JP2007185348A - Bio-information detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bio-information detector which is small and can accurately and unerringly detect bio-information. <P>SOLUTION: The bio-information detector has a light-emitting element 101 formed in an inner piece 107 inserted into the external auditory meatus 110 and irradiate the wall of the external auditory meatus 110 with light, a light-receiving element 104 which receives scattered reflected light from the wall of the external auditory meatus 110, a light emission side lens 102 and a light reception side lens 103 provided in the space between the light-emitting element 101 and the surface of the inner piece 107 or a space between the light receiving element 104 and the surface of the inner piece 107. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a biological information detection device, and more particularly to a biological information detection device that is used by being inserted into an ear canal.

  Conventionally, a pulse oximeter is known as a device for examining biological information, for example, a blood oxygen saturation level or a pulse when it is familiar. A person using a pulse oximeter attaches a near-infrared light sensor to a finger or earlobe. The near-infrared light sensor detects reflected light or transmitted light from an artery under the skin. Thereby, a pulse can be detected.

  An electrocardiograph is known as another example of biological information, for example, a device for detecting a heartbeat. An electrocardiograph detects a weak cardiac activity current from the body surface. Thereby, the heartbeat can be detected.

  For example, Patent Document 1 proposes a configuration for detecting a pulse wave of arterial blood. In this configuration, first, the sensor is inserted into the ear canal. A light emitting element and a light receiving element are provided on the outer periphery of the sensor body. The light emitting element irradiates light to an artery of the ear canal. The light receiving element receives reflected light from the artery. Thereby, the pulse wave of arterial blood is detected. The sensor is also provided with a sound vent.

JP-A-7-241279

  In the type of pulse sensor worn on the finger, the hand must not be moved during the measurement. For this reason, the user feels inconvenience during measurement. Moreover, since the pulse sensor of the type attached to the earlobe has a structure that sandwiches the earlobe, the pulse sensor is easily detached from the earlobe, making it difficult to use. Further, in this type, light easily enters from the side between the pulse sensor and the earlobe. For this reason, it was easy to produce a pulse detection error.

  Furthermore, in the configuration of Patent Document 1, the configuration of the light emitting unit and the light receiving unit is increased. For this reason, it has been difficult to reduce the size of the light emitting unit and the light receiving unit. As a result, there may be a problem that the diameter of the sound ventilation hole along the ear canal becomes thin.

  The light emitting element and the light receiving element are each provided on the upper surface of the cylindrical curved surface. Infrared light emitted from the light emitting element of the light emitting unit is irradiated near the arterial blood vessel existing in the ear canal. The light receiving element is provided on the upper surface of the cylindrical curved surface. For this reason, it becomes an arrangement structure in which the light receiving element is difficult to receive the reflected scattered light from the arterial blood vessel. Therefore, while the direct reflected light from the surface of the ear canal skin can be received with a strong signal intensity, the reflected light from the artery becomes a pulse wave signal with a weak signal intensity. As a result, there is a problem that it is difficult to detect a pulse wave.

  The present invention has been made in view of the above, and an object of the present invention is to provide a biological information detection device that can detect biological information in a small size and accurately.

  In order to solve the above-described problems and achieve the object, according to the present invention, there is provided a biological information detection device that irradiates light on the wall surface of the ear canal and detects biological information based on scattered reflected light from the body. A light emitting means for irradiating light on the wall of the external auditory canal; a light receiving means for receiving the scattered reflected light from the wall of the ear canal; and the light emitting means and the main body. And a light collecting means provided in at least one of the space between the light receiving means and the surface of the main body. it can.

  According to a preferred aspect of the present invention, the light collecting means condenses the light from the light emitting means on the arterial portion in the vicinity of the ear canal, and the light receiving means receives the scattered reflected light from the arterial portion. desirable.

  According to a preferred aspect of the present invention, it is desirable that the light emitting means and the light receiving means are arranged in parallel.

  According to a preferred aspect of the present invention, it is desirable that the light emitting means and the light receiving means are arranged on the same plane.

  According to a preferred aspect of the present invention, the light condensing means is composed of a first substance having a refractive index higher than that of the human body and a second substance or space having a refractive index different from that of the first substance. It is desirable.

