Light-emitting module

Abstract

To provide a light-emitting module in which a light receiving element can precisely receive light.SOLUTION: A light-emitting module comprises a plurality of light-emitting elements arranged on a mount surface, one or more optical members controlling light emitted from the plurality of light-emitting elements respectively to emit output light and monitor light for controlling the output of the output light, and a detection unit detecting the monitor light, wherein: the one or more optical members include a first optical member that the light emitted from the plurality of light-emitting elements impinge on, the plurality of light-emitting elements including a plurality of first light-emitting elements which are all of the light-emitting elements whose light impinges on the first optical member; and the detection unit has a first condenser lens which has an incidence surface that the monitor light impinges on and condenses the monitor light impinging on the incidence surface, and a light receiving element which has a light reception surface smaller in area than the incidence region that the monitor light impinges on, on the incidence surface of the first condenser lens, and receives the monitor light emitted from the first condenser lens, the monitor light impinging on the incidence region of the first condenser lens including light obtained with the light emitted from the plurality of first light-emitting elements respectively.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light emitting module. [Background technology]

[0002] Patent Document 1 discloses a technique in which light from a light source is split into transmitted light and reflected light, the reflected light is used as monitor light, and the light source is controlled based on the amount of monitor light. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO2021-162047A1 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to allow a light receiving element to receive light with high accuracy, further technology may be required, and an object of the present invention is to provide a light emitting module that can realize this. [Means for solving the problem]

[0005] The light-emitting module of the present disclosure comprises a plurality of light-emitting elements arranged on a mounting surface, one or more optical members that control the light emitted from each of the plurality of light-emitting elements to emit output light and monitor light for controlling the output of the output light, and a detection unit that detects the monitor light, wherein the one or more optical members include a first optical member onto which light emitted from the plurality of light-emitting elements is incident, and the plurality of light-emitting elements include a plurality of first light-emitting elements that are all light-emitting elements that are incident on the first optical member, and the detection unit comprises a first collecting lens that has an incident surface onto which the monitor light is incident and that collects the monitor light that has been incident on the incident surface, and a light-receiving element that has a light-receiving surface with an area smaller than the incident area onto which the monitor light is incident on the incident surface of the first collecting lens and that receives the monitor light emitted from the first collecting lens, and wherein the monitor light that is incident on the incident area of ​​the first collecting lens includes light obtained by light emitted from each of the plurality of first light-emitting elements. [Effects of the Invention]

[0006] According to the embodiment of the present disclosure, it is possible to allow the light receiving element to receive light with high accuracy. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a plan view schematically showing the inside of the light-emitting module according to the embodiment. [Figure 2] 2A to 2C are explanatory diagrams schematically illustrating the configuration of a light-emitting module according to an embodiment. [Figure 3] 3A and 3B are explanatory diagrams schematically illustrating a detection unit of the light-emitting module according to the embodiment. [Figure 4] 10A and 10B are explanatory diagrams schematically illustrating the light distribution of a rod integrator used in the detection unit of the light-emitting module according to the embodiment. [Figure 5] 3 is a schematic diagram showing a detection unit and a control mechanism of the light-emitting module according to the embodiment; FIG. [Figure 6] 5A and 5B are explanatory diagrams schematically illustrating the state of light from a detection unit of the light-emitting module according to the embodiment. [Figure 7A] 10A and 10B are cross-sectional views schematically showing other configurations of the rod integrator used in the light-emitting module according to the embodiment. [Figure 7B] 10A and 10B are cross-sectional views schematically showing other configurations of the rod integrator used in the light-emitting module according to the embodiment. [Figure 7C] 10A and 10B are cross-sectional views schematically showing other configurations of the rod integrator used in the light-emitting module according to the embodiment. [Figure 8A] 10 is an explanatory diagram schematically showing a first modified example of the detection unit of the light-emitting module according to the embodiment. FIG. [Figure 8B] 10 is an explanatory diagram schematically showing a second modified example of the detection unit of the light-emitting module according to the embodiment. FIG. [Figure 8C] FIG. 10 is an explanatory diagram schematically showing a third modified example of the detection unit of the light-emitting module according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] The drawings referred to in the following description of the embodiments are intended to provide a schematic illustration of the present invention, and therefore the scale, spacing, and positional relationships of each component may be exaggerated, or some components may be omitted. The scale and spacing of each component may not be consistent. In the following description, the same names and symbols generally indicate the same or similar components, and detailed descriptions will be omitted as appropriate. Furthermore, in the configuration of the light-emitting module, terms such as "upper," "lower," "left," and "right" are interchangeable depending on the situation. In this specification or claims, expressions such as "upper," "lower," etc. merely describe the relationship of relative position, orientation, direction, etc., and do not necessarily correspond to the relationship during use.

[0009] Furthermore, in this specification or the claims, when there are multiple equivalents to a certain element and each is to be expressed separately, the element may be distinguished by adding "first" or "second" to the beginning of the element. Furthermore, when the objects or viewpoints distinguished between this specification and the claims are different, the same reference numerals may not refer to the same objects between this specification and the claims.

[0010] First Embodiment A light-emitting module 100A according to a first embodiment will be described. FIGS. 1 to 5 are drawings for explaining an exemplary embodiment of the light-emitting module 100A. FIG. 1 is a plan view schematically showing the interior of the light-emitting module according to the embodiment. FIG. 2 is an explanatory diagram schematically showing each component of the light-emitting module according to the embodiment. FIG. 3 is an explanatory diagram schematically showing the detection unit of the light-emitting module according to the embodiment. FIG. 4 is an explanatory diagram schematically showing the light distribution of a rod integrator used in the detection unit of the light-emitting module according to the embodiment. FIG. 5 is a schematic diagram schematically showing the detection unit and control mechanism of the light-emitting module according to the embodiment. Note that the symbol L indicating light is used to collectively indicate the optical system 10A, and L1, L2, and L3 indicate the traveling directions of the first light from the first optical system 10A1, the second light from the second optical system 10A2, and the third light from the third optical system 10A3, respectively. Furthermore, light obtained by light emitted from the light-emitting element 12A and output to the outside by an optical member is referred to as output light L. OUT The light used for monitoring to control the output light is the monitor light L MON Display as.

[0011] The light emitting module 100A includes a plurality of light emitting elements 12A, one or more optical members 36A, and a detection unit 7A. The one or more optical members 36A include a first optical member 36A1 into which light emitted from the plurality of light emitting elements 12A is incident. The plurality of light emitting elements 12A include a plurality of first light emitting elements 12A1 constituted by all of the light emitting elements 12A that are incident on one first optical member 36A1. The one or more optical members 36A control the light L emitted from each of the plurality of light emitting elements 12A to output light L. OUT and the output light L OUT Monitor light L for controlling the output MON The detection unit 7A emits the monitor light L MON The detection unit 7A also has a first condenser lens (hereinafter referred to as a first condenser lens for detection) 71A and a light receiving element 75A. The first condenser lens for detection 71A receives the monitor light L MON The incident surface is a plane on which the monitor light L is incident. MON The light receiving element 75A is connected to a first condenser lens for detection (hereinafter referred to as the first condenser lens for detection) 71A, and receives the monitor light L at the incident surface of the first condenser lens for detection 71A. MON The light receiving surface has an area smaller than the incident area where the monitor light L emitted from the first condenser lens for detection 71A is incident. MON The monitor light incident on the incident area of ​​the first detection condenser lens 71A includes light obtained by the light emitted from each of the plurality of first light emitting elements 12A.

