JP2004330193A - Method and device for generating negative ion by using sunlight in living space - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for generating negative ion by using the sunlight that can conduct an effective discharge of the negative ion for energy saving in a living space. <P>SOLUTION: In the method for generating the negative ion by using the sunlight 6 in the living space 2, optical electricity is discharged by irradiating with sunlight, an optical electricity discharging material 5 installed in a part of the space wherein the the material 5 is irradiated under the electric field and the discharged electricity helps to generate the negative ion in the living space. A blind is installed in a part of the space wherein the material 15 is irradiated and the optical electricity discharging material generating the negative ion by discharging the optical electricity with the irradiation of the sunlight is installed on a surface where the material 15 is irradiated on the shield material of the blind. Electrode material may be installed on a part of a surface opposite to the surface where the optical electricity discharging material of the blind is installed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an energy-saving living space using sunlight, and more particularly, to a method and an apparatus for generating negative ions using sunlight for creating a comfortable space in a private house, a hospital, an office, or the like.

As a conventional technique for obtaining a comfortable living space, a home air purifier that purifies air by dust removal (removal of particulate matter) and deodorization will be described as an example.
The purifier comprises a device that positively charges fine particles by corona discharge under a strong electric field, collects the charged fine particles by using a negatively charged filter, and deodorizes the fine particles by a deodorizing filter using activated carbon. It had been.
In the purifier, the device having the above-described configuration is usually installed on the floor of a living space of a person, and the surrounding air is forcibly ventilated into the purifier by the operation of a fan that is driven by the built-in electric power. Cleaning was going on.

Such a configuration and operation have the following problems.
That is, ozone is generated by corona discharge, and even a very small amount of this ozone is harmful to the human body. In charging by discharging, as the particle diameter becomes smaller, the charging efficiency becomes lower. For example, the collection performance of particles having a particle size of 0.1 μm or less to which a virus has adhered and particulate matter having a size of 0.1 μm or less in cigarette smoke was extremely low, and collection and removal were almost difficult.
In the discharge, fine particles are generated, so that the load on the rear filter increases, and a collecting material having a large collecting capacity is required. Since the deodorizing filter deteriorates rapidly due to the above-mentioned generated ozone (the ozone reacts with the deodorizing filter), there are many disadvantages such as rapid deterioration of performance.
Further, since the purifier is installed on the floor and operated by electric power, a space for human activities is restricted (reduced), and a large amount of electric power needs to be supplied.

The index of the clean air includes positive and negative ions in addition to the fine particles and odor as described above.
It is known that if there are many negative ions, "exhilaration" can be obtained, but in the space where people are active, positive ions are generated and few negative ions are generated. Resulting in). For example, when a fan or a motor rotates, positive ions are generated and negative ions are consumed, so that a space using such a fan has few negative ions (12th Aerosol Science and Technology Research Forum, p120- 122, 1995).
That is, in the method in which the fine particles are positively charged and collected, positive ions increased (negative ions decreased) due to corona discharge and operation of a fan of a power source. For this reason, a practically more effective system has been expected.
On the other hand, the present inventors have proposed a method of irradiating a photoelectron emitting material with ultraviolet rays to charge and collect fine particles using generated photoelectrons.
Although this method was particularly effective in ultra-cleaning work spaces in advanced industries such as the semiconductor, liquid crystal, and precision instrument industries, there is room for improvement so that it can be used according to its purpose depending on the application. Was.
JP-A-63-78471 JP-A-3-258357 12th Aerosol Science and Technology Research Symposium, p120-122 (1995)

  In view of the above prior art, the present invention provides a method and an apparatus for generating negative ions using sunlight, which can effectively remove dust and release negative ions in a living space without generating positive ions without energy. That is the task.

