JP2017159657A - Light irradiation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation device which is a thin type and has a light weight, and which can effectively cool an LED.SOLUTION: A light irradiation device, which irradiates an irradiation surface with line-like light extending in a first direction, comprises: a slender substrate extending in the first direction; plural LED light sources which are juxtaposed on a surface of the substrate; heat transportation means of which at least a part contacts the substrate, and which extends in a second direction orthogonal to the first direction from the substrate and transports heat generated in the LED light source in the second direction; heat radiation means which projects in a third direction orthogonal to the first direction and the second direction from heat transportation means, and has plural heat radiation fins extended in the second direction; a reflection member which is positioned on the irradiation surface side with respect to the LED light source, and reflects light outgoing from the LED light source; and a support member which is thermally connected to the reflection member, and supports the reflection member. The support member is thermally connected to the heat transportation means.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a light irradiation device that includes an LED (Light Emitting Diode) as a light source and emits line-shaped light, and more particularly to a light irradiation device that includes a heat dissipation member that radiates heat generated from an LED.

  2. Description of the Related Art Conventionally, printing apparatuses that perform printing using UV ink that is cured by irradiation with ultraviolet light are known. In such a printing apparatus, after ejecting ink from the nozzles of the head onto the medium, the dots formed on the medium are irradiated with ultraviolet light. Since the dots are cured and fixed on the medium by irradiation with ultraviolet light, good printing can be performed even on a medium that hardly absorbs liquid. Such a printing apparatus is described in Patent Document 1, for example.

  Patent Document 1 discloses a transport unit that transports a print medium, six heads that are arranged in the transport direction and discharge color inks of cyan, magenta, yellow, black, orange, and green, and downstream in the transport direction between the heads. 6 temporary curing irradiation units that are disposed on the side and temporarily cure (pinning) the dot ink ejected from each head onto the printing medium, and the main curing irradiation unit that permanently cures the dot ink and fixes it to the printing medium. And a printing device comprising: The printing apparatus described in Patent Document 1 suppresses bleeding between color inks and spread of dots by curing the dot ink in two stages of temporary curing and main curing.

  The pre-curing irradiation unit described in Patent Document 1 is a so-called ultraviolet light irradiation device that is disposed above a print medium and irradiates the print medium with ultraviolet light, and emits linear ultraviolet light in the width direction of the print medium. Irradiate. In the temporary curing irradiation unit, LEDs are used as a light source in order to reduce the weight and size of the printing apparatus itself, and a plurality of LEDs are arranged along the width direction of the print medium.

JP 2013-252720 A

  When an LED is used as a light source as in the pre-curing irradiation section described in Patent Document 1, since most of the input electric power becomes heat, there is a problem that luminous efficiency and life are reduced by heat generated by the LED itself. Will occur. In addition, such a problem becomes more serious in the case of an apparatus in which a plurality of LEDs are mounted, such as a pre-curing irradiation unit, because the number of LEDs serving as a heat source increases. For this reason, in the light irradiation apparatus which uses LED as a light source, the structure which suppresses heat_generation | fever of LED is generally taken using heat radiating members, such as a heat sink.

  In order to suppress the heat generation of the LED, it is effective to use a heat radiating member such as a heat sink. However, in order to efficiently dissipate the heat of the LED, it is necessary to increase the surface area of the heat dissipating member as much as possible, and there is a problem that if the heat dissipating member is enlarged, the entire device becomes large. In particular, when a large heat radiating member is applied to the light irradiation device disposed between the heads as in the pre-curing irradiation unit of Patent Document 1, the distance between the heads must be increased, and the printing device itself The problem of increasing the weight and size of the device becomes more serious.

  This invention is made | formed in view of said situation, and it aims at providing a thin and lightweight light irradiation apparatus, cooling LED efficiently.

  In order to achieve the above object, a light irradiation apparatus of the present invention is a light irradiation apparatus that irradiates line-shaped light extending in a first direction on an irradiation surface, an elongated substrate extending in the first direction, and a substrate A plurality of LED (Light Emitting Diode) light sources that are arranged at predetermined intervals along the first direction on the surface of the substrate, and at least a part of the LED (Light Emitting Diode) light source emits line-shaped light. A heat transport means extending in a second direction perpendicular to the LED light source and transporting heat generated in the LED light source in the second direction; projecting from the heat transport means in a first direction and a third direction perpendicular to the second direction; A heat dissipating means having a plurality of heat dissipating fins extending in the direction, a reflecting member that is positioned closer to the irradiation surface than the LED light source, reflects light emitted from the LED light source, and is thermally coupled to the reflecting member; And a support member that supports the reflecting member. Member, characterized in that it is thermally coupled to the heat transporting means.

  According to such a configuration, since the heat generated by the LED light source is transported in the second direction and dissipated, a light irradiation device that is thin in the third direction is realized. Moreover, since the reflecting member is thermally coupled to the heat transporting means via the support member, the reflecting member is cooled. Then, by cooling the reflecting member, the air around the reflecting member is cooled and the air around the LED light source is also cooled, so that the heat of the LED light source is efficiently radiated (that is, the heat generation of the LED light source is suppressed). It becomes possible.

