Light-emitting device

Abstract

To provide a light-emitting device that can change the direction of light emission and allows light from a light emitter to be efficiently extracted to outside.SOLUTION: A light-emitting device 100 includes: a light emitter 1 having a light emission face 1a; a light guide 11 that includes a total reflector 23 to reflect incoming light from the light emitter 1 and a Fresnel lens that receives the light reflected by the total reflector 23, the light guide designed to guide the incoming light; and a movement mechanism 70 that moves the light guide 11 relative to the light emitter 1 along a direction crossing the central axis 1c of the light emission face 1a.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] This disclosure relates to a light-emitting device. [Background technology]

[0002] Conventionally, light-emitting devices including light-emitting diodes have come into widespread use. For example, Patent Document 1 discloses a configuration comprising a light source, a lens that transmits light emitted from the light source in a first direction, and a support mechanism that supports the lens so as to be movable in a second direction intersecting the first direction relative to the light source. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-53194 [Overview of the project] [Problems that the invention aims to solve]

[0004] Light-emitting devices are required to efficiently extract light from the light-emitting section to the outside.

[0005] The embodiments described herein aim to provide a light-emitting device that can change the direction of light irradiation and efficiently extract light from a light-emitting unit to the outside. [Means for solving the problem]

[0006] A light-emitting device according to the embodiment of the present disclosure includes a light-emitting section having a light-emitting surface, a total reflection section that reflects incident light from the light-emitting section, and a Fresnel lens section into which the light reflected by the total reflection section is incident, and further includes a light-guiding member that guides the incident light, and a movement mechanism that moves the light-guiding member relative to the light-emitting section along a direction intersecting the central axis of the light-emitting surface. [Effects of the Invention]

[0007] According to the light-emitting device according to an embodiment of the present disclosure, it is possible to change the irradiation direction of light and provide a light-emitting device that efficiently extracts light from the light-emitting part to the outside.

Brief Description of the Drawings

[0008] [Figure 1] It is a diagram for explaining partial irradiation of light by the light-emitting device according to an embodiment. [Figure 2] It is a diagram showing a first example of a usage scene of the light-emitting device according to an embodiment. [Figure 3] It is a diagram showing a second example of a usage scene of the light-emitting device according to an embodiment. [Figure 4] It is a diagram showing a third example of a usage scene of the light-emitting device according to an embodiment. [Figure 5] It is a cross-sectional view showing the configuration of the light-emitting device according to an embodiment. [Figure 6A] It is a plan view of the light-emitting device according to an embodiment as seen from the light guide member side with the housing and the transparent member omitted. [Figure 6B] It is a cross-sectional view showing a configuration example of a light-emitting device including a plurality of light-emitting parts. [Figure 6C] It is a plan view of the light-emitting device in FIG. 6B as seen from the light guide member side with the housing and the transparent member omitted. [Figure 7] It is a plan view of the light guide member of the light-emitting device according to an embodiment as seen from the light-emitting part side. [Figure 8] It is a cross-sectional view showing an example of the configuration of the light-emitting part of the light-emitting device according to an embodiment. [Figure 9A] It is a cross-sectional view showing another example of the configuration of the light-emitting part of the light-emitting device according to an embodiment. [Figure 9B] It is a plan view of an example of a light-emitting part having a plurality of light-emitting surfaces as seen from the light guide member side. [Figure 10] It is a cross-sectional view showing the optical path of the light-emitting device in a state where the light guide member has not moved. [Figure 11] It is a schematic diagram showing the illuminance distribution of the light-emitting device in FIG. 10. [Figure 12]This is a plan view from the light guide member side, showing the positional relationship between the light guide member and the light-emitting part, which has been moved to one side in the light-emitting device according to the embodiment, with the housing and transparent member omitted. [Figure 13] Figure 12 is a cross-sectional view showing the optical path of the light-emitting device. [Figure 14] Figure 13 is a schematic diagram showing the illuminance distribution of the light-emitting device. [Figure 15] This is a plan view from the light guide member side, showing the positional relationship between the light guide member and the light-emitting part that has been moved to the other side in the light-emitting device according to the embodiment, with the housing and transparent member omitted. [Figure 16] Figure 15 is a cross-sectional view showing the optical path of the light-emitting device. [Figure 17] Figure 16 is a schematic diagram showing the illuminance distribution of the light-emitting device. [Figure 18] This is a cross-sectional view showing the optical path of a light-emitting device according to another example of the embodiment. [Figure 19] Figure 18 is a schematic diagram showing the illuminance distribution of the light-emitting device. [Figure 20] This is a cross-sectional view showing the optical path of the light-emitting device according to the embodiment. [Figure 21] Figure 20 is a schematic diagram showing the illuminance distribution of the light-emitting device. [Figure 22] This is a cross-sectional view showing a first example of the optical path of a light-emitting device according to an embodiment. [Figure 23] Figure 22 is a schematic diagram of the illuminance distribution due to light passing through region A of the light-emitting device. [Figure 24] Figure 22 is a schematic diagram of the illuminance distribution due to light passing through region B of the light-emitting device. [Figure 25] Figure 22 is a schematic diagram of the illuminance distribution due to light passing through region C of the light-emitting device. [Figure 26] This is a schematic diagram of the illuminance distribution obtained by combining the illuminance distributions shown in Figures 23 to 25. [Figure 27] This is a cross-sectional view showing a second example of the optical path of the light-emitting device according to the embodiment. [Figure 28] Figure 27 is a schematic diagram of the illuminance distribution due to light passing through region A of the light-emitting device. [Figure 29]Figure 27 is a schematic diagram of the illuminance distribution due to light passing through region B of the light-emitting device. [Figure 30] Figure 27 is a schematic diagram of the illuminance distribution due to light passing through region C of the light-emitting device. [Figure 31] This is a schematic diagram of the illuminance distribution obtained by combining the illuminance distributions shown in Figures 28 to 30. [Figure 32] This is a cross-sectional view showing a third example of the optical path of the light-emitting device according to the embodiment. [Figure 33] Figure 32 is a schematic diagram of the illuminance distribution due to light passing through region A of the light-emitting device. [Figure 34] Figure 32 is a schematic diagram of the illuminance distribution due to light passing through region B of the light-emitting device. [Figure 35] Figure 32 is a schematic diagram of the illuminance distribution due to light passing through region C of the light-emitting device. [Figure 36] This is a schematic diagram of the illuminance distribution obtained by combining the illuminance distributions shown in Figures 33 to 35. [Figure 37] This is a cross-sectional view showing the first example of the positional relationship between the light guide member and the light-emitting part in the height direction. [Figure 38] This is a cross-sectional view showing a second example of the positional relationship between the light guide member and the light-emitting part in the height direction. [Figure 39] This is a cross-sectional view showing a third example of the positional relationship between the light guide member and the light-emitting part in the height direction. [Figure 40] This is a cross-sectional view showing a fourth example of the positional relationship between the light guide member and the light-emitting part in the height direction. [Figure 41] This figure shows the relationship between the amount of movement of the light guide member and the illuminance distribution according to the first embodiment. [Figure 42] This figure shows the relationship between the amount of movement of the light guide member and the illuminance distribution according to the second embodiment. [Figure 43] This figure shows the relationship between the amount of light guide member movement and the illuminance distribution in a comparative example. [Figure 44A] This is a cross-sectional view illustrating an example of the dimensions of a light-emitting device according to an embodiment. [Figure 44B] This is a magnified view of area Q in Figure 44A. [Figure 44C] This is a perspective view of the light guide member from the -Z side. [Figure 45]This is a cross-sectional view showing the configuration of the light-emitting device according to the first modified example. [Figure 46] This is a cross-sectional view showing the light-emitting part of the light-emitting device in Figure 44 in a moved state. [Figure 47] This is a cross-sectional view showing the configuration of the light-emitting device according to the second modified example. [Figure 48] This is a cross-sectional view showing the configuration of a light-emitting device according to the third modified example. [Modes for carrying out the invention]

[0009] A light-emitting device according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the embodiments shown below are illustrative of a light-emitting device that embodies the technical concept of this embodiment and are not limited thereto. Furthermore, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention to those described, unless otherwise specified, but are merely illustrative examples. Note that the size, positional relationships, etc. of the members shown in each drawing may be exaggerated for clarity of explanation. Also, in the following description, the same name and reference numerals indicate the same or similar members, and detailed explanations will be omitted as appropriate. In some cases, end view diagrams showing only the cut surface will be used as cross-sectional views.

[0010] In the following diagrams, directions may be indicated by the X, Y, and Z axes. The X direction along the X axis indicates a predetermined direction within the plane containing the light-emitting surface of the light-emitting part of the light-emitting device according to the embodiment, the Y direction along the Y axis indicates a direction perpendicular to the X direction within the above plane, and the Z direction along the Z axis indicates a direction perpendicular to the above plane.

[0011] Furthermore, the direction in which the arrow points in the X direction is denoted as the +X direction or +X side, and the opposite direction of the +X direction is denoted as the -X direction or -X side. Similarly, the direction in which the arrow points in the Y direction is denoted as the +Y direction or +Y side, and the opposite direction of the +Y direction is denoted as the -Y direction or -Y side. In addition, the direction in which the arrow points in the Z direction is denoted as the +Z direction or +Z side, and the opposite direction of the +Z direction is denoted as the -Z direction or -Z side. In this embodiment, the light-emitting part of the light-emitting device is assumed to emit light in the +Z direction as an example. Also, in the terminology of this embodiment, "plan view" means viewing the object from the Z direction. However, these do not restrict the orientation of the light-emitting device when it is in use, and the orientation of the light-emitting device is arbitrary.

[0012] The light-emitting device according to this embodiment includes a light-emitting section having a light-emitting surface, a total reflection section that reflects incident light from the light-emitting section, and a Fresnel lens section into which the light reflected by the total reflection section is incident. It also includes a light-guiding member that guides the incident light, and a movement mechanism that moves the light-guiding member relative to the light-emitting section along a direction intersecting the central axis of the light-emitting surface. The light-emitting device can partially irradiate a desired area with light from its own irradiable area, and the partially irradiated area can be changed by relative movement by the movement mechanism. Here, the Fresnel lens section refers to a part in which a convex or concave lens shape is divided into concentric circular regions and the cross-section has a sawtooth shape.

[0013] Figure 1 illustrates partial irradiation of light by the light-emitting device 100 according to the embodiment. In Figure 1, the light-emitting device 100 irradiates light to a partially irradiated area 210 of the irradiable area 200, and does not irradiate light to areas other than the partially irradiated area 210.

