JP2009206466A - Package for storing light emitting element, and light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a package for storing a light emitting element capable of reducing the color variability of light emitted from the light emitting elements when storing the plurality of light emitting elements different in light emission wavelength, and also to provide a light emitting device. <P>SOLUTION: The package for storing the light emitting element has a base 1 having a plurality of holes 2 for storing the plurality of light emitting elements 5 different in light emission wavelength. An inner peripheral surface 4 of at least one hole 2 is different from the inner peripheral surface 4 of the other hole 2 concerning reflectance with respect to the light emitted from the same light emitting element 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light emitting element housing package and a light emitting device for housing a light emitting element such as a light emitting diode (LED) or a semiconductor laser (LD).

  Conventionally, a light-emitting element storage package (hereinafter also referred to as a package) has been used to store a light-emitting element such as a light-emitting diode (LED) or a semiconductor laser (LD). Such a light-emitting element storage package includes a base body having a hole portion for storing the light-emitting element on the upper surface, and a pair of wiring conductors led out from the bottom surface of the hole portion to the lower surface of the base body.

  Then, the light emitting element is mounted on the bottom surface of the hole portion, and the electrode of the light emitting element and the pair of wiring conductors are electrically connected via bonding wires or the like, and then the light emitting element is attached with a transparent sealing resin or the like. By sealing, a light emitting device is formed.

  Note that light emitted from the light emitting element is reflected by the inner peripheral surface of the hole. In such a light emitting element storage package, a reflective layer whose surface is made of a gold plating layer, a silver plating layer, or the like is provided on the inner peripheral surface of the hole portion as necessary.

Patent Document 1 describes a light-emitting element storage package in which a plurality of holes are formed in a base and light-emitting elements are stored in the respective holes.
JP 2005-150408 A

  In Patent Document 1, it is assumed that the inner peripheral surfaces of a plurality of holes formed in a base have the same material conditions. In such a case, the reflectance with respect to the light emitted from the same light emitting element on the inner peripheral surface of the hole is the same. However, the reflectance with respect to the light on the inner peripheral surface of the hole varies with the wavelength of light emitted by the light emitting element. Therefore, when the light emitting elements are housed in the plurality of holes, and the wavelengths of light emitted by the light emitting elements housed in the respective holes are different, the inner periphery of the hole for the light emitted by each light emitting element. Due to the difference in the reflectance of the surfaces, there is a concern that when the light emitted from the plurality of light emitting elements is fused, uneven color tone of the light occurs, and the light emitting device emits light with uneven color tone. Note that the uneven color tone of light is a partial variation in the color tone of light emitted from the light emitting device.

  The present invention has been completed in view of the above-described conventional problems, and an object of the present invention is to provide a light emitting device capable of reducing uneven color tone of emitted light when housing a plurality of light emitting devices having different emission wavelengths. The object is to provide a storage package and a light emitting device.

  The light emitting element storage package of the present invention includes a base body having a plurality of holes for storing a plurality of light emitting elements having different emission wavelengths, and an inner peripheral surface of at least one of the holes is the other hole. The reflectance with respect to the light emitted from the same light emitting element as the inner peripheral surface of the part is different.

  Preferably, the inner peripheral surface of the hole is made of a material different for each hole depending on the light emission wavelength of the light emitting element.

  Preferably, the inner peripheral surface of the hole has a different surface roughness for each hole depending on the light emission wavelength of the light emitting element.

  Preferably, the inner peripheral surface of the hole portion has an open porosity different for each hole portion according to a light emission wavelength of the light emitting element.

  Preferably, the inner peripheral surface of at least two of the hole portions includes a surface of a reflective layer provided on an inner wall of the hole portion, and the reflective layer corresponds to the hole portion according to the emission wavelength of the light emitting element. Each thickness is different.

  Preferably, the inner peripheral surface of each hole has a plurality of regions made of different materials, the combination of the materials is the same in each hole, and the inner peripheral surface of the hole is Depending on the emission wavelength of the light emitting element, the area ratio of each region differs for each hole.

  The light-emitting device of the present invention includes the light-emitting element storage package of the present invention and a plurality of light-emitting elements having different emission wavelengths stored in the plurality of holes of the light-emitting element storage package.

  The light emitting element storage package of the present invention includes a base body having a plurality of holes for storing a plurality of light emitting elements having different emission wavelengths, and an inner peripheral surface of at least one hole is formed of another hole. The reflectance with respect to the light emitted from the same light emitting element as the inner peripheral surface is different. Thereby, the reflectance with respect to the light which the light emitting element accommodated in the inner peripheral surface of a hole part light-emits can be adjusted by combining a light emitting element and a hole part. Therefore, the light emitting element storage package of the present invention can emit light with little color tone unevenness.

(First embodiment)
The first embodiment of the light emitting element storage package of the present invention will be described in detail below. FIG. 1A is a plan view showing an example of an embodiment of a light emitting element storage package according to the present invention, and FIG. 1B is a bottom view of the light emitting element storage package shown in FIG. is there. 2A is a cross-sectional view taken along line AA ′ in FIG. 1A, and FIG. 2B is a cross-sectional view taken along line BB ′ in FIG. In these drawings, 1 is a substrate, 2 is a hole, 3 is a wiring conductor, 4 is an inner peripheral surface, 5 is a light emitting element, and 6 is a bonding wire.

  The light emitting element storage package of the present embodiment includes a base body 1 having a plurality of holes 2 for storing a plurality of light emitting elements 5 having different emission wavelengths, and an inner peripheral surface 4 of at least one hole 2. Are different in reflectance to light emitted from the same light emitting element 5 as the inner peripheral surface 4 of the other hole 2.

  1 and 2, the base 1 has three holes 2 (a hole 2a having an inner peripheral surface 4a, a hole 2b having an inner peripheral surface 4b, and a hole 2c having an inner peripheral surface 4c). It has. In addition, the light emitting elements 5a, 5b, and 5c are accommodated in the holes 2a, 2b, and 2c, respectively.