In addition, it is possible to provide a box-shaped housing that is thin in the third direction and that accommodates the substrate, the heat transport means, and the heat dissipation means, and forms a wind tunnel in the region where the heat dissipation means is formed.
Further, in the second direction, there can be provided a centrifugal fan that is disposed between the substrate and the heat radiating means, guides air from the outside to the wind tunnel, and generates an air flow in the second direction in the wind tunnel.
In addition, the housing has an intake port for taking in air from the outside on at least one of the one surface facing the virtual surface formed by the tips of the plurality of radiating fins or the two surfaces facing the first direction. However, it can be configured to take in air from the inlet.

  Further, it is desirable that the width of the heat transport means in the first direction is substantially equal to the width of the substrate in the first direction.

  In addition, it is desirable that the base end portion of the heat transport means is bent in an L shape, and the base end portion is thermally coupled to the back surface of the substrate.

  The light irradiation device further includes a support block that is thermally coupled to the back surface of the substrate and supports the substrate, and the heat transport means includes a first heat transport means and a first heat transport means in the second direction. Second heat transporting means smaller than the first heat sink having heat dissipating fins on the first heat transporting means and second heat sink having heat dissipating fins on the second heat transporting means. It is preferable that the support block is provided so as to be sandwiched between the base end portion of the first heat transport means and the base end portion of the second heat transport means.

  Moreover, it is desirable to provide a drive circuit for driving the LED light source between the centrifugal fan and the heat dissipation means.

  Moreover, it is desirable that the heat transport means is formed of a plate-like heat pipe extending in the first direction and the second direction.

  Further, it is desirable that the heat transport means is formed by arranging a plurality of rod-like heat pipes extending in the second direction in the first direction.

  Moreover, a board | substrate can be arrange | positioned on the plane specified by a 1st direction and a 3rd direction, and it can comprise so that the optical axis of each LED light source may face the direction contrary to a 2nd direction. In this case, the LED light sources are preferably arranged in N columns (N is an integer of 2 or more) along the third direction when the substrate is viewed in plan.

  Moreover, a board | substrate can be arrange | positioned on the plane specified by a 1st direction and a 2nd direction, and it can comprise so that the optical axis of each LED light source may face a 3rd direction. In this case, the LED light sources are preferably arranged in N rows (N is an integer of 2 or more) along the second direction when the substrate is viewed in plan.

  The centrifugal fan includes a first centrifugal fan having a fan that rotates counterclockwise and a second centrifugal fan having a fan that rotates clockwise. The first centrifugal fan and the second centrifugal fan are It is desirable to arrange them side by side in one direction.

  Further, it is desirable that the light includes light having a wavelength that acts on the ultraviolet curable resin.

  As described above, according to the present invention, a thin and lightweight light irradiation device can be realized while efficiently cooling an LED.

It is an external view of the light irradiation apparatus which concerns on the 1st Embodiment of this invention. It is a figure explaining the internal structure of the light irradiation apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing explaining the internal space of the heat pipe with which the light irradiation apparatus which concerns on the 1st Embodiment of this invention is equipped. It is a figure explaining the modification of the heat pipe with which the light irradiation apparatus which concerns on the 1st Embodiment of this invention is equipped. It is a figure explaining the internal structure of the light irradiation apparatus which concerns on the 2nd Embodiment of this invention. It is a figure explaining the internal structure of the light irradiation apparatus which concerns on the 3rd Embodiment of this invention. It is a figure explaining the internal structure of the light irradiation apparatus which concerns on the 4th Embodiment of this invention. It is an external view of the light irradiation apparatus which concerns on the 5th Embodiment of this invention. It is a figure explaining the internal structure of the light irradiation apparatus which concerns on the 5th 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 an equivalent part in a figure, and the description is not repeated.

(First embodiment)
FIG. 1 is an external view of the light irradiation apparatus 1 according to the first embodiment of the present invention, and FIG. 1A is a top view of the light irradiation apparatus 1. FIG. 1B is a front view of the light irradiation device 1, and FIG. 1C is a bottom view of the light irradiation device 1. The light irradiation device 1 of the present embodiment is a light source device that is mounted on a printing device or the like and cures an ultraviolet curable ink or an ultraviolet curable resin. Line-shaped ultraviolet light is emitted. In the present specification, as shown in the coordinates of FIG. 1, the LED (Light Emitting Diode) element 210 described later emits ultraviolet light in the Z-axis direction, the arrangement direction of the LED elements 210 is the X-axis direction, A direction perpendicular to the Z-axis direction and the X-axis direction is defined as the Y-axis direction.

