JP6167581B2 - Biological information detection device - Google Patents

Description

  The present invention relates to a biological information detection device and the like.

  2. Description of the Related Art Conventionally, a biological information detection apparatus that detects biological information such as a human pulse wave is known. Patent Documents 1 and 2 disclose conventional techniques of a pulse meter which is an example of such a biological information detection apparatus. The pulse meter is attached to, for example, an arm, a wrist, a finger, or the like, and detects a pulsation derived from a heartbeat of a human body to measure a pulse rate.

  The pulsometers disclosed in Patent Documents 1 and 2 are photoelectric pulsometers, and the detection unit (pulse wave sensor) includes a light emitting unit that emits light toward a subject (detection site), and a target. A light receiving unit that receives light from the specimen (light having biological information) is included. In this pulse meter, a pulse wave is detected by detecting a change in blood flow as a change in the amount of received light. Patent Document 1 discloses a pulse meter that is worn on the wrist, and Patent Document 2 discloses a pulse meter that is worn on a finger.

JP2011-139725A JP 2009-201919 A

  In these conventional techniques, a translucent member that transmits light from the light emitting unit and light from the subject is provided, and this translucent member has a contact surface with the subject (such as the wrist or finger skin). ing. And if a convex part is provided in the contact surface of this translucent member, it will become easy to apply a press when contacting with the skin of a subject.

  However, as a side effect, it is easily affected by fluctuations in the pressure of the biological information detecting device due to body movements, movements of the user's hand wearing the biological information detecting device (for example, movement of a gooper), and the like. A large pressure fluctuation means that a body motion noise component superimposed on a detection signal of biological information is large.

  In addition, for example, when the convex portion of the translucent member formed of a hard material comes into contact with a soft biological surface such as skin, the flat portion around the convex portion and the biological surface are in a non-contact state, The contact state changes dynamically, for example, due to a weak contact state. When such a dynamic change of the contact state occurs, the intensity of light tends to occur optically, and when such light enters the light receiving part, it becomes noise that has no correlation with the pulse component, The quality of the information detection signal deteriorates.

  According to some aspects of the present invention, it is possible to provide a biological information detection apparatus and the like that can suppress deterioration in signal quality of a detection signal caused by a change in contact state around a convex portion.

  One embodiment of the present invention is provided on a body surface side of a biological information detection device that contacts a subject, and having a light receiving unit that receives light from the subject, and transmits light from the subject. And a translucent member having a convex portion that comes into contact with and presses the subject when measuring biological information of the subject, and is provided so as to surround the convex portion on the housing surface, and the convex portion A biological information detecting apparatus including a depression suppressing portion that suppresses a pressure applied to a specimen, and having a groove provided between the convex portion of the translucent member and the pressing suppression portion.

  According to one aspect of the present invention, when the biological information of the subject is measured, the convex portion of the translucent member comes into contact with the subject, and the light receiving unit of the detection unit receives light passing through the translucent member. The biological information of the subject is detected. And in one mode of the present invention, while the pressure suppression part which suppresses the press which a convex part gives to a subject is provided so that a convex part may be surrounded, between a convex part and a pressure suppression part of a translucent member A groove is provided. By providing such a groove portion, it is possible to suppress a dynamic change in the contact state around the convex portion or to concentrate a load on the convex portion at the time of initial pressing or the like. Accordingly, it is possible to effectively suppress the deterioration of the signal quality of the detection signal caused by the change of the contact state.

  In one embodiment of the present invention, the height of the convex portion, the height of the pressing suppression portion, and the height of the bottom surface of the groove portion in a direction orthogonal to the housing surface are HA, HB, and HC, respectively. In some cases, HA> HB> HC may be satisfied.

  If it does in this way, a convex part will contact a subject first, and then a press suppression part may contact with the surface of a subject, and it can control a convex part and press suppression while being able to control press of a convex part. Even when the part comes into contact with the subject, the bottom surface of the groove can be prevented from coming into contact with the surface of the subject.

  In one aspect of the present invention, when the difference between the height HA of the convex portion and the height HC of the bottom surface of the groove portion is Δh2, Δh2> 0.5 mm may be satisfied.

  In this way, by setting Δh2 corresponding to the depth of the groove portion to be larger than 0.5 mm, the bottom surface of the groove portion and the subject are in contact with each other or become in a weak contact state. It is possible to suppress the deterioration of the signal quality and the like.

  In one embodiment of the present invention, the groove may be provided over the entire periphery of the convex portion.

  If it does in this way, it will become possible to control that the dynamic change of a contact state generate | occur | produces in the perimeter of a convex part, for example, and the stable signal quality improvement of a detection signal is realizable.

  In the aspect of the invention, the bottom surface of the groove portion may be the surface of the translucent member.

  If it does in this way, a part of surface of a translucent member can be used effectively, and it will become possible to form the bottom of a slot.

  In one embodiment of the present invention, the translucent member includes the convex portion at least partially protruding toward the subject side, and a lower side that is opposite to the subject side with respect to the convex portion. And the bottom surface of the groove portion may be a surface of the body portion.

  If it does in this way, it will become possible to form the bottom face of a groove part by using effectively the surface of a part of body part of a translucent member.

  In the aspect of the invention, the body portion may be formed to extend from the position of the convex portion below the cover member on the housing surface, and the pressure suppression surface of the pressure suppression portion may be a surface of the cover member. May be.

  If it does in this way, it becomes possible to form a press restraining surface using the cover member above the body part effectively.

  Moreover, in one aspect of the present invention, when the amount of change in pressing of the convex portion with respect to the load by the load mechanism that generates pressing of the convex portion is defined as the amount of pressing change, the pressing suppression portion is configured so that the load of the load mechanism is The convex change amount is reduced so that the pressure change amount in the second load range in which the load of the load mechanism is larger than FL1 is smaller than the pressure change amount in the first load range of 0 to FL1. You may suppress the press which a part gives to the said test object.

  As described above, if the pressing of the convex portion is suppressed so that the pressing change amount in the second load range is smaller than the pressing change amount in the first load range, an appropriate initial pressing is applied to the convex portion. While applying to the specimen, it is possible to reduce the pressure fluctuation by suppressing the pressure applied to the subject by the convex portion.

  In the aspect of the invention, the pressing suppression portion may have a pressing suppression surface that spreads outward from the periphery of the convex portion.

  If it does in this way, the press which a convex part gives to a subject will be able to be controlled equally efficiently using the press restraint surface which spreads outside from the circumference of a convex part.

  In one embodiment of the present invention, a position that is separated from the position of the convex portion by a first distance in the predetermined direction is a first position, and is longer than the first distance in the predetermined direction from the position of the convex portion. The position separated by the second distance is the second position, the height of the pressure suppression surface in the direction perpendicular to the housing surface at the first position is HS1, and the position at the second position is HS1> HS2 may be sufficient when the height of the said pressure suppression surface in the direction orthogonal to a housing surface is set to HS2.

  If such a relationship of HS1> HS2 is established, it is possible to effectively suppress the occurrence of pressure fluctuation of the convex portion due to the variation of the contact state with the subject in a place far from the convex portion.

  Moreover, in one aspect of the present invention, the pressure suppression surface may be inclined such that a height in a direction orthogonal to the housing surface decreases from a position of the convex portion toward a predetermined direction.

  If such an inclination is provided, the height of the pressure suppression surface in the direction orthogonal to the housing surface decreases as the distance from the convex portion decreases, so the contact state with the subject at a location far from the convex portion, etc. The adverse effect due to can be reduced.

  Moreover, in one mode of the present invention, it is provided between the translucent member and the detection unit, between the translucent member and the subject, or in the translucent member, and between the subject and the detection unit. A stop portion for narrowing light from the subject in the optical path may be included.

  Providing such a diaphragm unit prevents the stray light from entering the light receiving unit even when stray light is generated due to a change in the contact state of the contact surface with the subject. It is possible to detect appropriate biological information.

  In the aspect of the invention, the detection unit includes a light emitting unit that emits light to the subject, and the light transmitting member transmits light from the light emitting unit, and the light receiving unit and the light emitting unit. A light-shielding part provided between the two parts may be further included.

  By providing such a light-shielding part, it is possible to suppress direct light from the light-emitting part from entering the light-receiving part, and it is possible to detect appropriate biological information.

  In the aspect of the invention, the convex portion may have a curved surface shape at least in a portion in contact with the subject.

  If it does in this way, it will become possible to give a press to a subject with a convex part in a stable contact state.

  In one embodiment of the present invention, a pulse wave may be detected as the biological information.

  However, the biological information to be detected by the biological information detection device is not limited to the pulse wave.

FIG. 1A and FIG. 1B are external views of the biological information detection apparatus of this embodiment. FIG. 2A to FIG. 2C are explanatory diagrams of a connecting portion of the biological information detecting device. The perspective view of the back cover part of the main-body part of a biometric information detection apparatus. Sectional drawing of a back cover part. FIG. 5A and FIG. 5B are explanatory views of a convex portion and a pressure suppressing portion of the light transmitting member. FIG. 6A and FIG. 6B are explanatory diagrams of a pressure suppression method using a pressure suppression unit. FIG. 7A and FIG. 7B are also explanatory diagrams of the pressure suppression method by the pressure suppression unit. 8A and 8B are diagrams showing the relationship between Δh and the MN ratio. FIG. 9A and FIG. 9B are explanatory diagrams of problems caused by changes in the contact state around the convex portion. FIG. 10A and FIG. 10B are explanatory diagrams of the technique of this embodiment in which a groove is provided. The figure which shows the relationship between the depth of a groove part, and MN ratio. FIGS. 12A and 12B are explanatory diagrams of problems when the biological information detection device is worn on the wrist. The top view for demonstrating the detail of a press suppression part. Sectional drawing for demonstrating the detail of a press suppression part. The figure which shows the relationship between the shape of a press suppression surface, and MN ratio. The figure which shows the relationship between the shape of a press suppression surface, and a press fluctuation | variation. FIG. 17A to FIG. 17C are modified examples of the pressing suppression unit. 18A and 18B are explanatory diagrams illustrating an example of a light-transmitting member. FIG. 19A and FIG. 19B are explanatory diagrams of problems when the pressure of the translucent member against the subject changes. 20A and 20B are explanatory diagrams of Hertz's elastic contact theory. FIGS. 21A and 21B are explanatory diagrams of a method of providing a diaphragm portion and a light shielding portion. 22A to 22C are diagrams showing various examples of the arrangement positions of the apertures. The perspective view of the member for light shielding which formed the aperture | diaphragm | squeeze part and the light-shielding part integrally. The functional block diagram which shows the example of the whole structure of a biometric information detection apparatus.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

1. Biological Information Detection Device FIG. 1A is an external view showing an example of a biological information detection device (biological information measurement device) of the present embodiment. This biological information detection device is a watch-type pulse meter, and has a main body 300 and bands 320 and 322 (wrist bands) for attaching the biological information detection device to a wrist 400 of a subject. The main body unit 300 which is a device main body is provided with a display unit 310 that displays various types of information, a pulse wave sensor (a sensor configured by a detection unit, a translucent member, etc.), a processing unit that performs various types of processing, and the like. It is done. The display unit 310 displays the measured pulse rate and time. In FIG. 1A, the circumferential direction of the wrist 400 (or arm) is defined as a first direction DR1, and the direction from the hand 410 toward the lower arm 420 is defined as a second direction DR2.