The base 1 is made of an insulating material such as ceramics or resin. When the substrate 1 is made of ceramics, the substrate 1 is made of ceramics such as an aluminum oxide sintered body (alumina ceramics), an aluminum nitride sintered body, a mullite sintered body, or a glass ceramic sintered body. It is plate-shaped. When the substrate 1 is made of an aluminum oxide sintered body, the substrate 1 is produced as follows. First, a suitable organic solvent or solvent is added to and mixed with raw material powders such as alumina (Al ₂ O ₃ ), silica (SiO ₂ ), calcia (CaO), or magnesia (MgO) to prepare a slurry. Next, this slurry is formed into a sheet by a conventionally known doctor blade method or calender roll method, and a ceramic green sheet (ceramic green sheet) is produced. Next, an appropriate punching process is performed on these ceramic green sheets. Note that a plurality of these ceramic green sheets are laminated as necessary. And the base | substrate 1 is produced by baking by high temperature (about 1500-1800 degreeC) finally.

  A plurality of holes 2 for accommodating the light emitting elements 5 are provided on the upper surface of the substrate 1. The hole 2 is formed in, for example, a circular shape such as a circular shape, an elliptical shape, or an oval shape in a plan view, or a polygonal shape such as a quadrangular shape.

  Such a hole 2 is formed as follows, for example. First, several ceramic green sheets (hereinafter also referred to as first ceramic green sheets) among the ceramic green sheets used when the substrate 1 is manufactured are provided with a plurality of hole portions by a hole processing method using a punching die or the like. 2 through-holes are formed. Then, the first ceramic green sheet and a ceramic green sheet that does not form a through hole for the hole 2 (hereinafter also referred to as a second ceramic green sheet) are laminated, and these ceramic green sheets are fired simultaneously. The

  A wiring conductor 3 is formed on the base 1 from the bottom surface 1 a of the hole 2 to the bottom surface of the base 1. The wiring conductor 3 is a conductive path that electrically connects the light emitting element 5 housed in the hole 2 of the base 1 to the outside. A light emitting element 5 such as a light emitting diode (LED) or a semiconductor laser (LD) is mounted on the bottom 1a of the hole 2, and the electrode of the light emitting element 5 and the wiring conductor 3 are electrically connected as follows, for example. Connected to. The light emitting element 5 is mounted on the wiring conductor 3, and one wiring conductor 3 and one electrode of the light emitting element 5 are fixed and electrically connected by a conductive bonding material such as gold-silicon alloy or silver-epoxy resin. In addition, the other wiring conductor 3 and the other electrode of the light emitting element 5 are electrically connected through the bonding wire 6. The wiring conductor 3 formed on the lower surface of the base 1 is connected to the wiring of the external electric circuit board, whereby each electrode of the light emitting element 5 is electrically connected to the wiring of the external electric circuit board. Electric power and drive signals are supplied to Each electrode of the light emitting element 5 may be electrically connected to the wiring conductor 3 only by flip chip mounting or only by wire bonding. In the above description, the wiring conductor 3 is led out to the lower surface of the base body 1. However, if necessary, it may be led out to the side surface of the base body 1 or the upper surface of the base body 1 and joined to the wiring of the external electric circuit board. Absent.

  And the wiring conductor 3 consists of metallization obtained by baking the metal powder suitably selected from tungsten, molybdenum, manganese, silver, or copper. For example, when the substrate 1 is made of an aluminum oxide sintered body, the wiring conductor 3 is formed as follows. First, a conductor paste containing a metal powder such as tungsten, molybdenum, or manganese is prepared. Then, a conductor paste for the wiring conductor 3 is applied to a predetermined position of the ceramic green sheet for the substrate 1 by a thick film method such as a screen printing method. Thereafter, by firing these ceramic green sheets and conductor paste at the same time, the wiring conductor 3 can be formed in a predetermined region of the substrate 1.

  In addition, the metal which is excellent in corrosion resistance, such as nickel, gold | metal | money, or silver, is adhered to the exposed surface of the wiring conductor 3 as needed. Thus, corrosion of the wiring conductor 3 can be effectively suppressed, the wiring conductor 3 and the light emitting element 5 are fixed, the wiring conductor 3 and the bonding wire 6 are joined, and the wiring conductor 3 and the external electric power are connected. Bonding between the circuit board and the wiring conductor can be strengthened. Further, for example, on the exposed surface of the wiring conductor 3, a nickel plating layer with a thickness of about 1 to 10 μm and a gold plating layer or a silver plating layer with a thickness of about 0.1 to 5 μm are electroplating or electroless. Sequentially deposited by plating.

  And in 1st embodiment of the light emitting element storage package of this invention, the inner peripheral surface 4 of each hole 2 light-emits the same light emitting element 5 as the inner peripheral surface 4 of the other hole 2. FIG. The reflectance for light is different. By changing the reflectance of the inner peripheral surface 4 of the hole 2 for each hole 2 according to the emission wavelength of the light emitting element 5 accommodated in the hole 2, the hole for the light emitted by the corresponding light emitting element 5 is changed. 2 can be reduced. Here, making the reflectance of the inner peripheral surface 4 of the hole 2 different for each hole 2 means changing the reflectance for the light emitted by the same light emitting element 5 for each hole 2. . For example, the reflectance for light emitted from the same light emitting element 5 is changed to 90%, 85%, and 80% for each hole 2. Here, the light emitting element 5 having a short emission wavelength is accommodated in the hole portion 2 having a high reflectance, and the light emitting element 5 having a long light emission wavelength is accommodated in the hole portion 2 having a low reflectance, whereby the inner peripheral surface of the hole portion 2. 4 has a tendency to increase as the light emission wavelength becomes longer and to decrease as the light emission wavelength becomes shorter. Therefore, the light emitting element 5 that emits light having a long light emission wavelength is accommodated. The reflectance of the inner peripheral surface 4 of the hole 2 with respect to light with a long emission wavelength and the light with a short emission wavelength of the inner peripheral surface 4 of the hole 2 in which the light emitting element 5 that emits light with a short emission wavelength is housed. The reflectance can be brought close to. Thereby, the light emitting element storage package can reduce the variation in luminance of the light emitted from each hole 2 and emit light with less color tone unevenness.

