JP2014233383A - Photocatalytic sterilization deodorizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photocatalytic sterilization deodorizing device which allows a photocatalyst to be approximately uniformly exposed to ultraviolet rays from light-emitting diodes for uniform activation of the photocatalyst to achieve uniform sterilization deodorizing effects of the photocatalyst, having high sterilization deodorizing effect and high reliability with very little deterioration of parts caused by ultraviolet rays.SOLUTION: The photocatalytic sterilization deodorizing device includes: a surface light source 10 having a plurality of light-emitting diodes 12 mainly composed of inorganic material, distributed in a planar form on a substrate 11; and a photocatalytic member 20 having a photocatalyst 22 exposed to ultraviolet rays from the surface light source 10.

Description

  The present invention relates to a photocatalyst sterilization deodorization apparatus.

Conventionally, as a photocatalyst sterilization deodorization apparatus, there exists a thing of Unexamined-Japanese-Patent No. 2004-663 (patent document 1). This photocatalyst sterilization deodorizing apparatus is composed of a point light source composed of one light emitting diode formed by sealing one light emitting diode chip emitting ultraviolet rays with a mold lens made of epoxy resin, and titanium dioxide (TiO ₂ ) as a base material. And a photocatalyst member carrying the photocatalyst. Then, the photocatalyst member is irradiated with ultraviolet rays from the light-emitting diode that is the point light source to activate the surface of titanium dioxide to sterilize and deodorize the air.

  Since the conventional photocatalyst sterilization and deodorization apparatus uses a light-emitting diode that emits ultraviolet light as compared with the case of using an ultraviolet lamp, it has an advantage of saving space and energy.

JP 2004-663 A

  However, the following problems (1) and (2) still remain in the conventional photocatalyst sterilization deodorization apparatus.

    (1) Since a light emitting diode (hereinafter also referred to as LED) that emits ultraviolet light is a point light source, the intensity of ultraviolet light (ultraviolet light) from the LED irradiated to the surface of the photocatalyst to be activated does not vary depending on the location. It becomes uniform. For this reason, activation of a photocatalyst becomes non-uniform | heterogenous according to a place, and there exists a problem that the disinfection and deodorizing effect by a photocatalyst with respect to a target object become non-uniform | heterogenous, and a disinfection and a deodorizing effect are small.

  As a countermeasure, when an attempt is made to provide a light diffusion sheet made of plastic in order to diffuse the ultraviolet rays from the LEDs (this will be explained for the sake of convenience, not the prior art), the light to be diffused is ultraviolet rays. The ultraviolet ray deterioration of the light diffusion sheet becomes a problem.

    (2) The light from the LED chip originally has directivity. For this reason, in the said conventional photocatalyst sterilization deodorizing apparatus, LED chip is sealed with the mold lens which consists of epoxy resins, and an ultraviolet-ray is diffused with this mold lens. However, when a plastic part (organic substance) such as a molded lens made of epoxy resin is used as a component part of the LED, the plastic part is deteriorated by ultraviolet rays, and the reliability of the LED is lowered.

  Therefore, the object of the present invention is to irradiate the photocatalyst with UV light from the LED substantially uniformly, to make the activation of the photocatalyst uniform, and to increase the sterilization and deodorizing effect by the photocatalyst, and to the parts using UV light It is an object of the present invention to provide a highly reliable photocatalyst sterilization and deodorization apparatus that hardly deteriorates.

In order to solve the above problems, the photocatalyst sterilization deodorization apparatus of the present invention is
A surface light source that emits ultraviolet light and includes a plurality of light emitting diodes mainly composed of an inorganic substance and a substrate, and the plurality of light emitting diodes are distributed in a planar shape on the substrate;
The photocatalyst member which has a base material and the photocatalyst provided in the surface of this base material and irradiated with the ultraviolet light from the said surface light source is characterized by the above-mentioned.

In this specification, a surface light source refers to a light source in which a plurality of light emitting diodes are distributed in a planar shape on a substrate. In addition, “a plurality of light emitting diodes are distributed in a planar shape on a substrate” means that a plurality of light emitting diodes are distributed almost uniformly in an area of at least 10 cm ² , and 100 or more light emitting diodes are distributed per 1 cm ^2. Say that you are.

  Further, in this specification, “mainly composed of an inorganic substance” means that the ratio of the mass of the inorganic substance exceeds 50% with respect to the total mass. In other words, “mainly composed of an inorganic substance” means that the ratio of the mass of the organic substance is less than 50% with respect to the total mass even if the organic substance is not contained or the organic substance is contained. means.

  According to the present invention, since the photocatalyst is irradiated with ultraviolet light from a surface light source in which a plurality of light emitting diodes are distributed in a plane on the substrate, the photocatalyst is irradiated with the ultraviolet light substantially uniformly. The sterilization and deodorizing effects can be made uniform and increased.

  Further, according to the present invention, since the plurality of light emitting diodes are mainly composed of an inorganic substance and not an organic substance, and the surface light source composed of the plurality of light emitting diodes is used, the light diffusion is performed. This eliminates the need for or reduces the use of resin-made package parts such as an optical system for the light-emitting diode itself, and highly reliable photocatalyst with almost no deterioration of the light-emitting diode itself and other parts. A sterilizing and deodorizing apparatus can be realized.

