JP6220250B2 - LED light emitting device - Google Patents

Description

  The present invention relates to an LED light emitting device including an LED module on which a plurality of LEDs are mounted and a reflecting member having an upper opening, and more particularly to an LED light emitting device having good directivity even if the reflecting member having an upper opening is low.

  In recent years, since LEDs are semiconductor elements, they have long life and excellent driving characteristics, and are small, have high luminous efficiency, and have bright emission colors, so they are widely used for backlights and lighting of color display devices. It has come to be.

  Particularly in recent years, as a light emitting device such as a spotlight, there has been a demand for an LED light emitting device that obtains a parallel light beam group by combining an LED module in which a number of LEDs are mounted on a reflecting member having an upper opening such as a parabolic mirror.

  If a point light source is arranged at the focal position of the parabolic mirror, a parallel light beam group is obtained. However, the LED module usually becomes a surface light source having a finite light emitting area, and the parabolic mirror has a finite height. As a result, even if the center of the LED module is arranged at the focal point of the parabolic mirror, the LED module as the light source has a planar spread and the height of the parabolic mirror is limited. Therefore, it is impossible to obtain a parallel light beam group.

  With respect to this state, the relationship between the shapes of the light source and the reflecting member and the emitted light will be described with reference to FIGS. FIG. 12 is a cross-sectional view of the LED light emitting device 100 in which the point light source 101 is disposed at the focal point f of the parabolic mirror 50. As shown in FIG. 12, the light rays P0 emitted from the point light source 101 of the LED light emitting device 100 in all directions are reflected by the parabolic mirror 50 and all go upward. That is, the LED light emitting device 100 can obtain a group of parallel light rays with high light collecting properties. A part of the light rays P0 does not hit the parabolic mirror 50 and travels obliquely upward.

  Next, an LED light emitting device 110 in which a surface light source that extends two-dimensionally at the focal point f of the parabolic mirror 50 will be described with reference to FIG. FIG. 13 is a cross-sectional view of the LED light emitting device 110 in which the surface light source 102 (LED module) in which a plurality of LEDs are mounted is disposed at the focal point f of the parabolic mirror 50. A light ray P1 emitted from the left end of the surface light source 102, a light ray P2 emitted from the center, and a light ray P3 emitted from the right end are respectively reflected by the parabolic mirror 50 and directed upward at different angles. That is, the light rays P1, P2, and P3 emitted from the planar light source 102 spreading in a plane form a non-parallel light ray group after being reflected by the parabolic mirror 50. Similarly, the light rays P4, P5, and P6 reflected by other portions of the parabolic mirror 50 are also non-parallel light ray groups. Further, in FIG. 13, since the height of the parabolic mirror 50 is finite, there are some rays that are diffused to the outside without being reflected by the parabolic mirror 50, such as a light beam Po indicated by a broken line.

  Some LED light emitting devices 110 that generate non-parallel light groups have been proposed in which light beams obtained from a light source spread in a planar shape are once collected at the focal point of a parabolic mirror to obtain parallel light groups. ing. (For example, Patent Document 1 (FIG. 15), Patent Document 2 (FIG. 2))

  Hereinafter, the configuration of the light-emitting device described in FIG. 15 of Patent Document 1 will be described with reference to FIG. FIG. 14 is a cross-sectional view of the light-emitting device 200 rewritten without departing from the spirit of the light-emitting device described in FIG. A light emitting device 200 shown in FIG. 14 includes a parabolic mirror 50 having an opening 50 a at the bottom, a conical light guide member 60 inserted into the opening 50 a of the parabolic mirror 50, and an input surface of the light guide member 60. It comprises a surface light source 201 having a plurality of laser light emitting elements 201 a, 201 b, 201 c arranged on the side, and a light scatterer 70 provided on the top of the light guide member 60. This light scatterer 70 is provided at the position of the focal point f of the parabolic mirror 50.

  The light emitting elements included in the surface light source 201 of the light emitting device 200 are laser light emitting elements 201a, 201b, and 201c having different emission colors. The light beams emitted from the laser light emitting elements 201 a, 201 b, and 201 c propagate while repeating total reflection inside the light guide member 60 and enter the light scatterer 70. In the light scatterer 70, the incident light beam is scattered and mixed at the same time. Since the scatterer 70 is provided at the position of the focal point f of the parabolic mirror 50, the light beam radiated from the scatterer 70 is reflected by the parabolic mirror 50 to become a parallel light beam group. A part of the light beam Po does not hit the parabolic mirror 50 and travels obliquely upward.

