JP2006134948A - Light emitting light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting light source capable of improving use efficiency of light for improved and uniform brightness by properly controlling an emission direction of the light emitted by a light emitting layer of a light emitting element. <P>SOLUTION: A light emitting element 2 in which a plurality of layers including a light emitting layer 7 are laminated, is provided inside a recess 5 in which a light reflecting part 6 is formed. A front side outgoing surface A and a rear side outgoing surface B are formed on the side surface of the light emitting element 2. A front side reflecting surface R2 corresponding to the outgoing surface A and a rear side reflecting surface R1 corresponding to the outgoing surface B are formed as the light reflecting part 6. The reflecting surfaces R1 and R2 are so formed that inclination angles θ1 and θ2 against an install surface 5a differ from each other. A connection point 23 between the reflecting surface R1 and the reflecting surface R2 is set on the rear side in optical axis direction F instead of the front side surface 2a of the light emitting element 2 in the optical axis direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light-emitting light source using a light-emitting element such as a light-emitting diode (LED) element, and more particularly to a light-emitting light source used as a light source for a display device such as a liquid crystal display device or a light source for a lighting device.

  A light-emitting light source using a light-emitting element such as an LED element is described in Patent Document 1, for example. FIG. 11 is a cross-sectional view showing the structure of a chip-type light emitting device described in Patent Document 1. The light emitting device includes a substrate 61, an LED element 62 mounted on the substrate 61, and an opening 63a having a circular shape when viewed from above, and an inner wall of the opening 63a is formed of an inclined surface. The reflector 63 is mounted on the substrate 61 so as to surround the LED element 62 in the center. The inclined surface of the reflector 63 is formed by connecting two reflecting surfaces 64 a and 64 b having different inclination angles θa and θb with respect to the installation surface 61 a of the LED element 62. The two reflection surfaces 64a and 64b have angles of inclination θa and θb that reflect light from the light emission center of the LED element 62 in the directly upward direction (optical axis direction F) at the middle portions 65a and 65b of the reflection surfaces 64a and 64b. Is selected and formed. The position 66 where the two reflecting surfaces 64a and 64b are connected is further away from the position 67 of the light emitting portion of the LED element 62 with respect to the installation surface 61a.

  Moreover, in the light emitting light source using the light emitting element, the side surface is formed so that the light emitted from the light emitting layer is emitted from the side surface in order to efficiently emit the light emitted from the light emitting element to the outside and increase the light utilization efficiency. A light emitting element is used. A light-emitting light source using a light-emitting element that emits light from such a side surface is described in Patent Document 2, for example.

FIG. 12 is a cross-sectional view showing the structure of the optical device described in Patent Document 2. The optical device includes a base body 70 having a recessed portion 71 and a light emitting element 72 attached in the recessed portion 71. On the side surface of the light emitting element 72, an inclined surface 73 is formed that decreases in width toward the installation surface side of the light emitting element 72. Light is emitted from the inclined surface 73 toward the installation surface side of the light emitting element 72, that is, toward the rear side in the optical axis direction F. Further, the inner peripheral surface 74 of the recessed portion 71 is configured as a reflector. The reflector is formed in the shape of a semiparabola, for example, whose side slope increases toward the outside.
JP 2000-269551 A Special table 2003-523635 gazette

  In the apparatus described in Patent Document 1, two reflecting surfaces 64a and 64b having different inclination angles θa and θb are formed to be connected to each other, but the two reflecting surfaces 64a and 64b are both in the optical axis direction F. It is formed in order to control the traveling direction of light emitted in an oblique direction toward the front side. Therefore, when the light emitting element 72 having the inclined surface 73 that emits light from the side surface as shown in FIG. 12 is used for the device described in Patent Document 1, the light emitted from the inclined surface 73 is used. There is a problem that the direction of travel cannot be appropriately controlled.

  Further, in the device described in Patent Document 2, the shape of the reflector, that is, the shape of the reflecting surface is made an aspherical surface, for example, in the form of a semiparabola, and is emitted obliquely from the inclined surface 73 toward the rear side in the optical axis direction F The reflection direction of the emitted light is controlled. However, the shape of the reflector has a problem that the traveling direction of the light emitted in the direction perpendicular to the optical axis direction F and the light emitted forward of the optical axis direction F cannot be appropriately controlled.

  An object of the present invention is to appropriately control the traveling direction of light emitted from a light emitting layer of a light emitting element to improve light utilization efficiency, and to improve luminance and make luminance uniform. It is to provide a simple light emission source.

The present invention includes a light emitting device configured by laminating a plurality of layers including a light emitting layer, and a support member having a recess and having a light reflecting portion formed in the recess, and the light emitted from the light emitting device In a light emitting light source configured to emit directly from the opening surface of the recess, and reflected by the light reflecting portion formed in the recess and exit from the opening surface of the recess,
The direction perpendicular to the surface of the light emitting layer and toward the opening surface side of the recess is the optical axis direction,
On the side surface of the light emitting element, at least two emission surfaces having different shapes of intersecting lines with a longitudinal section parallel to the optical axis direction are formed,
The light reflecting portion is configured by connecting a plurality of reflecting surfaces having mutually different shapes of intersecting lines with the longitudinal section, and is located on the rearmost side with respect to the optical axis direction among the plurality of reflecting surfaces. The light-emitting light source is characterized in that the rear-side reflection surface and the front-side reflection surface connected to the rear-side reflection surface are connected rearward from the position of the front surface in the optical axis direction of the light-emitting element.

  According to the present invention, light is emitted from the front surface in the optical axis direction of the light emitting element, and light is also emitted from at least two light emitting surfaces formed on the side surface of the light emitting element. And most of the emitted light from the front surface in the optical axis direction is directly emitted from the opening surface of the recess in which the light emitting element is installed, and a part thereof, that is, light that is emitted with a large inclination with respect to the optical axis direction. Is reflected from the light reflecting portion formed in the recess, and the reflection direction is controlled, and the light is emitted from the opening surface of the recess. Here, the opening surface of the concave portion refers to a virtual plane at a portion where the concave portion and the front end surface in the optical axis direction of the support member where the concave portion is formed intersect.

