WO2023042792A1 - Ultraviolet irradiation device - Google Patents

Abstract

Provided is an ultraviolet irradiation device which has excellent waterproof properties, anti-drip properties, and anti-dust properties, and for which degradation caused by ultraviolet irradiation due to usage over a long period of time is suppressed. The ultraviolet irradiation device comprises: a substrate having a first surface and a second surface; at least one ultraviolet light-emitting element that is provided on the first surface of the substrate and can emit deep ultraviolet rays; a translucent member that is translucent and has a first surface and a second surface, the second surface being provided so as to face the at least one ultraviolet light-emitting element; a case part which has an opening peripheral edge portion forming a window part, and is for fixing the translucent member at the opening peripheral edge portion; and an adhesive member for adhering the translucent member and the opening peripheral edge portion of the case part. The opening peripheral edge portion faces the first surface of the translucent member and includes a first recess that is formed by a continuous curved surface and is for receiving the adhesive member. One end of the first recess is configured to form a channel having a prescribed gap from the lateral end surface of the translucent member.

Description

UV irradiation device

The present invention relates to an ultraviolet irradiation device, and more particularly to an ultraviolet irradiation device that emits ultraviolet rays for inactivating and sterilizing various viruses and bacteria.

Conventionally, in order to inactivate, sterilize, and sterilize pathogenic viruses and bacteria adhering to the surface of an object such as human hands and objects, a technique of irradiating the surface of the object with ultraviolet rays has been known. (In the present disclosure, viruses, fungi, etc. are collectively referred to as "viruses, etc.", and inactivating viruses and/or sterilizing and sterilizing bacteria is referred to as "inactivating viruses, etc.". ). In recent years, the development of ultraviolet light emitting devices (UVC-LEDs) capable of irradiating ultraviolet rays with a wavelength of about 220 nm (sometimes referred to as “deep ultraviolet rays”) has progressed rapidly, replacing conventional mercury lamps. It is attracting attention as a UV light source. Ultraviolet irradiators using ultraviolet light emitting elements are capable of power saving and miniaturization compared to conventional mercury lamps, and are being proposed for use in various environments and applications.

For example, when an ultraviolet irradiation device using such an ultraviolet light emitting element is used in an environment where humidity is high and dust is likely to occur, such as an indoor unit of an air conditioner (air conditioner), waterproof and drip-proof・Dust-proof design must be fully considered. On the other hand, depending on the materials used, they are prone to deterioration due to exposure to ultraviolet rays, so materials and structures that are durable against ultraviolet rays are also used so that waterproof, drip-proof, and dust-proof properties will not be impaired even after long-term use. need to be fully considered.

For example, the following patent document 1 discloses an ultraviolet light emitting diode encapsulation package that includes a chip that generates ultraviolet rays, a substrate that supports the chip, a glass cover that covers the chip, and an adhesive structure that adheres the glass cover to the substrate. Disclose the structure.

In addition, Patent Document 2 below discloses a light emitting device having a transparent window sealing structure. Specifically, Patent Document 2 discloses a body having a cavity and a stepped structure around the cavity, a plurality of electrodes arranged in the cavity, a light-emitting chip arranged in the cavity, and a cover over the cavity. discloses a light-emitting device including a transparent window having a stepped structure on the outside and an adhesive member disposed between the transparent window and the body.

JP 2019-029645 A JP 2016-119477 A

However, in the ultraviolet light emitting diode sealing package structure disclosed in Patent Document 1, the adhesive structure is directly irradiated with ultraviolet rays, so that the adhesive structure deteriorates due to the irradiation of ultraviolet rays over time. There is a problem that the sealing property is impaired. Moreover, in the manufacturing process of such a package structure, it is difficult to bond the glass cover while maintaining the position thereof, which causes a problem of positional displacement.

In addition, in the light-emitting element disclosed in Patent Document 2, the gas generated when the adhesive member is cured remains in the space where the light-emitting element is sealed, and the gas causes the light-emitting element and its surroundings to become damaged during long-term use. There is a risk of degrading the material.

Therefore, an object of the present invention is to provide an ultraviolet irradiation device that is excellent in waterproofness, dripproofness, and dustproofness, and has a configuration that can suppress deterioration due to ultraviolet irradiation even after long-term use.

More specifically, one of the objects of the present invention is to securely fix a translucent member facing an ultraviolet light emitting element to an opening of a case so that a sealed space for housing the ultraviolet light emitting element is formed. It is an object of the present invention to provide an ultraviolet irradiation device having a configuration that obtains the desired effect.

