JPWO2014083781A1 - Light emitting device, illumination light source, and illumination device - Google Patents

Abstract

A light-transmitting base (21), an LED (22) disposed on the base (21), and a sealing member (23) for sealing the LED (22), the light emitted from the LED (22) A sealing member (23) including a first wavelength conversion material for converting the wavelength of the substrate and a sealing member (23) on the back surface opposite to the main surface on which the LED (22) of the base body (21) is disposed. A wavelength conversion unit (24) provided at an opposing position, the wavelength conversion unit (24) including a second wavelength conversion material that converts the wavelength of light emitted from the LED (22) and transmitted through the substrate (21). And a length d2 of the wavelength converter (24) in the width direction perpendicular to the thickness direction of the base (21) is longer than a length d1 of the sealing member (23) in the width direction.

Description

  The present invention relates to a light emitting device including a light emitting element such as a semiconductor light emitting element and an illumination light source.

  Semiconductor light emitting devices such as LEDs (Light Emitting Diodes) are expected to be new light sources for various lamps because of their high efficiency and long life, and research and development of LED lamps using LEDs as light sources are being promoted.

  As an LED lamp, a bulb-type LED lamp (bulb-shaped LED lamp) that replaces a bulb-type fluorescent lamp and an incandescent bulb, or a straight-tube LED lamp (straight-tube LED lamp) that replaces a straight-tube fluorescent lamp Etc. For example, Patent Document 1 discloses a conventional bulb-type LED lamp. Patent Document 2 discloses a conventional straight tube LED lamp.

  In the LED lamp, an LED module (light emitting device) in which a plurality of LEDs are mounted on a substrate is used as a light source.

JP 2006-313717 A JP 2009-043447 A

  In recent years, a light bulb-type LED lamp having a configuration simulating an incandescent bulb in light emission characteristics and appearance has been studied. For example, a bulb-type LED lamp having a configuration in which an LED module is held in a hollow state at a central position in the globe using a globe (glass bulb) used in an incandescent bulb has been proposed.

  More specifically, the LED module is fixed to the top of the column using a column (stem) extending from the globe opening toward the center of the globe. The LED module includes, for example, a substrate, a plurality of LED chips mounted on the surface of the substrate in a plurality of rows, and a sealing member that collectively seals the LED chips for each row. As the sealing member, for example, a phosphor-containing resin is used.

  In the LED module having such a structure, for example, blue light from each LED chip is wavelength-converted by the phosphor of the sealing member, and as a result, white light is emitted from the sealing member.

  At this time, even if the substrate is not transparent, part of the blue light from each LED chip may be transmitted through the substrate and emitted outward from the back surface of the substrate. In this case, color unevenness in light emission from the LED module is observed.

  In consideration of the above-described conventional problems, the present invention provides a light-emitting device and a light source for illumination that have a configuration in which light from a light-emitting element is wavelength-converted and emitted to the outside, and color unevenness can be suppressed. With the goal.

  In order to achieve the above object, a light-emitting device according to one embodiment of the present invention includes a light-transmitting base, a light-emitting element disposed on a main surface of the base, and a sealing member that seals the light-emitting element. And a sealing member including a first wavelength conversion material that converts a wavelength of light emitted from the light emitting element, and a back surface that is a surface opposite to the main surface of the base, facing the sealing member. A wavelength conversion unit provided at a position to include a wavelength conversion unit including a second wavelength conversion material that converts a wavelength of light emitted from the light emitting element and transmitted through the substrate, of the wavelength conversion unit, The length in the width direction orthogonal to the thickness direction of the base is longer than the length in the width direction of the sealing member.

  Further, in the light emitting device according to one aspect of the present invention, the size of the wavelength conversion unit in a plane perpendicular to the thickness direction of the base body is determined when the base member is seen through from the direction of the main surface. It is good also as a magnitude | size containing.

  Further, in the light bulb shaped lamp according to one aspect of the present invention, a plurality of light emitting elements including the light emitting elements are arranged in at least one row on the main surface of the base, and the sealing member is The wavelength converter is provided so as to form at least one row according to the arrangement of the plurality of light emitting elements, and the wavelength conversion unit forms at least one row according to the arrangement of the sealing members. It may be provided.

  Moreover, in the light emitting device according to one aspect of the present invention, the base has a housing portion that forms a space that houses at least a part of the sealing member, and the bottom surface of the housing portion, which is the main surface, The light emitting element may be disposed.

  In the light-emitting device according to one embodiment of the present invention, when the length in the width direction of the sealing member is d1, and the length in the width direction of the wavelength conversion unit is d2, d2 is d1 It may be 1.5 times or more and 4 times or less of d1.

  Moreover, the light-emitting device which concerns on 1 aspect of this invention WHEREIN: The said sealing member is formed with wavelength conversion material containing resin containing said 1st wavelength conversion material, The said wavelength conversion part is said 2nd wavelength conversion material. It is good also as being formed with the glass sintered compact containing.

  An illumination light source according to an aspect of the present invention includes the light-emitting device according to any one of the above aspects, a translucent glove, and a support column provided to extend inward of the glove. The light emitting device is fixed to the column so as to be disposed in the globe.

  An illumination device according to one embodiment of the present invention includes the illumination light source.

  According to the present invention, it is possible to provide a light-emitting device and an illumination light source that have a configuration in which light from a light-emitting element is wavelength-converted and emitted to the outside, and generation of color unevenness can be suppressed.

