Light irradiation module, light irradiation device

Abstract

To provide a light irradiation module capable of irradiating a light of a uniform strength.SOLUTION: A light irradiation module comprises: a substrate that is regulated by a first direction and a second direction orthogonal to the first direction; a plurality of wiring patterns formed onto the substrate; and a plurality of LED elements that is arranged onto the plurality of wiring patterns. In the light irradiation module, the plurality of wiring patterns contains: a first wiring pattern that includes a first straight line part extending in the first direction and a plurality of first projection parts projecting in a direction contradicted to the second direction from the first straight line; and a second wiring pattern that contains a second straight line part extending in the first direction and a plurality of second projection parts projecting in the second direction from the second straight part. The first wiring pattern and the second wiring pattern are alternately arranged along a direction contradicted to the second direction, and each of the plurality of first projection parts of the first wiring pattern and the plurality of second projection parts of the second wiring pattern adjacent in the direction contradicted to the second direction are alternately arranged along the first direction. The plurality of LED elements is arranged onto each first projection part and each second projection part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a light irradiation module having a plurality of LED (Light Emitting Diode) elements on a substrate, and a light irradiation device having the same. [Background technology]

[0002] Conventionally, ultraviolet-curable inks that are cured by irradiation with ultraviolet light have been used as inks for offset sheet-fed printing. Furthermore, ultraviolet-curable resins have been used as sealants for FPDs (Flat Panel Displays), such as liquid crystal panels and organic EL (Electro Luminescence) panels. To cure such ultraviolet-curable inks and resins, a light irradiation device that irradiates ultraviolet light is generally used (for example, Patent Document 1).

[0003] Conventionally, lamp-type irradiation devices using high-pressure mercury lamps, mercury-xenon lamps, or the like as light sources have been known as ultraviolet light irradiation devices. However, in recent years, due to demands for reduced power consumption, longer life, and more compact device size, ultraviolet light irradiation devices using ultraviolet LEDs as light sources instead of conventional discharge lamps have come into practical use (e.g., Patent Document 1).

[0004] FIG. 4 shows the configuration of a light source unit (ultraviolet light irradiation device) described in Patent Document 1, where FIG. 4(a) is a plan view of the light source unit and FIG. 4(b) is a diagram showing the wiring pattern (gray portion) on a substrate 1 of the light source unit. As shown in FIG. 4, the light source unit described in Patent Document 1 includes a substrate 1, a plurality of strip-shaped wirings 2 arranged on the substrate 1, and a plurality of LED elements 3 arranged in a row on each strip-shaped wiring 2. The LED elements 3 on each strip-shaped wiring 2 are arranged so as to be offset from the LED elements 3 on adjacent strip-shaped wiring 2 in the wiring direction, and are arranged in a staggered pattern across the entire substrate 1. Wires 5 connected to the upper electrodes 4 of each LED element 3 are connected to the regions between the LED elements 3 on adjacent strip-shaped wiring 2. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5803835 Summary of the Invention [Problem to be solved by the invention]

[0006] In this way, by arranging the LED elements 3 in a staggered manner, when the light source unit moves relative to the object to be irradiated (print media), ultraviolet light can be irradiated over a range equal to the movement width of the light source unit.

[0007] However, the configuration of Figure 4 of Patent Document 1 has the problem that the intensity of the ultraviolet light is not uniform because the LED elements 3 are thinned out (spaced apart) in the wiring direction (i.e., the left-right direction in Figure 4) and in a direction perpendicular to the wiring direction (i.e., the up-down direction in Figure 4). This problem is particularly pronounced when the object to be irradiated does not move at a constant speed relative to the light source unit (i.e., when ultraviolet light is irradiated onto a fixed object to be irradiated, or when ultraviolet light is irradiated onto an object to be irradiated that moves at a random speed), resulting in unevenness in the intensity of the ultraviolet light and in uneven curing of the ultraviolet-curable ink or ultraviolet-curable resin.

[0008] Furthermore, this problem can be resolved to some extent by increasing the number of LED elements 3 on each strip-shaped wiring 2 and narrowing the spacing between them, but in the configuration of Figure 4, it is necessary to provide space (bonding area) between the LED elements 3 on each strip-shaped wiring 2 to connect the wires 5, so there are physical constraints on increasing the number of LED elements 3 per row. Furthermore, there has been a problem in that the current supplied to the LED elements increases or decreases as the number of LED elements provided in each strip-shaped wiring 2 increases or decreases.

