JP4770676B2 - Light emitting device and lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting apparatus capable of suppressing color irregularity while decreasing a manufacturing cost, and to provide an illumination appliance. <P>SOLUTION: In a sealing portion 12, a dispersing portion 14 is disposed on the outside (non-color mixture region) of a color mixture region where lights (blue, red and green lights) emitted from an LED chip 10 and having different wavelengths are mixed. With this configuration, a range of color mixture is wider than in a case of not providing the dispersion portion 14 and color irregularity can be suppressed. Further, since the dispersion portion 14 is smaller than in a conventional case where a dispersion member is mixed in the entire sealing portion, a manufacturing cost can be reduced. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a light emitting device and a lighting fixture using a solid light emitting element such as a light emitting diode as a light source.

Conventionally, as a light-emitting device that obtains white light, for example, three types of solid-state light emitting elements (LED chips) that emit blue light, red light, and green light, respectively, and a plate-like mounting on which these three types of LED chips are mounted By including a substrate and a sealing part formed by sealing an LED chip together with a diffusing member such as a glass bead by a translucent material, by mixing blue light, red light, and green light diffused by the diffusing member Some irradiate white light to the outside (see Patent Document 1).
JP 2002-280617 A

  By the way, in the structure in which a plurality of solid state light emitting elements (LED chips) are mounted side by side on a flat mounting board as in the conventional example, the light axes of the respective solid state light emitting elements are substantially parallel, so The range of color mixing becomes narrow and color unevenness is likely to occur. Therefore, in the above conventional example, the color mixing range is expanded by uniformly disposing a diffusion member such as a glass bead in the sealing portion for sealing the LED chip, but a large amount of the diffusion member is mixed in the entire sealing portion. Therefore, there is a problem that the manufacturing cost becomes high.

  This invention is made | formed in view of the said situation, The objective is to provide the light-emitting device and lighting fixture which can suppress color unevenness, reducing manufacturing cost.

In order to achieve the above object, a first aspect of the present invention provides a plurality of types of solid light emitting devices that emit light having different wavelengths, and a sealing portion made of a transparent resin material that seals the plurality of types of solid light emitting devices. And a diffusing part that is provided in the sealing part and diffuses the light emitted from the solid light emitting element, and the sealing part is a color mixture of all the light having different wavelengths emitted from the plurality of types of solid light emitting elements. Yes and color mixing region is located outside the mixing area, and a corresponding plurality of types of solids out from the light-emitting element of the lights of different emission wavelengths, either one or more non-color-mixture region light that is incident The diffusion unit is characterized in that the light diffusion member is mixed only in the non-color mixing region.

  In order to achieve the above object, a second aspect of the invention is characterized by comprising the light emitting device of the first aspect and an instrument body that supports one or more light emitting devices.

According to the invention of claim 1 and claim 2, a plurality of types of solid light emitting elements that emit light having different wavelengths, a sealing portion made of a transparent resin material that seals the plurality of types of solid light emitting elements, A diffusing unit that is provided in the sealing unit and diffuses light emitted from the solid state light emitting device, and the sealing unit mixes all of the light beams having different wavelengths emitted from the plurality of types of solid state light emitting devices. and color mixing area, located outside the mixing area, among the plurality of kinds of solid lights of different emission wavelength from the light emitting element, and a any one or more of the non-color-mixture region light that is incident, Since the light diffusing member is mixed only in the non-color-mixing region, the diffusing portion has a wider range of color mixing than when no diffusing portion is provided, and color unevenness can be suppressed. Compared to the case where the diffusion member is mixed in the entire sealing portion, the diffusion portion is The manufacturing cost can be reduced to need Te fence.

  Hereinafter, embodiments of a light emitting device and a lighting fixture according to the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1A shows a cross-sectional view of the light emitting device of this embodiment. The light emitting device of this embodiment includes a plurality of (three in the illustrated example) LED chips 10 that emit light having different wavelengths, a mounting substrate 11 on which these three LED chips 10 are mounted, each LED chip 10, And a sealing portion 12 for sealing bonding wires (not shown) connected to the individual LED chips 10.

  The three LED chips 10 are a GaN-based blue LED chip, a GaAs-based red LED chip, and a GaP-based green LED chip that emit three types of light of blue, red, and green, respectively. The anode electrode and the cathode electrode are each connected to a conductive pattern (not shown) formed on the surface and connected to the conductive pattern (not shown) by bonding wires (not shown).

  The sealing portion 12 is formed by filling a transparent resin material inside a hemispherical cover 13 fixed to the mounting substrate 11 so as to house the LED chip 10 inside. The cover 13 is formed in a hemispherical shape from a molded product of a transparent material such as silicone resin, and the periphery of the opening is bonded to the mounting substrate 11. Then, the sealing portion 12 is formed by filling the cover 13 with a transparent resin material such as silicone resin or acrylic resin.

  Here, all three types of light emitted from each LED chip 10 can be mixed in the zenith portion 13a of the cover 13, but only one or two types of light are mixed in the outer portion of the zenith portion 13a. I can't. Therefore, in this embodiment, light is diffused to the outer portion (hereinafter referred to as “non-color-mixed region”) of the zenith portion 13a (hereinafter referred to as “color-mixed region”) in which all three types of light can be mixed. A diffusion unit 14 is provided. The diffusing portion 14 is formed by mixing a diffusing member 14 a such as glass beads in a non-color-mixing region in the cover 13. However, as shown in FIG. 1B, instead of mixing the diffusing member 14a, the diffusing portion 14 may be provided by forming irregularities having a substantially triangular cross section on the outer surface of the cover 13 in the non-color mixing region.