FIG. 1 is a front view of a light bulb shaped lamp according to an embodiment. FIG. 2 is an exploded perspective view of the light bulb shaped lamp according to the embodiment. FIG. 3 is a cross-sectional view of the light bulb shaped lamp according to the embodiment. FIG. 4 is a diagram illustrating a configuration of the LED module according to the embodiment. FIG. 5 is a diagram illustrating a configuration of an LED module according to the first modification of the embodiment. FIG. 6 is a diagram illustrating a configuration of the LED module according to the second modification of the embodiment. FIG. 7 is a diagram illustrating a configuration of an LED module according to Modification 3 of the embodiment. FIG. 8 is a diagram illustrating a configuration of an LED module according to Modification 4 of the embodiment. FIG. 9 is a schematic cross-sectional view of the illumination device according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  The embodiment described below shows a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims are described as arbitrary constituent elements.

[Overall configuration of bulb-type lamp]
First, the whole structure of the light bulb shaped lamp 1 according to the embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view of a light bulb shaped lamp 1 according to an embodiment. FIG. 2 is an exploded perspective view of the light bulb shaped lamp 1 according to the embodiment. FIG. 3 is a cross-sectional view of the light bulb shaped lamp 1 according to the embodiment.

  In FIG. 1, the alternate long and short dash line drawn along the vertical direction of the drawing indicates the lamp axis J (center axis) of the bulb-type lamp 1. The lamp axis J is an axis serving as a rotation center when the light bulb shaped lamp 1 is attached to a socket of a lighting device (not shown), and coincides with the rotation axis of the base 30.

  The light bulb shaped lamp 1 is an example of a light source for illumination, and is a light bulb shaped LED lamp that is a substitute for a light bulb shaped fluorescent light or an incandescent light bulb.

  In FIG. 3, the lighting circuit 80 is not a cross-sectional view but a front view.

  The light bulb shaped lamp 1 includes a translucent globe 10, an LED module 20 that is a light source, a base 30 that receives electric power from the outside of the lamp, a support column 40, a support plate 50, a resin case 60, and lead wires 70. And a lighting circuit 80.

  In the light bulb shaped lamp 1, an envelope is constituted by the globe 10, the resin case 60 and the base 30.

  Hereinafter, each component of the light bulb shaped lamp 1 according to the present embodiment will be described.

[Glove]
The globe 10 is a translucent cover that houses the LED module 20 and transmits light from the LED module 20 to the outside of the lamp. The light of the LED module 20 that has entered the inner surface of the globe 10 passes through the globe 10 and is extracted to the outside of the globe 10.

  The globe 10 in the present embodiment is made of a material that is transparent to the light from the LED module 20. As such a globe 10, for example, a glass valve (clear valve) made of silica glass that is transparent to visible light is employed.

  In this case, the LED module 20 housed in the globe 10 can be viewed from the outside of the globe 10.

  The globe 10 is not necessarily transparent to visible light, and the globe 10 may have a light diffusion function. For example, a milky white light diffusing film may be formed by applying a resin or a white pigment containing a light diffusing material such as silica or calcium carbonate to the entire inner surface or outer surface of the globe 10. Further, the material of the globe 10 is not limited to a glass material, and a resin material such as a synthetic resin such as acrylic (PMMA) or polycarbonate (PC) may be used.

[LED module]
The LED module 20 includes an LED (LED chip) 22 that is an example of a light emitting element, and is a light emitting module (light emitting device) that emits light when electric power is supplied to the LED 22 via a lead wire 70.

  The LED module 20 is held in the globe 10 by the support column 40.

  The LED module 20 is preferably disposed at a spherical center position formed by the globe 10 (for example, inside the large diameter portion where the inner diameter of the globe 10 is large).

  Thus, by arranging the LED module 20 at the center position of the globe 10, the light distribution characteristic of the light bulb shaped lamp 1 becomes a light distribution characteristic similar to a general incandescent light bulb using a conventional filament coil. .

  Further, the LED module 20 of the present embodiment includes a base 21 having translucency, an LED 22 disposed on the main surface of the base 21, a sealing member 23 for sealing the LED 22, and a main surface of the base 21. Includes a wavelength conversion unit 24 disposed on the back surface which is the opposite surface.

  The base 21 is a substrate having a thickness of about 1 mm, for example. In the present embodiment, a white alumina substrate having a light reflectance of 70% or more is employed as the base 21.

  In addition, the raw material of the base | substrate 21 with which the LED module 20 is provided is not limited to an alumina. For example, a translucent ceramic substrate made of aluminum nitride, a transparent glass substrate, a substrate made of crystal, a sapphire substrate, or a resin substrate can be adopted as the base 21.

  Further, instead of the rigid substrate, a flexible substrate or a rigid flexible substrate can be adopted as the base 21.

  A plurality of LEDs 22 are arranged in at least one row on the main surface of the base 21, and the sealing member 23 forms at least one row in accordance with the arrangement of the plurality of LEDs 22. Is provided. Moreover, the wavelength conversion part 24 is provided so that at least 1 row | line | column may be formed according to arrangement | positioning of the sealing member 23. FIG.

  In the present embodiment, as shown in FIG. 1 and FIG. 2, a plurality of LEDs 22 are arranged in two rows on the main surface of the base 21, and correspondingly, two rows of sealing members are arranged on the main surface side. 23, and two rows of wavelength converters 24 are provided on the back side.

  That is, in the present embodiment, the wavelength conversion unit 24 is provided at each of the positions on the back surface of the base body 21 facing the two rows of sealing members 23 on the main surface.

  Note that the number of columns of the sealing member 23 and the wavelength conversion unit 24 is not limited to two. For example, one or three or more rows of sealing members 23 and wavelength converters 24 may be arranged on the base 21 corresponding to the LEDs 22 arranged in one or three or more rows.

  The sealing member 23 includes a first wavelength conversion material that converts the wavelength of light emitted from the LED 22, and the wavelength conversion unit 24 converts the wavelength of light emitted from the LED 22 and transmitted through the substrate 21. A second wavelength converting material is included.

  In the LED module 20 of the present embodiment, the occurrence of color unevenness in light emission from the LED module 20 is suppressed by the sealing member 23 and the wavelength conversion unit 24 each including a wavelength conversion material.

