JP2018032799A - Light irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation device which irradiates an irradiation object relatively moving in one direction, with light in such a manner that integrated light quantity becomes uniform.SOLUTION: The light irradiation device is provided that irradiates an irradiation object relatively moving in a first direction, with linear light extending in a second direction orthogonal to the first direction and having a predetermined line width in the first direction. The light irradiation device comprises a plurality of light irradiation modules each of which includes a substrate disposed substantially in parallel to the first direction and the second direction and a plurality of light sources arranged on the surface of the substrate and outputting light, the light irradiation modules being disposed in a manner to be coupled in the second direction. Each substrate is comprised of: a substrate center portion in which a plurality of light sources are arranged in the first direction and the second direction with first density; and a substrate end portion in which a plurality of light sources are arranged with second density higher than the first density. The substrate end portion of each substrate engages with the substrate end portion of an adjacent substrate to form a substrate adjacent portion. In the substrate adjacent portion, the density of the plurality of light sources is substantially equal to the first density.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a light irradiation apparatus that irradiates a line-shaped light to an irradiation object that moves relatively in one direction, and in particular, includes a plurality of light irradiation modules in which a plurality of light sources are arranged in a line. The present invention relates to a light irradiation apparatus.

  Conventionally, as an ink for offset sheet-fed printing, an ultraviolet curable ink that is cured by irradiation with ultraviolet light has been used. Further, an ultraviolet curable resin is used as an adhesive around an FPD (Flat Panel Display) such as a liquid crystal panel or an organic EL (Electro Luminescence) panel. For curing such UV-curable inks and UV-curable resins, generally, an ultraviolet light irradiation device that irradiates ultraviolet light is used. However, particularly in offset sheet-fed printing and FPD applications, a wide irradiation region is irradiated. Therefore, an ultraviolet light irradiation apparatus that irradiates linear irradiation light is used.

  As an ultraviolet light irradiation device, a lamp type irradiation device using a high-pressure mercury lamp, a mercury xenon lamp, or the like as a light source has been conventionally known, but in recent years, there has been a demand for reduction in power consumption, longer life, and downsizing of the device size. Therefore, in place of the conventional discharge lamp, an ultraviolet light irradiation apparatus using an LED as a light source has been developed.

  An ultraviolet light irradiation apparatus using such an LED as a light source is described in Patent Document 1, for example. The ultraviolet light irradiation apparatus described in Patent Document 1 includes a plurality of light irradiation modules including a light irradiation device on which a plurality of light emitting elements (LEDs) are mounted. The plurality of light irradiation modules are arranged in a line on the heat radiating member, and linear ultraviolet light is irradiated to a predetermined region of the irradiation object arranged to face the plurality of light irradiation modules. It is like that.

Japanese Patent Laid-Open No. 2015-153771

  When a plurality of light irradiation modules are connected as in the configuration of Patent Document 1 to form a linear (that is, long) light irradiation device, the substrate size of each light irradiation module can be kept small. For this reason, since generation | occurrence | production of the curvature of a board | substrate can be suppressed and the floating of the board | substrate from the heat radiating member can be suppressed, the heat | fever of LED can be efficiently transmitted to the heat radiating member. Moreover, in the structure of patent document 1, since the irradiation width can be easily changed by changing the number of the light irradiation modules to be used, according to the width of the irradiation object (that is, according to the specification). What is necessary is just to determine the number of the light irradiation modules to be used, which is effective in that it can deal with irradiation objects of various sizes.

  However, when a plurality of light irradiation modules are connected as in the configuration of Patent Document 1, the arrangement of LEDs is not continuous in a connection portion (that is, a joint portion) between adjacent light irradiation modules (that is, the interval between the LEDs is small). There is a problem of becoming wide). In particular, when the irradiation object moves relative to the light irradiation device, such as for use in offset sheet printing, a predetermined integrated light quantity is required on the irradiation object, and the adjacent light irradiation module When the LED interval becomes wide at the connecting portion (that is, the joint portion), the integrated light amount of this part becomes lower than the integrated light amount of other portions (that is, the integrated light amount is uniform). Therefore, there is a problem that the ink cannot be uniformly cured (that is, uneven curing occurs).

  This invention is made | formed in view of such a situation, The place made into the objective is the irradiation object which moves relatively in one direction, taking the structure which connects a some light irradiation module. On the other hand, it is to provide a light irradiation apparatus that irradiates light so that the integrated light quantity becomes uniform.