Another object of the present invention is to provide an ultraviolet irradiation device having a configuration capable of preventing deterioration of an adhesive member due to ultraviolet rays emitted from an ultraviolet light emitting element.

Another object of the present invention is to prevent the gas generated when the adhesive member for securely fixing the translucent member to the case from entering the sealed space containing the ultraviolet light emitting element. An object of the present invention is to provide an ultraviolet irradiation device having a structure.

Another object of the present invention is to provide an ultraviolet irradiation device having a structure in which ultraviolet rays emitted by an ultraviolet light emitting element can be efficiently extracted to the outside from an opening of a case portion provided with a translucent member. That is.

The present invention for solving the above problems includes the invention specifying matters or technical features shown below.

According to one aspect of the present invention, a substrate having a first surface and a second surface; at least one ultraviolet light emitting element provided on the first surface of the substrate and capable of emitting deep ultraviolet rays; a light-transmitting member having a light-transmitting property provided so that the second surface faces the at least one ultraviolet light emitting element; and an opening peripheral portion forming a window portion, the opening. The ultraviolet irradiation device includes a case portion for fixing the light-transmitting member at a peripheral portion, and an adhesive member for bonding the light-transmitting member and the opening peripheral portion of the case portion. The opening peripheral portion includes a first concave portion facing the first surface of the translucent member and for receiving the adhesive member. One end portion of the first recess is configured to form a channel having a predetermined gap with the side end face of the translucent member.

Here, the opening peripheral portion may further include a second recess that communicates with the first recess via the channel.

The second recess may be formed toward the distal side from the side end face of the translucent member.

An intervening body interposed between the substrate and the light-transmitting member supports the light-transmitting member such that the second surface of the light-transmitting member has a predetermined distance from the at least one ultraviolet light emitting element. be prepared.

The first surface of the interposer can face the second recess so as to form a predetermined space.

The size of the peripheral edge formed by the one end portion of the first recess is preferably 105% or less of the size of the peripheral edge formed by the side end face of the translucent member.

The length of the channel along the side end surface of the light-transmitting member is preferably 1/3 to 2/3 of the thickness of the light-transmitting member.

An aperture angle formed by a virtual line on a two-dimensional plane connecting the opening peripheral portion with the at least one ultraviolet light emitting element as a vertex may be equal to or larger than the directivity angle of the at least one ultraviolet light emitting element. Here, the magnitude of the opening angle is preferably 150 degrees or more.

The opening peripheral portion of the case portion may be inclined based on the opening angle.

The thickness of the translucent member is preferably 5 mm or less.

The distance between the at least one ultraviolet light emitting element and the second surface of the translucent member is preferably 1 mm or less.

According to another aspect of the present invention, there is provided a substrate having a first surface and a second surface; at least one ultraviolet light emitting element provided on the first surface of the substrate and capable of emitting deep ultraviolet rays; and a second surface, and the second surface is provided so as to face the at least one ultraviolet light emitting element; and a case portion that houses the at least one ultraviolet light emitting element and the light transmitting member. and an adhesive member for bonding the translucent member and the case part. The case portion has an opening peripheral edge portion that faces the peripheral edge portion of the translucent member and forms a window portion. Further, the distance between the first surface of the substrate and the second surface of the light-transmitting member is D1, and the first surface of the substrate and the portion of the opening peripheral edge that contacts the peripheral edge of the light-transmitting member D2 is the distance between the first surface of the substrate and a portion of the opening peripheral edge portion facing but not in contact with the peripheral edge portion of the light-transmitting member D3; D3 is the distance between the first surface of the substrate and the opening When the distance between the peripheral portion and the portion of the translucent member that does not face the peripheral portion is D4, the relationship between the distances D1 to D4 is as follows:
D1<D4<D2<D3
meet.
Further, the adhesive member is continuously present in at least a portion of the opening peripheral edge portion and the peripheral edge portion of the translucent member facing each other.
UV irradiation device

Further, the present invention according to still another aspect is a case portion (casing) attached to a substrate of an ultraviolet light emitting device. The casing includes a contact portion including a surface that contacts the substrate, and an opening peripheral portion formed with a window. The opening peripheral portion includes an inner peripheral portion defining the window portion, a first outer peripheral portion positioned outside the inner peripheral portion, and a second outer peripheral portion positioned outside the first outer peripheral portion. . Further, a distance between a virtual plane including the surface of the contact portion and the first outer peripheral portion is greater than a distance between the virtual plane and the inner peripheral portion, and the virtual plane and the second outer peripheral portion is designed to be smaller than the distance between the virtual plane and the inner periphery.

