JP2016164871A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device having improved light distribution, and having high peak illuminance.SOLUTION: A light-emitting device 10 includes: an installation base 60 that has a first plane part 61 and a second plane part 62 inclined adjacent to the first plane part 61; a linear light source part 20 that has a light-emitting element 30 installed on the second plane part 62; and reflection part 40 that includes a reflection surface 50 extending in an extension direction of the linear light source 20, and having a first reflection surface 51 and a second reflection surface 52 arranged on the side closer to the installation base 60 than the first reflection surface 51. The first reflection surface 51 reflects light from the light source 20 in an irradiation direction parallel with the first plane part 61, and the second reflection surface 62 reflects light from the light source 20 toward the first reflection surface 51.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light emitting device.

  In general, a light emitting device using a light emitting element such as a light emitting diode (LED) as a light source is used in various fields, and has been proposed as a light source for automobiles (for example, Patent Documents 1 and 2). reference). The light-emitting device includes a light source unit and a reflecting mirror provided with the light source unit as a focal point, and is configured to be detachable so that the light source unit is unitized and the position can be adjusted with respect to the reflecting mirror. (For example, refer to Patent Document 1). Further, even in an offset printing machine that cures ink by irradiating ultraviolet rays from a light source unit, an ultraviolet light emitting device including a light source unit and a reflecting mirror is used.

  The conventional ultraviolet light emitting device described above uses a cylindrical reflecting mirror whose reflecting surface is a paraboloid in order to irradiate the printed matter with ultraviolet rays, and irradiates ultraviolet rays from the light source unit installed at the focal position of the cylindrical reflecting mirror. Then, the ink of the printed material is configured to be cured.

JP 2013-246943 A JP 2006-147399 A

  However, in the conventional light emitting device, it is necessary to take a configuration in which the distance between the irradiation object and the light source unit is increased in the printing installation environment, and thus it takes time to cure the ink irradiated with ultraviolet rays. In addition, part of the light emitted from the light emitting element is not reflected by the reflecting surface and is emitted out of the light emitting device without becoming parallel light, thereby deteriorating the light distribution of the light emitting device.

  In the conventional light-emitting device, light that does not hit the reflecting surface diverges from an opening at the tip of the device on the light irradiation side. For this reason, the conventional light emitting device not only has a poor light distribution, but also reduces the amount of light that strikes the irradiated surface, and does not provide the necessary amount of light. For example, the curing efficiency is poor. In addition, the light emitted from the opening at the tip is irradiated to an unnecessary portion, which may cause clogging of a nozzle that supplies ink that is cured by ultraviolet irradiation, for example.

  An embodiment of the present invention has been made in view of the above points, and an object thereof is to provide a light emitting device with improved light distribution and high peak illuminance.

  In order to solve the above-described problem, a light emitting device according to an embodiment of the present invention includes a first flat part, a second flat part that is inclined and adjacent to the first flat part, and the first flat part. A linear light source unit having light emitting elements, which is installed in two plane parts, and extends in the extending direction of the linear light source unit, and is closer to the installation base than the first reflective surface and the first reflective surface A reflecting portion having a reflecting surface having a second reflecting surface disposed on the first reflecting surface, wherein the first reflecting surface emits light from the light source unit in a direction parallel to the first flat surface portion. The second reflection surface is configured to reflect light from the light source unit toward the first reflection surface.

  According to the light emitting device according to the embodiment of the present invention, by using the first reflection surface and the second reflection surface, useless light that is not reflected by the reflection surface is reduced, light distribution is improved, and peak illuminance is increased. be able to.

It is sectional drawing which shows typically the light-emitting device which concerns on 1st Embodiment. 1 is an exploded perspective view schematically showing a light emitting device according to a first embodiment. 1 is a perspective view schematically showing a light emitting device according to a first embodiment. It is a disassembled perspective view which shows typically the light-emitting device which concerns on 2nd Embodiment. It is sectional drawing which shows typically the usage example which has arrange | positioned the several light-emitting device. It is a perspective view which expands and typically shows the light source part of the light-emitting device which concerns on 3rd Embodiment. FIG. 10 is a perspective view schematically showing a configuration of a reflecting portion with a part cut away, of a light emitting device according to a third embodiment. It is sectional drawing which shows typically the light-emitting device which concerns on 3rd Embodiment. It is a top view which shows typically the light-emitting device which concerns on 3rd Embodiment.

