JP2017201676A - Light emitting device, light irradiation device including the light emitting device, and light emitting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device including a light-transmissive member having a plurality of cylindrical lens portions arranged parallel with each other, in which inclination of a light intensity distribution curve of the light emitting device in the parallel arrangement direction of the plurality of cylindrical lens portions changes gradually.SOLUTION: A light emitting device includes: a substrate 2; a plurality of light emitting elements 1 mounted on the substrate 2 to be formed in three or more light emitting element rows 6; and a light-transmissive member 3 where three or more rows of cylindrical lens portions 10 are arranged in parallel to each other so as to be disposed on the light emitting element rows 6, respectively. The light emitting element rows 6 are provided with substantially uniform intervals. The cylindrical lens portions 10 include, in the parallel direction, first cylindrical lens portions 11 including at least the rows at both ends, and a second cylindrical lens portions 12 provided at an inner side of the first cylindrical lens portions 11 and having a height greatest in the cylindrical lens portions 10.SELECTED DRAWING: Figure 3A

Description

  The present invention relates to a light emitting device, a light irradiation device including the light emitting device, and a light emitting unit.

  A COB (Chip On Board) type light emitting device using a light emitting diode (hereinafter also referred to as “LED”) as a light emitting element is known. For example, a plurality of light-emitting elements placed on a substrate and a translucent sealing member in which a plurality of semi-cylindrical cylindrical lenses are connected to each other on a light-emitting element array including a plurality of light-emitting elements A light-emitting device provided so that semicylindrical cylindrical lens portions are respectively disposed is known.

  Such a light emitting device, for example, is mounted with a light emitting element that emits light in the ultraviolet region (hereinafter sometimes referred to as ultraviolet light), and may be used as a light irradiation device for resin curing or printing. . In this type of light irradiation apparatus, it is generally considered that it is preferable to apply uniform strong ultraviolet light to an object to be irradiated such as ink or resin for curing.

JP 63-276287 A

  However, if the ink or resin is suddenly exposed to strong ultraviolet light as described above, only the surface of the ink or resin may be cured and the interior may not be sufficiently cured. For this reason, there is a demand for a light emitting device in which the slope of the light intensity distribution curve changes gently so that it is difficult for strong light to strike the irradiated object at once.

  In the embodiment of the present invention, in a light emitting device having a translucent member in which a plurality of cylindrical lens portions are arranged in parallel, the inclination of the light intensity distribution curve of the light emitting device in the parallel direction of the cylindrical lens portions is changed gently. With the goal. Moreover, it aims at providing the light irradiation apparatus which can change the intensity | strength of the light irradiated to a to-be-irradiated object gently.

  A light-emitting device according to an embodiment of the present invention is disposed on a substrate, a plurality of light-emitting elements mounted on the substrate and forming three or more light-emitting element arrays, and the light-emitting element arrays, respectively. Three or more rows of cylindrical lens portions arranged in parallel, and the light emitting element rows are provided at substantially equal intervals, and the plurality of cylindrical lens portions have at least both ends in the parallel direction. And a second cylindrical lens unit provided at an inner side than the first cylindrical lens unit and having the highest height among the plurality of cylindrical lens units.

  Moreover, the light emitting device according to the embodiment of the present invention includes a plurality of light emitting units arranged in parallel, and the light emitting unit is placed on the substrate and the plurality of light emitting units in the juxtaposition direction of the light emitting units. A plurality of light emitting elements forming a light emitting element array; and a translucent member in which a plurality of cylindrical lens portions are arranged in parallel so as to be disposed on the light emitting element array, respectively, and the cylindrical lens of the light emitting device The total number of the portions is three or more, and in the parallel direction, the cylindrical lens portion is provided at the inner side of the first cylindrical lens portion including at least the rows at both ends, and the plurality of the first cylindrical lens portions, A second cylindrical lens portion having the highest height in the cylindrical lens portion.

  A light irradiation apparatus according to an embodiment of the present invention is a light irradiation apparatus that includes a plurality of the light emitting devices and irradiates an irradiated object with light emitted from the plurality of light emitting devices, and the light emitting device includes the plurality of cylindrical devices. The lens units are arranged in the same direction as the parallel direction of the lens units, and the relative movement direction of the plurality of light emitting devices with respect to the irradiated object is the same as the parallel direction of the plurality of cylindrical lens units.

  A light emitting unit according to an embodiment of the present invention includes a substrate, a plurality of light emitting elements mounted on the substrate and forming a plurality of light emitting element arrays, and a plurality of light emitting units arranged on the light emitting element arrays, respectively. A plurality of cylindrical lens portions arranged in parallel, the light emitting element rows are provided at substantially equal intervals, and the plurality of cylindrical lens portions are different from the first cylindrical lens portion and the first cylindrical lens portion having different heights. Two cylindrical lens portions, and the second cylindrical lens portion has the highest height in the plurality of cylindrical lens portions and is provided at one end in the parallel direction of the plurality of cylindrical lens portions. Yes.

  According to the light emitting device having the above-described configuration, in the light emitting device having the translucent member in which a plurality of cylindrical lens portions are arranged in parallel, the slope of the light intensity distribution curve of the light emitting device in the parallel direction of the plurality of cylindrical lens portions is gradually changed. be able to. Moreover, according to the light irradiation apparatus having the above-described configuration, it is possible to gently change the intensity of light applied to the irradiation object.

FIG. 1 is a schematic perspective view showing the light emitting device according to the first embodiment. FIG. 2 is a schematic plan view showing an arrangement of a plurality of light emitting elements of the light emitting device shown in FIG. 3A is a schematic cross-sectional view taken along line IIIA-IIIA of the light emitting device shown in FIG. FIG. 3B shows a light intensity distribution curve of the light emitting device in the schematic cross-sectional view shown in FIG. 3A. 4 is a schematic cross-sectional view taken along line IV-IV of the light emitting device shown in FIG. 3A. FIG. 5 is a schematic cross-sectional view taken along line VV of the light-emitting device shown in FIG. 3A. FIG. 6 is a schematic cross-sectional view of the light emitting device according to the second embodiment. FIG. 7 is a schematic cross-sectional view of the light emitting device according to the third embodiment. FIG. 8 is a schematic cross-sectional view of the light emitting device according to the fourth embodiment. FIG. 9 is a schematic cross-sectional view of the light emitting device according to the fifth embodiment. FIG. 10 is a schematic cross-sectional view of the light emitting device according to the sixth embodiment. FIG. 11 is a schematic cross-sectional view of the light emitting device according to the seventh embodiment. FIG. 12A is a schematic cross-sectional view of a light-emitting device according to Embodiment 8. FIG. 12B is a schematic cross-sectional view of the light-emitting device according to Embodiment 8. FIG. 13 is a schematic cross-sectional view of the light emitting device according to the ninth embodiment. FIG. 14A is a schematic cross-sectional view of the light-emitting device according to Embodiment 10. FIG. 14B is a schematic cross-sectional view of the light-emitting device according to Embodiment 11. FIG. 15 is a schematic configuration diagram of a light irradiation apparatus including the light emitting device shown in FIG. FIG. 16 is a schematic configuration diagram of a light irradiation device including the light emitting device shown in FIG. FIG. 17 is a schematic configuration diagram of a light irradiation device including the light emitting device shown in FIG. FIG. 18A is a schematic plan view of the light emitting device. 18B is a schematic cross-sectional view of the light-emitting device shown in FIG. 18A taken along line XVIIIB-XVIIIB. FIG. 19 shows a light emission intensity distribution in the light emitting device shown in FIG. 18A. FIG. 20 shows a light emission intensity distribution in the plan view of the light emitting device shown in FIG. 12A. FIG. 21A shows a light emission intensity distribution in the plan view of the light emitting device shown in FIG. 14A.

  Hereinafter, a light emitting device according to an embodiment and a light irradiation device including the light emitting device will be described with reference to the drawings. Note that the dimensions, shapes, positional relationships, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same name and reference sign indicate the same or the same members in principle, and the detailed description will be omitted as appropriate. The embodiments described below can be applied by appropriately combining the components.

