting portion main body 3 with the one end portions 51a and 52a facing each other so as to bend outward. With this configuration, the width between the end 51b, which is the other end of the bending portions 51 and 52, and the end 52b is variable. This width is referred to as an adjustment width. This adjustment width changes between an adjustment width 64 and an adjustment width 65 described later.

  Guide pins 53 and 54 are provided on the other ends 51b and 52b of the curved portions 51 and 52, respectively. These guide pins 53 and 54 protrude in a direction toward the outer side of the arc formed by the curved portions 51 and 52, and are inserted into adjustment grooves 61 and 62 of the mounting state adjustment unit 6 described later. With this configuration, the adjustment width is adjusted by the wearing state adjustment unit 6.

  The movable portion 4a is linked to the operation of the bending portion 51, and the movable portion 4b is linked to the operation of the bending portion 52. If the adjustment width is reduced, the distance between the movable portion 4a and the movable portion 4b is also reduced. . That is, if the adjustment width is reduced, the movable portion 4a and the movable portion 4b move in a direction toward the center 9a of the hole 9.

(Mounting state adjusting unit 6 and its operating mechanism)
Fig.5 (a) is a top view which shows the structure of the mounting state adjustment part 6, FIG.5 (b) is the side view. As shown in FIG. 5, the wearing state adjustment unit 6 is a plate-like member, and in the longitudinal direction, in other words, the extension direction of the finger (the direction of the arrow 11 in FIGS. 1 and 2, or the arrow 12 in FIG. 5). The position of the movable part 4 is adjusted by sliding in the direction of

  The wearing state adjustment unit 6 has adjustment grooves 61, 62, and 63 (a plurality of grooves) on the surface thereof. The adjustment groove 61 and the adjustment groove 62 are arranged in line symmetry with an axis parallel to the longitudinal direction of the mounting state adjustment unit 6 as a symmetry axis, and are not parallel to each other. That is, the adjustment groove 61 and the adjustment groove 62 form a square shape with an axis parallel to the longitudinal direction of the mounting state adjustment unit 6 as a central axis.

  The adjustment groove 61 and the adjustment groove 62 may be a groove hole penetrating the mounting state adjustment unit 6 or may be a groove that does not penetrate.

  A guide pin 53 of the bending portion 51 is inserted into the adjustment groove 61, and a guide pin 54 of the bending portion 52 is inserted into the adjustment groove 62. When the mounting state adjusting portion 6 is slid in the longitudinal direction, the width between the adjustment groove 61 and the adjustment groove 62 changes, so that the width between the guide pin 53 and the guide pin 54 changes. The positional relationship between the bending portion 51 and the bending portion 52 changes. And in connection with this, the distance between the movable part 4a and the movable part 4b changes.

  That is, the mounting state adjustment unit 6 has a plurality of grooves (adjustment grooves 61 and 62) that are not parallel to each other, and moves the bending portion 51 and the bending portion 52 using the plurality of grooves as a guide.

  As described above, the adjustment groove 61 and the adjustment groove 62 are arranged symmetrically with respect to an axis parallel to the longitudinal direction of the mounting state adjusting unit 6 as a symmetric axis, and accordingly, according to the slide amount of the mounting state adjusting unit 6. The movable part 4a and the movable part 4b move in plane symmetry with respect to a plane perpendicular to the front surface of the mounting part main body 3 by the same amount, including the center 9a. If the way of viewing is changed, the mounting portion 2 is deformed in plane symmetry in accordance with the slide amount of the mounting state adjusting portion 6.

  More specifically, the width between the adjustment groove 61 and the adjustment groove 62 corresponds to the upper end of the letter C (the starting point of writing) and the end 61a of the adjustment groove 61 and the adjustment groove 62. The end 61a of the adjustment groove 61 and the end of the adjustment groove 62 corresponding to the lower end (point of end of writing) of the letter C The width between the part 62b (adjustment width 65) is the widest. The width between the guide pin 53 and the guide pin 54 is adjusted between the adjustment width 64 and the adjustment width 65.

  The adjustment groove 61 and the adjustment groove 62 may be line-symmetric grooves that are not parallel to each other, and need not be linear grooves. That is, the adjustment groove 61 and the adjustment groove 62 may be curved grooves.

In addition, the guide pin 40 of the movable portion 4 c is inserted into the adjustment groove 63.
FIG. 6 is a diagram for explaining a mechanism for adjusting the position of the movable portion 4c. In the figure, the adjustment grooves 61 and 62 are omitted for the sake of simplicity. As shown in FIG. 6, the adjustment groove 63 is a groove whose bottom is an inclined surface 66 that is inclined along the longitudinal direction of the mounting state adjustment unit 6. That is, the depth of the adjustment groove 63 is not constant, and varies depending on the position of the adjustment groove 63.

  Specifically, the depth of the adjustment groove 63 is the shallowest at the end portion 63a located in the vicinity of the end portions 61a and 62a where the width between the adjustment groove 61 and the adjustment groove 62 is the narrowest. The width with the groove 62 is the deepest at the end 63b located in the vicinity of the ends 61b and 62b.

  The movable portion 4 c includes a guide pin 40 that can be inserted into the adjustment groove 63. When the guide pin 40 is inserted into the adjustment groove 63 and the mounting state adjustment unit 6 is slid, the movable portion 4 c moves up and down with respect to the mounting state adjustment unit 6. That is, when the groove of the adjustment groove 63 becomes shallow, the guide pin 40 is pushed out, and when the groove becomes deep, the guide pin 40 is drawn. If the mounting state adjusting unit 6 is slid by this mechanism, the depth of the adjusting groove 63 changes according to the movement amount, and the movable unit 4c can be moved up and down. And the press-contact state with respect to the finger | toe 50 of the movable part 4c is adjusted by this up-and-down movement.

  The vertical movement of the movable part 4d is controlled by a cam (not shown) provided in the vicinity of the movable part 4d. This cam rotates in conjunction with the operation of the bending portion 51, and the movable portion 4d moves up and down in conjunction with this rotational movement.

  Further, the mounting state adjustment is performed by forming the depth of the adjustment groove 63 and a cam (not shown) so that the movable portion 4c and the movable portion 4d move by the same amount according to the sliding amount of the mounting state adjusting portion 6. The movable portions 4a to 4d move in the same amount symmetrically with respect to an axis that passes through the center 9a and is perpendicular to the front surface of the mounting portion main body 3 in accordance with the sliding amount of the portion 6. If the way of viewing is changed, the mounting portion 2 is deformed to be axially symmetric according to the sliding amount of the mounting state adjusting portion 6.

  Note that it is not always necessary to slide the wearing state adjusting unit 6 in parallel with the extending direction of the finger 50, and the sliding direction of the wearing state adjusting unit 6 is inclined about several degrees with respect to the extending direction of the finger 50. There is no problem. This is because the position can be held by friction between the movable portion 4 and the finger 50.

(Configuration of measuring unit 7)
The measurement unit 7 is an optical transmission sensor that includes a plurality of functional elements including a light emitting element 7a (for example, a light emitting diode (LED)) and a light receiving element 7b (for example, a photodiode (PD)), and a pulse wave ( (Biological signal) is detected. As shown in FIG. 1, the light emitting element 7a and the light receiving element 7b are arranged on the inscribed surface of the movable portion 4d (the surface facing the inside of the hole 9). When the movable portion 4d moves toward the center 9a of the hole 9, the light emitting element 7a and the light receiving element 7b are in close contact with the surface of the finger 50 inserted into the hole 9.

