Patent Publication Number: US-2017352695-A1

Title: Image acquisition device, bio-information acquisition device, and electronic apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. National Phase Application under 35 U.S.C. 371 of International Application No. PCT/JP2015/005798 filed on Nov. 19, 2015 and published in Japanese as WO 2016/098283 A1 on Jun. 23, 2016. This application claims priority to Japanese Patent Application No. 2014-254827 filed Dec. 17, 2014. The entire disclosures of all of the above applications are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present invention relates to an image acquisition device, a bio-information acquisition device, and an electronic apparatus. 
     BACKGROUND ART 
     An imaging device which images a subject and acquires an image is disclosed (JP-A-2014-67577). The imaging device disclosed in JP-A-2014-67577 has a structure in which a light receiving section, a light shielding section, a light emitting section, and a light condensing section are laminated sequentially. After incident light from the subject, which is illuminated by imaging light emitted from the light emitting section, is condensed by the light condensing section, the incident light passes through opening sections which are respectively provided in the light emitting section and the light shielding section, and reaches the light receiving section which is located in a bottom layer. The light receiving section includes a plurality of light reception elements, and is formed to perform image processing on intensity of the incident light, which is incident into the plurality of respective light reception elements, from the subject, thereby acquiring image information of the subject. 
     The light emitting section exemplified in the imaging device includes a first electrode layer, a second electrode layer, and a light emitting layer which is interposed between both the electrode layers and is formed by an organic Electro Luminescence (EL) material. A light emitting region in the light emitting section is prescribed by an insulating layer which is provided to surround a region in which the first electrode layer is in contact with the light emitting layer. In JP-A-2014-67577, an example is shown in which a location of the light emitting region for an optical axis of a lens is prescribed such that light, which is reflected on a surface of the lens as the light condensing section, among imaging light emitted from the light emitting section is not incident into light receiving surfaces of the light reception elements other than the incident light from the illuminated subject. 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, in the imaging device disclosed in JP-A-2014-67577, the second electrode layer of the light emitting section is provided as a common electrode which is common to a plurality of first electrode layers, and includes parts which are provided other than the light emitting region and face the first electrode layers through the insulating layer. A surface of the first electrode layer has a light reflection property, and the insulating layer and the second electrode layer are formed by materials which have different refractive indexes. Therefore, there is a problem in that light emitted from the light emitting layer is reflected on, for example, the surface of the first electrode layer other than the light emitting region, and, furthermore, is reflected again on a boundary surface between the insulating layer and the second electrode layer, thereby generating so-called stray light. In a case where the stray light is incident into the light receiving surfaces of the light reception elements, there is a problem in that intensity of incident light from the subject is affected, and thus it is difficult to acquire a clear image of the subject. Meanwhile, the stray light includes not only the light which is reflected on the boundary surface of the insulating layer and the second electrode layer but also light which is refracted on a boundary surface of a member, through which light passes, from the light condensing section to the light receiving section. 
     SOLUTION TO PROBLEM 
     The present invention has been made to solve at least a part of the above-described problems, and can be realized as embodiments or application examples below. 
     An image acquisition device according to this application example includes: an imaging section that includes a light reception element; a light shielding section; and a light emitting section that includes a light emitting element, in which the light shielding section includes a substrate that has a light transmitting property, a light shielding layer that is provided on a surface, which faces the imaging section, of the substrate, and an opening section that is provided in the light shielding layer so as to correspond to a disposition of the light reception element in the imaging section, in which a light transmitting layer, which has a refractive index smaller than a refractive index of the substrate of the light shielding section, is provided between the light emitting section and the light shielding section, and in which, in a case where a diameter of a light receiving surface of the light reception element is set to d, a diameter of the opening section is set to a, a disposition pitch of the light reception elements is set to p, a refractive index of the light transmitting layer is set to n1, the refractive index of the substrate is set to n2, and a distance between the light reception element and the light shielding layer is set to h, the following Expression is satisfied. 
       Arctan(( p - a /2- d/ 2)/ h )≧Arcsin( n 1 /n 2)
 
     According to the Snell laws, Arcsin(n1/n2) indicates a critical angle (hereinafter, referred to as a critical angle θm) of light which is incident into the light transmitting layer from the substrate of the light shielding section. In contrast, Arctan((p-a/2-d/2)/h) indicates an angle θ acquired in a case where light, which is incident from one opening section among opening sections that are adjacent in the light shielding section, is incident into the light receiving surface of the light reception element which faces another opening section. An incident angle of light, which is incident into the substrate of the light shielding section from the light transmitting layer, is refracted thereon, and is incident into the opening section of the light shielding section, is smaller than the critical angle θm. That is, in a case where a value of the angle θ is equal to or larger than the critical angle θm, light, which is incident into one opening section of the light shielding section, is not incident into the light receiving surface of the light reception element which faces another opening section. 
     According to this application example, it is possible to reduce the amount of stray light which is generated due to light emitted from the light emitting section and is incident into the light receiving surface of the light reception element from the opening section. Therefore, the amount of stray light, which is incident into the light receiving surface of the light reception element, is reduced, and thus it is possible to provide the image acquisition device which is capable of acquiring a clear image. 
     In the image acquisition device according to the application example, it is preferable that an adhesion layer is included between the imaging section and the light shielding section, and a refractive index n3 of the adhesion layer is approximately equal to the refractive index n2 of the substrate. 
     According to this configuration, the imaging section is strongly bonded to the light shielding section by the adhesion layer, and, even though the stray light is incident into the opening section, since it is difficult for an emission angle of the stray light from the opening section to be changed, it is difficult for the stray light to reach the light receiving surface of the light reception element. That is, it is possible to acquire a clear image and it is possible to provide the image acquisition device which has excellent durability. 
     The image acquisition device according to the application example may further include a light condensing section that includes a condensing lens which is disposed on an optical axis, in which the light reception element is connected with the opening section, between the light emitting section and the light shielding section, and the light transmitting layer may be provided between the light shielding section and the light condensing section. 
     According to this configuration, it is possible to condense incident light from a subject, which is illuminated by imaging light emitted from the light emitting section, into the light reception element by the condensing lens. In addition, compared to a case where the light condensing section is disposed on an upper side of the light emitting section, it is possible to prevent the stray light which is generated because light emitted from the light emitting section is reflected on the lens surface of the condensing lens. That is, it is possible to provide the image acquisition device which is capable of acquiring a further clear image. 
     In the image acquisition device according to the application example, it is preferable that the light transmitting layer is a vacuum layer or an air layer. 
     According to this configuration, the refractive index n1 of the light transmitting layer is approximately 1. Therefore, compared to a case where the refractive index n1 of the light transmitting layer is larger than 1, a refraction angle acquired in a case where the stray light is incident into the substrate of the light shielding section from the light transmitting layer becomes larger, and thus it is difficult for the stray light refracted on the substrate to be incident into the opening section of the light shielding section. That is, it is possible to provide the image acquisition device which is hardly affected by the stray light. 
     In the image acquisition device according to the application example, it is preferable that the light emitting element includes a reflecting layer that has a light reflection property, an electrode that has a light transmission property, and a light-emitting function layer that is disposed between the reflecting layer and the electrode, the light emitting section includes an insulating layer that is disposed between the reflecting layer and the electrode and decides a light emitting region in the light-emitting function layer, and a light transmitting section that is disposed between the adjacent light emitting elements, and an outer edge of the reflecting layer is located on a side of the light transmitting section rather than an end of the insulating layer on the side of the light transmitting section. 
     According to this configuration, it is possible to reflect the stray light, which is emitted from the light-emitting function layer of the light emitting element and has a possibility of being leaked to a side of the light transmitting section through the insulating layer, by the reflecting layer. That is, since it is difficult for the stray light to reach the imaging section, it is possible to acquire a further clear image. 
     A bio-information acquisition device according to this application example includes: an imaging section that includes a light reception element; a light shielding section; and a light emitting section that includes a light emitting element which emits near infrared light, in which the light shielding section includes a substrate that has a light transmitting property, a light shielding layer that is provided on a surface, which faces the imaging section, of the substrate, and an opening section that is provided in the light shielding layer so as to correspond to a disposition of the light reception element in the imaging section, in which a light transmitting layer, which has a refractive index smaller than a refractive index of the substrate of the light shielding section, is provided between the light emitting section and the light shielding section, and in which, in a case where a diameter of a light receiving surface of the light reception element is set to d, a diameter of the opening section is set to a, a disposition pitch of the light reception elements is set to p, a refractive index of the light transmitting layer is set to n1, the refractive index of the substrate is set to n2, and a distance between the light reception element and the light shielding layer is set to h, the following Expression is satisfied. 
