JP6703731B2 - Light emitting device, light irradiation device including the light emitting device, and light emitting unit - Google Patents

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 mounted on a substrate and a translucent sealing member in which a plurality of semi-cylindrical cylindrical lenses are arranged in series are provided on a light emitting element row formed of a plurality of light emitting elements. There is known a light emitting device provided with a semi-cylindrical cylindrical lens portion arranged therein.

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

JP-A-63-276287

However, when the ink, resin, or the like is suddenly exposed to strong ultraviolet light as described above, only the surface of the ink may be cured, and the interior may not be sufficiently cured. Therefore, there is a demand for a light emitting device in which the slope of the light intensity distribution curve changes gently so that strong light is unlikely to hit the object to be irradiated all at once.

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

A light emitting device according to an embodiment of the present invention includes a substrate, a plurality of light emitting elements mounted on the substrate to form three or more light emitting element rows, and arranged on the light emitting element row, respectively. A light-transmitting member in which three or more columns of cylindrical lens sections are arranged in parallel, the light emitting element rows are provided at substantially equal intervals, and the plurality of cylindrical lens sections are arranged at least at both ends in the parallel direction. A first cylindrical lens portion including a row, and a second cylindrical lens portion that is provided inside the first cylindrical lens portion and has the highest height in the plurality of cylindrical lens portions.

Further, the light emitting device according to the embodiment of the present invention is configured by arranging a plurality of light emitting units side by side, the light emitting unit is mounted on the substrate and the substrate, and a plurality of light emitting units are disposed in a side by side arrangement direction. A plurality of light emitting elements forming a light emitting element row, and a translucent member in which a plurality of cylindrical lens portions are arranged in parallel so as to be respectively arranged on the light emitting element row, and the cylindrical lens of the light emitting device. The number of the sections is three or more in total, and the cylindrical lens section is provided inside the first cylindrical lens section including at least the rows at both ends in the parallel direction and inside the first cylindrical lens section. A second cylindrical lens portion having the highest height in the cylindrical lens portion.

A light irradiating device according to an embodiment of the present invention is a light irradiating device including a plurality of the light emitting devices, and irradiating an object to be irradiated with light emitted from the plurality of light emitting devices, wherein the light emitting device is the plurality of cylindrical The light emitting devices are arranged side by side in the same direction as the parallel direction, and the relative movement direction of the plurality of light emitting devices with respect to the irradiation target is the same as the parallel direction of the plurality of cylindrical lens units.

A light emitting unit according to an exemplary embodiment of the present invention includes a substrate, a plurality of light emitting elements mounted on the substrate to form a plurality of light emitting element rows, and a plurality of light emitting elements arranged on the light emitting element row. And a translucent member in which the cylindrical lens portions are arranged in parallel, the light emitting element rows are provided at substantially equal intervals, and the plurality of cylindrical lens portions include a first cylindrical lens portion and a first cylindrical lens portion having different heights. And a second cylindrical lens portion, wherein the second cylindrical lens portion has the highest height in the plurality of cylindrical lens portions, and is provided at one end of the plurality of cylindrical lens portions in the parallel direction. There is.

According to the light emitting device having the above configuration, in a light emitting device having a light-transmissive member in which a plurality of cylindrical lens units 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 units is gently changed. be able to. Further, according to the light irradiation device having the above configuration, it is possible to gently change the intensity of the light with which the irradiation target is irradiated.

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. FIG. 3A is a schematic sectional view taken along line IIIA-IIIA of the light emitting device shown in FIG. 1. FIG. 3B shows a light intensity distribution curve of the light emitting device in the schematic sectional view shown in FIG. 3A. FIG. 4 is a schematic sectional view taken along line IV-IV of the light emitting device shown in FIG. 3A. FIG. 5 is a schematic 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 sectional view of a light emitting device according to the seventh embodiment. FIG. 12A is a schematic sectional view of a light emitting device according to an eighth embodiment. FIG. 12B is a schematic cross-sectional view of the light emitting device according to the eighth embodiment. FIG. 13 is a schematic sectional view of a light emitting device according to the ninth embodiment. FIG. 14A is a schematic cross-sectional view of a light emitting device according to the tenth embodiment. FIG. 14B is a schematic sectional view of a light emitting device according to the eleventh embodiment. FIG. 15 is a schematic configuration diagram of a light irradiation device including the light emitting device shown in 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 a light emitting device. 18B is a schematic sectional view taken along line XVIIIB-XVIIIB of the light emitting device shown in FIG. 18A. FIG. 19 shows a light radiation intensity distribution in the light emitting device shown in FIG. 18A. 20 shows a light radiation intensity distribution in a plan view of the light emitting device shown in FIG. 12A. FIG. 21A shows a light radiation intensity distribution in a 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. The dimensions, shapes, positional relationships, etc. of the members shown in the drawings may be exaggerated for clarity of explanation. Further, in the following description, the same names and reference numerals basically indicate the same or similar members, and detailed description thereof will be appropriately omitted. The embodiments described below can be applied by appropriately combining the respective configurations and the like.

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

The light emitting device 100 includes a substrate 2, a plurality of light emitting elements 1 mounted on the substrate 2 and forming three or more light emitting element rows 6, and three rows of light emitting elements 1 arranged on each of the light emitting element rows 6. The translucent member 3 in which the above cylindrical lens portions 10 are arranged in parallel is provided. In the light emitting device 100 of the first embodiment, 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. In addition, a light-transmissive member 3 in which six columns of cylindrical lens portions 10 are arranged in parallel is provided. In addition, in the present specification, “substantially equal intervals” includes minute things with a difference of 2.0 mm or less.

