JP2015198139A - light irradiation unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation unit which has a high integration degree of LEDs and connectable in a line direction and a direction perpendicular to the line direction.SOLUTION: A light irradiation unit which extend in a first direction on an irradiation face, and irradiate linear light having a predetermined line width in a second direction perpendicular to the first direction comprises a substrate, N light sources arranged on the substrate to be spaced from one another at a predetermined interval along the first direction, N lens arranged on optical paths of the respective light sources, a lens support portion which comes into contact with the periphery of the edge portion at the first face side of each lens and supports each lens on a predetermined flat face defined by a first direction and a second direction, at least a pair of plate-shaped lens press portions arranged to confront each other and pinch the N lens from the second direction, and plural tongue piece portions which project from the tip portions of the lens press portions onto the second face of each lens, elastically press the periphery of the edge portion of the second face side to urge each lens against the lens support portion, and position each lens in the first direction and the second direction.

Description

  The present invention relates to a light irradiation unit in which a plurality of LEDs (Light Emitting Diodes) are arranged in a line shape and irradiates a line-shaped light.

  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. Therefore, in place of the conventional discharge lamp, an ultraviolet light irradiation device using an LED (Light Emitting Diode) as a light source has been developed. Such an ultraviolet light irradiation apparatus is described in Patent Documents 1 and 2, for example.

  The ultraviolet light irradiation device (line irradiation type ultraviolet irradiation device) described in Patent Document 1 includes a plurality of UV-LEDs arranged linearly at predetermined intervals, and irradiation arranged in the optical path of each UV-LED. A slit and a diffusion plate that diffuses ultraviolet rays that have passed through the irradiation slit in a line shape are provided. Then, the diffuser diffuses the ultraviolet rays emitted from the respective UV-LEDs into an ellipse having the major axis in the arrangement direction of the UV-LEDs, thereby obtaining line light having a substantially flat irradiation intensity.

  The ultraviolet light irradiation device (irradiation module) described in Patent Literature 2 includes a plurality of main body units each having an LED and a cylindrical lens disposed in the optical path of the LED. Each main unit is configured to condense the ultraviolet light emitted from the LED into a line shape by a cylindrical lens, and is long from the ultraviolet light irradiation device by arranging a plurality of main units in a line at a predetermined interval. Line-shaped illumination light is emitted.

  In addition, in order to increase the irradiation intensity, a light irradiation device is also proposed in which LEDs are arranged in a plurality of rows in a direction orthogonal to the line direction, and a plurality of line-shaped irradiation lights emitted from the LEDs arranged in the plurality of rows are superimposed. (For example, Patent Document 3).

Utility Model Registration No. 3151132 JP 2013-210422 A JP 2003-202294 A

  According to the ultraviolet light irradiation apparatus described in Patent Literatures 1, 2, and 3, linear illumination light having a length corresponding to the number of LEDs arranged in a straight line is obtained. However, various sizes of paper are used in offset sheet-fed printing, and there are various sizes of FPDs. Therefore, the length of illumination light required varies, and according to the required specifications. There is a problem in that the number of LEDs must be changed and an optimum design must be redesigned each time. For this reason, in applications such as offset sheet-fed printing and FPD, there is a need for a light irradiation unit that can be appropriately connected (that is, expanded) in the line direction according to required specifications.

  In addition, in the application of offset sheet-fed printing or FPD, the required peak irradiation intensity of ultraviolet light differs depending on the ultraviolet curable ink or ultraviolet curable resin used. For this reason, there is a demand for changing the number of LEDs in accordance with the ultraviolet curable ink and the ultraviolet curable resin (that is, specifications) used.

  In order to increase the peak irradiation intensity, it is effective to arrange the LEDs as close as possible (that is, increase the degree of integration), but generally, as in the configurations described in Patent Documents 1, 2, and 3, An optical element such as a diffusion plate or a cylindrical lens is disposed in the optical path of the LED, and a fixing member (for example, a lens barrel or a lens presser) for fixing these components is also required. There is a problem that it is restricted by the size of the fixing member.