[0012] In the light-emitting module 100A, the detection unit 7A includes a filter 72A, a diffuser 73A, and a rod integrator 74A. The detection unit 7A includes, from the first detection condenser lens 71A side, a filter 72A, a diffuser 73A, and a rod integrator 74A between the first detection condenser lens 71A and the light-receiving element 75A. The light-emitting module 100A has each component installed within a housing 9. The light-emitting module 100A outputs a detection signal from the detection unit 7A and sends it to a control unit 80, which controls the power supply of the light source 1A based on the detection signal. The light-emitting module 100A also includes, for example, an optical system 10A including a plurality of light-emitting devices 2A each having a light-emitting element 12A and one or more optical members 36A within the housing 9, and a detection unit 7A that detects monitor light from the optical system 10A.

[0013] (Components of light-emitting module) The light-emitting module 100A includes a housing 9 having a light extraction port 8 for extracting light, one or more optical systems 10A provided inside the housing 9, and one or more detection units 7A. As shown in FIG. 1 , the illustrated example of the light-emitting module 100A includes multiple optical systems 10A, each including a first optical system 10A1, a second optical system 10A2, and a third optical system 10A3. The light-emitting module 100A also includes multiple detection units 7A, each including a first detection unit 7A1, a second detection unit 7A2, and a third detection unit 7A3. The light-emitting module 100A further includes a heat sink 20. In the light-emitting module 100A, each optical system 10A can be driven independently. This allows the light emitted from each optical system to be output to the outside through the light extraction port 8, either individually or mixed together. Heat generated by the light source 1A included in each optical system 10A is dissipated by the heat sink 20.

[0014] (Housing) The housing 9 has an upper surface, a lower surface, and one or more side surfaces. The housing 9 is formed in the shape of a rectangular parallelepiped with an opening on one surface. The housing 9 has an arrangement area in which one or more optical systems are arranged. The arrangement area may be composed of one plane or multiple planes. For example, the arrangement area may have a stepped structure, with components arranged on each of the upper and lower planes. A light extraction port 8 is formed as an opening on one side of the housing 9, and is formed by covering a through-hole on the side with a light-transmitting member. The light-transmitting member may be, for example, light-transmitting glass. Here, being light-transmitting means having a transmittance of 90% or more for visible light or light in a specific wavelength range (color) of visible light.

[0015] The housing 9 can be formed using, for example, a metal such as aluminum as the main material. The housing 9 is also formed from a material having light-blocking properties. Having light-blocking properties means that the transmittance of visible light is 5.0% or less. Note that materials other than metal may also be used as the main material. The housing 9 may also have light-blocking properties on each of its upper, lower, and one or more side surfaces by performing a surface treatment that can block light on the inner surface of each surface. Note that the housing 9 is formed so that regions from which light is extracted, such as the light extraction port 8, are translucent.

[0016] (heat sink) The heat sink 20 has an upper surface, a lower surface, and side surfaces. The heat sink 20 also has a mounting surface on which a heat source is mounted. Any of the upper surface, lower surface, or side surface can be the mounting surface. The heat sink 20 dissipates heat generated from the heat source to the outside of the light-emitting module 100A. The heat sink 20 may also have one or more side surfaces. In the illustrated example of the light-emitting module 100A, the heat sink 20 has a rectangular parallelepiped outer shape.

[0017] (optical system) The optical system 10A can be configured with a wavelength conversion function. Alternatively, the optical system 10A can be configured without a wavelength conversion function. Furthermore, when the light emitting module 100A includes multiple optical systems 10A, the multiple optical systems 10A can include optical systems 10A with a wavelength conversion function and optical systems 10A without a wavelength conversion function. Below, the optical systems 10A with a wavelength conversion function and the optical systems 10A without a wavelength conversion function are described. In the example of the light emitting module 100A shown in the figure, the first optical system 10A1 is an optical system 10A without a wavelength conversion function, and the second optical system 10A2 and the third optical system 10A3 are optical systems 10A with a wavelength conversion function.

[0018] (Optical system without wavelength conversion function) The optical system 10A, which does not have a wavelength conversion function, includes a plurality of light emitting devices 2A and a plurality of optical members 36A, including a light source 1A, a condenser lens 3A, a diffusing member 4A1, one or more lenses 5A, and a light reflecting member 6A.

[0019] (light source) The light source 1A includes a plurality of light emitting devices 2A. In the light source 1A, the plurality of light emitting devices 2A are aligned and arranged on a substrate. The light emitting devices 2A emit parallel light from their emission surfaces. The light emitting devices 2A include a light emitting element 12A, such as a semiconductor laser element, that emits laser light, and a lens that collimates the light emitted from the light emitting elements 12A. Therefore, it can be said that the light source 1A includes a plurality of light emitting elements 12A. The light source 1A may be configured by arranging the light emitting elements 12A on a substrate instead of the light emitting devices 2A.

[0020] The light source 1A is mounted on a mounting surface. A plurality of light emitting devices 2A are arranged on the mounting surface, and a plurality of light emitting elements 12A are also arranged on the mounting surface. In the light source 1A, the plurality of light emitting elements 12A are arranged side by side. Among the plurality of light emitting elements 12A arranged side by side, the light emitting element 12A arranged at the end is referred to as the first light emitting element 12A, and one or more light emitting elements 12A arranged between the plurality of first light emitting elements 12A are referred to as the second light emitting element 12A. In the illustrated example of the light emitting module 100A, the light source 1A has 16 light emitting elements 12A aligned in four rows and four columns, with the first light emitting elements 12A at each of the four corners and a total of 12 second light emitting elements 12A between them.

[0021] The light emitting element 12A is not limited to a semiconductor laser element, and may be a light emitting element such as an LED or an organic EL. For example, the light emitting element 12A may be a light emitting element that emits light having an emission peak wavelength in the range of 365 nm to 494 nm. Note that light having a peak wavelength outside this range may also be used. Furthermore, in the light source 1A, all the light emitting elements 12A are configured to emit light of the same color. Alternatively, the light source 1A may include a plurality of light emitting elements 12A that emit light of the same color but with emission peak wavelengths that differ within a range of several nm. Here, the range of several nm is, for example, a range of ±5 nm. Note that the light source 1A may include a plurality of light emitting elements 12A that emit different peak wavelengths. For example, the light source 1A may include a light emitting element 12A that emits blue light and a light emitting element 12A that emits purple light.

[0022] Here, blue light refers to light whose emission peak wavelength is in the range of 430 nm to 494 nm. Purple light refers to light whose emission peak wavelength is in the range of 365 nm to 429 nm. Examples of light-emitting elements that emit blue or purple light include semiconductor laser elements containing nitride semiconductors. Examples of nitride semiconductors that can be used include GaN, InGaN, and AlGaN.

