JP2023122579A - LED lighting device - Google Patents

Abstract

To provide an LED lighting device capable of emitting, as illumination light, pseudo white light that includes, as components, visible light having microbial inactivation effects, capable of being manufactured at lower cost than before, and having almost no need to take care to avoid harm caused by the visible light when an installation site is selected.SOLUTION: An LED lighting device includes a housing having a connection 30 and an emitting surface 29 of illumination light, and an LED light source 24 installed inside the housing. The output light of the LED light source 24 is pseudo white light including, as components, visible light having microbial inactivation effects, and has not a peak wavelength other than the peak wavelength of the visible light in a visible light region. The illumination light is pseudo white light produced by mixing the output light in the housing, and configured to be used, in the presence of main illumination light for illuminating a desired object space, as auxiliary illumination light of the main illumination light. An optical lens 23 focusing the output light to emit, as the illumination light, from the emitting surface 29 may be included inside the housing.SELECTED DRAWING: Figure 3

Description

The present invention relates to a lighting device using LEDs (Light-Emitting Diodes), and more specifically, pseudo-white light containing visible light as a component that has the effect of inactivating microorganisms such as bacteria and viruses. The present invention relates to an LED lighting device using one or a plurality of emitting LEDs as a light source.

It has been known for a long time that ultraviolet light has a bactericidal effect, but it has the drawback that ultraviolet light is harmful to the human body and cannot be used in places where there are people. However, it was later discovered that blue-violet light (violet light) with a peak wavelength of 405 nm in the visible light region also has the effect of inactivating microorganisms such as bacteria.

For example, in Non-Patent Document 1, by irradiating high-intensity light (visible light) with a peak wavelength of 405 nm generated from an array of light-emitting diodes, Salmonella, Shigella, Escherichia, Listeria, and Mycobacteria It has been reported that taxonomically diverse bacterial pathogens of the genus Pseudomonas have been inactivated.

In Non-Patent Document 2, by irradiating light (visible light) with a peak wavelength of 405 nm generated from an array of light-emitting diodes, Gram-positive bacteria (Staphylococcus, Streptococcus, etc.) and Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa) etc.) have been reported to be inactivated.

According to the above two reports, bacteria can be inactivated by irradiating blue-violet light with a peak wavelength of 405 nm in the visible region. It became clear that there is Unlike ultraviolet light, blue-violet light with a peak wavelength of 405 nm is harmless to the human body and can be used even in the presence of people. Various LED lighting devices have been developed and proposed.

For example, Patent Document 1 discloses a lighting fixture with an LED structure that functions as a white light source that is not harmful or uncomfortable to humans and that enables disinfection. The LED structure comprises a substrate, a light-emitting region defined as a cavity on the substrate, at least two light-emitting semiconductor sources having bactericidal and antibacterial properties mounted in the cavity, and the at least two and a wavelength converting material layer formed on top of the light emitting semiconductor source as caused by the light emitting semiconductor source. both of the at least two light emitting semiconductor sources actuate the wavelength converting material to produce white light, at least one of the light emitting semiconductor sources above the wavelength of ultraviolet light and below 410 nm; Preferably, it has an emission with a peak wavelength of approximately 405 nm and the full width at half maximum of said emission is below 30 nm (summary, see claims 1 and 16, figures 1 to 9).

In the above-described lighting fixture of Patent Document 1, for example, the ratio (A/B) of the intensity A of the luminescence with a peak wavelength of 405 nm and the intensity B of the luminescence with a peak wavelength of 450 nm, which has a disinfection effect, is controlled by two independent driving currents. By adjusting with (a) (A/B) can be increased when no people are present to maximize disinfection action with zero white light, and (b) when people are present can reduce (A/B), maximizing the white light intensity while keeping the disinfecting effect to a minimum. Therefore, it is possible to adjust the deactivation action of bacteria and viruses according to the surrounding situation (that is, the presence or absence of people) while functioning as a white light lighting fixture (paragraphs 0041 to 0042). reference). It is understood that the reason why the intensity of the luminescence with the peak wavelength of 405 nm is kept low in the presence of people is to suppress the influence of the disinfection effect of the luminescence with the peak wavelength of 405 nm on people.

The above-mentioned US Pat. No. 6,200,103 further states that although the germicidal effect of blue/violet light is less than that of ultraviolet light, blue/violet light can be exploited in continuously operating disinfecting lights, and that the peak wavelength Light at 405 nm is well known to induce the generation of reactive oxygen species (ROS) in cells, and these negatively charged oxygen ions can effectively suppress bacterial colony growth, for example. , are described (see paragraph 0003). Further, the integrated LED structure disclosed in the document is also described to provide bactericidal, antibacterial, antiviral (bactericidal), antiseptic with antiviral effects, and photosynthetic effects. (see paragraph 0036).

In addition, the lighting fixture of Patent Document 1 described above emits white light that is not harmful to humans and does not cause discomfort, and simultaneously emits light with a peak wavelength of approximately 405 nm, which has a disinfection effect. However, the above-mentioned Patent Literature 1 does not disclose any specific configuration of the lighting fixture.

Patent Document 2 discloses a lighting device including a plurality of light emitting devices, each of which emits light specified by a spectrum having a peak wavelength in a wavelength region of 360 nm or more and 430 nm or less. and a wavelength conversion member that converts at least part of the light emitted by the light emitting element into light specified by a spectrum having a peak wavelength in a wavelength range of 360 nm or more and 780 nm or less, wherein the light emitting element emits It is disclosed that illumination light that is a combination of the light that has not been converted by the wavelength conversion member and the light that has been converted by the wavelength conversion member is emitted. In the illumination light, the total energy of light having a wavelength included in a wavelength range of 360 nm or more and 430 nm or less is 3 times the total energy of light having a wavelength included in a wavelength range of 360 nm or more and 780 nm or less. % or more and 18% or less. (Claim 11, see FIGS. 1 to 8).

"The total energy of light having a wavelength included in the wavelength range of 360 nm or more and 430 nm or less is 3% or more and 18% of the total energy of light having a wavelength included in the wavelength range of 360 nm or more and 780 nm or less. % or less” is understood to be to avoid adverse effects of the former light on the human body (especially the eyes) by keeping the emission intensity of the former light lower than that of the latter.

In the lighting device of Patent Document 2 described above, as described above, the illumination light is the light converted from the excitation light by the wavelength conversion member, and the wavelength conversion member out of the excitation light. It is said that it consists of light that is emitted as it is without being converted by In addition, since the intensity of violet light in the illumination light (purple light has an antibacterial effect and does not easily affect the human body) can be increased, an antibacterial effect based on the violet light can be realized, and the illumination light It is said that the color rendering properties of (See paragraphs 0011-0012).

In the above-mentioned Patent Document 2, examples of bacteria that exert the antibacterial effect of violet light include bacteria such as Staphylococcus aureus, drug-resistant Staphylococcus aureus, Salmonella, Shigella, Legionella, and Bacillus cereus, viruses such as norovirus, Molds such as red mold, aspergillus niger or raccoon are mentioned (see paragraph 0057).

In addition, in the above-mentioned Patent Document 2, as the configuration of the lighting device, there is a linear light emission lighting in which a plurality of light emitting devices are arranged in a straight line inside the housing, and a plurality of light emitting devices are arranged in a matrix inside the housing. Alternatively, surface-emitting illumination arranged in a houndstooth pattern is only schematically disclosed by means of conceptual diagrams, and the specific configuration of the illumination device is not disclosed.

Japanese Patent Publication No. 2020-505787 WO2020/045665

Lynne E. Murdoch et al., Bactericidal Effects of 405nm Light Exposure Demonstrated by Inactivation of Escherichia, Salmonella, Shigella, Listeria, and Mycobacterium Species in Liquid Suspensions and on Exposed Surfaces, The Scientific World Journal, Volume 2012, Article ID 137805, 8 pages, doi:10.1100/2012/137805 Michelle Maclean et al., Inactivation of Bacterial Pathogens following exposure to Light from a 405-Nanometer Light-Emitting Diode Array, Applied Environmental Microbiology, 2009 April, 75(7), 1932-1937, doi: 10.1128/AEM.01892-08

By the way, in the lighting fixture of the above-mentioned Patent Document 1, in short, in the LED structure, the wavelength conversion material is excited by both of the at least two light emitting semiconductor sources to generate white light, and generates blue-violet light with a peak wavelength of 405 nm, which has an effect of inactivating microorganisms such as bacteria and viruses (hereinafter simply referred to as a microorganism deactivating effect). By configuring the LED structure as described above, it is possible to generate a white light as illumination light and to exhibit a disinfecting action in the irradiation area of the white light.

If the lighting fixture of Patent Document 1 described above is configured so that the ratio between the intensity of light emission at a peak wavelength of 405 nm and the intensity of light emission at 450 nm, which has a microbial inactivation effect, can be adjusted, it will function as a white light lighting fixture. However, depending on the surrounding conditions (that is, the presence or absence of people), the microbial inactivation effect can be adjusted. This is to prevent harmful effects on human skin and eyes, or human health in general, by keeping it low (see paragraph 0052). In a configuration in which the microbial inactivation action cannot be adjusted, it is necessary to set the intensity of the emission at the peak wavelength of 405 nm lower than the intensity of the white light, considering the use in the presence of people.

In addition, in the lighting device of Patent Document 2 described above, in short, in each of the plurality of light emitting devices, the light emitting element emits light with a peak wavelength of 405 nm having a microbial inactivation effect, and the wavelength conversion member emits light having a peak wavelength of 405 nm. At least part of the light emitted by the light emitting element is converted into light with a peak wavelength of 360 nm or more and 780 nm or less and emitted. The light having a peak wavelength of 405 nm emitted by the light emitting element (not converted by the wavelength conversion member) and the light having a peak wavelength of 360 nm or more and 780 nm or less emitted by the wavelength conversion member are mixed to obtain the It is emitted as illumination light. The total energy of light with a peak wavelength of 405 nm is limited to 3% or more and 18% or less of the total energy of light with a peak wavelength of 360 nm or more and 780 nm or less. In order to suppress the microbial inactivation effect of the light with a peak wavelength of 405 nm and prevent harmful effects on human skin and eyes, or on general human health, as in the lighting fixture of Patent Document 1 is.