  As shown in FIG. 1, the light irradiation apparatus 1 of the present embodiment includes a thin box-shaped case 100 (housing) that accommodates a light source unit 200, a heat radiating member 400, and the like. The case 100 includes a glass window 105 through which ultraviolet light is emitted on the bottom surface. In addition, intake ports 101 and 102 for taking in air from the outside are formed on the front surface of the case 100 (one surface facing a virtual surface formed by tips of a plurality of radiating fins 430a described later). An exhaust port 103 for exhausting the air is formed. A connector 104 for supplying power to the light irradiation device 1 is provided on the upper surface of the case 100. The connector 104 and a power supply device (not shown) are connected by a cable 110, and the light irradiation device 1 is supplied with power. Is to be supplied.

  FIG. 2 is a diagram illustrating an internal configuration of the light irradiation apparatus 1 according to the embodiment of the present invention, and FIG. 2A is a front perspective view when the light irradiation apparatus 1 is viewed from the front. FIG. 2B is a side perspective view of the light irradiation device 1 when viewed from the right side. In FIG. 2B, the internal wiring cable 106 in FIG. 2A is omitted for easy understanding of the drawing.

  As shown in FIG. 2, the light irradiation device 1 of the present embodiment includes a light source unit 200, a heat radiating member 400, two centrifugal fans 501 and 502, and the like inside the case 100.

  As shown in FIGS. 2A and 2B, the light source unit 200 includes a rectangular substrate 205 parallel to the X-axis direction and the Y-axis direction, and twelve LED elements 210 having the same characteristics. It is fixed on one end surface (surface facing the bottom surface side of the case 100) of a metal (for example, copper, aluminum) support plate 107 extending in the X-axis direction in the case 100.

  The twelve LED elements 210 are arranged in a line on the surface of the substrate 205 at a predetermined interval in the X-axis direction with the optical axes aligned in the Z-axis direction, and are electrically connected to the substrate 205. Yes. Further, the substrate 205 is electrically connected to a part of the internal wiring cable 106 extending from the connector 104, and a driving current is supplied to each LED element 210 from a power supply device (not shown). . When a drive current is supplied to each LED element 210, each LED element 210 emits ultraviolet light (for example, wavelength 365 nm) with a light amount corresponding to the drive current, and a line parallel to the X-axis direction from the light source unit 200. Shaped ultraviolet light is emitted.

  As shown in FIGS. 1 and 2, in the present embodiment, a reflective member 108 is provided between the light source unit 200 and the window portion 105. The reflecting member 108 has four mirror surfaces 108 a, 108 b, 108 c, and 108 d arranged so as to surround the optical paths of the twelve LED elements 210. Each mirror surface 108 a, 108 b, 108 c, 108 d is spread with respect to the ultraviolet light emission direction (that is, the Z-axis direction), whereby the ultraviolet light emitted from each LED element 210 with a predetermined spread angle. The optical path is regulated and guided so that ultraviolet light of a predetermined intensity is irradiated substantially perpendicularly to a desired irradiation region. Then, the ultraviolet light guided by the reflecting member 108 is emitted from the light irradiation device 1 through the window portion 105. Note that each LED element 210 of the present embodiment has a drive current supplied to each LED element 210 adjusted so as to emit a substantially uniform amount of ultraviolet light, and a linear shape emitted from the light source unit 200. The ultraviolet light has a substantially uniform light amount distribution in the X-axis direction.

  The heat radiating member 400 is a member that radiates heat generated from the light source unit 200. The heat radiating member 400 of the present embodiment has one end closely attached to and fixed to the other end surface of the support plate 107 (the surface facing the upper surface side of the case 100), and transports heat generated by each LED element 210. 410 (heat transporting means) and a heat sink 430 (heat dissipating means) composed of a plurality of heat dissipating fins 430a fixed in close contact with the heat pipe 410 (FIGS. 2A and 2B). ).

  The heat pipe 410 has a metal (for example, copper, aluminum, iron, magnesium, etc.) having an internal space (not shown in FIG. 2) in which a working fluid (for example, water, alcohol, ammonia, etc.) is sealed under reduced pressure. A plate-like member). As shown in FIG. 2B, the heat pipe 410 of this embodiment is bent in an L-shaped cross section so that one end portion on the substrate 205 side is along the other end surface of the support plate 107, and the XZ plane. And a bent portion 410b parallel to the XY plane. The bent portion 410b is fixed in close contact with the other end surface of the support plate 107 by a fixing tool or an adhesive (not shown) and is thermally coupled to the substrate 205.

  FIG. 3 is a cross-sectional view illustrating the internal space of the heat pipe 410 of the present embodiment. In FIG. 3, for convenience of explanation, the bent portion 410b is shown on the same plane as the flat portion 410a. As shown in FIG. 3, the internal space of the heat pipe 410 of the present embodiment extends in the Z-axis direction continuously from the bent portion 410b in the Z-axis direction, and is aligned with a predetermined interval in the X-axis direction. The pipe-shaped space 410z and two pipe-shaped spaces 410x that connect the spaces 410z in the X-axis direction are configured. Then, when the hydraulic fluid moves in the space 410z, heat is transported in the Z-axis direction (direction opposite to the direction in which the ultraviolet light is emitted) from the bent portion 410b (details will be described later). In this embodiment, since the working fluid moves also in the X-axis direction through the space 410x, the heat pipe 410 moves along the X-axis direction and the Z-axis direction (that is, along the XZ plane). Transports heat approximately evenly.

