JP2013168292A - Light source unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source unit capable of efficiently cooling down light-emitting elements.SOLUTION: A plane light source unit 10 provided with LEDs 20 and a substrate 24 on which the LEDs 20 are mounted is composed of a platy loading plate 41 made of a high thermally conductive material, on a surface side of which the substrate 24 is loaded, a platy material 42 arranged in separation on a rear face 41B side of the loading plate 41, an air path forming body 43 for forming a plurality of air paths 62 between the loading plate 41 and the platy material 42 extending from a central part 60 to an outer circumferential part 61 of the loading plate 41, and a vacuum fan 44 for sucking out cooled air from the central part 60 through a sucking out port 66 provided in the platy material 42 and flowing the cooled air to each of the air paths 62.

Description

  The present invention relates to a light source unit including a light emitting element such as an LED as a light source.

Conventionally, various LED lighting fixtures using an LED as an example of a light emitting element as a light source are known (see, for example, Patent Document 1). On the other hand, since the amount of heat generated by the LED increases with the increase in the output of the LED, a countermeasure against the heat generation of the LED is required in order to extend the life of the LED.
Therefore, in conventional lighting fixtures, a large number of heat radiation fins are provided in the lighting fixture body, and the heat of the LED transferred to the lighting fixture body is dissipated from the radiation fins, or the lighting fixture body itself is used for the amount of heat generated by the LEDs. On the other hand, various technologies such as a technology that has a sufficient heat capacity, absorbs heat generated by the LED, and dissipates heat from the surface have been proposed.

JP 2007-234558 A

However, it is necessary to cool the LEDs more efficiently when the number of LEDs increases or when the output of the LEDs increases.
This invention is made | formed in view of the situation mentioned above, and aims at providing the light source unit which can cool a light emitting element efficiently.

  In order to achieve the above object, the present invention provides a light source unit comprising a light emitting element and a substrate on which the light emitting element is mounted. A plurality of air passages extending from the center portion of the mounting plate to the outer peripheral portion between the mounting plate, the plate material spaced apart on the back side of the mounting plate, and the mounting plate and the plate material. An air path forming body to be formed, and a fan that blows or sucks cooling air from the opening provided in the plate member and draws the cooling air into each of the air paths.

  Further, the present invention is characterized in that the light source unit includes a housing, the inside of the housing is partitioned by the mounting plate described above, and air flow between the front surface side and the back surface side of the mounting plate is blocked. And

  Further, the present invention is characterized in that the light source unit includes an electric circuit for lighting the light emitting element, the plate member is formed of a high thermal conductivity material, and the electric circuit is attached to the plate member.

  According to the present invention, the plurality of air paths provided on the back surface side of the mounting plate by the air path forming body cool the entire surface from the center to the outer periphery of the mounting plate. The substrate and the light emitting element can be efficiently cooled through the mounting plate.

It is a perspective view of the light source device for light guides concerning the embodiment of the present invention. It is a figure which shows the structure of the light source device for light guides, (A) is a front view, (B) is a side view, (C) is a rear view. It is sectional drawing of the light source device for light guides. It is a figure which shows an example of the characteristic of the test | inspection light which the light source device for light guides radiates | emits, (A) shows the illumination intensity distribution of a light beam cross section, (B) shows a light distribution characteristic. It is a figure which shows the structure of a surface light source unit, (A) is the perspective view seen from the light emission surface side, (B) is the perspective view seen from the back side. It is a perspective view which shows the state which removed the reflecting mirror in FIG. 5 (A). It is the disassembled perspective view which looked at the built-in unit of a surface light source unit from the upper side. It is the disassembled perspective view which looked at the built-in unit of a surface light source unit from the lower side. It is the perspective view which looked at the built-in unit from the lower side. It is a figure which shows the embedded type lighting fixture which applied the surface light source unit. It is a figure which shows the spot type lighting fixture which applied the surface light source unit.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a light guide light source device 1 according to this embodiment. 2A and 2B are diagrams showing the configuration of the light guide light source device 1. FIG. 2A is a front view, FIG. 2B is a side view, and FIG. 2C is a rear view. FIG. 3 is a cross-sectional view of the light guide light source device 1.
The light guide light source device 1 is used for inspecting the optical characteristics of a bundle fiber 9 as an example of a light guide, and emits inspection light incident on the bundle fiber 9. As shown in FIGS. The apparatus main body 2 and a plurality of handles 3 as gripping portions are provided. The apparatus body 2 includes a housing 4, a connection flange 6, and a surface light source unit 10. FIG. 3 shows a state where the connection flange 6 is removed.

