TWI613093B - Light irradiation device - Google Patents

Description

Light irradiation device

The present invention relates to a light irradiation device that illuminates linear irradiation light, and more particularly to a light irradiation device that linearly irradiates illumination light that mixes light of a plurality of wavelengths.

Conventionally, as the ink for lithographic printing, an ultraviolet curable ink which is cured by irradiation with ultraviolet light is used. Further, as a liquid crystal panel, an organic EL (Electro Luminescence) panel or the like, an ultraviolet curable resin is used as an adhesive around the FPD (Flat Panel Display). In the curing of such an ultraviolet curable ink or an ultraviolet curable resin, generally, an ultraviolet light irradiation device that irradiates ultraviolet light is used, particularly in the applications of lithography and FPD, because a wide irradiation area needs to be irradiated, and an irradiation line is used. An ultraviolet light irradiation device that emits light.

As a light-emitting device, a lamp-type irradiation device using a high-pressure mercury lamp or a mercury xenon lamp as a light source has been known as a light source in recent years, in accordance with the demand for reduction in power consumption, long life, and simplification of device size. Development of an ultraviolet light irradiation device using an LED (Light Emitting Diode) instead of a previous discharge lamp (for example, a patent Document 1).

The ultraviolet light irradiation device (LED unit) described in Patent Document 1 includes a plurality of complex LED modules (LED chips) which are arranged side by side in the longitudinal direction (first direction) at regular intervals, and emit a linear light. Piece. Each of the base blocks is inclined at a predetermined angle so that the linear light rays emitted from the respective base blocks are condensed into one line at a predetermined irradiation position, and are spaced apart from each other by a predetermined interval in the short-side direction (second direction). Configuration.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-146646

In lithography, since the peak wavelength of ultraviolet light absorbed (i.e., hardened) differs depending on the kind (for example, color) of the ink, an ultraviolet light irradiation device capable of irradiating ultraviolet light of a plurality of wavelengths is required.

Further, even in the FPD, depending on the type of adhesive used in the model, it is required to be able to irradiate an ultraviolet light irradiation device that mixes ultraviolet light of a plurality of wavelengths in accordance with various adhesives.

The ultraviolet light irradiation device described in Patent Document 1 is provided with two base blocks for emitting linear light having a wavelength of 365 nm, and two base blocks for emitting linear light having a wavelength of 385 nm, so as to The emitted light is condensed into a line in a predetermined irradiation position. In order to solve the problem by mixing 2 wavelengths of light.

However, in the ultraviolet light irradiation device described in Patent Document 1, two base blocks that emit linear light having a wavelength of 365 nm are arranged side by side in the center of the LED unit, and are disposed on the outer side (that is, held at 365 nm). The configuration of the base block of the wavelength is configured to project the two base blocks of the linear light having a wavelength of 385 nm, so that the incident angle of the light at the irradiation position of 365 nm is greatly different from the incident angle of the light of 385 nm. . As described above, when the incident angle of the light at the irradiation position is different, the beam diameter at the irradiation position is also different, and as a result, there is a problem that the light amount distribution (beam profile) of the 365 nm light at the irradiation position is different from the light amount distribution of the light of 385 nm. In the irradiation position, when the light quantity distribution of the 365 nm light is different from the light quantity distribution of the 385 nm light, the line width of the light (the length of the short side of the linear light) and the irradiation intensity (energy) change depending on the wavelength. The occurrence of unevenness in the dry state of the ink occurs, and the problem of hardening of the target adhesive cannot be obtained.

The present invention has been made in view of such circumstances, and an object thereof is to provide a light irradiation device capable of linearly irradiating light of a plurality of wavelengths having a light distribution amount slightly equal.

In order to achieve the above object, the light irradiation device of the present invention irradiates the predetermined irradiation position on the irradiation surface with a linear light having a predetermined line width extending in the first direction and in the second direction orthogonal to the first direction. Light illumination device characterized by having a plurality of optical units; the optical The unit has a plurality of light sources arranged on the substrate at a predetermined interval along the first direction, and the direction of the optical axis is aligned in a direction orthogonal to the substrate surface, and is arranged on the light path disposed in each of the light sources. The light of each light source is a plurality of optical elements shaped to be slightly parallel light, and emits a line of light parallel to the first direction to the illumination surface; and the plurality of optical elements emits N types (N is an integer of 2 or more ) N × M (M is an integer of 1 or more) optical units of light of different wavelengths; N × M optical units are light of different wavelengths of N types when viewed from the first direction The path is arranged in a predetermined order in the circumferential direction around the irradiation position, and the light beams of the respective wavelengths emitted from the N×M optical units are arranged so that the ranges in the second direction are within the predetermined line width.

According to this configuration, the light amount distribution of the light beams of the respective wavelengths emitted from the N×M optical units is slightly uniform on the irradiation surface, so that the ultraviolet curing inks and the ultraviolet curing resin having different curing wavelengths can be stabilized (the hardened state does not occur). Uneven) hardening.

Further, M is 2 or more; and N×M optical units are light lines of light of different wavelengths of the N types of light rays viewed from the first direction, and the light path of the light beam at the irradiation position is used as the axis of symmetry of the irradiation position. Line symmetry is better configured. At this time, the light of any wavelength is preferably the light having the shortest wavelength among the light beams of different wavelengths of the N type. According to this configuration, it is possible to suppress the power consumption of the light source which is inferior in efficiency (that is, with respect to the luminous intensity of the consumed electric power), and suppress heat generation.

Further, the N × M optical units are arranged such that the sum of the ranges of the light beams of the respective wavelengths in the second direction is equal to or smaller than the sum of the sum of the ranges of the light beams of the other wavelengths in the second direction is equal to or less than a predetermined value. good. In this case, it is possible to set the respective incident angles of the light beams of any wavelength to the irradiation surface to be θ _i (i is an integer from 1 to M), and to set the sum of the light beams of any wavelength to the range of the second direction. In the case of α ₀ , the incident angles of the rays of the other wavelengths to the irradiation surface are θ _k (k is an integer from 1 to M), and the sum of the ranges of the light beams of the other wavelengths in the second direction is set to α _{1 .} When the second range is set to β, the following conditional expressions are satisfied.

Moreover, it is preferable that each optical unit is disposed so as to be line symmetrical with the perpendicular line of the irradiation position as the symmetry axis when viewed from the first direction. In this case, it is preferable that each optical unit is disposed on an arc centered on the irradiation position when viewed from the first direction.

Further, M is an even number; in the N × M optical units, M/2 optical units that emit light of different wavelengths of N types are deviated from the first interval by a predetermined interval of 1 for the other M/2 optical units. The /2 distance is better configured. According to this configuration, the irradiation intensity distribution in the first direction of the light emitted from the light irradiation device is slightly uniform.