  Details of the configuration of the LED module 20 will be described later with reference to FIG.

[Base]
The base 30 is a power receiving unit that receives power for causing the LEDs of the LED module 20 to emit light from the outside of the light bulb shaped lamp 1. The base 30 receives AC power through two contacts, and the power received by the base 30 is input to the power input unit of the lighting circuit 80 via a lead wire.

  For example, AC power is supplied to the base 30 from a commercial power supply (AC 100 V). Specifically, the base 30 is attached to a socket of a lighting fixture (lighting device) and receives AC power from the socket. Thereby, the light bulb shaped lamp 1 (LED module 20) is turned on.

  The type of the base 30 is not particularly limited, but in the present embodiment, a screwed type Edison type (E type) base is used. Examples of the E-type base adopted as the base 30 include an E26 type, an E17 type, and an E16 type.

[Support]
The column 40 is a metal stem (metal column) provided so as to extend from the vicinity of the opening 11 of the globe 10 toward the inside of the globe 10. The support column 40 functions as a support member that supports the LED module 20 in the globe 10. One end of the column 40 is connected to the LED module 20, and the other end is connected to the support plate 50.

  The support column 40 also functions as a heat radiating member for radiating heat generated in the LED module 20 to the base 30 side. Therefore, by configuring the support column 40 as a main component of a metal material having a high thermal conductivity, for example, aluminum (Al) having a thermal conductivity of about 237 [W / m · K], the heat dissipation efficiency of the support column 40 can be improved. it can.

  As a result, it is possible to suppress a decrease in luminous efficiency and lifetime of the LED 22 due to a temperature rise.

  As a metal material of the support column 40, copper (Cu), iron (Fe), or the like may be employed in addition to the aluminum alloy. Further, a resin instead of metal may be employed as the material of the support column 40.

  For example, when a highly transparent resin such as acrylic is used as the material of the support column 40, light emitted from the LED module 20 can be transmitted through the support column 40 and emitted to the outside of the globe 10. .

  Further, as the support column 40, a support column made of a resin or the like and having a metal film formed thereon may be employed.

  The support column 40 includes, for example, a main shaft portion 41 and a fixed portion 42 as an integral unit. The main shaft portion 41 is a cylindrical member having a constant cross-sectional area.

  The fixing portion 42 has an end surface to which the LED module 20 is fixed, and this end surface abuts on the back surface of the base 21 of the LED module 20. The fixing portion 42 further has a protruding portion that protrudes from the end surface, and this protruding portion is fitted into a through-hole provided in the base 21 of the LED module 20.

  Furthermore, the LED module 20 and the end surface of the fixing portion 42 are bonded to each other with a resin adhesive such as silicone resin.

  Thus, in the present embodiment, the LED module 20 is supported by the support column 40 in a state where the back surface of the base 21 is in contact with the end surface of the support column 40. Thereby, the heat dissipation efficiency of the LED module 20 is enhanced, and as a result, it is possible to suppress the decrease in the light emission efficiency and the lifetime of the LED 22 due to the temperature rise.

[Support plate]
The support plate 50 is a member that supports the support column 40 and is fixed to the resin case 60. The support plate 50 is connected to the opening end of the opening 11 of the globe 10 so as to close the opening 11 of the globe 10.

  Specifically, the support plate 50 is a disk-shaped member having a stepped portion on the periphery, and the opening end of the opening 11 of the globe 10 is in contact with the stepped portion. And in this level | step-difference part, the support plate 50, the resin case 60, and the opening end of the opening part 11 of the globe 10 are adhere | attached with the adhesive agent.

  Similarly to the support column 40, the support plate 50 is made of a metal material having high thermal conductivity such as aluminum, so that the heat radiation efficiency of the LED module 20 that conducts the support column 40 by the support plate 50 is increased. As a result, it is possible to further suppress the decrease in the light emission efficiency and the lifetime of the LED due to the temperature rise. In addition, the support plate 50 and the support | pillar 40 may be integrally shape | molded by the same metal mold | die.

[Resin case]
The resin case 60 is an insulating case (circuit holder) for insulating the support column 40 and the base 30 and accommodating the lighting circuit 80. The resin case 60 is composed of a large-diameter cylindrical first case portion 61 and a small-diameter cylindrical second case portion 62. The resin case 60 is formed by, for example, polybutylene terephthalate (PBT).

  Since the outer surface of the first case portion 61 is exposed to the outside air, the heat conducted to the resin case 60 is mainly radiated from the first case portion 61. The second case portion 62 is configured such that the outer peripheral surface is in contact with the inner peripheral surface of the base 30, and a screwing portion for screwing with the base 30 is formed on the outer peripheral surface of the second case portion 62. ing.

[Lead]
The two lead wires 70 are a pair of lead wires for supplying power for lighting the LED module 20 from the lighting circuit 80 to the LED module 20. As the lead wire 70, for example, an electric wire in which a wire metal wire such as a copper wire is covered with an insulating resin is employed.

  Each lead wire 70 is disposed in the globe 10, one end is electrically connected to the external terminal of the LED module 20, and the other end is electrically connected to the power output unit of the lighting circuit 80. In other words, the other end is electrically connected to the base 30.

[Lighting circuit]
The lighting circuit 80 is a drive circuit (circuit unit) for lighting the LEDs of the LED module 20 and is covered with a resin case 60. The lighting circuit 80 converts AC power fed from the base 30 into DC power, and supplies the converted DC power to the LEDs of the LED module 20 via the two lead wires 70.

  The lighting circuit 80 includes, for example, a circuit board and a plurality of circuit elements (electronic components) mounted on the circuit board. The circuit board is a printed board on which metal wiring is patterned, and electrically connects a plurality of circuit elements mounted on the circuit board. In the present embodiment, the circuit board is arranged in a posture in which a main surface on which a plurality of circuit elements are arranged is orthogonal to the lamp axis J.

