JP7199649B2 - Light source device for fluid sterilizer and fluid sterilizer - Google Patents

Description

The present invention relates to a light source device for a fluid sterilizer and a fluid sterilizer.

2. Description of the Related Art Conventionally, a light source device in which a plurality of light emitting diodes are arranged on a plane is known (see, for example, Patent Document 1). For example, a light source device using a light-emitting diode that emits ultraviolet light is used in a fluid sterilization device that sterilizes fluid such as water (inactivates bacteria) and a resin curing device that cures ultraviolet curable resin.

Japanese Patent No. 5732157

In the light source device used in the fluid sterilizer described above, for example, in order to perform sterilization without omission, it is sometimes desired to irradiate the light from the light-emitting diodes with uniform light.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a light source device for a fluid sterilizer and a fluid sterilizer capable of improving the uniformity of the amount of light on an irradiation surface.

In order to solve the above-mentioned problems, the present invention provides a light source device for a fluid sterilizer that is used in a fluid sterilizer that sterilizes fluid by irradiating ultraviolet light, the light source device being equipped with a plurality of light emitting diodes that irradiate ultraviolet light. arranged on a plane, the light distribution angle of each of the light emitting diodes is less than 50° or greater than 80°, the mounting surface is a plane, and a predetermined center axis is perpendicular to the plane a radial light source region having the plurality of aligned light emitting diodes;
In a virtual irradiation plane parallel to the plane and irradiated with light from each light emitting diode, at least the value obtained by dividing the distance from the central axis by the radius of the light source region is −0.9. Provided is a light source device for a fluid sterilizer in which the amount of light is 60% or more of the peak value within the range of 0.9 or less .
Further, in order to solve the above problems, the present invention has a light distribution angle of less than 50 ° or greater than 80 °, and includes a light source device including a plurality of light emitting diodes that emit ultraviolet light,
The light source device is configured to sterilize a fluid by irradiating the ultraviolet light, and the light source device has a flat surface on which the light emitting diodes are mounted, and a light source area having a predetermined radius around a central axis perpendicular to the flat surface is , in a virtual irradiation plane which has the plurality of light emitting diodes arranged in alignment and which is a plane parallel to the plane and onto which the light from each light emitting diode is irradiated, at least the distance from the central axis is Provided is a fluid sterilizer in which the value divided by the radius of the light source region is in the range of -0.9 or more and 0.9 or less, and the amount of light is 60% or more of the peak value .

According to the present invention, it is possible to improve the uniformity of the amount of light on the irradiation surface.

1 is a schematic configuration diagram of a light source device for a fluid sterilizer according to an embodiment of the present invention; FIG. (a) and (b) are graphs showing the relationship between the relative luminous intensity of a light emitting diode with a light distribution angle of 20° and the angle; (c) and (d) are graphs showing the relative luminous intensity of a light emitting diode with a light distribution angle of 20° is a graph showing the relationship between and the angle. (a) is a diagram showing the arrangement of light-emitting diodes, and (b) to (d) are diagrams showing simulation results of the light amount distribution for each light distribution angle. FIG. 4 is a graph showing the relationship between the distance from the center where the amount of light is 60% or 80% of the peak value and the light distribution angle. (a) to (e) are diagrams showing simulation results of the light amount distribution when the optical distance from the light emitting diode to the irradiation surface is changed when the light distribution angle is 20°. 5(a) to 5(e) are graphs showing light quantity distributions in cross sections passing through the central axis in each of FIGS. 5(a) to 5(e). FIG. 10 is a graph showing the relationship between the distance from the center where the light intensity is 60% or 80% of the peak value and the optical distance from the light emitting diode to the irradiation surface when the light distribution angle is 20°. (a) to (e) are diagrams showing simulation results of the light amount distribution when the optical distance from the light emitting diode to the irradiation surface is changed when the light distribution angle is 140°. 8(a) to 8(e) are graphs showing light amount distributions in cross sections passing through the central axis in each of FIGS. 8(a) to 8(e). FIG. 5 is a graph showing the relationship between the distance from the center where the amount of light is 60% or 80% of the peak value and the optical distance from the light emitting diode to the irradiation surface when the light distribution angle is 140°. (a) to (e) are diagrams for explaining the arrangement of each light-emitting diode when the LED pitch is changed. (a) to (e) are diagrams showing simulation results of the light amount distribution when the LED pitch is changed when the light distribution angle is 20°. 12(a) to 12(e) are graphs showing light amount distributions in cross sections passing through the central axis in each of FIGS. 12(a) to 12(e). (a) is a graph showing the relationship between the LED pitch and the distance from the center where the light intensity is 60% or 80% of the peak value when the light distribution angle is 20 °; , and a graph showing the relationship between the LED pitch and the in-plane light amount distribution ratio. (a) to (e) are diagrams showing simulation results of the light amount distribution when the LED pitch is changed when the light distribution angle is 140°. 15A to 15E are graphs showing light amount distributions in cross sections passing through the central axis in FIGS. 15A to 15E, respectively. (a) is a graph showing the relationship between the LED pitch and the distance from the center where the light intensity is 60% or 80% of the peak value when the light distribution angle is 140 °; , and a graph showing the relationship between the LED pitch and the in-plane light quantity distribution ratio. (a) to (g) are diagrams for explaining the arrangement of each light-emitting diode when the number of light-emitting diodes used is changed. (a) is a graph showing simulation results of the light intensity distribution in a cross section passing through the central axis when the light distribution angle is 20°; It is a graph diagram normalized by radius. (a) is a graph showing simulation results of the light intensity distribution in a cross section passing through the central axis when the light distribution angle is 140°; It is a graph diagram normalized by radius.

[Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of a fluid sterilization device (hereinafter referred to as a light source device) according to this embodiment. As shown in FIG. 1, the light source device 1 is a device in which a plurality of light emitting diodes 2 are arranged on a plane.

Here, as the light-emitting diode 2, a resin-sealed light-emitting diode chip is used, but the specific configuration of the light-emitting diode 2 is not particularly limited. For example, the light-emitting diode 2 may be a hollow package in which a light-emitting diode chip is covered with a glass or the like, or may be a chip-on-board system in which the chip is not covered. . Also, the emission wavelength of the light emitting diode 2 is not particularly limited.

The plurality of light emitting diodes 2 are arranged at equal intervals in the circumferential and radial directions around a central axis C perpendicular to the plane on which the plurality of light emitting diodes 2 are arranged. Hereinafter, the arrangement pitch of the light emitting diodes in the radial direction will be referred to as the LED pitch. The specific number of light-emitting diodes 2, suitable arrangement pitch, etc. will be discussed later.

It is also assumed that the irradiation surface 3 onto which the light from the light source device 1 is irradiated is parallel to the plane on which the plurality of light emitting diodes 2 are arranged. Hereinafter, let D be an optical distance from each light emitting diode 2 to the irradiation surface 3 along the direction perpendicular to the plane (the direction perpendicular to the irradiation surface 3). The optical distance is expressed by D=d×n, where d is the distance along the path that light travels, and n is the refractive index of the medium through which the light travels. The object irradiated with the light from the light source device 1 may be either gas or liquid.

(Examination of suitable light distribution angle)
In the light source device 1 according to this embodiment, the light distribution angle of each light emitting diode 2 is set to be less than 50° or greater than 80°. The reason for this will be explained below.

The light distribution angle is also called a directivity angle, and is an angular range in which the light intensity (light quantity) of the light emitting diode 2 is half or more of the peak value or maximum value. The light distribution angle is measured by moving the light receiver while maintaining a constant distance from the light emitting diode 2 and measuring the light intensity at each angle. For example, as shown in FIGS. 2A and 2B, in the light emitting diode 2 with a light distribution angle of 20°, when the front of the light emitting diode 2 is 0°, the angle range of plus or minus 10° is the peak value It is a region where the light intensity of more than half of is obtained. Similarly, as shown in FIGS. 2(c) and 2(d), in the light emitting diode 2 with a light distribution angle of 140°, when the front of the light emitting diode 2 is 0°, the angle range of plus or minus 70° is the maximum. This is the area where the light intensity of half or more of the value can be obtained. In this specification, the peak value represents the light intensity at the front (0°), and the maximum value represents the maximum light intensity.

