JP2007012792A - Package for light emitting device storage, light source and light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device comprising a light source which can make an irradiated light as a predetermined emitting radiation angle, and a package for the light emitting element storage with the light emitting source. <P>SOLUTION: Since an overhang side 19 is formed facing a top principal surface 13a of a base 13 when a light source 10 provided with a light emitting element 11 is manufactured, if the liquefied precursor of a first light transparent member 16 is injected into a recess, an open face 16a which attends a part for the releasing part of a precursor is brought into contact with the overhang side 19. The quantity of the precursor is adjusted as injected in within the range which is contacted with this overhang side 19. Consequently, the precursor crosses the overhang side 19, and furthermore an open face 16a goes up so as to prevent getting wet and spreading along with the inner circumference face of the recess. The surface shape of the first light transparent member 16 is formed in a desired shape easily. The degree of angle of radiation from the first light transparent member 16 can be made into a desired angle, so that the light flux of the light emitted from the open face 16a of the first light transparent member 16 may be aligned, resulting in enabling light radiant intensity to be made constant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a light emitting element storage package in which a light emitting element is accommodated, a light source that converts the wavelength of light emitted from the light emitting element accommodated in the light emitting element accommodation package and emits the light outward, and a light emitting device including the light source.
In the present invention, the term “substantially parallel” includes parallel.

  FIG. 10 is a cross-sectional view of the conventional light source 1 as seen from the front. A conventional light source 1 is a light source that emits white light by converting light such as near-ultraviolet light and blue light emitted from a light emitting element 2 such as a light emitting diode (abbreviated LED) into a long wavelength by a phosphor 3. It is. Since such a light source 1 is excellent in radiation intensity and heat dissipation characteristics, it is used for illumination. The light source 1 includes a base 4, a light emitting element 2, a mounting portion 5 provided on the base 4 on which the light emitting element 2 is placed, a reflecting member 6 that reflects light emitted from the light emitting element 2, and a phosphor 3. The optical member 7 is included.

  The base 4 is made of an insulator, is formed in a flat plate shape, and is provided with a placement portion 5. The substrate 4 is provided with a wiring conductor (not shown) including a lead terminal and a metallized wiring for electrically connecting the inside and outside of the light source 1, and the lead terminal and the wiring conductor are arranged around the mounting portion 5. To the outside of the light source 1. The substrate 4 is made of an aluminum oxide sintered body (alumina ceramics), an aluminum nitride sintered body, a ceramic such as a mullite sintered body and a glass ceramic, or a resin such as an epoxy resin. When the substrate 4 is made of ceramics, the wiring conductor is formed by firing a metal paste made of tungsten (W), molybdenum (Mo) -manganese (Mn), or the like at a high temperature. When the substrate 4 is made of resin, the lead terminal is made of copper (Cu), iron (Fe) -nickel (Ni) alloy, etc., and is molded integrally with the resin and provided inside the substrate 4.

  The mounting portion 5 is provided for mounting the light emitting element 2 on the upper surface portion 4 a of the base body 4. The wiring conductor arranged around the mounting portion 5 and the light emitting element 2 are electrically connected through an electrical connection means such as a bonding wire or a metal ball.

  The reflecting member 6 is formed in a substantially frame shape, and one end in the axial direction is bonded and fixed to the upper surface portion 4 a of the base 4. The inner peripheral surface 6a of the reflecting member 6 is formed in a tapered shape so as to increase in diameter from one end in the axial direction toward the other end, and the inner peripheral surface 6a reflects the light emitted from the light emitting element 2. It is formed to become. Specifically, the reflecting member 6 is made of metal such as aluminum (Al) and Fe-Ni-cobalt (Co) alloy, ceramics such as alumina ceramics or resin such as epoxy resin, and is processed by cutting, die molding or extrusion. It is formed by a molding technique such as molding. The reflecting surface 6a of the reflecting member 6 is formed by smoothing the inner peripheral surface 6a or by depositing a metal such as Al on the inner peripheral surface 6a by vapor deposition or plating. The reflecting member 6 is made of a solder material such as solder and silver (Ag) solder, or a bonding material such as a resin adhesive, so that the mounting portion 5 is surrounded by the inner peripheral surface 6a of the reflecting member 6 so as to surround the upper main surface 4a of the base 4. To be joined.

  The translucent member 7 includes a phosphor 3 that converts the light emitted from the light emitting element 2 to the longer wavelength side, and is provided inside the reflecting member 6 so as to cover the light emitting element 2. The phosphor 3 converts the wavelength into red, green, blue, yellow, and the like. The translucent member 7 is realized by an epoxy resin or a silicone resin containing the phosphor 3. The translucent member 7 is injected inside the reflecting member 6 so as to cover the light emitting element 2 by an injection machine such as a dispenser, and is thermally cured in an oven.

  Since the light source 1 is configured in this way, the light from the light emitting element 2 is wavelength-converted to the longer wavelength side by the phosphor 3, and light having a desired wavelength spectrum can be extracted (see, for example, Patent Document 1).

JP 2003-37298 A

  In the light source 1 of the prior art, the translucent member 7 is likely to wet and spread so as to scoop up the inner peripheral surface 6a of the reflective member 6 by surface tension, and thereby the translucent member 7 injected into the inside of the reflective member 6. There is a problem that the shape of the upper surface 7a is not stable. This has the following problems. (1) The radiation angle of light emitted from the upper surface of the translucent member cannot be made constant. (2) The luminous flux emitted from the upper surface of the translucent member varies and the radiation intensity cannot be made constant. (3) The optical path length through which the light emitted from the light emitting element passes through the translucent member varies, and the wavelength conversion efficiency cannot be made constant. (4) Radiation intensity, axial luminous intensity, luminance, color rendering, etc. vary from light source to light source, and the characteristics cannot be made substantially equal for each light source. (5) Color unevenness and intensity unevenness occur.

  Accordingly, an object of the present invention is to provide a light source capable of reducing variations in radiation intensity, on-axis luminous intensity, luminance, color rendering, and the like so that the emitted light can have a predetermined radiation angle, and a light-emitting element constituting the light source It is to provide a light emitting device including a storage package and the light source.