  Further, the emitted light from the light emitting surface on the side surface of the light emitting element has a larger component in the direction orthogonal to the optical axis direction than the emitted light emitted from the front surface in the optical axis direction. Therefore, a part of the light emitted from the side surface of the light emitting element is incident on the light reflecting portion formed in the concave portion at a position located on the rear side in the optical axis direction from the position on the front surface in the optical axis direction of the light emitting element. To do. In this portion, at least a rear side reflection surface and a part of a front side reflection surface connected to the rear side reflection surface are formed. Since the rear side reflection surface and the front side reflection surface have different shapes, the control characteristics of the reflection direction on the respective reflection surfaces are different. That is, when light is incident on each reflecting surface from the same direction, the reflecting direction on each reflecting surface is different. In addition, the shape here means the shape of the intersection line with the longitudinal section parallel to the optical axis direction. A vertical section parallel to the optical axis direction refers to a plane that passes through the center of the light emitting element and is parallel to the optical axis direction. Therefore, by appropriately selecting the shapes of the rear side reflection surface and the front side reflection surface, it is possible to appropriately control the reflection direction of the emitted light from the light emitting surface on the side surface of the light emitting element. Further, light emitted from the front surface on the front side in the optical axis direction of the light emitting element is emitted with an inclination with respect to the optical axis direction at the light reflecting portion, rather than the position on the front surface in the optical axis direction of the light emitting element. The reflection direction is controlled by a reflection surface located on the front side in the optical axis direction.

  As described above, the light emitted from the emission surface on the side surface of the light emitting element is appropriately controlled, so that the utilization efficiency of the light emitted from the light emitting layer of the light emitting element is improved and the luminance of the light emitting light source is improved and the luminance is increased. Can be made uniform.

  According to a preferred embodiment of the present invention, the reflecting surface is formed individually corresponding to the emitting surface. Here, forming the reflecting surface corresponding to the emitting surface means forming the reflecting surface so that light emitted from the emitting surface in a direction perpendicular to the emitting surface is incident. In this embodiment, the light emitted from each light emitting surface is incident on the correspondingly formed reflecting surface, and the reflection direction is controlled. Thus, since the emitted light from each light emitting surface is controlled individually, the utilization efficiency of the light emitted from the light emitting layer of the light emitting element can be further improved. Thereby, it is possible to further improve the luminance of the light emitting light source and make the luminance uniform.

According to another embodiment of the present invention, a light guide member that is formed so that light emitted from the light emitting element is incident thereon and has a light emitting portion on the front side in the optical axis direction,
A reflective member disposed on the rear side in the optical axis direction with respect to the light guide member,
The light emitting portion of the light guide member transmits a light emitted from the light emitting element and emits the light to the outside of the light guide member, and totally reflects the light emitted from the light emitting element to reflect the reflection member. And a total reflection region that transmits the light reflected by the reflecting member and emits the light to the outside of the light guide member.

  In this embodiment, at least a part of the light emitted from the light emitting element can be reflected between the total reflection region and the reflecting member in the light emitting portion of the light guide member to control the traveling direction. As a result, it is possible to appropriately control light traveling in an oblique direction with respect to the optical axis direction among the light emitted from the light emitting element.

The emission surface formed on the light-emitting element includes an end surface of the light-emitting layer, a front-side emission surface formed perpendicular to the surface of the light-emitting layer, and a rear side in the optical axis direction of the front-side emission surface A rear side emission surface formed to be inclined from the end toward the rear side in the optical axis direction and toward the inside of the light emitting element;
The rear reflective surface corresponds to the rear outgoing surface, the front reflective surface corresponds to the front outgoing surface,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. It is located on the front side of the surface position.

  In this configuration, since the front side end of the rear side reflection surface is located on the rear side of the position of the rear side end of the front side emission surface, the emitted light emitted from the rear side emission surface, The outgoing light that is mainly incident on the rear reflecting surface and emitted from the front emitting surface can be mainly incident on the front reflecting surface. In addition, since the front end of the front reflective surface is located on the front side of the front surface of the light emitting element, the output emitted from the front emission surface toward the front side in the optical axis direction. The incident light can also be incident on the front reflecting surface. Therefore, it is possible to appropriately control the traveling direction of the emitted light from the side surface of the light emitting element by appropriately selecting the shapes of the rear side reflection surface and the front side reflection surface. Accordingly, it is possible to improve the utilization efficiency of light emitted from the light emitting layer of the light emitting element, and to improve the luminance of the light emitting light source and make the luminance uniform.

  Further, the rear side reflection surface is formed so that an intersecting line with the vertical section is a straight line extending at a first inclination angle with respect to the installation surface of the light emitting element, and the front side reflection surface is the vertical section. May be formed to be a straight line extending at a second inclination angle different from the first inclination angle with respect to the installation surface.

In this configuration, the reflecting surface is formed so that the intersecting line with the longitudinal section parallel to the optical axis direction is a straight line, so that it can be easily implemented.
In addition, the back side reflection surface is formed so that a crossing line with the vertical cross section becomes a curve, and the front side reflection surface has a cross line with the vertical cross section that is a cross line of the back side reflection surface. You may make it form so that it may become a different curve.

  In this configuration, the reflecting surface is formed so that the intersecting line with the longitudinal section becomes a curve, so that not only the light exiting in the direction perpendicular to the exit surface but also the light exiting in the oblique direction with respect to the exit surface. The reflection direction can also be controlled appropriately. Therefore, it is possible to further improve the utilization efficiency of the light emitted from the light emitting layer of the light emitting element, and to further improve the luminance of the light emitting light source and make the luminance uniform.