In addition, in the light-emitting diode 2, means for adjusting the light distribution angle is not particularly limited. For example, it may have a reflecting mechanism such as a concave mirror-shaped reflector, or may have a transmissive focusing mechanism such as a lens. In the simulation below, it is assumed that all the light emitting diodes 2 have the same light distribution angle, but some errors due to manufacturing tolerances and the like are allowed.

Hereinafter, as shown in FIG. 3A, one light emitting diode 2 is arranged in the center, the LED pitch (arrangement pitch in the radial direction) is 10 mm, and the light emitting diode 2 is arranged in a range of 60 mm in diameter. think about. 6 on a circle with a diameter of 10 mm, 12 on a circle with a diameter of 20 mm, 18 on a circle with a diameter of 30 mm, 24 on a circle with a diameter of 40 mm, and on a circle with a diameter of 50 mm There are 30 light emitting diodes 2 on the circumference of 60 mm in diameter, and 36 light emitting diodes 2 on the circumference of 60 mm in diameter. The radius of the light source region, that is, the radius of the region where the light emitting diodes 2 are arranged is 60 mm.

In the case where the light-emitting diodes 2 are arranged as shown in FIG. 3A, the light intensity distribution on the irradiation surface 3 is simulated by changing the light distribution angle of each light-emitting diode 2 . 3B to 3D show the light amount distributions on the irradiation surface when the light distribution angles are 20°, 50°, and 140°. 3B to 3D show graphs of the distribution of the amount of light in a cross section passing through the central axis C together with graphs showing the three-dimensional distribution of the amount of light. The optical distance D between the light emitting diode 2 and the irradiation surface 3 was set to 100 mm. The simulation was performed on the assumption that the brightness of one light-emitting diode 2 (total amount of light emitted) is constant even when the light distribution angle is changed. FIG. 4 summarizes the calculation results for each light distribution angle.

Here, an index for evaluating the uniformity of the light amount distribution on the irradiation surface 3 will be explained. In applications that require uniformity of the light source, such as water sterilization (fluid sterilization), increasing the light output of the ultraviolet light not only improves the sterilization performance (effective performance) in response to the increase in light output, but also By increasing the area (depth) irradiated with light, the improvement is more than the increase in the light output. Therefore, in order to obtain 67% uniformity of effect performance (within 1.5 times the uniformity of light intensity), the light source must have at least 80% uniformity, and 50% uniformity of effect performance ( In order to obtain the uniformity of the amount of light (within 2.0 times), the uniformity of at least 60% or more is required for the light source.

Therefore, in the present embodiment, as indices for evaluating the uniformity of the light intensity distribution on the irradiation surface 3, "the distance from the center where the light intensity is 80% of the peak value" and "the distance from the center where the light intensity is 60% of the peak value" are used. The distance from the center where The “center” here means the center of the area where the light-emitting diodes 2 are arranged, that is, the position of the central axis C. As shown in FIG. As these distance values are larger, a wider range of the irradiation surface 3 is uniformly irradiated, and good uniformity of the amount of light is obtained on the irradiation surface 3 .

As shown in FIG. 4, good results are obtained for areas where the light distribution angle is small and areas where the light distribution angle is large. However, in the intermediate regions, that is, when the light distribution angles are 50°, 60°, and 80°, “the distance from the center where the light intensity is 80% of the peak value” and “the distance from the center where the light intensity is 60% of the peak value” %" decreases, and the uniformity of the light amount on the irradiation surface 3 decreases.

In the present embodiment, when the radius of the light source region is 60 mm, and "the distance from the center where the light amount is 80% of the peak value" is 44 mm or more, the uniformity of the light amount on the irradiation surface 3 passes. Suppose that As shown in FIG. 4, when the light distribution angle is less than 50° or greater than 80°, the “distance from the center where the light intensity is 80% of the peak value” is 44 mm or more, and the light intensity on the irradiation surface 3 is uniform. sexuality is improving. Therefore, in the light source device 1 according to the present embodiment, the light distribution angle of each light emitting diode 2 is set to be less than 50° or greater than 80°.