The present invention is a light emitting element storage package in which a light emitting element is stored,
A base on which a recess for accommodating the light emitting element is formed;
A light reflecting surface formed on the inner surface portion surrounding the bottom portion of the recess, and having light reflectivity;
A package for housing a light emitting element, comprising an overhanging surface portion provided on the inner surface portion and having an overhanging surface facing the bottom surface portion of the recess.

Further, the present invention is a light emitting element storage package in which a light emitting element is stored,
A base on which a recess for accommodating the light emitting element is formed;
A light emitting element storage package comprising: an extended surface portion provided on an inner surface portion surrounding a bottom surface portion of the recess and having an extended surface facing the bottom surface portion of the recess.

  Furthermore, the present invention is characterized in that the projecting surface of the projecting surface portion and the bottom surface of the bottom surface portion are arranged substantially in parallel.

  Furthermore, the invention is characterized in that a convex portion for forming the protruding surface portion is formed on the inner surface portion.

  Furthermore, the present invention is characterized in that a groove portion for forming the protruding surface portion is formed in the inner surface portion.

Further, according to the present invention, the base includes a pair of base parts that can be connected and separated from each other,
At least one of the overhanging surface portions is formed on one base portion.

Furthermore, the present invention further includes a ring-shaped member provided inside the inner surface portion,
The convex portion is the ring-shaped member.

Furthermore, the present invention provides the light emitting element storage package,
A light emitting element;
A mounting portion provided on a bottom surface portion of the concave portion, on which the light emitting element is mounted;
1st translucent member which has translucency and is provided covering the outer periphery of the said light emitting element mounted in the said mounting part, Comprising: It is provided in contact with the overhang | projection surface of the said overhang | projection surface part. It is a light source characterized by including a 1st translucent member.

  Furthermore, the present invention is characterized by further including a second translucent member having translucency, provided opposite to the first translucent member, and containing a phosphor.

Furthermore, the present invention provides the light emitting element storage package,
A light emitting element;
A mounting portion provided on a bottom surface portion of the concave portion, on which the light emitting element is mounted;
1st translucent member which has translucency and is provided covering the outer periphery of the said light emitting element mounted in the said mounting part, Comprising: It is provided in contact with the overhang | projection surface of the said overhang | projection surface part. A first translucent member;
A second translucent member that has translucency and is formed in a sheet shape containing phosphor, and is provided in contact with the convex portion at a position facing the first translucent member. It is a light source characterized by including.

  Furthermore, the present invention is characterized in that the mounting portion is provided at a position separated from the bottom surface of the concave portion.

  Furthermore, the present invention is characterized in that the second translucent member extends outward from the inner edge of the projecting surface.

  Furthermore, the present invention is characterized in that the second translucent member is provided with a gap between the second translucent member and the first translucent member.

Furthermore, the present invention provides the light source,
A drive unit mounted with the light source and having electrical wiring for driving the light source;
The light emitting device includes light reflecting means for reflecting light emitted from the light source.

  According to the present invention, the light emitting element can be accommodated in the recess formed in the base, and the light emitted from the light emitting element can be reflected by the light reflecting surface. Thereby, the light emitted from the light emitting element can be efficiently emitted from the open portion of the recess. In addition, since an overhanging surface portion having an overhanging surface facing the bottom surface portion of the recess is provided, when manufacturing a light source including a light emitting element, the liquid precursor of the first translucent member having translucency is used as the recess. When injected, the open surface facing the open portion of the precursor contacts the overhanging surface. By adjusting the amount of precursor to be filled within the range of contact with the overhanging surface, the precursor is prevented from exceeding the overhanging surface and further the open surface rising and spreading along the inner surface of the recess. can do. The amount of the precursor to be filled is preferably a constant amount, but even if there is some error, it is possible to prevent undesirably spreading by the protruding surface. Therefore, the surface shape of the first translucent member formed inside the inner surface portion can be easily formed into a desired shape. Accordingly, when light emitted from the light emitting element is emitted from the open surface of the first light transmissive member, the radiation angle can be set to a desired angle, and the light is emitted from the open surface of the first light transmissive member. The luminous flux of the emitted light is aligned, and the light emission intensity can be made constant.

  According to the invention, the light emitting element can be accommodated in the recess formed in the base. Since a projecting surface portion having a projecting surface facing the bottom surface portion of the recess is provided, the liquid precursor of the first translucent member having translucency is filled into the recess when a light source including a light emitting element is manufactured. Then, the open surface that faces the open portion of the precursor contacts the overhanging surface. By adjusting the amount of precursor to be filled within the range of contact with the overhanging surface, the precursor is prevented from exceeding the overhanging surface and further the open surface rising and spreading along the inner surface of the recess. can do. The amount of the precursor to be filled is preferably a constant amount, but even if there is some error, it is possible to prevent undesirably spreading by the protruding surface. Therefore, the surface shape of the first translucent member formed inside the inner surface portion can be easily formed into a desired shape. Accordingly, when light emitted from the light emitting element is emitted from the open surface of the first light transmissive member, the radiation angle can be set to a desired angle, and the light is emitted from the open surface of the first light transmissive member. The luminous flux of the emitted light is aligned, and the light emission intensity can be made constant.

  Furthermore, according to the present invention, the projecting surface of the projecting surface portion and the bottom surface of the bottom surface portion are disposed substantially parallel to each other. It can arrange | position in the position along the virtual plane containing an exit surface. Accordingly, the position of the open surface of the first translucent member can be adjusted with high accuracy, and the characteristics of the light emitted from the light emitting element can be controlled with high accuracy.

  Furthermore, according to the present invention, since the convex portion forming the protruding surface portion is formed on the inner surface portion, it is possible to realize a light emitting element storage package including the protruding surface.

  Further, according to the present invention, since the groove portion forming the protruding surface portion is formed on the inner surface portion, the light emitting element storage package including the protruding surface portion and the virtual plane including the inner peripheral surface is formed flat. Can be realized. Since the virtual plane including the inner surface can be made flat, there is no foreign matter that undesirably blocks the light emitted from the light emitting element, so that the light emitted from the light emitting element can be efficiently emitted outward. it can.

  Further, according to the present invention, at least a protruding surface portion is formed on one base portion. Therefore, even if the shape of the overhanging surface portion is complicated, processing can be facilitated by separating and manufacturing the base portion. As a result, the manufacturing cost can be reduced.

