Light emitting module and smart phone

Abstract

To provide a light emitting module capable of emitting white light and outputting biometric light receiving information used to acquire biometric information.SOLUTION: A light emitting module has a substrate, at least one light source arranged on the substrate, at least one light receiving element arranged on the substrate, a lens arranged opposite the light source and the light receiving element, at least one light source is capable of emitting white light consisting of a mixture of red light, green light, and blue light, and at least one light receiving element outputs biometric light receiving information obtained by receiving at least one of the reflected light and the scattered light by the living body of the light emitted from the at least one light source.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a light-emitting module and a smartphone.

Background Art

[0002] For example, Patent Document 1 discloses a light-emitting module that irradiates light from a flash lamp.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An embodiment according to the present disclosure aims to provide a light-emitting module that can irradiate white light and output biological light reception information used to acquire biological information.

Means for Solving the Problems

[0005] A light-emitting module according to an embodiment of the present disclosure includes a substrate, at least one light source disposed on the substrate, at least one light-receiving element disposed on the substrate, and a lens disposed opposite to the light source and the light-receiving element. The at least one light source can emit white light composed of mixed light of red light, green light, and blue light, and the at least one light-receiving element outputs biological light reception information obtained by receiving at least one of reflected light and scattered light of the light emitted from the at least one light source by a living body.

Effects of the Invention

[0006] According to an embodiment of the present disclosure, it is possible to provide a light-emitting module that can irradiate white light and output biological light-receiving information used for acquiring biological information.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Embodiments for Carrying Out the Invention

[0008] The light-emitting module and smartphone according to the embodiments of the present disclosure will be described in detail with reference to the drawings. However, the embodiments shown below are examples of a light-emitting module and a smartphone for embodying the technical idea of the present disclosure, and are not limited thereto. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present disclosure only thereto without specific description, but are merely illustrative examples. Note that the sizes and positional relationships of the members shown in each drawing may be exaggerated for clarity of explanation. Also, in the following description, the same names and reference numerals indicate the same or similar members, and detailed descriptions thereof are appropriately omitted. As a cross-sectional view, an end view showing only the cut surface may be used in some cases.

[0009] Also, hereinafter, in order to make the explanation easier to understand, the arrangement and configuration of each part will be described using an XYZ orthogonal coordinate system. The X-axis, Y-axis, and Z-axis are mutually orthogonal. Also, the direction in which the X-axis extends is referred to as the "X direction", the direction in which the Y-axis extends is referred to as the "Y direction", and the direction in which the Z-axis extends is referred to as the "Z direction".

[0010] In the X direction, the direction in which the arrow points is referred to as the "+X direction" or the "+X side", and the direction opposite to the +X direction is referred to as the "-X direction" or the "-X side". Similarly, in the Y direction, the direction in which the arrow points is referred to as the "+Y direction" or the "+Y side", and the direction opposite to the +Y direction is referred to as the "-Y direction" or the "-Y side". In the Z direction, the direction in which the arrow points is referred to as the "+Z direction", the "+Z side" or the "upper side", and the direction opposite to the +Z direction is also referred to as the "-Z direction", the "-Z side" or the "lower side". However, these merely describe the relationships such as relative positions, orientations, and directions, and do not have to match the relationships during use. Also, these directions are independent of the direction of gravity.

[0011] In the embodiment, as an example, the light source included in the light-emitting module emits light in the +Z direction. Also, the surface of the object when viewed from the +Z direction is defined as the "upper surface", and the surface of the object when viewed from the -Z direction is defined as the "lower surface". In the embodiments shown below, along the X-axis, Y-axis, and Z-axis includes that the object has an inclination within a range of ±10° with respect to these axes. Also, in this embodiment, orthogonality may include an error within ±10° with respect to 90°.

[0012] In this specification or the claims, when there are a plurality of certain components and they are to be distinguished and expressed separately, they may be distinguished by adding "first", "second", etc. to the head of those components. Also, there may be cases where the objects to be distinguished are different between this specification and the claims.

[0013] [First Embodiment] <Configuration of the Light-Emitting Module According to the First Embodiment> Referring to FIGS. 1 to 5, the light-emitting module according to the first embodiment will be described. FIG. 1 is a schematic top view showing an example of the light-emitting module 100 according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing line II-II in FIG. 1. FIG. 3 is a diagram showing an example of the emission spectra of the red light source 120r, green light source 120g, and blue light source 120b of the light-emitting module 100. FIG. 4 is a diagram showing an example of the reflection spectrum of a metal. FIG. 5 is a diagram showing an example of the emission spectrum of the white light source 120w1 of the light-emitting module 100.

[0014] In FIG. 2, part of the light emitted from the light source 120 included in the light-emitting module 100 is indicated by an arrow as the emitted light L1, and part of the light incident on the light-emitting module 100 from outside the light-emitting module 100 is indicated by an arrow as the incident light L2. Further, in FIG. 2, for the purpose of showing that the central axis D1 of the substrate 110, the rotation axis D2 of the substrate 110, and the optical axis D3 of the lens 131 are substantially coincident, the symbols of the central axis D1, the rotation axis D2, and the optical axis D3 are shown together. There may be cases where symbols are shown together for the same purpose hereinafter. Note that the arrow L2 in FIG. 2 is shown with omission of the change in the traveling direction due to the refractive index difference between members for simplification of the explanation.

[0015] As shown in FIGS. 1 and 2, the light-emitting module 100 includes a substrate 110, at least one light source 120 disposed on the substrate 110, at least one light-receiving element 200 disposed on the substrate 110, and a lens 131 disposed to face the light source 120 and the light-receiving element 200. At least one light source 120 can emit white light composed of a mixed color light of red light, green light, and blue light. At least one light-receiving element 200 outputs biological light-receiving information DL obtained by receiving at least one of the reflected light and the scattered light of the light emitted from at least one light source 120 by a living body.

[0016] In the present embodiment, at least one light source 120 includes a plurality of light sources 120. The plurality of light sources 120 include a red light source 120r that emits red light, a green light source 120g that emits green light, a blue light source 120b that emits blue light, and an infrared light source 120i that emits infrared light. Also, in the example shown in FIG. 1, the plurality of light sources 120 include a white light source 120w1 that emits white light. At least one light-receiving element 200 outputs biological light-receiving information DL obtained by receiving at least one of the reflected light and the scattered light of the light emitted from the plurality of light sources 120 by a living body.

[0017] In the example shown in FIG. 1, for the purpose of indicating that a plurality of light sources 120 include a red light source 120r, a green light source 120g, a blue light source 120b, an infrared light source 120i, and a white light source 120w1, the reference numeral of the light source 120 is also noted together with the reference numerals of the red light source 120r, the green light source 120g, the blue light source 120b, the infrared light source 120i, and the white light source 120w1 respectively. There may be cases where reference numerals are noted together for the same purpose hereinafter. Also, in the example shown in FIG. 2, the biological light reception information DL represents information output from the light receiving element 200 and output via the control unit 150 or the like.

[0018] The light emitting module 100 can irradiate the irradiated surface P with white light emitted from at least one light source 120. The irradiated surface P shown in FIG. 1 is a virtual surface. Also, the processor 210 that receives the biological light reception information DL output from the light emitting module 100 can acquire biological information Db regarding a living body based on the biological light reception information DL. As described above, in the present embodiment, it is possible to provide the light emitting module 100 that can irradiate white light and can output the biological light reception information DL used for acquiring the biological information Db. Note that the light emitting module 100 includes a memory separately from the processor 210, and the processor 210 may acquire the biological information Db with reference to information stored or temporarily stored in the memory. Also, the light emitting module 100 may output the biological light reception information DL to an external device such as a PC (Personal Computer), a smartphone, or a smartwatch, and this external device may acquire the biological information Db based on the biological light reception information DL.

[0019] The biological light reception information DL is, for example, analog voltage information output from the light receiving element 200. The biological light reception information DL includes at least analog current information obtained from at least one of the reflected light and the scattered light of at least green light by a living body, analog current information obtained from at least one of the reflected light and the scattered light of red light and infrared light by a living body, and the like. The analog current information (that is, the biological light reception information DL) received by the light receiving element 200 is converted into biological information Db regarding a pulse and blood oxygen concentration via the processor 210.

[0020] The light-emitting module 100 can emit light individually from light sources that can emit light of an appropriate wavelength as needed during vital checks by driving a plurality of light sources 120, namely a red light source 120r, a green light source 120g, a blue light source 120b, and an infrared light source 120i, individually. Thereby, even if the light-emitting module 100 has only one light-receiving element 200, by associating it with the light source that is emitting light among the plurality of light sources 120, the color of the light from the living body received by the light-receiving element 200 can be recognized.