  FIG. 7 is a diagram for explaining a measurement method in the measurement unit 7. When the detection light is irradiated from the light emitting element 7a toward the center 9a of the hole 9, as shown in FIG. 7, the artery of the finger 50 in which a part of the detection light is inserted into the hole 9 (inherent palm side finger artery) At 50a, it is absorbed by hemoglobin in the blood flowing through the artery, the remaining detection light is scattered by the artery, and a part of it is incident on the light receiving element 7b.

  At this time, since the amount of hemoglobin in the artery changes in a wave due to blood pulsation, the amount of detection light absorbed in the hemoglobin also changes in a wave. As a result, the amount of received light that is scattered by the artery and detected by the light receiving element 7b changes. The light receiving element 7b outputs the change in the amount of received light to the sensor body 8 as pulse wave information (for example, a current signal).

  FIG. 7 shows a configuration in which measurement is performed on one of the two arteries 50a, but a configuration in which measurement is performed on both arteries 50a may be employed.

  Moreover, the number of the light emitting elements 7a and the light receiving elements 7b included in the measuring unit 7 is not limited to the above-described one. For example, the measurement unit 7 may be composed of one light emitting element 7a and two light receiving elements 7b. In the case of this configuration, the light emitted from the light emitting element 7a located at the center may be received by the light receiving element 7b with the same path length. In addition, the positional relationship between the elements may be adjusted according to the number of light emitting elements 7a and light receiving elements 7b.

(Configuration of sensor body 8)
The sensor body 8 receives the pulse wave information output from the light receiving element 7b and outputs the measurement result. FIG. 8 is a functional block diagram showing the configuration of the sensor body 8. As shown in the figure, the sensor main body 8 includes a microcomputer 83 (control means) including a drive unit 81, a detection circuit 82, a control unit 84 and a signal processing unit 85, an input unit 86, and a display unit 87. .

  The drive unit 81 irradiates the detection light from the light emitting element 7a according to the command of the control unit 84.

  The detection circuit 82 receives a current signal that is pulse wave information output from the light receiving element 7b, converts the current signal into an analog voltage signal, and outputs the analog voltage signal to the signal processing unit 85.

  The control unit 84 controls each unit of the pulse wave sensor 1, and particularly controls light emission of the light emitting element 7a via the drive unit 81 at a predetermined timing.

  The signal processing unit 85 converts the pulse wave information output from the light receiving element 7b and converted into an analog voltage signal by the detection circuit 82 into digital data by the built-in ADC (AD converter), and performs an operation thereby. Perform wave detection. The signal processing unit 85 outputs the detection result to the display unit 87.

  The input unit 86 is for performing operations such as turning on / off the pulse wave sensor 1 and setting various operation modes, and transmits an instruction (operation content) from the user to the control unit 84.

  FIGS. 9A and 9B show the appearance of the sensor body 8, where FIG. 9A is a plan view, FIG. 9B is a side view, and FIG. 9C is a plan view showing a configuration including a cable lead-out portion 88. (D) is a top view which shows a structure provided with the radio | wireless communication part 90. FIG. In the figure, the mounting state adjustment unit 6 is omitted for the sake of simplicity. As shown in FIGS. 9A and 9B, the input unit 86 is provided on the surface of the sensor body 8, and when the finger 50 is passed through the hole 9, the side surface on the side where the finger 50 is inserted is provided. And on the opposite side surface. The position where the input unit 86 is provided is not limited to the above.

  The display unit 87 displays measurement results and the like, and is provided on the surface of the sensor body 8 as shown in FIG.

  As shown in FIG. 9C, without providing the display unit 87, a cable lead-out unit 88 is provided to collect the wiring from the measurement unit 7 and draw out the cable 89, and the measurement result is transmitted to an external device by the cable 89. It may be output.

  9D, the wireless communication unit 90 may be provided without providing the display unit 87, and the measurement result may be output to an external device by the wireless communication unit 90. With this configuration, a person (for example, a doctor) who is away from a wearer (for example, a patient undergoing home treatment) wearing the pulse wave sensor 1 can acquire the measurement result of the wearer.

(Mounting method of pulse wave sensor 1)
Next, a method for attaching the pulse wave sensor 1 to the finger 50 will be described with reference to FIG. FIG. 10 is a diagram for explaining a mounting method of the pulse wave sensor 1.

  First, the mounting state adjustment unit 6 is slid to adjust the circle 13 (see FIG. 3) to the maximum size. In this state, as shown in FIG. 10, the finger 50 is passed through the mounting portion 2, and the measuring portion 7 is disposed so as to contact the artery of the finger.

  Next, the mounting state adjusting unit 6 is slid in the reverse direction, the movable unit 4 is moved in the center direction of the hole 9, and the size of the circle 13 is reduced, whereby the tightening condition (pressed state and contact state) is adjusted. The pulse wave sensor 1 is attached to the measurement site of the finger while adjusting.

  In this way, the pulse wave sensor 1 can be fixed so as not to be displaced by closely contacting the inscribed surface of the movable portion 4 and the surface of the finger 50 so that no gap is generated.

  In addition, when removing the pulse wave sensor 1, it can remove easily by sliding the mounting state adjustment part 6 again and enlarging the circle | round | yen 13. FIG.

(Operational effect of pulse wave sensor 1)
Next, the effect of the pulse wave sensor 1 will be described with reference to FIG. FIG. 11 is a diagram illustrating the direction of the force generated when the mounting state adjustment unit 6 is slid.

  When the wearing state is adjusted as in the conventional biological signal measuring device, as shown in FIG. 11, the biological signal measuring device rotates in the direction along the outer periphery of the finger 50 (the direction of the arrow 15 or the arrow 16). As a result, there arises a problem that the measurement unit is displaced from the measurement site.

  In such rotation of the biological signal measuring apparatus, the force for adjusting the wearing state is perpendicular to the extending direction of the finger 50 in the outer periphery of the finger 50 and in the tangential direction of the outer periphery (the direction of the arrow 17). It happens by joining.

  As described above, in the pulse wave sensor 1, the mounting state of the mounting unit 2 is adjusted by sliding the mounting state adjusting unit 6. At this time, the wearing state adjusting unit 6 is slid in a direction parallel to the extending direction of the finger 50 (in the direction of the arrow 18). In other words, the wearing state adjustment unit 6 is slid in a direction perpendicular to the surface 19 perpendicular to the extending direction of the finger 50. Therefore, since the force in the direction of rotating the pulse wave sensor 1 does not occur, the possibility that the pulse wave sensor 1 rotates in the direction along the outer periphery of the finger 50 can be reduced. Therefore, the mounting state can be adjusted without shifting the position of the measurement unit 7 from the initial setting position.

  Therefore, it is possible to reduce the possibility of adversely affecting the measurement and the possibility of making the measurement impossible by shifting the position of the measurement unit 7.

  The finger extension direction means a direction from the base of the finger toward the tip of the finger or the opposite direction in a state where the finger is extended.

  Next, the effect of the pulse wave sensor 1 will be described from another viewpoint with reference to FIGS. 12 and 13. 12 and 13 are diagrams showing the positional relationship between the measurement unit and the measurement location of the finger.

