Light emitting device, lighting device, and optical member

Abstract

The present application provides a light emitting device, a lighting device, and an optical member. The light emitting device (50) has one or more first light emitting elements (11), one or more second light emitting elements (12), a first light collecting portion (22) disposed at a position corresponding to the first light emitting element (11) and condensing light incident from the first light emitting element (11), a second light collecting portion (23) disposed around the first light collecting portion (22) and condensing light emitted from the first light emitting element (11) and not incident on the first light collecting portion (22), and a first light guiding portion (24) disposed around the second light collecting portion (23) and disposed at a position corresponding to the second light emitting element (12) and internally totally reflecting light incident from the second light emitting element (12) to guide the light. The half-value angle (θ HW2 ) of light emitted from the first light guiding portion (24) is larger than the half-value angle (θ HW1 ) of light emitted from the first light collecting portion (22).

Description

[0001] This application is a divisional application of the invention patent application filed on October 31, 2019, with application number 201911050640.2 and title "Light-emitting device, illumination device and optical component". Technical Field

[0002] The implementation methods involve light-emitting devices, lighting devices, and optical components. Background Technology

[0003] In recent years, there has been a demand for lighting fixtures capable of switching beam angles. For example, it is necessary to use a lighting fixture that can increase the beam angle to illuminate the entire room under certain conditions, while decreasing the beam angle to illuminate a small area under other conditions. As a device to achieve this, a mechanical device can be considered to change the positional relationship between the light source and the optical system. However, lighting fixtures with such mechanical devices are large, costly, and require time to switch between beam angles; furthermore, they suffer from reduced aesthetic appeal. Summary of the Invention

[0004] The light-emitting device of the embodiment includes: one or more first light-emitting elements; one or more second light-emitting elements; a first light-concentrating section disposed at a position corresponding to the first light-emitting elements to concentrate light incident from the first light-emitting elements; a second light-concentrating section disposed around the first light-concentrating section to concentrate light emitted from the first light-emitting elements that is not incident on the first light-concentrating section; and a first light-guiding section disposed around the second light-concentrating section and at a position corresponding to the second light-emitting elements to guide light incident from the second light-emitting elements by total internal reflection. The half-value angle of the light emitted from the first light-guiding section is larger than the half-value angle of the light emitted from the first light-concentrating section.

[0005] In addition, other embodiments of the light-emitting device include: a first light-concentrating part, which is a convex lens; a second light-concentrating part, which is disposed around the first light-concentrating part and has an inner surface and an outer surface, the outer surface being curved outward relative to the light-emitting surface; a first light-guiding part, which is a cylindrical component that surrounds the second light-concentrating part in an annular shape; one or more first light-emitting elements, which are disposed at positions corresponding to the first light-concentrating part; and one or more second light-emitting elements, which are disposed at positions corresponding to the first light-guiding part.

[0006] The optical component of the embodiment includes: a first focusing portion that focuses light incident on a first light incident region; a second focusing portion disposed around the first focusing portion that focuses light emitted from a position opposite to the first light incident region that does not incident on the first focusing portion; and a first light guide portion disposed around the second focusing portion that guides light incident on a second light incident region by total internal reflection. The half-value angle of the light emitted from the first light guide portion is larger than the half-value angle of the light emitted from the first focusing portion.

[0007] In addition, the optical component in other embodiments includes: a first light-concentrating part; a second light-concentrating part disposed around the first light-concentrating part, having an inner surface and an outer surface, the outer surface being curved outward relative to the light-emitting surface; and a first light-guiding part, which is a cylindrical component that surrounds the second light-concentrating part in an annular shape.

[0008] The light-emitting circuit of this embodiment includes: one or more first light-emitting elements disposed in a first region, and one or more second light-emitting elements disposed in a second region surrounding the first region. The color temperature of the light emitted from the second light-emitting elements is different from the color temperature of the light emitted from the first light-emitting elements. A first circuit including the one or more first light-emitting elements and a second circuit including the one or more second light-emitting elements are connected in parallel, and the number of first light-emitting elements connected in series in the first circuit is less than the number of second light-emitting elements connected in series in the second circuit. Attached Figure Description

[0009] Figure 1 This is a cross-sectional exploded perspective view of the lighting device according to the first embodiment.

[0010] Figure 2A This is a cross-sectional view showing the lighting device according to the first embodiment.

[0011] Figure 2B This is a perspective view showing the lighting device according to the first embodiment.

[0012] Figure 3 This is a top view showing the light source section.

[0013] Figure 4A This is a cross-sectional perspective view of the optical components of the first embodiment.

[0014] Figure 4B This is a cross-sectional view showing the optical components of the first embodiment.

[0015] Figure 5A This is a top view of the optical components of the first embodiment as viewed from the direction of light incidence.

[0016] Figure 5BThis is a top view of the optical components of the first embodiment as viewed from the direction of light emission.

[0017] Figure 5C This is a perspective view showing the optical components of the first embodiment.

[0018] Figure 6 This is a diagram showing the simulation results of the trajectory of light emitted from the first light-emitting element.

[0019] Figure 7 This is a diagram showing the simulation results of the trajectory of light emitted from the second light-emitting element.

[0020] Figure 8 It is a cross-sectional view showing the relationship between the trajectory of light emitted from the radiating plate and the position of the cover component.

[0021] Figure 9 This is a diagram showing the light-emitting device according to the second embodiment.

[0022] Figure 10A This is a diagram showing the dimensions of the first light guide portion and the second light guide portion in an embodiment.

[0023] Figure 10B It is a graph showing the simulation results of the distribution of light emitted from the first light guide section of the embodiment, with the horizontal axis as the angle with the center and the vertical axis as the luminance.

[0024] Figure 10C It is a graph showing the simulation results of the distribution of light emitted from the second light guide section of the embodiment, with the horizontal axis as the angle with the center and the vertical axis as the luminance.

[0025] Figure 11 This is a top view showing the light source section of the third embodiment.

[0026] Figure 12 This is a circuit diagram showing the light-emitting circuit of the third embodiment.

[0027] Figure 13A It is a graph that uses the horizontal axis as the input current and the vertical axis as the luminous flux to represent the behavior of the first and second light-emitting elements in the third embodiment.

[0028] Figure 13B It is a graph that uses the horizontal axis as the input current and the vertical axis as the color temperature to represent the behavior of the light-emitting device in the third embodiment.

[0029] Figure 14 This is a top view showing the light source section of the fourth embodiment.

[0030] Figure 15 This is a circuit diagram showing the light-emitting circuit of the fourth embodiment.

[0031] Figure 16 It is a chromaticity coordinate graph that uses the horizontal axis as x and the vertical axis as y to represent the color changes of light emitted from a light-emitting device.

[0032] Figure 17 This is a top view showing the light source section of the fifth embodiment.