[0014] Even when the light-emitting device 100 itself is stationary and does not move, the relative movement of the above-mentioned movement mechanism allows the area to be partially illuminated with light to move in the direction of arrow 220, for example, changing from the partially illuminated area 210 to the partially illuminated area 210a.

[0015] The irradiable area 200 refers to the area to which the light-emitting device 100 can irradiate light when the light-emitting device 100 is stationary, that is, the area to which the partial irradiation area 210 can be changed by the relative movement of the moving mechanism. Partial irradiation refers to partially irradiating light to a part of the irradiable area 200.

[0016] In Figure 1, the irradiable area 200 is illustrated as a roughly rectangular region, and the partially irradiated area 210 is illustrated as a roughly circular region, but the design is not limited to these. A roughly circular or elliptical region can be used as the irradiable area 200, and a roughly rectangular or elliptical region can be used as the partially irradiated area 210.

[0017] Figures 2 to 4 illustrate usage scenarios for the light-emitting device 100, with Figure 2 showing the first example, Figure 3 the second example, and Figure 4 the third example. Figures 2 to 4 show usage scenarios in which the light-emitting device 100 is mounted on a camera or video camera and the light emitted from the light-emitting device 100 is used as illumination for filming.

[0018] Figures 2 through 4 all show how to photograph a person in dark surroundings, such as at night. In Figure 2, a shopping street is used as the background; in Figure 3, illuminations; and in Figure 4, a night view. By partially illuminating only the area around the person without illuminating the background, it is possible to capture the background clearly while ensuring that desired areas such as the person's face are photographed under bright conditions.

[0019] For example, if the light-emitting device 100 is mounted on a smartphone, and the camera mounted on the smartphone is used to take pictures in the usage scenarios shown in Figures 2 to 4, the device can be moved relative to the touch panel, which serves as both a display screen and an operation screen, in conjunction with the touch operation performed by the smartphone user.

[0020] The user visually confirms the position of a person in a still image or video displayed on the touch panel and performs touch operations to partially illuminate the person according to their position. For example, the light-emitting device 100 moves the partially illuminated light according to the trajectory traced by the user's finger on the touch panel, thereby changing the partially illuminated area 210.

[0021] The partial illumination light continues to illuminate continuously without interruption even while moving. This allows the user to view the captured still image or video in real time while shooting, making it possible to capture a clear background while reliably capturing desired areas such as a person's face under bright conditions with simple operation.

[0022] However, the use of the light-emitting device 100 is not limited to the camera photography described above, but can be used for any purpose that involves illuminating with light. Furthermore, the equipment or device on which the light-emitting device 100 is mounted is not limited to cameras or smartphones, but can also be mounted on various lighting equipment, automobiles, and the like.

[0023] The configuration and functions of the light-emitting device 100 will be described in more detail below.

[0024] (Example of overall structure) Figure 5 is a cross-sectional view showing an example of the configuration of the light-emitting device 100 according to the embodiment. Figure 6A is a plan view of the light-emitting device 100 as seen from the light guide member 11 side, with the housing 51 and transparent member 54 omitted. Figure 7 is a plan view of the light guide member 11 as seen from the light-emitting section 1 side. Note that Figure 5 is a cross-sectional view of the light-emitting device 100 shown in Figure 6A along the DD cutting line.

[0025] As shown in Figures 5 to 7, the light-emitting device 100 includes a light-emitting unit 1, a light guide member 11, and a moving mechanism 70.

[0026] The light-emitting unit 1 is formed in a substantially rectangular shape in plan view and is mounted on the +Z side of the light-emitting unit mounting substrate 41. There only needs to be at least one light-emitting unit 1, but for example, there may be multiple light-emitting units 1. Figure 6B is a cross-sectional view showing an example of the configuration of a light-emitting device 100 having multiple light-emitting units 1. Figure 6C is a plan view of the light-emitting device 100 of Figure 6B, with the housing 51 and transparent member 54 omitted, as seen from the light guide member 11 side. Note that Figure 6B is a cross-sectional view of the light-emitting device 100 shown in Figure 6C along the EE cutting line.

[0027] As shown in Figures 6B and 6C, the multiple light-emitting units 1 consist of nine light-emitting units 1, namely 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, and 1I, arranged vertically, horizontally, or in a grid pattern in a plan view. Each light-emitting unit 1A includes a light-emitting surface 1Aa, 1B includes a light-emitting surface 1Ba, 1C includes a light-emitting surface 1Ca, 1D includes a light-emitting surface 1Da, and 1E includes a light-emitting surface 1Ea. Each light-emitting unit 1F includes a light-emitting surface 1Fa, 1G includes a light-emitting surface 1Ga, 1H includes a light-emitting surface 1Ha, and 1I includes a light-emitting surface 1Ia. It is preferable that all light-emitting surfaces 1Aa, 1Ba, 1Ca, 1D, 1E, 1F, 1G, 1H, and 1I are arranged so that, in a plan view, they are inside the total reflection section 23 (more specifically, inside the lowest part 16 of the frame-shaped light guide member 11 in a plan view). From the viewpoint of the light emission characteristics of the light-emitting device 100, it is preferable that the spacing between the light-emitting sections is narrower.

[0028] As will be described later, a single light-emitting unit 1 may have multiple light-emitting surfaces 1a in a plan view. By providing multiple light-emitting units 1 or multiple light-emitting surfaces 1a, the light intensity of the light-emitting device 100 can be increased. Also, when the light-emitting device 100 has multiple light-emitting units 1 or multiple light-emitting surfaces 1a, the multiple light-emitting units 1 or multiple light-emitting surfaces 1a (more specifically, the light-emitting elements 2 corresponding to each of the multiple light-emitting surfaces 1a) may be controlled to light up independently.

[0029] Figures 6B and 6C illustrate nine light-emitting units 1 arranged vertically, horizontally, or in a grid pattern. However, the arrangement and number of light-emitting units 1 are not limited to these and can be changed as appropriate.

[0030] The light-emitting unit mounting substrate 41 is a plate-shaped member with a substantially rectangular shape in plan view, and is a substrate equipped with wiring on which light-emitting elements and various electrical elements can be mounted. A housing 51 is provided on the light-emitting unit mounting substrate 41, and a transparent member 54 is placed in the opening 52 of the housing 51. In plan view, the transparent member 54 overlaps with the light-emitting unit 1 and the light-guiding member 11.

[0031] The light-emitting unit 1 has a light-emitting surface 1a and emits light toward the light guide member 11 provided on the +Z side of the light-emitting unit 1. The light-emitting surface 1a refers to the main light extraction surface of the light-emitting unit 1. An LED (Light Emitting Diode) or the like can be used in the light-emitting unit 1. The light emitted by the light-emitting unit 1 is preferably white light, but it may also be monochromatic light. By selecting the light-emitting unit 1 according to the intended use of the light-emitting device 100, the light emitted by the light-emitting unit 1 can be appropriately selected.

[0032] The light guide member 11 guides and emits incident light from the light-emitting part 1. The light guide member 11 is a member formed with a first incident part 12, a second incident part 13, a third incident part 14, a total reflection part 23, and a Fresnel lens part 31. The light guide member 11 has light transmittance to the light emitted by the light-emitting part 1 and includes at least one of a resin material such as polycarbonate resin, acrylic resin, silicone resin, epoxy resin, or glass material. Here, light transmittance refers to the property of being able to transmit 60% or more of the light from the light-emitting part 1.

[0033] The light guide member 11 is formed in a substantially circular shape when viewed from above. The first incident section 12, the second incident section 13, the third incident section 14, and the total reflection section 23 are each formed on the side into which light from the light-emitting section 1 is incident. The first incident section 12 has a substantially rectangular shape when viewed from above, and the second incident section 13, the third incident section 14, and the total reflection section 23 each have a substantially rectangular frame shape when viewed from above. The substantially rectangular frame shape when viewed from above is an example of a frame-shaped shape when viewed from above. Here, "frame-shaped" refers to a state that encloses something. In addition, the plan view shape of the first incident section 12 may be substantially circular, and the plan view shapes of the second incident section 13, the third incident section 14, and the total reflection section 23 each may be ring-shaped. Here, "ring-shaped" refers to a state that resembles a ring.

[0034] The Fresnel lens portion 31 is formed on the side opposite to the side from which light guided by the light guide member 11 is emitted, that is, the side from which light from the light-emitting portion 1 is incident, and its shape in plan view is approximately circular.

[0035] However, the overall planar shape of the light guide member 11 is not limited to a roughly circular shape, but may be roughly rectangular, roughly triangular, roughly elliptical, or roughly polygonal, etc. When the light-emitting device 100 is used as a flash light source for a camera, considering that the shooting range of a typical camera is roughly rectangular, the planar shape of the light guide member 11 is preferably a four-fold rotationally symmetric shape or a two-fold rotationally symmetric shape.

[0036] Light entering the light guide member 11 through the first incident section 12 or the second incident section 13 is focused by being guided through the inside of the light guide member 11 toward the Fresnel lens section 31. Light entering the light guide member 11 through the third incident section 14 is guided through the inside of the light guide member 11 and reaches the total reflection section 23, where it is reflected. The light reflected by the total reflection section 23 is focused by being guided through the inside of the light guide member 11 toward the Fresnel lens section 31. The first incident section 12, the second incident section 13, the third incident section 14 and the total reflection section 23 function, for example, as a TIR (Total Internal Reflection) lens that focuses light emitted by the light-emitting section 1. A TIR lens is an example of a light guide member 11 that includes a total reflection section 23 that totally reflects light. Note that the light guide member 11 does not necessarily have to have the second incident section 13, but including the second incident section 13 allows for more efficient extraction of light from the light-emitting section 1.

[0037] Preferably, the first incident portion 12 is formed in a convex shape toward the light-emitting portion 1, and convex corner portions 15 are formed around the first incident portion 12 in a substantially rectangular frame shape.

[0038] The corners 15 are preferably arranged continuously or intermittently in a substantially rectangular frame shape around the first incident portion 12. In this embodiment, the corners 15 are formed in a substantially rectangular frame shape around one circumference, but they may be formed to make up multiple circumferences. By providing the corners 15, the radius of the first incident portion 12 can be reduced, so that more incident light from the light-emitting portion 1 can be taken in, and the light-gathering performance is improved. In this embodiment, a third incident portion 14 having curvature in the radial direction is exemplified.