As described above, both the above-mentioned lighting fixture of Patent Document 1 and the lighting device of Patent Document 2 are based on the technical idea of (i) a white light containing blue-violet light with a peak wavelength of 405 nm as a component Light or pseudo-white light is generated as illumination light of the lighting fixture or the lighting device, and (ii) the intensity of the blue-violet light with a peak wavelength of 405 nm having a microorganism inactivation effect is applied to human skin and eyes. or to a level that does not have a detrimental effect on human health in general.

For this reason, in the lighting fixture of Patent Document 1 described above, the LED structure is inevitably complicated, and as a result, the manufacturing cost of the LED structure as a light source increases. In addition, since the luminous flux of the output light of the sample of the LED structure is about 25 lm (lumen), in order to produce the lighting fixture of Patent Document 1 and exhibit the microbial inactivation effect by emitting light with a peak wavelength of 405 nm, requires the combined use of multiple said LED structures. Therefore, there is a problem that the manufacturing cost of the lighting fixture is inevitably increased. Further, the luminaire is designed such that combining multiple said LED structures to enhance the microbial deactivation by emitting light with a peak wavelength of 405 nm does not cause any detrimental effects on human skin and eyes, or on human health in general. It is also necessary to pay attention to the place where the is installed.

Furthermore, the lighting fixture of Patent Document 1 described above is configured so that the ratio between the intensity of light emission with a peak wavelength of 405 nm and the intensity of light emission with a peak wavelength of 450 nm, which has a microbial inactivation effect, can be adjusted. (i.e., the presence or absence of a person), if the microbial inactivation action is to be automatically adjusted, a motion sensor and a circuit for controlling the driving circuit of the LED structure are further required. The cost of manufacturing the luminaire is even higher.

In the lighting device of Patent Document 2, the structure of the light emitting device is inevitably complicated, as in the lighting fixture of Patent Document 1, and as a result, the manufacturing cost of the light emitting device as a light source increases. In addition, the irradiance of the output light of the light emitting device is less than 10 W/m ² , and the illuminance of the lighting device is set at, for example, 100,000 lux (lx) in the test to confirm the antibacterial effect. Therefore, in order to manufacture the lighting device of Patent Document 2 and exhibit the microbial inactivation effect by light emission with a peak wavelength of 405 nm, it is necessary to use a combination of a large number of the light emitting devices including LEDs. Therefore, there is a problem that the manufacturing cost of the lighting device inevitably increases. Furthermore, when a large number of the light-emitting devices including LEDs are combined to enhance the microbial inactivation effect by emitting light having a peak wavelength of 405 nm, it is necessary to prevent adverse effects on human skin and eyes, or on human health in general. It also becomes necessary to pay attention to the place where the lighting device is installed.

The present invention has been made in consideration of the above circumstances, and the purpose thereof is to provide visible light (for example, Pseudo-white light containing blue-violet light with a peak wavelength of approximately 405 nm as a component can be emitted as illumination light, and can be manufactured at a lower cost than the lighting fixture of Patent Document 1 and the lighting device of Patent Document 2 described above. In addition, when selecting an installation site, there is almost no need to take care not to cause harmful effects on human skin and eyes, or on human health in general, due to the visible light. to provide.

Another object of the present invention is to use visible light (e.g., blue-violet light with a peak wavelength of approximately 405 nm) having a microorganism-inactivating effect as a component on the premise that the main lighting device is installed when selecting an installation location. It is an object of the present invention to provide an LED lighting device capable of suitably (effectively) using pseudo-white light containing white light as auxiliary light for main illumination light emitted by the main lighting device.

Still another object of the present invention is to provide visible light (e.g., blue-violet light with a peak wavelength of approximately 405 nm) having a microorganism-inactivating effect contained as a component in pseudo-white light as illumination light after installation at a desired installation location. ) is to provide an LED lighting device that does not have a harmful effect on human skin and eyes, or on human health in general.

Further objects of the present invention not specified herein will be apparent from the following description and accompanying drawings.

(1) The LED lighting device according to the first aspect of the present invention is
a housing having an emission surface for illumination light;
one or more LED light sources disposed inside the housing;
an LED drive circuit that drives the one or more LED light sources;
an optical lens arranged inside the housing for condensing the output light output by the one or more LED light sources and emitting the illumination light from the emission surface to the outside of the housing;
The output light is quasi-white light that contains, as a component, visible light that has the effect of inactivating microorganisms such as bacteria and viruses, and that does not have a peak wavelength in the visible light region other than the peak wavelength of the visible light. ,
the illumination light emitted from the emission surface to the outside of the housing is pseudo-white light generated by condensing the output light with the optical lens;
The illumination light is configured to be used as auxiliary illumination light for the main illumination light in the presence of the main illumination light for illuminating a desired target space. .

In the LED lighting device according to the first aspect of the present invention, as described above, the output light emitted from the one or more LED light sources arranged inside the housing is designed to kill microorganisms such as bacteria and viruses. The pseudo-white light includes visible light having an activating action (microbial inactivating action) as a component, and does not have a peak wavelength in the visible light region other than the peak wavelength of the visible light, and The illumination light emitted from the surface to the outside of the housing is pseudo-white light generated by condensing the output light by the optical lens. The illumination light is used as auxiliary illumination light for the main illumination light in the presence of the main illumination light for illuminating the desired target space. Therefore, it is not necessary to increase the intensity of the output light emitted from the one or more LED light sources. This means that the one or more LED light sources need not be constructed using so-called power LEDs. In addition, the power LED is an LED that is driven by a larger current than a general LED (for example, a current that is 10 times or more that of a general LED) and has a higher luminance than a general LED, and has a heat dissipation structure. . The driving current of a general LED is about several mA to several tens of mA, but the power LED has several hundred mA or more, and correspondingly has high brightness.

The LEDs used in the lighting fixture of Patent Literature 1 mentioned above are clearly power LEDs, since their drive current is several hundred mA (see paragraph 0042). Moreover, a dedicated structure and function as described above are required. Therefore, the manufacturing cost is inevitably high. Although there is no description of the drive current for the LED used as the light-emitting device in the lighting device of Patent Document 2, the lighting device obtained an illuminance of 100,000 lux (lx), which is equivalent to the light intensity of an operating lamp. (see paragraphs 0060 and 0073), it is presumed to be a power LED. Moreover, a dedicated structure and function as described above are required. Therefore, this also inevitably increases the manufacturing cost. On the other hand, the LED light source used in the LED lighting device according to the first aspect of the present invention is a general LED if the output light contains visible light having a microorganism-inactivating effect as a component. Since it can be realized by using, the manufacturing cost is low. Therefore, the LED lighting device according to the first aspect of the present invention can be manufactured at a lower cost than the lighting fixture of Patent Document 1 and the lighting device of Patent Document 2 described above.

In addition, the output light of the LED light source composed of general LEDs instead of power LEDs contains the visible light having a microbial inactivation effect as a component, and has a peak wavelength other than the peak wavelength of the visible light. Although it is a pseudo-white light that does not have in the visible light region, the intensity of the visible light that has the effect of inactivating microorganisms is the same visible light used in the above-mentioned lighting fixture of Patent Document 1 and the above-mentioned Much lower than similar visible light intensities used in the illumination device of US Pat. Moreover, the pseudo-white light as the illumination light generated by condensing the pseudo-white light as the output light by the optical lens can be generated in the presence of the main illumination light for illuminating the desired target space. , to be used as auxiliary illumination light for the main illumination light.

Therefore, when choosing an installation site, little care needs to be taken to ensure that said visible light does not cause harmful effects on human skin and eyes, or on human health in general. Moreover, at the time of selecting the installation location, on the premise that the main lighting device is installed, the pseudo-white light containing the visible light that has the effect of inactivating microorganisms as a component is used as the main lighting device that emits the pseudo-white light. It can be suitably (effectively) used as auxiliary light for light. Furthermore, after installation at a desired installation location, the visible light having a microorganism-inactivating action contained as a component in the pseudo-white light as illumination light is harmful to human skin and eyes, or to human health in general. No fear of it having any effect.

(2) The LED lighting device according to the second aspect of the present invention is
a housing having an emission surface for illumination light;
one or more LED light sources disposed inside the housing;
and an LED drive circuit that drives the one or more LED light sources,
The output light is quasi-white light that contains, as a component, visible light that has the effect of inactivating microorganisms such as bacteria and viruses, and that does not have a peak wavelength in the visible light region other than the peak wavelength of the visible light. ,
the illumination light emitted from the emission surface to the outside of the housing is pseudo-white light generated by mixing the output light within the housing;
The illumination light is configured to be used as auxiliary illumination light for the main illumination light in the presence of the main illumination light for illuminating a desired target space. .

The LED lighting device according to the second aspect of the present invention corresponds to the above-described LED lighting device according to the first aspect of the present invention, in which the optical lens arranged inside the housing is omitted. Therefore, in the LED lighting device according to the first aspect of the present invention, the illumination light emitted from the emission surface to the outside of the housing is transmitted from the output light emitted from the one or more LED light sources to the optical lens. However, in the LED lighting device according to the second aspect of the present invention, the output light output from the one or more LED light sources is mixed in the housing. The difference is that it is assumed to be pseudo-white light generated by Other than this point, it is the same as the LED lighting device according to the first aspect of the present invention. Therefore, it is clear that the LED lighting device according to the second aspect of the present invention can also achieve the above-mentioned three objects in the same manner as the LED lighting device according to the first aspect of the present invention.

