JP2011222149A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system capable of restraining irradiation unevenness by maintaining a desired light distribution state.SOLUTION: The lighting system 1 is provided with a light source part 3 with a light-emitting element 32 as a light source, a reflecting body 5 equipped with an irradiation opening 51 for irradiating light emitted from the light-emitting element 32 toward outside and with a reflecting face 52 formed on an inner face side so as to be expanded toward the irradiation opening 51, and a translucent cover 6 covering the irradiation opening 51 and with a peripheral edge part at least on an inner face side blast-treated.

Description

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

  An acoustic reflector is provided on a stage such as a theater or a hall to effectively convey the tone of a concert or the like to the audience. The acoustic reflector is composed of a ceiling reflector, a front reflector, a side reflector, etc., and is configured to accurately and three-dimensionally reflect the sound, and is stored when not in use. Yes.

  An illuminating device is embedded in the ceiling reflector of the acoustic reflector for illumination of the production space, and a lamp such as a halogen bulb is used as the light source (see, for example, Patent Document 1).

  By the way, in recent years, in order to realize energy saving and long life, this type of lighting device is configured to mount a plurality of light emitting elements such as LEDs on a substrate as a light source for illumination to constitute a light source unit to obtain a predetermined light amount. Has been developed. This illuminating device controls the light distribution of light emitted from the light source unit by a reflector and irradiates outward through a transparent protective cover made of acrylic resin or the like provided on the front side.

Japanese Patent No. 3003185

However, in such an illuminating device, the light emitted from the light source part may be reflected on the inner surface side of the protective cover, which may cause unintended irradiation unevenness on an irradiation surface such as a wall surface.
The present invention has been made based on the above problems, and an object of the present invention is to provide an illumination device that can maintain a desired light distribution state and suppress uneven irradiation.

The illumination device according to claim 1 includes a light source unit having a light emitting element as a light source; and an irradiation opening through which the light emitted from the light emitting element is irradiated outward, and extends toward the irradiation opening. A reflector having a reflection surface formed on the inner surface side so as to open; and a translucent cover that covers the irradiation opening and at least a peripheral edge portion on the inner surface side is blasted. To do.
A light emitting element is a solid light emitting element such as an LED. There is no particular limitation on the number of light emitting elements.

A translucent cover having a peripheral surface blasted at least on the inner surface side is that light emitted from the light emitting element is totally reflected on the inner surface of the cover, and the totally reflected light is further reflected on the reflecting surface of the reflector. It means that a blasting process is performed in order to suppress this total reflection, assuming a phenomenon of being reflected and irradiated outward.
The lighting device is preferably used for lighting in a production space such as stage lighting, but can be applied to lighting equipment and display devices used indoors or outdoors.

  According to the first aspect of the present invention, it is possible to provide an illuminating device capable of suppressing irradiation unevenness and maintaining a desired light distribution state with a simple configuration.

It is a perspective view which shows the ceiling reflector light as an illuminating device which concerns on the 1st Embodiment of this invention. It is the perspective view which looked at the ceiling reflector light from the back side. It is a side view which shows the state in which the ceiling reflector light was installed in the ceiling reflector. It is a schematic exploded view of the ceiling reflector light. It is a perspective view which shows the light source part. It is the sectional side view and top view which show the cover. It is explanatory drawing which shows the light distribution state in a comparative example, and the irradiation state in an irradiation surface. It is the side sectional view and top view showing the cover concerning a 2nd embodiment of the present invention.

  Hereinafter, a lighting device according to a first embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part in each figure, and the overlapping description is abbreviate | omitted.

  1 to 4, a ceiling reflector light 1 is shown as a lighting device. The ceiling reflector light 1 is used for illumination of a production space such as a stage, and is embedded in a ceiling reflector of an acoustic reflector. The ceiling reflector light 1 includes a main body case 2, a light source unit 3 accommodated in the main body case 2, a heat radiating member 4 thermally coupled to the light source unit 3, a reflector 5, and the reflector. 5 is provided with a translucent cover 6 disposed in front of 5 and a lighting device (not shown) connected to the light source unit 3.

  The main body case 2 is formed in a cylindrical shape, and a cylindrical inner frame 21 is disposed on the inner side (see FIG. 4). In the inner frame 21, the light source unit 3, the reflector 5 and the cover 6 are arranged. The inner frame 21 is attached with a bearing member 22 on which a support fitting 9 described later is pivotally supported.