  In order to achieve the above object, a light irradiation apparatus of the present invention extends on an irradiation object relatively moving in a first direction, extends in a second direction orthogonal to the first direction, and is predetermined in the first direction. A light irradiation device for irradiating line-shaped light having a line width, and a substrate substantially parallel to the first direction and the second direction, and a plurality of light sources arranged on the surface of the substrate and emitting light, respectively. A plurality of light irradiation modules arranged to be connected in the second direction, and each substrate includes a central portion of the substrate in which the plurality of light sources are arranged at the first density in the first direction and the second direction. A plurality of light sources arranged at a second density higher than the first density, and the substrate end of each substrate is engaged with a substrate end of an adjacent substrate to form a substrate An adjacent portion is formed, and the density of the plurality of light sources is substantially equal to the first density in the adjacent portion of the substrate. That.

  According to such a configuration, while adopting a configuration in which a plurality of light irradiation modules are connected, the density of the light sources is substantially equal at the central portion of the substrate and the adjacent portion of the substrate, so that the integrated light amount is uniform on the irradiation object. It becomes.

  Further, in the central portion of the substrate, the plurality of light sources are arranged with M (M is an integer of 2 or more) at a first interval along the first direction, and at a second interval along the second direction. N (N is an integer of 4 or more) are arranged, and in the substrate adjacent portion, the plurality of light sources may be configured to be arranged at a third interval narrower than the second interval along the second direction. it can. In this case, it is desirable that the plurality of light sources are arranged at a first interval along the first direction in the substrate adjacent portion.

  Further, in the substrate adjacent portion, it is desirable that the plurality of light sources are arranged at a fourth interval that is narrower than the first interval along the first direction.

  Further, it is desirable that the substrate end portion of each substrate and the substrate end portion of the substrate adjacent to each other have shapes complementary to each other.

  Moreover, it has the junction part which a light source is not arrange | positioned between the board | substrate edge part of each board | substrate, and the board | substrate edge part of an adjacent board | substrate, and the board | substrate edge part of the board | substrate which the board | substrate edge part of each board | substrate adjoins via a junction part Is preferably configured to engage.

  Moreover, it can comprise so that a junction part may incline with respect to a 1st direction. In this case, the shape of each substrate is preferably a parallelogram.

  In addition, it is desirable that the joint is formed in a stepped shape.

  In addition, it is desirable that the joint portion is formed in a dogleg shape.

  As described above, according to the present invention, a light irradiation apparatus that irradiates light to a three-dimensional irradiation object moving in one direction so that the integrated light amount is uniform is realized.

It is an external view explaining the schematic structure of the light irradiation apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining the structure of the LED module with which the light irradiation apparatus which concerns on the 1st Embodiment of this invention is equipped. It is a graph which shows the integrated light quantity when using the light irradiation apparatus which concerns on the 1st Embodiment of this invention, and irradiated an ultraviolet light on the irradiation target object. It is a figure explaining the structure of the comparative example of the light irradiation apparatus which concerns on the 1st Embodiment of this invention. It is a graph which shows the integrated light quantity when irradiating an ultraviolet-ray on an irradiation target object using the structure of the comparative example of FIG. It is a figure explaining the structure of the comparative example of the light irradiation apparatus which concerns on the 1st Embodiment of this invention. It is a graph which shows the integrated light quantity when irradiating an ultraviolet-ray on an irradiation target object using the structure of the comparative example of FIG. It is a figure explaining the structure of the light irradiation apparatus which concerns on the 2nd Embodiment of this invention. It is a graph which shows the integrated light quantity when irradiating an ultraviolet-ray on an irradiation target object using the light irradiation apparatus which concerns on the 2nd Embodiment of this invention. It is a figure explaining the structure of the light irradiation apparatus which concerns on the 3rd Embodiment of this invention. It is a graph which shows the integrated light quantity when irradiating an ultraviolet-ray on an irradiation target object using the light irradiation apparatus which concerns on the 3rd Embodiment of this invention. It is a figure explaining the structure of the light irradiation apparatus which concerns on the 4th Embodiment of this invention. It is a graph which shows the integrated light quantity when ultraviolet light is irradiated on the irradiation target object using the light irradiation apparatus which concerns on the 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in a figure, and the description is not repeated.

(First embodiment)
FIG. 1 is an external view illustrating a schematic configuration of a light irradiation apparatus 10 according to an embodiment of the present invention. The light irradiation device 10 of the present embodiment is a device mounted on a light source device that cures ultraviolet curable ink used as ink for offset sheet-fed printing, and is disposed to face an irradiation object, and is relatively A linear ultraviolet light is emitted to the moving irradiation object. In the present specification, the longitudinal (line length) direction of the line-shaped ultraviolet light emitted from the light irradiation device 10 is the X-axis direction (second direction), and the short (line width) direction (that is, the irradiation target object). In the following description, the movement direction is defined as the Y-axis direction (first direction), and the direction orthogonal to the X-axis and the Y-axis (that is, the vertical direction) is defined as the Z-axis direction. 1A is a front view (viewed from the Z-axis direction) of the light irradiation apparatus 10 of the present embodiment, and FIG. 1B is a bottom view (viewed from the Y-axis direction). FIG. 1C is a right side view (viewed from the X-axis direction).