  The plurality of circuit elements include, for example, various capacitors, resistor elements, rectifier circuit elements, coil elements, choke coils (choke transformers), noise filters, diodes, or integrated circuit elements.

  The light bulb shaped lamp 1 does not necessarily need to include the lighting circuit 80. For example, when direct-current power is directly supplied to the light bulb shaped lamp 1 from a lighting fixture or a battery, the light bulb shaped lamp 1 may not include the lighting circuit 80. The lighting circuit 80 is not limited to a smoothing circuit, and can be configured by appropriately selecting and combining a dimming circuit and a booster circuit.

[Details of LED module configuration]
Next, a characteristic configuration of the LED module 20 according to the present embodiment will be described with reference to FIG.

  FIG. 4 is a diagram illustrating a configuration of the LED module 20 according to the embodiment.

  4A is a side view of the LED module 20 (a view of the LED module 20 viewed from the LED 22 arrangement direction (X-axis direction)), and FIG. 4B is an LED module 20. FIG. 2 is a top view of the LED module 20 as viewed from the main surface side (positive side in the Z-axis direction).

  In the present embodiment, as described above, the base 21 is provided with the two rows of sealing members 23 and the two rows of wavelength converters 24 corresponding to the LEDs 22 arranged in two rows. Yes. However, in order to clearly describe the features of the LED module 20, the features of the LED module 20 will be described by paying attention to the LED 22, the sealing member 23, and the wavelength conversion unit 24 for one row as shown in FIG.

  In the LED module 20, the plurality of LEDs 22 arranged in a row are connected in series, for example, with a wiring (not shown), and emit light when energized through electrodes provided at both ends thereof.

  Each of these LEDs 22 is a bare chip that emits monochromatic visible light, and is die-bonded to the main surface of the substrate 21 with a light-transmitting die attach agent (die bond agent). That is, the LED module 20 according to the present embodiment has a COB (Chip On Board) structure.

  As each LED 22, for example, a blue LED chip that emits blue light is employed. As the blue LED chip, for example, a gallium nitride based semiconductor light emitting element having a center wavelength of 440 nm to 470 nm, which is made of an InGaN based material, is used.

  The sealing member 23 includes a first wavelength conversion material that collectively seals the plurality of LEDs 22 arranged in one row and converts the wavelength of light emitted from the LEDs 22.

  In the present embodiment, the sealing member 23 is formed of a phosphor-containing resin in which predetermined phosphor particles are contained as a first wavelength conversion material in a predetermined resin.

  In addition, as predetermined resin, translucent materials, such as a silicone resin, are employ | adopted, for example. As the predetermined phosphor particles, for example, YAG (yttrium, aluminum, garnet) yellow phosphor particles are employed.

  The yellow phosphor particles emit yellow light when excited by blue light from the LED 22. As a result, white light obtained by the yellow light and the blue light from the LED 22 is emitted.

  Here, as described above, when a white alumina substrate having a light reflectance of 70% or more is adopted as the base 21 as described above, the base 21 is not transparent but has translucency, And thickness is also about 1 mm.

  Therefore, blue light from the LEDs 22 arranged on the main surface is transmitted through the base 21 and emitted from the back surface. Specifically, light traveling from the LED 22 toward the base 21 and light diffused or reflected in the sealing member 23 enters the base 21.

  The light that has entered the substrate 21 is scattered, for example, at the crystal grain boundaries of the alumina polycrystal constituting the substrate 21 and is emitted to the outside from the back surface of the substrate 21. As a result, when it is assumed that no countermeasure is taken on the back surface of the base body 21, the blue light leaking from the back surface of the base body 21 is mixed with the white light emitted through the sealing member 23. Color unevenness in light emission from 20 is observed.

  However, in the LED module 20 of the present embodiment, the wavelength conversion unit 24 is disposed on the back surface of the base 21.

  Moreover, the wavelength conversion part 24 in this Embodiment is formed of the sintered compact containing the predetermined fluorescent substance particle as a 2nd wavelength conversion material.

  Specifically, in the present embodiment, the wavelength conversion unit 24 is a fluorescent material in which YAG-based yellow phosphor particles are contained in a binder for sintering made of an inorganic material such as low-melting glass or sol-gel glass. It is formed of a body glass sintered body.

  The wavelength conversion unit 24 having such a configuration is, for example, a paste obtained by kneading a second wavelength conversion material, a sintering binder, a solvent, or the like, after printing or applying the paste on the back surface of the base 21. Formed by tying.

  Since the wavelength conversion unit 24 is disposed on the back surface of the base body 21, the blue light that has reached the back surface of the base body 21 through the inside of the base body 21 includes wavelength conversion that includes yellow phosphor particles as the second wavelength conversion material. The unit 24 converts the light into white light. As a result, occurrence of color unevenness in light emission from the LED module 20 is suppressed.

  For example, in FIG. 4A, the thickness of the wavelength converter 24 is shown to be constant. However, the thickness of the wavelength conversion unit 24, which is a phosphor glass sintered body, does not become zero at a certain point when scanning toward the outside, but there is a portion that gradually becomes thinner.

  Moreover, the effect of suppressing color unevenness by the wavelength conversion unit 24 is improved by dealing with weak blue light transmitted through the peripheral portion of the wavelength conversion unit 24 with a small amount of phosphor.

  Further, fine irregularities are formed on the surface of the wavelength conversion section 24, and the flatness is 1 μm or more. By having such irregularities on the surface of the wavelength conversion unit 24, it is possible to disperse light that reaches the back surface of the base 21 and transmits through the wavelength conversion unit 24 in all directions, thereby suppressing color unevenness. The effect has been improved.