Hereinafter, a light-emitting device showing an example of an embodiment according to the present invention will be described. The drawings referred to in the following description schematically show the present embodiment, and the scale, spacing, positional relationship, etc. of each member are exaggerated, or some of the members are not shown. There may be.
Moreover, in the following description, the same name and code | symbol indicate the same or the same member in principle, and shall omit detailed description suitably.

(First embodiment)
Hereinafter, an example of the light emitting device according to the first embodiment of the present invention will be described as an ultraviolet irradiation device that cures ink or the like. As shown in FIGS. 1 to 3, the light emitting device 10 according to the present embodiment mainly includes a light source unit 20, a reflection unit 40, and an installation table 60. As shown in FIG. 3, in the light emitting device 10, the reflection unit 40 and the installation table 60 are connected on the side opposite to the light irradiation direction side, and the reflection unit 40 and the installation table 60 are separated on the light irradiation direction side. It has the opening 11 comprised by these. The light emitting device 10 emits light (ultraviolet light) in a horizontal direction toward a target irradiation surface separated by a predetermined distance (for example, 10 mm or more).
Hereinafter, in some cases, the extending direction of the linear light source unit 20 is defined as the X direction, the light irradiation direction of the light emitting device 10 is defined as the Y direction, and the direction in which the light emitting device 10 is mounted on an external support member is defined as the Z direction. To do.

The light source unit 20 of the present embodiment includes a plurality of light emitting elements 30 arranged in a straight line as shown in FIG. As described above, the light source unit 20 having the desired length and size can be obtained by arranging a plurality of light emitting elements 30 in a line. In this specification, the term “linear” is not limited to being strictly a straight line, but also includes a slight bend.
More specifically, in the light source unit 20 of the present embodiment, four light emitting elements 30 are linearly mounted on one substrate 31, and eight substrates 31 on which four light emitting elements 30 configured in the same manner are mounted. They are arranged in a straight line. Positive and negative conductive patterns (electrodes) are arranged on the upper surface of each substrate 31, and power is supplied to the light emitting element 30 through the conductive patterns.
The shape, size, and the like of the light emitting element 30 used as the light source unit are not particularly limited, but in the present embodiment, as an example, the shape of the light emitting element 30 is a rectangular parallelepiped (die shape).
The emission wavelength of the light emitting element 30 can be arbitrarily selected according to the application. For example, in the case of a light-emitting device having a phosphor, the light-emitting element 30 is a nitride semiconductor (In _X Al _Y Ga _1-XY N, 0 ≦ X, Preferred examples include 0 ≦ Y and X + Y ≦ 1).
In addition, it is possible to emit white mixed color light suitably combined with a blue light emitting element, and typical phosphors used for the wavelength conversion member include, for example, YAG (Yttrium Aluminum Garnet), BOS (Barium ortho -Silicate) type phosphors are preferably used. In this embodiment, it is assumed that ultraviolet light is emitted.

The reflection unit 40 reflects light from the light source unit 20. The configuration of the reflection unit 40 can be appropriately set in terms of material, thickness, width, length, and the like according to use conditions of the light emitting device 10. The reflection unit 40 is preferably provided on the entire upper surface of the light source unit 20.
The reflection unit 40 may be a metal or a member in which a light reflective material such as a metal thin film is formed on the surface facing the light source unit 20. In the present embodiment, the reflecting portion 40 is fixed to the installation table 60 at the lower end of the reflecting portion 40 as shown in FIG. Specifically, a connecting portion 41 that is continuous with the lower end of the reflecting portion 40 is provided by being fixed to a mounting portion 63 of the installation base 60 and a predetermined connecting member such as a screw as will be described later.