[0021] The light-emitting module 100 can emit white light composed of mixed light of red light, green light, and blue light by driving the red light source 120r, the green light source 120g, and the blue light source 120b simultaneously. Here, in the present embodiment, the white light obtained from the mixed light of red, green, and blue has three peaks as peak wavelengths in the wavelength ranges of red, green, and blue as the emission spectrum. At this time, in the mixed light of red light, green light, and blue light, a wavelength range with a small light amount is likely to occur in the wavelength range between each peak. In particular, a wavelength range with a small light amount is likely to occur in the wavelength range of orange, which is in the middle of red and green. For this reason, when this white light is used as a flash light source for a camera or the like, there is a possibility that reflected light in which the color of the object is accurately reflected cannot be obtained. For example, in the example shown in FIG. 3, a red light relative light amount distribution 31, a green light relative light amount distribution 32, a blue light relative light amount distribution 33, and a boundary wavelength range 34 are shown. The relative light amount distribution shown in FIG. 3 means the distribution of the relative light amount for each wavelength. The boundary wavelength range 34, which is in the wavelength range near 600 nm, is the wavelength range near 600 nm between the red light relative light amount distribution 31 and the green light relative light amount distribution 32, and represents a wavelength range with a small light amount.

[0022] On the one hand, in the example shown in FIG. 4, a reflectance distribution 51 of copper which is a solid-line graph, a reflectance distribution 52 of silver which is a dashed-line graph, and a reflectance distribution 53 of gold which is a dash-dotted line graph are shown. The reflectance distribution in FIG. 4 means the distribution of reflectance for each wavelength. For example, in the reflectance distribution 51 of copper, the reflectance is larger in the wavelength range of 600 nm or more compared to the wavelength range of less than 600 nm. Therefore, since the amount of light in the wavelength range near 600 nm of the light irradiated on copper is small, there is a possibility that reflected light that correctly reflects the color of copper cannot be obtained. For this reason, when using white light having a wavelength range with a small amount of light for the flash use of a camera, reflected light that correctly reflects the color of the object may not be obtained, and the captured image may not be able to accurately represent the color of the object.

[0023] On the other hand, the light-emitting module 100 includes a white light source 120w1 in the plurality of light sources 120. The white light source 120w1 includes, for example, a light-emitting element that emits blue light and a phosphor that emits yellow light excited by the blue light. Therefore, as shown in FIG. 5, the white light source 120w1 includes a large amount of light in the boundary wavelength range 34 near 600 nm. For this reason, the light-emitting module 100 can supplement the amount of light in the boundary wavelength range 34 that is insufficient only with the emitted light from the red light source 120r, the green light source 120g, and the blue light source 120b with the emitted light from the white light source 120w1. Thereby, for example, an imaging device that performs imaging using the irradiation light from the light-emitting module 100 can obtain reflected light that correctly reflects the color of the object, and can perform imaging that accurately represents the color of the object.

[0024] In addition, by including the white light source 120w1, the red light source 120r, the green light source 120g, and the blue light source 120b in the plurality of light sources 120, the light-emitting module 100 can adjust the color temperature of the white light emitted from the light-emitting module. Thereby, in an imaging device that performs imaging using the irradiation light from the light-emitting module 100, white light having a desired color temperature can be emitted.

[0025] Also, in the example shown in FIG. 2, the light-emitting module 100 has a processor 210 capable of outputting biological information Db based on the biological light-receiving information DL output from the light-receiving element 200. The processor 210 is constituted by a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.

[0026] In the example shown in FIG. 2, the processor 210 obtains biological information Db by calculation based on the biological light-receiving information DL received from the light-receiving element 200 via the control unit 150. By having the processor 210, the light-emitting module 100 can output the biological information Db to an external device. The biological information Db is, for example, pulse information, blood oxygen concentration information, or the like. The biological information Db is calculated using a digital signal obtained by analog-digital conversion of the biological light-receiving information DL which is an analog voltage signal. Here, the external device is a PC, a smartphone, a smartwatch, a tablet terminal, a display device such as a liquid crystal display, a storage device such as an HDD (Hard Disk Drive), a communication device connected to a network, or the like.

[0027] In the light-emitting module 100, the plurality of light sources 120 may be arranged linearly or in a matrix, or may be arranged in a circular ring. Among these, in the light-emitting module 100, it is preferable that the plurality of light sources are arranged in a circular ring. In the example shown in FIG. 1, two red light sources 120r, two green light sources 120g, two blue light sources 120b, and one infrared light source 120i are arranged in a circular ring on the upper surface of the substrate 110. By arranging the plurality of light sources 120 in a circular ring, light can be irradiated in a direction symmetric with respect to the center of the circular ring. Thereby, the direction dependence of the light reception sensitivity of at least one of the reflected light and the scattered light by the living body can be reduced. For example, if the plurality of light sources 120 are arranged linearly and are biased in one direction, there may be a direction dependence in the light reception sensitivity of at least one of the reflected light and the scattered light by the living body. The direction dependence of the sensitivity means a difference in the light reception sensitivity according to the direction, such as the light reception sensitivity from other directions being lower compared to the light reception sensitivity of light from a predetermined direction. In the present embodiment, by arranging the plurality of light sources in a circular ring, the direction dependence of the light reception sensitivity can be reduced. And in the light-emitting module 100, the acquisition accuracy of the biological information Db based on the biological light reception information DL can be increased.

[0028] Further, for example, if there is an inhibitory element such as a tattoo that absorbs light emitted from a plurality of light sources 120 on a part of the living body that acquires the biological light reception information DL, the irradiated light may be absorbed by the inhibitory element at the irradiated position. When the irradiated light is absorbed, the amount of received light by the light receiving element 200 decreases, which may reduce the acquisition accuracy of the biological information Db based on the biological light reception information DL. On the other hand, in the light emitting module 100, as shown in FIGS. 1 and 2, the substrate 110 has a drive unit 140 that can rotate with the circular annular central axis D1 as the rotation axis D2. The central axis D1 is an axis substantially parallel to the normal line of the substrate 110 (for example, a line extending in the Z direction), and means an axis passing through the center of the circular annulus in a top view. The light emitting module 100 can rotate the plurality of light sources 120 arranged in a circular annulus around the rotation axis D2 by rotating the substrate 110 by the drive unit 140. As the irradiation position from the light emitting module 100 moves on the living body according to the rotation of the plurality of light sources 120, the light emitting module 100 can receive at least one of the reflected light and the scattered light from a portion without an inhibitory element such as a tattoo by the light receiving element 200. As a result, in the present embodiment, compared with the case where the plurality of light sources 120 do not move, the influence of the inhibitory element such as a tattoo can be reduced, and the acquisition accuracy of the biological information Db based on the biological light reception information DL can be increased.

[0029] Also, in the example shown in FIG. 2, the rotation axis D2 of the substrate 110 by the drive unit 140 coincides with the optical axis D3 of the lens 131. Thereby, in the light emitting module 100, compared with at least one of the cases where the rotation axis D2 of the substrate 110 is tilted or shifted with respect to the optical axis D3 of the lens 131, the light distribution control of the light emitted from the plurality of light sources 120 by the lens 131 can be facilitated.

[0030] Also, in the example shown in FIG. 2, the light-emitting module 100 has a control unit 150 capable of controlling the emission of light from a plurality of light sources 120. The control unit 150 includes, for example, a CPU and a memory. The light-emitting module 100 can switch between the emission of white light and the emission of light when outputting the biological light reception information DL by the control unit 150. Further, the light-emitting module 100 can increase the acquisition accuracy of the biological information Db by controlling the light amount for each color according to the characteristics of the living body that acquires the biological information Db by the control unit 150.

[0031] Hereinafter, the details of the configuration in the light-emitting module 100 will be described.

[0032] (Substrate 110) In the example shown in FIG. 2, the substrate 110 is a wiring substrate having a resin layer 111 and a plurality of wirings 112. The surface of the substrate 110 includes an upper surface 110a and a lower surface 110b located on the opposite side of the upper surface 110a. The upper surface 110a and the lower surface 110b are substantially flat and substantially parallel to the XY plane. The plurality of wirings 112 are provided on at least the upper surface 110a of the substrate 110. The wiring 112 may be further provided on the lower surface 110b and / or inside the substrate. In the example shown in FIG. 1, the shape of the outer edge of the substrate 110 in a top view is substantially circular. However, the shape of the outer edge of the substrate 110 in a top view is not limited to the above, and may be substantially rectangular, substantially elliptical, substantially polygonal, or the like.