[0023] (condensing lens) The condenser lens 3A is one of the optical members 36A onto which light emitted from the plurality of light-emitting elements 12A is incident. The condenser lens 3A is a lens that condenses light. For example, the condenser lens 3A may be a plano-convex lens having one surface formed as a convex lens and the opposite surface formed as a flat surface. The condenser lens 3A may be a single lens or a double lens as long as it is a lens that condenses light.

[0024] (diffusion material) The diffusing member 4A1 is one of the optical members 36A onto which light emitted from the plurality of light-emitting elements 12A is incident. The diffusing member 4A1 has an incident surface 4A1a and an exit surface 4A1b. The light incident on the incident surface 4A1a is diffused and exits from the exit surface 4A1b. The diffusing member 4A1 is formed, for example, in the shape of a rectangular plate or a circular plate. The diffusing member 4A1 is made of a transparent material, such as glass or a resin material, and is formed to diffuse and transmit the incident light. That is, the diffusing member 4A1 is formed to diffuse light by, for example, providing fine irregularities on one or both surfaces of the diffusing member 4A1 as a light-diffusing structure, or by dispersing materials with different refractive indices in the diffusing member.

[0025] The diffusing member 4A1 can be made of a base material such as epoxy resin, silicone resin, a mixture of these resins, or a translucent material such as glass, containing white inorganic fine particles such as SiO2 or TiO2 as a diffusing material. Alternatively, the diffusing material can be a light-reflective white resin or metal processed into fine particles. By incorporating these diffusing materials irregularly within the base material, the light passing through the light diffusing section is reflected irregularly and repeatedly, diffusing the transmitted light in multiple directions and preventing localized concentration of the irradiated light. The diffusing member 4A1 is preferably shaped like a rectangular plate or a disk.

[0026] (one or more lenses) Each of the one or more lenses 5A is one of the optical members 36A onto which light emitted from the multiple light-emitting elements 12A is incident. The one or more lenses 5A collimate the incident light and emit it as parallel light. The optical system 10A can be configured with multiple lenses 5A, including, for example, a receiver lens 5A11 that first receives light and a collimating lens 5A12 that collimates the light emitted from the receiver lens 5A11. These two lenses 5A have different sizes. Furthermore, these two lenses 5A are supported by a lens holder 45A. The optical axes of the two lenses supported by the lens holder 45A are aligned in a straight line. The lens 5A may also be configured with a single lens.

[0027] The lens holder 45A has a light blocking property and absorbs, reflects, or blocks light irradiated onto the lens holder 45A. The surface of the lens holder 45A is formed so as to be able to block light by optical effects such as absorption, reflection, or light blocking. The lens holder 45A is formed of, for example, a resin material or a metal material. It is desirable that a light blocking means is formed on the surface of the lens holder 45A by blasting or by providing a light blocking film.

[0028] (Light reflecting material) The light reflecting member 6A is one of the optical members 36A onto which light emitted from the plurality of light emitting elements 12A is incident. The light reflecting member 6A reflects light within a predetermined wavelength range. The reflectance here is 80% or more. The light reflecting member 6A also transmits light within a wavelength range different from this predetermined wavelength range. The transmittance here is 80% or more. The light reflecting member 6A also has a first surface onto which light is incident. A second surface is provided on the opposite side of the first surface. As an example, a dichroic mirror is used as the light reflecting member 6A.

[0029] Light in a specific wavelength range is emitted from this optical system 10A. The light in the specific wavelength range is, for example, light within the wavelength range of light emitted from the light-emitting element 12A. The light in the specific wavelength range is also light within the wavelength range of light diffused and emitted by the diffusing member 4A1 based on the light from the light-emitting element 12A. Furthermore, the light in the specific wavelength range is light at the peak wavelength emitted from the light-emitting element 12A, or light included in the light at the peak wavelength that is diffused and emitted.

[0030] (Optical system with wavelength conversion function) The optical system 10A having a wavelength conversion function includes a light source 1A having one or more light emitting devices 2A. The optical system 10A also includes multiple optical members 36A, including a condenser lens 3A, a wavelength conversion member 4A, one or more lenses 5A, and a light reflecting member 6A. The wavelength conversion member 4A may be included as part of a phosphor wheel. The optical system 10A having a wavelength conversion function specifically includes a second optical system 10A2 and a third optical system 10A3, and the overlapping components have already been described.

[0031] (phosphor wheel) The phosphor wheel 40A includes a disk 40A1 on which one or more wavelength conversion members are formed in the shape of an annular band, a support 40A2 that rotatably supports the disk 40A1, and a rotation driver 40A3 that rotates the disk 40A1. In the case of the disk 40A1 having multiple wavelength conversion members, the multiple wavelength conversion members are each in the shape of an annular band with a different radius and are spaced apart from each other. The disk 40A1 is made of a light-transmitting material formed into a disk shape. Sapphire can be used as the material for the disk 40A1. Alternatively, other light-transmitting materials can be used, such as thermoplastic resins (e.g., acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate, polyester), thermosetting resins (e.g., epoxy resin, silicone resin), or other resin materials, such as glass.

[0032] (wavelength conversion material) The wavelength conversion member 4A is one of the optical members 36A onto which light emitted from the plurality of light-emitting elements 12A is incident. The wavelength conversion member 4A is provided in an annular band shape on the inner side of the disk 40A1, closer to the center than the outer edge, and is coated with a wavelength-converting phosphor, quantum dots, or the like. The phosphor may be, for example, a garnet-based phosphor such as a YAG phosphor or a LAG phosphor. Other phosphors may also be used. The phosphor may be a combination of multiple types of phosphors. For example, color rendering properties and color reproducibility can be adjusted by using phosphors with different emission colors in a combination or blending ratio appropriate for a desired color tone. The rotation drive unit 40A3 may be a drive motor that rotates the disk 40A1. The rotation drive unit 40A3 may be, for example, a DC motor, a brush motor, a brushless motor, a stepping motor, or the like, and is preferably one that can rotate in one direction and the other direction.

[0033] (One or more lenses, light reflecting members) Each of the one or more lenses 5A is one of the optical members 36A onto which the fluorescence converted by the wavelength conversion member 4A from the light emitted from the multiple light emitting elements 12A is incident. The one or more lenses 5A collimate the incident light and emit it as parallel light. Here, the light emitted from the light-emitting element 12A or the light converted from the light emitted from the light-emitting element 12A by the wavelength conversion member 4A can be referred to as the light obtained from the light emitted from the light-emitting element 12A. In other words, the light obtained from the light emitted from the light-emitting element 12A may be the light itself emitted from the light-emitting element 12A, or may be other light obtained using the light emitted from the light-emitting element 12A. The light incident on one or more lenses 5A may include not only light whose wavelength has been converted by the wavelength conversion member 4A but also part of the light emitted from the light emitting element 12A. For example, not all of the light emitted from the light emitting element 12A may be converted by the wavelength conversion member 4A, and only part of the light may be emitted from the wavelength conversion member 4A. The light reflecting member 6A is one of the optical members 36A onto which light obtained by the light emitted from the plurality of light emitting elements 12A is incident.