  When the pulse wave sensor 1 adjusts the mounting state by operating the mounting state adjusting unit 6, the movable parts 4 a to d which are the inner peripheral surfaces of the mounting unit 2 are moved in the center direction of the inner peripheral surface (the center of the hole 9 9a direction) and adjust. Therefore, the wearing state can be adjusted while maintaining the positional relationship between the measurement unit 7 and the measurement site of the finger 50.

  That is, since the relative positional relationship between the measurement unit 7 (the light emitting element 7a and the light receiving element 7b) and the finger 50 can be adjusted while maintaining a physically ideal state, accurate measurement can be performed. .

  Note that the above-mentioned physically ideal state refers to the position of the measurement unit 7 and a predetermined position of the finger 50 (in FIG. The relative position on the circumference of the inner peripheral surface of the mounting portion 2 is coincident with the measurement site 50b) near the surface layer. When measuring the inside of a living body (for example, an artery), as shown in FIG. 13, the approximate center of the hole 9 between the measuring unit 7 and a predetermined portion of the living body (the artery 50a inside the finger in FIG. 13). The angle from is the same.

  In addition, the mechanism that moves the movable part 4 has an advantage that the moving position can be reproduced, so that the elastic material is used as a belt for wearing, and the measurement is based on the non-uniformity of the elastic rate of the material. The positional deviation of the part 7 can be reduced.

  In order to improve the reproducibility of the movement position, for example, it is preferable that a mark such as a scale is provided on the mounting state adjustment unit 6. According to this configuration, the position of the mounting state adjusting unit 6 with respect to the mounting unit main body 3 can be determined with reference to the mark, and as a result, the mounting state can be quantitatively adjusted and the reproducibility of the mounting state can be improved. Can be increased.

  For this reason, the adjustment is loosened and the circle 13 formed by the movable portion 4 is enlarged, thereby preventing the displacement of the measuring unit 7 in the outer circumferential direction of the finger 50, and the pulse wave sensor 1 falls off the finger 50. Can be prevented.

  When the wearing state adjustment unit 6 is slid in the extending direction of the finger 50, the pulse wave sensor 1 may be shifted in the extending direction of the finger 50. However, if the object to be measured extends along the direction of extension of the finger 50 (for example, the unique palmar finger artery), even if the pulse wave sensor 1 is moved by the operation of the wearing state adjustment unit 6, the measurement is performed. Is less likely to have a major impact on

(Example of change)
In the above configuration, four movable parts 4 are provided, but the number of movable parts 4 may be two, three, or five or more.

  The measurement unit 7 may be provided in the movable unit 4 or may be fixed to the opening 3 a of the mounting unit main body 3. That is, the measurement unit 7 may or may not be moved.

  Alternatively, the mounting state adjustment unit 6 may be provided with a lock mechanism, and the mounting state adjustment unit 6 may be locked to fix the adjustment position. For example, a plate may be provided on the upper part of the mounting state adjustment unit 6, a pad may be disposed there, and the position of the mounting state adjustment unit 6 may be fixed by friction with the mounting state adjustment unit 6. Moreover, it is good also as a structure by which the mounting state adjustment part 6 is not completely locked, but a lock | rock is cancelled | released by the change of the finger shape by the bending of a finger. Any locking mechanism may be used.

  With the above configuration, the adjustment is loosened, the position of the measuring unit 7 in the outer circumferential direction of the finger 50 due to the large circle 13 formed by the movable unit 4 is prevented, and the pulse wave sensor 1 is 50 can be prevented from falling off.

  Further, the mounting portion main body 3 may have a cylindrical shape as described above, or may have a cylindrical shape having a C-shaped shape with a part of a circular arc missing as a cross section, or a cylinder having a polygonal cross section. It may be a shape. In other words, the mounting portion main body 3 may have a cylindrical shape or a part thereof.

  Moreover, the mechanism for moving the movable part 4 is not limited to the above. FIG. 14 is a diagram showing a mechanism for moving the movable portion 4a to the left and right. FIG. 15 is a diagram illustrating a mechanism for moving the movable portion 4c up and down. 16A and 16B are diagrams showing a knob 93 that rotates the helical gear 91, in which FIG. 16A is a side view and FIG. 16B is a front view.

  As shown in FIG. 14 (a), the guide pin 92 of the movable portion 4a (or the movable portion 4b) is disposed in the spiral groove of the gear 91 so that the gear 91 is fitted, as shown in FIG. 14 (b). The movable portion 4a may be moved in the extending direction of the gear 91 by rotating the gear 91.

  Further, as shown in FIG. 15, the movable portion 4 c (or the movable portion 4 d) may be moved up and down by directing the gear 91 in the center direction of the hole 9 (the direction of the arrow 94).

  As a mechanism for rotating the gear 91, a knob 93 connected to the gear 91 may be provided in the mounting portion 2 as shown in FIG. By rotating the knob 93, the movable part 4 can be moved left and right or up and down.

  Also in the above configuration, the mounting state of the mounting unit 2 can be adjusted so that a force for rotating the mounting unit 2 on the outer periphery of the finger 50 is not generated. The force generated by rotating the knob 93 is substantially the same as the force generated when the mounting state adjusting unit 20 of the pulse wave sensor 10 described later is rotated.

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. In addition, about the member similar to Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 17 shows the appearance of the pulse wave sensor 10 (biological signal measuring device) of this embodiment, (a) is a perspective view, and (b) is a plan view. The pulse wave sensor 10 includes movable parts 4a to 4d, a measurement part 7, and a sensor body 8 as in the pulse wave sensor 1, but these members are omitted in FIG. Yes. As shown in FIGS. 17A and 17B, unlike the pulse wave sensor 1, the pulse wave sensor 10 includes an attachment state adjustment unit 20 (attachment state adjustment means). The mounting state adjustment unit 20 has a knob shape, and the mounting state of the mounting unit 2 can be adjusted by turning the knob.

  FIGS. 18A and 18B show the shape of the mounting state adjustment unit 20, where FIG. 18A is a bottom view, FIG. 18B is a side view, and FIG. 18C is a front view. As shown in FIG. 5A, an adjustment groove 21, an adjustment groove 22, and an adjustment groove 26 are formed on the bottom surface of the mounting state adjustment unit 20. The adjustment groove 21 and the adjustment groove 22 are substantially semicircular grooves facing each other, and are formed point-symmetrically with the center of rotation 23 of the mounting state adjustment unit 20 as the center of symmetry. In other words, the adjustment groove 21 and the adjustment groove 22 are part of a spiral shape having the center 23 as the center of the vortex.

  A guide pin 53 (see FIG. 4) of the bending portion 51 is inserted into the adjustment groove 21, and a guide pin 54 of the bending portion 52 is inserted into the adjustment groove 22. When the mounting state adjustment unit 20 is rotated about the center 23 as a rotation axis, the adjustment width between the guide pin 53 and the guide pin 54 changes as the widths of the adjustment groove 21 and the adjustment groove 22 change.

  That is, the mounting state adjusting unit 20 has a plurality of grooves (adjustment grooves 21 and adjustment grooves 22) having a spiral shape or a part of the spiral shape, and the bending portions 51 and 52 are guided by the plurality of grooves. Move.