[0033] (Light source 120) In the example shown in FIG. 1, a plurality of light sources 120 are arranged on the substrate 110, in other words, on the upper surface 110a of the substrate 110. Each of the plurality of light sources 120 includes a light emitting element 121 which is a semiconductor laminate, and at least a pair of electrodes 122 and 123 arranged on the lower surface of the light emitting element 121. The red light source 120r has a light emitting element 121 that emits red light. The green light source 120g has a light emitting element 121 that emits green light. The blue light source 120b has a light emitting element 121 that emits blue light. The infrared light source 120i has a light emitting element 121 that emits infrared light. Note that the red light source 120r, the green light source 120g, and the infrared light source 120i may each be a light source including a phosphor that emits red light, green light, and infrared light, respectively, as a wavelength conversion member disposed on a light emitting element that emits blue light.

[0034] The light emitting element 121 is, for example, an LED (Light Emitting Diode). A substrate having translucency or a substrate having translucency and light diffusibility may be further arranged on the semiconductor laminate of the light emitting element 121. The translucency of the substrate arranged on the semiconductor laminate is preferably such that the transmittance with respect to the light emitted from the light emitting element 121 is 60% or more.

[0035] The light emitting element 121 includes an n-type semiconductor layer, an active layer, and a p-type semiconductor layer. The shape of the outer edge of the light emitting element 121 in a bottom view is a quadrilateral in which two opposite sides of the four sides are substantially parallel in the X direction and the remaining two opposite sides of the four sides are substantially parallel in the Y direction. The light emitting element 121, in other words, the light source 120, is, for example, a quadrilateral having a side length of 50 μm or more and 1000 μm or less on the upper surface. However, the shape of the outer edge of the light emitting element 121 in a bottom view is not limited to the above.

[0036] One of the pair of electrodes 122 and 123 is electrically connected to the n-type semiconductor layer of the light emitting element 121, and the other is electrically connected to the p-type semiconductor layer of the light emitting element 121. Also, the electrodes 122 and 123 of the plurality of light sources 120 are electrically connected to the plurality of wirings 112 of the substrate 110, respectively. Therefore, the output of each light source 120 can be controlled individually.

[0037] The shapes of the pair of electrodes 122 and 123 and the direction in which they are arranged can be appropriately selected. For example, the pair of electrodes 122 and 123 may have different shapes so that it is easy to distinguish the electrode electrically connected to the p-type semiconductor layer from the electrode electrically connected to the n-type semiconductor layer. Also, the pair of electrodes 122 and 123 are arranged in the X direction or the Y direction, and the shapes of the pair of electrodes 122 and 123 may be substantially rectangular, substantially circular, substantially elliptical, or substantially polygonal, etc.

[0038] (Light receiving element 200) In the example shown in FIG. 1, the light receiving element 200 is disposed on the substrate 110, in other words, on the upper surface 110a of the substrate 110. In the example shown in FIG. 1, the light receiving element 200 is disposed in a part of a circular ring formed by a plurality of light sources 120 disposed on the upper surface 110a of the substrate 110. In the example shown in FIG. 2, the light receiving element 200 includes a photoelectric conversion unit 201 that is a semiconductor laminate, and at least a pair of electrodes 202 and 203 disposed on the lower surface of the photoelectric conversion unit 201.

[0039] The light receiving element 200 is, for example, a PD (Photo Diode). The light receiving element 200 can convert the light energy of the received light into electrical energy and output a signal regarding a current value corresponding to the light energy as biological light reception information DL. A substrate having translucency or an antireflection film, etc. may be further disposed on the semiconductor laminate. The translucency of the substrate disposed on the semiconductor laminate preferably has a transmittance of 60% or more with respect to the light emitted from the light emitting element 121.

[0040] The photoelectric conversion unit 201 is composed of a pn junction of an n-type semiconductor layer and a p-type semiconductor layer. The shape of the outer edge of the photoelectric conversion unit 201 in a bottom view is a quadrilateral in which two opposite sides of the four sides are generally parallel in the X direction and the remaining two opposite sides of the four sides are substantially parallel in the Y direction. However, the shape of the outer edge of the photoelectric conversion unit 201 in a bottom view is not limited to the above.

[0041] One of the pair of electrodes 202 and 203 is electrically connected to the n-type semiconductor layer of the photoelectric conversion unit 201, and the other is electrically connected to the p-type semiconductor layer of the photoelectric conversion unit 201. Further, the electrodes 202 and 203 of the photoelectric conversion unit 201 are electrically connected in pairs to the plurality of wirings 112 of the substrate 110.

[0042] The shape of each of the pair of electrodes 202 and 203 and the direction in which they are arranged can be appropriately selected. For example, the pair of electrodes 202 and 203 may have different shapes so that it is easy to distinguish between the electrode electrically connected to the p-type semiconductor layer and the electrode electrically connected to the n-type semiconductor layer. Further, the pair of electrodes 202 and 203 are arranged in the X direction or the Y direction, and the shape of each of the pair of electrodes 202 and 203 may be substantially rectangular, substantially circular, substantially elliptical, or substantially polygonal, etc. Further, at least one of the pair of electrodes 202 and 203 may be disposed on the upper surface of the light receiving element 200. In this case, at least one of the electrodes 202 and 203 disposed on the upper surface of the light receiving element 200 is electrically connected to the plurality of wirings 112 of the substrate 110 via a conductive member such as a wire.

[0043] The area of the light receiving surface of the light receiving element 200 is preferably larger than the area of the light emitting surface of the light source 120. By making the area of the light receiving surface of the light receiving element 200 larger than the area of the light emitting surface of the light source 120, the light receiving sensitivity of the light receiving element 200 can be increased as compared with the case where the area of the light receiving surface is less than or equal to the area of the light emitting surface. As a result, when acquiring the biological information Db, the amount of light emitted from the light source 120 can be reduced, so that damage to the skin of the living body irradiated with the emitted light can be reduced, and the skin of the living body becoming rough can be reduced.

[0044] (Lens 131) Light emitted from the plurality of light sources 120 is incident on the lens 131. The lens 131 is disposed above the plurality of light sources 120 and is separated from the plurality of light sources 120. The shortest distance between the lens 131 and the plurality of light sources 120 is, for example, 50 μm or more and 1000 μm or less. The lens 131 is a rotationally symmetric body with the rotation axis D2 of the substrate 110 as the central axis. Here, the rotationally symmetric body means a three-dimensional body having rotational symmetry. The rotation axis D2 of the substrate 110 substantially coincides with the optical axis D3 of the lens 131.

[0045] In the example shown in FIG. 2, the lens 131 is a lens having a convex surface protruding toward the plurality of light sources 120. The lens 131 includes a light incident surface 131a facing the plurality of light sources 120 and a light emission surface 131b located on the opposite side of the light incident surface 131a. The light incident surface 131a is a convex surface protruding toward the plurality of light sources 120. The light emission surface 131b is flat and substantially parallel to the XY plane. The lens 131 is joined by an adhesive member 113 disposed between the inner surface of the lens 131 and the substrate 110. Note that the lens 131 and the substrate 110 may not be joined. For example, only the substrate 110 may be rotated.

[0046] In the example shown in FIG. 1, in a top view, the plurality of light sources 120 and the light receiving elements 200 are arranged such that the distances between their respective centers and the central axis D1 of the substrate 110 are substantially equal. In the example shown in FIG. 2, a part of the emitted light L1, which is the emitted light from the light source 120, passes through the lens 131, passes through the focal point F, and then propagates away from the rotation axis D2 as it travels in the +Z direction. Further, the incident light L2 from outside the light emitting module 100 to the lens 131 is incident on the light receiving element 200 after passing through the lens 131.

[0047] In FIG. 2, for the sake of clarity, a part of the light emitted from one of the plurality of light sources 120 is shown as emitted light L1. However, although the emitted light from each of the plurality of light sources 120 is emitted in different directions according to the positions where the plurality of light sources 120 are respectively arranged, in that a part of the emitted light passes through the lens 131 and, after passing through the focal point F, propagates away from the rotation axis D2 as it goes in the +Z direction, it behaves in the same manner as the emitted light L1 shown in FIG. 2. Therefore, the emitted light L1 shown in FIG. 2 can be regarded as the emitted light from each of the plurality of light sources 120. This also holds true for FIGS. 6 and 7 shown hereinafter.

[0048] In the example shown in FIG. 2, a support portion 132 extending downward from the outer peripheral portion of the lens 131 is provided on the outer peripheral portion of the lens 131. The support portion 132 is integrally formed with the lens 131. The support portion 132 has a cylindrical shape surrounding the plurality of light sources 120 in a top view. However, the shape of the support portion 132 is not limited to a cylindrical shape. For example, a plurality of columnar support portions may be arranged on the outer periphery of the lens 131. Also, the support portion 132 may be made of a material different from that of the lens 131. In this case, the support portion 132 does not necessarily have to have light transmissivity.

