JP2011040236A - Light source unit, light source device and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source unit, a light source device, and an illumination device, wherein a light-emitting element is disposed at a focus of a reflective surface, light is effectively radiated to an object and a desired light distribution is easily acquired. <P>SOLUTION: The light source unit includes: the light-emitting element 52 such as an LED arranged and installed on the inner surface of a side wall 4; and the reflective surface 31 which is opposed to the light-emitting element 52 so that the side wall 4 is parallel with an irradiation direction and is formed with a portion of a curved surface composed of a paraboloid of revolution or the like obtained by revolving a parabola which is open in the irradiation direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light source unit, a light source device, and a lighting device that are suitable for performing a light-up that beautifully produces a night landscape.

2. Description of the Related Art Conventionally, in a lighting device, a shape of a reflecting surface that reflects light emitted from a lamp is a rotating paraboloid obtained by rotating a parabola, and the light center of the lamp is arranged at the focal point of the rotating paraboloid. (For example, refer to Patent Document 1). Thereby, the light reflected by the reflecting surface is irradiated as substantially parallel light. Therefore, for example, in order to illuminate a spot by irradiating it with an object, it is preferable to arrange the light center of the lamp at the focal point of the reflecting surface with the configuration shown in Patent Document 1. It becomes.

JP 2008-117558 A (paragraph [0016])

  However, when a light-emitting element such as an LED is used as a light source, the LED or the like is usually surface-mounted on a substrate and has a flat plate shape. Therefore, the light center of the LED or the like is, for example, a reflection surface made of a paraboloid of revolution. It is difficult to arrange the focal point by adjusting the height position. For this reason, there arises a problem that the opening of the beam becomes large or the reflected light is diffused, so that the object cannot be effectively irradiated with light.

  The present invention has been made in view of the above problems, and can arrange a light emitting element at the focal point of a reflecting surface, can irradiate light effectively on an object, and obtain an intended light distribution. An object is to provide an easy light source unit, a light source device, and an illumination device.

  The light source unit according to claim 1 has a light emitting element disposed on an inner surface of a side wall; a curved surface that faces the light emitting element so that the side wall is parallel to the irradiation direction and expands toward the irradiation direction. And a reflecting surface formed by a part.

  In the present invention and the following inventions, the technical meaning and interpretation of terms are as follows unless otherwise specified. The side wall may be an independent member or may be a part of another member, and in short, means a portion disposed so as to be orthogonal to the irradiation surface.

  A light emitting element is solid light emitting elements, such as LED and organic EL. The light emitting element is preferably mounted by a surface mounting method or a chip-on-board method, but the mounting method is not particularly limited due to the nature of the present invention. Moreover, the reflective surface formed in the curved surface includes, for example, a reflective surface formed on a paraboloid of revolution, a spheroidal surface, or the like, and is not limited to a particular form.

  The light source unit according to claim 2 is characterized in that, in the light source unit according to claim 1, the reflection surface is constituted by a rotating paraboloid obtained by rotating a parabola.

  The light source device according to claim 3 includes a base; and a plurality of light source units according to claim 1 or 2 disposed on the base, wherein the plurality of light source units are arranged at a center side of the base. It is arranged so as to be rotationally symmetric as viewed from the irradiation direction.

  The base may be an independent member or a part of another member, and means, for example, a mounting surface or a mounting portion of the light source device to the lighting device. Further, the light source unit may be disposed directly on the base or indirectly via another member.

  According to a fourth aspect of the present invention, there is provided a lighting device comprising: a main body; and a plurality of the light source devices according to the third aspect disposed in the main body.

  As the illuminating device, a projector is preferable. However, the lighting device is not limited to the projector, and can be applied to various luminaires used indoors or outdoors.

According to the invention described in claim 1 or claim 2, since the light emitting element can be arranged at the focal point of the reflecting surface, it is possible to effectively irradiate the object with light and facilitate the intended light distribution design. Is possible.
According to invention of Claim 3, size reduction can be achieved, ensuring predetermined illumination intensity.

  According to the fourth aspect of the present invention, since a plurality of light source devices are arranged, it is possible to provide an illuminating device capable of irradiating light according to the target illuminance.