       Arctan(( p - a/ 2- d/ 2)/ h )≧Arcsin( n 1/ n 2)
 
     According to the Snell laws, Arcsin(n1/n2) indicates a critical angle (hereinafter, referred to as a critical angle θm) of light which is incident into the light transmitting layer from the substrate of the light shielding section. In contrast, Arctan((p-a/2-d/2)/h) indicates an angle θ acquired in a case where light, which is incident from one opening section among opening sections that are adjacent in the light shielding section, is incident into the light receiving surface of the light reception element which faces another opening section. An incident angle of light, which is incident into the substrate of the light shielding section from the light transmitting layer, is refracted thereon, and is incident into the opening sections of the light shielding section, is smaller than the critical angle θm. That is, in a case where a value of the angle θ is equal to or larger than the critical angle θm, light, which is incident into one opening section of the light shielding section, is not incident into the light receiving surface of the light reception element which faces another opening section. 
     According to this application example, it is possible to reduce the amount of stray light which is generated due to light (near infrared light) emitted from the light emitting section and is incident into the light receiving surface of the light reception element from the opening section. Therefore, the amount of stray light, which is incident into the light receiving surface of the light reception element, is reduced, and thus it is possible to provide the bio-information acquisition device which is capable of acquiring clear bio-information. 
     In the bio-information acquisition device according to the application example, it is preferable that an adhesion layer is included between the imaging section and the light shielding section, and a refractive index n3 of the adhesion layer is approximately equal to the refractive index n2 of the substrate. 
     According to this configuration, the imaging section is strongly bonded to the light shielding section by the adhesion layer, and, even though the stray light is incident into the opening section, since it is difficult for an emission angle of the stray light from the opening section to be changed, it is difficult for the stray light to reach the light receiving surface of the light reception element. That is, it is possible to acquire clear bio-information and it is possible to provide the bio-information acquisition device which has excellent durability. 
     The bio-information acquisition device according to the application example may further include a light condensing section that includes a condensing lens which is disposed on an optical axis, in which the light reception element is connected with the opening section, between the light emitting section and the light shielding section, and the light transmitting layer may be provided between the light shielding section and the light condensing section. 
     According to this configuration, it is possible to condense incident light from a subject, which is illuminated by imaging light emitted from the light emitting section, into the light reception element by the condensing lens. In addition, compared to a case where the light condensing section is disposed on an upper side of the light emitting section, it is possible to prevent the stray light which is generated because light emitted from the light emitting section is reflected on the lens surface of the condensing lens. That is, it is possible to provide the bio-information acquisition device which is capable of acquiring further clear bio-information. 
     In the bio-information acquisition device according to the application example, it is preferable that the light transmitting layer is a vacuum layer or an air layer. 
     According to this configuration, the refractive index n1 of the light transmitting layer is approximately 1. Therefore, compared to a case where the refractive index n1 of the light transmitting layer is larger than 1, a refraction angle acquired in a case where the stray light is incident into the substrate of the light shielding section from the light transmitting layer becomes larger, and thus it is difficult for the stray light refracted on the substrate to be incident into the opening section of the light shielding section. That is, it is possible to provide the bio-information acquisition device which is hardly affected by the stray light. 
     In the bio-information acquisition device according to the application example, it is preferable that the light emitting element includes a reflecting layer that has a light reflection property, an electrode that has a light transmission property, and a light-emitting function layer that is disposed between the reflecting layer and the electrode, the light emitting section includes an insulating layer that is disposed between the reflecting layer and the electrode and decides a light emitting region in the light-emitting function layer, and a light transmitting section that is disposed between the adjacent light emitting elements, and an outer edge of the reflecting layer is located on a side of the light transmitting section rather than an end of the insulating layer on the side of the light transmitting section. 
     According to this configuration, it is possible to reflect the stray light, which is emitted from the light-emitting function layer of the light emitting element and has a possibility of being leaked to a side of the light transmitting section through the insulating layer, by the reflecting layer. That is, since it is difficult for the stray light to reach the imaging section, it is possible to acquire further clear bio-information. 
     An electronic apparatus according to this application example includes the image acquisition device according to the above application example. 
     According to this application example, it is possible to provide the electronic apparatus which is capable of acquiring a clear image. For example, in a case where an image, such as a face or fingerprint of an operator, is acquired by the image acquisition device, it is possible to provide an information terminal device as the electronic apparatus which ensures security of the operator. 
     An electronic apparatus according to this application example includes the bio-information acquisition device according to the above application example. 
     According to this application example, it is possible to provide the electronic apparatus which is capable of acquiring clear bio-information. For example, in a case where blood component information, such as a blood-sugar level of an examinee, is acquired by the bio-information acquisition device, it is possible to provide an electronic apparatus which is capable of performing health management of the examinee. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a configuration of a portable information terminal as an electronic apparatus. 
         FIG. 2  is a block diagram illustrating an electrical configuration of the portable information terminal. 
         FIG. 3  is a perspective view schematically illustrating a configuration of a sensor section. 
         FIG. 4  is a sectional view schematically illustrating a structure of the sensor section. 
         FIG. 5  is a sectional view typically illustrating a configuration of a light emitting element. 
         FIGS. 6( a ) and ( b )  are plan views schematically illustrating disposition of light emitting elements, light transmitting sections, and light reception elements. 
         FIG. 7  is a sectional view schematically illustrating a structure of a light emitting section. 
         FIG. 8  is a sectional view schematically illustrating structures of a light condensing section, a light shielding section, and an imaging section in the sensor section. 
         FIG. 9  is a sectional view schematically illustrating a structure of a sensor section as a bio-information acquisition device according to a second embodiment. 
         FIG. 10  is a plan view schematically illustrating disposition of light emitting elements and light reception elements in an image acquisition device according to a third embodiment. 
         FIG. 11  is a sectional view schematically illustrating a structure of light emitting elements according to a modification example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments which embody the present invention will be described with reference to the accompanying drawings. Meanwhile, drawings to be used are displayed by being appropriately enlarged or reduced such that parts to be described become recognizable states. 
     First Embodiment 
     &lt;Electronic Apparatus&gt; 
     First, an electronic apparatus according to an embodiment will be described using a portable information terminal as an example with reference to  FIGS. 1 and 2 .  FIG. 1  is a perspective view illustrating a configuration of the portable information terminal as the electronic apparatus, and  FIG. 2  is a block diagram illustrating an electrical configuration of the portable information terminal as the electronic apparatus. 
     As illustrated in  FIG. 1 , a portable information terminal  100  as the electronic apparatus according to the embodiment is a device which is mounted on a wrist of a human body M and is capable of obtaining information such as an image of a blood vessel inside the wrist or a specific component in blood of the blood vessel. The portable information terminal  100  includes a circular belt  164  that is attachable to the wrist, a main body section  160  that is attached to the outside of the belt  164 , and a sensor section  150  that is attached to the inside of the belt  164  in a location which faces the main body section  160 . The main body section  160  includes a main body case  161  and a display section  162  that is incorporated in the main body case  161 . In addition to the display section  162 , operational buttons  163 , a circuit system (see  FIG. 2 ), such as a control section  165  which will be described later, a battery as a power supply, and the like are incorporated in the main body case  161 . 
     The sensor section  150  is an example of a bio-information acquisition device according to the present invention, and is electrically connected to the main body section  160  through wirings (not shown in  FIG. 1 ) incorporated in the belt  164 . It is preferable that the belt  164  has elasticity when taking a mounting property on the human body M into consideration. 
     The portable information terminal  100  is used by being mounted on the wrist such that the sensor section  150  is in contact with the wrist on a palm side which is opposite to the back of the hand. In a case where the portable information terminal  100  is mounted in this manner, it is possible to prevent a detection sensitivity of the sensor section  150  from being changed depending on a skin color. 
     Meanwhile, although the portable information terminal  100  according to the embodiment is configured such that the main body section  160  and the sensor section  150  are separately incorporated in the belt  164 , the portable information terminal  100  may be configured such that the main body section  160  and the sensor section  150  are integrally incorporated in the belt  164 . 
     As illustrated in  FIG. 2 , the portable information terminal  100  includes a control section  165 , the sensor section  150  which is electrically connected to the control section  165 , a storage section  167 , an output section  168 , and a communication section  169 . In addition, the portable information terminal  100  further includes the display section  162  that is electrically connected to the output section  168 . 