[0039] Each of the first incident section 12, the second incident section 13, and the third incident section 14 is formed inside the totally reflective section 23, which is provided in a substantially rectangular frame shape, and has a curved surface that focuses the incident light from the light-emitting section 1. Preferably, the radii of curvature of the curved surfaces of the first incident section 12, the second incident section 13, and the third incident section 14 are all different. That is, it is preferable that the light guide member 11 has multiple curved surfaces with different radii of curvature.

[0040] In this embodiment, a total reflection section 23 having radial curvature is exemplified. Regardless of whether the total reflection section 23 and the third incident section 14 have radial curvature, the shape formed by the total reflection section 23 and the third incident section 14 may be tapered, for example, so that the cross-sectional area perpendicular to the central axis 11c of the light guide member 11 is smaller on the light-emitting section 1 side than on the Fresnel lens section 31 side. The radius of curvature of the total reflection section 23 in the radial direction or the inclination angle of the inclined surface of the total reflection section 23 with respect to the central axis 11c of the light guide member 11 can be appropriately set within a range in which incident light from the light-emitting section 1 can be reflected. If the shapes of the first incident section 12, the second incident section 13, the third incident section 14 and the total reflection section 23 are determined so that as much of the light incident on the total reflection section 23 as possible satisfies the total reflection condition, the efficiency of extracting light emitted by the light-emitting section 1 will be further improved.

[0041] Since the total reflection section 23 is located outside the third incident section 14, the light guide member 11 can collect the light emitted from the light-emitting section 1 that is emitted at a wide angle (hereinafter simply referred to as wide angle) with respect to the central axis 1c of the light-emitting surface 1a, thereby improving the efficiency of extracting light emitted from the light-emitting section 1.

[0042] In this embodiment, the area of ​​the region inside the outer edge 231 of the total reflection portion 23 is larger than the area of ​​the light-emitting surface 1a of the light-emitting portion 1. With this configuration, when the light-emitting portion 1 faces the first incident portion 12 provided in the center of the light-guiding member 11, the light incident on the light-guiding member 11 is suppressed from reaching the total reflection portion 23, thereby suppressing the spread of light.

[0043] The Fresnel lens portion 31 transmits the light emitted from the light guide member 11 that has been guided through the interior of the light guide member 11. The Fresnel lens portion 31 is formed such that the curved surface of the lens is divided into substantially concentric circular regions and can be folded within a desired thickness. The Fresnel lens portion 31 has a sawtooth cross-sectional shape and, in plan view, has a substantially concentric circular shape that is symmetrical around the central axis of the Fresnel lens portion 31. In this embodiment, the Fresnel lens portion 31 is formed on the bottom surface of a recess 32 formed on the +Z side surface of the light guide member 11.

[0044] The Fresnel lens portion 31 produces desired optical properties, such as light distribution characteristics, by refracting or diffracting the light passing through it, according to its shape. The optical properties of the Fresnel lens portion 31 can be appropriately set by determining the width or height of the circles in the substantially concentric shape.

[0045] The moving mechanism 70 is an electromagnetic actuator installed on the +Z side surface of the light-emitting unit mounting substrate 41, and supports the light guide member 11 so that it can move in the XY plane. The XY plane is a plane substantially parallel to the +Z side surface of the light-emitting unit mounting substrate 41. The moving mechanism 70 includes a frame portion 71, a north pole magnet 72, a south pole magnet 73, a base portion 74, a spring 75, and a coil 76.

[0046] The frame portion 71 is a member that is substantially rectangular in shape when viewed from above. The frame portion 71 supports the light guide member 11 by placing the light guide member 11 on its inside and bonding the outer edge portion 25 of the light guide member 11 to the inner surface of the frame portion 71 with an adhesive member 61.

[0047] The frame portion 71 is made up of a resin material or a metal material, etc. Preferably, the frame portion 71 is made up of a colored material, such as black, that can absorb the light emitted by the light-emitting portion 1, either on its surface or inside. With this configuration, the frame portion 71 can absorb the light that leaks to the frame portion 71 side through the outer edge 25 and total reflection portion 23 of the light guide member 11, thereby suppressing the return of reflected light from the frame portion 71 to the light guide member 11 side. As a result, ghost light or flare light associated with the return light can be reduced, and the contrast of the light emitted by the light-emitting device 100 can be increased.

[0048] The contrast of the irradiated light refers to the difference in brightness between the partially irradiated area and the area outside the partially irradiated area, within the area that can be irradiated by the light-emitting device 100. High contrast means that the difference in brightness between the partially irradiated area and the area outside the partially irradiated area is large.

[0049] The north pole magnet 72 and south pole magnet 73 are rectangular prism-shaped members made of a metal material or the like. The north pole magnet 72 is magnetized to the north pole, and the south pole magnet 73 is magnetized to the south pole. The north pole magnet 72 and south pole magnet 73 form pairs, and four pairs of north pole magnets 72 and south pole magnets 73 are fixed inside each side of the frame portion 71 by adhesive members or the like. The north pole magnet 72 is a collective term for four north pole magnets, and the south pole magnet 73 is a collective term for four south pole magnets.

[0050] The base portion 74 is a component that has a substantially rectangular frame shape in plan view. The base portion 74 is fixed on the +Z side surface of the light-emitting unit mounting substrate 41 such that the light guide member 11 is positioned on the inside. The base portion 74 movably supports the frame portion 71 on the +Z side surface. A wall portion 74a is provided on the outer portion of the base portion 74, that is, the portion opposite to the side facing the light guide member 11 (hereinafter simply referred to as the outer portion).

[0051] The spring 75 is an elastic member that can expand and contract along the direction toward the center of the light guide member 11. There are no particular restrictions on the material of the spring 75; metal or resin materials can be used. The spring 75 includes four springs, and each spring is positioned to surround the light guide member 11 at a position that is axially symmetric with respect to the central axis 11c of the light guide member 11 when the central axis 11c of the light guide member 11 and the central axis of the light-emitting surface 1a of the light-emitting part 1 substantially coincide. In other words, each spring is positioned to surround the light guide member 11 at a position that is point-symmetric with respect to the center of the transparent member 54 in a plan view. The spring 75 is a collective term for the four springs.

[0052] One end of the spring 75 is connected to the outer surface of the frame portion 71, and the other end is connected to the wall portion 74a of the base portion 74. The frame portion 71 is movable on the mounting surface of the base portion 74 together with the light guide member 11. The spring 75 restricts the movement of the frame portion 71 to prevent it from moving too far, and also provides a restoring force to the frame portion 71 to return it to its initial position.

[0053] The coil 76 is a component capable of conducting electric current and is constructed by winding wire or the like in a spiral or vortex shape. The coil 76 includes four coils, and coil 76 is a collective designation for the four coils. The four coils are paired with each set of four N-pole magnets 72 and S-pole magnets 73. Each of the four coils is positioned on the opposite side of each set of four N-pole magnets 72 and S-pole magnets 73, separated by a wall 74a and a spring 75, and is fixed on the +Z side surface of the light-emitting unit mounting substrate 41.

[0054] For example, when a current i is passed through the coil 76 from an external drive circuit, as shown in Figure 6A, an electromagnetic force 76a is generated in the direction toward the light guide member 11, according to Fleming's left-hand rule, due to the action of the north pole magnet 72, the south pole magnet 73, and the coil 76. The white arrow representing the electromagnetic force 76a indicates the direction in which the electromagnetic force 76a acts. The frame portion 71 is pushed by the electromagnetic force 76a, causing the frame portion 71 to move in the direction of the push.

[0055] The magnitude of the electromagnetic force 76a changes according to the amount of current flowing through the coil 76, and the amount of movement of the frame 71 changes. Also, the direction of the electromagnetic force 76a changes according to the direction of the current flowing through the coil 76, and the direction of movement of the frame 71 changes. For example, if the current flows in the opposite direction to the direction of current i shown in Figure 6A, an electromagnetic force is generated in the opposite direction to the direction indicated by the white arrow of the electromagnetic force 76a. At this time, the frame 71 moves in the direction in which it is attracted by the generated electromagnetic force 76a.

[0056] The moving mechanism 70 generates electromagnetic force in each pair of coils 76 and N-pole magnets 72 and S-pole magnets 73, according to the amount and direction of current flowing through each of the four coils 76. The moving mechanism 70 moves the light guide member 11 relative to the light-emitting part 1 along a direction intersecting the central axis 1c of the light-emitting surface 1a using the generated electromagnetic force. In other words, the moving mechanism 70 can move the light guide member 11 relative to the light-emitting part 1 in an XY plane intersecting the +Z direction. The direction intersecting the central axis 1c of the light-emitting surface 1a is, for example, a direction perpendicular or approximately perpendicular to the central axis 1c of the light-emitting surface 1a. Approximately perpendicular means that a deviation from orthogonality that is generally considered an error is permissible in relative movement. Similarly, the XY plane intersecting the +Z direction is an XY plane that is perpendicular or approximately perpendicular to the +Z direction.

[0057] The moving mechanism 70 can move the light guide member 11 relative to the light-emitting part 1 such that the light-emitting surface 1a of the light-emitting part 1 is located inside the totally reflective part 23, which is formed in a roughly rectangular frame shape when viewed from above.

[0058] By moving the light guide member 11 relative to the light-emitting unit 1 while the light-emitting unit 1 is emitting light, the light-emitting device 100 can continuously change the direction of the partially illuminated light.

[0059] In this embodiment, an electromagnetic actuator is used as an example of the moving mechanism 70, but the drive method of the moving mechanism 70 is not limited to this, and other drive methods such as piezoelectric actuators or ultrasonic actuators can also be used.

[0060] The housing 51 is a box-shaped member with a substantially rectangular shape in plan view, capable of housing the light-emitting unit 1, the light guide member 11, and the moving mechanism 70, etc., inside. The housing 51 may be a part of the housing of a smartphone or the like on which the light-emitting device 100 is mounted. The housing 51 has an opening 52 and a holding part 53.

[0061] The opening 52 is formed in a substantially circular shape when viewed from above. Preferably, the opening 52 is formed larger than the Fresnel lens portion 31 of the light guide member 11 so that the Fresnel lens portion 31 is exposed. The -Z side surface of the holding portion 53 is fixed to the +Z side surface of the light-emitting portion mounting substrate 41 by an adhesive member or the like.

[0062] The housing 51 is preferably made of a light-shielding material, and is preferably made of a resin material containing fillers such as light-reflecting members and light-absorbing members so as to limit the direction of light distribution of the light emitted from the light-emitting device 100.