  Similarly, in FIG. 2 of Patent Document 2, a light beam emitted from a light source spreading in a planar shape is guided to the focal point of the parabolic mirror with a conical light guide member whose apex is at the focal point of the parabolic mirror, A light emitting device is shown that obtains a group of parallel rays from the rays.

Japanese Patent Laying-Open No. 2011-65979 (FIG. 15) Japanese Patent Laying-Open No. 2005-38605 (FIG. 2)

  In the method of obtaining parallel light beams after once converging light rays at the focal point of the parabolic mirror as in the light emitting devices described in Patent Document 1 and Patent Document 2, the height of the parabolic mirror (reflecting member) is obtained. Must be large enough. On the other hand, when the parabolic mirror is shallow, most of the light beams traveling in the obliquely upward direction from the focal point are not reflected by the parabolic surface and continue to proceed in the obliquely upward direction. That is, the light emitted from the light emitting device spreads. That is, the light emitting devices as disclosed in Patent Documents 1 and 2 have a problem that a parabolic mirror has to be enlarged when trying to obtain a parallel light beam group.

  Furthermore, when a laser light emitting element that emits light in only one direction as in the light emitting device of Patent Document 1 can be used, all light can be totally reflected in the conical light guide member and condensed at the apex. . On the other hand, when an LED in which the light distribution of emitted light is widely spread as a light source is used, even if light is incident on a conical light guide, it is greatly inclined with respect to the axis of the light guide. Since light rays exist, there is a problem that these light rays leak from the light guide and there are fewer components that can be used as highly directional light.

  Further, when an LED light emitting device including a reflecting member such as a parabolic mirror is used for an illumination device or the like, directivity of a certain level or more may be required without requiring a complete parallel light beam group.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and to provide an LED light emitting device that is small in size, has high light utilization efficiency, and can obtain a parallel light beam group at a practical level.

In order to achieve the above object, a configuration of an LED light emitting device of the present invention includes one LED module in which a plurality of LEDs are mounted on a module substrate, and a reflecting member having an upper opening on the light emitting surface side of the one LED module. in the LED light emitting apparatus, the light emitting surface of the one LED module is disposed inside of the reflective member, disposed one transparent cones on the upper surface of the one LED module, wherein one of the LED module, wherein One transparent cone and the reflecting member are arranged so that their central axes coincide with each other, and the top of the one transparent cone is flat .

  According to the said structure, in the LED light-emitting device of this invention, there exist three forms in the progression process of the light ray which radiate | emitted the LED module. In a 1st form, the light ray which cannot enter into the transparent cone transparent cone arrange | positioned above an LED module reaches | attains a reflection member directly, and it reflects and heads upwards there. In the second embodiment, the light enters the transparent cone from the bottom surface of the transparent cone, and then reaches the slope of the transparent cone, and the light emitted from the slope is refracted twice by the bottom and slope of the transparent cone. Heading upward so as to be vertically deviated. Furthermore, in the third embodiment, light rays that enter the transparent cone from the bottom surface of the transparent cone, first totally reflected by the slope of the transparent cone, and then emitted from another part of the slope of the transparent cone are transmitted from the transparent cone. When the light is emitted, the traveling direction is deviated in the horizontal direction, and then reflected upward by the reflecting member.

  In the LED light-emitting device according to the present invention, among the three forms related to the above-described light travel, there is light traveling in the second form and the third form. Can be lowered. That is, light that travels obliquely upward when there is no transparent cone is biased in the axial direction by two refractions in the second form, and is deflected in the horizontal direction when emitted from the transparent cone in the third form, The light is reflected by the reflecting member and goes upward. Moreover, in the LED light-emitting device of this invention, since the planar LED module is arrange | positioned inside a reflection member, the external shape is decided by the external shape of a reflection member.

  A lower opening may be provided below the reflecting member, and the LED module may be disposed in the lower opening of the reflecting member.

