JP2006269487A - Light-emitting device and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device that can take out light emitted from a light-emitting element to the outside of the light-emitting device so that luminous intensity on a luminous surface becomes uniform, has high radiation light intensity and high luminance, and does not have any points where the luminous intensity is strong extremely. <P>SOLUTION: The light-emitting device includes a substrate 2 having a placement section 2a where the light-emitting element 4 is placed on the upper surface; a frame body 3 that is attached onto the upper surface of the substrate 2, so that the placement section 2a is surrounded with an inner-periphery surface 3a as a light reflection surface; the light-emitting element 4 placed at the placement section 2a; and a light-transmitting member 5 placed so that the upper section of the light-emitting element 4 is covered. In the light-emitting device, a hole 6 having an inclined surface is provided partially at a part positioned directly above the light-emitting element 4 on the upper surface of the light-transmitting member 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light emitting device in which a light emitting element is accommodated and an illumination device using the same.

  Light-emitting devices using light-emitting elements such as light-emitting diodes (LEDs) and semiconductor lasers (LDs) have been attracting attention because they are expected to further reduce power consumption and extend their life in the future. It has begun to be used in various fields such as indicators, optical sensors, displays, photocouplers, backlights, and optical printer heads. A conventional phosphor that converts light such as near-ultraviolet light and blue light emitted from a light emitting element such as a light emitting diode (LED) into light having a visible region wavelength such as red, green, blue, yellow, etc. A light-emitting device that emits light is shown in FIG. In FIG. 13, 12 is a base body, 13 is a frame body, 13a is an inner peripheral surface of the frame body 13, and 14 is a light emitting element.

  The conventional light emitting device 11 has a placement portion 12a for placing the light emitting element 14 on the upper surface, and a wiring conductor 12b that electrically connects the inside and outside of the light emitting device 11 from the placement portion 12a and its periphery. The base body 12 made of an insulator and the outer peripheral portion of the upper main surface of the base body 12 are bonded and fixed, the upper opening is formed with a through hole larger than the lower opening, and the inner peripheral surface 13a is the light emitting element 14. It is mainly comprised from the frame 13 used as the light reflection surface which reflects the light radiated | emitted from, and the light emitting element 14 mounted and fixed to the mounting part 12a.

This light-emitting device can emit visible light by causing the light-emitting element 13 to emit light by a drive current supplied from an external electric circuit. In recent years, this light-emitting device has been used for illumination, and a light-emitting device having higher characteristics in terms of high luminance, heat dissipation, and visibility is required.
JP 2003-298116 A

  By the way, when the light emission intensity distribution of the light emitting element 14 is compared on the same plane above the light emitting element 14, the light emission intensity generally decreases around the peak with the peak directly above the light emitting element 14.

  For this reason, in the structure of the conventional light emitting device, the upper surface of the translucent member 15 serving as the light emitting surface of the light emitting device has a light emission intensity peak at a position located immediately above the light emitting element 14 and from a position directly above the light emitting element 14. As the distance increases, the emission intensity becomes weak, and the emission intensity is not uniform.

  Accordingly, the present invention has been completed in view of the above-mentioned conventional problems, and an object of the present invention is to provide a light-emitting device that has high radiated light intensity and high luminance and has no extremely strong light emission intensity. It is.

  The light emitting device of the present invention includes a base having a mounting portion on which a light emitting element is mounted on the upper surface, and an inner peripheral surface attached to the upper surface of the base so as to surround the mounting portion. In the light emitting device, the light transmitting device includes: the frame body configured as described above; the light emitting element placed on the placement portion; and a light transmissive member disposed to cover the light emitting element. A hole portion having an inclined surface is partially provided in a portion of the upper surface of the member located immediately above the light emitting element.

  In the light emitting device of the present invention, the hole portion has an inverted conical shape.

  The light-emitting device of the present invention is characterized in that a phosphor layer that converts the wavelength of light from the light-emitting element is formed above the hole.

  The light emitting device of the present invention is characterized in that a phosphor layer that converts the wavelength of light from the light emitting element is formed on the light reflecting surface.

  The illuminating device of the present invention is characterized by using the light emitting device of the present invention as a light source.