[0009] The present invention has been made in view of the above circumstances, and its object is to provide a light irradiation module (light source unit) that can irradiate light of uniform intensity while reducing the number of LED elements connected in parallel, and also to provide a light irradiation device equipped with such a light irradiation module. [Means for solving the problem]

[0010] In order to achieve the above object, the light irradiation module of the present invention includes a substrate defined by a first direction and a second direction orthogonal to the first direction, a plurality of wiring patterns formed on the substrate, and a plurality of LED elements arranged on the plurality of wiring patterns and emitting light in a third direction orthogonal to the first and second directions, wherein the plurality of wiring patterns include at least one first wiring pattern having a first linear portion extending in the first direction and a plurality of first protrusions protruding from the first linear portion in a direction opposite to the second direction at predetermined intervals in the first direction, a second linear portion extending in the first direction, and a 1 and at least one or more second wiring patterns having a plurality of second protrusions protruding from the second straight portion in the second direction at predetermined intervals in the first direction, the first wiring pattern and the second wiring pattern being alternately arranged along a direction opposite to the second direction, the plurality of first protrusions of each first wiring pattern and the plurality of second protrusions of the second wiring pattern adjacent to it in the direction opposite to the second direction being arranged alternately along the first direction, the plurality of LED elements being arranged on the first protrusions and the second protrusions, the first electrode of each LED element being electrically connected to the first protrusion or the second protrusion directly below it, and the second electrode of each LED element being electrically connected via a wire to the second straight portion or the first straight portion adjacent to it in the direction opposite to the second direction.

[0011] With this configuration, the LED elements on the substrate are densely arranged in the first direction, so the intensity of the ultraviolet light emitted from the LED elements is approximately uniform in the first direction. Also, because the multiple LED elements lined up in the first direction are composed of multiple LED elements connected in parallel on the first wiring pattern and multiple LED elements connected in parallel on the second wiring pattern, the number of LED elements connected in parallel is approximately half the number of multiple LED elements lined up in the first direction (that is, the number of LED elements connected in parallel does not increase more than necessary).

[0012] Furthermore, it is desirable that the multiple LED elements arranged on the multiple first protrusions of each first wiring pattern and the multiple LED elements arranged on the multiple second protrusions of the adjacent second wiring pattern in the direction opposite to the second direction are aligned in approximately a straight line along the first direction.

[0013] Moreover, it is desirable that the plurality of first protrusions and the plurality of second protrusions have a rectangular shape.

[0014] Furthermore, it is desirable that the wiring pattern closest to the second direction form an anode pattern that supplies current to the multiple LED elements, and the wiring pattern closest to the second direction form a cathode pattern through which return current from the multiple LED elements flows. In this case, it is desirable that the substrate have a pair of through holes that vertically penetrate the substrate from the anode pattern and the cathode pattern, respectively. It is also desirable that the substrate have a pair of fixing members that are inserted into the pair of through holes, and power is supplied to the anode pattern and the cathode pattern via the pair of fixing members.

[0015] Furthermore, it is desirable that the plurality of LED elements arranged on the first protrusion emit light of a first wavelength, and the plurality of LED elements arranged on the second protrusion emit light of a second wavelength different from the first wavelength.

[0016] From another viewpoint, the light irradiation device of the present invention is characterized by comprising any one of the light irradiation modules described above and a metal base to which the light irradiation module is fixed. In this case, it is preferable that the base has an anode terminal and a cathode terminal that are disposed to penetrate the base and supply power to the light irradiation module, the anode terminal being electrically connected to the anode pattern, and the cathode terminal being electrically connected to the cathode pattern. [Effects of the Invention]

[0017] As described above, the present invention provides a light irradiation module that can emit light of uniform intensity while reducing the number of parallel-connected LED elements, and also provides a light irradiation device that includes such a light irradiation module. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram illustrating a schematic configuration of a light irradiation device including an LED module according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the light irradiation device of FIG. 1 as seen obliquely from the front. [Figure 3] FIG. 3 is a diagram illustrating a schematic configuration of an LED module according to an embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing the configuration of a light source unit according to the prior art. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and their description will not be repeated.

