JP2011129381A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system in which non-light-emitting regions of the adjoining substrates are made so as not to be conspicuous, and the adverse effects on an irradiation surface can be reduced. <P>SOLUTION: The lighting system 1 is provided with a plurality of substrates 4, on which a plurality of light-emitting elements 6 are mounted and which have a non-light-emitting region A where the light-emitting elements 6 are not mounted at the end edge portion, and an installation means 1 in which the plurality of substrates 4 are installed, in a row and the non-light-emitting regions A of the adjoining substrates 4 are arranged so as to overlap in the front and the rear. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lighting device using a light emitting element such as an LED.

  In stage lighting and TV studio lighting, floodlights are used as base lighting to illuminate people, specific tools and props. A floodlight uses a halogen bulb or a fluorescent lamp as a light source, and irradiates a relatively wide range with uniform illuminance.

  By the way, recently, an illumination device has been developed in which a plurality of light emitting elements such as LEDs are arranged on a substrate as a light source for illumination so as to obtain a predetermined amount of light (see, for example, Patent Document 1). Patent Document 1 discloses a form in which a plurality of substrates on which light emitting elements are mounted are arranged side by side.

Japanese Patent Laying-Open No. 2008-227212 (FIGS. 8 and 9)

  However, the substrate is provided with a frame member for filling the inside with a wiring member for electrically connecting a plurality of light emitting elements and a sealing member such as silicone resin. Further, in order to secure an insulation distance, the wiring pattern needs to be formed at a predetermined distance from the edge portion of the substrate. Although not limited to these, a non-light emitting region where a light emitting element is not mounted is formed at the edge of the substrate for various reasons.

  In this case, when a plurality of substrates are arranged side by side, the non-light-emitting area between adjacent substrates is projected by the irradiated object when the light-emitting element is turned on and the non-light-emitting area is conspicuous in appearance or applied to a floodlight. The inconvenience that the image to be displayed appears multiple times occurs.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an illuminating device that can reduce the inconspicuousness of the non-light-emitting area between adjacent substrates or reduce adverse effects on the irradiated surface. To do.

  The lighting device according to claim 1, wherein a plurality of light emitting elements are mounted, and a plurality of substrates having a non-light emitting region in which the light emitting elements are not mounted on the edge portion; And a non-light-emitting area of the substrate that is disposed so that the non-light-emitting areas overlap each other.

  In the present invention and the following inventions, the technical meaning and interpretation of terms are as follows unless otherwise specified. For the substrate, it is preferable to apply a metal material having good thermal conductivity and excellent heat dissipation, such as aluminum, as the base plate, but the special constituent material is not limited. When the base plate is made of an insulating material, a ceramic material or a synthetic resin material having relatively good heat dissipation characteristics and excellent durability can be used.

  A light emitting element is a solid light emitting element such as an LED. Moreover, there is no restriction | limiting in particular in the mounting number of a light emitting element. The mounting method of the light emitting element on the light emitting element substrate can be a chip-on-board method or a surface mounting method, and the mounting method is not particularly limited.

The attached means means a member to which the substrate is attached, but is preferably a heat radiating member. In this case, what is called a heat sink, a main body of the apparatus, a case or a cover is included. That is, the heat radiating member means a member having thermal conductivity that is thermally coupled to the substrate.
Illumination devices include light sources, luminaires, and display devices used indoors or outdoors.

  The illumination device according to claim 2 is the illumination device according to claim 1, wherein the attached means is a heat dissipating member thermally coupled to the substrate. With this configuration, the temperature rise of the light emitting element can be suppressed, and various characteristics such as life and efficiency can be improved.

According to the first aspect of the present invention, it is possible to provide an illuminating device capable of making the non-light-emitting region between adjacent substrates inconspicuous.
According to invention of Claim 2, in addition to the effect of invention of Claim 1, the illuminating device which can suppress the temperature rise of a light emitting element can be provided.

It is a perspective view which shows the floodlight as an illuminating device which concerns on the 1st Embodiment of this invention. It is a top view which shows the light source part. It is a side view which shows the light source part. It is a perspective view which shows the board | substrate with which the light emitting element was mounted. It is the top view which showed typically the relationship between the light source part, the irradiated object, and a projection wall surface. It is a top view which shows the light source part of a comparative example. It is a side view which shows the light source part. FIG. 6 is a plan view schematically showing a relationship among a light source unit, an irradiated object, and a projection wall surface in a comparative example, similarly to FIG. 5. It is a side view which shows the principal part of the light source part in the illuminating device which concerns on the 2nd Embodiment of this invention. It is a side view which shows the principal part of the light source part in the illuminating device which concerns on the 3rd Embodiment of this invention.

  Hereinafter, a lighting device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. In addition, the same code | symbol is attached | subjected to the same part in each figure, and the overlapping description is abbreviate | omitted. Also, illustration of wiring members such as lead wires is omitted.