  The plurality of radiating fins 430a constituting the heat sink 430 are members of a rectangular plate metal (for example, a metal such as copper, aluminum, iron, magnesium, or an alloy containing these). As shown in FIGS. 2 (a) and 2 (b), each radiating fin 430a of this embodiment is brazed to one surface of the flat portion 410a of the heat pipe 410 (the surface on the side where the bent portion 410b is bent). The heat pipe 410 is erected so as to protrude from the flat surface portion 410a in the Y-axis direction, and the heat transmitted to the heat pipe 410 is dissipated into the air. Although details will be described later, in the present embodiment, air is taken into the case 100 from the outside by the centrifugal fans 501 and 502, and the air flow in the Z-axis direction so that the taken-in air flows on the surface of the radiation fin 430a. The radiating fins 430a extend so as to extend in the Z-axis direction. Further, the heat dissipating fins 430a of the present embodiment are divided into a plurality (six) in the Z-axis direction. Further, the protruding amount of the radiating fin 430 a (the size of the radiating fin 430 a) is set so as not to contact the inner surface of the case 100.

  When a drive current flows through each LED element 210 and ultraviolet light is emitted from each LED element 210, the temperature rises due to self-heating of the LED elements 210, but the heat generated in each LED element 210 is supported by the substrate 205 and the support. It quickly conducts (moves) to the bent portion 410b of the heat pipe 410 via the plate 107. When the heat moves to the bent portion 410b of the heat pipe 410, the working fluid in the heat pipe 410 absorbs the heat and evaporates, and the vapor of the working fluid moves through the internal space. Moves to the plane portion 410a. And the heat which moved to the plane part 410a moves to the several radiation fin 430a couple | bonded with the plane part 410a further, and is thermally radiated in the air from each radiation fin 430a. When heat is radiated from the heat radiation fins 430a, the temperature of the flat surface portion 410a also decreases, so that the vapor of the working fluid in the flat surface portion 410a is also cooled to return to the liquid and moves to the bent portion 410b. The hydraulic fluid that has moved to the bent portion 410b is used to newly absorb heat conducted through the substrate 205 and the support plate 107.

  As described above, in the present embodiment, the heat generated in each LED element 210 quickly moves to the radiation fins 430a by circulating the working fluid in the heat pipe 410 between the bent portion 410b and the flat portion 410a. In addition, heat is efficiently radiated from the radiating fins 430a into the air.

  Centrifugal fans 501 and 502 are so-called sirocco centrifugal fans having a rotation axis in the Y-axis direction, take in air in the Y-axis direction from outside, and blow in the centrifugal direction. When the centrifugal fans 501 and 502 are rotated, an airflow in the Z-axis direction is generated in the case 100, and the air heated by the radiating fins 430a is discharged to the outside and each radiating fin 430a is cooled. As shown in FIGS. 2A and 2B, the centrifugal fans 501 and 502 of the present embodiment are arranged in the space between the light source unit 200 and the radiation fins 430 a on the flat portion 410 a of the heat pipe 410. It is arranged side by side along the axial direction. The suction ports 501a and 502a of the centrifugal fans 501 and 502 are provided at positions corresponding to the suction ports 101 and 102, respectively (FIG. 1), and the exhaust ports 501b and 502b are directed toward the exhaust port 103. . Therefore, when the centrifugal fans 501 and 502 rotate, external air is taken into the case 100 through the intake ports 101 and 102, and the air in the case 100 is exhausted from the exhaust port 103. That is, in the case 100, an air flow (air flow) indicated by a solid arrow in FIG. 2B is generated, and the air taken into the case 100 from the intake ports 101 and 102 is connected to the heat pipe 410. A space surrounded by the case 100 (that is, a space in which the radiation fins 430a are provided) flows in the Z-axis direction (a direction opposite to the direction in which the ultraviolet light is emitted). For this reason, the heat (indicated by dotted arrows in FIG. 2B) generated in each LED element 210 and transferred to each radiation fin 430a through the substrate 205, the support plate 107, and the heat pipe 410 is each. The heat is dissipated into the air around the heat dissipating fins 430a, and is released to the outside as the air moves.

  As described above, in this embodiment, the case 100 and the heat pipe 410 constitute a kind of wind tunnel, and the airflow fins 430a are efficiently cooled by limiting the space through which the airflow flows. Further, in the present embodiment, thin centrifugal fans 501 and 502 that are thin and in which the direction of the intake ports 501a and 502a and the direction of the exhaust ports 501b and 502b are orthogonal are employed, and these are used as the light source unit 200 and the heat radiation fins 430a. By arranging between the two, the heat radiation fins 430a are efficiently cooled, and the light irradiation device 1 is also made thinner.