In the parallel direction, the plurality of cylindrical lens portions 10 are provided inside the first cylindrical lens portion 11 including rows at both ends and inside the first cylindrical lens portion 11, and the height of the plurality of cylindrical lens portions 10 is the highest. And a second high cylindrical lens portion 12. In the first embodiment, as shown in FIGS. 2 and 3A, a total of four rows, that is, the rows at both ends of the plurality of cylindrical lens portions 10 in the parallel direction and the inside rows adjacent to the rows at both ends are the first cylindrical lens portions. 11A and 11B. Further, the two columns of the central portion, which is provided inside the first cylindrical lens portions 11A and 11B and has the highest height in the plurality of cylindrical lens portions 10, are the second cylindrical lens portions 12A. When the translucent member 3 having such a shape is provided, for example, compared with a 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 in parallel, a plurality of cylindrical lens portions are arranged in parallel. The slope of the light intensity distribution curve in the direction can be gently changed.
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 provides a light emitting device having a desired light distribution characteristic. 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) thereof, and adjacent cylindrical A valley 7 is formed between the lens portions 10. In this way, since the plurality of arrayed cylindrical lens portions 10 are integrally provided by the connecting portion 13 that connects them, compared to the case where the plurality of cylindrical lens portions 10 are provided separately, 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 a valley 7 located at the center of the plurality of cylindrical lens portions 10 in the parallel direction when the cylindrical lens portions 10 are an even number of three or more rows. When the cylindrical lens unit 10 is an odd-numbered column having three or more columns, it means the column located at the center in the parallel direction of the plurality of cylindrical lens units 10. The translucent member 3 may have, in addition to the plurality of cylindrical lens portions 10, a collar portion that spreads outward from the lower end portion of the cylindrical lens portion.

(Cylindrical lens part 10)
In the present specification, the cylindrical lens unit 10 refers to a plano-convex type lens including 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 portions 10 are juxtaposed in a direction perpendicular to the extending direction in plan view. In addition, 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 so that the respective cylindrical lens portions 10 are respectively arranged on the light emitting element rows 6 in which the plurality of light emitting elements 1 are arranged. Since the light emitting element rows 6 are provided on the substrate 2 in at least three rows or more, the cylindrical lens portion 10 is also provided in at least three rows or more. In the first embodiment, the cylindrical lens portion 10 is arranged such that the top thereof is located substantially on the center of the light emitting surface of the light emitting element 1.

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

It is generally known that the higher the height (h) of the cylindrical lens portion, the higher the directivity of the light emitted from the light emitting element. The mechanism by which the cylindrical lens portion 10 having a high height (h) has higher directivity than that of a cylindrical lens portion having a low height will be described below.

In the first embodiment, as shown in FIG. 3A, the height (a) is increased without changing the diameter (b) of the cylindrical lens portion 10 having a substantially semi-elliptical cross section, so that the second cylindrical lens portion is formed. The height of 12 is made higher than that of the first cylindrical lens portion 11. As a result, the radius of curvature of the curved portion on the upper end side of the second cylindrical lens portion 12 becomes 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 As compared with the cylindrical lens portion 11, the light condensing action is higher.
Further, when the height (h) of the cylindrical lens portion 10 is high, the light condensing action can be enhanced even in the extending direction of the cylindrical lens portion 10. 4 and 5, in the extending direction of the cylindrical lens portion 10, the direction of travel of the light emitted from the light emitting element 1 at the irradiation angle α is schematically indicated by an arrow. As shown in the figure, the light transmitted through the first cylindrical lens portion 11B having a low height shown in FIG. 5 is compared with the light transmitted through the second cylindrical lens portion 12A having a high height shown in FIG. , The diffusing effect is increased as the lens interface is closer. Therefore, in the cylindrical lens portion 10, the higher the height (h) is, the more easily the light diffusion action is suppressed in the extending direction.

As described above, the second cylindrical lens has the function of condensing light due to the smaller radius of curvature on the upper end side of the cylindrical lens portion 10 and the effect of suppressing the diffusion of light due to the height of the cylindrical lens portion 10. The directivity of the portion 12 is higher than the directivity of the first cylindrical lens portion 11.

The second cylindrical lens portion 12 is preferably provided in the central portion in the parallel direction of the plurality of cylindrical lens portions 10. In the present specification, the "central portion" is such that the total length of the plurality of cylindrical lens portions 10 in the parallel direction is 100, one end side is 0, and the other end side is 100. It refers to the region of 40 to 60. More specifically, when the cylindrical lens portion 10 has three rows, the "central portion" is the central row, and when the cylindrical lens portion 10 is an odd row of five rows or more, the "central portion" is the central row and both sides thereof. A column including at least one of the columns. Further, when the cylindrical lens portion 10 has four rows, the “central portion” is two rows that form a valley located at the center, and when the cylindrical lens portion 10 is an even row of six rows or more, the “central portion” is at the center. It is a row that includes two rows forming a located valley and at least one row on both sides thereof. 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 in the central 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 columns of cylindrical lens portions 10, and is adjacent to both ends and both ends of the six columns of cylindrical lens parts 10. A total of four rows are the first cylindrical lens portions 11, and the inner two rows thereof, that is, the row forming the central valley 7 of the plurality of cylindrical lens portions 10 has a height in the plurality of cylindrical lens portions 10. It is the highest second cylindrical lens portion 12.