As representatively shown in FIG. 5, the light source unit 3 includes a substrate 31 and a plurality of light emitting elements 32 mounted on the substrate 31. In order to improve the heat dissipation of each light emitting element 32, it is preferable to apply to the substrate 31 a metal material having good heat conductivity such as aluminum and excellent heat dissipation as the base plate. As such a substrate 31, a metal base substrate having an insulating layer laminated on one surface of an aluminum base plate is used. In addition, as a material of the base plate, a synthetic resin material such as a ceramic material or an epoxy resin can be applied when an insulating material is used.
On the insulating layer of the substrate 31, a wiring pattern for electrically connecting the light emitting elements 32 is formed.

  Note that conductive terminals 33 connected to the wiring pattern are provided on both ends of the substrate 31. Ten conductive terminals 33 are provided on both ends, respectively, and connected to the lighting device by lead wires 34. Electric power is supplied from the lighting device to each light emitting element 32, and lighting control of each light emitting element 32 is performed. It is like that.

  On the surface of the substrate 31, a plurality of light emitting elements 32 are disposed so as to form a substantially circular shape. More specifically, 1000 or more light emitting elements 32 are arranged in 10 blocks. For example, four blocks in which seven series of seven light emitting elements 32 are connected in series and 14 columns connected in parallel, four blocks in which 19 series of similar series circuits are connected in parallel, and similar series circuits are connected in parallel. It is composed of two blocks connected in 20 columns.

  The positive electrode side line and the negative electrode side line of each block are connected to the conductive terminal 33. Furthermore, lead wires 34 are connected to the respective conductive terminals 33 on both sides by solder or the like, and in the drawing, ten lead wires 34 on the left and right sides are covered with an insulating coating material 35 and bundled out. The lead wire 34 is disposed and accommodated in the groove portion 42 between the heat radiation fins 41 of the heat radiating member 4 via the cutout portions 71 on both sides of the base plate 7, so that the rear surface side of the heat radiating member 4 (FIG. 2 and FIG. 3 is led out to the upper surface side) and further focused on a focusing box 8 attached to the back side of the heat radiating member 4.

The plurality of light emitting elements 32 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 this LED is arranged and bonded in a substantially circular shape on the surface of the substrate 31 on which the wiring pattern is formed using a silicone resin adhesive. The frame member 36 is formed of a glass epoxy resin in a substantially square shape, and is bonded to the substrate 31.

The sealing member 37 is made of a light-transmitting synthetic resin, for example, a transparent silicone resin, and is provided on the substrate 31 so as to be filled inside the frame member 36. The sealing member 37 seals each light emitting element 32 and a bonding wire connecting each light emitting element 32.

  The sealing member 37 contains an appropriate amount of phosphor. The phosphor is excited by light emitted from the light emitting element 32 and emits light of a color different from the color of light emitted from the light emitting element 32. In the present embodiment in which the light emitting element 32 emits blue light, a yellow phosphor that emits yellow light that is complementary to the blue light is used for the phosphor so that white light can be emitted. Has been.

  The light source unit 3 configured as described above is attached so as to be thermally coupled to the heat radiating member 4 via the base plate 7. The base plate 7 is formed in a circular plate shape by an aluminum material having good heat conduction, and a semicircular cutout portion 71 is formed facing the peripheral edge portion. A substrate 31 is attached to the base plate 7 with attachment screws so that the back side thereof is in close contact.

  As shown in FIG. 4, the base plate 7 is attached to the heat radiating member 4 via a fixing member 72. However, you may make it attach by other means, such as attaching to the heat radiating member 4 directly.

  The heat radiating member 4 is made of a metal having good heat conduction and has a substantially cylindrical appearance. The heat dissipating member 4 has a large number of heat dissipating fins 41 protruding radially from the central portion. The heat dissipating fins 41 have a substantially fork shape in a top view, and have vertical groove portions 42 between the heat dissipating fins 41 to promote convection and increase the surface area (see FIG. 2). ).

  The reflector 5 is made of an aluminum material, and has an irradiation opening 51 as shown in FIGS. 1 and 4 and is formed in a bowl shape so as to expand toward the light irradiation direction. The inner peripheral surface is mirror-finished to form the reflecting surface 52, and the reflectance is increased. Specifically, the reflecting surface 52 is composed of a rotating curved body such as a rotating paraboloid obtained by rotating a parabola. The light emitted from the light emitting element 32 is reflected by the reflector 5, and predetermined light distribution control is performed.

  A circular plate-like cover 6 made of a transparent acrylic resin is attached to the front surface side of the reflector 5. As shown in FIG. 6, the cover 6 has a blasted surface on the inner surface side to form minute irregularities and lose gloss.