[0033] Figure 18 This is a top view showing the light source section of the sixth embodiment.

[0034] Figure 19 This is a cross-sectional view showing the optical components of the sixth embodiment. Detailed Implementation

[0035] <First Implementation>

[0036] First, the first embodiment will be described.

[0037] Figure 1 This is a cross-sectional exploded perspective view of the lighting device according to this embodiment.

[0038] Figure 2A This is a cross-sectional view showing the lighting device of this embodiment.

[0039] Figure 2B This is a perspective view showing the lighting device of this embodiment.

[0040] First, the structure of the lighting device 1 according to this embodiment will be described in general. The lighting device 1 includes: a light source unit 10, an optical component 20, a diffuser plate 30, and a cover component 40. The light source unit 10 and the optical component 20 constitute the light-emitting device 50.

[0041] The light source unit 10 has one or more first light-emitting elements 11 and one or more second light-emitting elements 12. The optical component 20 has a first focusing part 22, a second focusing part 23, and a first light guide part 24. The first focusing part 22 is disposed at a position corresponding to the first light-emitting element 11, so as to focus the light incident from the first light-emitting element 11. The second focusing part 23 is disposed around the first focusing part 22, so as to focus the light emitted from the first light-emitting element 11 that does not enter the first focusing part 22. The first light guide part 24 is disposed around the second focusing part 23 at a position corresponding to the second light-emitting element 12, so as to guide the light incident from the second light-emitting element 12 by total internal reflection. Moreover, the half-value angle of the light emitted from the first light guide part 24 is larger than the half-value angle of the light emitted from the first focusing part 22.

[0042] The diffuser plate 30 is positioned at the point where light emitted from the light source 10 and passing through the optical component 20 is incident. The cover component 40 is positioned to cover the side of the light-emitting device 50 and the diffuser plate 30. The cover component 40 is generally cylindrical in shape, and a portion of the light passing through the diffuser plate 30 is reflected on its inner surface.

[0043] The following is a detailed explanation.

[0044] Figure 3 This is a top view showing the light source section 10.

[0045] A wiring board 15 is provided in the light source section 10. Although an example of a generally circular plate shape of the wiring board 15 is illustrated, it is not limited to this. For example, the wiring board 15 has wiring in a base material formed of resin material. The first light-emitting element 11 and the second light-emitting element 12 are mounted on the mounting surface 15a of the wiring board 15.

[0046] For example, four first light-emitting elements 11 are provided and arranged near the center of the wiring substrate 15. For example, thirteen second light-emitting elements 12 are provided and arranged in a circle around the area surrounding the four first light-emitting elements 11. Although an example of four first light-emitting elements 11 and thirteen second light-emitting elements 12 has been shown here, it is not limited to this. It is sufficient that the first light-emitting elements 11 are arranged near the center of the wiring substrate 15 and the second light-emitting elements 12 are arranged surrounding the first light-emitting elements 11; the number of arranged elements is irrelevant. The first light-emitting elements 11 and the second light-emitting elements 12 are, for example, LEDs (Light Emitting Diodes). The first light-emitting elements 11 and the second light-emitting elements 12 can illuminate independently of each other.

[0047] Figure 4A This is a cross-sectional perspective view of the optical component 20 of this embodiment.

[0048] Figure 4B This is a cross-sectional view showing the optical component 20 of this embodiment.

[0049] Figure 5A This is a top view of the optical component 20 of this embodiment as viewed from the direction of light incidence.

[0050] Figure 5B This is a top view of the optical component 20 of this embodiment as viewed from the direction of light emission.

[0051] Figure 5C This is a perspective view showing the optical component 20 of this embodiment.

[0052] The optical component 20 is a transparent component integrally formed from a transparent material. The shape of the optical component 20 is approximately that of a rotating body about a central axis C, and it has a light incident surface 21 and a light emitting surface 29. The light incident surface 21 is opposite to the light source unit 10. As described later, the light incident surface 21 of the optical component 20 has irregularities, which are used to achieve optical functions. The light emitting surface 29 is a plane orthogonal to the central axis C. Hereinafter, the direction extending from the light emitting surface 29 to the light incident surface 21 within the direction of the central axis C of the optical component 20 will be referred to as the "light incident direction," and the direction from the light incident surface 21 to the light emitting surface 29 will be referred to as the "light emitting direction."

[0053] A first focusing portion 22 protruding in the light incident direction is provided at the center of the light incident surface 21. The first focusing portion 22 is disposed in the light source portion 10 at a position corresponding to the first light-emitting element 11, for example, at a position opposite to the first light-emitting element 11. The shape of the first focusing portion 22 is convex lens-shaped, for example, part of a rotating ellipsoid. The outer surface 22a of the first focusing portion 22 is a convex curved surface. The minimum radius of curvature of the outer surface 22a is 0.3 mm or more and 13 mm or less. The minimum radius of curvature of the outer surface 22a can be measured, for example, in a cross-section including the central axis C.

[0054] A second light-concentrating part 23 is provided around the first light-concentrating part 22. The second light-concentrating part 23 is shaped like a generally frustum-shaped cone with a recessed top. The second light-concentrating part 23 is opposite to the area between the first light-emitting element 11 and the second light-emitting element 12 of the light source part 10. The surface of the second light-concentrating part 23 includes an inner surface 23a, an upper surface 23b, and an outer surface 23c.

[0055] The inner surface 23a is in contact with the outer surface 22a of the first light-concentrating part 22, and is inclined as it separates from the central axis C in the direction of light incidence. The upper surface 23b is disposed around the inner surface 23a and is in contact with it. The upper surface 23b is a circular plane parallel to the light-emitting surface 29. The outer surface 23c is disposed around the upper surface 23b and is in contact with it. The outer surface 23c is inclined as it separates from the central axis C in the direction of light emission. Furthermore, the outer surface 23c is curved outward relative to the light-emitting surface 29, i.e., in the direction of light incidence. The minimum radius of curvature of the outer surface 23c is 0.6 mm or more and 28 mm or less. The minimum radius of curvature of the outer surface 23c can also be measured, for example, in a cross-section including the central axis C.

[0056] A first light guide 24 is provided around the second light-concentrating part 23. The first light guide 24 is cylindrical in shape, surrounding the second light-concentrating part 23 in an annular shape. The cross-sectional shape of the surface of the first light guide 24 perpendicular to the light emission surface 29, for example, the surface including the central axis C, is trapezoidal. The surface of the first light guide 24 includes an inner surface 24a, an upper surface 24b, and an outer surface 24c.

[0057] The inner surface 24a is in contact with the outer surface 23c of the second light-concentrating part 23, and tilts as it moves toward the light incident direction, separating from the central axis C. The boundary line 28a between the outer surface 23c of the second light-concentrating part 23 and the inner surface 24a of the first light-guiding part 24 is located closer to the light emission direction than the boundary line 28b between the outer surface 22a of the first light-concentrating part 22 and the inner surface 23a of the second light-concentrating part 23. That is, the distance between the boundary line 28a and the light emission surface 29 is shorter than the distance between the boundary line 28b and the light emission surface 29.