In the translucent member 3 shown in FIG. 3A, the height (h1) of the second cylindrical lens portion 12A is the highest, and the height (h3) of the first cylindrical lens portions 11B at both ends is the lowest. Further, the height of the first cylindrical lens portion 11 is set such that the height gradually decreases from the second cylindrical lens portion 12 toward the outside. The heights of the first cylindrical lens portion 11 and the second cylindrical lens portion 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 first cylindrical lens unit 11 and the second cylindrical lens unit 12 can be, for example, 0.1 mm to 4.0 mm. Further, in the first embodiment, for example, the height of the cylindrical lens portion 10 can be set to be lower by 0.1 mm from the second cylindrical lens portion 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 portion 11B. It can be set to be 0.1 mm lower than the height of the portion 11A. With such a configuration, as shown in FIG. 3B, as compared with the light intensity distribution curve of the light emitting device having the light transmissive member having a shape in which a plurality of cylindrical lens portions having substantially the same height are arranged in parallel, It is possible to obtain the light emitting device 100 in which the slope of the intensity distribution curve changes gently and the light intensity increases near the central portion. The graph shown in FIG. 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. 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 3 shows a light intensity distribution curve of a light emitting device having a translucent member 3 having a size of 0.5 mm.

Furthermore, the heights of the plurality of cylindrical lens portions 10 shown in FIG. 3A are symmetrical with respect to the center (valley 7 of the center in the first embodiment) in the parallel direction. That is, the heights (h1) of the two rows of the second cylindrical lens portions 12A provided in the central portion are substantially equal to each other, and the heights of the left and right two rows of the first cylindrical lens portions 11A provided on both sides of the second cylindrical lens portion 12A are the same. (H2) are substantially equal to each other, and the heights (h3) of the first cylindrical lens portions 11B on both adjacent columns, that is, the two columns on the left and right provided at both ends are substantially equal. As described above, when the heights of the plurality of cylindrical lens units 10 are symmetrical with respect to the center in the parallel direction, the light intensity distribution curve of the light emitting device 100 in the parallel direction of the cylindrical lens units 10 should be symmetrical. You can The heights of the plurality of cylindrical lens units 10 may be left-right asymmetrical with respect to the center in the parallel direction to achieve 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, moldability, and the like. The translucent member 3 can be provided by compression molding, transfer molding, casting molding, or the like. For example, a 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 having a recess, 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 row and cured to form the light emitting element row.

Here, it is possible to prevent the occurrence of voids in the light-transmissive member 3 by adjusting the unevenness of the surface of the substrate 2, the viscosity of the resin at the time of injection, the temperature, the injection pressure, and the like. By ensuring a sufficient space between the plurality of light emitting elements 1 on the substrate 2, it is possible to improve the fluidity of the transparent member 3 to be injected and suppress the generation of voids. Further, as a pre-process of 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. Methyl ethyl ketone (MEK) or the like can be used as the organic solvent.

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

The light emitting device 1 of the first embodiment has 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 by a conductive adhesive or the like. Examples of the conductive adhesive include solder such as Au-Sn and Au-In. Further, the upper surface 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 surface electrode is connected. In the light emitting element 1 shown in FIG. 2, an electrode is provided in the central portion of the upper surface, and this electrode and the conductive layer 5 are connected by a single conductive wire 4. However, the invention is not limited to this. The position, the number of electrodes and conductive wires, and the like can be changed as appropriate. The light-emitting element may have positive and negative electrodes provided on the same surface, the surface having the electrodes may be bonded to the conductive layer 5 with a conductive adhesive, or the surface opposite to the surface having the electrodes. The surface may be connected to the conductive layer 5 by an insulating adhesive, and each electrode 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, for example, 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 appropriately selected. For example, as an 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, a plurality of light emitting elements 1 are arranged in a line to form at least three or more light emitting element rows 6, and a plurality of light emitting element rows 6 are arranged in a matrix. There is. In FIG. 2, twelve light emitting elements 1 are mounted on one light emitting element row 6, and six light emitting element rows 6 are provided. Therefore, the light emitting device 100 includes 72 light emitting elements 1. However, not limited to this, the arrangement pattern of the light emitting elements 1, the number of the light emitting elements 1, and the number of the light emitting element rows 6 can be appropriately changed. Further, in the first embodiment, the light emitting elements 1 of the light emitting element row 6 are mounted at substantially equal intervals, and the light emitting element rows 6 are arranged at substantially equal intervals. It is preferable to provide the light emitting elements 1 and the light emitting element rows 6 at substantially equal intervals in this manner, because the light emitting elements 1 can be easily placed.

The plurality of light emitting elements 1 shown in FIG. 2 are connected in 12 series and 6 parallel via the conductive layer 5 and the conductive wire 4. However, the connection pattern is not limited to this, and can be changed as appropriate. Further, 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 portion 10 are provided so as to coincide with each other. By doing so, it is easy to provide so that the valley 7 where the thickness of the translucent member 3 is relatively thin and the connecting portion of the conductive wire 4 and the conductive layer 5 connected to the light emitting element 1 do not overlap. Therefore, external stress is unlikely to be applied to the connecting portion, and the disconnection of the conductive wire 4 can be suppressed.