  As shown in FIG. 1, the light irradiation apparatus 10 of this embodiment has the baseplate 100 and the two LED modules 210 and 220 (light irradiation module) in the case not shown.

  The base plate 100 is a rectangular plate-shaped member made of metal (for example, aluminum or copper) that fixes the LED modules 210 and 220. As shown in FIG. 1, two LED modules 210 and 220 are placed on the surface of the base plate 100 of the present embodiment, and are fixed by screws (not shown). Note that the base plate 100 of the present embodiment also has a function of a heat sink that dissipates heat from the LED modules 210 and 220 into the air.

  The LED modules 210 and 220 are members that emit ultraviolet light, and include a substantially parallelogram-shaped flat substrate 202 in a plan view and a plurality of LED elements 205 arranged on the substrate 202. As shown in FIG. 1, the LED modules 210 and 220 of this embodiment are arranged with the substrates 202 connected in the X-axis direction. However, as described in the prior art, the connecting portion (that is, the joint portion). However, if the interval between the LED elements 205 is partially widened, there is a problem that the integrated light quantity does not become uniform. Therefore, in order to solve such a problem, in the present embodiment, the shape of each substrate 202 is a substantially parallelogram, and the oblique sides of each substrate 202 and the oblique sides of the adjacent substrate 202 are engaged with each other. The arrangement density of the LED elements 205 is increased at the engaging portion (that is, the end portion of each substrate 202 in the X-axis direction (“substrate end portion Q” shown in FIG. 2)).

  The substrate 202 is a wiring substrate formed of a material having high thermal conductivity (for example, aluminum nitride). The surface of the substrate 202 is 20 pieces (in the X-axis direction) × 10 rows (in the Y-axis direction). The LED elements 205 are mounted on a COB (Chip On Board). An anode pattern (not shown) and a cathode pattern (not shown) for supplying power to each LED element 205 are formed on the substrate 202, and each LED element 205 is electrically connected to the anode pattern and the cathode pattern, respectively. Connected. The substrate 202 is electrically connected to a driver circuit (not shown) via a wiring cable (not shown), and a driving current is supplied to each LED element 205 from the driver circuit via an anode pattern and a cathode pattern. It has become so. When a driving current is supplied to each LED element 205, each LED element 205 emits ultraviolet light (for example, wavelengths 365 nm, 385 nm, and 405 nm) with a light amount corresponding to the driving current. In addition, the drive current supplied to each LED element 205 is adjusted so that each LED element 205 of this embodiment radiates | emits the ultraviolet light of a substantially equal light quantity.

  FIG. 2 is a diagram illustrating the arrangement of the LED elements 205 of the LED modules 210 and 220 according to the present embodiment. In FIG. 2, (1) to (10) indicate the column numbers of the LED elements 205.

  As shown in FIG. 2, the LED modules 210 and 220 of the present embodiment are arranged along the X-axis direction with the base of the parallelogram substrate 202 being parallel to the X-axis direction. One oblique side of the substrate 202 (right oblique side in FIG. 2) is disposed and fixed so as to contact (engage) the other oblique side (left oblique side in FIG. 2) of the substrate 202 of the LED module 220. And LED element 205 of each row | line | column (1)-(10) of LED module 210,220 is arrange | positioned so that the X-axis direction may be continued on both sides of the joint part J (joining part). In addition, in the joint part J, since the LED element 205 cannot be physically disposed, the interval between the LED elements 205 is partially widened. In the present embodiment, the interval between the columns (1) to (10) (that is, the interval in the Y-axis direction) is set to approximately 3 mm.