  According to a preferred aspect of the present invention, the light-emitting element-side surface of the light collecting means and the light-receiving element-side surface of the light collecting means are non-parallel to the surface of the light-emitting element and the surface of the light-receiving element, respectively. It is desirable to be formed so that

  Further, according to a preferred aspect of the present invention, it is desirable to have an adjustment mechanism that makes the angle between the main body and at least one of the light emitting axis of the light emitting means and the light receiving axis of the light receiving means variable.

  According to a preferred aspect of the present invention, it is desirable to provide a shielding means for preventing scattered reflected light from entering the light receiving element on the surface of the main body.

  ADVANTAGE OF THE INVENTION According to this invention, the biological information detection apparatus which can detect biological information compactly and reliably can be provided.

  Embodiments of a biological information detection apparatus according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  The pulse sensor 100 according to the first embodiment of the present invention will be described. FIG. 1 shows a cross-sectional configuration of a state in which the pulse sensor 100 is inserted into a human ear canal 110. In the back of the ear canal 110, an eardrum 11, a tympanic chamber 12, an ear ossicle 13 and the like are formed. FIG. 2 shows a cross-sectional structure (yz cross section) of the pulse sensor 100. A blood vessel 111 such as an artery or a vein is present around the ear canal 110. Hereinafter, in order to detect a pulse, particularly a pulse wave, an artery as a blood vessel 111 is a measurement target. “Pulse wave” refers to changes in blood pressure, volume, and fluctuations in peripheral blood vessels accompanying the pulsation of the heart. The pulse wave information includes pulse information. Hereinafter, all the sensors of the embodiments can detect a pulse wave, but are collectively referred to as a “pulse sensor” for convenience.

  The pulse sensor 100 has a shape like an inner ear speaker of headphones. Thereby, the pulse sensor 100 can be smoothly inserted into the ear canal 110. The pulse sensor 100 corresponds to a biological information detection device.

  The inner piece 107 is formed of a material such as plastic, for example. The acoustic hole 106 is formed near the center of the inner piece 107. Sound from outside the body passes through the acoustic hole 106 and reaches the eardrum 11. The inner piece 107 corresponds to the main body.

  In addition, a sound electric signal such as music supplied from an unillustrated external unit is converted into sound by the acoustic diaphragm 105. Thereby, the pulse sensor 100 also has a function as an inner ear speaker in addition to a biological information detection function described later.

  FIG. 3 shows the configuration of the pulse sensor 100 taken along the AA section (xz section) in FIG. The light emitting element 101 emits red light or infrared light. The irradiated light is incident on the light-emitting side lens 102. The light emitting side lens 102 is disposed so as to be in contact with the light emitting surface side of the light emitting element 101. The light emitting side lens 102 converges the light from the light emitting element 101 to the blood vessel 111 in the vicinity of the ear canal 110.

  Scattered and reflected light from the blood vessel 111 enters the light-receiving side lens 103. The light receiving side lens 103 guides the scattered reflected light to the light receiving surface of the light receiving element 104. The light receiving side lens 103 is disposed so as to be in contact with the light receiving surface side of the light receiving element 104.

  Here, the light emitting element 101 and the light receiving element 104 are arranged in parallel such that the light emitting axis AX1 and the light receiving axis AX2 are parallel to each other. Further, the outer surface of the inner piece 107 has a cylindrical shape so as to be in contact with the peripheral portion of the ear canal 110. Similarly, the outer surfaces of the light emitting side lens 102 and the light receiving side lens 103 also have a cylindrical shape.

  Although not shown in the drawing, the light emitting element 101 and the light receiving element 104 are connected to a lead wire for supplying power and a signal line, respectively. These signal wires and lead wires connect the pulse sensor 100 to a processing device (not shown) provided outside the body. The processing device is a device that can detect a pulse, such as a pulse oximeter or a finger plethysmograph. The processing device has a function of supplying power, a function of controlling light emission of the light emitting element 101, a function of amplifying a weak received light signal from the light receiving element 104, calculating a pulse rate, and displaying numerical values.

  Next, the operation in this embodiment will be described. The processing device (not shown) outputs a control signal for causing the light emitting element 101 to intermittently emit light or continuously emit light. The light emitting element 101 emits infrared light, for example, in synchronization with the control signal.