  In addition, the sealing member 23 and the wavelength conversion part 24 may be formed with the same material. That is, the wavelength conversion unit 24 may be formed of a phosphor-containing resin. In this case, for example, the type or concentration of the phosphor or resin contained in the sealing member 23 and the wavelength conversion unit 24 may be the same or different.

  Further, the color of light emitted from the wavelength conversion unit 24 by adjusting the concentration of the phosphor particles contained in the material forming the wavelength conversion unit 24 or adjusting the height of the wavelength conversion unit 24 or the like. Can be adjusted.

  For example, when the same phosphor-containing resin is used as the material for the sealing member 23 and the wavelength conversion unit 24 from the viewpoint of suppressing production costs, the wavelength conversion unit 24 is adjusted by adjusting the height of the wavelength conversion unit 24. The color of the light emitted through it can be adjusted. That is, by adjusting the height of the wavelength conversion unit 24, the color of light emitted from the back surface side of the base 21 can be made closer to the color of light emitted from the main surface side of the base 21.

  Further, as a part of the material of the sealing member 23, an organic material such as a fluorine-based resin may be used instead of the above-described translucent material such as silicone resin, an inorganic material such as low-melting glass or sol-gel glass, or the like May be used. Further, a light diffusing material such as silica particles may be dispersed in the sealing member 23 and the wavelength conversion unit 24.

  Furthermore, the length in the width direction of the wavelength conversion unit 24 in the present embodiment perpendicular to the thickness direction of the base 21 is longer than the length in the width direction of the sealing member 23.

  For example, as shown in FIG. 4A, when the length in the width direction of the sealing member 23 is d1 and the length in the width direction of the wavelength conversion unit 24 is d2, d1 <d2.

  In this case, the width direction is defined as a direction orthogonal to the thickness direction (Z-axis direction) of the base body 21 and a direction orthogonal to the arrangement direction of the LEDs 22 (X-axis direction) (Y-axis direction). .

  As described above, since the length d2 in the width direction of the wavelength conversion section 24 is longer than the length d1 in the width direction of the sealing member 23, the blue light diffused in the base 21 as described above remains as it is. Leakage from the back surface is suppressed.

  In the present embodiment, the width of the wavelength conversion unit 24 in the longitudinal direction (the X-axis direction is the same as the LED 22 arrangement direction) is longer than the width of the sealing member 23 in the longitudinal direction (X-axis direction).

  More specifically, in the present embodiment, as shown in FIG. 4B, the size of the wavelength converter 24 in a plane (XY plane) orthogonal to the thickness direction of the base 21 is such that the base 21 is the main surface. When seen through from the direction, the size includes the sealing member 23.

  That is, the wavelength conversion unit 24 is provided on the back surface of the base 21 so as to cover a region corresponding to the lower part of the sealing member 23. Therefore, the leakage of blue light from the back surface of the base 21 is more reliably suppressed.

  In the present embodiment, as shown in FIG. 4B, the two-dimensional shape in the XY plane of the wavelength converter 24 is an oval shape with rounded corners. In this case, for example, variation in distance from each of the LEDs 22 at both ends of the plurality of LEDs 22 arranged in a line to the curved portions at both ends of the wavelength conversion unit 24 is reduced. Thereby, for example, color unevenness or brightness unevenness in light emitted outward through these curved portions is suppressed.

  Further, the two-dimensional shape in the XY plane of the wavelength conversion unit 24 may be other than the oval shape, for example, a rectangle.

  Here, in order to further improve the suppression effect on the leakage of blue light from the back surface of the base body 21, for example, the wavelength conversion unit covers the entire back surface of the base body 21 (excluding the region connected to the support column 40). It is also possible to arrange 24.

  However, in this case, yellow light emitted from the yellow phosphor particles is dominant in appearance at a position away from the lower side of the sealing member 23, and as a result, in the LED module 20, color unevenness due to the yellow light is caused. May occur.

  Therefore, it is desirable that the length d2 in the width direction of the wavelength conversion unit 24 is equal to or less than the length in the width direction of the back surface of the base 21 and within a predetermined range.

  Specifically, as a result of intensive studies, the inventors of the present application have determined that the length d2 of the wavelength conversion portion 24 in the width direction is 1.5 times or more the length d1 of the sealing member 23 in the width direction, and It has been found that the ratio is 4 times or less from the viewpoint of suppressing the occurrence of color unevenness.

  For example, the base 21 is a white alumina substrate having a thickness of 1 mm, the sealing member 23 is formed of a phosphor-containing resin in which YAG-based yellow phosphor particles are contained in a silicone resin, and the wavelength conversion unit 24 is In the case where the phosphor glass sintered body is used, the dimensions of the constituent elements are exemplified as follows.

  The length d1 in the width direction of the sealing member 23 is 1.7 mm, and the length d2 in the width direction of the wavelength conversion unit 24 is 4.0 mm. Moreover, the height of the sealing member 23 is 0.5 mm, and the height of the wavelength conversion part 24 is 0.02 mm.

  In this LED module 20, the horizontal width (Y-axis direction) of the LED 22 is about 0.4 to 1.0 mm, the vertical width (X-axis direction) is about 0.5 to 1.0 mm, and the height (Z-axis direction) is About 0.1 to 0.5 mm.

  As described above, the LED module 20 according to the present embodiment includes the base 21 having translucency, the LED 22 disposed on the main surface of the base 21, the sealing member 23 that seals the LED 22, and the base 21. The wavelength conversion part 24 provided in the position which opposes the sealing member 23 of the back surface of this is provided.

  The sealing member 23 includes a first wavelength conversion material that converts the wavelength of light emitted from the LED 22, and the wavelength conversion unit 24 includes a second wavelength conversion material that converts the wavelength of light emitted from the LED 22 and transmitted through the base 21. Including.

  Further, the length of the wavelength conversion unit 24 in the width direction orthogonal to the thickness direction of the base 21 is longer than the length of the sealing member 23 in the width direction.