  Further, because of the shape tolerance of the substrate 202 and restrictions on the pattern wiring, the LED elements 205 cannot be arranged within a predetermined distance (for example, 1 mm) from the end of the substrate 202. The arrangement of the LED elements 205 is shifted in the X-axis direction. More specifically, as shown in FIG. 2, the LED elements 205 in the columns (1) and (2) are arranged at the same position in the X-axis direction, and the LED elements in the columns (3) and (4). 205 is arranged at the same position in the X-axis direction and is shifted in the X-axis direction with respect to the LED elements 205 in the columns (1) and (2). The LED elements 205 in the rows (5) and (6) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (3) and (4). The LED elements 205 in the rows (7) and (8) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (5) and (6). The LED elements 205 in the rows (9) and (10) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (7) and (8). The LED elements 205 of the present embodiment are also aligned in the Y-axis direction, and the LED elements 205 (in FIG. 2, in the region where the 10 LED elements 205 are arranged in the Y-axis direction (substrate central portion P)). LED elements 205 indicated by white squares (outlined squares) are arranged at an interval of about 3 mm in the X-axis direction, and are regions in which fewer than ten LED elements 205 are arranged in the Y-axis direction (substrate end portion Q). ) LED elements 205 (LED elements 205 indicated by black squares (solid squares in FIG. 2)) are arranged at an interval of approximately 2.5 mm in the X-axis direction. That is, the arrangement density of the LED elements 205 in the X-axis direction at the substrate end Q is configured to be higher than the arrangement density of the LED elements 205 in the X-axis direction at the substrate center P. The arrangement density of the LED elements 205 in the region where the substrate end portions Q of the two LED modules 210 and 220 are adjacent to each other with the joint portion J interposed therebetween (that is, the substrate adjacent portion R in FIG. 2) is 60 ( The number of LED elements 205 in the substrate adjacent portion R) / 15 mm (width of the substrate adjacent portion R), and the arrangement density of the LED elements 205 in the substrate central portion P of each LED module 210, 220 (per 15 mm in the substrate central portion P) The number of LED elements 205 is 60). With such a configuration, as shown in FIG. 2, even if the LED elements 205 in the substrate adjacent portion R are not evenly spaced in the X-axis direction and the Y-axis direction, they move relatively. A substantially uniform integrated light quantity can be obtained on the irradiation object.

  FIG. 3 is a graph showing an integrated light amount when the light irradiation apparatus 10 of the present embodiment is used to irradiate ultraviolet light onto an irradiation object that moves at a constant speed in the Y-axis direction. “WD5” and “WD10” in FIG. 3 indicate the work distance (that is, the travel position) of the irradiation object, and “WD5” is an integrated value on the irradiation object that travels 5 mm away from the light irradiation device 10. “WD10” indicates the integrated light amount on the irradiation object traveling at a position 10 mm away from the light irradiation device 10. The vertical axis in FIG. 3 indicates the integrated light quantity (W / cm), and the horizontal axis in FIG. 3 indicates the longitudinal direction of the light irradiation apparatus 10 (that is, the X axis) with the center in the longitudinal direction of the light irradiation apparatus 10 being 0 mm. The position corresponding to (direction) is shown. The effective irradiation area in the X-axis direction of the light irradiation device 10 is ± 40 mm (that is, 80 mm).

  As shown in FIG. 3, according to the light irradiation apparatus 10 of the present embodiment, an integrated light amount of 1.9% is obtained on the irradiation object at the position “WD5”, and the position at the position “WD10” is obtained. An integrated light quantity of 4.1% is obtained on the irradiation object. In the present specification, the uniformity refers to (MAX−MIN) / (MAX + MIN) × 100 when the maximum value of the integrated light quantity in the effective irradiation area is “MAX” and the minimum value is “MIN”. In this embodiment, when the degree of uniformity (that is, unevenness of the integrated light amount distribution in the effective irradiation area) is less than 6%, it is evaluated that the light amount is substantially uniform. .

  Here, in order to explain the effect of this embodiment, some comparative examples will be shown. FIG. 4 is a diagram illustrating the configuration of LED modules 210X and 220X included in the light irradiation apparatus 10X of the first comparative example. FIG. 5 is a graph showing the integrated light quantity when the light irradiation apparatus 10X is used to irradiate ultraviolet light onto an irradiation target that moves at a constant speed in the Y-axis direction.

  As shown in FIG. 4, in the LED modules 210X and 220X, 200 LED elements 205 are square on a rectangular substrate 202X in the form of 20 (X-axis direction) × 10 columns (Y-axis direction). COB (Chip On Board) is mounted in a grid (3 mm × 3 mm). That is, the LED modules 210X and 220X are different from the LED modules 210 and 220 of the present embodiment in that the shape of the substrate 202X is different and the substrate end Q where the arrangement density of the LED elements 205 is not provided. And if such a structure is taken, since the space | interval of each LED element 205 will become wide in a connection part (namely, joint part J), as shown in FIG. 5, the longitudinal direction approximate center of the light irradiation apparatus 10X It can be seen that the integrated light quantity drops and does not become uniform. In FIG. 5, the uniformity on the irradiation target at the position “WD5” was 10.3%, and the uniformity on the irradiation target at the position “WD10” was 7.1%. .

  FIG. 6 is a diagram illustrating the configuration of LED modules 210Y and 220Y included in the light irradiation apparatus 10Y of the second comparative example. Further, FIG. 7 is a graph showing the integrated light amount when the light irradiation apparatus 10Y is used to irradiate ultraviolet light onto an irradiation object that moves at a constant speed in the Y-axis direction.