(3) In a preferred example of the LED lighting device according to the first aspect of the present invention, the optical lens has a shape in which a plurality of substantially identically shaped lens elements are connected to each other with a single connecting portion,
The plurality of output lights from the plurality of LED light sources respectively pass through both the plurality of lens elements and the connecting portion and reach the exit surface, and the portion where only the plurality of lens elements pass and the above The portion reaching the exit surface is configured to be mixed and condensed with each other and then emitted from the exit surface to the outside of the housing.

(4) In another preferable example of the LED lighting device according to the first aspect of the present invention, the housing has a connection part fixed at one end and a beam sphere type or a light bulb type with the emission surface formed at the other end. is configured as
The pseudo-white light as the illumination light is configured to be emitted from the emission surface in the form of a beam or radially.

(5) In still another preferred example of the LED lighting device according to the first aspect of the present invention, the maximum luminous intensity of the pseudo-white light as the illumination light is set to 2000 cd or less.

(6) In still another preferred example of the LED lighting device according to the first aspect of the present invention, the total luminous flux of the pseudo-white light as the illumination light is set to 1300 lm or less.

(7) In still another preferred example of the LED lighting device according to the first aspect of the present invention, the visible light is light having a peak wavelength in the range of 400 nm or more and 410 nm or less.

(8) In still another preferred example of the LED lighting device according to the first aspect of the present invention, the visible light is blue-violet light having a peak wavelength of approximately 405 nm.

(9) In a preferred example of the LED lighting device according to the second aspect of the present invention, the housing is configured as a fluorescent lamp type (for example, a straight tube type, a circular tube type, or a light bulb type),
The pseudo-white light as the illumination light is configured to be radially emitted from the emission surface.

(10) In another preferable example of the LED lighting device according to the second aspect of the present invention, the maximum luminous intensity of the pseudo-white light as the illumination light is set to 2800 cd or less.

(11) In another preferable example of the LED lighting device according to the second aspect of the present invention, the maximum luminous intensity of the pseudo-white light as the illumination light is set to 2000 cd or less.

(12) In still another preferred example of the LED lighting device according to the second aspect of the present invention, the total luminous flux of the pseudo-white light as the illumination light is set to 3500 lm or less.

(13) In still another preferred example of the LED lighting device according to the second aspect of the present invention, the total luminous flux of the pseudo-white light as the illumination light is set to 1500 lm or less.

(14) In still another preferred example of the LED lighting device according to the second aspect of the present invention, the visible light is light having a peak wavelength in the range of 400 nm or more and 410 nm or less.

(15) In still another preferred example of the LED lighting device according to the second aspect of the present invention, the visible light is blue-violet light having a peak wavelength of approximately 405 nm.

(16) In still another preferred example of the LED lighting device according to the first aspect of the present invention and the LED lighting device according to the second aspect of the present invention, the illumination light is the illumination light for illuminating the target space. When used as the auxiliary illumination light in the presence of the main illumination light, the illumination distance of the illumination light to the illumination surface so that the illuminance of the illumination surface specified in the target space is 5000 lx or less. is set.

In the LED lighting device according to the first aspect of the present invention and the LED lighting device according to the second aspect of the present invention, (a) having an action of inactivating microorganisms such as bacteria and viruses (microorganism inactivating action) Pseudo-white light containing visible light (for example, blue-violet light with a peak wavelength of approximately 405 nm) as a component can be emitted as illumination light, and is more efficient than the lighting fixture of Patent Document 1 and the lighting device of Patent Document 2 described above. It can be manufactured at a low cost, and little care needs to be taken when selecting an installation site to ensure that said visible light does not cause harmful effects on human skin and eyes, or on human health in general. , (b) Pseudo-white light containing visible light (e.g., blue-violet light with a peak wavelength of approximately 405 nm) having a microorganism-inactivating effect as a component, assuming that the main lighting device is installed when selecting an installation location can be suitably (effectively) used as auxiliary light for the main illumination light emitted by the main lighting device; Visible light (e.g., blue-violet light with a peak wavelength of approximately 405 nm) that has a microbial inactivation effect contained as has no risk of having a harmful effect on human skin and eyes, or on human health in general. be done.

1 is a front view showing the outline of an LED lighting device according to an embodiment of the present invention; FIG. FIG. 2 is a bottom view of the LED lighting device according to the embodiment shown in FIG. 1; FIG. 5 is a cross-sectional view taken along line AA in FIG. 4, showing the internal structure of the LED lighting device according to the embodiment shown in FIG. 1; 2 is a bottom explanatory view showing the layout of LED light sources on the emission surface of the LED lighting device according to the embodiment shown in FIG. 1. FIG. FIG. 2 is an enlarged explanatory view showing the structure of an LED light source incorporated in the LED lighting device according to the embodiment shown in FIG. 1; (a) is a bottom explanatory view showing the configuration of an optical lens on the output surface of the LED lighting device according to the present embodiment shown in FIG. 1, and (b) is a cross-sectional view taken along line BB of (a). . 2 is a table showing the results of an effect confirmation test of the LED lighting device according to the embodiment shown in FIG. 1; It is a photograph showing the results of the effect confirmation test of the LED lighting device according to the present embodiment shown in FIG. Shows the colony image of Staphylococcus aureus when irradiated for a period of time and when irradiated for 24 hours, and (B) is irradiated for 7 hours when the illumination light (8000 lx) of the LED lighting device (type 1) is not irradiated. and Pseudomonas aeruginosa colony images when irradiated for 24 hours. It is a photograph showing the results of the effect confirmation test of the LED lighting device according to the present embodiment shown in FIG. Shows a colony image of Staphylococcus aureus when irradiated for a period of time and when irradiated for 24 hours, and (B) is irradiated for 7 hours when the illumination light (1800 lx) of the LED lighting device (type 2) is not irradiated. and Pseudomonas aeruginosa colony images when irradiated for 24 hours. It is a table|surface which shows the result of the effect confirmation test of the conventional LED lighting apparatus (it emits an ultraviolet light) as a comparative example. FIG. 10 is a photograph showing the results of an effect confirmation test of a conventional LED lighting device (ultraviolet light emission) as a comparative example shown in FIG. In the case of , shows the colony image of E. coli when irradiated for 1 minute and when irradiated for 3 minutes, (B) is when the illumination light (ultraviolet light) of the LED lighting device is not irradiated, and when irradiated for 1 minute , and a colony image of Staphylococcus aureus when irradiated for 3 minutes. FIG. 11 is a photograph showing the results of an effect confirmation test of a conventional LED lighting device (ultraviolet light emission) as a comparative example shown in FIG. Colony images of Pseudomonas aeruginosa when irradiated for 1 minute and when irradiated for 3 minutes are shown. FIG. 2 is a spectrum diagram showing an example of emission spectrum of output light from an LED light source incorporated in the LED lighting device according to the present embodiment shown in FIG. 1; FIG. 2 is a conceptual diagram showing a test method for an additional effect confirmation test of the LED lighting device according to the present embodiment shown in FIG. 1, and shows a state of a virus adhesion test carrier used in the test. It is a photograph which shows the test method of the additional effect confirmation test of the LED lighting apparatus which concerns on this embodiment shown in FIG. 1, and shows the test system used by the said test. 1. It is a photograph showing the test method of the additional effect confirmation test of the LED lighting device according to the present embodiment shown in FIG. shows the instrument. It is a table|surface which shows the test result of the additional effect confirmation test of the LED lighting apparatus which concerns on this embodiment shown in FIG. 1, and shows the inactivation effect with respect to the coronavirus of the illumination light of the same apparatus. FIG. 1 is a table showing the test results of an additional effect confirmation test of the LED lighting device according to the present embodiment shown in FIG. ing.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

(Configuration of LED lighting device)
An LED illumination device 1 according to an embodiment of the present invention is configured as a so-called spherical beam type, as shown in FIGS. 1 to 6. FIG. As clearly shown in FIGS. 1 and 3, the LED lighting device 1 includes a drive circuit housing portion 10, a lens mounting portion 20 connected to the lower end of the drive circuit housing portion 10, and a and a connecting portion 30 connected thereto. The drive circuit accommodating portion 10 and the lens mounting portion 20 constitute a housing, and therefore the connecting portion 30 can be said to be connected to one end (here, the upper end) of the housing.

In FIGS. 1 and 3, the drive circuit accommodating portion 10 and the lens mounting portion 20 as a whole have a bell shape. More specifically, the combined body of the drive circuit accommodating portion 10 and the lens mounting portion 20 has a substantially truncated cone shape with an outer diameter gradually increasing from the upper end to the lower end. A lower end surface (bottom surface) of the lens mounting portion 20 has the largest outer diameter, and an emission surface 29 from which the illumination light of the illumination device 1 is emitted is formed on the bottom surface. The exit surface 29 is arranged at the end (lower end in FIG. 3) opposite to the end (upper end in FIG. 3) where the connecting portion 30 is formed. Although the emission surface 29 is substantially flat here, it is not limited to this. For example, it may be convex spherical.

Illumination light from the LED lighting device 1 is emitted from the emission surface 29 in a direction substantially orthogonal thereto (substantially vertically downward in FIGS. 1 and 3), as indicated by an arrow in FIG. The emitted illumination light is in the form of a beam and is therefore suitable for spot illumination, for example.