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

Examples of the material of the base material 2A include insulating materials such as ceramics, resin, and glass. Particularly, ceramics, which are inorganic materials, are preferable from the viewpoint of heat dissipation. As ceramics, AlN having a particularly high heat dissipation property 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 of a material known in the art. For example, Cu, Ni, Pd, W, Cr, Ti, Al, Ag, Au or alloys thereof can be used. In particular, Cu or Cu alloy is preferable from the viewpoint of heat dissipation. The surface of the conductive layer 5 may be coated with Ag, Pt, Sn, Au, Cu, Rd, an alloy thereof, or an oxide film. The conductive layer 5 may be formed by a known method such as plating, sputtering, or a lead frame may be used, and a base material such as resin may be molded 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 mounted. The conductive wire 4 is a metal wire and is connected so as to form a predetermined loop shape. The material of the conductive wire 4 may be Au, for example.

In addition, the light emitting device 100 may include electronic components 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, it is possible to provide the light emitting device 100 having high driving reliability.

(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 transparent member 23 is different from the shape of the transparent member 3 of the first embodiment shown in FIG. 3A. The translucent member 23 shown in FIG. 6 has a shape in which six columns of cylindrical lens portions 10 are connected by a connecting portion 13 as in the case of the translucent member 3 of the first embodiment. The row is the second cylindrical lens portion 12B that is the highest in the plurality of cylindrical lens portions 10. Further, a total of four rows, two left and two rows on the outside of 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 heights (h3) of the first cylindrical lens portions 11D in the two rows at the two ends of the plurality of cylindrical lens portions 10 are the lowest, and the second cylindrical lens portions 12 face outward. The height of the cylindrical lens portion 10 is gradually decreasing. Further, the heights of the plurality of cylindrical lens portions 10 shown in FIG. 6 are symmetrical with respect to the center in the parallel direction (the middle valley in the second embodiment). That is, the heights (h1) of the two rows of the second cylindrical lens portions 12B provided in the central portion are substantially equal, and the heights of the two rows of the first cylindrical lens portions 11C provided on both sides of the second cylindrical lens portion 12B ( h2) are substantially equal, and the heights (h3) of the outer columns of the first cylindrical lens portions 11C, that is, the first cylindrical lens portions 11D provided at both ends of the plurality of cylindrical lens portions 10 are substantially equal.

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

In the plurality of cylindrical lens portions 10 of the second embodiment, since the curved portions 10b have the same radius of curvature, there is little difference in directivity in this portion, but the columnar portion 10a of the second cylindrical lens portion 12B is replaced by the first cylindrical lens portion. By making the height higher than that of the columnar portions 10a of 11C and 11D, the light of the light emitting element 1 is efficiently reflected to the curved portion 10b side, and the directivity of the second cylindrical lens portion 12B is made higher than that of the first cylindrical lens portions 11C and 11D. It is higher than directivity.

Further, similarly to the above description, the height of the second cylindrical lens portion 12B is higher than the height of the first cylindrical lens portions 11C and 11D, so that the diffusion of the light is suppressed. 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 portion 10a of the cylindrical lens portion 10 can be provided, and the directivity of the second cylindrical lens portion 12 can be enhanced. However, in the translucent member 23 shown in FIG. 6, the columnar parts 10a of the adjacent cylindrical lens parts 10 may be provided so as to be in contact with each other.
As described above, by providing the translucent member 23 in which the height of the first cylindrical lens portion 11 is set so that the height gradually decreases from the second cylindrical lens portion 12 toward the outside, a plurality of transparent 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 units 10 can be gently 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 of the third embodiment, the shape of the translucent member 33 is different from the shape of the translucent member of the first and second embodiments. Specifically, the translucent member 33 of the light emitting device 300 of the third embodiment includes an odd number of columns, here, five columns of the cylindrical lens portions 10, and the five columns of the cylindrical lens portions 10 are connected by the connecting portion 13. It is a shaped shape. Of the five columns of the cylindrical lens section 10, the central column is the highest second cylindrical lens section 12C, and the outer two rows, two rows each on the left and right, are the first cylindrical lens sections 11A and 11B. In the translucent member 33 shown in FIG. 7, the first cylindrical lens portions 11B in the two rows at both ends of the cylindrical lens portions 10 in the five rows are the lowest, and the cylindrical lens portions 10 are outwardly directed from the second cylindrical lens portion 12C. The height of 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 which is the central row. That is, the heights of the two columns of the first cylindrical lens portions 11A provided on both sides of the second cylindrical lens portion 12C are substantially the same, and the outer columns of the first cylindrical lens portion 11A, that is, the both ends of the plurality of cylindrical lens portions 10 are arranged. The heights of the first cylindrical lens portions 11B, which are the rows, are substantially equal.

Further, the second cylindrical lens portion 12C of the third embodiment has the flat portion 10c on the upper end side thereof. The first cylindrical lens portion 11 may have a flat portion on the upper end side, or both cylindrical lens portions 10 may have a flat portion on the upper end side.
As described above, by providing the translucent member 33 in which the height of the first cylindrical lens portion 11 is set so that the height gradually decreases from the second cylindrical lens portion 12 toward the outside, a plurality of transparent 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 units 10 can be gently 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. 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 according to the fourth embodiment also has the cylindrical lens units 10 in five rows as in the third embodiment. The upper end side of the five-row cylindrical lens portion 10 of the fourth embodiment is a curved surface and is the second cylindrical lens portion 12A having the highest height in the central 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 they are all substantially equal in height.
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 portions 10 can be gently changed, and the plurality of cylindrical lenses can be formed. The light intensity distribution curve of the light emitting device 400 in the direction in which the parts 10 are arranged in parallel can be formed into a pointed shape.