  As shown in FIG. 6, in the LED modules 210Y and 220Y, 20 (X-axis direction) × 10 rows (Y-axis direction) on a substantially parallelogram-shaped flat plate substrate 202Y in plan view, 200 LED elements 205 are mounted on a COB (Chip On Board) at equal intervals (X-axis direction: 3 mm, Y-axis direction: 3 mm). That is, the LED modules 210Y and 220Y are different from the LED modules 210 and 220 of the present embodiment in that they do not include the substrate end Q where the arrangement density of the LED elements 205 is high. When such a configuration is adopted, the arrangement density of the LED elements 205 is reduced around the connecting portion (that is, the joint portion J). Therefore, as shown in FIG. It can be seen that the integrated light quantity falls in the center and does not become uniform. In FIG. 7, the uniformity on the irradiation object at the position “WD5” was 9.0%, and the uniformity on the irradiation object at the position “WD10” was 6.2%. .

  As described above, in the configuration of the present embodiment, the shape of each substrate 202 of the LED modules 210 and 220 is a substantially parallelogram, and the oblique sides of each substrate 202 and the oblique sides of the adjacent substrate 202 are engaged. And the arrangement density in the X-axis direction of the LED elements 205 at the substrate end Q of each substrate 202 is configured to be higher than the arrangement density in the X-axis direction of the LED elements 205 at the substrate center P. Yes. Then, when the two LED modules 210 and 220 are connected in the X-axis direction, the substrate end portion Q of each substrate 202 is adjacent to the joint portion J (that is, the substrate adjacent portion R in FIG. 2). The arrangement density of the LED elements 205 is substantially equal to the arrangement density of the LED elements 205 in the substrate central portion P of each substrate 202. For this reason, when the light irradiation apparatus 10 of this embodiment is used to irradiate ultraviolet light onto an irradiation object that moves at a constant speed in the Y-axis direction, a substantially uniform integrated light quantity can be obtained on the irradiation object. .

  The above is the description of the present embodiment, but the present invention is not limited to the above configuration, and various modifications can be made within the scope of the technical idea of the present invention.

  For example, although the board | substrate 202 of this embodiment was demonstrated as what exhibits a substantially parallelogram shape by planar view, it is not limited to such a structure, Two board | substrates 202 are followed along an X-axis direction. Any shape may be used as long as the two substrates 202 are engaged with each other and the substrate ends Q of the substrates 202 are continuous in the X-axis direction and the Y-axis direction with the joint portion J interposed therebetween.

  In the present embodiment, the two LED modules 210 and 220 are described as being connected in the X-axis direction. However, the present invention is not limited to this configuration, and more LED modules are connected in the X-axis direction. May be.

(Second Embodiment)
FIG. 8 is a diagram showing a configuration of a light irradiation apparatus 10A according to the second embodiment of the present invention. For convenience of explanation, only the LED modules 210A and 220A are shown in FIG. 8, and other configurations are omitted.

  As shown in FIG. 8, the light irradiation apparatus 10A of the present embodiment is configured so that each substrate 202A of the LED modules 210A and 220A complements the convex portion 202Aa that protrudes in a U-shape and the convex portion 202Aa. Unlike the light irradiation apparatus 10 of the first embodiment, the convex portion 202Aa of the substrate 202A of the LED module 210A is engaged with the concave portion 202Ab of the substrate 202A of the LED module 220A, in that the concave portion 202Ab that is recessed in the shape of a letter is provided. Arranged and fixed. Then, the LED elements 205 in the respective rows (1) to (10) of the LED modules 210A and 220A sandwich the joint portion J (that is, the interval between the LED elements 205 is partially widened) in the X-axis direction. It is arranged to be continuous. In the present embodiment, the LED elements 205 in the rows (1) and (10) are arranged at the same position in the X-axis direction, and the LED elements 205 in the rows (2) and (9) are in the X-axis direction. Are arranged at the same position and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (1) and (10). The LED elements 205 in the columns (3) and (8) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the columns (2) and (9). The LED elements 205 in the columns (4) and (7) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the columns (3) and (8). The LED elements 205 in the columns (5) and (6) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the columns (4) and (7). The LED elements 205 of the present embodiment are also aligned in the Y-axis direction, and the LED elements 205 (in FIG. 8, in the region where the ten LED elements 205 are arranged in the Y-axis direction (substrate central portion P)). LED elements 205 indicated by white squares (outlined squares) are arranged at an interval of about 3 mm in the X-axis direction, and are regions in which fewer than ten LED elements 205 are arranged in the Y-axis direction (substrate end portion Q). ) LED elements 205 (LED elements 205 indicated by black squares (black squares in FIG. 8)) are arranged at an interval of approximately 2.5 mm in the X-axis direction. That is, the arrangement density of the LED elements 205 in the X-axis direction at the substrate end Q is configured to be higher than the arrangement density of the LED elements 205 in the X-axis direction at the substrate center P. And in the area | region (namely, board | substrate adjacent part R of FIG. 8) where two LED module 210A, 220A adjoins across the joint part J, the arrangement density of the LED element 205 is 60 pieces (board | substrate adjacent part R of the board | substrate adjacent part R). The number of LED elements 205) / 15 mm (the width of the board adjacent portion R), and the arrangement density of the LED elements 205 in the substrate center portion P of each LED module 210A, 220A (the LED elements 205 per 15 mm in the substrate center portion P) (Number: 60). That is, in this embodiment as well as the first embodiment, the LED modules 210A and 220A are disposed so that the substrates 202A are engaged with each other, and the X of the LED element 205 at the substrate end Q of each substrate 202A is arranged. The arrangement density in the axial direction is configured to be higher than the arrangement density in the X-axis direction of the LED elements 205 in the substrate central portion P. When the two LED modules 210A and 220A are connected in the X-axis direction, the substrate end Q of each substrate 202A is adjacent to the seam J (that is, the substrate adjacent portion R in FIG. 8). The arrangement density of the LED elements 205 is substantially equal to the arrangement density of the LED elements 205 in the substrate central portion P of each substrate 202A. For this reason, when the irradiation target object moving at a constant speed in the Y-axis direction is irradiated with ultraviolet light using the light irradiation apparatus 10A of the present embodiment, a substantially uniform integrated light amount can be obtained on the irradiation target object. .

