JP2013114916A - Light source unit, and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit, as well as a lighting device using the same, capable of effectively irradiating light on an object by restraining leaking light toward others.SOLUTION: The light source unit Lu is provided with a reflecting face 31 spreading in an irradiation direction of light and formed of at least a part of rotating curved surface formed by rotating a curve. The unit is also provided with light source portions 2 each having: a substrate 21 shifted in an optical axis direction from a focal point F of the reflecting face 31 and arranged in a direction nearly crossing the optical axis direction; and a light-emitting element 22 mounted on the substrate 21.

Description

  Embodiments of the present invention relate to a light source unit and a lighting device suitable for performing illumination in a light-up or a stadium that beautifully produces a night landscape.

  Conventionally, for example, in a lighting device such as a projector, the shape of a reflecting surface that reflects light emitted from a light source is a rotating paraboloid that rotates a parabola, and the optical center of the light source is disposed at the focal point of the rotating paraboloid. What to do is known. As a result, the light reflected by the reflecting surface is collected as substantially parallel light and irradiated onto the object. Therefore, it is preferable to place the light center of the light source at the focal point of the reflecting surface in order to illuminate by applying a spot to the object and effectively produce it.

  In recent years, light-emitting elements such as LEDs (light-emitting diodes) that can be expected to have a long life and power saving have been used as light sources. In this case, in order to increase the light output, the substrate is enlarged, a plurality of light emitting elements are mounted on the substrate, and the area of the light emitting surface is increased.

JP 2008-117558 A International Publication No. 2011/016236

  However, when a substrate mounted with a light emitting element as described above is placed at the focal point of the reflecting surface to irradiate substantially parallel light, direct light that is not reflected by the reflecting surface out of the light emitted from the light emitting element is reflected on the reflecting surface. It is radiated from the end part (opening end part) of the light beam and tends to increase as non-target leakage light. For example, the leaked light is unnecessarily diffused in an unintended direction without effectively acting on the object.

  The present invention has been made in view of the above problems, and an object thereof is to provide a light source unit capable of effectively irradiating light on an object while suppressing undesired leakage light and an illumination device using the light source unit. .

  The light source unit according to the embodiment of the present invention includes a reflecting surface that is formed by at least a part of a rotating curved surface that expands in the light irradiation direction and rotates a curve. In addition, the light source unit includes a substrate that is displaced in the optical axis direction with respect to the focal point of the reflecting surface, and that is disposed in a direction substantially orthogonal to the optical axis, and a light emitting element mounted on the substrate. ing.

  According to the embodiments of the present invention, it is possible to provide a light source unit that can effectively irradiate light on an object while suppressing light leakage that is not the object, and an illumination device that uses this light source unit.

It is a perspective view which shows the illuminating device which concerns on the 1st Embodiment of this invention. It is a front view which shows the same illuminating device. It is a side view which shows the same illuminating device. It is sectional drawing cut | disconnected and shown along the YY line in FIG. It is sectional drawing cut | disconnected and shown along the XX line in FIG. It is a perspective view which shows the reflector in the same illuminating device. It is a perspective view which shows the light source part in the illumination device. It is sectional drawing which shows typically the arrangement | positioning relationship between the focus of the reflective surface in the same illuminating device, and a light source part, (a) shows embodiment and (b) shows the comparative example. It is a perspective view which shows the illuminating device which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows typically the arrangement | positioning relationship between the focus of the reflective surface in the same illuminating device, and a light source part. In the illuminating device which concerns on the 3rd Embodiment of this invention, it is sectional drawing which shows typically the arrangement | positioning relationship between the focus of a reflective surface, and a light source part, (a) shows embodiment, (b) is a comparative example. Is shown.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5 show a lighting device, FIG. 6 shows a reflector, and FIG. 7 shows a light source unit. Further, FIG. 8 schematically shows the positional relationship between the focal point on the reflection surface of the reflector and the light source unit.

  As representatively shown in FIG. 1, a projector is shown as an illumination device. This projector is a substantially box-shaped casing 1 as a main body of the apparatus, a light source section 2 disposed in the casing 1, and the light emitted from the light source section 2 is reflected and irradiated in a target direction. The reflector 3 is provided. Further, a power supply unit 4 that supplies power to the light source unit 2 and an arm 5 that supports the housing 1 are provided.