  In the present specification, the inner peripheral surface 4 of the hole 2 indicates the surface that forms the boundary between the light emitting element storage package and the space on the side surface of the hole 2, and the inner wall 7 of the hole 2. Indicates the surface of the substrate 1 on the side surface of the hole 2. The inner peripheral surface 4 of the hole 2 is constituted by the inner wall 7 of the hole 2 or the surface of the reflective layer 8 provided on the inner wall 7 of the hole 2.

  Moreover, the reflectance of the inner peripheral surface 4 refers to a reflectance when light is reflected by the entire inner peripheral surface 4 of the hole 2. The reflectance of the inner peripheral surface 4 is determined by irradiating a part of the inner peripheral surface 4 with light having a specific wavelength, measuring total reflected light with a spectrophotometer, and comparing the intensity of the reflected light and the intensity of the incident light. It can be obtained by determining the ratio. Here, in the case where the material, thickness, surface roughness, porosity, pore diameter, etc. in the inner peripheral surface 4 are composed only of a uniform region, the reflectance of the inner peripheral surface 4 is determined at a plurality of locations on the inner peripheral surface 4. It is obtained by taking the average value of the measured reflectance. Further, when the inner peripheral surface 4 is composed of a plurality of regions having different materials, thicknesses, surface roughnesses, porosity, pore diameters, etc., the reflectance of the inner peripheral surface 4 is determined by measuring the reflectance of each region, The average value of the reflectance of the area is taken. For example, when the inner peripheral surface 4 is composed of regions a and b having different reflectivities, the reflectivity Rt of the inner peripheral surface 4 is determined by measuring the reflectivity and area of each region, and Rt = Ra × Sa / St + Rb × Sb. It is obtained by calculating / St. Here, Ra refers to the reflectance of the region a, and Rb refers to the reflectance of the region b. Further, Sa refers to the area of the region a, Sb refers to the area of the region b, and St refers to the entire area of the inner peripheral surface 4. When the hole 2 is filled with resin, the reflectance is measured after the resin is peeled off. The variation in reflectance means a standard deviation in reflectance with respect to light.

  Here, the reflectance with respect to the light emitted by the same light emitting element 5 on the inner peripheral surface 4 of each hole 2 can be specifically changed as follows. In the first embodiment of the light emitting element storage package of the present invention, the inner peripheral surface 4 of the hole 2 is the inner wall 7 of the hole 2 or the surface of the reflective layer 8 provided on the inner wall 7 of the hole 2. The inner peripheral surface 4 of the hole 2 is made of different materials. 1 and 2, the inner wall 7b of the hole 2b is used as the inner peripheral surface 4b of the hole 2b. The surface of the reflective layer 8a provided on the inner wall 7a of the hole 2a is used as the inner peripheral surface 4a of the hole 2a, and the surface of the reflective layer 8c provided on the inner wall 7c of the hole 2c is the hole 2c. Used as the inner peripheral surface 4c. In the above description, for example, the surface of the reflective layer 8a is made of a silver plating layer, the inner wall 7b is made of ceramics, and the surface of the reflective layer 8c is made of a gold plating layer. That is, the inner peripheral surface 4 of the hole 2 is made of different materials. Here, the reflectance with respect to the light emitted from the same light emitting element 5 differs depending on the material, whereby the reflectance of the inner peripheral surface 4 with respect to the light emitted from the same light emitting element 5 can be changed for each hole 2.

  For example, when the plurality of light emitting elements 5 are a blue LED, a green LED, and a red LED, the inner peripheral surface 4a accommodates the red LED in the hole 2a made of gold, and the inner peripheral surface 4b has a hole made of ceramic. When the green LED is housed in 2b and the blue LED is housed in the hole portion 2c whose inner peripheral surface 4c is made of silver, the inner peripheral surface 4 of all the hole portions 2 is made of silver, ceramic, or gold compared to Variations in the reflectance of the three holes 2a, 2b, 2c can be reduced. Accordingly, the light-emitting element storage package can emit light with less color unevenness. In addition, the reflectance with respect to the light which the light emitting element 5 of the inner peripheral surface 4a of the hole 2a which consists of the surface of a silver plating layer emits is the same as that of the inner peripheral surface 4c of the hole 2c which consists of the surface of a gold plating layer. There is a tendency that the reflectance of the light emitted from the light emitting element 5 is higher than the reflectance. Further, when ceramic is used as the substrate 1, the reflectance of the inner peripheral surface 4a of the hole 2a made of the surface of the silver plating layer with respect to light is as follows: the inner peripheral surface 4b of the hole 2b made of the inner wall 7 of the hole 2. It tends to be higher than the reflectance for light. In addition, since the reflectance with respect to the light which the same light emitting element 5 light-emits differs with materials, according to the reflectance of the internal peripheral surface 4 for every hole 2, the hole part 2 in which each light emitting element 5 is accommodated is selected. do it.

  The reflective layer 8 includes a metallized layer obtained by firing a metal powder appropriately selected from tungsten, molybdenum, manganese, silver, or copper, and nickel, gold, and the like deposited on the exposed surface of the metallized layer. Or it forms from plating layers, such as silver. The plating layer may be a plating layer composed of a plurality of layers such as a nickel plating layer / silver plating layer and a nickel plating layer / gold plating layer / silver plating layer, if necessary. In this case, the reflectance of the surface of the reflective layer 8 with respect to the light emitted from the same light emitting element 5 can be varied by using different types of plated layers as the surface of the reflective layer 8 in each hole 2. The reflective layer 8 is formed as follows. First, after applying a conductor paste for metallization layer to the inner surface of the through hole for the hole 2 formed in the first ceramic green sheet by a thick film method such as a screen printing method, the first ceramic green sheet and the second ceramic green sheet The metallized layer is formed by simultaneously firing the ceramic green sheet and the conductive paste for the metallized layer. Then, similarly to the wiring conductor 3 described above, the reflective layer 8 is formed by depositing a plating layer on the metallized layer using an electrolytic plating method or an electroless plating method. In addition, when depositing a plating layer using the electrolytic plating method, each reflective layer 8 is electrically connected to the wiring conductor for plating conduction, and after the substrate 1 is immersed in the plating solution, the plating lead is formed. A plating layer is deposited on the metallized layer by passing a current through the common wiring conductor.