  In order to increase the peak irradiation intensity, it is also effective to arrange LEDs in a plurality of rows in a direction orthogonal to the line direction as in the configuration of Patent Document 3, but this is the case. However, since the number of LED columns required (ie, the number of LEDs) differs depending on the UV curable ink or UV curable resin used, it is connected in the direction perpendicular to the line direction as appropriate according to the required specifications. There is a need for a light irradiation unit that can be expanded (that is, expanded).

  This invention is made | formed in view of said situation, and is providing the light irradiation unit with which the integration degree of LED is high and can be connected in the direction orthogonal to a line direction and a line direction.

  In order to achieve the above object, the light irradiation unit of the present invention emits line-shaped light having a predetermined line width in a second direction that extends in the first direction and is orthogonal to the first direction on the irradiation surface. A light irradiating unit for irradiating, wherein the direction of the optical axis is aligned with a substrate and a third direction orthogonal to the first direction and the second direction, and arranged on the substrate at predetermined intervals along the first direction. N (N is an integer of 2 or more) light sources, N lenses arranged on the optical path of each light source, and the periphery of the edge on the first surface side of each lens, A lens support portion that supports a predetermined plane defined by one direction and a second direction, and at least a pair of plate-like lens pressing portions that are arranged to face each other so as to sandwich N lenses from the second direction. And projecting from the tip of the lens pressing portion onto the second surface of each lens, and elastically around the edge on the second surface side Pressed, the biasing each lens in the lens support portion, and a plurality of tongue portions for positioning the lenses in the first direction and the second direction.

  According to such a configuration, the size of the lens fixing member can be reduced, and the light irradiation unit can be arbitrarily connected in the first direction and the second direction. Further, the light sources can be closely connected, and as a result, the integration degree of the light sources can be increased.

  The plurality of tongue pieces may be provided so as to press four points that are point-symmetrical with respect to the optical axis of each lens when viewed from the third direction. With this configuration, the lens can be stably fixed and positioned.

  Moreover, each tongue piece part may protrude in a rectangular shape when viewed from the third direction, and one corner of the tip of each tongue piece part may press the second surface of each lens.

  In addition, each tongue piece portion is disposed so as to protrude in a rectangular shape when viewed from the third direction and straddle between two lenses adjacent to each other in the first direction. May press one of the two lenses, and the other corner of the tip of each tongue piece may press the other of the two lenses.

  Further, the lens pressing portion may have a cutout portion extending along the third direction between the tongue pieces.

  A convex surface having a positive refractive power in at least the second direction may be formed on the second surface side of each lens. Specifically, the second surface of each lens may be a cylindrical surface, a toroidal surface, or a spherical surface.

  Each lens may have a circular shape when viewed from the third direction. Alternatively, each lens may have a rectangular shape when viewed from the third direction, or may be connected along the first direction.

  Further, the lens pressing portion is connected to the lens support portion so as to be movable along the third direction, and when fixed to the lens support portion, the distance between the predetermined plane and each tongue piece portion is reduced. It may be one that moves to.

  The first surface of each lens may be a concave surface, a convex surface, or a flat surface. The light source may be composed of at least one or more LED elements. Further, the light may be light including a wavelength that acts on the ultraviolet curable resin.

  As described above, according to the present invention, a light irradiation unit that has a high degree of integration of LEDs and can be connected in a line direction and a direction orthogonal to the line direction is realized.

1A is a plan view, FIG. 1B is a side view, and FIG. 1C is a front view of a UV irradiation unit according to an embodiment of the present invention. 2A is a plan view, FIG. 2B is a cross-sectional view, and FIG. 2C is a front view of an LED unit according to an embodiment of the present invention. 3A is a plan view, FIG. 3B is a side view, and FIG. 3C is a front view of the lens unit according to the embodiment of the present invention. FIGS. 4A and 4B are a plan view and a side view of a state where the toroidal lens and the toroidal lens pressing portion are removed from the lens unit according to the embodiment of the present invention. FIG. 5 is a diagram illustrating the configuration of the toroidal lens pressing portion of the lens unit according to the embodiment of the present invention. FIG. 6 is a plan view of a UV irradiation apparatus using the UV irradiation unit of the present embodiment. FIG. 7 is an enlarged perspective view of a toroidal lens pressing portion according to a modification of the present 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.