(Embodiment 1)
A light emitting device 100 according to Embodiment 1 is shown in FIGS. FIG. 1 is a schematic perspective view showing the light emitting device according to the first embodiment. FIG. 2 is a schematic plan view showing an arrangement of a plurality of light emitting elements of the light emitting device shown in FIG. 3A is a schematic cross-sectional view taken along line IIIA-IIIA of the light emitting device shown in FIG. FIG. 3B shows a light intensity distribution curve of the light emitting device in the schematic cross-sectional view shown in FIG. 3A. 4 is a schematic cross-sectional view taken along line IV-IV of the light emitting device shown in FIG. 3A. FIG. 5 is a schematic cross-sectional view taken along line VV of the light-emitting device shown in FIG. 3A.

  The light emitting device 100 is placed on the substrate 2, the plurality of light emitting elements 1 that are mounted on the substrate 2 and form three or more light emitting element arrays 6, and the three rows so as to be disposed on the light emitting element array 6. The above-mentioned cylindrical lens part 10 is provided with the translucent member 3 arranged in parallel. In the light emitting device 100 of Embodiment 1, as shown in FIG. 2, six light emitting element rows 6 are provided on the substrate 2 at substantially equal intervals, and are arranged on the light emitting element rows 6, respectively. Further, a translucent member 3 in which six rows of cylindrical lens portions 10 are arranged in parallel is provided. In the present specification, “substantially equidistant” includes minute ones having a difference of 2.0 mm or less.

In the parallel direction, the plurality of cylindrical lens units 10 are provided on the inner side of the first cylindrical lens unit 11 including the rows at both ends and the first cylindrical lens unit 11, and the height of the plurality of cylindrical lens units 10 is the highest. A high second cylindrical lens unit 12. In the first embodiment, as shown in FIG. 2 and FIG. 3A, a total of four rows of the plurality of cylindrical lens portions 10 in the parallel direction, that is, the rows at both ends and the inner rows adjacent to the rows at both ends are the first cylindrical lens portions. 11A and 11B. In addition, the two cylindrical lenses 12A are provided at the inner side of the first cylindrical lens portions 11A and 11B, and the two rows in the central portion having the highest height among the plurality of cylindrical lens portions 10 are the second cylindrical lens portions 12A. With the translucent member 3 having such a shape, for example, a plurality of cylindrical lens units are arranged in parallel as compared with a light emitting device having a translucent member in which a plurality of cylindrical lens units having substantially the same height are arranged in parallel. The slope of the light intensity distribution curve in the direction can be changed gently.
Hereinafter, the translucent member 3 of the light emitting device 100 will be described in detail.

(Translucent member 3)
The translucent member 3 seals the plurality of light emitting elements 1 arranged on the substrate 2, protects the light emitting elements 1 from external dust and stress, and a light emitting device having desired light distribution characteristics. The light distribution is adjusted so that As shown in FIG. 3A, the translucent member 3 of Embodiment 1 has a shape in which three or more rows of cylindrical lens portions 10 are connected by a connecting portion 13 on the lower end side (substrate side), and adjacent cylindrical lenses. A valley 7 is formed between the lens portions 10. As described above, the plurality of cylindrical lens portions 10 in the array shape are integrally provided by the connecting portion 13 that connects them, so that the light emission is performed as compared with the case where the plurality of cylindrical lens portions 10 are provided apart from each other. The light intensity distribution curve of the device can be a relatively smooth curve.

  Here, in the present specification, “the center of the plurality of cylindrical lens portions 10” means that the valley 7 located in the center in the parallel direction of the plurality of cylindrical lens portions 10 when the cylindrical lens portions 10 are an even number row of three or more rows. In the case where the cylindrical lens unit 10 is an odd number column of three or more columns, it indicates a column located at the center in the parallel direction of the plurality of cylindrical lens units 10. In addition, the translucent member 3 may have a collar portion that extends outward from the lower end portion of the cylindrical lens portion in addition to the plurality of cylindrical lens portions 10.

(Cylindrical lens part 10)
In this specification, the cylindrical lens unit 10 refers to a plano-convex type lens composed of a cylindrical surface that is an upper surface and a flat surface that is a lower surface. In the first embodiment, as shown in FIG. 3A, the cylindrical lens portion 10 has a substantially semi-elliptical shape or a semi-circular shape with a central convex cross section. The cylindrical lens unit 10 is juxtaposed in a direction perpendicular to the extending direction in plan view. In the first embodiment, the diameters of the plurality of cylindrical lens portions 10 are substantially equal to each other.

  The translucent member 3 is provided on the substrate 2 such that each cylindrical lens portion 10 is disposed on a light emitting element array 6 in which a plurality of light emitting elements 1 are arranged. Since at least three or more light emitting element rows 6 are provided on the substrate 2, the cylindrical lens portion 10 is also provided at least three or more rows. In the first embodiment, the cylindrical lens unit 10 is arranged so that the top thereof is positioned substantially at the center of the light emitting surface of the light emitting element 1.

  The translucent member 3 of the embodiment has a cylindrical lens portion 10 having different heights, that is, a first cylindrical lens portion 11, in order to transmit the emitted light of the plurality of light emitting elements 1 and obtain a desired light distribution, A second cylindrical lens unit 12. The first cylindrical lens unit 11 includes at least both ends of the plurality of cylindrical lens units 10. As shown in FIG. 3A, the second cylindrical lens unit 12 is an inner row of the first cylindrical lens unit 11, and the height (h1) thereof is the height (h2, h3) of the first cylindrical lens unit 11. ) And the height of the plurality of cylindrical lens portions 10 is the highest.

  In general, it is known that the directivity of the emitted light from the light emitting element can be increased as the height (h) of the cylindrical lens portion increases. Hereinafter, a mechanism in which the cylindrical lens unit 10 having a high height (h) has higher directivity than the cylindrical lens unit having a low height will be described.

In the first embodiment, as shown in FIG. 3A, the second cylindrical lens unit is obtained by increasing the height (a) without changing the diameter (b) of the cylindrical lens unit 10 having a substantially semi-elliptical cross section. The height of 12 is higher than that of the first cylindrical lens unit 11. Thus, the radius of curvature of the curved portion on the upper end side of the second cylindrical lens portion 12 is smaller than the radius of curvature of the curved portion on the upper end side of the first cylindrical lens portion 11, so that the second cylindrical lens portion 12 is the first cylindrical lens portion 12. Compared with the cylindrical lens part 11, the light condensing action is higher.
Further, when the height (h) of the cylindrical lens unit 10 is high, the light condensing function can be enhanced even in the extending direction of the cylindrical lens unit 10. 4 and 5, how the light emitted from the light emitting element 1 is emitted at the irradiation angle α in the extending direction of the cylindrical lens unit 10 is schematically indicated by arrows. As shown in the figure, the light transmitted through the first cylindrical lens unit 11B having a low height shown in FIG. 5 is compared with the light transmitted through the second cylindrical lens unit 12A having a high height shown in FIG. The diffusion effect increases as the lens interface is closer. For this reason, as for the cylindrical lens part 10, the one where the height (h) is higher tends to suppress the light diffusing action in the extending direction.

  As described above, the second cylindrical lens is obtained by the light collecting action due to the small curvature radius on the upper end side of the cylindrical lens part 10 and the light diffusion suppressing action due to the high height of the cylindrical lens part 10. The directivity of the part 12 is higher than the directivity of the first cylindrical lens part 11.

  The second cylindrical lens unit 12 is preferably provided at the center in the parallel direction of the plurality of cylindrical lens units 10. In this specification, the “central portion” means that the total length in the parallel direction of the plurality of cylindrical lens portions 10 is 100, one end side is represented as 0, and the other end side is represented as 100. It refers to the region of 40-60. More specifically, when the cylindrical lens unit 10 has three rows, the “central portion” is the central row, and when the cylindrical lens portion 10 is an odd row of five or more rows, the “central portion” is the central row and its adjacent sides. Is a column including at least one column. In addition, the “central portion” when the cylindrical lens unit 10 has four rows is two rows that form a valley located at the center, and the “central portion” when the cylindrical lens portion 10 is an even row of six or more rows is at the center. It is a row | line | column containing the at least 1 row | line | column which adjoins the 2 row | line | column which forms the located valley, and the both. By providing the second cylindrical lens portion 12 having high directivity as described above in such a range, the light emitting device 100 having high light intensity at the center portion of the light intensity distribution curve can be obtained.