[0020] FIG. 1 is a diagram illustrating a schematic configuration of a light irradiation device 10 including an LED module 100 (light irradiation module) according to an embodiment of the present invention, where FIG. 1(a) is a plan view and FIG. 1(b) is a cross-sectional view taken along line AA in FIG. 1(a). FIG. 2 is an exploded perspective view of the light irradiation device 10 of FIG. 1 as viewed obliquely from the front. FIG. 3 is a diagram illustrating the configuration of the LED module 100, where FIG. 3(a) is a plan view and FIG. 3(b) is an enlarged view of portion B (indicated by the dashed line) in FIG. 3(a). The gray areas in FIG. 3(b) indicate an anode pattern 131, a cathode pattern 133, and wiring patterns 141 to 153 formed on a substrate 105 of the LED module 100.

[0021] The light irradiation device 10 of this embodiment is a light source device that is mounted in a printing device, ultraviolet light irradiation device, or the like and cures ultraviolet-curable ink or ultraviolet-curable resin. For example, the light irradiation device 10 is positioned so that its front surface (the surface on which the LED module 100 is disposed) faces the target object, and emits ultraviolet light toward the target object. In this specification, as shown in FIG. 1 , the direction in which the LED (Light Emitting Diode) element 110 (described later) emits ultraviolet light is defined as the Z-axis direction, the longitudinal direction of the light irradiation device 10 is defined as the X-axis direction, and the direction perpendicular to the Z-axis direction and the X-axis direction (the transverse direction of the light irradiation device 10) is defined as the Y-axis direction. While ultraviolet light is generally defined as light with a wavelength of 400 nm or less, in this specification, ultraviolet light refers to light with a wavelength (e.g., wavelengths of 250 to 420 nm) that can cure ultraviolet-curable ink.

[0022] 1 and 2, the light irradiation device 10 of this embodiment includes two LED modules 100, a heat sink 200 (base), an anode terminal 300a and a cathode terminal 300b that supply power to each LED module 100, and a metal box-shaped case (not shown) that houses these. In this specification, the anode terminal 300a and the cathode terminal 300b are also collectively referred to as electrode member 300.

[0023] Each LED module 100 includes a rectangular substrate 105 (circuit board) defined by the X-axis direction and the Y-axis direction, and a plurality of LED elements 110 (light-emitting elements) on the substrate 105 (in FIG. 3, 19 elements (in the X-axis direction) × 7 rows (in the Y-axis direction), a total of 133 LED elements). Each substrate 105 has a pair of through holes 120 formed at positions corresponding to the electrode members 300 (FIGS. 1, 2, and 3). In this embodiment, two LED modules 100 are arranged and fixed on one end surface of a heat sink 200 (FIGS. 1 and 2). In this embodiment, thermal grease (not shown) is applied to the surface (substrate mounting surface) of the heat sink 200, and then the substrate 105 is mounted on the heat sink 200. This sandwiches the thermal grease between the back surface of the substrate 105 and the heat sink 200, thereby improving adhesion between the substrate 105 and the heat sink 200.

[0024] The heat sink 200 is a so-called air-cooled heat sink that is placed in close contact with the rear surface of the substrate 105 of the LED module 100 and dissipates heat generated by each LED element 110. The heat sink 200 is made of a material with good thermal conductivity such as aluminum or copper, and has a thin plate shape parallel to the XY plane. In addition, the heat sink 200 has through holes 211 formed therein that penetrate vertically (in the direction opposite to the Z-axis direction) from the surface of the heat sink 200 so as to communicate with each through hole 120 of the substrate 105, and an electrode member 300 is inserted into each through hole 211 (Figures 1(b) and 2).

[0025] The electrode member 300 of this embodiment includes an anode terminal 300a connected to the anode pattern 131 of the substrate 105 and a cathode terminal 300b connected to the cathode pattern 133, but since the specific configuration is the same, the following description will mainly focus on the cathode terminal 300b as a representative. As shown in Fig. 2, the electrode member 300 (cathode terminal 300b) of this embodiment is composed of an electrode rod 310 (electrode terminal), a fixing screw 320 (fixing member), and an insulating sleeve 330 (insulating member). The electrode rod 310 is a cylindrical metal member, and the insulating sleeve 330 is a cylindrical resin member that covers the outer periphery of the electrode rod 310. In this embodiment, the electrode rod 310 is inserted into and fixed in the insulating sleeve 330 (i.e., the insulating sleeve 330 is attached to the outer periphery of the electrode rod 310), and then inserted into the through-hole 211 of the heat sink 200 (FIGS. 1(b) and 2). When the electrode member 300 is attached to the through-hole 211, the tips of the electrode rod 310 and the insulating sleeve 330 are positioned approximately flush with the surface (mounting surface) of the heat sink 200 or are slightly recessed from the surface of the heat sink 200, and the base ends of the electrode rod 310 and the insulating sleeve 330 are positioned so as to protrude from the back surface of the heat sink 200 (FIG. 1(b)).