  FIG. 1 is a diagram illustrating a configuration of a UV irradiation unit 1 according to an embodiment of the present invention, and FIG. 1A is a plan view of the UV irradiation unit 1 according to an embodiment of the present invention. FIG. 1B is a side view of the UV irradiation unit 1 shown in FIG. 1A viewed from the Y-axis direction, and FIG. 1C shows the UV irradiation unit 1 shown in FIG. It is the front view seen from the axial direction. The UV irradiation unit 1 according to the present embodiment is mounted on a light source device that cures an ultraviolet curable ink used as an ink for offset sheet-fed printing or an ultraviolet curable resin used as an adhesive in an FPD (Flat Panel Display) or the like. The device is arranged above the irradiation object and emits linear ultraviolet light to the irradiation object. In this specification, as shown by the coordinates in FIG. 1A, the arrangement direction of LED (Light Emitting Diode) elements 20 to be described later is the Y-axis direction, and the direction in which the LED elements 20 emit ultraviolet light is Z. An axial direction and a direction perpendicular to the Y-axis direction and the Z-axis direction are defined as the X-axis direction.

  As shown in FIGS. 1A to 1C, the UV irradiation unit 1 of this embodiment includes an LED unit 100 in which a plurality of LED elements 20 (FIG. 2) are arranged, a plurality of spherical lenses 30 and a toroidal lens. 40 includes a lens unit 200 disposed on the optical path of the LED unit 100.

  FIG. 2 is a diagram illustrating the configuration of the LED unit 100. FIG. 2A is a plan view of the LED unit 100. 2B is a cross-sectional view of the LED unit 100 of FIG. 2A cut along the line AA, and FIG. 2C is a cross-sectional view of the LED unit 100 of FIG. It is the front view seen from the direction. As shown in FIGS. 2A to 2C, the LED unit 100 includes an LED support portion 10, ten LED substrates 15, and a plurality of LED elements 20 arranged on each LED substrate 15. ing. In each LED board 15 of the present embodiment, four LED elements 20 are arranged at predetermined intervals in a line in the Y-axis direction with the optical axes aligned in the Z-axis direction. 15 is electrically connected. The LED board 15 is connected to an LED drive circuit (not shown), and each LED element 20 is supplied with a drive current from the LED drive circuit via the LED board 15. When a driving current is supplied to each LED element 20, each LED element 20 emits ultraviolet light having a light amount corresponding to the driving current, and a linear ultraviolet light parallel to the Y-axis direction is emitted from LED unit 100. Is done. In addition, each LED element 20 of this embodiment is adjusted in the drive current supplied to each LED element 20 so that the substantially uniform light quantity of ultraviolet light is emitted, and is linearly emitted from the LED unit 100. The ultraviolet light has a substantially uniform light amount distribution in the Y-axis direction. In addition, each LED element 20 of this embodiment is provided with the substantially square light emission surface, receives the supply of a drive current from an LED drive circuit, and radiates | emits the ultraviolet light with a wavelength of 365 nm.

  FIG. 3 is a diagram illustrating the configuration of the lens unit 200. FIG. 3A is a plan view of the lens unit 200. 3B is a side view of the lens unit 200 shown in FIG. 3A viewed from the Y-axis direction, and FIG. 3C shows the lens unit 200 shown in FIG. 3A in the X-axis direction. It is the front view seen from. The lens unit 200 is a member that molds ultraviolet light emitted from the LED element 20 into a single line-shaped ultraviolet light extending in the Y-axis direction and having a predetermined line width in the X-axis direction. ) To (c), a spherical lens 30, a lens housing portion 31, a lens pressing frame 32 (FIG. 4), a toroidal lens 40, a toroidal lens pressing portion 41, a fixing screw 45 and a mounting screw 50 are provided. The length of the lens unit 200 in the X axis direction and the Y axis direction is substantially equal to the length of the LED unit 100 in the X axis direction and the Y axis direction.