  FIG. 1B is an external view illustrating a detailed configuration example of the biological information detection apparatus. The bands 320 and 322 are connected to the main body 300 via the stretchable parts 330 and 332. The stretchable parts 330 and 332 can be deformed along the first direction DR1 and the second direction DR2 in FIG. A connecting portion 340 is connected to one end of the band 320. The connecting portion 340 corresponds to a buckle in a timepiece, and a band hole portion into which a buckle bar portion is inserted is formed in a band 322 on the opposite side.

  As shown in FIG. 2A, the connecting portion 340 includes a fixing member 342 fixed to the band 320, a slide member 344, and springs 350 and 352 that are elastic members. As shown in FIGS. 2B and 2C, the slide member 344 is slidably attached to the fixed member 342 along the slide direction DRS, and the springs 350 and 352 are slid. Generates a pulling force in time. The load mechanism of this embodiment is realized by the springs 350 and 352, the expansion and contraction portions 330 and 332, the bands 320 and 322, and the like.

  The fixing member 342 is provided with an indicator 343, and the indicator 343 is provided with a scale for indicating an appropriate slide range. Specifically, the display 343 is provided with points P1 and P2 indicating an appropriate slide range (pressing range). If the end of the slide member 344 on the band 320 side is located within the range of these points P1 and P2, it is within the proper slide range (pressing range) and an appropriate tensile force is applied. It is guaranteed that The user inserts the rod portion of the connecting portion 340 that is a buckle into the band hole portion of the band 322 so as to be within the proper slide range, and attaches the biological information detection device to the wrist. By doing so, it is ensured to some extent that the pressure of the pulse wave sensor (the convex portion of the translucent member) on the subject is the appropriate pressure assumed. Details of the structure of the biological information detection apparatus shown in FIGS. 1A to 2C are disclosed in Japanese Patent Application Laid-Open No. 2012-90975.

  In addition, although FIG. 1 (A)-FIG.2 (C) demonstrated taking the case where the biometric information detection apparatus was a timepiece type | mold pulse meter with which a wrist is mounted | worn, this embodiment is not limited to this. For example, the biological information detection apparatus of the present embodiment may be mounted on a part other than the wrist (for example, finger, upper arm, chest, etc.) and detect (measure) biological information. Further, the biological information to be detected by the biological information detection device is not limited to the pulse wave (pulse rate), and the biological information detection device can detect biological information other than the pulse wave (for example, oxygen saturation in the blood, body temperature, A device that detects a heartbeat or the like may be used.

  FIG. 3 is a perspective view illustrating a configuration example of the back cover 10 provided on the back side of the main body 300 of the biological information detection apparatus, and FIG. 4 is a cross-sectional view taken along line A-A ′ of FIG. 3. The back cover part 10 is composed of a cover member 20 and a translucent member 30, and the back cover part 10 forms a housing surface 22 (back face) on the back side of the main body part 300.

  The translucent member 30 is provided on the side of the housing surface 22 that comes into contact with the subject of the biological information detecting device, and transmits light from the subject. The translucent member 30 contacts the subject when measuring the biological information of the subject. For example, the convex part 40 of the translucent member 30 contacts the subject. The surface shape of the convex portion 40 is desirably a curved surface shape (spherical shape), but is not limited to this, and various shapes can be adopted. Moreover, the translucent member 30 should just be transparent with respect to the wavelength of the light from a subject, and may use a transparent material and may use a colored material.

  As shown in FIG. 4, the cover member 20 is formed so as to cover the translucent member 30. Although the translucent member 30 has translucency, the cover member 20 does not have translucency and is a non-translucent member. For example, the translucent member 30 is formed of a transparent resin (plastic), and the cover member 20 is formed of a predetermined color resin such as black. In addition, non-light-transmissive means the material which does not permeate | transmit the light of the wavelength which a biological information detection apparatus can detect.

  As shown in FIGS. 3 and 4, a part of the translucent member 30 is exposed to the subject side from the opening of the cover member 20, and the convex portion 40 is formed on the exposed portion. Therefore, at the time of measuring biometric information, the convex portion 40 formed on the exposed portion comes into contact with the subject (for example, the skin of the user's wrist). In FIG. 3 and FIG. 4, a detection window of the biological information detection device is configured by the convex portion 40 formed in the exposed portion. Here, in FIG. 4, the translucent member 30 is provided also in parts other than this detection window, ie, the back side part of the cover member 20 (pressing suppression part 60). However, this embodiment is not limited to this, You may provide the translucent member 30 only in the part of a detection window.

  In addition, as shown in FIG. 4, the groove part 42 for suppressing a press fluctuation | variation etc. is provided in the circumference | surroundings of the convex part 40. As shown in FIG. Further, when the surface on the side where the convex portion 40 is provided in the translucent member 30 is the first surface, the translucent member 30 corresponds to the convex portion 40 on the second surface on the back side of the first surface. A recessed portion 32 is provided at a position to be used. The back cover 10 is also provided with a screw hole 24 for screwing the back cover 10 and a terminal hole 26 for connecting a terminal for signal transmission and power supply.

  As shown in FIG. 3, when the body surface 22 (back surface) of the biological information detection device is partitioned into a first region RG1 and a second region RG2 by a center line CL along the first direction DR1, The convex portion 40 is provided in the first region RG1. Taking a biological information detection device of the type worn on the wrist as shown in FIG. 1A as an example, the first region RG1 is a hand side (3 o'clock direction in the watch) region, and the second region RG2 Is an area on the lower arm side (9 o'clock direction on the watch). Thus, the convex part 40 of the translucent member 30 is provided in the first region RG1 on the side close to the hand on the housing surface 22. By doing so, the convex portion 40 is arranged at a place where the change in the diameter of the arm is small, so that the pressure fluctuation and the like can be suppressed.

  And the convex part 40 contacts a subject at the time of the measurement of the biological information of a subject, and gives a press (pressing force). Specifically, when the user wears the biological information detection device on the wrist and detects biological information such as a pulse wave, the convex portion 40 comes into contact with the skin of the user's wrist and gives pressure. This pressing is generated by the load by the load mechanism described with reference to FIGS. 1 (A) to 2 (C).

  In addition, the housing surface 22 of the biological information detection device is provided with a pressure suppression unit 60 that suppresses the pressure applied by the convex portion 40 to the subject (the wrist skin). 3 and 4, the pressing suppression unit 60 is provided on the housing surface 22 so as to surround the convex portion 40 of the translucent member 30. The surface of the cover member 20 functions as the pressing suppression unit 60. That is, the pressing suppression part 60 is formed by molding the surface of the cover member 20 into a bank shape. As shown in FIG. 4, the pressure suppression surface of the pressure suppression unit 60 is inclined so as to become lower from the position of the convex portion 40 toward the second direction DR2 (the direction from the wrist to the lower arm). . That is, the height in the direction DRH orthogonal to the housing surface 22 is inclined so as to become lower in the second direction DR2.

  3 and 4, the detection unit 130 and the convex portion 40 (detection window) are provided in the first region RG1 on the hand side (3 o'clock direction) of the housing surface 22 (back surface). The embodiment is not limited to this. For example, the detection part 130 and the convex part 40 (detection window) may be provided in the center part area | region (area | region where the centerline CL passes) of the housing surface 22, etc., and the press suppression part 60 may be provided in the periphery.

  As shown in FIG. 4, a detection unit 130 is provided below the convex portion 40 of the translucent member 30. Here, the upper direction is the direction DRH, and the lower direction is the direction opposite to the direction DRH. In other words, the downward direction is a direction from the back surface (the surface on the side in contact with the subject) of the main body 300 of the biological information detection apparatus to the front surface (the surface on the side not in contact with the subject). The pulse wave sensor in the present embodiment is a sensor unit including such a light transmitting member 30, the detection unit 130, and the like.

  The detection unit 130 includes a light receiving unit 140 and a light emitting unit 150. The light receiving unit 140 and the light emitting unit 150 are mounted on the substrate 160. The light receiving unit 140 receives light (reflected light, transmitted light, etc.) from the subject. The light emitting unit 150 emits light to the subject. For example, when the light emitting unit 150 emits light to the subject and the light is reflected by the subject (blood vessel), the light receiving unit 140 receives and detects the reflected light. The light receiving unit 140 can be realized by a light receiving element such as a photodiode. The light emitting unit 150 can be realized by a light emitting element such as an LED. For example, the light receiving unit 140 can be realized by a PN junction diode element or the like formed on a semiconductor substrate. In this case, an angle limiting filter for narrowing the light receiving angle and a wavelength limiting filter for limiting the wavelength of light incident on the light receiving element may be formed on the diode element.

  Taking a pulse meter as an example, the light from the light emitting unit 150 travels inside the subject and diffuses or scatters in the epidermis, dermis, subcutaneous tissue, and the like. Thereafter, this light reaches the blood vessel (detected site) and is reflected. At this time, part of the light is absorbed by the blood vessels. Then, the light absorption rate in the blood vessel changes due to the influence of the pulse, and the amount of reflected light also changes. Therefore, the light receiving unit 140 receives this reflected light and detects the change in the amount of light, thereby detecting biological information. It becomes possible to detect the pulse rate and the like.

  In FIG. 4, both the light receiving unit 140 and the light emitting unit 150 are provided as the detecting unit 130. However, for example, only the light receiving unit 140 may be provided. In this case, for example, the light receiving unit 140 receives transmitted light from the subject. For example, when light from the light emitting unit 150 provided on the back side of the subject passes through the subject, the light receiving unit 140 receives and detects the transmitted light.

  And in this embodiment, as shown in FIG. 4, the aperture | diaphragm | squeeze parts 80 and 82 are provided. When the light receiving unit 140 is provided as the detection unit 130, the diaphragm units 80 and 82 throttle light from the subject in the optical path between the subject and the detection unit 130. When the light emitting unit 150 is provided as the detection unit 130, the diaphragm units 80 and 82 condense the light from the light emitting unit 150 in the optical path between the subject and the detection unit 130. In FIG. 4, the aperture portions 80 and 82 are provided between the translucent member 30 and the detection unit 130. However, the diaphragms 80 and 82 may be provided between the translucent member 30 and the subject or in the translucent member 30. For example, the diaphragm portions 80 and 82 are disposed in proximity to the translucent member 30.

  In FIG. 4, the light shielding unit 100 is provided between the light receiving unit 140 and the light emitting unit 150. When both the light receiving unit 140 and the light emitting unit 150 are provided as the detecting unit 130, the light shielding unit 100 shields light from the light emitting unit 150 from being directly incident on the light receiving unit 140, for example.

2. As shown in FIG. 5A, in the present embodiment, the translucent member 30 is in contact with the subject and applies pressure when measuring the biological information of the subject. have. In addition, the biological information detection apparatus includes a pressing suppression unit 60. The pressing suppression unit 60 is provided so as to surround the convex portion 40 on the body surface (surface on the subject side) of the biological information detecting device, and suppresses the pressure that the convex portion 40 applies to the subject.

  In the present embodiment, for example, the height of the convex portion 40 in the direction DRH perpendicular to the housing surface of the biological information detecting device is HA (for example, the height of the apex of the curved surface shape of the convex portion 40), and the pressure suppressing unit 60 is used. Is HB (height at the highest place) and Δh is a value obtained by subtracting height HB from height HA (difference between height HA and HB), Δh = HA−HB> 0 The relationship is established. For example, the convex portion 40 protrudes from the pressure suppression surface of the pressure suppression unit 60 toward the subject so that Δh> 0. That is, the convex portion 40 protrudes toward the subject side by Δh from the pressure suppression surface of the pressure suppression portion 60.