     The sensor section  150  includes a light emitting section  110  and an imaging section  140 . The light emitting section  110  and the imaging section  140  are electrically connected to the control section  165 , respectively. The light emitting section  110  includes light emitting elements that emit near infrared light IL which has a wavelength in a range of 700 nm to 2000 nm. The control section  165  drives the light emitting section  110  and causes the light emitting section  110  to emit the near infrared light IL. The near infrared light IL is propagated and scattered inside the human body M. It is configured such that it is possible to receive a part of the near infrared light IL scattered inside the human body M as reflected light RL by the imaging section  140 . 
     The control section  165  is capable of storing information of the reflected light RL received by the imaging section  140  in the storage section  167 . In addition, the control section  165  causes the output section  168  to process the information of the reflected light RL. The output section  168  converts the information of the reflected light RL into information of an image of the blood vessel and outputs the resulting information or converts the information of the reflected light RL into information of a specific component included in blood and outputs the resulting information. In addition, the control section  165  is capable of displaying the information of the image of the blood vessel and the information of the specific component in blood, which are acquired through conversion, on the display section  162 . In addition, it is possible to transmit the pieces of information from the communication section  169  to another information processing device. In addition, the control section  165  is capable of receiving information, such as a program, from another information processing device through the communication section  169 , and storing the received information in the storage section  167 . The communication section  169  may be a wired communication section that is connected to another information processing device by a wired line, and may be a wireless communication section such as Bluetooth (registered trademark). Meanwhile, the control section  165  may not only display the acquired information related to the blood vessel and blood on the display section  162  but also display information of a program, which is stored in the storage section  167  in advance, and information of current time, and the like on the display section  162 . In addition, the storage section  167  may be a detachable memory. 
     &lt;Bio-Information Acquisition Device&gt; 
     Subsequently, the sensor section  150  as the bio-information acquisition device according to the embodiment will be described with reference to  FIGS. 3 and 4 .  FIG. 3  is a perspective view schematically illustrating a configuration of the sensor section, and  FIG. 4  is a sectional view schematically illustrating a structure of the sensor section. 
     As illustrated in  FIG. 3 , the sensor section  150  includes the light emitting section  110 , a light condensing section  120 , a light shielding section  130 , and the imaging section  140 . The respective sections have plate shapes, respectively, and are configured such that the light shielding section  130 , the light condensing section  120 , and the light emitting section  110  are sequentially laminated on the imaging section  140 . The sensor section  150  receives a laminated body in which the respective sections are laminated, and includes a case (not shown in the drawing) which is attachable to the belt  164  of the portable information terminal  100 . Meanwhile, the light emitting section  110  includes an element substrate  111  in which light emitting elements are formed, a protective substrate  114  which protects the light emitting element. Hereinafter, description will be performed while a direction along one side of the laminated body is set to an X direction, a direction along another side which is perpendicular to the one side is set to a Y direction, and a thickness direction of the laminated body is set to a Z direction. In addition, viewing from a side of the protective substrate  114  along the Z direction is referred to as a planar view. 
     As illustrated in  FIG. 4 , the light emitting section  110  is formed to include the element substrate  111  in which light emitting elements  30  are provided, a sealing layer  113  that seals the light emitting elements  30  such that moisture or the like does not permeate the light emitting elements  30 , and the protective substrate  114  that is disposed to face the element substrate  111  through the sealing layer  113 . 
     The protective substrate  114  is, for example, a cover glass or plastic substrate which has a light transmitting property. The human body M is disposed to be in contact with one surface  114   a  of the protective substrate  114 . Hereinafter, the substrate which has the light transmitting property indicates a substrate which is formed of glass or plastics, and the light transmitting property indicates that transmittance is at least equal to or higher than 85% in a representative wavelength of light emitted from the light emitting section  110 . 
     The sealing layer  113  is formed of, for example, a thermosetting epoxy resin or an acrylic resin, and has the light transmitting property. 
     The substrate which has the light transmitting property is also used as a substrate main body of the element substrate  111 . Although details will be described later, the light emitting elements  30  are formed to emit near infrared light IL in the element substrate  111  to a side of the protective substrate  114  and are capable of illuminating the human body M disposed on the protective substrate  114 . The element substrate  111  includes the light transmitting sections  112  that guide the reflected light RL, which is reflected from the inside the illuminated human body M and is incident into the light emitting section  110 , to the light condensing section  120  on the lower layer. The light transmitting sections  112  are disposed between the light emitting elements  30  which are disposed to be adjacent. 
     The light condensing section  120  includes a substrate  121  which has the light transmitting property, and a plurality of condensing lenses  122  that are provided on one surface  121   a  of the substrate  121 . The light condensing section  120  and the light emitting section  110  are bonded such that projected lens surfaces  122   a  of the condensing lenses  122  face the light shielding section  130 . In addition, the light condensing section  120  and the light emitting section  110  are bonded such that optical centers of the condensing lenses  122  are located on the optical axis of the reflected light RL which passes through the light emitting section  110 . In other words, a disposition gap between the light transmitting sections  112  in the light emitting section  110  is basically the same as a disposition gap between the condensing lenses  122  in the light condensing section  120 . 
     The light shielding section  130  includes a substrate  131  which has the light transmitting property, and a light shielding layer  132  that is provided on a surface  131   a  of the substrate  131  on a side opposite to a surface  131   b  on the side of the light condensing section  120 . In the light shielding layer  132 , opening sections (pinholes)  133  are formed in locations corresponding to the dispositions of the light transmitting sections  112  of the light emitting section  110 . The light shielding section  130  is disposed between the light condensing section  120  and the imaging section  140  such that only the reflected light RL, which passes through the opening sections  133 , is led to light reception elements  142 , and remaining reflected light RL is shielded by the light shielding layer  132 . The light shielding layer  132  is formed using, for example, a metal film, which has a light shading property and is formed by a metal, such as Cr, or an alloy thereof, or a resin film which includes a light absorbing material capable of absorbing at least near infrared light. 
     The light condensing section  120  and the light shielding section  130  are disposed to face each other through a light transmitting layer  125 . Specifically, the light transmitting layer  125  is an empty space and is formed by a vacuum layer or an air layer. In other words, the surface  121   a,  on which the condensing lenses  122  of the light condensing section  120  are provided, and the surface  131   b  of the light shielding section  130  are disposed to face each other with a prescribed gap, and the light condensing section  120  is bonded to the light shielding section  130  under vacuum or under atmospheric pressure. 
     The imaging section  140  is an image sensor for near infrared light, and includes a substrate  141  and a plurality of light reception elements  142  that are provided on a surface  141   a  of the substrate  141  on a side of the light shielding section  130 . It is possible to use, for example, an optical sensor, such as a CCD or a CMOS, as the light reception element  142 . The substrate  141  may include, for example, a glass epoxy substrate or a ceramic substrate, on which it is possible to mount the light reception elements  142 , or a semiconductor substrate, in which it is possible to vertically form the light reception elements  142  thereon, and includes an electric circuit (not shown in the drawing) to which the light reception elements  142  are connected. The plurality of light reception elements  142  are disposed on the surface  141   a  of the substrate  141  in locations corresponding to the dispositions of the opening sections  133  of the light shielding section  130 . 
     It is known that optical sensors, which are used as the light reception elements  142 , have different sensitivities according to wavelengths. For example, a CMOS sensor has higher sensitivity for visible light than sensitivity for near infrared light IL. In a case where the CMOS sensor receives visible light in addition to near infrared light IL (reflected light RL), visible light is output from the CMOS sensor as noise. Therefore, for example, filters that cut light in a visible light wavelength range (400 nm to 700 nm) may be disposed to correspond to the light transmitting sections  112  of the light emitting section  110  or the opening section  133  of the light shielding section  130 . 
     The light shielding section  130  and the imaging section  140  are disposed to face each other with a prescribed gap, and are boned to each other through an adhesion layer  135  which has the light transmitting property. In the embodiment, respective members, which form the substrate  131  and the adhesion layer  135 , are selected such that a refractive index of the substrate  131  of the light shielding section  130  is almost equal to a refractive index of the adhesion layer  135 . For example, the substrate  131  of the light shielding section  130  is a quartz glass substrate (refractive index n2≈1.53), and the adhesion layer  135  is an epoxy-based resin (refractive index n3≈1.55). 
     Meanwhile, the configuration of the sensor section  150  is not limited thereto. For example, the light emitting section  110  may include a structure which seals the light emitting elements  30  by the protective substrate  114  without the sealing layer  113 . In addition, since there is a problem in that the reflected light RL, which passes through the light transmitting sections  112 , is attenuated by being reflected on a boundary surface of a member, through which the reflected light passes, it is preferable that the light emitting section  110  is bonded to the light condensing section  120  such that, for example, a surface  111   a  of the element substrate  111  of the light emitting section  110  on a side of the light condensing section  120  is in contact with a surface  121   b  of the substrate  121  of the light condensing section  120  on a side of the light emitting section  110 . In addition, in this manner, it is possible to ensure a locational relationship between the light transmitting sections  112  and the condensing lenses  122  in the thickness direction (Z direction). 