  FIG. 9 is a graph showing the integrated light quantity when ultraviolet light is irradiated onto an irradiation object that moves at a constant speed in the Y-axis direction using the light irradiation apparatus 10A of the present embodiment. As shown in FIG. 9, according to the light irradiation apparatus 10A of the present embodiment, an integrated light amount of 3.8% is obtained on the irradiation object at the position “WD5”, and the position at the position “WD10” is obtained. An integrated light amount of 5.0% uniformity is obtained on the irradiation object.

(Third embodiment)
FIG. 10 is a diagram showing a configuration of a light irradiation apparatus 10B according to the third embodiment of the present invention. For convenience of explanation, only the LED modules 210B and 220B are shown in FIG. 10, and other configurations are omitted.

  As shown in FIG. 10, the light irradiation device 10B of the present embodiment has a stepped shape so that each substrate 202B of the LED modules 210B and 220B protrudes in a stepped manner and the protruding portion 202Ba complements the protruding portion 202Ba. Unlike the light irradiation apparatus 10 of the first embodiment in that it has a recessed portion 202Bb, the convex portion 202Ba of the substrate 202B of the LED module 210B is arranged to engage with the concave portion 202Bb of the substrate 202B of the LED module 220B. It is fixed. Then, the LED elements 205 in the rows (1) to (10) of the LED modules 210B and 220B sandwich the joint portion J (that is, the interval between the LED elements 205 is partially widened) in the X-axis direction. It is arranged to be continuous. In this embodiment, the LED elements 205 in the rows (1) to (5) are arranged at the same position in the X-axis direction, and the LED elements 205 in the rows (6) to (10) are in the X-axis direction. Are arranged at the same position and are shifted in the X-axis direction with respect to the LED elements 205 in the columns (1) to (5). The LED elements 205 of the present embodiment are also aligned in the Y-axis direction, and the LED elements 205 (in FIG. 10, the central portion P of the substrate) in which the ten LED elements 205 are arranged in the Y-axis direction. LED elements 205 indicated by white squares (outlined squares) are arranged at an interval of about 3 mm in the X-axis direction, and are regions in which fewer than ten LED elements 205 are arranged in the Y-axis direction (substrate end portion Q). ) LED elements 205 (LED elements 205 indicated by black squares (black squares in FIG. 10)) are arranged at an interval of approximately 2.5 mm in the X-axis direction. Further, the LED elements 205 in the substrate adjacent portion R of this embodiment are arranged so that the interval in the Y-axis direction is 2.5 mm. That is, the arrangement density of the LED elements 205 in the X-axis direction and the Y-axis direction at the substrate end Q is configured to be higher than the arrangement density of the LED elements 205 in the X-axis direction and the Y-axis direction in the substrate center P. ing. The arrangement density of the LED elements 205 in a region where the substrate end portions Q of the two LED modules 210B and 220B are adjacent to each other with the joint portion J interposed therebetween (that is, the substrate adjacent portion R in FIG. 10) is 60 ( The number of LED elements 205 in the substrate adjacent portion R) / 15 mm (width of the substrate adjacent portion R), and the arrangement density of the LED elements 205 in the substrate central portion P of each LED module 210, 220 (per 15 mm in the substrate central portion P) The number of LED elements 205 is 60). That is, in the present embodiment as well as the first embodiment, the LED modules 210B and 220B are disposed so that the substrates 202B are engaged with each other, and the LED elements 205 are disposed at the substrate ends Q of the substrates 202B. The density is configured to be higher than the arrangement density of the LED elements 205 in the central portion P of the substrate. Then, when the two LED modules 210B and 220B are connected in the X-axis direction, the substrate end portion Q of each substrate 202B is adjacent to the joint portion J (that is, the substrate adjacent portion R in FIG. 10). The arrangement density of the LED elements 205 in () is substantially equal to the arrangement density of the LED elements 205 in the substrate central portion P of each substrate 202B. For this reason, when the irradiation target object moving at a constant speed in the Y-axis direction is irradiated with ultraviolet light using the light irradiation apparatus 10B of the present embodiment, a substantially uniform integrated light amount can be obtained on the irradiation target object. .