  The transparent cone has a transparent flange, and is preferably held by the reflecting member by the flange.

  The LED may have a phosphor layer.

  As described above, the LED light-emitting device of the present invention can be reduced in size because a planar LED module can be disposed inside the reflecting member, so that the height of the reflecting member can be reduced. Many light beams emitted from the LED module can also be achieved. Is directed upward, so that the luminous efficiency is excellent, and a practical parallel light beam group can be easily obtained.

It is sectional drawing of the LED light-emitting device in embodiment of this invention. It is the perspective view and sectional drawing of a transparent cone shown in FIG. It is sectional drawing which shows the light distribution of the LED light-emitting device shown in FIG. It is sectional drawing which shows the light distribution of the LED light-emitting device shown as a reference example. It is a light distribution map which shows the brightness of the distant place of the LED light-emitting device shown in FIG. It is a light distribution map which shows the brightness of the distant place of the LED light-emitting device of the reference example shown in FIG. It is sectional drawing which shows the light distribution of the LED light-emitting device shown in FIG. It is sectional drawing which shows the light distribution of the LED light-emitting device of the reference example shown in FIG. It is a top view of the LED module shown in FIG. It is AA sectional drawing of the LED module shown in FIG. It is sectional drawing of LED shown in FIG. It is sectional drawing of the conventional LED light-emitting device. It is sectional drawing of the conventional LED light-emitting device. It is sectional drawing of the conventional light-emitting device.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of an LED light emitting device 10 according to an embodiment of the present invention. As shown in FIG. 1, a parabolic mirror 5 as a reflecting member is placed on the mounting substrate 7, and a lower opening 5 k is formed at the bottom of the parabolic mirror 5. At a position corresponding to the lower opening 5k of the parabolic mirror 5, there is an LED module 2 in which a plurality of LEDs 11, LED 12, LED 13, LED 14, and LED 15 (showing five LEDs as examples) are mounted on the module substrate 2a. Has been placed. Further, a transparent cone 3 is disposed on the upper surface side of the LED module 2. The bottom surface of the transparent cone 3 and the light emitting surface of the LED module 2 face each other with a gap. In the LED light emitting device 10, the light emitting surface of the LED module 2 and the transparent cone 3 are all disposed inside a parabolic mirror 5 having an upper opening. In the LED light emitting device 10, the central axis of the LED module 2, the central axis of the transparent cone 3, and the central axis of the parabolic mirror 5 are coincident with each other.

  2 shows the transparent cone 3 incorporated in the LED light emitting device 10 shown in FIG. 1, wherein (a) is a perspective view and (b) is a cross-sectional view. A flange 4 formed of the same transparent member is provided on the lower side of the transparent cone 3, and the LED module 2 is held by holding the flange 4 on the reflecting surface of the parabolic mirror 5 as shown in FIG. A transparent cone 3 is arranged on the upper surface side of the. In the transparent cone 3, the apex portion is flattened (conical frustum), but the apex portion may be curved or bent. If the apex portion is a flat surface or a curved surface, light rays directly upward are generated, so that the light emission efficiency can be improved.

  Next, the light distribution of the LED light emitting device 10 will be described with reference to FIGS. 3, 5, and 7, comparing with the light distribution of the reference examples shown in FIGS. 4, 6, and 8. FIG. 3 is a cross-sectional view showing a light distribution of the LED light-emitting device 10, and a light emission from the LED 13 arranged at the center among the plurality of LEDs 11 to 15 mounted on the LED module will be described as a representative example. FIG. 4 is a cross-sectional view showing a light distribution of the LED light emitting device 20 shown as a reference example. The LED light-emitting device 20 is obtained by removing the transparent cone 3 from the LED light-emitting device 10 and has a configuration widely used as an LED light-emitting device from the past. The LED 13 is on the axis of the LED light emitting devices 10 and 20.

  First, a reference example shown in FIG. 4 having a simple optical system will be described. The distribution of light beams emitted from the LED 13 mounted at the center of the LED module 20 has a Lambertian characteristic. Of this group of rays, the rays Pa and Pg emitted at a low angle are reflected by the parabolic mirror 5 and emitted upward as light having directivity together with the rays Pd. On the other hand, the light rays Pb, Pc, Pe, and Pf emitted at a high angle are not reflected and are diffused to the outside (obliquely upward) as invalid light because the height of the parabolic mirror 5 is low. Note that the transparent cone 3 is not disposed in the LED light emitting device 20, but the transparent cone 3 is arranged when the LED light emitting device 20 is modified to the LED light emitting device 10 in order to clarify the correspondence with the LED light emitting device 10. The position to be set is indicated by a dotted line.

