Patent Publication Number: US-2019192004-A1

Title: Biological information measuring apparatus and biological information detection sensor

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2017-247754, filed Dec. 25, 2017, the entirety of which is herein incorporated by reference. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a biological information measuring apparatus and biological information detection sensor. 
     2. Related Art 
     In related art, measuring apparatuses that can measure biological information including pulse wave of living bodies. As the measuring apparatus, a measuring apparatus including a sensor having a light emitting part that emits light to a living body and a light receiving part that receives the light reflected by the living body, a substrate on which the sensor is mounted, a contact part that suppresses direct contact of the sensor with the living body, and a partition member is known (for example, Patent Document 1 (JP-A-2017-148139)). 
     In the measuring apparatus disclosed in Patent Document 1, the partition member suppresses reception of other light (e.g. reflected light from the living body surface) than the light from inside of the living body when the light receiving part receives the light from inside of the living body. The partition member has a sensor contact surface with an area to be in contact with the upper surface of the sensor, a living body contact surface to be in contact with the living body at measurement, and a light shielding surface that shields passing of the light. 
     Here, when the distance from the living body to the light receiving part is longer for the reflected light, there is a problem that the reflected light is attenuated and the amount of light received by the light receiving part is smaller. For example, in the measuring apparatus disclosed in Patent Document 1, the living body contact surface in the partition part in which the sensor contact surface is in contact with the upper surface of the sensor comes into contact with the living body at the measurement of biological information, and the distance tends to be longer and the amount of light received by the light receiving part tends to be smaller. When the amount of light received by the light receiving part becomes smaller, another problem that detection accuracy of the biological information becomes lower arises. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide a biological information measuring apparatus and biological information detection sensor in which detection accuracy of biological information may improved. 
     A biological information measuring apparatus according to a first aspect of the invention includes a housing having a contact part to be in contact with a body of a user, a light emitting part that emits light toward the body of the user, a light receiving part that receives reflected light reflected by the body of the user, a processing unit that processes a signal from the light receiving part and determines biological information, and a optically transparent member placed in the contact part and transmitting the light emitted by the light emitting part and the light to be entered into the light receiving part, wherein the light emitting part and the light receiving part are placed on the optically transparent member. 
     According to the configuration, the light emitting part and the light receiving part are placed on the optically transparent member provided in the contact part to be in contact with the body of the user in the housing and transmitting the light emitted by the light emitting part and the light to be entered into the light receiving part. Thereby, compared to the configuration of Patent Document 1, the distances between the optically transparent member and the light emitting part and light receiving part can be made shorter. Accordingly, attenuation of the light emitted from the light emitting part to the body of the user and attenuation of the light reflected by the body of the user and received by the light receiving part can be suppressed. Therefore, detection and measurement accuracy of the biological information by the biological information measuring apparatus can be improved and precision of the measured biological information can be improved. 
     Further, the distances between the optically transparent member and the light emitting part and light receiving part can be made shorter, and thereby, the biological information measuring apparatus can be made thinner. 
     In the first aspect, it is preferable that the optically transparent member has a first surface that can be in contact with the body of the user, and a second surface opposed to the first surface, on which the light emitting part and the light receiving part are placed. 
     Note that the second surface opposed to the first surface is an opposite surface to the first surface. Further, the optically transparent member may be a plate-like member and the plate-like member includes a member with at least one of the first surface and the second surface formed in a curved surface shape. 
     According to the configuration, the light emitting part and the light receiving part are placed on the second surface opposed to the first surface to be in contact with the user in the optically transparent member. Thereby, exposure of the light emitting part and the light receiving part outside of the housing can be reliably suppressed. Therefore, the light emitting part and the light receiving part can be protected. 
     Further, the first surface can be in contact with the body of the user, and thereby, the distance between the optically transparent member and the body of the user can be made shorter. Accordingly, the optical path length of the light reaching the body of the user from the light emitting part and the optical path length of the light reaching the light receiving part from the body of the user can be made shorter, and the above described attenuation of the lights can be further suppressed. Therefore, the measurement accuracy of the biological information by the biological information measuring apparatus can be further improved, and the precision of the measured biological information can be further improved. 
     In the first aspect, it is preferable that the optically transparent member has a convex portion projecting in a direction from the second surface toward the first surface and overlapping with the light emitting part as seen along a direction from the first surface toward the second surface. 
     According to the configuration, the convex portion overlapping with the light emitting part can be allowed to function as a convex lens that acts on the light emitted from the light emitting part. Accordingly, the light emitted from the light emitting part can be diffused by the lens effect of the convex portion. Therefore, the light emitted from the light emitting part can be efficiently output to the body of the user and the measurement accuracy of the biological information can be improved. 
     In the first aspect, it is preferable that the optically transparent member has a concave portion recessed in a direction from the first surface toward the second surface and overlapping with the light receiving part as seen along the direction from the first surface toward the second surface. 
     According to the configuration, the concave portion overlapping with the light receiving part can be allowed to function as a concave lens that acts on the light entered into the light receiving part. Accordingly, the light reflected by the body of the user and diffused can be collected in the light receiving part by the lens effect of the concave portion. Therefore, the light can be efficiently entered into the light receiving part and the measurement accuracy of the biological information can be improved. 
     In the first aspect, it is preferable that a connecting part that connects the processing unit and the second surface is provided, and the second surface has an electrode pattern that electrically connects the connecting part and the light emitting part and light receiving part. 
     Note that the electrode pattern can be formed on the second surface by e.g. evaporation or pattern printing of a conducting material. 
     According to the configuration, electric power can be supplied to the light emitting part and the detection signal can be transmitted from the light receiving part using the electrode pattern located on the second surface. Thereby, compared to the case where the power is supplied and the signal is transmitted to the light emitting part and the light receiving part via cables, the configuration of the biological information measuring apparatus can be simplified. Therefore, assembly of the sensor can be easily performed and the sensor can be made thinner. 
     Further, the light emitting part and light receiving part and the processing unit can be reliably connected via the connecting part connected to the electrode pattern. 
     In the first aspect, it is preferable that the light emitting part includes a light emitting device that emits light, and a reflection member that covers the light emitting device and has a concave curved surface for reflecting the light entered from the light emitting device toward the body of the user. 
     According to the configuration, the light generated in the light emitting device can be collected and output by the concave curved surface, and effectively radiated to the body of the user. Therefore, use efficiency of the light emitted from the light emitting device can be improved. 
     Further, the reflection member covers the light emitting device, and thereby, entry of part of the light emitted from the light emitting device into a component within the housing can be suppressed. Therefore, deterioration of components due to entry of unnecessary light can be suppressed. 