[0026] As described above, the light irradiation device 10 of this embodiment is assembled with the electrode members 300 attached to the through holes 211. That is, the heat sink 200 with the electrode members 300 attached to the through holes 211 is prepared, thermal grease is applied to the surface (mounting surface) of the heat sink 200, and each LED module 100 is mounted on it. Then, the through holes 120 of the substrate 105 are aligned so as to be positioned above (on the Z-axis direction) the electrode rods 310 (that is, so that the through holes 120 communicate with the through holes 211), and fixing screws 320 are attached to the through holes 120. When the fixing screw 320 is attached to the through hole 120, the threaded portion 321 (FIG. 2) of the fixing screw 320 screws into the threaded hole 310a (FIG. 1(b)) formed on the inner circumferential surface of the electrode rod 310, and the LED module 100 is sandwiched and fixed between the head of the fixing screw 320 and the heat sink 200 (FIG. 1(b)). When the LED module 100 is fixed by the fixing screw 320, the cathode pattern 133 of the substrate 105 is electrically connected to the electrode rod 310 via the fixing screw 320. Similarly, the anode pattern 131 of the substrate 105 is electrically connected to the electrode rod 310 via the fixing screw 320. Therefore, when a drive current for the LED element 110 is supplied from a driver circuit (not shown) connected to the pair of electrode rods 310, power is supplied to each LED module 100 via the anode pattern 131 and the cathode pattern 133.

[0027] As described above, in this embodiment, the electrode member 300 serves both to fix the substrate 105 and to supply power. Therefore, there is no need to provide a dedicated member for supplying power to the substrate 105, and the light irradiation device 10 can be made smaller. Furthermore, even when the LED module 100 needs to be replaced due to a malfunction of the LED module 100, the LED module 100 can be replaced simply by removing the fixing screws 320 (that is, there is no need to connect a dedicated member for supplying power to the LED module 100, or to perform wiring, etc.), so the LED module 100 can be replaced with a simple procedure.

[0028] 3, the substrate 105 of the LED module 100 of this embodiment is a rectangular ceramic substrate made of, for example, aluminum nitride, which has high thermal conductivity, and has an anode pattern 131 electrically connected to the anode terminal 300a formed on one end side in the Y-axis direction (the upper side in FIGS. 3(a) and 3(b)), and a cathode pattern 133 electrically connected to the cathode terminal 300b formed on the other end side in the Y-axis direction (the lower side in FIGS. 3(a) and 3(b)). In addition, thirteen wiring patterns 141 to 153 are formed in parallel in the X-axis direction between the anode pattern 131 and the cathode pattern 133.

[0029] The anode pattern 131 (first wiring pattern), the cathode pattern 133, and the wiring patterns 141 to 153 are thin films of metal (for example, copper or gold) that supply power to the LED element 110. As shown in FIG. 1(b), the anode pattern 131 is composed of a rectangular strip portion 131a (first linear portion) extending in the X-axis direction and ten protrusions 131b (first protrusions) that protrude in a rectangular shape from the strip portion 131a in the direction opposite to the Y-axis direction. The cathode pattern 133 also has a rectangular shape extending in the X-axis direction. In addition, the wiring patterns 141, 143, 145, 147, 149, 151, 153 (second wiring patterns) are composed of straight line portions 141a, 143a, 145a, 147a, 149a, 151a, 153a (second straight line portions) extending linearly in the X-axis direction, and nine second protruding portions 141b, 143b, 145b, 147b, 149b, 151b, 153b protruding in a rectangular shape in the Y-axis direction from each of the straight line portions 141a, 143a, 145a, 147a, 149a, 151a, 153a. Furthermore, the wiring patterns 142, 144, 146, 148, 150, 152 (first wiring patterns) are composed of straight line portions 142a, 144a, 146a, 148a, 150a, 152a (first straight line portions) extending linearly in the X-axis direction, and nine first protrusions 142b, 144b, 146b, 148b, 150b, 152b protruding in a rectangular shape from each straight line portion 142a, 144a, 146a, 148a, 150a, 152a in the direction opposite to the Y-axis direction. In this embodiment, the protrusion amount (protrusion distance in the Y-axis direction) and spacing (pitch in the X-axis direction) of each of the protrusions 131b, the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, 153b, and the first protrusions 142b, 144b, 146b, 148b, 150b, 152b are slightly larger than the size of the LED element 110, and one LED element 110 is arranged on each of the protrusions 131b, the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, 153b, and the first protrusions 142b, 144b, 146b, 148b, 150b, 152b.