The bundle fiber 9 is an optical fiber configured by bundling a large number of fibers (elementary wires) and attaching terminal fittings to both ends thereof, and has an effective core area (core diameter) larger than that of the strand fibers. The numerical aperture NA is defined by the numerical aperture NA of the strands. Of course, a single optical fiber may be used as the light guide instead of the bundle fiber 9.
The casing 4 has a cylindrical shape with both ends opened, and as shown in FIG. 3, the opening on one end side of the casing 4 is configured as an emission port 5, and the inspection light is coaxial with the central axis of the casing 4. Is emitted from the emission port 5. As shown in FIG. 1, the connection flange 6, which is a connection tool for connecting the bundle fiber 9 to be inspected, is detachably attached to the emission port 5 of the housing 4 by a latch 7. The exit 5 of the housing 4 is covered with a second diffusion plate 14, and the bundle fiber 9 is connected to the connection flange 6, so that the incident end face of the bundle fiber 9 faces the second diffusion plate 14. (Parallel to each other). At this time, the size of the second diffusion plate 14 is set to cover the incident end face of the bundle fiber 9 (more precisely, the effective core diameter of the bundle fiber 9).
As shown in FIGS. 1 and 2, each of the handles 3 is provided so as to protrude outward from the peripheral surface of the housing 4, and at least two handles 3 function as legs of the housing 4 to roll. To prevent.
As shown in FIG. 3, the surface light source unit 10 is provided at the rear end portion 8 of the housing 4, and has a substantially parallel light (hereinafter referred to as a surface shape) that travels along the central axis K in the housing 4. Emits parallel light). The light beam cross section of the planar parallel light is a circle having a diameter slightly smaller than the inner diameter R of the housing 4 and has a diameter larger than the effective core diameter of the bundle fiber 9 to be inspected. The configuration of the surface light source unit 10 will be described in detail later.

  In the apparatus main body 2, as shown in FIG. 3, a first diffusion plate 12 and a second diffusion plate 14 are sequentially arranged between the surface light source unit 10 and the emission port 5. The transmitted light passes through the first diffusion plate 12 and the second diffusion plate 14 in order, and is emitted from the emission port 5 as inspection light. The first diffusion plate 12 and the second diffusion plate 14 are plate-like members having a relatively high transmittance, and have different diffusion angles α. For the first diffusion plate 12 and the second diffusion plate 14, so-called lens diffusion plates (LSD: Light Shaping Diffusers) that distribute transmitted light within the range of the diffusion angle α are preferably used.

The diffusion angle α of the first diffusion plate 12 and the second diffusion plate 14 is a full angle representing the position at which the central luminance of the diffused light obtained by entering parallel light is half value. If the diffusion angle of the first diffusion plate 12 is α1, the light transmitted through the first diffusion plate 12 becomes diffused light that diffuses at the diffusion angle α1. Further, when the diffusion angle of the second diffusion plate 14 is α2, the diffusion light obtained by transmitting through the first diffusion plate 12 transmits through the second diffusion plate 14, and thus the diffusion angle θ of the following formula (1) Diffused light diffuses at Therefore, the diffusion angle θ of the inspection light can be changed by appropriately changing the diffusion angles α1 and α2 of the first diffusion plate 12 and the second diffusion plate 14.

Here, in order for light incident on the optical fiber 9 to propagate through the effective core of the bundle fiber 9, the numerical aperture of the bundle fiber 9 is NA and the incident angle of incident light is β. The maximum angle β is defined by the following equation (2). The incident angle β is a half angle of the half value angle 2β of the light distribution characteristic of the incident light.

That is, in this light guide light source device 1, since the diffusion angle θ of the inspection light corresponds to the incident angle β, in order to obtain inspection light propagating through the bundle fiber 9, the diffusion angle θ is expressed by the following equation (3). It is necessary to satisfy the relationship.