  Furthermore, according to this invention, since the said convex part is a ring-shaped member, it can implement | achieve the light emitting element accommodation package provided with a convex part, without processing an inner surface at all. Accordingly, it is not necessary to perform complicated processing to provide the overhanging surface portion on the inner surface, so that the manufacturing cost can be reduced.

  Furthermore, according to the present invention, the first translucent member has translucency and is provided so as to cover the outer periphery of the light emitting element placed on the placing portion. The light is emitted outward through the first translucent member. The first translucent member is provided in contact with the projecting surface of the projecting surface portion. Therefore, when the light source is manufactured, the liquid precursor of the first translucent member is filled with the precursor until the open surface facing the open portion of the precursor is in contact with the protruding surface. The surface shape of the open surface of the sex member can be easily formed into a desired shape. Accordingly, when light emitted from the light emitting element is emitted from the open surface of the first light transmissive member, the radiation angle can be set to a desired angle, and the light is emitted from the open surface of the first light transmissive member. The luminous flux of the emitted light is aligned, and the light emission intensity can be made constant. Moreover, it is possible to prevent as much as possible individual differences for each light source.

  Furthermore, according to the present invention, since the second light transmissive member has light transmissive properties and is provided to face the first light transmissive member, the second light transmissive member is emitted through the first light transmissive member. Light can be guided outward. Since the second translucent member contains a phosphor, the light emitted from the first translucent member by the phosphor can be converted to a long wavelength and emitted outward, thereby A light source that emits light having a desired wavelength can be realized.

  Furthermore, according to the present invention, the first translucent member has translucency and is provided so as to cover the outer periphery of the light emitting element placed on the placing portion. The light is emitted outward through the first translucent member. The first translucent member is provided in contact with the projecting surface of the projecting surface portion. Therefore, when the light source is manufactured, the precursor of the first translucent member is filled with the precursor until the open surface facing the open portion of the precursor is in contact with the projecting surface. The surface shape of the open surface can be easily formed into a desired shape. Accordingly, when light emitted from the light emitting element is emitted from the open surface of the first light transmissive member, the radiation angle can be set to a desired angle, and the light is emitted from the open surface of the first light transmissive member. The luminous flux of the emitted light is aligned, and the light emission intensity can be made constant. Moreover, it is possible to prevent as much as possible individual differences for each light source.

  The second translucent member has translucency and is provided to face the first translucent member. Therefore, the light emitted through the first translucent member is directed outward. It can be guided. Since the second translucent member contains a phosphor, the light emitted from the first translucent member by the phosphor can be converted to a long wavelength and emitted outward, thereby A light source that emits light having a desired wavelength can be realized. Further, since the second translucent member is formed in a sheet shape, both end surfaces in the thickness direction can be flattened, and the light transmitted in the thickness direction can be prevented from changing undesirably. it can. Since the 2nd translucent member is provided in contact with a convex part, the position of the 2nd translucent member can be fixed easily.

  Furthermore, according to the present invention, since the mounting portion is provided at a position separated from the bottom surface of the recess, the emission range of the light emitted from the light emitting element to the inner surface portion can be widened. Therefore, the amount of light that can be reflected by the light reflecting surface can be increased, and the amount of light emitted from the light emitting device can be increased.

Further, according to the present invention, since the second translucent member extends outward from the inner edge portion of the projecting surface, all the light emitted from the light emitting element is the second translucent member. The light can be emitted outward through the second light transmitting member, and light can be prevented from leaking outside without passing through the second translucent member. Accordingly, the light emitted from the light emitting element can be efficiently emitted to the outside. Further, according to the present invention, the second light transmissive member has a gap between it and the first light transmissive member. Provided. Therefore, since light is incident on the second light-transmissive member having a refractive index larger than that of air from the gap where air having a refractive index smaller than that of the second light-transmissive member exists, the second light-transmissive member Light totally reflected on the incident surface can be reduced.

  Furthermore, according to the present invention, the light source is driven by the driving unit, and the light emitted from the light source is reflected by the light reflecting means. Therefore, the light emitted from the light source can be efficiently used as a light emitting device.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. Portions corresponding to the matters described in the preceding forms in each embodiment are denoted by the same reference numerals, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined if there is no particular problem with the combination.

  FIG. 1 is a sectional view showing a light source 10 according to a first embodiment of the present invention as seen from the front. The light source 10 converts light emitted from the light emitting element 11 (hereinafter, simply referred to as “light from the light emitting element 11”) into a long wavelength by the phosphor 12 and emits the light outward. The light source 10 includes a base 13, a light emitting element 11, a mounting portion 14, a reflecting member 15, a first light transmissive member 16, and a second light transmissive member 17.

  The base 13 is provided with a mounting portion 14 for mounting the light emitting element 11, and a conductive layer 18 to which the electrode of the light emitting element 11 is electrically connected is formed on the mounting portion 14. The base 13 is formed in a flat plate shape, and protrudes upward at the center in the width direction substantially perpendicular to the thickness direction of the upper surface (hereinafter simply referred to as the “upper main surface 13a”). A mounting portion 14 is formed. A conductive layer 18 having conductivity is formed on the upper end surface 14 a of the mounting portion 14, and the light emitting element 11 is electrically connected to the conductive layer 18. Therefore, the portion on which the light emitting element 11 is placed is provided at a position separated from the upper main surface 13a. The base 13 is made of alumina ceramic, aluminum nitride sintered body, mullite sintered body, ceramic such as glass ceramic, resin such as epoxy resin, metal, or the like.

  The mounting portion 14 is formed by removing the periphery of the mounting portion 14 of the base body 13 by means such as cutting, mechanical polishing, and blast polishing, or by mold molding and ceramic green sheet lamination. And can be formed integrally. Or the mounting part 14 may join the member used as the mounting part 14 to the upper side main surface 13a of the base | substrate 13, for example with an adhesive agent.

  As a method of connecting the light emitting element 11 to the conductor layer 18, for example, a method of connecting via wire bonding, or a method using a flip chip bonding method in which the lower surface of the light emitting element 11 is connected by an electric connecting means such as a solder bump. Etc. are used.