  And when attaching the reflective layer 8 from which material differs to the internal peripheral surface 4 of each hole part 2, respectively, while being electrically connected to the reflective layer 8 of one hole part 2, for example, the other hole The wiring conductor for plating conduction that is electrically cut off from the reflection layer 8 of the portion 2 may be provided for each reflection layer 8 of each hole portion 2. And after immersing the base | substrate 1 in a plating solution, by sending an electric current through the wiring for plating conduction | electrical_connection electrically connected to the reflective layer 8 of one hole part 2, it is applied to the reflective layer 8 of one hole part 2 Current flows, and no current flows in the reflective layer 8 in the other hole 2, so that a plating layer can be deposited on the metallized layer only in the reflective layer 8 in one hole 2. The plating layer can be deposited on the metallized layer for each hole 2 by repeating the same method as described above for the reflective layer 8 in the other hole 2. Further, when a plating layer is deposited on the metallized layer of the reflective layer 8 in one hole 2 by electrolytic plating or electroless plating, the opening in the other hole 2 is covered with a resin film or the like in advance. It doesn't matter. Thereby, when the base body 1 is immersed in the plating solution, the plating solution is not immersed in the other hole 2, so that the plating layer is deposited on the metallized layer only in the reflective layer 8 of the one hole 2. be able to. A plating layer can be deposited on the metallized layer for each reflective layer 8 in each hole 2 by repeating the same method as described above for the other hole 2.

  In the above description, the reflectance of light emitted from the same light emitting element 5 is different on the inner peripheral surface 4 of each hole 2, but three or more holes 2 are formed in the base 1. In this case, in the inner peripheral surface 4 of at least one of the plurality of hole portions 2, the reflectance with respect to the light emitted by the same light emitting element 5 is different from the inner peripheral surface 4 of the other hole portions 2. It only has to be. That is, the reflectance with respect to the light emitted from the same light emitting element 5 may be different from the inner peripheral surface 4 of the hole 2 where the variation in reflectance is desired to be reduced.

  Further, by providing the inner peripheral surface 4 of at least one hole 2 as the surface of the reflective layer 8 provided on the inner wall 7 of the hole 2, the reflection with respect to the light having the emission wavelength of the inner peripheral surface 4 of the hole 2 is performed. The rate can be easily varied. For example, the inner peripheral surface 4 of one hole 2 is the inner wall 7 of the hole 2, and the inner peripheral surface 4 of the other hole 2 is the surface of the reflective layer 8. The reflectance with respect to the light emitted by the same light emitting element 5 on the surface 4 can be easily changed. Moreover, by making the material of the reflective layer 8 different in the reflective layer 8 provided on the inner wall 7 of the one hole 2 and the reflective layer 8 provided on the inner wall 7 of the other hole 2, The reflectance with respect to the light emitted from the same light emitting element 5 on the inner peripheral surface 4 of these hole portions 2 can be easily varied. That is, since the reflectance with respect to the light emitted from the same light emitting element 5 can be made different depending on the material, the reflectance of the inner peripheral surface 4 with respect to the light emitted from the same light emitting element 5 can be easily changed for each hole 2. Can be made.

  Next, a method for manufacturing the light emitting element storage package shown in FIGS. 1 and 2 will be described. First, a first ceramic green sheet and a second ceramic green sheet for the substrate 1 are prepared. Next, a plurality of through holes to be the plurality of hole portions 2 are formed in the first ceramic green sheet by a hole processing method such as a punching die. Next, a conductive paste to be a metallized layer of the reflective layer 8 is applied to the inner peripheral surface of the through hole by a thick film method such as a screen printing method. Next, the first ceramic green sheet and the second ceramic green sheet are laminated and fired. Then, a plating layer is deposited on the metallized layer formed by firing using an electroless plating method or an electrolytic plating method. As described above, the light-emitting element storage package shown in FIGS. 1 and 2 can be manufactured.

  In addition, in the manufacturing method of the above-mentioned light emitting element accommodation package, when forming the wiring conductor 3, it goes through the following processes, for example. Separately from the through hole that becomes the hole 2, the wiring conductor through hole is punched into the second ceramic green sheet using a punching die. Then, the wiring conductor through-hole is filled with the wiring conductor metal paste by a thick film method such as screen printing, and the wiring conductor metal paste is applied to the main surface of the second ceramic green sheet. And the wiring conductor 3 is formed by baking the metal paste for wiring conductors simultaneously with a 1st ceramic green sheet and a 2nd ceramic green sheet. When the plating conduction wiring conductor is formed on the substrate 1, the plating conduction wiring conductor is formed in the same manner as the wiring conductor 3.

  Next, a light-emitting device including the light-emitting element storage package of this embodiment will be described. The light-emitting device includes the light-emitting element storage package of the present embodiment and a plurality of light-emitting elements 5 having different light emission wavelengths stored in the plurality of holes 2 of the light-emitting element storage package. Therefore, the configuration of the light emitting element storage package of this embodiment provides a light emitting device in which uneven color tone of emitted light is reduced.

  The light emitting element 5 is housed in the hole 2 of the light emitting element housing package of the present embodiment, and is electrically connected to the wiring conductor 3. The light emitting element 5 is a light emitting diode or a semiconductor laser. The plurality of light emitting elements 5 housed in the hole 2 are light emitting elements 5 having different emission wavelengths, such as a blue LED, a green LED, and a red LED.