Therefore, by selecting the diffusion angles α1 and α2 of the first diffusion plate 12 and the second diffusion plate 14 based on the equation (1) so as to satisfy the equation (3), the bundle fiber 9 to be inspected is selected. Can be obtained.
When inspecting bundle fibers 9 having different numerical apertures NA, the first diffusion plate 12 and the second diffusion plate 14 having diffusion angles α1 and α2 corresponding to the numerical aperture NA can be replaced with other ones. Inspection light suitable for the bundle fiber 9 having a numerical aperture NA can be easily obtained.
Furthermore, since the two first diffusion plates 12 and the second diffusion plate 14 are combined to obtain the inspection light having the diffusion angle θ, the diffusion angle θ can be set as compared with the case where only one diffusion plate is used. Easy to change.

As will be described in detail later, the surface light source unit 10 is configured such that a plurality of LEDs 20 as light emitting elements are arranged on the surface, and each LED 20 emits light to obtain planar parallel light. By using the LED 20 as the light source in this manner, only light in a predetermined wavelength region can be emitted, so that light in a predetermined wavelength region can be emitted compared to the case where a lamp that emits light in a wide wavelength region is used as the light source. There is an advantage that it is not necessary to provide a wavelength selection filter for obtaining.
Further, in order to obtain parallel light by the plurality of LEDs 20, illuminance unevenness in which the illuminance increases at the position of each LED 20 occurs in the cross-section of the parallel light. However, in the light guide light source device 1, the surface light source unit 10. Is transmitted through the first diffusion plate 12 and the second diffusion plate 14, and thus light with reduced illuminance unevenness is obtained by the diffusion effect of the first diffusion plate 12 and the second diffusion plate 14.

At this time, as the distance from the first diffusion plate 12 to the emission port 5 is longer, the illuminance unevenness is reduced until the emission port 5 is reached. Therefore, in the present embodiment, as shown in FIG. 3, the first diffusion plate 12 is arranged closer to the surface light source unit 10 side than the exit port 5 (more precisely, the light emitting surface of the surface light source unit 10 is arranged). Placed in the vicinity). Thereby, the illuminance unevenness generated in the parallel light by the light emission of the plurality of LEDs 20 can be suppressed until reaching the emission port 5.
However, when the first diffusion plate 12 is brought closer to the surface light source unit 10 side, the parallel light diffuses at the diffusion angle α1 after passing through the first diffusion plate 12, so Light incident on the inner peripheral surface 4A is generated, and the amount of light at the edge of the beam cross section is reduced. Therefore, in the present embodiment, the second diffusion plate 14 is disposed at the exit port 5, and is diffused by the second diffuser plate 14 when light whose amount of light has decreased at the edge of the light beam cross section is emitted from the exit port 5. By radiating the light, inspection light with reduced illuminance unevenness due to a decrease in the amount of light at the edge of the light beam cross section is obtained.

4A and 4B are diagrams illustrating an example of the characteristics of the inspection light emitted from the light guide light source device 1. FIG. 4A illustrates the illuminance distribution of the light beam cross section, and FIG. 4B illustrates the light distribution characteristics. . The inspection light shown in the figure is obtained by setting the diffusion angle α1 of the first diffusion plate 12 to 5 ° and the diffusion angle α2 of the second diffusion plate 14 to 10 °.
As shown in FIG. 4A, it can be seen that a decrease in the amount of light at the edge (indicated by arrow A in the figure) in the cross section of the light beam is relatively suppressed. Further, as shown in FIG. 4B, the first diffusion plate 12 and the second diffusion plate 14 allow the diffusion angle θ obtained in the above (1) = a diffusion angle close to about 11 ° (about 13.5 °). ) Is given to the inspection light.
It should be noted that the diffusion angles α1 and α2 of the first diffusion plate 12 and the second diffusion plate 14 shown in the figure are merely examples, and as long as the above expressions (1) to (3) are satisfied, appropriate combinations are possible. Can be selected.
Furthermore, in addition to the two diffusion plates of the first diffusion plate 12 and the second diffusion plate 14, another diffusion plate may be provided. On the contrary, the surface light source unit 10 emits a planar shape. In the case where there is no illuminance unevenness in the parallel light, only one diffusion plate may be used.