  The conductor layer 18 is electrically connected to an external electric circuit board (not shown) provided outside the light source 10 via a wiring conductor (not shown) formed inside the base 13. The conductor layer 18 is realized by, for example, one kind of tungsten (W), molybdenum (Mo), copper (Cu), silver (Ag), or a metal powder metallized layer obtained by mixing these. For the wiring conductor, for example, a lead terminal made of iron (Fe) -nickel (Ni) -cobalt (Co) alloy or the like is embedded in the base 13, one end of the lead terminal is exposed to the mounting portion 14, and the other end is By exposing the light source 10 to the outside, or by fitting and connecting an input / output terminal made of an insulator to a through hole provided in the base 13, or a conductor layer on the surface or inside of the base 13 made of ceramics This is realized by a metallized layer formed in the same manner as the formation of 18.

  A metal having excellent corrosion resistance such as Ni and gold (Au) is preferably deposited on the exposed surface portion of the conductor layer 18 with a thickness of about 1 μm to 20 μm. Specifically, on the exposed surface of the electrical connection pattern, for example, an Ni plating layer having a thickness of about 1 μm to 10 μm and an Au plating layer having a thickness of about 0.1 μm to 3 μm are electroplating or electroless. More preferably, the layers are sequentially deposited by a plating method. As a result, the oxidative corrosion of the conductor layer 18 can be effectively prevented, and the connection between the light emitting element 11 and the conductor layer 18 can be strengthened.

  The reflecting member 15 is formed in a substantially frame shape, and one end portion in the axial direction is bonded and fixed to the upper main surface 13 a portion of the base 13. As a result, the upper main surface 13a of the base body 13 is used as the bottom surface, and the inner peripheral surface portion that is the inner surface portion of the reflection member 15 is configured to surround the bottom surface portion, and the light emitting element 11 is accommodated by the base body 13 and the reflection member 15. A recess is formed. The light emitting element 11 is disposed inside the recess. The reflecting member 15 is formed with a reflecting surface 15a having light reflectivity on an inner peripheral surface portion thereof. The reflecting member 15 is formed on the upper main surface 13a of the base 13 so that the mounting portion 14 is surrounded by the reflecting surface 15a with a bonding material such as solder and a brazing material such as silver (Ag) brazing or a resin adhesive such as an epoxy resin. Be joined. Alternatively, the member can be integrally formed with the base 13 by cutting or the like.

  The reflection member 15 may be provided in any portion as long as it is a remaining portion excluding the mounting portion 14 of the upper main surface 13a of the base 13, but a desired surface accuracy around the light emitting element 11, for example, a light source In 10 longitudinal sections, it is preferable that the reflective surfaces 15a provided on both sides of the light emitting element 11 with the light emitting element 11 in between are symmetrical. In the present embodiment, the inner peripheral surface 15a of the reflecting member 15 is formed in a tapered shape so as to increase in diameter from one end portion in the axial direction toward the other end portion, and the inner peripheral surface 15a emits light emitted from the light emitting element 11. It is formed so as to be a reflection surface 15a that reflects light. In other words, the reflecting surface 15a is formed so that the longitudinal cross-sectional shape is a straight line extending outward as it goes upward.

  The reflecting member 15 is made of metal, ceramics, resin, and the like, and is formed by cutting, molding, or the like. The reflecting surface 15a is not particularly limited as long as it reflects light, but in order to obtain a higher reflectance, the inner peripheral surface serving as the reflecting surface 15a is smoothed by polishing or pressing a mold, or the like. On the inner peripheral surface of the through-hole, a highly reflective metal thin film layer such as Al, Ag, Au, platinum (Pt), titanium (Ti), chromium (Cr) and Cu is formed by plating and vapor deposition, for example. Is realized.

  The arithmetic average roughness Ra of the surface of the reflecting surface 15a is preferably about 0.004 μm or more and 4 μm or less, for example, so that the reflecting surface 15a can reflect light of the light emitting element 11 and the phosphor 12 well. it can. When the arithmetic average roughness Ra exceeds 4 μm, it becomes difficult to uniformly reflect the light of the light emitting element 11, and it becomes easy to diffusely reflect inside the light emitting device 23. On the other hand, when the arithmetic average roughness Ra is less than 0.004 μm, it is difficult to form such a surface stably and efficiently.

  The reflecting member 15 is provided with an overhanging surface portion 20 having an overhanging surface 19 that is provided on the inner surface portion and faces the bottom surface portion of the recess that is one end surface portion in the thickness direction of the base body 13. In the present embodiment, the projecting surface portion 20 is realized by providing the projecting portion 20, which is a convex portion projecting inward from the reflecting surface 15 a, on the inner surface portion of the reflecting member 15 over the entire circumference (hereinafter referred to as a tensioning surface). The exit surface 20 is also referred to as a protrusion 20). As shown in FIG. 1, the protruding portion 20 is provided integrally with the reflecting member 15, and is formed by performing cutting and mold forming when the reflecting member 15 is manufactured. The overhanging surface 19 facing the upper main surface 13a of the protrusion 20 is disposed so as to be substantially parallel to the upper main surface 13a.

  The protrusion dimension L0 of the protrusion 20 is preferably 0.1 mm or more, and may be equal to or less than a quarter of the opening dimension L1 of the reflection surface 15a in the protrusion 20. With this configuration, the on-axis luminous intensity and luminance are more excellent. When the protrusion dimension L0 of the protrusion 20 is less than 0.1 mm, the first translucent member 16 filled inside the reflection member 15 crawls up to the reflection surface 15a above the protrusion 20 to reflect the reflection surface. The inner surface of 15a is more than necessary and spreads more than necessary, and is easily radiated from the reflecting member 15 as light having a uniform on-axis luminous intensity and luminance, and the protruding dimension 10 of the protrusion 20 exceeds 1/4 of the opening dimension L1. When it becomes larger, the light emitted from the light emitting element 11 is blocked by the protrusion 20, and the on-axis luminous intensity and luminance of the light emitted from the reflecting member 15 are likely to decrease. Further, the reflecting member 15 is formed with a stepped step portion 21 on the inner peripheral surface portion above the protruding portion 20. A second translucent member 17 described later is placed on the stepped portion 21.