  As described above, the adjustment groove 21 and the adjustment groove 22 are formed point-symmetrically with the center 23 as the center of symmetry, so that the movable portion 4a and the movable portion 4b are in accordance with the amount of rotation of the mounting state adjustment portion 20. The plane moves in a plane-symmetric manner by the same amount with respect to a plane that includes the center 9a and is perpendicular to the front surface of the mounting portion main body 3. If the way of viewing is changed, the mounting portion 2 is deformed in a plane symmetry according to the amount of rotation of the mounting state adjusting portion 20.

  The width of the adjustment groove 21 and the adjustment groove 22 is the narrowest adjustment width 24, which is the width between the end 21 a and the end 22 a, which is the end of the adjustment groove closer to the center 23. The adjustment width 25, which is the width between the end portion 21b and the end portion 22b, which is the end portion of the adjustment groove, which is the farthest, is the widest.

  That is, the width of the adjustment groove 21 and the adjustment groove 22 increases or decreases between the adjustment width 24 and the adjustment width 25 depending on the rotation angle of the mounting state adjustment unit 20. Therefore, the adjustment width of the bending parts 51 and 52 can be uniquely determined according to the rotation angle of the mounting state adjustment part 20, and the distance between the movable part 4a and the movable part 4b can be adjusted.

  The adjustment groove 26 is a circular groove with the center 23 as the center. The adjustment groove 26 has a different depth at each position of the groove, and is a groove whose bottom is an inclined surface that is inclined along the circumferential direction.

  A guide pin 40 of the movable portion 4 c is inserted into the adjustment groove 26, and the guide pin 40 contacts the bottom of the adjustment groove 26. When the mounting state adjustment unit 20 is rotated in this state, the depth of the adjustment groove 26 changes. When the adjustment groove 26 becomes shallow, the guide pin 40 is pushed out, and when the adjustment groove 26 becomes deep, the guide pin 40 is drawn. . That is, if the mounting state adjusting unit 6 is rotated without rotating the movable part 4c, the depth of the adjustment groove 26 changes according to the rotation angle, and the movable part 4c can be moved up and down.

  That is, the movements of the movable parts 4 a to 4 d are synchronized with each other, and the movement is accompanied by the rotation of the mounting state adjusting part 20.

(Operational effect of pulse wave sensor 10)
Next, the effect of the pulse wave sensor 10 will be described with reference to FIG. FIG. 19 is a diagram illustrating the direction of the force generated when the mounting state adjusting unit 20 is rotated.

  As described above, the force for adjusting the wearing state is applied to the outer circumference of the biological signal measuring device in a direction perpendicular to the finger extension direction and in the tangential direction of the outer circumference (direction of arrow 17). The signal measurement device is likely to rotate around the finger.

  On the other hand, in the pulse wave sensor 10, the mounting state of the mounting unit 2 is adjusted by rotating the mounting state adjusting unit 20. As shown in FIG. 19, the rotation of the wearing state adjustment unit 20 has a straight line (a straight line including the arrow 27) passing through the center 9 a of the hole 9 as a rotation axis, so that the pulse wave sensor 10 is moved around the finger. The force in the direction of rotation does not work.

  Therefore, it is possible to reduce the possibility that the pulse wave sensor 1 rotates in the direction along the outer periphery of the finger when adjusting the wearing state, and the wearing state can be adjusted without shifting the position of the measurement unit 7 from the initial setting position.

(Example of change)
FIG. 20 is a perspective view showing a modified example of the mounting state adjustment unit 20. FIGS. 21A and 21B show another modified example of the mounting state adjusting unit 20, in which FIG. 21A is a perspective view and FIG. 21B is a plan view. FIGS. 22A and 22B show still another modified example of the mounting state adjusting unit 20, in which FIG. 22A is a perspective view and FIG. 22B is a plan view.

  The shape of the mounting state adjusting unit 20 is not limited to the knob shape, and as shown in FIGS. 20 and 21, the mounting state adjusting unit 20a (mounting state adjusting means) or the mounting state adjusting unit 20b is a flat cylindrical shape. (Wearing state adjusting means) may be used. By making the mounting state adjustment part cylindrical, the distance from the outer peripheral part of the mounting state adjustment part to the central axis becomes constant, so if a uniform force is applied to the outer peripheral part, the displacement due to rotation at the central axis part There is an effect that disappears.

  Furthermore, the mounting state adjustment unit 20b has a larger diameter than the mounting state adjustment unit 20a. Therefore, since the mounting state adjusting unit 20b is configured to be operable at the outer peripheral portion that can have a large diameter, a large moment can be easily obtained, and the mounting state can be adjusted with a small operating force. Further, since the operation amount is large, fine adjustment is facilitated.

  Further, as shown in FIG. 21, the mounting state adjusting unit 20b may be integrated with the sensor main body 8, or may not be integrated with the sensor main body 8 as shown in FIG. However, it is preferable to integrate the mounting state adjusting unit 20b with the sensor body 8. With this configuration, the thickness of the pulse wave sensor 10 can be reduced, the distance from the center of the hole 9 to the mounting state adjustment unit 20b can be reduced, and the possibility of the position of the measurement unit 7 being shifted can be further reduced. it can. Moreover, since it is the structure which can take the largest diameter in the mounting part 2 and it can be operated in the outer periphery of the mounting part 2, the space inside and the lower side of the mounting state adjustment part 20b can be used effectively.

[Embodiment 3]
Another embodiment of the present invention will be described below with reference to FIG. In addition, about the member similar to the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 23 is a cross-sectional view showing the configuration of the pulse wave sensor 30 (biological signal measuring device) of the present embodiment. FIG. 23A shows a state in which the distance between the guide pin 33b and the guide pin 34b is maximized. (B) is sectional drawing which shows the state from which the distance between the guide pin 33b and the guide pin 34b is the minimum. As shown in the figure, unlike the pulse wave sensor 1 and the pulse wave sensor 10, the pulse wave sensor 30 includes movable parts 31, 32, 35, and 36 and curved parts 33 and 34. That is, the arrangement of the movable part and the mechanism for adjusting the position of the movable part are different from the above-described embodiment.

(Driving mechanism for movable parts 31 and 32)
The movable part 31 (fixing means, first clamping means) is integrally formed with the bending part 33 (fixing means, first clamping means), and one end 33a of the bending part 33 rotates to the mounting part main body 3. It is fixed as possible. A guide pin 33 b is disposed at the other end of the bending portion 33, and this guide pin 33 b is inserted into the adjustment groove 21 of the mounting state adjustment unit 20.

  Further, a movable part 32 (fixing means, second clamping means) and a bending part 34 (fixing means, second clamping means) are arranged on the side facing the movable part 31 and the bending part 33 across the hole 9. . The movable portion 32 is integrally formed with the bending portion 34, and one end 34 a of the bending portion 34 is fixed to the mounting portion main body 3 so as to be rotatable. A guide pin 34 b is disposed at the other end of the bending portion 34, and the guide pin 34 b is inserted into the adjustment groove 22 of the mounting state adjustment unit 20.

  As described above, the width between the guide pin 33b and the guide pin 34b can be changed by rotating the mounting state adjusting unit 20, and if the width between the guide pin 33b and the guide pin 34b becomes narrower. The movable part 31 and the movable part 32 are pushed out toward the center of the hole 9, and the distance between the movable part 31 and the movable part 32 is reduced. That is, the movable part 31 and the movable part 32 move in the direction in which the finger is tightened.