As shown in FIGS. 2 and 3, the reflecting portion 40 of the present embodiment has a reflecting surface 50 on the side facing the light source portion 20, and is substantially uniform in the extending direction (X direction) of the light source portion 20. The cross-sectional shape is as follows.
The reflection surface 50 reflects light emitted from the light emitting element 30 of the light source unit 20 provided at the focal position in an irradiation direction (Y direction) that is a direction parallel to the first plane unit 61 of the installation table 60. In the present embodiment, since the reflecting portion 40 has a uniform cross-sectional shape in the X direction, the focal point of the reflecting surface 50 is formed linearly in the X direction.

The reflection surface 50 has a first reflection surface 51 and a second reflection surface 52.
The first reflection surface 51 is disposed on the light irradiation direction side of the reflection surface 50 and reflects incident light in the irradiation direction (Y direction). Specifically, the first reflecting surface 51 of the present embodiment has a shape that irradiates incident light perpendicularly (90 degrees) to the target irradiation surface. As for the 1st reflective surface 51 of this embodiment, the cross-sectional shape orthogonal to the extension direction (X direction) of the light source part 20 is a parabola, as shown in FIG. In addition, the 1st reflective surface 51 of this embodiment has the same shape along the extension direction (X direction) of the light source part 20. FIG.

  The second reflective surface 52 is disposed on the side (installation surface side) close to the installation base of the reflective surface 50, and reflects the light from the light source unit 20 toward the first reflective surface 51. The second reflecting surface 52 is smaller than the narrow angle θ (the same angle as the mounting surface of the light emitting element 30) of the extension lines (virtual lines) V2 and V3 in FIG. 1 when the reflected light is measured from the Z axis. It has a shape that irradiates the end of the first reflecting surface 51 on the tip side at an angle (an angle at which light strikes the first reflecting surface 51). As shown in FIG. 1, the second reflecting surface 52 has a parabolic shape in a cross-sectional shape orthogonal to the extending direction (X direction) of the light source unit 20. The parabola that forms the second reflecting surface 52 and the parabola that forms the first reflecting surface 51 have different curvatures. The second reflecting surface 52 has the same shape along the extending direction (X direction) of the light source unit 20.

  The installation base 60 is for installing the light source unit 20, and the light source unit 20 is installed at the focal point of the reflection unit 40. In the present embodiment, the first reflecting surface 51 and the second reflecting surface 52 are in the cross section orthogonal to the extending direction (X direction) of the light source unit 20 and the focal point of the first reflecting surface 51 and the second reflecting surface 52. The focus is in agreement.

  A material, thickness, width, length, and the like of the installation base 60 are determined according to usage conditions of the light emitting device 10. The installation base 60 is preferably made of a material having high thermal conductivity such as metal (for example, copper, aluminum), ceramics including aluminum nitride, and carbon. Thereby, the installation stand 60 can efficiently radiate the heat generated by the light source unit 20.

  The installation table 60 may be provided with a cooling means in order to enhance the heat radiation function. In the example shown in FIG. 1, the installation table 60 includes a water channel 66 inside. Note that other liquid or gas such as air may be circulated instead of water. Further, the installation table 60 may be provided with fins.

As shown in FIG. 2, the installation base 60 of the present embodiment includes a first plane portion 61, a second plane portion 62, and an attachment portion 63.
Here, the first plane portion 61 is formed to be parallel to the normal direction (Y direction) of the target irradiation surface. The first plane portion 61 is formed above the second plane portion 62 and the attachment portion 63. As shown in FIG. 1, the first reflecting surface 51 and the second reflecting surface 52 are separated on the extension line V <b> 1 of the first plane portion 61.

  The second flat surface portion 62 is an inclined surface that is adjacent to the first flat surface portion 61 and is inclined so as to be disposed in the vicinity of the second reflecting surface 52. The light source unit 20 is installed on the second plane unit 62. Thereby, the mounting surface of the light emitting element 30 is inclined with respect to the irradiation direction.