  As shown in FIG. 3, the ceiling reflector light 1 is inserted into the embedding hole of the ceiling reflector C, and both sides are supported by the support fittings 9 attached to the ceiling reflector C, and are fixed to the ceiling reflector C. . When power is supplied from the lighting device to the light source unit 3 via the lead wire 34, the light emitting elements 32 are turned on all at once, and the light source unit 3 can be used as a planar light source. The light emitted from each light emitting element 32 is mainly transmitted through the cover 6 and irradiated outward. A part of the light is reflected by the reflector 5, is subjected to light distribution control, passes through the cover 6, and is irradiated outward.

  On the other hand, the heat generated from each light emitting element 32 is transmitted from the back surface side of the substrate 31 to the base plate 7 and further conducted to the heat radiation fins 41 of the heat radiation member 4 to be effectively radiated. Therefore, the temperature rise of the light emitting element 32 can be suppressed.

  Here, with reference to FIG. 7, the light emission effect | action from the light source part 3 is explained in full detail. FIG. 7 is an example showing a case where the cover Cv is formed of a transparent acrylic resin as a comparative example, that is, a case where blasting is not performed.

  Basically, the light directly transmitted from the light emitting element 32 through the cover Cv and emitted outward, and the light reflected by the reflecting surface 52 of the reflector 5 and transmitted through the cover Cv and emitted outward are: Light distribution is controlled at a light shielding angle θ defined by the position of the irradiation opening 51 of the reflector 5. Accordingly, in the drawing, the lower part of the irradiation surface such as the wall surface is brightly illuminated below the point A, and the upper part of the point A is shielded and not irradiated.

  However, when the light emitted from the light emitting element 32 enters the cover Cv, for example, when entering the point C in the drawing, it becomes a critical angle, and the light emitted from the light emitting element 32 is within the cover Cv. There may be total reflection on the surface. Then, the totally reflected light is further reflected by the reflecting surface 52 and irradiated outward. This outwardly irradiated light reaches point B on the irradiation surface such as a wall surface in the figure. Therefore, the phenomenon above the point B may be brightly illuminated by such a phenomenon.

  As a result, on the irradiated surface, the area below point A is illuminated brightly, and the area above point B is also illuminated brightly, resulting in a dark shadow that is not illuminated between points A and B in the middle. These do not appear as clear boundaries at each point, but appear as bright and dark at each point, and uneven irradiation occurs on the irradiated surface.

  The above phenomenon is considered to be caused by various factors such as the strong directivity of the light emitted from the light emitting element 32 and the curved surface shape and length dimension of the reflecting surface 52.

  In the present embodiment, the surface on the inner surface side of the cover 6 is blasted. Therefore, for example, light entering the point C in the figure is diffused at various angles due to minute irregularities on the surface, and total reflection is suppressed, and the phenomenon of illuminating above the point A in the figure is suppressed. Is done. Accordingly, unintended irradiation unevenness can be suppressed, and light distribution can be controlled at the original desired light shielding angle θ.

  As described above, according to the present embodiment, the ceiling reflector light that can suppress irradiation unevenness and maintain a desired light distribution state with a simple configuration by blasting the inner surface side of the cover 6. 1 can be provided.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 8 shows the cover 6a. This cover 6a is obtained by blasting only the peripheral edge on the inner surface side. In this configuration, the light emitted from the light emitting element 32 is subjected to a blasting process on a region where it is assumed that the light is totally reflected on the inner surface side of the cover 6a. Therefore, the light incident on the blasted region is diffused at various angles, the total reflection is suppressed, and the light is directly transmitted through the cover 6a from the central portion that is not blasted to the outside. .
As described above, the present embodiment can provide the same effects as those of the first embodiment.

  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, the blasting process applied to the cover may be performed on both the inner and outer surfaces. Moreover, you may perform not only the whole inner surface side but partial.

  The lighting device is preferably used for lighting in a production space such as stage lighting, but can be applied to lighting equipment and display devices used indoors or outdoors.

DESCRIPTION OF SYMBOLS 1 ... Illuminating device (ceiling reflector light), 3 ... Light source part, 5 ... Reflector,
6, 6a ... cover, 32 ... light emitting element (LED), 51 ... irradiation opening,
52 ... Reflective surface

Claims (1)

A light source unit having a light emitting element as a light source;
A reflector having an irradiation opening to which light emitted from the light emitting element is irradiated outward, and having a reflection surface formed on the inner surface side so as to expand toward the irradiation opening;
A translucent cover that covers the irradiation opening and at least a peripheral edge on the inner surface side is blasted;
An illumination device comprising:

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