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

(Embodiment 6)
FIG. 10 is a schematic sectional view of a light emitting device 600 according to the sixth embodiment. In Embodiments 1 to 5, the translucent member directly covers the light emitting element 1 on the substrate 2. However, the present invention is not limited to this, and a mode having a space between the translucent member and the light emitting element 1 May be The light-transmissive member that directly covers the light emitting element 1 can be provided by, for example, molding using a mold, but in the sixth embodiment, as shown in FIG. 10, the light emitting element 1 can be stored in advance on the lower surface. A transparent member 63 provided with such a concave portion 16 is prepared, and placed on the substrate 2 so that the light emitting elements 1 on the substrate 2 are housed. By providing the translucent member 63 in this manner, the translucent member 63 and the light emitting element 1 can be separated from each other, so that the translucent member is prevented from being deteriorated by light or heat of the light emitting element 1. be able to. In addition, by mounting the translucent member prepared in advance on the substrate, as compared with the case where the translucent member is directly molded on the substrate 2 on which the light emitting element 1 is mounted, the substrate 2 and the light emitting element 1 are It is possible to reduce the influence of heat on the. 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 the light emitting device 700 according to the seventh embodiment. As shown in FIG. 11, the translucent member 73 of the light emitting device 700 of the seventh embodiment has a plurality of adjacent cylindrical lens portions 10 spaced apart from each other and arranged side by side, and does not have a connecting portion. Specifically, the cylindrical lens portion 10 of the seventh embodiment has a curved portion 10b on the upper end side and a columnar portion 10a below the curved portion 10b. In addition, the two columns arranged in the central portion of the six columns of the cylindrical lens portions 10 are the second cylindrical lens portions 12D that are the highest among the plurality of cylindrical lens portions 10. Further, a total of four rows, two rows each on the left and right outside the second cylindrical lens section 12D, are the first cylindrical lens sections 11E and 11F. In the translucent member 73 shown in FIG. 7, the height of the first cylindrical lens portions 11F in the two rows at both ends of the plurality of cylindrical lens portions 10 is the lowest, and the cylindrical lens portions 12D face outward from the second cylindrical lens portion 12D. The height of 10 is gradually decreasing. 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 to each other, the heights of the two rows of the first cylindrical lens portions 11E provided on both sides thereof are substantially equal to each other, and the heights of the outer rows, that is, 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 portion 11 is set so that the height gradually decreases from the second cylindrical lens portion 12 toward the outside, a plurality of transparent 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 units 10 can be gently changed, and the plurality of adjacent cylindrical lens units 10 are spaced apart from each other and arranged in parallel, so that the light emitting device is arranged. It is possible to form a plurality of valleys in the light intensity distribution curve of.
Note that, although FIG. 11 shows the light emitting device 700 having the translucent member 73 in which a plurality of the cylindrical lens portions 10 having the columnar portion 10a at the lower end side are spaced apart and arranged in parallel, for example, a cross section as shown in FIG. 3A. As a translucent member in which a plurality of cylindrical lens portions 10 having a substantially semi-elliptical shape are spaced apart and arranged in parallel (that is, the translucent member 3 shown in FIG. 3A does not have the connecting portion 13). Good.

In Embodiments 1 to 7 described above, a light emitting device that includes six rows of cylindrical lens portions and has a light-transmissive member in which two rows adjacent to each other in the central valley are the second cylindrical lens portions 12, or five rows of cylindrical lenses. Although the light-emitting device having the light-transmitting member including the portion and the central column having the second cylindrical lens portion 12 is shown, the number of rows of the cylindrical lens portion is not particularly limited as long as it is three or more. Further, in the translucent member including the six cylindrical lens portions, the two columns adjacent to both sides of the central valley and the rows adjacent to both sides may be used as the second cylindrical lens portion 12. Further, in the translucent member including the five cylindrical lens portions, a total of three rows including the central row and the rows adjacent to the central row may be the second cylindrical lens sections 12.

(Embodiment 8)
FIG. 12A is a schematic sectional view of a light emitting device 800A according to the eighth embodiment. In the eighth embodiment, the light emitting units 9 are arranged side by side to form one light emitting device 800A. 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 a light emitting element row 6, and a cylindrical lens arranged on the light emitting element row 6 respectively. A translucent member 83 having the portion 10. The plurality of light emitting element rows 6 of the light emitting unit 9 according to the eighth embodiment are provided in the same direction as the juxtaposed direction of the light emitting units 9.

The light transmissive member 83 of each light emitting unit 9 shown in FIG. 12A includes four rows of cylindrical lens portions 10, and the highest height cylindrical lens portion 10 on one end side in the parallel direction. The height is gradually reduced 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 side by side 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. There is. Therefore, the light emitting device 800A in which the two light emitting units 9 are arranged side by side has a total of eight rows of the cylindrical lens portions 10, and the two rows of the cylindrical lens portions 10 facing each other of the light emitting units 9 are the second. It is the cylindrical lens portion 12E, and the cylindrical lens portions 10 on a total of 6 rows outside thereof are the first cylindrical lens portions 11G, 11A, and 11B. In the eighth embodiment, the heights of the eight rows of the cylindrical lens units 10 of the light emitting device 800A are symmetrical with respect to the space between the light emitting units 9.