In order to solve the above problems, in the present invention, in a method for generating negative ions using sunlight in a living space, a photoelectron emitting material provided in a part of a space where sunlight is irradiated is irradiated with sunlight. A method for generating negative ions using sunlight in a living space, characterized by emitting photoelectrons and generating negative ions in the living space with the emitted photoelectrons, or a negative ion generator using sunlight in a living space A negative ion generator utilizing sunlight in a living space, wherein a photoelectron emitting material that emits photoelectrons by irradiation of sunlight to generate negative ions is provided in a part of the space where sunlight is irradiated. It is what it was.
In the present invention, the photoelectrons are preferably emitted under an electric field, and an electrode material for the emission can be provided.
Further, in the present invention, in a negative ion generator utilizing sunlight in a living space, a blind is provided in a part of the space where the sunlight is irradiated, and the surface of the blind where the sunlight is irradiated of the light shielding material, A negative ion generator utilizing sunlight in a living space, comprising a photoelectron emitting material that emits photoelectrons by irradiation with sunlight to generate negative ions.
In the above-mentioned device, an electrode material can be provided on a part of a surface opposite to a surface on which the photoelectron emitting material is provided, in the light shielding material of the blind.
Furthermore, in the present invention, a blind for blocking sunlight, wherein the surface of the blind that is irradiated with sunlight emits photoelectrons by irradiation of sunlight to generate negative ions. A negative ion generating blind utilizing sunlight, wherein a photoelectron emitting material is provided, and an electrode material is provided on a part of a surface opposite to the surface on which the photoelectron emitting material is provided.

According to the present invention, the following effects can be obtained.
1) In a living space, by installing a photoelectron emitting material and an electrode material for forming an electric field in the direction of the sun,
(A) Negative ion-rich comfortable air from which particulate matter was collected and removed by sunlight was obtained.
That is, since it can be carried out by using sunlight, negative ion-rich comfortable air from which particulate matter is collected and removed with energy saving is obtained.
(B) Comfortable air can be easily obtained by using sunlight, so that the activity space (space) for humans has been widened. In addition, the power cost only needs to be formed by the electric field, so that it is significantly reduced as compared with the conventional air purifier. In addition, since it is ozone-free and does not generate by-products such as fine particles, it has become a practically effective technology for creating a comfortable living space.

2) In the above-mentioned creation of comfortable air, the concentration of particulate matter in the air is previously reduced to 10 million particles / ft ³ or less,
(A) Negative ions could be effectively generated by photoelectrons generated by irradiating the photoelectron emitting material with sunlight from the air.
When the negative ions according to (b) and (a) were released into the living space where the person was, the person could feel refreshed.
When the air containing negative ions according to (c) and (d) was exposed to foods and plants, the freshness of the foods and plants could be maintained for a long time.
3) Since the above-mentioned comfortable air has been sterilized,
(A) The exhilaration to humans and the effect on the freshness of foods and plants are further increased.
(B) The air became suitable for health.

Hereinafter, the present invention will be described in detail.
According to the present invention, a photoelectron emitting material that emits photoelectrons by irradiating sunlight and an electrode material for setting an electric field are installed at a place where sunlight is irradiated in a living space. It has a collecting part for particulate matter such as (microorganisms) and (2) a part for emitting negative ions to the living space.
That is, the concentration of the particulate matter in the outside air or the room is usually about 100 to 1 billion / ft ³ at the concentration of the particulate matter of 0.1 μm or more. In the present invention, when the amount is set to 10,000,000 pieces / ft ³ or less, or 1,000,000 pieces / ft ³ or less, particularly preferably 100,000 pieces / ft ³ or less, the air becomes fresh and the generation of negative ions becomes effective. Thus, the present invention has been made.

In the particulate matter collection / removal section (1), photoelectrons are generated by irradiating the photoelectron emitting material with sunlight, and the particulate matter is charged by the photoelectrons. It is to collect and remove. In the negative ion emitting section (2), photoelectrons are generated by irradiating the photoelectron emitting material with sunlight, and the photoelectrons emit negative ions into the space. Next, each configuration will be described.
The photoelectron emission material and electric field (electrode material) can be applied to both the trapping / removing part of particulate matter and the generating part of negative ions. The charged fine particle trapping material is applicable to trapping / removal of particulate matter. it can.
The photoelectron emitting material emits photoelectrons when irradiated with sunlight. Therefore, the emission material may be any material that emits photoelectrons by irradiating sunlight, and a material having a small photoelectric work function is preferable, and a material having good workability is practically effective. This is preferred.

The photoelectron emitting material can be used by adding a photoelectron emitting substance to a base material having an appropriate shape. That is, the photoelectron emitting material was a plate-like, pleated, curved, irregular, honeycomb, net-like, linear, fibrous, or screen-like base material to which a photo-emissive material described below was added. Things. These can be determined by appropriate preliminary tests and examinations according to the application destination, device shape, required performance, and the like.
Usually, it is preferable to add a photoelectron-emitting substance to a glass material and to add a photoelectron-emitting substance to an appropriate net-like material (base material) because it is effective in a simple shape.
In addition, it is preferable that at least one type of the photoelectron emitting material is installed between the living space and the outside (wall material) and is used by irradiating it with sunlight, because it is practically advantageous in terms of effect and cost. . As this method, there is a type in which a photoelectron emitting material described later is added to a base material of a light transmitting material.

