Ultraviolet Radiation Device

Abstract

To provide an ultraviolet ray radiation device which makes it possible to easily check that ultraviolet ray is being radiated.SOLUTION: An ultraviolet ray radiation device 11 comprises a reflector 18, an ultraviolet light-emitting element 31 and an inner fluorescent substance 19. The reflector 18 has an emission part 26 capable of emitting light generated inside to the outside. The ultraviolet light-emitting element 31 is provided inside reflector 18, and radiates light in an ultraviolet wavelength region. The inner fluorescent substance 19 is provided inside reflector 18, at least a part of which is opposed to the emission part 26, and is excited by light in the ultraviolet wavelength region to radiate light in a visible region.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] An embodiment of the present invention relates to an ultraviolet radiation device for emitting ultraviolet light. [Background technology]

[0002] Conventionally, ultraviolet lamps that emit ultraviolet light have been used for the purpose of sterilization, etc. Discharge lamps have been used as ultraviolet lamps, but there are studies being conducted on their replacement with ultraviolet light emitting elements such as LEDs that emit light in the ultraviolet wavelength range.

[0003] In the case of discharge-type ultraviolet lamps, visible light is emitted along with ultraviolet light, making it possible to confirm whether ultraviolet light is being emitted or not. In contrast, ultraviolet light-emitting devices only emit light in the ultraviolet wavelength range, and do not emit light in the visible range, making it difficult to confirm whether ultraviolet light is being emitted or not.

[0004] There is also an ultraviolet radiation device equipped with a phosphor that is excited by ultraviolet wavelength light from an ultraviolet light emitting element and emits visible light. With this ultraviolet radiation device, it is possible to confirm that ultraviolet light is being emitted by visually checking the emission of visible light, but there is a demand for improved visibility of the visible light to make this easier to check. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-167147 A Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide an ultraviolet ray emitting device that makes it easy to confirm that ultraviolet rays are being radiated. [Means for solving the problem]

[0007] The ultraviolet radiation device of the embodiment includes a reflector, an ultraviolet light emitting element, and an internal phosphor. The reflector has an emission part capable of emitting light generated inside to the outside. The ultraviolet light emitting element is provided inside the reflector and emits light in the ultraviolet wavelength range. The internal phosphor is provided inside the reflector, at least a portion of which faces the emission part, and is excited by light in the ultraviolet wavelength range to emit light in the visible range. Light in the ultraviolet wavelength range is predominantly emitted from the upper part of the emission section, and light in the visible range is predominantly emitted from the lower part of the emission section. Effect of the Invention

[0008] According to the ultraviolet ray irradiation device of the embodiment, it is expected that it will be easier to confirm that ultraviolet rays are being radiated. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of an ultraviolet ray radiation device showing a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the ultraviolet radiation device. [Diagram 3] FIG. 4 is a cross-sectional view of an ultraviolet radiation device showing a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The first embodiment will be described below with reference to FIGS.

[0011] An example of a germicidal lamp for sterilizing air is shown in Figure 1. The germicidal lamp 10 includes an ultraviolet ray emitting device 11 and an attachment device 12 for attaching the ultraviolet ray emitting device 11 in a suspended state from the ceiling. In this specification, the term "sterilization" can be replaced with "disinfection," "sterilization," "sterilization," etc.

[0012] 2 shows a cross-sectional view of a surface perpendicular to the longitudinal direction of the elongated main body 15 of the germicidal lamp 10. The ultraviolet emitting device 11 includes the main body 15, a light emitting module 16, a heat sink 17, a reflector 18, and an internal phosphor 19 disposed within the main body 15, and a power supply device disposed in the main body 15 or in a location separate from the main body 15.

[0013] The main body 15 is a housing forming the outer shell of the ultraviolet emitting device 11, and is formed long in the width direction, which is the horizontal direction. The main body 15 is formed, for example, from a metal plate, and is provided in a rectangular tubular shape having an approximately U-shaped cross section with an upper surface portion 22, a lower surface portion 23, and a rear surface portion 24, and end surface portions 25 that close both ends in the longitudinal direction. An opening (main body opening) 27 that constitutes an emission portion 26 through which light is emitted to the outside is provided on the front side of the main body 15.

[0014] The light emitting module 16 also includes a substrate 30 and a plurality of ultraviolet light emitting elements 31 mounted on the surface of the substrate 30 .