  FIG. 11 is a graph showing the integrated light amount when ultraviolet light is irradiated onto an irradiation object that moves at a constant speed in the Y-axis direction using the light irradiation device 10B of the present embodiment. As shown in FIG. 11, according to the light irradiation apparatus 10B of the present embodiment, an integrated light amount of 5.2% is obtained on the irradiation object at the position “WD5”, and the position at the position “WD10” is obtained. An integrated light amount of 4.0% uniformity is obtained on the irradiation object.

(Fourth embodiment)
FIG. 12 is a diagram showing a configuration of a light irradiation apparatus 10C according to the fourth embodiment of the present invention. For convenience of explanation, only the LED modules 210C and 220C are shown in FIG. 12, and other configurations are omitted.

  As shown in FIG. 12, in the light irradiation apparatus 10C of this embodiment, the angle of the oblique side of each substrate 202C of the LED modules 210C and 220C is large, and 20 pieces (in the X-axis direction) × 20 rows on each substrate 202C ( In the aspect of (Y-axis direction), 400 LED elements 205 differ from the light irradiation apparatus 10 of 1st Embodiment by the point by which COB (Chip On Board) mounting is carried out. Then, the LED elements 205 in each row (1) to (20) of the LED modules 210C and 220C sandwich the joint portion J (that is, the interval between the LED elements 205 is partially widened) in the X-axis direction. It is arranged to be continuous. In the present embodiment, the LED elements 205 in the columns (1) to (4) are arranged at the same position in the X-axis direction, and the LED elements 205 in the columns (5) to (8) are in the X-axis direction. Are arranged at the same position and are shifted in the X-axis direction with respect to the LED elements 205 in the columns (1) to (4). The LED elements 205 in the rows (9) to (12) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (5) to (8). The LED elements 205 in the rows (13) to (16) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (9) to (12). The LED elements 205 in the rows (17) to (20) are arranged at the same position in the X-axis direction, and are shifted in the X-axis direction with respect to the LED elements 205 in the rows (13) to (16). The LED elements 205 of the present embodiment are also aligned in the Y-axis direction, and the LED elements 205 (in FIG. 12, the central portion P of the substrate) where 20 LED elements 205 are arranged in the Y-axis direction. LED elements 205 indicated by white squares (outlined squares) are arranged at an interval of about 3 mm in the X-axis direction, and a region where fewer than 20 LED elements 205 are arranged in the Y-axis direction (substrate end Q) ) LED elements 205 (LED elements 205 indicated by black squares (black squares in FIG. 12)) are arranged at an interval of approximately 2.14 mm in the X-axis direction. That is, the arrangement density of the LED elements 205 in the X-axis direction at the substrate end Q is configured to be higher than the arrangement density of the LED elements 205 in the X-axis direction at the substrate center P. And in the area | region (namely, board | substrate adjacent part R of FIG. 12) where the two LED modules 210C and 220C are adjacent on both sides of the joint part J, the arrangement density of 120 LED elements (of board | substrate adjacent part R) The number of LED elements 205) / about 15 mm (width of the board adjacent portion R), and the arrangement density of the LED elements 205 (the LED elements 205 per 15 mm in the board central portion P) in the board central portion P of each LED module 210C, 220C. The number is set to be approximately equal to 120). That is, in the present embodiment as well, as in the first embodiment, the LED modules 210C and 220C are disposed so that the substrates 202C are engaged with each other, and the X of the LED element 205 at the substrate end Q of each substrate 202C. The arrangement density in the axial direction is configured to be higher than the arrangement density in the X-axis direction of the LED elements 205 in the central portion P of the substrate. Then, when the two LED modules 210C and 220C are connected in the X-axis direction, the substrate end portion Q of each substrate 202C is adjacent to the seam portion J (that is, the substrate adjacent portion R in FIG. 12). The arrangement density of the LED elements 205 is substantially equal to the arrangement density of the LED elements 205 in the substrate central portion P of each substrate 202C. For this reason, when the irradiation target object moving at a constant speed in the Y-axis direction is irradiated with ultraviolet light using the light irradiation apparatus 10C of the present embodiment, a substantially uniform integrated light amount can be obtained on the irradiation target object. .