  The light-emitting device of the present invention has a uniform intensity of light emitted from the light-emitting element by partially providing a hole portion having an inclined surface in a portion of the upper surface of the translucent member located immediately above the light-emitting element. It can radiate with a simple distribution. That is, since the conventional light emitting device is formed of a translucent member having a flat upper surface, most of the light emitted in the normal direction of the upper surface of the light emitting element having a particularly strong light emission intensity is directly emitted to the outside of the light emitting device. However, according to the configuration of the light-emitting device of the present invention, the inclined surface of the hole is formed on the upper surface of the translucent member positioned immediately above the light-emitting element, so that the light-emitting element protrudes in the normal direction of the upper surface of the light-emitting element. When the light is emitted to the outside of the light emitting device, a part of the light passes through the hole as it is and travels to the outside of the light emitting device, but the remaining light is reflected by the inclined surface of the hole and again enters the light emitting device. You can go back. Then, the light that is reflected back into the light emitting device without being emitted to the outside of the light emitting device is then reflected on the light reflecting surface formed on the inner peripheral surface of the frame, thereby forming the light transmitting member. The light is emitted from the periphery of the hole on the upper surface to the outside of the light emitting device. Thereby, the intensity of light emitted from the central portion of the upper surface of the translucent member can be reduced, the light reflected by the hole and the light reflecting surface and emitted from the periphery of the hole, and the light emitting element The intensity of the light emitted from the outer peripheral portion of the upper surface of the translucent member can be increased by combining the light emitted from and directly emitted from the periphery of the hole. As a result, when the light emitting surface is viewed from the outside of the light emitting device, the light emitting intensity can be made uniform, and a light emitting device in which a point with extremely strong light emitting intensity is not easily formed in the field of view can be obtained. it can.

  The light emitting device of the present invention is a light emitting device in which the hole portion has an inverted conical shape so that the intensity of light emitted from the light emitting element is made more uniform, and intensity unevenness on the light emitting surface of the light emitting device is suppressed. Can do. This is because the hole is formed in an inverted conical shape so that a surface parallel to the upper surface of the light emitting element is not formed in the hole, and most of the light emitted in the normal direction of the upper surface of the light emitting element is an inverted cone. Since it is incident on the side surface of the formed hole, the desired light is transmitted to the outside of the light emitting device, the remaining light is reflected by the light reflecting surface, and the intensity of the light emitted from the upper surface of the translucent member is increased. It can be further reduced and adjusted.

  In the light emitting device of the present invention, when the phosphor layer that converts the wavelength of light from the light emitting element is formed above the hole, the light emitted from the light emitting element is emitted from the inclined surface of the hole. Since the air layer above has a lower refractive index, the refraction of light on the upper surface of the hole is increased, and the light can be spread over a wide range on the upper side, so that the phosphor layer is evenly irradiated with light evenly. be able to. Furthermore, since the lower surface of the phosphor layer is in contact with the air layer having a lower refractive index, when light emitted in a wide range from the upper surface of the translucent member is incident on the lower surface of the phosphor layer, refraction is applied to the upper surface of the light emitting element. Can proceed in the normal direction. Therefore, it is possible to obtain a light emitting device that can effectively prevent color unevenness due to a difference in wavelength conversion efficiency by approximating the path length that passes through the phosphor layer in the entire phosphor layer.

  In the light emitting device of the present invention, the phosphor layer that converts the wavelength of light from the light emitting element is formed on the light reflecting surface, so that the light reflected by the hole and returned to the inside of the light emitting device and the light reflected directly from the light emitting element. Since any of the light that travels to the surface and is emitted to the outside of the light emitting device can be efficiently wavelength-converted by the phosphor layer formed on the light reflecting surface, a light emitting device having a light emitting surface with less color unevenness can be obtained. Therefore, a light-emitting device that can efficiently convert the wavelength of light emitted from the light-emitting element into a desired color and does not have an extremely strong point can be obtained.

  Since the illumination device of the present invention uses the light-emitting device of the present invention as a light source, it has a light-emitting surface with a uniform light intensity distribution that has high radiated light intensity and brightness, and does not have an extremely strong point of light emission intensity. It can be set as a lighting device.

  The light emitting device of the present invention will be described in detail below. FIG. 1 is a cross-sectional view illustrating an example of an embodiment of a light emitting device of the present invention, and FIG. 2 is an exploded view of the light emitting device of FIG. 1 and FIG. 2, 2 is a base, 2 b is a wiring conductor, 3 is a frame body, 4 is a light emitting element, 5 is a translucent member, and 6 is a hole, and a light emitting device in which the light emitting element 4 is accommodated 1 is mainly composed.