In this specification and the like, means does not simply mean physical means, but also includes the case where the functions of the means are realized by software. Also, the function of one means may be realized by two or more physical means, or the functions of two or more means may be realized by one physical means. In addition, "system" refers to a logical assembly of multiple devices (or functional modules that implement specific functions). does not matter.

According to the present invention, it is possible to obtain an ultraviolet irradiation device that has excellent waterproof, drip-proof, and dust-proof properties, and has a structure that does not easily deteriorate even after long-term use.

Other technical features, objects, effects or advantages of the present invention will be made clear by the following embodiments described with reference to the attached drawings. The effects described in this specification are only examples and are not limiting, and other effects may also occur.

FIG. 1 is a perspective view showing a schematic appearance of an ultraviolet irradiation device according to one embodiment of the present invention. FIG. 2 is a plan view of an ultraviolet irradiation device according to one embodiment of the present invention. FIG. 3 is a side cross-sectional view of an ultraviolet irradiation device according to one embodiment of the present invention. FIG. 4 is a schematic diagram for explaining an example of the configuration in the vicinity of the ultraviolet light emitting element of the ultraviolet irradiation device according to one embodiment of the present invention. FIG. 5A is a diagram showing another configuration example to be compared with the configuration in the vicinity of the ultraviolet light emitting element of the ultraviolet irradiation device according to one embodiment of the present invention. FIG. 5B is a diagram showing still another configuration example compared with the configuration in the vicinity of the ultraviolet light emitting element of the ultraviolet irradiation device according to the embodiment of the present invention. FIG. 6 is a diagram for explaining the relationship between the ultraviolet light emitting element of the ultraviolet irradiation device according to the embodiment of the present invention and the opening peripheral portion of the case portion.

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described below. The present invention can be implemented in various modifications (for example, by combining each embodiment) without departing from the scope of the invention. In addition, in the description of the drawings below, the same or similar parts are denoted by the same or similar reference numerals. The drawings are schematic and do not necessarily correspond to actual dimensions, proportions, and the like. Even between the drawings, there are cases where portions with different dimensional relationships and ratios are included.

FIG. 1 is a perspective view showing a schematic appearance of an ultraviolet irradiation device according to one embodiment of the present invention. As shown in the figure, the external shape of the ultraviolet irradiation device 1 is defined by a case portion 10 . The case part 10 is molded using, for example, a highly heat-conductive polycarbonate (PC) resin material. Although not shown in the figure, the case portion 10 is configured to be coupled to the base portion 40 at its bottom (see FIG. 3). Further, as will be described later, the ultraviolet irradiation device 1 includes at least one ultraviolet light emitting element 30 capable of emitting deep ultraviolet rays (UVC) inside the case portion 10 .

The main portion of the case portion 10 has a substantially rectangular shape in a plan view, and a window portion 11 ′ defined by a substantially circular opening peripheral portion 11 is formed on the upper surface thereof. The window portion 11 ′ is an opening through which ultraviolet rays emitted from the ultraviolet light emitting elements 30 housed inside the case portion 10 are radiated to the outside. In this example, the window portion 11' is formed in a substantially circular shape, but it is not limited to this. A translucent member 60 for sealing the ultraviolet light emitting element 30 is provided in the window portion 11 ′. As will be described later, the translucent member 60 is fixed to the case portion 10 at the opening peripheral edge portion 11 via an intermediate member 50 (see FIG. 3).

A cable interface portion 12 is formed at one end of the main portion of the case portion 10 . The cable interface portion 12 is a portion that guides an electric cable 80 extending from an electric connector (not shown) housed inside the case portion 10 to the outside. The cable interface portion 12 includes, for example, a detachable fastener portion 121 (see FIG. 3). The fastener portion 121 is attached and detached when attaching or detaching an electric connector inside the case portion 10 . Further, on the outer periphery of the main portion of the case portion 10, several fixing portions 13 (three in this example) are provided for fixing the ultraviolet irradiation device 1 to a desired place such as a wall with screws or the like. .