[0030] In this embodiment, the protrusions 131b and the second protrusions 141b are arranged alternately along the X-axis direction, and the first row of LED elements 110a are arranged in a row along the X-axis direction on each of the protrusions 131b and the second protrusions 141b. In addition, the first protrusions 142b and the second protrusions 143b are arranged alternately along the X-axis direction, and the second row of LED elements 110b are arranged in a row along the X-axis direction on each of the first protrusions 142b and each of the second protrusions 143b. In addition, the first protrusions 144b and the second protrusions 145b are arranged alternately along the X-axis direction, and the third row of LED elements 110c are arranged in a row along the X-axis direction on each of the first protrusions 144b and each of the second protrusions 145b. In addition, the first protrusions 146b and the second protrusions 147b are arranged alternately along the X-axis direction, and the fourth row of LED elements 110d are arranged in a row along the X-axis direction on each of the first protrusions 146b and each of the second protrusions 147b. In addition, the first protrusions 148b and the second protrusions 149b are arranged alternately along the X-axis direction, and the fifth row of LED elements 110e are arranged in a row along the X-axis direction on each of the first protrusions 148b and each of the second protrusions 149b. In addition, the first protrusions 150b and the second protrusions 151b are arranged alternately along the X-axis direction, and the sixth row of LED elements 110f are arranged in a row along the X-axis direction on each of the first protrusions 150b and each of the second protrusions 151b. In addition, the first protrusions 152b and the second protrusions 153b are arranged alternately along the X-axis direction, and the seventh row of LED elements 110g are arranged in a row along the X-axis direction on each of the first protrusions 152b and each of the second protrusions 153b.

[0031] Thus, in this embodiment, the anode pattern 131 and wiring patterns 142, 144, 146, 148, 150, 152 (first wiring pattern) having protrusions 131b and first protrusions 142b, 144b, 146b, 148b, 150b, 152b that protrude in the direction opposite to the Y-axis direction, and the wiring patterns 141, 143, 145, 147, 149, 151, 153 (second wiring pattern) having second protrusions 141b, 143b, 145b, 147b, 149b, 151b, 153b that protrude in a rectangular shape in the Y-axis direction are arranged alternately in the direction opposite to the Y-axis direction. Furthermore, the protrusions 131b and first protrusions 142b, 144b, 146b, 148b, 150b, 152b of each anode pattern 131 and wiring patterns 142, 144, 146, 148, 150, 152 (first wiring patterns), and the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, 153b of each wiring pattern 141, 143, 145, 147, 149, 151, 153 (second wiring patterns) adjacent in the direction opposite to the Y-axis direction, are arranged alternately along the X-axis direction. In this embodiment, the protrusions 131b and the first protrusions 142b, 144b, 146b, 148b, 150b, and 152b are arranged in ten rows in the Y-axis direction, and the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, and 153b are arranged in nine rows in the Y-axis direction, and the multiple (133) LED elements 110 on the substrate 105 are densely arranged in a square lattice pattern overall (i.e., aligned in the X-axis and Y-axis directions).

[0032] Each LED element 110 has a rectangular shape in plan view, e.g., 2.0 mm (length in the X-axis direction) × 2.0 mm (length in the Y-axis direction) (FIGS. 3(a) and 3(b)), and includes a cathode terminal (second electrode) on its upper surface and an anode terminal (first electrode) on its lower surface. The anode terminal is bonded to the directly underlying protrusion 131b, first protrusions 142b, 144b, 146b, 148b, 150b, 152b, or second protrusions 141b, 143b, 145b, 147b, 149b, 151b, 153b via a die-bonding agent (not shown). The die-bonding agent is a material for mechanically and electrically bonding the LED element 110 to the wiring patterns 141 to 153 or the anode pattern 131, and is made of, for example, a conductive silver (Ag) paste. The cathode terminal of each LED element 110 is electrically connected via a wire 112 to the linear portions 141a to 153a of the wiring patterns 141 to 153 or the cathode pattern 133 adjacent in the direction opposite to the Y-axis direction.