  In the first embodiment, as shown in FIG. 3A, the translucent member 3 has six rows of cylindrical lens portions 10, and is adjacent to the rows at both ends and the rows at both ends of the six rows of cylindrical lens portions 10. A total of four rows are the first cylindrical lens portions 11, and two rows inside them, that is, rows forming the central valley 7 of the plurality of cylindrical lens portions 10 have a height in the plurality of cylindrical lens portions 10. This is the highest second cylindrical lens unit 12.

  The translucent member 3 shown in FIG. 3A has the highest height (h1) of the second cylindrical lens portion 12A, and the lowest height (h3) of the first cylindrical lens portions 11B at both ends. Further, the height of the first cylindrical lens unit 11 is set so that the height gradually decreases from the second cylindrical lens unit 12 toward the outside. The heights of the first cylindrical lens unit 11 and the second cylindrical lens unit 12 can be appropriately set according to desired light distribution characteristics, dimensions and arrangement of the light emitting elements 1, and the like. The height of the 1st cylindrical lens part 11 and the 2nd cylindrical lens part 12 can be 0.1 mm-4.0 mm, for example. In the first embodiment, for example, the height of the cylindrical lens unit 10 can be set to be 0.1 mm lower from the second cylindrical lens unit 12 to the outside. Specifically, in FIG. 3A, the height of the first cylindrical lens portion 11A is set to be 0.1 mm lower than the height of the second cylindrical lens portion 12A, and the height of the first cylindrical lens portion 11B is set to the first cylindrical lens. It can be set 0.1 mm lower than the height of the portion 11A. By adopting such a configuration, as shown in FIG. 3B, the light intensity distribution curve of the light emitting device having a translucent member having a shape in which a plurality of cylindrical lens portions having substantially the same height are arranged side by side is obtained. The light emitting device 100 in which the slope of the intensity distribution curve changes gradually and the light intensity increases near the center thereof can be obtained. 3B uses the light emitting element 1 having a plan view of 1.4 mm × 1.4 mm and a thickness of 0.3 mm, and the diameters (b1, b2, b3) of the respective cylindrical lens portions 10 are 3. FIG. 0 mm, the height (h1) of the second cylindrical lens portion 12A is 3.5 mm, the height (h2) of the first cylindrical lens portion 11A is 2.8 mm, and the height (h3) of the first cylindrical lens portion 11B is 2. The light intensity distribution curve of the light-emitting device which has the translucent member 3 which is 0.5 mm is shown.

  Further, the heights of the plurality of cylindrical lens portions 10 shown in FIG. 3A are symmetric with respect to the center in the parallel direction (the central valley 7 in the first embodiment). That is, the heights (h1) of the two rows of second cylindrical lens portions 12A provided in the central portion are substantially equal, and the heights of the left and right two rows of first cylindrical lens portions 11A provided on both sides of the second cylindrical lens portion 12A. (H2) is substantially equal, and the heights (h3) of the first cylindrical lens portions 11B in the two adjacent columns, that is, the two left and right columns provided at both ends are substantially equal. As described above, when the heights of the plurality of cylindrical lens units 10 are symmetric with respect to the center in the parallel direction, the light intensity distribution curves of the light emitting device 100 in the parallel direction of the cylindrical lens units 10 are symmetric. Can do. In addition, the height of the plurality of cylindrical lens units 10 may be asymmetrical with respect to the center in the parallel direction to realize a desired light distribution.

  As a material of the translucent member 3, a resin such as a thermosetting resin or a thermoplastic resin, glass, or the like can be used. As the resin, for example, a silicone resin or the like can be used from the viewpoints of durability, ease of molding, and the like. The translucent member 3 can be provided by compression molding, transfer molding, casting molding, or the like. For example, the plurality of cylindrical lens portions 10 can be formed on the upper surface of the substrate 2 on which the plurality of light emitting elements 1 are mounted. Molding can be performed by closing the mold with a mold provided with a recess and injecting a liquid material into a space formed by the substrate and the mold and then curing the material. In addition, by adjusting conditions such as viscosity, a material such as a resin may be drawn in a line shape on each light emitting element array and cured.

  Here, the occurrence of voids in the translucent member 3 can be prevented by adjusting the uneven state of the surface of the substrate 2 and the viscosity, temperature, injection pressure, etc. of the resin during injection. By securing a sufficient space between the plurality of light emitting elements 1 on the substrate 2, the fluidity of the translucent member 3 to be injected can be improved and the generation of voids can be suppressed. Further, as a pre-process for injecting the translucent member 3, the fluidity of the translucent member 3 at the time of molding can also be improved by wetting the substrate 2 on which the light emitting element 1 is mounted with an organic solvent or the like. it can. As the organic solvent, methyl ethyl ketone (MEK) or the like can be used.

(Light emitting element 1)
The light emitting element 1 is preferably a semiconductor light emitting element such as a light emitting diode. As such a semiconductor light emitting device, a device in which a nitride semiconductor or the like is formed is preferably used. The light-emitting element 1 includes a semiconductor layer including at least a light-emitting layer and positive and negative electrodes. For example, In _X Al _Y Ga _1-XY N (0 ≦ X ≦ 1, 0 ≦ Y ≦ 1, X + Y ≦ 1) can be used as the material of the light emitting layer. In the present embodiment, light emitting elements having various emission wavelengths from ultraviolet light to infrared light can be selected, and those that emit ultraviolet light in particular can be used. Here, the ultraviolet light refers to light having a light emission wavelength of 400 nm or less, and in particular, light that emits light in a region called a near ultraviolet light having a light emission wavelength of 330 nm to 380 nm can be suitably used.

  The light-emitting element 1 of Embodiment 1 includes electrodes on the upper surface and the lower surface, and the lower surface electrode is bonded to the conductive layer 5 on the substrate 2 with a conductive adhesive or the like. Examples of the conductive adhesive include solders such as Au—Sn and Au—In. The upper electrode of the light emitting element 1 is energized by the conductive wire 4 to the conductive layer 5 adjacent to the conductive layer 5 to which the lower electrode is connected. The light-emitting element 1 shown in FIG. 2 is provided with an electrode at the center of the upper surface, and this electrode and the conductive layer 5 are connected by a single conductive wire 4. The number of electrodes, the number of electrodes and conductive wires, and the like can be changed as appropriate. Note that the light emitting element may be one in which positive and negative electrodes are provided on the same surface, and the surface having the electrode may be bonded to the conductive layer 5 by a conductive adhesive, or on the opposite side to the surface having the electrode. These surfaces may be connected to the conductive layer 5 by an insulating adhesive, and the respective electrodes and the conductive layer may be electrically connected by a conductive wire.

  The light emitting element 1 shown in FIG. 2 has a quadrangular planar shape. Examples of the quadrangle include a square and a rectangle. However, the planar shape of the light emitting element is not limited to this, and may be a polygon such as a hexagon, a circle, an ellipse, or the like. Further, the size and thickness of the light emitting element 1 can be selected as appropriate. For example, the light emitting element 1 having a plan view of 1.4 mm × 1.4 mm and a thickness of 0.3 mm can be used.

  As shown in FIG. 2, the plurality of light emitting elements 1 are arranged in a line to form at least three or more light emitting element arrays 6, and a plurality of the light emitting element arrays 6 are arranged in a matrix. Yes. In FIG. 2, twelve light emitting elements 1 are mounted on one light emitting element array 6, and six light emitting element arrays 6 are provided. Therefore, the light emitting device 100 includes 72 light emitting elements 1. However, the present invention is not limited to this, and the arrangement pattern of the light emitting elements 1, the number of light emitting elements 1, and the number of light emitting element arrays 6 can be changed as appropriate. In the first embodiment, the light emitting elements 1 of the light emitting element array 6 are placed at substantially equal intervals, and the light emitting element arrays 6 are arranged at approximately equal intervals. Thus, it is preferable to provide the light emitting elements 1 and the light emitting element rows 6 at substantially equal intervals, because the light emitting elements 1 can be easily placed.