The emission surface formed on the light-emitting element includes an end surface of the light-emitting layer, a front-side emission surface formed perpendicular to the surface of the light-emitting layer, and a rear side in the optical axis direction of the front-side emission surface A rear side emission surface formed to be inclined from the end toward the rear side in the optical axis direction and toward the inside of the light emitting element;
The rear reflecting surface is formed so that an intersecting line with the longitudinal section corresponds to the rear emitting surface and is a straight line extending at a first inclination angle with respect to the light emitting element installation surface. The reflecting surface is formed so that an intersection line with the longitudinal section corresponds to the front-side emitting surface and is a straight line extending at a second inclination angle larger than the first inclination angle with respect to the installation surface,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. You may make it located in the front side rather than the surface.

  In this configuration, outgoing light emitted from the rear side outgoing surface is mainly incident on the rear side reflective surface, and outgoing light emitted from the front side outgoing surface is mainly incident on the front side reflective surface. Therefore, it is possible to appropriately control the emitted light from the side surface of the light emitting element by appropriately selecting the inclination angles of the rear side reflection surface and the front side reflection surface. In this configuration, by making the second inclination angle of the front reflection surface larger than the first inclination angle of the rear reflection surface, the light reflected by the front reflection surface is separated from the light emitting element across the front of the light emitting element. Thus, it can be advanced in an oblique direction with respect to the optical axis direction. The traveling direction of the light traveling in the oblique direction is controlled by being reflected between the total reflection region and the reflecting member in the light emitting portion of the light guide member. Accordingly, it is possible to improve the utilization efficiency of light emitted from the light emitting layer of the light emitting element, and to improve the luminance of the light emitting light source and make the luminance uniform.

The emission surface formed on the light-emitting element includes an end surface of the light-emitting layer, a front-side emission surface formed perpendicular to the surface of the light-emitting layer, and a rear-side end in the optical axis direction of the front-side emission surface A rear-side emission surface formed at a predetermined angle toward the rear side in the optical axis direction from the portion and toward the inside of the light-emitting element,
The rear-side reflection surface is connected to a tip portion of a step portion formed from the light-emitting element installation surface toward the front side in the optical axis direction, and corresponds to the rear-side emission surface and the longitudinal section. An intersection line is formed to be a straight line extending at a first inclination angle with respect to the installation surface, and the front-side reflection surface corresponds to the front-side emission surface, and the intersection line with the longitudinal section is the installation surface. Is formed to be a straight line extending at a second inclination angle larger than the first inclination angle,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. You may make it located in the front side rather than the surface.

  In this configuration, outgoing light emitted from the rear side outgoing surface is mainly incident on the rear side reflective surface, and outgoing light emitted from the front side outgoing surface is mainly incident on the front side reflective surface. Therefore, it is possible to appropriately control the emitted light from the side surface of the light emitting element by appropriately selecting the inclination angles of the rear side reflection surface and the front side reflection surface. In this configuration, the rear side reflection surface is formed by connecting to the tip of the stepped portion formed on the installation surface, so that the rear side reflection surface of the rear side reflection surface is compared with the case where the rear side reflection surface is formed directly from the installation surface. Since 1 inclination angle becomes small, the light reflected by the back side reflective surface can be advanced in the oblique direction with respect to the optical axis direction so as to leave the light emitting element without crossing the front of the light emitting element. The traveling direction of the light traveling in the oblique direction is controlled by being reflected between the total reflection region and the reflecting member in the light emitting portion of the light guide member. Accordingly, it is possible to improve the utilization efficiency of light emitted from the light emitting layer of the light emitting element, and to improve the luminance of the light emitting light source and make the luminance uniform.

The emission surface formed on the light-emitting element includes an end surface of the light-emitting layer, a front-side emission surface formed perpendicular to the surface of the light-emitting layer, and a rear-side end in the optical axis direction of the front-side emission surface A rear-side emission surface formed at a predetermined angle toward the rear side in the optical axis direction from the portion and toward the inside of the light-emitting element,
The rear reflecting surface is formed so that a cross line with the longitudinal section is curved corresponding to the rear emitting surface, and the front reflecting surface corresponds to the front emitting surface. Formed so that the line of intersection with the surface is a different curve from the line of intersection of the rear reflective surface,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. You may make it located in the front side rather than the surface.

  In this configuration, the front-side reflection surface and the rear-side reflection surface are formed so that the intersecting line with the longitudinal section is a curve, so that the light is emitted in a direction perpendicular to the emission surfaces of the front-side emission surface and the rear-side emission surface. It is possible to appropriately control the reflection direction of not only the light to be emitted but also the light emitted in an oblique direction with respect to each emission surface. As a result, the utilization efficiency of light emitted from the light emitting layer of the light emitting element can be further improved, and the luminance of the light emitting light source can be further improved and the luminance can be made uniform.

  According to another embodiment of the present invention, the recess is filled with a resin in which a phosphor that is excited by light from the light emitting element and emits predetermined color light is stirred. In this embodiment, it is possible to emit the color light obtained by mixing the color light emitted from the light emitting element and the color light emitted from the phosphor excited by the light from the light emitting element. For example, white light can be obtained by using a light emitting element that emits blue light and a phosphor that emits yellow light. White light can also be obtained by using a light emitting element that emits ultraviolet light and three kinds of phosphors that emit red light, green light, and blue light, respectively. Thus, by appropriately selecting and combining the color of the light emitted from the light emitting element and the color of the light emitted from the phosphor stirred by the resin, variations in the color of the light emitted from the light emitting light source can be increased.

ADVANTAGE OF THE INVENTION According to this invention, while improving the utilization efficiency of the light which the light emitting layer of a light emitting element emits, it becomes possible to aim at a brightness improvement and the uniformity of a brightness | luminance.
According to a preferred embodiment of the present invention, a plurality of light exit surfaces are formed on the side surface of the light emitting element, and reflection surfaces corresponding to the respective light exit surfaces are individually formed. The reflection direction of the incident light can be controlled more appropriately. As a result, it is possible to further improve the utilization efficiency of the light emitted from the light emitting layer of the light emitting element, and to further improve the luminance and make the luminance uniform.