Further, the plurality of light sources can be arranged in two rows in the direction orthogonal to the first direction on the substrate, and when viewed from the first direction, the light emitted from the light source of one of the rows and the other side The light emitted from the light source in the array is condensed at the irradiation position, and the optical axis of each optical element is deviated from the optical axis of each light source.

Further, it is possible to adopt a configuration in which the light source in one of the rows is arranged in the first direction by a distance of 1/2 of the predetermined interval from the light source in the other row. According to this configuration, the irradiation intensity distribution in the first direction of the light emitted from the light irradiation device is slightly uniform, and the mounting position adjustment of each optical unit is simplified.

Further, the plurality of light sources are surface-emitting LEDs having a light-emitting surface having a substantially square shape, and it is preferable that the diagonal line of one of the light-emitting surfaces is arranged parallel to the first direction.

Further, it is preferable that light of different wavelengths of N types is set to have different intensities depending on each wavelength.

As described above, according to the light-irradiating apparatus of the present invention, light of a plurality of wavelengths having a slightly equal light amount distribution can be linearly irradiated, so that various ultraviolet curable inks and ultraviolet curable resins having different hardening wavelengths can be stably cured.

1,2,3‧‧‧Lighting device

10‧‧‧shell

10a‧‧‧ openings

20,20M‧‧‧Base Block

20Ma, 20Mb, 20Mc, 20Md, 20Me, 20Mf‧‧‧ Mounting inclined surface

50‧‧‧LED unit

100a, 100b, 100aA, 100bA‧‧‧1st LED unit

101‧‧‧Substrate

110,210,310‧‧‧LED modules

111,211,311‧‧‧LED components

113,115‧‧‧ lens

200a, 200b, 200aA, 200bA‧‧‧2nd LED unit

300a, 300b, 300aA, 300bA‧‧‧3rd LED unit

CL1‧‧‧ center line

VL1‧‧‧ vertical line

LL‧‧‧Line length

LW‧‧‧ line width

P‧‧‧ interval

F1‧‧‧ spotlight position

Fig. 1 is an external view of a light irradiation device according to a first embodiment of the present invention.

[Fig. 2] An enlarged view showing the structure and arrangement of the LED unit mounted on the light irradiation device according to the first embodiment of the present invention.

Fig. 3 is an enlarged view showing the structure of the LED unit shown in Fig. 2(a).

Fig. 4 is a view for explaining the internal structure of the LED unit shown in Fig. 3.

[Fig. 5] A light path diagram of ultraviolet light emitted from an LED unit mounted in the light irradiation device according to the first embodiment of the present invention.

FIG. 6 is a view showing a light quantity distribution of ultraviolet light emitted from an LED unit mounted in the light irradiation device according to the first embodiment of the present invention.

[Fig. 7] A diagram showing the relationship between the arrangement of the LED units mounted on the light irradiation device according to the first embodiment of the present invention and the light amount distribution.

FIG. 8 is a view showing a light amount distribution when the second LED unit 200b and the third LED unit 300a according to the first embodiment of the present invention are placed at a position of ±±°° to the center line.

FIG. 9 is a view showing a light amount distribution when the second LED unit 200b and the third LED unit 300a according to the first embodiment of the present invention are placed at a position of ±40° with respect to the center line.

FIG. 10 is a view showing a light amount distribution when the second LED unit 200b and the third LED unit 300a according to the first embodiment of the present invention are placed at a position of ±45° with respect to the center line.

[Fig. 11] The second LED unit 200b and the third LED unit 300a according to the first embodiment of the present invention are disposed at an angle of ± 50° with respect to the center line. A diagram of the light amount distribution at the position.

FIG. 12 is a view showing a light amount distribution when the second LED unit 200b and the third LED unit 300a according to the first embodiment of the present invention are placed at a position of the center line O±55°.

FIG. 13 is a view showing a light amount distribution when the second LED unit 200b and the third LED unit 300a according to the first embodiment of the present invention are placed at a position of ±60° with respect to the center line.

FIG. 14 is a graph showing the relationship between the degree of coincidence γ of the light amount distribution of each wavelength shown in FIGS. 6 and 8 to 13 and the variation width β of the line width LW defined by the arrangement of the LED units.

[Fig. 15] A view showing a structure of an LED unit included in a light irradiation device according to a second embodiment of the present invention.

[Fig. 16] A view showing a mounting structure of an LED unit provided in the light irradiation device according to the third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Incidentally, the same or corresponding portions in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

(First embodiment)

Fig. 1 is an external view of a light irradiation device 1 according to a first embodiment of the present invention. The light irradiation device 1 of the present embodiment is an ultraviolet curable ink used for ink for lithography and a FPD (Flat Panel). In the display device mounted on the ultraviolet light-curing resin used as the adhesive, the device is placed above the object to be irradiated, and emits linear ultraviolet light to the object to be irradiated (Fig. 2(b)). . In the present specification, the long side (line length) direction of the linear ultraviolet light emitted from the light irradiation device 1 is defined as the X-axis direction (first direction), and the short side (line width) direction is defined as the Y-axis direction. (The second direction) will be described by defining the direction orthogonal to the X-axis and the Y-axis (that is, the vertical direction) as the Z-axis direction. Fig. 1(a) is a front view of the light irradiation device 1 as seen from the Y-axis direction. Fig. 1(b) is a bottom view of the light irradiation device 1 as seen from the Z-axis direction (when the upper side is viewed from the lower side of Fig. 1(a)). Fig. 1 (c) is a side view of the light irradiation device 1 when viewed from the X-axis direction (when the left side is viewed from the right side of Fig. 1 (a)).

As shown in FIG. 1, the light irradiation device 1 includes a casing 10, a base block 20, and two first LED units 100a and 100b, two second LED units 200a and 200b, and two third LED units 300a and 300b. The LED unit 50 is constructed. The casing 10 houses the base block 20 and the casing of the LED unit 50. Further, each of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b is a unit that emits linear ultraviolet light parallel to the X-axis (described later in detail).

The base block 20 is a support member for fixing the LED unit 50, and is formed of a metal such as stainless steel. As shown in FIGS. 1(b) and 1(c), the base block 20 is a substantially rectangular plate-like member extending in the X-axis direction, and the lower surface is a recessed cylindrical surface along the Y-axis direction. Under the base block 20 (ie, a partial cylindrical surface) extending in the X-axis direction The first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are arranged side by side in the Y-axis direction (that is, along a partial cylindrical surface), and are fixed by screwing or welding. .

The lower surface of the casing 10 (the lower surface of the light irradiation device 1) has an opening 10a through which the ultraviolet light from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are directed. The irradiation target is configured to be emitted.