FIG. 2 is a plan view of an ultraviolet irradiation device according to one embodiment of the present invention. 3 is a side cross-sectional view of an ultraviolet irradiation device according to an embodiment of the present invention, and more specifically, a III-III' cross-sectional view of the ultraviolet irradiation device shown in FIG.

As shown in these figures, inside the case part 10, an ultraviolet light emitting element 30 placed on the first surface (upper surface) of the substrate 20 is provided (in FIG. It is assumed that the substrate 20 is visible.). Although not shown, the ultraviolet light emitting element 30 is electrically connected to wiring on the second surface (lower surface) via through holes in the substrate 20, for example. The substrate 20 has, for example, a substantially rectangular shape along the shape of the main portion of the case portion 10 in plan view. The board 20 is, for example, a printed board conforming to FR4 (Flame Retardant Type 4), but is not limited to this, and may be, for example, a ceramic board or an aluminum board. A receptacle, for example, is provided at one end on the second surface of the substrate 20 to which an electrical connector is attached. The substrate 20 is bonded and fixed onto the base portion 40 of the case portion 10 .

The ultraviolet light emitting element 30 is a UVC-LED that emits ultraviolet rays (that is, deep ultraviolet rays) having a peak wavelength of, for example, 200 to 400 nm, preferably 220 to 300 nm, and more preferably around 265 nm from the viewpoint of inactivating viruses and the like. be. Although only one ultraviolet light emitting element 30 is provided in this example, the present invention is not limited to this, and a configuration in which a plurality of ultraviolet light emitting elements 30 are provided may be employed. Also, a configuration in which several ultraviolet light emitting elements 30 having different wavelengths are provided may be used. The ultraviolet light emitting element 30 emits pulsed light at a predetermined frequency according to a driving signal generated by a control circuit (not shown). As a result, the object is irradiated with ultraviolet rays, and viruses and the like exposed to the ultraviolet rays are inactivated.

The base portion 40 is a member forming part of the bottom portion of the ultraviolet irradiation device 1 . The base portion 40 is joined to the peripheral portion of the main portion of the case portion 10 by, for example, heat sealing. A space for accommodating the receptacle of the case portion 10 is complementarily formed in the base portion 40 . The base portion 40 can efficiently diffuse and dissipate the heat generated by the light emission of the ultraviolet light emitting element 30 , which is conducted through the substrate 20 . The base portion 40 is made of, for example, the same PC resin material as the case portion 10, but is not limited to this.

Also placed on the substrate 20 is an intervening body 50 in the form of, for example, an annular plate, which is formed so as to surround the ultraviolet light emitting element 30 with the ultraviolet light emitting element 30 at the center. The intervening member 50 is a member that supports the light-transmitting member 60 so that the light-transmitting member 60 faces the ultraviolet light emitting element 30 with a predetermined gap. It is preferable that the gap between the ultraviolet light emitting element 30 and the translucent member 60 is as small as possible so as to ensure a sufficient amount of effective ultraviolet rays. On the other hand, it is also necessary to consider the deflection amount when the translucent member 60 is given stress from the outside. In this example, the translucent member 60 is supported by the intermediate body 50 so as to have a predetermined gap (for example, approximately 1 mm) from the ultraviolet light emitting element 30 . The interposer 50 is made of, for example, PTFE (Poly Tetra Fluoro Ethylene), but is not limited to this. PTFE is advantageous in that it has insulating properties, has high ultraviolet reflectance, and is less susceptible to deterioration due to exposure to ultraviolet light.

The translucent member 60 is a member that transmits ultraviolet rays emitted from the ultraviolet light emitting elements 30 while protecting the ultraviolet light emitting elements 30 . The light-transmitting member 60 accommodates the ultraviolet light emitting element 30 by organic bonding with the case portion 10, the substrate 20, and/or the intervening body 50, forms a space for hermetically sealing, and prevents water droplets and moisture. and/or protect the ultraviolet light emitting element 30 from dust. The thickness of the translucent member 60 is preferably 5 mm or less, for example. Further, as described above, the distance between the translucent member 60 and the ultraviolet light emitting element 30 is defined by the interposed body 50 .