[0033] In this manner, in this embodiment, the LED elements 110 are arranged on each of the protrusions 131b, the first protrusions 142b, 144b, 146b, 148b, 150b, 152b and the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, 153b, so that the LED elements 110 are densely arranged in a square lattice pattern overall (i.e., aligned in the X-axis direction and the Y-axis direction). Therefore, the intensity of the ultraviolet light emitted from the LED element 110 is approximately uniform in the X-axis direction and the Y-axis direction. Therefore, even if the object to be irradiated does not move at a constant speed relative to the LED module 100 (i.e., when ultraviolet light is irradiated onto a fixed object to be irradiated, or when ultraviolet light is irradiated onto an object to be irradiated that moves at a random speed), there will be no unevenness in the intensity of the ultraviolet light, and there will be no uneven curing of the ultraviolet-curable ink or ultraviolet-curable resin on the object to be irradiated. Furthermore, in this embodiment, the number of LED elements 110a to 110g in each column is 19, but the LED elements 110a to 110g in each column are composed of 10 LED elements 110 arranged in parallel on the protrusion 131b or the first protrusions 142b, 144b, 146b, 148b, 150b, and 152b, and 9 LED elements 110 arranged in parallel on the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, and 153b. Therefore, the number of LED elements 110 connected in parallel is not more than necessary (since it is about half the number compared to when 19 elements are connected in parallel), the total driving current (If) of the LED elements 110 (i.e., current consumption) does not increase, and the power supply device that supplies the driving current does not become larger. In addition, in this embodiment, adjacent wiring patterns 142, 144, 146, 148, 150, 152 (first wiring patterns) and adjacent wiring patterns 141, 143, 145, 147, 149, 151, 153 (second wiring patterns) in the direction opposite to the Y-axis direction are sequentially connected in series, but the potential difference between adjacent patterns is the operating voltage of one LED element 110 (approximately 4 to 5 V), so the possibility of migration occurring between adjacent patterns is reduced.

[0034] The above is a description of the embodiment of the present invention, but the present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope of the technical concept thereof.

[0035] For example, in the LED module 100 of this embodiment, 40 LED elements 110 are densely arranged in a square lattice pattern of 19 elements (X-axis direction) x 7 rows (Y-axis direction), but there is no limit to the number of LED elements 110 or the number of rows, and they can be selected appropriately depending on the specifications. Furthermore, the LED elements 110 do not necessarily need to be densely arranged in a square lattice pattern. For example, the length in the Y-axis direction of each of the protrusions 131b and first protrusions 142b, 144b, 146b, 148b, 150b, and 152b and the length in the Y-axis direction of each of the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, and 153b may be set long, and the positions in the Y-axis direction of the LED elements 110 arranged on each of the protrusions 131b or first protrusions 142b, 144b, 146b, 148b, 150b, and 152b may be relatively different from the positions in the Y-axis direction of the LED elements 110 arranged on each of the second protrusions 141b, 143b, 145b, 147b, 149b, 151b, and 153b. According to such a configuration, the degree of freedom in arranging the LED elements 110 in the Y-axis direction increases, and it becomes possible to flexibly respond to changes in the specifications and design of the LED module 100.

[0036] Furthermore, although the LED element 110 of this embodiment has been described as emitting ultraviolet light, it is not limited to such a configuration, and for example, the LED element 110 may emit light in the visible or infrared range. Furthermore, the LED elements 110 of this embodiment do not necessarily need to emit light of a single wavelength. For example, LED elements emitting light of a first wavelength (e.g., 385 nm) may be arranged on each of the protrusions 131 b and the first protrusions 142 b, 144 b, 146 b, 148 b, 150 b, and 152 b, and LED elements emitting light of a second wavelength (e.g., 405 nm) may be arranged on each of the second protrusions 141 b, 143 b, 145 b, 147 b, 149 b, 151 b, and 153 b. With this configuration, the LED elements of the first wavelength and the LED elements of the second wavelength are arranged alternately in the X-axis direction, making it possible to easily mix light of the first wavelength and light of the second wavelength.