  Next, the operation of the LED light emitting device 10 having the transparent cone 3 will be described with reference to FIG. There are an infinite number of light rays emitted from the LED 13, and among these, the light rays Pa to Pg shown in FIG. 4 are also used in FIG.

  As shown in FIG. 3, in the LED light emitting device 10, the LED module 2 and the transparent cone 3 are arranged inside a parabolic mirror 5. The parabolic mirror 5, the LED module 2, and the transparent cone 3 are in a coaxial relationship, and a gap exists between the parabolic mirror 5 and the LED module 2. A group of rays emitted from the LED 13 mounted in the center of the LED module 2 has a Lambertian characteristic, and these groups of rays are divided into three forms. The first of these is a group of rays emitted at a low angle θc, and includes rays Pa and Pg. This light ray group (light ray Pa, Pg, etc.) does not enter the transparent cone 3 arranged above the LED module 2, but directly reaches the reflecting surfaces 5a and 5b of the parabolic mirror 5, and is reflected there and reflected upward. Head for. That is, the light ray group (light ray Pa, Pg, etc.) from the gap between the LED module 2 and the transparent cone 3 toward the parabolic mirror 5 has no change in the path regardless of whether the transparent cone 3 is present or not. Heading over the device 10.

  The second form is a group of light rays that enter the transparent cone 3 from the bottom surface of the transparent cone 3 at a medium incident angle θd, and includes light rays Pb and Pf. This light ray group (light rays Pb, Pf, etc.) is directed upward by being refracted twice by the bottom surface of the transparent cone 3 and the inclined surfaces 3a, 3b. At this time, since the second refraction occurs on the inclined surfaces 3a and 3b, the light beams belonging to the second form are biased in the vertical direction. For example, the light ray Pb is refracted in the axial direction on the bottom surface of the transparent cone 3 and further refracted in the axial direction on the inclined surface 3a. When there is no transparent cone 3, the light ray Pb becomes Pb ′ indicated by a dotted line. That is, the transparent cone 3 causes a part of the light ray group (light rays Pb ′, Pf ′, etc.) to be directed obliquely upward in the LED light emitting device 10 to the upward component (light rays Pb, Pf emitted from the transparent cone 3). Etc.).

  The third form is a light ray group that enters the transparent cone 3 from the bottom surface of the transparent cone 3 at a large incident angle θe, and includes light rays Pc and Pe. This ray group (light rays Pc, Pe, etc.) is totally reflected by the inclined surfaces 3a, 3b of the transparent cone 3 and is emitted from the opposite inclined surfaces 3b, 3a. At this time, when the light beam belonging to the third form is refracted and emitted from the slope on the opposite side, it is biased in the horizontal direction compared to when it is emitted from the LED 13, and at this angle, the reflecting surface 5a of the parabolic mirror 5 Reach 5b, where it reflects and heads upward.

  For example, the light ray Pc is incident from the bottom surface of the transparent cone 3 at a relatively large incident angle θe, is totally reflected by the inclined surface 3a of the transparent cone 3, and travels toward the opposite inclined surface 3b. The direction of travel is greatly biased horizontally. Further, the light ray Pc is refracted in the axial direction on the inclined surface 3 b and is emitted from the transparent cone 3. Even if the light ray Pc is refracted in the axial direction and emitted, it is greatly deviated in the horizontal direction due to total reflection. Therefore, when the light ray Pc is emitted from the transparent cone 3, it is more deviated in the horizontal direction than when emitted from the LED 13. Thereafter, the light ray Pc is reflected by the reflecting surface 5b of the parabolic mirror 5 and travels upward. Note that. In the absence of the transparent cone 3, the light ray Pc becomes Pc ′ indicated by a dotted line. That is, the transparent cone 3 causes a part of the light ray group (light rays Pc ′, Pe ′, etc.) to be directed obliquely upward in the LED light emitting device 10 to the upward component (light rays Pc, Pe emitted from the transparent cone 3). Etc.).