  The first translucent member 16 has translucency, is provided so as to cover the outer periphery of the light emitting element 11 mounted on the mounting portion 14, and is provided in contact with the protruding surface 19 of the protruding portion 20. . The first translucent member 16 is a transparent member made of transparent resin such as epoxy resin and silicone resin, or sol-gel glass. As shown in FIG. 1, the first translucent member 16 is formed by pouring an uncured liquid material around the light emitting element 11 using an injection machine such as a dispenser and then curing it. The first light transmissive member 16 also has a function of protecting the light emitting element 11. The first translucent member 16 is filled with a liquid material as a precursor in a space where the projecting surface 19 faces the upper main surface 13 a, and the amount thereof is adjusted to an amount in contact with the projecting surface 19. The precursor of the first translucent member 16 indicates that the first translucent member 16 is in a liquid state. For example, when the first translucent member 16 is made of sol-gel glass, the precursor is in the liquid state. In the case of being made of a curable resin, the precursor is the uncured state before curing. Therefore, the open surface 16a opened above the first translucent member 16 and the projecting surface 19 are configured to be substantially parallel. The overhanging surface 19 is arranged so as to be parallel to the upper main surface 13a, but is an inclined surface that is inclined upward as it goes from the reflecting surface 15a to the tip of the inward projection 20. Also good. Thereby, the error of the filling amount of the 1st translucent member 16 can be accept | permitted more widely. The inclination angle is preferably 60 ° or less with respect to the upper main surface 13a.

  The second translucent member 17 has translucency, is provided to face the first translucent member 16, and contains the phosphor 12. The 2nd translucent member 17 contains the fluorescent substance 12 which is excited by the light from the light emitting element 11, and converts into long wavelength fluorescence to transparent resin, such as an epoxy resin and a silicone resin. For example, the second translucent member 17 may be cured by injecting the uncured second translucent member 17 so as to cover the open surface 16a of the first translucent member 16, Preferably, it is formed by cutting a sheet that has been prepared in advance into a predetermined shape. Further, the second translucent member 17 is preferably extended outward from the tip end portion of the protruding portion 20 which is the inner edge portion of the projecting surface 19. In other words, the second translucent member 17 is preferably installed on the inner surface of the reflecting member 15 by being placed on and fixed to the upper side of the protruding portion 20. Specifically, the second translucent member 17 is a sheet-shaped member cut out into a predetermined shape and placed in the stepped portion 21 to be placed at a predetermined position on the reflecting surface 15 a of the reflecting member 15. To be placed flat. Accordingly, the second light transmissive member 17 is provided with a gap between the second light transmissive member 16 and the first light transmissive member 16. In other words, the second translucent member 17 is provided on the first translucent member 16 with an interval in the thickness direction.

  It is important that the second translucent member 17 is formed with a constant thickness and that the phosphors 12 are uniformly dispersed. With this configuration, the light from the light emitting element 11 can be reliably wavelength-converted to the long wavelength side by the phosphor 12 to obtain light having a desired wavelength spectrum. The reflection member 15 installed so as to surround the second light transmissive member 17 can collect the light from the second light transmissive member 17 and make it a radiated light having a desired radiation angle.

  FIG. 2 is a plan view showing the light emitting device 23 including the light source 10. FIG. 3 is a cross-sectional view showing the light emitting device 23 as viewed from the front. The light emitting device 23 includes a light source 10, a light emitting device driving circuit board 22 on which the light source 10 is mounted and having electric wiring for driving the light source 10, and a reflecting plate 24 that reflects light emitted from the light source 10. Composed.

  The light emitting device 23 is provided with a plurality of light sources 10 and can emit a predetermined amount of light by causing the plurality of light sources 10 to emit light. The light-emitting device 23 includes a plurality of light sources 10 arranged in a plurality of rows on a light-emitting device driving circuit board 22 that is a drive unit, and a reflector 24 that is a light reflecting means optically designed in a required shape around the light-emitting device 23. Installed and configured. The plurality of light sources 10 are arranged in a so-called zigzag arrangement in which adjacent rows of light emitting devices 23 are arranged between the plurality of light sources 10 arranged in a row.

  Such a light emitting device 23 is, for example, a general lighting fixture, a chandelier lighting fixture, a residential lighting fixture, an office lighting fixture, a store fixture, an exhibition lighting fixture, or a street lamp lighting fixture used indoors and outdoors. , Guide lights, signal devices, stage and studio lighting, advertising lights, lighting poles, underwater lighting, strobe lights, spotlights, security lights embedded in power poles, emergency lighting, flashlights It is suitably used for backlights for electronic bulletin boards, dimmers, automatic flashers, displays, moving picture devices, ornaments, illuminated switches, optical sensors, medical lights and in-vehicle lights.

  As described above, according to the light source 10 and the light emitting device 23 of the present embodiment, the light emitting element 11 can be accommodated in the recesses formed in the base body 13 and the reflecting member 15 and emitted from the light emitting element 11. Can be reflected by the reflecting surface 15a. Thereby, the light emitted from the light emitting element 11 can be efficiently emitted from the open portion of the recess. Moreover, since the projection part 20 which has the overhang | projection surface 19 which faces the upper side main surface 13a of the base | substrate 13 is provided, when manufacturing the light source 10 provided with the light emitting element 11, of the 1st translucent member 16 which has translucency. When the liquid precursor is injected into the recess, the open surface 16 a facing the open portion of the precursor comes into contact with the overhanging surface 19. By adjusting the amount of the precursor to be filled within the range in contact with the overhanging surface 19, the precursor passes over the overhanging surface 19, and the open surface 16a further rises to wet along the inner peripheral surface portion of the recess. It can be prevented from spreading. The amount of the precursor to be filled is preferably a constant amount, but even if there is a slight error, the protruding surface 19 can prevent undesirably spreading. Therefore, the surface shape of the first translucent member 16 formed inside the inner peripheral surface portion can be easily formed into a desired shape. Accordingly, when light emitted from the light emitting element 11 is emitted from the open surface 16a of the first light transmissive member 16, the radiation angle can be set to a desired angle, and the first light transmissive member 16 The light beams emitted from the open surface 16a are aligned, and the light emission intensity can be made constant.

  Further, the precursor of the first translucent member 16 can be injected into the reflecting member 15 with the protrusion 20 as a mark, improving work efficiency when injecting the precursor using a dispenser or the like. In addition, a predetermined amount of the precursor can be injected almost accurately.

  Further, since the phosphor 12 is contained in the sheet-like second light transmissive member 17, the light emitted from the light emitting element 11 is transmitted through the second light transmissive member 17. Therefore, the wavelength conversion efficiency of the light emitted from the light emitting element 11 can be made constant since the light path length of the light from the light emitting element 11 is constant by the first translucent member 16. it can.