  The LED module 20 adopts the above configuration, so that the color of light emitted from the back surface side of the base 21 is changed to light emitted from the main surface side of the base 21, that is, light emitted from the sealing member 23. It becomes possible to match to the color of. As a result, occurrence of color unevenness in light emission from the LED module 20 is suppressed.

  Further, by using an inexpensive white substrate such as a white alumina substrate as the base 21, it is possible to obtain the LED module 20 in which cost reduction is realized and color unevenness is suppressed.

  Moreover, the wavelength conversion part 24 can be formed with a fluorescent substance glass sintered compact. That is, the wavelength conversion unit 24 is realized by the sintered body film formed on the back surface of the base 21. Therefore, for example, when the LED 22 is mounted on the main surface of the base body 21, it is easy to support the base body 21 from below.

  Further, when the sealing member 23 and the wavelength conversion unit 24 are formed of a common material (for example, the above-described phosphor-containing resin), for example, the production cost of the LED module 20 can be suppressed or the production efficiency can be improved. .

  The light bulb shaped lamp 1 of the present embodiment includes an LED module 20, a translucent globe 10, and a support column 40 provided so as to extend inward of the globe 10, and the LED module 20 includes: , Fixed to the support column 40 so as to be disposed in the globe 10.

  With this configuration, for example, a light bulb shaped lamp 1 having light distribution characteristics similar to an incandescent light bulb is realized.

(Modification 1)
Next, a first modification of the embodiment will be described with reference to FIG.

  FIG. 5 is a diagram illustrating a configuration of the LED module 20a according to the first modification of the embodiment.

  5A is a side view of the LED module 20a, and FIG. 5B is a top view of the LED module 20a.

  In the LED module 20 a according to the first modification shown in FIG. 5, only one LED 22 is disposed on the base 21 as a light emitting element. In addition, the sealing member 23 seals the one LED 22, and the wavelength conversion unit 24 is disposed on the back surface of the base 21 at a position facing the sealing member 23.

  Further, the length d2 of the wavelength conversion unit 24 in the width direction is longer than the length d1 of the sealing member 23 in the width direction. As shown in FIG. 5B, when the two-dimensional shape in the XY plane of the sealing member 23 is a circle having a diameter d1, the two-dimensional shape in the XY plane of the wavelength conversion unit 24 is, for example, a diameter d2. The circle. The two-dimensional shape in the XY plane of the wavelength conversion unit 24 may be a shape other than a circle such as a rectangle.

  Thus, even if the LED module 20a includes only one light emitting element (LED 22), the sealing member 23 and the wavelength conversion unit 24 are arranged as shown in FIG. Generation of unevenness is suppressed.

(Modification 2)
Next, Modification 2 of the embodiment will be described with reference to FIG.

  FIG. 6 is a diagram illustrating a configuration of an LED module 20b according to the second modification of the embodiment.

  Specifically, FIG. 6 is a diagram showing a part of a cross section parallel to the ZY plane of the LED module 20b.

  The base 21 provided in the LED module 20b shown in FIG. 6 has a recessed portion 21a formed in a recessed shape on the back surface, and the wavelength converting portion 24 is disposed inside the recessed portion 21a. Further, the length d2 of the wavelength conversion unit 24 in the width direction is longer than the length d1 of the sealing member 23 in the width direction.

  For example, the same phosphor-containing resin as that of the sealing member 23 is poured into the recessed portion 21a, so that the wavelength converting portion 24 is formed inside the recessed portion 21a.

  Thus, by providing the recess 21a on the back surface of the base body 21, for example, when the wavelength conversion unit 24 is formed on the back surface of the base body 21, the restriction on the size and position on the XY plane is facilitated. And the suppression effect with respect to generation | occurrence | production of a color nonuniformity is maintained.

  Note that the entire wavelength conversion unit 24 does not need to be disposed inside the recess 21a. For example, a part of the wavelength conversion unit 24 is exposed outside the recess 21a (downward in FIG. 6). It may be. That is, the height (width in the Z-axis direction) of the wavelength conversion unit 24 does not need to match the depth of the recessed portion 21a, and may be longer or shorter than the depth.

  Further, in the LED module 20b, as in the LED module 20 according to the embodiment, a plurality of LEDs 22 may be arranged in the X-axis direction (direction perpendicular to the paper surface of FIG. 6). Further, the LED module 20b may include only one LED 22 as a light emitting element, like the LED module 20a according to the first modification.

(Modification 3)
Next, Modification 3 of the embodiment will be described with reference to FIG.

  FIG. 7 is a diagram illustrating a configuration of an LED module 20c according to the third modification of the embodiment.

  Specifically, FIG. 7 is a diagram showing a cross section parallel to the ZY plane of the LED module 20c.

  The base 21 provided in the LED module 20c shown in FIG. 7 has a housing part 21b that forms a space for housing the sealing member 23, and the LEDs 22 are arranged on the bottom surface of the housing part 21b that is the main surface.

  That is, the LED module 20c has a configuration similar to a package-type LED element in which an LED chip is mounted in a resin package having a cavity (concave portion).

  In the LED module 20 c, the length d <b> 2 in the width direction of the wavelength conversion unit 24 is longer than the length d <b> 1 in the width direction of the sealing member 23.

  According to this configuration, in the LED module 20c, for example, when the sealing member 23 is formed, the restriction on the size and position on the XY plane is facilitated, and the suppression effect on the occurrence of color unevenness is maintained. The

(Modification 4)
Next, Modification 4 of the embodiment will be described with reference to FIG.

  FIG. 8 is a diagram illustrating a configuration of an LED module 20d according to Modification 4 of the embodiment.

  Specifically, FIG. 8 is a diagram showing a cross section parallel to the ZY plane of the LED module 20d.