  The light-emitting device 1 of the present invention includes a base 2 having a mounting portion 2a on which the light-emitting element 4 is mounted on the upper surface, and an inner peripheral surface attached to the upper surface of the base 2 so as to surround the mounting portion 2a. 3a includes a frame 3 having a light reflecting surface, a light emitting element 4 mounted on the mounting portion 2a, and a translucent member 5 disposed so as to cover the upper side of the light emitting element 4. A hole 6 having an inclined surface is provided in a portion of the upper surface of the translucent member 5 located immediately above the light emitting element 4.

  The substrate 2 of the present invention is made of ceramics such as an aluminum oxide sintered body (alumina ceramics), an aluminum nitride sintered body, glass ceramics, and the like, and a support member for supporting and placing the light emitting element 4 and a light emitting element. It functions as a heat radiating member for radiating the heat of the element 4.

  The base 2 is provided with a mounting portion 2a for the light emitting element 4. The light emitting element 4 is provided with a resin adhesive, tin (Sn) -lead (Pb) solder, gold (Au) on the mounting portion 2a. -It is attached via a low melting point brazing material such as Sn.

  Further, a wiring conductor 2 b led out from the vicinity of the mounting portion 2 a of the base body 2 to the outside of the light emitting device 1 is formed.

  The wiring conductor 2b is formed of, for example, a metallized layer such as tungsten (W), molybdenum (Mo), manganese (Mn), or copper (Cu). An organic solvent or a solvent is added to and mixed with powder such as W. The obtained metal paste is formed on the substrate 2 by printing and applying it in a predetermined pattern.

  Further, on the surface of the wiring conductor 2b, for the purpose of preventing oxidation or for the purpose of firmly connecting solder or the like when electrically connected to the light emitting element 4, a Ni layer having a thickness of 0.5 to 9 μm or A metal layer such as an Au layer having a thickness of 0.5 to 5 μm is preferably deposited by a plating method.

  The frame 3 is made of metal such as aluminum (Al), stainless steel (SUS), silver (Ag), iron (Fe) -nickel (Ni) -cobalt (Co) alloy, Fe-Ni alloy, resin, ceramics, or the like. . In addition, when the frame 3 is made of metal, the inner peripheral surface 3a is made a mirror surface by a method such as polishing, so that the inner peripheral surface 3a can be a reflective surface that can favorably reflect light emitted from the light emitting element 4. The manufacturing method can be obtained by forming a predetermined shape by subjecting the ingot of the material as described above to metal processing such as cutting, rolling and punching. In addition, since the inner peripheral surface 3a that reflects light emitted from the light emitting element 4 with high efficiency can be more easily manufactured, and further, it can be prevented from corroding due to oxidation or the like, the frame 3 is made of Al or SUS. Preferably it consists of:

  Further, when the frame 3 is made of resin or ceramics, the inner peripheral surface 3a is formed with a metal layer by plating, vapor deposition, or the like, so that the inner peripheral surface 3a can reflect light emitted from the light emitting element 4 well. It can be.

  The frame 3 is formed on the base 2 with a resin adhesive such as silicone or epoxy, a metal brazing material such as Ag-Cu brazing, Pb-Au-Sn, Au-Sn-silicon (Si), Sn-Ag. -Joined with solder such as Cu. Such a bonding material such as adhesive and solder may be appropriately selected in consideration of the material of the base 2 and the frame 3, the thermal expansion coefficient, and the like, and is not particularly limited. Further, when high reliability of bonding between the base body 2 and the frame body 3 is required, it is preferable to bond them with a metal brazing material or solder.

  The light emitting element 4 may have any peak wavelength of energy to be emitted from the ultraviolet region to the infrared region. However, from the viewpoint of emitting white light and light of various colors with good visibility, a near ultraviolet system of 300 to 500 nm is used. To an element that emits blue light. For example, a buffer layer composed of gallium (Ga) -nitrogen (N), Al-Ga-N, indium (In) -GaN, etc., an N-type layer, a light-emitting layer, and a P-type layer are sequentially stacked on a sapphire substrate. A gallium nitride compound semiconductor or a silicon carbide compound semiconductor is used.