[0034] (detection unit) The detection unit 7A detects the monitor light L MON and controls the light source 1A. The detection unit 7A includes a first detection condenser lens 71A and a light receiving element 75A that detects light condensed by the first detection condenser lens 71A. Note that, as an example here, the detection unit 7A includes, between the first detection condenser lens 71A and the light receiving element 75A, a filter 72A, a diffuser plate 73A, and a rod integrator 74A (7A14, 7A24, 7A34) in this order from the first detection condenser lens 71A side.

[0035] The optical axis of the first condenser lens for detection 71A is set to the same as that of the monitor light L irradiated onto the incident surface. MON First condenser lens for detection 71A and light receiving element 75A are arranged so that the optical axis of first condenser lens for detection 71A passes through the approximate center of diffuser plate 73A, the approximate center of rod integrator 74A, and the center of light receiving element 75A. The filter 72A filters the monitor light L MON For example, the filter 72A passes light of a desired wavelength to be received by the light receiving element 75A and blocks light of other wavelengths. MON The filter 72A blocks either the light emitted from the light emitting element 12A or the light whose wavelength has been converted by the wavelength conversion member 4A, and passes the other light. As an example, the filter 72A can be an optical filter such as a band-pass filter, a notch filter, an edge filter, or a dichroic filter. The filter 72A is used to filter the monitor light L in the first optical system 10A1 to the third optical system 10A3 described later. MON The filter is configured to transmit or block different wavelengths of light depending on the wavelength of the light.

[0036] The diffuser plate 73A diffuses the monitor light L incident from the first condenser lens for detection 71A. MONThe diffuser plate 73A diffuses the monitor light L. The diffuser plate 73A diffuses light that is concentrated in a specific direction, for example, to make the light uniform. The diffuser plate 73A can be formed by including a diffusing substance in the base material. The diffuser plate 73A can also be formed by providing irregularities on the front and back surfaces. The diffuser plate 73A diffuses the monitor light L. MON By diffusing the light, the state of light from light-emitting element 12A of the light source can be easily observed by light-receiving element 75A. Unnecessary light is removed by filter 72A, and only desired light is diffused and sent out by diffuser plate 73A. In other words, diffuser plate 73A can diffuse the desired light and send it to rod integrator 74A. In order to allow as much light as possible to enter rod integrator 74A, diffuser plate 73A is preferably disposed near rod integrator 74A.

[0037] Furthermore, the rod integrator 74A adjusts the intensity distribution of the light emitted from the rod integrator 74A so that the light based on each light-emitting element 12A is received near the center of the rod integrator 74A. The rod integrator 74A can be one whose inner cylindrical shape is a polygon with four or more corners or a circular cross-sectional shape. It is particularly preferable for the rod integrator 74A to have a polygonal inner cylindrical shape with chamfered corners to form a curved or arc shape without sharp corners. It is preferable to use a polygonal rod integrator 74A, for example, one whose four corners are chamfered. This allows the peaks PK of transmitted light to be generated at the four corners, while the light based on each light-emitting element 12A is more uniformly distributed near the center. By concentrating the light based on each light-emitting element 12A near the center of the light emitted from the rod integrator 74A, the monitor light L received by the light-receiving element 75A can be uniform even if there is a deviation due to the mounting accuracy of the light-receiving element 75A. MON This makes it possible to obtain a light reception result that reflects the light state of the light emitting element 12A of the light source 1A.

[0038] The light receiving element 75A receives the monitor light L sent from the rod integrator 74A. MONThe light receiving element 75A has a light receiving surface smaller than the irradiation area of ​​the rod integrator 74A. The light receiving element 75A is, for example, a PD (photodiode) as a photodetector. As an example, the light receiving element 75A is disposed at a position facing the irradiation area at the center of the rod integrator 74A. The light receiving element 75A receives monitor light L that is equal to or greater than a predetermined threshold. MON When the light receiving element 75A receives the monitor light L, the light receiving element 75A sends a detection signal to the control unit 80. MON Here, the light is diffused by the diffuser plate 73A and further adjusted by the rod integrator 74A so as to reflect the overall light emission state of the plurality of light emitting elements 12A on the light source 1A side. Therefore, for example, if any of the light emitting elements 12A does not emit light, the influence of this is reflected in the monitor light L MON The monitor light is reflected in MON By detecting a part of the light emitting element 12A, the state of the entire light emitting element 12A can be determined.

[0039] That is, in the detection unit 7A, in order to detect a failure of any of the plurality of light-emitting elements 12A, the light-receiving surface is widely irradiated with light from the light-emitting elements 12A, making it easier to detect the state of each of the light-emitting elements 12A. MON A detection signal is output to the control unit 80.

[0040] The control unit 80 generates a control signal based on the detection signal sent from the detection unit 7A (or the absence of a detection signal), and controls the light source 1A. The control unit 80 includes an input unit 81 that receives the detection signal from the light receiving element 75A, a comparison unit 82 that compares the detection signal received by the input unit 81 with preset conditions, a determination unit 84 that determines whether the detection signal compared by the comparison unit 82 is normal, a control signal generation unit 85 that generates a control signal for controlling the power supply of the light source 1A based on the result of determination by the determination unit 84, and an output unit 86 that sends the control signal generated by the control signal generation unit 85 to the power supply.

[0041] The input unit 81 is an interface that receives a detection signal from the light receiving element 75A and sends it to the determination unit 84. Here, as an example, the input unit 81 is configured to recognize that a detection signal has not been sent using a timer. When a detection signal is sent, the timer is reset. The light receiving element 75A detects a monitor light L that is equal to or greater than a predetermined threshold value. MON When the monitor light L is received, a detection signal is output. MON Therefore, when the timer is activated and a predetermined time has elapsed since the detection signal was not input, the input unit 81 detects that the light receiving element 75A is receiving monitor light L above the threshold. MON The comparator 82 outputs, for example, a value of zero, which indicates that the light is not received.

[0042] The comparison unit 82 compares the value of the detection signal sent from the input unit 81 with a preset condition and sends the comparison result to the determination unit 84. The comparison unit 82 uses, for example, the output light L OUT The monitor light L corresponding to the value of MON The output light L desired by the user in a normal state is output to the determination unit. OUT When the monitor light L is emitted, the monitor light L is received by the light receiving element 75A. MON The allowable range for the value of the monitor light L when all the light emitting elements 12A are operating within a range that can be considered normal is stored in advance in the storage unit 83. MON The light emitted from the light emitting element 12A fluctuates in accordance with changes in the ambient temperature in accordance with the temperature characteristics, so if it is within this fluctuation range, it can be said that the light emitting element 12A is not malfunctioning and is in a normal operating range. On the other hand, if it exceeds this fluctuation range, it can be determined that there is a high possibility that some kind of malfunction has occurred in the light emitting element 12A. When the value of the detection signal sent is within the allowable range, the comparison unit 82 compares it with a positive value indicating a normal state and an ideal value (output light L OUT The monitor light L corresponding to the value of MONThe comparison unit 82 sends a signal indicating the difference with respect to the value of the detection signal (value of the detection signal) to the determination unit 84. Furthermore, if the value of the detection signal is not within the allowable range, the comparison unit 82 sends a signal with a negative value indicating an abnormal state to the determination unit 84.