[0063] The transparent member 54 contains at least a resin material or glass material that is light-transmitting to the light emitted by the light-emitting part 1, and is a plate-shaped member with a substantially circular shape in plan view. The transparent member 54 is positioned on the +Z side of the light guide member 11 and is supported in a state where it fits into the opening 52 of the housing 51. The transparent member 54 may be bonded to the housing 51 with an adhesive member or the like.

[0064] The transparent member 54 transmits light emitted from the light guide member 11 through the Fresnel lens portion 31. The light that has been emitted from the light guide member 11 and then transmitted through the transparent member 54 becomes the illumination light from the light-emitting device 100.

[0065] By housing the light-emitting unit 1, light guide member 11, and moving mechanism 70, etc., inside the space surrounded by the light-emitting unit mounting substrate 41, housing 51, and transparent member 54, it is possible to prevent foreign matter such as dust and dirt from adhering to the light-emitting unit 1, light guide member 11, and moving mechanism 70, etc., or from being struck by foreign matter.

[0066] The shapes of the housing 51 and the transparent member 54 are not limited to those described above. A housing with a substantially circular, elliptical, or polygonal shape in plan view may be used, or a transparent member with a substantially rectangular, elliptical, or polygonal shape in plan view may be used.

[0067] (Example of configuration of light-emitting unit 1) Figure 8 is a cross-sectional view showing an example of the configuration of the light-emitting unit 1. Figure 9A is a cross-sectional view showing another example of the configuration of the light-emitting unit 1, as the light-emitting unit 1'. As shown in Figures 8 and 9A, the light-emitting unit 1 and the light-emitting unit 1' are placed on the +Z side of the light-emitting unit mounting substrate 41, with the +Z side being the light-emitting surface 1a and the side opposite to the light-emitting surface 1a being the mounting surface.

[0068] The light-emitting unit 1 includes a light-emitting element 2, a translucent member 4 provided on the +Z side of the light-emitting element 2, and a covering member 5 that covers the side surface of the light-emitting element 2 and the side surface of the translucent member 4, except for the +Z side surface of the translucent member 4. Note that, as shown in Figure 9A, the side surface of the translucent member 4 may be exposed from the covering member 5.

[0069] Preferably, at least one pair of positive and negative electrodes 3 are provided on the surface of the light-emitting element 2 opposite to the light-emitting surface 1a. In this embodiment, the shape of the light-emitting part 1 in plan view is substantially rectangular, but it may also be a polygonal shape such as substantially circular, substantially elliptical, substantially triangular, or substantially hexagonal.

[0070] The light-emitting element 2 is preferably made of various semiconductors such as III-V compound semiconductors and II-VI compound semiconductors. X Al Y Ga 1-X-Y It is preferable to use nitride-based semiconductors such as N(0≦X, 0≦Y, X+Y≦1), and InN, AlN, GaN, InGaN, AlGaN, InGaAlN, etc. can also be used.

[0071] The light-transmitting member 4 is a plate-shaped member with a substantially rectangular shape in plan view, and is provided to cover the upper surface of the light-emitting element 2. The light-transmitting member 4 can be formed using a light-transmitting resin material or an inorganic material such as ceramics or glass. As the resin material, thermosetting resins such as silicone resin, silicone-modified resin, epoxy resin, and phenolic resin can be used. In particular, silicone resin or a modified resin thereof, which has excellent light resistance and heat resistance, is preferred. Here, light transmittance means that it is preferable to transmit 60% or more of the light from the light-emitting element 2.

[0072] In addition, as the light-transmitting member 4, thermoplastic resins such as polycarbonate resin, acrylic resin, methylpentene resin, and polynorbornene resin can be used.

[0073] Furthermore, the light-transmitting member 4 may be composed of the above resin and a wavelength conversion member that wavelength-converts at least a part of the light from the light diffusion member or the light-emitting element 2. Examples of the light-transmitting member 4 composed of a resin and a wavelength conversion member include those in which a wavelength conversion member is contained in a resin material, ceramics, glass, etc., and sintered bodies of the wavelength conversion member. In addition, the light-transmitting member 4 may be one in which a resin layer containing a wavelength conversion member or a light diffusion member is formed on the -Z side surface of a molded body of resin, ceramics, glass, etc.

[0074] In the light-emitting device according to the embodiment, a blue light-emitting element is used as the light-emitting element 2, and the light-transmitting member 4 includes a wavelength conversion member that wavelength-converts the light emitted from the light-emitting element 2 to yellow, thereby emitting white light.

[0075] Examples of the wavelength conversion member included in the light-transmitting member 4 include, for example, yttrium aluminum garnet-based phosphors (for example, Y3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet-based phosphors (for example, Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet-based phosphors (for example, Tb3(Al,Ga)5O 12 :Ce), CCA-based phosphors (for example, Ca 10 (PO4)6Cl2:Eu), SAE-based phosphors (for example, Sr4Al 14 O 25 :Eu), chlorosilicate-based phosphors (for example, Ca8MgSi4O 16 Cl2:Eu), nitride-based phosphors, fluoride-based phosphors, phosphors having a perovskite structure (for example, CsPb(F,Cl,Br,I)3), quantum dot phosphors (for example, CdSe, InP, AgInS2 or AgInSe2), etc. can be used. Examples of nitride-based phosphors are β-sialon-based phosphors (for example, (Si,Al)3(O,N)4:Eu), α-sialon-based phosphors (for example, Ca(Si,Al)12 (O,N) 16 :Eu), SLA-based phosphors (e.g., SrLiAl3N4:Eu), CASN-based phosphors (e.g., CaAlSiN3:Eu), and SCASN-based phosphors (e.g., (Sr,Ca)AlSiN3:Eu), etc. Examples of fluoride-based phosphors are KSF-based phosphors (e.g., K2SiF6:Mn), KSAF-based phosphors (e.g., K2(Si,Al)F6:Mn), and MGF-based phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), etc. The above phosphors are particles. Also, one of these wavelength conversion members can be used alone, or two or more of these wavelength conversion members can be combined and used.

[0076] The KSAF-based phosphor may have a composition represented by the following formula (I).

[0077] M2[Si p Al q Mn r F s (I)

[0078] 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, K2[Si 0.946 Al 0.005 Mn 0.049 F 5.995 , K2[Si 0.942 Al 0.008 Mn 0.050 F 5.992 , K2[Si 0.939 Al 0.014 Mn 0.047 F 5.986Compositions represented by [ ] are examples. With such KSAF-based phosphors, it is possible to obtain red emission with high brightness and a narrow full width at half maximum of the emission peak wavelength.

[0079] Examples of light-diffusing materials that can be included in the light-transmitting member 4 include titanium oxide, barium titanate, aluminum oxide, and silicon oxide.

[0080] The covering member 5 is a member that covers the sides of the light-emitting element 2 and the light-transmitting member 4, and directly or indirectly covers the sides of the light-emitting element 2 and the light-transmitting member 4. The upper surface of the light-transmitting member 4 is exposed from the covering member 5 and constitutes the light-emitting surface 1a of the light-emitting unit 1.

[0081] The covering member 5 is preferably made of a material with high light reflectivity in order to improve light extraction efficiency. For example, the covering member 5 can be made of a resin material containing a light-reflective substance such as a white pigment.

[0082] Examples of light-reflecting materials include titanium dioxide, zinc oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, aluminum oxide, zirconium oxide, silicon oxide, etc. It is preferable to use one of these alone or two or more of these in combination.

[0083] Furthermore, it is preferable to use a resin material mainly composed of thermosetting resins such as epoxy resin, silicone resin, silicone-modified resin, and phenolic resin as the base material. The covering member 5 may also be made of a material that is translucent to visible light, if necessary.

[0084] The light-emitting unit mounting substrate 41 is preferably configured to include wiring 42 arranged on at least one of its surface or interior. In the light-emitting unit mounting substrate 41, the light-emitting unit mounting substrate 41 and the light-emitting unit 1 are electrically connected by connecting the wiring 42 and at least one pair of positive and negative electrodes 3 of the light-emitting unit 1 via a conductive adhesive member 62. The configuration and size of the wiring 42 on the light-emitting unit mounting substrate 41 are set according to the configuration and size of the electrodes 3 of the light-emitting unit 1.

[0085] The light-emitting unit mounting substrate 41 is preferably made of an insulating material, preferably a material that does not easily transmit light emitted from the light-emitting unit 1 or ambient light, and preferably a material that has a certain degree of strength. Specifically, the light-emitting unit mounting substrate 41 can be made of ceramics such as alumina, aluminum nitride, or mullite, or resins such as phenolic resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), or polyphthalamide.

[0086] The wiring 42 can be made of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, or alloys thereof. In addition, a layer of silver, platinum, aluminum, rhodium, gold, or alloys thereof may be provided on the surface of the wiring 42 from the viewpoint of wettability and / or light reflectivity of the conductive adhesive member 62.

[0087] As described above, a single light-emitting unit 1 may have multiple light-emitting surfaces 1a in a plan view. Figure 9B is a plan view showing an example of the configuration of a light-emitting unit 1 having multiple light-emitting surfaces 1a as seen from the light guide member 11 side. As shown in Figure 9B, the light-emitting unit 1 has nine light-emitting surfaces 1a arranged vertically and horizontally, or in a grid pattern, in a plan view. Each of the nine light-emitting surfaces 1a includes a light-emitting element 2, a light-transmitting member 4 provided on the +Z side of the light-emitting element 2, and a covering member 5 that covers the side surface of the light-emitting element 2 and the side surface of the light-transmitting member 4, except for the +Z side surface of the light-transmitting member 4. Note that, similar to the light-emitting unit 1' shown in Figure 9A, there may be a portion of the side surface of the light-transmitting member 4 on the light-emitting surface 1a that is not covered by the covering member 5. In other words, in this case, adjacent light-emitting elements 2 will have a common light-transmitting member 4. Each of the multiple light-emitting surfaces 1a, and more specifically the light-emitting elements 2 corresponding to each of the multiple light-emitting surfaces 1a, can be independently controlled to light up. Furthermore, while Figure 9B illustrates nine light-emitting surfaces 1a arranged vertically, horizontally, or in a grid pattern, the arrangement and number of light-emitting surfaces 1a are not limited to these and can be changed as appropriate.