As described above, when the heights of the plurality of cylindrical lens portions 10 are symmetrical with respect to the center in the parallel direction, the light intensity distribution curves of the light emitting device 800A in the parallel direction of the cylindrical lens portions 10 are symmetrical. can do. In the light emitting device 800A of the eighth embodiment, the light emitting units 9 having the same shape of the light transmissive member 83 are arranged side by side so that the second cylindrical lens portions 12E face each other, so that the height relationship is left and right with respect to the center. The light emitting device 800 having the symmetrical transparent member 83 can be easily provided. The heights of the plurality of cylindrical lens portions 10 of the light emitting device may be laterally asymmetric 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 columns 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 suffices to have three or more columns including the cylindrical lens portions. FIG. 12B is a schematic sectional view of a light emitting device 800B according to the eighth embodiment. In the light emitting device 800B shown in FIG. 12B, the translucent member 103 of each light emitting unit 39 includes two columns of the cylindrical lens portions 10, and the light emitting device 800B has a total of three columns or more (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, one of the cylindrical lens portions 10 in the two rows has a high height (the second cylindrical lens portion 12) and the other cylindrical lens portion (the first cylindrical lens portion 11) has a high height. ) Is lower than that. The light emitting device 800B is provided by arranging the two light emitting units 39 in parallel so that the second cylindrical lens portions 12 face each other.

In the eighth embodiment, the light emitting device in which two light emitting units are arranged side by side is shown, but the light emitting device may include three or more light emitting units arranged in parallel. For example, three light emitting units having a translucent member having one row of cylindrical lens portions are prepared, and the light emitting unit having the highest cylindrical lens portion is arranged in the middle of the three light emitting units, and the other 2 A light emitting device can be provided by arranging two light emitting units on both sides thereof. As described above, the 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, the number of light-emitting element rows and the number of cylindrical lens portions of each light-emitting unit, in various ways. Can be used as the light emitting device.

In the light emitting devices 800A and 800B shown in FIGS. 12A and 12B, since the light emitting units have the first cylindrical lens portion 11 and the second cylindrical lens portion 12, respectively, the light intensity distribution curves of the light emitting devices 800A and 800B in the parallel direction are shown. The inclination of can be changed relatively gently. Further, since the two light emitting units are arranged side by side so that the second cylindrical lens portions 12 are opposed to each other, a convex portion is formed near the center in the light intensity distribution curve of the light emitting device in the arrangement direction of the light emitting units. It is possible to form.

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

In this light emitting device 900, since the light emitting unit 9 has the first cylindrical lens portion 11 and the second cylindrical lens portion 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. Further, 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. It is possible to form two protrusions in the light intensity distribution curve of the device.

In the ninth embodiment, a light emitting device showing a light intensity distribution curve having three or more convex portions may be provided by using three or more light emitting units. Further, 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 that are arranged in parallel.

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

In the present specification, the term “end” of the plurality of cylindrical lens portions in the parallel direction means that the total length of the plurality of cylindrical lens portions 10 in the parallel direction is 100, one end side is 0, and the other end side is 100. The region of 0 to 20 or 80 to 100 at both ends is to be referred to. Specifically, when the cylindrical lens unit 10 has 3 to 5 rows, the “end” is at least one of the rows at both ends, and when the number is 6 or more, the “end” is at both ends. A column including 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 arranged at 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 second cylindrical lens portion having the highest height in one light emitting unit does not necessarily have the highest height in the light emitting device. Further, the number of rows of the cylindrical lens portions of the light emitting units arranged in parallel may not be the same. Such an example is shown below.

(Embodiment 10)
FIG. 14A is a schematic cross-sectional view of a light emitting device 1000 according to the tenth embodiment and shows an example in which light emitting units having different numbers of columns 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 light-transmissive member 83 having four rows of cylindrical lens portions 10, and has a second cylindrical lens portion 12E having the highest height at one end. In addition, the first cylindrical lens portions 11G, 11A, 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 light-transmissive member 93 having three columns of cylindrical lens portions 10, a second cylindrical lens portion 2F having the highest height at one end, and 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 light emitting unit 29 on the right side is lower than the height of the second cylindrical lens portion 12E of the light emitting unit 9 on the left side.

In the light emitting device 1000 of FIG. 14A, two light emitting units 9 and 29 are arranged side by side 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, but the second cylindrical lens portion 12F of the light emitting unit 29 does not emit light. In 1000, since the height is lower than that of the second cylindrical lens portion 12E of the light emitting unit 9, it functions as the first cylindrical lens portion 11G.

The light emitting device 1000 shown in FIG. 14A is configured by seven columns of cylindrical lens portions 10 as a whole, and is substantially left-right symmetric with respect to the second cylindrical lens portion 12E that is the central row. In this light emitting device 1000, 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 the light intensity distribution curve in the parallel direction of the cylindrical lens portions 10 is convex near the center. It is possible to form a part.

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

This light emitting device 1100 is composed of seven columns of cylindrical lens sections 10 as a whole, and the cylindrical lens sections are arranged from the left side to the right side (or the right side to the left side) of the figure with the second cylindrical lens section 12E being the central row interposed therebetween. The height of is high (or low). In this light emitting device 1100, the gradient of the light intensity distribution curve in the parallel direction of the plurality of cylindrical lens portions 10 can be gently changed, and two convex portions having different heights can be formed.

As shown in FIGS. 12A to 14B of Embodiments 8 to 11, a light emitting device in which a plurality of light emitting units are arranged in parallel and a light emitting element that emits ultraviolet light is mounted is shown in, for example, FIG. 3A. In some cases, it may be easier to cure the ink or the like more reliably than the integrated light emitting device 100. The reason will be described below.