  The translucent member 5 is made of a transparent resin such as a silicone resin, an epoxy resin, or a urea resin that has a high transmittance with respect to light in the ultraviolet light region to the visible light region, a transparent glass such as a low-melting glass, a sol-gel glass, or the like. It fills so that the light emitting element 4 may be coat | covered inside the frame 3. FIG. By filling the translucent member 5, the difference in refractive index between the inner side and the outer side of the light emitting element 4 is reduced, and light can be efficiently extracted from the light emitting element 4 to the translucent member 5. It can be made to function as a protective member.

  In addition, a hole 6 having an inclined surface is provided in a portion of the upper surface of the translucent member 5 located immediately above the light emitting element 4. Here, when attention is paid to the path through which light emitted in the normal direction of the upper surface of the light emitting element having particularly high emission intensity is emitted to the outside of the light emitting device, the upper surface of the conventional light emitting device is flat as shown in FIG. Since the light emitting surface is directly emitted from the translucent member 15 to the outside of the light emitting device 11, when the light emitting surface is viewed from the outside of the light emitting device, the light emission intensity reaches a peak at a portion located directly above the light emitting element 14 and immediately above the light emitting element 14. As the distance from the position increases, the emission intensity decreases and the emission intensity does not become uniform. However, in the configuration of the light emitting device 1 according to the present invention, since the hole 6 having the inclined surface is provided in the portion located immediately above the light emitting element 4 on the upper surface of the translucent member 5, the light emitting element 4 to the upper surface of the light emitting element 4 are provided. When the light emitted in the normal direction is emitted to the outside of the light emitting device 1, a part of the light passes through the hole 6 as it is and proceeds to the outside of the light emitting device 1. It is possible to return to the inside of the light emitting device 1 by being reflected by the inclined surface. Then, the light reflected and returned to the inside of the light emitting device 1 without being emitted to the outside of the light emitting device 1 is then further reflected by the light reflecting surface formed on the inner peripheral surface 3a of the frame 3, The light is emitted from the upper surface of the translucent member 5 positioned around the hole 6 to the outside of the light emitting device 1. Thereby, while being able to reduce the intensity | strength of the light discharge | released from the center part of the upper surface of the translucent member 5, it reflects with the hole 6 and the light reflection surface, and the light discharge | released from the circumference | surroundings of the hole 6 The intensity of the light emitted from the outer peripheral portion of the upper surface of the translucent member 5 can be increased by the light emitted from the light emitting element 4 and directly emitted from the periphery of the hole 6. . As a result, when the light-emitting surface is viewed from the outside of the light-emitting device 1, the light-emitting intensity can be made uniform, and the light-emitting device 1 that is difficult to form a point where the light-emission intensity is extremely strong in the field of view. it can.

  Further, when the angle formed by the tangent line of the inclined surface of the hole 6 and the normal line of the upper surface of the light emitting element 4 is θ, the sine value is preferably 0.5 ≦ sin θ ≦ 0.8. If the sine value is larger than 0.8, the inclined surface of the hole 6 approaches the upper surface of the light emitting element 4 in parallel, and the light emitted in the normal direction from the upper surface of the light emitting element 4 is sufficiently introduced into the light emitting device. Since most of the light cannot be reflected and is emitted directly from the hole 6 to the outside of the light emitting device, it is difficult to suppress unevenness of the light intensity. When the angle θ formed by the tangent to the inclined surface of the hole 6 and the normal line of the upper surface of the light emitting element 4 is smaller than 90 degrees and the sine value is less than 0.5, most of the light emitted from the light emitting element 4 is obtained. Since the light is totally reflected on the inclined surface, unevenness in light emission intensity is likely to occur on the light emitting surface.

  In the case of the shape of the hole 6 as shown in FIG. 8, the angle θ formed by the tangent to the inclined surface of the hole 6 and the normal to the upper surface of the light emitting element 4 may be larger than 90 degrees. Even in this case, the sine value should be 0.5 or more. When the sine value is less than 0.5, total reflection is more likely to occur when the light reflected from the hole 6 and returned to the light emitting device exits from the inner peripheral surface 3a to the outside of the light emitting device. This is because much light is confined and the emission intensity tends to be small.

  The maximum inner diameter of the hole 6 is preferably 10% or more and 70% or less of the maximum outer diameter of the translucent member 5. If it is larger than 70%, the aperture diameter of the hole 6 becomes too large, and light with strong intensity emitted from the hole 6 positioned immediately above the light emitting element 4 to the outside of the light emitting device is reduced. The unevenness of strength is likely to occur. On the other hand, if it is smaller than 10%, the light of strong intensity emitted in the normal direction of the upper surface of the light emitting element 4 does not sufficiently enter the hole 6 and the light emitting element 4 positioned directly around the hole 6 The light enters the upper surface of the translucent member 5 that is nearly parallel to the upper surface and is emitted to the outside of the light emitting device. Therefore, the intensity of the light emitted in the normal direction of the upper surface of the light emitting element 4 cannot be reduced, and it is difficult to effectively suppress the intensity unevenness on the light emitting surface.