FIG. 2 is an enlarged view showing the structure and arrangement of the LED unit 50 mounted on the light irradiation device 1 of the present embodiment. 2(a) is an enlarged view of FIG. 1(b), for convenience of explanation, the base block 20 is omitted, the LED unit 50 shown in FIG. 1(b) is rotated by 90°, and the base block 20 is A portion of the cylindrical surface is unfolded (i.e., extended to the left and right) for disclosure. 2(b) is an enlarged cross-sectional view of FIG. 1(c), showing the arrangement of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b when viewed in the X-axis direction.

3 is an enlarged view showing the structure of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b shown in FIG. 2(a). 4 is a view showing an internal structure of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b shown in FIG. 3, and is a cross-sectional view taken along line A-A' of FIG. 3. Further, in the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b of the present embodiment, since only the wavelengths of the ultraviolet light emitted from the respective LED units are different, the other structures are common, and therefore, Representing the purple of the same wavelength The first LED units 100a and 100b of the external light will be described.

2(a), as shown in FIG. 3, each of the first LED units 100a and 100b includes a rectangular substrate 101 extending in the X-axis direction and a plurality of LED modules 110. Further, in the first LED units 100a and 100b of the present embodiment, 40 LED modules 110 are mounted. However, in FIGS. 2(a) and 3, a part of the disclosure will be omitted for convenience of viewing.

In the LED module 110 of the first LED units 100a and 100b, the center line CL1 of the substrate 101 extending in the X-axis direction is interposed so as to be densely arranged on the substrate 101 in two rows (Y-axis direction) × 20 (X-axis direction). The two-dimensional square lattice shape is electrically connected to the substrate 101. The substrate 101 of the first LED units 100a and 100b is connected to an LED driving circuit (not shown), and the driving current from the LED driving circuit is supplied to the LED module 110 through the substrate 101. When a driving current is supplied to each of the LED modules 110, ultraviolet light corresponding to the amount of light of the driving current is emitted from each of the LED modules 110, and linear ultraviolet rays parallel to the X-axis are emitted from the first LED units 100a and 100b, respectively. Further, each of the LED modules 110 of the present embodiment adjusts the drive current supplied to each of the LED modules 110 by emitting ultraviolet light of a slightly different amount of light, and is linearly emitted from the first LED units 100a and 100b. The ultraviolet light system has a slightly uniform light amount distribution in the X-axis direction. Further, as shown in FIGS. 2(a) and 3, the interval P of each of the LED modules 110 of the present embodiment is set to be about 12 mm.

As shown in FIGS. 3 and 4, each of the LED modules 110 of the first LED units 100a and 100b is provided with an LED (Light Emitting Diode). Element 111 (light source), lens 113, and lens 115 (optical element).

The LED element 111 has a substantially square light-emitting surface, receives a supply of a drive current from the LED drive circuit, and emits ultraviolet light having a wavelength of 365 nm. The LED element 111 is mounted on the substrate 101 such that the two diagonal lines of the light-emitting surface are inclined by 45° so as to face the X-axis direction and the Y-axis direction, respectively. Therefore, the LED elements 111 of the adjacent LED modules 110 are disposed close to each other in a state in which the respective sides of the light-emitting surface are arranged in the X-axis direction or the Y-axis direction (that is, not inclined at 45°). The ultraviolet light from the adjacent LED modules 110 is also emitted in a state close to each other.

A lens 113 and a lens 115 (FIG. 4) held by a lens holding portion (not shown) are disposed on the optical axis of each of the LED elements 111 of the LED module 110. The lens 113 is formed by injection molding of, for example, a decane resin, and the side of the LED element 111 is a plano-convex lens that condenses ultraviolet light incident on one side while diffusing from the LED element 111, and guides the light to the lens at the rear stage. 115. The lens 115 is formed by injection molding of, for example, a decane resin, and the lenticular lens having both the incident surface and the exit surface is convex, and the ultraviolet light incident from the lens 113 is formed into a substantially parallel light. Therefore, the lens 115 (i.e., each of the LED modules 110) emits slightly parallel ultraviolet light having a predetermined beam diameter. Further, the lens 113 and the lens 115 of the present embodiment are designed such that the beam diameter of the emitted ultraviolet light in the X-axis direction is about 18 mm (half width), and the beam diameter in the Y-axis direction is about 12 mm (half width).

As described above, the LED module 110 of the present embodiment is The substrate 101 is densely arranged in two rows (Y-axis direction) × 20 (X-axis direction) in a two-dimensional square lattice shape, and ultraviolet light from the adjacent LED modules 110 is emitted in a state close to each other. Way composition. Therefore, linear ultraviolet light extending in the X-axis direction from each of the first LED units 100a and 100b is discharged in two rows in the Y-axis direction.

Further, as shown in FIG. 4, in the present embodiment, the optical axis of the lens 113 coincides with the lens 115, and the optical axis of the lens 113 and the lens 115 with respect to the optical axis of the LED element 111 (through the central axis of the center of the light-emitting surface) ), offset in the Y-axis direction to configure. That is, the optical axis of the lens 113 and the lens 115 of each LED module 110 is biased toward the center of the substrate 101 (center line CL1), and is only biased by a predetermined distance. Therefore, the optical path of the ultraviolet light emitted from the LED element 111 is bent to the inner side (the center line CL1 side) by the lens 113 and the lens 115. As will be described later, the first LED units 100a and 100b of the present embodiment are arranged such that the perpendicular line VL1 (virtual line) of the substrate 101 passing through the center line CL1 of the substrate 101 passes through the condensing position F1 (FIG. 2(b) and FIG. 4) The linear ultraviolet light emitted from the first LED units 100a and 100b gradually approaches the vertical line VL1 as it leaves the first LED units 100a and 100b, and intersects at the condensing position F1.

As described above, the second LED units 200a and 200b and the third LED units 300a and 300b of the present embodiment are different from the first LED units 100a and 100b in that the wavelengths of the ultraviolet light emitted only differ. Specifically, the second LED unit 200a, 200b is provided with an LED module having an LED element 211 that emits ultraviolet light having a wavelength of 385 nm. In the same manner as the first LED units 100a and 100b, the linear ultraviolet light extending in the X-axis direction from each of the second LED units 200a and 200b is emitted in two rows in the Y-axis direction. Then, the linear ultraviolet light emitted from the second LED units 200a and 200b is formed so as to intersect at the condensing position F1. Further, the third LED units 300a and 300b are provided with an LED module 310 having an LED element 311 that emits ultraviolet light having a wavelength of 405 nm, and extends from the third LED units 300a and 300b in the X-axis direction, similarly to the first LED units 100a and 100b. The linear ultraviolet light is emitted in two rows side by side to the Y-axis direction. Then, the linear ultraviolet light emitted from the respective third LED units 300a and 300b is formed so as to intersect at the condensing position F1. In other words, in the present embodiment, three different wavelengths of ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are collected at the condensing position F1. Therefore, at the condensing position F1, one linear light beam of three wavelengths is formed. Further, according to JIS Z8120, light having a wavelength of 405 nm is defined as visible light. However, in the present embodiment, for convenience of explanation, ultraviolet light will be described.