  First, the spherical lens 30 and the fixing mechanism of the spherical lens 30 will be described with reference to FIG. 4A is a plan view in which the toroidal lens 40 and the toroidal lens pressing portion 41 are removed from the lens unit 200, and FIG. 4B is a view of the lens unit 200 of FIG. 4A viewed from the Y-axis direction. FIG.

  As shown in FIGS. 4A and 4B, the spherical lens 30 is a circular plano-convex lens having a flat first surface 30a and a spherical second surface 30b. The lens unit 200 includes the same number (that is, ten) of spherical lenses 30 as the LED substrates 15, and each spherical lens 30 has the same shape and optical characteristics, and the light of the corresponding LED element 20. Located on the road.

  The ultraviolet light emitted from the LED element 20 is incident on the first surface 30a of the spherical lens 30 and is emitted from the second surface 30b. Thus, when the ultraviolet light emitted from the LED element 20 passes through the spherical lens 30, it is shaped into ultraviolet light having a predetermined divergence angle.

  The spherical lens 30 is housed in the lens housing portion 31. The lengths of the lens housing portion 31 in the X-axis direction and the Y-axis direction are substantially the same as the lengths of the LED support portion 10 in the X-axis direction and the Y-axis direction. The lens housing portion 31 includes a spherical lens support portion 310 that supports the first surface 30a of the spherical lens 30, a pair of toroidal lens support portions 320 that protrude from the spherical lens support portion 310 in the Z-axis direction, and a lens housing. A fixing portion 330 for fixing the portion 31 to the LED support portion 10. The spherical lens support portion 310 has an opening (not shown) at a position facing the LED element 20. The spherical lens 30 is disposed at a position where an opening is formed, and is fixed to the lens housing 31 by being urged in the Z-axis direction by a lens pressing frame 32. The pair of toroidal lens support portions 320 are thin plates extending in the YZ axis direction, and are formed to face each other in the X axis direction with the spherical lens 30 interposed therebetween. A flat surface portion P is formed at the tip of the toroidal lens lens support portion 320. The lens housing portion 31 is connected to the LED support portion 10 by fixing the fixing portion 330 to the LED support portion 10 of the LED unit 100 with the mounting screw 50.

  Subsequently, returning to FIG. 3, the toroidal lens 40 and the fixing member of the toroidal lens 40 will be described. In the present embodiment, a five-unit molded toroidal lens in which five toroidal lenses 40 are coupled along the Y-axis direction is used. The toroidal lens 40 is a plano-convex lens having a planar first surface 40a and a toroidal second surface 40b having a rectangular shape in plan view. In the lens unit 200 of the present embodiment, two toroidal lenses 40 are arranged side by side in the Y-axis direction. That is, the lens unit 200 includes ten toroidal lenses 40.

  The toroidal lens 40 is a lens having different refractive powers in the Y-axis direction and the X-axis direction. Therefore, the ultraviolet light emitted from the LED element 20 and transmitted through the spherical lens 30 is incident on the first surface 40a of the toroidal lens 40, and is condensed in the X-axis direction and the Y-axis direction, respectively, from the second surface 40b. Emitted. The ultraviolet light emitted from each toroidal lens 40 overlaps with the ultraviolet light emitted from the adjacent toroidal lens 40 in the Y-axis direction, and extends from the UV irradiation unit 1 in the Y-axis direction and is predetermined in the X-axis direction. A line-shaped ultraviolet light having a line width of 1 is emitted.