It is a typical structure figure of the photocatalyst sterilization deodorization apparatus of a 1st embodiment of this invention. It is a top view of the surface light source of the said 1st Embodiment. It is a perspective view of the light emitting diode of the said 1st Embodiment. It is process drawing of the manufacturing method of the said light emitting diode. It is process drawing of the manufacturing method of the said light emitting diode. It is process drawing of the manufacturing method of the said light emitting diode. It is process drawing of the manufacturing method of the said surface light source. It is a circuit diagram of the equivalent circuit of the said surface light source. It is a wave form diagram which shows an example of the drive waveform of the said surface light source. It is a wave form diagram which shows another example of the drive waveform of the said surface light source. It is a figure which shows a prior art example typically. It is sectional drawing of the surface light source of the photocatalyst disinfection deodorizing apparatus of 2nd Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 3rd Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 3rd Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 3rd Embodiment of this invention. It is a circuit diagram of the equivalent circuit of the said surface light source. It is a wave form diagram which shows an example of the drive waveform of the said surface light source. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. It is process drawing of the manufacturing method of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. It is CC sectional view taken on the line of FIG. It is a top view of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. It is a schematic sectional drawing of the photocatalyst disinfection deodorizing apparatus of 5th Embodiment of this invention. It is a schematic sectional drawing of the photocatalyst disinfection deodorizing apparatus of 6th Embodiment of this invention. It is a schematic sectional drawing of the photocatalyst disinfection deodorizing apparatus of 7th Embodiment of this invention. It is a schematic sectional drawing of the photocatalyst disinfection deodorizing apparatus of 8th Embodiment of this invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
As shown in FIG. 1, the photocatalyst sterilization deodorizing apparatus of the first embodiment includes a surface light source 10 that emits ultraviolet light (ultraviolet light), and a photocatalyst member 20 that is irradiated with ultraviolet light V from the surface light source 10. A fluid F such as air or water that is sterilized and deodorized passes between the surface light source 10 and the photocatalyst member 20.

The photocatalyst member 20 includes a base material 21 and a photocatalyst 22 such as titanium dioxide (TiO ₂ ) provided on the surface of the base material 21 by, for example, coating.

  As shown in FIG. 2, the surface light source 10 includes, for example, a substrate 11 made of an inorganic material such as glass or ceramics, and a plurality of rod-shaped LEDs (hereinafter also referred to as microrod LEDs) 12 that emit ultraviolet light. First and second electrodes 31, 32 and intermediate electrodes 33, 33, 33, 33 are provided. A plurality of LEDs 12, 12, 12,... Between the first electrode 31 and the intermediate electrode 33, between the intermediate electrode 33 and the intermediate electrode 33, and between the intermediate electrode 33 and the second electrode 32, respectively. The anode electrode A and the cathode electrode K are connected. The plurality of LEDs 12, 12, 12,... Are distributed in a planar shape on the substrate 11 to constitute the surface light source 10.

In this specification, the surface light source refers to a light source in which a plurality of LEDs are distributed in a planar shape on a substrate. And, “a plurality of LEDs are distributed in a planar shape on a substrate” means that a plurality of LEDs are distributed substantially uniformly in an area of at least 10 cm ² , and 100 or more LEDs are distributed per 1 cm ² . Say that. In the following, the definition of the surface light source is the same.

  Thus, since the ultraviolet light source for activating the photocatalyst 22 on the surface of the photocatalyst member 20 is the surface light source 10, in a sterilization chamber such as a refrigerator having a limited space, for example. However, the photocatalyst 22 can be uniformly irradiated with ultraviolet light, the entire surface of the photocatalyst 22 can be activated, and an efficient and effective sterilization and deodorization treatment can be performed.

  Further, the surface light source 10 has a plurality of LEDs 12, 12, 12,... Distributed substantially uniformly in a planar shape, so that an optical system component made of plastic or the like for diffusing ultraviolet light into a planar shape is used. It is unnecessary. Therefore, in the first embodiment, the problem of lowering reliability due to the ultraviolet deterioration of the optical system component does not occur in principle.

  The directions of the LEDs 12, 12, 12,... Are randomly arranged. That is, the polarities of the anode electrode A and the cathode electrode K of the LEDs 12, 12, 12,. By applying an AC (alternating current) voltage between the second electrode 32 and the second electrode 32, ultraviolet light is emitted alternately from approximately half of the plurality of LEDs 12, 12, 12,.

  As shown in FIG. 3, the LED 12, that is, the microrod LED 12 has a substantially hexagonal prism shape (due to a crystal structure), and includes a core portion 27 </ b> A made of N-type AlGaN and a shell portion made of P-type AlGaN. 28 and a transparent electrode 29 made of an ITO (Indium Tin Oxide) layer. The shell portion 28 covers a part of the outer peripheral surface of the core portion 27 </ b> A, and the other part of the outer peripheral surface of the core portion 27 </ b> A is exposed from the shell portion 28. A portion 27A-1 of the core portion 27A exposed from the shell portion 28 forms a cathode electrode (hereinafter abbreviated as a cathode) K, and a transparent electrode 29 covering the shell portion 28 is an anode electrode (hereinafter abbreviated as an anode). ) Make A. The transparent electrode 29 covers substantially the entire outer peripheral surface of the shell portion 28 so that the current does not concentrate in one place, and from substantially the entire interface between the core portion 27A and the shell portion 28 of the microrod LED 12, Ultraviolet light is emitted efficiently.

  The microrod LED 12 includes a core portion 27A made of N-type AlGaN, a shell portion 28 made of P-type AlGaN, and a transparent electrode 29 made of ITO. Since it does not contain, the fall of the reliability of the element itself resulting from an ultraviolet light can be prevented. However, although not shown, the LED may include an inorganic substance as a main component and an organic substance of less than 50% by mass. Even in this case, since the LED has a small amount of organic material, it is possible to reduce the deterioration of ultraviolet rays.

  Here, in LED, an inorganic substance as a main component means that it exceeds 50% including the case where the mass% of the inorganic substance is 100% with respect to the total mass.

  Next, the manufacturing method of the surface light source 10 of the said photocatalyst sterilization deodorizing apparatus is demonstrated in order of a process.

  I. First, as shown in FIG. 4, an AlN buffer layer 26 is epitaxially grown on an AlN substrate 25, and then an N-type AlGaN layer 27 is formed. Thereafter, the N-type AlGaN layer 27 is etched to form a portion 27A to be the core portion of the microrod LED 12.

  The formation of the portion 27A to be the core portion is not necessarily formed by etching. For example, a dot-shaped catalyst (not shown) formed on the N-type AlGaN layer 27 formed on the AlN buffer layer 26 is used. The rod-shaped portion 27A to be the core portion as a nucleus may be formed by crystal growth.