[0058] The upper surface 24b is disposed around the inner surface 24a and is in contact with the inner surface 24a. The upper surface 24b is a ring-shaped plane parallel to the light emitting surface 29. The upper surface 24b is disposed in the light source section 10 at a position corresponding to the second light-emitting element 12, for example, at a position opposite to the second light-emitting element 12. The upper surface 23b of the second light-concentrating section 23 and the upper surface 24b of the first light-guiding section 24 are located on the same plane. The outer surface 24c may be perpendicular to the light emitting surface 29, or it may be inclined in a direction separate from the central axis C as it faces the light emitting direction.

[0059] A flat plate 25 is provided around the first light guide portion 24. The shape of the flat plate 25 is only required to surround the first light guide portion 24, and it is preferably an annular plate. The upper surface 25a of the flat plate 25 is a plane that is parallel to the light emitting surface 29 of the optical component 20 and orthogonal to the central axis C.

[0060] The light incident surface 21 is configured at a position and angle that is directly visible from the light emission direction. That is, the outer surface 22a of the first light-concentrating part 22, the inner surface 23a, upper surface 23b, and outer surface 23c of the second light-concentrating part 23, the inner surface 24a, upper surface 24b, and outer surface 24c of the first light guide part 24, and the upper surface 25a of the plate part 25 are all opposite to the light emission surface 29. Therefore, the optical component 20 can be manufactured by injection molding or the like. For example, by injecting transparent resin into a mold with an opening on the side of the light emission surface 29 and allowing it to cure, and then removing it in the light emission direction, the optical component 20 can be formed.

[0061] The diverging plate 30 is formed of a transparent material, such as glass or resin, to diverge and transmit incident light. For example, fine irregularities may be formed on one or both surfaces of the diverging plate 30. Alternatively, a material with a different refractive index than the base material may be dispersed into the diverging plate 30. The shape of the diverging plate 30 is only required to cover the light emitting surface 29, and is preferably a circular plate. The diverging plate 30 is disposed on the side of the light emitting surface 29 of the optical component 20, for example, in contact with the light emitting surface 29.

[0062] The cover component 40 has a flange portion 41, a receiving portion 42, and a conical portion 43. The cover component 40 is formed of an opaque material, such as a white resin material, a dark resin material, or a metal material. The cover component 40 is generally a rotating body, and the central axis of the cover component 40 is generally aligned with the central axis C of the optical component 20.

[0063] The flange portion 41 is, for example, an annular plate shape. The flange portion 41 is used to fix the lighting device 1 relative to a mounting target component, such as the ceiling 100 of a room. The housing portion 42 is cylindrical in shape with an overall upper surface and an opening in the center of the bottom surface, housing the light source portion 10, the optical component 20, and the diffuser plate 30 inside. The outer periphery of the diffuser plate 30 is held and fixed by the flat plate portion 25 of the optical component 20 and the bottom surface of the housing portion 42 of the cover component 40. The conical portion 43 is truncated cone in shape, with its diameter increasing as it separates from the housing portion 42. The upper and bottom surfaces of the conical portion 43 are open, and the interior of the conical portion 43 communicates with the interior of the housing portion 42. The inner surface of the conical portion 43 diffuses light when the cover component 40 is made of a white material, and absorbs light when the cover component 40 is made of a dark material.

[0064] Next, the operation of the lighting device 1 in this embodiment will be explained.

[0065] Figure 6 This is a diagram showing the simulation results of the trajectory of light emitted from the first light-emitting element.

[0066] Figure 7 This is a diagram showing the simulation results of the trajectory of light emitted from the second light-emitting element.

[0067] Figure 8 It is a cross-sectional view showing the relationship between the trajectory of light emitted from the radiating plate and the position of the cover component.

[0068] When the first light-emitting element 11 is lit, a portion of the light emitted from the first light-emitting element 11 is incident on the outer surface 22a of the first focusing portion 22 of the optical component 20. The outer surface 22a is the first light incident region where light is incident on the first focusing portion 22. Hereinafter, the light incident on the first focusing portion 22 will be referred to as "light L1". Light L1 is focused by the first focusing portion 22, which is shaped like a convex lens, and is emitted from the light exiting surface 29. The half-value angle θ of the light L1 emitted from the first focusing portion 22 is... HW1 For example, 24°.

[0069] The remaining portion of the light emitted from the first light-emitting element 11, that is, the light emitted from the first light-emitting element 11 that did not enter the first focusing section 22, enters the inner surface 23a of the second focusing section 23. Hereinafter, the light entering the second focusing section 23 will be referred to as "light L2". Light L2 passes through the second focusing section 23, and at least a portion is totally internally reflected by the outer surface 23c, exiting from the light-emitting surface 29. Because the outer surface 23c is curved outward relative to the light-emitting surface 29, light L2 is focused by total internal reflection within the outer surface 23c.

[0070] When the second light-emitting element 12 is lit, most of the light emitted from the second light-emitting element 12 enters the upper surface 24b of the first light guide portion 24 of the optical component 20. The upper surface 24b is the second light incident area where light enters the first light guide portion 24. Hereinafter, the light entering the first light guide portion 24 is referred to as "light L3". At least a portion of light L3 undergoes repeated total internal reflection between the inner surface 24a and the outer surface 24c of the first light guide portion 24, thereby being guided and diverged inside the first light guide portion 24 and emitted from the light emitting surface 29. The half-value angle θ of the light L3 emitted from the first light guide portion 24 is... HW2 For example, 68°. The half-value angle θ of the light L3 emitted from the first light guide section 24 of the optical component 20. HW2 The half-value angle θ of the light L1 emitted from the first focusing section 22 HW1 Large. That is, θ. HW2 >θ HW1 .

[0071] Thus, in the lighting device 1, when the first light-emitting element 11 is lit, light L1 focused by the first focusing section 22 and light L2 focused by the second focusing section 23 are emitted from the lighting device 1. This results in light with a small half-value angle. On the other hand, when the second light-emitting element 12 is lit, light L3 diffused by the first light guide section 24 is emitted from the lighting device 1. This results in light with a large half-value angle. In this way, by switching the lit light-emitting element, the lighting device 1 can switch the beam angle of the emitted light and change the illumination range.