  The light emitted from the light emitting element 101 passes through the light emitting side lens 102 and reaches the cylindrical outer surface. The light that has passed through the cylindrical outer surface is incident on the peripheral portion of the ear canal 110. Here, the refractive index of the light-emitting side lens 102 is about 1.9. The refractive index of the human body is about 1.37. For this reason, at the curved interface between the pulse sensor 100 and the human body, the light from the light emitting element 101 is refracted according to the difference in refractive index. Then, the light is converged on the peripheral portion of the ear canal 110 and irradiated on the blood vessel 111.

  In the external auditory canal 110, shallow temporal artery branches and posterior ear artery branches distributed in the auricle extend. By inserting the pulse sensor 100 into the external auditory canal 110, infrared light from the light emitting element 101 is irradiated near the blood vessel 111 in the artery adjacent to the external auditory canal 110 by the light emitting side lens 102.

  The light irradiated to the blood vessel 111 becomes scattered reflected light according to fluctuations in blood pulsation. Then, the scattered reflected light incident on the light receiving side lens 103 is spread so as to efficiently enter the light receiving surface and is incident on the light receiving surface of the light receiving element 104. The light receiving element 104 converts the current into signal current corresponding to the light intensity. The converted signal is output to the processing device described above.

  The light intensity of the reflected light accompanied by the fluctuation of the pulsating flow from the blood vessel 111 is weak compared to the light intensity of the scattered light from each tissue around the ear canal 110. For this reason, only the changing signal is amplified to a signal intensity level that can be processed. The amplified signal is processed as a pulse signal. Then, the pulse wave number is calculated based on the pulse signal. The numerical data of the pulse wave number is displayed on a liquid crystal display unit (not shown).

  The light emitting element 101 is, for example, a semiconductor laser. The emission wavelength of the semiconductor laser is near infrared, for example, about 940 nm. When light in such a wavelength region (frequency) is projected onto the surface of the human body, it reaches the vicinity of the artery existing in the vicinity of the surface of the human body. And there exists a property that the light accompanying the light intensity change according to the pulsation of an artery is scattered and reflected. The pulse sensor 100 utilizes such a property. Note that the emission wavelength of the light-emitting element 101 is not limited to near-infrared light, and may be any wavelength that can detect a pulse in other wavelength regions.

  In FIG. 2, the acoustic diaphragm 105 is not always necessary. In the configuration in which the acoustic diaphragm 105 is not provided, the acoustic hole 106 is formed so as to be out of the cylinder up to the outside of the inner piece 107.

  In this embodiment, the light-emitting side lens 102 and the light-receiving side lens 103 are configured separately. However, the present invention is not limited to this, and the light-emitting side lens 102 and the light-receiving side lens 103 may be configured integrally.

  Further, for example, the surface shape may be convex along the depth direction (y-axis direction) of the ear canal 110. Thereby, it is possible to provide a function of converging light in the depth direction. As a result, it is possible to detect a pulse at an arterial site limited even in the depth direction. In addition, according to this configuration, the signal intensity from the pulse can be detected more strongly than the light converging function in only one direction, and the incidence of scattered reflected light from unnecessary portions can be reduced. As a result, a signal with a higher SN ratio can be obtained.

  According to the present embodiment, biological information such as a pulse can be acquired simply by inserting the pulse sensor 100 into the ear canal 110. For this reason, the user is not restrained during measurement and does not feel inconvenience. Moreover, since it is different from the structure which pinches an earlobe, since the pulse sensor 100 does not come off during measurement, it is easy to use. Furthermore, since the pulse sensor 100 is inserted into the ear canal 110, stray light can be prevented from entering from the side between the pulse sensor 100 and the earlobe. For this reason, a pulse can be detected accurately and reliably. Further, the light emitting element 101 and the light receiving element 104 are accommodated in the inner piece 107. For this reason, the burn resulting from heat_generation | fever of the light emitting element 101 grade | etc., Can be prevented.

  Further, in this embodiment, the light emitting element 101 and the light receiving element 104 can be downsized. Thereby, the pulse sensor 100 can be reduced in size. For this reason, the diameter of the acoustic hole 106 along the ear canal 110 can be increased. Thereby, the sound from the outside can be heard satisfactorily, and the pulse and blood flow pulse wave can be reliably detected stably while listening to music.

  Further, the reflected and scattered light from the blood vessel 111 such as an artery is efficiently guided to the light receiving element 104 by the light receiving side lens 103. For this reason, the light receiving element 104 can detect the reflected light from the artery accurately and reliably. Thus, according to the present embodiment, it is possible to provide a pulse sensor 100 that can detect biological information in a small size and accurately.

