TWI741130B - Light irradiating device - Google Patents

Abstract

A light irradiation device can obtain ultraviolet light of a specific intensity on the outer peripheral surface of the irradiation target without changing the irradiation intensity or the irradiation time even if the size of the irradiation target is changed. With respect to a three-dimensional irradiation target that rotates around a central axis extending in the first direction and has a different size in a second direction orthogonal to the first direction, it is arranged in the second direction, from the second direction to the irradiation target The light irradiation device for irradiating ultraviolet light on the outer peripheral surface of the light irradiation device includes: a plurality of LED elements arranged in a first direction on a substrate and irradiating ultraviolet light with respect to the irradiation target; and a light collecting unit arranged in the light path of the plurality of LED elements , Which refracts or reflects the ultraviolet light emitted from each LED element, and emits condensed light toward the central axis.

Description

Light irradiation device

The present invention relates to a light irradiation device, which uses an LED (Light Emitting Diode) as a light source to irradiate ultraviolet light on a three-dimensional irradiation object rotating around a central axis.

Currently, as inks used for printing on containers such as beer or juice cans/plastic bottles, shampoo or cosmetic bottles, etc., ultraviolet-curable inks that are cured by irradiation with ultraviolet light are used. In addition, when curing such an ultraviolet curable ink, an ultraviolet light irradiation device that irradiates ultraviolet light is generally used.

For example, Patent Document 1 describes an image forming apparatus that uses an ink jet head to form an image on the outer peripheral surface of a can (irradiation target). This device has a support cylinder (mandrel) inserted into the can body to support the can body, an ink nozzle that ejects ultraviolet-curable ink against the outer peripheral surface of the can body supported by the support cylinder, a UVLED lamp, and the like. In addition, the device of Patent Document 1 sprays ultraviolet-curable ink while rotating the can body to form an image on the outer circumferential surface of the can body, and irradiates the outer circumferential surface of the can body with ultraviolet light from a UVLED lamp to make The ultraviolet curable ink adhered to the outer peripheral surface of the can is cured.

[Prior Art Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 2016-013548

According to the structure of Patent Document 1, the ultraviolet-curable ink adhering to the outer peripheral surface of the can body can be cured by the UVLED lamp arranged parallel to the center axis of the can body. However, since the UVLED lamp is fixed at a certain distance away from the support tube (ie, the outer circumferential surface of the can body), if the size (diameter) of the can body is different, the working distance (the outer circumferential surface of the can body and the UVLED lamp The distance between the tanks) will change, and the intensity of the ultraviolet light at the outer peripheral surface of the tank will also change. Therefore, there is the following problem. The intensity of light irradiation, or the irradiation time must be changed. In addition, there is a problem of preparation time for changing the irradiation intensity or irradiation time of ultraviolet light.

The present invention was made in view of this situation, and its object is to provide a light irradiation device that enables a specific light irradiation device to be obtained on the outer peripheral surface of the irradiation target without changing the irradiation intensity or irradiation time even if the size of the irradiation target changes. Intensity of ultraviolet light.

In order to achieve the above-mentioned object, the light irradiation device of the present invention is arranged in a second direction orthogonal to the first direction with respect to a three-dimensional irradiation target rotating around a central axis extending in the first direction. The outer peripheral surface of the irradiation target is irradiated with ultraviolet light, and the light irradiation device has: a plurality of LED elements arranged in a first direction on the substrate and irradiating ultraviolet light with respect to the irradiation target; and a condensing unit arranged in a plurality of In the light path of the LED element, refract the ultraviolet light emitted from each LED element Or reflect to emit convergent light toward the central axis. In an embodiment, the sizes of the three-dimensional irradiation objects in the second direction may be different from each other.

According to this configuration, even if the size of the irradiation target (the size in the second direction) changes, the ultraviolet light is reliably incident on the outer peripheral surface of the irradiation target, and therefore ultraviolet light of a specific intensity is obtained on the outer peripheral surface of the irradiation target.