[0072] Light emitted from the light-emitting surface 29 of the optical component 20 is scattered as it passes through the diffuser plate 30. This reduces the "graininess" caused by the user's direct visibility of the first light-emitting element 11 or the second light-emitting element 12, and reduces "color inhomogeneity" and "glare" caused by the light emission angle. The light emitted from the diffuser plate 30 then enters the conical portion 43 of the cover component 40. A portion of the light emitted from the diffuser plate 30 reaches the inner surface of the conical portion 43. In particular, light traveling at an angle of 30° or less relative to the mounting surface 15a of the wiring board 15 must reach the inner surface of the conical portion 43. It should be noted that light L4 represents the trajectory of light emitted from one end of the portion exposed within the conical portion 43 of the diffuser plate 30 at an angle of 30° relative to the mounting surface 15a and passing through the central axis of the conical portion 43. The conical portion 43 is designed so that light L4 enters the inner surface of the conical portion 43. When the inner surface of the conical portion 43 is made of a white material, the light that has reached the inner surface of the conical portion 43 is diffusely reflected by the inner surface of the conical portion 43 and emitted to the outside of the lighting device 1. When the inner surface of the conical portion 43 is made of a dark material, the light that has reached the inner surface of the conical portion 43 is absorbed by the inner surface of the conical portion 43. A portion of the light emitted from the diverging plate 30 does not reach the inner surface of the conical portion 43 and is emitted directly to the outside of the lighting device 1.

[0073] Next, the effects of this embodiment will be explained.

[0074] In lighting fixture 1, no mechanical device is required; instead, the beam angle is switched solely by electronic means. This allows for miniaturization and cost reduction of lighting fixture 1. Furthermore, since there is no mechanical movement, switching is instantaneous, noiseless, and highly reliable. Moreover, because the appearance of lighting fixture 1 can be designed to conceal the beam angle switching mechanism, it enhances its aesthetic appeal when used as a ceiling light on the ceiling 100 of a room.

[0075] Furthermore, since both narrow-angle and wide-angle illumination can be implemented using a single optical component 20, the cost of the lighting device 1 can be further reduced. As described above, the cost can be further reduced simply by forming the optical component 20 using injection molding or the like. In addition, from the user's perspective, since the position and area of ​​the light-emitting area hardly change when switching between narrow-angle and wide-angle illumination, there is less discontinuity when switching between narrow-angle and wide-angle illumination.

[0076] Furthermore, in the lighting device 1, light emitted from the diffuser plate 30 traveling at an angle of 30° or less relative to the mounting surface 15a of the wiring board 15 is diffusely reflected by the inner surface of the conical portion 43 when the cover member 40 is made of white material, and absorbed by the inner surface of the conical portion 43 when the cover member 40 is made of dark material. Therefore, it is not directly emitted from the diffuser plate 30 to the outside of the lighting device 1. As a result, light emitted from the first light-emitting element 11 and the second light-emitting element 12 at a shallow angle can be prevented from directly entering the user's eyes, thus suppressing glare. In addition, in the lighting device 1, since the narrow-angle lighting lights L1 and L2 and the wide-angle lighting light L3 can be emitted from a single optical component 20, the light-emitting area can be reduced. As a result, light at angles of 30° or less can be blocked, the height of the conical portion 43 can be reduced, and the overall lighting device 1 can be made more compact.

[0077] It should be noted that the first light-emitting element 11 and the second light-emitting element 12 can also be lit simultaneously. Thus, for example, the second light-emitting element 12 can be used to illuminate the entire room, while the first light-emitting element 11 can provide brighter illumination for work areas such as tables. In this case, the color temperatures of the light emitted by the first light-emitting element 11 and the second light-emitting element 12 can be different. For example, the color temperature of the light emitted from the second light-emitting element 12 can be set to 2700K (Kelvin) to illuminate the entire room with bulb-colored light, while the color temperature of the light emitted from the first light-emitting element 11 can be set to 6500K to illuminate the table with white light.

[0078] Alternatively, narrow-angle lighting and wide-angle lighting can be switched by using sensors to detect the human body. For example, when no one is near the work area such as a table, only the second light-emitting element 12 is turned on to illuminate the entire room. When someone is in the work area, both the first light-emitting element 11 and the second light-emitting element 12 are turned on to illuminate the work area repeatedly. Or, for example, when no one is in the room, both the first light-emitting element 11 and the second light-emitting element 12 can be turned off. When someone appears at the entrance of the room, only the first light-emitting element 11 is turned on to illuminate only a local area near the entrance. When someone enters the room, both the first light-emitting element 11 and the second light-emitting element 12 are turned on to provide bright illumination to the entire room.

[0079] <Second Implementation>

[0080] Next, the second embodiment will be described.

[0081] Figure 9 This is a diagram showing the light-emitting device of this embodiment.

[0082] It should be noted that, in principle, only the differences from the first embodiment will be described in the following description. Everything else is the same as the first embodiment. The same applies to the other embodiments described later.

[0083] In addition to the structure of the light-emitting device 50 of the first embodiment, the light-emitting device 50a of this embodiment also has one or more third light-emitting elements 13 in the light source section 10a, and a second light guide section 26 and a flat plate section 27 in the optical component 20a.

[0084] For example, multiple third light-emitting elements 13 are provided, and they are arranged in a circular pattern surrounding the area on the mounting surface 15a of the wiring board 15 where the second light-emitting elements 12 are disposed. The third light-emitting element 13 is, for example, an LED. The third light-emitting element 13 can light up independently of the first light-emitting element 11 and the second light-emitting element 12.

[0085] The second light guide portion 26 is disposed on the outer side of the flat plate portion 25. The second light guide portion 26 is a transparent cylindrical component that surrounds the first light guide portion 24 in a ring shape. The second light guide portion 26 is disposed at a position corresponding to the third light-emitting element 13, for example, at a position opposite to the third light-emitting element 13.

[0086] The surface of the second light guide portion 26 includes an inner surface 26a, an upper surface 26b, and an outer surface 26c. The inner surface 26a is in contact with the upper surface 25a of the plate portion 25, for example, and is parallel to the central axis C. The upper surface 26b is disposed around the inner surface 26a and is in contact with the inner surface 26a. The upper surface 26b is an annular plane parallel to the light emitting surface 29 and is opposite to the third light-emitting element 13. The upper surface 26b is located on the same plane as the upper surface 23b of the second light-concentrating portion 23 and the upper surface 24b of the first light guide portion 24. The outer surface 26c is in contact with the upper surface 26b, for example, and is parallel to the central axis C. The cross-sectional shape of the surface of the second light guide portion 26 perpendicular to the light emitting surface 29, for example, the surface including the central axis C, is rectangular. It should be noted that the cross-sectional shape of the second light guide portion 26 can also be a trapezoid other than a rectangle.

