JP7769971B2 - lighting fixtures - Google Patents

Description

This disclosure relates generally to lighting fixtures. More particularly, this disclosure relates to lighting fixtures that inhibit insect intrusion.

The lighting device described in Patent Document 1 includes a chassis, a translucent cover, and lighting components such as a light source in the space formed by the chassis and the translucent cover. The lighting device also includes a sealing member that seals the area between the chassis and the translucent cover.

International Publication No. 2012/008280

In the lighting device described in Patent Document 1, the joint between the chassis and the translucent cover is sealed, preventing insects from entering the space formed by the chassis and the translucent cover (internal space). However, in such lighting devices, gaps can appear between the joints due to deterioration over time, making it easier for insects to enter the internal space.

This disclosure was made in light of the above reasons, and aims to provide a lighting fixture that makes it difficult for insects to enter the interior space.

A lighting fixture according to one aspect of the present disclosure comprises a mounting plate, a holder, a cover, and a walk-impeding portion. A light source is mounted on the mounting plate. The holder holds the mounting plate. The cover is attached to the holder so as to cover the light source. The walk-impeding portion is provided in at least one of the mounting plate, the holder, and the cover in a path of insects entering an internal space enclosed by the mounting plate and the cover, and prevents the insects from walking. The cover has an opening that penetrates in the thickness direction of the cover. The walk-impeding portion is provided on at least a portion of the outer periphery of the opening.
A lighting fixture according to one aspect of the present disclosure includes a mounting plate, a holder, a cover, and a walking-impeding portion. A light source is attached to the mounting plate. The holder holds the mounting plate. The cover is attached to the holder so as to cover the light source. The walking-impeding portion is provided in at least one of the mounting plate, the holder, and the cover in an entry path for insects into an internal space surrounded by the mounting plate and the cover, and impedes the insects' walking. In a target member among the mounting plate, the holder, and the cover on which the walking-impeding portion is provided, the dynamic friction coefficient of the walking-impeding portion is lower than the dynamic friction coefficient of a second portion other than the first portion on which the walking-impeding portion is provided.

This disclosure has the advantage of providing a lighting fixture that makes it difficult for insects to enter the interior space.

FIG. 1 is a perspective view showing a state in which a lighting fixture according to a first embodiment is installed on a ceiling. FIG. 2 is a cross-sectional view of the lighting fixture. FIG. 3 is a cross-sectional view of area A1 in FIG. FIG. 4 is a cross-sectional view of a walking-impeding portion having an uneven structure, which is one form of the walking-impeding portion provided in the lighting fixture. FIG. 5 is a cross-sectional view of a main part of a lighting fixture according to a modified example of the first embodiment. FIG. 6 is a cross-sectional view of a main part of a lighting fixture according to a modified example of the first embodiment. FIG. 7 is a perspective view showing a state in which the lighting fixture according to the second embodiment is installed on a ceiling. FIG. 8 is a cross-sectional view of a lighting fixture according to the second embodiment. FIG. 9 is a cross-sectional view of area A2 in FIG.

A lighting fixture 1 according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the figures described in the following embodiments are schematic, and the size and thickness ratios of the components in the figures do not necessarily reflect the actual dimensional ratios. Furthermore, the embodiment and variations described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and variations. Even beyond these embodiments and variations, various modifications can be made depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure. Furthermore, the following embodiments (including variations) may be realized in appropriate combinations.

(Embodiment 1)
(1) Overview First, an overview of a lighting fixture 1 according to this embodiment will be described with reference to FIGS. 1 and 2. FIG.

Lighting fixture 1 is, for example, a lighting fixture installed on the ceiling inside a building. Note that lighting fixture 1 may also be a lighting fixture installed on a wall inside a building, or may be a street light or the like installed outdoors.

In the following, as an example, we will explain the case where lighting fixture 1 is a lighting fixture (base light) with a long outer shape that is installed on an indoor ceiling 8, as shown in Figure 1.

As shown in Figures 1 and 2, the lighting fixture 1 comprises a mounting plate 2, a holder 3, a cover 4, and a walking-impeding portion 5. A light source 6 is attached to the mounting plate 2. The holder 3 holds the mounting plate 2. The cover 4 is attached to the holder 3 so as to cover the light source 6. The walking-impeding portion 5 is provided in at least one of the mounting plate 2, holder 3, and cover 4 in the path of insects 7 entering the internal space S1 enclosed by the mounting plate 2 and cover 4, and prevents insects 7 from walking.