In addition, it is preferable that the light condensing unit is a reflecting mirror having a reflecting surface that condenses light toward the central axis. In addition, in this case, preferably, the reflective surface is a curved surface including an ellipse or a paraboloid.

In addition, preferably, the condensing unit is a cylindrical lens extending in the first direction, and is arranged such that the optical axis of the plurality of LED elements and the optical axis of the cylindrical lens face the central direction of the illuminated object when viewed from the first direction.

In addition, preferably, the condensing unit condenses the ultraviolet light toward the central axis.

In addition, from another point of view, the light irradiation device of the present invention is arranged in a second direction orthogonal to the first direction with respect to a three-dimensional irradiation target rotating around a central axis extending in the first direction. Ultraviolet light is irradiated to the outer peripheral surface of the irradiation target in the second direction. The light irradiation device has N light source units having a substrate and a plurality of LED elements arranged on the substrate along the first direction and irradiating the irradiation target with ultraviolet light. N is an integer greater than or equal to 1; and N optical elements are arranged in the light path of a plurality of LED elements, and the ultraviolet light emitted from each LED element is shaped into light having a specific line width when viewed from the first direction, Among them, the configuration is such that when viewed from the first direction, the optical axis of the plurality of LED elements and the optical axis of the optical element face the center direction of the irradiation target, and the specific line width is set to be smaller than the diameter of the irradiation target. In addition, in this case, it is preferable that the optical axis of the plurality of LED elements and the optical axis of the optical element pass through the central axis when viewed from the first direction. Moreover, the sizes of the three-dimensional illuminating objects in the second direction may be different from each other.

In addition, in this case, preferably, N is greater than or equal to 2. When viewed from the first direction, the N light source units and the N optical elements are arranged on an arc centered on the central axis.

In addition, preferably, the optical element is a cylindrical lens extending in the first direction.

In addition, from another point of view, the light irradiation device of the present invention is arranged in a second direction orthogonal to the first direction with respect to a three-dimensional irradiation object rotating around a central axis extending in the first direction. The second direction irradiates ultraviolet light to the outer peripheral surface of the irradiation target, and the light irradiation device has: a plurality of LED elements arranged along the first direction on the substrate and irradiates the ultraviolet light with respect to the irradiation target; a pair of light guide mirrors, It is arranged to sandwich the light path of the plurality of LED elements from a third direction orthogonal to the first direction and the second direction, and to guide the ultraviolet light with respect to the irradiated object; and the moving unit to make the plurality of LED elements and The pair of light guide mirrors move in the second direction corresponding to the diameter of the irradiated object. In an embodiment, the sizes of the three-dimensional irradiation objects in the second direction may be different from each other.

In addition, in this case, it is preferable to configure the optical axis of the plurality of LED elements to pass through the central axis when viewed from the first direction.

In addition, preferably, the interval between the pair of light guide mirrors is set to be smaller than the diameter of the irradiated object.

As described above, according to the light irradiation device of the present invention, even if the size of the irradiation target is changed, it is possible to obtain ultraviolet light of a specific intensity on the outer peripheral surface of the irradiation target without changing the irradiation intensity or irradiation time.

1. 1A, 1B, 1C: light irradiation system

10, 10A, 10B, 10C: light irradiation device

11: Abutment

12: Light source unit

12a: substrate

12b: LED components

14: Elliptical mirror

14a: reflective surface

15, 15B: Condenser lens

17: light guide mirror

20: Lifting mechanism

50: Support tube

AX: central axis

P, P1, P2: Irradiated object

p: interval

FIG. 1 is a perspective view showing the structure of a light irradiation system using the light irradiation device according to the first embodiment of the present invention.

2 is a front view explaining the structure of a light source unit included in the light irradiation device according to the first embodiment of the present invention.