  As shown in FIGS. 1 to 5, the housing 1 is made of an aluminum alloy die-cast, and the light irradiation direction side, that is, the front surface side is opened, and the light source unit 2 and the reflector 3 are accommodated. An accommodating space 11 is formed.

  Specifically, the opening on the front side has a shape such that a pair of octagons are adjacent and joined on one side, and the inner part that forms each octagonal cylinder from the opening toward the back side has A pair of light source devices Ld including a plurality of light source units 2 and reflectors 3 are disposed. The distance between the opposite sides of the octagon is about 400 mm to 500 mm. In addition, a plurality of plate-like heat radiating fins 12 are formed on the rear side of the housing 1 and on the outer surface thereof. The radiating fins 12 are substantially parallel to each other.

  As representatively shown in FIG. 7, the light source unit 2 is of a COB (chip on board) type, and includes a substrate 21, LED chips that are a plurality of light-emitting elements 22 mounted on the substrate 21, and a seal. And a stop member 23.

  For example, the substrate 21 is a flat plate made of a ceramic material such as white aluminum oxide, aluminum nitride, or silicon nitride, and is formed in a substantially rectangular shape with sides of 20 mm to 40 mm. A wiring pattern layer made of copper foil is formed on the surface side. Further, a resist layer is appropriately laminated thereon.

  Further, a pair of power supply terminals 24 connected to the wiring pattern layer is provided on one end side of the substrate 21. In addition, screw through holes 25 for attachment are formed in the vicinity of each corner of the substrate 21.

  In addition, the material of the substrate 21 is an insulating material such as glass epoxy resin (FR-4) or the like, or in order to enhance the heat dissipation of each light emitting element 22, the heat conductivity of aluminum or the like is good and the heat dissipation is good. A base substrate made of metal in which an insulating layer is laminated on one surface of an excellent base plate can be applied, and the material is not particularly limited.

  The plurality of light emitting elements 22 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 LED bare chip is arranged and bonded in a matrix on the substrate 21 using a silicone resin-based insulating adhesive, and is electrically connected to the wiring pattern layer by bonding wires.

  The sealing member 23 is a phosphor layer, and contains an appropriate amount of a phosphor such as YAG: Ce in a translucent synthetic resin, for example, a transparent silicone resin. The sealing member 23 is formed in a substantially square shape so as to cover the light emitting element 22 and the wiring pattern layer. The phosphor is excited by light emitted from the light emitting element 22 and emits light having a color different from the color of light emitted from the light emitting element 22. In the present embodiment in which the light emitting element 22 emits blue light, a yellow phosphor that emits yellow light having a complementary color relationship with blue light is used for the phosphor so that white light can be emitted. Has been.

  Note that a surface-mount LED package may be used as the light-emitting element. Further, a bullet-type LED may be mounted, and the mounting method and format are not particularly limited.

  As shown in FIGS. 1, 2, 4, and 5, there are a plurality of such light source units 2 on the back side (bottom) in the accommodation space 11 of the housing 1, specifically, one light source device. Four pieces per Ld are arranged to be 90 ° rotationally symmetric (refer mainly to FIG. 2). Further, the substrate 21 is thermally coupled with the back surface of the substrate 21 in contact with the bottom of the housing 1, and is attached by a mounting screw (not shown).

  As representatively shown in FIG. 6, the reflector 3 is made of a material such as aluminum and is formed in a concave shape so as to expand in the light irradiation direction, and the inner surface side is mirror-finished. A reflective surface 31 is formed. The reflective surface 31 is configured to have a mirror finish, white coating, or the like, and to have a high reflectance.

  The reflecting surface 31 is formed by combining a plurality of rotating curved surfaces obtained by rotating a curve. Specifically, four parts 32 of the paraboloid rotating the parabola are formed, and the opening on the light irradiation direction side has a shape in which four arcs are continuously connected in front view. (However, it is linear at the joint portion with the adjacent reflector 3), and the opposite side to the light irradiation direction side, that is, the central portion on the back side protrudes in an acute angle shape. Is formed.