  Next, the pulse sensor 200 according to the second embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 4 shows a cross-sectional configuration of the pulse sensor 200. In this embodiment, the light emitting surface of the light emitting element 101 and the light receiving surface of the light receiving element 104 are configured to be parallel. Here, the light emitting axis AX1 and the light receiving axis AX2 are parallel to each other, and the center position between the light emitting axis AX1 and the light receiving axis AX2 is arranged to coincide with the boundary AX3 between the light emitting side lens 102 and the light receiving side lens 103. Thereby, even when the element sizes of the light emitting element 101 and the light receiving element 104 are different, the reflected light reflected and returned from the blood vessel 111 can be efficiently received by the light receiving element 104.

  Further, the light emitting element 101 and the light receiving element 104 are each formed on the substrate 120. The substrate 120 is made of silicon. The light emitting element 101 and the light receiving element 104 are formed on the surface of the substrate 120 by a MEMS technique together with a light emission driving circuit and a light receiving signal amplifier circuit (not shown). With this structure, the luminescence heat of the light emitting element 101 can be propagated to the substrate 120. Thereby, it is possible to prevent heat from being locally concentrated on the light emitting element 101. Also, with this configuration, the manufacturing cost of the pulse sensor 200 can be reduced.

  In this embodiment, the cylindrical shape of the inner piece 107 can be used as it is as an optical lens. For this reason, manufacture of the pulse sensor 200 becomes easy and mass production becomes possible.

  Next, the pulse sensor 300 according to the third embodiment of the invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 5 shows a cross-sectional configuration of the pulse sensor 300. In this embodiment, the light emitting surface of the light emitting element 101 and the light receiving surface of the light receiving element 104 are non-parallel and face each other slightly inward, in other words, at a fan-shaped angle.

  With this configuration, the optical path length can be shortened. For this reason, it is possible to irradiate light to the blood vessel 111 that is close to the ear canal 110 and is shallow from the surface of the human skin. Thereby, the light receiving element 104 can receive scattered and reflected light from a shallow portion from the surface of the skin.

  In this embodiment, the light emitting surface of the light emitting element 101 and the light receiving surface of the light receiving element 104 are configured to face each other slightly inward. However, the present invention is not limited to this, and a configuration in which the light emitting surface of the light emitting element 101 and the light receiving surface of the light receiving element 104 are inclined in the opposite direction may be employed. At this time, light can be irradiated to blood vessels (arteries) existing deeper than the surface of the ear canal 110. As a result, the light receiving element 104 can receive scattered reflected light from a deeper region.

  Next, a pulse sensor 400 according to Embodiment 4 of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 6 shows a cross-sectional configuration of the pulse sensor 400. The surface of the pulse sensor 400 can detect a pulse without necessarily contacting the inner wall of the ear canal 110. The same applies to the pulse sensors 100, 200, and 300 in the first to third embodiments. However, in this embodiment, the pulse sensor 400 has a configuration that is safe for the user even if it touches the skin surface.

  As shown in FIG. 6, between the light emitting surface of the light emitting element 101 and the surface S1 of the light emitting side lens 102 on the light emitting element 101 side, and the light receiving surface of the light receiving element 104 and the surface S2 of the light receiving side lens 103 on the light receiving element 104 side. Between these, spaces 401 are provided. As a result, heat generated by the light emitting element 101 and the light receiving element 104 can be prevented from being directly transmitted to the light emitting side lens 102 and the light receiving side lens 103. Thereby, even if the light-emitting side lens 102 and the light-receiving side lens 103 touch the skin surface of the ear canal 110, it is possible to prevent the user from getting burned.

  As described above, in this embodiment, the light-emitting side lens 102 and the light-receiving side lens 103 are configured by the first substance having a higher refractive index than the human body and the space having a refractive index different from that of the first substance. . Instead of the space 401, a second material having a refractive index different from that of the first material can be used. For example, optical glass can be used as the first substance and the second substance. In addition, the light-emitting element 101 and the light-receiving element 104 can be sealed with a second substance. For this reason, manufacture of the pulse sensor 400 becomes easy.

  FIG. 7 shows a cross-sectional configuration in the vicinity of the light emitting element 101 in a modification of the present embodiment. In this modification, an adjustment mechanism for adjusting the inclination of the light emitting element 101 is provided. Note that the inclination of the light receiving element 104 can be adjusted with the same configuration as the light emitting element 101. For this reason, the light emitting element 101 will be described as an example.