  Moreover, according to another embodiment of the present invention, since the light guide member into which the light emitted from the light emitting element is incident, and the reflection member disposed on the rear side in the optical axis direction with respect to the light guide member, It is possible to control the traveling direction by reflecting light emitted from the light emitting element, particularly light emitted obliquely with respect to the optical axis direction, between the total reflection region of the light guide member and the reflecting member.

  Further, according to another embodiment of the present invention, the resin in which the phosphor that is excited by the light from the light emitting element and emits predetermined color light is stirred is filled in the recess in which the light emitting element is installed. The color of light emitted from the light emitting element and the color of light emitted from the phosphor stirred by the resin can be appropriately selected and combined. Thereby, the variation of the color of the light which a light emission light source emits can be increased.

(First embodiment)
FIG. 1 is a cross-sectional view illustrating a schematic configuration of a light-emitting light source 1 according to a first embodiment of the present invention, and FIG. 2 is a side view illustrating a schematic structure of a light-emitting element 2 used in the light-emitting light source 1.

  As shown in FIG. 1, the light-emitting light source 1 includes a light-emitting element 2 and a pair of lead frames 3 and 4 made of a conductive material. One lead frame 3 as a support member is configured by forming a tray portion 3b at one end of a rod-shaped lead portion 3a, and a recess portion 5 is formed in the tray portion 3b. The recess 5 has a flat bottom surface 5a and is formed so that the bottom surface 5a and the opening surface 5b are parallel to each other. The opening surface 5b is a virtual plane at a portion where the concave portion 5 and the surface of the lead frame 3 on which the concave portion 5 is formed intersect. Moreover, the recessed part 5 is formed in the top view circular shape. And in the recessed part 5, the light reflection part 6 is formed by forming a metal film in the surface, for example. The other lead frame 4 is formed in a rod shape.

  As shown in FIG. 2, the light emitting element 2 is configured by laminating a plurality of layers including the light emitting layer 7, and two emission surfaces A and B are formed on the side surface of the light emitting element 2. The light emitting element 2 is formed in a rectangular shape when viewed from above, and is installed in the recess 5 so that the light emitting layer 7 is parallel to the bottom surface 5 a of the recess 5. In the light emitting light source 1, a direction perpendicular to the surface of the light emitting layer 7 and toward the opening surface 5 b side of the recess 5 is defined as an optical axis direction F. The emission surface A is formed perpendicular to the surface of the light emitting layer 7 from the end of the front surface 2a in the optical axis direction of the light emitting element 2 toward the bottom surface (installation surface) 5a, and the end surface of the light emitting layer 7 Formed. Hereinafter, the emission surface A is referred to as a front emission surface A. Further, the emission surface B is formed so as to be inclined from the rear end portion 21 in the optical axis direction on the front emission surface A toward the installation surface 5 a side and the inside of the light emitting element 2. Hereinafter, the emission surface B is referred to as a rear emission surface B.

  In addition, on the side surface of the light emitting element 2, not only the emission surfaces A and B but also the surface of the light emitting layer 7 from the rear end portion 22 in the optical axis direction of the rear emission surface B to the rear surface in the optical axis direction of the light emitting element 2. A surface C is formed to extend perpendicularly to the surface. Most of the light from the light emitting layer 7 is totally reflected at the surface C, so that almost no light is emitted from the surface C. Since the light emitted from the surface C is much less than the light emitted from the emission surfaces A and B, the surface C is not used as the emission surface, and a corresponding reflection surface is formed as described later. Absent.

  In the light emitting element 2, electrodes are located on two surfaces facing each other with the light emitting layer 7 interposed therebetween, that is, the front surface 2a in the optical axis direction and the rear surface in the optical axis direction. Therefore, by installing the light emitting element 2 on the installation surface 5 a of the recess 5, one side electrode located on the installation surface 5 a side is electrically connected to the lead frame 3. The other electrode located on the opening surface 5 b side is electrically connected to one end portion of the other lead frame 4 by a bonding wire 8. The end of the lead frame 3 on the tray 3b side and the end of the lead frame 4 on the bonding wire 8 side are fixed by being molded with a translucent mold resin. The light guide member 9 is formed by molding the mold resin into a predetermined shape. Therefore, the mold resin constituting the light guide member 9 is also filled in the recess 5, and the light emitted from the light emitting element 2 immediately enters the light guide member 9 and travels inside the light guide member 9. become.

  In the light emitting light source 1, by applying current / voltage to the lead frames 3, 4, the applied current / voltage is applied to the light emitting element 2, and light is emitted from the light emitting layer 7. In the light emitting source 1, the light emitted from the light emitting element 2 is directly emitted from the opening surface 5 b of the recess 5, and is reflected by the light reflecting portion 6 formed in the recess 5 and is emitted from the opening surface 5 b of the recess 5. The light emitting element 2 emits light from the front surface 2a in the optical axis direction and also emits light from the side surface as described later. Therefore, most of the light emitted from the front surface 2 a in the optical axis direction of the light emitting element 2 is directly emitted from the opening surface 5 b of the recess 5, and part of the light is reflected by the light reflecting portion 6 and then the opening surface 5 b of the recess 5. Exits from. Further, most of the light emitted from the side surface of the light emitting element 2 is reflected by the light reflecting portion 6 and then emitted from the opening surface 5 b of the recess 5. The light emitted from the opening surface 5 b of the recess 5 is emitted toward the optical axis direction F by the light guide member 9.