  And when the some light emitting element 5 is blue LED, green LED, and red LED, Preferably, the internal peripheral surface 4a of the hole 2a in which blue LED is accommodated consists of silver, and the hole in which green LED is accommodated The inner peripheral surface 4b of 2b is made of ceramics, and the inner peripheral surface 4c of the hole 2c in which the red LED is accommodated is made of gold. In this case, as compared with the case where the inner peripheral surfaces 4 of all the hole portions 2 are made of the same material, the variation in reflectance in each hole portion 2 can be reduced. Accordingly, the light emitting device can emit light with less color tone unevenness.

  Although not shown, the light emitting element 5 may be sealed with a translucent member. In this case, the translucent member is a sealing resin made of, for example, a silicone resin or an epoxy resin. And after apply | coating sealing resin so that the light emitting element 5 of the base | substrate 1 may be covered, it becomes a light-emitting device by hardening | sealing sealing resin.

(Second embodiment)
Next, a second embodiment of the light emitting element storage package of the present invention will be described. In the present embodiment, the substrate 1 has at least two hole portions 2 in which the reflective layer 8 is provided on the inner wall 7, and the thickness of each reflective layer 8 is different. 3 and FIG. 4, for example, when both the reflective layer 8a and the reflective layer 8c are made of a silver plated layer, the thickness of the silver plated layer of the reflective layer 8a is set to 5 μm, and the reflective layer 8c The thickness of the silver plating layer may be 1 μm. Other configurations are the same as the configuration of the light emitting element storage package of the first embodiment. Here, since the silver plating layer is deposited with a large thickness, it is easy to reduce the influence of the underlayer such as the metallized layer or to increase the gloss of the reflective layer 8. There is a tendency that the reflectance with respect to the emitted light becomes higher. Therefore, the reflectance with respect to the light emitted by the same light emitting element 5 can be made different between the inner peripheral surface 4a of the hole 2a and the inner peripheral surface 4c of the hole 2c. In the above-described case, the reflectance with respect to the light emitted from the same light emitting element 5 on the inner peripheral surface 4a of the hole 2a with the thick silver plating layer is the inner periphery of the hole 2c with the thin silver plating layer. It tends to be higher than the reflectance with respect to the light emitted from the same light emitting element 5 on the surface 4c. For example, when the plurality of light emitting elements 5 are a blue LED, a green LED, and a red LED, the housed light emitting elements 5 are reflected on the inner wall 7 of each hole 2 in the order of the blue LED, the green LED, and the red LED. The thickness of the layer 8 is thin. In this case, as compared with the case where the inner peripheral surfaces 4 of all the hole portions 2 have the same thickness, the variation in reflectance of the hole portions 2a, 2b, and 2c with respect to the light emitted from the corresponding light emitting element 5 is reduced. be able to. As a result, the light-emitting element storage package can emit light with little color tone unevenness.

  In the light emitting device including the light emitting element storage package according to the second embodiment of the present invention, the light emitting element 5 is stored in the hole 2 of the light emitting element storage package according to the second embodiment of the present invention. And electrically connected to the wiring conductor 3. In addition, the several light emitting element 5 accommodated in the hole 2 is the light emitting element 5 from which light emission wavelength differs similarly to the case of 1st Embodiment.

  In addition, when attaching the reflective layer 8 from which thickness differs in the inner peripheral surface 4 of each hole part 2, while being electrically connected to the reflective layer 8 of one hole part 2, for example, the other hole part 2 is attached. The plating conductive wiring conductor that is electrically cut off from the reflective layer 8 may be provided for each reflective layer 8 in each hole 2. And after immersing the base | substrate 1 in a plating solution, by sending an electric current through the wiring for plating conduction | electrical_connection electrically connected to the reflective layer 8 of one hole part 2, it is applied to the reflective layer 8 of one hole part 2 Current flows, and no current flows in the reflective layer 8 in the other hole 2, so that a plating layer can be deposited on the metallized layer only in the reflective layer 8 in one hole 2. The thickness of the plating layer deposited on the metallized layer of the reflective layer 8 is made different for each hole 2 by repeating the same method as described above for the reflective layer 8 of the other hole 2. Can do. Also, the resistance value connected to the reflective layer 8 is made different by changing the length, width, or material of the plating conduction wiring conductor electrically connected to the reflective layer 8 for each hole 2. May be. Therefore, when the substrate 1 is immersed in the plating solution and a current is passed through the plating conduction wiring conductor, the reflection layer 8 is different due to the difference in resistance value of the plating conduction wiring conductor connected to the reflection layer 8 of each hole 2. The thickness of the plating layer deposited on the metallized layer can be made different for each hole 2. Further, when a plating layer is deposited on the metallized layer of the reflective layer 8 in one hole 2 by electrolytic plating or electroless plating, the opening in the other hole 2 is covered with a resin film or the like in advance. It doesn't matter. Thereby, when the base body 1 is immersed in the plating solution, the plating solution is not immersed in the other hole 2, so that the plating layer is deposited on the metallized layer only in the reflective layer 8 of the one hole 2. be able to. Then, by repeating the same method as described above for the other hole 2, the thickness of the plating layer deposited on the metallized layer of the reflective layer 8 can be made different for each hole 2.

(Third embodiment)
Next, a third embodiment of the light emitting element storage package of the present invention will be described. In the present embodiment, the base 1 has at least two holes 2, and the surface roughness of the inner peripheral surface 4 is different for each hole 2. 5 and FIG. 6, for example, the inner peripheral surface 4a and the inner peripheral surface 4c are respectively composed of the surfaces of the reflective layer 8a and the reflective layer 8c, and the reflective layer 8a and the reflective layer 8c are silver-plated. In the case of layers, the surface roughness of the reflective layer 8a is different from that of the reflective layer 8c. Other configurations are the same as the configuration of the light emitting element storage package of the first embodiment. Here, when the surface roughness of the reflective layer 8a is rougher than the surface roughness of the reflective layer 8c, the inner peripheral surface 4a of the hole 2a tends to diffuse light more easily than the inner peripheral surface 4c of the hole 2c. There is. For this reason, the reflectance with respect to the light emitted from the same light emitting element 5 on the inner peripheral surface 4a of the hole 2a is lower than the reflectance with respect to the light emitted from the same light emitting element 5 on the inner peripheral surface 4c of the hole 2c. .