  Thereafter, a P-type AlGaN layer 28 and an ITO layer 29 are sequentially deposited on the N-type AlGaN layer 27 including the rod-shaped portion 27A to form a portion to be the microrod LED 12.

  II. Next, as shown in FIG. 5, the P-type AlGaN layer 28 and the ITO layer 29 should be removed from the tip portion 27 </ b> A- 1 of the rod-shaped portion 27 </ b> A that should become the core portion of the microrod LED 12 to become the core portion. The tip 27A-1 of the rod-shaped portion 27A of the N-type AlGaN layer 27 is exposed, the cathode K is formed, and the microrod LED 12 is formed. The remaining portion of the TO layer 29 becomes the anode A.

  III. The microrod LED 12 formed on the AlN substrate 25 is cut by wet etching and separated from the AlN substrate 25 as shown in FIG. Note that the separation method is not limited to etching, and for example, cutting may be performed by laser ablation, ultrasonic waves, mechanical force, or the like.

  IV. The harvested microrods LED 12, 12, 12,... Are uniformly mixed in a liquid (for example, pure water, IPA (isopropyl alcohol)). Thereafter, as shown in FIG. 7, the liquid is made to flow on the substrate 11 on which the first and second electrodes 31 and 32 and the intermediate electrodes 33, 33, 33, 33 are formed in advance, and the first and second By applying an AC voltage to the electrodes 31, 32 and the intermediate electrode 33, the comb-like protrusions 31-1, 32-1 of the first and second electrodes 31, 32 and the comb teeth of the intermediate electrode 33 The anode A and the cathode K of the microrod LED 12 are randomly attached to the protruding portion 33-1 without aligning the polarities.

  V. Next, as shown in FIG. 2, the wiring part 13 utilizing the intermediate electrodes 33 and 33 as a part is formed by a photolithography technique.

  The AlN buffer layer 26, the N-type AlGaN layer 27, the P-type AlGaN layer 28 and the like can be easily formed by using, for example, MOCVD (metal organic chemical vapor deposition).

  By performing the steps I to V described above, the surface light source 10 containing an inorganic substance as a main component can be manufactured at low cost.

  Next, the operation of the surface light source 10 will be described.

  FIG. 8 is an equivalent circuit of the surface light source 10. As shown in FIGS. 8 and 9, the surface light source 10 includes the potential V1 of the first electrode 31 and the second electrode 32 between the first electrode 31 and the second electrode 32 at predetermined time intervals. A rectangular wave voltage is applied to the first electrode 31 and the second electrode 32 so that the level between the potential V2 is switched. As a result, during the period when the potential V1 of the first electrode 31 is higher than the potential V2 of the second electrode 32, approximately half of the electrodes connected with the polarity that emits light when current flows from the first electrode 31 to the second electrode 32. The LED 12 emits light. Further, in the period when the potential V2 of the second electrode 32 is higher than the potential V1 of the first electrode 31, approximately half of the LEDs 12 connected with a polarity that emits light when a current flows from the second electrode 32 to the first electrode 31. Emits light.

  Instead of the rectangular wave voltage shown in FIG. 9, a voltage having a sine waveform shown in FIG. 10 may be applied between the first electrode 31 and the second electrode 32. In this case, the potential V1 of the first electrode 31 is a sine wave, and the potential V2 of the second electrode 32 is constant at 0V.

  In addition, regarding the random arrangement of the polarity of the LED, not only when the polarity is different between the two ends of the LED, but also when the polarity is different between the front and back of a strip-shaped LED (not shown), the front and back of the LED are randomly It is possible to operate in the same manner as described above.

  The photocatalyst sterilization deodorization apparatus having the above-described configuration operates as follows.

  As shown in FIG. 1, an AC voltage is applied to the surface light source 10 by flowing a fluid F such as air or water between the surface light source 10 and the photocatalyst 22 of the photocatalyst member 20 or holding it in a stationary state. Then, the surface light source 10 is driven.

  Then, the ultraviolet light V is irradiated from the surface light source 10 to the entire surface of the photocatalyst 22 of the photocatalyst member 20 with a substantially uniform irradiation intensity. In this way, regardless of the location of the photocatalyst 22, the entire surface of the photocatalyst 22 is irradiated with the ultraviolet light V with a substantially uniform irradiation intensity, and the photocatalyst 22 is uniformly activated. An effect can be obtained.

  In addition, since the ultraviolet light V is irradiated from the surface light source 10 onto the object such as the fluid F with a substantially uniform irradiation intensity, the sterilization and deodorizing effects of the ultraviolet light V on the object are enhanced.

  On the other hand, in the conventional example, as schematically shown in FIG. 11, the LED 19 is a point light source. Therefore, the irradiation intensity of the ultraviolet light to the photocatalyst 22 becomes nonuniform, and the sterilization and deodorizing effect depends on the location. It becomes uneven and the sterilization and deodorizing effect is low.

  Further, in the first embodiment, since the surface light source 10 is used, there is no need for an optical system component made of plastic or the like for diffusing light, so there is no problem of ultraviolet deterioration and the cost is reduced. can do.

  Further, since the LED 12 is mainly composed of an inorganic substance and does not contain an organic substance, the organic substance does not deteriorate due to ultraviolet irradiation.

  Note that the LED may contain a small amount of an organic material and an inorganic material as a main component. Even in this case, even if the LED contains an organic substance, the amount of the LED is small, so that the deterioration of ultraviolet rays caused by the ultraviolet irradiation is small, so that the reliability can be improved.

(Second Embodiment)
FIG. 12 is a cross-sectional view of the surface light source 110 of the photocatalytic sterilization deodorizing apparatus according to the second embodiment of the present invention. This second embodiment differs from the first embodiment only in the configuration of the surface light source 110, and the other configurations are the same as those in the first embodiment. Drawing is used. Moreover, also about the component of the said surface light source 110, about the component which is the same as that of the surface light source 10 of 1st Embodiment, or a similar component, attach | subject the same reference number as the component of FIG. Description of the configuration and operation of the above will be omitted, and only different components will be described below.