[0043] Based on the signal sent from the comparison unit 82, the determination unit 84 determines whether the monitor light L received by the light receiving element 75A is MON If the signal sent from the comparison unit 82 is a negative value, the determination unit 84 instructs the control signal generation unit 85 to generate an error signal indicating an abnormal state. If the signal sent from the comparison unit 82 is a positive value, the determination unit 84 determines whether the amount of monitor light L is appropriate based on the difference from the ideal value. MON The control signal generator 85 is instructed to generate a signal to decrease, increase, or maintain the light intensity of the light source 1A so that the value of approaches the ideal value.

[0044] The control signal generating unit 85 generates a control signal based on the instruction received from the determining unit 84 and sends it to the output unit 86. For example, when the light from the light source 1A is weak, the determining unit 84 determines that the control signal generating unit 85 is instructed to generate a signal to increase the light intensity of the light source 1A, and thus generates a control signal to control the light output from the light source 1A to be higher. Also, for example, when the light from the light source 1A is strong, the determining unit 84 determines that the control signal generating unit 85 is instructed to generate a signal to decrease the light intensity of the light source 1A, and thus generates a control signal to control the light output from the light source 1A to be lower. Note that, for example, when the signal sent from the determining unit 84 is zero, the control signal generating unit 85 does not generate a control signal, or generates a control signal to maintain the state of the light source 1A. Also, when an abnormal state occurs, the control signal generating unit 85 generates an error signal to notify a display unit such as a monitor that an error has occurred.

[0045] (Light emitting module 100A) Next, the light emitting module 100A will be described. The light emitting module 100A is equipped with one or more optical systems 10A. The one or more optical systems 10A include an optical system 10A that does not have a wavelength conversion function. The one or more optical systems 10A further include an optical system 10A that has a wavelength conversion function.

[0046] The illustrated example of the light-emitting module 100A includes a first optical system 10A1 that does not have a wavelength conversion function, and a second optical system 10A2 and a third optical system 10A3 that do have a wavelength conversion function. The first optical system 10A1 includes a plurality of first light-emitting elements 12A1 and one or more first optical members 36A1. The first optical system 10A1 includes a first light source 1A1 that has a plurality of first light-emitting elements 12A1. The one or more first optical members 36A1 include a first condenser lens 3A1, a diffusing member 4A1, a first lens 5A1, and a first light-reflecting member 6A1. The second optical system 10A2 includes a plurality of second light-emitting elements 12A2 and one or more second optical members 36A2. The second optical system 10A2 includes a second light source 1A2 that has a plurality of second light-emitting elements 12A2. Furthermore, the one or more second optical members 36A2 include a second collecting lens 3A2, a second wavelength conversion member 4A2, a second lens 5A2, and a second light reflecting member 6A2. The third optical system 10A3 includes a plurality of third light-emitting elements 12A3 and one or more third optical members 36A3. The third optical system 10A3 includes a third light source 1A3 having a plurality of third light-emitting elements 12A3. The one or more third optical members 36A3 include a third collecting lens 3A3, a third wavelength conversion member 4A3, a third lens 5A3, and a third light reflecting member 6A3.

[0047] The one or more optical systems 10A emit light beams having different peak wavelengths toward the light extraction port 8. In the illustrated example of the light-emitting module 100A, the peak wavelength of the light (first light) emitted from the first optical system 10A1, the peak wavelength of the light (second light) emitted from the second optical system 10A2, and the peak wavelength of the light (third light) emitted from the third optical system 10A3 are different from one another.

[0048] One or more optical systems 10A are mounted within the housing 9. Each of the multiple optical systems 10A is installed in a parallel arrangement within the housing 9. The multiple optical systems 10A are arranged so that light from the multiple optical systems 10A is combined when output from the light outlet 8 of the housing 9. When multiple optical systems 10A are mounted, it is preferable that each optical system 10A is appropriately partitioned within the housing 9 so that light emitted from one optical system 10A does not affect the other optical systems 10A.

[0049] The light source 1A provided in each of the one or more optical systems 10A is fixed to a heat sink 20. This allows heat generated from each light source 1A to be dissipated to the outside. The heat sink 20 is installed on the opposite side of the light source 1A from the light extraction port 8. The heat sink 20 is preferably installed outside the housing 9 so as not to retain heat inside the housing 9.

[0050] The first optical system 10A1 in the light-emitting module 100A will now be described. The first light source 1A1 emits a first light L1. The first light L1 travels forward from the first light source 1A1. When emitted from one or more first light-emitting devices 2A1, the first light is composed of one or more light beams. For convenience, the figure shows a virtual optical path of the center G11 of the first light.

[0051] The first light emitted from the first light source 1A1 is collected by the first collecting lens 3A1. Light emitted from all of the light emitting elements 12A1 that make up the first light source 1A1 is incident on the first collecting lens 3A1. The light emitted from the exit surface of the first collecting lens 3A1 travels straight toward the diffusing member 4A1. The first collecting lens 3A1 collects the first light and emits it toward the incident surface 4A1a of the diffusing member 4A1. The exit surface of the first collecting lens 3A1 can be said to be the exit surface from which the first light (collected light) traveling straight toward the diffusing member 4A1 is emitted. When viewed in a plane parallel to the light-emitting surface of the first light-emitting device 2A1, the first collecting lens 3A1 is disposed so that the optical axis of the first collecting lens 3A1 is positioned on an imaginary line that passes through the center G11 of the light-emitting position of the first light and is perpendicular to the light-emitting surface of the first light-emitting device 2A1. Here, this imaginary line and a line that passes through the optical axis of the first collecting lens 3A1 are in a positional relationship where they overlap.

[0052] The first light (condensed light) condensed by the first condensing lens 3A1 is irradiated onto the incident surface 4A1a of the diffusing member 4A1. The center G12 of the irradiation area RE1 of the first light (condensed light) irradiated onto the incident surface 4A1a of the diffusing member 4A1 is on the above-mentioned imaginary straight line. The first light (condensed light) irradiated onto the incident surface 4A1a of the diffusing member 4A1 is diffused and emitted from the exit surface 4A1b of the diffusing member 4A1. The first light (diffused light) emitted from the exit surface 4A1b of the diffusing member 4A1 is incident on the first lens 5A1 (receiver lens 5A11 and collimator lens 5A12). The first light incident on the first lens 5A1 is emitted toward the light outlet 8 of the housing 9 by the first light reflecting member 6A1.

[0053] The first lens 5A1 collimates the first light (diffused light) emitted from the exit surface 4A1b of the diffusing member 4A1. The collimated first light is emitted from the exit surface of the first lens 5A1. The first lens 5A1 is designed to collimate the diffused light emitted from the focal point of the first lens 5A1 to the first lens 5A1. Furthermore, the light passing through the optical axis of the first lens 5A1 is at the center or approximately the center of the collimated first light.