     [Light Emitting Element] 
     Subsequently, the light emitting element  30  will be described with reference to  FIG. 5 .  FIG. 5  is a sectional view typically illustrating a configuration of the light emitting element. 
     As illustrated in  FIG. 5 , the light emitting element  30  includes a reflecting layer  21  that is provided on the element substrate  111  and has a light reflection property, an anode  31  that has a light transmission property, a light-emitting function layer  36 , and a cathode  37  that functions as an electrode which has the light transmission property. An interlayer insulation film  22  that adjusts a distance between the reflecting layer  21  and the anode  31  is provided between the reflecting layer  21  and the anode  31 . The light-emitting function layer  36  includes a hole injection transport layer  32 , a light emitting layer  33 , an electron transport layer  34 , and an electron injection layer  35  which are sequentially laminated from a side of the anode  31 . In the light emitting element  30 , holes injected from the side of the anode  31  are recombined with electrons injected from a side of the cathode  37  in the light emitting layer  33 , and thus energy, emitted in a case of the recombination, is emitted as light. The light emitting layer  33  includes a light emitting material which is formed of an organic semiconductor material, and the light emitting element  30  is referred to as an organic electro-luminescence (EL) element. Light emitted from the light emitting layer  33  is emitted after passing through the cathode  37 . In addition, a part of the emitted light passes through the anode  31  and is reflected on the reflecting layer  21 , passes through the anode  31  again, and is emitted from the side of the cathode  37 . That is, it is possible to extract almost light emitted in the light emitting layer  33  from the side of the cathode  37 . The light emitting element  30  is referred to as a top emission type. 
     [Reflecting Layer] 
     It is possible to form the reflecting layer  21  using, for example, a metal, such as Al (aluminum) or Ag (silver), which has a light reflection property, or an alloy thereof. In a case where the light reflection property and productivity are taken into consideration, it is preferable that a combination of Al (aluminum) and Cu (copper), a combination of Al (aluminum) and Nd (neodymium), or the like is used as the alloy. A film thickness of the reflecting layer  21  is set to, for example, 200 nm by taking the light reflection property into consideration. 
     [Anode] 
     The anode  31  is formed using, for example, a transparent conductive film, such as ITO, which has a large work function by taking a hole injection property into consideration. A film thickness of the anode  31  is set to, for example, 15 nm by taking a light transmission property into consideration. 
     [Cathode] 
     The cathode  37  is formed to have the light reflection property and the light transmission property by controlling film thickness using, for example, an alloy including Ag and Mg. A film thickness of the cathode  37  is, for example, 20 nm. Meanwhile, the cathode  37  is not limited to an alloy layer formed of Ag and Mg, and may have, for example, a multi-layered structure in which a layer formed of Mg is laminated on the alloy layer formed of Ag and Mg. With the configuration which includes the reflecting layer  21 , the anode  31 , and the cathode  37 , a part of light emitted from the light-emitting function layer  36  of the light emitting element  30  is repeatedly reflected between the cathode  37  and the reflecting layer  21 , and is emitted after an intensity of light having a specific wavelength is enhanced based on an optical distance between the cathode  37  and the reflecting layer  21 . That is, an optical resonant structure in which the intensity of light having a specific wavelength is enhanced is introduced for the light emitting element  30 . The interlayer insulation film  22 , which is provided between the reflecting layer  21  and the anode  31 , is provided to adjust the optical distance in the optical resonant structure, and is formed using, for example, a silicon oxide. 
     [Light Emitting Layer] 
     The light emitting layer  33  of the light-emitting function layer  36  includes a light emitting material (organic semiconductor material) in which light emitted in a near-infrared wavelength range (700 nm to 20000 nm) is acquired. It is possible to give, for example, a well-known light emitting material, such as a thiadiazole-based compound or a selenadiazole-based compound, as the light emitting material. In addition, in addition to the light emitting material, a host material in which the light emitting material is added (supported) as a guest material (dopant) is used. The host material has functions of generating exciton by recombining holes and electrons, moving (Foerster movement or Dexter movement) exciton energy to the light emitting material, and exciting the light emitting material. Therefore, it is possible to increase light-emitting efficiency. For example, a light emitting material, which is the guest material, is doped as the dopant and is used for the host material. 
     Particularly, it is preferable that a quinolinolato metal complex or an acene-based organic compound is used as the host material. An anthracene-based material or a tetracene-based material is preferable in the acene-based material, and the tetracene-based material is further preferable. In a case where the host material of the light emitting layer  33  is formed to include the acene-based material, it is possible to effectively deliver electrons from an electron transport material in the electron transport layer  34 , which will be described later, to the acene-based material in the light emitting layer  33 . 
     In addition, the acene-based material has excellent resistance for the electrons and the holes. In addition, the acene-based material has excellent thermal stability. Therefore, it is possible to realize the long-life light emitting element  30 . In addition, since the acene-based material has the excellent thermal stability, it is possible to prevent the host material from being decomposed by heat generated when a film is formed in a case where the light emitting layer  33  is formed using a vapor phase film deposition method. Therefore, it is possible to form the light emitting layer  33  which has excellent film quality. As a result, at this point, it is possible to increase light-emitting efficiency of the light emitting element  30  and to realize the long life. 
     Furthermore, since it is difficult for the acene-based material to emit light in itself, it is possible to prevent the host material from adversely affecting a light emission spectrum of the light emitting element  30 . 
     It is preferable that a light emitting material content (doping amount) in the light emitting layer  33 , which includes the light emitting material and the host material, is in a range of 0.01 wt % to 10 wt %, and a range of 0.1 wt % to 5 wt % is further preferable. In a case where the light emitting material content is included in the range, it is possible to optimize the light-emitting efficiency. 
     In addition, although an average thickness of the light emitting layer  33  is not particularly limited, it is preferable that the average thickness of the light emitting layer  33  is in a degree of 1 nm to 60 nm, and a degree of 3 nm to 50 nm is further preferable. 
     [Hole Injection Transport Layer] 
     The hole injection transport layer  32  is formed to include a hole injection transport material for improving a hole injection property and a hole transport property for the light emitting layer  33 . It is possible to exemplify, for example, an aromatic amine compound, in which a part of a framework is selected among a phenylenediamine system, a benzidine system, and a terphenylenediamine system, as the hole injection transport material. 
     Although the average thickness of the hole injection transport layer  32  is not particularly limited, it is preferable that the average thickness of the hole injection transport layer  32  is in a degree of 5 nm to 200 nm, and a degree of 10 nm to 100 nm is further preferable. 
     Meanwhile, in the light emitting element  30 , a layer which is provided between the anode  31  and the light emitting layer  33  is not limited to only the hole injection transport layer  32 . For example, a plurality of layers that include a hole injection layer, into which holes are easily injected from the anode  31 , and a hole transport layer, in which holes are easily transported to the light emitting layer  33 , may be provided. In addition, a layer, which blocks electrons that are leaked from the light emitting layer  33  to the side of the anode  31 , may be included. 
     [Electron Transport Layer] 
     The electron transport layer  34  has a function of transporting electrons injected from the cathode  37  through the electron injection layer  35  to the light emitting layer  33 . As a material (electron transport material) which forms the electron transport layer  34 , for example, a phenanthroline derivative such as 2,9-dimethyl-4, 7-diphenyl-1, or 10-phenanthroline (BCP), a quinoline derivative such as 8-quinolinol including tris(8-quinolinolato) aluminum (Alq3) or an organic metal complex in which the derivative is used as a ligand, an azaindolizine derivative, an oxadiazole derivative, a perylene derivative, a pyridine derivative, a pyrimidine derivative, a quinoxaline derivative, a diphenyl quinone derivative, a nitro substituted fluorene derivative, and the like are exemplified. It is possible to combine one or more types of the above derivatives and to use a resulting derivative. 
     In addition, in a case where two or more types of the above-described electron transport materials are combined to use the resulting material, the electron transport layer  34  may be formed of a mixture material in which two or more types of electron transport materials are mixed, or may be formed by laminating a plurality of layers which are formed by different electron transport materials. 
     Particularly, in a case where a tetracene derivative is used as the host material in the light emitting layer  33 , it is preferable that the electron transport layer  34  includes an azaindolizine derivative. The azaindolizine derivative, which has an anthracene framework in a molecule, is further preferable. It is possible to effectively deliver electrons from the anthracene framework in the azaindolizine derivative molecule to the host material. 