  As described above, according to the present embodiment, the diffusing unit 14 is disposed outside the color mixture region (non-color mixture region) in which light having different wavelengths (blue light, red light, and green light) emitted from the LED chip 10 is mixed. Therefore, compared with the case where the diffusing portion 14 is not provided, the range of color mixing is widened and color unevenness can be suppressed. In addition, the manufacturing cost can be reduced because the diffusing portion 14 can be made smaller compared to the case where the diffusing member is mixed in the entire sealing portion as in the conventional example. In addition, as shown in FIG. 1C, in the color mixture region, a diffusion structure 13b having unevenness with a substantially triangular cross section may be provided on the outer surface of the cover 13 in order to match the light distribution.

  By the way, in this embodiment, the lens part 30 which controls light distribution of the light radiated | emitted through the sealing part 12 is arrange | positioned facing the sealing part 12. FIG. The lens unit 30 is a Fresnel lens, and has a recess 31 that accommodates the color mixture region of the sealing unit 12. The lens unit 30 reflects light incident from the inner surface 31 a of the recess 31 on the outer surface 30 b. 30 is led to the light emitting surface 30a side. In addition, a plate-like flange 32 is integrally provided around the lens portion 30, and the surface of the flange 32 facing the sealing portion 12 (the lower surface in FIG. 1A) has an approximately triangular uneven shape. A portion 32a is formed. Therefore, since the light diffused by the diffusing portion 14 is diffused in the concavo-convex portion 32a of the flange portion 32, light having different wavelengths can be mixed more uniformly.

(Embodiment 2)
FIG. 2 shows a cross-sectional view of the light emitting device of this embodiment. However, the light emitting device of this embodiment is characterized by the structure of the diffusion part, and the other components are almost the same as those of the first embodiment, so the same components are denoted by the same reference numerals and description thereof is omitted. To do.

  The diffusing portion 15 in the light emitting device of the present embodiment is formed in a substantially cylindrical shape by mixing a diffusing member (not shown) such as glass beads in a transparent resin material such as silicone resin or acrylic resin. Is fixed on the mounting substrate 11 so as to surround the. The diffusing portion 15 has an inner peripheral surface that is inclined so that the thickness in the radial direction (left-right direction in FIG. 2) is gradually reduced as the distance from the mounting substrate 11 decreases. On the other hand, since the diffusing member is uniformly mixed in the transparent resin material, the amount of the diffusing member decreases in the diffusing portion 15 as the distance from the LED chip 10 increases. The height dimension H of the diffusing portion 15 is a dimension in which the radiation ranges S2 and S3 of light radiated from the two LED chips 10 located on the outside intersect the tip of the diffusing portion 15.

  Thus, the region where the light emission ranges S1, S2, and S3 emitted from the three LED chips 10 overlap is a color mixture region, and the outer region emits light emitted from two or one LED chip 10. Since this is a non-color-mixing region that exists only in the ranges S2 and S3, by arranging the diffusion portion 15 in the non-color-mixing region as described above, the color-mixed range becomes wide and color unevenness can be suppressed. Here, in the non-color-mixed area, the ratio of the color mixture increases as the distance from the mounting substrate 11 increases. Therefore, in the present embodiment, the diffusing member 15 is gradually reduced by increasing the radial thickness of the diffusion portion 15 away from the mounting substrate 11. The amount of is decreasing. By adopting such a structure, it is possible to manufacture the diffusing portion 15 more easily than changing the mixing ratio of the diffusing member in the height direction by making the radial thickness of the diffusing portion 15 uniform.

  FIG. 3 is a partially omitted perspective view showing the lighting apparatus of the present embodiment. The lighting fixture is a so-called downlight, and the plurality of light emitting devices 1 described above are attached to the bottom surface 100a of the bottomed cylindrical fixture body 100, and a protective cover (not shown) made of glass or transparent resin material. The opening surface of the instrument body 100 is configured to be closed. However, the lighting fixture according to the present invention is not limited to a downlight.

1 shows Embodiment 1 of a light-emitting device according to the present invention, where (a) is a cross-sectional view, (b) is a partial cross-sectional view showing another structure of a diffusion portion, and (c) is a cross-sectional view showing another structure. It is sectional drawing which shows Embodiment 2 of the light-emitting device based on this invention. It is a perspective view of the principal part which shows embodiment of the lighting fixture which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 LED chip 11 Mounting part 12 Sealing part 13 Cover 14 Diffusion part

Claims (2)

Plural types of solid light emitting elements that emit light having different wavelengths, a sealing portion made of a transparent resin material that seals these plural types of solid light emitting elements, and a solid light emitting element provided in the sealing portion And a diffusing part for diffusing light
The sealing portion is a color mixture region in which all of the light beams having different wavelengths emitted from the plurality of types of solid light emitting elements are mixed, and a wavelength emitted from the plurality of types of solid light emitting devices , located outside the color mixture region. among different light, and a any one or more of the non-color-mixture region light that is incident,
The light diffusing device is characterized in that the light diffusing member is mixed only in the non-color mixing region.   A lighting fixture comprising: the light-emitting device according to claim 1; and a fixture body that supports one or more light-emitting devices.

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