[0037] Furthermore, the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0038] 1: Substrate (conventional technology) 2: Band wiring (conventional technology) 3: LED element (conventional technology) 4: Top electrode (conventional technology) 5: Wire (conventional technology) 10:Light irradiation device 100: LED module 105: Substrate 110: LED element 112: Wire 120: Through hole 131: Anode pattern 131a: Belt 131b:Protrusion 133: Cathode pattern 141: Wiring pattern 141a: Straight section 141b: Second protrusion 142: Wiring pattern 142a: Straight section 142b: 1st protrusion 143: Wiring pattern 143a: Straight section 143b: Second protrusion 144: Wiring pattern 144a: Straight section 144b: 1st protrusion 145: Wiring pattern 145a: Straight section 145b: Second protrusion 146: Wiring pattern 146a: Straight section 146b: 1st protrusion 147: Wiring pattern 147a: Straight section 147b: Second protrusion 148: Wiring pattern 148a: Straight section 148b: 1st protrusion 149: Wiring pattern 149a: Straight section 149b: Second protrusion 150: Wiring pattern 150a: Straight section 150b: 1st protrusion 151: Wiring pattern 151a: Straight section 151b: Second protrusion 152: Wiring pattern 152a: Straight section 152b: 1st protrusion 153: Wiring pattern 153a: Straight section 153b: Second protrusion 200: Heat sink 211: Through hole 300: Electrode material 300a: Anode terminal 300b: Cathode terminal 310: Electrode rod 310a: screw hole 320: Fixing screw 321: Threaded part 330: Insulating sleeve

Claims

1. A light irradiation module including: a substrate defined by a first direction and a second direction orthogonal to the first direction; a plurality of wiring patterns formed on the substrate; and a plurality of LED elements arranged on the plurality of wiring patterns, the LED elements emitting light in a third direction orthogonal to the first direction and the second direction, The plurality of wiring patterns include: at least one or more first wiring patterns each having a first linear portion extending in the first direction and a plurality of first protruding portions protruding from the first linear portion in a direction opposite to the second direction at predetermined intervals in the first direction; at least one or more second wiring patterns each having a second linear portion extending in the first direction and a plurality of second protruding portions protruding in the second direction from the second linear portion at predetermined intervals in the first direction; Including, the plurality of first protrusions of each of the first wiring patterns and the plurality of second protrusions of the second wiring patterns adjacent to each other in a direction opposite to the second direction are alternately arranged along the first direction; A light irradiation module characterized by:

2. An optical irradiation module as described in claim 1, characterized in that the first wiring pattern and the second wiring pattern are arranged alternately along a direction opposite to the second direction.

3. The plurality of LED elements are arranged on the first protrusion and the second protrusion, 2. The light irradiation module according to claim 1, wherein the first electrode of each of the LED elements is electrically connected to the first protrusion or the second protrusion directly below, and the second electrode of each of the LED elements is electrically connected via a wire to the second straight portion or the first straight portion adjacent to the second direction opposite to the second direction.

4. 4. The light irradiation module according to claim 1, wherein the plurality of LED elements arranged on the plurality of first protrusions of each of the first wiring patterns and the plurality of LED elements arranged on the plurality of second protrusions of the second wiring pattern adjacent to each other in a direction opposite to the second direction are aligned in a substantially straight line along the first direction.

5. the wiring pattern located closest to the second direction forms an anode pattern that supplies current to the plurality of LED elements, and the wiring pattern located closest to the second direction forms a cathode pattern through which return current from the plurality of LED elements flows; the substrate has a pair of through holes that vertically penetrate the substrate from the anode pattern and the cathode pattern, respectively; 4. The light irradiation module according to claim 1, further comprising a pair of fixing members inserted into the pair of through holes, and power is supplied to the anode pattern and the cathode pattern via the pair of fixing members.

6. the plurality of LED elements arranged on the first protrusion emit light of a first wavelength; 4. The light irradiation module according to claim 1, wherein the plurality of LED elements arranged on the second protrusion emit light having a second wavelength different from the first wavelength.

7. The light irradiation module according to any one of claims 1 to 6, a metal base to which the light irradiation module is fixed; A light irradiation device comprising:

8. the base has an anode terminal and a cathode terminal that are disposed to penetrate the base and supply power to the light irradiation module; the anode terminal is electrically connected to the anode pattern; The cathode terminal is electrically connected to the cathode pattern. The light irradiation device according to claim 7, which cites claim 5.

Images