  FIG. 3 is a schematic diagram showing the shape of the light reflecting portion 6 in the light emitting light source 1. The light reflecting portion 6 includes a rear side reflection surface R1 and a front side reflection surface R2. The rear-side reflection surface R1 is formed such that an intersecting line with a longitudinal section that is parallel to the optical axis direction F and passes through the center of the light emitting element 2 is a straight line that extends at a first inclination angle θ1 with respect to the installation surface 5a. Further, the front-side reflection surface R2 is connected to the front-side end portion 23 of the rear-side reflection surface R1, and the second inclination in which the intersection line with the longitudinal section is different from the first inclination angle θ1 with respect to the installation surface 5a. It is formed to be a straight line extending at an angle θ2. FIG. 3 shows a case where the first inclination angle θ1> the second inclination angle θ2.

  The rear side reflection surface R1 is a reflection surface formed corresponding to the rear side emission surface B, and the front side reflection surface R2 is a reflection surface formed corresponding to the front side emission surface A. Light exits in various directions from the exit surface, but the most light exits in the direction perpendicular to the exit surface. Here, the formation of the reflection surface corresponding to the emission surface means that the reflection surface is formed at a position where light emitted in a direction perpendicular to the emission surface is incident.

  Here, the optical axis direction distance H1 of the rear side reflection surface R1 is set to be equal to or less than the optical axis direction distance Hd from the installation surface 5a to the rear side end portion 21 of the front side emission surface A. Further, the sum of the optical axis direction distance H1 of the rear side reflection surface R1 and the optical axis direction distance H2 of the front side reflection surface R2 is set to be equal to or greater than the optical axis direction distance Hc of the light emitting element 2. By forming in this way, the front side end portion 23 of the rear side reflection surface R1 is located on the rear side of the position of the rear side end portion 21 of the front side emission surface A, and the front side of the front side reflection surface R2 is located. The end 24 is positioned on the front side of the front surface 2 a of the light emitting element 2.

  In such a light-emitting light source 1, the outgoing light emitted from the rear side outgoing surface B is mainly incident on the rear side reflective surface R <b> 1, and the outgoing light emitted from the front side outgoing surface A is mainly incident on the front side reflective surface R <b> 2. To do. Therefore, by appropriately selecting the inclination angles θ1 and θ2 of the two reflecting surfaces R1 and R2, the reflection direction (traveling direction) of the emitted light from the side surface of the light emitting element 2 can be appropriately controlled. As a result, the utilization efficiency of light emitted from the light emitting layer 7 of the light emitting element 2 can be improved, and the luminance of the light emitting light source 1 can be improved and the luminance can be made uniform.

(Second Embodiment)
FIG. 4 is a schematic diagram for explaining a second embodiment of the present invention. Since the second embodiment has a configuration similar to that of the first embodiment described above, the same configuration is denoted by the same reference numeral, and detailed description thereof is omitted. Since light emitted from the front surface 2a in the optical axis direction of the light emitting element 2 is the same as that in the first embodiment, the light emitted from the side surface of the light emitting element 2 will be described below.

  In 2nd Embodiment, back side reflective surface R1 is formed so that the crossing line with the said longitudinal cross section may become a curve, and also the crossing line with the said vertical cross section differs from the crossing line of the back side reflective surface R1. Thus, the front-side reflection surface R2 is formed. The reflecting surfaces R1 and R2 have a coordinate axis passing through the center of the light emitting element 2 and parallel to the optical axis direction F as a z axis, and two coordinate axes orthogonal to each other in a plane perpendicular to the optical axis direction F as an x axis and a y axis, respectively. , The coordinate points P1 and P2 on the z-axis can be used as reference points to form a curved surface shape.

  By forming the reflecting surfaces R1 and R2 into curved surfaces in this way, as shown in FIG. 5, the strongest light emitted from the emission surfaces A and B, that is, emitted in a direction perpendicular to the emission surfaces A and B. The reflection direction of light other than light can also be controlled appropriately. As a result, the utilization efficiency of light emitted from the light emitting layer 7 of the light emitting element 2 can be further improved, and the luminance of the light emitting light source 1 can be further improved and the luminance can be made uniform.

As the shapes of the reflecting surfaces R1 and R2, it is preferable to use a conic surface or a biconic surface which is an aspherical shape represented by the following formula.
The conic surface is expressed by the following formula (1).

バイコニック面は、以下の数式（２）で表わされる。

The biconic surface is expressed by the following formula (2).

ここで、バイコニック面のＸＺ平面における断面の形状をＺ＝ｇ１（Ｘ）と表すとき、この曲線の曲率をｃｖ、コーニック係数をｃｃとし、ＹＺ平面における断面の形状をＺ＝ｇ２（Ｙ）と表すとき、この曲線の曲率をｃｖｘ（≠ｃｖ）、コーニック係数をｃｃｘとしている。また、ａ，ｂ，ｃ，ｄは、いずれも高次項の係数である。

Here, when the cross-sectional shape in the XZ plane of the biconic surface is expressed as Z = g1 (X), the curvature of this curve is cv, the conic coefficient is cc, and the cross-sectional shape in the YZ plane is Z = g2 (Y). When expressed, the curvature of this curve is cvx (≠ cv) and the conic coefficient is ccx. Also, a, b, c, and d are all higher-order term coefficients.

(Third embodiment)
FIG. 6 is a schematic view showing the main part of the third embodiment of the present invention, and FIG. 7 is a cross-sectional view showing a schematic configuration of the light emitting source 1 according to the third embodiment. The third embodiment has a configuration similar to that of the above-described first embodiment, and the same configuration is denoted by the same reference numeral and detailed description thereof is omitted. Since light emitted from the front surface 2a in the optical axis direction of the light emitting element 2 is the same as that in the first embodiment, the light emitted from the side surface of the light emitting element 2 will be described below.