  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, in the present embodiment, the substrate 205 and the heat pipe 410 are joined via the support plate 107, but the support plate 107 is not always necessary, and the substrate 205 and the heat pipe 410 are joined directly. It is good also as a structure.

  Further, in the light irradiation device 1 of the present embodiment, the ultraviolet light is emitted in the Z-axis direction from the bottom surface of the case 100. For example, the substrate 205 is disposed in parallel to the XZ plane, and the case 100 It can also be set as the structure which radiate | emits an ultraviolet light in a Y-axis direction from a front surface or a back surface. In this case, the heat pipe 410 does not need to have the bent portion 410b, and a flat plate made of only the flat portion 410a can be applied.

  Moreover, although the light irradiation apparatus 1 of this embodiment was set as the apparatus which irradiates ultraviolet light, it is not limited to such a structure, Irradiation light (For example, visible light, such as white light, such as white light), It is not limited to such a structure. The present invention can also be applied to an apparatus that irradiates infrared light or the like.

  Further, in the present embodiment, each radiating fin 430a is directly brazed to the flat portion 410a of the heat pipe 410, but a plurality of radiating fins 430a are formed on the base, and the base is the flat portion. It is good also as a structure fixed to 410a. In this case, a high thermal conductivity graphite sheet can be provided between the heat pipe 410 and the base, or silicon grease can be applied to further increase the adhesion between the two.

  Moreover, although each radiation fin 430a of this embodiment was extended so that it might extend in a Z-axis direction, since the centrifugal fans 501,502 blow in the centrifugal direction, depending on the position of each radiation fin 430a. The wind direction (airflow direction) does not necessarily match the extending direction of the heat dissipating fins 430a. Therefore, even if each radiating fin 430a is inclined with respect to the Z-axis direction in accordance with the position of each radiating fin 430a so that the wind direction (the direction of the airflow) and the extending direction of the radiating fin 430a coincide with each other. Good. According to such a configuration, the extending direction of each radiating fin 430a is parallel to the wind direction (the direction of the airflow), so that it is possible to efficiently cool.

  In the present embodiment, the configuration using the two centrifugal fans 501 and 502 is shown. However, it is sufficient if an air flow can be generated in the wind tunnel formed by the case 100 and the heat pipe 410. It may also be configured by three or more centrifugal fans.

  In the present embodiment, a configuration in which twelve LED elements 210 are arranged in a line on the substrate 205 is shown. However, the number of LED elements 210 can be changed as appropriate according to the specification. It is also possible to arrange 210 in N columns (N is an integer of 2 or more) along the Y-axis direction.

  Moreover, although the heat pipe 410 of the present embodiment is a plate-like member having a pipe-like internal space, it is not limited to such a configuration. FIG. 4 is a view showing a modification of the heat pipe 410 of the present embodiment. The heat pipe 410A according to this modification is different from the heat pipe 410 of the present embodiment in that it is composed of a plurality of rod-like heat pipes 412 extending in the Z-axis direction instead of the space 410z (FIG. 3). Like the heat pipe 410 of this embodiment, each rod-like heat pipe 412 is bent in an L shape so that one end portion on the substrate 205 side is along the other end surface of the support plate 107, and is parallel to the XY plane. It has a bent portion 410b. Further, the rod-like heat pipes 412 are arranged in the X-axis direction at a predetermined interval, and have a flat portion 410a parallel to the XZ plane. According to such a configuration, the hydraulic fluid moves in the rod-shaped heat pipe 412, and thus, similarly to the heat pipe 410 of the present embodiment, the Z-axis direction (opposite to the direction in which ultraviolet light is emitted) from the bent portion 410b. Heat) in the direction). In this modification, since it is difficult to directly form the radiation fins 430a on the rod-shaped heat pipe 412, for example, a connecting plate (not shown) that couples the rod-shaped heat pipes 412 in the X-axis direction. And the radiation fins 430a are provided on the connection plate.

(Second Embodiment)
FIG. 5 is a diagram illustrating the internal configuration of the light irradiation apparatus 1A according to the second embodiment of the present invention, and FIG. 5A is a front perspective view of the light irradiation apparatus 1A as viewed from the front. . FIG. 5B is a side perspective view of the light irradiation apparatus 1A as viewed from the right side. In FIG. 5 (b), the internal wiring cable 106 of FIG. 5 (a) is omitted for easy understanding of the drawing.

  As shown in FIG. 5, the light irradiation apparatus 1 </ b> A of the present embodiment is the first implementation in that it includes a reflection member 108, a support member 109 that supports the window portion 105, and two heat pipes 440 and 460. It differs from the light irradiation apparatus 1 of a form. Moreover, the support block 107A of this embodiment is thicker than the support plate 107 of 1st Embodiment, and is different from the light irradiation apparatus 1 of 1st Embodiment by the point currently formed in square pillar shape.