The light-transmitting member 60 is, for example, disc-shaped fused quartz glass, but is not limited to this, and any material that is less likely to deteriorate due to exposure to ultraviolet rays may be used, such as synthetic quartz glass, artificial crystal, or artificial sapphire. good. Fused silica glass is an industrially suitable material because it has a high transmittance to ultraviolet rays, has no or almost no deterioration due to exposure to ultraviolet rays, and is available at a relatively low cost. In this example, the translucent member 60 is adhesively fixed to the lower portion of the opening peripheral portion 11 of the case portion 10 via an adhesive member 70 (see FIG. 4). As will be described later, a first recess 111 and a second recess 112 capable of receiving the bonding portion 70 are formed in the bottom surface of the opening peripheral portion 11 .

FIG. 4 is a schematic diagram for explaining an example of the configuration in the vicinity of the ultraviolet light emitting element of the ultraviolet irradiation device according to one embodiment of the present invention. That is, this figure is a partially enlarged side cross-sectional view schematically showing the configuration in the vicinity of the ultraviolet light emitting element 30 mounted on the substrate 20 in the ultraviolet irradiation device shown in FIG.

As described above, the case portion 10 has the opening peripheral portion 11 forming the window portion 11'. The opening peripheral portion 11 is inclined, for example, so as to become lower toward the inside (toward the center). As a result, most of the ultraviolet rays emitted from the ultraviolet light emitting element 30 can be efficiently emitted to the outside.

The opening peripheral portion 11 positions the translucent member 60 and adheres it with an adhesive member 70 . In this example, at least a portion of the opening peripheral edge 11 is formed to face the peripheral edge of the translucent member 60, and has a first recess 111 at its lower end for receiving the adhesive member 70. there is The first concave portion 111 is formed in a groove shape so as to surround the window portion 11 ′ along the opening peripheral portion 11 . In other words, the opening peripheral edge portion 11 includes an inner peripheral portion 11a that defines the outer edge of the window portion 11′, a first outer peripheral portion 11b that is positioned outside the inner peripheral portion and includes the first recess 111, and a first outer peripheral portion 11b that is positioned outside the inner peripheral portion. and a second outer peripheral portion 11c located outside the portion. The second outer peripheral portion 11c includes a second recessed portion 112, which will be described later.

For example, the first concave portion 111 is formed with a continuous curved surface having a U-shaped cross section, for example, so that the adhesive member 70 is filled without gaps. In this example, the first concave portion 111 is a groove having a semicircular cross section, but it is not limited to this. There may be, and it may be formed including several polygonal faces. The point is that the adhesive member 70 in a fluid state before hardening should not have a shape that makes it difficult to flow. When the light-transmitting member 60 is attached to the opening peripheral portion 11 , the adhesive member 70 is attached to the first concave portion 111 by an amount slightly larger than the volume of the space formed by the first concave portion 111 and the light-transmitting member 60 facing the first recess portion 111 . is injected into the recess 111 of the

One end (second outer peripheral portion 11c) of the first concave portion 111 on the outer peripheral side interferes with the side end portion of the light-transmitting member 60 so that the light-transmitting member 60 can be positioned. portion (inner peripheral portion 11a). That is, the height from the deepest part of the first recess 111 to the upper surface of one end on the outer peripheral side is higher than the height from the deepest part to the upper surface of the other end on the inner peripheral side.

Specifically, as shown in the figure, the distance between the first surface of the substrate 20 and the second surface of the light-transmitting member 60 is D1, and the distance between the first surface of the substrate 20 and the opening peripheral portion 11 is 60. D2 is the distance between the first surface of the substrate 20 and the portion of the opening peripheral edge 11 that faces the peripheral edge of the translucent member 60 but is not in contact with it, D3 is the distance of the substrate When the distance between the first surface and the portion of the opening peripheral edge portion that does not face the peripheral edge portion of the light-transmitting member is D4, the relationship between the distances D1 to D4 is as follows:
D1<D4<D2<D3
will satisfy

Also, the size of the peripheral edge formed by one end of the first concave portion 111 is slightly larger than the size of the peripheral edge formed by the side end surface of the translucent member 60 . For example, the size of the peripheral edge formed by one end of the first recess 111 is preferably 105% or less of the size of the peripheral edge formed by the side end surface of the translucent member 60 . Therefore, when the translucent member 60 is arranged so as to face the first concave portion 111, a slight gap is formed. In the present disclosure, the gap formed between one end of the first recess 111 and the side end of the translucent member 60 is referred to as channel 113 .