  Further, a circular incident opening 33 is formed corresponding to a part 32 of each rotary paraboloid in the reflector 3. The incident opening 33 is an opening through which light emitted from the light source unit 2 is incident, and is formed on the parabolic axis of a part 32 of the paraboloid of revolution and on the back side. The light source unit 2 is arranged to face the incident opening 33.

  As shown in FIGS. 1 and 2, the reflector 3 configured as described above is disposed in the housing 1 so that a pair of reflectors 3 are adjacent to each other. Specifically, the flange 34 in the opening of the reflector 3 is supported and disposed on the opening edge on the front surface side of the housing 1.

  In addition, although it is preferable to comprise the reflective surface 31 by the rotation paraboloid which rotated the parabola, it is not limited to this. For example, it can be constituted by a rotating curved surface such as a spheroid.

  As shown in FIGS. 1 and 3 to 5, the power supply unit 4 is provided on the back side of the housing 1. A pair of power supply units 4 is provided corresponding to each light source device Ld, and is attached to the radiation fins 12 of the housing 1.

  The power supply unit 4 is configured by housing circuit components in an octagonal box-like case, and is connected to a commercial AC power supply AC, and receives the AC power supply AC to generate a DC output. The power supply unit 4 is configured, for example, by connecting a smoothing capacitor between output terminals of a full-wave rectifier circuit, and connecting a DC voltage conversion circuit and current detection means to the smoothing capacitor. Therefore, the power supply unit 4 is connected to the light source unit 2, supplies the direct current output to the light emitting element 22, and controls the lighting of the light emitting element 22. The power supply unit 4 may be connected to an external DC power supply DC, receive the DC power supply DC, and supply a DC output to the light emitting element.

  The mounting position of the power supply unit 4 is not limited to the back side of the housing 1. You may make it attach to the side surface side of the housing | casing 1, and you may make it attach to the arm 5. FIG. Furthermore, the shape of the case of the power supply unit 4 can be changed as appropriate according to the mounting position.

  As shown in FIGS. 1 to 3, the arm 5 is formed in a substantially U shape, and supports the housing 1 and can be adjusted so that the irradiation light can be irradiated in a target direction. Yes. The arm 5 includes a pedestal portion 51 and leg portions 52 extending from both end sides of the pedestal portion 51 in a substantially perpendicular direction.

  The leg portion 52 supports both sides of the housing 1 so as to be rotatable, that is, supports the light irradiation direction so that the elevation angle of the housing 1 can be changed. The elevation angle can be changed by tightening and loosening the handle 52a provided on the leg 52.

  The pedestal 51 is a part that is attached to a structure or the like and fixedly installs the projector on the structure or the like, and a rotating base 53 is formed at a substantially central portion of the pedestal 51. The turntable 53 is attached to a structure or the like by bolting. In this case, the casing 1 can be adjusted so that the irradiation light can be irradiated in a target direction by rotating the casing 1 in a direction (left-right direction) orthogonal to the elevation direction.

  As described above, the irradiation direction can be adjusted by adjusting the left and right directions by the rotary base 53 when the pedestal 51 is attached to a structure or the like, and by operating the handle 52 a provided on the leg 52. The elevation direction can be adjusted.

  A translucent front cover 6 is attached to the opening on the front side of the housing 1 to seal the opening hermetically through packing and ensure waterproofness. The front cover 6 can be made of glass or polycarbonate material.

  In the illumination device as described above, the light source unit Lu is configured by the light source unit 2 and the reflection surface 31 facing the light source unit 2. Specifically, the light source unit Lu is constituted by one light source unit 2 and a part 32 of a paraboloid of revolution facing the light source unit 2. Therefore, the illuminating device is composed of a plurality of light source units Lu.

  As shown in FIGS. 4 and 5, in the light source unit Lu, the reflection surface 31 formed by the part 32 of the paraboloid has a focal point F on the parabola axis. The light source unit 2 is arranged so as to be shifted in the optical axis direction with respect to the focal point F. That is, the light source unit 2 is not disposed at the focal point F.

  More specifically, the light source unit 2 is arranged on the apex side of the parabolic reflecting surface 31 with respect to the focal point F. The substrate 21 is disposed in a direction substantially orthogonal to the optical axis, and is disposed such that the light emitting surface side on which the light emitting element 22 is mounted faces the incident opening 33 of the reflector 3.