  As shown in FIG. 3B, the toroidal lens 40 of the present embodiment is first disposed on a pair of toroidal lens support portions 320 formed in the lens housing portion 31. Specifically, the toroidal lens 40 is disposed on a flat surface portion P formed at the tip of the toroidal lens support portion 320. Then, in a state where the toroidal lens 40 is disposed on the flat surface portion P, the end of the toroidal lens support portion 320 and the end of the toroidal lens 40 in the Y-axis direction coincide with each other. Positioning in the Y-axis direction is performed. In the present embodiment, the distance in the X-axis direction between the pair of toroidal lens support portions 320 (the distance from the outer surface of one toroidal lens support portion 320 to the outer surface of the other toroidal lens support portion 320) is The toroidal lens 40 is configured to have substantially the same size in the X-axis direction. In this state, the periphery of the edge of the first surface 40a of the toroidal lens 40 in the X-axis direction is supported by the toroidal lens support 320. It is supported on a plane defined by the Y axis and the X axis (that is, plane P).

  Subsequently, the pair of toroidal lens pressing portions 41 are fixed so as to sandwich both sides of the toroidal lens 40 in the X-axis direction. The toroidal lens pressing portion 41 is a member that is formed of a thin metal plate and extends in the YZ axis direction. As shown in FIG. 3C, a positioning notch 43 is formed at a predetermined position of the toroidal lens pressing portion 41. A positioning pin 33 is provided at a predetermined position of the lens housing portion 31. Then, the toroidal lens pressing portion 41 is positioned in the Y-axis direction by arranging the notch 43 of the toroidal lens pressing portion 41 so as to fit the positioning pin 33 of the lens housing portion 31. Further, a notch 44 for avoiding the mounting screw 50 is formed at a predetermined position of the toroidal lens pressing portion 41. Accordingly, the toroidal lens pressing portion 41 is attached in close contact with the toroidal lens support portion 320 in the X-axis direction.

  FIG. 5 is a diagram illustrating a configuration of the toroidal lens pressing portion 41, and FIG. 5A is a perspective view in which a part of the toroidal lens pressing portion 41 is enlarged. 5B is a partially enlarged view of FIG. 3A, and FIG. 5C is a cross-sectional view of the toroidal lens pressing portion 41 when viewed from the Y-axis direction. As shown in FIGS. 5A to 5C, a plurality of tongue pieces 410 projecting in the X-axis direction are formed at the tip of the toroidal lens pressing portion 41 in the Z-axis direction. The tongue piece 410 has a substantially rectangular shape with the long side in the Y-axis direction, and is formed at a predetermined interval in the Y-axis direction. Specifically, as illustrated in FIG. 5B, the tongue piece 410 extends between the two toroidal lenses 40 adjacent in the Y-axis direction on the second surface 40 b of the toroidal lens 40. Placed in. In addition, the tongue piece part 410 in the both ends of a Y-axis direction is arrange | positioned at the edge part of the toroidal lens 40 of both ends (FIG. 3 (a)). Further, as shown in FIGS. 3C and 5, notches 420 are formed between the plurality of tongue pieces 410 of the toroidal lens pressing portion 41.

  The toroidal lens pressing portion 41 is fixed to the lens housing portion 31 from the X-axis direction by a fixing screw 45 made of a countersunk screw. As shown in FIG. 5C, when the fixing screw 45 is not tightened, the tip of the tongue piece 410 is in contact with the second surface 40b of the toroidal lens 40, but the toroidal lens pressing portion 41 is Z. The toroidal lens retainer 41 is movable in the Z-axis direction by a space between the fixing screw 45 and the screw hole 430 formed in the toroidal lens retainer 41. It has become. When the fixing screw 45 is tightened from this state, the screw hole 430 and the plate portion of the fixing screw 45 come into contact with each other. When the fixing screw 45 is further tightened, the screw hole 430 (that is, the toroidal lens pressing portion 41) is pushed down to the negative side in the Z-axis direction by the 45 portion of the fixing screw. As a result, the toroidal lens pressing portion 41 moves toward the lens housing portion 31, and between each tongue piece portion 410 and the plane portion P of the lens support portion 320 on which the first surface 40a of the toroidal lens 40 is supported. The distance is shortened (that is, the toroidal lens 40 is urged to the flat surface portion P of the lens support portion 320).

