JP2010153044A - Light source unit and luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire for suppressing glare while securing a predetermined light volume of a light source. <P>SOLUTION: A light source unit 3 and the luminaire, for suppressing glare while securing a predetermined light volume of the light source, are provided with a substrate 31 structuring a light-emitting surface, and a light-emitting element 32a mounted on the substrate 31 and arranged at a center part of the light-emitting surface as well as a plurality of light-emitting elements 32b arranged at a peripheral part of the light-emitting element 32a and with relatively low luminance to the light-emitting element 32a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light source unit that uses a light emitting element such as an LED as a light source, and a lighting fixture.

In recent years, lighting fixtures have been developed in which a plurality of light emitting elements such as LEDs are arranged on a substrate as a light source so as to obtain a predetermined amount of light. Conventionally, there has been proposed a fluorescent lamp type lighting fixture in which a fluorescent lamp type LED lamp is configured by attaching an illumination board on which a plurality of LEDs are arranged on a base, and this fluorescent lamp type LED lamp is mounted (Patent Document 1). reference). Furthermore, a fluorescent lamp compatible type LED fluorescent lamp in which a large number of high-brightness LEDs are arranged on a substrate has been proposed (see Patent Document 2).
JP 2007-122933 A JP 2008-130535 A

  However, in these conventional devices, when the amount of light from the light source is further increased, a method of increasing the number of LED elements or increasing the value of the current flowing through the LED elements is employed. In the latter case, there is a problem that glare tends to occur.

  This invention is made | formed in view of the said subject, and it aims at providing the light source unit and lighting fixture which can suppress a glare, ensuring the predetermined light quantity of a light source.

  The light source unit according to claim 1 includes a substrate constituting a light emitting surface; a light emitting element mounted on the substrate and disposed in a central portion of the light emitting surface; and a peripheral portion of the light emitting element; A plurality of light emitting elements having relatively low luminance with respect to the light emitting elements.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified. A light emitting element is solid light emitting elements, such as LED and organic EL. The light emitting element is preferably mounted by a chip-on-board method or a surface mounting method, but the mounting method is not particularly limited due to the nature of the present invention. There is no particular limitation on the number of light emitting elements mounted. The central part and the peripheral part are not uniform. This is a relative concept grasped by the arrangement form of the substrate and the light emitting elements. In addition, the brightness level of the light emitting element is nothing but a relative one.

  A light source unit according to a second aspect is the light source unit according to the first aspect, wherein the light emitting element disposed at the center of the light emitting surface and the light emitting elements disposed around the light emitting element are Further, it is arranged so as to be deviated in the optical axis direction. For example, the case where the light emitting element disposed in the center part is displaced or displaced from the light emitting element disposed in the peripheral part by projecting or immersing in the optical axis direction, etc. Say.

  The lighting fixture according to claim 3 is a fixture main body; a light source unit according to claim 1 or 2 incorporated in the fixture main body; and a light shielding for a light emitting element disposed at a central portion of the light emitting surface. And a light shielding means having a corner set to be larger than a light shielding angle with respect to the light emitting element disposed in the peripheral portion. As the light shielding means, a reflector, a light shielding cover, or the like can be applied, but is not particularly limited to this, and any member that sets a light shielding angle may be used.

  According to the first aspect of the present invention, it is possible to secure a predetermined amount of light, and to reduce discomfort and glare.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, it is possible to provide a light source unit in which desired light distribution characteristics can be easily obtained.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, it is possible to reduce glare.

  Hereinafter, a light source unit and a lighting fixture according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a perspective view showing a lighting fixture, FIG. 2 is a bottom view showing the lighting fixture, and FIG. 3 is a cross-sectional view taken along line YY in FIG.

  The figure shows a ceiling-embedded lighting fixture, and the fixture body 1 has a substantially rectangular parallelepiped shape. The instrument main body 1 includes a rectangular parallelepiped housing 2 having an open surface, a light source unit 3, a heat radiating member 4, a lighting circuit 5 and a reflector 6 as a light shielding unit housed in the housing 2, and a housing 2. And a translucent cover 7 covering the opening. The casing 2 is made of sheet metal, and a flange 21 that is locked to the embedding hole of the ceiling C is formed at the opening edge. The translucent cover 7 may be white, translucent, or diffusive.