  In the third embodiment, the inclination angle θ2 of the front reflection surface R2 is set to be larger than the inclination angle θ1 of the rear reflection surface R1, the light guide member 9 is formed in a specific shape, and the light guide member 9 is further formed. The reflecting member 10 is arranged so as to face the emission part. As shown in FIG. 7, the light guide member 9 includes light emitting portions 9 a and 9 b on the front side in the optical axis direction F. The light emitting portion 9a is a substantially hemispherical portion formed on the front side in the optical axis direction F of the light emitting element 2, and the light emitting portion 9b is a plane formed in a substantially annular shape around the substantially hemispherical portion 9a. Part. The light emitting portion 9 a that is a substantially hemispherical portion is a direct emission region that transmits light emitted from the light emitting element 2 and emits the light to the outside of the light guide member 9. The light emitting portion 9b, which is a plane portion formed in a substantially annular shape around the light emitting portion 9a, totally reflects the light emitted from the light emitting element 2 and directs it toward the reflecting member 10, and also reflects the reflecting member. This is a total reflection region in which the light reflected by 10 is transmitted and emitted to the outside of the light guide member 9.

  In the third embodiment, the front-side reflection surface R2 is formed at a position facing the end surface of the light-emitting layer 7 of the light-emitting element 2, and the second tilt angle θ2 is set to a relatively large angle close to 90 degrees. The reflected light from the front-side reflection surface R2 can travel in an oblique direction with a relatively large inclination angle with respect to the optical axis direction F so as to cross the front of the light emitting element 2 and away from the light emitting element 2. For example, in order for light emitted perpendicularly from the front-side emission surface A to be totally reflected by the total reflection region 9b after being reflected by the front-side reflection surface R2, 2θ2−90 ° ≧ arcsin (1 / n) is satisfied. The second inclination angle θ2 may be set. Here, n is the refractive index of the light guide member 9 with respect to the air. However, in order for the light emitted perpendicularly from the front emission surface A and reflected by the front reflection surface R2 to reach the total reflection region 9b before reaching the reflection member 10, the second inclination angle θ2 is large. It doesn't have to be too much. That is, the arrival position in the horizontal direction (perpendicular to the optical axis direction F) when the arrival distance of the reflected light in the optical axis direction F is L is located inside the outer peripheral edge of the light guide member 9. In addition, the second inclination angle θ2 is selected, and the sizes and shapes of the light guide member 9 and the reflection member 10 are appropriately designed.

  The light traveling away from the light emitting element 2 as described above is reflected between the total reflection region 9 b and the reflection member 10 in the light emitting portion of the light guide member 9, and the traveling direction thereof is controlled. In this way, by controlling the traveling direction of the light leaving the light emitting element 2 with the light guide member 9, it is possible to improve the luminance of the peripheral portion of the light guide member 9.

  The light reflected by the front reflective surface R2 is appropriately set with the second inclination angle θ2, the distance L from the light emitting layer 7 to the total reflection region 9b of the light emitting element 2, and the shape of the reflective surface of the reflective member 10. By doing so, the traveling direction can be controlled so as to be emitted from the peripheral portion of the light guide member 9. The shape of the reflecting surface of the reflecting member 10 is preferably the above-described conic surface or biconic surface.

  The graph shown in FIG. 7 shows the relationship between the position of the light guide member 9 on the emission part and the luminance. In this graph, the solid line L1 indicates the luminance characteristic when there is one reflecting surface as in the prior art, and the dotted line L2 indicates the luminance characteristic when there are a plurality of reflecting surfaces as in this embodiment. ing. As can be seen from this graph, in the present embodiment, in addition to the luminance intensity at the peripheral portion of the light guide member 9, the luminance intensity at the central portion is also improved. As described above, in the present embodiment, it is possible to improve the utilization efficiency of light emitted from the light emitting layer 7 of the light emitting element 2 and to improve the luminance of the light emitting light source 1 and make the luminance uniform.

  Further, since the second inclination angle θ2 of the front-side reflection surface R2 is larger than the first inclination angle θ1 of the rear-side reflection surface R1, compared to the case where the second inclination angle θ2 is smaller than the first inclination angle θ1, The diameter φ of the recess 5 can be reduced (see FIG. 6). As a result, the lead frame 3 can be reduced in size.

(Fourth embodiment)
FIG. 8 is a schematic view showing a main part of a fourth embodiment of the present invention, and FIG. 9 is a cross-sectional view showing a schematic configuration of a light emitting source 1 according to the fourth embodiment. The fourth embodiment has a configuration similar to that of the above-described third embodiment, and the same configuration is denoted by the same reference numeral and detailed description thereof is omitted. Since light emitted from the front surface 2a in the optical axis direction of the light emitting element 2 is the same as that in the first embodiment, the light emitted from the side surface of the light emitting element 2 will be described below.

  In the fourth embodiment, the rear-side reflecting surface R1 is connected to the tip end portion of the step portion 15 formed from the installation surface 5a toward the front side in the optical axis direction F, and an intersecting line with the longitudinal section is formed. It is formed to be a straight line extending at a first inclination angle θ1 with respect to the installation surface 5a. The front-side reflection surface R2 is connected to the front-side end portion 23 of the rear-side reflection surface R1, and the second inclination whose intersection line with the longitudinal section is larger than the first inclination angle θ1 with respect to the installation surface 5a. It is formed to be a straight line extending at an angle θ2. In addition, the light guide member 9 is formed in a specific shape, and the reflection member 10 is disposed so as to face the light emitting portion of the light guide member 9.

  In the fourth embodiment, the rear reflection surface R1 is formed so as to extend from the tip of the step portion 15 to the front side in the optical axis direction, so that the first inclination angle θ1 is set as compared with the case where the rear reflection surface R1 is formed from the installation surface 5a. Can be small. That is, as shown in FIG. 8, the first inclination angle θ1 in the present embodiment is smaller than the first inclination angle θ1a when the rear side reflection surface R1 is formed from the installation surface 5a. As a result, the reflected light from the rear-side reflecting surface R1 can be advanced in an oblique direction with respect to the optical axis direction so as to be away from the light emitting element 2 without traversing the front of the light emitting element 2. Similarly to the third embodiment, the front-side reflection surface R2 is formed at a position facing the end surface of the light-emitting layer 7 of the light-emitting element 2, and the second inclination angle θ2 is set to a relatively large angle close to 90 degrees. By doing so, the light reflected by the front-side reflection surface R2 can travel in an oblique direction with a relatively large inclination angle with respect to the optical axis direction F so as to cross the front of the light-emitting element 2 and away from the light-emitting element 2. it can.