  As described above, by providing the convex portion 40 that satisfies Δh> 0, for example, it is possible to apply an initial pressure to the subject to exceed the vein vanishing point. In addition, by providing the pressure suppressing unit 60 for suppressing the pressure applied to the subject by the convex portion 40, it is possible to minimize the pressure fluctuation in the usage range in which the biological information is measured by the biological information detecting device. Therefore, noise components and the like can be reduced. Further, if the convex portion 40 protrudes from the pressure suppression surface so that Δh> 0, the pressure suppression surface of the pressure suppression portion 60 is the subject after the convex portion 40 comes into contact with the subject and gives an initial pressure. The pressure applied to the subject by the convex portion 40 can be suppressed. Here, the vein vanishing point is reduced to such an extent that the signal caused by the vein superimposed on the pulse wave signal disappears or does not affect the pulse wave measurement when the convex portion 40 is brought into contact with the subject and the pressure is gradually increased. It is a point.

  For example, in FIG. 5B, the horizontal axis is generated by the load mechanism described in FIGS. 1B to 2C (a mechanism constituted by an elastic member such as a spring or a stretchable part, a band, or the like). The load represents the load, and the vertical axis represents the pressure (pressure applied to the blood vessel) that the convex portion 40 applies to the subject. Then, it is assumed that the amount of change in the pressing of the convex portion 40 with respect to the load by the load mechanism that generates the pressing of the convex portion 40 is a pressing change amount. This amount of change in pressure corresponds to the inclination of the change characteristic of pressure against the load.

  In this case, the pressure suppression unit 60 has a second load range in which the load of the load mechanism is larger than FL1 with respect to the pressure change amount VF1 in the first load range RF1 in which the load of the load mechanism is 0 to FL1. The pressure applied to the subject by the convex portion 40 is suppressed so that the pressure change amount VF2 at RF2 is reduced. That is, in the first load range RF1 that is the initial pressing range, the pressing change amount VF1 is increased, while in the second load range RF2 that is the usage range of the biological information detecting device, the pressing change amount VF2 is decreased.

  That is, in the first load range RF1, the pressure change amount VF1 is increased to increase the inclination of the pressure change characteristic with respect to the load. Such a pressing with a large gradient of the change characteristic is realized by Δh corresponding to the protrusion amount of the convex portion 40. That is, by providing the convex portion 40 where Δh> 0, even when the load by the load mechanism is small, it is possible to give the subject an initial pressure necessary and sufficient to exceed the venous vanishing point. become.

  On the other hand, in the second load range RF2, the pressure change amount VF2 is reduced to reduce the inclination of the pressure change characteristic with respect to the load. Such a pressing with a small inclination of the change characteristic is realized by pressing suppression by the pressing suppressing unit 60. In other words, the pressure suppression unit 60 suppresses the pressure applied to the subject by the convex portion 40, thereby minimizing the pressure variation even when there is a load variation or the like in the usage range of the biological information detection device. It becomes possible to suppress. As a result, noise components can be reduced.

  In this way, it is possible to obtain a pulse wave detection signal having a higher M / N ratio (S / N ratio) by applying an optimized pressure (for example, about 16 kPa) to the subject. . That is, the signal component of the pulse wave sensor can be increased and the noise component can be reduced. Here, M represents the signal level of the pulse wave detection signal, and N represents the noise level.

  In addition, by setting the pressure range used for pulse wave measurement to a range corresponding to the second load range RF2, it is possible to suppress a minimum pressure fluctuation (for example, about ± 4 kPa), and a noise component Can be reduced.

  Further, the pressure suppression unit 60 has a pressure suppression surface that spreads outward from the periphery of the convex portion 40. For example, the pressing suppression unit 60 is a second direction orthogonal to the first direction DR1 that is the circumferential direction of the detection site (such as a wrist or an arm) of the subject in a plan view from a direction orthogonal to the body surface. It has a pressure suppression surface that extends to DR2. Specifically, as illustrated in FIGS. 3 and 4, the pressure suppression unit 60 has a pressure suppression surface that extends from the position of the convex portion 40 toward the second direction DR <b> 2 (the direction from the hand toward the lower arm). Have. For example, the pressure suppression surface of the pressure suppression unit 60 is realized by a bank-shaped portion formed on the cover member 20.

  In FIG. 3, it is assumed that a direction orthogonal to the first direction DR1 is a second direction DR2, and a direction opposite to the second direction DR2 is a third direction DR3. In this case, the pressure suppression surface of the pressure suppression unit 60 is a continuous surface around the convex portion 40 in at least the first direction DR1, the second direction DR2, and the third direction DR3. That is, the surface is continuous in at least three directions from the position of the convex portion 40. Specifically, in FIG. 3, the pressure suppression surface of the pressure suppression unit 60 is a continuous surface over the entire circumference (four sides) of the convex portion 40. That is, a pressure suppression surface is formed on the entire periphery of the convex portion 40. In this way, since the pressing of the convex portion 40 can be suppressed by the pressing suppression surfaces existing in at least the first, second, and third directions DR1, DR2, and DR3, the pressure suppression is uniform and efficient. Is possible.

  3 and 4, the translucent member 30 having the convex portion 40 is fixed to the housing surface 22. That is, since the translucent member 30 is fixedly attached to the housing surface 22, the translucent member 30 is attached to the housing surface 22 (biological information detection device) even when a load is applied by the load mechanism. It does not move relative to it. For example, it is possible to provide a movable structure in which a damper mechanism is provided so that the translucent member 30 moves up and down when a load is applied by the load mechanism. In FIGS. Does not adopt a movable structure.

  Moreover, in FIG. 3, FIG. 4, the press suppression part 60 is formed of the insulating member. That is, the pressing suppression portion 60 is not an electrode formed of a conductive member (metal member) or the like, but an insulating member formed of an insulating material such as a resin (plastic) for suppressing the pressing of the convex portion 40. It has become.

  In FIG. 5A, by providing the aperture portions 80 and 82 (aperture) and the light shielding portion 100, optical noise is reduced, and noise components riding on the pulse wave detection signal are further reduced. For example, the diaphragm portions 80 and 82 block light passing through the peripheral region of the convex portion 40 as indicated by C1 and C2. By doing so, it is possible to suppress a decrease in reliability of measurement data caused by stray light in a place where the contact state is unstable such as C1 and C2.

  Further, the closer the distance between the light receiving unit 140 and the light emitting unit 150 is, the more the optical efficiency / performance is improved. However, when the distance between the light receiving unit 140 and the light emitting unit 150 is reduced, the possibility that the direct light from the light emitting unit 150 is incident on the light receiving unit 140 and the performance deteriorates increases. Therefore, in FIG. 5A, the light shielding unit 100 is provided between the light receiving unit 140 and the light emitting unit 150 to suppress direct light from the light emitting unit 150 from entering the light receiving unit 140. By doing so, the superposition of noise components due to direct light can be suppressed, so that the M / N ratio can be further improved. It should be noted that a modification in which at least one of the diaphragm portions 80 and 82 and the light shielding portion 100 is not provided is also possible.

  FIG. 6A to FIG. 7B are diagrams for explaining the pressing suppression method by the pressing suppression unit 60 in more detail.

  For example, in FIG. 6A, the convex portion 40 of the biological information detecting device is in contact with a subject (such as a wrist). On the other hand, the pressure suppression surface 62 of the pressure suppression unit 60 is not in contact with the subject.

  As shown in FIG. 6A, when the convex portion 40 comes into contact with the surface (skin or the like) of the subject while applying a load by the load mechanism, the convex portion 40 sinks into the surface, which is indicated by D1 in FIG. 6B. So that the pressure increases rapidly. This corresponds to the initial pressing range described with reference to FIG. 5B. In this initial pressing range, the amount of pressing change is large as described above. That is, by providing the convex portion 40, it is possible to give the subject an initial pressure necessary and sufficient to exceed the venous vanishing point even when the load by the load mechanism is small.

  In FIG. 7A, the load by the load mechanism further increases, so that not only the convex portion 40 but also the pressure suppression surface 62 of the pressure suppression unit 60 is in contact with the surface (skin etc.) of the subject. Thus, the contact area with the subject increases as the pressure suppression surface 62 contacts the surface of the subject. Thereby, as shown to D2 of FIG.7 (B), the increase in the press which the convex part 40 gives to a subject is suppressed. That is, the pressing change amount described in FIG. 5B decreases as indicated by D2 in FIG. 7B. That is, the inclination of the change characteristic of the pressure with respect to the load becomes small. Therefore, even if the load by the load mechanism increases, the degree of increase in pressure (pressure per unit area) applied to the subject by the contact surface of the convex portion 40 is weakened. As a result, in the optimum pressing range (RF2 in FIG. 5B), it is possible to sufficiently reduce the pressing change amount (change characteristic inclination). Therefore, in the usage range of the biological information detection apparatus, even when there is a load variation or the like, it is possible to minimize the variation in the pressure, and the MN ratio representing the quality of the signal can be improved.

  As described above, in the present embodiment, by providing the convex portion 40 that satisfies Δh> 0, the pressure applied to the subject by the convex portion 40 is rapidly increased in the initial pressing range. On the other hand, by providing the pressure suppression part 60 (pressure suppression surface) around the convex part 40, in the range of use, the pressure change amount that is the change amount of the pressure with respect to the load is reduced by the pressure suppression by the pressure suppression part 60. Thus, the pressure fluctuation is reduced.

3. Δh of convex part
Δh representing the protruding amount of the convex portion 40 is an important parameter that defines the optimum pressing force. That is, in order to always give a pressure for exceeding the venous vanishing point, a certain amount of pop-out amount is necessary, and Δh needs to be a large value. However, if Δh becomes an excessive value, it may cause a reduction in the signal component of the pulse wave sensor and an increase in pressure fluctuation.

  Therefore, the minimum Δh is selected within a range where a signal component of the pulse wave sensor can be sufficiently secured, that is, within a range where the optimum pressure can be applied. That is, as long as Δh is smaller, the noise component can be kept lower as long as the optimum pressure can be applied.

  For example, FIG. 8A is an example of a measurement value representing the relationship between Δh and the MN ratio (SN ratio) when the user performs a grouper action (GP). FIG. 8B is an example of a measured value representing the relationship between Δh and the MN ratio when the user performs a running operation (RUN). Here, the MN ratio corresponds to the ratio of the signal component (M) and the noise component (N) of the pulse wave sensor.

  For example, in FIGS. 8A and 8B, the MN ratio tends to increase as Δh increases from 0.01 mm to 0.05 mm. Furthermore, as Δh increases from 0.05 mm to 0.15 mm and from 0.15 mm to 0.25 mm, the MN ratio tends to increase. And the increase rate of the MN ratio in the range of 0.05 mm to 0.25 mm tends to be higher than the increase rate in the range of 0.01 mm to 0.05 mm. Further, the increase rate of the MN ratio in the range of 0.15 mm to 0.25 mm tends to be higher than the increase rate in the range of 0.05 mm to 0.15 mm.

  Further, as Δh decreases from 0.5 mm to 0.35 mm, the MN ratio tends to increase. Furthermore, as Δh decreases from 0.35 mm to 0.25 mm, the MN ratio tends to increase. The rate of increase in MN ratio in the range of 0.35 mm to 0.25 mm tends to be higher than the rate of increase in the range of 0.5 mm to 0.35 mm.