  The LED module 20d shown in FIG. 8 has a housing portion 21b that forms a space for housing the sealing member 23, as in the LED module 20c according to the third modification shown in FIG. LED22 is arrange | positioned at the bottom face of the accommodating part 21b.

  The LED module 20d according to the modification 4 further includes a groove 21c in which a material including a wavelength conversion material is disposed. Specifically, the groove portion 21 c is disposed on the base body 21 at a position where light emitted from the LED 22 passes through a part of the base body 21 and the groove portion 21 c and is emitted from the side surface of the base body 21.

  Moreover, in this modification, the wavelength conversion part 24 arrange | positioned inside the recessed part 21a, for example, fluorescent substance containing resin has approached the inside of the groove part 21c, and, thereby, passes the groove part 21c. Wavelength conversion of light is performed.

  That is, a part of the wavelength conversion unit 24 is emitted from the side surface of the base body 21 by converting the wavelength emitted by the second wavelength conversion material when the light emitted from the LED 22 passes through the base body 21. It can also be expressed as being arranged at a position where

  The LED module 20 d has the above-described configuration, so that not only color unevenness caused by light emitted from the back surface of the base 21 but also color unevenness caused by light emitted from the side surface of the base 21 is suppressed. can do.

  In each of the LED modules 20c and 20d according to the modified examples 3 and 4, the wavelength conversion unit 24 does not need to be disposed inside the recessed portion 21a provided on the back surface of the base 21. In each of the LED modules 20c and 20d, the wavelength conversion unit 24 may be formed in a convex shape on the back surface of the base 21 where the recess 21a does not exist, as in the embodiment (for example, FIG. 4A). reference).

  In Modifications 3 and 4, the entire sealing member 23 does not need to be accommodated in the accommodating portion 21b. For example, a part of the sealing member 23 is located outside the accommodating portion 21b (see FIGS. 8 may be exposed. That is, the height (width in the Z-axis direction) of the sealing member 23 does not have to coincide with the depth of the accommodating portion 21b, and may be longer or shorter than the depth.

  Further, in the LED modules 20c and 20d, a plurality of LEDs 22 may be arranged in the X-axis direction (a direction perpendicular to the paper surface of FIG. 5), similarly to the LED module 20 according to the embodiment. In addition, the LED modules 20c and 20d may include only one LED 22 as a light emitting element, similarly to the LED module 20a according to the first modification.

  Moreover, each of LED module 20a-20d which concerns on said modification 1-4 can be employ | adopted as a light-emitting device in the light bulb shaped lamp of the same shape as said light bulb shaped lamp 1, for example.

(Other)
Although the LED module and the light bulb shaped lamp according to the present invention have been described based on the embodiments and the modifications thereof, the present invention is not limited to these embodiments and modifications.

  For example, in the above-described embodiments and modifications, the LED modules 20, 20a, 20b, 20c, and 20d (hereinafter referred to as “LED module 20 etc.”) include the LEDs 22 that are blue LED chips.

  Each of the sealing member 23 and the wavelength conversion unit 24 included in the LED module 20 and the like includes yellow phosphor particles as a wavelength conversion material. That is, in the LED module 20 or the like, white light is emitted by a combination of a blue LED chip (LED 22) and yellow phosphor particles.

  However, the combination of the emission color of the LED 22 and the type of wavelength conversion material is not limited to this.

  For example, the LED module 20 or the like may employ a red phosphor and a green phosphor as wavelength conversion materials, and emit white light by combining this with the LED 22 that is a blue LED chip.

  Further, as the LED 22, an LED chip that emits a color other than blue may be employed. For example, when an LED chip that emits ultraviolet rays is used as the LED 22, a combination of phosphor particles that emit light in three primary colors (red, green, and blue) is employed as the phosphor particles that are employed as the wavelength conversion material.

  Furthermore, materials other than the phosphor particles may be employed as the wavelength conversion material. For example, a material containing a substance that absorbs light of a certain wavelength and emits light of a wavelength different from the absorbed light, such as a semiconductor, a metal complex, an organic dye, or a pigment, may be used as the wavelength conversion material.

  Moreover, in said embodiment and modification, it was supposed that LED chip (LED22) was employ | adopted as a light emitting element which is light sources, such as LED module 20. FIG. However, a semiconductor light emitting element such as a semiconductor laser, an organic EL (Electro Luminescence), an inorganic EL, or the like may be employed as the light emitting element included in the LED module 20 or the like.

  In the above embodiment, the size of the globe 10 is larger than the size of the resin case 60 (see, for example, FIG. 1). However, for example, the above-described LED module 20 or the like can also be employed as a light emitting device for a light bulb shaped lamp in which the size of the globe 10 is smaller than the size of the resin case 60.

  In the above-described embodiment, the light bulb shaped lamp 1 employing the LED module 20 as a light emitting device has been described. However, the LED module 20 according to the embodiment and the modified example includes a straight tube lamp, a round lamp, or the like. It may be employed as a light emitting device in the illumination light source. Further, the LED module 20 or the like may be used as a light emitting device in equipment other than the lamp.

  Moreover, this invention can also be implement | achieved not only as an illumination light source provided with either of the LED modules 20 grade | etc., But as an illuminating device provided with the said light source for illumination.

  For example, this invention can be comprised as an illuminating device provided with said lightbulb-shaped lamp 1 and the lighting fixture to which the said lightbulb-shaped lamp 1 is attached.

  In this case, the lighting fixture is a fixture that turns off and turns on the illumination light source, and includes, for example, a fixture body attached to the ceiling and a cover that covers the illumination light source. Of these, the appliance main body has a socket for powering the illumination light source as well as a base for the illumination light source.

  An example of an illuminating device provided with the light source for illumination is demonstrated using FIG.

  FIG. 9 is a schematic cross-sectional view of an illumination device 2 including the light bulb shaped lamp 1 according to the embodiment.