With the above configuration, the walking obstruction section 5 obstructs the movement of insects 7 attempting to enter the internal space S1 through the entry path, thereby reducing the probability of insects 7 entering the internal space S1.

(2) Details The lighting device 1 according to the embodiment will be described in detail below.

(2.1) Configuration of the Lighting Device The configuration of the lighting device 1 will be described below with reference to FIGS. 1 to 3.

As shown in Figure 1, the lighting fixture 1 of this embodiment includes a holder 3 that is attached to the ceiling 8 and a light source unit U1 that is detachably attached to the holder 3.

As shown in Figures 1 and 2, the holder 3 is a processed sheet metal product formed by bending a metal plate. The holder 3 is shaped like a flat box extending horizontally. Below, each component of the lighting fixture 1 will be explained by defining the longitudinal direction of the holder 3 as the left-right direction, and the direction perpendicular to both the up-down direction and the longitudinal direction of the holder 3 as the front-to-rear direction.

A recessed groove 31 is formed on the underside of the holder 3, spanning the entire length of the holder 3 in the left-right direction, and the light source unit U1 is housed in the recessed groove 31.

As shown in Figure 2, the light source unit U1 includes a light source module M1, a mounting plate 2, a cover 4, and a walking obstruction portion 5. The light source unit U1 also includes a shielding portion 9.

The light source module M1 includes a light source 6 and a mounting substrate 11.

The light source 6 includes a light-emitting element such as an LED (Light Emitting Diode). Note that the light source 6 is not limited to a configuration using an LED, and may also be configured as an organic electroluminescence element, a discharge lamp, or the like.

The light source 6 is mounted on the mounting substrate 11, for example by soldering, and is electrically connected to the wiring portion provided on the mounting substrate 11.

The mounting board 11 has a long, flat outer shape, and multiple light sources 6 are mounted along the left-right direction. The mounting board 11 electrically connects the multiple light sources 6 in series using wiring. The multiple light sources 6 are arranged in a straight line along the left-right direction of the mounting board 11, at the center of the mounting board 11's short side (the front-to-back direction of the lighting fixture 1).

The mounting substrate 11 includes, for example, a printed wiring board. A resist film is formed on the mounting substrate 11 except for the mounting surface of the light source 6. Note that the mounting substrate 11 is not limited to a printed wiring board, and may include, for example, a ceramic substrate, a metal-based printed wiring board, etc.

The mounting plate 2 is a processed sheet metal product formed, for example, by bending a metal plate. As shown in Figure 2, the mounting plate 2 in this embodiment has a U-shaped cross section.

The mounting plate 2 has a rectangular bottom plate portion 21 whose thickness direction is parallel to the vertical direction and whose longitudinal direction is parallel to the horizontal direction, and a pair of side plate portions 22 that protrude upward from the front and rear ends of the bottom plate portion 21.

A recess 23 is formed on the underside of the bottom plate 21, extending from left to right. The light source module M1 is housed in the recess 23.

A cover 4 that covers the light source module M1 from below is removably attached to the mounting plate 2.

The cover 4 is made of a diffusive material, such as milky white acrylic resin. Light emitted from the multiple light sources 6 of the light source module M1 passes through the cover 4 and is emitted below the cover 4.

A pair of hooks 41 protruding upward are formed on both front-to-rear ends of the cover 4. Each of the pair of hooks 41 is formed over the entire length of the cover 4 in the left-to-right direction.

As shown in Figure 3, each of the pair of hooking portions 41 has a vertical portion 42 and a hook portion 43. Here, Figure 3 is an enlarged cross-sectional view of area A1 in Figure 2.

The vertical portion 42 is a portion that protrudes vertically upward. Note that "vertical" here does not refer only to a strictly vertical state, but also includes a nearly vertical state with an error of a few degrees.

The vertical portion 42 has, for example, multiple circular openings 44. The openings 44 penetrate the vertical portion 42 in the thickness direction.

The multiple openings 44 are spaced apart in the left-right direction of the cover 4.

