JP2008084990A - Light-emitting apparatus and illumination appliance - 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: Since a mounting surface 11a of a mounting portion 11 is inclined to the bottom surface, optical axes L of LED chips 10 are not parallel to each other, but cross to each other in a substantial center of a thickness direction of a cover 14. With this configuration, color irregularity is suppressed by enhancing a range where lights to be emitted from each of the LED chips 10, compared to a conventional case where a plurality of LED chips are arranged and mounted on a planar mounting substrate. Further, since a light illumination range is small as a whole, a dispersion portion 16 for dispersing lights to be emitted from the LED chips 10 is provided on only the apex of the cover 14, and the small dispersion portion 16 is required because a dispersion portion 16a is not mixed into the entire of the cover 14, and thus, a manufacturing cost can be reduced. <P>COPYRIGHT: (C)2008,JPO&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 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, a diffusion member such as a glass bead must be uniformly disposed in the sealing portion for sealing the LED chip as in the above-described conventional example, and a large amount of the diffusion member is required. There was a problem of becoming higher.

  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 solid light emitting elements that emit light having different wavelengths, a mounting portion on which the plurality of solid light emitting elements are mounted, and a light-transmitting material. A sealing part formed by sealing the light emitting element; and a diffusion part provided in the sealing part for diffusing light emitted from the solid light emitting element. The mounting part has an optical axis of the plurality of solid light emitting elements. At least one solid state light emitting device is mounted to be inclined with respect to another solid state light emitting device so as to cross each other.

  According to a second aspect of the present invention, in the first aspect of the present invention, the light emitting device includes a condensing unit that condenses the light emitted from the plurality of solid state light emitting elements on the diffusing unit.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the sealing portion is integrally provided with a light distribution portion that distributes the light diffused by the diffusion portion.

  In order to achieve the above object, a fourth aspect of the invention includes the light-emitting device according to any one of the first to third aspects and an instrument body that supports one or more light-emitting devices. .

  According to the first and fourth aspects of the present invention, at least one solid light emitting element is mounted on the mounting portion so as to be inclined with respect to the other solid light emitting elements so that the optical axes of the plurality of solid light emitting elements intersect each other. Therefore, compared to the case where a plurality of solid state light emitting elements are mounted side by side on a flat mounting board as in the conventional example, the range of color mixing of light emitted by each solid state light emitting element is widened and color unevenness can be suppressed. In addition, since the light irradiation range as a whole is narrowed, the diffusion portion can be made small, so that the manufacturing cost can be reduced.

  According to the second aspect of the present invention, since the light is condensed on the diffusing portion by the condensing portion, it is possible to efficiently mix colors, and the diffusing portion can be miniaturized and the light distribution control becomes easy.

  According to the invention of claim 3, since the mixed light is distributed by the light distribution section, it is not necessary to provide a separate light distribution member, and the size of the lighting fixture using the light emitting device can be reduced.

  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.

  FIG. 1A is a partially broken perspective view of the light emitting device of the present embodiment, and FIG.

  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 unit 11 on which these three LED chips 10 are mounted, and a mounting unit 11. A base 12 that is placed and fixed, and a sealing portion 13 that seals each LED chip 10 and a bonding wire (not shown) connected to each LED chip 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 respectively emit three types of light of blue, red, and green.

  The mounting portion 11 has a shape of a rotating body formed by rotating the right triangle around a center line passing through a position away from the acute vertex of the right triangle, and the bottom surface placed on the base 12 is flat. The mounting surface 11a on which the LED chip 10 is mounted is inclined with respect to the bottom surface. The three LED chips 10 are mounted on the mounting surface 11a of the mounting part 11 at equal intervals, and an anode electrode and a cathode electrode are not shown on the conductive pattern (not shown) formed on the mounting surface 11a. Connected with wires.

  The sealing portion 13 is formed by filling a transparent resin material inside a dome-shaped cover 14 fixed to the base 12 so as to accommodate the LED chip 10 and the mounting portion 11 inside. The cover 14 is formed in a dome shape by a molded product of a transparent material such as silicone resin, and the periphery of the opening is bonded to the base 12 so as to accommodate the mounting portion 11 inside. The sealing portion 13 is formed by filling the cover 14 with a transparent resin material 15 such as silicone resin or acrylic resin.