Any method can be used as long as photoelectrons are emitted by irradiation of sunlight. For example, a method of coating and using on a glass base material, a method of embedding near the surface of the base material as another example, a method of adding on the base material and further coating another material thereon And a method of using a mixture of a light-transmitting substance and a photoelectron-emitting substance.
Examples of the addition method include an ion plating method, a sputtering method, a vapor deposition method, a CVD method, a plating method, a coating method, a stamp printing method, and a screen printing method, which can be appropriately used.
In addition, the addition may be performed as appropriate, such as a method of adding a thin film, a method of adding a net, a line, or a band.

From the viewpoints of effect and economy, the photoemission material is made of Ba, Sr, Ca, Y, Gd, La, Ce, Nd, Th, Pr, Be, Zr, Fe, Ni, Zn, Cu, Ag, Pt, Any one of Cd, Pb, Al, C, Mg, Au, In, Bi, Nb, Si, Ta, Ti, Sn, P or a compound or alloy or a mixture thereof is preferable, and these may be used alone or in combination of two or more. Used in combination. As the composite material, a physical composite material such as amalgam can be used.
For example, the oxide as a compound, boride, there are carbides, _BaO in the _{oxide, SrO, CaO, Y 2 O} 5, Cd 2 O 3, Nd 2 O 3, ThO 2, ZrO 2, Fe 2 O 3 _{, ZnO, CuO, Ag 2 O} , PtO, PbO, Al 2 O 3, MgO, in 2 O 3, BiO, NbO, include BeO, also _YB 5 to _{borides, GdB 6, LaB 6, CeB} 6 , PrB ₆ , ZrB _{2 and the} like, and further, as carbides, there are ZrC, TaC, TiC, NbC and the like.

The light-transmitting substance used as the base material is any as long as it blocks the flow of air from indoor to outdoor, has excellent sunlight permeability, and can add a photoelectron-emitting substance to the surface or near the surface. Can be used. In particular, those having good transmittance of light having a short wavelength (e.g., <400 nm) of sunlight are preferable because they are effective. Usually, a polymer material such as a glass material or an acrylic resin can be suitably used.
As a base material other than the light-transmitting substance, Cu-Zn, SUS, or the like can be used in an appropriate shape such as the mesh, and any material can be used as long as its surface can be coated (added) with the photoelectron-emitting substance. good.
The type of the base material such as the type of the photo-emissive substance, the type of the light-transmitting material, and the addition method can be appropriately determined by examining the application field, economic efficiency, the method of irradiating sunlight, or performing a preliminary test. .

Mesh-like, linear, fibrous, screen-like, and honeycomb-like photoelectron-emitting materials (air-permeable photoelectron-emitting materials) can emit photoelectrons effectively in a weak electric field when air is passed through them. Therefore, it is preferable depending on the shape, structure, requirements, and performance of the application device. It is considered that the reason for having a photoelectron emission effect in a weak electric field is that the air current assists photoemission.
The type and shape of the photoelectron emitting material depends on the method of irradiating sunlight, the purpose (charge / collection of fine particles, emission of negative ions, shape of equipment used, method of applying electric field, structure, desired efficiency, etc.). It can be determined appropriately.
The photoelectron emission material emits photoelectrons effectively when irradiated with sunlight in an electric field. The inventors of the present invention have already proposed photoelectron emission in an electric field (for example, Japanese Patent Publication No. 3-5859 and Japanese Patent Application Laid-Open No. 2-303557).
The electric field can be formed by applying a voltage between the photoelectron emitting material (negative electrode) and the electrode (positive electrode).

The electric field voltage in the present invention is from 0.1 V / cm to 2 kV / cm. That is, in the present invention, an air-permeable photoelectron emitting material can be used as the photoelectron emitting material. In this case, the electric field voltage may be weak, and is effective at 100 V / cm or less, usually 20 V / cm or less. A suitable electric field strength can be determined by appropriate preliminary tests and studies in consideration of the application conditions, apparatus shape, scale, effect, economy, and the like.
For example, in the case where negative ions are emitted outward (outside the space between the photoelectron emitting material and the electrode), if a gas-permeable photoelectron emitting material is used, the electric field strength will be 20 V / cm or less is preferable because a high effect is obtained.
As the electrode material for forming the electric field, a well-known electrode material can be appropriately used. For example, there are a SUS material and a Cu-Zn material.
The electric field electrode material can be used also as an integrated or integrated with a charged fine particle collecting material (dust collecting material) described later.