     Although the average thickness of electron transport layer  34  is not particularly limited, it is preferable that the average thickness is in a degree of 1 nm to 200 nm, and a degree of 10 nm to 100 nm is further preferable. 
     Meanwhile, a layer provided between the light emitting layer  33  and the electron injection layer  35  is not limited to only the electron transport layer  34 . For example, a plurality of layers may be provided that include a layer in which it is easy to inject electrons from the electron injection layer  35 , a layer in which it is easy to transport electrons to the light emitting layer  33 , and a layer which is used to control the amount of electrons to be injected to the light emitting layer  33 . In addition, a layer may be included that has a function of blocking holes which are leaked to a side of the electron injection layer  35  from the light emitting layer  33 . 
     [Electron Injection Layer] 
     The electron injection layer  35  has a function of improving electron injection efficiency from the cathode  37 . 
     For example, various inorganic insulating materials and various inorganic semiconductor materials are exemplified as component materials (materials having an electron injection property) of the electron injection layer  35 . 
     For example, alkaline metal chalcogenide (an oxide, a sulfide, a selenide, and a telluride), alkaline-earth metal chalcogenide, alkaline metal halogenide, and alkaline-earth metal halogenide, and the like are exemplified as the inorganic insulating materials, and it is possible to combine one or more types of inorganic insulating materials and to use the resulting material. In a case where the electron injection layer (EIL) is formed using the inorganic insulating materials as main materials, it is possible to improve the electron injection property. Particularly, an alkaline metal compound (alkaline metal chalcogenide, alkaline metal halogenide, and the like) has an extremely small work function, and, in a case where the electron injection layer  35  is formed using the compound, the light emitting element  30  may provide high light-emitting brightness. 
     For example, Li 2 O, LiO, Na 2 S, Na 2 Se, NaO, and the like are exemplified as the alkaline metal chalcogenide. 
     For example, CaO, BaO, SrO, BeO, BaS, MgO, CaSe, and the like are exemplified as the alkaline-earth metal chalcogenide. 
     For example, CsF, LiF, NaF, KF, LiCl, KCl, NaCl, and the like are exemplified as the alkaline metal halogenide. 
     For example, CaF 2 , BaF 2 , SrF 2 , MgF 2 , BeF 2 , and the like are exemplified as the alkaline-earth metal halogenide. 
     In addition, for example, an oxide, a nitride, an oxynitride, or the like which includes at least one element among Li, Na, Ba, Ca, Sr, Yb, Al, Ga, In, Cd, Mg, Si, Ta, Sb, and Zn, is exemplified as the inorganic semiconductor material, and it is possible to combine one or more types of materials and to use the resulting material. 
     Although the average thickness of the electron injection layer  35  is not particularly limited, a degree of 0.1 nm to 1000 nm is preferable, a degree of 0.2 nm to 100 nm is further preferable, and a degree of 0.2 nm to 50 nm is further preferable. 
     Meanwhile, the electron injection layer  35  may be omitted depending on the component materials or the thickness of the cathode  37  and the electron transport layer  34 . 
     Subsequently, a disposition relationship between the light emitting elements  30 , the light transmitting sections  112 , and the light reception elements  142  in the sensor section  150  will be described with reference to  FIGS. 6( a ) and 6( b ) .  FIGS. 6( a ) and 6( b )  are plan views schematically illustrating disposition of the light emitting elements, the light transmitting sections, and the light reception elements. 
     As illustrated in  FIGS. 6( a ) and 6( b ) , the light reception elements  142 , to which the reflected light RL from the human body M is led, are disposed in a matrix shape with prescribed gaps in the X direction and the Y direction. Light receiving surfaces  142   a  of the light reception elements  142  are formed in circle shapes. The light transmitting sections  112 , which lead the reflected light RL to the light reception elements  142 , are formed in approximately circle shapes around the light reception elements  142  such that the reflected light RL is uniformly and evenly led to the light receiving surfaces  142   a.  The opening sections  133  of the light shielding sections  130  are disposed around the light reception elements  142  on inner sides of the light transmitting sections  112 , and are formed in circle shapes which are larger than the light receiving surfaces  142   a.    
     Therefore, the planar shapes of the light emitting elements  30  disposed between the light transmitting sections  112  are formed in approximately rhombic shapes which are surrounded by arcs. The planar shapes of the light emitting elements  30  are prescribed by shapes of the reflecting layers  21 , the anodes  31 , and partition wall sections  23 . Specifically, the approximately circular light transmitting sections  112  are prescribed by arc-shaped parts of outer edges  21   a  of the approximately rhombic-shaped reflecting layers  21 . The anodes  31 , which are disposed inner sides of the reflecting layers  21  in a planar view, have sizes slightly smaller than the reflecting layers  21 , and have approximately rhombic shapes similarly to the reflecting layers  21 . The partition wall sections  23  corresponding to insulating layers according to the present invention are provided to overlap outer edges  31   a  of the anodes  31 , and prescribes regions in which the anodes  31  are in contact with the light-emitting function layers  36 , that is, light emitting regions  31   b  of the light emitting elements  30 . Therefore, planar shapes of the light emitting regions  31   b  are slightly smaller than the anodes  31  and have approximately rhombic shapes. 
     The reflecting layers  21  and the anodes  31  are independently provided for the plurality of respective light emitting elements  30 . In contrast, the interlayer insulation films  22 , which cover the reflecting layers  21 , are provided across the plurality of reflecting layers  21 . In addition, the cathodes  37  are provided as common electrodes across the plurality of light emitting elements  30 . 
     As described above, the sensor section  150  according to the embodiment includes the plurality of light emitting elements  30  and the plurality of light reception elements  142 , and is in a state in which four light emitting elements  30  are disposed in the vicinity of one light reception element  142  (light transmitting section  112 ). In other words, the sensor section  150  is in a state in which four light reception elements  142  (light transmitting sections  112 ) are disposed in the vicinity of one light emitting element  30 . It is preferable that the number of light reception elements  142 , which are disposed in a matrix shape in the X direction and the Y direction, in the imaging section  140  is equal to or larger than, for example, 240×240=57600, from a viewpoint in which bio-information is acquired with high accuracy. 
     Subsequently, a detailed structure of the light emitting section  110  will be described with reference to  FIG. 7 .  FIG. 7  is a sectional view schematically illustrating the structure of the light emitting section. Specifically,  FIG. 7  is a sectional view schematically illustrating the structures of the light emitting element  30  and the light transmitting section  112  taken along a line A-A′ which passes through the reflecting layer  21  illustrated in  FIG. 6( a )  in a direction of an angle of 45°. 
     As illustrated in  FIG. 7 , the light emitting section  110  includes the light emitting element  30  and the light transmitting section  112  which are formed on the element substrate  111 . On the element substrate  111 , first, a film, which is formed of, for example, a metal, such as Al (aluminum), that has the light reflection property or an alloy thereof, is formed, and the reflecting layer  21  is formed by patterning the film. Subsequently, the interlayer insulation film  22 , which covers the reflecting layer  21  over the entire surface of the element substrate  111 , is formed. For example, a transparent conductive film, such as ITO, is formed on the interlayer insulation film  22 , and the anode  31  is formed on an upper side of the reflecting layer  21  by patterning the transparent conductive film. The outer edge  31   a  of the anode  31  is patterned to be located on an inner side than the outer edge  21   a  of the reflecting layer  21 . The partition wall section  23  is formed in a location which overlaps the outer edge  31   a  of the anode  31 . It is possible to form the partition wall section  23  as the insulating layer using an inorganic or organic insulating material. In the embodiment, a photosensitive resin film, which has a film thickness of 1.0 μm to 2.0 μm, is formed over the approximately entire surface of the element substrate  111 . The partition wall section  23  is formed by patterning the photosensitive resin film. The partition wall section  23  is patterned to surround the light emitting region  31   b  in which the anode  31  is in contact with the light-emitting function layer  36 . In addition, the partition wall section  23  is patterned such that an end  23   a  of the partition wall section  23  on a side opposite to the light emitting region  31   b  is located between the outer edge  21   a  of the reflecting layer  21  and the outer edge  31   a  of the anode  31 . Subsequently, the light-emitting function layer  36  is formed over the approximately entire surface of the element substrate  111  on which the partition wall section  23  is formed. As described above, the light-emitting function layer  36  includes the hole injection transport layer  32 , the light emitting layer  33 , the electron transport layer  34 , and the electron injection layer  35 , and the respective layers are formed to be sequentially laminated using, for example, the vapor phase film deposition method such as a vacuum evaporation method. The respective layers are not limited to the layers which are formed using the vapor phase film deposition method, and a part of the layers may be formed using a liquid phase deposition method. Subsequently, the cathode  37 , which covers the light-emitting function layer  36  over the approximately entire surface of the element substrate  111 , is formed to have the light reflection property and the light transmission property using an alloy of Ag and Mg by, for example, the vapor phase film deposition method such as the vacuum evaporation method. 