Next, the arrangement of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b will be described. As shown in FIG. 2(b), in the light irradiation device 1 of the present embodiment, the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are viewed along the X-axis direction. The lower surface of the abutment block 20 (that is, a partial cylindrical surface) is arranged in an arc shape. Then, from the first LED unit 100a, The ultraviolet light of the 100b, the second LED units 200a and 200b and the third LED units 300a and 300b is emitted toward the condensing position F1 on the irradiation surface R of the reference, and is irradiated on the reference irradiation surface R with the condensing position F1 as the center. The range of the line width LW is configured. In the present embodiment, the line width LW of the ultraviolet light is set to ±20 mm with respect to the condensing position F1, and the line length LL (length in the X-axis direction) is set to be about 200 mm.

Further, in the light irradiation device 1 of the present embodiment, a position away from the lower end of the casing 10 (Z-axis direction) by 90 mm (that is, a position at a working distance of 90 mm (shown in FIG. 2(b)) is shown. The XY plane of the "WD90")) is the reference irradiation surface R, and the object to be irradiated is configured to be transported from the right to the left in the Y-axis direction on the reference irradiation surface R by a transport device (not shown). Therefore, the object to be irradiated is sequentially transported from the right to the left on the reference irradiation surface R, and the ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b is sequentially moved ( Scanning is performed on the object to be irradiated, and the ultraviolet curable ink or the ultraviolet curable resin on the object to be irradiated is sequentially hardened (fixed). In FIG. 2(b), for convenience of explanation, the perpendicular line of the irradiation surface R of the reference passing through the condensing position F1 is revealed as the center line O of the optical path of the ultraviolet light emitted from the light irradiation device 1.

Further, as shown in FIG. 2(a), when the light irradiation device 1 of the present embodiment is viewed from the Z-axis direction, the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are turned from the right side. On the left side (that is, along the Y axis), the third LED unit 300a, the first LED unit 100a, the second LED unit 200a, and the third LED The unit 300b, the first LED unit 100b, and the second LED unit 200b are arranged in this order. Then, the first LED unit 100a disposed from the right side is biased by P/2 only in the X-axis direction with respect to the fifth LED unit 100b disposed from the right side (that is, the LED module 110) The distance of the interval P is 1/2) to configure.

As described above, the LED modules 110 of the first LED units 100a and 100b are densely arranged in parallel in the X-axis direction. However, the ultraviolet light emitted from each of the LED modules 110 is slightly parallel light, so that the adjacent LED modules are adjacent. The ultraviolet light emitted from the group 110 does not overlap in the X-axis direction, but becomes a comb-like light amount distribution. Therefore, in the present embodiment, the first LED unit 100a disposed in the second direction from the right side is disposed with respect to the fifth LED unit 100b arranged on the right side, and is offset by a distance of only P/2. When the ultraviolet light from each of the first LED units 100a and 100b is irradiated onto the object to be irradiated, the portion of the light amount distribution becomes a slightly uniform light amount distribution in the X-axis direction.

In the same manner, the second LED unit 200a disposed from the right side is disposed with respect to the second LED unit 200b disposed from the right side, and is disposed only by a distance of P/2 in the X-axis direction. When the ultraviolet light of the second LED units 200a and 200b is irradiated onto the object to be irradiated, the light amount distribution is slightly uniform in the X-axis direction. In addition, the third LED unit 300a disposed on the rightmost side is disposed at a distance of P/2 from the X-axis direction with respect to the fourth LED unit 300b disposed from the right side, and is derived from each of the third LED units 300a. When the ultraviolet light of 300b is irradiated onto the object to be irradiated, it becomes a slightly uniform amount of light in the X-axis direction. cloth.

As described above, the light irradiation device 1 of the present embodiment is arranged side by side in a predetermined order by linear ultraviolet light of three wavelengths emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b. Ultraviolet-curing ink or ultraviolet curable resin on the object to be irradiated is irradiated onto the object to be irradiated (that is, the condensing position F1 on the reference irradiation surface R) in the circumferential direction around the condensing position F1. Hardened (fixed). For example, when the use of lithography is used, the peak wavelength of ultraviolet light absorbed (that is, hardened) according to the type of ink (for example, color) is different, but according to the mixing of three wavelengths of ultraviolet light, various types can be used ( At least three or more types of inks can be fixed by one exposure (irradiation) even if the object to be irradiated with a plurality of layers of ink is laminated. Moreover, when it is used for the subsequent use of the FPD, various adhesives having different curing wavelengths may be used, and the use of the light source and the light irradiation device may be used depending on the adhesive to be used, and exchange is not required.

Here, in order to stabilize various ultraviolet curable inks or ultraviolet curable resins having different hardening wavelengths (that is, hardening does not cause unevenness in the hardened state), a plurality of linear ultraviolet rays having different wavelengths are used as much as possible. It is preferable to collect light in such a manner that the same amount of light is distributed on the object to be irradiated. Therefore, in the present embodiment, when the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are viewed from the Z-axis direction, they are arranged side by side from the right side to the left side (that is, along the Y axis). The third LED unit 300a, the first LED unit 100a, the second LED unit 200a, the third LED unit 300b, and the first LED unit In the order of the first LED units 100a and 100b, the arrangement of the second LED units 200a and 200b and the arrangement of the third LED units 300a and 300b (described later) are determined based on the arrangement of the first LED units 100a and 100b.

Fig. 5 is a light path diagram of ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b of the present embodiment. Fig. 5(a) is a view showing a light path of ultraviolet light emitted from the first LED units 100a and 100b, and Fig. 5(b) is a view showing a light path of ultraviolet light emitted from the second LED units 200a and 200b, and Fig. 5(c) The light path diagram of the ultraviolet light emitted from the third LED units 300a and 300b is disclosed. Further, as shown in FIG. 4, the ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b of the present embodiment is strictly gathered at the condensing position F1. In the light mode, the working distance has a sufficient length with respect to the beam path of the ultraviolet light in the Y-axis direction, and the incident surface R can be similar to the slightly parallel light. Therefore, in FIG. 5, from the first LED unit 100a, The ultraviolet light emitted from 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b is revealed as parallel light.

As shown in Fig. 5 (a), the first LED units 100a and 100b of the present embodiment are arranged on an arc of a circumference having a radius of 125 mm centering on the condensing position F1, as viewed in the X-axis direction, with respect to the center. Line O, ±18° (for the center line O clockwise is set to +, counterclockwise is set to -). In other words, the first LED units 100a and 100b are arranged in a line with the center line O as an axis of symmetry when viewed from the X-axis direction. symmetry.