[0015] The substrate 30 is formed in a long, flat plate shape. The substrate 30 has a substrate base mainly made of a metal material such as copper (Cu) or aluminum (Al) that has good heat dissipation properties, or a substrate base mainly made of an inorganic material such as aluminum nitride (AlN), aluminum oxide (Al2O3), or silicon nitride (Si3N4) that is not easily deteriorated by ultraviolet light. An insulating layer is formed on the surface of the substrate base, and a metal wiring pattern 32 that constitutes a connection circuit is formed on the insulating layer. A plurality of ultraviolet light emitting elements 31 are mounted on the wiring pattern 32 of the substrate 30.

[0016] The ultraviolet light emitting elements 31 are mounted on the wiring pattern 32 of the substrate 30 so as to be arranged along the longitudinal direction of the substrate 30. The ultraviolet light emitting elements 31 are connected in series or in series-parallel by a connection circuit. The ultraviolet light emitting elements 31 emit light (UV-C) in the ultraviolet wavelength range with a peak wavelength of 300 nm or less, preferably light in the ultraviolet wavelength range of 260 to 280 nm (hereinafter referred to as ultraviolet light). The ultraviolet light emitting elements 31 emit only ultraviolet light and do not emit light in other wavelength ranges including light in the visible light wavelength range (hereinafter referred to as visible light). The ultraviolet light emitting elements 31 are semiconductor light emitting elements such as ultraviolet LEDs. The ultraviolet light emitting elements 31 may be of a flip chip type that is surface-mounted on the wiring pattern 32 of the substrate 30, or may be of a face-up type that is electrically connected to the wiring pattern 32 of the substrate 30 via a wire.

[0017] The ultraviolet light emitting element 31 is configured such that the ultraviolet light distribution angle θ centered on the optical axis Z perpendicular to the surface opposite to the substrate 30 is, for example, about 120°. The light emitting module 16 is attached to the heat sink 17 and disposed at the lower side in the main body 15, and the optical axis Z is oriented upward, for example, in the vertical direction. The light emitting module 16 is disposed at a position closer to the opening 27 side, which is the front side, than the center in the front-rear direction of the main body 15. Specifically, when viewed in the cross-sectional direction shown in FIG. 2, the light emitting module 16 is disposed so that the center of the ultraviolet light emitting element 31 is located closer to the opening 27 side than the center of the lower surface part 23 of the main body 15. With this arrangement, the primary ultraviolet light from the ultraviolet light emitting element 31 is not directly emitted in the direction of people, and the light irradiated from the ultraviolet light emitting element 31 can be efficiently extracted to the outside, which is expected to improve the sterilization efficiency.

[0018] In addition, the heat sink 17 is mainly composed of a metal material such as copper (Cu) or aluminum (Al) that has good heat dissipation properties, or an inorganic material such as aluminum nitride (AlN), aluminum oxide (Al2O3), or silicon nitride (Si3N4) that is resistant to deterioration by ultraviolet rays.

[0019] The heat sink 17 is provided in a generally long plate shape that is thicker than the reflector 18. The heat sink 17 is disposed along the longitudinal direction on the lower side inside the main body 15. The back side of the substrate 30 of the light emitting module 16 is attached in contact with the upper surface of the heat sink 17, and the heat sink 17 and the substrate 30 are thermally connected.

[0020] In addition, the reflector 18 is mainly composed of a metal material such as copper (Cu) or aluminum (Al) that has good heat dissipation properties, or an inorganic material such as aluminum nitride (AlN), aluminum oxide (Al2O3), or silicon nitride (Si3N4) that is resistant to deterioration by ultraviolet rays.

[0021] The reflector 18 is configured to be provided separately from the heat sink 17 and thermally connected to the heat sink 17, but may be provided integrally with the heat sink 17.

[0022] The reflector 18 has a substantially cylindrical cross section and is provided long and has substantially the same dimensions as the heat sink 17 in the longitudinal direction. An opening (reflector opening) 35 constituting the emission section 26 is formed on the front side of the reflector 18. The inner surface of the reflector 18 is formed into a reflective surface 36 that reflects ultraviolet light and visible light. The reflective surface 36 is formed to have high reflectance characteristics, such as a mirror surface. The cross-sectional shape of the reflective surface 36 that intersects with the longitudinal direction may be an arc shape with the same radius as a whole, or may be provided with different reflective surface shapes, for example, in an upper surface region facing the optical axis Z of the ultraviolet light emitting element 31 and a back surface region facing the opening 35 where the internal phosphor 19 is disposed.