  In FIG. 1, a floodlight 1 is shown as an illumination device. The floodlight 1 includes a box-shaped case main body 2 having an open front side, a light source unit 3 accommodated in the case main body 2, and a lighting device (not shown) connected to the light source unit 3.

  The case body 2 includes an opening on the front side as an irradiation opening 21, and includes a bander 22 attached to four sides of the irradiation opening 21 and a support arm 23 bent in a U shape. The band 22 is rotatable and has a function of blocking the light leaking in an unnecessary direction by adjusting the opening / closing of the irradiation opening 21. The support arm 23 supports the case body 2 so as to be rotatable, and can change the irradiation direction of the light by changing the elevation angle of the irradiation opening 21.

  The light source unit 3 is a plurality of substrates 4 and attached means attached so that these substrates 4 are arranged side by side, and includes a heat sink 5 that is a heat radiating member. As shown in FIGS. 2 and 3, specifically, the three substrates 4 are arranged in the horizontal direction and attached to the substrate attachment surface 51 of the heat sink 5.

  As representatively shown in FIG. 4, a plurality of light emitting elements 6 are disposed on the substrate 4 so as to form a substantially circular shape. In order to improve the heat dissipation of each light emitting element 6, it is preferable to apply a metal material having good heat conductivity such as aluminum and excellent heat dissipation to the substrate 4 as the base plate. As such a substrate 4, a metal base substrate in which an insulating layer is laminated on one surface of an aluminum base plate is used. When the base plate is made of an insulating material, a ceramic material or a synthetic resin material such as an epoxy resin, which has relatively good heat dissipation characteristics and excellent durability, can be used.

  On the insulating layer of the substrate 4, a wiring pattern for electrically connecting the light emitting elements 6 is formed. The wiring pattern has a three-layer structure, and a copper pattern is provided by etching as a first layer on the surface of the insulating layer. On this copper pattern layer, nickel (Ni) is plated as a second layer, and silver (Ag) is plated on the third layer.

The plurality of light emitting elements 6 are LED bare chips. For example, an LED bare chip that emits blue light in order to cause white light to be emitted from the light emitting unit is used. The bare chip of the LED is arranged and bonded in a substantially circular shape using a silicone resin adhesive on the surface of the substrate 4 on which the wiring pattern is formed. The frame member 41 is formed of a glass epoxy resin in a substantially square shape and is bonded onto the substrate 4.

The sealing member 42 is made of a translucent synthetic resin, for example, a transparent silicone resin, and is provided on the substrate 4 so as to be filled inside the frame member 41. The sealing member 42 seals each light emitting element 6 and a bonding wire connecting each light emitting element 6.

  The sealing member 42 contains an appropriate amount of phosphor. The phosphor is excited by light emitted from the light emitting element 6 and emits light of a color different from the color of light emitted from the light emitting element 6. In the present embodiment in which the light-emitting element 6 emits blue light, a yellow phosphor that emits yellow light having a complementary color relationship with blue light is used as the phosphor so that white light can be emitted. Has been. The sealing member 42 is provided by being heat-cured after being injected into the frame member 41 in a predetermined amount in an uncured state. Therefore, the sealing area of the sealing member 42 is defined by the frame member 41.

Note that conductive terminals 43 connected to the wiring pattern are provided on both ends of the substrate 4. The conductive terminal 43 is connected to a lighting device by a lead wire or the like, and power is supplied from the lighting device to each light emitting element 6 so that each light emitting element 6 is controlled to be turned on.
Here, a non-light emitting region A in which the light emitting element 6 is not mounted is formed at the edge portion of the substrate 4 because the frame member 41 is provided and a wiring pattern is formed.

  As shown in FIGS. 2 and 3, the heat sink 5 as the attached means is made of, for example, a metal material such as aluminum having good thermal conductivity, has a board mounting surface 51, and a plurality of heat radiation fins on the back side. 52 is provided. The board mounting surface 51 is substantially flat and includes a front surface mounting surface 53 and a back surface mounting surface 54. The front side mounting surface 53 is provided on both sides of the back side mounting surface 54. The back side attachment surface 54 is formed in a trapezoidal concave portion 54a on its side surface, and its side wall is widened toward the back side. Accordingly, recesses H are formed on both sides of the recess 54a (see FIG. 3).

  Three substrates 4 are mounted side by side on the substrate mounting surface 51, and the two substrates 4 are mounted on the front surface mounting surface 53 by fixing means such as screws, respectively. A single substrate 4 is attached to the surface 54 by bonding or the like. The non-light emitting area A of the substrate 4 on the back side mounting surface 54 is arranged so as to enter the recess H.

In this attachment state, the non-light-emitting area A of the substrate 4 attached to the central back-side attachment surface 54 cannot be visually confirmed. That is, the non-light-emitting area A of the substrate 4 attached to the front-side mounting surface 53 becomes the non-light-emitting area A of the substrate 4 attached to the front-side mounting surface 53. A is hidden behind the back side and cannot be seen from the front side. Only the non-light emitting area A of the substrate 4 on the front side mounting surface 53 appears on the front side, and the non-light emitting area A is reduced in projection, and is reduced to about ½.
Next, the operation of the floodlight 1 configured as described above will be described together with the configuration of the comparative example shown in FIGS.