FIG. 18A is a schematic plan view of the light emitting device 1200. 18B is a schematic cross-sectional view taken along line XVIIIB-XVIIIB of light emitting device 1200 shown in FIG. 18A. In the light emitting device 1200 shown in FIGS. 18A and 18B, eight rows of light emitting element rows 6 are provided on the substrate 2 at substantially equal intervals, and eight rows of cylindrical light emitting elements are arranged on each of the light emitting element rows 6. It has a transparent member 113 in which the lens units 10 are arranged in parallel. The light emitting device 1200 is not a form in which the light emitting units are arranged in parallel, but is a light emitting device integrally provided. 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. 12A of the eighth embodiment are connected. 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 at the center of the cylindrical lens portion in the parallel direction. The other points are substantially the same, and detailed description thereof will be omitted.

FIG. 19 shows a light radiation intensity distribution in the light emitting device 1200 shown in FIG. 18A. 20 shows a light radiation intensity distribution in a plan view of the light emitting device 800A shown in FIG. 12A. As shown in FIGS. 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, a region (a region surrounded by a chain line in the drawing) equal to or larger than a threshold value (for example, 3 W/cm ² ) necessary for curing the ink is in the light emitting device 800A in which the light emitting units 9 shown in FIG. 12A are arranged in parallel. Is getting wider. Therefore, as compared with the case where the light emitting device provided integrally is used, when the light emitting device in which a plurality of light emitting units are arranged in parallel is used, the ink curing reaction takes a longer time, and the ink is reliably cured. There is.

21 shows a light radiation intensity distribution in a 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 cylindrical lens portions 10 and the second cylindrical lens portion 12E having the highest height at one end side, and from one end side to the other end side. The light emitting unit 9 having the translucent member 83 having a height of the cylindrical lens portion 10 and the cylindrical lens portions 10 in three rows are provided, and the second cylindrical lens portion 12F on one end side to the cylindrical lens portion 10 on the other end side. And the light emitting unit 29 including the light transmissive member 93 whose height is low are arranged side by side so that the second cylindrical lens portions 12E and 12F thereof face each other. The light emitting device 1000 shown in FIG. 14A has one less number of columns of the cylindrical lens portion and the light emitting element column than the light emitting device 800A shown in FIG. 12A, and the position of the space between the light emitting units is different from that of the light emitting device. In the parallel direction of the cylindrical lens portions 10, they are located closer to one end side or the other end side from the center.

As shown in FIGS. 20 and 21, a region (a region surrounded by a chain line in the drawing) of a threshold value (for example, 3 W/cm ² ) or more necessary for curing the ink in the light radiation intensity distribution is shown in FIG. 14A. Although the light emitting device 800A shown in FIG. 12A in which the light emitting units 9 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, in the light emitting device 1000 in which the light emitting units 9 and 29 shown in FIG. 14A are arranged side by side, the cylindrical lens unit 10 and the light emitting element rows are one row less (7 rows), but in FIGS. As shown in the figure, a region (a region surrounded by a chain line in the drawing) having a threshold value (for example, 3 W/cm ² ) or more necessary for curing the ink in the light emission intensity distribution has eight columns of cylindrical lens portions 10 and light emitting element columns. And the light emission intensity distribution of the light emitting device 1200 that is integrally provided is approximately the same.

Therefore, as compared with the light emitting device 1200 that is integrally provided and the light emitting device 800A in which the space between the light emitting units 9 is located substantially in the center in the parallel direction of the cylindrical lens portions 10, as shown in FIG. In the light emitting device 1000 in which a plurality of the units 9 and 29 are arranged in parallel and the spacing region between the light emitting units 9 and 29 is located closer to the one end side or the other end side from the center in the parallel direction of the cylindrical lens unit 10, the entire light emitting element array is In some cases, although the number of rows is reduced from 8 to 7, the effect of curing the ink can be made substantially the same.

(Light irradiation device)
By arranging a plurality of light emitting devices as described above side by side in a predetermined arrangement, they can be used as a light irradiation device. FIG. 15 is a schematic configuration diagram of a light irradiation device including the light emitting device 100 shown in FIG. FIG. 16 is a schematic configuration diagram of a light irradiation device including the light emitting device 800A shown in FIG. 12A. Further, FIG. 17 is a schematic configuration diagram of a light irradiation device including the light emitting device 900 shown in FIG. Although two light emitting devices of the light irradiation device shown in FIGS. 15 to 17 are illustrated, two light emitting devices may be provided, or three or more light emitting devices may be provided. Further, in the light irradiation device, the plurality of light emitting devices are mounted on a substrate or the like (not shown), and move in any direction (left and right in the drawing) of the arrow shown below the light emitting device. Similarly, the irradiation target S also moves on the irradiation target S in either direction of the arrow shown in the figure. Note that the light irradiation device may have a configuration in which either the light emitting device or the irradiation target S moves, or a configuration in which both of them move.

The light irradiation device shown in FIG. 15 is provided with two light emitting devices 100, and these light emitting devices 100 are arranged in parallel so that the parallel directions of a plurality of cylindrical lens portions coincide with each other. Further, the two light emitting devices 100 of the light irradiation device are arranged downward so that the emitted light is emitted downward. Further, the light irradiation device is provided such that the relative movement directions of the plurality of light emitting devices 100 with respect to the irradiation target S are the same as the parallel direction of the plurality of cylindrical lens units.