[0088] (Examples of changes in the optical path and illuminance distribution of the irradiated light due to relative movement) Referring to Figures 10 to 17, the changes in the optical path and illuminance distribution of the irradiated light due to the movement of the light guide member 11 by the moving mechanism 70 will be explained.

[0089] Figure 10 is a cross-sectional view showing an example of the optical path of the light-emitting device 100 when the light guide member 11 is not moving, and shows the housing 51 and transparent member 54 omitted. The plan view of the light-emitting device 100 in this state is the same as in Figure 6A.

[0090] In the state of the light-emitting device 100 shown in Figure 10, no current flows through the coil 76, the frame portion 71 is stationary in its initial position together with the light guide member 11, and the central axis 1c of the light-emitting surface 1a and the central axis 11c of the light guide member 11 are approximately coincident.

[0091] Light L emitted from the light-emitting section 1 is guided through the first incident section 12 and the second incident section 13, respectively, and focused inside the light-guiding member 11. It then passes through the Fresnel lens section 31 and exits from inside the light-guiding member 11 to the outside. At this time, most of the light L does not pass through the third incident section 14 and does not reach the total reflection section 23. The central axis Le of the light emitted from the Fresnel lens section 31 substantially coincides with the central axis 1c of the light-emitting surface 1a and the central axis 11c of the light-guiding member 11.

[0092] Figure 11 is a schematic diagram showing an example of the illuminance distribution of the light emitted by the light-emitting device 100 in Figure 10. As shown in Figure 11, the partially illuminated area 210 due to the emitted light is located near the center of the irradiable area 200. The size of the irradiable area 200 and the ratio of the size of the irradiable area 200 to the partially illuminated area 210 can be appropriately set by determining the shape of the first incident part 12, the second incident part 13 and the Fresnel lens part 31 in the light guide member 11, as well as the distance between the light guide member 11 and the light-emitting part 1.

[0093] Figure 12 is a diagram showing an example of the positional relationship between the light guide member 11 and the light-emitting unit 1 in the light-emitting device 100 when the light guide member 11 is moved to one side, i.e., to the -X side. It is a plan view from the light guide member 11 side, with the housing 51 and transparent member 54 omitted. Figure 13 is a cross-sectional view showing an example of the optical path of the light-emitting device 100 in Figure 12.

[0094] In the state of the light-emitting device 100 shown in Figures 12 and 13, a current i flows from the outside to the inside (hereinafter referred to as the forward direction) in the coil located on the +X side of the four coils 76, generating an electromagnetic force 76a toward the -X side. The frame portion 71 is pushed toward the -X side by the electromagnetic force 76a together with the light-guiding member 11 and moves, so that the central axis 11c of the light-emitting surface 1a is shifted toward the -X side relative to the central axis 1c of the light-emitting surface 1a.

[0095] Furthermore, when the light guide member 11 is moved to the -X side, the coils among the four coils 76 that are located on the +Y side, -Y side, and -X side 76No current flows through it. However, current may be passed through the coil located on the -X side from the inside outwards (hereinafter referred to as the reverse direction). This allows for a greater increase in the electromagnetic force 76a compared to the case where current is passed only through the coil located on the +X side.

[0096] Light L emitted from the light-emitting unit 1 is guided through the interior of the light guide member 11 by passing through the first incident section 12, the second incident section 13, and the third incident section 14, and is then focused. Light L that has passed through the first incident section 12 and the second incident section 13 exits the light guide member 11 from the inside to the outside by passing through the Fresnel lens section 31. On the other hand, light L that has passed through the third incident section 14 is reflected by the total reflection section 23 and then exits the light guide member 11 from the inside to the outside by passing through the Fresnel lens section 31. The central axis Le of the emitted light is tilted at an angle θ1 with respect to the central axis 11c of the light guide member 11, according to the difference between the central axis 11c of the light guide member 11 and the central axis 1c of the light-emitting surface 1a. In this embodiment, even when the light guide member 11 moves relative to the light-emitting unit 1, the central axis 11c of the light guide member 11 remains substantially parallel to the central axis 1c of the light-emitting surface 1a.

[0097] The relationship between the amount of current i and the amount of movement of the light guide member 11 can be appropriately set by determining the number of turns of the coil 76, the magnetic force of the N-pole magnet 72 and the S-pole magnet 73, etc. Also, the angle θ1 of the central axis Le of the light emitted from the light guide member 11, corresponding to the amount of movement of the light guide member 11, can be appropriately set by determining the shape of the first incident part 12, the second incident part 13 and the Fresnel lens part 31 of the light guide member 11, the distance between the light guide member 11 and the light-emitting part 1, etc.

[0098] Figure 14 is a schematic diagram showing an example of the illuminance distribution of the light emitted by the light-emitting device 100 in Figure 12. As shown in Figure 14, the partial illumination area 210 due to the emitted light is positioned at a location offset from the center of the irradiable area 200 according to the angle θ1.

[0099] Next, Figure 15 is a diagram showing an example of the positional relationship between the light guide member 11 and the light-emitting unit 1 in the light-emitting device 100 when the light guide member 11 is moved to the other side, i.e., to the +X side. It is a plan view from the light guide member 11 side, with the housing 51 and transparent member 54 omitted. Figure 16 is a cross-sectional view showing an example of the optical path of the light-emitting device 100 in Figure 15.

[0100] In the state of the light-emitting device 100 shown in Figures 15 and 16, a current i flows in the forward direction through the coil located on the -X side among the four coils 76, generating an electromagnetic force 76b toward the +X side. As the frame portion 71 is pushed toward the +X side by the electromagnetic force 76b together with the light guide member 11, the central axis 11c of the light guide member 11 is shifted toward the +X side relative to the central axis 1c of the light-emitting surface 1a.

[0101] Furthermore, when the light guide member 11 is moved to the +X side, the coils located on the +Y side, -Y side, and +X side out of the four coils 76 76 No current flows through it. However, current may be passed in the reverse direction through the coil located on the +X side. This allows for a greater increase in the electromagnetic force 76b compared to the case where current is passed only through the coil located on the -X side.

[0102] Light L emitted from the light-emitting section 1 is guided through the interior of the light-guiding member 11 by passing through the first incident section 12, the second incident section 13, and the third incident section 14, and is then focused. The light L that has passed through the first incident section 12 and the second incident section 13 exits the light-guiding member 11 from the inside to the outside by passing through the Fresnel lens section 31. On the other hand, the light L that has passed through the third incident section 14 is reflected by the total reflection section 23 and then exits the light-guiding member 11 from the inside to the outside by passing through the Fresnel lens section 31. The central axis Le of the emitted light is tilted at an angle θ2 with respect to the central axis 11c of the light-guiding member 11, according to the difference between the central axis 11c of the light-guiding member 11 and the central axis 1c of the light-emitting surface 1a.

[0103] Figure 17 is a schematic diagram showing an example of the illuminance distribution of the light emitted by the light-emitting device 100 in Figure 15. As shown in Figure 17, the partial illumination area 210 due to the emitted light is positioned at a location offset from the center of the irradiable area 200 according to the angle θ2.

[0104] Figures 10 to 17 show a configuration in which the light-emitting device 100 has one light-emitting section 1 (in other words, one light-emitting surface 1a), and the moving mechanism 70 moves the light guide member 11 relative to the light-emitting section 1 while the one light-emitting section 1 is emitting light. If the light-emitting device 100 has multiple light-emitting surfaces 1a, the moving mechanism 70 should move the light guide member 11 relative to the multiple light-emitting surfaces 1a or multiple light-emitting sections 1 so that at least one of the multiple light-emitting surfaces 1a that is emitting light is inside the total reflection section 23 in a plan view (more specifically, inside the lowest part 16 of the frame-shaped light guide member 11 in a plan view).

[0105] (Function of Fresnel lens section 31) Figures 18 to 21 illustrate the operation of the Fresnel lens section 31. Figure 18 is a cross-sectional view showing the optical path of a light-emitting device 100W according to another embodiment, and Figure 19 is a schematic diagram showing the illuminance distribution of the irradiated light in the light-emitting device 100W of Figure 18. Figure 20 is a cross-sectional view showing an example of the optical path of the light-emitting device 100 according to the embodiment, and Figure 21 is a schematic diagram showing an example of the illuminance distribution of the irradiated light in the light-emitting device 100 of Figure 20.

[0106] As shown in Figure 18, the light-emitting device 100W has a light guide member 11W that does not have a Fresnel lens on the emission side. Figure 18 shows an arrangement in which the central axis 11cW of the light guide member 11W is shifted to the +X side with respect to the central axis 1acW of the light-emitting surface 1aW in order to irradiate partial illumination light from the light-emitting device 100W in a direction tilted to the +X side.

[0107] Light incident from the light-emitting section 1W into the outer region within the light guide member 11W (in other words, the third incident section 14W) is reflected by the total reflection section 23W, then passes through the emission plane 24W and is emitted from the light guide member 11W to the outside in a direction tilted towards the +X side, reaching the partial illumination region 210W in the irradiable region 200W, as shown in Figure 19.

[0108] On the other hand, light incident from the light-emitting section 1W into the inner region within the light guide member 11W (in other words, the first incident section 12W and the second incident section 13W) passes through the exit plane 24W in a substantially parallel state without passing through the total reflection section 23W, and is emitted from the light guide member 11W to the outside, reaching the central region 211W in the irradiable region 200W, as shown in Figure 19.

[0109] On the other hand, Figure 20 shows an arrangement in which the central axis 11c of the light guide member 11 is shifted to the +X side with respect to the central axis 1ac of the light-emitting surface 1a in order to tilt the partially illuminated light from the light-emitting device 100 to the +X side.

[0110] Light entering the outer region (in other words, the third incident region 14) inside the light guide member 11 from the light-emitting section 1 is reflected by the total reflection section 23, then enters the Fresnel lens section 31, and is emitted outwards from the light guide member 11 in a direction tilted to the +X side due to the refraction or diffraction action of the Fresnel lens section 31. Then, as shown in Figure 21, it reaches the partially illuminated region 210 in the irradiable region 200.

[0111] On the other hand, light incident from the light-emitting section 1 into the inner region of the light guide member 11 (in other words, the first incident section 12 and the second incident section 13) enters the Fresnel lens section 31 in a substantially parallel state without passing through the total reflection section 23, and is emitted out from the light guide member 11 in a direction tilted to the +X side due to the refraction or diffraction action of the Fresnel lens section 31. Then, as shown in Figure 21, it reaches the partially illuminated region 210 in the irradiable region 200.