     As described above, the light emitting element  30  includes the reflecting layer  21 , the interlayer insulation film  22 , the anode  31 , the light-emitting function layer  36 , and the cathode  37 . The light transmitting section  112 , which is formed between the light emitting elements  30  on the element substrate  111 , includes the interlayer insulation film  22 , the light-emitting function layer  36 , and the cathode  37 . Meanwhile, although not illustrated in  FIG. 7 , a pixel circuit, which is capable of applying an electrical current between the anode  31  and the cathode  37  by performing electrical switching control on the anode  31  of the light emitting element  30 , is provided between the substrate main body of the element substrate  111  and the reflecting layer  21 . The pixel circuit includes transistors and storage capacities as switching elements, and wirings which connect them. The reflecting layer  21  functions as a relay electrode which applies an electrical potential to the anode  31  by the pixel circuit. 
     According to the structure of the light emitting section  110 , the most of light emitted from the light emitting region  31   b  of the top emission-type light emitting element  30  is emitted from the side of the cathode  37 . In contrast, there is a problem in that, at a part where the partition wall section  23  is provided on the outside of the light emitting region  31   b,  light emitted from the light-emitting function layer  36  is reflected on a surface of the anode  31  as illustrated by a solid line arrow of  FIG. 7 , thereafter, is reflected on the boundary between the light-emitting function layer  36  and the cathode  37 , and is leaked to the outside from the outer edge  31   a  of the anode  31 . However, since the reflecting layer  21  is disposed on the outside from the outer edge  31   a  of the anode  31 , the leaked light (stray light) is reflected by the reflecting layer  21 . That is, since the stray light, which is leaked through the partition wall section  23 , is reflected on the reflecting layer  21  as described above, a structure is provided in which it is difficult for the stray light to be incident into the light transmitting section  112  between the light emitting elements  30 . 
     Subsequently, the detailed structures of the light condensing section  120 , the light shielding section  130 , and the imaging section  140  will be described with reference to  FIG. 8 .  FIG. 8  is a sectional view schematically illustrating the structures of the light condensing section, the light shielding section, and the imaging section in the sensor section. Specifically,  FIG. 8  is a sectional view schematically illustrating the structures of the light condensing section  120 , the light shielding section  130 , and the imaging section  140  taken along a line B-B′ which is illustrated in  FIG. 6( a )  and crosses the light reception elements  142  which are adjacent in the X direction. Also, for easy understanding of description, refraction angles of an optical axis are exaggeratedly drawn in  FIG. 8 . 
     As illustrated in  FIG. 8 , the light shielding section  130  is laminated on the imaging section  140  through the adhesion layer  135 , and, further, the light condensing section  120  is laminated on the light shielding section  130  through the light transmitting layer  125 . Since the light transmitting layer  125  is a vacuum layer or an air layer as described above, there is a case where the light transmitting layer  125  is referred to as an empty space  125 . On an optical axis L 0 , which passes through a center of the condensing lens  122  having the projected lens surface  122   a,  a center of the light receiving surface  142   a  of the light reception elements  142  and a center of the opening section  133  of the light shielding layer  132  are located. Meanwhile, actually, in a case where the imaging section  140 , the light shielding section  130 , and the light condensing section  120  are laminated, the center of the condensing lenses  122 , the center of the light receiving surface  142   a  of the light reception elements  142 , and the center of the opening section  133  of the light shielding layer  132  may be located for the optical axis L 0  in an allowance range of a manufacturing process in an in-plane which is vertical to the optical axis L 0 . 
     As described above, the reflected light RL, which is emitted from the human body M illuminated by the light emitting section  110 , is incident into the condensing lens  122  of the light condensing section  120 . The reflected light RL, which is condensed by the condensing lens  122 , passes through the opening section  133  of the light shielding section  130  and is incident into the light reception element  142  of the imaging section  140 . In other words, relative locations of the condensing lens  122 , the opening section  133 , and the light reception element  142  on the optical axis L 0  are determined by taking a focal distance of the condensing lens  122  into consideration such that the reflected light RL, which is condensed by the condensing lens  122 , is incident into the light reception element  142 . 
     In contrast, light, which is incident into another surface  131   b  that faces one surface  131   a  on which the light shielding layer  132  of the substrate  131  is provided, includes both the reflected light RL which is condensed by the condensing lens  122  and the reflected light RL which is not incident into the condensing lens  122 . Since the empty space  125 , which has a smaller refractive index than the refractive index of the substrate  131 , exists between the light condensing section  120  and the substrate  131  of the light shielding section  130 , light which is incident into another surface  131   b  of the substrate  131  from a side of the empty space  125  is refracted by the substrate  131 . However, it is not limited that the whole refracted light is incident into the light reception element  142 . 
     For example, as illustrated by a solid line arrow in  FIG. 8 , there is a possibility in that, in one light reception element  142  and another light reception element  142  which are disposed to be adjacent in the X direction in the imaging section  140 , light, which is incident into the opening section  133  that faces another light reception element  142 , is incident into one light reception element  142 . The light is treated also as the stray light which affects the reflected light RL that is incident into one light reception element  142 . In the embodiment, a size of the opening section  133  for a size of the light receiving surface  142   a  of the light reception element  142  and a relative locational relationship between the light reception element  142  and the opening section  133  are prescribed such that it is difficult for the stray light to be incident into one light reception element  142 . 
     Specifically, in a case where a diameter of the light receiving surface  142   a  of the light reception element  142  is set to “d”, a diameter of the opening section  133  is set to “a”, a disposition pitch of the light reception element  142  is set to “p”, a refractive index of the empty space (light transmitting layer)  125  is set to “n1”, a refractive index of the substrate  131  is set to “n2”, and a distance between the light reception element  142  and the light shielding layer  132  is set to “h”, respective values of the diameter d, the diameter a, the disposition pitch p, and the distance h are prescribed such that the following Expression (1) is satisfied. 
       Arctan(( p - a/ 2- d/ 2)/ h )≧Arcsin( n 1/ n 2) . . .   (1)
 
     According to the Snell laws, θm=Arcsin(n1/n2) indicates a critical angle θm, as illustrated in  FIG. 8 , in a case where light heads to the empty space  125  which has the refractive index n1 from the substrate  131  which has the refractive index n2 of the light shielding section  130 . In contrast, θ=Arctan((p-a/2-d/2)/h) indicates an angle θ in a case where light, which is incident from one opening section  133  (opening section  133  which is drawn at the center in  FIG. 8 ) among the opening sections  133  that are adjacent in the light shielding section  130 , is incident into the light receiving surface  142   a  of the light reception element  142  which faces another opening section  133  (opening section  133  which is drawn on the left side in  FIG. 8 ). An incident angle θγ of light Lγ, which is incident into the substrate  131  from the empty space  125 , is refracted, and is incident into the opening section  133  of the light shielding section  130 , is smaller than the critical angle θm. That is, in a case where the incident angle θγ is slightly smaller than the critical angle θm, an optical path in which light enters the substrate  131  from a side of the empty space  125  exists as an optical path of light Lγ which is incident into the opening section  133 . In a case where the incident angle θγ is equal to the critical angle θm, a total reflection condition is satisfied, and thus an optical path which enters the substrate  131  from the side of the empty space  125  does not exist. However, in a case where a virtual optical path is taken into consideration, the virtual optical path is parallel to another surface  131   b  of the substrate  131 . In this manner, in a case where the value of the angle θ is equal to or larger than the critical angle θm, light, which is incident into one opening section  133  of the light shielding section  130 , is not incident into the light receiving surface  142   a  of the light reception elements  142  which faces another opening section  133 . Meanwhile, in the embodiment, the refractive index n2 of the substrate  131  is approximately equal to the refractive index n3 of the adhesion layer  135  as described above. Therefore, in a case where an incident angle of light L3 which is incident into the opening section  133  is the angle θ, an incident angle of light which is incident into the light receiving surface  142   a  of the light reception elements  142  from the opening section  133  becomes almost the same angle θ. 