  The support member 109 is a member arranged so as to constitute the bottom surface portion of the case 100. The support member 109 has a quadrangular prism shape extending along the X-axis direction, and is formed of a metal having high thermal conductivity (for example, copper or aluminum). The support member 109 is formed with openings 109a in regions facing the twelve LED elements 210, and ultraviolet light from each LED element 210 is emitted through the openings 109a. The opening 109a has four tapered surfaces that expand in the ultraviolet light emission direction (that is, the Z-axis direction). By fitting the reflecting member 108 into the opening 109a, each mirror surface is formed on each tapered surface. 108a, 108b, 108c and 108d are arranged. A window portion 105 is attached to the distal end side of the support member 109 (the lower side in FIGS. 5A and 5B). As in the first embodiment, ultraviolet light emitted from each LED element 210 is incident on each mirror surface 108a, 108b, 108c, 108d and window portion 105 of the support member 109, but each mirror surface 108a, 108b, Since 108c and 108d and the window part 105 become high temperature when exposed to ultraviolet light, in this embodiment, the heat of the mirror surfaces 108a, 108b, 108c and 108d and the window part 105 is quickly increased by the support member 109. The heat pipes 440 and 460 are configured to conduct heat (details will be described later).

  As shown in FIG. 5B, the support block 107A of the present embodiment is thicker than the support plate 107 of the first embodiment and is formed in a quadrangular prism shape. Therefore, the heat capacity of the support block 107A of this embodiment is larger than the heat capacity of the support plate 107 of the first embodiment, and functions as a kind of heat sink. That is, the heat generated by each LED element 210 is quickly conducted to the support block 107A through the substrate 205.

  Moreover, as shown in FIG.5 (b), 1 A of light irradiation apparatuses of this embodiment are provided with the two heat pipes 440 and 460 arrange | positioned in piles. The heat pipes 440 and 460 differ only in shape from the heat pipe 410 of the first embodiment, and have the same configuration and function.

  The heat pipe 440 is a plate-like member disposed along the inner surface on the back side of the case 100. One end of the heat pipe 440 (the lower side in FIGS. 5A and 5B) is joined to the support member 109 and the support block 107A, as shown by the dotted arrows in FIG. 5B. The heat conducted from these is transported to the other end side (the upper side in FIGS. 5A and 5B). On the other end side (the upper side in FIGS. 5A and 5B) of the heat pipe 440, the heat sink 450 is placed on one surface of the heat pipe 440 (the surface joined to the support member 109 and the support block 107A). A plurality of heat dissipating fins 450a are brazed. Each radiating fin 450a is erected so as to protrude in the Y-axis direction from one surface of the heat pipe 440 in the same manner as the radiating fin 430a of the first embodiment, and radiates heat transmitted to the heat pipe 440 into the air. .

  The heat pipe 460 is a member provided with a flat portion 460a and a bent portion 460b. The flat surface portion 460a is a flat plate-like portion extending in the Z-axis direction from the upper surface (the surface on the centrifugal fans 501 and 502 side) of the support block 107A toward the radiating fin 450a, and is in close contact with and joined to one surface of the heat pipe 440. Has been. The bent portion 460b is a portion that is bent along the upper surface and the front surface of the support block 107A (the surface opposite to the surface that is bonded to the heat pipe 440), and is bonded to the support member 109 and the support block 107A. Then, as shown by the dotted arrows in FIG. 5B, the heat conducted from these is transported to the plane portion 460a. A plurality of radiating fins 470a constituting the heat sink 470 are brazed to the flat surface portion 460a of the heat pipe 460 on one surface of the heat pipe 460 (the surface opposite to the surface joined to the heat pipe 440). Each radiating fin 470a is erected so as to protrude in the Y-axis direction from one surface of the heat pipe 460, similarly to the radiating fin 450a, and radiates heat transmitted to the heat pipe 460 into the air.

  Thus, in the present embodiment, the support member 109 and the support block 107A are sandwiched between the one end portion of the heat pipe 440 and the bent portion 460b of the heat pipe 460, and the heat of the support member 109 and the support block 107A is transferred to the two heat pipes 440. By efficiently transporting by 460, the temperature rise of the support member 109 and the support block 107A is suppressed. That is, the heat generated in each LED element 210 and transferred to the support block 107A through the substrate 205 is efficiently transported by the two heat pipes 440 and 460. Further, as described above, each mirror surface 108a, 108b, 108c, 108d and the window portion 105 generate heat by ultraviolet light, and these heats are efficiently transported by the two heat pipes 440, 460 through the support member 109. Is done. The heat transported by the two heat pipes 440 and 460 is efficiently radiated into the air from the heat radiation fins 450a and the heat radiation fins 470a.

  Thus, also in the present embodiment, as in the first embodiment, the case 100 and the heat pipes 440 and 460 constitute a kind of wind tunnel, and by limiting the space through which the airflow flows, each radiating fin 450a, 470a is efficiently cooled. In the present embodiment, the two heat pipes 440 and 460 are overlapped. However, the length of the flat surface portion 460a of the heat pipe 460 is longer than the length of the heat pipe 440 in the Z-axis direction. By shortening, the area | region where the radiation fin 450a is formed on the heat pipe 440 is ensured, and the area | region where the radiation fin 470a is formed on the heat pipe 460 is ensured. As in the first embodiment, the centrifugal fans 501 and 502 efficiently cool the heat radiating fins 450a and 470a, and the light irradiation device 1A is also made thinner.