  Specifically, the second flat portion 62 is inclined so that all of the light emitted from the side surface close to the opening 11 when hitting the light emitting element 30 strikes the first reflecting surface 51 (point P1: FIG. 1). FIG. 1 is a schematic diagram, and it is assumed that the light emitting element 30 is arranged at the position of the point P0.

The 2nd plane part 62 of this embodiment inclines in the angle range smaller than 45 degree | times with respect to an irradiation direction, for example. In other words, when represented by the angle θ of FIG. 1 when measured from the Z-axis (the same angle as the mounting surface of the light emitting element 30), the inclination angle θ of the second planar portion 62 is, for example, larger than 45 degrees. Is formed.
The inclination of the second plane part 62 may be formed so as to be greater than 0 degree with respect to the irradiation direction, but the length of the reflection part 40 is shortened by increasing the inclination of the second plane part 62. In addition, the size of the light emitting device 10 can be reduced. For example, the inclination can be about 20 to 55 degrees with respect to the irradiation direction.
The second plane portion 62 is formed continuously with the first plane portion 61. At this time, the first plane portion 61 has an angle of 90 degrees when measured from the Z axis. It will be.

Here, the arrangement of the first reflecting surface 51 and the second reflecting surface 52, and the first flat surface portion 61 and the second flat surface portion 62 will be described in detail with reference to FIG.
As shown in FIG. 1, the second reflecting surface 52 is formed from a point E2 at a predetermined position of the second plane part 62 to a point P2 at a predetermined position on the extension line V1 of the first plane part 61 in the reflecting surface 50. Has been. Further, the first reflecting surface 51 is formed such that one end is continuous with the second reflecting surface 52 at the point P2 and the other end is located on the tip side of the point P1 at a predetermined position on the extension line V2 of the second plane portion 62. A position point E1 is formed.

In other words, in the present embodiment, as shown in a cross-sectional view in FIG. 1, the point E1 at the end of the first reflecting surface 51 on the light irradiation direction side (front end side) is on the extension line V2 of the second plane portion 62. It is formed up to a position longer than the position of the point P1. That is, the point E1 is disposed at a position farther from the point P2 than the position (point P1) where the plane extending from the second plane portion 62 and the first reflecting surface 51 intersect. In addition, the point P is arrange | positioned in the position where the plane which extended the 1st plane part 61, and the 1st reflective surface 51 cross | intersect.
Further, the other end (the installation surface side of the reflection surface) of the first reflection surface 51 is formed at the position of a point P2 on the extension line V1 of the first plane portion 61. In this way, by forming the point E1 at the end of the first reflecting surface 51 on the light irradiation direction side (tip side) to a position longer than the position of the point P1 on the extension line V2 of the second flat surface portion 62, The light emitted from the light emitting element 30 can be completely reflected by the reflecting surface 50, and the irradiation direction can be controlled.
Further, the end of the second reflecting surface 52 on the light irradiation direction side (tip side) is formed at the position of the point P2 on the extension line V1 of the first flat surface portion 61. Further, the other end of the second reflection surface 52 (on the installation surface side of the reflection surface) is formed up to a point E <b> 2 at the position of the second plane portion 62 on the opposite side to the first reflection surface 51.
In the present embodiment, the first reflecting surface 51 and the second reflecting surface 52 are formed of the same material by curving a metal plate or the like.

Next, the operation of the light emitting device 10 of the first embodiment will be described with reference to FIG.
The light emitting device 10 reflects a part of light (for example, the optical paths L1 and L2) from the light emitting element 30 located at the point P0 which is the focal point of the reflecting surface 50 by the first reflecting surface 51 in the horizontal direction. In addition, since the mounting surface of the light emitting element 30 is inclined in the light emitting device 10, another part of light (for example, the optical path L <b> 3) from the light emitting element 30 positioned at the focal point of the reflecting surface 50 is transmitted to the second reflecting surface 52. Is reflected by the first reflection surface 51, reflected by the first reflection surface 51, and emitted to the opening 11 side. As described above, the light emitting device 10 distributes a desired light distribution by directly or indirectly hitting the first reflecting surface 51 with all light emitted from an angle range of 180 degrees including both side surfaces with the upper surface of the light emitting element 30 as the center. Can be obtained.