[0112] In the light-emitting device 100W, by moving the light guide member 11W relative to the light-emitting unit 1W, light incident from the light-emitting unit 1W into the outer region within the light guide member 11W is focused by the total reflection unit 23W, allowing for partial illumination of the target area within the irradiable area 200W. Furthermore, in the light-emitting device 100, the light incident from the light-emitting unit 1 into the inner region within the light guide member 11 can be tilted by the refraction or diffraction action of the Fresnel lens unit 31, thereby suppressing the light reaching the central region 211 in the irradiable area 200, and allowing for appropriate partial illumination of only the desired area within the irradiable area 200.

[0113] For example, if the shape of the Fresnel lens portion 31 is determined so that the refractive power (power) for light incident from the light-emitting portion 1 into the inner region of the light-guiding member 11 is greater, the light reaching the central region 211 in the irradiable region 200 can be further suppressed. As a result, it becomes possible to more appropriately partially irradiate only the desired region in the irradiable region 200, which is preferable. By using the Fresnel lens portion 31, the light-guiding member 11 does not become thicker even if the refractive power is increased, thus avoiding an increase in the size of the light-emitting device 100.

[0114] (Examples of optical paths and illuminance distributions for each type of light passing through different regions of the light guide member 11) Figures 22 to 36 show the optical paths and illuminance distributions for light passing through different regions of the light guide member 11. Specifically, the different regions of the light guide member 11 refer to three regions: region A, region B, and region C. Region A is the region through which light incident on the light guide member 11 passes through the first incident section 12 and the second incident section 13, respectively. Region B is the region through which light that has been incident on the light guide member 11 through the third incident section 14 and then exits without passing through the total reflection section 23 passes. Region C is the region through which light that has been incident on the light guide member 11 through the third incident section 14 and then exits via the total reflection section 23 passes.

[0115] Figures 22 to 26 show the state in which the light guide member 11 is not moving as a first example. Figure 22 is a diagram showing the optical path of the light-emitting device 100, Figure 23 is a schematic diagram of the illuminance distribution due to light passing through region A, Figure 24 is a schematic diagram of the illuminance distribution due to light passing through region B, Figure 25 is a schematic diagram of the illuminance distribution due to light passing through region C, and Figure 26 is a schematic diagram of the illuminance distribution obtained by combining the illuminance distributions of Figures 23 to 25.

[0116] Figures 27 to 31 show a second example of the state in which the light guide member 11 is moving in the X or Y direction in a plan view, i.e., in the lateral direction. Figure 27 is a diagram showing the optical path of the light-emitting device 100, Figure 28 is a schematic diagram of the illuminance distribution due to light passing through region A, Figure 29 is a schematic diagram of the illuminance distribution due to light passing through region B, Figure 30 is a schematic diagram of the illuminance distribution due to light passing through region C, and Figure 31 is a schematic diagram of the illuminance distribution obtained by combining the illuminance distributions of Figures 28 to 30.

[0117] Figures 32 to 36 show a third example of the state in which the light guide member 11 is moving in the diagonal direction in a plan view, that is, in the corner direction of the frame portion 71. Figure 32 is a diagram showing the optical path of the light-emitting device 100, Figure 33 is a schematic diagram of the illuminance distribution due to light passing through region A, Figure 34 is a schematic diagram of the illuminance distribution due to light passing through region B, Figure 35 is a schematic diagram of the illuminance distribution due to light passing through region C, and Figure 36 is a diagram. 33 diagram 35 This is a schematic diagram of the illuminance distribution obtained by combining the illuminance distributions of the individual components.

[0118] Figures 22 through 36 all show the simulation results. In the optical path diagrams shown in Figures 22, 27, and 32, light La passing through region A is shown with a solid arrow, light Lb passing through region B is shown with a dashed arrow, and light Lc passing through region C is shown with a dashed arrow.

[0119] As shown in Figures 27 to 36, when the light guide member 11 is moving in the lateral direction and in the corner direction of the frame portion 71, light passing through any of the A, B, and C regions can selectively illuminate the desired partial illumination region 210 in the lateral direction and in the corner direction of the frame portion 71 within the irradiable area 200. Also, as shown in Figures 22 to 26, when the light guide member 11 is not moving, the amount of light passing through the A region increases, but even in this case, the desired partial illumination region 210 in the center direction can be selectively illuminated.

[0120] (Example of the positional relationship between the light guide member 11 and the light-emitting part 1 in the height direction) Figures 37 to 40 illustrate the positional relationship between the light guide member 11 and the light-emitting unit 1 in the height direction. Note that the height direction corresponds to the Z direction.

[0121] Figure 37 shows the first example state in which the lowest part 16 of the light guide member 11 is on the +Z side of the light-emitting part 1. Here, the lowest part 16 refers to the part of the light guide member 11 that is furthest to the -Z side. Figure 38 shows the second example state in which the lowest part 16 of the light guide member 11 is on the -Z side of the light-emitting part 1. Figure 39 shows the third example state in which the light guide member 11 has moved to the +X side relative to the light-emitting part 1, and the light emitted by the light-emitting part 1 is leaking out without entering the light guide member 11. Figure 40 shows the fourth example state in which the light guide member 11 has moved to the +X side relative to the light-emitting part 1, and the light emitted by the light-emitting part 1 is not leaking out without entering the light guide member 11.

[0122] The shortest distance h shown in Figures 37 to 40 represents the shortest distance along the direction approximately perpendicular to the light-emitting surface 1a between the light-emitting surface 1a of the light-emitting unit 1 and the light-guiding member 11. In other words, the shortest distance h is the distance between the light-emitting surface 1a and the lowest part 16.

[0123] In this embodiment, the shortest distance h is preferably 0.0 [mm] or more and 1.0 [mm] or less. However, the shortest distance h includes not only the distance between the light-emitting surface 1a and the lowest part 16 of the light-guiding member 11 when the lowest part 16 of the light-guiding member 11 is on the +Z side of the light-emitting surface 1a (see Figure 37), but also the distance between the light-emitting surface 1a and the lowest part 16 of the light-guiding member 11 when the lowest part 16 of the light-guiding member 11 is on the -Z side of the light-emitting surface 1a when the light-emitting surface 1a is not in contact with the light-guiding member 11 (see Figure 38).

[0124] This configuration allows the light-emitting device 100 to be made thinner. Furthermore, when the light-emitting section 1 faces the first incident section 12 located in the center of the light guide member 11, most of the incident light to the light guide member 11 does not reach the total reflection section 23. This suppresses the spread of light, allowing the light-emitting device 100 to more accurately partially illuminate a desired area of ​​the irradiable region 200.

[0125] On the other hand, as shown in Figure 39, when the light guide member 11 is moved to the +X side relative to the light-emitting unit 1, depending on the shortest distance h, there is a concern that the wide-angle light L1 emitted by the light-emitting unit 1 will leak out without entering the light guide member 11.

[0126] Therefore, it is more preferable that the shortest distance h is 0.0 mm or more and 0.4 mm or less. With this configuration, as shown in Figure 40, even when the light guide member 11 is moved to the +X side relative to the light-emitting unit 1, the light L1 emitted at a wide angle can be incident on the light guide member 11. As a result, the light-emitting device 100 can be miniaturized, and the decrease in light utilization efficiency due to light emitted by the light-emitting unit 1 leaking out from the light guide member 11 can be suppressed.

[0127] (Examples) Next, we will describe the optical simulation performed using the model of the light-emitting device of the embodiment. Note that the light-emitting device according to the embodiment is not limited to the following embodiment.

[0128] Using the model of the light-emitting device 100 of the embodiment, the illuminance distribution when the light-emitting unit 1 is lit was determined by simulation under the following conditions.

[0129] [Simulation conditions] Size of the light-emitting surface of light-emitting part 1: 0.7 [mm] x 0.7 [mm] Dimensions of the evaluation receiver: 429 mm x 572 mm Distance between light-emitting device and evaluation receiver: 300.0 [mm] Field of view of the evaluation receiver: 100 degrees The shortest distance between the light-emitting surface 1a of the light-emitting unit 1 and the light-guiding member 11 is 0.1 mm.

[0130] Figures 41 to 43 each show the relationship between the amount of movement of the light guide member and the illuminance distribution in a light-emitting device. Figure 41 shows the first embodiment, Figure 42 shows the second embodiment, and Figure 43 shows a comparative example. The first embodiment is a light-emitting device 100 having a light guide member 11 according to the embodiment. The second embodiment is a light-emitting device having a light guide member 11' according to the embodiment. The light guide member 11' has a flat surface on the light-emitting side (opposite to the light-incident side) of the guided light, and for example, the light guide member 11W shown in Figure 18 can be applied. The comparative example is a light-emitting device having a light guide member 11'' where the incident side is a Fresnel lens and the exit side is a flat surface.

[0131] In each of Figures 41 to 43, the positional relationship P indicates the positional relationship between the light-emitting part and the light-guiding member 11 in a plan view. The amount of movement ΔX indicates the relative amount of movement in the X direction [mm], and the amount of movement ΔY indicates the relative amount of movement in the Y direction [mm]. In the examples of Figures 41 to 43, only ΔY was changed in increments of 0.2 [mm].

[0132] Furthermore, the illuminance distribution S represents the illuminance distribution of the emitted light in the light-emitting device, and the cross-sectional illuminance distribution I represents the cross-sectional illuminance distribution along the Y direction of the emitted light (X=0.0 [mm]), that is, the illuminance distribution of the emitted light in a cross section that includes the midpoints of two opposite sides of the square-shaped light-emitting surface 1a and also includes the central axis of the emitted light. In the graph showing the cross-sectional illuminance distribution I, the horizontal axis represents the beam angle from -90.0 [degrees] to +90 [degrees], and the vertical axis represents the illuminance. In all graphs from Figures 41 to 43, the vertical axis consistently shows the illuminance range, i.e., the minimum and maximum values ​​of the illuminance.

[0133] As shown in Figure 41, in the first embodiment, the position of the partially illuminated light and the beam angle at which the illuminance peaked changed in accordance with the change in the amount of movement ΔY. Furthermore, the illuminance distribution of the partially illuminated light remained almost the same even when the amount of movement ΔY changed. The peak illuminance of the partially illuminated light also remained almost the same, and a high peak was maintained, even when the amount of movement ΔY changed.

[0134] Furthermore, as shown in Figure 42, in the second embodiment, the position of the partially illuminated light and the beam angle at which the illuminance peaks changed in accordance with the change in the amount of movement ΔY.