[0023] Also, a protrusion 37 protrudes forward from the lower side of the opening 27 of the main body 15. The protrusion 37 is disposed over the entire width direction (longitudinal direction) of the opening 27 of the main body 15, and is formed in an arc shape with the inner surface side facing the inside of the reflector 18 being a concave curved surface and the outer surface side being a convex curved surface, but may be formed in a straight line. The inner surface side of the protrusion 37 is formed on the reflective surface 36, and is configured as a part of the reflector 18. Note that the protrusion 37 may be, for example, black to suppress light reflection, or may be configured as a separate body from the reflector 18. The protrusion 37 is disposed outside the range of the light distribution angle θ of the ultraviolet light emitting element 31, and is not irradiated with the primary ultraviolet light from the ultraviolet light emitting element 31. In other words, the protrusion 37 is not directly irradiated with the light irradiated from the ultraviolet light emitting element 31. Also, the protrusion 37 is irradiated with the secondary ultraviolet light from the ultraviolet light emitting element 31. In other words, the protrusion 37 is positioned on the optical path of light (such as ultraviolet light reflected by the reflector 18) emitted downward from the emission portion 26 of the main body 15, and is configured as a shielding portion 38 that blocks the irradiation of ultraviolet light downward.

[0024] The internal phosphor 19 is formed, for example, by coating, along the longitudinal direction of the reflector 18 on the inner surface of the rear side of the reflector 18 (the surface opposite to the surface facing the rear surface 24), at least a part of which faces the opening 35. An emission section 26 is formed in a normal direction (for example, the direction A in FIG. 2) perpendicular to a tangent line that contacts at least a part of the surface on which the internal phosphor 19 is formed. At least a part of the internal phosphor 19 is disposed within the range of the light distribution angle θ of the ultraviolet light emitting element 31, and preferably the entirety of the internal phosphor 19 is disposed, and the primary ultraviolet light from the ultraviolet light emitting element 31 is directly incident on the internal phosphor 19. The internal phosphor 19 is excited by the incidence of ultraviolet light and emits visible light. The visible light emitted by the internal phosphor 19 desirably contains at least a UV-A wavelength component of 360 nm to 420 nm. The internal phosphor 19 is a phosphor disposed in the reflector 18. In this embodiment, reflector 18 is referred to as internal phosphor 19 because it is disposed within main body 15, but internal phosphor 19 does not have to be disposed within main body 15. For example, reflector 18 may have a structure that protrudes from main body 15 in a shape different from protrusion 37, and internal phosphor 19 may be disposed at the protruding portion of reflector 18.

[0025] For example, the lower side of the internal phosphor 19 may be positioned above the lower side of the opening 35. Most of the light reflected at the lower side of the opening 35 or converted by the internal phosphor 19 is extracted from the opening 35 upward (e.g., toward the ceiling). Since the visible light extracted upward from the opening 35 does not contribute much to improving visibility, it is preferable that the lower side of the internal phosphor 19 is positioned above the lower side of the opening 35. Also, the upper side of the internal phosphor 19 may be positioned below the upper side of the opening 35. With this configuration, it is possible to suppress the light converted by the internal phosphor 19 from being reflected by the reflector 18 above the opening 35, and it is expected that more visible light will be extracted to the outside. In other words, it is expected that the visibility of visible light will be improved. Also, the upper side of the internal phosphor 19 may be positioned above the upper side of the opening 35. Most of the light reflected at the upper side of the opening 35 or converted by the internal phosphor 19 is extracted from the opening 35 downward (e.g., toward the floor surface). Therefore, it is expected that the visible light extracted downward from the opening 35 easily reaches the human eye and contributes to improving visibility. In this way, it is desirable to form the reflector 18 (internal phosphor 19) so that ultraviolet rays are predominantly extracted from the upper side (upper half) of the opening 35 and visible light is predominantly extracted from the lower side (lower half) of the opening 35. Here, the term "predominant" refers to, for example, the magnitude of the radiant flux. A greater radiant flux of ultraviolet rays is extracted from the upper side (upper half) of the opening 35, and a greater radiant flux of visible light is extracted from the lower side (lower half) of the opening 35. Here, the term "predominant" refers to, for example, the ratio of light. The upper side (upper half) of the opening 35 is configured to extract a specified number or more of ultraviolet rays than the lower side (lower half) of the opening 35, and the lower side (lower half) of the opening 35 is configured to extract a specified number or more of visible light than the visible light extracted from the upper side (upper half) of the opening 35. The specified number here is determined by a value indicating the output of light (radiant flux, spectral intensity, illuminance, luminous flux, etc.). For example, the specified number is set to 10, but it may be any multiple.