Further, as described above, the linear ultraviolet light emitted from the first LED units 100a and 100b is configured to cross (converge) at the condensing position F1 when viewed from the X-axis direction. The total of four (four rows) linear ultraviolet light emitted from the first LED units 100a and 100b is irradiated in the range of the line width LW of the reference irradiation surface R (that is, on the object to be irradiated). Further, in the present embodiment, since the incident angle of the ultraviolet light emitted from the first LED units 100a and 100b to the reference irradiation surface R is 18°, the ultraviolet light emitted from the first LED units 100a and 100b is based on the reference. The line width LW on the irradiation surface R is equal, and is 12.55 mm in the present embodiment.

As shown in Fig. 5 (b), the second LED units 200a and 200b of the present embodiment are arranged on an arc of a circumference having a radius of 125 mm centering on the condensing position F1, as viewed in the X-axis direction, with respect to the center. Line O, +6°, -30° position. In addition, as described above, the linear ultraviolet light emitted from the second LED units 200a and 200b is configured to cross (converge) at the condensing position F1 when viewed from the X-axis direction. The total of four (four rows) linear ultraviolet light emitted from the second LED units 200a and 200b is irradiated in the range of the line width LW of the reference irradiation surface R (that is, on the object to be irradiated). Further, in the present embodiment, since the ultraviolet light emitted from the second LED units 200a and 200b is different from the reference irradiation surface R by 6° and 30°, the ultraviolet light emitted from the second LED units 200a and 200b is emitted from the second LED units 200a and 200b. The line width LW on the irradiation surface R of the reference of ultraviolet light is also different. In the present embodiment, it is arranged from the center line The line width LW of the ultraviolet light emitted from the second LED unit 200a at the position of 0, +6° on the reference irradiation surface R is 12.01 mm, and is emitted from the second LED unit 200b disposed at a position of -30° to the center line O. The line width LW of the ultraviolet light on the reference irradiation surface R was 13.79 mm.

As shown in Fig. 5 (c), the third LED units 300a and 300b of the present embodiment are disposed on an arc of a circumference having a radius of 125 mm centering on the condensing position F1 as viewed in the X-axis direction with respect to the center. Line O, +30°, -6° position. In addition, as described above, the linear ultraviolet light emitted from the third LED units 300a and 300b is configured to cross (converge) at the condensing position F1 when viewed from the X-axis direction. The total of four (four rows) linear ultraviolet light emitted from the third LED units 300a and 300b is irradiated in the range of the line width LW of the reference irradiation surface R (that is, on the object to be irradiated). Further, in the present embodiment, since the ultraviolet light emitted from the third LED units 300a and 300b is different from the reference irradiation surface R by 30° and 6°, it is emitted from the third LED units 300a and 300b. The line width LW on the irradiation surface R of the reference of ultraviolet light is also different. In the present embodiment, the line width LW of the ultraviolet light emitted from the third LED unit 300a disposed at the position of +30° to the center line O on the reference irradiation surface R is 13.79 mm, and is disposed on the center line O. The line width LW of the ultraviolet light emitted from the third LED unit 300b at the position of -6° on the reference irradiation surface R is 12.01 mm.

Fig. 6 is a simulation result of the light amount distribution (beam profile) of each wavelength of the ultraviolet light emitted from the light irradiation device 1 of the present embodiment. That is, FIG. 6 discloses the length of the light irradiation device 1 on the X-Y plane. The light amount distribution in the Y-axis direction at the center position in the side direction (that is, the 1/2 position of the ultraviolet light line length LL (the length in the X-axis direction)), and the respective distributions (wavelengths) are respectively revealed from the first LED unit 100a, The light amount distribution of ultraviolet light having a wavelength of 365 nm emitted from 100b, the light amount distribution of ultraviolet light having a wavelength of 385 nm emitted from the second LED units 200a and 200b, and the light amount distribution of ultraviolet light having a wavelength of 405 nm emitted from the third LED units 300a and 300b. In addition, in FIG. 6, the intensity of the ultraviolet light of each wavelength becomes 1 and it is easy to compare the light quantity distribution of each wavelength, and the vertical axis is revealed as a relative intensity.

As shown in FIG. 6, when the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are arranged as shown in FIG. 5, the ultraviolet light emitted from the second LED units 200a and 200b is used as a reference. The line width LW on the irradiation surface R is different, and the line width LW of the ultraviolet light emitted from the third LED units 300a and 300b on the reference irradiation surface R is different, but the light amount distribution of each wavelength (that is, the wavelength 385 nm) And the light amount distribution at 405 nm is slightly consistent with the light amount distribution at a wavelength of 365 nm.

As described above, in the present embodiment, the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are arranged at a predetermined angle in the circumferential direction around the condensing position F1. The arrangement is such that the line width LW of the ultraviolet light of each wavelength on the reference irradiation surface R converges within a predetermined range, and the three linear ultraviolet light beams having different wavelengths have a slightly similar light amount distribution on the object to be irradiated. . Therefore, according to the light irradiation device 1 of the present embodiment, Various ultraviolet curable inks or ultraviolet curable resins having different hardening wavelengths are stabilized (that is, the hardened state does not cause unevenness) hardening.

Furthermore, in the present embodiment, the angle between the first LED units 100a and 100b, the angle between the second LED units 200a and 200b, and the angle between the third LED units 300a and 300b are aligned, respectively. Though it is configured to be 36°, the configuration is not limited to this configuration, and the first LED units 100a and 100b and the first LED unit 100a and 100b can be changed in a range in which three linear ultraviolet light beams having different wavelengths have a similar light amount distribution on the object to be irradiated. The arrangement of the 2 LED units 200a and 200b and the third LED units 300a and 300b. For the range of the light quantity distribution (that is, the condition) of the three linear ultraviolet light beams having different wavelengths, the first LED units 100a and 100b and the second LED units 200a and 200b and the second LED unit can be simulated by the simulation experiment. The relationship between the arrangement of the three LED units 300a and 300b and the light amount distribution is obtained. 7 to 14 are diagrams for explaining a simulation experiment of the light amount distribution performed by the inventors.

FIG. 7 is a view for explaining the relationship between the arrangement of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b and the light amount distribution. Fig. 7(a) is a view showing a light path of ultraviolet light emitted from the first LED units 100a and 100b, and Fig. 7(b) is a view showing a light path of ultraviolet light emitted from the second LED units 200a and 200b, and Fig. 7(c) The light path diagram of the ultraviolet light emitted from the third LED units 300a and 300b is disclosed. In addition, in FIG. 7, as in the case of FIG. 5, for the convenience of description, the ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b is exposed. Shown as parallel light.

As shown in FIGS. 7( a ) to 7 ( c ), in the simulation experiment, the first LED units 100 a and 100 b are respectively arranged on an arc of a circumference having a radius of 125 mm centering on the condensing position F1 with respect to the center line. O, ±18° position (Fig. 7(a)), the second LED unit 200a and the third LED unit 300b are disposed at positions of +6° and -6° with respect to the center line O, and the second LED unit 200b is placed. The third LED unit 300a is disposed at a position where the light amount is distributed at a position with respect to the center line O, -A°, and +A° (A is a variable).