  Thus, the light reflected by the rear reflective surface R1 and the front reflective surface R2 and leaving the light emitting element 2 is reflected between the total reflection region 9b and the reflective member 10 in the light emitting portion of the light guide member 9. By doing so, the traveling direction is controlled. Thereby, the brightness of the peripheral portion of the light guide member 9 can be improved.

  The graph shown in FIG. 9 shows the relationship between the position of the light guide member 9 on the exit surface and the luminance. In this graph, the thin solid line L1 indicates the luminance characteristic when there is one reflecting surface as in the conventional technique, and the dotted line L2 indicates the luminance characteristic when there are a plurality of reflecting surfaces, and is thick. A solid line L3 indicates luminance characteristics when the rear side reflection surface R1 is formed from the tip of the step portion 15 as in the present embodiment. As can be seen from this graph, in the present embodiment, the luminance intensity at the peripheral portion of the light guide member 9 is improved as compared with the case where the step portion 15 is not formed. Furthermore, in this embodiment, since the intensity of the luminance in the central portion of the light guide member 9 is reduced as compared with the case where the step portion 15 is not formed, the difference between the minimum value and the maximum value of the luminance is reduced. Is made uniform. As described above, in the present embodiment, it is possible to improve the utilization efficiency of light emitted from the light emitting layer 7 of the light emitting element 2 and to improve the luminance of the light emitting light source 1 and make the luminance uniform.

  Further, since the second inclination angle θ2 of the front-side reflection surface R2 is larger than the first inclination angle θ1 of the rear-side reflection surface R1, compared to the case where the second inclination angle θ2 is smaller than the first inclination angle θ1, The diameter φ of the recess 5 can be reduced (see FIG. 8). As a result, the lead frame 3 can be reduced in size.

(Fifth embodiment)
FIG. 10 is a schematic diagram showing a fifth embodiment of the present invention. Since the fifth embodiment is similar to the third embodiment described above, the same components are denoted by the same reference numerals and detailed description thereof is omitted.

  In the fifth embodiment, the recess 11 is filled with a resin 11 in which a phosphor that is excited by light from the light emitting element 2 and emits predetermined color light is agitated. In this configuration, it is possible to emit color light obtained by mixing the color light emitted from the light emitting element 2 and the color light emitted from the phosphor. For example, white light can be obtained by using the light emitting element 2 that emits blue light and filling the recess 11 with the resin 11 in which the phosphor that emits yellow light is stirred. Further, white light can also be obtained by filling the recess 5 with a resin 11 in which a light emitting element that emits ultraviolet light and three types of phosphors that respectively emit red light, green light, and blue light are stirred. . As described above, by appropriately selecting and combining the color of the light emitted from the light emitting element 2 and the color of the light emitted from the phosphor stirred by the resin 11, variations in the color of the light emitted from the light emitting light source 1 are increased. Can do.

  In each of the embodiments described above, the concave portion 5 is formed to have a circular shape when viewed from above, but may be formed to have a rectangular shape when viewed from above corresponding to the shape of the light emitting element 2. Further, although the light emitting element 2 is formed in a rectangular shape in a top view, it may be formed in a circular shape in a top view corresponding to the shape of the recess 5.

  Further, the light emitting element 2 can be inverted, that is, installed in the recess 5 so that the emission surface A is located on the installation surface 5a side. Furthermore, although the emission surface formed on the side surface of the light emitting element 2 is formed in a flat shape, it may be formed in a curved surface shape.

  Further, although the light guide member 9 is formed by filling the mold resin constituting the light guide member 9 into the recess 5, the rear surface of the light guide member 9 is recessed without filling the mold resin into the recess 5. Alternatively, the light guide member 9 may be formed so as to coincide with the opening surface 5b.

  In addition, although several embodiment was described, description of these embodiment is only an illustration and does not limit the scope of the present invention. In addition, the components described in the embodiments can be combined as much as possible.

  The light-emitting light source of the present invention can be applied to a light-emitting device, a lighting device, a display device, and the like. Since the light-emitting light source of the present invention is relatively thin, it can be used by being embedded in, for example, a wall or furniture, particularly when used in a lighting device. In addition, since the light emission source of the present invention has little luminance unevenness, uniform illumination is possible when used in an illumination device, and easy-to-see display can be realized when used in a display device.

1 is a cross-sectional view illustrating a schematic configuration of a light emission source 1 according to a first embodiment. 1 is a side view showing a schematic structure of a light emitting element 2 used in a light emitting light source 1. The schematic diagram which shows the shape of the light reflection part 6 in the light emission light source 1. FIG. The schematic diagram for demonstrating 2nd Embodiment of this invention. The schematic diagram which shows the aspect of the emitted light control in 2nd Embodiment. The schematic diagram which shows the principal part of 3rd Embodiment of this invention. Sectional drawing which shows schematic structure of the light emission source 1 which is 3rd Embodiment. The schematic diagram which shows the principal part of 4th Embodiment of this invention. Sectional drawing which shows schematic structure of the light emission source 1 which is 4th Embodiment. The schematic diagram which shows 5th Embodiment of this invention. The schematic diagram for demonstrating a prior art. The schematic diagram for demonstrating a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Light emitting light source, 2 ... Light emitting element, 2a ... Optical axis direction front side surface, 3, 4 ... Lead frame, 5 ... Recessed part, 5a ... Bottom surface (installation surface), 5b ... Opening surface, 6 ... Light reflection part, 7 DESCRIPTION OF SYMBOLS ... Light emitting layer, 8 ... Bonding wire, 9 ... Light guide member, 9a ... Light emission part (direct emission area), 9b ... Light emission part (total reflection area) 10 ... Reflective member, 11 ... Resin, 15 ... Step part 21, 22 ... optical axis direction rear side end, 23, 24 ... optical axis direction front side end, A ... front side emission surface, B ... rear side emission surface, F ... optical axis direction, R 1 ... rear side reflection surface , R2 ... front-side reflecting surface, θ1 ... first inclination angle, θ2 ... second inclination angle.