[0049] (Drive unit 140 and control unit 150) The control unit 150 can control the emission of light from the plurality of light sources 120 and output the biological light reception information DL output from the light receiving element 200 to the processor 210. Further, in the light emitting module 100, the control unit 150 can control the rotation of the substrate via the drive unit 140. In the example shown in FIG. 2, the drive unit 140 includes a motor 141 and a shaft 142 that is connected to the substrate 110 and interlocks with the motor 141. When the motor 141 is driven, the shaft 142 rotates. As the shaft 142 rotates, the substrate 110 rotates around the rotation axis D2. As described above, in the light emitting module 100, the rotation axis D2 generally coincides with each of the central axis D1 of the substrate 110 and the optical axis D3 of the lens 131. Note that the processor 210 and the control unit 150 may be integrated as one component. Also, the control unit 150 may have some functions of the processor 210, and the processor 210 may have some functions of the control unit 150.

[0050] A rotary connection connector 170 is provided on the shaft 142. The rotary connection connector 170 includes a ring unit 171 and a brush unit 172. The rotary connection connector 170 electrically connects the plurality of wirings 112 of the rotating substrate 110 and the control unit 150. In the example shown in FIG. 2, the rotary connection connector 170 is a slip ring. However, the rotary connection connector 170 may be a rotary connector using liquid metal or the like.

[0051] The ring unit 171 has a cylindrical body 171a in which the shaft 142 is disposed and that is connected to the shaft 142, and a plurality of conductive rings 171b provided on the outer periphery of the cylindrical body 171a. The ring unit 171 rotates together with the shaft 142. The plurality of rings 171b and the plurality of wirings 112 built in the substrate 110 are electrically connected in pairs through the inside of the shaft 142 and the inside of the cylindrical body 171a.

[0052] The brush unit 172 includes a plurality of conductive brushes 172a that contact the plurality of rings 171b in pairs, and a holder 172b that holds the plurality of brushes 172a. The control unit 150 is electrically connected to the motor 141 of the drive unit 140 and each brush 172a of the rotary connection connector 170.

[0053] <Operation of the light-emitting module according to the first embodiment> Next, with reference to FIGS. 6 and 7, the operation of the light-emitting module 100 will be described. FIG. 6 is a schematic cross-sectional view of the light-emitting module 100 showing an example of the irradiation operation of white light by the light-emitting module 100. FIG. 7 is a schematic cross-sectional view of the light-emitting module 100 showing an example of the irradiation operation of light when the biological light reception information DL is output by the light-emitting module 100. Note that the cross-sectional views of FIGS. 6 and 7 show the cross-section corresponding to the line II-II in FIG. 1.

[0054] The light-emitting module 100 can rotate the substrate 110 by controlling the drive unit 140 by the control unit 150. The rotation speed of the substrate 110 is, for example, 60 rpm (revolutions per minute) or more and 24000 rpm or less. The control unit 150 may be configured to be able to adjust the rotation speed of the motor 141 of the drive unit 140.

[0055] Also, as described above, the light-emitting module 100 can switch between the emission of white light and the emission of light when outputting the biological light reception information DL by the control unit 150. The control unit 150 performs the above switching, for example, in response to an operation input by an operator to the light-emitting module 100.

[0056] When the light-emitting module 100 uses the light irradiated from the light-emitting module 100 for imaging by the imaging device, the control unit 150 sets it to a state where white light can be irradiated as shown in FIG. 6. In the example shown in FIG. 6, it shows a state where the emitted light L3 spreading from the light source 120 passes through the lens 131, is focused at the focal point F, and then irradiates the irradiated surface P1. The irradiated surface P1 is a virtual surface orthogonal to the rotation axis D2 and located in the +Z direction of the lens 131.

[0057] In the state shown in FIG. 6, the light emitting module 100 emits the red emitted light L3 from the red light source 120r, the green emitted light L3 from the green light source 120g, and the blue emitted light L3 from the blue light source 120b in parallel. The emitted light L3 of each color is emitted from different positions on the substrate 110 in different directions, passes through the lens 131, is focused at the focal point F, and then is irradiated onto the irradiated surface P1. By mixing the red emitted light L3, the green emitted light L3, and the blue emitted light L3, a mixed color light is obtained. The light emitting module 100 can irradiate the irradiated surface P1 with white light composed of the mixed color light of the emitted light L3 of each color. The region A1 shown in FIG. 6 represents the region irradiated with white light. The region A1 is a substantially circular region centered on the rotation axis D2 on the irradiated surface P1 when viewed from below the irradiated surface P1. Further, when the substrate 110 is rotated around the rotation axis D2 by the driving unit 140, the white light irradiated on the region A1 rotates around the rotation axis D2.

[0058] When the light emitting module 100 irradiates white light, the light receiving element 200 may be used to acquire information regarding the amount of light of the light around the light emitting module. In the example shown in FIG. 6, the light emitting module 100 receives the incident light L4 from outside the light emitting module 100 by the light receiving element 200, and outputs information regarding the incident light L4 to the control unit 150. The control unit 150 can adjust the amount of the irradiation light according to the information regarding the amount of the incident light L4 input from the light receiving element 200. For example, in an imaging device that performs imaging using the irradiation light from the light emitting module 100 as flash light, imaging adapted to the brightness around the imaging device can be performed.

[0059] Further, when the light emission module 100 outputs the biological light reception information DL based on the light irradiated from the light emission module 100, as shown in FIG. 7, the control unit 150 sets at least one of the plurality of light sources 120 to a state where light can be irradiated. In the example shown in FIG. 7, it shows a state where the emitted light L5 emitted from at least one of the plurality of light sources 120 passes through the lens 131, is focused at the focal point F, and then irradiates the irradiated surface P2. The irradiated surface P2 is a virtual surface orthogonal to the rotation axis D2 and located in the +Z direction of the lens 131, and is a surface on which a part of the living body from which the biological information Db is obtained is arranged. The light emission module 100 can receive at least one of the reflected light and the scattered light of the emitted light L5 irradiated from the light emission module 100 by the light receiving element 200 and output the biological light reception information DL. In the example shown in FIG. 7, a part of at least one of the reflected light and the scattered light by the living body is shown as the incident light L6 with an arrow. Note that, for the sake of simplicity of explanation, the change in the traveling direction due to the refractive index difference between each member is omitted in the illustration of the arrow L4 in FIG. 6 and the arrow L6 in FIG. 7.

[0060] When acquiring the biological information Db, it is preferable that the light receiving element 200 receives at least one of the reflected light and the scattered light of the light irradiated from the light emission module 100 with as much light quantity as possible. Therefore, the irradiated surface P2 is preferably located closer to the light emission module 100 compared to the above-described irradiated surface P1. The surface of the living body may be arranged so as to contact the light emission surface 131b. When the surface of the living body is arranged so as to contact the light emission surface 131b, the irradiated surface P2 may substantially coincide with the light emission surface 131b.

[0061] The light-emitting module 100 can emit at least one of red emission light L5 from the red light source 120r, green emission light L5 from the green light source 120g, blue emission light L5 from the blue light source 120b, and infrared emission light L5 from the infrared light source 120i. When the light-emitting module 100 emits two or more emission lights L5, these can be emitted in parallel. At least one of the emission lights L5 of each color and infrared is emitted from different positions on the substrate 110 in different directions, passes through the focal point F, converges at the focal point F, and then is irradiated onto the irradiated surface P2. Further, when the substrate 110 rotates around the rotation axis D2 by the driving unit 140, the light irradiated onto the irradiated surface P2 rotates around the rotation axis D2.

[0062] At least one of the emission lights L5 of each color and infrared irradiated onto the irradiated surface P2 is reflected and scattered by a part of the living body disposed on the irradiated surface P2. The light receiving element 200 can receive the incident light L6, which is at least one of the reflected light and the scattered light, and output biological light receiving information DL.

[0063] <Modification Example> Hereinafter, various modification examples of the light-emitting module 100 will be described. Note that the same names and reference numerals as those in the already described embodiments and modification examples indicate the same or similar members or components, and the detailed description will be omitted as appropriate. This also applies to other embodiments shown hereinafter.

[0064] (First Modification Example) With reference to FIGS. 8A, 8B, 9, and 10, the light-emitting module 100 according to the first modification example will be described. FIG. 8A is a schematic cross-sectional view showing an example of the configuration of the red light source 120r including the first phosphor 124r of the light-emitting module 100 according to the first modification example. FIG. 8B is a schematic cross-sectional view showing an example of the configuration of the green light source 120g including the second phosphor 124g of the light-emitting module 100 according to the first modification example. FIG. 9 is a diagram showing an example of the emission spectrum of the red light source including the first phosphor 124r. FIG. 10 is a diagram showing an example of the emission spectrum of the green light source including the second phosphor 124g.