In the case where the second LED unit 200b and the third LED unit 300a are disposed at positions of ±35° with respect to the center line O, the light amount distribution of each wavelength of the ultraviolet light emitted from the light irradiation device 1 is the same as that of FIG. The light amount distribution in the Y-axis direction at the center position in the longitudinal direction of the light irradiation device 1 (that is, the 1/2 position of the line length LL (length in the X-axis direction) of the ultraviolet light) on the XY plane is revealed. In the same manner, FIG. 9 is a light quantity distribution of each wavelength of the ultraviolet light emitted from the light irradiation device 1 when the second LED unit 200b and the third LED unit 300a are disposed at positions of ±40° with respect to the center line O. FIG. 10 is a light quantity distribution of each wavelength of the ultraviolet light emitted from the light irradiation device 1 when the second LED unit 200b and the third LED unit 300a are disposed at positions of ±45° with respect to the center line O. FIG. 11 is a light quantity distribution of each wavelength of the ultraviolet light emitted from the light irradiation device 1 when the second LED unit 200b and the third LED unit 300a are disposed at positions of ±50° with respect to the center line O. FIG. 12 is a view in which the second LED unit 200b and the third LED unit 300a are respectively arranged in relation to When the center line O is at a position of ±55°, the light amount distribution of each wavelength of the ultraviolet light emitted from the light irradiation device 1 is distributed. FIG. 13 is a light quantity distribution of each wavelength of the ultraviolet light emitted from the light irradiation device 1 when the second LED unit 200b and the third LED unit 300a are disposed at positions of ±60° with respect to the center line O. In the same manner as in FIG. 6, the peak intensity of the ultraviolet light of each wavelength is set to 1, and the light quantity distribution of each wavelength is easily normalized, and the vertical axis is revealed as the relative intensity.

As shown in FIG. 8 to FIG. 13 , when the arrangement angle of the second LED unit 200b and the third LED unit 300a is gradually increased with respect to the center line O (that is, when the incident angle to the reference irradiation surface R is gradually increased) The line width LW on the reference irradiation surface R becomes thicker, and the difference in the incident angle with the ultraviolet light emitted from the first LED units 100a and 100b becomes larger. Therefore, the light amount distribution at the wavelengths of 385 nm and 405 nm is particularly distributed when the second LED unit 200b and the third LED unit 300a are disposed at a position of ±45° or more with respect to the center line O (about ±10 mm). In the middle, it is a deviation from the light amount distribution at a wavelength of 365 nm (Figs. 10 to 13). In the present embodiment, the light amount distribution at a wavelength of 365 nm is the sum of the ultraviolet light emitted from the first LED units 100a and 100b, and the light amount distribution at a wavelength of 385 nm is the sum of the ultraviolet light emitted from the second LED units 200a and 200b. The light amount distribution at 405 nm is the sum of the ultraviolet light emitted from the third LED units 300a and 300b, and the light amount distribution at a wavelength of 365 nm is determined based on the sum of the line widths LW on the irradiation surface R on the basis of the first LED units 100a and 100b. The sum of the line widths LW on the irradiation surface R of the reference of the two LED units 200a and 200b, The light amount distribution at a wavelength of 385 nm is determined, and the light amount distribution at a wavelength of 405 nm is determined based on the sum of the line widths LW on the irradiation surface R on the basis of the third LED units 300a and 300b. That is, in order to make the light amount distribution of the ultraviolet light of each wavelength slightly equal, the condition is that the sum of the line widths LW (that is, the beam diameters) on the irradiation surface R of the reference of the ultraviolet light of each wavelength is respectively determined. range.

Therefore, the results of the simulation experiment were reviewed by using the sum of the line widths LW on the irradiation surface R of the reference of the ultraviolet light of each wavelength as a kind of comparison parameter. The beam diameter of the ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b (that is, the beam diameter in the Y-axis direction when the incident angle is 0°) is defined as " 1), when the incident angles of the ultraviolet light emitted from the first LED units 100a and 100b with respect to the reference irradiation surface R are θ _1a and θ _1b , respectively, the line width on the irradiation surface R of the reference of the ultraviolet light having a wavelength of 365 nm LW and α ₀ can be represented by the following calculation formula.

In addition, when the incident angles of the ultraviolet light emitted from the second LED units 200a and 200b (or the third LED units 300a and 300b) to the reference irradiation surface R are θ _2a and θ _2b , respectively, the wavelength is 385 nm (or 405 nm). The sum α ₁ of the line width LW on the irradiation surface R of the reference of the ultraviolet light can be expressed by the following calculation formula.

Then, the line width LW is irradiated on the reference surface R on the line width LW of the irradiated surface R of the reference wavelength of 365nm ultraviolet light and α _0, with a wavelength of 385 nm (or a wavelength of 405 nm) of ultraviolet light and α ₁ The difference is set to β and can be defined by the following calculation formula. In other words, the β system indicates an index indicating the fluctuation range of the line width LW based on the arrangement of the first LED units 100a. and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b.

[Number 4] β = α ₀ - α ₁

Table 1 is a table showing the relationship between the light amount distribution shown in Fig. 6 and Figs. 8 to 13 and β. In Table 1, angle A discloses the arrangement angle of the second LED unit 200b and the third LED unit 300a. The angle A=30° corresponds to FIG. 6, and the angle A=35° to 60° corresponds to FIG. 8 to FIG. 13 respectively. Further, in Table 1, in the range of ±30 mm (horizontal axis) of γ, the difference between the distribution of the wavelength of 365 nm and the distribution of the wavelength of 385 nm in each graph was obtained, and the value of the root mean square ("385 nm" in Table 1) was The range of ±30 mm (horizontal axis) was obtained as the difference between the distribution of the wavelength of 365 nm and the distribution of the wavelength of 405 nm in each graph, and the value of the root mean square ("405 nm" in Table 1). That is, the γ system indicates an index of the distribution of the wavelength of 385 nm with respect to the distribution of the wavelength of 365 nm and the degree of matching of the distribution of the wavelength of 405 nm. Further, β is based on the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED in each drawing. The arrangement of the units 300a, 300b, the value of the aforementioned β obtained. Further, the "determination" in Table 1 is based on the viewpoint of the characteristics of the ultraviolet curable ink and the ultraviolet curable resin, and whether the light amount distribution of the ultraviolet light of each wavelength in each graph can be said to be slightly equal. "○" indicates a situation in which the light amount distribution is slightly equal, "X" indicates that the light amount distribution is not slightly equal, and "△" indicates that the light amount distribution is slightly equal.