  As described above, the range of Δh is desirably 0.01 mm ≦ Δh ≦ 0.5 mm, and more desirably 0.05 mm ≦ Δh ≦ 0.35 mm. For example, by making Δh = about 0.25 mm, the MN ratio can be maximized. That is, by setting Δh to a small value in this way, an increase in noise components caused by pressure fluctuations or the like is suppressed while giving the subject a minimum pressure for exceeding the venous vanishing point, and the signal It becomes possible to increase the MN ratio representing the quality.

  Moreover, in this embodiment, the convex part 40 has a curved surface shape in the part which contacts a subject at least. Thus, if the surface shape of the convex part 40 is made into a curved surface shape, it will be possible to apply pressure to the subject by the convex part in a stable contact state.

  In this case, when the curvature radius of the curved surface shape of the convex portion is R, for example, it is desirable that R ≧ 8 mm. If it does in this way, it will become possible to give a pressure efficiently on the conditions of the curvature radius in which the contact state with the surface of living bodies, such as skin, is stabilized.

4). Groove Part As shown in FIG. 5A, in this embodiment, a groove part 42 is provided between the convex part 40 of the translucent member 30 and the press suppressing part 60.

  On the other hand, in the translucent member 30 of FIG. 9 (A), the groove part 42 as shown in FIG. 5 (A) is not provided, but only the flat part 52 is provided. The height of the flat portion 52 is, for example, the same height as the height of the press suppressing portion 60 (the height at the end).

  However, it has been found that the configuration having no groove 42 as shown in FIG. 9A has the following problems.

  For example, FIG. 9B shows a state where the translucent member 30 of FIG. 9A is in contact with the subject. As shown in FIG. 9B, when the surface of a relatively soft subject such as skin comes into contact with the contact surface of the transparent material 30 made of a hard material formed of resin or glass, the contact state Becomes unstable. For example, in F1 and F2 of FIG. 9B, the flat portion 52 of the translucent member 30 and the surface (skin) of the subject are in a weak contact state. In this case, for example, with the passage of time, the surface of the subject moves away from the flat portion 52 of the translucent member 30 and becomes in a non-contact state, so that the contact state dynamically changes. Then, due to such a dynamic change of the contact state, the intensity of light is likely to be generated optically, and if such light enters the light receiving unit 140, noise having no correlation with the pulse component and turn into.

  For example, in order to obtain a pulse wave detection signal with a low noise component, it is necessary to apply an initial pressure to the surface of the subject that exceeds the venous vanishing point. In FIG. 9B, the contact surface of the convex portion 40 is given an appropriate pressure sufficient to exceed the venous vanishing point, but in the contact surface in the weak contact state shown in F1 and F2, Proper pressure is not given. Therefore, when light from the contact surfaces of F1 and F2 is incident on the light receiving unit 140 in FIG. 5A, a situation occurs in which noise having no correlation with the pulse component is superimposed on the pulse wave detection signal. That is, since the pulse wave detection signal is detected by the total amount of light received by the light receiving unit 140, in addition to the light from the contact surface of the convex portion 40, the light from the contact surface in a weak contact state of F1 and F2 is received by the light receiving unit. When the light is incident on 140, the light component acts as a noise component, and reduces the MN ratio of the pulse wave detection signal.

  Therefore, in order to suppress the adverse effect due to the dynamic change of the contact state around the convex portion 40, in the present embodiment, as shown in FIG. 10A, the convex portion 40 of the translucent member 30. A groove portion 42 is provided between the pressure suppressing portion 60 and the pressure suppressing portion 60. In other words, a bank-shaped pressure suppression portion 60 lower than the convex portion 40 is provided around the convex portion 40 constituting the pulse wave sensor, and a groove portion serving as a gap is formed between the convex portion 40 and the pressure suppression portion 60. 42 is provided. The bottom surface of the groove portion 42 is constituted by, for example, the surface of the translucent member 30 (surface on the subject side).

  If it does in this way, as shown to G1 and G2 of FIG.10 (B), the dynamic change of the contact state around the convex part 40 can be suppressed. That is, it is possible to effectively suppress an unstable contact state between the periphery (flat portion) of the convex portion 40 and the surface of the subject like F1 and F2 in FIG. 9B. That is, since the bottom surface of the groove portion 42 indicated by G1 and G2 in FIG. 10B is not in contact with the subject, a dynamic change in the contact state is unlikely to occur.

  Then, for example, diaphragm portions 80 and 82 as shown in FIGS. 21A and 21B, which will be described later, are provided so that light at G1 and G2 in FIG. By doing so, it is possible to effectively suppress a decrease in the MN ratio of the pulse wave detection signal caused by stray light in G1 and G2.

  In this case, in the method in which the groove portion 42 is not provided, it is necessary to make the aperture areas of the aperture portions 80 and 82 smaller in order to suppress adverse effects due to stray light. If the aperture areas of the diaphragm portions 80 and 82 are reduced, the amount of light received by the light receiving portion 140 is reduced, the signal component of the pulse wave detection signal is lowered, and the MN ratio is lowered. In this regard, if the groove portion 42 is provided as in the present embodiment, the aperture areas of the throttle portions 80 and 82 can be increased to some extent, and a decrease in the MN ratio can be suppressed.

  Moreover, in order to obtain a press like D1 of FIG. 6 (B), it is necessary to concentrate a load on the convex part 40 in the case of an initial press. In this regard, if the groove portion 42 as in the present embodiment is provided, a situation in which the surface around the convex portion 40 contacts the surface of the subject during initial pressing and the load on the convex portion 40 is dispersed. Can be suppressed. Accordingly, it is possible to concentrate the load on the convex portion 40 at the time of the initial pressing, and it becomes easy to apply an appropriate pressing exceeding the vein vanishing point to the surface of the subject.

  In the present embodiment, for example, as shown in FIG. 4, a groove portion 42 is provided over the entire periphery of the convex portion 40. That is, the cross-sectional shape of the groove portion 42 is a groove shape (concave shape) in all cross sections passing through the position of the convex portion 40. By doing in this way, it becomes possible to suppress the dynamic change of the contact state around the entire periphery of the convex portion 40, and it is possible to realize a stable signal quality improvement of the detection signal.

  However, this embodiment is not limited to this, and the groove part 42 should just have groove shape (concave shape) in the predetermined cross section as shown, for example to FIG. 10 (A). Specifically, it is only necessary to have a groove shape (concave shape) in a cross section (a surface orthogonal to the housing surface) in at least three directions (first, second, and third directions DR1, DR2, DR3). For example, a region where the groove 42 is not formed may exist in a part of the periphery of the convex portion 40. For example, a connecting member (bridge) that connects the convex portion 40 and the pressure suppressing portion 60 may be provided in a part of the periphery of the convex portion 40.

  Further, as shown in FIG. 10 (A), the height of the convex portion 40, the height of the pressure suppressing portion 60, and the height of the bottom surface of the groove portion 42 in the direction DRH orthogonal to the housing surface 22 of the biological information detecting device Assume that HA, HB, and HC, respectively. For example, when the convex portion 40 has a curved surface shape, HA is the height of the vertex of the curved surface. Moreover, HB is the height in the highest place of the press suppression part 60, for example. HC is the height of a plane that forms at least a part of the bottom surface of the groove 40.

  In this case, in the present embodiment, the relationship HA> HB> HC is established. That is, the convex part 40 is the highest, the pressure suppression part 60 is the next highest, and the bottom face of the groove part 42 is the lowest.

  In this way, when a load is applied by the load mechanism, the convex portion 40 first comes into contact with the surface of the subject, thereby obtaining an initial press, and thereafter, with respect to the surface of the subject. Then, the pressing suppression unit 60 comes into contact, and thereby the pressing suppression effect described in D2 of FIG. 7B can be obtained. Even when the convex portion 40 and the pressure suppression portion 60 are in contact with the surface of the subject as described above, as shown in G1 and G2 of FIG. Does not contact the surface of the subject. Accordingly, it is possible to effectively suppress a decrease in the MN ratio due to the unstable contact state.

  Moreover, the depth of the groove part 42 should just be a depth which the bottom face does not touch the surface (skin) of a subject, when a load is applied with a load mechanism. For example, as shown in FIG. 10A, when the difference between the height HA of the convex portion 40 and the height HC of the bottom surface of the groove portion is Δh2 = HA−HC, in this embodiment, Δh2> 0.5 mm. It is desirable that

  For example, FIG. 11 is an example of measured values showing the relationship between the depth of the groove 42 and the MN ratio. The depth of the groove 42 corresponds to the above-described Δh2. As shown in FIG. 11, for the majority of users, the MN ratio of the pulse wave detection signal is higher when the depth of the groove 42 is 0.8 mm than when the depth is 0.5 mm. When the depth (Δh2) of the groove 42 is 0.5 mm or less, the MN ratio of the pulse wave detection signal is rapidly reduced for many users. For example, if the skin elasticity is relatively soft, even if the groove portion 42 is present, if the depth is shallow, the bottom surface of the groove portion 42 and the skin surface are in contact with each other at G1 and G2 in FIG. State), and the MN ratio deteriorates due to stray light or the like in this portion. Therefore, it is desirable that Δh2 corresponding to the depth of the groove portion 42 is larger than 0.5 mm.

  In FIG. 3, the groove portion 42 has a concentric shape with respect to the convex portion 40, but the shape of the groove portion 42 of the present embodiment is not limited to this, and various modifications can be made. For example, as the shape of the groove portion 42, various shapes such as a shape in which the convex portion 40 and the press suppressing portion 60 are connected by a connecting member in a part of the periphery of the convex portion 40 can be adopted.

  Further, the inner wall and the bottom surface of the groove 42 may be subjected to a processing process for shielding light. For example, the color of the inner wall and bottom surface of the groove 42 is set to a predetermined color such as black. Alternatively, processing for roughening the inner wall and bottom surface of the groove portion 42 is performed to suppress the reflectance of light, or the inner wall and bottom surface of the groove portion 42 is made into a moth-eye structure to form an antireflection structure. By doing so, it is possible to suppress a situation in which the reflected light at the groove 42 becomes stray light and becomes a noise component of the measurement data.

5. Details of Press Suppression Unit Next, a detailed example of the press suppression unit 60 will be described. In the pressure suppression unit 60 (bank structure), variation in pressure (contact pressure) applied to the vicinity of the convex portion 40 can be suppressed by increasing the area of the pressure suppression surface 62 (contact area with the subject).

  However, if the area of the pressure suppression surface 62 is excessively increased or the height of the pressure suppression surface 62 is excessively increased with respect to the pulse wave sensor, the pressure applied to the vicinity of the convex portion 40 does not reach the appropriate range, and pulse wave detection is performed. There is a problem that the signal quality may be insufficient.

  On the other hand, if the area of the pressure suppression surface 62 is reduced or the height is reduced, there is a problem that the effect of suppressing pressure cannot be sufficiently exhibited. The inability to exert the effect of suppressing pressure means that the pressure fluctuation increases and the noise component of the pulse wave detection signal increases.

  For example, as shown in FIG. 12A, as the bone near the wrist, there are a rib on the thumb side and an ulna on the little finger side. Then, as shown in FIG. 12B, when the biological information such as a pulse wave is detected by bringing the convex portion 40 of the biological information detecting device or the pressing suppression surface 62 of the pressing suppressing unit 60 into contact with the skin of the wrist. It is desirable to increase the contact area between the pressure suppression surface 62 and the wrist skin while preventing interference with these ribs and ulna. By doing so, it becomes easy to apply pressure to the pulse wave sensor, and the pressure fluctuation can be effectively suppressed.