  The light beam Pd incident on the axis perpendicularly to the bottom surface of the transparent cone 3 is not refracted by the transparent cone 3 and goes directly upward. Further, the third traveling form includes one that repeats total reflection a plurality of times. In FIG. 3, the light beam traveling upward is indicated by the arrow in the vertical direction, but is displayed for convenience in order to simplify the explanation, and is actually deviated from the vertical direction.

  As described above, in the LED light emitting device 10, the transparent cone 3 is disposed above the LED module 2, and the light beams Pa and Pg that are not incident on the transparent cone 3 directly enter the reflecting member (parabolic mirror 5). Arrives and reflects up there. Further, light rays Pb and Pf incident at an incident angle θd smaller than a predetermined angle from the bottom surface of the transparent cone 3 are directed upward by being refracted twice by the bottom surface and the inclined surface of the transparent cone 3. Further, a light beam incident at an incident angle θe larger than a predetermined angle from the bottom surface of the transparent cone is first totally reflected by the slope of the transparent cone, and then emitted in a horizontal direction from the opposite slope of the transparent cone 3. Reflected by the reflecting member and headed upward.

  When comparing the light distribution of the LED light emitting device 10 shown in FIG. 3 with the light distribution of the LED light emitting device 20 shown in FIG. 4, the LED light emitting device 20 diverges and becomes invalid as shown in FIG. The light rays Pb ′, Pc ′, Pe ′, and Pf ′ that have been converted into the effective light rays Pb, Pc, Pe, and Pf that are directed upward by the arrangement of the transparent cone 3 in the LED light emitting device 10.

  Next, the brightness distribution in a place sufficiently far from the LED light emitting devices 10 and 20 will be described with reference to FIGS. FIG. 5 is a light distribution diagram showing the brightness of the LED light emitting device 10 in the distance (1 m), and FIG. 6 is a light distribution diagram showing the brightness of the LED light emitting device 20 in the distance (1 m).

  In the light distribution diagrams of the LED light emitting devices 10 and 20 shown in FIG. 5 and FIG. 6, the hatching density indicates the intensity of brightness (the number of rays per unit solid angle), and the higher the density, the brighter the state. ing. A field angle F at a distant position indicates a necessary illumination range in flash emission.

  When comparing the light distribution of the LED light emitting device 10 shown in FIG. 5 with the light distribution of the LED light emitting device 20 shown in FIG. 6, the light distribution of the LED light emitting device 20 shown in FIG. Since the light rays in the region other than the central portion, that is, the peripheral portion diverge almost evenly, the brightness at the angle of view F is insufficient. On the other hand, in the light distribution of the LED light emitting device 10 shown in FIG. 5, the light rays are condensed near the center, and a bright area is also spread near the center, and the brightness at the angle of view F is improved. Has been. That is, the LED light emitting device 20 has been able to accommodate the light beam that spreads beyond the angle of view F within the angle of view F in the LED light emitting device 10.

  The reason why this difference occurs will be described from the state of light rays in the vicinity of the light source unit with reference to FIGS. As shown in FIG. 4, the characteristics of the light beam group of the LED light emitting device 20 are that the light emitted from the LED 13 mounted on the LED module 2 is only partially reflected by the reflecting surface of the parabolic mirror 5 (light rays Pa, Pg, etc.). Although it reflects and goes up, many light ray groups (light rays Pb, Pc, Pe, Pf, etc.) spread to the circumference. For this reason, the brightness increases only in a narrow range of the central portion, but the light rays Pb, Pc, Pe, Pf, etc. spread evenly in other ranges. In addition, since the light emitted from the LEDs 11, 12, 14, and 15 located away from the central axis is emitted from the LED device 10 with a slight inclination from above, the bright range is widened far away.

  On the other hand, as shown in FIG. 3, the characteristics of the light beam group of the LED light emitting device 10 are not only the light beams Pe, Pa, Pd, Pf, Pg, etc., which are directed upward by the reflecting member 5 and the transparent cone 3, but in the vicinity of the center. Condensate. Actually, as will be described later, light emitted from the LEDs 11, 12, 14, 15 located away from the central axis is inclined from above and emitted from the LED device 10, and light emitted from the transparent cone 3 is also emitted. Inclined and emitted. In this way, the light distribution of the LED device 10 can be brightened even in a slightly widened area from the center.