Fig. 14 is a graph showing the relationship between β and γ in Table 1. As can be seen from Table 1 and Figure 14, as the value of β becomes larger, the value of γ also becomes larger. Then, it can be seen that when γ is about 0.03 (that is, when the angle A is 40°), the uniformity of the light amount distribution of the ultraviolet light of each wavelength is remarkably deteriorated. In other words, as a condition for making the light amount distribution of the ultraviolet light of each wavelength slightly equal, at least the value of β is required to be 0.21 or less (that is, the angle A ≦ 40°), and the following calculation formula holds.

Further, as shown in Table 1, it is more preferable that the value of β is 0.12 or less (that is, the angle A ≦ 35°).

The above is the description of the embodiment, but the present invention is not limited to the above-described configuration, and various modifications can be made without departing from the spirit and scope of the invention.

In the present embodiment, the first LED units 100a and 100b are disposed at positions of ±18° with respect to the center line O, and the second LED units 200a and 200b are disposed on the center line O, +6°, -30, respectively. At the position of °, the third LED units 300a and 300b are disposed at positions of +30° and -6° with respect to the center line O. However, the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED unit 300a are disposed. 300b can be exchanged and configured. Furthermore, in general, the more the LED that emits light of a short wavelength, the worse the efficiency (that is, the luminous intensity with respect to the consumed power), so the first LED must be used in order to suppress the power consumption and suppress the heat generation. The output of units 100a, 100b is suppressed as low as possible. Therefore, in the present embodiment, the first LED units 100a and 100b including the LEDs that emit the light having the shortest wavelength are arranged in line symmetry with the center line O as the symmetry axis, and the line width on the reference irradiation surface R is made. It is preferable that the LW is not expanded as much as possible (that is, the manner in which the amount of light per unit area does not decrease).

Further, in the present embodiment, the ultraviolet light having three different wavelengths is irradiated. However, the present invention is not limited to such a structure, and the present invention is also applicable to the irradiation of N types (N is an integer of 2 or more). A light irradiation device of ultraviolet light of different wavelengths. Further, in the present embodiment, the two first LED units 100a and 100b emit ultraviolet light having a wavelength of 365 nm, and the two second LED units 200a and 200b emit purple at a wavelength of 385 nm. In the external light, the two third LED units 300a and 300b emit ultraviolet light having a wavelength of 405 nm. However, the number of LED units that emit ultraviolet light of each wavelength may be one or three or more. That is, the LED unit 50 can be configured by N × M (M is an integer of 1 or more) LED units.

In this case, in order to make the light amount distribution of the ultraviolet light of each wavelength slightly equal, the conditions are 2 and 3, and the following conditional expressions are satisfied. In other words, in the ultraviolet light of different wavelengths of the N type (N is an integer of 2 or more), the incident angle of the ultraviolet light of any wavelength with respect to the reference irradiation surface R is θ _i (i is 1 to M). The integer is obtained by shooting the sum of the line widths LW of the light of any wavelength on the reference irradiation surface R as α ₀ , and setting the respective incident angles of the ultraviolet light of the other wavelengths to the reference irradiation surface R as θ _k ( k is an integer from 1 to M), and the sum of the line widths LW of the ultraviolet light of other wavelengths on the reference irradiation surface R is α ₁ , and when the difference between α ₀ and α ₁ is β, the following must be satisfied Conditional formula.

Further, in the present embodiment, the intensity of the ultraviolet light of each wavelength is set to 1, and it is easy to compare the light amount distribution of each wavelength. In the normalization, the peak intensity of the ultraviolet light of each wavelength may be configured to be different depending on the sensitivity of the object to be irradiated.

(Second embodiment)

FIG. 15 is a view showing the structures of the first LED units 100aA and 100bA, the second LED units 200aA and 200bA, and the third LED units 300aA and 300bA included in the light irradiation device 2 according to the second embodiment of the present invention. In the first LED units 100aA and 100bA, the second LED units 200aA and 200bA, and the third LED units 300aA and 300bA of the present embodiment, the LED module 110 is densely arranged in a zigzag shape (that is, one column × 20 squares). The LED module 110 is different from the light irradiation device 1 of the first embodiment in that the LED module 110 is shifted from the other one of the LED modules 110 of one column to the other by a distance of 1/2 of the distance P.

When the LED module 110 is disposed as described above, the linear ultraviolet light emitted from the first LED units 100aA and 100bA, the second LED units 200aA and 200bA, and the third LED units 300aA and 300bA is relatively biased only in the X-axis direction. The distance 1/2 of the interval P of the LED module 110 is set. Therefore, in the same manner as in the first embodiment, each of the linear ultraviolet light beams cancels a portion where the light amount distribution is low, and a slightly uniform light amount distribution is formed in the X-axis direction on the object to be irradiated. According to the structure of the present embodiment, the light-emitting device 1 of the first embodiment does not require the first LED unit 100a, the second LED unit 200a, and the third LED unit 300a to be in the first LED unit 100b, the second LED unit 200b, and the third LED unit 300b. To offset the configuration, the security of the base blocks 20 can be simplified. Install position adjustment, etc.

(Third embodiment)

FIG. 16 is a view showing a mounting structure of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b included in the light irradiation device 3 according to the third embodiment of the present invention. The light irradiation device 3 of the present embodiment is provided with a base block 20M for fixing the mounting inclined faces 20Ma to 20Mf of the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b. The light irradiation device 1 of the first embodiment is different from the base block 20 of the first embodiment having a partial cylindrical surface. The mounting inclined surfaces 20Ma to 20Mf of the present embodiment are irradiated with ultraviolet light emitted from the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b at the same incident angle as in the first embodiment. It is formed in such a manner as to enter the reference irradiation surface R. In other words, the 20Mb and 20Me of the first LED units 100a and 100b of the present embodiment are incident on the reference irradiation surface R at an incident angle of ±18° by the ultraviolet light emitted from the first LED units 100a and 100b. The condensing position F1 is constructed. Further, 20Ma and 20Md of the second LED units 200a and 200b of the present embodiment are fixed so that the ultraviolet light emitted from the second LED units 200a and 200b is incident on the reference at an incident angle of +6° and -30°. The condensing position F1 on the surface R is configured. Further, 20Mc and 20Mf of the third LED units 300a and 300b of the present embodiment are fixed so that the ultraviolet light emitted from the third LED units 300a and 300b is incident at an incident angle of +30° and -6°. The condensing position F1 on the irradiation surface R of the reference is configured.

As described above, when the mounting inclined surfaces 20Ma to 20Mf for fixing the first LED units 100a and 100b, the second LED units 200a and 200b, and the third LED units 300a and 300b are formed in the base block 20M, the first LED units 100a and 100b can be used. The second LED units 200a and 200b and the third LED units 300a and 300b are accurately mounted to the base block 20M, and adjustment of the mounting angles is not required.