[0087] The cone angles of the inner surface 26a and outer surface 26c of the second light guide 26, i.e., the angles with the central axis C, are smaller than the cone angles of the inner surface 24a and outer surface 24c of the first light guide 24. Therefore, the taper ratio of the second light guide 26 is smaller than that of the first light guide 24. The "taper ratio" of the light guide is the value defined by (Wout-Win) / H when the width of the end face on the light incident surface 21 side of the light guide is Win, the width of the end face on the light emitting surface 29 side is Wout, and the length along the central axis C of the light guide is H. The end face of the first light guide 24 on the light incident surface 21 side is the upper surface 24b, and the end face of the light emitting surface 29 side is the plane connecting the boundary line 28a and the upper surface 25a of the plate portion 25. The end face of the second light guide 26 on the light incident surface 21 side is the upper surface 26b, and the end face of the light emitting surface 29 side is the plane connecting the upper surface 25a of the plate portion 25 and the upper surface 27a of the plate portion 27. For example, the taper ratio of the first light guide 24 is greater than 0 and less than 0.54, and the taper ratio of the second light guide 26 is greater than 0 and less than 0.1. As a result, the half-value angle of the light emitted from the second light guide 26 is greater than the half-value angle of the light emitted from the first light guide 24.

[0088] The plate portion 27 is disposed outside the second light guide portion 26. The upper surface 27a of the plate portion 27 is an annular plane parallel to the light emission surface 29. The thickness of the plate portion 27 is approximately the same as that of the plate portion 25. The optical component 20a, which includes the second light guide portion 26 and the plate portion 27, is integrally formed of a transparent material.

[0089] Next, the operation of the lighting device in this embodiment will be explained.

[0090] When the third light-emitting element 13 is turned on, most of the light emitted from the third light-emitting element 13 is incident on the upper surface 26b of the second light guide 26. The upper surface 26b is the third light incident area where light enters the second light guide 26. At least a portion of the light incident from the upper surface 26b into the second light guide 26 undergoes repeated total internal reflection between the inner surface 26a and the outer surface 26c, propagates within the second light guide 26, and exits from the light exit surface 29. The half-value angle θ of the light emitted from the second light guide 26... HW3 The half-value angle θ of the light emitted from the first light guide section 24 HW2 Large. That is, θ. HW3 >θ HW2 >θ HW1 .

[0091] Next, the effects of this embodiment will be explained.

[0092] According to this embodiment, by illuminating the third light-emitting element 13, a larger half-value angle can be obtained compared to illuminating the first light-emitting element 11 or the second light-emitting element 12. Therefore, the beam distribution angle can be switched in three levels.

[0093] Next, the lighting device according to the embodiment will be described.

[0094] Figure 10A This is a diagram showing the dimensions of the first light guide portion 24 and the second light guide portion 26 in this embodiment.

[0095] Figure 10B It is a graph showing the simulation results of the distribution of light emitted from the first light guide section 24 in this embodiment, with the horizontal axis as the angle with the center and the vertical axis as the luminance.

[0096] Figure 10C It is a graph showing the simulation results of the distribution of light emitted from the second light guide section 26 in this embodiment, with the horizontal axis as the angle with the center and the vertical axis as the luminance.

[0097] For example, when the width Win of the end of the first light guide 24 on the light incident direction side is 3mm, the width Wout of the end on the light emitting direction side is 6mm, and the length H of the first light guide 24 in the light emitting direction is 10.9mm, the half-value angle θ HW2 The angle is 68°. On the other hand, when the width Win of the end portion of the second light guide 26 on the light incident direction side is 3mm, the width Wout of the end portion on the light emitting direction side is 3mm, and the length H of the second light guide 26 in the light emitting direction is 10.9mm, the half-value angle θ... HW3 The half-value angle θ of the light L1 emitted from the first focusing section 22 is 112°. As described above, the half-value angle θ of the light L1 emitted from the first focusing section 22 is... HW1 For example, it is 24°. The above values ​​are summarized in Table 1 below.

[0098] [Table 1]

[0099] Light-emitting element First light-emitting element 11 Second light-emitting element 12 Third light-emitting element 13 Passing through part First Focusing Light Section 22 First light guide section 24 Second light guide section 26 Half-value angle (°) 24 68 112

[0100] <Third Implementation Method>

[0101] Next, the third embodiment will be described.

[0102] Figure 11 This is a top view showing the light source section of this embodiment.

[0103] Figure 12 This is a circuit diagram showing the light-emitting circuit of this embodiment.

[0104] The light source section 10b of the light-emitting device 50b in this embodiment includes a light-emitting circuit 81. The light-emitting circuit 81 includes one or more first light-emitting elements 11 disposed in a first region 51, and one or more second light-emitting elements 12 disposed in a second region 52. The second region 52 is disposed around the first region 51. The color temperature of the light emitted from the second light-emitting element 12 is different from the color temperature of the light emitted from the first light-emitting element 11. In the light-emitting circuit 81, a first circuit 61 containing one or more first light-emitting elements 11 and a second circuit 62 containing one or more second light-emitting elements 12 are connected in parallel. The number of series-connected first light-emitting elements 11 in the first circuit 61 is less than the number of series-connected second light-emitting elements 12 in the second circuit 62.

[0105] For example, four first light-emitting elements 11 are arranged in a first region 51 near the center of the wiring substrate 15. For example, the first region 51 includes the center of the wiring substrate 15. For example, seven second light-emitting elements 12 are arranged in a circular pattern in a second region 52 surrounding the first region 51. The first light-emitting elements 11 and the second light-emitting elements 12 are, for example, LEDs.

[0106] The first light-emitting element 11, for example, emits light with a color temperature of 2000K (Kelvin). For example, four first light-emitting elements 11, together with, for example, five resistive elements 71-75, are connected in series via wiring on the wiring board 15 to form a first circuit 61. Figure 12 In the example shown, in the first circuit 61, the resistors 71, 72, 73, 74, 75, and 72 are connected in series from the positive to the negative terminal. That is, in the first circuit 61, there are a total of four first light-emitting elements 11, and the number of series-connected first light-emitting elements 11 is also four. The anode of each first light-emitting element 11 is connected to the positive terminal, and the cathode is connected to the negative terminal.

[0107] The second light-emitting element 12, for example, emits light with a color temperature of 3000K. The second light-emitting elements 12 are connected in series via wiring on the wiring board 15 to form a second circuit 62. Figure 12 In the example shown, in the second circuit 62, from the positive terminal side to the negative terminal side, for example, seven second light-emitting elements 12 are connected in series without being connected by a resistive element. That is, in the second circuit 62, the total number of second light-emitting elements 12 is seven, and the number of series-connected second light-emitting elements 12 is also seven. The anode of each second light-emitting element 12 is connected to the positive terminal side, and the cathode is connected to the negative terminal side.