  Thus, when the surface roughness of the inner peripheral surface 4 of the hole 2 is different, the reflectance of the inner peripheral surface 4 of the hole 2 is also different. Therefore, by changing the surface roughness of the inner peripheral surface 4 of the hole 2 for each hole 2 in accordance with the emission wavelength of the light emitting element 5 accommodated in the hole 2, the light emitted from the corresponding light emitting element 5 is emitted. The variation in the reflectance of the hole 2 with respect to can be reduced. For example, when the plurality of light emitting elements 5 are a blue LED, a green LED, and a red LED, the surface roughness of the reflective layer 8 provided on the inner wall 7 of each hole 2 is set in the order of the blue LED, the green LED, and the red LED. By making it rough, the dispersion | variation in the reflectance in each hole part 2 can be made small compared with the case where the internal peripheral surface 4 of all the hole parts 2 consists of the same surface roughness. As a result, the light-emitting element storage package can emit light with little color tone unevenness.

  In the present specification, the surface roughness means centerline average roughness (also referred to as Ra). Moreover, in the inner peripheral surfaces 4 having different surface roughnesses, the Ra of the inner peripheral surface 4 having a small surface roughness is preferably 50% or less with respect to the Ra of the inner peripheral surface 4 having a large surface roughness. .

  Moreover, in order to make the surface roughness of the reflection layer 8 different for every hole part 2, it can form by making the surface roughness of the metallization layer used as the base layer of a plating layer differ. Specifically, when the metallized layer is formed on the inner peripheral surface 4 of each hole 2, the average particle size of the metal powder of the conductor paste that becomes the metallized layer of the reflective layer 8 may be varied. In addition, when the average particle diameter of the metal powder is reduced, the surface roughness of the inner peripheral surface 4 of the hole 2 is reduced compared with the case where the average particle diameter of the metal powder is increased. The reflectance with respect to the light emitted from the light emitting element 5 tends to increase.

  The light emitting device having the light emitting element storage package of the third embodiment of the present invention is the same as the light emitting device having the light emitting element storage package of the first and second embodiments described above. Forms can be used.

(Fourth embodiment)
Next, a fourth embodiment of the light emitting element storage package of the present invention will be described. In the present embodiment, the base 1 has at least two holes 2, and the open porosity of the inner peripheral surface 4 is different for each hole 2. 7 and FIG. 8, for example, when the inner peripheral surface 4a and the inner peripheral surface 4c are respectively made of a reflector 10a made of ceramics and a surface of a reflector 10c made of ceramics, the reflector 10a And the reflector 10c have different open porosity. Other configurations are the same as the configuration of the light emitting element storage package of the first embodiment. Here, when the open porosity of the inner peripheral surface 4a of the hole 2a is lower than the open porosity of the inner peripheral surface 4c of the hole 2c, the same light-emitting element 5 on the inner peripheral surface 4a of the hole 2a. The reflectance with respect to the emitted light is lower than the reflectance with respect to the emitted light of the same light emitting element 5 on the inner peripheral surface 4c of the hole 2c. In this specification, the open porosity is based on JIS R1600-4112, and the measurement method of the open porosity is based on JIS R1634. The reflector 10 is made of, for example, frame-shaped ceramics and is formed in the hole 2.

  Such an inner peripheral surface 4 having different open porosity can be formed by preparing a plurality of reflectors 10 having different open porosity and fitting these reflectors 10 for each hole 2. Thereby, the reflectance with respect to the light which the same light emitting element 5 of the internal peripheral surface 4 light-emits for every hole part 2 differs. A plurality of ceramic frame bodies in which through holes for the hole portions 2 having different open porosity of the inner peripheral surface 4 are prepared, and these ceramic frame bodies are flattened so as to surround the mounting portion of the light emitting element 5. The substrate 1 having a plurality of hole portions 2 may be formed by bonding them on a substrate with a bonding material such as resin or glass. Thereby, the base | substrate 1 from which the open porosity of the internal peripheral surface 4 differs for every hole part 2 is formed.

  In the light emitting device including the light emitting element storage package according to the fourth embodiment of the present invention, the same form as that of the light emitting device including the above light emitting element storage package can be used.

(Fifth embodiment)
Next, a fifth embodiment of the light emitting element storage package of the present invention will be described. In the present embodiment, the inner peripheral surface 4 of the hole 2 has a plurality of regions made of different materials, the combination of materials is the same in each hole 2, and the inner peripheral surface 4 of the hole 2 is Depending on the light emission wavelength of the light emitting element 5, the area ratio of each region differs for each hole 2. 9 and FIG. 10, for example, each inner peripheral surface 4 of each hole 2 includes a surface of an inner wall 7 made of ceramics and a surface of a reflective layer 8 made of a silver plating layer. Thus, when the areas of the inner peripheral surfaces 4 of the holes 2 are the same, the areas of the reflective layers 8 are different. Other configurations are the same as the configuration of the light emitting element storage package of the first embodiment. Here, since the silver plating layer tends to have a higher reflectance than ceramics, the same light emitting element on the inner peripheral surface 4 of the hole portion 2 becomes smaller as the areas of the reflective layer 8a, the reflective layer 8b, and the reflective layer 8c become smaller. The reflectance with respect to the emitted light of 5 becomes low. That is, since the reflectance of the surface of the inner wall 7 and the surface of the reflective layer 8 is different, each area ratio of the inner wall 7 and the reflective layer 8 on the inner peripheral surface 4 of each hole 2 is different. The reflectance with respect to the light which the same light emitting element 5 of the inner peripheral surface 4 of the hole 2 emits can be made different.