As shown in FIG. 12, for example, a reflective film 41, an insulating film 113 made of an inorganic material such as SiO ₂ , an intermediate electrode 33, and the like are sequentially formed on one surface (surface) of the flexible substrate 40 made of an organic material such as a resin. First and second electrodes 31 and 32 (see FIG. 2) and a microrod LED 12 are provided.

The reflective film 41 is made of a material capable of reflecting ultraviolet light, such as Al (aluminum), an alloy of Al and MgF ₂ (magnesium difluoride), Au (gold), and the like.

  According to the above configuration, the ultraviolet light V emitted from the microrod LED 12 toward the flexible substrate 40 is reflected by the reflective film 41 and directed to the photocatalyst 22 (see FIG. 1) of the photocatalytic member 20.

  In particular, the microrod LED 12 emits light from the entire hexagonal columnar surface due to its structure. Therefore, the reflection film 41 reflects the ultraviolet light V emitted on the opposite side of the photocatalyst 22 by reflection of the photocatalyst 22 and the sterilization target. The direction can be changed in the direction, and the photocatalyst 22 and the object to be sterilized can be irradiated with ultraviolet light more efficiently.

  Therefore, the ultraviolet light V can be effectively and uniformly irradiated onto the photocatalyst 22 and the sterilization target, and the sterilization and deodorizing effect can be enhanced.

  Furthermore, since the ultraviolet light is reflected by the reflective film 41 of the surface light source 110 and the flexible substrate 40 made of an organic material is not irradiated with the ultraviolet light, the ultraviolet deterioration of the flexible substrate 40 made of the organic material can be prevented, and In addition, it is possible to prevent ultraviolet deterioration of electronic components and devices on the back side of the flexible substrate 40.

  Instead of the flexible substrate 40, an inflexible substrate made of an organic material such as a resin may be used.

(Third embodiment)
FIGS. 13 and 14 are plan views showing a manufacturing process of the surface light source of the photocatalyst sterilization and deodorizing apparatus according to the third embodiment of the present invention, and FIG. 15 is a plan view of the surface light source 112. This third embodiment is different from the first embodiment only in the configuration of the surface light source 112, and the other configurations are the same as those in the first embodiment. Therefore, these are the same as those in the first embodiment. Drawing is used. Moreover, also about the structural part of the said surface light source 112, about the structural part which is the same as that of the surface light source 10 of 1st Embodiment, or a similar part, attaches | subjects the same reference number as the structural part of FIG. Description of the configuration and operation of the above will be omitted, and only different components will be described below.

  First, as shown in FIG. 13, the first electrode 31, the second electrode 321, the first intermediate electrodes 331, 331, and the second intermediate electrodes 332, 332 are parallel to each other on the substrate 11. Provided.

  The plurality of comb-shaped protrusions 31-1 of the first electrode 31 and the plurality of comb-shaped protrusions 331-1 of the first intermediate electrode 331 are opposed to each other with a predetermined interval therebetween, The plurality of comb-shaped protrusions 321-1 of the second electrode 321 and the plurality of comb-shaped protrusions 332-1 of the second intermediate electrode 332 are opposed to each other with a predetermined interval. . Further, the plurality of comb-shaped protrusions 332-1 of the second intermediate electrode 332 and the plurality of comb-shaped protrusions 331-1 of the first intermediate electrode 331 are spaced apart from each other by a predetermined interval. Facing each other.

  The width of the protrusion 31-1 of the first electrode 31 and the width of the protrusion 332-1 of the second intermediate electrode 332 have the same width, and the transparent electrode 29 having a substantially cross-sectional hexagonal shape of the LED 12. The width is half of the maximum diameter (see FIG. 3), that is, the width of one side surface of the hexagonal columnar outer surface of the transparent electrode 29. On the other hand, the width of the protruding portion 321-1 of the second electrode 321 and the width of the protruding portion 331-1 of the first intermediate electrode 331 have the same width, and the LED 12 has a substantially hexagonal cross section. The width is half the maximum diameter of the electrode 29, that is, the width of one side surface of the hexagonal prism-shaped outer surface of the transparent electrode 29.

  Next, LEDs 12, 12, 12,... Are formed on the substrate 11 on which the first and second electrodes 31, 321, the first intermediate electrodes 331, 331, and the second intermediate electrodes 332, 332 are formed. When an AC voltage is applied to the first and second electrodes 31 and 321 and the first and second intermediate electrodes 331 and 332 while flowing a uniformly mixed liquid (for example, pure water, IPA) gently, Comb-like protrusions 31-1, 321-1 of the first and second electrodes 31, 321 and comb-teeth protrusions 331-1, 332 of the first and second intermediate electrodes 331, 332 1, the anodes A and cathodes K of the LEDs 12, 12, 12... Are attached with their polarities aligned.

  Thus, the polarities of the LEDs 12, 12, 12... Are aligned so that the width of the protruding portion 31-1 of the first electrode 31 is the first intermediate position facing the protruding portion 31-1. Since the width of the protruding portion 311-1 of the electrode 331 is wider than the protruding portion 311-1 of the first intermediate electrode 331, the transparent electrode 29 constituting the anode A of the LED 12 is wider than the protruding portion 311-1 of the first electrode 31. It is because it is pulled more strongly. In the LED 12, the anode A is connected to the protruding portion 31-1 of the first electrode 31, and the cathode K is connected to the protruding portion 331-1 of the first intermediate electrode 331. Exactly the same is true for the LED 12 between the second intermediate electrode 332 and the first intermediate electrode 331 and the LED 12 between the second intermediate electrode 332 and the second electrode 321 as shown in FIG. Are aligned.

  Next, as illustrated in FIG. 14, the wiring portion 131 is formed by using the first intermediate electrode 331 and the second intermediate electrode 332 as a part by a photolithography technique.