[0135] On the other hand, as shown in Figure 43, in the comparative example, no change was observed in the position of the partially illuminated light or the beam angle at which the illuminance peaked, in response to the change in the amount of movement ΔY. The illuminance distribution and peak illuminance of the partially illuminated light were not maintained by the change in the amount of movement ΔY.

[0136] These findings confirm that while partial irradiation is difficult to perform appropriately in the comparative example, it is possible to perform partial irradiation appropriately in the first and second embodiments. Furthermore, in the first embodiment, it was confirmed that the position and beam angle of the partially irradiated light can be controlled by the relative movement amount, enabling more appropriate partial irradiation.

[0137] Here, an example of the dimensions of the light-emitting device 100 according to the embodiment will be described with reference to Figures 44A to 44C. Figure 44A is a cross-sectional view illustrating an example of the dimensions of the light-emitting device 100. Figure 44B is a partially enlarged view of region Q in Figure 44A. Figure 44C is a perspective view of the light guide member 11 as seen from the -Z direction side.

[0138] In Figure 44A, Wt represents the overall size (width) of the light guide member 11, AL represents the size of the light-emitting surface 1a in the light-emitting section 1 (length of one side of the square), and Tt represents the overall thickness of the light guide member 11.

[0139] In Figure 44B, Fp represents the pitch (distance between adjacent concentric circular outer portions) of the Fresnel lens portion 31, and FA represents the angle of the lens surface of the Fresnel lens portion 31 with respect to the X direction. The pitch and the angle of the lens surface of the Fresnel lens portion 31 with respect to the X direction can be appropriately adjusted depending on the position where each of the multiple convexities of the Fresnel lens portion 31 is provided. In1 represents the size (width) of the first incident portion 12, In2 represents the size (width) of the frame portion of the second incident portion 13, η1 represents the angle of the third incident portion 14, and η2 represents the angle of the total reflection portion 23. Note that η1 is the angle between the line connecting the two extreme points in the Z direction of the third incident portion 14 and the line along the X direction, and η2 is the angle between the line connecting the two extreme points in the Z direction of the total reflection portion 23 and the line along the X direction.

[0140] In Figure 44C, Ar1 (hatched area) represents the area of ​​the third incident portion 14, and Ar2 (dotted area) represents the area of ​​the total reflection portion 23.

[0141] Table 1 below is a list showing examples of the dimensions of the light-emitting device 100.

[0142] [Table 1]

[0143] In Table 1, "Range" indicates the range that each item can be applied to. For example, "Square with sides of 0.2 mm to 3.0 mm" shown for the size AL of the light-emitting surface 1a in the light-emitting unit 1 means "a square with sides of 0.2 mm or more and 3.0 mm or less". The meaning of "~" is the same for items other than the size AL of the light-emitting surface 1a.

[0144] As an example, by configuring the light-emitting device 100 with the dimensions shown in Table 1, the effects and benefits of the light-emitting device 100 described below can be obtained.

[0145] (Effects of the light-emitting device 100) As described above, the light-emitting device 100 according to this embodiment includes a light-emitting section 1 having a light-emitting surface 1a, a total reflection section 23 that reflects incident light from the light-emitting section 1, and a Fresnel lens section 31 into which the light reflected by the total reflection section 23 is incident, and a light-guiding member 11 that guides the incident light, and a moving mechanism 70 that moves the light-guiding member 11 relative to the light-emitting section 1 along a direction intersecting the central axis 1c of the light-emitting surface 1a.

[0146] The light guide member 11 has a total reflection section 23, which allows it to collect even wide-angle light emitted from the light-emitting section 1, and efficiently extract the light from the light-emitting section 1 to the outside. This ensures a large amount of light is emitted by the light-emitting device 100.

[0147] Furthermore, by moving the light guide member 11 relative to the light-emitting unit 1, the direction of light irradiation can be changed, allowing for partial irradiation of a desired position and direction. In addition, since the distance between the light-emitting unit 1 and the light guide member 11 can be shortened, the light-emitting device 100 capable of partially irradiating a desired area within the irradiable area 200 can be miniaturized. Moreover, since the area of ​​the light-emitting surface 1a in the light-emitting unit 1 can be made larger, the amount of light emitted by the light-emitting device 100 can be made larger.

[0148] As described above, this embodiment provides a light-emitting device 100 that can change the direction of light irradiation and efficiently extract light from the light-emitting unit 1 to the outside.

[0149] For example, if a device such as a smartphone or camera is equipped with a light-emitting device, and the user manually moves the device itself to change the partial illumination area, the shooting area also changes, making it difficult to partially illuminate a desired area, such as around a person's face, within the shooting area. In this embodiment, since only the partial illumination area 210 is changed by the movement mechanism 70 while the device is stationary, the operation to change the partial illumination area 210 can be easily performed.

[0150] Furthermore, if the partial illumination area is changed by tilting the light guide member, for example, the light-emitting device becomes thicker in proportion to the tilt of the light guide member. In this embodiment, since the light guide member 11 is moved along a direction intersecting the central axis 1c of the light-emitting surface 1a, it is possible to avoid the light-emitting device 100 becoming thicker compared to the case where the light guide member is tilted.

[0151] Furthermore, in this embodiment, it is preferable that the light guide member 11 has a Fresnel lens portion 31 on the light-emitting side of the guided light. Because the direction of the emitted light can be accurately determined by the Fresnel lens portion 31, the light-emitting device 100 can accurately partially irradiate a desired area in the irradiable area 200. In addition, because the light-emitting unit 1 is less visible from the outside due to the Fresnel lens portion 31, the aesthetic appearance of the light-emitting device 100 can be improved. However, the light guide member according to this embodiment is not limited to one having a Fresnel lens portion 31 on the light-emitting side of the guided light. The light guide member 11W (see Figure 18) or the like, on the light-emitting side of the guided light may be a flat surface, and even with this configuration, the direction of light irradiation can be changed, and the effect of efficiently extracting light from the light-emitting unit 1 to the outside can be obtained.

[0152] Furthermore, in this embodiment, it is preferable that the moving mechanism 70 moves the light guide member 11 relative to the light-emitting unit 1 while the light-emitting unit 1 is emitting light. This makes it possible to vary the area to be partially irradiated without switching the light-emitting unit 1, and thus the partially irradiated area 210 on the irradiable area 200 can be continuously changed without interruption of partial irradiation.

[0153] For example, if a light-emitting device has multiple light-emitting units and selectively emits light from some of these units to change the partial illumination area, the partial illumination is interrupted at the timing of switching the light emission of the light-emitting units, resulting in intermittent changes in the partial illumination area. When the partial illumination area changes intermittently, there is a concern that it may become difficult to change the partial illumination area, such as when the light-emitting device is installed in a smartphone or other device. In this embodiment, the partial illumination area 210 can be changed continuously, thus improving the operability of changing the partial illumination area 210. Also, when continuous shooting is required, such as in video recording, if the partial illumination area changes intermittently, the changes will also be recorded, raising concerns that the resulting image may appear unnatural. In this embodiment, such unnaturalness can be improved.

[0154] Furthermore, in this embodiment, the total reflection section 23 is provided in a substantially rectangular frame shape in plan view, and it is preferable that the moving mechanism 70 moves the light guide member 11 relative to the light-emitting section 1 such that the light-emitting surface 1a of the light-emitting section 1 is inside the total reflection section 23 in plan view. As a result, even if the light guide member 11 moves relative to the light-emitting section 1, it is possible to suppress leakage of light from the light-emitting surface 1a from the light guide member 11 and reflect it at the total reflection section 23.

[0155] Furthermore, in this embodiment, the total reflection section 23 is provided in a substantially rectangular frame shape in plan view, and the light guide member 11 has a first incident section 12, a second incident section 13, and a third incident section 14 inside the substantially rectangular frame-shaped total reflection section 23. Preferably, each of the first incident section 12, the second incident section 13, and the third incident section 14 has a curved surface that focuses the incident light from the light-emitting section 1. Due to the focusing effect of the curved surface, a desired area of ​​the irradiable region 200 by the light-emitting device 100 can be partially irradiated more accurately compared to the case where the inside of the total reflection section 23 is flat.

[0156] Furthermore, in this embodiment, it is preferable that the curved surfaces of the first incident section 12, the second incident section 13, and the third incident section 14, which are provided inside the total reflection section 23 in a plan view, are multiple curved surfaces with different radii of curvature. This configuration allows for miniaturization of the light guide member 11 while enabling more accurate partial illumination of a desired area of ​​the irradiable area 200 by the light-emitting device 100.

[0157] Furthermore, in this embodiment, the total reflection portion 23 is provided in a substantially rectangular frame shape in plan view, and it is preferable that the area of ​​the region inside the outer edge 231 of the total reflection portion 23 is larger than the light-emitting surface 1a of the light-emitting portion 1. With this configuration, when the light-emitting portion 1 faces the central region of the light-guiding member 11 (in other words, the first incident portion 12), most of the incident light to the light-guiding member 11 does not reach the total reflection portion 23, thereby suppressing the spread of light and allowing for more precise partial illumination of a desired area of ​​the irradiable region 200 by the light-emitting device 100.

[0158] Furthermore, in this embodiment, the shortest distance between the light-emitting surface 1a of the light-emitting unit 1 and the light guide member 11, along a direction perpendicular to the light-emitting surface 1a, is preferably 0.0 mm or more and 1.0 mm or less. This configuration allows the light-emitting device 100 to be made thinner. Also, when the light-emitting unit 1 faces the central region of the light guide member 11 (in other words, the first incident portion 12), most of the incident light to the light guide member 11 does not reach the total reflection portion 23, thus suppressing the spread of light and allowing the light-emitting device 100 to more accurately partially illuminate a desired area of ​​the irradiable region 200.

[0159] In this embodiment, the plan view shape of the total reflection section 23 is shown to be approximately rectangular, but the plan view shape of the total reflection section 23 may be a polygonal frame shape other than a rectangular frame, or a ring shape, and the same effects can be obtained in this case as well.

[0160] (First variation) In the above-described embodiment, the light guide member 11 is shown to be moved relative to the light-emitting part 1 along a direction intersecting the central axis 1c of the light-emitting surface 1a by the moving mechanism 70. However, the light-emitting part 1 may be moved relative to the light guide member 11.