  Here, the optical path L3 shown in FIG. 1 is a critical optical path when the light that indirectly reaches the first reflecting surface 51 from the light emitting element 30 via the second reflecting surface 52 deviates from the irradiation direction. The optical path reflected by the 2nd reflective surface 52 at the highest angle seeing from the element 30 is represented. On the other hand, when the light is reflected by the second reflecting surface 52 at a low angle as viewed from the light emitting element 30, the optical path indirectly leading from the light emitting element 30 to the first reflecting surface 51 is critically close to the extension line V2. Become. As a result, light indirectly reaching the first reflecting surface 51 from the light emitting element 30 is not substantially deviated from the point E1 at the end of the first reflecting surface 51. In addition, the light indirectly reflected from the second reflecting surface 52 and then indirectly reaching the first reflecting surface 51 slightly deviates from the point E1 at the end of the first reflecting surface 51, but the angle range α diffused here is Measured at a predetermined distance D from the point P1 in the irradiation direction, for example, is about 3 degrees. As described above, in the light emitting device 10, light can be efficiently applied to the external irradiation surface as compared with the conventional light emitting device, and the amount of light hitting the irradiation surface can be increased.

As described above, according to the light emitting device 10, it is possible to significantly reduce the light that does not hit the reflecting surface 50, improve the light distribution, and increase the peak illuminance of the light.
The light emitting device 10 is particularly suitable when the distance between the light source and the printed material is long, such as an offset printing machine using ink that is cured by ultraviolet irradiation. Further, according to the light emitting device 10, the light emission can be concentrated only in a narrow range such as a long and narrow irradiation surface. It is also effective when there is. Specifically, for example, the portion of the printing paper surface where the ink is sprayed is a portion where it is desired to apply ultraviolet light, while the inkjet nozzle (ink discharge port) provided near the printing paper surface emits ultraviolet light. This is the part you don't want to hit The reason is that if ultraviolet light hits a nozzle that supplies ink, the ink is cured in the vicinity of the nozzle portion, which may cause clogging of the nozzle.

  The connection method of the installation base 60 and the reflection part 40 is not specifically limited. In this embodiment, as shown in FIG. 2, the mounting portion 63 of the installation base 60 is adjacent to the second flat surface portion 62 and is fixed by a connecting portion 41 of the reflecting portion 40 and a predetermined connecting member such as a screw. Is provided. Specifically, as shown in FIG. 2, screw holes 64 and 65 that are through holes are formed in the attachment portion 63. Further, as shown in FIG. 2, screw holes 42 and 43 that are through holes are formed in the connecting portion 41 of the reflecting portion 40. Accordingly, the screws 71 and 72 are screwed into the screw holes 64 and 65 of the mounting portion 63 and the screw holes 42 and 43 of the connecting portion 41, so that the reflecting portion 40 is fixed to the installation base 60.

(Second Embodiment)
The light emitting device 10A shown in FIG. 4 is different from the light emitting device 10 shown in FIG. 2 in that a plurality of light emitting elements 30 are arranged in two rows in the light source unit 20A. Therefore, the same components as those of the light emitting device 10 shown in FIG.
The light source unit 20 </ b> A includes a first light source unit 21 and a second light source unit 22.
The first light source unit 21 is configured by arranging a plurality of light emitting elements 30 in a straight line in the X direction.
The second light source unit 22 includes a plurality of light emitting elements 30 arranged linearly in parallel with the first light source unit 21. The second light source unit 22 is disposed close to the first light source unit 21.
More specifically, in each of the first light source unit 21 and the second light source unit 22, four light emitting elements 30 are mounted linearly on one substrate 31, and four light emitting elements 30 configured similarly are mounted. The eight substrates 31 are arranged in a line in a straight line.
The light emitting device 10 </ b> A has the center position of the first light source unit 21 and the second light source unit 22 as the focal point of the reflection surface 50. According to the light emitting device 10A, since the number of light emitting elements 30 to be mounted can be increased, the light output can be increased.