  The lighting device 2 shown in FIG. 9 is a device that is used by being mounted on an indoor ceiling, for example, and includes the light bulb shaped lamp 1 and the lighting fixture 3 according to the above embodiment.

  The lighting device 3 is a device that turns off and turns on the light bulb shaped lamp 1, and includes a device main body 4 that is attached to the ceiling and a translucent lamp cover 5 that covers the light bulb shaped lamp 1.

  The instrument body 4 has a socket 4a. The base 30 of the light bulb shaped lamp 1 is screwed into the socket 4a. Electric power is supplied to the light bulb shaped lamp 1 through the socket 4a.

  In addition, as long as it does not deviate from the gist of the present invention, various modifications conceived by those skilled in the art are applied to the present embodiment and the modified examples, or a form constructed by combining the constituent elements in the embodiments and modified examples, It is included within the scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention is useful as a lamp having a light emitting element such as an LED, in particular, a light bulb shaped lamp that replaces a conventional incandescent light bulb or the like, and can be widely used as a light source of equipment in a lighting device or the like.

DESCRIPTION OF SYMBOLS 1 Light bulb-shaped lamp 10 Globe 11 Opening part 20, 20a, 20b, 20c, 20d LED module 21 Base body 21a Recessed part 21b Housing part 21c Groove part 22 LED (light emitting element)
DESCRIPTION OF SYMBOLS 23 Sealing member 24 Wavelength conversion part 30 Base 40 Support | pillar 41 Main axis part 42 Fixing part 50 Support plate 60 Resin case 61 1st case part 62 2nd case part 70 Lead wire 80 Lighting circuit

In order to achieve the above object, a light-emitting device according to one embodiment of the present invention includes a light-transmitting base, a light-emitting element disposed on a main surface of the base, and a sealing member that seals the light-emitting element. And a sealing member including a first wavelength conversion material that converts a wavelength of light emitted from the light emitting element, and a back surface that is a surface opposite to the main surface of the base, facing the sealing member. A wavelength conversion unit provided at a position to include a wavelength conversion unit including a second wavelength conversion material that converts a wavelength of light emitted from the light emitting element and transmitted through the substrate, of the wavelength conversion unit, length in the width direction perpendicular to the thickness direction of the substrate, wherein the width direction of the sealing member rather long than the length, thickness, thinner than the thickness of the sealing member, and, opposite to the base body The side surface is formed in a flat shape .

Further, in the light emitting device according to one aspect of the present invention, the size of the wavelength conversion unit in a plane perpendicular to the thickness direction of the base body is determined when the base member is seen through from the direction of the main surface. It is good also as a magnitude | size containing.
In addition, the size of the wavelength conversion unit in a plane orthogonal to the thickness direction may be larger than that of the sealing member when the base is seen through from the direction of the main surface.

Further, in the light emitting device according to one aspect of the present invention, a plurality of light emitting elements including the light emitting elements are arranged in at least one row on the main surface of the base body, and the sealing member includes: According to the arrangement of the plurality of light emitting elements, at least one column is formed, and the wavelength conversion unit forms at least one column according to the arrangement of the sealing member. It may be provided.

The type of the base 30 is not particularly limited, but in the present embodiment, a screwed type Edison type (E type) base is used. Examples of the E-type base adopted for the base 30 include an E26 type, an E17 type, and an E16 type.

In this case, the width direction is the direction orthogonal to the thickness of the base 21 direction (Z axis direction), and is defined as the direction (Y axis direction) perpendicular to the array direction (X-axis direction) of the LED22 The

Further, in the LED modules 20c and 20d, a plurality of LEDs 22 may be arranged in the X-axis direction (direction perpendicular to the paper surface of FIGS. 7 and 8 ), similarly to the LED module 20 according to the embodiment. In addition, the LED modules 20c and 20d may include only one LED 22 as a light emitting element, similarly to the LED module 20a according to the first modification.

Claims (8)

A substrate having translucency;
A light emitting device disposed on the main surface of the substrate;
A sealing member that seals the light emitting element, and includes a first wavelength conversion material that converts a wavelength of light emitted from the light emitting element; and
A wavelength conversion unit provided at a position facing the sealing member on the back surface opposite to the main surface of the substrate, the wavelength of light emitted from the light emitting element and transmitted through the substrate A wavelength conversion unit including a second wavelength conversion material for converting
The length of the wavelength conversion part in the width direction orthogonal to the thickness direction of the base is longer than the length of the sealing member in the width direction. The light emitting device according to claim 1, wherein a size of the wavelength conversion unit in a plane orthogonal to a thickness direction of the base body includes the sealing member when the base body is seen through from the direction of the main surface. . A plurality of light emitting elements including the light emitting elements are arranged in at least one row on the main surface of the base body,
The sealing member is provided so as to form at least one row according to the arrangement of the plurality of light emitting elements,
The light emitting device according to claim 1, wherein the wavelength conversion unit is provided so as to form at least one row according to the arrangement of the sealing member. The said base | substrate has the accommodating part which forms the space which accommodates at least one part of the said sealing member, and the said light emitting element is arrange | positioned at the bottom face of the said accommodating part which is the said main surface. The light emitting device according to any one of the above. When the length in the width direction of the sealing member is d1, and the length in the width direction of the wavelength conversion unit is d2, d2 is 1.5 times or more of d1, and d1 The light-emitting device according to claim 1, wherein the light-emitting device is 4 times or less. The sealing member is formed of a wavelength conversion material-containing resin including the first wavelength conversion material,
The light emitting device according to claim 1, wherein the wavelength conversion unit is formed of a glass sintered body including the second wavelength conversion material. The light emitting device according to any one of claims 1 to 6,
Translucent gloves,
A post provided to extend inward of the globe,
The light emitting device is fixed to the support so as to be disposed in the globe. An illumination device comprising the illumination light source according to claim 7.

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