  A plurality of light emitting elements 1 shown in FIG. 2 are connected in 12 series and 6 in parallel via a conductive layer 5 and a conductive wire 4. However, the connection pattern is not limited to this, and can be changed as appropriate. In the first embodiment, the arrangement direction of the plurality of light emitting elements 1 connected in series and the extending direction of the cylindrical lens unit 10 are provided so as to coincide with each other. By doing in this way, it is easy to provide the valley 7 where the thickness of the translucent member 3 is relatively thin and the connection portion between the conductive wire 4 and the conductive layer 5 connected to the light emitting element 1 so as not to overlap. Therefore, it is difficult for external stress to be applied to the connection portion, and disconnection of the conductive wire 4 can be suppressed.

(Substrate 2)
As shown in FIGS. 2 and 3A, the substrate 2 includes an insulating base material 2 </ b> A and a conductive layer 5 provided on the base material 2 </ b> A for supplying power to the light emitting element 1. As shown in FIG. 1, the substrate 2 may have holes 18 on both ends thereof for fixing the light emitting device 100 to the mounting substrate using a fixture 19.

  Examples of the material of the base material 2A include insulating materials such as ceramics, resin, and glass. In particular, from the viewpoint of heat dissipation, ceramics that are inorganic materials are preferable. As the ceramic, AlN having particularly high heat dissipation is preferable.

  The material of the conductive layer 5 is not particularly limited as long as it can be electrically connected to the light-emitting element 1, and can be formed using a material known in this field. For example, Cu, Ni, Pd, W, Cr, Ti, Al, Ag, Au, or an alloy thereof can be used. In particular, Cu or Cu alloy is preferable from the viewpoint of heat dissipation. Note that Ag, Pt, Sn, Au, Cu, Rd, an alloy thereof, or an oxide film may be formed on the surface of the conductive layer 5. The conductive layer 5 may be formed by plating, sputtering, or other known methods, or a lead frame may be used to form a substrate such as a resin on the lead frame to form the substrate 2.

(Conductive wire 4)
In the first embodiment, the conductive wire 4 electrically connects the upper surface electrode of the light emitting element 1 and the conductive layer 5 adjacent to the conductive layer 5 on which the light emitting element 1 is placed. The conductive wire 4 is a metal wire and is connected so as to form a predetermined loop shape. Examples of the material of the conductive wire 4 include Au.

  In addition, the light emitting device 100 may include an electronic component such as a protection element. Examples of the protective element include a Zener diode, a capacitor, and a varistor. In particular, by mounting a Zener diode as a protective element on the light emitting device 100, the light emitting device 100 with high driving reliability can be provided.

(Embodiment 2)
FIG. 6 is a schematic cross-sectional view of the light emitting device 200 according to the second embodiment. In the light emitting device 200 of the second embodiment, the shape of the translucent member 23 is different from the shape of the translucent member 3 of the first embodiment shown in FIG. 3A. The translucent member 23 shown in FIG. 6 has a shape in which six rows of cylindrical lens portions 10 are coupled by a coupling portion 13 in the same manner as the translucent member 3 of the first embodiment. The column is the highest second cylindrical lens portion 12B in the plurality of cylindrical lens portions 10. In addition, a total of four rows each of the left and right two rows outside the second cylindrical lens portion 12B are the first cylindrical lens portions 11C and 11D. In the translucent member 23 shown in FIG. 6, the height (h3) of the two rows of the first cylindrical lens portions 11D at both ends of the plurality of cylindrical lens portions 10 is the lowest, and outward from the second cylindrical lens portion 12. The height of the cylindrical lens portion 10 is gradually lowered. Furthermore, the heights of the plurality of cylindrical lens portions 10 shown in FIG. 6 are symmetric with respect to the center in the parallel direction (the middle valley in the second embodiment). That is, the height (h1) of the two rows of the second cylindrical lens portions 12B provided in the central portion is substantially equal, and the height of the two rows of the first cylindrical lens portions 11C provided on both sides of the second cylindrical lens portion 12B ( h2) is substantially equal, and the height (h3) of the first cylindrical lens portions 11D provided at the outer rows of the first cylindrical lens portions 11C, that is, at both ends of the plurality of cylindrical lens portions 10, is substantially equal.

  In the plurality of cylindrical lens portions 10 shown in FIG. 6, the curvature radius of the curved portion 10b on the upper end side is almost equal, and the first cylindrical lens portion 10a is changed by changing the height of the columnar portion 10a formed on the lower end side. The heights of the lens unit 11 and the second cylindrical lens unit 12 are changed. That is, the translucent member 23 shown in FIG. 6 raises the height of the columnar portion 10a of the second cylindrical lens portion 12B so that the height of the curved portion 10b is higher than that of the curved portion 10b of the first cylindrical lens portion 11. doing.

  In the plurality of cylindrical lens portions 10 of the second embodiment, since the curvature radius of the curved portion 10b is equal, there is not much difference in directivity in this portion, but the columnar portion 10a of the second cylindrical lens portion 12B is replaced with the first cylindrical lens portion. By making it higher than the columnar portions 10a of 11C and 11D, the light of the light emitting element 1 is efficiently reflected toward the curved portion 10b, and the directivity of the second cylindrical lens portion 12B is made to be higher than that of the first cylindrical lens portions 11C and 11D. It is higher than directivity.

  Further, similarly to the above description, the second cylindrical lens unit 12B is directed by the action of suppressing the diffusion of light due to the height of the second cylindrical lens unit 12B being higher than the height of the first cylindrical lens units 11C and 11D. Is higher than the directivity of the first cylindrical lens portions 11C and 11D.

In the translucent member 23 shown in FIG. 6, the valley 7 between the adjacent cylindrical lens portions 10 is cut deeper than the valley 7 between the cylindrical lens portions 10 of Embodiment 1 shown in FIG. 3A. It has a shape. Thereby, the columnar part 10a of the cylindrical lens part 10 can be provided, and the directivity of the 2nd cylindrical lens part 12 can be improved. However, the translucent member 23 shown in FIG. 6 may be provided so that the columnar portions 10a of the adjacent cylindrical lens portions 10 are in contact with each other.
As described above, by providing the translucent member 23 in which the height of the first cylindrical lens unit 11 is set so that the height gradually decreases from the second cylindrical lens unit 12 toward the outside, a plurality of translucent members 23 are provided. The inclination of the light intensity distribution curve of the light emitting device 200 in the parallel direction of the cylindrical lens unit 10 can be gradually changed.

(Embodiment 3)
FIG. 7 is a schematic cross-sectional view of the light emitting device 300 according to the third embodiment. In the light emitting device 300 according to the third embodiment, the shape of the translucent member 33 is different from the shape of the translucent member according to the first and second embodiments. Specifically, the translucent member 33 of the light emitting device 300 of Embodiment 3 includes the odd-numbered columns, here, the five rows of cylindrical lens portions 10, and the five rows of cylindrical lens portions 10 are connected by the connecting portion 13. Shape. Further, among the five rows of cylindrical lens portions 10, the center column is the second cylindrical lens portion 12C, which is the highest, and a total of four rows on the outer left and right rows are the first cylindrical lens portions 11A and 11B. In the translucent member 33 shown in FIG. 7, the two rows of first cylindrical lens portions 11B at the ends of the five rows of cylindrical lens portions 10 are the lowest, and the cylindrical lens portions 10 are directed outward from the second cylindrical lens portion 12C. The height is low. Further, the heights of the five rows of cylindrical lens portions 10 shown in FIG. 7 are symmetrical with respect to the second cylindrical lens portion 12C as the center row. That is, the heights of the two rows of the first cylindrical lens portions 11A provided on both sides of the second cylindrical lens portion 12C are substantially equal, and the outer rows of the first cylindrical lens portions 11A, that is, both ends of the plurality of cylindrical lens portions 10 are arranged. The heights of the first cylindrical lens portions 11B that are columns are substantially equal.