3 is a light ray diagram explaining ultraviolet light irradiated to an irradiation target from the light irradiation device according to the first embodiment of the present invention.

4 is a diagram for explaining the structure of a light irradiation system using the light irradiation device according to the second embodiment of the present invention.

FIG. 5 is a diagram for explaining the structure of a light irradiation system using the light irradiation device according to the third embodiment of the present invention.

6 is a diagram for explaining the structure of a light irradiation system using the light irradiation device according to the fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same or equivalent parts in the figures are denoted by the same reference numerals, and the description thereof will be omitted.

(First embodiment)

FIG. 1 is a perspective view showing the structure of a light irradiation system 1 using a light irradiation device 10 according to the first embodiment of the present invention. As shown in FIG. 1, the light irradiation system 1 is a system for curing the ultraviolet curable ink applied on the surface of the irradiation target P, and includes a support cylinder inserted into the irradiation target P to support the irradiation target P (Mandrel) 50 and a light irradiation device 10 that irradiates the outer peripheral surface of the irradiation target P with linear ultraviolet light. The support cylinder 50 is moved in a clockwise direction by a motor not shown With the rotation, with the rotation of the support tube 50, the irradiation target P attached to the front end of the support tube 50 rotates. In addition, as shown in FIG. 1, in this embodiment, for the convenience of description, the irradiation target P is assumed to have a substantially cylindrical shape, and the rotation center of the irradiation target P is described as the central axis AX. In addition, in the following, in this specification, the long side (line length) direction of the linear ultraviolet light emitted from the light irradiation device 10 is defined as the X axis direction, and the short side direction is defined as the Y axis direction. The direction in which the axis is orthogonal is defined as the Z axis and will be described. In addition, the term “ultraviolet light” generally refers to light having a wavelength of 400 nm or less. In this specification, the term “ultraviolet light” refers to light having a wavelength (for example, a wavelength of 250 to 420 nm) that can cure an ultraviolet curable ink.

As shown in FIG. 1, the light irradiation device 10 of this embodiment includes a base 11, a light source unit 12, an elliptical reflector 14, and a housing (not shown) for accommodating the base 11, the light source unit 12, and the elliptical reflector 14. Show) etc.

The base 11 is a metal plate-shaped member parallel to the X-axis direction and the Y-axis direction. The so-called heat sink functions as a component that dissipates the generated heat.

FIG. 2 is a front view of the light source unit 12 (a view viewed from the positive direction side of the Z axis). As shown in FIG. 2, the light source unit 12 has a rectangular substrate 12a parallel to the X-axis direction and the Y-axis direction, and a plurality of LED elements 12b arranged on the substrate 12a.

The substrate 12a is a rectangular wiring substrate formed of a material with high thermal conductivity (for example, aluminum nitride), as shown in FIG. ) Mount 10 LED components 12b. An anode pattern (not shown) and a cathode pattern (not shown) for supplying power to each LED element 12b are formed on the substrate 12a, and each LED element 12b is electrically connected to the anode pattern and the cathode pattern, respectively. In addition, the substrate 12a uses a wiring cable (not shown) and A driving circuit (not shown) is electrically connected, and a driving current is supplied from the driving circuit to each LED element 12b via the anode pattern and the cathode pattern. When a driving current is supplied to each LED element 12b, ultraviolet light (for example, a wavelength of 365 nm) corresponding to the driving current is emitted from each LED element 12b, and linear ultraviolet light parallel to the X-axis direction is emitted from the light source unit 12.

If power is supplied to the light source unit 12 and ultraviolet light is emitted from each LED element 12b, the temperature of the LED element 12b rises due to the self-heating of the LED element 12b, resulting in a problem of a significant decrease in luminous efficiency. However, in this embodiment, the base 11 is used. Since the light source unit 12 is cooled, the occurrence of such a problem can be suppressed.