  For this reason, in the biological information detection apparatus of the present embodiment, a pressure suppression unit 60 that suppresses the pressure applied by the convex portion 40 to the subject is provided.

  Then, as shown in FIG. 13, when the housing surface 22 is partitioned into the first region RG1 and the second region RG2 by the center line CL along the first direction DR1, the convex portion 40 (pulse wave sensor) ) Is provided in the first region RG1.

  For example, it is assumed that the direction perpendicular to the first direction DR1 and going from the convex portion 40 toward the center line CL is the second direction DR2. When the biological information detection device is attached to the wrist of the subject, the second direction DR2 is a direction from the subject's hand toward the lower arm. At this time, the convex portion 40 is provided on the hand side of the subject's hand and lower arm. That is, of the first region RG1 on the hand side and the second region RG2 on the lower arm side, the convex portion 40 is provided in the first region RG1 on the hand side.

  Furthermore, as shown in FIGS. 13 and 14, the pressure suppression unit 60 includes a pressure suppression surface 62 that extends in the second direction DR2 from the position PS of the convex portion 40 (the highest position of the convex portion). That is, the pressing suppression surface 62 extends from the position PS of the convex portion 40 toward the second direction DR2 (lower arm).

  Specifically, the pressure suppression surface 62 is a surface that extends from the position PS of the convex portion 40 in the second direction DR2 beyond the center line CL. For example, as shown in FIG. 13, when the length of the pressure suppressing surface 62 (press suppressing portion) is LS and the length of the casing surface 22 (back surface of the main body portion, back cover) is LC, LS <LC. ing. In this case, for example, it is desirable that (1/2) × LC ≦ LS ≦ (3/4) × LC. That is, the position of the first end portion ES1 on the second direction DR2 side (9 o'clock side) of the pressing suppression surface 62 is a position that is more than half of the case (back cover), and is a position that is 3/4 or less. It is desirable to be.

  Note that the lengths LS and LC are the lengths of the pressure suppression surface 62 (press suppression portion) in the second direction DR2 at the position PS of the convex portion 40. Specifically, when ML is a line perpendicular to the center line CL and passing through the position PS of the convex portion 40, LS is the length of the pressure suppression surface 62 on the line ML, and LC is This is the length of the housing surface 22 (back cover) on this line ML.

  Further, the direction opposite to the second direction DR2 is defined as a third direction DR3, and from the position PS of the convex portion 40 to the first end ES1 on the second direction DR2 side of the pressing suppression surface 62 (pressing suppression portion). Assume that the distance is LE1, and the distance from the position PS of the convex portion 40 to the second end portion ES2 of the pressing suppression surface 62 on the third direction DR3 side is LE2. In this case, LE1> LE2 in FIG.

  In this way, since LE2 is small, the convex portion 40 is disposed at a position close to the second end portion ES2 of the pressing suppression surface 62. Moreover, since LE1 is large, it becomes possible to form the pressure suppression surface 62 that spreads over a long distance from the position of the convex portion 40 toward the first end portion ES1.

  Further, when the width of the pressing suppression surface 62 in the first direction DR1 at the position PS of the convex portion 40 is WS, WS <LE1.

  By doing so, the width WS of the pressure suppression surface 62 in the first direction DR1 is reduced, the first direction DR1 is the short direction, and the second direction DR2 is the long direction. 62 can be formed.

  In addition, 1st, 2nd edge part ES1, ES2 is an edge part of the press suppression surface 62 (press suppression part) on the line ML orthogonal to the centerline CL, for example. LE1 is a distance from the position PS of the convex portion 40 on the line ML to the first end portion ES1, and LE2 is a second end portion from the position PS of the convex portion 40 on the line ML. Distance to ES2. WS is the width of the pressure suppression surface 62 (pressure suppression portion) on a line passing through the position PS of the convex portion 40 and parallel to the center line CL.

  For example, a human arm has a tapered shape that becomes thicker from the hand side toward the elbow side, and the arm diameter changes more on the elbow side than on the hand side.

  In this regard, in the present embodiment, as shown in FIG. 13, the convex portion 40 (pulse wave sensor) is provided in the first region RG1, which is a region on the hand side (3 o'clock direction in the case of wearing the left hand). Therefore, it is easy to sit down when the biological information detecting device is worn on the wrist, and the wearing feeling is excellent. In addition, since the arm has a tapered shape as described above, the change in the diameter of the arm is less when the convex portion 40 is arranged in the first region RG1, so that there is less change in pressing, resulting in a pulse wave detection signal. Noise to be superimposed is reduced, and the MN ratio can be improved.

  In addition, as described with reference to FIG. 5B, in the usage range in which the biological information is measured by the biological information detecting device, the inclination in the change characteristic of the pressure against the load can be reduced to minimize the pressure fluctuation. desired. For this reason, as explained in D2 of FIG. 7B, the pressing restraining unit 60 suppresses the pressing that the convex portion 40 gives to the subject, and the pressing concentration at the convex portion 40 is reduced. And in order to raise the effect of such a pressure suppression, it is necessary to enlarge the area of the pressure suppression surface 62 which is a contact surface with a biological body as much as possible.

  In this case, if the contact area of the pressure suppression surface 62 is increased toward the first direction DR1 in FIG. 13, the width WS of the pressure suppression surface 62 increases. However, as shown in FIGS. 12A and 12B, since the ribs and the ulna exist near the wrist, when the width WS of the pressure suppressing surface 62 increases, the pressure suppressing surface 62 becomes the ribs and ulna. Etc. And when such interference arises, the initial press by the convex part 40 demonstrated by D1 of FIG. 6 (B) will be suppressed, and the initial press for exceeding a venous vanishing point will be given with respect to a subject. Will not be able to.

  Therefore, in FIG. 13, the pressing suppression surface 62 is a surface (a surface that expands) extending in the second direction DR2 side, and the contact area with the living body is expanded in the second direction DR2 side. Specifically, the pressing suppression surface 62 has a pseudo elliptical shape (track shape) with the second direction DR2 as the major axis direction. That is, between the distance LE1 from the position PS of the convex portion 40 to the first end portion ES1 and the distance LE2 from the position PS of the convex portion 40 to the second end portion ES2, as described above, LE1> The relationship LE2 is established, and the relationship WS <LE1 or WS <LE1 + LE2 is established between the width WS of the pressure suppression surface 62 and LE1 and LE2.

  In this way, by reducing the width WS, the interference between the pressure suppression surface 62 and the radius or the ulna is suppressed, and the initial pressing by the convex portion 40 is sufficiently ensured (D1 in FIG. 6B). By increasing the contact area of the pressing suppression surface 62 in the second direction DR2 side, the pressing of the convex portion 40 is suppressed (D2 in FIG. 7B), and the pressing fluctuation in the usage range is minimized. It becomes possible to suppress. That is, it is possible to achieve both sufficient initial pressing by the convex portion 40 and suppression of pressing fluctuation in the usage range, and it is possible to reduce the noise component and ensure a sufficient MN ratio. .

  In this case, if the length of the pressure suppression surface 62 in the second direction DR2 is too long in order to secure the contact area, a location far from the convex portion 40 (for example, the first end portion ES1 on the lower arm side). The muscles, tendon movements, arm diameter changes, etc. are transmitted to the convex portion 40 (pulse wave sensor). Thereby, a pressure fluctuation occurs in the convex portion 40, and as a result, the body movement noise is more largely superimposed.

  Therefore, in FIG. 13, the pressure suppression surface 62 is a surface that extends from the position of the convex portion 40 in the second direction DR2 beyond the center line CL, but the length of the pressure suppression surface 62 in the second direction DR2. A relationship of LS <LC is established between the length LS and the length LC of the housing surface 22. More preferably, the relationship of (1/2) × LC ≦ LS ≦ (3/4) × LC is satisfied. In this way, if the length LS in the second direction DR2 of the pressure suppression surface 62 is suppressed to a certain length, the movement of muscles, tendons, and the like at a location far from the convex portion 40 is caused in the convex portion 40. It is possible to effectively suppress the situation where the body motion noise is superimposed on the situation.

  Further, in the present embodiment, as shown in FIG. 14, the extension portion of the pressing suppression surface 62 toward the second direction DR2 is inclined with respect to the housing surface 22 (case bottom surface).

  For example, in FIG. 14, a position that is separated from the position PS of the convex portion 40 by the first distance LP1 in the second direction DR2 (predetermined direction in a broad sense) is defined as the first position PP1, and the first position PP1 from the position PS of the convex portion 40. A position separated by a second distance LP2 longer than the first distance LP1 in the second direction DR2 (predetermined direction) is defined as a second position PP2. These first and second positions PP1 and PP2 are positions on the line ML along the second direction DR2 (predetermined direction) in FIG. 13, for example. In addition, the height of the pressure suppression surface 62 in the direction DRH orthogonal to the housing surface 22 at the first position PP1 is HS1, and the height of the pressure suppression surface 62 in the direction DRH at the second position PP2 is HS2. Suppose that Then, in FIG. 14, the relationship of HS1> HS2 is established. Specifically, the pressure suppression surface 62 is inclined so that the height in the direction DRH orthogonal to the housing surface 22 becomes lower from the position PS of the convex portion 40 toward the second direction DR2 (predetermined direction). doing. For example, the angle is in the range of about 3 to 6 degrees. It should be noted that various modifications can be made such as, for example, a step-like change in height, instead of a change in height that changes smoothly as shown in FIG.

  By giving such an inclination, for example, the pressing concentration in the vicinity of the first end ES1 on the second direction DR2 side (9 o'clock side) of the pressing suppressing surface 62 can be suppressed. Thereby, it becomes easy to apply the load to the convex part 40, and it becomes easy to obtain appropriate press. For example, as described above, the arm has a tapered shape. Therefore, for example, when the first end ES1 on the second direction DR2 side is high, the bands 320 and 322 in FIGS. 1A and 1B are tightened to apply a load to the convex portion 40. Even if it tries to apply, the tendency which receives a load in this 1st edge part ES1 will become strong. Therefore, no matter how tightly the bands 320 and 322 are tightened, it is impossible to apply a necessary load to the convex portion 40 (pulse wave sensor), and there is a problem that it is difficult to obtain an appropriate pressure. In this regard, such a problem can be solved by providing an inclination with respect to the pressure suppression surface 62 as shown in FIG.

  15 and 16 are diagrams showing the relationship between the shape of the pressure suppression surface 62, the MN ratio, and the pressure fluctuation. For example, FIG. 15 and FIG. 16 show a case where the pressure suppressing surface 62 has a perfect circle shape when the user performs a grouper action (GP) or a running action (RUN), and an ellipse like this embodiment. It is a comparison diagram of MN ratio and pressure fluctuation with the shape (pseudo ellipse shape, track shape).

  As shown in FIGS. 15 and 16, in the majority of users, the oval-shaped pressure suppression surface 62 expanded to 9 o'clock as shown in FIG. As the ratio increases, the pressure fluctuation decreases.

  For example, when the pressure suppression surface 62 is a perfect circle shape, the contact surface comes into contact with the ribs or the ulna and the initial pressure cannot be sufficiently applied, or the area of the contact surface is reduced, and the convex portion 40 is used in the usage range. There is a possibility that the pressure cannot be sufficiently suppressed.