[0108] In the light-emitting circuit 81, the positive terminal of the first circuit 61 is connected to the positive terminal of the second circuit 62, and the negative terminal of the first circuit 61 is connected to the negative terminal of the second circuit 62. Thus, the first circuit 61 and the second circuit 62 are connected in parallel between their positive and negative terminals. It should be noted that... Figure 11 and Figure 12 The example shown illustrates a scenario where the number of first light-emitting elements 11 is four and the number of second light-emitting elements 12 is seven, but it is not limited to this. It is permissible as long as the first light-emitting elements 11 are arranged in the first region 51, the second light-emitting elements 12 are arranged in the second region 52 surrounding the first region 51, and the number of series-connected stages of the first light-emitting elements 11 in the first circuit 61 is less than the number of series-connected stages of the second light-emitting elements 12 in the second circuit 62.

[0109] Next, the operation of the lighting device in this embodiment will be explained.

[0110] First, the operation of the light-emitting circuit 81 will be explained.

[0111] Figure 13A It is a graph that uses the horizontal axis as the input current and the vertical axis as the luminous flux to represent the behavior of the first light-emitting element and the second light-emitting element in this embodiment.

[0112] Figure 13B It is a graph that uses the horizontal axis as the input current and the vertical axis as the color temperature to represent the behavior of the light-emitting device in this embodiment.

[0113] As described above, in the light-emitting circuit 81, the number of stages of the first light-emitting elements 11 connected in series in the first circuit 61 is less than the number of stages of the second light-emitting elements 12 connected in series in the second circuit 62. Therefore, when the DC current applied to the light-emitting circuit 81 is continuously increased from 0, the first light-emitting elements 11 conduct first because the voltage initially applied between the anode and cathode of each first light-emitting element 11 is higher than the voltage applied between the anode and cathode of each second light-emitting element 12. Therefore, current flows only in the first circuit 61, and almost no current flows in the second circuit 62. Thus, only the first light-emitting elements 11 emit light, emitting light with a color temperature of 2000K. Then, as the input current increases, the luminous flux of the first light-emitting elements 11 increases, before the input current value reaches approximately the saturation value I1 of the current flowing in the first light-emitting elements 11.

[0114] When the DC current applied to the light-emitting circuit 81 is increased, current also begins to flow in the second light-emitting element 12. As a result, the second light-emitting element 12 also emits light. The current value at which the second light-emitting element 12 begins to emit light is I2. Within the range of current value above 0 and below I2, the color temperature of the light remains constant at 2000K, depending on the input current; only the luminous flux changes. The current value I2 is preferably below I1. When the current value is above I2, the light emitted from the light source section 10b is a mixture of the light emitted from the first light-emitting element 11 and the light emitted from the second light-emitting element 12, with a color temperature between 2000K and 3000K. Then, before the input current value reaches the saturation value I3 for the current flowing in the second light-emitting element 12, the more the input current value increases, the more the luminous flux of the first light-emitting element 11 remains approximately constant, while the luminous flux of the second light-emitting element 12 increases. Furthermore, because the ratio of the luminous flux of the first light-emitting element 11 to the luminous flux of the second light-emitting element 12 changes, the color temperature of the light emitted from the light source section 10b also changes. Therefore, within the current range of I2 to I3, the larger the input current, the greater the luminous flux, and the color temperature of the light increases from 2000K, converging towards a specified value between 2000K and 3000K. When the current reaches I3, the resistance values ​​of resistors 71 to 75 are adjusted so that the anode-cathode voltage of each first light-emitting element 11 is equal to the anode-cathode voltage of each second light-emitting element 12.

[0115] Thus, in the light-emitting device 50b of this embodiment, when the first light-emitting element 11 is illuminated, light is emitted from the first region 51, with light L1 focused by the first focusing section 22 and light L2 focused by the second focusing section 23 emanating from the light-emitting device 50b. This results in light with a small half-value angle. On the other hand, when the second light-emitting element 12 is illuminated, light is emitted from the second region 52, with light L3 diffused by the first light guide section 24 emanating from the light-emitting device 50b. This results in light with a large half-value angle. Thus, by adjusting the input current value, the light-emitting device 50b can change the luminous flux of each light-emitting element, thereby controlling the color temperature and beam angle of the emitted light.

[0116] <Fourth Implementation>

[0117] Next, the fourth embodiment will be described.

[0118] Figure 14 This is a top view showing the light source section of this embodiment.

[0119] Figure 15 This is a circuit diagram showing the light-emitting circuit of this embodiment.

[0120] In the light-emitting device 50c of this embodiment, in the light source section 10c, one or more first light-emitting elements 11 are provided in the first region 51, and one or more first light-emitting elements 11, second light-emitting elements 12, third light-emitting elements 13, and fourth light-emitting elements 14 are provided in the second region 52. That is, the first light-emitting elements 11 are provided in both the first region 51 and the second region 52, while the second light-emitting elements 12, third light-emitting elements 13, and fourth light-emitting elements 14 are provided only in the second region 52. It should be noted that in Figure 14 In the accompanying drawings, to simplify the illustrations, the number of light-emitting elements is shown less than the actual number. Figure 15 In the example shown, the total number of the first light-emitting elements 11, the total number of the second light-emitting elements 12, the total number of the third light-emitting elements 13, and the total number of the fourth light-emitting elements 14 are all twelve.

[0121] In this embodiment, for example, the color temperature of the light emitted from the first light-emitting element 11 is 2700K, the color temperature of the light emitted from the second light-emitting element 12 is 2000K, the color temperature of the light emitted from the third light-emitting element 13 is 3500K, and the color temperature of the light emitted from the fourth light-emitting element 14 is 6500K. It should be noted that the color temperature of the light emitted from each light-emitting element is not limited to the examples described above; the color temperatures of the light emitted from the first light-emitting element 11, the second light-emitting element 12, the third light-emitting element 13, and the fourth light-emitting element 14 only need to be different from each other.

[0122] A light-emitting circuit 82 is provided in the light source section 10c. The light-emitting circuit 82 includes the first to fourth light-emitting elements, a plurality of first resistive elements 76, and a plurality of second resistive elements 77. The light-emitting circuit 82 is provided with a first circuit 61, a second circuit 62, a third circuit 63, and a fourth circuit 64. In the light-emitting circuit 82, the first circuit 61 and the second circuit 62 are connected in parallel, and the third circuit 63 and the fourth circuit 64 are connected in parallel.

[0123] In the first circuit 61, for example, there are four unit circuits formed by three first light-emitting elements 11 connected in parallel, and these four unit circuits are connected in series with a plurality of first resistive elements 76. Therefore, in the first circuit 61, the total number of first light-emitting elements 11 is twelve, and the number of series-connected first light-emitting elements 11 is four. It should be noted that the resistance values ​​of the plurality of first resistive elements 76 can be the same or different.

[0124] In the second circuit 62, for example, twelve second light-emitting elements 12 are connected in series without being connected by resistive elements. Therefore, in the second circuit 62, the total number of second light-emitting elements 12 is twelve, and the number of series-connected second light-emitting elements 12 is also twelve.