The second cylindrical lens portion 12C of the third embodiment has a flat portion 10c on the upper end side. Note that a flat portion may be provided on the upper end side of the first cylindrical lens portion 11, or a flat portion may be provided on the upper end sides of both the cylindrical lens portions 10.
As described above, by providing the translucent member 33 in which the height of the first cylindrical lens unit 11 is set so that the height gradually decreases from the second cylindrical lens unit 12 toward the outside, a plurality of translucent members 33 are provided. The inclination of the light intensity distribution curve of the light emitting device 300 in the parallel direction of the cylindrical lens unit 10 can be gradually changed. Furthermore, since the cylindrical lens portion 10 of the translucent member 33 has a flat portion, the light in that portion can be diffused, so that the slope of the light intensity distribution curve of the light emitting device can be changed more gently. It is.

(Embodiment 4)
FIG. 8 is a schematic cross-sectional view of the light emitting device 400 according to the fourth embodiment. The translucent member 43 of the light emitting device 400 of the fourth embodiment also includes five rows of cylindrical lens portions 10 as in the third embodiment. The upper end side of the five rows of cylindrical lens portions 10 of the fourth embodiment is a curved surface, and is the second cylindrical lens portion 12A having the highest height in the center row, and the first cylindrical lens portion 11B on both sides thereof and the outside thereof. The height of the first cylindrical lens portion 11B is lower than that of the second cylindrical lens portion 12A, and all are substantially equal.
With the configuration of the translucent member 43 as described above, the inclination of the light intensity distribution curve of the light emitting device 400 in the parallel direction of the plurality of cylindrical lens units 10 can be gradually changed, and the plurality of cylindrical lenses can be changed. The light intensity distribution curve of the light-emitting device 400 in the parallel direction of the units 10 can be pointed.

(Embodiment 5)
FIG. 9 is a schematic cross-sectional view of the light emitting device 500 according to the fifth embodiment. The light transmissive member 53 of the light emitting device 500 according to the fifth embodiment includes five rows of cylindrical lens portions 10. The upper end side of the five rows of cylindrical lens portions 10 is a curved surface, which is the second cylindrical lens portion 12A having the highest height in the center row. In the fifth embodiment, a total of four rows each of the left and right two rows outside the second cylindrical lens portion 12A are the first cylindrical lens portions 11A and 11B. In the fifth embodiment, the height of the first cylindrical lens portions 11A at both ends of the five rows of cylindrical lens portions 10 is higher than the height of the first cylindrical lens portions 11B inside thereof. Further, the heights of the five rows of cylindrical lens portions 10 shown in FIG. 9 are symmetric with respect to the second cylindrical lens portion 12A as the center row. That is, the heights of the two rows of the first cylindrical lens portions 11B provided on both sides of the second cylindrical lens portion 12A are substantially equal, and are arranged on the outer rows of the first cylindrical lens portions 11B, that is, at both ends of the plurality of cylindrical lens portions 10. The heights of the first cylindrical lens portions 11A that are rows are substantially equal.
As described above, by providing the translucent member 53 having the first cylindrical lens unit 11 having a lower height outside the second cylindrical lens unit 12, light emission in the parallel direction of the plurality of cylindrical lens units 10 is achieved. The inclination of the light intensity distribution curve of the apparatus 500 can be changed gently, and the cylindrical lens unit having the lowest height is provided between the second cylindrical lens unit 12 and the first cylindrical lens unit 11 to emit light. It is possible to form a trough between the center and end of the light intensity distribution curve of the device.

(Embodiment 6)
FIG. 10 is a schematic cross-sectional view of a light emitting device 600 according to the sixth embodiment. In the first to fifth embodiments, the light-transmitting member directly covers the light-emitting element 1 on the substrate 2. However, the present invention is not limited to this. It is good. The translucent member that directly covers the light emitting element 1 can be provided, for example, by molding using a mold or the like. However, in the sixth embodiment, as shown in FIG. A translucent member 63 provided with a concave portion 16 is prepared and placed on the substrate 2 so that the light emitting elements 1 on the substrate 2 are accommodated. Since the translucent member 63 and the light emitting element 1 can be separated by providing the translucent member 63 in this manner, the translucent member is prevented from being deteriorated by light or heat of the light emitting element 1. be able to. Further, by placing a previously prepared translucent member on the substrate, the substrate 2 and the light emitting element 1 can be compared to the case where the translucent member is directly formed on the substrate 2 on which the light emitting element 1 is placed. It is possible to reduce the influence of heat applied to. The translucent member 63 formed in a predetermined shape in advance can be fixed on the substrate 2 by adhesion or the like.

(Embodiment 7)
FIG. 11 is a schematic cross-sectional view of a light emitting device 700 according to the seventh embodiment. As shown in FIG. 11, in the light transmissive member 73 of the light emitting device 700 according to the seventh embodiment, a plurality of adjacent cylindrical lens portions 10 are arranged in parallel with each other and do not have a connecting portion. Specifically, the cylindrical lens unit 10 according to the seventh embodiment includes a curved portion 10b on the upper end side and a columnar portion 10a below the curved portion 10b. In addition, two rows arranged at the center of the six rows of cylindrical lens portions 10 are the second cylindrical lens portions 12 </ b> D that are the highest in the plurality of cylindrical lens portions 10. Further, the first cylindrical lens portions 11E and 11F are a total of four rows each including two left and right rows outside the second cylindrical lens portion 12D. In the translucent member 73 shown in FIG. 7, the heights of the two rows of the first cylindrical lens portions 11F at both ends of the plurality of cylindrical lens portions 10 are the lowest, and the cylindrical lens portions outward from the second cylindrical lens portion 12D. The height of 10 is gradually getting lower. Furthermore, the heights of the plurality of cylindrical lens portions 10 are symmetrical with respect to the central valley 7 in the parallel direction. That is, the heights of the two rows of the second cylindrical lens portions 12D provided in the central portion are substantially equal, and the heights of the two rows of the first cylindrical lens portions 11E provided on both sides thereof are substantially equal. The heights of the first cylindrical lens portions 11F provided at both ends of the plurality of cylindrical lens portions 10 are substantially equal.

Also in the seventh embodiment, by providing the translucent member 73 in which the height of the first cylindrical lens unit 11 is set so that the height gradually decreases from the second cylindrical lens unit 12 toward the outside, a plurality of translucent members 73 are provided. The inclination of the light intensity distribution curve of the light emitting device 700 in the parallel direction of the cylindrical lens portions 10 can be gently changed, and a plurality of adjacent cylindrical lens portions 10 are arranged in parallel with each other, thereby the light emitting device It is possible to form a plurality of valleys in the light intensity distribution curve.
11 shows the light emitting device 700 having the light transmissive member 73 in which a plurality of cylindrical lens portions 10 each having a columnar portion 10a on the lower end side are separated and arranged in parallel. For example, as shown in FIG. As a translucent member in which a plurality of cylindrical lens portions 10 having a substantially semi-elliptical shape are arranged apart from each other in parallel (that is, the translucent member 3 shown in FIG. 3A does not have the connecting portion 13). Also good.

  In the first to seventh embodiments described above, a light-emitting device having a translucent member that includes six rows of cylindrical lens portions and that has the second cylindrical lens portions 12 in the rows adjacent to the central valley, or five rows of cylindrical lenses. Although the light-emitting device having the translucent member including the second cylindrical lens portion 12 in the center row is shown, the number of rows of the cylindrical lens portions is not particularly limited as long as it is three or more. Further, in the translucent member provided with six rows of cylindrical lens portions, a total of four rows, ie, the rows adjacent to the central valley and the rows adjacent to both sides may be used as the second cylindrical lens portion 12. Moreover, in a translucent member provided with five rows of cylindrical lens portions, a total of three rows, that is, the central row and its neighboring rows may be used as the second cylindrical lens portion 12.

(Embodiment 8)
FIG. 12A is a schematic cross-sectional view of a light-emitting device 800A according to Embodiment 8. In the eighth embodiment, one light emitting device 800A is provided by arranging the light emitting units 9 in parallel. Each light-emitting unit 9 constituting the light-emitting device 800A includes a substrate 2, a plurality of light-emitting elements 1 mounted on the substrate 2 to form the light-emitting element array 6, and a cylindrical lens disposed on the light-emitting element array 6, respectively. A translucent member 83 having a portion 10. A plurality of light emitting element rows 6 of the light emitting unit 9 of Embodiment 8 are provided in the same direction as the direction in which the light emitting units 9 are arranged side by side.