Some of the multiple openings 44 are fitted with fixtures (not shown) for attaching the light source unit U1 to the holder 3. Note that the opening 44 shown in Figure 3 does not have a fixture installed and is in an open state.

The vertical portion 42 has an installation surface 45 that forms an angle with the horizontal plane that is greater than 0° and less than 180°. Here, it is preferable that the angle that the installation surface 45 forms with the horizontal plane be 45° or greater and 135° or less. Note that the "horizontal plane" referred to here is a plane that is parallel to the vertical direction, that is, a plane that forms an angle of 90° with the vertical direction, but the angle with the vertical direction may deviate by a few degrees from 90°. In this embodiment, the vertical portion 42 protrudes vertically upward, and the installation surface 45 is also perpendicular to the horizontal plane.

The hook portions 43 are hook-shaped portions that are provided above and contiguous with the vertical portion 42. The cover 4 is attached to the mounting plate 2 by hooking the hook portions 43 of the pair of latching portions 41 onto the pair of side plate portions 22 of the mounting plate 2, respectively.

The walking obstruction portion 5 is provided on at least one of the mounting plate 2, the holder 3, and the cover 4. In this embodiment, the walking obstruction portion 5 is provided on the cover 4, for example. In detail, the walking obstruction portion 5 is provided on the installation surface 45 as shown in Figure 3.

The walking obstruction portion 5 is a member that obstructs the movement of insects 7 that attempt to enter the internal space S1 surrounded by the mounting plate 2 and the cover 4. The mechanism by which the walking obstruction portion 5 obstructs the movement of insects 7 is explained in detail in "(2.2) Mechanism by which the walking obstruction portion obstructs insect movement."

As an example, the walking-impeding portion 5 is formed by applying paint to the installation surface 45.

Here, the coefficient of dynamic friction of the walking obstruction portion 5 at the hook portion 41 of the cover 4 is lower than the coefficient of dynamic friction of the portion other than the installation surface 45 on which the walking obstruction portion 5 is provided.

Table 1 shows the results of a comparison of the dynamic friction coefficients of simulated walking obstructions formed by applying multiple types of paint (paint A and paint B) to a flat plate (made of polycarbonate resin) that resembles the installation surface 45, with the dynamic friction coefficient of the flat plate when no simulated walking obstructions are formed.

Here, Paint A is a wet-type paint containing a fluid material such as lubricant, grease, or compound that is fluid at least within the operating temperature range of the lighting fixture 1. In other words, the walking obstruction portion 5 formed by applying Paint A contains a fluid material that is fluid at least within the operating temperature range of the lighting fixture 1. The "operating temperature range" here refers to the temperature range that the walking obstruction portion 5 can be in when the lighting fixture 1 is turned on within its rated power range. It is desirable that the fluid material be fluid even at room temperature (e.g., 5°C to 35°C). This allows the walking obstruction portion 5 to obstruct the path of insects 7 even when the lighting fixture 1 is not turned on. Furthermore, the walking obstruction portion 5 formed by applying Paint A has the advantage that if part of the walking obstruction portion 5 peels off due to insects 7 walking on it, the fluid material flows into the peeled portion, maintaining its effectiveness in obstructing insects 7.

Paint B is a dry-type paint that does not contain any fluidity. In other words, the walk-impeding portion 5 formed by applying Paint B does not have fluidity, at least within the operating temperature range of the lighting fixture 1.

As shown in Table 1, the dynamic friction coefficients of both the simulated walking obstruction area formed by applying paint A and the simulated walking obstruction area formed by applying paint B were smaller than the dynamic friction coefficient of a flat plate without a simulated walking obstruction area. In other words, it is more difficult for insects 7 to move by walking on the walking obstruction area 5 provided on the installation surface 45 than on areas of the hook portion 41 other than the installation surface 45.

Furthermore, as shown in Figure 4, the walking obstruction portion 5 may have an uneven structure with multiple protrusions 12 formed thereon. A walking obstruction portion 5 with an uneven structure is realized by attaching an uneven film sheet made of a resin such as acrylic resin or polycarbonate to the installation surface 45. Here, it is preferable that the shortest distance L1 between two adjacent protrusions 12 among the multiple protrusions 12 is 200 nm or less. The uneven structure may also be realized by applying paint containing fine particles to the area of the lighting fixture 1 where the walking obstruction portion 5 is to be provided.