Also, from the graph in FIG. 4, when "the distance from the center where the light intensity is 80% of the peak value" is 44 mm or more, "the distance from the center where the light intensity is 60% of the peak value" is the light distribution angle A region of less than 50° corresponds to 58 mm or more, and a region of more than 80° corresponds to 60 mm or more. Therefore, when the light distribution angle is less than 50°, the “distance from the center where the light amount is 60% of the peak value” is 58 mm or more, and when the light distribution angle is greater than 80°, the “light amount The criterion for acceptance was that the "distance from the center where is 60% of the peak value" was 60 mm or more.

(Examination of optical distance D between light emitting diode 2 and irradiation surface 3)
First, when the light distribution angle of the light emitting diode 2 is less than 50°, a suitable optical distance D will be examined. The light intensity distribution on the irradiation surface 3 is simulated when the light distribution angle of the light emitting diode 2 is 20° and the optical distance D between the light emitting diode 2 and the irradiation surface 3 is 50 mm, 80 mm, 100 mm, 150 mm, and 200 mm. asked. The simulation results are shown in FIGS. 5(a) to 5(e). 6(a) to 6(e) show light amount distributions in cross sections passing through the central axis C in each case.

Also, from FIGS. 6A to 6E, the results of calculating "the distance from the center where the light intensity is 60% of the peak value" and "the distance from the center where the light intensity is 80% of the peak value" are calculated. , are summarized in FIG. As shown in FIG. 7, "the distance from the center where the amount of light is 60% of the peak value" is 58 mm or more, which is the acceptance criterion, in any case. In addition, as shown in FIG. 7, the "distance from the center where the amount of light is 80% of the peak value" is also 44 mm or more, which is the acceptance criterion. However, from the tendency of FIG. 7, "the distance from the center where the light intensity is 60% of the peak value" and "the distance from the center where the light intensity is 80% of the peak value" increase as the optical distance D increases. If the optical distance D exceeds 200 mm, it is considered to be below the acceptance criteria.

Therefore, when the light distribution angle of each light emitting diode 2 is less than 50°, the optical distance D from each light emitting diode 2 to the irradiation surface 3 is preferably 200 mm or less.

Next, a suitable optical distance D will be examined when the light distribution angle of the light emitting diode 2 is made larger than 80°. The light intensity distribution on the irradiation surface 3 is simulated when the light distribution angle of the light emitting diode 2 is 140° and the optical distance D between the light emitting diode 2 and the irradiation surface 3 is 50 mm, 80 mm, 100 mm, 150 mm, and 200 mm. asked. The simulation results are shown in FIGS. 8(a)-(e). 9(a) to 9(e) show light amount distributions in cross sections passing through the central axis C in each case.

Further, from FIGS. 9A to 9E, the results of calculating "the distance from the center where the light intensity is 60% of the peak value" and "the distance from the center where the light intensity is 80% of the peak value" are calculated. , are summarized in FIG. As shown in FIG. 10, "the distance from the center where the amount of light is 60% of the peak value" and "the distance from the center where the amount of light is 80% of the peak value" are the same when the optical distance D is 50 mm. It has become a failure, and has become a pass when the optical distance D is 80 mm or more.

Therefore, when the light distribution angle of each light emitting diode 2 is greater than 80°, the optical distance D from each light emitting diode 2 to the irradiation surface 3 is preferably 80 mm or more.

(Examination of LED pitch)
Next, the LED pitch, that is, the arrangement pitch of the light emitting diodes 2 in the radial direction will be examined. Here, as shown in FIGS. 11A to 11E, the cases where the LED pitch is 8.5 mm, 10 mm, 12 mm, 15 mm, and 20 mm were examined. In each case, the area (light source area) in which the light emitting diodes 2 are arranged is fixed at a diameter of 60 mm, and the LED pitch is adjusted by increasing or decreasing the number of the arranged light emitting diodes 2 to adjust the density. The number of light-emitting diodes 2 used is 169 when the LED pitch is 8.5 mm, 127 when the LED pitch is 10 mm, 91 when the LED pitch is 12 mm, 61 when the LED pitch is 15 mm, and 37 when the LED pitch is 20 mm. be. Since the total number of light-emitting diodes 2 differs between these, the simulation was performed assuming that the total amount of light was the same.