  As a result, the radiant intensity, the axial luminous intensity, the luminance, the color rendering properties, and the like are constant in each light source 10, and it is possible to effectively prevent the occurrence of uneven color and uneven intensity. The light source 10 having excellent light characteristics such as color rendering can be realized.

  In addition, since the mounting portion 14 that protrudes upward is formed at the central portion of the upper main surface 13a of the base body 13, the light emitted downward from the light emitting element 11 is also reflected outward of the light emitting device 23 by the reflecting member 15. Can be made. As a result, it is possible to prevent light from being absorbed by multiple reflection at the mounting portion 14 and the like, and much of the light emitted from the light emitting element 11 can be used as the emitted light from the light source 10. As a result, the light emission characteristics of the light emitting element 11 can be maximized, and the light source 10 having excellent light characteristics such as on-axis luminous intensity, luminance, and color rendering can be realized. Further, the mounting portion 14 protruding from the upper main surface 13a of the base body 13 makes it easy to mount the light emitting element 11 on the mounting portion 14, and the light emitting element 11 can be mounted accurately and easily at a desired position. There is an effect of being able to.

  Further, in the present embodiment, since the overhanging surface 19 and the upper main surface 13a are arranged substantially in parallel, the open surface 16a of the precursor of the first translucent member 16 to be filled is replaced with the overhanging surface 19. It can arrange | position in the position along the containing virtual plane. Thereby, the position of the open surface 16a of the first translucent member 16 can be adjusted with high accuracy, and the characteristics of the light emitted from the light emitting element 11 can be controlled with high accuracy.

  Moreover, since the 2nd translucent member 17 is formed in a sheet form, both end surfaces in the thickness direction can be flattened, and the characteristics of the light transmitted in the thickness direction can be prevented from changing undesirably. Can do. Further, the sheet-like second light-transmissive member 17 is installed so as to be locked onto the protruding portion 20, so that the second light-transmissive member can be accurately and easily placed at a predetermined position of the reflecting member 15. The member 17 can be installed.

  Further, by connecting the light emitting element 11 to the conductor layer 18 by a flip chip bonding method, the conductor layer 18 can be provided immediately below the light emitting element 11, so that a wiring conductor is provided on the upper surface of the base 13 around the light emitting element 11. It is not necessary to provide a space for providing. Therefore, it can suppress that the light from the light emitting element 11 is absorbed by the wiring conductor, and an axial luminous intensity falls.

  Since the reflecting member 15 is provided so that the reflecting surfaces 15a provided on both sides of the light emitting element 11 with the light emitting element 11 sandwiched in the longitudinal section of the light source 10, the light from the light emitting element 11 is secondly transmitted. The phosphor 12 included in the translucent member 17 not only converts the wavelength and directly emits the light to the outside, but also emits light emitted from the light emitting element 11 in the lateral direction and the light emitted downward from the phosphor 12. The reflection surface 15a can uniformly reflect the light. As a result, the on-axis luminous intensity and brightness of the light from the light source 10 and color rendering can be effectively improved. In particular, this effect becomes more prominent as the reflecting member 15 is closer to the mounting portion 14. Therefore, by surrounding the mounting portion 14 with the reflecting member 15, more light can be reflected, and a higher on-axis luminous intensity can be obtained.

Furthermore, in the present embodiment, the second translucent member 17 extends outward from the tip end of the projection 20 that is the inner edge of the overhanging surface 19, and thus is emitted from the light emitting element 11. All the light can be emitted outward through the second light transmissive member 17, and light can be prevented from leaking outside without passing through the second light transmissive member 17. Thereby, the light emitted from the light emitting element 11 can be efficiently emitted outward. Further, in the present embodiment, the second light transmissive member 17 is disposed between the first light transmissive member 16 and the second light transmissive member 17. It is provided with a gap. Accordingly, since light is incident on the second light transmissive member 17 having a refractive index larger than that of air from the gap in which air having a refractive index smaller than that of the second light transmissive member 17 is present, the second light transmissive property is obtained. The light totally reflected by the incident surface of the member 17 can be reduced.

  Further, in the present embodiment, the light emitting device 23 can use the light emitted from the light emitting element 11 made of semiconductor by being used as the light source 10, and the conventional discharge is used by the light emitting element 11 made of semiconductor. The power consumption is lower than that of the light-emitting device, the lifetime can be increased, and the light-emitting device 23 can be further downsized. In addition, since the thickness of the second translucent member 17 containing the phosphor 12 can be made constant, fluctuations in the center wavelength of the light emitted from the light emitting element 11 can be suppressed, and stable radiation intensity over a long period of time. In addition, it is possible to obtain the light-emitting device 23 that can emit light at a radiation angle and that has little color unevenness and uneven illuminance distribution on the irradiated surface.

  Further, the light emitting device 23 obtains a light emitting device 23 that emits light of an arbitrary light distribution by installing a reflector 24, an optical lens, a light diffusion plate, and the like that are optically designed in an arbitrary shape around the light source 10. be able to.

  The arrangement of the plurality of light sources 10 provided in the light emitting device 23 is such that when the light sources 10 are arranged in a grid, the light sources 10 are arranged in a straight line, so that the glare becomes strong. However, when the light emitting device 23 is arranged on the plane at almost equal intervals, the glare is suppressed and the human's vision is suppressed. Discomfort to the eyes can be reduced. Furthermore, compared with the case where the light sources 10 are arranged on a straight line, the distance between the adjacent light sources 10 is increased, so that thermal interference between the adjacent light sources 10 is suppressed, and the light emitting device on which the light sources 10 are mounted. Heat accumulation in the drive circuit board 22 is suppressed, and heat is efficiently dissipated outside the light emitting device 23. As a result, it is possible to obtain a long-life light-emitting device 23 having stable optical characteristics over a long period of time with less discomfort to human eyes.

  FIG. 4 is a diagram illustrating another example of the portion where the overhanging surface 19 is formed. In FIG. 4, the first and second translucent members 16 and 17 are virtually shown for easy understanding. The overhanging surface 19 is configured to face the upper main surface 13a. For example, as shown in FIG. 4A, the protruding surface 19 may be configured to simply face the upper main surface 13a. In this case, the inner peripheral surface portion on the upper side of the overhanging surface 19 is formed in a tapered shape. However, by making the corner portion of the second translucent member 17 abut, it is undesirably applied to the reflecting member 15. To prevent displacement.