[0054] Collimated light emitted from the first lens 5A1 is incident on the first light reflecting member 6A1. The first light reflecting member 6A1 reflects the first light incident on the first light reflecting member 6A1. The first light reflected by the first light reflecting member 6A1 travels toward the light output port 8 and is emitted to the outside from the light output port 8. 80% or more of the first light incident on the first light reflecting member 6A1 is reflected by the first light reflecting member 6A1. 20% or less of the first light incident on the first light reflecting member 6A1 is transmitted through the first light reflecting member 6A1. At this time, the light reflected by the first light reflecting member 6A1 includes light obtained by the light emitted from each of all the light emitting elements 12A1 that constitute the first light source 1A1, and the light that passes through the first light reflecting member 6A1 includes light obtained by the light emitted from each of all the light emitting elements 12A1 that constitute the first light source 1A1.

[0055] Furthermore, the monitor light L, which is light transmitted through the first light reflecting member 6A1, MON In this way, a part of the first light L1 emitted from the first optical system 10A1 is emitted to the outside from the light outlet 8 of the housing 9 as output light L OUT The remainder is the monitor light L MON In other words, the collimator lens 5A12 converts the output light L OUT and monitor light L MON The mixed light is output as parallel light, and is reflected by the first light reflecting member 6A1 as output light L OUT and parallel monitor light L MON The light is split into two parts and emitted. Monitor light L MON The monitor light L collected by the first light-emitting element 12A1 includes light obtained by the light emitted from each of all the light-emitting elements 12A1 that constitute the first light source 1A1, and the light obtained by the light emitted from each of all the light-emitting elements 12A1 that constitute the first light source 1A1 is incident on the first light-collecting lens for detection 7A11. MON The diffused monitor light L MONThe monitor light L incident on the rod integrator 7A14 is MON The rod integrator 7A14 uniforms the uniformed monitor light L MON The light receiving element 7A15 detects the light when the amount of light incident on the light receiving surface is equal to or greater than a threshold value, and outputs a detection signal to the control unit 80 in accordance with the detection.

[0056] The light receiving element 7A15 is disposed opposite to the center of the rod integrator 7A14, and therefore receives the uniformed monitor light L MON The light receiving element 7A15 receives the monitor light L at the incident surface of the first light collecting lens for detection 7A11. MON The light receiving element 7A15 has a light receiving surface with an area smaller than the area where the monitor light L is incident (hereinafter referred to as the incident area). The light receiving element 7A15 is disposed so that the light receiving surface passes through the optical axis of the first detection condenser lens 7A11. In addition, in a plan view of the incident surface of the first detection condenser lens 7A11 as seen from the optical axis direction, the area of ​​the incident surface of the first detection condenser lens 7A11 is smaller than the area where the monitor light L is incident on this incident surface. MON Among these, the amount of light incident on a region that has the same shape and area as the light-receiving surface of the light-receiving element 7A15 and that includes the optical axis of the first detection collecting lens 7A11 can be equal to or greater than the threshold. In other words, if it is simply desired to have the light-receiving element 7A15 receive light of an amount equal to or greater than the threshold, light of an amount equal to or greater than the threshold can be received on the light-receiving surface of the light-receiving element 7A15 even without the first detection collecting lens 7A11. In this case, the first detection collecting lens 7A11 is provided for the purpose of detecting light emitted from each of all of the light-emitting elements 12A1 that constitute the first light source 1A1.

[0057] Therefore, when the amount of light emitted from any of the light-emitting elements 12A among all the light-emitting elements 12A1 constituting the first light source 1A1 is increased or decreased, the amount of monitor light L emitted from one or more optical members 36A and received by the light-receiving surface of the light-receiving element 75A corresponding to the increase or decrease is MONFurthermore, since the total light from multiple light-emitting elements 12A is dispersed and uniform before passing through rod integrator 7A14, if the light amount of any one of light-emitting elements 12A increases or decreases for some reason, the change in state is reflected in the amount of light received by light-receiving element 75A.

[0058] Next, the second optical system 10A2 in the light-emitting module 100A will be described. The second light source 1A2 emits second light L2. The second light L2 travels forward from the second light source 1A2. The second light L2 travels in the same direction as the first light L1. When emitted from one or more second light-emitting devices 2A2, the second light is composed of one or more light beams. For convenience, the figure shows a virtual optical path of the center G21 of the second light. The second light emitted from the second light source 1A2 is collected by the second collecting lens 3A2. Light emitted from all of the light emitting elements 12A2 that make up the second light source 1A2 is incident on the second collecting lens 3A2. The light emitted from the exit surface of the second collecting lens 3A2 travels straight toward the second wavelength conversion member 4A2. The second collecting lens 3A2 collects the second light and emits it toward the entrance surface of the second wavelength conversion member 4A2.

[0059] The second wavelength converter 4A2 emits the irradiated second light from the emission surface of the second wavelength converter 4A2 as wavelength-converted light. Part or all of the second light irradiated to the second wavelength converter 4A2 is wavelength-converted by the second wavelength converter 4A2. Therefore, the second light emitted from the emission surface of the second wavelength converter 4A2 may include not only wavelength-converted light but also light emitted from the second light emitting device 2A2.

[0060] The second light emitted from the exit surface of the second wavelength conversion member 4A2 is incident on the second lens 5A2. The second light incident on the second lens 5A2 is emitted toward the light extraction port 8 of the housing 9 by the second light reflecting member 6A2. The second light emitted toward the light extraction port 8 of the housing 9 is transmitted through the first light reflecting member 6A1 and is emitted from the light extraction port 8 of the housing 9 as output light L OUT is emitted as The second optical member 36A2 is positioned at a position where an imaginary straight line passes through, connecting the center G21 of the light emission position in a plane parallel to the emission surface of the second light emitting device 2A2 and the center G22 of the light irradiation area RE2 of the second wavelength conversion member 4A2.

[0061] The second light emitted toward the light extraction outlet 8 is light whose wavelength has been converted by the second wavelength conversion member 4A2. The second light emitted toward the light extraction outlet 8 does not include light emitted from the second light emitting device 2A2. Note that the term "not included" here means that a small amount of light that is directed toward the light extraction outlet 8 is acceptable due to the performance of the second optical member 36A2.

[0062] The second optical system 10A2 may include a plurality of second optical members 36A2, including a second lens 5A2 held by a second lens holder 45A2 and a second light reflecting member 6A2. The second light emitted from the exit surface of the second wavelength conversion member 4A2 is incident on the second lens 5A2. The second light emitted from the exit surface of the second lens 5A2 is incident on the second light reflecting member 6A2.

[0063] The second lens 5A2 collimates the second light emitted from the exit surface of the second wavelength conversion member 4A2. The collimated second light is emitted from the exit surface of the second lens 5A2. The second lens 5A2 is designed to collimate the diffused light emitted from the focal point of the second lens 5A2 to the second lens 5A2. In addition, the light passing through the optical axis of the second lens 5A2 is at the center or approximately the center of the collimated second light.