(Driving mechanism for movable parts 35 and 36)
The movable parts 35 and 36 (fixing means, center direction moving means) are located below the ends 33a and 34a of the bending parts 33 and 34 (on the side away from the mounting state adjusting part 20), and the central axis of the pulse wave sensor 30 Are arranged symmetrically with respect to each other about the axis of symmetry. These movable portions 35 and 36 are subjected to a load acting in the outer peripheral direction of the mounting portion 2 by a spring 39. That is, the movable portions 35 and 36 are applied by the spring 39 in the direction away from the center 9 a of the hole 9 by the spring 39.

  Elliptical cams 37 and 38 are disposed at positions that are in contact with the movable portions 35 and 36 and are further away from the center 9a than the movable portions 35 and 36, respectively. If the long axes of the cams 37 and 38 are directed toward the center 9a, the movable portions 35 and 36 are pushed out toward the center 9a. Otherwise, the movable portions 35 and 36 are pulled away from the center 9a. It is.

  The cams 37 and 38 are rotatably arranged on the mounting portion main body 3, and the rotation of the cams 37 and 38 is interlocked with the rotation of the bending portions 33 and 34.

  Specifically, the bending portion 33 is connected to the cam 37 via the connecting member 41, and the cam 37 rotates as the bending portion 33 rotates. The connecting member 41 can be displaced along a guide 43 arranged on the mounting portion main body 3.

  Similarly, the bending portion 34 is connected to the cam 38 via the connecting member 42, and the cam 38 rotates as the bending portion 34 rotates.

  The drive mechanism of the movable parts 35 and 36 is summarized as follows. That is, the movable parts 35 and 36 are always pressed against the cams 37 and 38 by the spring 39. If the width between the guide pin 33b and the guide pin 34b included in the bending portions 33 and 34 is reduced by the rotation of the mounting state adjusting portion 20, the cams 37 and 34 are interlocked with the rotation of the bending portions 33 and 34. 38 rotates, and the long axis of the cams 37 and 38 faces the direction of the center 9a. As a result, the movable parts 35 and 36 are pushed out in the direction toward the center 9a.

  In other words, the movements of the bending portions 33 and 34 and the movable portions 35 and 36 are synchronized, and the movement is accompanied by the rotation of the mounting state adjustment unit 20.

  The cams 37 and 38 have symmetrical and identical shapes, and rotate by the same amount in accordance with the rotation amount of the mounting state adjustment unit 20, so that the movable portion 35 is in accordance with the rotation amount of the mounting state adjustment unit 20. The movable portion 36 is a plane including the center 9a and moves by the same amount symmetrically with respect to a plane perpendicular to the front surface of the mounting portion main body 3. If the way of viewing is changed, the mounting portion 2 is deformed in a plane symmetry according to the amount of rotation of the mounting state adjusting portion 20.

  A light emitting element 7 a is disposed on the inscribed surface of the movable portion 35, and a light receiving element 7 b is disposed on the inscribed surface of the movable portion 36. Therefore, when the movable portions 35 and 36 are pushed out toward the center 9 a of the hole 9, the light emitting element 7 a and the light receiving element 7 b are pressed against the surface of the finger inserted into the hole 9. Note that the light emitting element 7a and the light receiving element 7b may be provided on either side of the movable part 35 or the movable part 36.

  The light emitting direction of the light emitting element 7a and the light receiving direction of the light receiving element 7b are respectively directed to the center 9a of the hole 9, and the light emitting direction and the light receiving direction intersect with each other at an angle θ.

  That is, the light emitting element 7a and the light receiving element 7b, which are a plurality of functional elements, are arranged in different movable parts (movable parts 35 or 36) so as to have a predetermined relative positional relationship with each other.

(Effect of pulse wave sensor 30)
As described above, in the pulse wave sensor 30, when adjusting the mounting state of the mounting part 2, the light emitting element 7a and the light receiving element 7b respectively provided in the movable part 35 or the movable part 36 have the angle θ described above. While maintaining the position, the hole 9 moves toward the center 9a or away from the center 9a. In other words, the movable portions 35 and 36 in which the light emitting element 7a or the light receiving element 7b are arranged move while maintaining a predetermined positional relationship (angle θ).

  That is, in addition to the relative positional relationship between the measurement unit 7 (light emitting element 7a and light receiving element 7b) and the measurement target (finger 50), the relative positional relationship (angle or light) between the light emitting element 7a and the light receiving element 7b. The mounting state can be adjusted while maintaining the shaft in a physically ideal state. Therefore, more accurate measurement is possible.

(Example of change)
In the above-described configuration, the pulse wave sensor 30 includes the mounting state adjustment unit 20, but may include the mounting state adjustment unit 6, or may include the mounting state adjustment unit 20a or 20b.

[Embodiment 4]
Another embodiment of the present invention will be described below with reference to FIG. In addition, about the member similar to the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

(Configuration of pulse wave sensor 70)
FIG. 24 is a cross-sectional view showing a configuration of the pulse wave sensor 70 (biological signal measuring device) of the present embodiment, (a) is a cross-sectional view showing a state where the actuator is contracted, and (b) is an actuator. It is sectional drawing which shows the state which is extended | stretched.

  As shown in the figure, the pulse wave sensor 70 includes movable portions 71a to 71d (fixed means, central direction moving means) that are moved by an actuator 72 (driving means). The positional relationship between these movable parts 71a to 71d is the same as that of the movable parts 4a to 4d.

  The actuator 72 performs an expansion / contraction operation, for example, an artificial muscle such as “BioMetal” (BioMetal: a registered trademark of Toki Corporation), which is a fibrous actuator made of a Ti—Ni shape memory alloy as a raw material. System actuators can be used. Such an artificial muscle type actuator is considered to be preferable in terms of miniaturization at present, but a mechanical type actuator such as a micro actuator using MEMS (Micro Electro Mechanical System) technology may be used.

  A spring 73 is provided between the movable portions 71 a to 71 d and the mounting portion main body 3. Due to the spring 73, the movable portions 71a to 71d are subjected to a load that acts in the inner circumferential direction of the mounting portion main body 3, and the mounting portions are moved along with the expansion and contraction of the actuator 72 on the outer peripheral side of the movable portions 71a to 71d. The main body 3 is configured to reciprocate in the inner circumferential direction or the outer circumferential direction. When the actuator 72 extends (more precisely, does not contract), the movable portions 71a to 71d are pushed out toward the center of the hole 9 (inside the inner peripheral surface of the mounting portion main body 3) by the spring 73. More specifically, the movable parts 71a to 71d move on a straight line connecting the center 9a of the hole 9 and itself.

  Further, by making the moving amounts of the movable portions 71a to 71d equal to each other, the mounting portion 2 is symmetric about an axis that passes through the center 9a and is perpendicular to the front surface of the mounting portion main body 3. Will be deformed.

  A mounting state adjusting unit 74 (mounting state adjusting means) for operating the expansion / contraction operation of the actuator 72 is a switch for turning on / off the energization of the actuator 72. As described with reference to the above-described embodiment, in this embodiment, the rotary mounting state adjustment unit 74 is used so that the mounting unit 2 can be operated in a direction in which it is difficult to generate a circumferential rotational force.

  By rotating (turning on) the mounting state adjustment unit 74 in the clockwise direction, the actuator 72 is energized and contracts to the shortest state, and the movable units 71a to 71d provided on the inner peripheral surface side of the mounting unit body 3 are It is set at the outermost position. In other words, the inner peripheral diameter of the hole 9 is maximized.