     In the first aspect, it is preferable that the optically transparent member is one of a glass substrate and a transparent resin. 
     According to the configuration, the glass substrate generally has higher strength and can easily maintain the shape of the optically transparent member even when the optically transparent member is in contact with the body of the user. Further, the glass substrate is generally inexpensive, and rise of the manufacturing cost of the biological information measuring apparatus can be suppressed. 
     Furthermore, the optically transparent member formed using a transparent resin can be manufactured to be relatively light, and thereby, weight increase of the biological information measuring apparatus can be suppressed, and additionally, the optically transparent member can be manufactured using the transparent resin mixed with coloring matter or the like and used as a filter. 
     In the first aspect, it is preferable that the optically transparent member has a shield area provided in a position except a passage area for the light emitted from the light emitting part and the light entering the light receiving part and shielding light. 
     According to the configuration, light is shielded by the shield area, and observation inside of the housing from outside can be suppressed. Therefore, the appearance of the biological information measuring apparatus can be made better. 
     A biological information detection sensor according to a second aspect of the invention is a biological information detection sensor used for a biological information measuring apparatus that measures biological information of a user, including a optically transparent member having a first surface that can be in contact with a body of the user, and a second surface as a surface opposed to the first surface, a light emitting part located on the second surface and emitting light from a side of the second surface to a side of the first surface, and a light receiving part located on the second surface and receiving light traveling from the side of the first surface to the side of the second surface, wherein the optically transparent member has a passage area through which at least the light emitted from the light emitting part and the light entering the light receiving part pass, and a shield area provided in a position except the passage area and shielding light. 
     Note that, as described above, the second surface opposed to the first surface is an opposite surface to the first surface. Further, the optically transparent member can be a plate-like member and the plate-like member includes a member with at least one of the first surface and the second surface formed in a curved surface shape. 
     According to the configuration, the same advantages as those of the biological information measuring apparatus can be offered. That is, in the optically transparent member, the light emitting part and the light receiving part are located on the second surface opposed to the first surface that can be in contact with the body of the user, and the distances between the first surface and the light emitting part and light receiving part can be made shorter. Accordingly, attenuation of the light emitted from the light emitting part to the body of the user and attenuation of the light reaching the light receiving part from the body of the user and received by the light receiving part can be suppressed. Therefore, detection accuracy of the biological information can be improved. Further, the distances between the first surface and the light emitting part and light receiving part (particularly, the distances between the optically transparent member and the light emitting part and light receiving part) can be made shorter, and thereby, the biological information detection sensor can be made thinner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a schematic diagram showing an example of use of a biological information measuring apparatus according to a first embodiment of the invention. 
         FIG. 2  shows an appearance of the biological information measuring apparatus in the first embodiment. 
         FIG. 3  is a rear view showing the biological information measuring apparatus in the first embodiment. 
         FIG. 4  is a block diagram showing a configuration of the biological information measuring apparatus in the first embodiment. 
         FIG. 5  shows a sensor in the first embodiment as seen from an opposite side to a light-exiting side. 
         FIG. 6  shows the sensor in the first embodiment as seen from a side. 
         FIG. 7  shows a sensor of a biological information measuring apparatus according to a second embodiment of the invention as seen from a light-exiting side. 
         FIG. 8  is a schematic diagram showing a sensor of a biological information measuring apparatus according to a third embodiment of the invention. 
         FIG. 9  is a schematic diagram showing optical paths of lights emitted from a light emitting part and optical paths of lights received by a light receiving part of the sensor in the third embodiment. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     First Embodiment 
     As below, the first embodiment of the invention will be explained with reference to the drawings. 
     General Configuration of Biological Information Measuring Apparatus 
       FIG. 1  is a schematic diagram showing an example of use of a biological information measuring apparatus  1 A according to the embodiment. 
     As shown in  FIG. 1 , the biological information measuring apparatus  1 A according to the embodiment (hereinafter, may be abbreviated as “measuring apparatus  1 A”) is a wearable apparatus worn and used on a body of a user US and measuring biological information of the user US. Specifically, the measuring apparatus  1 A is attached to an attached part US 1  such as a wrist of the user US and used, and detects pulse wave of the user US as biological information and measures a pulse rate as biological information. 
       FIG. 2  shows an appearance of the measuring apparatus  1 A. 
     As shown in  FIG. 2 , the measuring apparatus  1 A includes a housing  2 , and bands BN 1  and BN 2  provided on the housing  2 . 
     Note that, in the subsequent drawings including  FIG. 2 , a direction from a front part  21  toward a back part  22  of the housing  2  is referred to as “+Z-direction”. Two directions orthogonal to the +Z-direction are referred to as “+X-direction” and “+Y-direction”, the +X-direction is the nine o&#39;clock direction and the +Y-direction is the twelve o&#39;clock direction as seen from the position facing the front part  21 . Further, an opposite direction to the +Z-direction is referred to as “−Z-direction” (not shown). The same applies to “−X-direction” and “−Y-direction”. 
     The bands BN 1  and BN 2  are connected to end portions on sides in the ±Y-directions of the housing  2 , and the band BN 1  extends toward the side in the +Y-direction and the band BN 2  extends toward the side in the −Y-direction with respect to the housing  2 . These bands BN 1  and BN 2  are coupled to each other by a clasp (not shown), and thereby, the housing  2  is attached to the attached part US 1 . Note that the bands BN 1  and BN 2  may be integrally formed with the housing  2 . 
     The housing  2  has the front part  21 , a back part  22  (see  FIG. 3 ), and a side part  23 . 
     The front part  21  is a part located on the side in the −Z-direction in the housing  2  and can be visually recognized by the user US wearing the measuring apparatus  1 A in the housing  2 . A display part  51  forming an informing unit  5 , which will be described later, is provided nearly at the center of the front part  21 , and the display part  51  is covered by a circular cover  211 . 
     The side part  23  is an annular part formed along the circumferential direction around the +Z-direction, and connects the front part  21  and the back part  22 . Buttons  31 ,  32  forming an operation unit  3 , which will be described later, are placed in a region on the side in the −X-direction in the side part  23 , and buttons  33 ,  34  also forming the operation unit  3  are placed in a region on the side in the +X-direction. The buttons  31  to  34  are buttons projected and recessed relative to the housing  2 . 
       FIG. 3  is a rear view showing the measuring apparatus  1 A, specifically showing the back part  22  of the housing  2 . Note that, in  FIG. 3 , the buttons  31  to  34  are not shown. 
     The back part  22  is a part located on the side in the +Z-direction in the housing  2  and contact part facing a contacted part of the user US and coming into contact with the contacted part (the body of the user US) in the housing  2 . 