[0026] The power supply device converts AC power from, for example, a commercial AC power source into a predetermined DC power and supplies it to the light-emitting module 16 to light up the ultraviolet light-emitting element 31. The power supply device is disposed, for example, inside or outside the main body 15. When disposed inside the main body 15, it is disposed between the lower surface portion 23 or the rear surface portion 24 and the reflector 18, and when disposed outside the main body 15, it is disposed on the upper surface or rear surface of the main body 15. The power supply device may be disposed on the ceiling or the mounting device 12.

[0027] The mounting device 12 also includes a support installed on the ceiling surface, a pipe 41 whose upper end is attached to the support and whose lower end has the ultraviolet ray emission device 11 attached thereto, and a cover 42 that covers the support. A power line from the ceiling is routed inside the pipe 41 and electrically connected to the power supply device. The mounting device 12 may suspend the ultraviolet ray emission device 11 using a suspender such as a chain or wire, and electrically connect the power line to the power supply device.

[0028] Then, when power is supplied to the power supply device of the ultraviolet emitting device 11, the ultraviolet light emitting element 31 is turned on and ultraviolet light is emitted from the ultraviolet light emitting element 31. A part of the primary ultraviolet light emitted from the ultraviolet light emitting element 31 is irradiated onto the upper region of the reflector 18 located on the optical axis Z, a further part is emitted to the outside through the opening 35, and a further part is irradiated onto the internal phosphor 19.

[0029] The ultraviolet light irradiated to the reflector 18 is reflected by the reflecting surface 36, and part of the reflected ultraviolet light is emitted to the outside through the opening 35, and part of the reflected ultraviolet light is reflected inside the reflector 18 and emitted to the outside through the opening 35, and part of the reflected ultraviolet light is irradiated to the internal phosphor 19.

[0030] The internal phosphor 19 is excited by irradiation with ultraviolet light, and emits visible light. A part of the visible light emitted from the internal phosphor 19 is directly emitted to the outside from the opposing opening 35, a further part is irradiated onto the reflecting surface 36 of the reflector 18, and the visible light reflected by the reflecting surface 36 is emitted to the outside from the opening 35 or irradiated onto the internal phosphor 19. Since the internal phosphor 19 emits visible light in all directions, the reflecting surface 36 of the reflector 18 onto which the visible light is irradiated is the entire area including the back area where the internal phosphor 19 is formed. Therefore, the visible light emitted from the internal phosphor 19 toward the back is reflected by the reflecting surface 36 of the back area of ​​the reflector 18 and reflected forward.

[0031] A protrusion 37, i.e., a shielding portion 38, protrudes from the lower side of the opening 27 of the main body 15, thereby blocking ultraviolet rays traveling downward from inside the reflector 18 through the opening 27, thereby suppressing the irradiation of ultraviolet rays downward.

[0032] In addition, the heat generated by the ultraviolet light-emitting element 31 is transmitted to the heat sink 17, and the heat generated by the phosphor upon excitation is transmitted to the reflector 18, from which it is dissipated into the air, and further from which it is transmitted from the heat sink 17 and the reflector 18 to the main body 15, from which it is dissipated into the air.

[0033] When the ultraviolet light emitting element 31 of the ultraviolet radiation device 11 is turned on, visible light is emitted from the internal phosphor 19, and the visible light emitted from the internal phosphor 19 is further emitted to the outside through the opening 27 and irradiated onto the ceiling surface, etc., and onto the reflective surface 36 of the reflector 18. By visually checking this visible light, it is possible to confirm that ultraviolet rays are being radiated.