It is a perspective view which shows the light source device which concerns on the 1st Embodiment of this invention. It is the same exploded perspective view. It is the same top view. It is the same front view. FIG. It is a top view for demonstrating the effect | action. It is a schematic plan view which shows the light source device which concerns on the 2nd Embodiment (Example 1) of this invention. It is a schematic plan view which shows the light source device which concerns on the same (Example 2). It is a schematic plan view which shows the light source device which concerns on the same (Example 3). It is a top view which shows the illuminating device which concerns on embodiment of this invention. It is the same front view. It is the same side view. It is sectional drawing which expands and shows the principal part. It is the top view and sectional drawing which show the conventional light source unit.

  The light source device according to the first embodiment of the present invention will be described below with reference to FIGS. 1 is a perspective view showing a light source device, FIG. 2 is a perspective view schematically showing the light source device, FIG. 3 is a plan view thereof, FIG. 4 is a front view thereof, and FIG. A sectional view taken along line Y, FIG. 6, is a schematic plan view for explaining the same action.

  As shown in FIGS. 1 to 5, the apparatus main body 1 as a light source device includes a base 2 and a substrate mounting member 4 as a side wall arranged so as to stand up with respect to the base 2. A reflector 3 is attached to the base 2, and a light source unit 5 is attached to the substrate attachment member 4.

  The base 2 has a substantially rectangular plate shape with corners cut, and is formed of an aluminum material. The base 2 is formed with a bolt hole for mounting to a lighting device to be described later, a screw hole for fixing the reflector 3, and the like. (See FIG. 2).

  A reflector 3 having a substantially rectangular parallelepiped shape is fixed to the base 2. The reflector 3 is integrally formed of a metal such as aluminum, and specifically, is fixed from the back side of the base 2 by screwing or the like. The four side surfaces of the reflector 3 are formed with reflecting surfaces 31 that open to the outside. The reflecting surface 31 is configured by a part of a curved surface, and is configured as, for example, a rotating paraboloid obtained by half-rotating a parabola. Therefore, as shown in FIG. 3, in a plan view, the outer shape formed by the upper end portion of the reflecting surface 31 is a semicircular shape in which the arc-shaped portion is located inside, and the four reflecting surfaces 31 are 90 ° Arranged rotationally symmetrical. In addition, the reflecting surface 31 is subjected to mirror surface treatment, white coating, or the like, and is configured to have a high reflectance.

  In addition, you may make it comprise the reflective surface 31 with the member separate from the reflector 3. FIG. Further, the reflector 3 is not limited to metal, and may be formed of synthetic resin or the like. Also, the reflector 3 is not formed integrally, but is divided into a plurality of blocks, which are combined and integrated. You may do it.

  Next, the opposing substrate mounting members 4a and 4b as side walls are formed in a substantially rectangular plate shape and are formed of a material having good thermal conductivity such as aluminum, and have a function as a heat conducting member. is doing. And the light source part 5 is attached to the inner surface side of this board | substrate attachment member 4a, 4b by screwing.

  The light source unit 5 includes a substrate 51 and an LED 52 as a light emitting element mounted on the substrate 51. The board | substrate 51 consists of a flat plate of the glass epoxy resin which is an insulating material, and the wiring pattern formed with the copper foil is given to the surface side. In addition, when the material of the substrate 51 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 52 is a surface-mount type LED package, which is roughly an LED chip disposed in a main body formed of ceramics, and a transparent mold for epoxy resin, silicone resin, or the like that seals the LED chip. It consists of a light-sensitive resin. The LED chip is a blue LED chip that emits blue light. The translucent resin for molding contains a phosphor that absorbs light emitted from the LED chip and generates yellow light, and the light emitted from the LED chip passes through the translucent resin of the LED package. It is emitted in the form of white light-emitting colors such as white and light bulb. Note that the LED may be directly mounted on the substrate 51 by a chip-on-board method, and the mounting method is not particularly limited.

  Thus, the board | substrate attachment members 4a and 4b to which the light source part 5 was attached are attached to the four side parts of the reflector 3 by screwing or the like. In the state in which the substrate attachment members 4a and 4b are attached, the substrate attachment members 4a and 4b as side walls are arranged so as to be parallel to the irradiation direction of the reflection surface 31, as shown in FIG. The LED 52 is opposed so as to be surrounded by the reflecting surface 31 of the rotating paraboloid obtained by half-rotating the parabola, and the LED 52 is arranged at the focal point of the parabolic surface of the reflecting surface 31. .