First, the case where the light distribution angle of the light emitting diode 2 is set to less than 50° will be considered. The light amount distribution on the irradiation surface 3 was obtained by simulation when the light distribution angle of the light emitting diode 2 was 20° and the LED pitches were 8.5 mm, 10 mm, 12 mm, 15 mm, and 20 mm. Simulation results are shown in FIGS. 12(a) to 12(e). 13(a) to 13(e) show light quantity distributions in cross sections passing through the central axis C in each case.

Also, from FIGS. 13A to 13E, the results of calculating “the distance from the center where the light intensity is 60% of the peak value” and “the distance from the center where the light intensity is 80% of the peak value” are calculated. , are collectively shown in FIG. As shown in FIG. 14A, the "distance from the center where the amount of light is 60% of the peak value" is 58 mm or more, which is the acceptance criterion, in any case. In addition, as shown in FIG. 14A, the "distance from the center where the amount of light is 80% of the peak value" is also 44 mm or more, which is the acceptance criterion. Also, from the tendency of FIG. 14(a), when the LED pitch is less than 8.5 mm, it is considered that "the distance from the center where the light intensity is 60% of the peak value" falls below the acceptable value of 58 mm. Therefore, when the light distribution angle of each light emitting diode 2 is less than 50°, the LED pitch is preferably 8.5 mm or more.

Here, referring to the simulation results of FIGS. 12(a) to 12(e), it can be seen that the larger the LED pitch, the greater the variation in the amount of light within the irradiation surface 3. FIG. Therefore, in order to evaluate the variation in the amount of light, the in-plane light amount distribution ratio of the irradiated surface 3 was used as an evaluation criterion. The in-plane light quantity distribution ratio was calculated from the bottom value/peak value using the peak value and the bottom value in the light quantity drop near the peak in the light quantity distributions of FIGS. In this embodiment, the acceptance criterion is that the in-plane light amount distribution ratio is 80% (0.8) or more.

FIG. 14B collectively shows the calculation results of the in-plane light quantity distribution ratio. As shown in FIG. 14(b), when the LED pitch is 20 mm, the in-plane light quantity distribution ratio is less than 80%. Therefore, it is desirable that the LED pitch is less than 20 mm, more preferably 15 mm or less.

From the above results, when the light distribution angle of each light emitting diode 2 is less than 50°, the LED pitch is preferably 8.5 mm or more and less than 20 mm, more preferably 8.5 mm or more and 15 mm or less.

Next, a case where the light distribution angle of the light emitting diode 2 is made larger than 80° will be considered. The light amount distribution on the irradiation surface 3 was obtained by simulation when the light distribution angle of the light emitting diode 2 was 140° and the LED pitches were 8.5 mm, 10 mm, 12 mm, 15 mm, and 20 mm. Simulation results are shown in FIGS. 15(a) to 15(e). 16(a) to 16(e) show light amount distributions in cross sections passing through the central axis C in each case.

Also, from FIGS. 16A to 16E, the results of calculating “the distance from the center where the light intensity is 60% of the peak value” and “the distance from the center where the light intensity is 80% of the peak value” are calculated. , are collectively shown in FIG. As shown in FIG. 17A, the "distance from the center where the amount of light is 60% of the peak value" is 60 mm or more, which is the acceptance criterion, in any case. In addition, as shown in FIG. 17A, the "distance from the center where the amount of light is 80% of the peak value" is also 44 mm or more, which is the acceptance criterion. Also, from the tendency of FIG. 17(a), when the LED pitch is significantly below 8.5 mm, "the distance from the center where the light amount is 60% of the peak value" and "the center where the light amount is 80% of the peak value distance from” is considered to be below the acceptance value. Therefore, when the light distribution angle of each light-emitting diode 2 is greater than 80°, the LED pitch is preferably 8.5 mm or more.