(Third embodiment)
FIG. 6 is a diagram illustrating the internal configuration of the light irradiation apparatus 1B according to the third embodiment of the present invention, and FIG. 6A is a front perspective view of the light irradiation apparatus 1B as viewed from the front. . FIG. 6B is a side perspective view of the light irradiation device 1B as viewed from the right side. In FIG. 6 (b), the internal wiring cable 106 of FIG. 6 (a) is omitted for easy understanding of the drawing.

  As shown in FIG. 6, the light irradiation device 1B of the present embodiment includes the LED driving circuit 600 in the space between the centrifugal fans 501 and 502 and the radiation fins 470a, and thus the light of the second embodiment. Different from the irradiation apparatus 1A.

  The LED drive circuit 600 is a circuit that is electrically connected to the internal wiring cable 106 and the substrate 205 and controls the drive current supplied to each LED element 210. As shown in FIG. 6, the LED drive circuit 600 of this embodiment is disposed in a space between the centrifugal fans 501 and 502 and the heat radiating fins 470a. Therefore, the LED drive circuit 600 is efficiently cooled by the air flowing from the centrifugal fans 501 and 502 toward the heat radiation fins 470a.

(Fourth embodiment)
FIG. 7 is a diagram illustrating an internal configuration of a light irradiation apparatus 1C according to the fourth embodiment of the present invention, and FIG. 7A is a front perspective view of the light irradiation apparatus 1C as viewed from the front. . Moreover, FIG.7 (b) is AA sectional drawing of Fig.7 (a).

  As shown in FIG. 7, the light irradiation apparatus 1C of the present embodiment is different from the light irradiation apparatus 1 of the first embodiment in that a counterclockwise centrifugal fan 501C is provided.

  The centrifugal fan 501C is a sirocco centrifugal fan having the same configuration as that of the centrifugal fan 502 except that the rotational direction is different. The centrifugal fans 501C and 502 extrude air taken from outside in the centrifugal direction (that is, the rotational direction). Thus, an air flow is generated in the case 100. In the centrifugal fans 501C and 502 having such a configuration, there is a problem that the wind direction and the air volume are different in the left-right direction of the exhaust ports 501Cb and 502b (that is, the X-axis direction). Therefore, in the present embodiment, the centrifugal fan 501C and the centrifugal fan 502 having different rotational directions are used so that air is sent substantially evenly in the left-right direction of the heat pipe 410. Specifically, when viewed from the front (FIG. 7A), the centrifugal fan 501C that rotates counterclockwise is disposed on the left side with respect to the center line C of the heat pipe 410, and the air from the centrifugal fan 501A is center line. It is configured so as to be fed into each of the heat dissipating fins 430a located on the left side of C. Further, the centrifugal fan 502 is arranged on the right side with respect to the center line C of the heat pipe 410 so that the air from the centrifugal fan 502 is sent to each radiating fin 430a located on the right side of the center line C. . According to such a configuration, since air is fed symmetrically to the heat dissipating fins 430a located on the left and right sides of the center line C of the heat pipe 410, it is possible to cool the left and right evenly.

(Fifth embodiment)
FIG. 8 is an external view of a light irradiation apparatus 1D according to the fifth embodiment of the present invention, and FIG. 8A is a top view of the light irradiation apparatus 1D. Moreover, FIG.8 (b) is a front view of light irradiation apparatus 1D, and FIG.8 (c) is a bottom view of light irradiation apparatus 1D. FIG. 8D is a right side view of the light irradiation apparatus 1D, and FIG. 8E is a left side view of the light irradiation apparatus 1D. FIG. 9 is a diagram illustrating the internal configuration of the light irradiation device 1D, and is a front perspective view of the light irradiation device 1D when viewed from the front.

  As shown in FIGS. 8 and 9, the light irradiation device 1 </ b> D of this embodiment includes turbo centrifugal fans 501 </ b> D and 502 </ b> D, and the air inlet 101 </ b> D of the turbo centrifugal fan 501 </ b> D is formed on the left side surface of the case 100. (FIG. 8 (e)), the air inlet 102D of the turbo centrifugal fan 502D is formed on the right side surface of the case 100 (FIG. 8 (d)), and is different from the light irradiation apparatus 1C of the fourth embodiment. .

  The turbo centrifugal fans 501D and 502D are so-called cross-flow fans, which take in external air from the intake ports 101D and 102D, respectively, and send them to the radiating fins 430a. In the present embodiment, as in the fourth embodiment, the turbo centrifugal fan 501D located on the left side of the front view (FIG. 9) rotates counterclockwise, and the turbo located on the right side of the front view (FIG. 9). The mold centrifugal fan 502D is configured to rotate clockwise, so that more heat radiation fins 430a disposed near the center line C of the heat pipe 410 can be fed into and efficiently cooled. .