  Next, as shown in FIG. 15, longitudinal grooves G, G,... Are formed in the wiring portions 131, 131 by etching, and the wiring portions 131, 131 are divided to obtain the first row. Five divided wiring portions 13-1 and five divided wiring portions 13-2 in the second row are formed. As described above, in FIG. 15, the number is set to 5 for the sake of easy understanding, but in reality, the number is preferably much larger than 5.

  In this way, the surface light source 112 in which a plurality of LEDs 12, 12, 12,.

  FIG. 16 is an equivalent circuit of the surface light source 112. In FIG. 17, V 1 is the voltage of the first electrode 31, and V 2 is the voltage of the second electrode 321.

  Since the surface light source 112 irradiates the entire surface of the photocatalyst 22 (see FIG. 1) with ultraviolet light with a uniform irradiation intensity and the photocatalyst 22 is uniformly activated, an effective sterilizing and deodorizing effect. Can be obtained. Moreover, since the ultraviolet light can be irradiated to the fluid F such as air or water (see FIG. 1) with a uniform illuminance, the sterilization and deodorizing effect by the ultraviolet light itself on the fluid F can be enhanced.

  As shown in FIGS. 15 and 16, three LEDs 12, 12, 12 are connected in parallel in the current path connecting the divided wiring portion 13-1 and the divided wiring portion 13-2. Even if one or two LEDs 12 out of the individual LEDs 12 fail, the current path is not interrupted, and thus the other LEDs 12 can continue to emit ultraviolet light. Therefore, the surface light source 112 is highly reliable. Here, three LEDs 12 are connected in parallel, but two or more may be used.

  In the third embodiment, unlike the first and second embodiments, all the LEDs 12, 12, 12,... Are formed in the same direction. Differently, for example, as shown in FIG. 17, if an appropriate DC voltage V1 is applied between the first electrode 31 and the second electrode 321, all the LEDs 12 are lit.

  For this reason, in this 3rd Embodiment, when LED12, 12, 12, ... with the same number of elements as the array of LED12, 12, 12, ... of the surface light source 10 of 1st Embodiment is arranged. In this case, the current input per element can be reduced as compared with the first embodiment. This is because in the first embodiment, only half of all LEDs 2 emit light at the same time, so that a desired amount of light must be emitted in a half time zone of the total voltage application time, whereas in the third embodiment, This is because all the LEDs 12 emit light simultaneously.

  Therefore, in the third embodiment, the reliability of the surface light source 112 can be improved.

  In addition, if the currents flowing to the LEDs 12 are the same in the first and third embodiments, the number of LEDs 12 is smaller than the number of LEDs 12 in the first embodiment, and the third embodiment has a desired light quantity. Since the light source 112 is obtained, the surface light source 112 can be manufactured at low cost.

(Fourth embodiment)
18-24 is a figure which shows the manufacturing process of the surface light source of the photocatalyst disinfection deodorizing apparatus of 4th Embodiment of this invention. In the fourth embodiment, only the configuration of the surface light source 113 shown in FIG. 24 is different from the first embodiment, and other configurations are the same as those of the first embodiment. Therefore, for those, the drawing of the first embodiment is used. To do. In addition, for the components of the surface light source 113, the same or similar components as those of the surface light source 10 of the first embodiment are denoted by the same reference numerals as those of the components of FIG. Description of composition and operation is omitted, and only different components will be described below.

  A method for manufacturing the surface light source 113 shown in FIG.

  I. First, as shown in FIG. 18, an epitaxially grown AlN layer 412, an N-type AlGaN layer 413, a P-type AlGaN layer 414, a transparent electrode 415 made of ITO, and an insulating film 416 are sequentially stacked on an AlN substrate 411.

  II. As shown in the plan view of FIG. 19, a plurality of lateral separation grooves 121 are formed at regular intervals in the stacked body shown in FIG. 18 by a photolithography technique, and the vertical separation grooves 122 are constant with each other. After the formation, the epitaxially grown AlN layer 412 is removed by selective etching, and the strip-shaped LEDs 211, 211,... Are separated from the AlN substrate 411. The strip-shaped LED 211 has the same cross-sectional structure as that of a general LED, but has an insulating film 416 (see FIG. 18) for controlling the front and back surfaces in a collective arrangement process described later.

  III. Next, as shown in FIG. 20, a plurality of strip-shaped LEDs 211 are mixed almost uniformly with a liquid (for example, pure water, IPA).

  IV. As shown in FIG. 21, an insulating substrate 11 made of an inorganic material such as glass on which first and second electrodes 31 and 32 and an intermediate electrode 33 are formed in advance is prepared, and a plurality of strips are formed on the substrate 11. A liquid containing the LED 211 is made to flow. Thereafter, an alternating voltage is applied to the first and second electrodes 31 and 32 and the intermediate electrode 33, and the comb-like protrusions 31-1 and 32-1 of the first and second electrodes 31 and 32 are intermediate. The LED 211 is attached to the comb-like protrusion 33-1 of the electrode 33.

  At this time, since the N-type AlGaN layer 413 is more strongly attracted to the first electrode 31, the intermediate electrode 33, and the second electrode 32 than the insulating film 416, the LED 211 has the N-type AlGaN layer 413 side facing the first electrode 31. , Adhere to the intermediate electrode 33 and the second electrode 32.

  Although not shown, an extremely thin insulating film for a subsequent wiring process is formed on the first and second electrodes 31 and 32 and the intermediate electrode 33.

  V. Next, as shown in FIG. 21, a wiring process is performed on the LED 211 while forming the wiring part 13 that uses the intermediate electrodes 33 and 33 as a part as shown in FIG. Thus, the LED 212 is formed.

  As shown in FIG. 23, a step 212A reaching the middle of the N-type AlGaN layer 413 is formed in the LED 212 by etching. Then, an insulating layer 418 is formed, and the transparent electrode 415 made of ITO and the wiring portion 13 (intermediate electrode 33) are projected by the wiring layer 419 passing through the contact holes 418A and 416A formed in the insulating layer 418 and the insulating layer 416. The unit 33-1 is electrically connected. At this time, an insulating film (not shown) on the wiring portion 13 is removed when the wiring layer 419 and the protruding portion 33-1 of the wiring portion 13 are electrically connected.