As shown in Figure 3, the cover 4 has an internal protrusion 46 that protrudes inward (toward the light source 6 in Figure 2) from the surface of the hook portion 41 opposite the installation surface 45. The internal protrusion 46 is formed, for example, over the entire length of the cover 4 in the left-right direction, and is clamped by cover ends 14 (see Figure 1) attached to the left and right ends of the cover 4.

The cover 4 further has a receiving portion 47 that catches insects 7 that fall from the walking-impeding portion 5.

The receiving portion 47 is provided continuous with the lower end of the hooking portion 41. More specifically, the receiving portion 47 has a base 48 provided continuous with the lower end of the hooking portion 41 below the walking obstruction portion 5, and an extension portion 49 extending diagonally upward from the base 48. Therefore, as shown in Figure 3, the base 48 and a portion of the extension portion 49 continuous with the base 48 are provided below the walking obstruction portion 5.

The extension portion 49 has an upper surface 491 and a lower surface 492 that face each other in the thickness direction.

The upper surface 491 is a surface that is continuous with the installation surface 45 of the hook 41. When an insect 7 is prevented from walking by the walk-hindrance portion 5 installed on the installation surface 45 and falls from the walk-hindrance portion 5, it hits the upper surface 491.

The underside 492 is covered by a shielding portion 9. Here, the shielding portion 9 is made of a material with low transparency, such as a metal plate. As a result, the shielding portion 9 visually shields the receiving portion 47 from outside the lighting fixture 1. Note that "visually shielding" here does not only mean making it completely invisible from the outside, but also includes making it difficult to see from the outside.

(2.2) Mechanism of Insect Walking Impeded by Walk-Hindering Unit The mechanism of insect walking impeded by the walk-hindrance unit 5 of the lighting fixture 1 will be described below with reference to Fig. 3. Here, it is assumed that the insect 7 is a small flying insect such as a fly or a mosquito.

Insects 7 in the external space S4 are attracted to lighting fixture 1 by the light emitted from lighting fixture 1.

Insects 7 attracted to the lighting fixture 1 attempt to enter the internal space S1 enclosed by the mounting plate 2 and cover 4 via an entry path that includes space S2, the surface facing space S2, space S3, and the surface facing space S3. Space S2 is the space between the holder 3 and the cover 4, and includes the space from the external space S4 to the opening 44. Specifically, space S2 is the space facing the holder 3, the receiving portion 47, and the hooking portion 41. Space S2 includes the gap C1 between the tip of the extension portion 49 of the receiving portion 47 and the holder 3. Space S3 is the space between the mounting plate 2 and the cover 4, and includes the space from the opening 44 to the internal space S1. Specifically, space S3 is the space facing the bottom plate portion 21, the side plate portion 22, the hooking portion 41, and the internal protrusion 46. Space S3 includes the gap C2 between the bottom plate portion 21 and the internal protrusion 46.

External space S4 and space S2 are connected via gap C1. Space S2 and space S3 are connected via opening 44. Space S3 and internal space S1 are connected via gap C2. This allows heat generated by the light source 6 in internal space S1 to be released into external space S4 through gap C2, opening 44, and gap C1, preventing the temperature of internal space S1 from rising excessively.

Furthermore, by providing a gap C1 between the receiving portion 47 and the holder 3, it is possible to reduce the generation of abnormal noise when the lighting fixture 1 is turned on and off, which is caused by the difference in thermal expansion coefficient between the receiving portion 47 and the holder 3.

For example, insect 7 enters space S2 from external space S4 through gap C1. Once insect 7 has entered space S2, it searches for a path to approach internal space S1. That is, insect 7 searches for opening 44 in space S2. Here, since insects 7 are small flying insects and have a low ability to grasp the relative positions of objects, it is unlikely that insect 7 will fly in space S2 and move directly through opening 44 to space S3. That is, insect 7 is likely to fly or walk along cover 4 or holder 3 and search for opening 44 that leads to space S3.