[0065] In this modification example, the red light source 120r includes a first light-emitting element 121r that emits blue light, and a first phosphor 124r that wavelength-converts at least a part of the blue light emitted from the first light-emitting element 121r and emits red light. The green light source 120g includes a second light-emitting element 121g that emits blue light, and a second phosphor 124g that wavelength-converts at least a part of the blue light emitted from the second light-emitting element 121g and emits green light. The above points are mainly different from those of the first embodiment described above.

[0066] In the example shown in FIG. 8A, the red light source 120r has a first light-emitting element 121r and a first phosphor 124r disposed on the upper surface of the first light-emitting element 121r. The first phosphor 124r wavelength-converts at least a part of the light emitted from the first light-emitting element 121r. As the material of the first light-emitting element 121r, a nitride semiconductor capable of emitting blue light can be used. The nitride semiconductor is mainly represented by the general formula In x Al y Ga 1-x-y N (0 ≦ x, 0 ≦ y, x + y ≦ 1). From the viewpoints of luminous efficiency and the mixing color relationship between the excitation of the wavelength-converting substance and its light emission, the emission peak wavelength of the first light-emitting element 121r is preferably 400 nm or more and 530 nm or less, more preferably 420 nm or more and 490 nm or less, and even more preferably 450 nm or more and 475 nm or less. Thereby, the first phosphor contained in the first phosphor 124r can be efficiently excited. As the first phosphor, a phosphor that is excited by the blue light emitted by the first light-emitting element 121r and emits red light can be used.

[0067] In the example shown in FIG. 8B, the green light source 120g has a second light-emitting element 121g and a second phosphor 124g disposed on the upper surface of the second light-emitting element 121g. The second phosphor 124g wavelength-converts at least a part of the light emitted from the second light-emitting element 121g. As the material of the second light-emitting element 121g, the same material as that of the first light-emitting element 121r can be used. As the second phosphor, a phosphor that is excited by the blue light emitted by the second light-emitting element 121g and emits green light can be used.

[0068] The first phosphor 124r and the second phosphor 124g may be a translucent member such as a resin containing a phosphor, or may be a sintered body of the phosphor.

[0069] Examples of phosphors that emit visible light and can be used in the light-emitting modules of the present embodiment and modified examples include, for example, yttrium aluminum garnet-based phosphors (e.g., Y 3 (Al,Ga) 5 O 12 :Ce), lutetium aluminum garnet-based phosphors (e.g., Lu3(Al,Ga)5O12:Ce), terbium aluminum garnet-based phosphors (e.g., Tb 3 (Al,Ga) 5 O 12 :Ce), CCA-based phosphors (e.g., Ca 10 (PO 4 ) 6 Cl 2 :Eu), SAE-based phosphors (e.g., Sr 4 Al 14 O 25 :Eu), chlorosilicate-based phosphors (e.g., Ca 8 MgSi 4 O 16 Cl 2 :Eu), β-sialon-based phosphors (e.g., (Si,Al) 3 (O,N) 4 :Eu) or α-sialon-based phosphors (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu) and other oxynitride-based phosphors, SLA-based phosphors (e.g., SrLiAl 3 N 4 :Eu), CASN-based phosphors (e.g., CaAlSiN 3 :Eu) or SCASN-based phosphors (e.g., (Sr,Ca)AlSiN 3 :Eu) and other nitride-based phosphors, KSF-based phosphors (e.g., K 2 SiF 6 :Mn), KSAF-based phosphors (e.g., K 2 Si 0.99 Al 0.01 F 5.99 :Mn) or MGF-based phosphors (e.g., 3.5MgO·0.5MgF2 ·GeO 2 :Mn) and other fluoride phosphors, phosphors having a perovskite structure (for example, CsPb(F,Cl,Br,I) 3 ), or quantum dot phosphors (for example, CdSe, InP, AgInS 2 or AgInSe 2 ) and the like can be used. The KSAF-based phosphor may have a composition represented by the following formula (I). M 2 [Si p Al q Mn r F s (I)

[0070] In formula (I), M represents an alkali metal and may contain at least K. Mn may be tetravalent Mn ions. p, q, r, and s may satisfy 0.9 ≦ p + q + r ≦ 1.1, 0 < q ≦ 0.1, 0 < r ≦ 0.2, 5.9 ≦ s ≦ 6.1. Preferably, 0.95 ≦ p + q + r ≦ 1.05 or 0.97 ≦ p + q + r ≦ 1.03, 0 < q ≦ 0.03, 0.002 ≦ q ≦ 0.02 or 0.003 ≦ q ≦ 0.015, 0.005 ≦ r ≦ 0.15, 0.01 ≦ r ≦ 0.12 or 0.015 ≦ r ≦ 0.1, 5.92 ≦ s ≦ 6.05 or 5.95 ≦ s ≦ 6.025. For example, K 2 [Si 0.946 Al 0.005 Mn 0.049 F 5.995 , K 2 [Si 0.942 Al 0.008 Mn 0.050 F 5.992 , K 2 [Si 0.939 Al 0.014 Mn 0.047 F 5.986 are exemplified. According to such a KSAF-based phosphor, high luminance and narrow half-value width of the emission peak wavelength can be obtained for red emission.

[0071] For example, as described above with reference to FIGS. 3 to 4, when a semiconductor element that emits red light is used as the red light source and a semiconductor element that emits green light is used as the green light source, the wavelength range of the light emitted from each of the red light source and the green light source is narrow. As a result, in the wavelength range of orange, which is between red and green, a wavelength range with a small amount of light may occur, and it may not be possible to obtain reflected light that accurately reflects the color of the object. If reflected light that accurately reflects the color of the object cannot be obtained, the color of the object cannot be accurately represented in an image taken using the light emitted from the light emitting module.

[0072] In this modified example, as shown in FIG. 9, the emission spectrum of the red light source 120r has a wider wavelength range compared to the red light relative light amount distribution 31 shown in FIG. 3, which is emitted by the red light source 120r included in the light emitting module 100 according to the first embodiment. Further, as shown in FIG. 10, the emission spectrum of the green light source 120g has a wider wavelength range compared to the green light relative light amount distribution 32 shown in FIG. 3, which is emitted by the green light source 120g included in the light emitting module 100 according to the first embodiment. As a result, the light emitting module 100 according to the first modified example reduces the light amount shortage in the boundary wavelength range 34 between the red light relative light amount distribution 31 and the green light relative light amount distribution 32 as shown in FIG. 3, and can obtain reflected light that accurately reflects the color of the object. As a result, in this modified example, the color of the object can be accurately represented in an image taken using the irradiation light from the light emitting module 100.

[0073] (Second Modified Example) Next, with reference to FIG. 11, the light emitting module according to the second modified example will be described. FIG. 11 is a schematic top view showing a substrate 110 on which a light source 120 in the light emitting module according to the second modified example is arranged.

[0074] In this modified example, at least one light receiving element 200 has a plurality of light receiving portions with different spectral responsivities. The main difference from the first embodiment is that the plurality of light receiving portions can further output light receiving information regarding ambient light (that is, the light around the light emitting module).

[0075] In the example shown in FIG. 11, the light receiving element 200 has a first light receiving portion 200a and a second light receiving portion 200b as a plurality of light emitting portions. The spectral responsivity of the first light receiving portion 200a is different from the spectral responsivity of the second light receiving portion 200b. Each of the first light receiving portion 200a and the second light receiving portion 200b outputs light reception information regarding ambient light to an external device such as an imaging device that performs imaging using the light irradiated from the light emitting module via the control unit 150 shown in FIG. 2. The external device can acquire information regarding ambient light based on the light reception information received from each of the first light receiving portion 200a and the second light receiving portion 200b. Note that the information regarding the ambient light received by the light receiving element 200 may be acquired by the control unit 150 and passed from the control unit 150 to the external device.

[0076] The substrate 110 shown in FIG. 11 includes a first virtual circle C1 located inside and a second virtual circle C2 located outside in a top view. Note that the first virtual circle C1 and the second virtual circle C2 are virtual circles centered on the central axis D1, respectively. On the first virtual circle C1, two red light sources 120r located with the central axis D1 interposed therebetween, two green light sources 120g located with the central axis D1 interposed therebetween, one blue light source 120b, one infrared light source 120i, one white light source 120w1, and the second light receiving portion 200b are arranged. On the second virtual circle C2, two red light sources 120r located with the central axis D1 interposed therebetween, two green light sources 120g located with the central axis D1 interposed therebetween, one blue light source 120b, one infrared light source 120i, one white light source 120w1, and the first light receiving portion 200a are arranged.