  The light emitting device according to the embodiment of the present invention has been described above, but the present invention is not limited to this. For example, in each said embodiment, although the cross-sectional shape orthogonal to the extension direction (X direction) of the light source part 20 was a parabola in the 1st reflective surface 51, it is not restricted to this, A straight line is followed along a parabola. It may be formed into a pseudo parabola formed continuously by changing the angle of or an elliptic curve.

  Further, in each of the above embodiments, the first reflecting surface 51 and the second reflecting surface 52 have a parabolic parabolic shape in the cross-sectional shape orthogonal to the X direction, and the reflecting surface 50 has a shape in which the reflected irradiation light becomes parallel light. However, the present invention is not limited to this, and it may have a shape in which the irradiation light becomes the condensed light. For example, if the cross-sectional shape orthogonal to the X direction of the reflecting surface is formed in an elliptic curve, the irradiation light reflected by the reflecting surface can be collected light.

  The reflector 40 has a substantially uniform cross-sectional shape, but may not be uniform depending on the shape of the irradiation range.

  Further, as shown in FIG. 3, the light emitting device 10 has not only the opening 11 in the irradiation direction (Y direction) but also both ends in the extending direction (X direction) of the light source unit 20 as opening ends. Therefore, a plurality of light emitting devices 10 may be used as one unit module, and a light emitting device in which the unit modules are arranged in a line in the extending direction (X direction) of the light source unit 20 may be formed. According to this, in an offset printing machine, it can be used as a general-purpose ultraviolet irradiation device corresponding to printed matter of various sizes. For example, when one unit module is configured as an apparatus having specifications suitable for A4 size printed matter under the condition that the printing direction is vertical, the same condition can be obtained by using two unit modules side by side in the X direction. A device with specifications suitable for A2 size printed materials at the same time, and similarly using four unit modules arranged in the X direction to realize a device with specifications suitable for A0 size printed materials under the same conditions Can do.

  Further, although the normal direction of the target irradiation surface is described as the irradiation direction (Y direction), the irradiation direction of the light emitting device 10 is not necessarily perpendicular to the target irradiation surface. You may make it irradiate from the diagonal with respect to an irradiation surface by changing a mounting direction.

  Further, as shown in FIG. 5, the light emitting device 10 may be formed as a unit module, and two or more light emitting devices arranged in the module mounting direction (Z direction) may be formed. For example, in an offset printing machine, as shown in FIG. 5, after the printing paper 90 is conveyed at a predetermined speed by the conveyance roller R <b> 1, the driven roller R <b> 2, and the ink is supplied from the nozzle (ink discharge port) 101 of the inkjet 100. Then, a case is assumed where ultraviolet rays are irradiated when passing through an elongated area A extending in a direction perpendicular to the paper surface of FIG. In this case, the openings of the two light emitting devices 10 may be mounted toward the area A. In general, the curing time (drying time) of the ink by ultraviolet rays depends on the distance from the light emitting device 10 to the irradiation surface and the amount of ultraviolet light, and the conveyance speed of the printing paper 90 is determined accordingly. As shown in FIG. 5, by increasing the amount of ultraviolet light by the two light emitting devices 10, the necessary curing time (drying time) can be reduced and the conveyance speed of the printing paper 90 or printed matter can be increased.

  Further, although the light emitting device has been described as an ultraviolet irradiation device, the light emitting element 30 may emit visible light or infrared light other than ultraviolet light. The use of the light emitting device is not limited to ultraviolet irradiation, but can be used for reading information, for an illumination device with increased light density, for in-vehicle use, and the like. When the application is for an illumination device or for in-vehicle use, for example, a light-emitting element that emits blue light is used as the light-emitting element 30, and a light-emitting device capable of emitting white light in combination with a wavelength conversion member can be used.