The elliptical reflector 14 is a metal member for reflecting the ultraviolet light from the light source unit 12, and is installed in a housing (not shown) so as to cover the light source unit 12 from the positive direction side of the Z axis (Figure 1). The surface of the elliptical reflector 14 opposite to the light source unit 12 is coated with a light reflective material such as a metal film to form a reflective surface 14a. The reflective surface 14a of the elliptical mirror 14 of the present embodiment is an elliptical surface extending in the X-axis direction, and when viewed from the X-axis direction, the LED elements 12b of the light source unit 12 are arranged at the first focal position.

FIG. 3 is a light ray diagram explaining the ultraviolet light irradiated to the irradiation target P from the light irradiation device 10 of the present embodiment. In addition, in FIG. 3, P1 represents the irradiation target P of the smallest size (for example, 20 mm in diameter), and P2 represents the irradiation target P of the largest size (for example, 60 mm in diameter).

As shown in FIG. 3, in the present embodiment, the central axis AX of the irradiated object P is arranged at the second focal position of the elliptical mirror 14, and the ultraviolet light (each light ray) emitted from the light source unit 12 is directed toward the irradiated object. The central axis AX of the object P condenses light. Therefore, no matter when the size of the irradiation target P is small (P1) or when the size of the irradiation target P is large (P2), the ultraviolet light emitted from the light source unit 12 is surely incident on the irradiation target The outer peripheral surface of the thing P. Therefore, even if the irradiated object P is changed It is also possible to obtain ultraviolet light of a specific intensity on the outer peripheral surface of the irradiation target P. That is, according to the configuration of the present embodiment, it is not necessary to change the irradiation intensity or the irradiation time every time the size of the irradiation target P is changed. In other words, in the present invention, even if the size (diameter or radius) of the irradiation target P rotating around the central axis AX is changed, the outer peripheral surface of the irradiation target P can be irradiated with ultraviolet light of a specific intensity.

The foregoing 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, on each LED element 12b of this embodiment, a hemispherical or cannonball-shaped package lens may also be arranged. According to this structure, since the spread angle of the ultraviolet light emitted from each LED element 12b can be narrowed, the size of the elliptical mirror 14 can be reduced.

In addition, in the present embodiment, it has been described that the central axis AX of the irradiation target P is arranged at the second focal position of the elliptical mirror 14, and the ultraviolet light (each light beam) emitted from the light source unit 12 is directed toward the center of the irradiation target P. The axis AX condenses light, but it is not necessarily limited to this structure. The elliptical mirror 14 only needs to have a reflective surface that converges light toward the central axis AX, and instead of the elliptical mirror 14, a parabolic mirror having a parabolic mirror may be used.

(Second embodiment)

4 is a diagram illustrating the configuration of a light irradiation system 1A using the light irradiation device 10A according to the second embodiment of the present invention, and is a ray diagram when the light irradiation device 10A of this embodiment is viewed from the X-axis direction. As shown in FIG. 4, the light irradiation device 10A of this embodiment is different from the light irradiation device 10 of the first embodiment in that the light source unit 12 is mounted downward (toward the negative side of the Y axis) instead of an ellipse. The reflecting mirror 14 has a condenser lens 15. In addition, the condenser lens 15 is fixed in a housing (not shown) by a fixing member not shown.

The condenser lens 15 is an optical member for condensing the ultraviolet light from the light source unit 12 to the central axis AX of the irradiation target P, and is arranged in the optical path of the LED element 12b. The condenser lens 15 of this embodiment is an optical glass or a biconvex cylindrical lens made of silicon extending in the X-axis direction. When viewed from the X-axis direction, the condenser lens 15 is arranged on the optical axis of the LED element 12b and the optical axis of the condenser lens 15 It passes through the central axis AX of the irradiation target P, and is configured to refract the ultraviolet light (each light ray) emitted from the LED element 12b in the Z-axis direction and condense it toward the central axis AX of the irradiation target P. Therefore, no matter when the size of the irradiation target P is small (P1) or when the size of the irradiation target P is large (P2), the ultraviolet light emitted from the light source unit 12 is surely incident on the irradiation target The outer peripheral surface of P. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of the present embodiment, every time the size of the irradiation target P is changed, it is not necessary to change the irradiation intensity or the irradiation time. In addition, in this embodiment, the optical axis of the LED element 12b and the optical axis of the condenser lens 15 pass through the central axis AX of the illuminated object P, but it is not necessarily limited to this structure, as long as the LED element 12b is arranged so that The optical axis of φ and the optical axis of the condenser lens 15 may be directed toward the center direction of the irradiation target P.