Any material for collecting charged fine particles (dust collecting material) can be used as long as it can collect charged fine particles. Dust collecting plates, dust collecting electrodes, and various electrode materials for ordinary charging devices and electrostatic filter systems are generally used.However, the collecting part itself, such as a steel wool electrode or a tungsten wool electrode, has a wool-like structure in which the electrodes are configured. Things are also valid. Electrec materials can also be suitably used.
In addition, the method of collection using an ion exchange filter (or fiber) already proposed by the present inventors is also effective (Japanese Patent Publication Nos. 5-9123, JP-A-63-77557, and JP-A-63-84656). ).
In addition to removing particulates, ion-exchange fibers are extremely low concentrations (ppb and below) such as alkaline gases such as ammonia and amines, active gases such as aldehydes, and propionic acid, valeric acid and butyric acid, which are commonly found in dwellings. However, it is effective for collecting and removing body odors that emit a bad odor, and thus is preferable depending on the application destination.

For collection, these collection methods can be used alone or in combination of two or more of these methods.
If the concentration of the particulate matter is 10 million / ft ³ , the details of the reason why the generation of negative ions is effective are unknown, but one reason is that if the concentration of the coexisting particulate matter is large, the photoelectron Is considered to be consumed by the particulate matter.
The negative ion generating section is where the concentration of the particulate matter in the air becomes 10,000,000 particles / ft ³ or less, and the negative ion concentration becomes 3000 / 100,000 particles / ml. Here, generation of negative ions is performed by O ₂ ⁻ (H ₂ O) n, O ⁻ (H ₂ O) n, and OH ⁻ due to electron attachment and clustering of photoelectrons with water molecules or oxygen molecules having high electron affinity. It is considered to form a negative ion cluster such as (H ₂ O) n.

These reactions are shown below.
O ₂ + e → O ₂ ^{-
_{O 2 - + H 2 O →}} O 2 - (H 2 O)
・
・
・
^{_{O 2 - (H 2 O)}} n -1 + H 2 O → O 2 - (H 2 O) n
Generally, there are thousands to tens of thousands of negative ions / ml in a natural waterfall or mountain stream where a refreshing feeling can be obtained. There are only about 100 / ml (Karaki, Suzuki, Tanaka, Transactions of the Society of Air Conditioning and Sanitary Engineers, B-44, p1065-1068, October 1995).
Therefore, in the present invention, the concentration of negative ions in the living space of a person is increased to 3000 to 100,000 / ml by photoelectrons to bring the concentration closer to the natural environment.

Next, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a house provided with a living space of the present invention.
In FIG. 1, a collection / removal unit for collecting / removing particulate matter (dust, pollen, various bacteria, microorganism-containing particles, etc.) 3 in a house 2 which is a living space A where a person 1 lives. B and a negative ion generator C for releasing negative ions into the living space.
The house 2 is contaminated by dust (eg, tobacco smoke, garbage, dust) 3 generated by the daily activities of the person 1 and by intrusion of pollen and various bacteria / microorganism-containing particles 3 from the outside air. In particular, since recent dwellings have high hermeticity (airtightness), the dust 3 generated in the living space A is present near the person 1 and adversely affects health.

These particulate matter 3 is collected and removed in the particulate matter collection and removal section B of the present invention.
That is, the particulate matter 3 is charged by the photoelectrons 8 emitted by irradiating the photoelectron emission material of the present invention, in which the glass plate (window glass) 4 is coated with the photoelectron emission substance 5, with light 7 from the sun 6, It becomes charged particulate matter 9. Next, the charged particulate matter 9 is collected and removed by the charged particulate matter collecting material 10 on the rear side, and the outlet of the collection and removal part B of the particulate matter 3 becomes clean air 11.
Next, the clean air 11 irradiated with the particulate matter 3 is converted into negative ion-rich air 12 in the negative ion generator C of the present invention, and the negative ion-rich clean air 12 is supplied to the living space A. You.