     A projecting portion  221  having a nearly annular shape is formed at the center of the back part  22 . A circular opening portion  222  is formed at the center of the projecting portion  221 . Inside of the opening portion  222 , a light emitting part  84  and a light receiving part  85  forming a sensor  8 A, which will be described later, are placed. 
     Configuration of Housing 
       FIG. 4  is a block diagram showing a configuration of the measuring apparatus  1 A. 
     As shown in  FIG. 4 , the measuring apparatus  1 A has the operation unit  3 , a measuring unit  4 , the informing unit  5 , a communication unit  6 , and a processing unit  7  in addition to the housing  2 , and these units are provided in the housing  2 . 
     The operation unit  3  has the above described buttons  31  to  34  and outputs operation signals in response to input of the buttons  31  to  34  to the processing unit (processor)  7 . 
     The measuring unit  4  detects biological information and outputs a detection result to the processing unit  7 . The measuring unit  4  has the sensor  8 A that detects the pulse wave as the biological information, and the sensor  8 A outputs a pulse wave signal (detection signal) as the detection result to the processing unit  7 . Note that the configuration of the sensor  8 A will be described later in detail. 
     The informing unit  5  informs the user of various kinds of information under control by the processing unit  7 . The informing unit  5  has the display part  51 , a sound output part  52 , and a vibrating part  53 . 
     The display part  51  has various display panels of liquid crystal, electronic paper, etc., and displays information input from the processing unit  7 . For example, the display part  51  displays the pulse rate detected and analyzed by the measuring unit  4 . 
     The sound output part  52  outputs sound according to a sound signal input from the processing unit  7 . 
     The vibrating part  53  has a motor that operates under control by the processing unit  7 , and informs the user of e.g. a warning by vibration generated by driving the motor. 
     The communication unit  6  is a communication module that transmits the detected and measured biological information to an external apparatus, and further, outputs information received from the external apparatus to the processing unit  7 . Note that, in the embodiment, the communication unit  6  wirelessly communicates with the external apparatus by the near field communication system, however, may communicate with the external apparatus via a relay device such as a cradle or cable. Alternatively, the communication unit  6  may communicate with the external apparatus via a network. 
     The processing unit  7  is a circuit board having an arithmetic processing circuit and a flash memory, and electrically connected to the operation unit  3 , the measuring unit  4 , the informing unit  5 , and the communication unit  6 . The processing unit  7  executes control processing of controlling the operation of the measuring apparatus  1 A autonomously or according to the operation signal input from the operation unit  3 . In addition, the processing unit  7  controls the operation of the measuring unit  4  (sensor  8 A) to analyze the pulse wave signal indicating the pulse wave as a kind of biological information detected by the measuring unit  4  and determine the pulse rate as a kind of biological information. 
     The processing unit  7  has a memory part  71  formed by the flash memory, and an analysis part  72  formed by the arithmetic processing circuit that executes a program stored in the memory part  71 . 
     The memory part  71  stores various programs and data necessary for the operation of the measuring apparatus  1 A. Further, the memory part  71  stores the pulse wave signal detected by the measuring unit  4  and the pulse rate analyzed by the analysis part  72 . 
     The analysis part  72  analyzes the pulse wave signal input from the measuring unit  4  and determines the pulse rate. Specifically, the analysis part  72  performs a frequency analysis of FFT (Fast Fourier Transform) or the like on the pulse wave signal, extracts the frequency of the pulse from the obtained analysis result (power spectrum), and calculates the pulse rate based on the frequency of the pulse. Note that the analysis part  72  may calculate the pulse rate using another method, not limited to the calculation of the pulse rate. 
     Configuration of Sensor 
       FIG. 5  shows the sensor  8 A as seen from an opposite side to a light-exiting side, in other words, the sensor  8 A as seen from inside of the housing  2 . Further,  FIG. 6  shows the sensor  8 A as seen from a side. 
     The sensor  8 A corresponds to a biological information detection sensor according to the invention. The sensor  8 A is a photoelectric sensor (reflection photoelectric sensor) that emits light (detection light e.g. green light) to the body of the attached part US 1  and detects the light reflected by the body. Specifically, the sensor  8 A detects an intensity change of the detection light as biological information, pulse wave, and outputs the pulse wave signal (detection signal) indicating the detected pulse wave to the processing unit  7  via a connecting part (connector) AM. 
     As shown in  FIGS. 5 and 6 , the sensor  8 A includes a optically transparent member  81 A, and electrode patterns  82 , an electrical circuit  83 , the light emitting part (light emitter)  84 , the light receiving part (light receiver)  85 , and a sealing member  86  respectively located on the optically transparent member  81 A. 
     Configuration of Optically Transparent Member 
     The optically transparent member  81 A contacts with the body surface (e.g. the body surface of the wrist) part of a user US 1 . The optically transparent member  81 A is exposed on the back side of the housing  2  (i.e., on the attached part US 1  side when the measuring apparatus  1 A is attached) via the opening  222  of the housing (see  FIG. 3 ), and the surface on the side in the +Z-direction exposed outside of the housing  2  in the optically transparent member  81 A is a contact surface  81 A 1  (first surface) to be in contact with the body surface. In other words, the opening portion  222  of the housing  2  is closed by the optically transparent member  81 A and the opening portion  222  of the housing  2  (specifically, the inside area of the opening portion  222 ) and the contact surface  81 A 1  overlap in the plan view from the side in the +Z-direction. 
     In the optically transparent member  81 A, a surface opposed to the contact surface  81 A 1  (an opposite surface to the contact surface  81 A 1 ) is a mount surface  81 A 2  (second surface) on which the electrode patterns  82 , the electrical circuit  83 , the light emitting part  84 , and the light receiving part  85  are provided. 
     Further, the optically transparent member  81 A is formed using a light-transmissive material through which light can pass. Specifically, the optically transparent member  81 A is a optically transparent member that can transmit the light emitted from the light emitting part  84  and the light entered into the light receiving part  85 . That is, a passage area TA ( FIG. 6 ) through which light can pass is provided in the optically transparent member  81 A. 
     Note that, in the following description, an example using a glass substrate as the optically transparent member  81 A will be explained. However, the optically transparent member  81 A is not limited to that, but may be another optically transparent member of a resin substrate formed using a transparent resin or sapphire substrate. 