As an example of the light source unit used in a vehicle or the like, the light source unit 20B and the reflection unit 140 having configurations as illustrated in FIGS. 6 to 9 can be used. More specifically, the light source unit 20B includes a configuration in which four light emitting elements 130 are linearly mounted on one substrate 131, or a plurality of substrates 131 on which four light emitting elements 130 that are similarly configured are mounted. A configuration arranged in a straight line can be used. 6 to 9, in the light emitting device 10 </ b> B, the light source unit 20 </ b> B is illustrated as a configuration example in which one substrate 131 on which the four light emitting elements 130 are mounted is illustrated.
One light source unit 20 </ b> B includes four light emitting elements 30 on the substrate 131, a light transmissive member 132 provided on the upper surface of the light emitting element 30, and light that covers the side surfaces of the light emitting element 30 and the light transmissive member 132. And a reflective member 133.

  The translucent member 132 is a material that can transmit light emitted from the light emitting element 130 and emit the light to the outside. The light transmissive member 132 is a light diffusing material or fluorescent light that can convert at least a part of incident light. The body may be included. Specifically, for example, the phosphor powder mixed with a phosphor ingot such as a phosphor single crystal, polycrystal, or phosphor powder sintered body, resin, glass, inorganic, etc. is sintered. The thing which was done is mentioned. The thickness of the translucent member 132 is not particularly limited and can be changed as appropriate, and is, for example, about 50 to 300 μm.

Further, the light reflecting member 133 covers the side surfaces of the light emitting element 130 and the light transmitting member 132, reflects light from the light emitting element 130 into the light emitting element 130 or the light transmitting member 132, and transmits the light transmitting member. It has a role of emitting light to the outside through 132. The light reflective member 133 includes a reflective material in a base material made of a resin such as a silicone resin, a modified silicone resin, an epoxy resin, a modified epoxy resin, an acrylic resin, or a hybrid resin containing at least one of these resins. Can be formed. As a material of the reflective substance, an oxide containing any of Ti, Zr, Nb, Al, and Si, AlN, MgF, or the like can be used. Preferably, titanium oxide (TiO ₂ ) is used. Preferably, particles having a refractive index different from that of the base material are dispersed in the base material as the reflective material. Since the amount of light reflection and transmission varies depending on the concentration and density, the concentration and density may be adjusted as appropriate according to the shape and size of the light-emitting device.
Note that the substrate 131 may be configured to connect the Zener diode 135 together with the light emitting element 130 to the connection wiring 134. Further, the substrate 131 may have a configuration in which a through hole 136 that penetrates the substrate 131 from the connection wiring 134 is provided in order to improve the heat dissipation of the substrate 131.

  The installation table 160 is formed according to the shape of the reflection unit 140 in plan view. The installation table 160 includes a first plane part 161, a second plane part 162 that is formed continuously with the first plane part 161 and is inclined at a predetermined angle from the first plane part 161, the first plane part 161, and the first plane part 161. And a mounting portion 163 formed on the periphery of the two flat surface portion 162. A screw hole 164 is formed in the attachment portion 163. In addition, the installation stand 160 has a shape that becomes an outer contour line formed along a parabola in plan view.

  The reflection unit 140 includes a reflection surface 150 that is a paraboloid (a surface whose cross section is a parabola). The reflecting portion 140 includes a connecting portion 141 at the periphery, and a screw hole 143 is formed in the connecting portion 141. The reflection part 140 is detachably fixed via a connection member 173 such as a screw in a state where the connection part 141 faces a mounting part 163 formed on the periphery of the installation table 160. The reflection surface 150 has a first reflection surface 151 and a second reflection surface 152. The first reflecting surface 151 and the second reflecting surface 152 are paraboloids that coincide with each other as the same focal point at the position of the light source unit 20B serving as the pseudo point light source when the light source unit 20B is used as the pseudo point light source. Is formed.