[0161] Figure 45 is a cross-sectional view showing an example of the configuration of the light-emitting device 100a according to the first modified example. In the light-emitting device 100a, the light-emitting part 1 is movable relative to the light-guiding member 11. Figure 46 is a cross-sectional view showing the state in which the light-emitting part 1 has been moved in the light-emitting device 100a of Figure 45. The same reference numerals are used for components identical to those in the above-described embodiment, and redundant explanations are omitted as appropriate. This also applies to the modified examples shown hereafter.

[0162] As shown in Figures 45 and 46, the light-emitting device 100a has a moving mechanism 70a. The moving mechanism 70a includes a north pole magnet 72a, a south pole magnet 73a, a base portion 74aa, a spring 75a, and a coil 76aa. The north pole magnet 72a and the south pole magnet 73a are provided on or inside the surface of the light-emitting unit mounting substrate 41.

[0163] The base portion 74aa supports the light-emitting unit mounting substrate 41 so that it can move within the XY plane. Wiring 42 for inputting a drive signal to the light-emitting unit 1 is provided on the base portion 74aa. One end of the spring 75a is connected to the light-emitting unit mounting substrate 41, and the other end is connected to a part of the base portion 74aa. When current flows through the coil 76aa, an electromagnetic force is generated by the action of the north pole magnet 72a, the south pole magnet 73a, and the coil 76aa.

[0164] The moving mechanism 70a moves the light-emitting unit mounting substrate 41 in a direction substantially perpendicular to the central axis 11c of the light-guiding member 11 by the electromagnetic force it generates, thereby allowing the light-emitting unit 1 mounted on the light-emitting unit mounting substrate 41 to move relative to the light-guiding member 11. This makes it possible to change the direction of light irradiation and provides a light-emitting device 100a that efficiently extracts light from the light-emitting unit 1 to the outside. Other effects are the same as in the embodiment.

[0165] In this embodiment, the configuration for relative movement is not limited to those described above, as long as the light guide member 11 can be moved relative to the light-emitting unit 1 along a direction intersecting the central axis 11c of the light guide member 11. For example, the light guide member 11 may be moved by moving the member to which it is fixed, or the light-emitting unit 1 may be mounted or fixed by moving the member to which it is fixed.

[0166] (Second variation) Next, Figure 47 is a cross-sectional view showing an example of the configuration of a light-emitting device 100b according to a second modified example. The light-emitting device 100b has a light-guiding member 11b. The light-guiding member 11b has a first lens 33 and a second lens 34.

[0167] The first lens 33 has a first incident portion 12, a second incident portion 13, a third incident portion 14, and a total reflection portion 23. The first lens 33 has a function similar to the configuration on the side of the light guide member 11 into which light from the light-emitting portion 1 is incident. The second lens 34 includes a Fresnel lens portion having a plurality of convexities on the -Z side surface. This second lens 34 is an example of a Fresnel lens.

[0168] In other words, the light guide member 11b has a configuration in which the light-emitting part 1 on the side of the light guide member 11 that is incident on is the first lens 33, and the configuration including the Fresnel lens part 31 is the second lens 34, with each of these being provided separately.

[0169] The first lens 33 and the second lens 34 may be bonded to each other by an adhesive member or the like, or they may be formed as a single unit. Furthermore, by bonding the second lens 34 to the housing 51 with the adhesive member 63, the first lens 33 and the second lens 34 can be fixed to the housing 51.

[0170] The relative movement between the light-emitting part 1 and the light-guiding member 11b along the direction intersecting the central axis 1c of the light-emitting surface 1a may be performed by moving the light-emitting part mounting substrate 41 on which the light-emitting part 1 is mounted, or by moving the housing 51 to which the light-guiding member 11b is fixed.

[0171] With the configuration described above, it is possible to change the direction of light irradiation and provide a light-emitting device 100b that efficiently extracts light from the light-emitting unit 1 to the outside. Other effects are the same as in the embodiment.

[0172] (Third variation) Figure 48 is a cross-sectional view showing an example of the configuration of a light-emitting device 100c according to a third modified example. The light-emitting device 100c has a light guide member 11cc. The light guide member 11cc has a second lens 34c. The second lens 34c is a lens in which a Fresnel lens having a plurality of convexities is formed on the -Z side and a convex portion 35 is formed on the +Z side.

[0173] The light guide member 11cc, like the light guide member 11b, has a configuration in which the light-emitting part 1 on the side of the light guide member 11 that is incident on is designated as the first lens 33, and the configuration including the Fresnel lens part 31 is designated as the second lens 34c, with each being provided separately. This second lens 34c is an example of a Fresnel lens. The first lens 33 and the second lens 34c may be bonded to each other by an adhesive member or the like, or they may be formed as a single unit. Furthermore, by bonding the second lens 34c to the housing 51 with an adhesive member 63, the first lens 33 and the second lens 34c can be fixed to the housing 51.

[0174] The light-emitting device 100c does not have a transparent member 54, and the opening 52 of the housing 51 is sealed by the protrusion 35 formed on the second lens 34c fitting into the opening 52. Because the light-emitting device 100c does not have a transparent member 54, the cost of the light-emitting device can be reduced.

[0175] Furthermore, relative movement between the light-emitting unit 1 and the light-guiding member 11cc along the direction intersecting the central axis 1c of the light-emitting surface 1a may be performed by moving the light-emitting unit mounting substrate 41 on which the light-emitting unit 1 is mounted, or by moving the housing 51 to which the light-guiding member 11cc is fixed, in addition to the method described above.

[0176] With the configuration described above, it is possible to change the direction of light irradiation and provide a light-emitting device 100c that efficiently extracts light from the light-emitting unit 1 to the outside. Other effects are the same as in the embodiment.

[0177] Each of the configurations described above can be modified in various ways. For example, the number of corners 15 in the light guide member 11 can be increased, or the curvature of the Fresnel lens portion 31 can be changed as appropriate. In addition, the radii of curvature of the first incident portion 12, the second incident portion 13, and the third incident portion 14, or the radius of curvature or inclination angle of the total reflection portion 23 can be changed as appropriate.

[0178] Furthermore, although the above-described embodiment illustrates a so-called monocular configuration in which the light-emitting device 100 has one set of light-emitting part and light-guiding member, similar effects can be obtained even if the light-emitting device 100 has a so-called compound eye configuration in which it has multiple sets of light-emitting part and light-guiding member.

[0179] Furthermore, although the above-described embodiment illustrates a configuration in which a Fresnel lens is provided on the side from which light is emitted from the light-emitting device, similar effects can be obtained even if tubular light guide members are arranged in an array on the side from which light is emitted from the light-emitting device.

[0180] Furthermore, in the above-described embodiment, a configuration was illustrated in which the light guide member is moved relative to the light-emitting part along a direction intersecting the central axis of the light-emitting surface of the light-emitting part. However, similar effects can be obtained even if the light guide member is rotated relative to the light-emitting part around the central axis of the light-emitting surface of the light-emitting part or the central axis of the light guide member.

[0181] The light-emitting device of the present invention can irradiate a desired partial illumination area with light, making it suitable for use in lighting, camera flashes, vehicle headlights, and the like. However, the light-emitting device of the present invention is not limited to these applications. [Explanation of Symbols]

[0182] 1. Light-emitting part 1a Light-emitting surface 1c Central axis of the light-emitting surface 2 light-emitting elements 3 electrodes 4 Translucent material 5 Covering member 11, 11a, 11b, 11cc Light guide members 11c Central axis of the light guide member 12 1st entrance part 13 Second entrance part 14 Third entrance section 15 corners 16 Bottom 23 Total reflection section 231 Outer edge 25 Outer edge 31 Fresnel lens section 32 recesses 33 First Lens 34, 34c Second lens (an example of a Fresnel lens) 41 Light-emitting unit mounting substrate 42 Wiring 51 cabinets 52 Aperture 53 Holding part 54 Transparent component 61, 63 Adhesive members 62 Conductive adhesive member 70 Moving mechanism 71 Frame section 72 North pole magnets 73 S pole magnet 74 Daibu 75 springs 76 coils 100, 100a, 100b, 100c Light-emitting devices 200 irradiation area 210 Partial irradiation area i current h Shortest distance Light emitted from the light-emitting part (L) Le: The central axis of the emitted light θ1, θ2 angle

Claims

1. A light-emitting part having a light-emitting surface, A light guide member includes a total reflection section that reflects incident light from the light-emitting section, and a Fresnel lens section into which the light reflected by the total reflection section is incident, and guides the incident light. The system includes a movement mechanism that moves the central axis of the light guide member relative to the central axis of the light-emitting portion along a direction intersecting the central axis of the light-emitting surface, The aforementioned moving mechanism is a light-emitting device arranged in a plan view so as to surround the central axis of the light-guiding member.

2. The light-emitting device according to claim 1, wherein the light-guiding member has a Fresnel lens on the light-emitting side of the light guided by the light-guiding member.

3. The light-emitting device according to claim 1 or 2, wherein the moving mechanism moves the light guide member relative to the light-emitting part while the light-emitting part is emitting light.

4. The aforementioned total reflection portion is provided in a frame-like or ring-like shape in a plan view. The light-emitting device according to any one of claims 1 to 3, wherein the moving mechanism moves the light guide member relative to the light-emitting part such that the light-emitting surface of the light-emitting part is inside the total reflection part in a plan view.

5. The aforementioned total reflection portion is provided in a frame-like or ring-like shape in a plan view. The light-emitting device according to any one of claims 1 to 4, wherein the light-guiding member has a curved surface for focusing the incident light on the inside of the frame-shaped total reflection portion.

6. The light-emitting device according to claim 5, wherein the curved surface has a plurality of curved surfaces with different radii of curvature.

7. The aforementioned total reflection portion is provided in a frame-like or ring-like shape in a plan view. The light-emitting device according to any one of claims 1 to 6, characterized in that the area of ​​the region inside the outer edge of the total reflection portion is larger than the light-emitting surface of the light-emitting portion.

8. The light-emitting device according to any one of claims 1 to 7, wherein the shortest distance between the light-emitting surface of the light-emitting unit and the light-guiding member, along the direction perpendicular to the light-emitting surface, is 0.0 mm or more and 1.0 mm or less.

9. The light-emitting device according to any one of claims 1 to 8, wherein the moving mechanism is arranged in a plan view to surround the central axis of the light-emitting surface.

10. The light-emitting device according to any one of claims 1 to 9, wherein the moving mechanism is capable of rotatably rotating the light-guiding member relative to the light-emitting portion about the central axis of the light-emitting surface or the central axis of the light-guiding member.

Images