  The arrangement relationship between the focal point F of the reflecting surface 31 and the light source unit 2 will be described in detail with reference to FIG. FIG. 8 is a cross-sectional view schematically showing the arrangement relationship, FIG. 8 (a) shows the present embodiment, and FIG. 8 (b) shows a comparative example. In addition, the same code | symbol is attached | subjected and demonstrated to the part which is the same as that of the above-mentioned embodiment, or an equivalent part.

  First, in the comparative example of FIG. 8B, the light source unit 2 is disposed at the focal point F of the reflecting surface 31 formed from a paraboloid. In this case, most of the light emitted from the light emitting element 22 of the light source unit 2 and reflected by the reflection surface 31 is irradiated to the front side as parallel light.

However, since the light emitting surface of the light source unit 2 has an area of a predetermined size, direct light that is not reflected by the reflecting surface 31 out of the light emitted from the light emitting element 22 has a maximum angle θ _2. The light is irradiated from the opening of the light and diffused as undesired leakage light.

On the other hand, as shown in FIG. 8A, in the present embodiment, the light source unit 2 is arranged on the apex side while being shifted in the optical axis direction with respect to the focal point F of the reflecting surface 31. For this reason, of the light emitted from the light emitting element 22, direct light that is not reflected by the reflecting surface 31 is irradiated and diffused from the opening of the reflecting surface with the maximum angle θ ₁ .

In other words, the relationship of maximum angle θ ₁ <maximum angle θ ₂ related to leaking light is established, and in this embodiment, the maximum angle θ can be reduced, and the leaked light can be suppressed and reduced as compared with the comparative example. Become.

  Note that, by arranging the light source unit 2 so as to be shifted with respect to the focal point F of the reflection surface 31 as in the present embodiment, the parallel light reflected by the reflection surface 31 and irradiated to the front surface side is reduced accordingly. An evaluation result has been obtained that the effect as an effective irradiation light is not greatly affected.

  Next, the operation of this embodiment will be described. The lighting device is used by installing the arm 5 on, for example, a structure or the like, adjusting the irradiation direction toward the object, and turning on the power.

  When power is supplied to the power supply unit 4 in the installed state of the lighting device, the light emitting element 22 in the light source unit 2 is energized and the light emitting element 22 emits light. The light emitted from the light emitting element 22 passes through the sealing member 23, passes through the incident opening 33 in the reflector 3, is reflected directly or by the reflecting surface 31, and passes through the front cover 6 and is irradiated in the target direction. Is done. In this case, since the light source unit 2 is arranged so as to be shifted with respect to the focal point F of the reflection surface 31, it is possible to suppress diffusion of leakage light that is not reflected by the reflection surface 31.

  Further, heat is generated as the light emitting element 22 emits light. This heat is conducted mainly from the back side of the substrate 21 to the housing 1, and further conducted to the plurality of radiating fins 12 and effectively radiated by a large surface area. Thereby, the temperature rise of the light emitting element 22 can be suppressed.

  In addition, as shown in FIGS. 4 and 5, the light source unit 2 is located on the back side of the incident opening 33 formed so as to cut the apex side of the paraboloid in the reflecting surface 31. Accordingly, even when the light source unit 2 has a light emitting surface with a large area, the substantially entire surface of the light emitting surface can be made to face the entrance opening 33, and light from the light emitting surface can be effectively used in the usage direction. Can do.

  Furthermore, since the gap G is formed between the incident aperture 33 portion of the reflector 3 and the light source unit 2, a convection action occurs, and the temperature rise of the light source unit 2 can be reduced.

  As described above, according to the present embodiment, it is possible to provide a light source unit Lu that can effectively irradiate light on an object while suppressing leakage light that is not intended, and an illumination device using the light source unit Lu.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 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.

  The illuminating device of this embodiment has shown what was comprised by the single light source device Ld and the light source unit Lu. Accordingly, the light source device Ld is the same as the light source unit Lu, and the light source device Ld = the light source unit Lu.