  By rotating (turning off) the mounting state adjustment unit 74 in the counterclockwise direction, the actuator 72 is cut off and released from the contracted state. As a result, since the actuator 72 is in a flexible state in which the actuator 72 can be extended, the movable portions 71 a to 71 d are pushed out to the inner peripheral side by the action of the spring 73 and are pressed against the finger 50. In other words, the inner peripheral diameter of the hole 9 is in a minimum state.

  That is, the movements of the movable parts 71 a to 71 d are synchronized, and the movement is accompanied by the rotation of the mounting state adjusting part 74.

  A light receiving element 7b is disposed on the surface of the movable portions 71a and 71b facing the center 9a of the hole 9 (the surface facing the inner peripheral surface of the mounting portion main body 3). A light emitting element 7a is arranged on the surface of the movable portion 71d facing the center 9a of the hole 9.

  The detection light emitted from the light emitting element 7a is diffused on the surface of the finger inserted into the hole 9, and enters the two light receiving elements 7b.

  The straight line (optical axis) connecting the movable part 71a (or the light receiving element 7b) and the center 9a and the straight line (optical axis) connecting the movable part 71b (or the light receiving element 7b) and the center 9a are the movable part 71d (or light emitting element). 7a) and the straight line (optical axis) connecting the center 9a form an angle θ ′. Since the movable parts 71a to 71d move on a straight line connecting the center 9a of the hole 9 and itself, the angle θ 'is maintained even if the movable parts 71a to 71d move. In the present embodiment, the angle θ ′ is 90 °.

(Effect of pulse wave sensor 70)
In the pulse wave sensor 70, the light emitting element 7a and the light receiving element 7b, which are provided in the movable parts 71a and 71b or the movable part 71c, respectively, and function as the measurement part 7, maintain the angle θ ′. It moves to the inner peripheral direction or outer peripheral direction of the hole 9 which the mounting part main body 3 has as it is.

  In other words, the light emitting element 7a and the light receiving element 7b, which are a plurality of functional elements, are arranged in different movable parts (movable parts 71a, 71b or 71d) so as to have a predetermined relative positional relationship with each other. Thus, the movable parts 71a, 71b and 71d move while maintaining a predetermined positional relationship (angle θ).

  Therefore, even when the mounting state of the mounting unit 2 is adjusted, the angles of the light emitting element 7a and the light receiving element 7b with respect to the finger 50 can be maintained constant, and the pulse wave detection environment can be maintained constant.

  That is, in addition to the relative positional relationship between the light emitting element 7a and the light receiving element 7b and the measurement target (finger 50), the relative positional relationship (angle or optical axis) between the light emitting element 7a and the light receiving element 7b is also included. Since the wearing state can be adjusted while maintaining a physically ideal state, more accurate measurement is possible.

(Example of change)
In the present embodiment, when the mounting portion main body 3 is viewed from the front, the light emitting element is arranged on the lower side and the light receiving elements are arranged on both the left and right sides. For example, the light emitting element 7a and the light receiving element 7b You may arrange | position so that it may mutually oppose on either right and left or up and down. In this case, a straight line connecting the light emitting element 7a and the light receiving element 7b passes through the center 9a of the hole 9, and the movable portion 71 provided with the light emitting element 7a or the light receiving element 7b moves on the straight line. Therefore, the angle θ ′ is 180 °, and the mounting state of the mounting portion 2 can be adjusted in a state where the angle θ ′ is maintained.

  The angle θ ′ is not limited to 90 ° and 180 °, and may be any number of times.

  Although an example of an actuator that contracts when energized is shown as a mechanism for moving the movable portion 71, an actuator that can be driven in both directions of expansion and contraction (for example, an artificial muscle actuator such as a conductive polymer actuator) is used. Also good.

  In this case, when the microcomputer 83 of the sensor body 8 determines that the amplitude of the measured pulse wave is small, the microcomputer 83 controls the mounting state of the mounting unit 2 so that the measuring unit 7 is the object to be measured. It may be automatically controlled so that the amplitude of the pulse wave is increased by pressing the finger more strongly.

  On the other hand, when the amplitude of the pulse wave is sufficiently large, the finger pressing of the measuring unit 7 is loosened (the measuring unit 7 is moved in the outer circumferential direction) within a range where the amplitude of the pulse wave does not decrease more than necessary. By controlling, the burden on the finger due to the pressing of the measuring unit 7 may be reduced. That is, feedback control as described above is also possible.

  In addition to automatically performing the feedback control as described above, when it is determined that the amplitude of the pulse wave measured by the microcomputer 83 is small, a message, a mark, or the like is displayed on the display unit 87 of the sensor body 8. If the user wearing the pulse wave sensor 70 is notified, correct measurement can be performed by the user adjusting the wearing state.

[Embodiment 5]
Another embodiment of the present invention will be described below with reference to FIG. In addition, about the member similar to the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 25 is a cross-sectional view showing the configuration of the pulse wave sensor 100 (biological signal measurement device) of the present embodiment.

  Each of the above-described embodiments is a mechanism for tightening a finger from at least two directions such as the vertical direction and the horizontal direction. However, as shown in FIG. The adjustment means) is rotated, the screw 96 is rotationally driven, and the movable portion 97 (mounting means) is moved to tighten it from one direction.

  The light emitting element 7a and the light receiving element 7b are arranged inside the bending portion 98 (mounting means) (on the side facing the movable portion 97). By rotating the mounting state adjustment unit 95, the movable unit 97 moves in a direction approaching the bending unit 98, and the distance between the movable unit 97 and the bending unit 98 is shortened, so that the movable unit 97 and the bending unit 98 are reduced. The light emitting element 7a and the light receiving element 7b are in close contact with the finger inserted between the two.

  Also in the pulse wave sensor 100, when adjusting the mounting state, the light emitting element 7a and the light receiving element 7b arranged on the inner peripheral surface of the bending portion 98 face the center direction of the inner peripheral surface (the center direction of the hole 9). Thus, the structure is pressed against the finger to be measured. Therefore, it is possible to adjust the wearing state while maintaining the positional relationship (angle) between the light emitting element 7a and the light receiving element 7b and the finger.

  That is, the movable part 97 adjusts the wearing state while maintaining the positional relationship between the measuring part 7 and the finger 50 constant.

[Embodiment 6]
Another embodiment of the present invention will be described below with reference to FIG. In addition, about the member similar to the above-mentioned embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 26 is a perspective view showing the configuration of the pulse wave sensor 110 (biological signal measurement device) of the present embodiment. The pulse wave sensor 110 includes a mechanism that winds both ends of the belt-like belt 114 by the same amount. Specifically, as shown in FIG. 26, the pulse wave sensor 110 includes a mounting state adjusting unit 111 (mounting state adjusting unit), a winding mechanism unit 112 (adjusting unit), a movable unit 113 (second mounting unit), A mounting portion main body 115 (first mounting means) is provided.

  The mounting state adjustment unit 111 controls the rotation of the winding mechanism unit 112. By rotating the mounting state adjustment unit 111, the rotation of the winding mechanism unit 112 is turned on / off. The mounting state adjustment unit 111 may be a switch for controlling the winding mechanism unit 112, and the shape and operation direction of the mounting state adjustment unit 111 are not limited to those described above.