  Therefore, the first reflecting surface 151 and the second reflecting surface 152 (reflecting surface 150) are parallel to the first flat surface portion 161 of the installation table 160 for the light emitted from the light emitting element 130 of the light source unit 20B provided at the focal position. Is reflected in the irradiation direction (Y direction), which is a simple direction. In the present embodiment, the reflecting portion 140 has a shape that becomes a paraboloid obtained by rotating the parabola by half. The focal point of the reflecting surface 150 is a point on the second plane portion 162. Therefore, the light source unit 20B is arranged as a pseudo point light source so that the positions of the center of gravity of the four light emitting elements 130 coincide with the focal position of the reflecting surface 150.

  In the light emitting device 10B configured as described above, by using it as an in-vehicle headlight, it is possible to irradiate as visible light having high irradiation intensity by a high beam or the like that needs to irradiate far away. .

  The light emitting device according to the embodiment of the present invention can be used for an ultraviolet irradiation device, an illumination device, an in-vehicle light emitting device, and the like.

10, 10A, 10B Light emitting device 11 Aperture 20, 20A, 20B Light source part 21 First light source part 22 Second light source part 30, 130 Light emitting element 31, 131 Substrate 40, 140 Reflecting part 41, 141 Connecting part 42, 43, 143 Through hole (screw hole)
50,150 Reflective surface 51,151 First reflective surface 52,152 Second reflective surface 60,160 Installation base 61,161 First flat surface portion 62,162 Second flat surface portion 63,163 Mounting portion 64,65 Through hole (screw Hole)
164 Screw hole 71, 72, 173 Connection member

Claims (10)

An installation table having a first plane part and a second plane part inclined and adjacent to the first plane part;
A linear light source unit having a light emitting element, installed on the second plane unit;
A reflection part that includes a reflection surface that extends in the extending direction of the linear light source unit, and includes a first reflection surface and a second reflection surface that is disposed closer to the installation base than the first reflection surface;
With
The first reflecting surface reflects light from the light source unit in an irradiation direction that is a direction parallel to the first plane unit, and the second reflecting surface reflects light from the light source unit to the first reflecting surface. Light-emitting device that reflects toward   The light source device according to claim 1, wherein the light source unit includes a plurality of light emitting elements arranged in a straight line.   3. The light emitting device according to claim 1, wherein the first reflection surface and the second reflection surface are divided on an extension line of the first plane portion.   4. The light emitting device according to claim 1, wherein each of the first reflecting surface and the second reflecting surface is formed by a parabola in a cross-sectional shape orthogonal to an extending direction of the light source unit.   2. The first reflective surface and the second reflective surface have a focal point of the first reflective surface and a focal point of the second reflective surface coincident with each other in a cross section orthogonal to the extending direction of the light source unit. The light emitting device according to claim 4.   The light emitting device according to any one of claims 1 to 5, wherein the light emitting element is a light emitting element that emits ultraviolet light. One end portion of the first reflecting surface is formed to a position longer than the extension line of the second plane portion, and the other end portion of the first reflection surface is formed on an extension line of the first plane portion. ,
One end portion of the second reflecting surface is formed on an extension line of the first flat surface portion, and the other end portion of the second reflecting surface is opposite to the first reflecting surface. The light-emitting device according to any one of claims 1 to 6, wherein the light-emitting device is formed up to a flat portion.   The said light source part is provided with the 1st light source part which has arrange | positioned several light emitting elements linearly, and the 2nd light source part which has arrange | positioned several light emitting elements linearly in parallel with the said 1st light source part. The light emitting device according to claim 5.   2. The first reflecting surface is formed as a pseudo-parabola formed continuously by changing the angle of a straight line along a parabola or an elliptic curve in a cross-sectional shape orthogonal to the extending direction of the light source unit. The light-emitting device according to claim 3.   The light emitting device according to any one of claims 1 to 9, wherein the reflecting surface is formed in a shape in which the reflected irradiation light becomes parallel light or condensed light. .

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