  Thus, in order to make the area ratio of the inner wall 7 and the reflective layer 8 different in the inner peripheral surface 4 of each hole 2, a metallized layer of the reflective layer 8 is formed on the inner wall 7 of each hole 2. In doing so, the area ratio between the inner wall 7 and the metallized layer may be different for each hole 2. As a result, when the plating layer is deposited on the metallized layer, the plating layer is deposited only in the region where the metallized layer is formed, so the inner wall 7 and the reflective layer on the inner peripheral surface 4 of each hole 2 The area ratio with 8 can be varied.

  In addition, the area of the inner peripheral surface 4, the inner wall 7, and the reflection layer 8 can be calculated | required by calculating mathematically from the shape of the hole 2, for example. Moreover, you may obtain | require the area of the internal peripheral surface 4, the inner wall 7, and the reflection layer 8 using the apparatus etc. which measure the surface shape with a laser.

  In the light emitting device including the light emitting element storage package according to the fifth embodiment of the present invention, the same form as that of the light emitting device including the above light emitting element storage package can be used.

  As the substrate 1, a white substrate 1 is preferably used. Compared with the case where the dark base 1 is used, when the light emitting device is viewed in plan, the entire light emitting device can be seen bright.

  Further, in the light emitting element storage package according to the first to fifth embodiments, the width of the hole 2 is the same from the opening side of the hole 2 toward the bottom surface 1a side of the hole 2, but the hole The width of 2 may be wider from the opening side of the hole 2 toward the bottom surface 1a side of the hole 2 or may be narrower.

  Further, in each hole 2, the shape of the hole 2 such as the depth may be different for each hole 2. For example, when the thicknesses of the reflective layers 8 are different, the depth of the hole 2 provided with the thick reflective layer 8 is made deeper than the depth of the hole 2 provided with the thin reflective layer 8. As a result, the variation in the luminance of the light emitted from each hole 2 can be further reduced. Therefore, the light-emitting element storage package can emit light with less color tone unevenness.

  1 and 2, the base body 1 has a hole 2 having an inner wall 7 as an inner peripheral surface 4. However, as shown in FIGS. 11 and 12, the base 1 has an inner wall 7 of all the plurality of holes 2. A reflective layer 8 may be provided.

  In addition, the thickness of the reflective layer 8 on the opening side of each hole 2 may be larger than the thickness of the reflective layer 8 on the bottom 1a side. For example, when a silver plating layer is used for the reflection layer 8, the silver plating layer may be modified by moisture in the atmosphere that has entered the hole 2 from the interface between the base 1 and the sealing resin, and the reflectance may be reduced. Can be reduced.

  Moreover, although it has been described above that the reflective layer 8 is composed of a metallized layer and a plated layer, the reflective layer 8 may be composed of only the metallized layer or only the plated layer. When the reflective layer 8 is composed only of a plating layer, the reflective layer 8 may be provided on the inner wall 7 of the hole 2 by a thin film method such as vapor deposition or sputtering, or may be provided by other methods.

  Further, as shown in FIGS. 13 and 14, a frame body 9 surrounding the plurality of hole portions 2 may be laminated on the upper surface of the base 1. The frame 9 is made of, for example, an insulating material such as ceramics or resin, or a metal material. When the frame body 9 is made of an insulating material, it is preferable that the frame body be white based on the same reason as in the case of the substrate 1.

  When the frame body 9 is made of ceramics, the frame body 9 can be manufactured by using the same method as that for the base body 1. When the frame 9 is made of a metal material, the frame 9 has a metal material such as nickel, gold, silver, platinum, or palladium, or a plating layer such as nickel, gold, silver, platinum, or palladium on the surface. A deposited metal material such as copper, copper-tungsten, iron-nickel, or iron-nickel-cobalt is preferably used and manufactured. The base body 1 and the frame body 9 are bonded by a bonding material. For example, when the substrate 1 is made of a ceramic material and the frame body 9 is made of a metal material, a bonding metal layer for bonding to the frame body 9 is formed on the upper surface of the substrate 1, and this bonding metal layer And the frame 9 may be joined using a brazing material such as a silver-copper brazing material. When both the base 1 and the frame 9 are made of ceramics, the base 1 and the frame 9 may be integrated by laminating the respective ceramic green sheets and then sintering them.

  In addition, you may provide the reflective layer for frames on the inner wall of the frame 9 which consists of such ceramics. Such a frame reflection layer can be formed by the same method as that for the reflection layer 8 described above. When the frame body 9 made of ceramics is provided, the wiring conductor 3 may be led out to the upper surface of the frame body 9 or the side surface of the frame body 9. In this case, the wiring conductor 3 formed on the frame body 9 can be formed using the same method as that for forming the wiring conductor 3 on the substrate 1.

  In addition, when the wiring body 3 is provided on the upper surface of the frame body 9 and the wiring conductor 3 is electrically connected via the bonding wire 6, the frame body 9 is sealed so as to cover the bonding wire 6. A stop resin may be applied or filled.

  In addition, when the frame body 9 is formed on the upper surface of the base body 1, the sealing resin filled in the hole 2 may be different from the sealing resin filled in the frame body 9. For example, the hole 2 may contain a fluorescent material in the sealing resin. Moreover, you may make the sealing resin with which it fills in the some hole part 2 contain a respectively different fluorescent material. In addition, when the sealing resin is filled in the plurality of holes 2, the fluorescent materials contained in the filled sealing resin may be different from each other.

  As shown in FIG. 15, the plurality of hole portions 2 may be arranged in one direction. Such a light emitting element storage package can be used when it is desired to narrow the width in a direction perpendicular to one direction of the light emitting device. For example, in a side view type light emitting element housing package, the height of the light emitting element housing package can be reduced.