At this time, in order for the insect 7 to reach the opening 44, it needs to walk along the outer periphery 441 of the opening 44, which is part of the installation surface 45. In this embodiment, the walking obstruction portion 5 is provided over the entire surface of the installation surface 45. In other words, the walking obstruction portion 5 is provided around the entire periphery of the outer periphery 441 of the opening 44. This reduces the possibility of the insect 7 reaching the opening 44. The walking obstruction portion 5 may also be provided on part of the outer periphery 441.

Now, consider the case where, for example, insect 7 passes through gap C1, walks along the upper surface 491 of receiving portion 47, and reaches the lower end of hanging portion 41. Having reached the lower end of hanging portion 41, insect 7 begins to walk upward, for example, on installation surface 45. At this time, because the installation surface 45 is provided with a walking-impeding portion 5, including the outer peripheral edge 441, there is a high possibility that insect 7 will fall onto the repellent portion 10 provided on the upper surface 491 of receiving portion 47 before reaching opening 44. Here, the vertical width of installation surface 45 is preferably 1 mm or more, which is longer than the body length of an insect 7 that can pass through gap C1. This reduces the possibility that insect 7 will step over the walking-impeding portion 5 and reach opening 44.

If an insect 7 dies in the receiving portion 47, the dead insect 7 will remain in the receiving portion 47. However, because the receiving portion 47 is visually shielded from the outside of the lighting fixture 1 by the shielding portion 9, the dead insect 7 will not detract from the aesthetic appearance of the lighting fixture 1.

Table 2 shows the results of an experiment comparing the number of insects 7 that invade the interior space S1 from the exterior space S4 when multiple types of walking impediments 5 (walking impediments A-C) are provided on the installation surface 45 of a lighting fixture 1 and when no walking impediments 5 are provided. The experiment was conducted in the same outdoor location and at the same time of day, with lighting fixtures 1 with walking impediments A-C and lighting fixtures 1 without walking impediments 5 left on. Table 2 also lists the intrusion ratio, which is the ratio of the number of insects 7 that invade the interior space S1 to the number of insects 7 that invade the interior space S1 when no walking impediments 5 are provided.

Walking obstruction portion A is a walking obstruction portion 5 formed by applying the wet-type paint A described in "(2.1) Configuration of the lighting fixture." Walking obstruction portion B is a walking obstruction portion 5 formed by applying the dry-type paint B. Walking obstruction portion C is a walking obstruction portion 5 having an uneven structure with multiple protrusions 12 (see Figure 4) formed therein.

As shown in Table 2, when walk-impeding sections A to C were provided on the installation surface 45, the number of insects 7 entering the internal space S1 was reduced compared to when walk-impeding sections 5 were not provided. In this way, it was confirmed that with the lighting fixture 1 of this embodiment, providing walk-impeding sections 5 reduces the probability of insects 7 entering the internal space S1.

(3) Modifications The following are modifications of the first embodiment. The following modifications can be applied in appropriate combination.

The walking-impeding portion 5 may be further provided on the holder 3. As an example, as shown in FIG. 5, the walking-impeding portion 5 may be further provided on the inner surface 32 of the holder 3.

The walking-impeding portion 5 may also be provided on the mounting plate 2. As an example, as shown in FIG. 6, the walking-impeding portion 5 may also be provided on the outer surface 24 of the side plate portion 22 of the mounting plate 2 facing the space S3.

A walking-impeding portion 5 may also be provided on the upper surface 491 of the receiving portion 47.

The receiving portion 47 may be configured separately from the cover 4.

(Embodiment 2)
As shown in FIG. 7, the lighting fixture 1 according to this embodiment is a lighting fixture (ceiling light) having a circular outer shape and installed on an indoor ceiling 8.

In the following, components similar to those in embodiment 1 will be assigned the same reference numerals and descriptions thereof will be omitted where appropriate. Furthermore, the vertical direction will be described as the up-down direction when the lighting fixture 1 is installed on the ceiling 8.

As shown in Figure 8, the lighting fixture 1 of this embodiment comprises a mounting plate 20, a holder 30, a cover 40, a walking-impeding portion 5, and a shielding portion 90.

The mounting plate 20 is an annular plate with an opening in the center, and multiple light sources 6 are mounted on its circumference.

The mounting plate 20 may include, for example, a printed wiring board. Note that the mounting plate 20 is not limited to a printed wiring board and may include, for example, a ceramic substrate, a metal-based printed wiring board, etc.