  Further, a diffusing member 16a such as glass beads is mixed in the zenith portion of the cover 14 (a circular portion around the point where the optical axes L of the three LED chips 10 intersect), and the diffusing member 16a is mixed. The zenith portion is a diffusion portion 16 that diffuses light emitted from the LED chip 10. However, as shown in FIG. 1C, the diffusing portion 16 may be provided by forming irregularities having a substantially triangular cross-section on the outer surface of the zenith portion of the cover 14 instead of mixing the diffusing member 16 a. The transparent material used as the material of the cover 14 is not limited to the silicone resin, and for example, an acrylic resin, an epoxy resin, glass, or the like may be employed.

  Thus, as shown in FIGS. 1A and 1B, the optical axis L of each LED chip 10 is not parallel because the mounting surface 11a of the mounting part 11 is inclined with respect to the bottom surface. The covers 14 cross each other at substantially the center in the thickness direction. As described above, the optical axes L of the three LED chips 10 mounted on the mounting surface 11a of the mounting portion 11 intersect each other at the position of the diffusion portion 16 provided at the zenith portion of the cover 14, so Compared with the case where a plurality of LED chips are mounted side by side on a solid mounting board, the range in which the colors emitted by the LED chips 10 are mixed is widened, and color unevenness can be suppressed. In addition, since the light irradiation range as a whole is narrowed, a diffusion portion 16 for diffusing the light emitted from the LED chip 10 may be provided only at the zenith portion of the cover 14, and the entire cover 14 as in the conventional example. Since it is not necessary to mix the diffusing member 16a, the diffusing portion 16 can be made small, so that the manufacturing cost can be reduced.

  Here, as shown in FIG. 2A, three condensing units 17 that condense light emitted from the three LED chips 10 onto the diffusing unit 16 may be provided in the sealing unit 13. These three condensing parts 17 protrude from the inner side of the zenith portion of the cover 14 and are formed of a convex lens whose incident surface facing the LED chip 10 is formed in a convex curved surface, and each diffuses light emitted from the LED chip 10. Condensed on the part 16. Thus, by providing the condensing part 17, there exists an advantage that while being able to mix colors efficiently, the spreading | diffusion part 16 can be reduced in size and light distribution control becomes easy.

  Furthermore, as shown in FIG. 2B, a light distribution unit 18 that distributes the light diffused by the diffusion unit 16 may be provided integrally with the sealing unit 13. The light distribution unit 18 in the illustrated example is formed of a convex lens that protrudes outside the zenith portion (diffusion unit 16) of the cover 14 and has a tip surface formed into a convex curved surface. If the light (white light) mixed through the diffusing unit 16 is distributed by the light distributing unit 18 in this way, it is not necessary to provide a separate light distribution member, and it is possible to reduce the size of a lighting fixture using a light emitting device. There are advantages.

  Note that the shape of the mounting portion 11 is not limited to that of the present embodiment, and any shape is possible as long as mounting is possible so that the optical axes L of the plurality of LED chips 10 intersect each other. I do not care. Further, the number of LED chips 10 mounted on the mounting unit 11 and the type of emission color are not limited to three, and two or four or more LED chips 10 may be mounted on the mounting unit 11. The LED chip 10 that emits orange or yellow light in addition to blue, red, and green may be mounted.

  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 an embodiment of a light emitting device according to the present invention, where (a) is a partially broken perspective view, (b) is a cross-sectional view, and (c) is a partial cross-sectional view showing another structure of a diffusion portion. (A) is sectional drawing same as the above at the time of providing a condensing part, (b) is sectional drawing same as the above at the time of providing a condensing part and a light distribution part. 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 11a Mounting surface 13 Sealing part 14 Cover 16 Diffusion part

Claims (4)

A plurality of solid-state light-emitting elements that emit light having different wavelengths, a mounting portion on which the plurality of solid-state light-emitting elements are mounted, a sealing portion formed by sealing the solid-state light-emitting elements with a translucent material, and a sealing A diffusion unit that is provided in the unit and diffuses light emitted from the solid state light emitting device,
The mounting unit is mounted with at least one solid-state light-emitting element tilted with respect to another solid-state light-emitting element so that the optical axes of the plurality of solid-state light-emitting elements intersect each other.   The light-emitting device according to claim 1, further comprising a condensing unit that condenses light emitted from the plurality of solid-state light-emitting elements on the diffusion unit.   The light-emitting device according to claim 1, wherein the sealing unit is integrally provided with a light distribution unit that distributes light diffused by the diffusion unit.   An illumination fixture comprising: the light-emitting device according to any one of claims 1 to 3; and a fixture main body that supports one or more light-emitting devices.

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