Claims (10)

A light-emitting element configured by laminating a plurality of layers including a light-emitting layer; and a support member having a concave portion and having a light reflecting portion formed in the concave portion, and emitting light emitted from the light-emitting element in the concave portion. In the light emitting light source configured to emit directly from the opening surface and reflect from the light reflecting portion formed in the recess and emit from the opening surface of the recess,
The direction perpendicular to the surface of the light emitting layer and toward the opening surface side of the recess is the optical axis direction,
On the side surface of the light emitting element, at least two emission surfaces having different shapes of intersecting lines with a longitudinal section parallel to the optical axis direction are formed,
The light reflecting portion is configured by connecting a plurality of reflecting surfaces having mutually different shapes of intersecting lines with the longitudinal section, and is located on the rearmost side with respect to the optical axis direction among the plurality of reflecting surfaces. The light-emitting light source, wherein the rear-side reflection surface and the front-side reflection surface connected to the rear-side reflection surface are connected rearward from the position of the front-side surface in the optical axis direction of the light-emitting element. The light-emitting light source according to claim 1,
The light-emitting light source is characterized in that the reflection surface is formed individually corresponding to the emission surface. The light-emitting light source according to claim 1 or 2,
A light guide member that is formed so that light emitted from the light emitting element is incident thereon, and has a light emitting portion on the front side in the optical axis direction;
A reflective member disposed on the rear side in the optical axis direction with respect to the light guide member,
The light emitting portion of the light guide member transmits a light emitted from the light emitting element and emits the light to the outside of the light guide member, and totally reflects the light emitted from the light emitting element to reflect the reflection member. And a total reflection region that transmits the light reflected by the reflecting member and emits the light to the outside of the light guide member. The light-emitting light source according to claim 2,
The light emitting surface formed on the light emitting element includes an end surface of the light emitting layer, a front light emitting surface formed perpendicular to the surface of the light emitting layer, and a rear side end portion in the optical axis direction of the front light emitting surface. From the rear side of the optical axis direction and the rear side emission surface formed to be inclined toward the inside of the light emitting element,
The rear reflective surface corresponds to the rear outgoing surface, the front reflective surface corresponds to the front outgoing surface,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. A light emitting source characterized by being positioned in front of a surface position. The light-emitting light source according to claim 4,
The back-side reflection surface is formed so that an intersection line with the longitudinal section is a straight line extending at a first inclination angle with respect to the light-emitting element installation surface, and the front-side reflection surface is A light-emitting light source characterized in that an intersection line is formed to be a straight line extending at a second inclination angle different from the first inclination angle with respect to the installation surface. The light-emitting light source according to claim 4,
The back side reflection surface is formed such that a cross line with the vertical cross section becomes a curve, and the front side reflection surface has a cross line with the vertical cross section different from a cross line of the back side reflection surface. A light emitting source characterized by being formed so as to become. The light-emitting light source according to claim 3,
The light emitting surface formed on the light emitting element includes an end surface of the light emitting layer, a front light emitting surface formed perpendicular to the surface of the light emitting layer, and a rear side end portion in the optical axis direction of the front light emitting surface. From the rear side of the optical axis direction and the rear side emission surface formed to be inclined toward the inside of the light emitting element,
The rear reflecting surface is formed so that an intersecting line with the longitudinal section corresponds to the rear emitting surface and is a straight line extending at a first inclination angle with respect to the light emitting element installation surface. The reflecting surface is formed so that an intersection line with the longitudinal section corresponds to the front-side emitting surface and is a straight line extending at a second inclination angle larger than the first inclination angle with respect to the installation surface,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. A light emitting source characterized by being positioned in front of the surface. The light-emitting light source according to claim 3,
The light emitting surface formed on the light emitting element includes an end surface of the light emitting layer, a front light emitting surface formed perpendicular to the surface of the light emitting layer, and a rear side end portion in the optical axis direction of the front light emitting surface. A rear side emission surface formed at a predetermined angle from the rear side in the optical axis direction and toward the inner side of the light emitting element,
The rear-side reflection surface is connected to a tip portion of a step portion formed from the light-emitting element installation surface toward the front side in the optical axis direction, and corresponds to the rear-side emission surface and the longitudinal section. An intersection line is formed to be a straight line extending at a first inclination angle with respect to the installation surface, and the front-side reflection surface corresponds to the front-side emission surface, and the intersection line with the longitudinal section is the installation surface. Is formed to be a straight line extending at a second inclination angle larger than the first inclination angle,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. A light-emitting light source characterized by being positioned in front of the surface. The light-emitting light source according to claim 3,
The light emitting surface formed on the light emitting element includes an end surface of the light emitting layer, a front light emitting surface formed perpendicular to the surface of the light emitting layer, and a rear side end portion in the optical axis direction of the front light emitting surface. A rear side emission surface formed at a predetermined angle from the rear side in the optical axis direction and toward the inner side of the light emitting element,
The rear reflecting surface is formed so that a cross line with the longitudinal section is curved corresponding to the rear emitting surface, and the front reflecting surface corresponds to the front emitting surface. Formed so that the line of intersection with the surface is a different curve from the line of intersection of the rear reflective surface,
A front side end of the rear side reflection surface is located rearward of a position of a rear side end of the front side emission surface, and a front side end portion of the front side reflection surface is a front side of the light emitting element. A light-emitting light source characterized by being positioned in front of the surface. In the light emission light source of any one of Claims 1-9,
A light emitting light source, wherein the recess is filled with a resin in which a phosphor that is excited by light from the light emitting element and emits predetermined color light is stirred.

Images