  The light source unit 3 includes a substrate 31 and LEDs 32 as a plurality of light emitting elements mounted on the substrate 31. The substrate 31 is made of a substantially rectangular flat plate of glass epoxy resin, which is an insulating material, and a wiring pattern made of copper foil is applied to the surface side. Further, a resist layer is appropriately applied. In addition, when the material of the substrate 31 is an insulating material, a ceramic material or a synthetic resin material having relatively good heat dissipation characteristics and excellent durability can be applied. Moreover, when using metal, it is preferable to apply a material having good thermal conductivity such as aluminum and excellent heat dissipation.

  The LED 32 is a surface-mount type LED package, which is schematically a LED chip disposed in a main body formed of ceramics, and a mold transparent material such as an epoxy resin or a silicone resin that seals the LED chip. It consists of a light-sensitive resin. The LED may be directly mounted on the substrate 31 by a chip-on-board method, and the mounting method is not particularly limited. Here, the LEDs 32 are formed in a plurality of rows, specifically, 3 rows of blocks along the longitudinal direction of the substrate 31, and 3 rows × 10 pieces = 30 pieces are mounted. The high-intensity type LEDs 32a are arranged in the central row, and the LEDs 32b having lower luminance than the high-luminance type LEDs 32a are arranged in the columns on both sides thereof, that is, in the peripheral portion. The surface side of is configured as a light emitting surface. The number of LEDs 32 mounted is not particularly limited, and the brightness levels of the LEDs 32a and 32b are nothing but relative. Furthermore, the board | substrate 31 may be divided | segmented into 3 sheets for every block of each LED32, ie, each row | line | column, for example, In this case, one light emission surface is formed with the divided | segmented 3 board | substrates. .

  A heat radiating member 4 is disposed on the back side of the substrate 31 so as to be in close contact with the substrate 31. The heat dissipating member 4 is made of a metal having heat conductivity such as aluminum die casting, for example, and the heat dissipating surface area is increased on the surface opposite to the joint surface to which the substrate 31 is attached. Is formed. Further, the heat radiating fins 41 on both sides of the heat radiating member 4 extend in the thickness direction of the housing 2 and come into contact with the inner wall of the housing 2.

  Further, a lighting circuit 5 is provided on the back side of the heat radiating member 4. The lighting circuit 5 controls lighting of the LED 32, and components such as a capacitor and a transistor as a switching element are mounted on the circuit board. Further, a lead wire (not shown) is led out from the lighting circuit 5 and is electrically connected to the substrate 31 on which the LED 32 is mounted and a commercial power source.

  Next, a reflector 6 having a parabolic cross section is provided along the longitudinal direction for each LED 32 block. The reflector 6 has a function of efficiently controlling the light distribution of the light emitted from the LED 32, and also has a function as a light shielding unit. The reflector 6a corresponding to the high-luminance type LED 32a is formed so that the light shielding angle θ1 is large, and the reflector 6b corresponding to the LED 32b is formed so that the light shielding angle θ2 is small. That is, the light shielding angle between the reflectors 6a and 6b is set to satisfy the relationship θ1> θ2.

  The operation of the lighting fixture configured as described above will be described. First, when the lighting circuit 5 is energized from a commercial power source, the lighting circuit 5 operates to supply power to the substrate 31, and the LED 32 emits light. The light emitted from the LED 32 is mainly emitted from the opening of the housing 2 through the translucent cover 7 and directly radiated to the outside, and a part of the light is reflected by the reflecting surface of the reflector 6 to be translucent. The light passes through the cover 7 and is radiated to the outside.