     Configurations of Electrode Patterns and Electrical Circuit 
     A plurality of the electrode patterns  82  are transparent electrodes of transparent conducting films formed on the mount surface  81 A 2 . Specifically, the electrode patterns  82  include electrode patterns  821 ,  822  with one ends connected to the electrical circuit  83  and the other ends connected to a light emitting device  841  of the light emitting part  84 , and electrode patterns  823 ,  824  with one ends connected to the electrical circuit  83  and the other ends connected to the light receiving part  85 . Note that the electrode patterns  82  are not limited to the transparent electrodes, but may be metal films formed by pattern printing or evaporation. 
     The electrical circuit  83  is a part to which an end portion of the connecting part AM is connected. The electrical circuit  83  is formed using an anisotropic conductive film (AFC) placed in contact with the respective electrode patterns  821  to  824 . By the electrical circuit  83 , the respective electrode patterns  821  to  824  and the connecting part AM are electrically connected. 
     Note that, in the embodiment, the connecting part AM is formed using flexible printed circuits (FPC), and an analog circuit AM 1  (see  FIG. 6 ) as an AFE (Analog Front End) is mounted on the connecting part AM. The analog circuit AM 1  has e.g. an amplifier, an A/D converter, and a filter, and outputs a detection signal via the elements to the processing unit  7 . The connecting part AM and the sensor  8 A may be collectively referred to as a sensor module connected to the processing unit  7  as the circuit board. 
     Configuration of Light Emitting Part 
     The light emitting part  84  irradiates the contacted part with detection light, is placed on the mount surface  81 A 2 , and emits light toward the contact surface  81 A 1  side via the optically transparent member  81 A. The light emitting part  84  has the light emitting device  841  and a reflection member (reflector)  842 . 
     The light emitting device  841  is fixed by a bump BP (e.g. gold bump or solder bump) placed on the electrode patterns  821  and  822  with the light emission surface toward the mount surface  81 A 2 , and emits green light toward the mount surface  81 A 2  by the current supplied via the electrode patterns  821  and  822 . Accordingly, the light emitted by the light emitting device  841  passes through the passage area TA of the optically transparent member  81 A and is output from the contact surface  81 A 1  of the optically transparent member  81 A. 
     Note that, in the embodiment, the light emitting device  841  is an LED device, however, may be another light emitting device such as an organic EL device. 
     The reflection member  842  covers the light emitting device  841  on the mount surface  81 A 2 , reflects light not traveling to the body of the user US (e.g. the light emitted toward the side in the −Z-direction) of the lights emitted from the light emitting device  841 , and outputs the light toward the contact surface  81 A 1  side (toward the side in the +Z-direction) of the optically transparent member  81 A via the optically transparent member  81 A. The reflection member  842  is formed in a concave curved shape with one end open, and a concave curved surface  8421  inside is a reflection surface. The opening end is fixed to the mount surface  81 A 2  with the reflection member  842  placed on the mount surface  81 A 2  to cover the light emitting device  841  when the optically transparent member  81 A is seen from the mount surface  81 A 2  side (the side in the −Z-direction). That is, as shown in  FIG. 5 , as seen along the +Z-direction from the mount surface  81 A 2  toward the contact surface  81 A 1  (in other words, as seen from the side in the −Z-direction), the concave curved surface  8421  of the reflection member  842  overlaps with the light emitting device  841 . Further, as shown in  FIG. 6 , in the sectional view as seen along the +Y-direction as the direction orthogonal to the +Z-direction (in other words, when the section along the XZ-plane is seen), the light emitting device  841  is surrounded by the concave curved surface  8421  and the mount surface  81 A 2 . 
     Note that, in the embodiment, at least the reflection surface of the reflection member  842  is formed using a metal. Accordingly, when the reflection member  842  and the electrode patterns  821  and  822  come into contact, short circuit may occur. Concave portions (not shown) for avoiding the electrode patterns  821  and  822  are formed in the opening end of the reflection member  842 , and thereby, the contact between the reflection member  842  and the electrode patterns  821  and  822  is suppressed. 
     Here, the passage area TA includes an area of the optically transparent member  81 A through which the light emitted by the light emitting part  84  passes, i.e., an area in which the light emitting part  84  and the contact surface  81 A 1  or mount surface  81 A 2  overlap in the plan view from the side in the +Z-direction. 
     Configuration of Light Receiving Part 
     The light receiving part  85  receives the light emitted from the light emitting part  84  and reflected by the body of the user US (reflected light) and outputs the pulse wave signal as a signal of the voltage according to the intensity of the received light. The light receiving part  85  is fixed to the mount surface  81 A 2  by the bump BP like the light emitting part  84  with a detection surface  851  that detects the light toward the mount surface  81 A 2 . 
     As described above, the light emitting part  84  and the light receiving part  85  are mounted face-down on the mount surface  81 A 2  of the optically transparent member  81 A as the substrate with the electrode patterns  82  formed thereon. 
     The light receiving part  85  has a color filter  852  and an angle limiting filter  853  that cover the detection surface  851 . 
     The color filter  852  is a filter that transmits light in the same wavelength range as that of the light emitted by the light emitting part  84 , but does not transmit lights having wavelengths in other wavelength ranges. The color filter  852  is provided, and thereby, entry of other light (e.g. outside light) than the reflected light into the detection surface  851  and reduction in detection accuracy of the detection light are suppressed. 
     The angle limiting filter  853  is a filter that transmits light at an incident angle (an angle of incident light relative to the normal of the detection surface  851 ) equal to or smaller than a predetermined value (e.g. 30°) and suppresses transmission of lights at incident angles larger than the predetermined value. The angle limiting filter  853  is provided, and thereby, entry of the light emitted from the light emitting part  84  directly from the light emitting part  84  into the light receiving part  85  is suppressed. 
     Configuration of Sealing Member 
     The sealing member  86  is provided on the mount surface  81 A 2  to cover the light emitting part  84  and the light receiving part  85  and has a function of protecting the light emitting part  84  and the light receiving part  85 . Specifically, the sealing member  86  is formed by a sealing resin provided to cover the light emitting part  84  and the light receiving part  85  placed on the mount surface  81 A 2 . 
     Note that it is preferable that the sealing resin does not exist inside of the reflection member  842  having the concave curved shape forming the light emitting part  84 , however, when the sealing resin is transparent, the sealing resin may fill inside of the reflection member  842 . On the other hand, as the light emitting part  84 , a part filled with a resin between the light emitting device  841  and the inner surface of the reflection member  842  in advance may be employed. 
     Advantages of First Embodiment 
     According to the biological information measuring apparatus  1 A of the above described embodiment, the following advantages may be offered. 