The holder 30 is a sheet metal product formed, for example, by bending a metal plate. As shown in Figures 8 and 9, the holder 30 has a disk-shaped holding portion 301 and a protruding portion 302 that protrudes downward from the outer periphery of the holding portion 301.

The holding portion 301 holds the mounting plate 20 on its underside.

The cover 40 is made of a diffusive material, such as milky white acrylic resin.

The cover 40 is formed in a flat dome shape with an open top. The holder 301 is provided with multiple mounting fixtures (not shown) that hold the cover 40. The cover 40 is removably attached to the holder 30 via the multiple mounting fixtures.

As shown in Figure 9, the cover 40 has a dome portion 401 that diffuses light from the light source 6 and emits it downward, an annular receiving portion 402 that covers the top of the dome portion 401, a wall portion 403 that protrudes upward from the inner periphery of the receiving portion 402, and an annular portion 404 that protrudes outward from the upper end of the wall portion 403. Here, Figure 9 is an enlarged cross-sectional view of area A2 in Figure 8.

The shielding portion 90 is provided on the underside of the receiving portion 402 inside the cover 40. The shielding portion 90 is made of a material with low transparency, such as a metal plate. As a result, the shielding portion 90 visually shields the receiving portion 402 from the outside of the lighting fixture 1.

The walking-impeding portion 5 is a member for impeding the movement of insects 7 attempting to enter the internal space S1 facing the mounting plate 20, the holder 30, and the cover 40. Here, the insects 7 enter the internal space S1 via an entry path that includes, for example, the gap C3 between the opposing underside 303 of the holder 301 and the upper surface 405 of the annular portion 404, and the gap C4 between the opposing inner surface 304 of the protrusion 302 and the outer surface 406 of the annular portion 404. Therefore, the walking-impeding portion 5 is provided on the underside 303 of the holder 301, the upper surface 405 of the annular portion 404, the inner surface 304 of the protrusion 302, and the outer surface 406 of the annular portion 404. It is preferable that the gaps C3 and C4 be equal to or greater than 0.6 mm, which is the average body width of insects 7, which are small flying insects. This reduces the possibility that the insect 7 will use both the lower surface 303 and the upper surface 405 for support as it walks, and also reduces the possibility that it will use both the inner surface 304 and the outer surface 406 for support as it walks. It is further preferable that the gaps C3 and C4 be 15 mm or less.

The mechanism by which the walking-hindrance section 5 provided in the lighting fixture 1 obstructs the movement of insects 7 will be described below with reference to Figure 9. As in embodiment 1, the insects 7 are assumed to be small flying insects such as flies or mosquitoes.

Insects 7 in the external space S4 are attracted to lighting fixture 1 by the light emitted from lighting fixture 1.

Insects 7 attracted to lighting fixture 1 attempt to enter interior space S1 via an entry route that includes gaps C3 and C4.

An insect 7 attempting to enter the internal space S1 will likely come into contact with at least one of the lower surface 303, upper surface 405, inner surface 304, and outer surface 406 as it moves toward the internal space S1.

For example, if an insect 7 flies and comes into contact with the walking-impeding portion 5 provided on the inner surface 304, and begins walking upward on the inner surface 304, the walking-impeding portion 5 provided on the inner surface 304 will hinder the insect 7's movement, and there is a high possibility that the insect 7 will fall into the receiving portion 402.

If the insect 7 dies in the receiving portion 402, the dead insect 7 will remain in the receiving portion 402. However, since the receiving portion 402 is visually shielded from the outside of the lighting fixture 1 by the shielding portion 90, the dead insect 7 will not detract from the aesthetic appearance of the lighting fixture 1.

Furthermore, for example, if an insect 7 flies and comes into contact with a walking obstruction portion 5 provided on the upper surface 405, and begins walking on the upper surface 405 toward the internal space S1, the walking obstruction portion 5 provided on the upper surface 405 will obstruct the insect 7's movement, making it difficult for the insect 7 to reach the internal space S1.

If the insect 7 dies at the walking-impeding portion 5 provided on the upper surface 405, the dead insect 7 will remain on the upper surface 405. However, since the upper surface 405 is indirectly visually shielded from the outside of the lighting fixture 1 by the shielding portion 90 that shields the receiving portion 402, the dead insect 7 will not detract from the aesthetic appearance of the lighting fixture 1.