  The substrate mounting members 4a and 4b are disposed in a positional relationship such that they are erected in the vertical direction with respect to the base 2, and the surface opposite to the base 2 is configured as an irradiating unit 6, and the reflecting surface 31. Is formed by a part of the curved surface that expands in the irradiation direction, that is, from the base 2 side toward the irradiation unit 6 side. Furthermore, as shown in FIG. 4, the lower end portion of one of the opposing substrate mounting members 4a comes into contact with the upper surface of the base 2 and is thermally coupled, and the other substrate mounting member 4b The lower end portion extends to substantially the same position as the lower surface of the base 2, and comes into contact with and thermally couples to the housing of the lighting device described later.

  In such a configuration, the substrate mounting members 4a and 4b which are side walls, the LED 52 which is a light emitting element disposed on the substrate mounting members 4a and 4b, and the reflection surface 31 constitute a light source unit. Therefore, the plurality of light source units in the light source device, specifically, the four light source units, are configured to be rotationally symmetrical as viewed from the irradiation direction so that the curved surface of the reflecting surface 31 faces the center side of the base.

  Next, the operation of the present embodiment configured as described above will be described. When the power is turned on and the LED 52 is energized through the substrate 51, the LED 52 emits light, and the light is reflected mainly by the reflecting surface 31 and emitted toward the irradiation unit 6. Here, since the LED 52 is disposed at the focal point of the reflection surface 31, the light traveling toward the irradiation unit 6 becomes a parallel light beam without inadvertently increasing or diffusing the beam. It becomes radiated. Therefore, it is possible to irradiate light effectively by applying a spot to the object, and it is possible to facilitate the intended light distribution design.

  Subsequently, as shown in FIG. 14, in the conventional light source unit, for example, an LED mounted on a substrate is arranged at the bottom of a reflective surface formed in a bowl shape and a curved surface shape. However, since the irradiation angle of the LED is narrower than that of an incandescent lamp or the like, it is difficult to arrange the LED at the focal point of the reflecting surface, and the reflected light from the reflecting plate cannot be used effectively.

  However, in this embodiment, since the LED 52 is disposed on the substrate mounting members 4a and 4b which are side walls, the entire area of the reflecting surface 31 can be effectively used without causing the above-described disadvantages. Is possible.

  As shown in FIG. 6, in the present embodiment, the reflection surface 31 is formed in four semicircular shapes obtained by roughly dividing a circle drawn by a predetermined radius in plan view. The four semicircular portions A, B, C, and D are portions from which light emitted from the LED 52 is emitted. The area of these portions is proportional to the illuminance, and an increase in the area improves the illuminance. It is connected.

  Temporarily, in this reflector 3, when an LED is arranged at the bottom of a reflective surface formed like a bowl as in the prior art, and a circular reflective surface M (shown by a broken line) having the same radius as the reflective surface 31 is configured. The area of the reflection surface M is about half that of the reflection surface 31 of the present embodiment. That is, in this embodiment, since the total area is A + B + C + D, it is possible to secure an area that is approximately twice the area of the reflective surface M, and an improvement in illuminance can be achieved. In other words, the LED 52 is arranged on the substrate mounting members 4a and 4b which are the side walls, and the reflection surface 31 is divided and arranged in, for example, a semicircular shape corresponding thereto, thereby reflecting on the upper surface of the reflector 3. The ratio occupied by the arrangement area of the surface 31 can be increased, that is, the density of the arrangement area of the reflection surface 31 can be improved. Therefore, it is possible to reduce the size of the apparatus main body 1 while ensuring a predetermined illuminance.

  As described above, according to the present embodiment, it is possible to effectively irradiate the object with light, and it is possible to facilitate the intended light distribution design. Moreover, the reflecting surface 31 can be used effectively, and further, the apparatus main body 1 can be downsized while ensuring a predetermined illuminance.

  Next, a light source device according to a second embodiment of the present invention will be described with reference to FIGS. The figure is a schematic plan view of the light source device. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent, and the overlapping description is abbreviate | omitted.

  (Embodiment 1) As shown in FIG. 7, in this embodiment, a plurality of reflecting surfaces 31 of a reflector 3 are arranged in a straight line in plan view. As in the first embodiment, the LED 52 is disposed inside the substrate mounting member 4 that is a side wall. Therefore, according to the present embodiment, the LED 52 can be disposed at the focal point of the reflecting surface 31, the object can be effectively irradiated with light, and the intended light distribution design can be facilitated. .