[0125] In the third circuit 63, for example, there are four unit circuits formed by three third light-emitting elements 13 connected in parallel, and these four unit circuits are connected in series with a plurality of second resistive elements 77. Therefore, in the third circuit 63, the total number of third light-emitting elements 13 is twelve, and the number of series-connected third light-emitting elements 13 is four. It should be noted that the resistance values ​​of the plurality of second resistive elements 77 can be the same or different.

[0126] In the fourth circuit 64, for example, twelve fourth light-emitting elements 14 are connected in series without the aid of resistors. Therefore, in the fourth circuit 64, the total number of fourth light-emitting elements 14 is twelve, and the number of series-connected fourth light-emitting elements 14 is twelve.

[0127] Next, the operation of this embodiment will be explained.

[0128] Because the first light-emitting element 11 is disposed on both the first region 51 and the second region 52, the light emitted from the first light-emitting element 11 is emitted from the first light-concentrating part 22, the second light-concentrating part 23, and the first light-guiding part 24 of the optical component 20. Because the second light-emitting element 12, the third light-emitting element 13, and the fourth light-emitting element 14 are disposed only on the second region 52, the light emitted from the second light-emitting element 12, the third light-emitting element 13, and the fourth light-emitting element 14 is emitted from the first light-guiding part 24.

[0129] The first circuit 61 and the second circuit 62 are connected to the same power supply and are subjected to the same voltage. Therefore, as explained in the first embodiment, when the input current value gradually increases from 0, the first light-emitting element 11 begins to emit light first, and near the point where the current flowing in the first light-emitting element 11 reaches saturation, the second light-emitting element 12 begins to emit light. As a result, when the input current value changes, the overall color temperature, luminous flux, and beam angle change according to a predetermined relationship.

[0130] The third circuit 63 and the fourth circuit 64 are connected to the same power supply and are subjected to the same voltage. Therefore, as the input current gradually increases from 0, the third light-emitting element 13 begins to emit light first, and near the point where the current flowing in the third light-emitting element 13 reaches saturation, the fourth light-emitting element 14 begins to emit light. As a result, when the input current changes, the overall color temperature and luminous flux change according to a predetermined relationship.

[0131] Furthermore, by controlling the ratio of the current values ​​flowing in the first circuit 61 and the second circuit 62 to the current values ​​flowing in the third circuit 63 and the fourth circuit 64, the proportion of light emitted from the first light-emitting element 11, the second light-emitting element 12, the third light-emitting element 13, and the fourth light-emitting element 14 can be controlled. By optimizing this control, the color of the light emitted from the light-emitting device 50c can be made to change along the blackbody radiation.

[0132] Figure 16 It is a chromaticity coordinate graph with the horizontal axis as x and the vertical axis as y, representing the color change of light emitted from the light-emitting device.

[0133] Depend on Figure 16 The curve shown by the dashed line represents the theoretical curve of the color change of blackbody radiation, the curve shown by the solid line represents the simulation result of the color change of the light emitted by the light-emitting device of this embodiment, and the straight line shown by the dotted line represents the color change of the light emitted by the light-emitting device using only two light-emitting elements.

[0134] like Figure 16 As shown, according to this embodiment, the light emitted from the light-emitting device 2 can be made to change along the blackbody radiation.

[0135] Next, the effects of this embodiment will be explained.

[0136] According to this embodiment, because four light-emitting elements with different color temperatures are provided, the color temperature adjustment range is wider compared to the third embodiment. Furthermore, because the first circuit 61 containing the first light-emitting element 11 and the second circuit 62 containing the second light-emitting element 12 are connected in parallel, the number of stages of the first light-emitting element 11 connected in series in the first circuit 61 is less than the number of stages of the second light-emitting element 12 connected in series in the second circuit 62. Therefore, it is possible to smoothly and continuously transition from a state where only the first light-emitting element 11 emits light to a state where both the first light-emitting element 11 and the second light-emitting element 12 emit light. Similarly, because the third circuit 63 containing the third light-emitting element 13 and the fourth circuit 64 containing the fourth light-emitting element 14 are connected in parallel, the number of stages of the third light-emitting element 13 connected in series in the third circuit 63 is less than the number of stages of the fourth light-emitting element 14 connected in series in the fourth circuit 64. Therefore, it is possible to smoothly and continuously transition from a state where only the third light-emitting element 13 emits light to a state where both the third light-emitting element 13 and the fourth light-emitting element 14 emit light.

[0137] Furthermore, by appropriately controlling the current flowing in the parallel circuit of the first circuit 61 and the second circuit 62, and the current flowing in the parallel circuit of the third circuit 63 and the fourth circuit 64, the transition from a state where only the first light-emitting element 11 emits light to a state where all light-emitting elements emit light can be smoothly and continuously achieved. This allows for continuous changes in color temperature, luminous flux, and beam angle, suppressing user discomfort during dimming. Additionally, the color of the light can change along blackbody radiation. This enables more natural dimming, providing peace of mind for the user.

[0138] <Fifth Implementation>

[0139] Next, the fifth embodiment will be described.

[0140] Figure 17 This is a top view showing the light source section of this embodiment.

[0141] The light-emitting circuit of this embodiment and Figure 15 The light-emitting circuit 82 shown is the same.

[0142] In the light-emitting device 50d of this embodiment, in the light source section 10d, a first light-emitting element 11 and a second light-emitting element 12 are provided in the first region 51. The first light-emitting element 11, the second light-emitting element 12, the third light-emitting element 13, and the fourth light-emitting element 14 are provided in the second region 52. It should be noted that... Figure 17 In the accompanying drawings, to simplify the illustrations, the number of light-emitting elements is shown less than the actual number. The following description... Figure 18 and Figure 19 It's the same.

[0143] According to this embodiment, compared to the second embodiment, the light emitted from the first focusing section 22 and the second focusing section 23, illuminating the narrow-angle region, can also continuously change from a state where only the first light-emitting element 11 emits light to a state where both the first light-emitting element 11 and the second light-emitting element 12 emit light. All other structures, operations, and effects of this embodiment are the same as those of the fourth embodiment, except as described above.

[0144] <Sixth Implementation Method>

[0145] Next, the sixth embodiment will be described.

[0146] Figure 18 This is a top view showing the light source section of this embodiment.

[0147] Figure 19 This is a cross-sectional view showing the optical components of this embodiment.

[0148] In the light-emitting device 50e of this embodiment, a light source section 10e is provided. In the light source section 10e, one or more first light-emitting elements 11 are provided in a first region 51. In a second region 52, one or more first light-emitting elements 11, one or more second light-emitting elements 12, one or more third light-emitting elements 13, and one or more fourth light-emitting elements 14 are provided. In a third region 53, one or more first light-emitting elements 11, one or more second light-emitting elements 12, one or more third light-emitting elements 13, and one or more fourth light-emitting elements 14 are also provided. Therefore, in the entire light source section 10e, there are three or more first light-emitting elements 11, and two or more second light-emitting elements 12, third light-emitting elements 13, and fourth light-emitting elements 14 are provided. The first region 51 is a circular region including the center of the wiring board 15, the second region is an annular region arranged around the first region 51, and the third region 53 is an annular region arranged around the second region 52.