(Third Embodiment)

FIG. 5 is a diagram illustrating the configuration of a light irradiation system 1B using the light irradiation device 10B according to the third embodiment of the present invention, and is a ray diagram when the light irradiation device 10B of this embodiment is viewed from the X-axis direction. As shown in FIG. 5, the light irradiation device 10B of this embodiment is different from the light irradiation device 10A of the second embodiment in that it has three light source units 12 and three condenser lenses 15B, and is configured to The ultraviolet light emitted from each condenser lens 15B becomes substantially parallel light.

The condenser lens 15B is an optical component for shaping the ultraviolet light from the light source unit 12 into substantially parallel light, and is arranged in the optical path of the LED element 12 b of each light source unit 12. The condenser lens 15B of this embodiment is a biconvex cylindrical lens made of optical glass or silicon extending in the X-axis direction. When viewed from the front, the optical axis of the LED element 12b and the optical axis of the condenser lens 15B are arranged to pass through the central axis AX of the irradiated object P, and the ultraviolet light (each light ray) emitted from the LED element 12b is refracted in the Z-axis direction , Shaping into roughly parallel light with a specific line width.

As shown in FIG. 5, the three light source units 12 and the three condenser lenses 15B of the present embodiment are arranged on an arc centered on the central axis AX of the irradiation target P, and are arranged so that each light source unit 12 The chief ray of the emitted ultraviolet light (a light ray with an expansion angle of 0°) is condensed toward the central axis AX of the irradiated object P. In addition, the line width d of the ultraviolet light emitted from each condensing lens 15B is sufficiently smaller than the diameter of the irradiation target P1 of the smallest size, and is configured to direct the ultraviolet light emitted from each light source unit 12 toward the irradiation target P The outer peripheral surface is reliably incident. That is, no matter when the size of the irradiation target P is small (P1) or when the size of the irradiation target P is large (P2), the ultraviolet light emitted from each light source unit 12 surely enters the irradiation target The outer peripheral surface of the thing P. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of the present embodiment, when changing the size of the irradiation target P, it is not necessary to change the irradiation intensity or irradiation time.

In addition, in this embodiment, the light irradiation device 10B has three light source units 12 and three condenser lenses 15B, but the number of light source units 12 and condenser lenses 15B is not limited to this. The irradiation intensity required for curing of the ultraviolet curable ink applied to the outer peripheral surface of the object P is appropriately changed (that is, a structure using N (N is an integer greater than or equal to 1) light source unit 12 and condenser lens 15B). In addition, in this embodiment, the optical axis of the LED element 12b and the optical axis of the condenser lens 15B pass through the central axis AX of the irradiated object P, but it is not necessarily limited to this structure, as long as the LED element 12b is arranged It is only necessary that the optical axis and the optical axis of the condenser lens 15B face the center direction of the irradiation target P. In addition, the ultraviolet light emitted from the condenser lens 15B is not necessarily limited to substantially parallel light.