The connecting portion 30 is formed from a metal base 31 (for example, an E26 base), similar to well-known LED light bulbs and beam bulbs. By screwing the spiral groove on the outer periphery of the base 31 of the connection part 30 into the spiral groove on the inner periphery of the socket (not shown) of the lighting fixture, the mounting of the LED lighting device 1 is completed, and the LED lighting device 1 is ready for use. Also, by twisting the LED lighting device 1 in the opposite direction, it can be easily removed from the socket. In addition, when the shape of the housing is linear, circular, or bulb-like, which is similar to a straight tube type, a circular tube type, or a light bulb type fluorescent lamp, the connection portion 30 is a well-known connection terminal of a fluorescent lamp. It goes without saying that it is formed from

The drive circuit accommodating portion 10 has an outer shell 11 forming an upper portion of the overall bell-shaped shape. The outer shell 11 is made of synthetic resin here. The outer shell 11 has a substantially cylindrical outer wall 11a, and the outside of the outer wall 11a forms a lattice-like portion 11b in order to facilitate air flow and improve heat radiation efficiency. A substantially cylindrical circuit board receiving chamber 12 is formed inside the outer wall 11a. A circuit board 13 having an LED driving circuit (not shown) mounted on its surface is arranged inside the circuit board housing chamber 12 . As the LED drive circuit, the circuit configuration described in Japanese Patent No. 4630930 owned by the applicant of the present application is used here, but it goes without saying that other circuit configurations may be used.

The circuit configuration described in Japanese Patent No. 4630930 mentioned above has a pair of input terminals and a rectified AC voltage input through the pair of input terminals. Between a rectifier circuit that generates an output voltage, a resistive circuit element having one end connected to one of the pair of input terminals and the other end connected to one input terminal of the rectifier circuit, and the output terminal of the rectifier circuit and a transformerless controller that controls the rectified output voltage by PWM switching to generate a drive voltage for driving an LED, wherein the resistance value of the resistive circuit element and the An LED characterized in that a time constant determined by a capacitance value of a capacitive circuit element is set so that the charging period of the capacitive circuit element is longer than when the resistive circuit element is not connected. It is the drive circuit. According to this LED driving circuit, (a) it is possible to improve the power factor and prevent the inrush current at the time of lighting with a smaller number of parts than the conventional one, and furthermore, it is possible to reduce the size of the LED lamp to a feasible level. (b) A compact and bright bulb-type lighting fixture (for example, an LED lamp) can be easily realized.

The upper end of the circuit board housing chamber 12 (outer wall 11 a ) is open and communicates with the inner upper end of the base 31 of the connecting portion 30 . Therefore, the LED drive circuit is connected to the base 31 of the connection portion 30 via a pair of cords 14 extending from the circuit board 13 inside the circuit board housing chamber 12 to the inner upper end of the base 31 of the connection portion 30. electrically connected.

The lower end of the circuit board accommodation chamber 12 (outer wall 11a) is located near the boundary between the drive circuit accommodation portion 10 and the lens mounting portion 20 and is open. This opening is closed by a lid 15 made of a metal disk. Therefore, it can also be said that the drive circuit accommodating portion 10 and the lens mounting portion 20 are separated by the plate-like lid 15 . A pair of cords 26 whose upper ends are connected to the circuit board 13 inside the circuit board accommodation chamber 12 are drawn downward from the opening at the lower end of the circuit board accommodation chamber 12 . Therefore, the opening at the lower end of the circuit board housing chamber 12 is closed by the lid 15 except for the small holes in the lid 15 through which the pair of cords 26 are inserted.

The lower ends of a pair of cords 26 extending downward through the lid 15 from the circuit board housing chamber 12 are connected to the circuits on the LED mounting board 25 (described later) arranged inside the lens mounting portion 20 . It is electrically connected to a plurality of LED light sources 24 mounted on the LED mounting substrate 25 via (wiring) patterns (not shown). In this way, the plurality of LED light sources 24 on the LED mounting board 25 are used as light sources, and are connected via a pair of cords 26 to the circuit board 13 inside the drive circuit housing section 10 . It is electrically connected to an LED driving circuit (not shown), and further electrically connected to the cap 31 of the connecting portion 30 via a pair of cords 14 .

The lens mounting portion 20 has an outer cover 21 forming a lower portion of the bell-shaped overall shape, and an annular locking portion 21a is formed inside the lower end portion of the outer cover 21 . The outer cover 21 is made of a synthetic resin and formed in a grid like the outer shell 11 of the drive circuit accommodating portion 10 . A flat cylindrical lens housing case 22 is arranged inside the outer cover 21 . The lens housing case 22 is held by the outer cover 21 by engaging the lower portion thereof with an annular engaging portion 21a. The locking portion 21 a is entirely located inside the lens mounting portion 20 and does not protrude downward (outward) from the exit surface 29 . A lattice-like portion 21b is formed in an upper portion of the engaging portion 21a. The lattice-like portion 21b is connected to the lattice-like portion 11b of the outer shell 11 located above it, so that air can flow between them. This is for enhancing the heat radiation effect.

The lens housing case 22 is made of metal, has a substantially cylindrical shape, and is open on both the upper and lower surfaces. The opening of the upper surface of the lens housing case 22 is closed by a disk-shaped LED mounting board 25 . The opening of the lower surface of the lens housing case 22 is closed by the circular connecting portion 23b of the optical lens 23. As shown in FIG. The connecting portion 23 b is substantially flat and forms an emission surface 29 of the LED lighting device 1 .

The entire lens housing case 22 is held inside the outer cover 21 by being locked by the locking portion 21 a of the outer cover 21 so as to be coaxial with the central axis thereof. The lens housing case 22 is also coaxial with the exit surface 29 .

A gap 28 is formed between the LED mounting substrate 25 and the lid 15, the outer wall 11a, and the lattice-like portion 11b located thereabove. The pair of cords 26 described above are arranged inside the gap 28 . The upper surface portion of the cavity 28 is adjacent to the lid 15 and the outer wall 11a and grid portion 11b of the outer shell 11 . The lower surface portion of the air gap 28 is adjacent to the back surface of the LED mounting substrate 25, that is, the surface opposite to the mounting surface on which the LED light source 24 is mounted. A side portion of the gap 28 is adjacent to the locking portion 21 a of the outer cover 21 .

Therefore, the heat generated from the plurality of LED light sources 24 on the LED mounting board 25 is immediately transferred to the air existing in the gap 28 via the LED mounting board 25 . Since the air can easily flow between the outside through the lattice portion 11b of the outer shell 11 and the lattice portion 21b of the outer cover 21, the heat generated from the plurality of LED light sources 24 is can be efficiently dissipated to the outside of the Also, the heat generated from the LED driving circuit (not shown) on the circuit board 13 is immediately transferred to the air present in the air gap 28 via the circuit board 13 . Since the air can easily flow between the outside and the outside through the lattice portion 11b of the outer shell 11 and the lattice portion 21b of the outer cover 21, the heat generated from the LED drive circuit is also transferred from the plurality of LED light sources 24. Like the generated heat, it can be efficiently dissipated to the outside of the LED lighting device 1 .

A disk-shaped light blocking plate 22 a is fixed inside the lens housing case 22 at a position between the LED mounting substrate 25 and the optical lens 23 . The light shielding plate 22 a is perpendicular to the side wall of the lens housing case 22 and parallel to the LED mounting board 25 and the emission surface 29 . A small gap 28a is formed between the light shielding plate 22a and the LED mounting board 25, and the LED light source 24 (projecting downward in FIG. 3) projecting from the LED mounting board 25 is arranged inside the gap 28a. there is Twelve through holes 22b are formed in the light shielding plate 22a so as to correspond one-to-one with the twelve LED light sources 24 arranged close to the light shielding plate 22a. The output light emitted from each of the 12 LED light sources 24 passes through the corresponding through hole 22b and passes through the incident side end face ( upper end surface).

The optical lens 23 arranged inside the lens housing case 22 is made of a transparent material such as epoxy resin or silicone resin. The optical lens 23 has a shape in which 12 lens elements 23a having substantially the same shape are connected by the above-described single circular connecting portion 23b.

The connecting portion 23b is transparent and has a substantially disc shape. Each of the 12 lens elements 23a is transparent and has a substantially truncated cone shape with an outer diameter gradually increasing from its upper end (incident side end) toward its lower end (exit side end). The central axis of each lens element 23a is parallel to the central axis of the connecting portion 23b (which is coaxial with the central axis of the lens housing case 22).

The 12 lens elements 23a are arranged in a layout as shown in FIG. 2 on the upper surface (plane on the incident side) of the connecting portion 23b. That is, three lens elements 23a are equally spaced on the inner circumference C2 along the circumference C2, and the remaining nine lens elements 23a are arranged on the outer circumference C1 (which is the inner circumference). concentric with the circumference C2) and equally spaced along the circumference C1 thereof. Both the inner circumference C2 and the outer circumference C1 are formed concentrically with the central axis of the connecting portion 23b.

The layout of the 12 lens elements 23a is the same as the layout of the 12 LED light sources 24 on the LED mounting board 25 and the layout of the 12 through holes 22b of the light shielding plate 22a. overlaps the corresponding one of the twelve LED light sources 24 through the corresponding through hole 22b. In other words, the twelve lens elements 23a and the twelve LED light sources 24 are in one-to-one correspondence. The upper end surfaces (end surfaces on the incident side) of the 12 lens elements 23a are separated from the corresponding end surfaces of the 12 LED light sources 24 (located at the lower end of the LED light sources 24 in FIG. 3) with a slight gap. are facing each other. In this way, the 12 output lights emitted from the 12 LED light sources 24 are reliably introduced into the corresponding ones of the 12 lens elements 23a through the corresponding through holes 22b. The output lights of the 12 LED light sources 24 respectively introduced into the 12 lens elements 23a propagate toward the exit surface 29 inside the lens elements 23a.

The twelve lens elements 23a have the same shape. Inside each lens element 23a, as shown in FIG. 3, a cylindrical entrance-side recess 23d, a cylindrical partition wall 23c, and a cylindrical exit-side recess 23e are arranged along the central axis. formed in order. This shape of each lens element 23a can also be said to be a shape in which a cylindrical partition wall 23c is formed at the central position of a cylindrical through-hole (through hole) including an incident side concave portion 23d and an outgoing side concave portion 23e. . The incident-side opening of the incident-side concave portion 23 d faces and is close to the corresponding end face of the LED light source 24 . The output-side opening of the output-side concave portion 23e is exposed at a corresponding portion of the output-side end face of the connecting portion 23b. Since the output-side end surface of the connecting portion 23b is on the output surface 29, the output-side opening of the output-side concave portion 23e is exposed on the output surface 29 to the outside. Therefore, on the exit surface 29, the exit-side openings of the twelve exit-side concave portions 23e are arranged in the layout shown in FIG.