  In this manner, the tongue piece 410 presses the periphery of the edge on both sides in the X-axis direction of the second surface 40b of the toroidal lens 40. More specifically, one corner (corner A1 shown in FIG. 5) of each tongue piece 410 presses one of the two toroidal lenses 40 adjacent in the Y-axis direction, and the other corner (corner shown in FIG. 5). A2) presses the other of the two adjacent toroidal lenses 40. Thereby, as shown in FIG.5 (b), four points in the 2nd surface 40b of each toroidal lens 40 are pressed by the corner | angular of the front-end | tip of the several tongue piece part 410 which opposes in an X-axis direction. . That is, in the present embodiment, each tongue piece portion 410 is disposed so as to press four points that are in point symmetry positions with the optical axis AX of each lens as the center in plan view. Thereby, the toroidal lens 40 is urged by the toroidal lens support 320, and the toroidal lens 40 is positioned in the X-axis direction, the Y-axis direction, and the Z-axis direction. In the present embodiment, when each tongue piece 410 presses the toroidal lens 40, a notch 420 is formed between each tongue piece 410 in order to prevent deformation and breakage of the lens. The portion 410 is configured to have elasticity in the X-axis direction. As another embodiment, the tongue piece 410 may be formed of resin or rubber.

  As described above, in the UV irradiation unit 1 of the present embodiment, the toroidal lens 40 is sandwiched in the X-axis direction and pressed in the Z-axis direction by the tongue piece portion 410 of the toroidal lens pressing portion 41 formed of a thin plate. The toroidal lens 40 is positioned and fixed. Therefore, it is not necessary to provide a fixing member (fixing frame or fixing part for screwing) for fixing the toroidal lens 40 at the end of the UV irradiation unit 1 in the Y-axis direction. Axial size is minimized. That is, the end in the Y-axis direction of the UV irradiation unit 1 of the present embodiment is equal to the end in the Y-axis direction of the toroidal lens support 320 and the end in the Y-axis direction of the toroidal lens 40, and a plurality of UV irradiation units. 1 can be connected along the Y-axis direction. Further, since the size of the UV irradiation unit 1 in the X-axis direction is also kept small, a plurality of UV irradiation units 1 can be connected along the X-axis direction.

  FIG. 6 is a plan view showing an example of a UV irradiation apparatus 1000 in which the UV irradiation unit 1 of the present embodiment is arranged in the X-axis direction and the Y-axis direction. As shown in FIG. 6, the UV irradiation apparatus 1000 is configured such that the UV irradiation units 1 are connected and arranged on a heat sink (not shown) in the form of three (Y-axis direction) × 3 rows (X-axis direction). It is. As shown in FIG. 6, since the UV irradiation unit 1 of this embodiment has no member protruding in the Y-axis direction, a plurality of UV irradiation units 1 can be arranged without gaps in the Y-axis direction. In addition, since the size of the UV irradiation unit 1 of the present embodiment is also small in the X-axis direction, a plurality of UV irradiation units 1 are closely arranged in the X-axis direction as in the UV irradiation apparatus 1000. be able to. As described above, a plurality of the UV irradiation units 1 of the present embodiment can be connected side by side in the X-axis direction and the Y-axis direction. By changing, it is possible to configure UV irradiation apparatuses having various irradiation intensities, irradiation areas, and irradiation line lengths.

  The above is the description of an example of the embodiment of the present invention. However, the present invention is not limited to the configuration of the above embodiment, and is within the scope of the technical idea expressed by the description of the scope of claims. Various modifications are possible. For example, the above embodiment is an example in which the present invention is applied to an apparatus that generates ultraviolet irradiation light, but generates irradiation light in other wavelength ranges (eg, visible light such as white light, infrared light, etc.). The present invention can also be applied to an irradiation apparatus.