  The light transmissive members 83 of each light emitting unit 9 shown in FIG. 12A are each provided with four rows of cylindrical lens portions 10, and the cylindrical lens portion 10 having the highest height on one end side in the parallel direction thereof, The height is gradually decreased from the cylindrical lens portion 10 toward the other end side. In the light emitting device 800A of the eighth embodiment, the two light emitting units 9 are arranged in parallel so that the cylindrical lens portion 12E having the highest height provided on one end side in the parallel direction of the plurality of cylindrical lens portions 10 faces each other. Yes. Therefore, the light-emitting device 800A in which the two light-emitting units 9 are arranged side by side has eight rows of cylindrical lens portions 10 in total, and the two rows of cylindrical lens portions 10 facing each other of the light-emitting units 9 are the second. These are the cylindrical lens portions 12E, and the total six rows of cylindrical lens portions 10 outside them are the first cylindrical lens portions 11G, 11A, and 11B. In the eighth embodiment, the heights of the eight rows of cylindrical lens portions 10 of the light emitting device 800 </ b> A are symmetrical with respect to each other between the light emitting units 9.

  Thus, when the heights of the plurality of cylindrical lens units 10 are symmetric with respect to the center in the parallel direction, the light intensity distribution curve of the light emitting device 800A in the parallel direction of the plurality of cylindrical lens units 10 is symmetric. can do. In the light emitting device 800A of the eighth embodiment, the light emitting units 9 having the same shape of the translucent member 83 are arranged side by side so that the second cylindrical lens portion 12E is opposed to each other, so that the height relationship is left and right with respect to the center. A light-emitting device 800 having a symmetrical translucent member 83 can be easily provided. Note that the height of the plurality of cylindrical lens portions 10 of the light emitting device may be asymmetrical with respect to the center in the parallel direction to achieve a desired light distribution.

  In the light emitting device 800A shown in FIG. 12A, two light emitting units 9 each having three or more rows of cylindrical lens portions 10 are arranged side by side. However, the light emitting device is a translucent member of a plurality of light emitting units. It is only necessary to have three or more rows of cylindrical lenses. FIG. 12B is a schematic cross-sectional view of a light-emitting device 800B according to Embodiment 8. In the light emitting device 800B shown in FIG. 12B, each of the light transmissive members 103 of the light emitting units 39 includes two rows of cylindrical lens portions 10, and the light emitting device 800B has a total of three or more rows (in the light emitting device 800B of FIG. 12B). 4 rows) of cylindrical lens portions 10. In the light emitting unit 39 of the light emitting device 800B, the height of one cylindrical lens portion (second cylindrical lens portion 12) of the two rows of cylindrical lens portions 10 is high, and the other cylindrical lens portion (first cylindrical lens portion 11). ) Is lower than that. The two light emitting units 39 are arranged in parallel so that the second cylindrical lens portions 12 face each other, thereby providing the light emitting device 800B.

  In the eighth embodiment, the light emitting device in which two light emitting units are arranged in parallel is shown. However, the light emitting device may have three or more light emitting units arranged in parallel. For example, three light emitting units each having a light-transmitting member having a single cylindrical lens portion are prepared, the light emitting unit having the highest cylindrical lens portion is arranged in the middle of the three light emitting units, and the other two A light emitting device can be provided by arranging two light emitting units side by side. As described above, a light-emitting device including a plurality of light-emitting units has a desired light distribution by changing the number of light-emitting units arranged in parallel and the number of light-emitting element rows and cylindrical lens portions of each light-emitting unit. It can be set as the light-emitting device which has.

  In the light-emitting devices 800A and 800B shown in FIGS. 12A and 12B, the light-emitting units each have the first cylindrical lens unit 11 and the second cylindrical lens unit 12, and thus the light intensity distribution curves of the light-emitting devices 800A and 800B in the parallel direction. Can be changed relatively slowly. In addition, by arranging two light emitting units side by side so that the second cylindrical lens portions 12 face each other, in the light intensity distribution curve of the light emitting device in the direction in which the light emitting units are arranged, a convex portion is provided near the center. It is possible to form.

(Embodiment 9)
FIG. 13 is a schematic cross-sectional view of a light emitting device 900 according to the ninth embodiment. The light emitting device 900 shown in the ninth embodiment is configured by arranging a plurality of light emitting units 9 in parallel, similarly to the light emitting devices 800A and 800B shown in the eighth embodiment, but the arrangement thereof is different. In the light emitting device 900 shown in FIG. 13, the second cylindrical lens portion 12 </ b> E having the highest height provided on one end side of one light emitting unit 9, and the first provided on the other end side of the other light emitting unit 9. Two light emitting units 9 are arranged side by side so as to face the cylindrical lens portion 11B.

  In the light emitting device 900, since the light emitting unit 9 has the first cylindrical lens unit 11 and the second cylindrical lens unit 12, respectively, the inclination of the light intensity distribution curve of the light emitting device 900 in the parallel direction is changed relatively gently. be able to. Furthermore, in the ninth embodiment, the second cylindrical lens portion 12E of the light emitting unit 9 located on the left side in FIG. 13 and the second cylindrical lens portion 12E of the light emitting unit 9 located on the right side emit light in the juxtaposed direction of the light emitting units. Two convex portions can be formed in the light intensity distribution curve of the device.

  In the ninth embodiment, a light emitting device that exhibits a light intensity distribution curve having three or more convex portions using three or more light emitting units may be provided. Moreover, a desired light intensity distribution curve can be obtained by appropriately adjusting the height and the number of rows of the second cylindrical lens portion and the first cylindrical lens portion of the light emitting units arranged side by side.

  The light emitting units 9 and 39 described above include a plurality of light emitting elements 1 and a plurality of light emitting elements 1 mounted on the substrate 2 to form a plurality of light emitting element arrays, respectively. The cylindrical lens part 10 is provided with the translucent members 83 and 103 arranged in parallel. The light emitting element rows are provided at substantially equal intervals. The plurality of cylindrical lens units 10 includes a first cylindrical lens unit 11 and a second cylindrical lens unit 12 having different heights. The second cylindrical lens unit 12 has the highest height in the plurality of cylindrical lens units 10 and is provided at one end in the parallel direction of the plurality of cylindrical lens units 10.

  In the present specification, the “end portion” in the parallel direction of the plurality of cylindrical lens portions is represented by 100 as the total length of the plurality of cylindrical lens portions 10 in the parallel direction, with 0 representing one end side and 100 representing the other end side. It shall refer to the 0-20 or 80-100 area of both ends. Specifically, when the cylindrical lens unit 10 has 3 to 5 rows, the “end portion” is at least one of the rows at both ends, and when the cylindrical lens portion 10 has 6 rows or more, the “end portion” The column includes at least one column and at least one column adjacent to the column.

In the example shown in FIGS. 12A, 12B, and 13, the light emitting unit has the second cylindrical lens portion 12 having the highest height disposed on one end side , but a plurality of light emitting units are arranged in parallel to emit light. When configuring the device, depending on the combination of the light emitting units, the height of the second cylindrical lens portion having the highest height in one light emitting unit is not necessarily the highest in the light emitting device. Moreover, the number of columns of the cylindrical lens portions of the light emitting units arranged side by side may not be the same. Such an example is shown below.

(Embodiment 10)
FIG. 14A is a schematic cross-sectional view of the light-emitting device 1000 according to Embodiment 10, and shows an example in which light-emitting units having different numbers of cylindrical lens portions are arranged in parallel. In the light-emitting device 1000 shown in FIG. 14A, the light-emitting unit 9 shown on the left side includes a translucent member 83 having four rows of cylindrical lens portions 10, and one end of the second cylindrical lens portion 12E having the highest height. The first cylindrical lens portions 11G, 11A, and 11B are provided so that the height decreases from the second cylindrical lens portion 12E toward the other end side. In addition, the light emitting unit 29 illustrated on the right side in FIG. 14A includes a translucent member 93 having three rows of cylindrical lens portions 10, a second cylindrical lens portion 2F having the highest height at one end, and a first The first cylindrical lens portions 11A and 11B are provided so that the height decreases from the two cylindrical lens portion 12F toward the other end side. Here, the height of the second cylindrical lens portion 12F of the right light emitting unit 29 is lower than the height of the second cylindrical lens portion 12E of the left light emitting unit 9.