Next, the surface light source unit 10 will be described in detail.
5A and 5B are diagrams showing a configuration of the surface light source unit 10, in which FIG. 5A is a perspective view seen from the light emitting surface side, and FIG. 5B is a perspective view seen from the back side.
As described above, the surface light source unit 10 is a light source that emits planar parallel light to the housing 4, includes a bottomed cylindrical housing 30, and emits parallel light from an opening 31 at the upper end. That is, as shown in FIG. 3, the surface light source unit 10 includes a plurality of LEDs 20 as an example of a light emitting element, a circular reflection mirror 22 in which a concave reflection surface 21 is provided for each LED 20, and these LEDs 20. 5A, the reflecting mirror 22 is housed in an exposed state in the opening 31 of the housing 30. As shown in FIG. Further, a power switch 50, a power connector 51, and a dimming volume 52 are provided on the back surface of the surface light source unit 10.

FIG. 6 is a perspective view showing a state where the reflecting mirror 22 is removed in FIG.
As shown in the figure, the substrate 24 has a substantially circular shape in plan view with a slightly smaller diameter than the housing 30, and a plurality of LEDs 20 are formed on the surface of the substrate 24 at substantially equal intervals from the center of the substrate 24 to the edge. It is arranged in a wide range.
Further, as shown in FIG. 5A, each concave reflecting surface 21 of the reflecting mirror 22 forms a paraboloid of revolution, and the LED 20 is disposed at the bottom of the concave reflecting surface 21, and the emitted light of the LED 20 is concavely reflected. The light is collimated by the surface 21, and the light beam cross section is emitted as circular parallel light.
Each optical axis L (FIG. 3) of the concave reflecting surface 21 is parallel to the central axis K of the housing 4 and the opening at the tip of the concave reflecting surface 21 is adjacent as shown in FIG. 5 (A). It is arranged to overlap each other. Thereby, the edge part of the parallel light radiated | emitted from each of the concave reflective surfaces 21 overlaps, and planar parallel light with a large diameter as a whole is obtained.
A plurality of fixing holes 25 are provided at the edge of the reflecting mirror 22, and a support column 17 (FIG. 3) supporting the second diffusion plate 14 is inserted into and fixed to each fixing hole 25. The diffusion plate 14 is disposed in the vicinity of the opening at the tip of the concave reflecting surface 21.

  By the way, in this surface light source unit 10, as described above, since a large number of LEDs 20 are widely scattered on the surface of the substrate 24, the LEDs 20 generate heat in a wide range of the substrate 24, and The amount of heat generation increases in proportion to the number of LEDs 20. In the surface light source unit 10 of this embodiment, all these LEDs 20 and the board | substrate 24 can be cooled efficiently, and this structure is explained in full detail below.

FIG. 7 is an exploded perspective view of the built-in unit 40 of the surface light source unit 10 as viewed from above, and FIG. 8 is an exploded perspective view as viewed from below. FIG. 9 is a perspective view of the built-in unit 40 as viewed from below. In these figures, the reflection mirror 22 is not shown.
As shown in these drawings, the surface light source unit 10 includes a substrate 24, a mounting plate 41, a plate member 42, an air path forming body 43, and a suction fan as a built-in unit 40 built in the housing 30. 44 and an electric circuit board 45 for lighting the LED 20 are integrally provided.
The mounting plate 41 is a circular plate member made of a high thermal conductivity material such as aluminum, for example, in a plan view. The substrate 24 is mounted on the surface 41 </ b> A side, and functions as a heat sink that receives the heat of the substrate 24. The mounting plate 41 is formed to have substantially the same diameter as the inner diameter of the housing 30, and is fitted so that there is no gap between the inner peripheral surface of the housing 30 as shown in FIG. 6. Thereby, the housing | casing 30 is partitioned off by the mounting plate 41, and the distribution | circulation of the air between the surface 41A side and the back surface 41B (FIG. 8) side of the mounting plate 41 is interrupted | blocked.

The plate member 42 is a plate-like member that is spaced apart from the back surface 41B side of the mounting plate 41 and has a circular shape in plan view. Like the mounting plate 41, the plate member 42 is formed of a high thermal conductive material such as aluminum. Yes. The plate material 42 is used as an attachment body for the electric circuit board 45, and three electric circuit boards 45 are assembled on the back surface 41 </ b> B side of the plate material 42.
These electric circuit boards 45 include a switch board on which a power switch circuit is mounted, a power board on which a power circuit is mounted, and a dimming circuit board on which a dimming volume circuit is mounted. The power switch circuit is a circuit that supplies / stops external power to the power circuit in accordance with the on / off operation of the power switch 50. The power circuit is a circuit that converts external power input through the power connector 51 to generate lighting power for the LEDs 20 and supplies the generated power to the LEDs 20. The dimming volume circuit is a circuit that changes the light output of the LED 20 by changing the power supplied from the power supply circuit to the LED 20 according to the operation amount of the dimming volume 52.
These electric circuit boards 45 are attached to a mounting base 46 formed by bending a high heat conductive plate material such as aluminum into an L shape, and each mounting base 46 is assembled and fixed to the back side of the plate material 42.