  (Embodiment 2) As shown in FIG. 8, in this embodiment, a plurality of reflecting surfaces 31 of the reflector 3 are alternately arranged in a plan view, in a straight line, and in different directions. The LED 52 is disposed inside the opposing substrate mounting member 4. According to the present example, it is possible to achieve the same effect as the first embodiment.

  (Embodiment 3) As shown in FIG. 9, in this embodiment, the reflector 3 is formed in a substantially cylindrical shape, and the LED 52 is disposed on the side wall thereof. The reflecting surface 31 is arranged in a 90 ° rotational symmetry in plan view. The same effect as that of the first embodiment can also be achieved by this example.

  Next, a lighting device according to an embodiment of the present invention will be described with reference to FIGS. The figure is a schematic plan view of the light source device. In addition, the same code | symbol is attached | subjected to the part which is the same as that of 1st Embodiment, or an equivalent, and the overlapping description is abbreviate | omitted.

  The figure shows a projector 10 as an illumination device. The projector 10 includes a box-shaped casing 11 as a main body and a plurality of the light source devices attached in the casing 11. The housing 11 has an opening on the front side, and a translucent front cover 12 is attached to the opening via a packing. The front cover 12 can be made of a material such as polycarbonate or glass. Ten light source device main bodies 1 are arranged side by side on the bottom wall in the housing 11 and attached by mounting bolts B (shown in FIGS. 1, 3, and 4).

  As shown in FIG. 13, when the apparatus main body 1 is attached to the bottom wall of the housing 11, the base 2 of the light source device is in surface contact with the bottom wall of the housing 11. Further, the lower end portion of the board mounting member 4 b is also in contact with the bottom wall of the housing 11. Therefore, the base 2 and the board mounting member 4b are thermally coupled to the housing 11 respectively.

  The casing 11 is supported by a U-shaped arm 13 so that the elevation angle can be changed, that is, the light irradiation direction can be changed. A power line 14 is led out from the bottom wall of the housing 11 through a cable gland. The power supply line 14 is connected to the light source device and is connected to a power supply device (not shown) for supplying power to the light source device.

  The projector 10 configured as described above is used by installing the arm 13 on, for example, a structure or the like, adjusting the irradiation direction toward the object, and turning on the power. Thereby, the light emitted from the light source device passes through the front cover 12 and is irradiated onto the object. In this case, heat is generated from the LED 52, but the heat is conducted to the substrate mounting member 4 through the substrate 51, and the heat from one substrate mounting member 4a is transmitted from the base 2 to the housing 11 and the reflector 3, Heat from the other board mounting member 4 b is directly transmitted to the housing 11. The heat transmitted to the housing 11 is radiated mainly from the outer periphery of the bottom wall and side wall of the housing 11. At this time, since the side wall is formed to have a relatively large height dimension, the surface area is increased, and the heat radiation action is effectively performed. Note that by appropriately selecting the number of light source devices arranged in the housing 11, it is possible to effectively irradiate the object with the target illuminance.

  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 reflecting surface is not limited to a paraboloid of revolution, and can be formed in a curved shape such as a spheroid. Further, the light emitting color of the light emitting element is not limited to white, but may be configured to be red, green, or blue light emitting color, or a color mixture of these to obtain a desired light emitting color, or a variable color. . Furthermore, the light source device may be configured without using a base as an independent member, and when the light source device is attached to the housing of the lighting device, for example, a reflector may be directly attached to the housing. Furthermore, as the lighting device, a projector is suitable, but it can be applied to various lighting fixtures used indoors or outdoors.

DESCRIPTION OF SYMBOLS 1 ... Light source device main body, 2 ... Base, 4 ... Side wall (board attachment member),
6 ... Irradiation part, 10 ... Illumination device (projector), 31 ... Reflecting surface,
52 .. Light emitting element (LED)

Claims (4)

A light emitting device disposed on the inner surface of the side wall;
A reflecting surface formed by a part of a curved surface facing the light emitting element so that the side wall is parallel to the irradiation direction and expanding toward the irradiation direction;
A light source unit comprising:   The light source unit according to claim 1, wherein the reflection surface is constituted by a rotating paraboloid obtained by rotating a parabola. With the base;
A plurality of light source units according to claim 1 or 2, disposed on the base;
And the plurality of light source units are arranged in rotational symmetry as viewed from the irradiation direction so as to face the center side of the base. With the body;
A plurality of light source devices according to claim 3 disposed in the body;
An illumination device comprising:

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