The light irradiation device shown in FIGS. 16 and 17 is provided with two light emitting devices 800A and 900, and these light emitting devices 800A and 900 are arranged in parallel so that the parallel directions of a plurality of cylindrical lens portions coincide with each other. .. Further, the two light emitting devices 800A and 900 are arranged downward so that the emitted light is irradiated downward, and the relative movement directions of the plurality of light emitting devices 800A and 900 with respect to the irradiation target S are different. , Are provided so as to be in the same direction 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 having the above-described configuration as the light irradiation device, it is possible to gently change the intensity of the light irradiated to the irradiation target. it can. Further, by arranging a plurality of such light emitting devices in parallel, it is possible to repeatedly irradiate light of which the intensity gradually increases, and it is possible to surely cure ink, for example.

Further, 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 object S to be irradiated is placed on the first light emitting device 100A, which is located 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 emitted to the irradiation target S after the first light emitting device 100A, that is, the second light emitting device 100B arranged on the right side in FIG. The emission wavelengths of the plurality of light emitting elements placed may be 345 nm to 385 nm. More specifically, the emission wavelengths of the light emitting elements 1 mounted on the first light emitting device 100A are 310 nm, and the emission wavelengths of the light emitting elements 1 mounted on the second light emitting device 100B are 365 nm. be able to. With such a configuration, after the irradiation target 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 smoothed by the light of the second light emitting device 100B. Can be cured. Therefore, it is possible to obtain a light irradiation device that can cure the ink more reliably by the light irradiation device.

The light irradiation device shown in FIGS. 15 to 17 includes two light emitting devices, but the number can be appropriately changed depending on the desired light distribution, the size of the irradiation target S, and the like. Further, in the light irradiation device, not only the light emitting devices are arranged in parallel in the same direction as the parallel direction of the plurality of cylindrical lens portions, but also the light emitting device may be provided side by side in the same direction as the extending direction of the cylindrical lens portions.

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 Light transmitting Member 4 conductive wire 5 conductive layer 6 light emitting element array 7 valleys 9, 29, 39 light emitting unit 10 cylindrical lens portion 10a columnar portion 10b curved portion 10c flat portion 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 fixture S irradiation object

Claims (17)

Board,
A plurality of light emitting elements mounted on the substrate and forming three or more rows of light emitting elements;
A light transmissive member in which three or more columns of cylindrical lens portions are arranged in parallel so as to be arranged on the light emitting element columns, respectively.
The light emitting element rows are provided at substantially equal intervals,
The plurality of cylindrical lens portions are provided inside the first cylindrical lens portion including at least rows of both ends and the first cylindrical lens portion in the parallel direction, and the height of the plurality of cylindrical lens portions is the highest. A second light emitting device having a high second cylindrical lens portion. The light emitting device according to claim 1, wherein the second cylindrical lens portion is provided at a central portion in the parallel direction of the cylindrical lens portions. The light emitting element array is an odd array of 5 or more,
The light emitting device according to claim 1, wherein the second cylindrical lens portion includes a central row of the cylindrical lens portions in the parallel direction and at least one row 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 portion includes a row forming a valley located at the center of the cylindrical lens portions in the parallel direction, and at least one row on both sides of the row. The light emitting device according to any one of claims 1 to 4, wherein the cylindrical lens portions are provided so that a height of the cylindrical lens portions decreases from the second cylindrical lens portion toward the outside in the parallel direction. The light emitting device according to any one of claims 1 to 5, wherein the cylindrical lens portions are provided so that their heights are symmetrical with respect to the center in the parallel direction. 7. The light emitting device according to claim 1, wherein the plurality of light emitting elements of the light emitting element array are mounted at substantially equal intervals. A light emitting device comprising a plurality of light emitting units arranged in parallel,
The light emitting unit,
Board,
A plurality of light emitting elements mounted on the substrate and forming a plurality of light emitting element rows in the juxtaposed direction of the light emitting units;
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 portion of the light emitting device has three or more rows in total,
The cylindrical lens portion is provided inside the first cylindrical lens portion including at least rows of both ends and the first cylindrical lens portion in the parallel direction, and the first cylindrical lens portion has the highest height among the plurality of cylindrical lens portions. 2. A light emitting device having a cylindrical lens portion. The light emitting unit includes the second cylindrical lens portion on one end side of the cylindrical lens portion in the parallel direction,
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 claim 1, wherein lower ends of the adjacent cylindrical lens portions are connected to each other. The light emitting device according to claim 1, wherein the adjacent cylindrical lens portions are separated from each other. 13. The light emitting device according to claim 1, wherein the cylindrical lens portion has a substantially semi-elliptical cross section. A light irradiating device comprising a plurality of the light emitting devices according to any one of claims 1 to 13 and irradiating an object to be irradiated with light emitted from the plurality of light emitting devices,
The light emitting device is arranged in the same direction as the parallel direction of the plurality of cylindrical lens portions,
A light irradiation device in which relative movement directions of the plurality of light emitting devices with respect to an irradiation target are the same as the parallel directions of the plurality of cylindrical lens units. The light irradiation device according to claim 14, wherein light emitting elements having different emission wavelengths are mounted for each light emitting device. A first light emitting device provided at a position where the emitted light is first irradiated onto the irradiation target; and a second light emitting device provided at a position where the emitted light is irradiated onto the irradiation target after the first light emitting device, And the emission wavelengths of the plurality of light emitting elements mounted on the first light emitting device are 290 nm to 330 nm, and the emission wavelengths of the plurality of light emitting elements mounted on the second light emitting device are 345 nm to The light irradiation device according to claim 15, having a wavelength of 385 nm. Board,
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 portions include a first cylindrical lens portion and a second cylindrical lens portion having different heights,
The second cylindrical lens portion has the highest height in the plurality of cylindrical lens portions, and is a light emitting unit provided at one end of the plurality of cylindrical lens portions in the parallel direction.