  The air path forming body 43 extends from the central portion 60 of the back surface 41B of the mounting plate 41 to the outer peripheral portion 61 in a space 48 (see FIG. 9) between the mounting plate 41 and the plate material 42 as shown in FIG. A large number of air passages 62 are formed around the central portion 60. Specifically, the air passage forming body 43 includes a plurality of plate-like wall members 63 extending from the central portion 60 of the mounting plate 41 to the outer peripheral portion 61, and these wall members 63 are used as the back surface 41 </ b> B of the mounting plate 41. The air passage 62 is formed around the central portion 60 at substantially equal intervals so as to join the central portion 60 to each other. Each wall member 63 has a curved shape in plan view so as to reach an outer peripheral portion 61 by drawing an arc from the central portion 60, and from the central portion 60 of the air passage 62 compared to the case where the wall member 63 is linear. The length of the air path reaching the outer peripheral portion 61 is long.

As shown in FIG. 6, the outer peripheral surface 30 </ b> A of the housing 30 is provided with a large number of ventilation holes 65 that connect each air passage 62 of the air passage formation body 43 and the outside of the housing 30 to circulate air. ing.
Further, the wall members 63 of the air passage forming body 43 are also in close contact with the plate member 42 so that they are thermally coupled. In the surface of the plate member 42, as shown in FIG. 7, a suction port 66 is opened immediately below a central portion 60 where the air passages 62 join, and a suction fan 44 is attached to the suction port 66. The suction fan 44 covers the suction port 66 with the suction surface 44A (FIG. 7), and is provided with the discharge surface 44B exposed on the back surface of the housing 30 as shown in FIG.
When the suction fan 44 performs the suction operation, the cooling air is taken into the air passages 62 from the ventilation holes 65 of the housing 30, and the mounting plate 41, the plate member 42, and the wall member 63 that seal the air passage 62 are removed. As it cools, it gathers at the central portion 60, is sucked out from the suction port 66, and is discharged from the back surface of the housing 30 to the outside.

As a result, the entire surface of the mounting plate 41 from the central portion 60 to the outer peripheral portion 61 is evenly cooled, so that each of the substrate 24 and the large number of LEDs 20 mounted on the mounting plate 41 is efficient, and Cool evenly.
Further, since the plate member 42 is cooled together with the mounting plate 41, various electric circuit boards 45 assembled to the plate member 42 can also be cooled.

Furthermore, since the housing 30 is partitioned by the mounting plate 41 and air flow between the front surface 41A side and the back surface 41B side of the mounting plate 41 is blocked, the suction fan 44 is operated. During this time, air does not collect on the mounting surface side of the LED 20, and adhesion of dust, dust or the like to the LED 20 or the substrate 24 can be suppressed.
In addition, it is necessary to connect the wiring extended from the electric circuit board | substrate 45 assembled | attached to the board | plate material 42 to the board | substrate 24. FIG. For this reason, a plurality of wiring openings 67 for wiring are formed at positions near the edge of the mounting plate 41 and covered with the substrate 24, as shown in FIG. Correspondingly, holes 68 (FIG. 9) for wiring drawing are formed in the substrate 24, and the wirings are connected to the circuit pattern on the surface of the substrate 24 through the wiring openings 67 and the holes 58. Each hole 58 is sized so that the gap is filled with wiring. Therefore, since the wiring opening 64 is blocked by the substrate 24 on the surface 41A side of the mounting plate 41, air flows between the front surface 41A and the back surface 41B through the wiring opening 64 and the hole 58. Is suppressed.

  On the other hand, the plate member 42 has a slightly smaller diameter than the inner diameter of the housing 30 and creates a slight gap with the inner peripheral surface of the housing 30, and air is introduced into the space on the back side of the plate member 42 through this gap. By distributing the heat, it is possible to prevent heat from being stored in the space on the back surface side of the plate member 42 due to heat generated by the electric circuit board 45.