  3 and 4, a group of light rays emitted from the center of the surface light source (LED module 2) that is the focal point of the parabolic mirror 5 in the LED device 10 of the present invention and the LED device 20 of the comparative example, that is, LEDs. A group of light beams emitted from the LED 13 mounted at the center position of the module 2 is illustrated. On the other hand, a group of light rays emitted from other parts of the surface light source show the same tendency while acting to blur the light distribution by light emission from the focal point. An example of light distribution from the LED mounted at a position shifted from the central axis will be described with reference to FIGS.

  FIG. 7 is a functional cross-sectional view of the LED light-emitting device 10, and the member configuration is the same as FIG. FIG. 7 shows a light distribution of the LEDs 12 arranged at the second position from the center among the plurality of LEDs mounted on the LED module 2. Similarly, FIG. 8 is a functional cross-sectional view of the LED light-emitting device 20, and the member configuration is the same as FIG. FIG. 8 also shows the light distribution of the LED 12. The same members and corresponding light beams as those in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description is omitted.

  First, the light distribution of the LED light emitting device 20 having a simple optical system will be described with reference to FIG. Compared with FIG. 4, in FIG. 8, the entire light distribution is deformed by replacing the LED 13 as the light emitting source with the LED 12. That is, the light beams Pa and Pg reflected by the parabolic mirror 5 are inclined to the left side of the figure. Light rays Pc, Pa, Pe, Pf, etc. that are not reflected by the parabolic mirror 5 have a large right component. For the same reason, the light distribution of the LED 11 is further deformed. Similarly, the light distribution of the LEDs 14 and 15 is deformed to the opposite side to the light distribution of the LEDs 11 and 12.

  Next, the light distribution of the LED light emitting device 10 of the present invention will be described with reference to FIG. Compared with FIG. 3, in FIG. 7, the light beams Pa and Pg directly reflected by the parabolic mirror 5 are inclined to the left side of the figure as in FIG. 8. The light rays Pb and Pf incident on the bottom surface of the transparent cone 3 and emitted from the transparent cone 3 have an emission angle equal to the emission angles of the light rays Pb and Pf in FIG. Therefore, it becomes parallel to the light rays Pb and Pf in FIG. Light rays Pc and Pe that are incident on the bottom surface of the transparent cone 3 and are totally reflected by the slope of the transparent cone 3 and then emitted from another part of the slope are transparent if the emission angle from the LED module 2 is θe. Although the angle emitted from the cone 3 is the same as the light rays Pc and Pe in FIG. 3, the emission position from the transparent cone 3 and the reflection position on the parabolic mirror 5 are different. For example, in the case of the light beam Pe, it is emitted from the upper part of the transparent cone 3 and reflected from the upper part of the parabolic mirror 5 than the light beam Pe in FIG. As a result, the light beam Pe in FIG. 7 is inclined in the axial direction (right side in the figure) than the light beam Pe in FIG. 3. As described above, a part of the light beam emitted from the LED 12 is emitted in a direction different from the light beam of the corresponding LED 13. Similarly, the light rays (a part) emitted from the LEDs 11, 14, and 15 are directed in different directions from the light rays emitted from the LED 13.

  As described above, in the conventional LED light emitting device 20 and the light emitting device 10 of the present invention, when the parabolic mirror 5 and the LED module 2 constituting the surface light source are combined, the light distribution is at the focal point of the parabolic mirror. The light distribution is blurred from the point light source. Similarly, when the light source is shifted from the focal point in the axial direction, the light distribution is blurred.

  Finally, FIG. 9 to FIG. 11 show an example of the LED module 2 used in the LED light emitting device 10. 9 is a plan view of the LED module 2, FIG. 10 is a cross-sectional view taken along the line AA of the LED module 2 shown in FIG. 9, and FIG. 11 is a cross-sectional view of the LED 15 shown in FIG. The rectangular module substrate 2a has a circular region 2b in the center, and the LEDs 13 are arranged inside the region 2b. Around the LED 13, a plurality of LEDs are arranged and mounted so as to fill a circular area. A plurality of LEDs are connected in series or in parallel by a wiring (not shown) to form a substantially circular surface light source. The LEDs 11 to 15 shown in FIG. 1 and the like are obtained by extracting five of the nine LEDs shown in FIG.