[0077] For example, when performing imaging with an imaging device using the light irradiated from the light emitting module, it is preferable that the imaging device varies the white balance or the color temperature of the light irradiated from the light emitting module depending on whether the location where the imaging is performed is indoors or outdoors. The imaging device can perform imaging that accurately represents the color of the object by controlling the white balance or the color temperature of the irradiated light according to whether the location where the imaging is performed is indoors or outdoors.

[0078] The imaging device that uses the irradiation light from the light-emitting module according to this modification example acquires the ratio information of the infrared light included in the ambient light based on the ambient light reception information received from the first light-receiving unit 200a and the second light-receiving unit 200b. Since the ratio of the infrared light included in the ambient light is different between indoors and outdoors, the imaging device can determine whether the location where the light-emitting module and the imaging device are located during imaging is outdoors or indoors based on the ratio information of the infrared light included in the ambient light. Specifically, when the ratio of the infrared light included in the ambient light is equal to or higher than a predetermined threshold value, the imaging device determines that the location where the light-emitting module and the imaging device are located during imaging is outdoors. On the other hand, when the ratio of the infrared light included in the ambient light is less than the predetermined threshold value, the imaging device determines that the location where the light-emitting module and the imaging device are currently located is indoors. The imaging device can perform imaging that accurately represents the color of the object by controlling the white balance or the color temperature of the irradiation light or the like according to the determination result.

[0079] The ambient light reception information is not limited to the ratio information of the infrared light included in the ambient light, and may be information regarding the light amounts of various wavelengths, information regarding the light amount distributions of a plurality of wavelengths, or the like. Further, the control by the external device that has received the ambient light reception information is not limited to the control according to whether the location where the light-emitting module and the external device are located during imaging is indoors or outdoors. For example, the external device that has received the ambient light reception information can also determine whether the lighting fixture that illuminates the periphery of the light-emitting module and the external device is an incandescent lamp, a fluorescent lamp, an LED illumination, or the like, and control the color temperature of the irradiation light or the like.

[0080] The spectral responsivities in the plurality of light-receiving units may be made different by making the materials or the like that constitute each light-receiving unit different, or may be made different by arranging optical elements having mutually different spectral characteristics on each light-receiving unit.

[0081] Further, in the light-emitting module according to this modification example, when acquiring the biological information Db, the biological light reception information DL output from at least one of the first light-receiving unit 200a and the second light-receiving unit 200b can be used.

[0082] (Third Modification Example) Next, with reference to FIG. 12, a light-emitting module according to a third modification will be described. FIG. 12 is a schematic top view showing a substrate 110 on which a plurality of light sources according to the third modification are arranged.

[0083] In this modification, the plurality of light sources have a plurality of light source units 125U arranged on lattice points side by side in the X direction and the Y direction on the substrate 110. Each of the plurality of light source units 125U includes a red light source 120r, a green light source 120g, a blue light source 120b, an infrared light source 120i, a white light source 120w1, and a light receiving element 200. The red light source 120r, the green light source 120g, the blue light source 120b, the infrared light source 120i, the white light source 120w1, and the light receiving element 200 are arranged on lattice points side by side in the X direction and the Y direction on the substrate 110. The above points are mainly different from the first embodiment.

[0084] Also in this modification, it is possible to provide a light-emitting module that can irradiate white light and output bioluminescence reception information used for acquiring biological information. Note that the plurality of light sources may include at least one light source unit 125U. The plurality of light source units 125U do not necessarily have to be arranged on lattice points side by side in the X direction and the Y direction, and may be arranged at arbitrary positions in the X direction and the Y direction. Further, in the light source unit 125U, the red light source 120r, the green light source 120g, the blue light source 120b, the infrared light source 120i, the white light source 120w1, and the light receiving element 200 are not limited to a configuration in which there is one of each. A configuration in which there are two or more of each may be used, or a configuration in which the number of at least one of the light sources of each color and infrared, and the light receiving element is different may be used.

[0085] [Second Embodiment] Next, with reference to FIGS. 13 to 15, the light-emitting module according to the second embodiment will be described. FIG. 13 is a schematic top view showing an example of the light-emitting module 100A according to the second embodiment. FIG. 14 is a schematic cross-sectional view showing an example of the XIV-XIV line in FIG. 13. FIG. 15 is a schematic cross-sectional view showing an example of the configuration of the infrared light source 120i including the third phosphor 124i of the light-emitting module 100A. In FIG. 14, a part of the light emitted from the white light source 120w2 included in the light-emitting module 100A is indicated by an arrow as the emitted light L8, and a part of the light incident on the light-emitting module 100A from the outside of the light-emitting module 100A is indicated by an arrow as the incident light L7. Note that, in the incident light L7 and the emitted light L8 in FIG. 14, the change in the traveling direction due to the difference in refractive index between the members is omitted from the illustration.

[0086] In the present embodiment, at least one light source 120 is a white light source 120w2 that emits white light. The white light source 120w2 includes a light-emitting element 121 that emits blue light, and a wavelength conversion member 125 disposed on the light-emitting element 121. The wavelength conversion member 125 includes a first phosphor 124r that wavelength-converts at least a part of the blue light emitted from the light-emitting element 121 to emit red light, a second phosphor 124g that wavelength-converts at least a part of the blue light emitted from the light-emitting element 121 to emit green light, and a third phosphor 124i that wavelength-converts at least a part of the blue light emitted from the light-emitting element 121 to emit infrared light.

[0087] In the present embodiment, at least one light-receiving element 200 includes a first light-receiving portion 200a, a second light-receiving portion 200b, and a third light-receiving portion 200c having different spectral responsivities. The first light-receiving portion 200a has a light-receiving sensitivity in the red region. The second light-receiving portion 200b has a light-receiving sensitivity in the green region. The third light-receiving portion 200c has a light-receiving sensitivity in the infrared region. The first light-receiving portion 200a, the second light-receiving portion 200b, and the third light-receiving portion 200c are an example of a plurality of light-receiving portions having different spectral responsivities. The above points are mainly different from the first embodiment.

[0088] In the example shown in FIG. 13, one white light source 120w2 is disposed on the substrate 110. In the example shown in FIG. 14, the white light source 120w2 includes a light emitting element 121, a wavelength conversion member 125 disposed on the light emitting element 121, and a light shielding member 126 that covers side surfaces of the light emitting element 121 and the wavelength conversion member 125, respectively.

[0089] The light emitting module 100A can irradiate the irradiated surface P with a red light component, a green light component, a blue light component, and an infrared light component included in the white light emitted from the white light source 120w2. The emitted light L8 can pass through the lens 131, be focused at the focal point F, and then irradiate the irradiated surface P.

[0090] When performing imaging with the imaging device using the light irradiated from the light emitting module 100, the light emitting module 100A can irradiate white light emitted from the white light source 120w2. On the other hand, when outputting the biological light reception information DL, the light emitting module 100A can output the biological light reception information obtained by receiving at least one of the reflected light and the scattered light of the emitted light L from the white light source 120w2 by the biological body by the first light receiving unit 200a, the second light receiving unit 200b, and the third light receiving unit 200c, respectively.

[0091] As described above, the light emitting module 100A can emit white light composed of the emitted light L8. Further, the processor 210 or the external device that receives the biological light reception information DL output from the light emitting module 100 can acquire biological information Db regarding the biological body based on the biological light reception information DL. As described above, in the present embodiment, it is possible to provide the light emitting module 100A that can irradiate white light and can output the biological light reception information DL used for acquiring the biological information Db.

[0092] In addition, in this embodiment, the light-emitting module 100A has the white light source 120w2, and can output the biological light-receiving information DL obtained by receiving at least one of the reflected light and the scattered light of the light of each color and infrared light irradiated in parallel by the living body. As a result, since it is not necessary to irradiate the light of each color and infrared light sequentially, the light-emitting module 100A can efficiently output the biological light-receiving information DL.

[0093] In addition, in the light-emitting module 100A illustrated in FIG. 13, at least one light-receiving element 200 includes a plurality of light-receiving portions having different spectral responsivities. The plurality of light-receiving portions include a first light-receiving portion 200a, a second light-receiving portion 200b, and a third light-receiving portion 200c. In the example shown in FIG. 13, the set of the first light-receiving portion 200a, the second light-receiving portion 200b, and the third light-receiving portion 200c arranged in the Y direction is disposed on the -X side of one white light source 120w2.