That is, the clean air 11 is a comfortable air 12 rich in negative ions due to photoelectrons 8 emitted by irradiating the photoelectron emitting material of the present invention with the photoelectron emitting material 5 coated on the glass material 4 with light 7 from the sun 6. It becomes.
Reference numeral 13 denotes an electrode material for forming an electric field for efficiently emitting the photoelectrons 8 from the photoelectron emitting material.
In this way, the comfortable air 12 is supplied to the living space A where the person 1 lives. Since this air is rich in negative ions, the living space A provides a relaxed and pleasant feeling as obtained in a forest bath. The reaction mechanism for providing a pleasant sensation by the negative ion-rich air 12 has not been sufficiently elucidated, but is considered as follows. That is, it is considered that the air rich in negative ions enhances the regulation of human autonomic nerves, activates cells, and activates metabolism.

In addition, since the comfortable air 12 is also free of airborne bacteria and microorganisms, it is safe to remove air (prevents contamination of humans from microorganisms, microorganisms, viruses, etc.) as well as sterilized air (removal). Bacteria air).
The arrows in FIG. 1 indicate the flow of air in the house 2 due to the irradiation of sunlight on the photoelectron emission material and the heat generated by human life, and the flow effectively causes the particulate matter 3 in the house 2 to flow. Then, the particulate matter is transported to the collection / removal section B where it is collected and removed, and the comfortable air 12 is effectively transported to the living space A of the person.

FIG. 2 shows a schematic configuration diagram of a house having another living space according to the present invention.
FIG. 2 uses the photoelectron emitting material of the present invention in which the photoelectron emitting material in the negative ion generating section C in FIG. Reference numeral 14 denotes a window glass for irradiating light 7 from the sun 6 to a photoelectron emission material obtained by coating a photoelectron emission material 5 on a reticulated Cu—Zn.
2, the same symbols as those in FIG. 1 have the same meaning.

FIG. 3 shows a schematic configuration diagram of a part of a house having another living space according to the present invention.
In FIG. 3, the collection / removal unit B of the particulate matter 3 and the negative ion generation unit C are integrated into the brand D installed near the window glass 4 through which the light 7 from the sun 6 passes. And supplies the comfort air 12 rich in negative ions, which has been dust-removed (removal of the particulate matter 3), to the living space A.
That is, the light shielding material 14 of the blind is covered with the photoelectron-emitting substance 5, and the photoelectrons 8 emitted by the irradiation of the light 7 from the sun 6 charges the particulate matter 3 to become charged particulate matter. The charged particulate matter is collected by a charged particulate matter collecting material (electrode) 10. Here, the trapping material (electrode) 10 also serves as an electric field forming electrode material for performing photoelectron emission from the photoelectron emitting substance 5 under an electric field.

The emitted photoelectrons 8 mainly act for dust removal in the front, and act for the negative ion air 12 because the particulate matter 3 is mainly removed and clean air is provided in the rear.
In this way, the particulate matter 3 is removed, and the air 12 becomes rich in negative ions and is supplied to the living space A. Thus, the living space A can be relaxed and pleasant.
Reference numeral 15 denotes a part of a living space (room) in the house 2 (FIGS. 1 and 2).
The arrows in FIG. 3 indicate the direction of air flow, and in FIG. 3, the same symbols as those in FIGS.

Hereinafter, the present invention will be described specifically with reference to examples.
Example 1
The model of the house shown in FIG. 1 is made, and the particulate matter trapping / removing unit B by photoelectrons is used to remove suspended particulate matter in the residential space, and the concentration of the particulate matter at the entrance of the negative ion generating unit C is determined. The generated negative ion concentration was examined.
In addition, as an effect of negative ions, strawberry (fruit) was exposed to negative ion-rich air at 5 ° C., and the maintenance of freshness was examined. In addition, as an effect of the negative ion-rich sterilized air, the air was blown onto an agar medium, and the bacteria were cultured and examined.

(1) Size of house; 40m ³
(2) Conditions for the particulate matter collection / removal section (B);
(A) Apparatus size: about 300 liters,
(B) Photoemission material: glass coated with 5 nm of ZrC,
(C) Electric field: Cu-Zn plate, strength 5-50 V / cm,
(D) Charged particulate matter trapping material: plate-shaped Cu-Zn, 500 V / cm,
(3) Conditions for the negative ion generating section (C);
(A) Apparatus size: about 200 liters
(B) Photoemission material: glass coated with 5 nm of ZrC,
(C) Electric field: electrode material Cu-Zn, strength 50 V / cm,
(4) Particulate matter (floating substance in air) concentration measuring device: particle counter
(Light scattering type,> 0.1 μm) (5) Negative ion concentration measuring device: Ion tester