Since the optical lens 23 has the structure described above, each of the output lights from the 12 LED light sources 24 first enters the incident side concave portion 23c of the corresponding lens element 23a, and passes through the outgoing surface 29. , and then collide with the partition wall 23d. As a result, part of the output light diffuses along the peripheral wall portion of the corresponding lens element 23a (the outer peripheral portion of the exit-side concave portion 23e), further diffuses inside the connecting portion 23b, and passes through the exit surface 29 to the outside. emitted to The rest of the output light passes through the partition wall 23d of the corresponding lens element 23a, propagates through the output-side concave portion 23e of the corresponding lens element 23a, and reaches the output surface without diffusing the connecting portion 23b. 29 to the outside. In this way, the output light passes through the entrance-side concave portion 23c, the peripheral wall portion, and the connecting portion 23b of the corresponding lens element 23a and reaches the exit surface 29, and the portion of the corresponding lens element 23a. The portion that passes through the incident side recess 23c, the partition wall 23d, and the exit side recess 23e and is emitted to the outside from the exit surface 29 is mixed and condensed with each other, and is emitted from the exit surface 29 to the housing. It is emitted to the outside.

As described above, the 12 output lights from the 12 LED light sources 24 pass through the incident-side concave portions 23c, the peripheral wall portions, and the connecting portions 23b of the 12 lens elements 23a, respectively, to the emission surface 29. The portion that reaches and the portion that passes through the incident side concave portions 23c, the partition walls 23c, and the outgoing side concave portions 23e of the 12 lens elements 23a and reaches the emission surface 29 are condensed while being mutually diffused and mixed. Therefore, the light is emitted from the emission surface 29 to the outside. In other words, the illumination light of the LED lighting device 1 emitted from the emission surface 29 is obtained by diffusing and mixing 12 output lights from the 12 LED light sources 24 by the optical lens 23 and condensing them. This illumination light is emitted from the emission surface 29 as a light beam having a circular cross section.

Here, the surface forming the output surface 29 of the connecting portion 23b is made translucent by processing it into a frosted glass state (providing small unevenness or scratches). In this way, the illumination light of the LED lighting device 1 generated by being diffused, mixed, and focused by the lens element 23a and the connecting portion 23b is slightly blurred compared to the case without the frosted glass processing, but 12 , the output light from the LED light sources 24 are sufficiently mixed to make the beam of illumination light more uniform, which is preferable. Needless to say, the surface forming the output surface 29 of the connecting portion 23b does not need to be subjected to frosted glass processing.

The LED mounting substrate 25 is formed of, for example, an aluminum disk, and as shown in FIG. ) is formed in the LED installation area 25a. The layout of the 12 LED installation areas 25a is the same as the layout of the 12 lens elements 23a shown in FIG. Each LED installation area 25a is a rectangular recess here, and the bottom surface of the corresponding LED light source 24 is fixed to the bottom surface of the recess using an appropriate adhesive. A total of 12 rectangular frames 25c are formed on the mounting surface so as to surround the corresponding LED installation areas 25a (and thus the corresponding LED light sources 24).

Inside the LED mounting board 25, a total of 12 LED light sources 24 mounted on its mounting surface are mounted on the surface of the circuit board 13 (which is inside the circuit board housing chamber 12). A wiring pattern 25b is formed for electrical connection to a circuit (not shown). A total of 12 connection portions (not shown) for electrically connecting the LED light sources 24 are formed in the wiring pattern 25b. These 12 connection portions are exposed inside corresponding installation areas 25a (recesses) on the mounting surface of the LED mounting substrate 25, and the bottom surfaces of the 12 LED light sources 24 are respectively located in the corresponding installation areas 25a. is electrically connected to the connection portion inside the

Each LED light source 24 is shaped like a bullet, and as shown in FIG. and a transparent sealing resin 24c formed to cover the phosphor 24b. The phosphor 24b is obtained by dispersing a predetermined phosphor material in a synthetic resin using an appropriate dispersant, and absorbs part of the visible light (blue-violet light) emitted from the LED chip 24a. , emits light of a specific color. Then, the light of a specific color emitted from the phosphor 24b is mixed with the blue-violet light emitted from the LED chip 24a to produce pseudo-white light. The specific color varies depending on the type of phosphor material, but is not limited thereto. The phosphor material is arbitrarily selected as long as it emits visible light (blue-violet light) having a peak wavelength of 405 nm and is mixed with light of a specific color emitted from the phosphor 24b to generate pseudo-white light. can do. The sealing resin 24c has a substantially hemispherical shape and is arranged so as to cover the phosphor 24b. The pseudo-white light is emitted forward (upward in FIG. 5) through the interior of the sealing resin 24c. In this way, the pseudo-white light emitted from each LED light source 24 is diffused, mixed, and converged by the optical lens 23 , and then emitted from the emission surface 29 as the illumination light of the illumination device 1 .

As described above, the quasi-white light output from the total of twelve LED light sources 24 is a mixture of blue-violet light emitted from the LED chip 24a and light of a specific color emitted from the phosphor 24b. Therefore, the pseudo-white light can function as a lighting fixture, and at the same time, the blue-violet light can function to inactivate microorganisms such as bacteria and viruses.

A specific example of the emission spectrum of the LED light source 24 described above is shown in FIG. As is clear from the emission spectrum of FIG. 13, the LED light source 24 used in the LED lighting device 1 contains visible light having a peak wavelength of 405 nm as a component, and has the effect of inactivating microorganisms such as bacteria. It can emit blue-violet light. In addition, this LED light source 24 does not have a peak wavelength in the visible light region other than the peak wavelength of 405 nm of blue-violet light (visible light) that has the effect of inactivating microorganisms such as bacteria. Therefore, the output light of the LED light source 24 is pseudo-white light containing visible light (blue-violet light) having a peak wavelength of 405 nm as a component. 2 (which has one or more peak wavelengths other than the peak wavelength of 405 nm in the visible light region) in the illumination device of No. 2.

Blue-violet light with a wavelength of 405 nm in the visible light region corresponds to so-called blue light, and depending on the amount of light (emission intensity) and irradiation time, it may adversely affect the human body (especially the eyes) and cause discomfort. It is also known to cause However, the output light generated by the LED light source 24 used in the LED lighting device 1 according to the present embodiment is pseudo-white light containing blue-violet light with a wavelength of 405 nm as a component. Since it is configured to be used as auxiliary light for light or pseudo-white light, in other words, the light intensity (light emission intensity) of the output light of the LED light source 24 is set sufficiently low, so that the human body (especially the eyes) ) or cause discomfort.

Specific examples of the specifications of the LED lighting device 1 described above include an outer diameter of 120 mm, a total length of 140 mm, a mass of 280 g, a drive current of 110 mA, a power consumption of 8 W, a beam angle of 50°, a maximum luminous intensity of 1860 cd, and a total The luminous flux is 1100 lm, the general color rendering index (Ra) is 92, and the color temperature is 3500K, 4000K or 5000K. When the color temperature is 3500K, the pseudo-white light as the illumination light of the LED lighting device 1 becomes warm white, when it is 4000K it becomes white light, and when it is 5000K it becomes neutral white. is used, and whether warm white light, white light, or natural white light is appropriate as auxiliary light for the main illumination light.

In addition, in order to prevent the blue-violet light with a wavelength of 405 nm from exerting a harmful effect on human skin and eyes, or on general human health, for example, the maximum luminous intensity of the pseudo-white light as the illumination light of the LED lighting device 1 is preferably set to 2800 cd or less, or 2000 cd or less. Further, the total luminous flux of the pseudo-white light is preferably set to 3500lm or less, 1500lm or less, or 1300lm or less. These values of the maximum luminous intensity value and the total luminous flux of the pseudo-white light are determined by the form of the LED lighting device 1, for example, a beam spherical type or a bulb type provided with an optical lens 23 as in the present embodiment (Fig. 1 to 3) or a fluorescent lamp type (for example, a straight tube type, a circular tube type, or a light bulb type) without an optical lens 23. It may be arbitrarily adjusted according to the shape and total area of the exit surface 29 .

As the LED light source 24 incorporated in the LED lighting device 1 according to this embodiment, for example, a white LED (model number: NF2W585ART-P8) manufactured by Nichia Corporation can be preferably used. In fact, this white LED is a bullet-shaped LED that emits quasi-white light containing blue-violet light (visible light) with a wavelength of 405 nm as a component. lumen). Since the absolute maximum rated forward current of power LEDs is 300-400mA or more, the LEDs manufactured by Nichia Corporation are obviously not power LEDs, so the amount of light output is similar to that of power LEDs. This LED is suitable for realizing the above-described specifications of the LED lighting device 1 according to this embodiment.

(Usage form of LED lighting device)
Next, a usage pattern of the LED lighting device 1 according to this embodiment having the above-described configuration will be described.

First, the spiral groove on the outer periphery of the base 31 of the connection part 30 of the LED lighting device 1 is screwed into the spiral groove on the inner periphery of the socket (not shown) of the lighting fixture, and the LED lighting device 1 is attached to the lighting fixture. . Then, the power switch of the lighting fixture is turned on. Thereby, the LED lighting device 1 is electrically connected to the power source (for example, AC 100V). At this time, since the power supply voltage is supplied to the circuit board 13 inside the circuit board housing chamber 12 via the pair of cords 14, the LED driving circuit (not shown) mounted on the circuit board 13 is start working. The LED drive current generated by the started LED drive circuit is supplied to a total of 12 LED light sources 24 mounted on an LED mounting substrate 25 via a pair of cords 26, and accordingly a total of 12 LED light sources are supplied. 24 are driven. As a result, each of these LED light sources 24 simultaneously outputs pseudo-white light as output light.