[0094] Each of the first light-receiving portion 200a, the second light-receiving portion 200b, and the third light-receiving portion 200c outputs the biological light-receiving information DL to the processor 210 via the control unit 150. The processor 210 receives, as the biological light-receiving information DL, information regarding the light for each wavelength in the light received by the light-receiving element 200 from the first light-receiving portion 200a, the second light-receiving portion 200b, and the third light-receiving portion 200c. The processor 210 can obtain the biological information Db by calculation based on the received biological light-receiving information DL. For example, the processor 210 can obtain pulse information from the biological light-receiving information DL regarding at least green light, and obtain blood oxygen concentration information from the biological light-receiving information DL regarding red light and infrared light.

[0095] As described above, based on the biological light-receiving information DL obtained by the light-emitting module 100A receiving at least one of the reflected light and the scattered light of the light of each color and infrared light irradiated, the processor 210 can obtain the biological information Db. As a result, since it is not necessary to irradiate the light of each color and infrared light sequentially, the biological information Db can be efficiently obtained. From the viewpoint of improving the acquisition accuracy of the biological information Db, the white light source 120w2 preferably emits white light with little difference in the amount of light for each wavelength.

[0096] (White light source 120w2) As shown in FIG. 15, the wavelength conversion member 125 includes a first phosphor 124r that wavelength-converts at least a part of the light emitted from the light-emitting element 121 to emit red light, a second phosphor 124g that wavelength-converts at least a part of the blue light emitted from the light-emitting element 121 to emit green light, and a third phosphor 124i that wavelength-converts at least a part of the light emitted from the light-emitting element 121 to emit infrared light.

[0097] As the first phosphor 124r, among the above-described phosphors, a phosphor that is excited by the blue light emitted from the light-emitting element 121 and emits red light can be used. As the second phosphor 124g, among the above-described phosphors, a phosphor that is excited by the blue light emitted from the light-emitting element 121 and emits green light can be used. As the third phosphor 124i, a phosphor that is excited by the blue light emitted from the light-emitting element 121 and emits infrared light can be used.

[0098] As the phosphor that emits infrared light, considering the light absorption rate difference between oxyhemoglobin and reduced hemoglobin and the light reception sensitivity of the light receiving element, it is preferable to use an infrared phosphor having an emission peak wavelength in the wavelength range of 800 nm or more and 1000 nm. Examples of the infrared phosphor include, as an oxide phosphor, a phosphor having a composition included in the following compositional formula (1). (Mg 1-t M 1 t ) u (Ga 1-v-x-y M 2 v ) 2 O w :Cr x ,M 3 y (II) (In the above formula (1), t, u, v, w, x, and y satisfy 0 ≦ t ≦ 0.8, 0.7 ≦ u ≦ 1.3, 0 ≦ v ≦ 0.8, 3.7 ≦ w ≦ 4.3, 0.02 ≦ x ≦ 0.3, 0 ≦ y ≦ 0.2, and y < x.)

[0099] The oxide phosphor is the first element M1 preferably contains at least one element selected from the group consisting of Ca, Sr, Ni, and Zn, and the second element M 2 preferably contains at least one element selected from the group consisting of Al and Sc, and the third element M 3 preferably contains at least one element selected from the group consisting of Eu, Ce, Ni, and Mn.

[0100] These are an example of a phosphor that emits infrared light, and known infrared phosphors other than the above-described phosphors may also be used.

[0101] The light-shielding member 126 includes, for example, a translucent base material such as resin and a light diffusing material, and the light diffusing material diffusely reflects the light emitted from the light-emitting element 121 and the wavelength conversion member 125. Thereby, it is possible to reduce the emission of light that does not propagate through the wavelength conversion member 125 from the side surface of the light-emitting element 121. As a result, color unevenness of the light emitted from the white light source 120w2 can be reduced. As the resin material included in the light-shielding member 126, a silicone resin, an epoxy resin, a phenolic resin, a polycarbonate resin, an acrylic resin, or a modified resin thereof can be used. As the light diffusing material included in the light-shielding member 126, titanium oxide, magnesium oxide, or the like can be used.

[0102] [Third Embodiment] Next, with reference to FIGS. 16 to 18, a smartphone according to the third embodiment will be described. FIG. 16 is a schematic view of the smartphone 1000 according to the third embodiment viewed from the side opposite to the display surface 501 side. FIG. 17 is a schematic view of the smartphone 1000 viewed from the display surface 501 side. FIG. 18 is a schematic cross-sectional view taken along line XVIII-XVIII in FIG. 16. Note that the display surface 501 side corresponds to the +Z side.

[0103] In the example shown in FIGS. 16 and 17, the smartphone 1000 includes a light-emitting module 100, an imaging device 300, a housing 191, a front camera 400, and a display unit 500 including a display surface 501. The imaging device 300 includes an imaging device 300-1 and an imaging device 300-2. The light-emitting module 100 and the imaging device 300 are arranged such that a part thereof is exposed from the housing 191 of the smartphone 1000 to the +Z side. The front camera 400 and the display unit 500 are arranged such that a part thereof is exposed from the housing 191 of the smartphone 1000 to the -Z side.

[0104] The light emitted from the light-emitting module 100 is used to irradiate a subject in shooting by the imaging device 300-1 and the imaging device 300-2. Note that the smartphone 1000 may have at least one of the light-emitting module 100 and the light-emitting module 100A.

[0105] In addition, the light emitted from the light-emitting module is used to output biometric reception information obtained by receiving at least one of reflected light and scattered light by a living body. Specifically, a part of a living body (for example, a peripheral part such as a human finger) is brought into contact with the irradiation surface of the light-emitting module 100 exposed from the housing 191 of the smartphone 1000 to irradiate light, and biometric reception information can be output by receiving at least one of reflected light and scattered light by the living body.

[0106] By having the light-emitting module 100, the smartphone 1000 can irradiate white light and can acquire biometric information Db based on biometric reception information DL output from the light-emitting module 100.

[0107] The imaging device 300 includes a camera for taking still images, a video camera for taking videos, and the like. The specifications of the imaging device 300-1 and the imaging device 300-2 may be the same as each other or may be different from each other. For example, in the imaging device 300-1 and the imaging device 300-2, specifications such as the shooting resolution or the shooting angle of view may be different from each other. Also, the imaging device 300 may include three or more imaging devices or may include two or fewer imaging devices. The arrangement of the imaging device 300 and the light-emitting module 100 can also be appropriately changed according to the specifications required for the smartphone 1000.

[0108] The housing 191 is a box-shaped member that houses the light-emitting module 100, the imaging device 300, the front camera 400, the display unit 500, and their control boards and the like inside. As the material constituting the housing 191, a resin material, a metal material, or the like can be used. Also, the size, shape, etc. of the housing 191 can be appropriately changed according to the specifications required for the smartphone 1000.

[0109] The front camera 400 is an imaging device for an operator of the smartphone to take a picture of himself / herself or a plurality of persons including himself / herself. The front camera 400 can also be referred to as an imaging device for selfies. The front camera 400 is used in applications such as video calls, video shooting, and personal authentication using the smartphone 1000.

[0110] The display unit 500 displays various images on the display surface 501, such as operation images for operating the smartphone 1000, images displayed by executing an application program, and captured images by the imaging device 300. Note that the application program is a program installed in the smartphone or an external server communicably connected to the smartphone. The display unit 500 is configured by an organic EL (Electro Luminescence) or a liquid crystal panel or the like. The display unit 500 in the smartphone 1000 has a touch panel function on the display surface 501. The shooting button 502 in FIG. 17 is a UI (User Interface) displayed on the display surface 501. At least one of the imaging device 300 and the front camera 400 can perform shooting in response to a touch operation on the shooting button 502 by the operator of the smartphone 1000.

[0111] In the example shown in FIG. 18, an opening 191a is provided in the housing 191 of the smartphone 1000. The lens 131 is disposed in the opening 191a. The support portion 132 is fixed to a component 192 of the smartphone 1000 disposed in the housing 191 of the smartphone 1000. A close contact member 193 that closely contacts the support portion 132 and the housing 191 is provided between the support portion 132 and the housing 191. For the close contact member 193, an elastic material such as natural rubber or synthetic rubber can be used, for example. The shape of the close contact member 193 in a top view is annular. The close contact member 193 can reduce the intrusion of dust and liquid from the gap between the lens 131 and the housing 191. However, the position of the close contact member 193 is not limited to the above as long as it can reduce the intrusion of dust and liquid from the gap between the lens 131 and the housing 191. For example, the close contact member 193 may be provided in the gap between the housing 191 and a portion of the lens 131 other than the support portion 132. Further, the support portion 132 may not be provided on the lens 131, and the lens 131 itself may be fixed to the housing 191.