  Two winding mechanism sections 112 are arranged inside the mounting section main body 115 and wind up each end of the belt 114. Since the rotation of each winding mechanism 112 is synchronized, each winding mechanism 112 winds the belt 114 by the same amount at the same time.

  The mounting portion main body 115 has a side surface 116 that forms a part of an arc, and a finger can be brought into contact with the side surface 116. A mounting state adjusting unit 111 is disposed above the mounting unit main body 115, and a movable unit 113 is disposed below.

  The movable portion 113 has a side surface 117 that forms a part of an arc. By combining the side surface 117 and the side surface 116 of the mounting portion main body 115, an annular (or tubular) shape for inserting a finger is provided. The structure is formed.

  The movable portion 113 is provided to be displaceable with respect to the mounting portion main body 115, and the relative position with respect to the mounting portion main body 115 can be adjusted by the belt 114. That is, the belt 114 passes through the movable portion 113, and when the winding mechanism portion 112 winds the belt 114, the movable portion 113 moves in a direction approaching the mounting portion main body 115. As a result, the size of the hole 9 formed by the mounting portion main body 115 and the movable portion 113 is reduced. Thereby, the mounting state of the pulse wave sensor 110 is adjusted.

  The belt 114 may be a single belt that penetrates from one end of the movable portion 113 to the other end, and is connected to one end and the other end of the movable portion 113, respectively. Two belts may be used.

  Further, the light emitting element 7a and the light receiving element 7b are provided on the side surface 117 of the movable part 113, and the light emitting element 7a and the light receiving element 7b are moved by moving the movable part 113 in a direction approaching the mounting part main body 115. It is pressed against the finger inserted into the hole 9.

  As described above, the pulse wave sensor 110 includes the mounting portion main body 115 and the movable portion 113, and the hole 9 is formed by the mounting portion main body 115 and the movable portion 113. The measuring unit 7 (light emitting element 7a and light receiving element 7b) is arranged in the movable unit 113. The mounting portion main body 115 and the movable portion 113 are connected by a belt, and each winding mechanism portion 112 winds the belt 114 simultaneously by the same amount. In other words, the winding mechanism unit 112 adjusts the length of the belt 114 while maintaining the inclination of the movable unit 113 with respect to the mounting unit main body 115 constant.

  Therefore, it is possible to adjust the wearing state of the pulse wave sensor 110 while maintaining the positional relationship (angle) between the measurement unit 7 and the finger constant.

  The movable portion 113 is preferably close to the mounting portion main body 115 while maintaining a state parallel to the mounting portion main body 115.

  In the above description, the winding mechanism 112 has been described as winding the belt 114. However, by rotating the winding mechanism 112 in a direction opposite to the direction in which the belt 114 is wound, A configuration may be provided in which the length of 114 is increased. In this case, the two winding mechanism sections 112 simultaneously feed the belt 114 by the same amount.

  Further, the two ends of the belt 114 may be connected to one winding mechanism unit 112, and the winding mechanism unit 112 may be rotated to simultaneously wind both ends of the belt 114.

(Example of change)
In addition to the tightening mechanism described above, a structure such as a mechanism for injecting a liquid or gas into a bag-like container such as a cuff to perform overall tightening adjustment can be applied to the present invention.

  The above mechanism adjusts the wearing state while maintaining the positional relationship between the measurement unit and the finger constant, and deforms the cuff symmetrically with the finger as the center of symmetry.

  In addition, about the movement amount of the above-mentioned movable part 4a-d, 35, 36, if each movement is the same amount, it has the effect that the relative position of the measurement part 7 with respect to a finger is maintained as a whole. Strictly speaking, it is effective even if the movable part operates symmetrically around a measurement target such as an artery site or the movable part is displaced at a predetermined ratio.

  That is, in the pulse wave sensor of the present invention, the light emitting element 7a and the light receiving element 7b are directed toward the center of the hole 9 of the mounting portion body 3 when adjusting the mounting state of the pulse wave sensor on the finger to be measured. Any device having an attachment state adjustment mechanism that can adjust the attachment state so as to be in close contact with the finger.

  In the above-described configuration, an optical sensor is shown as the measurement unit 7. However, the measurement unit 7 may be, for example, an electrode for measuring electrocardiogram, myoelectricity, or skin resistance, an ultrasonic sensor, temperature or moisture. Various types of sensors for measuring biological information, such as a sensor to detect and a sensor to detect sound such as arterial sound, may be used.

  The above configuration is effective when the measurement environment changes depending on the position of the measurement target, but the measurement target is along a certain direction (the direction of the finger) like the intrinsic artery in the above embodiment. In some cases, it is particularly effective.

  In the above configuration, the measurement target of the pulse wave sensor is a finger, but the measurement target of the pulse wave sensor may be a wrist, an arm, a leg, a neck, or a torso. The measurement object is not limited to the human body, and may be a living organism other than human.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can also be expressed as follows.

  The biological signal measuring device of the present invention is a biological signal measuring device that is mounted on a living body and measures a biological signal, and is mounted on a cylindrical part such as an extremity or a finger in an annular shape or an arc shape; A measurement unit that measures a biological signal in close contact with a predetermined part of the living body, and a mounting state adjustment mechanism unit that adjusts a mounting state of the mounting unit, and the mounting state adjustment mechanism unit includes the measurement The predetermined positional relationship between the part and the predetermined part of the living body is adjusted to be kept substantially constant.

  In the biological signal measuring apparatus, it is preferable that the predetermined positional relationship is a relative positional relationship on the circumference of the inner peripheral surface of the mounting portion between the position of the measuring unit and the predetermined portion of the living body.

  In the biological signal measuring device, it is preferable that the predetermined positional relationship is an angular relationship between the measurement unit and a predetermined portion of the biological body from a substantial center of the mounting unit.

  In the biological signal measuring apparatus, the measurement unit includes at least two or more functional elements, and the functional elements are arranged in the mounting unit with a predetermined relative positional relationship with each other, and the mounting It is preferable that the state adjustment mechanism adjusts the predetermined relative positional relationship of the functional elements while maintaining the constant relative relationship.

  Since the wearing state can be adjusted without shifting the sensor, it can be used as a biological signal measuring apparatus in which it is important to maintain the position of the sensor.