[0034] In the ultraviolet radiation device 11 of this embodiment, at least a portion of the internal phosphor 19 is positioned opposite the emission section 26, i.e., the normal direction perpendicular to the tangent line contacting at least a portion of the internal phosphor 19 is aligned with the emission section 26, thereby improving the visibility of the visible light emitted from the internal phosphor 19 and making it easier to confirm that ultraviolet radiation is being emitted.

[0035] Furthermore, at least a portion of the internal phosphor 19 is positioned within the range of the light distribution angle θ of the ultraviolet light-emitting element 31, and the primary ultraviolet light from the ultraviolet light-emitting element 31 is directly incident on the internal phosphor 19, thereby improving the radiation efficiency of visible light from the internal phosphor 19 and improving the visibility of the visible light.

[0036] Furthermore, when the visible light emitted by the internal phosphor 19 contains UV-A wavelength components of 360 nm to 420 nm, active oxygen is generated at the location where the visible light is irradiated, thereby enhancing the sterilization effect.

[0037] Furthermore, since the ultraviolet absorption spectrum of DNA has an absorption peak wavelength at 260 nm and the absorption value at 300 nm is less than 1 / 25 of the peak value, an efficient sterilization effect can be obtained by setting the wavelength of the ultraviolet light emitted by the ultraviolet light-emitting element 31 to 300 nm or less, preferably 260 to 280 nm.

[0038] In addition, since a protrusion 37, which is a shielding portion 38, protrudes forward from the lower side of the opening 27 of the main body 15, it is possible to block ultraviolet rays traveling downward from within the main body 15 through the opening 27, thereby suppressing the irradiation of ultraviolet rays downward.

[0039] In addition, the heat sink 17 has a large mass in order to ensure the thermal capacity to absorb the heat generated by the ultraviolet light emitting element 31, but since it is arranged on the lower side of the main body 15, the posture of the ultraviolet radiation device 11 when suspended can be stabilized.

[0040] Next, a second embodiment is shown in FIG.

[0041] The protruding portion 37 constitutes a visible light emitting portion 50 instead of constituting the shielding portion 38 in the first embodiment. The visible light emitting portion 50 includes a transparent visible light transmitting member 51 that transmits visible light, and an external phosphor 52 provided on the inner surface of the visible light transmitting member 51. The external phosphor 52 is a phosphor disposed on the protruding portion 37. In the present embodiment, the protruding portion 37 is called the external phosphor 52 because it is disposed outside the main body 15, but the external phosphor 52 does not have to be disposed outside the main body 15. For example, the protruding portion 37 may be disposed so as to be located also inside the main body 15, and the external phosphor 52 may be disposed at a portion of the protruding portion 37 located inside the main body 15.

[0042] The visible light transmitting member 51 is made of transparent glass that transmits visible light. Note that the visible light transmitting member 51 may be made mainly of an inorganic material, such as borosilicate glass, that is resistant to deterioration by ultraviolet light, absorbs ultraviolet light, and transmits visible light.

[0043] The external phosphor 52 is excited by the incidence of ultraviolet light and emits visible light. The external phosphor 52 may be configured to emit only visible light and not transmit ultraviolet light, i.e., not emit ultraviolet light. It is desirable that the visible light emitted by the external phosphor 52 contains at least a UV-A wavelength component of 360 nm to 420 nm, similar to the internal phosphor 19.

[0044] When the ultraviolet light emitting element 31 is turned on, part of the ultraviolet light reflected by the reflecting surface 36 of the reflector 18 is irradiated onto the external phosphor 52. The external phosphor 52 is excited by the irradiation of the ultraviolet light and emits visible light. Part of the visible light emitted from the external phosphor 52 passes through the visible light transmitting member 51 and is irradiated to the outside, and a further part is irradiated into the interior of the reflector 18.

[0045] Therefore, the visible light radiating portion 50 and the inside of the reflector 18 shine, the visibility of the visible light is improved, and it becomes easier to confirm that ultraviolet rays are being radiated.

[0046] When the visible light emitting section 50 is provided, the internal phosphor 19 is not necessary. However, by providing the internal phosphor 19, the visibility of visible light can be further improved.

[0047] In each of the above-described embodiments, the emission part 26 may be closed with a cover that is transparent to ultraviolet light and visible light. In this case, for example, by providing vents at both ends of the main body 15 and providing a fan on at least one end side, the air can be circulated between the outside and inside of the main body 15 by the fan, thereby improving the sterilization efficiency of the air and improving the heat dissipation.