[0064] The collimated light emitted from the second lens 5A2 is incident on the second light reflecting member 6A2. The second light reflecting member 6A2 reflects the second light incident on the second light reflecting member 6A2. The second light reflected by the second light reflecting member 6A2 is reflected as the output light L OUT The second light incident on the second light reflecting member 6A2 travels in the direction of the light outlet 8 and is emitted to the outside from the light outlet 8. Of the second light incident on the second light reflecting member 6A2, the light emitted from the second light emitting device 2A2 passes through the second light reflecting member 6A2 and becomes the monitor light L MONOf the second light incident on the second light reflecting member 6A2, a part of the light whose wavelength has been converted by the second wavelength converting member 4A2 is transmitted through the second light reflecting member 6A2 and is used as monitor light L. MON The light emitted from the second light emitting device 2A2 is used as monitor light L MON The second detection unit 7A2 does not need to use the monitor light L MON is detected, and a detection signal is sent to the control unit 80 to control the power supply of the second light source 1A2. At this time, the light transmitted through the second light reflecting member 6A2 includes light obtained by the light emitted from each of all the light emitting elements 12A2 that constitute the second light source 1A2.

[0065] The third optical system 10A3 in the light-emitting module 100A is the same as the second optical system 10A2 described above. That is, in the description of the second optical system 10A2 described above, the "second light source 1A2" is referred to as the "third light source 1A3," the "second light L2" is referred to as the "third light L3," the "second light emitting device 2A2" is referred to as the "third light emitting device 2A3," the "center G21 of the second light L2" is referred to as the "center G31 of the third light L3," the "second condenser lens 3A2" is referred to as the "third condenser lens 3A3," and the "second wavelength conversion member 4A2" is referred to as the "third wavelength conversion member 4A3." ", "second lens holder 45A2" with "third lens holder 45A3," "second optical member 36A2" with "third optical member 36A3," "second lens 5A2" with "third lens 5A3," "second light reflecting member 6A2" with "third light reflecting member 6A3," and "second detection unit 7A2" with "third detection unit 7A3."

[0066] In the light emitting module 100A, the first light L1, the second light L2, and the third light L3 are aligned on the same axis, and the coaxial light is output from the light output port 8 as output light L OUT The second light reflecting member 6A2 transmits the third light L3, and the first light reflecting member 6A1 transmits the second light L2 and the third light L3. In the light emitting module 100A, the second wavelength conversion member 4A2 and the third wavelength conversion member 4A3 are implemented as components of the phosphor wheel 40A. The second wavelength conversion member 4A2 emits wavelength-converted orange second light L2. The third wavelength conversion member 4A3 emits wavelength-converted green third light L3.

[0067] One or more detection units 7A are implemented in the light emitting module 100A. A detection unit 7A is arranged corresponding to each optical system 10A. The same number of detection units 7A as the number of optical systems 10A provided in the light emitting module 100A are provided. The detection units 7A corresponding to each optical system 10A can be installed inside the housing 9, attached to the housing 9, or installed outside the housing 9.

[0068] Here, as an example, the detection unit 7A includes a first detection unit 7A1 to a third detection unit 7A3. The first detection unit 7A1 detects the monitor light L1 of the first light L1 that has passed through the first light reflecting member 6A1. MON The second detection unit 7A2 detects the monitor light L of the second light L2 that has passed through the second light reflecting member 6A2. MON The third detection unit 7A3 detects the monitor light L of the third light L3 that has passed through the third light reflecting member 6A3. MON From the detection result, the output light L emitted from the light outlet 8 by each optical system 10A is detected. OUT The amount of light emitted from the light outlet 8 can be calculated. OUT The amount of light can be adjusted.

[0069] As shown in FIG. 5, the first light L1 transmitted through the first light reflecting member 6A1, and the second light L2 and third light L3 reflected by the first light reflecting member 6A1 are combined to form the monitor light L. MON and heads towards the first detection unit. The second light L2 transmitted through the second light reflecting member 6A2 and the third light L3 reflected by the second light reflecting member 6A2 are transmitted to the second detection unit 7A2 as monitor light L. MON Heading there as. The third light L3 that has passed through the third light reflecting member 6A3 is the monitor light L MON and heads towards the third detection unit 7A3.

[0070] The first condenser lenses 7A11, 7A21, and 7A31 for detection are used to collect the respective monitor lights L MON is sent to the diffusion plates 7A13, 7A23, and 7A33 via the filters 7A12, 7A22, and 7A32. The diffusion plates 7A13, 7A23, and 7A33 may be provided with the filters 7A12, 7A22, and 7A32 facing each other with a gap therebetween, or facing each other and in contact with each other.

[0071] In the first detection unit 7A1, the filter 7A12 filters the monitor light L1 of the first light L1. MON The second light L2 is transmitted through the monitor light L MON and the third light L3 monitor light L MON The filter 7A12 transmits the light emitted from the light emitting element 12A and diffused by the diffusing member 4A1, and blocks the wavelength-converted second and third lights. In the second detection unit 7A2, the filter 7A22 filters the monitor light L2 of the second light L2. MON The third light L3 is transmitted through the monitor light L MON The filter 7A22 transmits the wavelength-converted second light and blocks the light emitted from the light emitting element 12A. In the third detection unit 7A3, the filter 7A32 filters the monitor light L3 of the third light L3. MON The filter 7A32 transmits the monitor light L that is converted by the third wavelength conversion member 4A3 and sent. MON In other words, filter 7A32 transmits the wavelength-converted third light and blocks the light emitted from light emitting element 12A.

[0072] The monitor light L sent to the first detection unit 7A1 MON The first detection unit 7A1 includes a filter 7A12, so that the first light L1 is filtered by the monitor light L MONOnly the light beam can be received and detected by the first light receiving element 7A15. Furthermore, the detection result of the light received by the light receiving element 7A15 is sent to the control unit 80, which controls the power supply of the first light source 1A1. The monitor light L sent to the second detection unit 7A2 MON is filtered by the filter 7A22 of the second detection unit 7A2, and the second light L2 is filtered by the monitor light L MON Only the light beam can be received and detected by the second light receiving element 7A25. The detection result of the light received by the second light receiving element 7A25 is sent to the control unit 80, which controls the power supply of the second light source 1A2. The monitor light L sent to the third detection unit 7A3 MON The third light L3 is filtered by the filter 7A32 of the third detection unit 7A3. MON Only the light beam can be received and detected by the third light receiving element 7A35. The detection result of the light received by the third light receiving element 7A35 is sent to the control unit 80, which controls the power supply of the third light source 1A3.

[0073] As described above, the light emitting module 100A detects the monitor light L MON Since the light can be received with high accuracy based on the above, it is possible to control the light emitting state of the light emitting element 12A of the light source 1A, and further, it is possible to prevent light from being emitted to the outside in an undesired state. For example, in the light emitting module 100A, even if the diffusing member 4A1 is damaged, the monitor light L MON By accurately receiving and detecting the light, it is possible to control the first light source 1A1 so that the light is not emitted to the outside, for example by turning it off. This makes it possible to realize a light-emitting module that is highly safe with respect to the light output from the light source 1A and that operates in a stable state.

[0074] (Variation) In the detection unit 7A, as an example, rod integrator 74A has been described as having a rectangular inner cylindrical shape with rounded corners as shown in Fig. 4, but rod integrators having a rectangular, circular, or hexagonal cross section may also be used as shown in Fig. 7A to Fig. 7C. Note that rod integrator 74A may be polygonal, such as a pentagon or octagon, or may have more than four sides, and it is more preferable that the corners of the polygon be chamfered.