Furthermore, the embodiments disclosed herein are all illustrative and are not intended to limit the invention. The scope of the present invention is not limited by the foregoing description, and all modifications within the scope and scope of the invention are intended to be

10‧‧‧shell

50‧‧‧LED unit

100a, 100b‧‧‧1st LED unit

101‧‧‧Substrate

110,210,310‧‧‧LED modules

111,211,311‧‧‧LED components

113,115‧‧‧ lens

200a, 200b‧‧‧2nd LED unit

300a, 300b‧‧‧3rd LED unit

CL1‧‧‧ center line

LW‧‧‧ line width

P‧‧‧ interval

F1‧‧‧ spotlight position

Claims (20)

A light irradiation device that irradiates a predetermined irradiation position on an irradiation surface, and irradiates a light irradiation device that extends in a first direction and has a linear light having a predetermined line width in a second direction orthogonal to the first direction. The optical unit includes a plurality of optical units, wherein the optical unit has a plurality of light sources arranged on the substrate at a predetermined interval along the first direction, and the optical axes are aligned in a direction orthogonal to the substrate surface. And a plurality of optical elements shaped to be slightly parallel light, and light rays linearly parallel to the first direction are emitted from the light-emitting paths arranged in the respective light sources The plurality of optical units are formed by optical units that emit N×M (M is an integer of 2 or more) of light of different wavelengths of N types (N is an integer of 2 or more); the aforementioned N×M optical units When viewed from the first direction, the light paths of the light beams of different wavelengths of the N types are arranged in a predetermined order in the circumferential direction around the irradiation position, and are emitted from the N×M optical units. The light beams of the respective wavelengths are arranged so that the ranges in the second direction are within the predetermined line width, and the N×M optical units are different wavelengths of the N types when viewed from the first direction. In the light of the light, the light path of the light of any wavelength is arranged in a line symmetry with the perpendicular line of the irradiation position as the axis of symmetry; and the incident angle of the light of any one of the aforementioned wavelengths is set to θ _i for the irradiation surface. (i is an integer from 1 to M), the sum of the range in which the light of any one of the wavelengths is irradiated to the second direction is α ₀ , and the respective incident angles of the light rays of the other wavelengths to the irradiation surface are set to θ _k (k is an integer from 1 to M), the total of the range in which the light of the other wavelength is irradiated to the second direction is α ₁ , and when the predetermined value is β, the following conditional expression is satisfied. The light irradiation device according to claim 1, wherein the light of any one of the wavelengths is the light having the shortest wavelength among the light beams of different wavelengths of the N types. The light-irradiating device according to the first or second aspect of the invention, wherein the optical unit is linearly symmetrical when the vertical line of the irradiation position is an axis of symmetry when viewed from the first direction. Configuration. The light irradiation device according to the third aspect of the invention, wherein the optical unit is disposed on an arc centered on the irradiation position when viewed from the first direction. The light irradiation device according to the first or second aspect of the invention, wherein the M is an even number, and the M/2 optical units that emit light of different wavelengths of the N types in the N×M optical units For the other M/2 optical units, the first direction is shifted by a distance of 1/2 of the predetermined interval. The light irradiation device according to claim 3, wherein the M is an even number, and the M/2 optical units that emit light of different wavelengths of the N types in the N×M optical units are other The M/2 optical units are disposed only by a distance of 1/2 of the predetermined interval from the first direction. The light irradiation device according to claim 4, wherein the M is an even number; and in the N×M optical units, M/2 optical units that emit light of different wavelengths of the N types are used for other The M/2 optical units are disposed only by a distance of 1/2 of the predetermined interval from the first direction. The light irradiation device according to the first or second aspect of the invention, wherein the plurality of light sources are arranged on the substrate and divided into two rows. In a direction orthogonal to the first direction, when viewed from the first direction, light rays emitted from one of the light sources and light rays emitted from the other of the light sources are collected at the irradiation position. The optical axes of the respective optical elements are shifted from the optical axes of the respective light sources. The light-emitting device according to the third aspect of the invention, wherein the plurality of light sources are arranged on the substrate in two rows and arranged in a direction orthogonal to the first direction, and from the first direction At the time of observation, the light beams emitted from the light sources of one of the rows and the light beams emitted from the other of the light sources are collected at the irradiation position, and the optical axes of the optical elements are shifted from the optical axes of the respective light sources. The light irradiation device according to the fourth aspect of the invention, wherein the plurality of light sources are arranged on the substrate in two rows and arranged in a direction orthogonal to the first direction, and in a direction from the first direction At the time of observation, the light beams emitted from the light sources of one of the rows and the light beams emitted from the other of the light sources are collected at the irradiation position, and the optical axes of the optical elements are shifted from the optical axes of the respective light sources. The light irradiation device according to the fifth aspect of the invention, wherein the plurality of light sources are arranged on the substrate in two rows and arranged in a direction orthogonal to the first direction, and from the first direction When observing, the light emitted from the light source of one of the columns and the light emitted from the light source of the other row are collected at the irradiation position, so that the optical elements are The optical axis of the piece is offset from the optical axis of each source. The light irradiation device according to the sixth aspect of the invention, wherein the plurality of light sources are arranged on the substrate in two rows and arranged in a direction orthogonal to the first direction, and from the first direction At the time of observation, the light beams emitted from the light sources of one of the rows and the light beams emitted from the other of the light sources are collected at the irradiation position, and the optical axes of the optical elements are shifted from the optical axes of the respective light sources. The light irradiation device according to claim 7, wherein the plurality of light sources are arranged on the substrate in two rows and arranged in a direction orthogonal to the first direction, and from the first direction At the time of observation, the light beams emitted from the light sources of one of the rows and the light beams emitted from the other of the light sources are collected at the irradiation position, and the optical axes of the optical elements are shifted from the optical axes of the respective light sources. The light-emitting device according to claim 8, wherein the light source of the one of the other ones is arranged such that the light source of the other one of the distances is shifted by a distance of 1/2 of the predetermined interval from the first direction. . The light-emitting device according to claim 9, wherein the light source of the one of the other ones is arranged such that the light source of the other one of the distances deviates from the first interval by a distance of 1/2 of the predetermined interval. Set. The light-irradiating device according to claim 10, wherein the light source of the one of the other ones is arranged such that the light source of the other of the first rows is shifted by a distance of 1/2 of the predetermined interval from the first direction. . The light-emitting device according to claim 11, wherein the light source of the one of the other ones is disposed at a distance of 1/2 of the predetermined interval from the light source of the other of the first rows. . The light-emitting device according to claim 12, wherein the one of the light sources of the other one of the light sources is disposed at a distance of 1/2 of the predetermined interval from the first direction. . The light-emitting device according to the first or second aspect of the invention, wherein the plurality of light sources are surface-emitting LEDs having a light-emitting surface having a substantially square shape, and a diagonal line of one of the light-emitting surfaces and the first The 1 direction is arranged in parallel. The light irradiation device according to the first or second aspect of the invention, wherein the light of different wavelengths of the N types is set for each wavelength Different strength.