A total of 12 pseudo-white light beams (output light beams) output in this manner pass through the entrance-side concave portions 23d, the peripheral wall portions, and the connecting portions 23b of the 12 lens elements 23a, and reach the output surface 29. , the portions of the 12 lens elements 23a passing through the entrance-side recesses 23d, partition walls 23c, and exit-side recesses 23e and reaching the exit surface 29 are diffused and mixed with each other, and then exit from the exit surface 29. emitted. That is, the illumination light of the LED lighting device 1 emitted from the emission surface 29 is obtained by diffusing and mixing 12 output lights from the 12 LED light sources 24 by the optical lens 23 and concentrating them on the emission surface 29. becomes. This illumination light is emitted from the emission surface 29 as a light beam having a substantially circular cross section.

When the LED lighting device 1 according to the present embodiment is used to illuminate a desired target space, a main lighting device that emits main illumination light for illuminating the target space is used at the same time, and the main lighting device is used at the same time. In the presence of the main illumination light emitted by the device, the quasi-white light emitted by the LED illumination device 1 is used as auxiliary illumination light. This is because the luminous intensity is insufficient to illuminate the target space with the LED lighting device 1 alone, and the pseudo-white light, which is the illumination light of the LED lighting device 1, is used as the main illumination light. When the intensity (luminous flux) of is increased, the intensity (luminous flux) of the blue-violet light with a sterilizing effect included in the pseudo-white light also increases, adversely affecting the body (especially the eyes) of the person in the target space. This is because there is a fear that

(Effect confirmation test)
The LED lighting device 1 according to one embodiment of the present invention having the configuration described above was actually manufactured, and bacteria were killed by the microorganism inactivation action of blue-violet light with a peak wavelength of 405 nm contained in the pseudo-white light as the illumination light. In order to confirm the activation effect, a test (effect confirmation test) was conducted. Among the manufactured LED lighting devices 1, one had a large amount of pseudo-white light (type 1) and one had a small amount (type 2) of pseudo-white light as illumination light. For type 1, in which the amount of pseudo-white light is large, the driving current was set so that the illuminance of the irradiated surface was 8000 lux (lx). For type 2, in which the amount of pseudo-white light is small, the drive current was set so that the illuminance of the irradiated surface was 1800 lx (approximately 20% of the illuminance of type 1).

The test procedure was as follows.

(1) Staphylococcus aureus and Pseudomonas aeruginosa were used as test bacteria. (2) The test operation was as follows. First, each of the two types of test bacteria was cultured with shaking at 35°C for 24 hours using trypticase soy broth medium, and then diluted with fresh trypticase soy broth medium. A fungal solution was prepared. Each 0.1 mL of the prepared bacterial solution was smeared on the surface of a standard agar plate prepared in advance using a petri dish. Subsequently, after opening the lid of the petri dish and irradiating the LED lighting device 1 according to the present embodiment for 7 hours or 24 hours at intervals of 65 cm on the medium, the plate medium with the lid closed (one plate each), and The LED lighting device 1 according to the present embodiment is used to leave non-irradiated plate culture media (2 plates) at 35 ° C. for 48 hours, and the colonies formed on the culture medium surface are counted and photographed (each 1 test section).

The test results are shown in FIGS. 7-9. As can be seen from FIG. 7, for both the case where the amount of pseudo-white light is large (type 1) and the case where the amount of pseudo-white light is small (type 2), the number of colonies of both Staphylococcus aureus and Pseudomonas aeruginosa is It decreases with irradiation time. However, the degree of decrease (speed) differs greatly, and the amount of pseudo-white light with a large amount (Type 1) decreases faster than the amount of pseudo-white light with a small amount (Type 2). ing. The illumination light emitted from the LED lighting device 1 according to the present embodiment includes visible light having a peak wavelength at 405 nm as a component, and a pseudo light that does not have a peak wavelength other than the peak wavelength of the visible light in the visible light region. Since it is white light and its emission intensity is low (for example, the maximum luminous intensity is 1860 cd and the total luminous flux is 1100 lm), the microbial inactivation effect is weak. It was found that the bacteria were only killed by irradiation, and in the case of type 2 Staphylococcus aureus, a considerable number of colonies remained even after irradiation for 24 hours. Colony images for type 1 are shown in FIGS. 8(a) and 8(b), and colony images for type 2 are shown in FIGS. 9(a) and 9(b), respectively.

As a comparative example, a similar test was conducted using a conventionally known LED lighting device that emits ultraviolet light. However, Escherichia coli was used as the test bacteria in addition to the above Staphylococcus aureus and Pseudomonas aeruginosa.

The test procedure for the comparative example was as follows.

(1) Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa were used as test bacteria. (2) The test operation was as follows. First, each of the three test bacteria was cultured in trypticase soy broth medium with shaking at 35°C for 24 hours, diluted with fresh trypticase soy broth medium, and the bacterial solution of each test bacteria was diluted. prepared. Each 0.1 mL of the prepared bacterial solution was smeared on the surface of a standard agar plate prepared in advance using a petri dish. Subsequently, after opening the lid of the petri dish and irradiating the ultraviolet light LED lighting device of the comparative example for 1 minute or 3 minutes at an interval of 5 cm on the medium, the plate medium with the lid closed (1 each), and the comparison The ultraviolet light LED lighting device of the example was left unirradiated on two flat plates at 35 ° C for 48 hours, and the colonies formed on the surface of the medium were counted and photographed (each test plot 1 sheet).

The test results are shown in FIGS. 10 to 12. FIG. As can be seen from FIG. 10, the number of colonies of each of Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa becomes zero after irradiation for one minute. The colony images are shown in FIGS. 11(a) and (b) and FIG. Since the illumination light emitted from the LED lighting device of the comparative example is ultraviolet light, it was confirmed that all of Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa are killed by irradiation for a very short time (less than 1 minute). Ta. As a result, it is confirmed that a much stronger bactericidal action can be obtained by using the conventional LED lighting device (ultraviolet light irradiation) than by using the LED lighting device 1 according to the present embodiment. Ta. In addition, as a result, the illumination light of the LED lighting device 1 according to the present embodiment is used as "auxiliary illumination light" of the main illumination light in the presence of the main illumination light for illuminating the desired target space. It has also been found to be suitable for

(Additional effect confirmation test)
Furthermore, as an additional effect confirmation test, the LED lighting device 1 according to the present embodiment having the configuration described above was actually manufactured, and microorganisms were killed by blue-violet light with a peak wavelength of 405 nm contained in the pseudo-white light as illumination light. An additional test (additional effect confirmation test) was conducted in order to confirm the effect of inactivating bacteria by the activation action. The manufactured LED lighting device 1 has a pseudo white light as illumination light so that the illuminance of the irradiated surface is 5000 lx (lux) (equivalent to an irradiation distance of 50 cm), 2000 lx (equivalent to an irradiation distance of 100 cm), and 1000 lx (equivalent to an irradiation distance of 150 cm). Light intensity adjusted.

The media, reagents and equipment used were as follows.

1) Medium (a) Dulbecco's Modified Eagle's Medium (Sigma-Aldrich, hereinafter DMEM)
(b) Dulbecco's Modified Eagle Medium "Nissui" (2) (Nissui Pharmaceutical, hereinafter DME)
(c) SCDLP bouillon medium (Eiken Chemical, hereinafter SCDLP)
2) Reagents (a) Fetal Bovine Serum (Sigma-Aldrich, hereinafter, FBS)
(b) Dulbecco's PBS (-) "Nissui" (Nissui Pharmaceutical, hereinafter PBS)
3) Equipment (a) Micropipette 200 μl, 1000 μl (Gilson)
(b) Electric 8-channel multichannel pipette (10-300 μl, Sartorius)
(c) Electric 8-channel multichannel pipette (50-1200 μl, Sartorius)
(d) Safety cabinet (BHC-1902 IIB, Airtech)
(e) _CO2 incubator (MCO-230AICUVH-PJ PHCbi)
The virus for testing was prepared as follows. That is, feline feline enteric coronavirus, WSU 79-1683) is inoculated into a feline fetal cell line (Fcwf-4: Felis catus whole hetus) cultured in a monolayer in a cell culture flask, and the cell is infected with the virus. were placed in a CO ₂ incubator at 37° C. for infection. After 1 hour, 0.2% FBS-added DMEM was added and cultured in a 37° C. CO ₂ incubator for about 20 hours. After culturing, the flask was cryopreserved in a −30° C. freezer. After that, a thawing operation was performed, and the virus solution concentrated by the polyethylene glycol precipitation method was used as a stock virus solution and stored at -80°C. For the test, the stock virus solution was diluted 3-fold with PBS to prepare a test virus solution.

The test method was as follows.

1) Preparation of Virus Attachment Test Carrier First, an unprocessed glass plate (5 cm×5 cm) to be used was washed with a neutral detergent, rinsed well with tap water, replaced with deionized water, and dried. It was then irradiated with a germicidal lamp for about 30 minutes in a safety cabinet. After that, the raw glass plate was placed in a moistened petri dish, 0.4 mL of the test virus solution was inoculated onto the raw glass plate, and the 40 mm × 40 mm polypropylene (PP) film was covered from above. and used as a virus adhesion test carrier. The petri dish was covered with borosilicate glass to keep moisture. FIG. 14 shows the state of the virus-attached test carrier.

2) Virus inactivation test An outline of the test system is shown in FIG. The LED lighting device 1 according to one embodiment of the present invention is installed at a predetermined position on the upper end side of the support installed on the floor, and a predetermined irradiation distance is provided directly below the LED lighting device 1 on the floor. The virus adhesion test carrier was installed, and the illumination light of the LED lighting device 1 was irradiated for a predetermined time. For "no irradiation (control)", the virus adhesion test carrier placed in the humidified petri dish was placed in a light-shielded container and allowed to stand in a constant temperature bath set at 25°C for a predetermined period of time. After irradiation or after standing still, the virus adhesion test carrier is taken out and transferred to a styrene case, 10 mL of washing solution (SCDLP diluted 5-fold with PBS) is added, and shaken for 3 minutes at a frequency of about 100 times per minute. to wash out the virus (see FIG. 16). This washing solution was used as the stock solution of the sample for measuring the infectivity titer.