  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.

1, 1A, 1B, 1C, 1D Light irradiation device 100 Case 101, 102 Inlet port 103 Outlet port 104 Connector 105 Window portion 106 Internal wiring cable 107 Support plate 107A Support block 108 Reflective member 109 Support member 110 Cable 200 Light source unit 205 Substrate 210 LED element 400 Heat radiation member 410, 410A, 440, 460 Heat pipe 410a Plane portion 410b Bending portion 412 Bar-shaped heat pipe 430 Heat sink 430a Radiation fins 501, 502, 501C Centrifugal fans 501D, 502D Turbo centrifugal fans 501a, 502a Inlet 501b 502b Exhaust port 600 LED drive circuit

Claims (16)

A light irradiation device for irradiating a line-shaped light extending in a first direction on an irradiation surface,
An elongated substrate extending in the first direction;
A plurality of LED (Light Emitting Diode) light sources arranged on the surface of the substrate at predetermined intervals along the first direction and emitting the line-shaped light,
Heat transport means that at least partly contacts the substrate, extends from the substrate in a second direction orthogonal to the first direction, and transports heat generated by the LED light source in the second direction;
A heat dissipating means having a plurality of heat dissipating fins protruding from the heat transporting means in a third direction orthogonal to the first direction and the second direction, and extending in the second direction;
A reflective member that is located closer to the irradiation surface than the LED light source and reflects light emitted from the LED light source;
A support member that is thermally coupled to the reflective member and supports the reflective member;
With
The light irradiation apparatus, wherein the support member is thermally coupled to the heat transporting means.   A thin box-shaped housing is provided in the third direction, which accommodates the substrate, the heat transport means, and the heat dissipation means, and forms a wind tunnel in a region where the heat dissipation means is formed. The light irradiation apparatus according to claim 1. In the second direction, the centrifugal fan is disposed between the substrate and the heat radiating means, guides air from the outside to the wind tunnel, and generates an air flow in the second direction in the wind tunnel. The light irradiation apparatus according to claim 2. The housing has an intake port for taking in air from the outside, on at least one of one surface facing a virtual surface formed by tips of the plurality of radiating fins or two surfaces facing the first direction,
The light irradiation apparatus according to claim 3, wherein the centrifugal fan takes in air from the intake port.   5. The light irradiation apparatus according to claim 1, wherein a width of the heat transport unit in the first direction is substantially equal to a width of the substrate in the first direction. 6. The base end of the heat transport means is bent in an L shape,
The light irradiation apparatus according to claim 1, wherein the base end portion is thermally coupled to the back surface of the substrate. The light irradiation device further includes a support block that is thermally coupled to the back surface of the substrate and supports the substrate;
The heat transport means comprises a first heat transport means and a second heat transport means smaller than the first heat transport means in the second direction,
The heat dissipating means comprises a first heat sink having the heat dissipating fins on the first heat transporting means, and a second heat sink having the heat dissipating fins on the second heat transporting means,
The said support block is provided so that it may be pinched | interposed by the base end part of the said 1st heat-transport means, and the base end part of the said 2nd heat-transport means. The light irradiation apparatus as described in any one.   The drive circuit which drives the said LED light source is provided between the said centrifugal fan and the said thermal radiation means, The claim of Claim 3, Claim 4 or Claim 3 characterized by the above-mentioned. The light irradiation apparatus as described in any one.   The light irradiation according to any one of claims 1 to 8, wherein the heat transporting means is formed of a plate-like heat pipe extending in the first direction and the second direction. apparatus.   9. The heat transfer means is formed by arranging a plurality of rod-shaped heat pipes extending in the second direction in the first direction. 10. Light irradiation device.   The said board | substrate is arrange | positioned on the plane specified by the said 1st direction and the said 3rd direction, The optical axis of each said LED light source has faced the direction contrary to the said 2nd direction. The light irradiation apparatus as described in any one of Claims 1-10.   The light irradiation apparatus according to claim 11, wherein the LED light sources are arranged in N rows (N is an integer of 2 or more) along the third direction when the substrate is viewed in plan. .   The said board | substrate is arrange | positioned on the plane specified by the said 1st direction and the said 2nd direction, and the optical axis of each said LED light source has faced the said 3rd direction. The light irradiation apparatus according to any one of 10.   The light irradiation apparatus according to claim 13, wherein the LED light sources are arranged in N rows (N is an integer of 2 or more) along the second direction when the substrate is viewed in plan. . The centrifugal fan comprises a first centrifugal fan having a fan that rotates counterclockwise, and a second centrifugal fan having a fan that rotates clockwise,
The said 1st centrifugal fan and the said 2nd centrifugal fan are arranged side by side in the said 1st direction, The claim of Claim 3, Claim 4, or Claim 5 to Claim 14 characterized by the above-mentioned. The light irradiation apparatus as described in any one of these.   The light irradiation apparatus according to any one of claims 1 to 15, wherein the light is light including a wavelength that acts on the ultraviolet curable resin.

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