  Further, the depth of the hole 6 is preferably 10% or more and 90% or less of the distance between the hole 6 and the light emitting element 4.

  Further, the translucent member 5 filled inside the frame 3 so as to cover the light emitting element 4 emits light emitted from the light emitting element 4 to the outside of the light emitting device through a path having a small refractive index difference. As described above, it is preferable to sequentially reduce the refractive index in the order of the light emitting element 4 and the translucent member 5.

  Further, the inner peripheral surface of the hole 6 may be concave or convex as shown in FIG. 3, and the inside thereof is a translucent member such as silicone resin or fluorine resin as shown in FIG. It may be filled with a member 8 having a refractive index lower than 5. By filling the hole 6 with the member 8, the member 8 effectively suppresses the distortion even if the light transmissive member 5 tries to distort due to the heat generated during the operation of the light emitting element 4. In addition, by using the member 8 having a small refractive index, when light is emitted from the translucent member 5 to the hole 6, the light refraction at the inner surface of the hole 6 is increased, and the light is spread over a wide range on the upper side. Further, it is possible to suppress the emission intensity of the upper surface of the translucent member 5 positioned immediately above the light emitting element 4 from becoming stronger than the surroundings, and to effectively prevent unevenness in the emission intensity.

  In addition, when the light emitted from the light emitting element 4 and the light whose wavelength is converted by the phosphor layer are mixed, the size of the phosphor layer may be adjusted in order to mix the light at a desired ratio. . In particular, when a phosphor layer having a size smaller than the diameter of the hole 6 is provided above the light emitting device, the hole 6 is filled with the member 8 as described above, thereby providing a uniform emission intensity. And a light emitting device capable of mixing light at a desired ratio. Such a member 8 is made of a transparent resin such as a silicone resin, an epoxy resin, or a urea resin having a high transmittance with respect to light in the ultraviolet light region to the visible light region, a transparent glass such as a low melting glass, a sol-gel glass, or the like. It is good to be.

  Moreover, the manufacturing method of the hole part 6 is obtained by, for example, filling a mold formed in the shape of the hole part 6 with a thermosetting liquid transparent member and then heat-curing the mold. Moreover, as another method of manufacturing the hole 6, the translucent member is filled inside the frame, and the mold of the hole 6 is pressed to the position where the hole 6 is formed in the semi-cured state. There is a method of forming the hole 6 having a desired shape by peeling the mold after the light-transmitting member 5 is cured.

  Further, the phosphor layer 7 b may be provided above the hole 6. By providing the phosphor layer 7b above the hole portion 6, when the light emitted from the light emitting element 4 is emitted from the inclined surface of the hole portion 6, the upper portion of the hole portion 6 is an air layer having a lower refractive index. The refraction of the light on the upper surface of the hole 6 can be increased to spread the light over a wide range on the upper side, and the phosphor layer 7b can be evenly irradiated with light evenly. Furthermore, since the lower surface of the phosphor layer 7b is in contact with the air layer having a lower refractive index, light emitted from a wide range from the upper surface of the translucent member 5 is emitted by refraction when entering the lower surface of the phosphor layer 7b. It can progress in the normal direction of the upper surface of the element 4. Therefore, it is possible to make the light emitting device 1 that can effectively prevent color unevenness due to the difference in wavelength conversion efficiency by approximating the path length that transmits the phosphor layer 7b in the entire phosphor layer 7b.

  Here, the phosphor layer 7b is made of a transparent resin such as a silicone resin, an epoxy resin, or a urea resin having a high transmittance with respect to light in the ultraviolet light region to the visible light region, a transparent glass such as a low-melting glass, a sol-gel glass, or the like. At least one element selected from, for example, alkaline earth aluminate phosphors and rare earth elements, which is excited by the light of the light emitting element 4 and emits blue, red, green, etc. by recombination of electrons. Phosphors such as yttrium, aluminum, and garnet phosphors activated in the above, and phosphors such as pigments. And the light which has a desired light emission spectrum and a color is output by mix | blending fluorescent substance and a pigment in arbitrary ratios.