  In this regard, as in the present embodiment, by enlarging the contact surface in the second direction DR2 side (9 o'clock side), the load fluctuation at the convex portion 40 is reduced and the pressure fluctuation is reduced. As a result, the MN ratio (the magnitude of the power spectrum of the pulse component / the magnitude of the power spectrum of the noise component) representing the quality of the pulse wave detection signal is increased.

  FIG. 17A to FIG. 17C are modified examples of the pressing suppression unit 60. FIG. 17A is a perspective view showing a modified example, FIG. 17B is a top view, and FIG. 17C is a cross-sectional view taken along C-C ′ of FIG.

  In this modified example, the convex portion 40 is provided for the translucent member 30, but the convex portion 40 is provided at a position shifted from the center position of the translucent member 30. Moreover, although the press suppression part 60 is provided in the circumference | surroundings of the convex part 40 through the groove part 42, the shape and structure of the press suppression part 60 (press suppression surface) differ from FIG. 13, FIG. It has a different shape and structure. For example, in the top view of FIG. 17B, the pressure suppression unit 60 has a donut shape (concentric shape) surrounding the translucent member 30 and the convex portion 40.

  Further, in this modified example, as shown in FIG. 17C, as in FIG. 14, the pressure suppression surface 62 has a height in a direction orthogonal to the housing surface going outward from the position of the convex portion 40. It is inclined so as to become lower. Further, when the height of the convex portion 40 is HA and the height of the pressing suppression portion 60 is HB (height at the highest place), the relationship Δh = HA−HB> 0 is established.

  As described above, various modifications can be made to the shape and structure of the pressing suppression unit 60. For example, when the biological information detection device is to be attached to a part other than the wrist, the convex portion 40 does not necessarily have to be provided in the first region RG1 on the hand side as shown in FIG.

  Further, for example, when an inclination or the like as shown in FIG. 17C is provided, the pressing suppression surface 62 does not have to be a surface that extends from the position of the convex portion 40 toward the second direction DR2. . That is, the predetermined direction, which is the direction in which the inclination is given, is not limited to the second direction DR2. Further, the pressing suppression surface 62 may be a surface that is continuous in at least three directions (first, second, and third directions DR1, DR2, and DR3) around the convex portion 40, and is continuous over the entire periphery (four directions). It is not always necessary to have this surface.

  Moreover, in FIG.4, FIG.13, FIG.14 etc., although the press suppression part 60 is formed by shape | molding the surface of the cover member 20 in bank shape, this embodiment is not limited to this. For example, various modifications such as forming the pressing suppressing portion 60 by a member different from the cover member 20 and disposing the pressing suppressing portion 60 on the housing surface 22 are possible.

6). Translucent Member Next, various examples of the shape and structure of the translucent member 30 will be described.

  As shown in FIG. 18A, the translucent member 30 has a convex portion 40 and a body portion 50. The convex portion 40 is a portion of the translucent member 30 that at least partially protrudes (exposes) toward the subject. In FIG. 18A, the convex portion 40 has a curved shape. Since the contact surface of the translucent member 30 that comes into contact with the skin of the human body is configured by the convex portion 40 having a curved surface, the degree of adhesion of the translucent member 30 to the skin surface is improved. Intrusion of noise light such as light quantity and disturbance light can be prevented. In addition, it is good also considering the convex part 40 as shapes other than a curved surface.

  Further, the body part 50 is provided on the lower side (upper side in the drawing) which is the side opposite to the subject side (detection part side) with respect to the convex part 40. The body part 50 is a main body part of the translucent member 30, and the convex part 40 for contacting the subject is formed using the body part 50 as a main body part.

  In the translucent member 30 (body part 50), the surface on which the convex portion 40 is formed is defined as a first surface, and the surface on the back side of the first surface is defined as a second surface. Then, in FIG. 18 (A), the recessed part 32 is formed in the position (back side of the convex part 40) corresponding to the convex part 40 in the 2nd surface. By forming such a recess 32, the optical path when the incident light to the light receiving unit 140 of FIG. 4 and the emitted light from the light emitting unit 150 pass through the translucent member 30 can be shortened. That is, the substantial thickness of the translucent member 30 can be reduced. Thereby, the light transmittance is increased, and the signal quality can be improved.

  In this embodiment, as shown in FIG. 18A, a groove portion 42 is provided around the convex portion 40. Further, the bottom surface of the groove portion 42 is a surface of the translucent member 30. That is, the bottom surface of the groove 42 is formed by a part of the surface of the translucent member 30 on the subject side. In this way, it is possible to form the groove 42 for improving the MN ratio by effectively utilizing a part of the surface of the translucent member 30. The height of the bottom surface of the groove portion 42 is lower than the height of the pressure suppression surface 62 (the height at the highest end), and the bottom surface of the groove portion 42 is below the pressure suppression surface 62 ( This is the surface on the detection unit side.

  Specifically, the bottom surface of the groove portion 42 becomes the surface of the body portion 50. That is, the bottom surface of the groove portion 42 is formed by a part of the surface of the body portion 50 of the translucent member 30 on the subject side. In this way, the groove portion 42 can be formed by effectively utilizing a part of the surface of the body portion 50 of the translucent member 30.

  Further, as shown by E1 in FIG. 18B, the body portion 50 is formed to extend from the position of the convex portion 40 below the cover member 20 on the housing surface. The pressing suppression surface 62 is formed by the surface of the cover member 20.

  That is, as shown in FIGS. 3 and 4, the back cover of the biological information detecting device is formed by the translucent member 30 and the cover member 20 provided so as to cover the translucent member 30. And the part which is not covered with the cover member 20 among the translucent members 30 becomes a detection window of a pulse wave sensor, and the convex part 40 is formed in this detection window.

  With such a structure, it becomes possible to improve waterproofing performance and the like, for example, a liquid such as water enters the inside of the biological information detection device and suppresses a situation that causes a failure of the detection unit 130 or the like. become able to. That is, if the body portion 50 is cut at, for example, the portion indicated by E2 in FIG. 18B without extending the body portion 50, liquid such as water enters the cut portion. The waterproof performance may be reduced.

  In this regard, in E1 of FIG. 18B, since the body portion 50 extends to the lower side of the cover member 20, there is no liquid intrusion path in the portion indicated by E2, and the waterproof performance and the like are remarkably improved. It can be improved.

  In FIG. 18B, the pressure suppressing surface 62 is formed by effectively utilizing the cover member 20 that covers the body portion 50 of the translucent member 30 that is formed to extend in this manner. By doing so, it is possible to achieve both improvement in waterproof performance and the like and improvement in signal quality by suppressing pressing.

7). In the living body information detection apparatus as in the present embodiment, the surface of the translucent member 30 that comes into contact with the skin that is the subject is a finite area contact surface. In this embodiment, for example, a relatively soft material such as skin is brought into contact with the contact surface of the light-transmitting member 30 of a hard material formed of resin, glass, or the like. Then, from the viewpoint of elastic mechanics, a region that is not in contact with the skin and a region where the contact pressure is weak are generated in the vicinity of the peripheral portion (outer peripheral portion) of the translucent member 30. In addition, even when an external force is applied to the device of the biological information detection apparatus and a moment is generated in the device, the region near the peripheral edge of the contact surface is most likely to float.

  The light passing between the light emitting unit 150, the skin, and the light receiving unit 140 via such a region is likely to generate optical intensity due to a dynamic change in contact state. If such light is incident on the light receiving unit 140, the noise has no correlation with the pulse component.

  Even in a static contact state, signal quality can be degraded. If the skin is not properly in contact, external light that does not originate from the light emitting unit 150 may enter the light receiving unit 140. On the other hand, when the contact pressure is excessive, the pulsating component is less likely to enter the light that has passed through this region by crushing the subcutaneous blood vessel.

  The greater the noise is superimposed, the lower the signal quality of the pulse wave detection signal, and the reliability of measurement data decreases in various biological measurements such as pulse measurement.

  For example, FIG. 19A shows a case where the convex portion 40 (contact surface) of the translucent member 30 gives a small pressure to the subject skin 2, and FIG. 19B shows a case where the pressure is large. ing. When attention is paid to the locations indicated by A1 and A2 in FIGS. 19A and 19B, the contact state between the skin 2 and the convex portion 40 changes due to the change in the pressure. For example, in FIG. 19A, the skin 2 and the convex portion 40 are in a non-contact state or weak contact state at locations A1 and A2, but in FIG. 19B, they are in a contact state. Accordingly, the intensity of light emitted from the light emitting unit 150 and returning to the light receiving unit 140 changes between FIG. 19A and FIG. 19B, and the reliability of the measurement data decreases. 19A and 19B may be interpreted as an enlarged view of the periphery of the recess 32 in the AA ′ cross-sectional view of the biological information detecting device shown in FIG. 3, and with respect to the direction DRH. You may interpret as the projection figure or the layout figure which projected the component parts around the recessed part 32 from the perpendicular direction. In this embodiment, the description will be made with reference to the similar diagrams of FIGS. 19A and 19B, but both diagrams can be interpreted in the same manner.

  For example, FIGS. 20A and 20B are diagrams illustrating Hertz's elastic contact theory. E is the skin Young's modulus, v is the skin Poisson's ratio, F is the maximum force applied, r is the spherical radius, α is the radius of the contact circle, and σ is the displacement. When predetermined values are substituted into these parameters, and the pressure against the distance from the center of the contact surface is calculated based on Hertz's elastic contact theory, for example, a result as shown in FIG. 20B is obtained. As shown in FIG. 20 (B), when the distance is away from the center of the contact surface, the pressure is reduced. For example, in the portions shown in B1 and B2, the pressure is drastically lowered. Accordingly, in the locations indicated by A1 and A2 in FIGS. 19A and 19B, the pressure on the contact surface changes abruptly due to slight changes in the load, and the reliability of the measurement data is significantly reduced. To do.

  For example, in FIG. 19 (A) and FIG. 19 (B), the contact surface of the translucent member 30 that comes into contact with the skin of the human body is formed by a curved convex shape (convex portion). By doing in this way, since the close_contact | adherence degree of the translucent member 30 with respect to the skin surface improves, invasion of noise lights, such as the reflected light amount from a skin surface, and disturbance light, can be prevented.

  However, as is clear from FIGS. 20A and 20B, the contact pressure with the skin is relatively decreased with respect to the central portion in the convex peripheral portion (outer peripheral portion).

  In this case, if the contact pressure at the central portion is optimized, the contact pressure at the peripheral portion is less than the optimum range. On the other hand, if the contact pressure at the peripheral edge is optimized, the contact pressure at the center is excessive with respect to the optimum range.

  When the contact pressure is less than the optimum range, the pulse wave sensor detects if the pulse wave sensor comes in contact with or away from the skin due to the shaking of the device, or the pulse wave sensor does not crush the veins even if it remains in contact. Body motion noise is superimposed on the signal. If this noise component is reduced, a pulse wave detection signal having a higher M / N ratio (S / N ratio) can be obtained.

  In order to solve the above problems, as shown in FIG. 4, FIG. 21 (A), and FIG. 21 (B), in the present embodiment, aperture portions 80 and 82 (apertures) are provided. The diaphragms 80 and 82 squeeze light from the subject in the optical path between the subject and the detection unit 130. In FIG. 4 and the like, the detection unit 130 includes a light emitting unit 150 that emits light to the subject, and the translucent member 30 transmits light from the light emitting unit 150. The diaphragms 80 and 82 squeeze the light from the light emitting unit 150 in the optical path between the subject and the detection unit 130. The reflector 152 is for reflecting the light emitted from the light emitting unit 150 to increase the light use efficiency.