  Moreover, in the said embodiment, although the 1st surface of the spherical lens 30 and the toroidal lens 40 was made into the plane, it is not limited to this, A concave surface or a convex surface may be sufficient. Further, the toroidal lens 40 is not limited to a five-unit molded toroidal lens, and ten toroidal lenses having a circular shape in plan view that are individually molded may be used. In this case, they are fixed while positioning one by one. In addition to the toroidal lens 40, a cylindrical lens or a spherical lens may be used, and the second surface 40b may be a concave surface. Also in this case, four points that are point-symmetrical with respect to the optical axis of each lens are pressed by the toroidal lens pressing portion 41.

  Further, the shape of the tongue piece 410 in the toroidal lens pressing portion 41 is not limited to the above embodiment, and it is possible to press four points that are point-symmetrical about the optical axis of each toroidal lens 40. Various modifications are possible. FIGS. 7A to 7D are perspective views showing a toroidal lens pressing portion according to a modification. For convenience of explanation, in FIGS. 7A to 7D, only the configuration around two (or four) tongue pieces that press four points along the Y-axis direction is shown in an enlarged manner. Yes. As shown in FIG. 7A, the toroidal lens pressing portion 41a in the first modified example is different from the toroidal lens pressing portion 41 of the above embodiment in that the notch portion 420 is not formed between the tongue pieces 410a. Is different. The shape of the tongue piece 410a of this modification is the same as that of the tongue piece 410 in the above embodiment. Also in this modification, four points that are point-symmetrical about the optical axis of each toroidal lens 40 are pressed by one corner of the tip of each tongue piece 410a. As a result, the toroidal lens 40 is fixed and positioned in the X-axis direction, the Y-axis direction, and the Z-axis direction.

  Further, as shown in FIG. 7 (b), the toroidal lens pressing portion 41b in the second modified example is such that the notch portion 420 is not formed between the tongue pieces 410b, and the shape of the tongue piece 410b is triangular. The toroidal lens retainer according to the above-mentioned embodiment in that it is shaped and does not straddle between two adjacent toroidal lenses 40 and is arranged so as to press each toroidal lens 40 at two points along the Y-axis direction. Different from the part 41. Also in this modified example, the four points at the point-symmetrical positions about the optical axis of each toroidal lens 40 are pressed by the corners of the tips of the four triangular tongue pieces 410b. As a result, the toroidal lens 40 is fixed and positioned in the X-axis direction, the Y-axis direction, and the Z-axis direction.

  Further, as shown in FIG. 7C, the toroidal lens pressing portion 41c in the third modified example is provided with a tongue piece portion 410c that is divided into two in the Y-axis direction. Different from the presser part 41. Also in this modified example, the four points at the point-symmetrical positions about the optical axis of each toroidal lens 40 are pressed by the corners of the tips of the four tongue pieces 410c.

  Further, as shown in FIG. 7 (d), the toroidal lens pressing portion 41d in the fourth modified example has a tongue piece portion 410d obtained by dividing the tongue piece portion 410a shown in FIG. 7 (a) into two in the Y-axis direction. Is different from the toroidal lens pressing portion 41a of the first modified example. Also in this modification, the four points at the point-symmetrical positions about the optical axis of each toroidal lens 40 are pressed by the corners of the tips of the four tongue pieces 410d. Further, the tongue piece 410 can be not only a thin plate shape but also a rod shape (round, square) or a sphere (hemisphere).

  In the above embodiment, the two toroidal lens pressing portions 41 extending in the Y-axis direction are arranged to face each other in the X-axis direction. However, the present invention is not limited to this and is divided into a plurality of parts in the Y-axis direction. Alternatively, the toroidal lens pressing portion 41 may be configured to face the X-axis direction.