The opening peripheral edge portion 11 also has a second recessed portion 112 formed so as to face the intermediate body 50 and connected to the first recessed portion 111 at the lower end portion of the second outer peripheral portion 11c. The second recessed portion 112 is formed on the outer peripheral side of the first recessed portion 111, that is, from the side end portion of the translucent member 60 arranged to face the first recessed portion 111 toward the distal side. there is Therefore, the second recess 112 communicates with the first recess 111 through the channel 113 and forms a predetermined space with the first surface of the interposer 50 . This allows the second recess 112 to protrude from the first recess 111 and further receive a portion of the adhesive member 70 that has passed through the channel 113 . In other words, the adhesive member 70 exists continuously in at least a portion of the opening peripheral edge portion 11 and the peripheral edge portion of the translucent member 60 facing each other. As a result, part of the adhesive member 70 in the channel 113 portion contributes to the adhesion of the light-transmitting member 60 , so that the light-transmitting member 60 can be more firmly fixed to the case portion 10 .

The channel 113 is formed between one end of the first recess 111 and the side end of the translucent member 60, as described above. In this example, as shown in the figure, the length L of the channel 113 is defined by the length of interference between one end of the first concave portion 111 and the side end of the translucent member 60. be. Furthermore, the depth of the second recess 112 is the distance from the upper surface of one end of the first recess 111 to the upper surface of the end of the second recess, that is, the length L of the channel 113 from the thickness of the translucent member 60 . is the length obtained by subtracting The length L of the channel 113 is, for example, approximately ⅓ to ⅔ the thickness of the translucent member 60 . As a result, the translucent member 60 can be reliably positioned by the end portion of the first concave portion 111 , and a sufficient amount of the adhesive member 70 can be secured for fixing to the side end surfaces of the translucent member 60 . Become.

With the configuration described above, the adhesive member 70 injected into the first recess 111 is pressed by the lower end portion of the opening peripheral portion 11 and the light-transmitting member 60, so that the adhesive member 70 is inserted into the first recess 111 without any gap. Further, a portion of the adhesive member 70 protruding from the first recess 111 reaches the second recess 112 through the channel 113 and hardens in this state. Therefore, the adhesive member 70 does not flow into the space where the ultraviolet light emitting element 30 is sealed, and the gas generated during curing does not flow into the space, thereby preventing deterioration of the ultraviolet light emitting element 30. be able to.

Here, an example in which the formation of the channel 113 in the ultraviolet irradiation device 1 is inappropriate will be described. For example, FIGS. 5A and 5B are diagrams showing other configuration examples compared with the configuration in the vicinity of the ultraviolet light emitting element of the ultraviolet irradiation device according to one embodiment of the present invention. In these figures, the shape of the second outer peripheral portion 11c of the opening peripheral portion 11 is different.

That is, FIG. 1A shows a case where the length L of the channel 113 in the ultraviolet irradiation device 1 is sufficiently smaller than the thickness t of the translucent member 60 or not (that is, L<<t and t≈D). configuration. In such a case, it becomes difficult to properly position the translucent member 60 with respect to the case portion 10 when bonding the case portion 10 and the translucent member 60 together.

On the other hand, FIG. 1B shows a configuration in which the length L of the channel 113 in the ultraviolet irradiation device 1 is approximately the same as the thickness t of the translucent member 60 (that is, L≈t and D≈0). ing. In such a case, since the depth D of the concave portion 112 is not sufficiently secured, the adhesive member 70 protruding from the concave portion 111 protrudes to a position where it interferes with the interposer 50 . Therefore, when the case portion 10 and the light-transmitting member 60 are pressed, the protruding adhesive member 60 may interfere with the interposed body 50, resulting in defective assembly of the product.

FIG. 6 is a diagram for explaining the relationship between the ultraviolet light emitting element of the ultraviolet irradiation device according to one embodiment of the present invention and the peripheral portion of the opening of the case portion.

In general, the light emitted from the ultraviolet light emitting element 30 (that is, deep ultraviolet light in this example) has the characteristic of being three-dimensionally emitted from its central axis, and the intensity of the light becomes weaker as it deviates from the central axis. The angle obtained by doubling the angle from the central axis when the intensity of emitted light is 1/2 (50%) is called the directivity angle. Therefore, in order to effectively utilize the light emitted from the ultraviolet light emitting element 30, more light must be emitted to the outside from the window portion 11'. Typically, since the directivity angle of the ultraviolet light emitting element 30 is about 135 degrees, a virtual line on a two-dimensional plane connecting the opening peripheral portion 11 with the ultraviolet light emitting element 30 having such directivity as the vertex is formed. If the angle (hereinafter referred to as "aperture angle") θ is equal to or greater than the directivity angle, preferably approximately 150 degrees or greater, light having an intensity of 50% or greater can be obtained. In this example, the aperture angle θ is assumed to be approximately 150 degrees.