  Further, the step portion of the N-type AlGaN layer 413 and the protruding portion 32-1 of the second electrode 32 are electrically connected by the wiring layer 420 passing through the contact holes 418B and 418C formed in the insulating layer 418. At this time, an insulating film (not shown) on the second electrode 32 is removed at the time of electrical connection between the wiring layer 420 and the protruding portion 32-1 of the second electrode 32.

  The LED 212 between the first electrode 31 and the wiring part 13 and the LED 212 between the wiring parts 13 and 13 are electrically connected by a wiring layer (not shown) in the same manner as described above.

  VI. Next, as shown in FIG. 24, vertical grooves G, G,... Are formed in the wiring portions 13 and 13 by etching, and the wiring portions 13 and 13 are divided to form the first row. Five divided wiring portions 13-1 and five divided wiring portions 13-2 in the second row are formed.

  In this way, the surface light source 113 is manufactured in which a plurality of LEDs 212, 212, 212,.

  An equivalent circuit of the surface light source 113 is the same as FIG.

  In the fourth embodiment, since the strip-shaped LEDs 212 are configured by layers sequentially laminated in a planar shape, there is an advantage that the film quality deterioration due to the process is relatively small.

  Since the surface light source 113 irradiates the entire surface of the photocatalyst 22 (see FIG. 1) with ultraviolet light with a uniform irradiation intensity, and the photocatalyst 22 is uniformly activated, an effective sterilizing and deodorizing effect. Can be obtained. Moreover, since the ultraviolet light can be irradiated to the fluid F such as air or water (see FIG. 1) with a uniform illuminance, the sterilization and deodorizing effect by the ultraviolet light itself on the fluid F can be enhanced.

  As shown in FIG. 24, three LEDs 212, 212, and 212 are connected in parallel to the current path connecting the divided wiring portion 13-1 and the divided wiring portion 13-2. Of these, even if one or two LEDs 212 fail, their current paths are not interrupted, so that the other LEDs 212 can continue to emit ultraviolet light. Therefore, the surface light source 113 is highly reliable.

  In the fourth embodiment, unlike the first embodiment, all the LEDs 212, 212, 212,... Are formed in the same direction. Therefore, unlike the first embodiment, the first embodiment is different from the first embodiment. If an appropriate DC voltage is applied between the electrode 31 and the second electrode 321, all the LEDs 212 are lit.

  For this reason, in this 4th Embodiment, when LED212,212,212, ... of the same number of elements as the array of LED12, 12, 12, ... of the surface light source 10 of 1st Embodiment is arranged. In this case, the current input per element can be reduced as compared with the first embodiment. This is because in the first embodiment, only half of all the LEDs 12 emit light at the same time, so that a desired amount of light must be emitted in a half time zone of the total voltage application time, whereas in the fourth embodiment, This is because all the LEDs 212 emit light simultaneously.

  Therefore, in the fourth embodiment, the reliability of the surface light source 113 can be improved.

  Also, if the currents flowing to the LEDs 12 and 212 are the same in the first and fourth embodiments, the number of LEDs 212 is smaller than the number of LEDs 12 in the first embodiment, and the fourth embodiment has a desired light quantity. Therefore, the surface light source 113 can be manufactured at a low cost.

(Fifth embodiment)
In the photocatalyst sterilization deodorization apparatus of the fifth embodiment, as shown in FIG. 25, the curved surface light source 110 and the curved photocatalyst member 20 face each other to form a flow path P. Fluid such as air and water to be sterilized and deodorized flows in the flow path P.

  The surface light source 110 differs from the surface light source 110 of the second embodiment only in that it is curved, and the other configuration is exactly the same as the surface light source 110 of the second embodiment. The same reference numbers as those of the light source 110 are used. Also, the photocatalyst member 20 is different from the photocatalyst member 20 of the first embodiment only in that it is curved, and the other configuration is exactly the same as that of the photocatalyst member 20 of the first embodiment. The same reference numbers as those of the photocatalyst member 20 are used.

  Although not shown, the surface light source 110 and the photocatalyst member 20 are fixed to a casing.

  In the photocatalyst sterilization deodorizing apparatus having the above configuration, since the surface light source 110 uses the flexible substrate 40 (see FIG. 12), the degree of freedom of the shape of the surface light source 110 is high. A curved shape can be obtained.

  Thus, since the degree of freedom of the surface light source 110 is high, the overall size of the system including the photocatalytic sterilization deodorizing apparatus can be reduced by adapting to the shape of the space in the system including the photocatalytic sterilization deodorizing apparatus as a unit. Can be planned. In this way, the photocatalyst sterilization and deodorization apparatus with a high degree of freedom can be used for, for example, volume-constrained applications (water sterilization in refrigerators, sterilization in air purifiers, and sterilization in automobile air purifiers. This is particularly effective when applied to in-vehicle applications).

  The ultraviolet light V from the surface light source 110 is uniformly applied to the photocatalyst 22 and the fluid F of the photocatalyst member 20. Therefore, a high sterilization and deodorization effect and a cleaning effect on the fluid F can be obtained by the sterilization and deodorization action by the uniform activation of the photocatalyst 22 and the uniform sterilization and deodorization by the ultraviolet light V itself.

  In particular, the reflection film 41 (see FIG. 12) can change the direction of the ultraviolet light V emitted on the side opposite to the photocatalyst 22 in the direction of the photocatalyst 22 and the sterilization target, and more efficiently the photocatalyst 22 and The fluid F can be irradiated with ultraviolet light V.

  Therefore, the ultraviolet light V can be effectively and uniformly irradiated onto the photocatalyst 22 and the sterilization target, and the sterilization and deodorizing effect can be further enhanced.