As described above, according to the present embodiment, the diffusion angle θ within the range of the incident angle β defined by the numerical aperture NA of the bundle fiber 9 is applied to the planar parallel light emitted by the surface light source unit 10. The first diffusion plate 12 and the second diffusion plate 14 are used.
With this configuration, even when the incident end face of the bundle fiber 9 is wide, the entire incident end face of the bundle fiber 9 can be irradiated with light by using planar parallel light according to the width. In addition to this, light having an incident angle β (diffusion angle θ) that is efficiently incident on the bundle fiber 9 is simply passed through the first diffusion plate 12 and the second diffusion plate 14 through the plane-shaped parallel light. Thus, the optical system of the apparatus is simple and the apparatus can be made compact.

In addition, according to the present embodiment, the first diffusing plate 12 is disposed closer to the surface light source unit 10 than the exit port 5, and uneven illuminance generated in the parallel light due to the light emission of the plurality of LEDs 20 is generated in the exit port 5. It was set as the structure suppressed to all.
Thereby, even when a light source is comprised by several LED20, the inspection light which suppressed the illumination intensity nonuniformity by each light spot is obtained.
Furthermore, since only the light of a predetermined wavelength range can be radiated | emitted by using LED20, it is not necessary to provide a wavelength selection filter compared with the case where a lamp is used.

  In addition, according to the present embodiment, since the second diffuser plate 14 is provided at the emission port 5, the amount of light is reduced at the edge of the cross section of the light beam due to incidence on the inner peripheral surface 4A of the housing 4, and uneven illuminance occurs. However, since it is diffused by the second diffusing plate 14 when radiated from the emission port 5, inspection light with reduced illuminance unevenness can be obtained.

  Further, according to the present embodiment, the plurality of air paths 62 provided on the back surface 41 </ b> B side of the mounting plate 41 by the air path forming body 43 reach the outer peripheral portion 61 from the central portion 60 of the mounting plate 41. Since the entire surface is cooled, the substrate 24 and the LED 20 can be efficiently cooled through the mounting plate 41.

  Further, according to the present embodiment, the housing 30 is partitioned by the mounting plate 41 and the air flow between the front surface 41A side and the back surface 41B side of the mounting plate 41 is blocked, so that the suction fan Air is not collected on the mounting surface side of the LED 20 while the LED 44 is operated, and adhesion of dust, dust, or the like to the LED 20 or the substrate 24 can be suppressed.

  According to this embodiment, since the electric circuit board 45 mounted with various electric circuits for lighting the LEDs 20 is attached to the plate material 42 made of a high thermal conductivity material, these electric circuit boards 45 are also combined with the board 24 and the LEDs 20. Can be cooled.

  The above-described embodiment is merely an example of one aspect of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.

  For example, although LED20 was illustrated as an example of a light emitting element in embodiment mentioned above, it is not restricted to this, Arbitrary light emitting elements, such as an organic EL element, can be used.

Further, in the surface light source unit 10, the configuration in which the cooling fan is sucked out from each of the air passages 62 using the suction fan 44 and exhausted from the back surface of the housing 30 is illustrated, but the present invention is not limited thereto, and the back surface of the housing 30 and the like. Alternatively, the cooling air sucked from the air passage 62 may be blown into the central portion 60 where the air passages 62 gather to flow the cooling air through each of the air passages 62.
The light emitted by the surface light source unit 10 is not limited to planar parallel light. That is, in the surface light source unit 10, the number and arrangement of the LEDs 20 on the substrate 24, the presence / absence of the reflecting mirror 22, or the light distribution characteristics by the reflecting mirror 22 are arbitrarily changed according to the required illumination light. Also good.

Further, the surface light source unit 10 is not limited to a mode of being used by being incorporated in the light guide light source device 1 or the like, and can be used alone as a light source for various illuminations.
Application examples of the lighting fixture using the surface light source unit 10 include a ceiling or underground embedded lighting fixture and a spot type lighting fixture. These lighting fixtures are described in detail below.