     The biological information measuring apparatus  1 A includes the housing  2  having the back part  22  as the contact part to be in contact with the body of the user US, the light emitting part  84  that emits light toward the body of the user US, the light receiving part  85  that receives the reflected light reflected by the body of the user US, the processing unit  7  that processes the signals from the light receiving part  85  and determines the pulse wave and the pulse rate as the biological information, and the optically transparent member  81 A placed in the back part  22  and transmits the light emitted by the light emitting part  84  and the light entered into the light receiving part  85 . The light emitting part  84  and the light receiving part  85  are placed on the mount surface  81 A 2  of the optically transparent member  81 A. Thereby, compared to the case where the substrate on which the light emitting part and the light receiving part are placed on the surface toward the side in the +Z-direction is placed within the housing, the light emitting part  84  and the light receiving part  85  may be protected, and further, the distances between the optically transparent member  81 A and the light emitting part  84  and light receiving part  85  may be made shorter. Accordingly, attenuation of the light emitted from the light emitting part  84  to the body of the user US and attenuation of the light reflected by the body of the user US and received by the light receiving part  85  may be suppressed. Therefore, detection and measurement accuracy of the pulse wave and the pulse rate by the biological information measuring apparatus  1 A may be improved and precision of the pulse wave and the pulse rate may be improved. Further, the distances between the optically transparent member  81 A and the light emitting part  84  and light receiving part  85  may be made shorter, and thereby, the sensor  8 A may be made thinner and the biological information measuring apparatus  1 A may be made thinner. 
     The optically transparent member  81 A has the contact surface  81 A 1  as the first surface that can be in contact with the body of the user US, and the mount surface  81 A 2  as the second surface opposed to the contact surface  81 A 1 , on which the light emitting part  84  and the light receiving part  85  are placed. Thereby, exposure of the light emitting part  84  and the light receiving part  85  outside of the housing  2  may be reliably suppressed. Therefore, the light emitting part  84  and the light receiving part  85  may be protected. Further, the contact surface  81 A 1  can be in contact with the body of the user US, and thereby, the distance between the optically transparent member  81 A and the body of the user US may be made shorter. Accordingly, the optical path length of the light reaching the body of the user US from the light emitting part  84  and the optical path length of the light reaching the light receiving part  85  from the body of the user US may be made shorter, and the above described attenuation of the lights may be further suppressed. Therefore, the measurement accuracy of the biological information (pulse wave and pulse rate) by the biological information measuring apparatus  1 A may be further improved, and the precision of the measured biological information may be further improved. 
     The measuring apparatus  1 A has the connecting part AM that connects the processing unit  7  and the mount surface  81 A 2 . The mount surface  81 A 2  has the electrode patterns  82  that electrically connect the connecting part AM and the light emitting part  84  and light receiving part  85 . Accordingly, electric power may be supplied to the light emitting part  84  and the detection signal may be transmitted from the light receiving part  85  using the electrode patterns  82  located on the mount surface  81 A 2 . Thereby, compared to the case where the power is supplied and the signal is transmitted to the light emitting part  84  and the light receiving part  85  via cables, the configuration of the measuring apparatus  1 A may be simplified. Therefore, assembly of the sensor  8 A may be easily performed and the sensor  8 A, i.e., the measuring apparatus  1 A may be made thinner. Further, the light emitting part  84  and light receiving part  85  and the processing unit  7  may be reliably connected via the connecting part AM connected to the electrode patterns  82 . 
     The light emitting part  84  has the light emitting device  841  that emits light and the reflection member  842  that covers the light emitting device  841  and has the concave curved surface  8421  reflecting the light entering from the light emitting device  841  toward the body of the user US. Thereby, the light generated in the light emitting device  841  may be effectively radiated to the body of the user US. Therefore, use efficiency of the light generated in the light emitting device  841  may be improved. Further, the reflection member  842  covers the light emitting device  841 , and thereby, entry of part of the light emitted from the light emitting device  841  into a component within the housing  2  may be suppressed. Therefore, deterioration of components due to entry of unnecessary light may be suppressed. 
     The optically transparent member  81 A is the glass substrate. Thereby, the glass substrate generally has higher strength and may easily maintain the shape of the optically transparent member  81 A to be in contact with the body of the user US. Further, the glass substrate is generally inexpensive, and rise of the manufacturing cost of the sensor  8 A, i.e., the measuring apparatus  1 A may be suppressed. 
     Second Embodiment 
     Next, the second embodiment of the invention will be explained. 
     A biological information measuring apparatus according to the embodiment has the similar configuration to the biological information measuring apparatus  1 A shown in the first embodiment, but differs in the configuration of the optically transparent member. Note that, in the following explanation, the same or substantially the same parts as parts that have been already explained will have the same signs and their explanation will be omitted. 
       FIG. 7  shows a sensor  8 B of a biological information measuring apparatus  1 B according to the embodiment as seen from a light-exiting side (back side). In  FIG. 7 , a shield area SA, which will be described later, is hatched. 
     The biological information measuring apparatus  1 B according to the embodiment has the same configuration and function as the above described biological information measuring apparatus  1 A except that the apparatus has the sensor  8 B as a biological information detection sensor in place of the sensor  8 A. Further, as shown in  FIG. 7 , the sensor  8 B has the same configuration and function as the above described sensor  8 A except that the sensor has a optically transparent member  81 B in place of the optically transparent member  81 A. That is, the sensor  8 B is connected to the processing unit  7  as a circuit board that processes the detection signal (pulse wave signal) by the sensor  8 B via the connecting part AM connected to the electrical circuit  83  of the sensor  8 B. 
     The optically transparent member  81 B is formed using a glass substrate like the optically transparent member  81 A exemplified in the first embodiment. The optically transparent member  81 B has a contact surface  81 B 1  (first surface) to be in contact with the contacted part of the user US, and amount surface (not shown in  FIG. 7 ) as a surface opposed to the contact surface  81 B 1  (second surface, an opposite surface to the contact surface  81 B 1 ). On the mount surface of the optically transparent member  81 B, like the mount surface  81 A 2 , the electrode patterns  82  and the electrical circuit  83  are formed, and the light emitting part  84  and the light receiving part  85  are provided to be electrically connected to the electrode patterns  82 . The light emitting part  84  and the light receiving part  85  placed on the mount surface are sealed by the sealing member  86 . 
     Here, the light emitted from the light emitting part  84  located on the mount surface of the optically transparent member  81 B and the light reflected by the body of the user US can pass through the optically transparent member  81 B. However, if the light can pass through the entire surface of the optically transparent member  81 B, the user US can visually recognize inside of the housing  2  and the appearance of the measuring apparatus may be degraded. 