[0149] In this embodiment, for example, similar to the fourth embodiment, the color temperature of the light emitted from the first light-emitting element 11 is 2700K, the color temperature of the light emitted from the second light-emitting element 12 is 2000K, the color temperature of the light emitted from the third light-emitting element 13 is 3500K, and the color temperature of the light emitted from the fourth light-emitting element 14 is 6500K. However, it is not limited to this; the color temperatures only need to be different from each other.

[0150] Furthermore, in the light-emitting device 50e, similar to the second embodiment, the optical component 20a also includes a second light-guiding section 26 and a flat plate section 27 for guiding light incident from the third region 53 surrounding the second region 52. The half-value angle of the light emitted from the second light-guiding section 26 is larger than the half-value angle of the light emitted from the first light-guiding section 24.

[0151] The second light guide portion 26 is disposed on the outer side of the flat plate portion 25. The second light guide portion 26 is a transparent cylindrical component that surrounds the first light guide portion 24 in a ring shape. The second light guide portion 26 is disposed at a position on the light source portion 10c corresponding to the third region 53, for example, disposed at a position opposite to the third region 53.

[0152] The effects of this implementation method will be explained.

[0153] According to this embodiment, since four light-emitting elements with different color temperatures are provided, similar to the fourth embodiment, the color temperature can be controlled over a wide range. Furthermore, it is possible to smoothly and continuously transition from a state where only the first light-emitting element 11 emits light to a state where all light-emitting elements emit light. Therefore, the color temperature, luminous flux, and beam distribution angle can be continuously varied. In addition, the color of the light can also be varied along the blackbody radiation.

[0154] Furthermore, since a light-emitting element is disposed in the third region 53 of the light source section 10e, and the optical component 20a has a second light guide section 26 for guiding light incident from the third region 53, the light distribution angle can be varied over a wider range.

[0155] This invention can be applied, for example, to indoor lighting devices.

Claims

1. A light-emitting device, characterized in that, have: The first focusing section is a convex lens; The second light-concentrating part is disposed around the first light-concentrating part and has an inner surface and an outer surface, the outer surface being curved outward relative to the light-emitting surface; The first light guide is a cylindrical component that surrounds the second light focusing part in an annular shape; One or more first light-emitting elements are disposed at positions corresponding to the first light-concentrating portion; One or more second light-emitting elements are disposed at positions corresponding to the first light guide portion; When the second light-emitting element is lit, the half-value angle of the light emitted from the surface emitting the light from the first light guide is larger than the half-value angle of the light emitted from the surface emitting the light from the first light-concentrating part when the first light-emitting element is lit.

2. The light-emitting device as described in claim 1, characterized in that, The minimum radius of curvature of the outer surface is greater than 0.6 mm and less than 28 mm.

3. The light-emitting device as described in claim 1, characterized in that, It also has: The second light guide is a cylindrical component that surrounds the first light guide in a ring shape. One or more third light-emitting elements are disposed at positions corresponding to the second light guide portion; The first light guide and the second light guide are transparent components with trapezoidal cross-sectional shapes on the planes perpendicular to the light emission surface, and the cone angle of the second light guide is smaller than that of the first light guide.

4. The light-emitting device as described in claim 3, characterized in that, The taper ratio of the first light guide is greater than 0 and less than 0.

54.

5. The light-emitting device as described in claim 3, characterized in that, The taper ratio of the second light guide is 0 or higher and 0.1 or lower.

6. The light-emitting device as claimed in claim 1, characterized in that, The first light-concentrating part is a convex lens, and the first light-guiding part is a transparent component arranged in a ring around the convex lens.

7. The light-emitting device as described in claim 6, characterized in that, The minimum radius of curvature of the convex lens is greater than 0.3 mm and less than 13 mm.

8. The light-emitting device as claimed in claim 1, characterized in that, The color temperature of the light emitted from the second light-emitting element is different from the color temperature of the light emitted from the first light-emitting element.

9. The light-emitting device as claimed in claim 1, characterized in that, The first light-emitting element is disposed in the first region. The second light-emitting element is disposed in a second region surrounding the first region. The color temperature of the light emitted from the second light-emitting element is different from the color temperature of the light emitted from the first light-emitting element. A first circuit containing one or more first light-emitting elements and a second circuit containing one or more second light-emitting elements are connected in parallel. The number of stages of the first light-emitting elements connected in series in the first circuit is less than the number of stages of the second light-emitting elements connected in series in the second circuit.

10. The light-emitting device as claimed in claim 9, characterized in that, The first light-emitting element has two or more components. The first light-emitting element is also disposed in the second region.

11. The light-emitting device as claimed in claim 9, characterized in that, It also has a first resistive element connected in series with the first light-emitting element in the first circuit.

12. The light-emitting device as claimed in claim 9, characterized in that, It also has: One or more third light-emitting elements are disposed in the second region; One or more fourth light-emitting elements are disposed in the second region; The color temperature of the light emitted from the first light-emitting element, the color temperature of the light emitted from the second light-emitting element, the color temperature of the light emitted from the third light-emitting element, and the color temperature of the light emitted from the fourth light-emitting element are different from each other.

13. The light-emitting device as claimed in claim 12, characterized in that, A third circuit containing one or more third light-emitting elements and a fourth circuit containing one or more fourth light-emitting elements are connected in parallel. The number of stages of the third light-emitting elements connected in series in the third circuit is less than the number of stages of the fourth light-emitting elements connected in series in the fourth circuit.

14. The light-emitting device as claimed in claim 13, characterized in that, It also has a second resistive element connected in series with the third light-emitting element in the third circuit.

15. The light-emitting device as claimed in claim 12, characterized in that... It also has a second light guide section for guiding light incident from a third region surrounding the second region. The half-value angle of the light emitted from the second light guide is larger than that of the light emitted from the first light guide. The third light-emitting element and the fourth light-emitting element are each provided in two or more forms. The third light-emitting element and the fourth light-emitting element are also disposed in the third region.

16. The light-emitting device as claimed in claim 1, characterized in that, It also includes a flat plate portion arranged around the first light guide portion. The first light-concentrating part, the second light-concentrating part, the first light-guiding part, and the flat plate part are integrally formed from a transparent material.

17. A lighting device, characterized in that, have: The light-emitting device according to any one of claims 1 to 16; A radiating plate is configured at the position where the light emitted from the light-emitting device is incident; A cover component that covers the sides of the light-emitting device and the radiating plate.

Images