  FIG. 10 is a schematic diagram of a ceiling-embedded lighting fixture 100 configured using the surface light source unit 10. The ceiling-embedded lighting fixture 100 has a configuration provided in the surface light source unit 10 unless otherwise specified. In FIG. 10, some members are appropriately omitted and illustrated, and members already described in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The ceiling-embedded lighting device 100 is a device that is housed and fixed in the ceiling of a building and illuminates the room. As shown in FIG. 10, the ceiling-mounted illumination fixture 100 has substantially the same configuration as that of the surface light source unit 10, and the housing 130 is suspended and fixed in the ceiling by the suspension bolts 182. An opening 131 serving as an emission port is exposed from a mounting hole 181 provided in the ceiling surface 180, and emitted light of each LED 20 is irradiated from the opening 131 into the room. The light distribution of the ceiling-mounted illumination fixture 100 can be any light distribution by changing the shape of the concave reflecting surface 21 of the reflecting mirror 22.

  In this ceiling-embedded lighting fixture 100, the configuration of a mounting plate (not shown) included in the built-in unit 140 of the housing 130 is significantly different from that of the surface light source unit 10, and this mounting plate It is formed in a size that forms a gap 170 serving as an air passage between itself and the peripheral surface. Thus, along with the suction operation of the suction fan 44, outside air is taken as cooling air from the opening 131 exposed in the room through the gap 170 into the back side of the mounting plate and introduced into the air path formation body 43, and the substrate 24 and the electric The circuit board 45 is cooled and discharged from the discharge surface 44B of the suction fan 44 exposed on the back surface of the housing 130.

  FIG. 11 is a schematic diagram of a spot type lighting fixture 200 configured using the surface light source unit 10. In addition, this spot type lighting fixture 200 has the structure with which the surface light source unit 10 is provided unless there is particular description below. In FIG. 11, some members are appropriately omitted and illustrated, and members already described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

The spot-type lighting fixture 200 is a fixture that is attached to the ceiling or wall surface of a building and spot-illuminates the room. As shown in FIG. 11, the spot type lighting apparatus 200 includes a spot light source unit 210 and a support 285.
The spot light source unit 210 has substantially the same configuration as the surface light source unit 10. However, in order to make the light distribution of the irradiated light a spot light distribution, the concave reflecting surface 221 of the reflecting mirror 222 has a shape suitable for the spot light distribution, and the opening 231 of the housing 230 is covered with a Fresnel lens 271. .
The support 285 is slidably attached along a rail (not shown) called a lighting rail, a wiring duct rail, or the like provided at an installation location of the spot type lighting fixture 200, and the spot light source via the support column 287. The unit 210 is supported.
In the spot light source unit 210 of the spot type lighting fixture 200, the direction of the cooling air is greatly different from that of the surface light source unit 10. That is, the built-in unit 240 of the spot light source unit 210 includes a suction fan 244 instead of the suction fan 44. Thereby, along with the suction operation of the suction fan 244, outside air is taken in as cooling air from the suction surface 244A of the suction fan 244 exposed on the back surface of the housing 230, and blown into the air passage formation body 43, and the substrate 24 and the electric The circuit board 45 is cooled and discharged from the outer peripheral surface of the housing 230.

DESCRIPTION OF SYMBOLS 1 Light guide light source device 2 Apparatus main body 9 Bundle fiber (light guide)
10 Surface light source unit (light source unit)
20 LED (light emitting device)
22, 222 Reflecting mirror 24 Substrate 30, 130, 230 Housing 41 Mounting plate 42 Plate material 43 Air channel formation body 44 Suction fan (fan)
45 Electric circuit board 60 Central part 61 Outer part 62 Air passage 63 Wall material 65 Ventilation hole 100 Ceiling embedded lighting fixture 170 Gap 200 Spot type lighting fixture 210 Spot light source unit 244 Suction fan (fan)
K Center axis L Optical axis

Claims (3)

In a light source unit comprising a light emitting element and a substrate on which the light emitting element is mounted,
A plate-like mounting plate made of a high thermal conductivity material for mounting the substrate on the surface side;
A plate material that is spaced apart from the back side of the mounting plate, and
An air passage forming body that forms a plurality of air passages extending from the center portion of the mounting plate to the outer peripheral portion between the mounting plate and the plate material,
A fan that blows or sucks cooling air from the opening provided in the plate material and sucks the air into each of the air passages, and
A light source unit comprising: With a housing,
2. The light source unit according to claim 1, wherein the housing is partitioned by the mounting plate to block air flow between the front surface side and the back surface side of the mounting plate. An electric circuit for lighting the light emitting element;
Forming the plate from a highly thermally conductive material;
The light source unit according to claim 1, wherein the electric circuit is attached to the plate member.