(Fourth embodiment)

6 is a diagram illustrating the configuration of a light irradiation system 1C using the light irradiation device 10C according to the fourth embodiment of the present invention, and is a light ray diagram when the light irradiation device 10C of this embodiment is viewed from the X-axis direction. As shown in FIG. 6, the light irradiation system 1C of this embodiment differs from the light irradiation system 1 of the first embodiment in that it has an elevating mechanism that raises and lowers the light irradiation device 10C according to the size (diameter) of the irradiation target P 20, Fig. 6(a) shows a state where the light irradiation device 10C is arranged close to the smallest-sized irradiation target P1, and Fig. 6(b) shows a state where the light irradiation device 10C is arranged close to the largest-sized irradiation target P2 state. In addition, the light irradiation device 10C of this embodiment is different from the light irradiation device 10 of the first embodiment in that the light source unit 12 is mounted downward (toward the negative side of the Y axis) instead of the elliptical mirror 14. There is a pair of light guide mirrors 17. In addition, a well-known mechanism such as a sliding seat can be used for the elevating mechanism 20, but in FIG. 6, for the convenience of description, the elevating mechanism 20 is simply shown as a block.

The pair of light guide mirrors 17 are optical components for guiding the ultraviolet light from the light source unit 12 to the outer peripheral surface of the irradiated object P. The light guide mirrors 17 are arranged to sandwich the LED element 12b from the Z axis direction. Light path. The pair of light guide mirrors 17 in this embodiment are parallel flat mirrors extending in parallel in the X axis direction with a gap p in the Z axis direction.的surface) is formed with a reflective surface.

As shown in FIG. 6(a), when the irradiation target P1 of the smallest size is irradiated, the light source unit 12 moves to a position close to the outer peripheral surface of the irradiation target P1, and is arranged so that the ultraviolet light emitted from the light source unit 12 The chief ray (the ray with an expansion angle of 0°) passes through the central axis AX of the irradiated object P. In addition, the interval p between the pair of light guide mirrors 17 is set to be sufficiently smaller than the diameter of the irradiation target P1, and is configured so that the ultraviolet light emitted from the light source unit 12 reliably enters the outer peripheral surface of the irradiation target P1.

In addition, as shown in FIG. 6(b), when the irradiation target P2 of the largest size is irradiated, the light source unit 12 moves to a position close to the outer peripheral surface of the irradiation target P2, and is arranged so that the light source unit 12 emits The chief ray of the ultraviolet light (the ray with an extension angle of 0°) passes through the central axis AX of the irradiated object P. As described above, since the interval p between the pair of light guide mirrors 17 is set to be sufficiently smaller than the diameter of the irradiation target P1, when the irradiation target P2 of the largest size is irradiated, the light source unit 12 emits The ultraviolet light also reliably enters the outer peripheral surface of the irradiation target P2.

Therefore, in the structure of this embodiment, as in the first to third embodiments, no matter when the size of the irradiation target P is small (P1), or when the size of the irradiation target P is large Bottom (P2), all the ultraviolet light emitted from the light source unit 12 is incident on the outer peripheral surface of the irradiation target P with certainty. Therefore, even if the size of the irradiation target P is changed, ultraviolet light of a specific intensity can be obtained on the outer peripheral surface of the irradiation target P. That is, according to the configuration of the present embodiment, every time the size of the irradiation target P is changed, it is not necessary to change the irradiation intensity or the irradiation time.

In addition, all the content of the embodiment disclosed this time is an illustration, and it should be considered that it is not restrictive. The scope of the present invention is shown not by the above description but by the scope of patent application, and its meaning is to include the meaning equivalent to the scope of patent application and all changes within the scope.