  FIG. 11 is a cross-sectional view of the LED 15 shown in FIG. The LED 15 is not an LED die in a bare chip state, but the LED die 1 is covered with the phosphor layer 1a and the side surface with the reflection layer 1b. Thus, the LED 15 is a package product in which the LED die 1 is integrated with the phosphor layer 1a and the reflective layer 1b. Thus, by setting it as the structure which arranges the packaged LED on the LED module board | substrate 2a, since a different luminescent color can be set for every LED, the surface light source which can adjust luminescent color is realizable. Alternatively, a plurality of bare die LED dies may be mounted on the module substrate 2a, and all the LED dies may be covered with a common phosphor layer.

  In the LED light emitting device 10, the LED module 2, the transparent cone 3, and the parabolic mirror 5, which is a reflecting member, are arranged with their center axes aligned. However, if the light condensing property may be somewhat deteriorated, the LED module 2, the transparent cone 3 and the parabolic mirror 5 which is a reflecting member do not have to have the same central axis.

  In the LED light emitting device 10, the lower opening 5k is provided below the parabolic mirror 5 that is a reflecting member, and the LED module 2 is disposed in the lower opening 5k of the reflecting member. However, the LED light emitting device of the present invention may not have a lower opening. In this case, the LED light emitting device may be arranged in a reflecting member such as a parabolic mirror. The LED module can be easily handled by providing the opening 5k.

  In the LED light-emitting device 10, the transparent cone 3 has a transparent flange 4, and is held by the parabolic mirror 5 which is a reflecting member by the flange 4. However, the method for fixing the transparent cone may not be a flange. For example, a transparent cone may be fixed to the module substrate. If the transparent cone is fixed with a transparent flange, the shadow of the fixing portion disappears, and the entire transparent cone becomes larger, which makes it easier to handle.

  In the LED light emitting device 10, the LEDs 11 to 15 and the like have a phosphor layer. However, in the LED light emitting device of the present invention, the LED does not have a phosphor layer, and the emitted color of the LED die may be emitted as it is. For example, the LED die may be mounted on a module substrate without emitting a phosphor layer so that the LED module emits white light, and the LED module emits white light. If each LED has a phosphor layer, white light is emitted by the LED alone, so a white light source can be easily obtained.

  In the LED light emitting device 10, the reflecting member is a parabolic mirror. However, the reflecting member is not limited to a parabolic mirror, and may be any member that has an opening at the top and a slope so that the reflected light is directed toward the top. Of these reflecting members, the parabolic mirror is characterized by good light condensing properties (directivity).

DESCRIPTION OF SYMBOLS 1 LED die 1a Phosphor layer 1b Reflector layer 2 LED module 2a Module substrate 3 Transparent cone 3a, 3b Slope 4 Flange 5, 50 Parabolic mirror 5a, 5b Reflective surface 7 Mounting substrate 10, 20, 100 LED light emitting device 11-15 LED
50a opening 60 light guide member 70 light scatterer 101 point light source 102, 201 surface light source 200 light emitting device 201a, 201b, 201c laser light emitting element Pa to Pg, P0 to P6, Po light

Claims (4)

In an LED light emitting device including one LED module having a plurality of LEDs mounted on a module substrate, and a reflective member having an upper opening on the light emitting surface side of the one LED module,
The light emitting surface of the one LED module is disposed inside the reflecting member,
One transparent cone is disposed on the upper surface of the one LED module;
The one LED module, the one transparent cone, and the reflecting member are arranged with their center axes aligned with each other,
The LED light-emitting device, wherein a top portion of the one transparent cone is flat . The LED light-emitting device according to claim 1, wherein a lower opening is provided below the reflecting member, and the one LED module is disposed in the lower opening of the reflecting member. The transparent cone has a transparent flange, LED light-emitting device according to claim 1 or 2, characterized in that it is held by the reflecting member by said flange. The LED, LED light-emitting device according to any one of claims 1 to 3, wherein a phosphor layer.

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