  The piezoelectric actuator 122 is a so-called sliding type, and is formed so as to be slidable on the surface of the fixed substrate 120. The light emitting element 101 is formed on the second substrate 121. One end of the second substrate 121 is fixed to the substrate 120. A piezoelectric actuator 122 is provided between the other end of the second substrate 121 and the substrate 120. Here, the substrate 120 and the second substrate 121 form an angle θ. And the piezoelectric actuator 122 can slide in the left-right direction in the figure. Thereby, the inclination of the second substrate 121 changes. As a result, the inclination of the light emitting surface of the light emitting element 101 can be changed.

  As the piezoelectric actuator 122, for example, an electrostatic actuator, a magnetic actuator, a thermal actuator, a piezoelectric actuator, an electrostatic motor, or the like based on MEMS technology can be used. Thereby, it is possible to control from the state where the light emission axis AX1 is perpendicular to the substrate 120 to the state where the light emission axis AX1 and the substrate 120 are inclined by a predetermined angle.

  As a result, the convergence position in the depth direction can be changed so that the light converges on the portion of the blood vessel 111 existing deeper than the surface of the ear canal 110. For example, when the signal intensity of the pulse detection signal is weak, the tilt angle of the light emitting element 101 or the light receiving element 104 can be controlled by this adjustment mechanism so that the detection signal from the blood vessel 111 is as large as possible. Further, the tilt angle of the light emitting element 101 and the light receiving element 104 can be adjusted so that unnecessary scattered light does not enter the light receiving element 104. As described above, the inclination angle of the light receiving element 104 can also be adjusted by the same adjustment mechanism as that of the light emitting element 101.

  Next, a pulse sensor 500 according to Embodiment 5 of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 8 shows a cross-sectional configuration of the pulse sensor 500. In the present embodiment, a space 401 similar to the configuration of the fourth embodiment is provided, and the surface S1 of the light emitting side lens 102 on the light emitting element 101 side is inclined so as not to be parallel to the light emitting surface. Similarly, the surface S2 of the light receiving side lens 103 on the light receiving element 104 side is inclined so as not to be parallel to the light receiving surface.

  In this way, by providing the surfaces S1 and S2 with an inclination, it is possible to irradiate light to the blood vessel 111 that is close to the external auditory canal 110, that is, shallow from the surface of the skin. Thereby, the light receiving element 104 can receive the scattered reflected light from the shallow portion.

  In this embodiment, the slope formed by the two surfaces S1 and S2 is concave. On the other hand, if the slope formed by the two surfaces S1 and S2 is convex, light can be applied to the blood vessel 111 existing deeper than the surface of the ear canal 110. Thereby, the light receiving element 104 can receive the scattered reflected light from a deeper portion.

  In the present embodiment, a plurality of units in which the light-emitting side lens 102 and the light-receiving side lens 103 are combined can be prepared so that the angles formed by the surfaces S1 and S2 are different. At this time, the local radius of the cylindrical shape on the surface of the unit is set to the same value. Then, by appropriately replacing these units, the inclination angle formed by the two surfaces S1 and S2 can be made variable.

  When the refractive index of the light emitting side lens 102 and the light receiving side lens 103 is 1.9, the angle formed by the surface S1 or the surface S2 and the horizontal line is 5 ° to 10 °. Furthermore, preferably this angle is 7 °.

  Next, a pulse sensor 600 according to Embodiment 6 of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 9 shows a cross-sectional configuration of the pulse sensor 600. In this embodiment, a shielding portion 301 is formed on the outer surface of the light emitting side lens 102 and the outer surface of the light receiving side lens 103. The shielding unit 301 has a function of preventing unnecessary scattered reflected light from near the surface of the ear canal 110. The shielding part 301 is made of a thin material and does not transmit near infrared light, for example, a black material. Thereby, it is possible to prevent the emission of unnecessary light leakage light from the light emitting element 101, and to prevent unnecessary scattered reflected light from other than the blood vessel 111 from entering the light receiving element 104. As a result, a weak pulse signal can be detected with low noise.