The structure of the pulse wave sensor of one Embodiment is shown, (a) is a front view, (b) is a side view. It is a figure which shows the state which mounted | wore the finger | toe with the pulse wave sensor of one Embodiment. It is a front view which shows arrangement | positioning and the moving direction of a movable part with which the pulse wave sensor of one Embodiment is provided. It is a front view which shows the structure of the mechanism part with which the pulse wave sensor of one Embodiment is provided. The structure of the mounting state adjustment part with which the pulse wave sensor of one Embodiment is provided is shown, (a) is a top view, (b) is a side view. It is a figure for demonstrating the mechanism of the position adjustment of the said movable part. It is a figure for demonstrating the measuring method in the measurement part with which the pulse wave sensor of one Embodiment is provided. It is a functional block diagram which shows the structure of the sensor main body with which the pulse wave sensor of one Embodiment is provided. The external appearance of the said sensor main body is shown, (a) is a top view which shows the structure provided with a display part, (b) is the side view, (c) is a plane which shows the structure provided with a cable extraction part. It is a figure and (d) is a top view which shows a structure provided with a radio | wireless communication part. It is a figure for demonstrating the mounting method of the pulse wave sensor of one Embodiment. It is a figure which shows the direction of the force produced when sliding the said mounting state adjustment part. It is a figure which shows the positional relationship of the said measurement part and the measurement location of a finger | toe. It is a figure which shows the positional relationship of the said measurement part and the measurement location of a finger | toe. It is a figure which shows the mechanism which moves the said movable part to right and left. It is a figure which shows the mechanism which moves the said movable part up and down. The knob which rotates a helical gear is shown, (a) is a side view, (b) is a front view. The external appearance of the pulse wave sensor of another embodiment is shown, (a) is a perspective view, (b) is a top view. The shape of the mounting state adjustment part with which the pulse wave sensor of another embodiment is provided is shown, (a) is a bottom view, (b) is a side view, (c) is a front view. It is a figure which shows the direction of the force produced when rotating the said mounting state adjustment part. It is a perspective view which shows the modification of the said mounting state adjustment part. The other modified example of the said mounting state adjustment part is shown, (a) is a perspective view, (b) is a top view. FIG. 8 shows still another modified example of the mounting state adjusting unit, where (a) is a perspective view and (b) is a plan view. The structure of the pulse wave sensor of another embodiment is shown, (a) is a sectional view showing the state where the distance between guide pins is the maximum, (b) is between guide pins. It is sectional drawing which shows the state where distance is the minimum. FIG. 3 shows a configuration of a pulse wave sensor according to another embodiment, wherein (a) is a cross-sectional view showing a state where the actuator is contracted, and (b) is a cross-sectional view showing a state where the actuator is extended. It is. It is sectional drawing which shows the structure of the pulse wave sensor of another embodiment. It is a perspective view which shows the structure of the pulse wave sensor of another embodiment.

Explanation of symbols

1 Pulse wave sensor (biological signal measuring device)
2 Wearing part (wearing means)
3 Mounting body (mounting means)
4a Movable part (fixing means, first clamping means)
4b Movable part (fixing means, second clamping means)
4c Movable part (fixing means, center direction moving means)
4d Movable part (fixing means, center direction moving means)
5 Mechanism (fixing means)
6 Wearing state adjustment unit (wearing state adjusting means)
7 Measuring part (detection means)
7a Light emitting element (detection means)
7b Light receiving element (detection means)
10 Pulse wave sensor (Biological signal measuring device)
20 Wearing state adjusting unit (wearing state adjusting means)
20a Wearing state adjusting unit (wearing state adjusting means)
20b Wearing state adjusting unit (wearing state adjusting means)
30 Pulse wave sensor (biological signal measuring device)
31 Movable part (fixing means, first clamping means)
32 Movable part (fixing means, second clamping means)
33 Curved part (fixing means, first clamping means)
34 Bending part (fixing means, second clamping means)
35 Movable parts (fixing means, center direction moving means)
36 Movable part (fixing means, center direction moving means)
50 fingers (measurement part of a living body)
51 curved portion (fixing means, first clamping means)
52 curved portion (fixing means, second clamping means)
61 Adjustment groove 62 (multiple grooves)
62 Adjustment groove 62 (multiple grooves)
70 Pulse wave sensor ((Biological signal measuring device)
71a Movable part (fixing means, center direction moving means)
71b Movable part (fixing means, center direction moving means)
71c Movable part (fixing means, center direction moving means)
71d Movable part (fixing means, center direction moving means)
72 Actuator (drive means)
83 Microcomputer (control means)
93 Knob (Wearing state adjustment means)
95 Wearing state adjusting unit (wearing state adjusting means)
97 Movable part (mounting means)
98 Curved part (mounting means)
100 Pulse wave sensor ((Biological signal measuring device)
110 Pulse wave sensor (Biological signal measuring device)
111 Wearing state adjusting unit (wearing state adjusting means)
112 Winding mechanism (adjustment means)
113 Movable part (second mounting means)
114 Belt 115 Mounting body (first mounting means)

Claims (12)

A biological signal measuring device that is attached to a measurement site of a biological body and measures a biological signal of the biological body,
An attachment means for attaching to the measurement site, having an annular shape, a cylindrical shape or a partial shape thereof,
A detection means for detecting the biological signal, facing the inside of the space formed by the annular shape, the cylindrical shape or the partial shape thereof,
The biological signal measuring apparatus, wherein the mounting means adjusts the mounting state while maintaining a constant positional relationship between the detection means and the measurement site.   The biological signal measuring apparatus according to claim 1, wherein the mounting means moves or deforms symmetrically with the measurement site as the center of symmetry. A biological signal measuring device that is attached to a measurement site of a biological body and measures a biological signal of the biological body,
An attachment means for attaching to the measurement site, having an annular shape, a cylindrical shape or a partial shape thereof,
A fixing means arranged on the mounting means and moving into the space formed by the annular shape, the cylindrical shape or a partial shape thereof;
A detecting means for facing the inside and detecting the biological signal,
The biological signal measuring apparatus, wherein the fixing means moves while maintaining a positional relationship between the detecting means and the measurement site constant. The fixing means includes a center direction moving means that moves in a direction toward the center of the space or the vicinity thereof,
4. The biological signal measuring apparatus according to claim 3, wherein the detection means is disposed on a surface of the center direction moving means facing the center or the vicinity thereof. A plurality of the above-mentioned central direction moving means,
The detection means is formed of a plurality of functional elements,
The plurality of functional elements are arranged in different central direction moving means so as to have a predetermined relative positional relationship between the plurality of functional elements,
The biological signal measuring apparatus according to claim 4, wherein the plurality of center direction moving units move while maintaining the predetermined positional relationship. A plurality of the above-mentioned central direction moving means,
The biological signal measuring apparatus according to claim 4, wherein movements of the plurality of central direction moving means are synchronized with each other. A mounting state adjusting means for adjusting a mounting state of the mounting means with respect to the living body;
The fixing means includes a first clamping means and a second clamping means that face each other symmetrically with respect to the space.
The biological signal measuring apparatus according to claim 3, wherein the wearing state adjusting means adjusts an interval between the first clamping means and the second clamping means. The fixing means further includes a center direction moving means for moving in a direction toward the center of the space or the vicinity thereof,
The detecting means is disposed on a surface of the central direction moving means facing the center,
8. The biological signal measuring apparatus according to claim 7, wherein the movement of the central direction moving means is interlocked with the operation of the first and second clamping means.   The mounting state adjusting means has a plurality of grooves that are arranged in line symmetry and are not parallel to each other, and moves the first clamping means and the second clamping means using the plurality of grooves as a guide. The biological signal measuring device according to claim 7.   The mounting state adjusting means has a plurality of grooves having a spiral shape or a partial shape thereof arranged symmetrically with respect to a point, and moves between the first clamping means and the second clamping means using the plurality of grooves as a guide. The biological signal measuring device according to claim 7, wherein: Driving means for moving the central direction moving means;
Control means for detecting the intensity of the biological signal detected by the detection means and outputting a signal for controlling the position of the central direction moving means to the drive means according to the intensity. The biological signal measuring device according to claim 4. The mounting means includes first mounting means and second mounting means that form the space,
The detection means is arranged in the second mounting means,
The first mounting means and the second mounting means are connected by a belt,
2. The biological signal measuring apparatus according to claim 1, further comprising adjusting means for adjusting the length of the belt while maintaining a constant inclination of the second mounting means with respect to the first mounting means.

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