  Furthermore, since the ultraviolet light is reflected by the reflective film 41 of the surface light source 110 and the flexible substrate 40 made of an organic material is not irradiated with the ultraviolet light, the ultraviolet deterioration of the flexible substrate 40 made of the organic material can be prevented, and In addition, it is possible to prevent ultraviolet deterioration of electronic components and devices on the back side of the flexible substrate 40.

  In the fifth embodiment, a surface light source 110 similar to the surface light source 110 of the second embodiment is used, but the substrate of the surface light source of the first embodiment, the third and fourth embodiments is used in the second embodiment. Similarly to the above, a surface light source may be used instead of the flexible substrate 40 shown in FIG.

  Further, the substrate 11 made of glass or the like of the surface light sources 10, 112, and 113 of the first embodiment, the third and fourth embodiments may be curved and used.

(Sixth embodiment)
As shown in FIG. 26, the photocatalyst sterilization and deodorization apparatus of the sixth embodiment has a cylindrical surface light source 110 that emits ultraviolet light V from an inner peripheral surface, and a columnar shape in which a photocatalyst 22 is applied to the outer peripheral surface. A photocatalyst member 20. Then, a fluid F such as water or air flows in an annular passage P between the surface light source 110 and the photocatalyst member 20.

  The surface light source 110 and the photocatalyst member 20 of the sixth embodiment are different from the curved surface light source 110 and the photocatalyst member 20 of the fifth embodiment shown in FIG. The action and effect are exactly the same.

  Therefore, the surface light source 110 and the photocatalyst member 20 of the sixth embodiment are denoted by the same reference numerals as those of the fifth embodiment, and descriptions of the operations and effects thereof are omitted.

  The photocatalyst sterilization deodorization apparatus of the sixth embodiment has the same operations and effects as the photocatalyst sterilization deodorization apparatus of the fifth embodiment.

(Seventh embodiment)
As shown in FIG. 27, the photocatalyst sterilization and deodorization apparatus of the seventh embodiment is applied to, for example, a refrigerator and has a sterilization chamber R.

  The sterilization chamber R is formed inside a substantially rectangular parallelepiped casing 400, and is formed by a surface light source 401 provided near the top surface, a wall 402 and a bottom 403 of the casing 400. Although not shown, a door is provided on the front side of the casing 400 so as to be openable and closable.

The surface light source 401 has the same configuration as any one of the surface light sources 10, 110, 112, and 113 of the first to fourth embodiments, and emits ultraviolet light uniformly in a planar shape. Similar to the first embodiment, a photocatalyst such as titanium dioxide (TiO ₂ ) is provided on the inner surfaces of the wall 402 and the bottom portion 403. Thereby, not only the direct sterilization action by ultraviolet light but also the sterilization and deodorization action by the action of the photocatalyst can be obtained.

  Further, the wall 402 and the bottom portion 403 other than the surface light source 401 are not only provided with the photocatalyst, but are also almost completely sealed with metal, water glass or the like so that ultraviolet rays do not leak outside the room.

  For this reason, ultraviolet rays do not leak out of the sterilization chamber R, and deterioration of the resin products such as plastics and electronic components arranged outside the sterilization chamber R due to the ultraviolet rays can be prevented.

  The walls 402 and the bottom 403 other than the surface light source 401 are preferably provided with a reflective film or the like so as to reflect ultraviolet light. If it carries out like this, the ultraviolet light irradiated from the said surface light source 401 can be reflected and used effectively, a target object can be disinfected effectively, and a photocatalyst can be activated effectively.

  Reference numeral 404 denotes a net for placing a dish or the like.

  In the photocatalyst sterilization deodorization apparatus having the above configuration, when fresh food such as meat and sashimi is put in the sterilization chamber R and the surface light source 401 is driven, ultraviolet light is irradiated from the surface light source 401 to the fresh food substantially uniformly. The wall 402 and the bottom 403 are also irradiated substantially uniformly.

  Therefore, the bacteria attached to the surface of the fresh food can be directly sterilized with ultraviolet light, and the sterilization and deodorizing effects by the activation of the photocatalyst contained in the wall 402 and the bottom 403 of the sterilization chamber R are effective for the target food. The deadline can be extended and the odor associated with indoor storage can be eliminated.

  In addition, also about cooked foods, such as a lunch box, the bacteria adhering to the surface of the foodstuff at the time of cooking can be sterilized by performing a sterilization process in the sterilization room R previously, and the reproduction can be suppressed. For this reason, cooked food can be made hard to rot.

(Eighth embodiment)
As shown in FIG. 28, the photocatalyst sterilization deodorizing apparatus of the eighth embodiment is different from the photocatalyst sterilization deodorizing apparatus of the seventh embodiment shown in FIG. 27 only in that a wavelength conversion filter 500 is provided. Therefore, in FIG. 28, the same components as those of FIG. 27 are denoted by the same reference numerals as those of FIG. 27, detailed description thereof will be omitted, and different components will be described below.

  As shown in FIG. 28, in the sterilization chamber R, a wavelength conversion filter 500 is detachably provided below the surface light source 401. The wavelength conversion filter 500 has a function of converting ultraviolet light into orange or blue light.

  Conventionally, it is known that storage performance is enhanced when vegetables are irradiated with orange or blue light from LEDs. (For example, refer to JP 2006-17443 A.)

  According to the photocatalyst sterilization and deodorization apparatus having the above-described configuration, when sterilizing bacteria attached to the surface of an object to be placed in the sterilization chamber R, the wavelength conversion filter 500 is removed and the object and the photocatalyst are directly irradiated with ultraviolet rays. . On the other hand, when enhancing the storage performance of vegetables or the like, the wavelength conversion filter 500 can be attached, and the vegetables can be irradiated with orange or blue light from the wavelength conversion filter 500.

  As described above, according to the eighth embodiment, the limited space in the refrigerator can be selectively used for sterilization and deodorization and improvement in storage performance of vegetables and the like, and this space is utilized more efficiently. be able to.

  Of course, the constituent elements of the first to fourth embodiments may be combined as appropriate and may be replaced as appropriate.