Results (1) By changing the electric field voltage in the particulate matter collection / removal section (B), the particulate matter removal performance in the section B is changed, and the entrance particles to the negative ion generator (C) are changed. The negative ion generation concentration (number / ml) with respect to the concentration of the substance (number / ft ³ ) was examined.
FIG. 4 shows the relationship between the concentration of the generated negative ions with respect to the concentration (parts / ft ³ ) of the particulate matter entering the negative ion generator (C). The measured values show a range because of large variations.
FIG. 5 shows changes in the particulate matter (-● -mark) and the concentration of negative ions (-（-) in the house.
(2) To examine the efficacy of negative ions, strawberries were exposed to 3,000, 10,000 and 50,000 negative ions / ml (all of which are average values) obtained in the present invention, and freshness retention was examined. .
Table 1 shows, as an index of freshness, the number of days in which mold has been observed.

（３）負イオンリッチな除菌空気の効能として、本発明で得られた負イオン空気（１万個／ｍｌ）を寒天培地に吹きつけることにより菌類の培養を行い、同様に光電子の発生が無い場合を行い、比較した。結果は、吹き付けた寒天培地上にはコロニーは発生しなかったが、光電子の発生が無い場合（太陽光の照射及び、電場の形成が無い場合）にはコロニーが２０〜３０個／１０ｃｍ^２発生した。
また、生活空間Ａにおいて、オゾン（Ｏ_３）濃度を測定したところ、本発明の装置によるＯ_３ 発生（Ｏ_３濃度の増加）は認められなかった。

(3) As an effect of the sterilized air rich in negative ions, fungi are cultured by spraying the negative ion air (10,000 cells / ml) obtained in the present invention onto an agar medium, and the generation of photoelectrons is also reduced. The case without it was performed and compared. As a result, no colonies were generated on the sprayed agar medium, but 20 to 30 colonies / 10 cm ² were generated when no photoelectrons were generated (when there was no irradiation of sunlight and no electric field was formed). did.
In addition, when the ozone (O ₃ ) concentration was measured in the living space A, O ₃ generation (increase in the O ₃ concentration) by the apparatus of the present invention was not observed.

The schematic block diagram of the dwelling provided with the living space of this invention. The schematic block diagram of the dwelling provided with another living space of this invention. The schematic block diagram of a part of the dwelling provided with other living space of the present invention. 5 is a graph showing the relationship between the concentration of particulate matter and the concentration of negative ions. 5 is a graph showing changes in particulate matter concentration and negative ion concentration with time.

Explanation of reference numerals

  1: person, 2: house, 3: particulate matter, 4: glass plate, 5: photoemissive substance, 6: sun, 7: light ray, 8: photoelectron, 9: charged particulate matter, 10: charged particulate matter Material trapping material, 11: clean air, 12: negative ion-rich air, 13: electrode material, 14: net-like photoelectron emitting material, 15: part of house (room), A: living space, B: particulate Material collection / removal section, C: negative ion generation section, D: brand

Claims (7)

  In a method for generating negative ions utilizing sunlight in a living space, a photoelectron emitting material provided in a part of a space to be irradiated with sunlight is irradiated with sunlight to emit photoelectrons, and the emitted photoelectrons emit the photoelectrons. A method for generating negative ions using sunlight in a living space, wherein negative ions are generated in a space.   The method according to claim 1, wherein the photoelectrons are emitted in an electric field. A negative ion generator using sunlight in a living space is characterized in that a photoelectron emitting material that emits photoelectrons and generates negative ions by irradiating sunlight is provided in a part of the space where sunlight is irradiated. Negative ion generator using sunlight in living space.   The negative ion generator according to claim 3, wherein an electrode material for emitting photoelectrons under an electric field is installed in a part of the space.   In a negative ion generator utilizing sunlight in a living space, a blind is provided in a part of the space where sunlight is irradiated, and a photoelectron is irradiated on a surface of the blind, which is irradiated with sunlight, by a photoelectron. A negative ion generator using sunlight in a living space, comprising a photoelectron emitting material that emits negative ions to generate negative ions.   The negative ion generator according to claim 5, wherein an electrode material is provided on a part of a surface opposite to a surface on which a photoelectron emitting material is provided, on the light blocking material of the blind.   A blind for shielding sunlight, and a photoelectron emission material that emits photoelectrons by irradiation of sunlight to generate negative ions is provided on a surface of the blind where the sunlight is irradiated. A negative ion generating blind utilizing sunlight, wherein an electrode material is provided on a part of a surface opposite to a surface on which the photoelectron emitting material is provided.

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