  The light source unit Lu includes a light source unit 2 and a reflecting surface 31. Similar to the first embodiment, the light source unit 2 is of a COB (chip on board) type, and includes a substrate 21, LED chips that are a plurality of light emitting elements 22 mounted on the substrate 21, and sealing And a member 23. In order to realize a desired light output, it is preferable to apply a substrate having a size slightly larger than that of the first embodiment and a large light emitting surface area.

  The reflector 3 is made of a material such as aluminum, and is formed in a concave shape so as to expand in the light irradiation direction, and the reflection surface 31 is formed by mirror-finishing the inner surface side.

  The reflecting surface 31 is formed of a rotating curved surface whose substantially entire surface is rotated. Specifically, substantially the entire surface is formed by a rotating paraboloid obtained by rotating a parabola.

As mainly shown in FIG. 10, the light source unit 2 is disposed on the apex side with respect to the focal point F of the reflecting surface 31 so as to be shifted in the optical axis direction. Therefore, among the light emitted from the light emitting element 22, the direct light is not reflected on the reflecting surface 31 is irradiated from the opening of the reflective surface 31 the maximum angle theta is reduced as the maximum angle theta ₁ as spread Become.

  Therefore, according to the present embodiment, similarly to the first embodiment, it is possible to provide a light source unit Lu and an illumination device that can effectively irradiate light on an object while suppressing undesired leakage light.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 11 shows an arrangement relationship between the focal point F of the reflecting surface 31 corresponding to FIG. 8 and the light source unit 2. Fig.11 (a) shows this embodiment, FIG.11 (b) shows a comparative example. 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.

  As shown in FIG. 11A, in the present embodiment, the light source unit 2 is arranged on the opposite side (upper side) from the apex side with respect to the focal point F of the reflecting surface 31 in the optical axis direction. In this case, the reflection surface 31 is formed so that the opening of the paraboloid is relatively narrow, that is, the case where the reflection surface 31 is formed to have a large curvature.

  As shown in FIG. 11B, when the opening of the paraboloid on the reflecting surface 31 is narrow, the focal point F of the reflecting surface 31 approaches the apex side. For this reason, if a light source having a large light emitting surface area is used as the light source unit 2 and the light source unit 2 is arranged at the focal point F, the incident aperture 33 of the reflector 3 becomes small. The problem arises that is not effectively used.

  According to the present embodiment, since the light source unit 2 is shifted in the optical axis direction with respect to the focal point F of the reflecting surface 31 and arranged on the upper side, the incident opening 33 can be formed large, and the light source unit 2 The light from the light source unit 2 can be used effectively by making the light emitting surface face the incident opening 33.

In this case, the maximum angle θ ₁ related to leakage light is larger than that in the comparative example shown in FIG. However, this is originally the case where the opening of the rotating paraboloid on the reflecting surface 31 is narrowly formed, and the diffusion of leakage light is suppressed by the narrow opening of the rotating paraboloid. .

  Therefore, according to this embodiment, while effectively using the light emitting surface of the light source unit 2, it is possible to produce an effect of effectively irradiating light on a target object while suppressing undesired leakage light.

  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. Moreover, each said embodiment is shown as an example and is not intending limiting the range of 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. Moreover, a light emitting element is solid light emitting elements, such as LED and organic EL. The mounting of the light emitting element is preferably a COB (chip on board) type, but the mounting method is not particularly limited due to the nature of the present invention. It may be implemented by an SMD (surface mount device) type.

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, 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 ... Apparatus main body (casing), 2 ... Light source part,
3 ... reflector, 4 ... power supply unit,
5 ... arm, 6 ... front cover,
21 ... substrate, 22 ... light emitting element (LED),
23 ... Sealing member, 31 ... Reflecting surface,
32 ... a part of a paraboloid of revolution, 33 ... an entrance aperture,
Ld ... light source device, Lu ... light source unit,
F ... Focus on reflective surface

Claims (2)

A reflecting surface formed by at least a part of a rotating curved surface that is expanded toward the light irradiation direction and rotates the curve;
A light source unit including a substrate that is displaced in the optical axis direction with respect to the focal point of the reflecting surface and that is disposed in a direction substantially orthogonal to the optical axis; and a light emitting element mounted on the substrate;
A light source unit comprising: The device body;
An illumination apparatus comprising the light source unit according to claim 1 disposed in the apparatus main body.

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