On the other hand, in the configuration in which the light-transmitting member 60 is provided facing the ultraviolet light-emitting element 30 to seal and protect the ultraviolet light-emitting element 30 as in the present disclosure, if the light-transmitting member 60 is excessively thick, The amount of UV rays emitted to the In addition, the excessive thickness of the light-transmitting member 60 requires strength of the case portion 10 to which the light-transmitting member 60 is fixed. Also, the distance to the target object becomes longer. Therefore, it is necessary to ensure sufficient strength of the translucent member 60 and allow a sufficient amount of ultraviolet rays to be emitted to the outside.

That is, as shown in the figure, in the ultraviolet irradiation device 1 of this example, the opening peripheral edge portion 11 of the case portion 10 is formed with an inclination so as to become lower, for example, toward the inside (toward the center). The tilt angle is defined by the distance (that is, the radius) on the plane from the ultraviolet light emitting element 30 to the opening peripheral portion 11 and the height to the upper surface of the opening peripheral portion 11, and can also depend on the aperture angle θ. . For example, if the opening angle θ is 150 degrees, the inclination angle of the opening peripheral portion 11 exceeding the imaginary line forming the opening angle θ is 15 degrees. Therefore, an effective amount of ultraviolet light emitted from the ultraviolet light emitting element 30 is emitted to the outside from the window portion 11'.

As described above, according to the present embodiment, it is possible to obtain an ultraviolet irradiation device that is excellent in waterproofness, dripproofness, and dustproofness, and has a structure that does not easily deteriorate even after long-term use. Above all, according to this embodiment, the transparent member 60 is reliably fixed to the opening peripheral edge portion 11 by the adhesive member 70 injected and filled in the first concave portion 111 , so that it is sealed between the substrate 20 and the transparent member 60 . A space is formed, thereby protecting the ultraviolet light emitting element 30 from water droplets, moisture, and dust.

Further, the adhesive member 70 is pressed by pressure bonding between the lower end portion of the opening peripheral portion 11 and the translucent member 60 to fill the first concave portion 111 with no gap, and furthermore, the adhesive member 70 protrudes from the first concave portion 111. A part of the member 70 reaches the second recess 112 through the channel 113 and is cured in this state. Since the gas generated during the heating does not flow into the space, deterioration of the ultraviolet light emitting element 30 can be prevented. In addition, the adhesive member 70 that has flowed into the channel 113 contributes to the adhesion of the light-transmitting member 60, so that the light-transmitting member 60 can be fixed to the case portion 10 more firmly.

In addition, according to the present embodiment, a configuration is adopted in which the peripheral portion of the translucent member 60 is fixed by the adhesive member 70 filled in the first concave portion 111 formed at the lower end portion of the opening peripheral portion 11 . Therefore, the adhesive member 70 is less likely to be exposed to the ultraviolet rays emitted from the ultraviolet light emitting element 30, and thus deterioration of the adhesive member 70 can be prevented.

Furthermore, according to the present embodiment, since the opening peripheral portion 11 is inclined in consideration of the directivity angle of the ultraviolet light emitting elements 30, most of the ultraviolet rays emitted by the ultraviolet light emitting elements 30 are efficient. can be emitted to the outside.

The above embodiments are examples for explaining the present invention, and are not intended to limit the present invention only to these embodiments. The present invention can be embodied in various forms without departing from the gist thereof.

For example, in the methods disclosed herein, steps, operations or functions may be performed in parallel or in a different order so long as the results are not inconsistent. The steps, acts and functions described are provided as examples only and some of the steps, acts and functions may be omitted or combined together without departing from the scope of the invention. one, and other steps, operations, or functions may be added.

In addition, although various embodiments are disclosed in this specification, specific features (technical matters) in one embodiment may be added to other embodiments or Certain features in the embodiments can be substituted and such forms are included in the gist of the invention.