     On the other hand, in the biological information measuring apparatus  1 B according to the embodiment, another area than a passage area TA 1  through which the light emitted from the light emitting part  84  passes in the optically transparent member  81 B and a passage area TA 2  through which the light reflected by the body of the user US and entered into the light receiving part  85  passes is the shield area SA (the hatched area in  FIG. 7 ) through which the light does not pass. Thereby, the sensor  8 B is adapted so that the user may not visually recognize inside of the housing  2 . 
     Note that the shield area SA may be formed, for example, by applying paint that shields light or forming a light-shielding film in the other area than the passage areas TA 1 , TA 2  of the areas exposed from the opening portion  222  of the housing  2  in the contact surface  81 B 1 . 
     Alternatively, a substrate formed using a non-light-transmissive material, in which opening portions according to the passage areas TA 1 , TA 2  are formed may be employed in place of the optically transparent member  81 B. In this case, light-transmissive materials may be placed within the respective opening portions. 
     Advantages of Second Embodiment 
     The biological information measuring apparatus  1 B according to the above described embodiment may offer not only the same advantages as the biological information measuring apparatus  1 A but also the following advantage. 
     The optically transparent member  81 B has the shield area SA for shielding light provided in the position except the respective passage area TA 1  through which the light emitted from the light emitting part  84  passes and passage area TA 2  of the light entered into the light receiving part  85 . Thereby, observation inside of the housing  2  may be suppressed by the shield area SA. Therefore, the appearance of the biological information measuring apparatus  1 B may be made better. 
     Third Embodiment 
     Next, the third embodiment of the invention will be explained. 
     A biological information measuring apparatus according to the embodiment has the similar configuration to the biological information measuring apparatus  1 A shown in the first embodiment, but differs from the biological information measuring apparatus  1 A in that the optically transparent member has a convex portion and a concave portion that function as lenses. Note that, in the following explanation, the same or substantially the same parts as parts that have been already explained will have the same signs and their explanation will be omitted. 
       FIG. 8  is a schematic diagram showing a part of a sensor  8 C of a biological information measuring apparatus  1 C according to the embodiment as seen from the light-exiting side (the side in the +Z-direction), and  FIG. 9  is a schematic diagram showing optical paths of lights emitted from the light emitting part  84  and optical paths of the lights received by the light receiving part  85  of the sensor  8 C. 
     The biological information measuring apparatus  1 C according to the embodiment has the same configuration and function as the above described biological information measuring apparatus  1 A except that the apparatus has the sensor  8 C as a biological information detection sensor in place of the sensor  8 A. Further, as shown in  FIGS. 8 and 9 , the sensor  8 C has the same configuration as the above described sensor  8 A except that the sensor has a optically transparent member  81 C in place of the optically transparent member  81 A. That is, the sensor  8 C is connected to the processing unit  7  as a circuit board that processes the detection signal (pulse wave signal) by the sensor  8 C via the connecting part AM connected to the electrical circuit  83  of the sensor  8 C. 
     The optically transparent member  81 C is formed using a glass substrate like the optically transparent member  81 A, and to be in contact with the contacted part of the user US. That is, the optically transparent member  81 C is a contact member to be in contact with the body of the user. The optically transparent member  81 C has a contact surface  81 C 1  (first surface) that is exposed outside of the housing  2  and can be in contact with the body of the user, and a mount surface  81 C 2  (second surface) as an opposite surface to the contact surface  81 C 1 . 
     Of the surfaces, on the mount surface  81 C 2 , like the mount surface  81 A 2  of the optically transparent member  81 A, the electrode patterns  82  are formed, and additionally, the electrical circuit  83 , the light emitting part  84 , and the light receiving part  85  are placed. Further, on the mount surface  81 C 2 , the sealing member  86  (not shown) that covers the light emitting part  84  and the light receiving part  85  is formed. Note that, in  FIGS. 8 and 9 , the reflection member  842  forming the light emitting part  84  is not shown. 
     The contact surface  81 C 1  comes into contact with a body surface BS (see  FIG. 9 ) of the user like the contact surfaces  81 A 1 ,  81 B 1 . In the contact surface  81 C 1 , a plurality of convex portions  81 C 3  and a plurality of concave portions  81 C 4  are provided. 
     As shown in  FIG. 8 , the plurality of convex portions  81 C 3  are placed in the passage area TA through which the light emitted from the light emitting part  84  passes in the optically transparent member  81 C. Specifically, the plurality of convex portions  81 C 3  are placed adjacent to each other in the positions overlapping with the light emitting device  841  as seen along the −Z direction as the direction from the contact surface  81 C 1  toward the mount surface  81 C 2  of the sensor  8 C. That is, the optically transparent member  81 C has the convex portions  81 C 3  located in the passage area TA of the contact surface  81 C 1  and overlapping with the light emitting part  84  as seen from the side in the +Z-direction. 
     As shown in  FIG. 9 , these convex portions  81 C 3  project in the +Z-direction (the direction from the mount surface  81 C 2  as the second surface toward the contact surface  81 C 1  as the first surface), and respectively function as convex lenses. Further, each convex portion  81 C 3  diffuses the light entered from the light emitting part  84  (light emitting device  841 ). In other words, each convex portion  81 C 3  diffusionally emits the light entered from the light emitting part  84  toward the body surface BS as a part of the body of the user US. 
     Note that  FIGS. 8 and 9  show the example in which the plurality of convex portions  81 C 3  are placed in correspondence with the light emitting device  841 , however, the plurality of convex portions  81 C 3  or the single convex portion  81 C 3  may be provided in the position overlapping with the light emitting device  841  and the reflection member  842  as seen from the side in the +Z-direction. That is, in the contact surface  81 C 1 , it is only necessary that at least one convex portion  81 C 3  is provided within the area through which the light emitted from the light emitting part  84  passes. 
     As shown in  FIG. 8 , the plurality of concave portions  81 C 4  are placed in the passage are TA through which the light entered into the light receiving part  85  from the side in the +Z-direction passes in the optically transparent member  81 C. Specifically, the plurality of concave portions  81 C 4  are placed adjacent to each other in the positions overlapping with the light receiving part  85  as seen along the −Z direction as the direction from the contact surface  81 C 1  toward the mount surface  81 C 2  of the sensor  8 C. That is, the optically transparent member  81 C has the concave portions  81 C 4  located in the passage area TA of the contact surface  81 C 1  and overlapping with the light receiving part  85  as seen from the side in the +Z-direction. 
     As shown in  FIG. 9 , these concave portions  81 C 4  are recessed in the −Z-direction (the direction from the contact surface  81 C 1  as the first surface toward the mount surface  81 C 2  as the second surface), and respectively function as concave lenses. Further, each concave portion  81 C 4  collects the light reflected by the body of the user US in the light receiving part  85 . 