     In the embodiment, for example, the diameter d of the light receiving surface  142   a  of the light reception elements  142  is 10 μm, the diameter a of the opening section  133  is 16 μm, the distance h between the light reception elements  142  and the light shielding layer  132  is 100 μm, the disposition pitch p of the light reception elements  142  in the X direction is 100 μm, the refractive index n1 of the empty space  125  is 1.0, and the refractive index n2 of the substrate  131  is approximately 1.53. Therefore, according to Expression (1), the critical angle θm≈40.8 and the angle θ≈41.0, and thus the amount of stray light, which affects the reflected light RL that is incident into the light reception elements  142 , is reduced. Meanwhile, in the embodiment, since the empty space  125  is the vacuum layer or the air layer, it is assumed that the refractive index n1 is 1.0. However, the empty space  125 , that is, the light transmitting layer  125  is not limited to the empty space. In a case where the light transmitting layer  125  is a layer which is formed of a material which has the light transmitting property and in which a value of the refractive index n1 is smaller than the refractive index n2 of the substrate  131 , it is possible to specify the critical angle θm. 
     According to the sensor section  150  of the first embodiment, the amount of stray light, which is generated due to light (near infrared light) emitted from the light emitting section  110  and is incident into the light receiving surface  142   a  of the light reception elements  142  from the opening section  133 , is reduced. Therefore, the reflected light RL, which is incident into the light receiving surface  142   a,  is hardly affected by the stray light, and thus it is possible to realize the sensor section  150  which is capable of acquiring clear bio-information. 
     In addition, according to the portable information terminal  100  as an electronic apparatus which includes the sensor section  150 , it is possible to acquire pieces of information, such as an image of a blood vessel of the human body M on which the portable information terminal  100  is mounted and specific component in blood of the blood vessel, with high accuracy. For example, since influence of the stray light is reduced, it is possible to accurately obtain a change in light absorbance due to a change in concentration of the specific component in blood, thereby leading highly-accurate quantitative evaluation of the specific component. 
     Meanwhile, as illustrated in  FIG. 7 , the stray light includes light which is leaked to the side of the light transmitting section  112  through the partition wall section  23  located in the vicinity of the light emitting region  31   b  while the human body M is not irradiated with the near infrared light IL emitted from the light emitting elements  30 . In addition, as illustrated in  FIG. 8 , the stray light includes light, which is incident into one light reception elements  142  from the opening section  133  that faces another light reception elements  142 , in one light reception element  142  and another light reception element  142  which are disposed to be adjacent in the X direction. In addition, in  FIG. 8 , the light reception elements  142 , which are adjacent in the X direction, and the opening section  133  are exemplified, light reception elements  142 , which are adjacent in the Y direction, and the opening section  133  have the same relationship. 
     Second Embodiment 
     &lt;Bio-Information Acquisition Device&gt; 
     Subsequently, a bio-information acquisition device according to a second embodiment will be described with reference to  FIG. 9 .  FIG. 9  is a sectional view schematically illustrating a structure of a sensor section as the bio-information acquisition device according to the second embodiment. A sensor section  150 B as the bio-information acquisition device according to the second embodiment is different from the sensor section  150  according to the first embodiment in a configuration of the light emitting section  110  and disposition of the light condensing section  120 . Therefore, the same reference symbols are attached to the same components as in the sensor section  150  according to the first embodiment and the detailed description thereof will not be repeated. 
     As illustrated in  FIG. 9 , the sensor section  150 B as the bio-information acquisition device according to the embodiment includes the light condensing section  120 , a light emitting section  110 B, the light shielding section  130 , and the imaging section  140 . The respective sections have plate shapes, respectively, and are configured such that the light shielding section  130 , the light emitting section  110 B, and the light condensing section  120  are sequentially laminated on the imaging section  140 . The sensor section  150 B receives a laminated body in which the respective sections are laminated, and includes a case (not shown in the drawing) which is attachable to a belt  164  of the portable information terminal  100  as the electronic apparatus described in the first embodiment. 
     The light emitting section  110 B includes the light emitting elements  30  and the element substrate  111  on which the light transmitting sections  112  are formed. In the embodiment, the light condensing section  120  functions as a protective substrate that protects the light emitting elements  30 . Respective configurations on the element substrate  111  and the dispositions thereof are described with reference to  FIGS. 5 and 7  in the first embodiment. 
     The light transmitting layer  125  is provided between the light emitting section  110 B and the light shielding section  130 . The light transmitting layer  125  is an empty space that has a prescribed thickness in the Z direction, and the empty space is a vacuum layer or an air layer. Therefore, in the embodiment, the light transmitting layer  125  is also referred to as the empty space  125 . 
     The light shielding section  130  is bonded to the imaging section  140  through the adhesion layer  135 . In the sensor section  150 B, respective sections are laminated such that the center of the opening section  133  which is formed in the light shielding layer  132  of the light shielding section  130  and the center of the light receiving surface  142   a  of the light reception element  142  are located on an optical axis which passes through a center of a condensing lens  122  of the light condensing section  120 . 
     The relationship, which is acquired in the diameter d of the light receiving surface  142   a  of the light reception element  142  in the imaging section  140 , the disposition pitch p between the light reception elements  142 , the diameter a of the opening section  133  in the light shielding section  130 , the distance h between the light reception element  142  and the light shielding layer  132 , the refractive index n1 of the empty space  125 , the refractive index n2 of the substrate  131  of the light shielding section  130 , satisfies Expression (1) in the first embodiment. 
     A human body M is disposed on the surface  121   b  which faces the surface  121   a  on which the condensing lenses  122  of the light condensing section  120  are provided. The human body M is illuminated by near infrared light IL emitted from the light emitting elements  30  of the light emitting section  110 B, and reflected light RL which is reflected inside the illuminated human body M is incident into the light condensing section  120 . The reflected light RL which is incident into the light condensing section  120  is condensed by the condensing lenses  122 , passes through the light transmitting sections  112  of the element substrate  111 , and is led to the light reception elements  142  of the imaging section  140 . 
     The sensor section  150 B outputs an image signal based on intensity of the reflected light RL which is incident into the plurality of light reception elements  142  in the imaging section  140 . 
     According to the sensor section  150 B of the second embodiment, it is possible to reduce the amount of stray light, which is generated due to light (near infrared light) emitted from the light emitting section  110 B and is incident into the light receiving surface  142   a  of the light reception elements  142  from the opening section  133 , similarly to the sensor section  150  according to the first embodiment. Therefore, it is difficult for the reflected light RL, which is incident into the light receiving surface  142   a  of the light reception elements  142 , to be affected by the stray light, and thus it is possible to realize the sensor section  150 B which is capable of acquiring clear bio-information. 
     Particularly, even though the light, which is emitted from the light emitting elements  30 , is reflected on the lens surfaces  122   a  of the condensing lenses  122  and stray light, which is incident into the light transmitting sections  112 , is generated in a case where the light condensing section  120  is disposed on an upper side of the light emitting section  110 B, since the respective configurations in the light shielding section  130  and the imaging section  140  satisfy the above-described Expression (1), it is difficult for the stray light to be incident into the light reception elements  142 . In addition, since it is possible to cause the light condensing section  120  to function as the protective substrate, it is possible to make a thickness of the sensor section  150 B, which is a laminated body, be thin, compared to the sensor section  150 . 
     Therefore, in a case where the sensor section  150 B is included in the portable information terminal  100  as the electronic apparatus, it is possible to acquire an image of a blood vessel of the human body M, on which the sensor section  150 B is mounted, and information of a specific component in blood of the blood vessel with high accuracy, and it is possible to realize a thin and lightweight portable information terminal  100 . 
     Third Embodiment 
     &lt;Image Acquisition Device&gt; 
     Subsequently, an image acquisition device according to a third embodiment will be described with reference to  FIG. 10 .  FIG. 10  is a plan view schematically illustrating disposition of light emitting elements and light reception elements in the image acquisition device according to the third embodiment. An image acquisition device  350  according to the third embodiment is different from the sensor section  150  as the bio-information acquisition device according to the first embodiment in the configuration of the light emitting section  110 . Therefore, the same reference symbols are attached to the same components as in the sensor section  150 , and detailed description thereof will not be repeated. 
     The image acquisition device  350  according to the embodiment includes the light emitting section  110 , the light condensing section  120 , the light shielding section  130 , and the imaging section  140 , similarly to the sensor section  150  according to the first embodiment. The respective sections have plate shapes, respectively, and are configured such that the light shielding section  130 , the light condensing section  120 , and the light emitting section  110  are sequentially laminated on the imaging section  140 . Meanwhile, a basic configuration of the image acquisition device  350  may be the same as that of the sensor section  150 B according to the second embodiment. That is, the image acquisition device  350  may be a laminated body in which the light shielding section  130 , the light emitting section  110 , and the light condensing section  120  are sequentially laminated on the imaging section  140 . In the embodiment, the configuration of the light emitting section  110  is different from the first embodiment, and thus the light emitting section  110  is referred to as a light emitting section  110 C. 