(summary)
As described above, the lighting fixture (1) according to the first aspect includes a mounting plate (2), a holder (3), a cover (4), and a walk-impeding portion (5). A light source (6) is attached to the mounting plate (2). The holder (3) holds the mounting plate (2). The cover (4) is attached to the holder (3) so as to cover the light source (6). The walk-impeding portion (5) is provided in at least one of the mounting plate (2), the holder (3), and the cover (4) in an entry path of insects (7) into the internal space (S1) surrounded by the mounting plate (2) and the cover (4), and impedes the insects' (7) movement.

This embodiment prevents insects (7) from moving, thereby reducing the probability of insects (7) entering the interior space (S1).

The lighting fixture (1) according to the second aspect is the same as the lighting fixture (1) according to the first aspect, but has a gap (C1) between the holder (3) and the cover (4). The entry path includes at least a portion of the gap (C1).

According to this aspect, heat generated in the internal space (S1) is dissipated to the external space (S4) through the gap (C1), thereby preventing the temperature in the internal space (S1) from rising and preventing insects (7) from entering through the gap (C1).

In the lighting fixture (1) according to the third aspect, in the first or second aspect, the walking-impeding portion (5) includes paint applied to at least one of the mounting plate (2), the holder (3), and the cover (4).

This aspect makes it easier to form the walking-impeding portion (5).

In the lighting fixture (1) according to the fourth aspect, in any one of the first to third aspects, at least one of the mounting plate (2), holder (3), and cover (4) has an installation surface (45). The installation surface (45) forms an angle with the horizontal plane that is greater than 0° and less than 180°. The walking-impeding portion (5) is provided on the installation surface (45).

This aspect increases the probability that insects (7) will fall downward from the walking-impeding portion (5) provided on the installation surface (45).

The lighting fixture (1) according to the fifth aspect is the fourth aspect, wherein the angle that the installation surface (45) forms with respect to the horizontal plane is 45° or more and 135° or less.

This aspect increases the probability that insects (7) will fall downward from the walking-impeding portion (5) provided on the installation surface (45).

In the lighting fixture (1) according to the sixth aspect, in any of the first to fifth aspects, the cover (4) has an opening (44) that penetrates the cover (4) in the thickness direction. The walking-impeding portion (5) is provided on at least a portion of the outer peripheral edge (441) of the opening (44).

This embodiment reduces the possibility of insects (7) reaching the opening (44).

In the lighting fixture (1) according to the seventh aspect, in any of the first to sixth aspects, the coefficient of dynamic friction of the walking-impeding portion (5) is lower than the coefficient of dynamic friction of the second portion other than the first portion where the walking-impeding portion (5) is provided, in the target component among the mounting plate (2), the holder (3), and the cover (4).

According to this aspect, the insect (7) can be prevented from walking by sliding on the walking-impeding portion (5).

In the lighting fixture (1) according to the eighth aspect, in any of the first to seventh aspects, the walking-impeding portion (5) includes a fluid material that is fluid at least within the operating temperature range of the lighting fixture (1).

According to this aspect, if a portion of the walking-impeding portion (5) peels off due to the insect (7) walking on it, the fluid material flows into the peeled portion, thereby maintaining the walking-impeding portion (5)'s effect of impeding the walking of the insect (7).

In the lighting fixture (1) according to the ninth aspect, in any one of the first to eighth aspects, the walking-impeding portion (5) has an uneven structure in which a plurality of convex portions (12) are formed. The shortest distance between two adjacent convex portions (12) among the plurality of convex portions (12) is 200 nm or less.

According to this aspect, the insect (7) can be prevented from walking by sliding on the walking-impeding portion (5).

In the lighting fixture (1) according to the tenth aspect, in any one of the first to ninth aspects, the width of the portion on the approach path where the walking-impeding portion (5) is provided is 1 mm or more.

This embodiment reduces the possibility that insects (7) will step over the walking obstruction portion (5) on their entry path.