DESCRIPTION OF SYMBOLS 1... Ultraviolet irradiation apparatus 10... Case part 11... Opening peripheral part 11'... Window part 111... 1st recessed part 112... 2nd recessed part 113... Channel 12... Cable interface part 121... Fastener part 13... Fixing part 20... Board DESCRIPTION OF SYMBOLS 30... Ultraviolet light-emitting element 40... Base part 50... Interposition body 60... Translucent member 70... Adhesive member 80... Electric cable

Claims (14)

a substrate having a first side and a second side;
at least one ultraviolet light emitting element provided on the first surface of the substrate and capable of emitting deep ultraviolet light;
a translucent member having translucency, which has a first surface and a second surface, and is provided so that the second surface faces the at least one ultraviolet light emitting element;
a case portion having an opening peripheral portion forming a window portion, the case portion for fixing the translucent member at the opening peripheral portion;
an adhesive member that adheres the translucent member and the opening peripheral portion of the case portion;
the opening peripheral portion includes a first concave portion facing the first surface of the translucent member and for receiving the adhesive member;
One end of the first recess is configured to form a channel having a predetermined gap with the side end surface of the translucent member,
UV irradiation device. the opening rim further includes a second recess that communicates with the first recess through the channel;
The ultraviolet irradiation device according to claim 1. The second recess is formed toward the distal side from the side end surface of the translucent member,
The ultraviolet irradiation device according to claim 2. An intervening body interposed between the substrate and the light-transmitting member supports the light-transmitting member such that the second surface of the light-transmitting member has a predetermined distance from the at least one ultraviolet light emitting element. prepare
The ultraviolet irradiation device according to claim 3. the first surface of the interposer faces the second recess so as to form a predetermined space;
The ultraviolet irradiation device according to claim 4. The size of the peripheral edge formed by the one end portion of the first recess is 105% or less of the size of the peripheral edge formed by the side end surface of the translucent member.
The ultraviolet irradiation device according to any one of claims 1 to 5. the length of the channel along the side end surface of the light-transmitting member is 1/3 to 2/3 of the thickness of the light-transmitting member;
The ultraviolet irradiation device according to claim 1. An aperture angle formed by a virtual line on a two-dimensional plane connecting the opening peripheral portion with the at least one ultraviolet light emitting element as a vertex is equal to or larger than the directivity angle of the at least one ultraviolet light emitting element.
The ultraviolet irradiation device according to claim 1. The size of the opening angle is 150 degrees or more,
The ultraviolet irradiation device according to claim 8. The opening peripheral portion of the case portion is inclined based on the opening angle,
The ultraviolet irradiation device according to claim 8 or 9. The thickness of the translucent member is 5 mm or less,
The ultraviolet irradiation device according to claim 1. The distance between the at least one ultraviolet light emitting element and the second surface of the translucent member is 1 mm or less,
The ultraviolet irradiation device according to any one of claims 1 to 11. a substrate having a first side and a second side;
at least one ultraviolet light emitting element provided on the first surface of the substrate and capable of emitting deep ultraviolet light;
a translucent member having a first surface and a second surface, the second surface being provided so as to face the at least one ultraviolet light emitting element;
a case part that houses the at least one ultraviolet light emitting element and the translucent member;
a bonding member for bonding the translucent member and the case,
the case portion has an opening peripheral edge portion facing the peripheral edge portion of the translucent member and forming a window;
The distance between the first surface of the substrate and the second surface of the light-transmitting member is D1, and the distance between the first surface of the substrate and a portion of the opening periphery that contacts the periphery of the light-transmitting member. D2 is the distance between the first surface of the substrate and a portion of the opening peripheral portion that faces but is not in contact with the peripheral edge portion of the light-transmitting member; D3 is the first surface of the substrate and the opening peripheral portion; When the distance from the portion not facing the peripheral edge of the translucent member in is D4, the relationship between the distances D1 to D4 is as follows:
D1<D4<D2<D3
The filling,
The adhesive member is present continuously on at least a portion of the opening peripheral edge portion and the peripheral edge portion of the translucent member facing each other,
UV irradiation device. A case part attached to a substrate of an ultraviolet light emitting device,
a contact portion including a surface that contacts the substrate;
and an opening peripheral edge formed with a window,
The opening peripheral edge is
an inner circumference defining the window;
a first outer peripheral portion positioned outside the inner peripheral portion;
a second outer peripheral portion located outside the first outer peripheral portion,
The distance between the virtual plane including the surface of the contact portion and the first outer peripheral portion is greater than the distance between the virtual plane and the inner peripheral portion, and the distance between the virtual plane and the second outer peripheral portion is the distance is smaller than the distance between the virtual plane and the inner periphery;
case part.

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