[0112] The control unit 150 and the brush unit 172 are fixed to the component 192 of the smartphone 1000. Therefore, when the motor 141 is driven, the control unit 150 and the brush unit 172 can transmit an electrical signal to the ring unit 171 without rotating.

[0113] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope described in the claims.

[0114] The ordinal numbers, quantities, and other numbers used in the description of the embodiments are all exemplified for specifically explaining the technology of the present disclosure, and the present disclosure is not limited to the exemplified numbers. In addition, the connection relationship between components is exemplified for specifically explaining the technology of the present disclosure, and the connection relationship for realizing the functions of the present disclosure is not limited thereto.

[0115] The light-emitting module and the smartphone of the present disclosure can irradiate white light and output bioreception information used for acquiring biological information, and thus can be suitably used for lighting, the flash of a camera, vital checks of a living body, and the like. However, the light-emitting module and the smartphone of the present disclosure are not limited to these applications. Note that the device including the light-emitting module of the present disclosure is not limited to a smartphone, and can be suitably used for mobile devices such as smartwatches, notebook PCs, and tablet terminals.

[0116] Aspects of the present disclosure are, for example, as follows. <Item 1> A light-emitting module having a substrate, at least one light source disposed on the substrate, at least one light-receiving element disposed on the substrate, and a lens disposed opposite to the light source and the light-receiving element, wherein the at least one light source can emit white light composed of a mixed color light of red light, green light, and blue light, and the at least one light-receiving element outputs biological light-receiving information obtained by receiving at least one of reflected light and scattered light of the light emitted from the at least one light source by a living body. <Item 2> The at least one light source includes a plurality of light sources, the plurality of light sources including a red light source that emits red light, a green light source that emits green light, a blue light source that emits blue light, and an infrared light source that emits infrared light, and the at least one light-receiving element outputs biological light-receiving information obtained by receiving at least one of reflected light and scattered light of the light emitted from the plurality of light sources by a living body, which is the light-emitting module according to <Item 1>. <Item 3> The plurality of light sources further includes a white light source that emits white light, which is the light-emitting module according to <Item 2>. <Item 4> The red light source includes a first light-emitting element that emits blue light and a first phosphor that wavelength-converts at least a part of the blue light emitted from the first light-emitting element to emit red light, and the green light source includes a second light-emitting element that emits blue light and a second phosphor that wavelength-converts at least a part of the blue light emitted from the second light-emitting element to emit green light, which is the light-emitting module according to <Item 2> or <Item 3>. <Item 5> The light-emitting module according to any one of <Items 2> to <Item 4> further having a processor capable of outputting biological information regarding the living body based on the biological light-receiving information output from the light-receiving element. <Item 6> The plurality of light sources are arranged in a circular ring shape, which is the light-emitting module according to any one of <Items 2> to <Item 5>. <Item 7> The light-emitting module according to <Item 6>, having a driving unit capable of rotating the substrate with the central axis of the circular ring as the rotation axis. <Item 8> The light emission module according to <Item 7>, wherein the rotation axis of the substrate by the drive unit coincides with the optical axis of the lens. <Item 9> The light emission module according to any one of <Items 2> to <Item 8>, having a control unit capable of controlling the emission of light from the plurality of light sources. <Item 10> The light emission module according to any one of <Items 2> to <Item 9>, wherein the at least one light receiving element has a plurality of light receiving portions with different spectral responsivities, and the plurality of light receiving portions are further capable of outputting light receiving information regarding ambient light. <Item 11> The at least one light source is a white light source that emits white light, and the white light source includes a light emitting element that emits blue light and a wavelength conversion member disposed on the light emitting element. The wavelength conversion member includes a first phosphor that wavelength-converts at least a part of the blue light emitted from the light emitting element to emit red light, a second phosphor that wavelength-converts at least a part of the blue light emitted from the light emitting element to emit green light, and a third phosphor that wavelength-converts at least a part of the blue light emitted from the light emitting element to emit infrared light. The light emission module according to <Item 1>. <Item 12> The light emission module according to <Item 11>, wherein the at least one light receiving element includes a plurality of light receiving portions with different spectral responsivities. <Item 13> A smartphone including the light emission module according to any one of <Items 1> to <Item 12>.

Explanation of Reference Numerals

[0117] 31 Relative light quantity distribution of red light 32 Relative light quantity distribution of green light 33 Relative light quantity distribution of blue light 34 Boundary wavelength region 51 Reflectivity distribution of copper 52 Reflectivity distribution of silver 53 Reflectivity distribution of gold 100, 100A Light emission module 110 Substrate 110a Upper surface 110b Lower surface 111 Resin layer 112 Wiring 113 Adhesive member 120 Light source 120r Red light source 120g Green light source 120b Blue light source 120i Infrared light source 120w1, 120w2 White light source 121 Light-emitting element 121r First light-emitting element 121g Second light-emitting element 122, 123 Electrodes 124r First phosphor 124g Second phosphor 125 Wavelength conversion member 126 Light-shielding member 131 Lens 131a Light incident surface 131b Light exit surface 132 Support part 140 Driving part 141 Motor 142 Shaft 150 Control part 170 Rotary connection connector 171 Ring unit 171a Cylindrical body 171b Ring 172 Brush unit 172a Brush 172b Holder 191 Housing 191a Opening 192 Component 193 Close-contact member 200 Light-receiving element 200a First light-receiving part 200b Second light-receiving part 200c Third light-receiving part 201 Photoelectric conversion part 202, 203 Electrodes 210 Processor 300, 300-1, 300-2 Imaging device 400 Front camera 500 display unit 501 display surface 502 shooting button 1000 smartphone Area A1 C1 First virtual circle C2 Second virtual circle D1 Central axis D2 Rotation axis D3 Optical axis DL Biologically received light information Db Biological information F Focus L1, L3, L5, L8 Emitted light L2, L4, L6, L7 Incident light P1, P2, P3 Irradiated surface

Claims

1. A substrate, at least one light source disposed on the substrate, at least one light receiving element disposed on the substrate, and a lens disposed opposite to the light source and the light receiving element, and having: the at least one light source is capable of emitting white light composed of a mixed color light of red light, green light, and blue light, the at least one light receiving element outputs biological light reception information obtained by receiving at least one of reflected light and scattered light of the light emitted from the at least one light source by a living body, a light emitting module.

2. the at least one light source includes a plurality of light sources, the plurality of light sources include a red light source that emits red light, a green light source that emits green light, a blue light source that emits blue light, and an infrared light source that emits infrared light, the at least one light receiving element outputs biological light reception information obtained by receiving at least one of reflected light and scattered light of the light emitted from the plurality of light sources by a living body, the light emitting module according to claim 1.

3. the plurality of light sources further includes a white light source that emits white light, the light emitting module according to claim 2.

4. the red light source includes a first light emitting element that emits blue light, and a first phosphor that wavelength-converts at least a part of the blue light emitted from the first light emitting element to emit red light, the green light source includes a second light emitting element that emits blue light, and a second phosphor that wavelength-converts at least a part of the blue light emitted from the second light emitting element to emit green light, the light emitting module according to claim 2 or claim 3.

5. further having a processor capable of outputting biological information regarding the living body based on the biological light reception information output from the light receiving element, the light emitting module according to claim 2 or claim 3.

6. the plurality of light sources are arranged in a circular ring shape, the light emitting module according to claim 2 or claim 3.

7. having a driving unit capable of rotating the substrate with the central axis of the circular ring as a rotation axis, the light emitting module according to claim 6.

8. the rotation axis of the substrate by the driving unit coincides with the optical axis of the lens, the light emitting module according to claim 7.

9. having a control unit capable of controlling the emission of light from the plurality of light sources, the light emitting module according to claim 2.

10. The at least one light receiving element has a plurality of light receiving portions with different spectral responsivities, The light emitting module according to claim 2, wherein the plurality of light receiving portions are further capable of outputting light receiving information regarding ambient light.

11. The at least one light source is a white light source that emits white light, The white light source includes a light emitting element that emits blue light and a wavelength conversion member disposed on the light emitting element, The wavelength conversion member, A first phosphor that wavelength-converts at least a part of the blue light emitted from the light emitting element to emit red light, A second phosphor that wavelength-converts at least a part of the blue light emitted from the light emitting element to emit green light, The light emitting module according to claim 1, further comprising a third phosphor that wavelength-converts at least a part of the blue light emitted from the light emitting element to emit infrared light.

12. The light emitting module according to claim 11, wherein the at least one light receiving element includes a plurality of light receiving portions with different spectral responsivities.

13. A smartphone including the light emitting module according to claim 1.

Images