  First, in the comparative example shown in FIGS. 6 and 7, the heat sink 50 has a flat substrate mounting surface 510, and three substrates 4 are arranged and mounted side by side on the substrate mounting surface 510. ing. The substrate mounting surface 510 is not formed with a recess as in the above embodiment, and the substrate 4 is mounted on the substrate mounting surface 510 forming the same surface. Therefore, the non-light emitting area A of each substrate 4 appears on the front side.

  In such a configuration of the comparative example, when power is supplied from the lighting device to the substrate 4, the light emitting elements 6 are turned on all at once, and the light source unit 3 can be used as a planar light source. However, the presence of the non-light emitting area A of each adjacent substrate 4 may cause the non-light emitting area A to be conspicuous in appearance. Moreover, as shown in FIG. 8, the projected image of the object irradiated by the light source unit 3 appears multiple times, and may give an unnatural impression to the viewer.

  FIG. 8 is a plan view schematically showing the relationship between the light source unit 3, the object O, and the projection wall surface W for explanation. Since there is a non-light emitting area A between the substrates 4 of the light source unit 3, the range of the projection image of the object O on the projection wall surface W generated by the light irradiated from the substrate 4 (shown arrow) is widened. Thus, the projection images created by the light irradiated from the respective substrates 4 can be visually recognized individually. Therefore, the projected image appears multiple times, giving an unnatural impression to the viewer.

  In contrast to this comparative example, in the present embodiment, since the non-light emitting area A of the substrate 4 can be reduced in a projection manner, the non-light emitting area A of the light source unit 3 can be made inconspicuous, and light can be emitted with uniform illuminance. Can be irradiated. Further, as shown in FIG. 5, since the non-light emitting area A between the substrates 4 of the light source unit 3 is reduced, the range of the projection image of the object O on the projection wall surface W is narrowed, and each substrate is reduced. The projection image created by the light emitted from 4 is difficult to be seen individually, can suppress the multiple appearance of the projection image, and can give the viewer a natural impression.

  On the other hand, the heat generated when each light emitting element 6 is lit is transmitted to the heat sink 50 that is thermally coupled mainly from the back side of the substrate 4, and is radiated from the radiation fins 52.

  As described above, according to the present embodiment, it is possible to provide the floodlight 1 in which the non-light emitting area A can be made inconspicuous and the projection image can be prevented from appearing in a multiple manner.

  Next, a lighting device according to a second embodiment of the present invention will be described with reference to FIG. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In this embodiment, the recessed part 54a formed in the back side attachment surface 54 is comprised so that the substantially U-shaped hollow H may be formed. Therefore, the non-light emitting area A of the substrate 4 attached to the back side attachment surface 54 is arranged so as to enter the recess H.

  As described above, according to the present embodiment, similarly to the first embodiment, the non-light emitting area A is reduced in projection, the non-light emitting area A can be made inconspicuous, and the projected image is displayed in a multiplexed manner. Can be suppressed.

Subsequently, an illumination apparatus according to a third embodiment of the present invention will be described with reference to FIG. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

In the present embodiment, the relationship between the front side mounting surface and the back side mounting surface in the first embodiment is reversed. Therefore, the rear side mounting surfaces 54 are provided on both sides of the central front side mounting surface 53. The front side mounting surface 53 protrudes toward the front side, and its side wall is widened toward the front side. A recess H is formed between the back side mounting surface 54 and the side wall, and the non-light emitting area A of the substrate 4 of the back side mounting surface 54 enters the recess H.

As described above, according to the present embodiment, the non-light-emitting area A is reduced in projection, the non-light-emitting area A can be made inconspicuous, and the projection image can be prevented from appearing in a multiple manner.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the light source unit is configured as a single unit with a plurality of substrates and a heat sink to which these substrates are attached. However, the apparatus main body may be used as the heat sink. Further, a chip-on-board method or a surface mounting method can be applied as a method for mounting the light emitting element on the substrate, and the mounting method is not particularly limited.

  The lighting device is preferably applied to floodlights used for stage lighting and TV studio lighting, but can be applied to light sources, lighting fixtures, and display devices used indoors or outdoors.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device (flood light), 4 ... Board | substrate, 6 ... Light emitting element,
5: Mounted means (heat dissipating member), 51 ... Board mounting surface,
53: Front mounting surface, 54: Back mounting surface, A: Non-light emitting area

Claims (2)

A plurality of substrates having a non-light emitting region in which a plurality of light emitting elements are mounted and a light emitting element is not mounted on an edge;
A mounted means in which the plurality of substrates are juxtaposed and arranged so that the non-light-emitting regions of adjacent substrates overlap each other;
An illumination device comprising:   The lighting device according to claim 1, wherein the attached means is a heat radiating member that is thermally coupled to the substrate.

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