  Furthermore, the phosphor layer 7 a may be provided on the inner peripheral surface 3 a that is the light reflecting surface of the frame 3. By providing the phosphor layer 7 a on the inner peripheral surface 3 a, the light reflected by the hole 6 and returned to the inside of the light emitting device 1 and the light emitted from the light emitting element 4 directly to the inner peripheral surface 3 a and emitted to the outside of the light emitting device 1. Since any of the emitted light can be efficiently wavelength-converted by the phosphor layer 7a formed on the inner peripheral surface 3a, the light emitting device 1 having a light emitting surface with little color unevenness can be obtained.

  In particular, as shown in FIG. 5 which is an exploded view of FIGS. 4 and 4, it is preferable that phosphor layers 7a and 7b are provided both above the hole 6 and on the inner peripheral surface 3a. This is because the wavelength of the light transmitted through the hole 6 is converted by the phosphor layer 7 b provided above the hole 6, and the light reflected from the hole 6 and returned to the inside of the light emitting device 1 and the light emitting element 4 are used. Since any of the light that travels directly to the inner peripheral surface 3a and is emitted to the outside of the light emitting device 1 can be efficiently wavelength-converted by the phosphor layer 7a formed on the inner peripheral surface 3a, the light emitting surface has a uniform intensity. This is because the light emitting device 1 can be obtained. This is because the ratio of light that can be wavelength-converted by the phosphor layer with respect to the incident light is generally limited, and if light with too high intensity is incident on the phosphor layer 7b, The amount of light that can be wavelength-converted is saturated and the wavelength conversion efficiency deteriorates. However, since the hole 6 having the inclined surface is provided in the portion located on the upper surface of the translucent member 5 just above the light emitting element 4 as in the present invention, one of the strong light emitted in the normal direction is provided. Since the amount of light incident on the phosphor layer 7b can be adjusted by reflecting the portion to the inside of the light emitting device 1 with the inclined surface of the hole 6, the phosphor layer 7b can efficiently convert the wavelength of light. As described above, the light reflected from the hole 6 and the light directly traveling from the light emitting element 4 to the inner peripheral surface 3a can be wavelength-converted by the phosphor layer 7a, so that the light emitted from the light emitting element 4 can be converted into a desired color. Therefore, the light emitting device 1 can be efficiently wavelength-converted and has no extremely strong light emission intensity.

  Further, as shown in FIG. 7A, the entire upper surface of the translucent member 5 may be recessed, and a hole 6 having an inclined surface may be provided at a portion located directly above the light emitting element 4. This is because the strong light emitted in the normal direction of the upper surface of the light emitting element 4 is refracted on the inner peripheral surface of the hole 6 because the upper part of the translucent member 5 is an air layer having a lower refractive index. Can be expanded to spread light over a wide range on the upper side, and the light that has traveled around the hole 6 can also be spread over a wide range by the depression provided on the entire top surface of the translucent member 5. Therefore, it is possible to further effectively suppress the light emission intensity of the light emitting device from becoming extremely strong at one point, and to obtain a light emitting device capable of emitting light over a wider range.

  Further, when the phosphor layer 7 c is provided above the translucent member 5 as shown in FIG. 7B, the light emitted from the light emitting element 4 is emitted from the inclined surface of the hole 6 and the upper surface of the translucent member 5. Since the light is spread over a wide range when emitted from the recess provided in the fluorescent material, the phosphor layer 7c is evenly irradiated. Further, since the lower surface of the phosphor layer 7c is in contact with the air layer having a lower refractive index, the light emitted in a wide range from the depression provided on the inclined surface of the hole 6 and the upper surface of the translucent member 5 is: When entering the lower surface of the phosphor layer 7c, it can be advanced in the normal direction of the upper surface of the light emitting element 4 by refraction. Therefore, the light emitting device 1 can uniformly prevent the occurrence of color unevenness due to the difference in wavelength conversion efficiency by making the entire phosphor layer 7c have light incident uniformly and approximating the path length of the transmitted light in the entire phosphor layer 7c. can do.