The lighting fixture (1) according to the eleventh aspect is any one of the first to tenth aspects, and further includes a receiving portion (47) for receiving insects (7) that fall from the walking-impeding portion (5). At least a portion of the receiving portion (47) is provided below the walking-impeding portion (5).

This configuration reduces the possibility of insects (7) falling from the walking-impeding portion (5) falling into the external space (S4).

The lighting fixture (1) according to the twelfth aspect is the eleventh aspect, further comprising a shielding portion (9) that visually shields the receiving portion (47) from outside the lighting fixture (1).

This configuration reduces the possibility that insects (7) caught in the receiving portion (47) will spoil the aesthetic appearance of the lighting fixture (1).

In the lighting fixture (1) according to the thirteenth aspect, in any of the first to twelfth aspects, the entry path includes a gap between two opposing surfaces. A walking-impeding portion (5) is provided on at least one of the two opposing surfaces. The distance between the two opposing surfaces is 0.6 mm or more.

This embodiment reduces the possibility that the insect (7) will use both surfaces for support while walking.

Note that aspects 2 to 13 are not essential components of the lighting device (1) and may be omitted as appropriate.

REFERENCE SIGNS LIST 1 Lighting fixture 2 Mounting plate 3 Holder 4 Cover 5 Walk-hindrance portion 6 Light source 7 Insect 12 Convex portion 44 Opening 45 Installation surface 47 Receiving portion 441 Outer peripheral edge portion C1 Gap S1 Internal space S4 External space

Claims (12)

a mounting plate on which the light source is mounted;
a holder for holding the mounting plate;
a cover attached to the holder so as to cover the light source;
a walk-blocking portion provided in at least one of the mounting plate, the holder, and the cover on a path of insects entering an internal space surrounded by the mounting plate and the cover, the walk-blocking portion blocking the insects' movement ;
the cover has an opening penetrating through the cover in a thickness direction,
The walking-impeding portion is provided on at least a part of the outer peripheral edge of the opening.
Lighting fixtures. a mounting plate on which the light source is mounted;
a holder for holding the mounting plate;
a cover attached to the holder so as to cover the light source;
a walk-blocking portion provided in at least one of the mounting plate, the holder, and the cover on a path of insects entering an internal space surrounded by the mounting plate and the cover, the walk-blocking portion blocking the insects' movement;
In a target member on which the walking-impeding portion is provided among the mounting plate, the holder, and the cover, the dynamic friction coefficient of the walking-impeding portion is lower than the dynamic friction coefficient of a second portion other than the first portion on which the walking-impeding portion is provided.
Lighting fixtures. A gap is provided between the holder and the cover, and the entry path includes at least a part of the gap.
3. A lighting fixture according to claim 1 or 2. The walking-impeding portion includes paint applied to at least one of the mounting plate, the holder, and the cover.
The lighting fixture according to any one of claims 1 to 3. At least one of the mounting plate, the holder, and the cover has an installation surface that forms an angle with respect to a horizontal plane that is greater than 0° and less than 180°;
The walking-impeding portion is provided on the installation surface.
The lighting fixture according to any one of claims 1 to 4. The angle that the installation surface forms with respect to the horizontal plane is 45° or more and 135° or less.
6. A lighting fixture according to claim 5. The walking-impeding portion includes a fluid material that has fluidity at least in the operating temperature range of the lighting fixture.
The lighting fixture according to any one of claims 1 to 6. The walking-impeding portion has an uneven structure in which a plurality of convex portions are formed,
The shortest distance between two adjacent convex portions among the plurality of convex portions is 200 nm or less.
The lighting fixture according to any one of claims 1 to 7. The width of the portion on the approach path where the walking obstruction portion is provided is 1 mm or more.
A lighting fixture according to any one of claims 1 to 8. The device further includes a receiving portion for receiving the insects that fall from the walking-inhibiting portion,
At least a portion of the receiving portion is provided below the walking obstruction portion.
The lighting fixture according to any one of claims 1 to 9. The lighting fixture further includes a shielding portion that visually shields the receiving portion from the outside of the lighting fixture.
11. A lighting fixture according to claim 10. the entry path includes a gap between two opposing surfaces;
The walking-impeding portion is provided on at least one of the two opposing surfaces,
The distance between the two opposing surfaces is 0.6 mm or more.
A lighting fixture according to any one of claims 1 to 11.