  In the light emitting device 1000 of FIG. 14A, the two light emitting units 9 and 29 are arranged in parallel so that the second cylindrical lens portions 12E and 12F face each other. Here, the second cylindrical lens portion 12E of the light emitting unit 9 has the highest height in the light emitting device 1000 and functions as the second cylindrical lens portion 12E. However, the second cylindrical lens portion 12F of the light emitting unit 29 is the light emitting device. Since the height is lower than the second cylindrical lens portion 12E of the light emitting unit 9 at 1000, it functions as the first cylindrical lens portion 11G.

  The light emitting device 1000 shown in FIG. 14A is composed of seven rows of cylindrical lens portions 10 as a whole, and is substantially bilaterally symmetric with respect to the second cylindrical lens portion 12E as the center row. In the light emitting device 1000, the slope of the light intensity distribution curve in the parallel direction of the plurality of cylindrical lens portions 10 can be gradually changed, and the light intensity distribution curve in the parallel direction of the cylindrical lens portions 10 is convex near the center. The part can be formed.

(Embodiment 11)
FIG. 14B is a schematic cross-sectional view of the light-emitting device 1100 according to Embodiment 11. In the light emitting device 1100 shown in FIG. 14B, the second cylindrical lens portion 12E of the left side light emitting unit 9 of the light emitting device 1000 shown in FIG. 14A and the first cylindrical lens portion 11B of the right side light emitting unit 29 face each other. Two light emitting units 9 and 29 are arranged side by side. Also in this light emitting device 1100, the second cylindrical lens portion 12E of the light emitting unit 9 is the second cylindrical lens portion 12E having the highest height in the light emitting device 1100, but the second cylindrical lens portion 12F of the light emitting unit 29 is The light emitting device 1100 functions as the first cylindrical lens unit 11G.

  The light-emitting device 1100 is composed of seven rows of cylindrical lens portions 10 as a whole, and the cylindrical lens portions are arranged from the left side to the right side (or from the right side to the left side) of the figure with the second cylindrical lens portion 12E as the center row interposed therebetween. Is high (or low). In the light emitting device 1100, the inclination of the light intensity distribution curve in the parallel direction of the plurality of cylindrical lens portions 10 can be gently changed, and convex portions having two different heights can be formed.

  As shown in FIGS. 12A to 14B of the eighth to eleventh embodiments, a light emitting device in which a plurality of light emitting units are arranged in parallel and equipped with a light emitting element that emits ultraviolet light is shown in FIG. 3A, for example. In some cases, it is easier to cure the ink or the like more reliably than the integrated light emitting device 100 as described above. The reason will be described below.

  18A is a schematic plan view of the light emitting device 1200. FIG. 18B is a schematic cross-sectional view taken along line XVIIIB-XVIIIB of light-emitting device 1200 shown in FIG. 18A. A light emitting device 1200 shown in FIG. 18A and FIG. 18B has eight light emitting element rows 6 provided on the substrate 2 at substantially equal intervals, and is arranged on each of the light emitting element rows 6. The lens unit 10 includes a translucent member 113 arranged in parallel. The light emitting device 1200 is not a form in which the light emitting units are arranged in parallel but a light emitting device provided integrally. More specifically, the cylindrical lens portion 10 of the light emitting device 1200 has a shape in which the cylindrical lens portions 12E of the translucent member 83 of each light emitting unit 9 shown in FIG. Therefore, the difference between the light emitting device 1200 shown in FIGS. 18A and 18B and the light emitting device 800A shown in FIG. 12A is that the substrates and the translucent members are connected to each other in the center in the parallel direction of the cylindrical lens portion. Since the configuration is substantially the same except for the above, detailed description is omitted.

FIG. 19 shows a light emission intensity distribution in the light emitting device 1200 shown in FIG. 18A. FIG. 20 shows a light emission intensity distribution in the plan view of the light emitting device 800A shown in FIG. 12A. 19 and 20, the peak light emission intensity is higher in the integrated light emitting device 1200 shown in FIG. 18A than in the light emitting device 800A in which the light emitting units 9 shown in FIG. 12A are arranged in parallel. However, an area (area surrounded by a chain line in the drawing) equal to or higher than a threshold (for example, 3 W / cm ² ) necessary for ink curing is the light emitting device 800A in which the light emitting units 9 shown in FIG. Is wider. Therefore, when using a light emitting device in which a plurality of light emitting units are arranged in parallel, it takes a longer time for the ink to undergo a curing reaction and the ink is more reliably cured than when using an integrally provided light emitting device. There is.

  FIG. 21 shows a light emission intensity distribution in the plan view of the light emitting device 1000 shown in FIG. 14A. As described above, the light-emitting device 1000 shown in FIG. 14A includes the four rows of cylindrical lens portions 10 and has the second cylindrical lens portion 12E having the highest height on one end side, from one end side to the other end side. A light emitting unit 9 having a light transmissive member 83 in which the height of the cylindrical lens portion 10 is reduced, and three rows of cylindrical lens portions 10 are provided, and the cylindrical lens portion 10 is provided on the other end side from the second cylindrical lens portion 12F on one end side. The light emitting unit 29 including the translucent member 93 whose height is lowered is arranged in parallel so that the second cylindrical lens portions 12E and 12F face each other. The light-emitting device 1000 shown in FIG. 14A has one fewer columns of cylindrical lenses and light-emitting element rows than the light-emitting device 800A shown in FIG. 12A, and the position of the separation region between the light-emitting units is the same as that of the light-emitting device. In the parallel direction of the cylindrical lens portion 10, it approaches one end side or the other end side from the center.

As shown in FIG. 20 and FIG. 21, a region (region surrounded by a chain line in the figure) that is equal to or higher than a threshold (for example, 3 W / cm ² ) necessary for ink curing in the light emission intensity distribution is shown in FIG. 14A. Although the light emitting device 800A in which the light emitting units 9 shown in FIG. 12A are arranged in parallel is wider than the light emitting device 1000 in which the light emitting units 9 and 29 are arranged in parallel, the peak light emission intensity is shown in FIG. 12A. The light emitting device 1000 shown in FIG. 14A is higher than the light emitting device 800A. In addition, the light emitting device 1000 in which the light emitting units 9 and 29 shown in FIG. 14A are arranged in parallel is shown in FIGS. 19 and 21, although the cylindrical lens unit 10 and the light emitting element rows are one row fewer (seven rows). As shown in the figure, an area (area surrounded by a chain line in the drawing) that is equal to or higher than a threshold value (for example, 3 W / cm ² ) necessary for ink curing in the light emission intensity distribution includes eight cylindrical lens portions 10 and light emitting element arrays. And the width of the light emission intensity distribution of the light emitting device 1200 provided integrally is substantially the same.

  Therefore, as shown in FIG. 14A, the light emitting device 1200 provided integrally and the light emitting device 800A in which the separation region between the light emitting units 9 is located approximately in the center in the parallel direction of the cylindrical lens unit 10 are used. In the light emitting device 1000 in which a plurality of units 9 and 29 are arranged in parallel, and the separation region between the light emitting units 9 and 29 is closer to one end side or the other end side from the center in the parallel direction of the cylindrical lens portion 10, the entire light emitting element array Although the number of columns is reduced from 8 to 7, there are cases where the effect of curing the ink can be made substantially the same.

(Light irradiation device)
By arranging a plurality of the light emitting devices as described above in a predetermined arrangement, the light emitting device can be used. FIG. 15 is a schematic configuration diagram of a light irradiation apparatus including the light emitting device 100 shown in FIG. FIG. 16 is a schematic configuration diagram of a light irradiation apparatus including the light emitting device 800A illustrated in FIG. 12A. FIG. 17 is a schematic configuration diagram of a light irradiation apparatus including the light emitting device 900 shown in FIG. In addition, although the light-emitting devices of the light irradiation device shown in FIGS. 15 to 17 are all shown two by two, they may be one or three or more. In the light irradiating device, the plurality of light emitting devices are mounted on a substrate or the like (not shown), and move in any direction of arrows (left and right in the drawing) shown below the light emitting devices. Similarly, the irradiated object S moves in the direction of the arrow shown on the irradiated object S. Note that the light irradiation device may be configured such that either the light emitting device or the object S to be moved moves or both move.