In addition, the in-plane light amount distribution ratio was determined for each light amount distribution shown in FIGS. FIG. 17B collectively shows the calculation results of the in-plane light quantity distribution ratio. As shown in FIG. 17(b), in this example, good results are obtained regardless of the LED pitch. Also, from the tendency of FIG. 17(b), it is considered that the in-plane light amount distribution ratio falls below the acceptable value when the LED pitch greatly exceeds 20 mm. Therefore, it can be said that the LED pitch is preferably 20 mm or less.

From the above results, when the light distribution angle of each light emitting diode 2 is larger than 80°, the LED pitch is preferably 8.5 mm or more and 20 mm or less.

(Examination of the number of light-emitting diodes 2 to be used)
Next, a case where the LED pitch is fixed and the number of light emitting diodes 2 used is changed will be examined. Here, as shown in FIGS. 18A to 18G, the LED pitch is fixed at 10 mm, and the light emitting diodes 2 arranged in a circle around the center light emitting diode 2 are arranged one, two, three times. Cases of laps, 4 laps, 5 laps, 6 laps, and 7 laps were examined. The number of light emitting diodes 2 used is 7 for one turn, 19 for two turns, 37 for three turns, 61 for four turns, 91 for five turns, and 127 for six turns. 169 in the case of 7 rounds.

For the case where the light distribution angle is 20°, the light quantity distribution in the cross section passing through the central axis C was obtained by simulation. The simulation results are summarized in FIG. 19(a). In addition, in FIG. 19A, the vertical axis represents the amount of light normalized by the peak value.

In the simulation result of FIG. 19(a), the light source is plotted using the diameter used in the actual simulation. The horizontal axis was normalized by dividing the distance from the center, which is the horizontal axis of FIG. As shown in FIGS. 18A to 18G, the radius of the light source area is 10 mm for one turn, 20 mm for two turns, 30 mm for three turns, 40 mm for four turns, and 40 mm for five turns. 50 mm, 60 mm for 6 turns, and 70 mm for 7 turns.

FIG. 19(b) shows the simulation result with normalization of the horizontal axis. As shown in FIG. 19(b), regardless of the number of light emitting diodes used, the distance (distance from the center/radius of the light source area) at which the amount of light reaches 60% of the peak value is almost constant. .

Similarly, FIG. 20(a) shows a simulation result when the light distribution angle is 140°, and FIG. 20(b) shows a graph in which the horizontal axis is normalized. As shown in FIG. 20(b), when the light distribution angle is 140°, the relationship between the normalized amount of light and the distance (distance from the center/radius of the light source region) is almost the same. .

From the above, it was found that the number of light-emitting diodes 2 used does not contribute to the uniformity of the amount of light on the irradiation surface 3 when the LED pitch is constant. In other words, it was found that the evaluation according to this embodiment is effective regardless of the number of light emitting diodes 2 used.

(More desirable conditions)
Summarizing the above simulation results, it can be said that it is desirable to satisfy either of the following conditions (1) and (2) in order to further improve the uniformity of the amount of light on the irradiation surface 3 .

(1) The light distribution angle of each light emitting diode is less than 50°, the optical distance D from each light emitting diode 2 to the irradiation surface 3 is 200 mm or less, and the LED pitch is 8.5 mm or more and less than 20 mm. is.

(2) The light distribution angle of each light emitting diode is greater than 80°, the optical distance D from each light emitting diode 2 to the irradiation surface 3 is 80 mm or more, and the LED pitch is 8.5 mm or more and 20 mm or less. be.

(Actions and effects of the embodiment)
As described above, the light source device 1 according to the present embodiment is a device in which a plurality of light emitting diodes 2 are arranged on a plane, and the light distribution angle of each light emitting diode 2 is less than 50° or 80°. greater than This makes it possible to improve the uniformity of the amount of light on the irradiation surface 3 .

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the scope of claims. Also, it should be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

The present invention can be appropriately modified and implemented without departing from the gist thereof. For example, in the above embodiment, the simulation was performed on the assumption that the light distribution angles of the light emitting diodes 2 were constant, but it is not essential that the light distribution angles of the light emitting diodes 2 are constant.