  In this case, since the high-intensity type LEDs 32a are arranged in the central column, it is possible to secure a predetermined light amount on the light emitting surface without increasing the number of LEDs. In addition, since the high-brightness type LED 32a is disposed in the central portion and the LED 32b having relatively low luminance is disposed in the peripheral portion, the luminance decreases from the central portion to the peripheral portion. Can be reduced. If a high-brightness LED is arranged in the surrounding area, the central part is relatively dark, and the difference between the high-brightness LED and its background brightness, for example, the ceiling surface brightness, etc. Becomes large, and it is easy to be visually uncomfortable. Further, since the light shielding angle θ1 of the reflector 6a corresponding to the high brightness type LED 32a is set larger than the light shielding angle θ2 of the reflector 6b corresponding to the LED 32b, glare due to light from the high brightness LED 32a is reduced. be able to.

  On the other hand, the heat generated from the LED 32 is mainly transmitted from substantially the entire back surface of the substrate 31 to the heat radiating member 4 and is radiated through the heat radiating fins 41, and further from the heat radiating fins 41 on both sides of the heat radiating member 4 to the housing 2. Conducted and dissipated heat can suppress the temperature rise of the substrate 31.

  As described above, according to the present embodiment, the high-brightness type LED 32a is disposed in the central portion, and the relatively low-luminance LED 32b is disposed in the peripheral portion thereof. Can reduce discomfort and glare. Furthermore, since the light shielding angle θ1 of the reflector 6a corresponding to the high-intensity LED 32a is set larger than the light shielding angle θ2 of the reflector 6b corresponding to the LED 32b, glare can be effectively reduced.

  Next, a light source unit and a lighting fixture according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a bottom view showing the lighting apparatus (Example 1), FIG. 5 is a bottom view (Example 2), and FIG. 6 is a bottom view (Example 3). This embodiment shows a different arrangement form of LEDs as light emitting elements. In each figure, a reflector as a light shielding unit is not shown, and the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  (Embodiment 1) As shown in FIG. 4, the luminaire has a substantially rectangular light emitting surface, and a high-intensity type LED 32a is arranged in the center, and the area around the block of the LEDs 32a in the center. LED 32b having a relatively low luminance is disposed around the periphery so as to surround the LED.

  (Embodiment 2) As shown in FIG. 5, the luminaire has a substantially square light emitting surface, high-intensity type LEDs 32a are arranged in a matrix at the center, and the LEDs 32a at the center are arranged. LEDs 32b having relatively low luminance are arranged in a matrix around the periphery of the block.

  (Embodiment 3) As shown in FIG. 6, the lighting fixture has a substantially circular light emitting surface, and a high-intensity type LED 32a is arranged in the central portion, and the periphery of the block of the LED 32a in the central portion. A block of LED 32b having a relatively low luminance is arranged in the part. For example, this LED block may be configured in triplicate, and the LEDs may be arranged so that the luminance decreases from the central block to the second block and the third block.

  As described above, according to the configuration of the present embodiment, the same effects as those of the first embodiment can be obtained.

  Next, a light source unit and a lighting fixture according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view showing the lighting apparatus (corresponding to FIG. 3 in the first embodiment). In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

  In the present embodiment, the LED 32a disposed at the center of the light emitting surface and the LED 32b disposed around the LED 32a are deviated in the optical axis direction, that is, shifted in the vertical direction in the drawing. It is what is arranged. Therefore, the high-luminance type LED 32a is disposed so as to be immersed in a direction away from the opening of the housing 2 with respect to the LED 32b having relatively low luminance.

  A support member 8 that supports the substrate 31 is attached in the housing 2. The support member 8 has a frame shape in which a concave portion 81 is formed at the center and an opening 83 through which the light emitting surface of the substrate 31 is exposed is formed. The substrate 31 is divided into three parts, and a high-brightness type LED 32a is mounted on the substrate 31a disposed in the central portion corresponding to the recess 81, and relative to the substrate 31b disposed on both sides. The LED 32b having a low luminance is mounted. Moreover, the heat radiating member 4 is arrange | positioned along the shape of the support member 8 in the back surface side of the board | substrates 31a and 31b. Further, the heat radiating member 4 is thermally coupled so that the circuit board of the lighting circuit 5 is in close contact therewith.