  In addition, as shown in FIG. 16, a plurality of light emitting elements 5 may be accommodated in one hole 2. When a plurality of light emitting elements 5 are accommodated in the hole 2, the light emitting elements 5 that do not require a difference in reflectance in one hole 2, that is, the light emission wavelengths are close or the light emission wavelengths are the same. The light emitting elements 5 are accommodated. In this case, the reflectance with respect to the light emitted from the light emitting elements 5 accommodated on the inner peripheral surface 4 of one hole 2 is close. For example, in the case of FIG. 16, the light emitting element 5a and the light emitting element 5d, the light emitting element 5b and the light emitting element 5e, the light emitting element 5c and the light emitting element 5f may be different from each other in the reflectance. 5 are used, and are accommodated in the plurality of holes 2, respectively. In FIG. 16, two light emitting elements 5 are accommodated in one hole 2, but the number of light emitting elements 5 accommodated in each hole 2 may be different. For example, two light emitting elements 5 may be accommodated in the hole 2a, and one light emitting element 5 may be accommodated in each of the holes 2b and 2c. Although an example in which three holes 2 provided in the base 1 are provided has been described above, the number of the holes 2 may be two, or four or more. The hole 2 may be provided in accordance with the emission wavelength and number of the light emitting elements 5 mounted on the substrate 1 and the size of the light emitting elements 5.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.
For example, as shown in FIG. 17, the light emitting element 5 is directly mounted on the bottom 1a of the hole 2 without forming the mounting portion of the light emitting element 5 as a conductor layer, and the electrode of the light emitting element 5 is electrically connected to the periphery thereof. The wiring conductor 3 connected to may be formed. In this case, the light emitting element 5 is mounted on the bottom 1a of the hole 2, and the electrode of the light emitting element 5 and the wiring conductor 3 are electrically connected through the bonding wire 6 and the like. Further, as shown in FIG. 18, a metal body 1 d may be used for a part of the substrate 1. In this case, the metal body 1d and the other member 1e of the base body 1 made of ceramics or the like are joined to form the base body 1. For example, by using a metal having high thermal conductivity such as copper for the metal body 1d, heat generated by the light emitting element 5 can be transmitted to the metal body 1d, and the heat dissipation of the light emitting device can be improved. In such a case, as shown in FIG. 18, a plurality of metal bodies 1 d may be fitted to the respective hole portions 2, or one metal body 1 d may be fitted into the plurality of hole portions 2. You can combine them.

(A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). (A) is sectional drawing in the A-A 'line of (a) of Fig.1 (a), (b) is sectional drawing in the B-B' line of Fig.1 (a). (A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). (A) is sectional drawing in the C-C 'line of (a) of Fig.5 (a), (b) is sectional drawing in the D-D' line of Fig.5 (a). (A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). FIG. 5A is a cross-sectional view taken along line E-E ′ in FIG. 5A, and FIG. 5B is a cross-sectional view taken along line F-F ′ in FIG. (A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). (A) is sectional drawing in the G-G 'line | wire of (a) of Fig.7 (a), (b) is sectional drawing in the H-H' line | wire of Fig.7 (a). (A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). (A) is sectional drawing in the I-I 'line of (a) of Fig.9 (a), (b) is sectional drawing in the J-J' line of Fig.7 (a). (A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). 11A is a cross-sectional view taken along line K-K ′ in FIG. 11A, and FIG. 13B is a cross-sectional view taken along line L-L ′ in FIG. (A) is a top view which shows an example of embodiment about the light emitting element accommodation package of this invention, (b) is a bottom view of (a). FIG. 13A is a cross-sectional view taken along line M-M ′ in FIG. 13A, and FIG. 15B is a cross-sectional view taken along line N-N ′ in FIG. It is a top view which shows an example of embodiment about the light emitting element storage package of this invention. It is a top view which shows an example of embodiment about the light emitting element storage package of this invention. (A) is a top view which shows an example of embodiment about the package for light emitting element accommodation of this invention, (b) is sectional drawing in the O-O 'line | wire of (a). (A) is a top view which shows an example of embodiment about the package for light emitting element accommodation of this invention, (b) is sectional drawing in the P-P 'line | wire of (a).

Explanation of symbols

1: Base 1a: Bottoms 2, 2a, 2b, 2c: Holes 3: Wiring conductors 4, 4a, 4b, 4c: Inner peripheral surfaces 5, 5a, 5b, 5c: Light emitting element 7: Inner walls 8, 8a, 8b, 8c: Reflective layer 9: Frame 10: Reflector

Claims (7)

Comprising a substrate having a plurality of holes for accommodating a plurality of light emitting elements having different emission wavelengths;
The light emitting element storage package in which the inner peripheral surface of at least one of the holes has a different reflectance with respect to light emitted from the same light emitting element as the inner peripheral surface of the other hole.   2. The light emitting element storage package according to claim 1, wherein an inner peripheral surface of the hole is made of a material different for each hole according to a light emission wavelength of the light emitting element.   2. The light emitting element storage package according to claim 1, wherein the inner peripheral surface of the hole portion has a surface roughness different for each hole portion according to a light emission wavelength of the light emitting element.   2. The light emitting element storage package according to claim 1, wherein the inner peripheral surface of the hole has a different open porosity for each of the holes according to a light emission wavelength of the light emitting element. The inner peripheral surface of at least two of the holes is composed of a surface of a reflective layer provided on the inner wall of the hole,
The light emitting element storage package according to claim 1, wherein the reflective layer has a different thickness for each hole according to an emission wavelength of the light emitting element. The inner peripheral surface of each hole has a plurality of regions made of different materials, and the combination of the materials is the same in each hole,
2. The light emitting element storage package according to claim 1, wherein the inner peripheral surface of the hole portion has an area ratio of each region different for each hole portion according to a light emission wavelength of the light emitting element. The light emitting element storage package according to any one of claims 1 to 6,
A light emitting device comprising: a plurality of light emitting elements having different emission wavelengths housed in the plurality of holes of the light emitting element housing package.

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