  FIG. 13 is a graph showing an integrated light amount when ultraviolet light is irradiated onto an irradiation object moving at a constant speed in the Y-axis direction using the light irradiation apparatus 10C of the present embodiment. As shown in FIG. 13, according to the light irradiation apparatus 10 </ b> C of the present embodiment, an integrated light amount of 4.4% is obtained on the irradiation object at the position “WD5”, and the position at the position “WD10” is obtained. An integrated light amount of 5.3% uniformity is obtained on the irradiation object.

  In the present embodiment, 20 LED elements 205 (X-axis direction) × 20 rows (Y-axis direction) are arranged in the form, and in the first embodiment, 20 LED elements 205 (X-axis direction). However, the present invention is not limited to this configuration, and as long as the substrate adjacent portion R is formed, N pieces are arranged in the X-axis direction. (N is an integer of 4 or more), and M (M is an integer of 2 or more) may be arranged in the Y-axis direction.

  In the first to fourth embodiments, the LED elements 205 in the central portion P of the substrate are arranged in a square lattice shape. However, the present invention is not limited to such a configuration, and is substantially one. What is necessary is just to arrange | position so that it may become such arrangement | positioning density.

  Further, in the first to fourth embodiments, the LED elements 205 at the substrate end Q are arranged at predetermined intervals in the X-axis direction and the Y-axis direction. In the region where the substrate end portions Q of the respective substrates are adjacent to each other with the joint portion J interposed therebetween when the substrates are connected in the X-axis direction (that is, the substrate adjacent portion R), What is necessary is just to arrange | position so that it may become a substantially uniform arrangement density.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10, 10A, 10B, 10C, 10X, 10Y Light irradiation device 100 Base plate 202 Substrate 202Aa, 202Ba Convex part 202Ab, 202Bb Concave part 205 LED element 210, 220, 210A, 220A, 210B, 220B, 210C, 220C LED module

Claims (10)

Light irradiation that irradiates a line-shaped light that extends in a second direction orthogonal to the first direction and has a predetermined line width in the first direction on an irradiation object that moves relatively in the first direction. A device,
A substrate substantially parallel to the first direction and the second direction, and a plurality of light sources arranged on the surface of the substrate and emitting the light, and are arranged so as to be connected in the second direction. A plurality of light irradiation modules,
Each of the substrates includes a substrate central portion in which the plurality of light sources are arranged at a first density in the first direction and the second direction, and a second density in which the plurality of light sources are higher than the first density. And an end portion of the substrate arranged in
The substrate end of each substrate engages with the substrate end of an adjacent substrate to form a substrate adjacent portion;
The light irradiation apparatus according to claim 1, wherein a density of the plurality of light sources is substantially equal to the first density in the substrate adjacent portion. In the central portion of the substrate, the plurality of light sources are arranged with M (M is an integer of 2 or more) at a first interval along the first direction, and at a second interval along the second direction. N (N is an integer of 4 or more) are arranged,
2. The light irradiation apparatus according to claim 1, wherein the plurality of light sources are arranged at a third interval narrower than the second interval along the second direction in the substrate adjacent portion.   The light irradiation apparatus according to claim 2, wherein the plurality of light sources are arranged at the first interval along the first direction in the substrate adjacent portion.   3. The light irradiation apparatus according to claim 2, wherein the plurality of light sources are arranged at a fourth interval narrower than the first interval along the first direction in the substrate adjacent portion.   5. The light irradiation apparatus according to claim 1, wherein the substrate end portions of the substrates adjacent to the substrate end portions of the substrates have shapes complementary to each other.   Between the substrate end portion of each substrate and the substrate end portion of the adjacent substrate, there is a joint portion where the light source is not disposed, and the substrate end portion of each substrate is adjacent via the joint portion. The light irradiation device according to claim 1, wherein the light irradiation device is engaged with the substrate end portion of the substrate.   The light irradiation apparatus according to claim 6, wherein the joint portion is inclined with respect to the first direction.   The light irradiation apparatus according to claim 7, wherein the shape of each of the substrates is a parallelogram.   The light irradiation apparatus according to claim 6, wherein the joint portion is formed in a stepped shape.   The light irradiation apparatus according to claim 6, wherein the joint portion is formed in a U shape.

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