12‧‧‧Light source unit

12a‧‧‧Substrate

12b‧‧‧LED components

14‧‧‧Elliptical mirror

14a‧‧‧Reflecting surface

AX‧‧‧Central axis

P, P1, P2‧‧‧ Irradiated object

Claims (12)

A single light irradiation device is arranged in a second direction orthogonal to the first direction with respect to a three-dimensional irradiation target rotating around a central axis extending in a first direction, and the irradiation target is located in the second direction. The diameter in the two directions is 20 mm to 60 mm, and the outer peripheral surface of the irradiation target is irradiated with linear ultraviolet light extending along the first direction from the second direction, including: a plurality of LED elements on a substrate Are arranged along the first direction and irradiate the ultraviolet light with respect to the irradiation target; The light is refracted or reflected, and condensed light is emitted toward the central axis; wherein, regardless of the size of the irradiation target in the second direction, all of the condensed light can be incident on a part of the outer peripheral surface of the irradiation target. The light irradiation device described in the first item of the scope of patent application, wherein the condensing unit has a reflecting mirror with a reflecting surface that condenses light toward the central axis. According to the light irradiation device described in item 2 of the scope of patent application, the reflecting surface includes an elliptical or parabolic curved surface. The light irradiating device described in claim 1, wherein the condensing unit is a cylindrical lens extending along the first direction, and is configured such that when viewed from the first direction, the plurality of LEDs The optical axis of the element and the optical axis of the cylindrical lens face the center direction of the irradiation target. According to the light irradiation device described in any one of items 1 to 4 in the scope of the patent application, the light collecting unit collects the ultraviolet light toward the central axis. A light irradiation device is arranged in a second direction orthogonal to the first direction with respect to a three-dimensional irradiation target rotating around a central axis extending in a first direction, and the irradiation target is in the The diameter in the second direction is 20 mm to 60 mm, and the outer peripheral surface of the irradiation target is irradiated with linear ultraviolet light extending along the first direction from the second direction, including: N light source units, including a substrate And a plurality of LED elements arranged on the substrate along the first direction and irradiating the ultraviolet light with respect to the irradiation target, wherein N is an integer greater than or equal to 1; and N optical elements are arranged in In the light path of the plurality of LED elements, the ultraviolet light emitted from each of the LED elements is shaped into light having a specific line width when viewed from the first direction; When viewed in one direction, the optical axis of the plurality of LED elements and the optical axis of the optical element face the center direction of the irradiation target, and the specific line width is set to be smaller than the diameter of the irradiation target, regardless of The size of the irradiation target in the second direction is such that all of the ultraviolet light emitted from the optical element can be incident on a part of the outer peripheral surface of the irradiation target. The light irradiating device as described in the scope of patent application, wherein when viewed from the first direction, the optical axis of the plurality of LED elements and the optical axis of the optical element pass through the central axis. The light irradiation device described in item 6 or item 7 of the scope of patent application, wherein the N is greater than or equal to 2, and when viewed from the first direction, the N light source units and the N optical elements It is arranged on a circular arc centered on the central axis. The light irradiating device according to any one of items 6 to 8 of the scope of patent application, wherein the optical element is a cylindrical lens extending in the first direction. A single light irradiation device is arranged in a second direction orthogonal to the first direction with respect to a three-dimensional irradiation object rotating around a central axis extending in a first direction. The diameter of the image object in the second direction is 20 mm to 60 mm, and the outer peripheral surface of the irradiation object is irradiated with linear ultraviolet light extending along the first direction from the second direction, including: a plurality of The LED element is arranged on the substrate along the first direction and irradiates the ultraviolet light with respect to the irradiation target; a pair of light guide mirrors are arranged to be aligned from the first direction and the second direction The light path of the plurality of LED elements is sandwiched in the third direction, and the ultraviolet light is guided with respect to the irradiated object; and a moving unit that causes the plurality of LED elements and the pair of The light guide mirror moves in the second direction corresponding to the diameter of the irradiation target; wherein, regardless of the size of the irradiation target in the second direction, all the light emitted from the pair of light guide mirrors All of the ultraviolet light may be incident on a part of the outer peripheral surface of the irradiation target. The light irradiating device according to claim 10, wherein when viewed from the first direction, the optical axis of the plurality of LED elements passes through the central axis. In the light irradiation device described in claim 10, the interval between the pair of light guide mirrors is set to be smaller than the diameter of the irradiation target.

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