  The inner peripheral surface 3 a of the frame 3 that can reflect the light emitted from the light emitting element 4 and emit the light to the outside is preferably inclined at an angle of 35 to 70 degrees with respect to the upper surface of the base 2. This is because if the angle is less than 35 degrees, the incident angle from the light emitting element 4 to the phosphor layer 6 exceeds 45 degrees, and the amount of light totally reflected at the interface between the translucent member 5 and the phosphor layer 6 is large. Because it becomes. On the other hand, when the angle between the inner peripheral surface 3a and the upper surface of the substrate 2 exceeds 70 degrees, the amount of light totally reflected at the interface between the translucent member 5 and the phosphor layer 6 increases. As a result, when the inner peripheral surface 3a of the frame 3 is tilted within the range as described above, the transmittance from the translucent member 5 to the phosphor layer 6 increases and the phosphor layer 6 has the light emitting element 4 on it. This is preferable because it is easy to make good incident light.

  When the shape of the inner peripheral surface 3 a of the frame 3 is a quadrangular pyramid, it is preferable that at least a pair of opposed inner surfaces be inclined at 35 to 70 degrees with respect to the upper surface of the base 2. Preferably, the entire inner peripheral surface 3 a of the frame 3 is inclined at 35 to 70 degrees with respect to the upper surface of the base 2. Thereby, the light-emitting device 1 can make luminous efficiency very high.

  Next, an example of a method for manufacturing the light emitting device will be described. First, an adhesive is applied to the bonding surface between the base 2 and the frame 3, the frame 3 is placed on the upper surface of the base 2, and then the base 2 and the frame 3 are bonded by completely curing the adhesive. Adhering firmly, a light emitting element storage package is manufactured.

  Thereafter, the light emitting element 4 is mounted on the light emitting element mounting portion 2a on the upper surface of the base 2, and the light emitting element 4 and the wiring conductor 2b are electrically connected via a conductive member using brazing material, solder, metal, or the like. After the thermosetting translucent member 5 is poured into the frame 3 so as to cover the light emitting element 4, the shape of the hole 6 is formed on the liquid uncured translucent member 5. The light-emitting device of the present invention having the hole 6 having a desired shape is obtained by placing the mold formed on the substrate, then heating and completely curing the translucent member 5, and then removing the mold. .

  In addition, the light emitting device of the present invention is provided by arranging one light source as a predetermined light source, or a plurality of light emitting devices, for example, a lattice shape, a staggered shape, a radial shape, or a plurality of light emitting devices. A lighting device can be obtained by installing the light emitting device groups in a circular shape or a polygonal shape so as to have a predetermined arrangement such as a plurality of concentric groups.

  In addition, the light emitting device of the present invention is installed in a predetermined arrangement as a light source, and by installing a reflection jig, an optical lens, a light diffusing plate, etc. optically designed in an arbitrary shape around these light emitting devices, It can be set as the illuminating device which can radiate | emit the light of this light distribution.

  Further, by installing the plurality of light emitting devices 1 in a predetermined arrangement, when the light emitting surface is viewed from the outside, the light emission intensity can be made uniform, and there is a point where the light emission intensity is extremely high in the field of view. It can be set as a difficult lighting device. As a result, the illuminating device of the present invention can irradiate light with a stable radiated light intensity and a radiated light angle, and can be a light source in which unevenness in color and uneven illuminance distribution are suppressed. Thereby, intensity unevenness can be suppressed as compared with the conventional lighting device.

  For example, a plurality of light-emitting devices 101 are arranged in a plurality of rows on the light-emitting device driving circuit base 102 as shown in the plan view and the cross-sectional views shown in FIGS. 9 and 10 and optically designed in an arbitrary shape around the light-emitting device 101. In the case of an illuminating device in which the reflecting jig 103 is installed, in a plurality of light emitting devices 101 arranged on an adjacent row, an arrangement in which the interval between adjacent light emitting devices 101 is not shortest, a so-called staggered pattern It is preferable that That is, when the light emitting devices 101 are arranged in a grid pattern, the glare is strengthened by arranging the light emitting devices 101 as light sources on a straight line, and such a lighting device enters human vision. Thus, discomfort and eye damage are likely to occur, but by forming a staggered pattern, glare is suppressed and discomfort and damage to the eyes of the human eye can be reduced. Further, since the distance between the adjacent light emitting devices 101 is increased, thermal interference between the adjacent light emitting devices 101 is effectively suppressed, and the heat in the light emitting device driving circuit substrate 102 on which the light emitting devices 101 are mounted is reduced. Clouding is suppressed, and heat is efficiently dissipated outside the light emitting device 101. As a result, it is possible to manufacture a long-life lighting device that has little obstacle to human eyes and has stable optical characteristics over a long period of time.