     As illustrated in  FIG. 10 , the image acquisition device  350  includes the light reception elements  142  which are disposed in the X direction and the Y direction with prescribed gaps in the imaging section  140 . In addition, the image acquisition device  350  includes approximately circular light transmitting sections  112  around the light reception elements  142  in a planar view, and three types of light emitting elements  30 R,  30 G, and  30 B which are disposed between the light transmitting sections  112  that are located in the X direction and the Y direction with prescribed gaps in the light emitting section  110 C. 
     All the light emitting elements  30 R,  30 G, and  30 B are organic EL elements, emitted red color (R) light is acquired from the light emitting element  30 R, emitted green color (G) light is acquired from the light emitting element  30 G, and emitted blue color (B) light is acquired from the light emitting element  30 B. 
     In addition, an element row, in which the light emitting element  30 R and the light emitting element  30 G are alternately disposed in the X direction, and an element row, in which the light emitting element  30 B and the light emitting element  30 R are alternately disposed in the X direction, are alternately disposed in the Y direction. Therefore, an element column, in which the light emitting element  30 R and the light emitting element  30 B are alternately disposed in the Y direction, and an element column, in which the light emitting element  30 G and the light emitting element  30 R are alternately disposed in the Y direction, are completed. That is, a state is provided in which one light emitting element  30 B, one light emitting element  30 G, and two light emitting elements  30 R are disposed, respectively, around one light reception element  142  (light transmitting section  112 ). Meanwhile, dispositions of the three types of light emitting elements  30 R,  30 G, and  30 B are not limited thereto. In addition, a light emitting element, from which emitted color light other than red (R), green (G), and blue (B) is acquired, may be disposed. 
     The configuration of the reflecting layer  21 , the anode  31 , the partition wall section  23 , the cathode  37 , and the like in each of the light emitting elements  30 R,  30 G, and  30 B is basically the same as in the light emitting elements  30  according to the first embodiment, and light which is leaked from the partition wall section  23  on the outside of the light emitting region  31   b  is reflected on the reflecting layer  21  and is not incident into the side of the light transmitting section  112 . In addition, the relationship, which is acquired in the diameter d of the light receiving surface  142   a  of the light reception elements  142  in the imaging section  140 , the disposition pitch p of the light reception elements  142 , the diameter a of the opening section  133  in the light shielding section  130 , the distance h between the light reception element  142  and the light shielding layer  132 , the refractive index n1 of the empty space  125 , the refractive index n2 of the substrate  131  of the light shielding section  130 , satisfies Expression (1) in the first embodiment. 
     Meanwhile, it is preferable that the film thickness of the interlayer insulation film  22  disposed between the reflecting layer  21  and the anode  31  is set for each of the light emitting elements  30 R,  30 G, and  30 B which have different specific wavelengths from a viewpoint of enhancing intensity of light having the specific wavelength in an optical resonant structure. 
     According to the image acquisition device  350  of the third embodiment, it is possible to reduce the amount of stray light, which is generated due to light emitted from the light emitting section  110 C and is incident into the light receiving surface  142   a  of the light reception elements  142  from the opening section  133 . Therefore, it becomes difficult for the reflected light, which is incident into the light receiving surface  142   a  of the light reception elements  142  from the subject illuminated by the light emitting section  110 C, to be affected by the stray light, and it is possible to realize the image acquisition device  350  which is capable of acquiring a clear image. In addition, since the light emitting section  110 C includes the three types of light emitting elements  30 R,  30 G, and  30 B, it is possible to acquire a color image of the subject. In addition, since it is possible to independently control light emission of the respective light emitting elements  30 R,  30 G, and  30 B, it is possible to acquire an image according to a state of the subject. 
     In a case where the image acquisition device  350  is replaced by, for example, the sensor section  150  in the portable information terminal  100  according to the first embodiment and a finger is imaged as a subject, it is possible to acquire fingerprint information. In a case where the acquired fingerprint information is used, it is possible to perform security management for identifying an operating person. In addition, for example, in a case where influence of the stray light is reduced, it is possible to accurately obtain a change in light absorbance (three wavelengths) due to a change in concentration of the specific component in blood, thereby leading highly-accurate quantitative evaluation of the specific component. 
     The present invention is not limited to the above-described embodiment, appropriate change is possible in a range which does not depart from claims and the gist or the spirit of the invention which is read throughout the specification, and an image acquisition device and a bio-information acquisition device, which involve the change, and an electronic apparatus, to which the image acquisition device and the bio-information acquisition device are applied, are included in a technical range of the present invention. In addition to the embodiments, various modification examples are conceivable. Hereinafter, description will be performed by exemplifying modification examples. 
     Modification Example 1 
     The present invention is not limited to the configuration in which the interlayer insulation film  22  disposed between the reflecting layer  21  and the anode  31  in the light emitting element  30  according to the first embodiment.  FIG. 11  is a sectional view schematically illustrating a structure of the light emitting element according to a modification example. Specifically,  FIG. 11  is a sectional view schematically illustrating the light emitting element taken along a line A-A′ of  FIG. 6( a ) , similarly to  FIG. 7  according to the first embodiment. 
     As illustrated in  FIG. 11 , the light emitting element  30  according to the modification example includes the anode  31  that is directly laminated on the reflecting layer  21  having the light reflection property and that has a light transmission property. The interlayer insulation film  22  is formed such that the outer edges  21   a  and  31   a  of the reflecting layer  21  and the anode  31  are covered and at least the light emitting region  31   b  is exposed in the anode  31 . The partition wall section  23  is formed such that the light emitting region  31   b  is enclosed on the anode  31  and a part thereof overlaps the interlayer insulation film  22 . The end  23   a  on the side of the light transmitting section  112  of the partition wall section  23  is located between the outer edge of the light emitting region  31   b  and the outer edges  21   a  and  31   a  of the reflecting layer  21  and the anode  31 . According to the structure of the light emitting element  30  of the modification example, it is possible to reflect light, which is leaked to the side of the light transmitting section  112 , by the reflecting layer  21  through the partition wall section  23  which is located in the vicinity of the light emitting region  31   b,  similarly to the first embodiment. In addition, it is possible to electrically and easily connect the reflecting layer  21  to the anode  31 . 
     Modification Example 2 
     In each embodiment, the planar shape of the light emitting region  31   b  is not limited to the approximately rhombic shape. For example, the planar shape of the light emitting region  31   b  may be a circular shape or a polygon such as a rectangular shape. 
     Modification Example 3 
     In each embodiment, the reflecting layer  21  is not limited to the reflecting layer which is independently provided for each light emitting element. For example, the reflecting layer  21  may be formed over the plurality of light emitting elements  30 , and the light transmitting section  112  may be formed in a circular shape by removing a part of the reflecting layer  21 , which overlaps the light reception element  142  in a planar view. In this case, the reflecting layer  21  is electrically separated from the anode  31 . 
     Modification Example 4 
     The image acquisition device  350  according to the third embodiment is not limited to the three types of light emitting elements  30 R,  30 G, and  30 B included in the light emitting section  110 C. For example, a configuration may be provided in which one or two types of light emitting elements that are capable of emitting light in a visible light wavelength region are included. Furthermore, a configuration may be provided which includes a light emitting element that emits light in the visible light wavelength region and a light emitting element that emits light in a near-infrared wavelength region. Accordingly, it is possible to acquire image information of the subject and internal bio-information of the subject. 
     Modification Example 5 
     The electronic apparatus, to which the sensor section  150  or the sensor section  150 B as the bio-information acquisition device is applied, is not limited to the portable information terminal  100 . For example, in a case where any one of the sensor sections  150  and  150 B is applied to a personal computer, it is possible to perform biometric authentication which specifies a user of the personal computer from the image of the blood vessel. In addition, it is possible to acquire information of a specific component in blood of the user. 
     In addition, for example, it is possible to apply the present invention to a device, which measures blood pressure, blood sugar, a pulse, a pulse wave, the amount of cholesterol, the amount of hemoglobin, blood water, the amount of oxygen in the blood, and the like, as a medical instrument. In addition, it is possible to measure a liver function (detoxification rate), to check a blood vessel location, and to check a cancer part by using together with pigment. Furthermore, it is possible to determine a benign malignant tumor (melanoma) of a skin cancer by extending knowledge in specimens. In addition, in a case where a part or the whole items are comprehensively determined, it is possible to determine a skin age and an index of a health level of the skin.