  Further, for example, as shown in FIG. 4B, a groove portion 25 that forms the protruding surface portion 20 may be formed on the inner peripheral surface portion. By forming such a groove portion 25, the virtual plane including the inner peripheral surface 15 a can be made flat, so that foreign matter that obstructs light from the light emitting element 11 is eliminated undesirably and emitted from the light emitting element 11. The emitted light can be efficiently emitted outward.

  For example, as shown in FIG. 4C, a stepped portion 21 for placing the second translucent member 17 may be formed on the upper portion of the groove portion 25 that forms the protruding surface portion 20. As a result, it is possible to realize a configuration having the function and effect of combining FIG. 1 and FIG.

  Next, the light source 10a according to the second embodiment of the present invention will be described. FIG. 5 is a cross-sectional view showing the light source 10a of the present embodiment as viewed from the front. In the present embodiment, the reflecting member 15 includes a pair of reflecting structural bodies 30 and 31 that are a pair of base portions that can be connected and separated from each other. One reflection structure 30 is formed with at least the overhanging surface portion 20, and the other reflection structure 31 is formed with at least a contact portion 31 a that contacts the base 13. The reflecting member 15 of the first embodiment is configured so as to be divided in the axial direction along a virtual plane including the projecting surface 19, and the second light transmitting member 17 is disposed in one reflecting structure 30. The other reflecting component 31 is provided in contact with the base 13.

  In other words, the reflecting member 15 is manufactured separately from the upper and lower sides with the protruding portion 20 as a boundary, and the two are joined to form the same shape as the reflecting member 15 described above. One reflection component 30 is formed by integrating the protrusion 20 and the upper part of the reflection member 15, and the other reflection component 31 is formed by the lower part of the reflection member 15.

  Although not shown, one reflection structure may be formed by integrating the protrusion 20 and the lower part of the reflection member 15, and the other reflection structure may be formed by the upper part of the reflection member 15. Thus, by making the reflecting member 15 separately on the upper and lower sides with the projecting portion 20 as a boundary, the processing of the projecting portion 20 can be facilitated, and the reflecting member 15 is made into a shape suitable for mass production. Is possible.

  4B and 4C, when the overhanging surface portion 20 is constituted by the groove portion 25, the reflecting member 15 is divided into two in the groove portion 25 below the overhanging surface 19, and a pair of reflections are made. By using the structural bodies 30 and 31, processing can be facilitated.

  Further, even when the base 13 and the one reflection component 30 are configured integrally, by configuring the base 13 and the one reflection component 30 so as to be separable from each other, The same effect as this embodiment can be achieved.

  Next, the light source 10b according to the third embodiment of the present invention will be described. FIG. 6 is a cross-sectional view showing the light source 10b of the present embodiment as viewed from the front. In the present embodiment, the reflecting member 15 is not formed with the protruding portion 20, the inner peripheral surface 15 a is configured to be flat, and the protruding surface portion 20 is provided inward of the inner peripheral surface portion of the reflecting member 15. This is realized by the ring-shaped member 40.

  As shown in FIG. 6, the protrusion 20 provided on the inner surface of the reflecting member 15 is provided by fitting a ring-shaped member 40, which is separate from the reflecting member 15, into the inner surface of the reflecting member 15. Thus, if the ring-shaped member 40 which becomes the projection part 20 is produced separately from the reflecting member 15, the shape of the reflecting member 15 becomes simple, and the reflecting member 15 can be made into a shape suitable for mass production. It becomes. As a result, it is not necessary to carry out complicated processing for providing the projecting surface portion 20 on the inner peripheral surface 15a, and therefore the manufacturing cost can be reduced.

  Moreover, when arrange | positioning the ring-shaped member 40 on a slope, it is preferable to chamfer the corner | angular part of the ring-shaped member 40, and to make it the shape which is easy to follow a slope. By adopting such a shape, even a slope can be suitably arranged at a desired position, and undesired displacement from the arranged position can be prevented.

  FIG. 7 is an enlarged view showing a part of a light source 10b of another example of the present embodiment. A step 21 for arranging the ring-shaped member 40 is formed on the inner peripheral surface 15 a of the reflecting member 15. When the ring-shaped member 40 is directly attached to the inclined surface, the accuracy of the attachment of the ring-shaped member 40 is lowered unless the inclination angle of the reflecting surface 15a and the outer shape of the ring-shaped member 40 are high. By forming the step portion 21, the above problem can be solved. Further, by providing the step portion 21 so that the side surface of the second translucent member 17 also contacts the step portion 21, the second translucent member 17 is moved downward along the reflecting surface 15 a, and the step The unit 21 can be placed in a predetermined position, and can be easily and accurately installed.

  Next, a light emitting device 23a according to another embodiment of the present invention will be described. FIG. 8 is a plan view showing a light emitting device 23a of another form. FIG. 9 is a cross-sectional view showing the light emitting device 23a as seen from the front. The light emitting device drive circuit board 22 is formed in a circular shape when viewed from one side in the thickness direction. A plurality of circular and polygonal light sources 10 are arranged in a plurality of groups concentrically on the light emitting device driving circuit board 22. The number of the light sources 10 is set so that the outer peripheral side is larger than the radial center side. As a result, more light sources 10 can be arranged while maintaining an appropriate interval between the light sources 10, and the illuminance of the light emitting device 23a can be further improved. Further, it is possible to suppress the accumulation of heat in the central portion of the light emitting device drive circuit board 22 due to the heat generated by the light source 10. As a result, the temperature distribution in the light emitting device driving circuit board 22 can be made uniform, heat can be efficiently transferred to the external electric circuit board and the heat sink provided in the light emitting device 23a, and the temperature rise of the light emitting device 23a. Can be suppressed. Therefore, the light-emitting device 23a can operate stably over a long period of time and can realize a long-life light-emitting device 23a.

  In addition, this invention is not limited to the example of the above embodiment, If it is in the range which does not deviate from the summary of this invention, it will not interfere at all.

  For example, a plurality of light emitting elements 11 may be mounted on the base 13 in order to improve the radiation intensity. Further, it is possible to arbitrarily adjust the angle of the reflecting surface 15a, whereby a complementary color gamut can be provided, and a better color rendering property can be obtained.