3) Measurement of virus infectivity titer by TCID ₅₀ (50% cultured cell infectivity titer) method Cells for measuring virus infectivity titer were seeded in advance in a 96-well plate and cultured for 4 days in the CO ₂ incubator. On the day of the test, the culture supernatant was removed and replaced with 1% FBS-added DME. The stock solution of the sample for titer measurement was serially diluted 10-fold with PBS, and 25 μL of the stock solution of the sample for titer measurement or a sample serially diluted 10-fold with PBS was inoculated into the wells from which the culture medium was removed. In order to infect the cells with the virus, they were placed in a _CO2 incubator. After 1 hour, the inoculated samples for titer measurement were removed, 0.1 mL of DME containing 1% FBS was added to each well, and cultured in a CO ₂ incubator for 4 days. After culturing, CPE produced by virus proliferation was observed under a microscope, and the virus infectivity titer (TCID ₅₀ /mL) was determined by the Reed-Muench method. The virus infectivity titer was expressed as the infectivity titer per test carrier from the washing volume (10 mL).

4) Calculation of logarithmic reduction of infectious titer From the infectious titer without irradiation (control) at each time and the infectious titer after irradiation with the illumination light at each time, the logarithmic reduction of infectious titer (= LRV, log reduction value) and reduction rate (%) were calculated.

LRV = log ₁₀ (infectious titer without irradiation for each hour/infectious titer after irradiation for each hour)
Decrease rate (%) = (1-1/10 ^LRV ) x 100
The test results are shown in FIGS. 17 and 18. FIG.

As shown in FIG. 17, the initial infectivity titer during the 6-hour and 24-hour tests without illumination light irradiation (control) of the LED lighting device 1 according to the present embodiment, and during the 16-hour test were 2.4, respectively. ×10 ⁶ TCID ₅₀ /test carrier and 4.0 × 10 ⁶ TCID ₅₀ /test carrier. Infectious titers after 6, 16 and 24 hours without irradiation (control) were 1.7×10 ⁶ TCID ₅₀ /test carrier, 2.2×10 6 TCID 50 /test carrier and 2.2×10 ⁶ TCID ₅₀ /test carrier, respectively. 3×10 ⁶ TCID ₅₀ /test carrier.

On the other hand, the infection titer after 6 hours, 16 hours, and 24 hours of irradiation with the illumination light of the LED lighting device 1 according to the present embodiment is 2.7×10 at “5,000 lx (equivalent to an irradiation distance of 50 cm)”. ⁴ TCID ₅₀ /test carrier, below the limit of detection (<1.3×10 ² TCID ₅₀ /test carrier) and below the limit of detection (<1.3×10 ² TCID ₅₀ /test carrier). In addition, in "2,000lx (equivalent to irradiation distance of 100 cm)", 5.9 × 10 ⁵ TCID ₅₀ / test carrier, 1.9 × 10 ² TCID ₅₀ / test carrier, and less than the detection limit value (<1.3 ×10 ² TCID ₅₀ /test carrier). In addition, at "1,000 lx (corresponding to irradiation distance of 150 cm)", 5.0 × 10 ⁵ TCID ₅₀ / test carrier, 2.4 × 10 ² TCID ₅₀ / test carrier, and 1.6 × 10 ² TCID ₅₀ / was the test carrier.

From the test results shown in FIG. 17, it can be said that the feline coronavirus is inactivated by irradiating with the illumination light (pseudo-white light) of the LED lighting device 1 according to this embodiment. For example, with 6-hour irradiation at 5,000 lx (equivalent to an irradiation distance of 50 cm), the virus infectivity (the number of virus particles with cell infectivity) decreased by about two orders of magnitude, and with 16-hour irradiation and 24-hour irradiation, the virus infectivity is below the detection limit, it can be seen that the infectivity becomes zero and the feline coronavirus is completely inactivated after approximately 16 hours of irradiation at 5,000 lx.

In addition, with 6-hour irradiation at 2,000 lx (equivalent to irradiation distance of 100 cm), the virus infectivity decreased by about 1 digit, with 16-hour irradiation it decreased by about 4 digits, and with 24-hour irradiation, the virus infectivity was below the detection limit. Therefore, it can be seen that at 2,000 lx, if it is irradiated for about 24 hours, the infectivity becomes zero and the feline coronavirus is completely inactivated.

Furthermore, with 1,000 lx (equivalent to irradiation distance of 150 cm) for 6 hours irradiation, the virus infectivity decreased to about (1/3), and with 16 hours irradiation it decreased by about 4 orders of magnitude, and with 24 hours irradiation it was lower than 16 hours irradiation. Since it has decreased and is approaching the detection limit value, the infectivity becomes zero at 1,000 lx, and in order to completely inactivate the feline coronavirus, the infectivity becomes almost zero after irradiation for about 24 hours. , it can be seen that the feline coronavirus is almost completely inactivated.

As shown in FIG. 18, the infection titer logarithmic reduction value (decrease rate) after irradiation for 6 hours, 16 hours, and 24 hours of the illumination light of the LED lighting device 1 according to this embodiment is "5,000 lx (irradiation Equivalent to a distance of 50 cm)” is 1.7 (98.0%), >4.2 (99.99%), and >4.2 (99.99%), and “2,000 lx (irradiation distance 100 cm equivalent)” is 0.4 (60%), 4.0 (99.99%), and > 4.2 (99.99%), and “1,000 lx (irradiation distance equivalent to 150 cm)” were 0.5 (68.0%), 3.9 (99.98%), and 4.1 (99.99%).

From the test results shown in FIG. 18, the degree of decrease in the virus infectivity titer due to illumination light irradiation of the LED lighting device 1 according to this embodiment can be understood. That is, at 5,000 lx (equivalent to an irradiation distance of 50 cm), the virus infectivity titer is 99.99% or more after 16 hours irradiation and 24 hours irradiation. Activate. At 2,000 lx (corresponding to an irradiation distance of 50 cm), the virus infectivity titer is 99.99% or more after 24 hours of irradiation, so irradiation for about 24 hours or more completely inactivates the feline coronavirus. At 1,000 lx (equivalent to an irradiation distance of 150 cm), the virus infectivity titer is 99.99% or more after 24 hours of irradiation. I understand.

(Effect of lighting device)
As described in detail above, in the LED lighting device 1 according to one embodiment of the present invention, the output light output from the twelve LED light sources 24 arranged inside the housing has a microorganism inactivation effect. It is a pseudo-white light that contains visible light (blue-violet light) with a peak wavelength of 405 nm as a component and does not have a peak wavelength other than the peak wavelength of 405 nm of the visible light in the visible light region, and is emitted The illumination light emitted from the surface 29 to the outside of the housing is pseudo-white light generated by condensing the output light by the optical lens 23 . The illumination light is used as auxiliary illumination light for the main illumination light in the presence of the main illumination light for illuminating the desired target space. For example, the maximum luminous intensity of the pseudo-white light as the illumination light is set to 2000 cd or less, and the total luminous flux is set to 1300 lm or less. Therefore, it is not necessary to increase the intensity of the output light emitted from the LED light source 24 . This means that the LED light source 24 does not have to be constructed using so-called power LEDs. In addition, the power LED is an LED that is driven by a larger current than a general LED (for example, a current that is 10 times or more that of a general LED) and has a higher luminance than a general LED, and has a heat dissipation structure. . The driving current of a general LED is about several mA to several tens of mA, but the power LED has several hundred mA or more, and correspondingly has high brightness.

The LEDs used in the lighting fixture of Patent Literature 1 mentioned above are clearly power LEDs, since their drive current is several hundred mA (see paragraph 0042). Moreover, it has a dedicated structure and function as described above. Therefore, the manufacturing cost is inevitably high. Although there is no description of the drive current for the LED used as the light-emitting device in the lighting device of Patent Document 2, the lighting device obtained an illuminance of 100,000 lux (lx), which is equivalent to the light intensity of an operating lamp. (see paragraphs 0060 and 0073), it is presumed to be a power LED. Moreover, it has a dedicated structure and function as described above. Therefore, this also inevitably increases the manufacturing cost. On the other hand, the LED light source 24 used in the LED lighting device 1 of the present embodiment is a general LED if the output light contains visible light with a peak wavelength of 405 nm having a microorganism inactivation effect as a component. can be realized using , the manufacturing cost is low. Therefore, the LED lighting device 1 of the present embodiment can be manufactured at a lower cost than the lighting fixture of Patent Document 1 and the lighting device of Patent Document 2 described above.

In addition, the output light of the LED light source 24, which is composed of general LEDs instead of power LEDs, contains the visible light having a microbial inactivation effect as a component, and has a peak wavelength other than the peak wavelength of the visible light. Although it is a pseudo-white light that does not have a visible light range, the intensity of the visible light with a peak wavelength of 405 nm that has a microbial inactivation effect is the same visible light used in the lighting fixture of Patent Document 1 described above. , which is much lower than similar visible light intensities used in the illumination device of US Pat. Moreover, the pseudo-white light as the illumination light generated by condensing the pseudo-white light as the output light by the optical lens 23 can be generated in the presence of the main illumination light for illuminating the desired target space. , to be used as auxiliary illumination light for the main illumination light.

Therefore, when choosing an installation site, little care needs to be taken to ensure that said visible light does not cause harmful effects on human skin and eyes, or on human health in general. Moreover, when selecting an installation location, on the premise that the main lighting device is installed, the pseudo-white light containing the visible light with a peak wavelength of 405 nm that has a microbial inactivation effect as a component is used by the main lighting device. It can be suitably (effectively) used as auxiliary light for the emitted main illumination light. Furthermore, after installation at a desired installation location, the visible light having a microbial inactivation action contained as a component in the pseudo-white light as illumination light is harmful to human skin and eyes, or to human health in general. There is no fear of giving a bad effect.