  The light irradiation device shown in FIG. 15 includes two light emitting devices 100, and these light emitting devices 100 are arranged in parallel so that the parallel directions of the plurality of cylindrical lens portions coincide. Further, the two light emitting devices 100 of the light irradiation device are disposed downward so that the emitted light is irradiated downward. Furthermore, this light irradiation apparatus is provided so that the relative movement direction of the plurality of light emitting devices 100 with respect to the irradiation object S is the same as the parallel direction of the plurality of cylindrical lens portions.

  The light irradiation device shown in FIGS. 16 and 17 includes two light emitting devices 800A and 900, and these light emitting devices 800A and 900 are juxtaposed so that the parallel directions of a plurality of cylindrical lens portions coincide. . Further, the two light emitting devices 800A and 900 are arranged downward so that the emitted light is irradiated downward, and the relative movement direction of the plurality of light emitting devices 800A and 900 with respect to the irradiation object S is changed. These are provided so as to be the same as the parallel direction of the plurality of cylindrical lens portions.

  As shown in FIGS. 15 to 17, by using the light emitting device having the cylindrical lens portion configured as described above as the light irradiating device, the intensity of light irradiated to the irradiated object can be changed gently. it can. Furthermore, by arranging a plurality of such light emitting devices in parallel, it is possible to repeatedly irradiate light with gradually increasing intensity, and for example, it is possible to reliably cure ink or the like.

  In the light irradiation device, light emitting elements having different emission wavelengths may be mounted for each light emitting device 100. For example, as shown in FIG. 15, of the two light emitting devices 100, the light is placed on the first light emitting device 100A disposed on the left side in FIG. The light emitting wavelengths of the plurality of light emitting elements 1 are set to 290 nm to 330 nm, and the light is applied to the irradiation object S after the first light emitting device 100A, that is, the second light emitting device 100B disposed on the right side in FIG. The light emission wavelengths of the plurality of light emitting elements to be placed can be 345 nm to 385 nm. More specifically, the emission wavelength of the plurality of light emitting elements 1 placed on the first light emitting device 100A is 310 nm, and the emission wavelength of the plurality of light emitting elements 1 placed on the second light emitting device 100B is 365 nm. be able to. With such a configuration, after the object S, more specifically the inside of the ink, is cured by the light of the first light emitting device 100A, the surface of the ink is gently moved by the light of the second light emitting device 100B. It can be cured. Therefore, it can be set as the light irradiation apparatus which can harden an ink more reliably with a light irradiation apparatus.

  15 to 17 include two light emitting devices, but the number can be changed as appropriate depending on the desired light distribution, the size of the irradiated object S, and the like. In addition, the light irradiation device may include the light emitting device in the same direction as the extending direction of the cylindrical lens unit as well as the light emitting device arranged in the same direction as the parallel direction of the plurality of cylindrical lens units.

100, 200, 300, 400, 500, 600, 700, 800A, 800B,
900, 1000, 1100, 1200 Light-emitting device 100A First light-emitting device 100B Second light-emitting device 1 Light-emitting element 2 Substrate 2A Base material 3, 23, 33, 43, 53, 63, 73, 83, 93, 103, 113 Conductive member 4 Conductive wire 5 Conductive layer 6 Light emitting element array 7 Valley 9, 29, 39 Light emitting unit 10 Cylindrical lens part 10a Columnar part 10b Curved part 10c Flat part 11, 11A, 11B, 11C, 11D, 11E, 11F, 11G 1st cylindrical lens part 12,12A, 12B, 12C, 12D, 12E, 12F 2nd cylindrical lens part 13 Connection part 16 Recessed part 18 Hole 19 Fixing tool S Irradiated object

Claims (17)

A substrate,
A plurality of light emitting elements mounted on the substrate to form three or more light emitting element rows;
A translucent member in which three or more rows of cylindrical lens portions are arranged in parallel so as to be arranged on each of the light emitting element rows,
The light emitting element rows are provided at substantially equal intervals,
The plurality of cylindrical lens portions are provided in the parallel direction in a first cylindrical lens portion including at least rows at both ends and on the inner side of the first cylindrical lens portion, and the height of the plurality of cylindrical lens portions is highest. A light emitting device having a high second cylindrical lens unit.   The light emitting device according to claim 1, wherein the second cylindrical lens unit is provided at a central portion in a parallel direction of the cylindrical lens unit. The light emitting element row is an odd number row of 5 or more,
3. The light emitting device according to claim 1, wherein the second cylindrical lens unit includes a central column in the parallel direction of the cylindrical lens unit and at least one column on both sides thereof. The light emitting element rows are even rows of 6 or more,
3. The light emitting device according to claim 1, wherein the second cylindrical lens unit includes a row that forms a valley located in the center in the parallel direction of the cylindrical lens unit, and at least one row that is adjacent to the row.   5. The light emitting device according to claim 1, wherein the cylindrical lens portion is provided such that a height thereof decreases from the second cylindrical lens portion toward the outside in the parallel direction thereof. 6.   6. The light emitting device according to claim 1, wherein the cylindrical lens portion is provided so that a height thereof is symmetrical with respect to a center in a parallel direction thereof.   The light-emitting device according to claim 1, wherein the plurality of light-emitting elements in the light-emitting element array are respectively mounted at substantially equal intervals. A light emitting device comprising a plurality of light emitting units arranged in parallel,
The light emitting unit is
A substrate,
A plurality of light emitting elements mounted on the substrate and forming a plurality of light emitting element arrays in a direction in which the light emitting units are arranged;
A translucent member in which a plurality of cylindrical lens portions are arranged in parallel so as to be arranged on each of the light emitting element rows,
The cylindrical lens portions of the light emitting device are three or more rows in total,
The cylindrical lens unit is provided in the parallel direction with a first cylindrical lens unit including at least rows at both ends, and on the inner side of the first cylindrical lens unit, and the plurality of cylindrical lens units having the highest height A light emitting device having two cylindrical lens portions. The light emitting unit includes the second cylindrical lens portion on one end side in the parallel direction of the cylindrical lens portion,
The light emitting device according to claim 8, wherein the two light emitting units are arranged side by side so that the second cylindrical lens portions face each other.   The light emitting device according to claim 1, wherein the plurality of light emitting elements emit ultraviolet light.   The light emitting device according to any one of claims 1 to 10, wherein a lower end side of the adjacent cylindrical lens portions is connected.   The light emitting device according to claim 1, wherein the adjacent cylindrical lens portions are separated from each other.   The light emitting device according to any one of claims 1 to 12, wherein the cylindrical lens portion has a substantially semi-elliptical cross section. A light irradiation device comprising a plurality of the light emitting devices according to any one of claims 1 to 13, and irradiating an irradiated object with light emitted from the plurality of light emitting devices,
The light emitting device is juxtaposed in the same direction as the parallel direction of the plurality of cylindrical lens portions,
The light irradiation device in which a relative movement direction of the plurality of light emitting devices with respect to an irradiation object is the same as a parallel direction of the plurality of cylindrical lens units.   The light irradiation apparatus according to claim 14, wherein a light emitting element having a different emission wavelength is placed for each light emitting apparatus.   A first light emitting device provided at a position where the emitted light is irradiated on the irradiated object first; a second light emitting device provided at a position where the emitted light is irradiated on the irradiated object after the first light emitting device; The light emitting wavelengths of the plurality of light emitting elements placed on the first light emitting device are 290 nm to 330 nm, and the light emitting wavelengths of the plurality of light emitting elements placed on the second light emitting device are 345 nm to The light irradiation apparatus according to claim 15 which is 385 nm. A substrate,
A plurality of light emitting elements mounted on the substrate and forming a plurality of light emitting element rows;
A translucent member in which a plurality of cylindrical lens portions are arranged in parallel so as to be arranged on each of the light emitting element rows,
The light emitting element rows are provided at substantially equal intervals,
The plurality of cylindrical lens units include a first cylindrical lens unit and a second cylindrical lens unit having different heights,
The second cylindrical lens unit is the light emitting unit having the highest height among the plurality of cylindrical lens units and provided at one end in the parallel direction of the plurality of cylindrical lens units.