[0048] Although the ultraviolet ray irradiating device 11 has been described as a hanging type, it may also be applied to a direct mounting type or a built-in type that is installed on a wall surface or the like.

[0049] In the above embodiment, the light emitting module 16 and the heat sink 17 are disposed on the lower surface 23 side of the main body 15. However, the light emitting module 16 and the heat sink 17 may be disposed on the upper surface 22 side of the main body 15. In this case, a gap is disposed on the upper side of the reflector 18, and the light emitting module 16 and the heat sink 17 are disposed in the gap. Then, light is emitted downward from the light emitting module 16. The position of the protruding portion 37 is the same as in the above embodiment. (The same position as in Figs. 2 and 3). In addition, when the light emitting module 16 and the heat sink 17 are disposed on the upper surface 22 side of the main body 15, it is preferable that the light emitting module 16 is disposed at a position closer to the rear surface 24 of the main body 15, which is the rear side, than the center in the front-rear direction of the main body 15. In other words, it is preferable that the light emitting module 16 is disposed so that the center of the ultraviolet light emitting element 31 is located on the rear surface 24 side of the center of the upper surface 22 of the main body 15.

[0050] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0051] 11 Ultraviolet radiation device 15 Main unit 18 Reflector 19 Internal phosphor 26 Emission section 27 Opening 31 Ultraviolet light emitting element 37 Protrusion 50 Visible light emitting part 51 Visible light transmitting material 52 External phosphor

Claims

1. A reflector having an emission part capable of emitting light generated inside to the outside; an ultraviolet light emitting element provided inside the reflector and emitting light in an ultraviolet wavelength range; an internal phosphor provided inside the reflector, at least a portion of which faces the emission part, and which is excited by light in the ultraviolet wavelength range to emit light in the visible range; Equipped with Light in the ultraviolet wavelength range is predominantly emitted from an upper portion of the emission section, and light in the visible range is predominantly emitted from a lower portion of the emission section.

1. An ultraviolet radiation device comprising:

2. A body having an opening; a reflector having an emission part capable of emitting light generated inside to the outside, the reflector being disposed within the main body such that the emission part is included in the opening; an ultraviolet light emitting element provided inside the reflector and emitting light in an ultraviolet wavelength range; a protrusion provided with a visible light emitting unit having an external phosphor that is excited by light in the ultraviolet wavelength range and emits light in the visible range, the protrusion being disposed so as to protrude outward from the opening; An ultraviolet radiation device comprising:

3. A body having an opening; a reflector having an emission part capable of emitting light generated inside to the outside, the reflector being disposed within the main body such that the emission part is included in the opening; an ultraviolet light emitting element provided inside the body and emitting light in an ultraviolet wavelength range; an internal phosphor provided inside the body, at least a portion of which faces the opening, and which is excited by light in the ultraviolet wavelength range to emit light in the visible range; a protrusion provided with a visible light emitting unit having an external phosphor that is excited by light in the ultraviolet wavelength range and emits light in the visible range, the protrusion being disposed so as to protrude outward from the opening; An ultraviolet radiation device comprising:

4. A normal direction perpendicular to a tangent line contacting at least a part of the internal phosphor coincides with the exit portion.

4. An ultraviolet ray irradiating device according to claim 1 or 3.

5. The protrusion is made of a visible light transmitting material.

4. An ultraviolet ray irradiating device according to claim 2 or 3.

6. Light in the ultraviolet wavelength range is predominantly emitted from an upper portion of the emission section, and light in the visible range is predominantly emitted from a lower portion of the emission section.

4. An ultraviolet ray irradiating device according to claim 2 or 3.

7. The visible light emitted by the internal phosphor contains at least wavelength components from 360 nm to 420 nm.

5. An ultraviolet ray irradiating device according to claim 1, 3 or 4.

8. The visible light emitted by the external phosphor contains at least wavelength components from 360 nm to 420 nm.

4. An ultraviolet ray irradiating device according to claim 2 or 3.

9. The ultraviolet wavelength range of the light emitted by the ultraviolet light emitting element is 300 nm or less.

9. An ultraviolet radiation device according to claim 1, wherein the ultraviolet radiation device is a UV ray emitting device.

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