  As described above, in this embodiment, the diaphragm portions 80 and 82 are provided so that light (stray light) is not detected at the places indicated by A1 and A2 in FIGS. 21 (A) and 21 (B). Squeezed. For example, the light passing through the central portion (for example, the apex of the convex portion) of the light-transmitting region of the light-transmitting member 30 that has been optimally pressed is transmitted without blocking as much as possible, while the light-transmitting region ( For example, light passing through the vicinity of the peripheral edge of the convex portion is blocked. For example, in FIGS. 21A and 21B, by providing the diaphragm unit 80, light at a location indicated by A1 that is the peripheral portion is not incident on the light receiving unit 140. In addition, by providing the diaphragm unit 82, the light from the light emitting unit 150 is prevented from being emitted to the place indicated by A2. That is, in this embodiment, light is focused at a place where the contact state changes due to a change in pressure (load). In this way, even when the contact state changes at the locations indicated by A1 and A2 as shown in FIGS. 21A and 21B, the light state at the locations indicated by A1 and A2 is received. The result will not be affected. Therefore, the reliability of measurement data can be improved.

  Further, in FIGS. 4, 21 </ b> A, 21 </ b> B, etc., a light shielding unit 100 (light shielding wall) is provided between the light receiving unit 140 and the light emitting unit 150. The light shielding portion 100 is, for example, a light shielding wall formed to extend in a direction DRH orthogonal to the housing surface 22 (see FIGS. 3 and 4). Specifically, for example, the light shielding unit 100 having a wall surface along a direction intersecting (orthogonal) with respect to a line segment connecting the center position of the light receiving unit 140 and the center position of the light emitting unit 150 is provided. By providing such a light shielding unit 100, direct light from the light emitting unit 150 is prevented from entering the light receiving unit 140, and the reliability of measurement data and the like can be further improved.

  That is, the closer the distance between the light receiving unit 140 and the light emitting unit 150 is, the more optical efficiency and performance is improved. For example, optical efficiency and performance deteriorate in inverse proportion to the square of the distance. Therefore, it is desirable to make the distance between the light receiving unit 140 and the light emitting unit 150 as close as possible.

  However, when the distance between the light receiving unit 140 and the light emitting unit 150 is reduced, the possibility that the direct light from the light emitting unit 150 is incident on the light receiving unit 140 and the performance deteriorates increases.

  Therefore, the light shielding unit 100 is provided between the light receiving unit 140 and the light emitting unit 150 to prevent direct light from the light emitting unit 150 from entering the light receiving unit 140. In other words, in the present embodiment, as described above, the diaphragm portions 80 and 82 are provided in order to remove an adverse optical effect from the path where the contact state of the contact surface with the subject becomes unstable. On the other hand, the light shielding unit 100 removes adverse effects of the light emitting unit 150 caused by direct light. In this way, the optical parts of the photoelectric pulse wave sensor are configured by the diaphragm portions 80 and 82 that remove noise due to the change in the contact state of the contact surface with the subject, and the light shielding portion 100 that removes direct light from the light emitting portion 150. It is possible to ensure a stable stability. In addition, about the light-shielding part 100, it can also be set as the structure which does not provide this.

  In FIGS. 4, 21 </ b> A, 21 </ b> B, and the like, the diaphragm portions 80 and 82 are provided between the translucent member 30 and the detection unit 130 (the light receiving unit 140 and the light emitting unit 150). . For example, the diaphragms 80 and 82 are arranged and set at positions away from the translucent member 30 and the detection unit 130. As described above, if the apertures 80 and 82 are arranged between the light transmitting member 30 and the detection unit 130, stray light is effectively blocked by the apertures 80 and 82 on the optical path between the subject and the detection unit 130. Thus, it is possible to effectively suppress the situation where noise due to the stray light is superimposed on the measurement data. However, the arrangement forming method of the diaphragm portions 80 and 82 is not limited to this, and various modifications can be made. The diaphragm portions 80 and 82 are disposed between the light transmitting member 30 and the subject or the light transmitting member 30. It may be provided inside.

  For example, in FIG. 22A, the aperture portions 80 and 82 are provided between the translucent member 30 and the detector 130, but the aperture portions 80 and 82 are arranged so as to be in close contact with the translucent member 30. Is formed. In FIG. 22B, diaphragm portions 80 and 82 are arranged and formed in the translucent member 30 (in the material). In FIG. 22C, diaphragm portions 80 and 82 are disposed and formed between the subject and the translucent member 30. Thus, various modes can be envisaged as the arrangement forming method of the aperture portions 80 and 82.

  Further, the manufacturing method of the aperture portions 80 and 82 is not limited to the method of forming the diaphragm members 80 and 82 separately from the translucent member 30 and the like as shown in FIGS. 4, 21 (A), and 21 (B). Can be adopted. For example, when the aperture portions 80 and 82 are formed so as to be in close contact with the translucent member 30 as shown in FIGS. 22A and 22C, the aperture portions 80 and 82 are applied by a technique such as painting, vapor deposition, or printing. May be formed. Alternatively, when the aperture portions 80 and 82 are formed in the translucent member 30 as shown in FIG. 22B, the aperture portions 80 and 82 may be formed by a technique such as insert molding.

  In the present embodiment, the diaphragm portions 80 and 82 and the light shielding portion 100 may be integrally formed as the light shielding member 78. That is, the diaphragm portions 80 and 82 and the light shielding portion 100 (light shielding wall) are integrated. FIG. 23 is a perspective view showing an example of the light shielding member 78 integrally formed in this way.

  As shown in FIG. 23, the light blocking member 78 includes a diaphragm unit 80 (first diaphragm unit) provided on the light receiving unit side and a diaphragm unit 82 (second diaphragm unit) provided on the light emitting unit side. And are formed. A diaphragm opening 81 on the light receiving unit side is formed corresponding to the diaphragm unit 80 on the light receiving unit side, and a diaphragm opening 83 on the light emitting unit side is formed corresponding to the diaphragm unit 82 on the light emitting unit side. ing. Between the aperture portions 80 and 82, a light shielding portion 100 is formed integrally with the aperture portions 80 and 82. For example, the light shielding member 78 has a shape of a bottomed cylindrical portion having a bottom portion formed on one end side and opened on the other end side, and the bottom portions of the bottomed cylindrical portion are formed as throttle portions 80 and 82. Openings 81 and 83 that function as apertures are formed in the throttle portions 80 and 82 that are the bottom portions. Further, the light shielding portion 100 is formed so that the opening region on the other end side of the bottomed cylindrical portion is divided into two (divided).

  As shown in FIG. 23, the light-shielding portion 100 has a small thickness at the central portion 102 thereof. By doing so, the distance between the light receiving unit 140 and the light emitting unit 150 can be made closer, and the optical efficiency and performance can be improved.

  Further, the height of the light-shielding portion 100 in the direction DRH (see FIG. 5A) orthogonal to the housing surface 22 (see FIGS. 3 and 4) of the biological information detecting device is set to H1, and the diaphragm portions 80 and 82 are detected. It is assumed that the height of the lower surface that is the surface on the part 130 side is H2. These heights H1 and H2 are heights from a reference plane (for example, the substrate 160). In this case, the relationship of H1> H2 is established. That is, the light shielding portion 100 is a light shielding wall that extends to a position higher than the lower surfaces of the aperture portions 80 and 82. By doing so, it is possible to suppress a situation in which light from the light emitting unit 150 is reflected by the diaphragm units 80 and 82 and is incident on the light receiving unit 140. That is, it becomes possible to remove the influence of the directly reflected light of the light emitting unit 150, and it is possible to suppress a decrease in reliability of measurement data.

  The light blocking member 78 is attached to the substrate 160 from above the substrate 160 on which the light receiving unit 140 and the light emitting unit 150 are mounted (the direction opposite to DRH) (see FIG. 5A). That is, the light-shielding member 78 is attached so that the substrate 160 on which the light-receiving unit 140 and the light-emitting unit 150 are mounted is inserted into the opening region on the other end side of the bottomed cylindrical part shape of the light-shielding member 78. Projection portions 86 and 88 are formed on the light shielding member 78, and the projection portions 86 and 88 are fitted into holes formed in the substrate 160, so that the light shielding member 78 is attached to the substrate 160. It is fixed against. Thereby, for example, the diaphragm portions 80 and 82, the light shielding portion 100, the light receiving portion 140, and the light emitting portion 150 are arranged at positions corresponding to the concave portions 32 on the back side of the translucent member 30. In this case, the thickness of the translucent member 30 is thin at the concave portion 32. Therefore, the length of the optical path, which is the passing distance of the light incident on the light receiving unit 140 and the light emitted from the light emitting unit 150, through the translucent member 30 can be shortened. Therefore, attenuation of these lights in the translucent member 30 is reduced, and the amount of transmitted light can be improved.

  In addition, it is desirable that the diaphragm portions 80 and 82 and the light shielding portion 100 are subjected to processing for improving the optical efficiency and performance of the pulse wave sensor. For example, the processing of roughening the surfaces (wall surfaces) of the diaphragm portions 80 and 82 and the light shielding portion 100 is performed to suppress the light reflectance. Alternatively, the surfaces of the diaphragm portions 80 and 82 and the light shielding portion 100 have a moth-eye structure. For example, an uneven structure having a period of several tens to several hundreds of nanometers is formed on the surface to form an antireflection structure. Alternatively, the surface color of the apertures 80 and 82 and the light shielding unit 100 is set to a predetermined color such as black so as to prevent irregular reflection of light. In this way, it is possible to effectively suppress a situation in which the reflected light from the diaphragm portions 80 and 82 and the light shielding portion 100 becomes stray light and becomes a noise component of measurement data.

  As described above, in order to improve the optical efficiency and performance of the pulse wave sensor, it is desirable to minimize the distance between the light receiving unit 140 and the light emitting unit 150. For this reason, it is necessary to make the light-shielding part 100 as thin as possible. In particular, the wall thickness of the light-shielding part 100 is reduced in the central part 102 of the light-shielding part 100 in FIG. 23 (a region intersecting with a line connecting the center position of the light-receiving part 140 and the center position of the light-emitting part 150).

  However, the strength of the single-piece structure of the light-shielding portion 100 having such a thin wall thickness is insufficient. For example, when traveling using a pulse meter or riding a bicycle, a strong impact (for example, about 10G) is applied to the device, and thus strength that can cope with the impact is required.

  Therefore, in FIG. 23, a method is adopted in which the aperture portions 80 and 82 and the light shielding portion 100 are integrated. That is, each of the aperture portions 80 and 82 and the light shielding portion 100 is not realized by a single member, but a light shielding member 78 in which the aperture portions 80 and 82 and the light shielding portion 100 are integrally formed is used as shown in FIG. . With such a light shielding member 78 formed integrally, even if the wall thickness of the light shielding portion 100 is thin, it is possible to ensure the strength to withstand an impact.

  In addition, since the diaphragm portions 80 and 82 and the light shielding portion 100 all coincide with each other in terms of the purpose of optical stabilization, it is easy to share materials. For example, it becomes easy to set the colors of the surfaces of the diaphragm portions 80 and 82 and the light shielding portion 100 to black that does not cause irregular reflection.

  Further, by integrating the aperture portions 80 and 82 and the light shielding portion 100, the assemblability at the time of assembling the components is improved, which contributes to cost reduction. For example, the light shielding member 78 is inserted into the concave portion 32 of the translucent member 30, and the protrusions 86 and 88 of the light shielding member 78 are fitted and fixed to the substrate 160 on which the light receiving unit 140 and the light emitting unit 150 are mounted. Simply complete the assembly of the pulse wave sensor.