  In such a configuration, the light shielding angle θ 1 corresponding to the high-luminance type LED 32 a is controlled by the concave portion 81 of the support member 8 and is set large. On the other hand, the light shielding angle θ2 corresponding to the LED 32b is controlled by the opening edge of the housing 2 and set to be small. That is, the light shielding angle θ1 corresponding to the LED 32a and the light shielding angle θ2 corresponding to the LED 32b are set so as to satisfy the relationship θ1> θ2. Therefore, in this case, the concave portion 81 of the support member 8 and the opening edge of the housing 2 function as a light shielding means, and glare can be effectively reduced.

  As described above, according to the present embodiment, in addition to the effects of the first embodiment, the high-brightness type LED 32a is biased in the optical axis direction so as to be immersed in the direction away from the opening of the housing 2. Therefore, it can be set as the structure which can set a light-shielding angle large easily.

  In contrast to the above-described embodiment, the high-brightness type LED 32a may be disposed so as to protrude in the direction approaching the opening of the housing 2 by being biased in the optical axis direction. Specifically, a convex portion is formed on the support member 8 instead of the concave portion 81, and a substrate on which a high luminance type LED is mounted is disposed corresponding to the convex portion. Therefore, in this case, a lighting fixture with enhanced brightness can be obtained.

  Therefore, a high-luminance type LED disposed in the center of the light-emitting surface and a relatively low-luminance LED disposed in the peripheral portion are arranged in a biased manner in the optical axis direction to achieve a desired arrangement. It is possible to provide a lighting apparatus that easily obtains light characteristics.

  Next, a light source unit and a lighting fixture according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view showing the lighting apparatus (corresponding to FIG. 3 in the first embodiment). In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent part, and the overlapping description is abbreviate | omitted.

  In the present embodiment, as in the third embodiment, the LED 32a disposed in the central portion of the light emitting surface and the LED 32b disposed in the peripheral portion of the LED 32a are arranged offset in the optical axis direction. However, the substrate 31 is formed in a dome shape. Further, a heat radiating member 4 is disposed along the shape of the substrate 31 on the rear surface side of the dome-shaped substrate 31. The substrate 31 may be divided into a plurality of parts.

  Even in such a configuration, the light shielding angle θ1 corresponding to the high-intensity type LED 32a is controlled and set large by the opening edge of the housing 2, while the light shielding angle θ2 corresponding to the LED 32b is similarly set to the housing 2. It is set small by being controlled by the opening edge. Accordingly, the opening edge of the housing 2 substantially functions as a light shielding means, and thereby glare can be reduced.

It is a perspective view which shows the lighting fixture which concerns on the 1st Embodiment of this invention. It is the bottom view. FIG. It is a bottom view which shows the lighting fixture which concerns on the 2nd Embodiment of this invention (Example 1). (Example 2) which is the same bottom view. It is the bottom view (Example 3). It is sectional drawing which shows the lighting fixture which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows the lighting fixture which concerns on the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lighting fixture main body, 3 ... Light source unit, 6 ... Light-shielding means (reflector),
31 ... substrate, 32 ... light emitting element (LED)

Claims (3)

A substrate constituting a light emitting surface;
A light emitting element mounted on the substrate and disposed in the central portion of the light emitting surface, and a plurality of light emitting elements disposed around the light emitting element and having a relatively low luminance with respect to the light emitting element;
A light source unit comprising:   2. The light emitting element disposed in the central portion of the light emitting surface and the light emitting elements disposed in a peripheral portion of the light emitting element are disposed offset in the optical axis direction. The light source unit according to 1. An instrument body;
The light source unit according to claim 1 or 2 incorporated in the instrument body;
Light shielding means set so that a light shielding angle with respect to the light emitting element disposed in the central portion of the light emitting surface is larger than a light shielding angle with respect to the light emitting elements disposed in the peripheral portion;
The lighting fixture characterized by comprising.

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