  Furthermore, although the UV irradiation unit 1 in the said embodiment was set as the structure provided with the LED board | substrate 15 provided with the four LED elements 20, the spherical lens 30, and the toroidal lens 40 10 each, it is not limited to this. An arbitrary number of LED elements 20, spherical lenses 30, and toroidal lenses 40 may be provided. In this way, by combining a plurality of types of UV irradiation units, it is possible to configure UV irradiation apparatuses corresponding to various sizes. Thereby, it becomes possible to implement | achieve UV irradiation apparatus corresponding to the workpiece | work of various sizes with an easy structure.

DESCRIPTION OF SYMBOLS 1 UV irradiation unit 100 LED unit 10 LED support part 15 LED board 20 LED element 200 Lens unit 30 Spherical lens 31 Lens accommodating part 310 Spherical lens support part 320 Toroidal lens support part 330 Fixing part 32 Lens holding frame 33 Positioning pin 40 Toroidal lens 41 Toroidal lens pressing part 410 Tongue piece part 420 Notch part 430 Screw hole 43, 44 Notch 45 Fixing screw 50 Mounting screw

Claims (14)

A light irradiation unit that irradiates line-shaped light having a predetermined line width in a second direction that extends in a first direction and is orthogonal to the first direction on an irradiation surface,
A substrate,
N pieces (N is 2) are arranged on the substrate at predetermined intervals along the first direction with the direction of the optical axis aligned in the third direction orthogonal to the first direction and the second direction. An integer greater than or equal to)
N lenses arranged on the optical path of each light source;
A lens support that abuts the periphery of the edge on the first surface side of each lens and supports each lens on a predetermined plane defined by the first direction and the second direction;
At least a pair of plate-like lens pressing portions disposed to face each other so as to sandwich the N lenses from the second direction;
Projecting from the tip of the lens pressing portion onto the second surface of each lens, elastically pressing the periphery of the edge on the second surface side, urging each lens against the lens support portion, and A plurality of tongue pieces for positioning each lens in the first direction and the second direction;
A light irradiation unit comprising:   The plurality of tongue pieces are provided so as to press four points that are point-symmetrical with respect to the optical axis of each lens when viewed from the third direction. The light irradiation unit according to 1.   Each said tongue piece part protrudes in a rectangular shape when it sees from the said 3rd direction, The corner of the front-end | tip of each said tongue piece part presses the said 2nd surface of each said lens, It is characterized by the above-mentioned. The light irradiation unit according to claim 1 or 2.   Each tongue piece portion is disposed so as to project in a rectangular shape when viewed from the third direction and straddle between two lenses adjacent to each other in the first direction, and the tip of each tongue piece portion 3. The light according to claim 1, wherein one corner presses one of the two lenses, and the other corner of the tip of each tongue piece presses the other of the two lenses. Irradiation unit.   5. The light irradiation unit according to claim 1, wherein the lens pressing portion has a cutout portion extending along the third direction between the tongue pieces. .   6. The convex surface having a positive refractive power in at least the second direction is formed on the second surface side of each lens. 6. Light irradiation unit.   The light irradiation unit according to claim 6, wherein the second surface of each lens is a cylindrical surface, a toroidal surface, or a spherical surface.   The light irradiation unit according to any one of claims 1 to 7, wherein each of the lenses has a circular shape when viewed from the third direction.   The light irradiation unit according to any one of claims 1 to 7, wherein each of the lenses has a rectangular shape when viewed from the third direction.   The light irradiation unit according to claim 9, wherein each of the lenses is connected along the first direction.   The lens pressing portion is connected to the lens support portion so as to be movable along the third direction, and when fixed to the lens support portion, between the predetermined plane and each tongue piece portion. The light irradiation unit according to any one of claims 1 to 10, wherein the light irradiation unit moves so that the distance decreases.   The light irradiation unit according to any one of claims 1 to 11, wherein the first surface of each lens is any one of a concave surface, a convex surface, and a flat surface.   The light source unit according to any one of claims 1 to 12, wherein the light source includes at least one LED (Light Emitting Diode) element.   The light irradiation unit according to any one of claims 1 to 13, wherein the light is light including a wavelength that acts on an ultraviolet curable resin.

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