[0075] The detection unit 7A may have the configuration shown in FIGS. 8A to 8C. 8A to 8C are schematic diagrams showing first to third modified examples of the detection unit. As shown in Fig. 8A, the detection unit 7A may be configured so that light from the first detection condenser lens 71A is directly input to the light receiving element 75A. The light receiving element 75A is preferably disposed so that the center of its light receiving surface faces the optical axis of the first detection condenser lens 71A. The first detection condenser lens 71A collects the collected monitor light L MON The light receiving element 75A is installed so that the monitor light L MON The central area of ​​the light receiving surface can receive light.

[0076] As shown in FIG. 8B, the detection unit 7A may be configured to include a first condenser lens for detection 71A, a diffuser plate 73A, and a light receiving element 75A. The diffuser plate 73A is preferably disposed at a position where its center faces the optical axis of the first condenser lens for detection 71A. The light receiving element 75A is preferably disposed at a position corresponding to the center of the diffuser plate 73A so that the center of the light receiving surface faces the position. The monitor light L sent from the diffuser plate 73A is MON is output over a range wider than the light receiving surface of the light receiving element 75A.

[0077] As shown in Fig. 8C, the detection unit 7A may be configured to include a first condenser lens for detection 71A, a rod integrator 74A, and a light receiving element 75A. It is preferable that the optical axis of the first condenser lens for detection 71A is arranged to face the center of the light receiving surface of the rod integrator 74A. It is also preferable that the center of the rod integrator 74A is arranged to face the center of the light receiving surface of the light receiving element 75A. The monitor light L output from the rod integrator 74A is MON The light beam irradiates a wider area than the light receiving surface of the light receiving element 75A.

[0078] In either case, the light receiving element 75A receives the monitor light L irradiated onto the light receiving surface. MON By receiving this light, it is possible to obtain information about the entire light emitting device 2A on the light source 1A side. [Industrial Applicability]

[0079] The light emitting device described in each embodiment can be used in medical equipment such as endoscopes, projectors, lighting, displays, and the like. [Explanation of symbols]

[0080] 1A light source 1A1 1st light source 1A2 2nd light source 1A3 Third light source 2A light emitting device 2A1 First light-emitting device 2A2 Second light-emitting device 2A3 Third light-emitting device 3A Condenser Lens 3A1 First condenser lens 3A2 Second focusing lens 3A3 Third condenser lens 4A Wavelength conversion material 4A1 Diffusion material 4A2 Second wavelength conversion member (wavelength conversion member) 4A3 Third wavelength conversion member (wavelength conversion member) 5A Lens 5A1 First lens (collimating lens) 5A2 Second lens (collimating lens) 5A3 Third lens (collimating lens) 6A Light reflecting material 6A1 First light reflecting member (dichroic mirror) 6A2 Second light reflecting member (dichroic mirror) 6A3 Third light reflecting member (dichroic mirror) 7A Detection Unit 7A1 First detection unit 7A11 First condenser lens for detection (first condenser lens) 7A12 filter 7A13 Diffuser 7A14 Rod Integrator 7A15 Photodetector 7A2 Second detection unit 7A21 First condenser lens for detection (first condenser lens) 7A22 filter 7A23 Diffuser 7A24 Rod Integrator 7A25 Photodetector 7A3 Third detection unit 7A31 First condenser lens for detection (first condenser lens) 7A32 filter 7A33 Diffuser 7A34 Rod Integrator 7A35 Photodetector 8 Light outlet 9. Cabinet 10A optical system 10A1 1st optical system 10A2 2nd optical system 10A3 Third optical system 20 Heat sink 40A phosphor wheel 45A Lens Holder 45A1 First Lens Holder 45A2 Second Lens Holder 45A3 3rd lens holder 36A Optical Components 36A1 First optical member 36A2 Second optical member 36A3 Third optical member 100A Light Emitting Module

Claims

1. A plurality of light emitting elements arranged on a mounting surface; one or more optical members that control the light emitted from each of the plurality of light-emitting elements to emit output light and monitor light for controlling the output of the output light; a detection unit that detects the monitor light, the one or more optical members include a first optical member onto which light emitted from the plurality of light-emitting elements is incident, The plurality of light-emitting elements include: a plurality of first light-emitting elements, which are all light-emitting elements incident on the first optical member; The detection unit a first condenser lens having an incident surface onto which the monitor light is incident and configured to condense the monitor light incident on the incident surface; a light-receiving element having a light-receiving surface having an area smaller than an incident region on the incident surface of the first condenser lens into which the monitor light is incident, and receiving the monitor light emitted from the first condenser lens; the monitor light incident on the incident region of the first condenser lens includes light obtained by light emitted from each of the plurality of first light-emitting elements; the light receiving element detects light when the amount of light incident on the light receiving surface is equal to or greater than a threshold, and outputs a detection signal corresponding to the detection; an optical axis of the first condenser lens passes through an incident area of ​​the monitor light irradiated onto the incident surface; an optical emission module, wherein, in a planar view of the incident surface from the optical axis direction, the amount of light of the monitor light incident on the incident surface that is incident into an area having the same shape and area as the light receiving surface and that includes the optical axis of the first focusing lens is equal to or greater than the threshold value.

2. The light-emitting module of claim 1, wherein when the amount of light emitted from any of the plurality of light-emitting elements is increased or decreased, the amount of light of the monitor light emitted from the one or more optical elements and received by the light-receiving surface also fluctuates in accordance with the increase or decrease.

3. The detection unit a rod integrator onto which the light condensed by the first condenser lens is incident, 3. The light-emitting module according to claim 1, wherein the light-receiving element receives light emitted from the rod integrator.

4. 4. The light emitting module according to claim 3, wherein the rod integrator has a cross-sectional shape of a polygon with four to eight sides and rounded corners.

5. 5. The light emitting module according to claim 3, further comprising a diffusion plate disposed between the first focusing lens and the rod integrator and in the vicinity of the rod integrator, on which the monitor light emitted from the first focusing lens is incident.

6. a filter onto which the monitor light emitted from the first condenser lens is incident, the one or more optical members include a wavelength conversion member that emits light obtained by converting the wavelength of light emitted from the light emitting element, the monitor light emitted from the one or more optical members includes light emitted from the light emitting element and light whose wavelength has been converted by the wavelength converting member; the filter blocks at least one of the light emitted from the light emitting element and the light whose wavelength has been converted by the wavelength converting member, from the monitor light; The light-emitting module according to claim 1 , wherein the light-receiving element receives light that has passed through the filter.

7. 6. The light-emitting module according to claim 1, wherein the one or more optical elements include a first optical element that collects light emitted from the plurality of light-emitting elements, and a diffusion element that receives light from the first optical element and diffuses it as diffused light.

8. The one or more optical members include: a collimator lens that converts the mixed light of the output light and the monitor light into parallel light; 8. The light emitting module according to claim 1, further comprising a dichroic mirror that separates the mixed light, which has become parallel light, into the output light, which is parallel light, and the monitor light, which is also parallel light.

9. 9. The light emitting module according to claim 1, wherein the light obtained by the light emitted from the light emitting element in the monitor light is the light emitted from the light emitting element or light wavelength-converted from the light emitted from the light emitting element.

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