Further, in the above embodiment, the position of the irradiation surface 3 (the optical distance D from the light emitting diode 2 to the irradiation surface 3) is specified, but the irradiation of light to the object is performed at a position including the irradiation surface 3. As long as it is performed, for example, the target object may also be irradiated with light in areas before and after the irradiation surface 3 . As an example, when sterilizing (or inactivating bacteria) by irradiating running water with ultraviolet light from the light emitting diode 2, the running water is also irradiated with ultraviolet light before and after the set irradiation surface 3. Such cases are also included in the present invention. In this example, it is possible to suppress sterilization failure by making the amount of ultraviolet light uniform on the set irradiation surface 3 .

In the above embodiment, a case has been described in which the plurality of light emitting diodes 2 are arranged at regular intervals in the circumferential direction and radial direction. As described above, the pitch of the light-emitting diodes may be appropriately changed within a range in which the uniformity of the amount of light on the irradiation surface 3 can be maintained. Further, the light emitting diodes 2 need not be arranged in a circular shape as a whole, and may be arranged in a rectangular shape as a whole, for example.

DESCRIPTION OF SYMBOLS 1... Light source device 2... Light emitting diode 3... Irradiation surface

Claims (5)

A light source device for a fluid sterilizer used in a fluid sterilizer that sterilizes fluid by irradiating ultraviolet light,
It is configured by arranging a plurality of light emitting diodes that emit ultraviolet light on the mounting surface,
the light distribution angle of each light emitting diode is less than 50° or greater than 80°;
the mounting surface is a plane, and a light source area having a predetermined radius centered on a central axis perpendicular to the plane has the plurality of light emitting diodes aligned;
In a virtual irradiation plane parallel to the plane and onto which the light from each light emitting diode is irradiated, at least the value obtained by dividing the distance from the central axis by the radius of the light source region is -0.9. In the range of 0.9 or less, the light amount is 60% or more of the peak value,
Light source device for fluid sterilizer. A light source device for a fluid sterilizer used in a fluid sterilizer that sterilizes fluid by irradiating ultraviolet light,
It is configured by arranging a plurality of light emitting diodes that emit ultraviolet light on the mounting surface,
the light distribution angle of each light emitting diode is less than 50° or greater than 80°;
the mounting surface is a plane, and a light source area having a predetermined radius centered on a central axis perpendicular to the plane has the plurality of light emitting diodes aligned;
In a virtual irradiation surface parallel to the plane and irradiated with light from each light emitting diode, at least a value obtained by dividing the distance from the central axis by the radius of the light source region is −0.5. In the range of 0.5 or less, the light amount is 80% or more of the peak value,
Light source device for fluid sterilizer. The plurality of light emitting diodes are arranged at equal intervals in a circumferential direction and a radial direction about a central axis perpendicular to the plane,
The arrangement pitch of the light emitting diodes in the radial direction is 8.5 mm or more and 15 mm or less.
The light source device for a fluid sterilizer according to claim 1 or 2 . A light source device for a fluid sterilizer used in a fluid sterilizer that sterilizes fluid by irradiating ultraviolet light,
It is configured by arranging a plurality of light emitting diodes that emit ultraviolet light on the mounting surface,
the light distribution angle of each light emitting diode is less than 50° or greater than 80°;
the mounting surface is flat,
The plurality of light emitting diodes are arranged at equal intervals in a circumferential direction and a radial direction about a central axis perpendicular to the plane,
The arrangement pitch of the light emitting diodes in the radial direction is 8.5 mm or more and 15 mm or less.
Light source device for fluid sterilizer. A light source device having a light distribution angle of less than 50 ° or greater than 80 ° and including a plurality of light emitting diodes that irradiate ultraviolet light,
It is configured to sterilize the fluid by irradiating the ultraviolet light,
The light source device
a mounting surface of the light emitting diodes is a plane, and a light source area having a predetermined radius centered on a central axis perpendicular to the plane has the plurality of light emitting diodes aligned;
In a virtual irradiation plane parallel to the plane and onto which the light from each light emitting diode is irradiated, at least the value obtained by dividing the distance from the central axis by the radius of the light source region is -0.9. In the range of 0.9 or less, the light amount is 60% or more of the peak value,
Fluid sterilizer.

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