  The light emitting device 23 is not limited to a configuration in which a plurality of light sources 10 are arranged in a predetermined manner, but may be a device in which one light source 10 is arranged in a predetermined arrangement. For example, one light source 10 may be arranged at the center of the lighting device.

  The reflecting surface 15a is, for example, a linear inclined surface whose longitudinal cross-sectional shape spreads outward as it goes upward, a curved inclined surface that spreads outward as it goes upward, or inclined in the middle It may be a shape such as a linear inclined surface whose angle changes.

  Moreover, when arrange | positioning the 2nd translucent member 17 on a slope, it is preferable to chamfer the corner | angular part of the 2nd translucent member 17 and make it the shape which is easy to follow a slope. By adopting such a shape, even a slope can be suitably arranged at a desired position, and undesired displacement from the arranged position can be prevented.

  Further, in each of the above-described embodiments, the light source 10 is configured including the second light transmissive member 17, but the light source 10 and the light emitting device 23 are configured by the remaining configuration excluding the second light transmissive member 17. May be realized. In this case, the phosphor 12 is contained in the first translucent member 16. Since the upper surface of the first translucent member 16 is configured to be flat by the projecting surface 19, the remaining operational effects other than the operational effects of the second translucent member 17 can be achieved.

  In each of the above-described embodiments, the reflection surface 15a is formed on the inner peripheral surface 15a of the reflection member 15. However, the light source 10 and the light emitting device 23 may be realized without forming the reflection surface 15a. As a result, the function and effect of the remaining configuration excluding the function and effect of the reflecting surface 15a can be achieved.

  Further, in each of the above-described embodiments, the phosphor 12 is contained only in the second light transmissive member 17. However, the present invention is not limited to such a configuration, and the phosphor 12 is disposed on the first light transmissive member 16. The light source 10 may be configured by inclusion.

  In addition, a light-emitting element storage package that includes the base body 13 and the reflecting member 15 constituting the light source 10 and that stores the light-emitting element is formed. By manufacturing a light source using the light-emitting element storage package, the first It can prevent as much as possible that the individual difference resulting from the shape of the translucent member 16 arises.

  Further, the protrusion 20 and the ring-shaped member 40 formed on the reflecting member 15 are preferably configured to have translucency. As a result, the light from the light emitting element 11 can be prevented from being undesirably blocked by the protrusions 20 and the ring-shaped member 40, and the light source 10 that efficiently uses the light from the light emitting element 11 can be realized.

It is sectional drawing which shows the light source 10 of the 1st Embodiment of this invention seeing from the front. 3 is a plan view showing a light emitting device 23 including a light source 10. FIG. It is sectional drawing which shows the light-emitting device 23 seeing from the front. It is a figure which shows the other example of the part in which the overhang | projection surface 19 is formed. It is sectional drawing which shows the light source 10a of this Embodiment seeing from the front. It is sectional drawing which shows the light source 10b of this Embodiment seeing from the front. It is a figure which expands and shows a part of light source 10b of the other example of this Embodiment. It is a top view which shows the light-emitting device 23a of another form. It is sectional drawing which shows the light-emitting device 23a seeing from the front. It is sectional drawing which shows the light source 1 of a prior art seeing from the front.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10a, 10b Light source 11 Light emitting element 12 Phosphor 13 Base 14 Placement part 15 Reflective member 16 1st translucent member 17 2nd translucent member 18 Conductive layer 19 Overhang | projection surface 20 Overhang | projection surface part 21 Step part 23, 23a Light emitting device

Claims (14)

A light emitting element storage package in which a light emitting element is stored,
A base on which a recess for accommodating the light emitting element is formed;
A light reflecting surface formed on the inner surface portion surrounding the bottom portion of the recess, and having light reflectivity;
A light emitting element storage package, comprising: a projecting surface portion provided on the inner surface portion and having a projecting surface facing the bottom surface portion of the recess. A light emitting element storage package in which a light emitting element is stored,
A base on which a recess for accommodating the light emitting element is formed;
A light emitting element storage package comprising: an overhanging surface portion provided on an inner surface portion surrounding the bottom surface portion of the recess and having an overhanging surface facing the bottom surface portion of the recess.   3. The light emitting element storage package according to claim 1, wherein the projecting surface of the projecting surface portion and the bottom surface of the bottom surface portion are disposed substantially parallel to each other.   The light emitting element storage package according to any one of claims 1 to 3, wherein a convex portion for forming the protruding surface portion is formed on the inner surface portion.   The light emitting element storage package according to any one of claims 1 to 3, wherein a groove portion for forming the protruding surface portion is formed in the inner surface portion. The base includes a pair of bases that can be connected and separated from each other;
The light emitting element storage package according to claim 1, wherein at least the projecting surface portion is formed on one base portion. A ring-shaped member provided inside the inner surface portion;
The light emitting element storage package according to claim 4, wherein the convex portion is the ring-shaped member. The light emitting element storage package according to any one of claims 1 to 7,
A light emitting element;
A mounting portion provided on a bottom surface portion of the concave portion, on which the light emitting element is mounted;
1st translucent member which has translucency and is provided covering the outer periphery of the said light emitting element mounted in the said mounting part, Comprising: It is provided in contact with the overhang | projection surface of the said overhang | projection surface part. A light source comprising: a first translucent member.   The light source according to claim 8, further comprising a second translucent member that has translucency, is provided to face the first translucent member, and contains a phosphor. The light emitting element storage package according to claim 3,
A light emitting element;
A mounting portion provided on a bottom surface portion of the concave portion, on which the light emitting element is mounted;
1st translucent member which has translucency and is provided covering the outer periphery of the said light emitting element mounted in the said mounting part, Comprising: It is provided in contact with the overhang | projection surface of the said overhang | projection surface part. A first translucent member;
A second translucent member that has translucency and is formed in a sheet shape containing phosphor, and is provided in contact with the convex portion at a position facing the first translucent member. A light source characterized by including.   The light source according to claim 8, wherein the placement unit is provided at a position separated from a bottom surface of the recess.   The light source according to any one of claims 9 to 11, wherein the second translucent member extends outward from an inner edge portion of the projecting surface.   The light source according to claim 12, wherein the second light transmissive member is provided with a gap between the second light transmissive member and the first light transmissive member. A light source according to any one of claims 8 to 13,
A drive unit mounted with the light source and having electrical wiring for driving the light source;
And a light reflecting means for reflecting light emitted from the light source.

Images