     Note that  FIGS. 8 and 9  show the example in which the plurality of concave portions  81 C 4  are placed in correspondence with the light receiving part  85 , however, the single concave portion  81 C 4  may be provided in a position overlapping with the light receiving part  85  as seen from the side in the +Z-direction. That is, in the contact surface  81 C 1 , it is only necessary that at least one concave portion  81 C 4  is provided within the area through which the light entered into the light receiving part  85  passes. 
     In the embodiment, the plurality of convex portions  81 C 3  and the plurality of concave portions  81 C 4  are respectively integrally formed with the optically transparent member  81 C. However, the portions are not limited to that. For example, the convex portions  81 C 3  and the concave portions  81 C 4  may be provided in the optically transparent member  81 C by placement of a sheet with convex portions and concave portions formed therein on the contact surface  81 C 1  or the like. 
     Advantages of Third Embodiment 
     The biological information measuring apparatus  1 C according to the above described embodiment may offer not only the same advantages as the biological information measuring apparatus  1 A but also the following advantage. 
     The optically transparent member  81 C forming the sensor  8 C has the convex portions  81 C 3  that project in the +Z-direction as the direction from the mount surface  81 C 2  (second surface) toward the contact surface  81 C 1  (first surface) and overlap with the light emitting part  84  as seen along the −Z-direction as the direction from the contact surface  81 C 1  toward the mount surface  81 C 2 . Thereby, the convex portions  81 C 3  may be allowed to function as convex lenses that act on the light emitted from the light emitting part  84 . Accordingly, the light emitted from the light emitting part  84  may be diffused by the lens effect of the convex portions  81 C 3 . Therefore, the light emitted from the light emitting part  84  may be efficiently output to the body of the user US and the measurement accuracy of the pulse wave and the pulse rate as the biological information may be improved. 
     The optically transparent member  81 C forming the sensor  8 C has the concave portions  81 C 4  recessed in the direction from the contact surface  81 C 1  (first surface) toward the mount surface  81 C 2  (second surface) and overlapping with the light receiving part  85  as seen along the −Z-direction as the direction from the contact surface  81 C 1  toward the mount surface  81 C 2 . Thereby, the concave portions  81 C 4  may be allowed to function as concave lenses that act on the light entered into the light receiving part  85 . Accordingly, the light reflected by the body of the user US and diffused may be collected in the light receiving part  85  by the lens effect of the concave portions  81 C 4 . Therefore, the light may be efficiently entered into the light receiving part  85  and the measurement accuracy of the pulse wave and the pulse rate as the biological information may be improved. 
     Further, the convex portions  81 C 3  and the concave portions  81 C 4  are located in the contact surface  81 C 1  to be into contact with the body of the user US in the optically transparent member  81 C. Thereby, drainage of sweat or the like of the optically transparent member  81 C to be in contact with the body surface BS may be improved. 
     Here, in the case where only one convex portion  81 C 3  is provided to overlap with the whole light emitting part  84  as seen from the side in the +Z-direction, the amount of projection of the convex portion  81 C 3  becomes larger and the thickness dimension of the optically transparent member becomes larger. Further, in the case where only one concave portion  81 C 4  is provided to overlap with the whole light receiving part  85  as seen from the side in the +Z-direction, the amount of the recess of the concave portion  81 C 4  becomes larger and, to secure strength, it is necessary to increase the thickness dimension of the optically transparent member. 
     On the other hand, in the embodiment, the plurality of convex portions  81 C 3  respectively overlapping with the light emitting part  84  as seen from the side in the +Z-direction and the plurality of concave portions  81 C 4  respectively overlapping with the light receiving part  85  are provided in the optically transparent member  81 C. Thereby, the amount of the projection of each convex portion  81 C 3  and the the amount of the recess of each concave portion  81 C 4  may be made smaller. Therefore, compared to the case where respective one convex portion  81 C 3  and concave portion  81 C 4  are provided, increase of the thickness dimension of the optically transparent member  81 C may be suppressed. 
     Modifications of Embodiments 
     The invention is not limited to the above described respective embodiments, but the invention includes modifications, improvements, etc. within the range in which the purpose of the invention may be achieved. 
     In the above described respective embodiments, the biological information measuring apparatuses  1 A,  1 B,  1 C are explained as wearable apparatuses attached to the attached part US 1  such as a wrist of the user US and used. However, the attachment part of the biological information measuring apparatus is not limited to the wrist, but may be another part. Further, the sensors  8 A,  8 B,  8 C are not limited to the employment for the biological information measuring apparatuses  1 A,  1 B,  1 C dedicated to the function of measuring biological information, but may have e.g. configurations provided in a wristwatch, band, or the like to output or transmit detection results to an external apparatus. In this regard, the detection results may be transmitted to the external apparatus in wireless or wired connection. 
     In the above described respective embodiments, the sensors  8 A,  8 B,  8 C have the single light emitting parts  84  and the single light receiving parts  85 . However, the sensor is not limited to that, but may have one light emitting part  84  and a plurality of light receiving parts  85 , or a plurality of light emitting parts  84  and one light receiving part  85 . Further, the sensor may have a plurality of sets of at least one light emitting part  84  and at least one light receiving part  85 . 
     In the above described respective embodiments, the light emitting part  84  is placed on the side in the +X-direction with respect to the light receiving part  85 . However, the positions of the light emitting part  84  and the light receiving part  85  are not limited to those, but may be respectively appropriately changed. For example, the light emitting part  84  may be placed on the side in the −X-direction, on the side in the +Y-direction, or on the side in the −Y-direction with respect to the light receiving part  85 . Further, the positions of the light emitting part  84  and the light receiving part  85  within the opening portion  222  formed in the back part  22  may be respectively appropriately changed. For example, one of the light emitting part  84  and the light receiving part  85  may be placed at the center of the opening portion  222 . 
     In the above described respective embodiments, the connecting parts AM connecting the sensors  8 A,  8 B,  8 C and the processing units  7  as the circuit boards are the flexible boards. However, the biological information measuring apparatus is not limited to that, but may have a configuration in which the sensor and the processing unit are connected by a cable or connector or a rigid board. That is, the connection form between the sensor and the processing unit is not limited to that described as above. 
     In the above described respective embodiments, the electrode patterns  82  connecting the electrical circuits  83  and the light emitting parts  84  and light receiving parts  85  are formed on the respective mount surfaces (second surfaces) of the optically transparent members  81 A,  81 B,  81 C. However, the power supply lines and the signal transmission lines connected to the connecting parts AM are not limited to the electrode patterns formed on the mount surface as long as electric power may be supplied to the light emitting part  84  and the detection signal may be transmitted from the light receiving part  85 . For example, the electrical circuit  83  and the light emitting part  84  and light receiving part  85  may be connected by electric wires or the like. That is, the connection form between the electrical circuit  83  and the light emitting part  84  and light receiving part  85  is not limited to those described as above. 