  Further, considering the mass productivity of equipment, it is desirable to manufacture the light shielding member 78 by injection molding. However, if the wall thickness of the light shielding portion 100 is too thin, there is a possibility that the resin is not sufficiently filled in the portion of the light shielding portion 100 during injection molding.

  Therefore, in FIG. 23, the area of the opening 83 of the diaphragm 82 on the light emitting unit side is smaller than the area of the opening 81 of the diaphragm 80 (first diaphragm) on the light receiving unit side. .

  In FIG. 23, the wall thickness of the light shielding unit 100 is minimized on a line connecting the center of the light receiving unit 140 and the center of the light emitting unit 150. For example, the wall thickness decreases as the distance from the central portion 102 approaches.

  For example, if the area of the opening 83 on the light emitting portion side is reduced, the paths DP1 and DP2 in FIG. 23 can be set as the resin flow path in the injection molding. Then, by pouring the resin through the path from DP1 to DP3 and the path from DP2 to DP4, the resin can be sufficiently filled, and the light shielding part 100 can be formed from the resin even in the central portion 102 where the wall thickness is thin. . For example, the size of the light emitting unit 150 realized by an LED or the like is generally smaller than the size of the light receiving unit 140 realized by a semiconductor IC of a photodiode or the like. Therefore, even if the area of the opening 83 on the light emitting unit side is reduced, there is not much problem. And by increasing the area of the opening part 81 on the light receiving part side, the light receiving efficiency can be increased, and the performance and the like of the biological information detecting apparatus can be improved.

  If the area of the opening 83 on the light emitting part side is reduced in this way to facilitate the pouring of the resin and the wall thickness at the central part 102 of the light shielding part 100 is reduced, the light receiving part 140 and the light emitting part 150 are obtained. The distance between can be reduced. Thereby, optical efficiency and performance can be improved. That is, it is possible to prevent the resin from being insufficiently filled at the time of injection molding and improve the yield and the like while achieving both the strength of the light shielding unit 100 and the optical efficiency and performance.

8). Overall Configuration of Biological Information Detection Device FIG. 24 is a functional block diagram illustrating an example of the overall configuration of the biological information detection device. 24 includes a detection unit 130, a body motion detection unit 190, a processing unit 200, a storage unit 240, and a display unit 310. Note that the biological information detection apparatus of the present embodiment is not limited to the configuration shown in FIG. 24, and various modifications such as omitting some of the components or adding other components are possible.

  The detection unit 130 detects biological information such as a pulse wave, and includes a light receiving unit 140 and a light emitting unit 150. A pulse wave sensor (photoelectric sensor) is realized by the light receiving unit 140, the light emitting unit 150 and the like. The detection unit 130 outputs a signal detected by the pulse wave sensor as a pulse wave detection signal.

  The body motion detection unit 190 outputs a body motion detection signal that is a signal that changes according to body motion, based on sensor information of various sensors. The body motion detection unit 190 includes, for example, an acceleration sensor 192 as a body motion sensor. The body motion detection unit 190 may include a pressure sensor, a gyro sensor, or the like as a body motion sensor.

  The processing unit 200 performs various signal processing and control processing using the storage unit 240 as a work area, for example, and can be realized by a processor such as a CPU or a logic circuit such as an ASIC. The processing unit 200 includes a signal processing unit 210, a pulsation information calculation unit 220, and a display control unit 230.

  The signal processing unit 210 performs various types of signal processing (filter processing and the like). For example, the signal processing unit 210 performs signal processing on a pulse wave detection signal from the detection unit 130, a body movement detection signal from the body movement detection unit 190, and the like. Do. For example, the signal processing unit 210 includes a body movement noise reduction unit 212. Based on the body motion detection signal from the body motion detection unit 190, the body motion noise reduction unit 212 performs a process of reducing (removing) body motion noise that is noise caused by body motion from the pulse wave detection signal. Specifically, for example, noise reduction processing using an adaptive filter or the like is performed.

  The pulsation information calculation unit 220 performs pulsation information calculation processing based on the signal from the signal processing unit 210 and the like. The pulsation information is information such as the pulse rate. Specifically, the pulsation information calculation unit 220 obtains a spectrum by performing frequency analysis processing such as FFT on the pulse wave detection signal after the noise reduction processing in the body motion noise reduction unit 212, and obtains the spectrum. In FIG. 5, processing is performed in which a representative frequency is a heartbeat frequency. A value obtained by multiplying the obtained frequency by 60 is a commonly used pulse rate (heart rate). Note that the pulsation information is not limited to the pulse rate itself, and may be other various information (for example, the frequency or cycle of the heartbeat) representing the pulse rate, for example. Moreover, the information which represents the state of pulsation may be sufficient, for example, it is good also considering the value showing the blood volume itself as pulsation information.

  The display control unit 230 performs display control for displaying various information and images on the display unit 310. For example, as shown in FIG. 1A, control is performed to display various information such as pulse information such as a pulse rate and time information on the display unit 310. Moreover, you may provide the alerting | reporting device which performs the output which stimulates perception of users, such as light, a sound, or a vibration, instead of the display part 310. FIG. As such a notification device, for example, an LED, a buzzer, or a vibrator can be assumed.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configuration and operation of the biological information detection apparatus are not limited to those described in the present embodiment, and various modifications can be made.

2 skin, 10 back cover, 20 cover member, 22 housing surface, 24 screw hole,
26 terminal hole part, 30 translucent member, 32 concave part, 40 convex part, 42 groove part,
50 body portion, 60 pressure suppressing portion, 62 pressure suppressing surface, 78 light shielding member,
80, 82 Aperture part, 100 Light-shielding part, 81, 83 Opening part,
86, 88 Projection part, 100 Light shielding part, 102 Center part,
130 detector, 140 light receiver, 150 light emitter, 152 reflector,
160 substrate, 190 body motion detector, 192 acceleration sensor,
200 processing unit, 210 signal processing unit, 212 body movement noise reduction unit,
220 beat information calculation unit, 230 display control unit, 240 storage unit,
300 body, 310 display, 320, 322 bands,
330, 332 telescopic part, 340 connecting part, 342 fixing member, 343 indicator,
344 Slide member, 350, 352 Spring,
400 wrists, 410 hands, 420 lower arms

Claims (12)

A detection unit having a light receiving unit for receiving light from the subject;
A convex portion that is provided on a body surface side that comes into contact with the subject of the biological information detection device, transmits light from the subject, and touches the subject to apply pressure when measuring biological information of the subject. A translucent member having
A pressure suppressing portion that is provided so as to surround the convex portion on the housing surface, and suppresses the pressure that the convex portion gives to the subject;
Including
A groove is provided between the convex portion of the translucent member and the pressing suppression portion ,
When the amount of change in pressing of the convex portion relative to the load by the load mechanism that generates pressing of the convex portion is set as the amount of change in pressing,
The pressing suppression part is
The pressure change amount in the second load range in which the load of the load mechanism is larger than FL1 is smaller than the pressure change amount in the first load range in which the load of the load mechanism is 0 to FL1. As described above , the biological information detection apparatus is characterized by suppressing the pressure applied to the subject by the convex portion . A detection unit having a light receiving unit for receiving light from the subject;
A convex portion that is provided on a body surface side that comes into contact with the subject of the biological information detection device, transmits light from the subject, and touches the subject to apply pressure when measuring biological information of the subject. A translucent member having
A pressure suppressing portion that is provided so as to surround the convex portion on the housing surface, and suppresses the pressure that the convex portion gives to the subject;
Including
A groove is provided between the convex portion of the translucent member and the pressing suppression portion ,
The pressing suppression portion has a pressing suppression surface that spreads outward from the periphery of the convex portion,
A position that is separated from the position of the convex portion by a first distance in the predetermined direction as a first position, and a position that is separated from the position of the convex portion by a second distance that is longer than the first distance in the predetermined direction. Is the second position, the height of the pressure suppression surface in the direction perpendicular to the housing surface at the first position is HS1, and the height at the second position is perpendicular to the housing surface. The biological information detection apparatus according to claim 1, wherein HS <b>1> HS <b> 2 when the height of the pressing suppression surface is HS <b> 2 . A detection unit having a light receiving unit for receiving light from the subject;
A convex portion that is provided on a body surface side that comes into contact with the subject of the biological information detection device, transmits light from the subject, and touches the subject to apply pressure when measuring biological information of the subject. A translucent member having
A pressure suppressing portion that is provided so as to surround the convex portion on the housing surface, and suppresses the pressure that the convex portion gives to the subject;
Including
A groove is provided between the convex portion of the translucent member and the pressing suppression portion ,
The pressing suppression portion has a pressing suppression surface that spreads outward from the periphery of the convex portion,
The biological information detection apparatus , wherein the pressure suppression surface is inclined so that a height in a direction orthogonal to the housing surface decreases from a position of the convex portion toward a predetermined direction . A detection unit having a light receiving unit for receiving light from the subject;
A convex portion that is provided on a body surface side that comes into contact with the subject of the biological information detection device, transmits light from the subject, and touches the subject to apply pressure when measuring biological information of the subject. A translucent member having
A pressure suppressing portion that is provided so as to surround the convex portion on the housing surface, and suppresses the pressure that the convex portion gives to the subject;
Including
A groove is provided between the convex portion of the translucent member and the pressing suppression portion ,
The translucent member is
The convex part protruding at least partially on the subject side;
A body portion provided on the lower side which is the opposite direction side to the subject side with respect to the convex portion,
The bottom surface of the groove portion is a surface of the body portion,
The body portion is formed to extend from the position of the convex portion to the lower side of the cover member of the housing surface, and the pressure suppression surface of the pressure suppression portion is a surface of the cover member. Information detection device. In any one of Claims 1 thru | or 4 ,
The casing including the detection unit is provided with a substrate on which the detection unit is mounted, the height of the convex portion in the direction orthogonal to the substrate, the height of the pressing suppression portion, and the height of the bottom surface of the groove portion. , Wherein HA>HB> HC, where HA>HB> HC. In claim 5 ,
The biological information detecting apparatus, wherein Δh2> 0.5 mm, where Δh2 is a difference between the height HA of the convex portion and the height HC of the bottom surface of the groove portion. In any one of Claims 1 thru | or 6 .
The biological information detecting device according to claim 1, wherein the groove is provided over the entire periphery of the convex portion. In any one of Claims 1 thru | or 7 ,
The biological information detection apparatus according to claim 1, wherein a bottom surface of the groove is a surface of the translucent member. In any one of Claims 1 thru | or 8 .
Light from the subject provided in an optical path between the light transmitting member and the detection unit, between the light transmitting member and the subject, or in the light transmitting member, and between the subject and the detection unit. A biological information detection device comprising a diaphragm portion for narrowing down the body. In any one of Claims 1 thru | or 9 ,
The detection unit includes a light emitting unit that emits light to the subject,
The translucent member transmits light from the light emitting unit,
A light shielding part provided between the light receiving part and the light emitting part,
Furthermore, the biological information detection apparatus characterized by including. In any one of Claims 1 thru | or 10 .
The living body information detecting apparatus, wherein the convex portion has a curved surface shape at least in a portion in contact with the subject. In any one of Claims 1 thru | or 11 ,
A biological information detecting apparatus for detecting a pulse wave as the biological information.

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