(Modification)
The above-described embodiments are examples of embodying the present invention. Therefore, it goes without saying that the present invention is not limited to the embodiments described above, and that various modifications are possible without departing from the scope of the present invention.

For example, in the LED lighting device 1 of the above-described embodiment, visible light (blue-violet light) having a peak wavelength of 405 nm is used as the output light of the LED light source 24, but the present invention is limited to this. isn't it. Visible light having a peak wavelength different from 405 nm can also be used as long as it has the effect of inactivating microorganisms such as bacteria and viruses. For example, visible light having a peak wavelength in the range of 400 nm or more and 410 nm or less has the effect of inactivating microorganisms such as bacteria and viruses, so any visible light having a peak wavelength in this range can be used. good too.

Also, in the LED lighting device 1 of the above-described embodiment, the optical lens 23 having a configuration in which the 12 lens elements 23a are connected by a single connecting portion 23b is used, but the present invention is limited to this. isn't it. If the output light of a plurality of LED light sources 24 can be mixed and condensed and emitted as emitted light, a shape and configuration different from the optical lens 23 used in the LED lighting device 1 of the above-described embodiment can be used. Any optical lens that has can be used.

Furthermore, the LED lighting device 1 of the above-described embodiment is configured as a spherical beam type in which the connecting portion 30 is fixed at one end and the emission surface 29 for the illumination light is formed at the other end. Although the quasi-white light is emitted from the emission surface 29 in the form of a beam, the present invention is not limited to this. One or a plurality of LED light sources 24, the LED drive circuit, and an optical lens 23 are provided inside a housing having a connection portion 30 and an emission surface 29, and the output light is used to detect microorganisms such as bacteria and viruses. is a pseudo-white light that contains, as a component, visible light that has the effect of inactivating the visible light, and does not have a peak wavelength other than the peak wavelength of the visible light in the visible light region; The illumination light emitted to the outside is pseudo-white light generated by condensing the output light by the optical lens 23, and the illumination light is the main illumination light for illuminating the desired target space. The shape and configuration are arbitrary as long as they are configured to be used as auxiliary illumination light for the main illumination light. For example, the LED light source part of the lighting device may be a replaceable unit, and the LED light source part may be detachable from the lighting device. The LED light source unit may be integrally fixed so that only the LED light source unit cannot be replaced, and the lighting device including the LED light source unit may be replaced when necessary. Furthermore, it is needless to say that a light bulb type may be used in which the connecting portion 30 is fixed at one end and the output surface 29 formed in a convex spherical shape is formed at the other end.

Furthermore, in the LED lighting device 1 of the above-described embodiment, an LED (which outputs pseudo-white light) having the structure shown in FIG. 5 is used as a light source, but the present invention is not limited to this. . Any LED that can output visible light having a peak wavelength in the range of 400 nm or more and 410 nm or less, preferably pseudo-white light containing visible light having a peak wavelength of approximately 405 nm as a component, is not limited in its configuration. configurations are available.

Furthermore, the optical lens 23 may be omitted in the LED lighting device 1 of the embodiment described above. In this case, the lens mounting portion 20 that constitutes the lower half of the housing is hollow, and a disk-shaped cover (usually made of glass or plastic) is arranged in a portion corresponding to the connecting portion 23b of the optical lens 23. , the outer surface of the glass cover forms the output surface 29 . The output lights of the plurality of LED light sources 24 are mixed in the cavity inside the lens mounting portion 20 and then radially emitted from the emission surface 29 as the illumination light. Therefore, the illumination light does not form a beam and cannot be used for spot illumination. It becomes a lighting device suitable for irradiating a wider range than the LED lighting device 1 of the embodiment described above. In this case, the maximum luminous intensity and the total luminous flux of the pseudo-white light as the illumination light are appropriately adjusted so that the blue-violet light with a wavelength of 405 nm does not exhibit harmful effects on human skin and eyes, or on human health in general. adjusted.

In addition, in the LED lighting device 1 of the embodiment described above, when the optical lens 23 is omitted, it becomes possible to flexibly change the overall shape of the housing. Therefore, by using a straight tube, circular tube, or light bulb-shaped glass or plastic cover for the housing, the overall shape of the LED lighting device 1 can be changed, for example, from the existing straight tube type, circular tube type, or light bulb type. It can have the same shape as the fluorescent lamp in the formula, or it can have a disk shape or the like. In this manner, the overall shape of the housing when the optical lens 23 is omitted can be arbitrarily set as required. Also in this case, the maximum luminous intensity and the total luminous flux of the pseudo-white light as the illumination light are set so that the blue-violet light with a wavelength of 405 nm does not exert a harmful effect on human skin and eyes, or on human health in general. adjusted accordingly.

The LED lighting device of the present invention emits pseudo-white light as illumination light and at the same time deactivates microorganisms such as bacteria and viruses existing in a desired target space by utilizing the microorganism inactivation effect of visible light. At the same time, it can be widely used in places where it is strongly desired that the visible light does not cause harmful effects on human skin and eyes, or on human health in general.

1 LED lighting device 10 drive circuit accommodating portion 11 outer shell 11a outer wall 11b of the outer shell lattice portion 12 circuit board accommodating chamber 13 circuit board 14 cord 15 lid 20 lens mounting portion 21 outer cover 21a locking portion 21b of outer cover outer cover Lattice-like portion 22 Lens storage case 22a Light shielding plate 22b Through hole 23 of light shielding plate Optical lens 23a Lens element 23b of optical lens Connecting portion 23c of optical lens Incidence side concave portion 23d of optical lens Partition wall 23e of optical lens Output side of optical lens Recess 24 LED light source 24a LED chip 24b Phosphor 24c Sealing resin 25 LED mounting substrate 25a LED installation area 25b Wiring pattern 25c Frame 26 Cord 28 Gap 29 Output surface 30 Connection part 31 Base C1 Outer circumference C2 Inner circumference

Claims (16)

a housing having an emission surface for illumination light;
one or more LED light sources disposed inside the housing;
an LED drive circuit that drives the one or more LED light sources;
an optical lens arranged inside the housing for condensing the output light output by the one or more LED light sources and emitting the illumination light from the emission surface to the outside of the housing;
The output light is quasi-white light that contains, as a component, visible light that has the effect of inactivating microorganisms such as bacteria and viruses, and that does not have a peak wavelength in the visible light region other than the peak wavelength of the visible light. ,
the illumination light emitted from the emission surface to the outside of the housing is pseudo-white light generated by condensing the output light with the optical lens;
The illumination light is configured to be used as auxiliary illumination light for the main illumination light in the presence of the main illumination light for illuminating a desired target space. . a housing having an emission surface for illumination light;
one or more LED light sources disposed inside the housing;
and an LED drive circuit that drives the one or more LED light sources,
The output light is quasi-white light that contains, as a component, visible light that has the effect of inactivating microorganisms such as bacteria and viruses, and that does not have a peak wavelength in the visible light region other than the peak wavelength of the visible light. ,
the illumination light emitted from the emission surface to the outside of the housing is pseudo-white light generated by mixing the output light within the housing;
The illumination light is configured to be used as auxiliary illumination light for the main illumination light in the presence of the main illumination light for illuminating a desired target space. . the optical lens has a shape in which a plurality of lens elements having substantially the same shape are connected to each other by a single connecting portion;
The plurality of output lights from the plurality of LED light sources respectively pass through both the plurality of lens elements and the connecting portion and reach the exit surface, and the portion where only the plurality of lens elements pass and the above 2. The LED lighting device according to claim 1, wherein the light emitted from the light emitting surface and the portion reaching the light emitting surface are mixed and condensed with each other, and then emitted from the light emitting surface to the outside of the housing. The housing is configured as a spherical beam type or bulb type in which a connecting portion is fixed at one end and the exit surface is formed at the other end,
4. The LED lighting device according to claim 1, wherein the pseudo-white light as the illumination light is emitted from the emission surface in the form of a beam or radially. 5. The LED lighting device according to claim 4, wherein the maximum luminous intensity of said pseudo-white light as said illumination light is set to 2000 cd or less. 5. The LED lighting device according to claim 4, wherein the total luminous flux of said pseudo-white light as said illumination light is set to 1300 lm or less. 5. The LED lighting device according to claim 4, wherein the visible light has a peak wavelength in the range of 400 nm or more and 410 nm or less. 5. The LED illumination device of claim 4, wherein the visible light is blue-violet light with a peak wavelength of approximately 405 nm. The housing is configured as a fluorescent lamp type,
3. The LED lighting device according to claim 2, wherein the pseudo-white light as the illumination light is radially emitted from the emission surface. 10. The LED lighting device according to claim 9, wherein the maximum luminous intensity of said pseudo-white light as said illumination light is set to 2800 cd or less. 10. The LED lighting device according to claim 9, wherein the maximum luminous intensity of said pseudo-white light as said illumination light is set to 2000 cd or less. 10. The LED lighting device according to claim 9, wherein the total luminous flux of said pseudo-white light as said illumination light is set to 3500 lm or less. 10. The LED lighting device according to claim 9, wherein the total luminous flux of said pseudo-white light as said illumination light is set to 1500 lm or less. 10. The LED lighting device according to claim 9, wherein the visible light has a peak wavelength in the range of 400 nm or more and 410 nm or less. 10. The LED illumination device of claim 9, wherein the visible light is blue-violet light with a peak wavelength of approximately 405 nm. When the illumination light is used as the auxiliary illumination light in the presence of the main illumination light for illuminating the target space, the illuminance of the irradiation surface specified in the target space is 5000 lx or less. 3. The LED lighting device according to claim 1 or 2, wherein the lighting distance of the illumination light to the irradiation surface is set so as to be

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