     In the above described respective embodiments, the light emitting part  84  has the light emitting device  841  that emits light and the reflection member  842  that covers the light emitting device  841  as seen from the side in the −Z-direction and reflects the light entered from the light emitting device  841  toward the body of the user US. However, the part is not limited to that, but may have no reflection member  842 . Alternatively, a light-shielding part that shields the light emitted from the light emitting device  841  and suppresses direct entry of the light emitted from the light emitting device  841  into the light receiving part  85  may be provided between the light emitting device  841  and the light receiving part  85 . Further, the configuration of the reflection member is not limited to the reflection member  842  having the concave curved surface, but may be appropriately changed. For example, as the reflection member, a resin film or metal film covering the light emitting device  841  or a white or silver mold member may be employed. As the colors of the respective films and the mold members in this case, white or silver may be exemplified for efficient reflection of incident light. 
     In the above described respective embodiments, the optically transparent members  81 A,  81 B,  81 C are the glass substrates. However, the members are not limited to those, but may be other optically transparent members such as sapphire substrates or resin substrates. 
     Further, the contact surfaces  81 A 1 ,  81 B 1 ,  81 C 1  as the first surfaces in the respective optically transparent members  81 A,  81 B,  81 C do not necessarily come into direct contact with the body of the user US, but may come into contact with the body of the user US via sheets provided on the contact surfaces or layer structures formed on the contact surfaces. That is, it is only necessary that the optically transparent member is provided to face the body of the user US when the sensor detects or measures the biological information. 
     Furthermore, the contact surface as the first surface in the optically transparent member is not necessarily flat, but may be formed in a curved shape that can press the body of the user US. For example, the contact surface may be a convex curved surface toward the body of the user US, i.e., a convex curved surface projecting in the direction in which the light emitted from the light emitting part travels. Similarly, the mount surface as the second surface in the optically transparent member is not necessarily flat. Moreover, the optically transparent member (contact surface) does not necessarily come into contact with the body of the user US. 
     In the above described respective embodiments, the light emitting parts  84  and the light receiving parts  85  are mounted on the mount surfaces of the optically transparent members  81 A,  81 B,  81 C using the bumps BP. However, the mount form of the light emitting part  84  and the light receiving part  85  on the mount surface is not limited to that described as above. 
     The sensors  8 A,  8 B,  8 C have the sealing members  86  formed using the sealing resins and covering the light emitting parts  84  and the light receiving parts  85 . However, the sensor is not limited to that, but may have no sealing member  86 . Note that, with the sealing members  86 , strengths of the sensors  8 A,  8 B,  8 C (strengths of the optically transparent members  81 A,  81 B,  81 C) may be made higher and the optically transparent members  81 A,  81 B,  81 C may be made thinner. In addition, total reflection of the light entered into the light receiving part  85  may be suppressed, and thus, the amount of light received by the light receiving part  85  may be increased. 
     In the above described respective embodiments, the analog circuits AM 1  as AFEs are mounted on the connecting parts AM. However, the analog circuits AM 1  are not limited to those, but, for example, may be provided on or supported by the mount surfaces (second surfaces) of the optically transparent members  81 A,  81 B,  81 C or provided on or supported by the processing units  7  as the processing boards. That is, the analog circuits AM 1  may be included in the sensors  8 A,  8 B,  8 C or not. 
     In the above described first embodiment, the contact surface  81 A 1  as the first surface of the optically transparent member  81 A in the sensor  8 A is nearly flat and the passage area TA is provided on the entire optically transparent member  81 A. In the above described second embodiment, the passage areas TA 1 , TA 2  are provided in correspondence with the light emitting part  84  and the light receiving part  85  on the contact surface  81 B 1  as the first surface of the optically transparent member  81 B in the sensor  8 B, and the area except the passage areas TA 1 , TA 2  is the shield area SA. In the above described third embodiment, the contact surface  81 C 1  as the first surface of the optically transparent member  81 C in the sensor  8 C has at least one convex portion  81 C 3  overlapping with the light emitting part  84  as seen from the side in the +Z-direction and at least one concave portion  81 C 4  overlapping with the light receiving part  85  as seen from the side in the +Z-direction. The configurations shown in these embodiments may be combined with one another. For example, at least one convex portion  81 C 3  or concave portion may be placed in the passage area TA 1  of the optically transparent member  81 B, at least one concave portion  81 C 4  or convex portion is placed in the passage area TA 2 , and the other area than the passage areas TA 1 , TA 2  may be the shield area SA. Alternatively, as will be described later, the convex portion or concave portion placed in the passage areas TA 1 , TA 2  are not limited to be located on the contact surface of the optically transparent member, but may be located on the mount surface as the second surface. 
     In the above described third embodiment, the convex portion  81 C 3  diffuses and outputs the light entered from the light emitting part  84  and the concave portion  81 C 4  collects the light reflected by the body of the user US in the light receiving part  85 . However, the portions are not limited to those, but at least one concave portion  81 C 4  overlapping with the light emitting part  84  may be placed and at least one convex portion  81 C 3  overlapping with the light receiving part  85  may be placed as seen from the side in the +Z-direction. Further, in the passage areas TA, TA 1 , TA 2 , a convex portion or concave portion overlapping with the light emitting part  84  may be placed and a convex portion or concave portion overlapping with the light receiving part  85  may be placed on the mount surface of the optically transparent member. Alternatively, none of a convex portion and a concave portion is placed on one of the light emitting part  84  and the light receiving part  85 . In the case where a concave portion overlapping with the light emitting part  84  as seen from the side in the +Z-direction is placed, the light may be collected on the body of the user US. 
     In the above described respective embodiments, the sensors  8 A,  8 B,  8 C detect the pulse wave as one kind of the biological information and the processing units  7  determine and analyze the pulse rates as another kind of the biological information based on the detection signals (pulse wave signals) by the sensors  8 A,  8 B,  8 C. That is, the biological information measuring apparatuses  1 A,  1 B,  1 C measure the pulse wave and the pulse rates. However, the biological information that can be measured by the biological information measuring apparatus according to the invention is not limited to that. For example, the biological information measuring apparatus may measure an amount of activity, calorie consumption, the maximum oxygen intake (VO 2 max) based on the detection results by the sensor. 
     Further, the biological information measuring apparatus may include a motion sensor such as an acceleration sensor that can detect body motion information of the user or a position sensor (e.g. GPS sensor) that can measure position information.