  Moreover, you may use any of the surface light sources of 1st Embodiment to 4th Embodiment for the photocatalyst disinfection deodorizing apparatus of the said 5th Embodiment to 8th Embodiment. Furthermore, the photocatalyst sterilization deodorization apparatus of the fifth to eighth embodiments is appropriately combined with the components of the surface light source of the first to fourth embodiments, or the first to fourth embodiments. You may use what replaced the component of the surface light source of embodiment suitably.

  The present invention and the embodiment are summarized as follows.

This invention photocatalyst sterilization deodorization apparatus,
It includes a plurality of light emitting diodes 12 and 212 mainly emitting an inorganic substance, and substrates 11 and 40, and the plurality of light emitting diodes 12 and 212 are planar on the substrates 11 and 40. Surface light sources 10, 110, 112, 113, 401 distributed in
A photocatalyst member 20 having a base material 21 and a photocatalyst 22 provided on the surface of the base material 21 and irradiated with the ultraviolet light V from the surface light sources 10, 110, 112, 113, 401 is provided. It is said.

  According to the above configuration, the ultraviolet light V is irradiated from the surface light sources 10, 110, 112, 113, 401 to the entire surface of the photocatalyst 22 of the photocatalyst member 20 with a substantially uniform irradiation intensity. In this way, regardless of the location of the photocatalyst 22, the entire surface of the photocatalyst 22 is irradiated with the ultraviolet light V with a substantially uniform irradiation intensity, and the photocatalyst 22 is uniformly activated. An effect can be obtained.

  Further, since the ultraviolet light V is evenly applied to the object such as the fluid F at the irradiation intensity from the surface light sources 10, 110, 112, 113, 401, the sterilization and deodorizing effect by the ultraviolet light V itself on the object. Becomes higher.

  Further, since the surface light sources 10, 110, 112, 113, and 401 are used, there is no need for an optical system part made of plastic or the like for diffusing light, so there is no problem of ultraviolet deterioration and the cost is reduced. Can be reduced.

  In addition, the light emitting diodes 12 and 212 are mainly composed of an inorganic substance and do not contain an organic substance or only a small amount thereof. Therefore, there is no deterioration of the organic substance due to ultraviolet irradiation. However, the reliability can be improved with less.

In one embodiment,
The surface light source 110 includes a reflective film 41 provided between the substrate 40 and the light emitting diode 12.

  According to the embodiment, the ultraviolet light V emitted from the light emitting diode 12 toward the substrate 40 is reflected by the reflective film 41 and directed to the photocatalyst 22.

  Thus, since the ultraviolet light V emitted to the side opposite to the photocatalyst 22 is redirected by the reflective film 41 in the direction of the photocatalyst 22 and the sterilization target, the ultraviolet light V is more effectively applied to the photocatalyst 22 and the sterilization target. Irradiation can be performed and the sterilization and deodorizing effect can be enhanced.

In one embodiment,
The substrate is a flexible substrate 40.

  According to the above embodiment, ultraviolet light is reflected by the reflective film 41 of the surface light source 110 and the flexible substrate 40 made of an organic material is not irradiated with ultraviolet light. In addition, it is possible to prevent ultraviolet deterioration of electronic components and devices on the back side of the flexible substrate 40.

One embodiment is:
A wavelength conversion filter 500 for converting the wavelength of the ultraviolet light V from the light emitting diodes 12 and 212 into at least one of orange light and blue light is detachably provided.

  According to the above embodiment, the wavelength conversion filter 500 can be removed, and the object and the photocatalyst can be directly irradiated with ultraviolet rays to obtain a sterilization and deodorizing effect. By irradiating vegetables with orange or blue light from, the preservation performance of vegetables can be enhanced.

  Thus, for example, a limited space in the refrigerator or the like can be selectively used for sterilization and deodorization and improvement of storage performance for vegetables and the like.

In one embodiment,
The plurality of light emitting diodes 12 and 212 are connected with the same polarity between the first electrode and the second electrode.

  According to the embodiment, the plurality of light emitting diodes 12 and 212 are lit at the same time because they are connected with the same polarity between the first electrode and the second electrode.

  For this reason, it is possible to reduce the current input per one light emitting diode 12, 212.

In one embodiment,
The plurality of light emitting diodes 12 are randomly connected between the first electrode and the second electrode without aligning the polarities.

  According to this embodiment, since the plurality of light emitting diodes 12 are randomly connected between the first electrode and the second electrode without aligning the polarities, they can be easily and inexpensively manufactured.

10, 110, 112, 113, 401 Surface light source 11, 40 Substrate 12, 212 Light emitting diode 20 Photocatalyst member 21 Base material 22 Photocatalyst 41 Reflective film 500 Wavelength conversion filter V Ultraviolet light

Claims (5)

A surface light source that emits ultraviolet light and includes a plurality of light emitting diodes mainly composed of an inorganic substance and a substrate, and the plurality of light emitting diodes are distributed in a planar shape on the substrate;
A photocatalyst sterilization deodorizing apparatus comprising: a base material; and a photocatalyst member provided on the surface of the base material and having a photocatalyst irradiated with ultraviolet light from the surface light source. In the photocatalyst sterilization deodorization apparatus according to claim 1,
The photocatalyst sterilization and deodorization apparatus, wherein the surface light source includes a reflective film provided between the substrate and the light emitting diode. In the photocatalyst sterilization deodorization apparatus according to claim 2,
A photocatalyst sterilization deodorizing apparatus, wherein the substrate is a flexible substrate. In the photocatalyst sterilization deodorization apparatus according to any one of claims 1 to 3,
A photocatalyst sterilization deodorizing apparatus comprising a wavelength conversion filter that detachably converts ultraviolet light from the light emitting diode into at least one of orange light and blue light. In the photocatalyst sterilization deodorization apparatus according to any one of claims 1 to 4,
The photocatalyst sterilization and deodorization apparatus, wherein the plurality of light emitting diodes are connected between the first electrode and the second electrode with the same polarity.

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