  In addition, the lighting device is a concentric arrangement of a circular or polygonal light emitting device 101 group composed of a plurality of light emitting devices 101 on the light emitting device driving circuit base 102 as shown in the plan view and the sectional view shown in FIGS. In the case of a plurality of lighting devices formed in a group, it is preferable to increase the number of light emitting devices 101 arranged in one circular or polygonal light emitting device 101 group toward the outer peripheral side from the center side of the lighting device. As a result, more light emitting devices 101 can be arranged while maintaining an appropriate interval between the light emitting devices 101, and the illuminance of the lighting device can be further improved. In addition, the density of the light emitting device 101 in the central portion of the lighting device can be reduced to suppress heat accumulation in the central portion of the light emitting device driving circuit base 102. Therefore, the temperature distribution in the light emitting device driving circuit base 102 is uniform, heat is efficiently transmitted to the external electric circuit base or heat sink where the lighting device is installed, and the temperature rise of the light emitting device 101 can be suppressed. As a result, the light-emitting device 101 can operate stably over a long period of time and a long-life lighting device can be manufactured.

  Examples of such lighting devices include general lighting fixtures, chandelier lighting fixtures, residential lighting fixtures, office lighting fixtures, store lighting, display lighting fixtures, street lighting fixtures, used indoors and outdoors. Guide lights and signaling devices, stage and studio lighting, advertising lights, lighting poles, underwater lighting, strobe lights, spotlights, security lights embedded in power poles, emergency lighting, flashlights, Examples include electronic bulletin boards and the like, backlights for dimmers, automatic flashers, displays and the like, moving image devices, ornaments, illuminated switches, optical sensors, medical lights, in-vehicle lights, and the like.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention. For example, an optical lens for arbitrarily collecting and diffusing the light emitted from the light emitting element 4 on the upper surface of the frame body 3 or a flat light-transmitting lid body is joined with solder or a resin adhesive. In addition, the light can be extracted at a desired radiation angle, and the water resistance to the inside of the light emitting device 1 is improved, thereby improving the long-term reliability. Further, the inner peripheral surface 3a of the frame 3 may have a flat (straight) cross-sectional shape or an arc (curved). In the case of the circular arc shape, the light of the light emitting element 4 can be uniformly reflected, and light with high directivity can be uniformly emitted to the outside.

It is sectional drawing which shows an example of embodiment of the light-emitting device of this invention. It is an exploded view of the light-emitting device of FIG. It is sectional drawing which shows the other example of embodiment of the light-emitting device of this invention. It is sectional drawing which shows the other example of embodiment of the light-emitting device of this invention. It is an exploded view of the light-emitting device of FIG. It is sectional drawing which shows the other example of embodiment of the light-emitting device of this invention. (A) (b) is sectional drawing which shows the other various examples of embodiment of the light-emitting device of this invention, respectively. It is sectional drawing which shows the other example of embodiment of the light-emitting device of this invention. It is a top view which shows an example of embodiment of the illuminating device of this invention. It is sectional drawing of the illuminating device of FIG. It is a top view which shows the other example of embodiment of the illuminating device of this invention. It is sectional drawing of the illuminating device of FIG. (A) is sectional drawing of the conventional light-emitting device, (b) is a perspective view of what divided the conventional light-emitting device vertically.

Explanation of symbols

1: Light emitting device 2: Base body 3: Frame body 4: Light emitting element 5: Translucent member 6: Holes 7a, 7b, 7c: Phosphor layer

Claims (5)

A base body having a mounting portion on which the light emitting element is mounted on the upper surface, and a frame body that is attached so as to surround the mounting portion on the upper surface of the base body, and whose inner peripheral surface is a light reflecting surface; In the light emitting device including the light emitting element placed on the mounting portion and a light transmissive member arranged to cover the light emitting element, the light emission on the upper surface of the light transmissive member. A light-emitting device, wherein a hole portion having an inclined surface is partially provided in a portion located immediately above an element. The light emitting device according to claim 1, wherein the hole has an inverted conical shape. The light emitting device according to claim 1, wherein a phosphor layer that converts the wavelength of light from the light emitting element is formed above the hole. The light-emitting device according to claim 1, wherein a phosphor layer that converts the wavelength of light from the light-emitting element is formed on the light reflecting surface. An illuminating device using the light-emitting device according to claim 1 as a light source.

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