  The shielding unit 301 is not limited to the configuration provided on both the outer surface of the light-emitting side lens 102 and the outer surface of the light-receiving side lens 103. For example, the light shielding part 601 may be provided only on the outer surface of the light emitting side lens 102, or the light shielding part 601 may be provided only on the outer surface of the light receiving side lens 103. As described above, as long as there is a function of preventing unnecessary scattered reflected light, the position of the light shielding portion 601 may be any position.

  In each of the embodiments described above, an aspherical lens or a gradient index lens can be used as the light emitting side lens 102 and the light receiving side lens 103. As a result, the light can be converged to a desired position or can be spread and guided more efficiently. Furthermore, stray light and unnecessary reflected light can be reduced by forming an antireflection film or a multilayer film on the optical surface. As a result, detection with a high SN ratio can be performed.

  Moreover, in each Example, the inner piece of a different magnitude | size can also be prepared. Thereby, when measuring an adult and when measuring a child, it is possible to exchange and use an inner piece having an optimum size. Furthermore, the biological information detection apparatus of the present invention can detect, for example, body temperature in addition to a pulse wave and a pulse as biological information. As described above, the present invention can take various modifications without departing from the spirit of the present invention.

  As described above, the biological information detection apparatus according to the present invention is useful for an apparatus that detects biological information, particularly pulse waves.

It is a figure which shows the state which has inserted the pulse sensor which concerns on Example 1 of this invention into the ear canal. It is a figure which shows the cross-sectional structure of the pulse sensor of Example 1. FIG. It is another figure which shows the cross-sectional structure of the pulse sensor of Example 1. FIG. It is a figure which shows the cross-sectional structure of the pulse sensor which concerns on Example 2 of this invention. It is a figure which shows the cross-sectional structure of the pulse sensor which concerns on Example 3 of this invention. It is a figure which shows the cross-sectional structure of the pulse sensor which concerns on Example 4 of this invention. FIG. 10 is a diagram illustrating a cross-sectional configuration of a pulse sensor according to a modification example of Example 4. It is a figure which shows the cross-sectional structure of the pulse sensor which concerns on Example 5 of this invention. It is a figure which shows the cross-sectional structure of the pulse sensor which concerns on Example 6 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Pulse sensor 101 Light emitting element 102 Light emitting side lens 103 Light receiving side lens 104 Light receiving element 105 Acoustic diaphragm 106 Acoustic hole 107 Inner piece 110 Ear canal 111 Blood vessel 120 First substrate 121 Second substrate 122 Piezoelectric actuator 200, 300, 400 Pulse sensor 401 Space 601 Light-shielding part 11 Tympanic membrane 12 Tympanic chamber 13 Ear ossicle S1, S2 surface AX1 Light emission axis AX2 Light reception axis AX3 Boundary

Claims (8)

A biological information detection device that irradiates light on the wall of the ear canal and detects biological information based on scattered reflected light from the body,
A light emitting means that is formed in a main body to be inserted into the ear canal and that irradiates light to the wall surface of the ear canal;
A light receiving means that is formed in the main body and receives scattered and reflected light from the body;
Condensing means provided in at least one of the space between the light emitting means and the surface of the main body and the space between the light receiving means and the surface of the main body. A biological information detection apparatus. The condensing means condenses the light from the light emitting means on the arterial portion near the ear canal,
The living body information detecting apparatus according to claim 1, wherein the light receiving unit receives scattered reflected light from the artery portion.   The biological information detection apparatus according to claim 1, wherein the light emitting unit and the light receiving unit are arranged in parallel.   The biological information detection apparatus according to claim 1, wherein the light emitting unit and the light receiving unit are arranged on the same plane.   2. The condensing means includes a first substance having a higher refractive index than that of a human body and a second substance or space having a refractive index different from that of the first substance. The biological information detection apparatus according to any one of -4.   The surface on the light emitting element side of the light collecting means and the surface on the light receiving element side of the light collecting means are formed so as to be non-parallel to the surface of the light emitting element and the surface of the light receiving element, respectively. The biological information detecting device according to claim 1, wherein the biological information detecting device is a biological information detecting device.   The adjustment mechanism which makes variable the angle which at least one axis | shaft of the light emission axis | shaft of the said light emission means and the light reception axis | shaft of the said light reception means and the said main body has is variable. The biological information detection device described.   The biological information detection apparatus according to claim 1, wherein a shielding unit that prevents scattered reflected light from entering the light receiving element is provided on the surface of the main body.

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