JP7532608B1 - Lighting fixtures - Google Patents

Abstract

[Problem] To provide a lighting fixture capable of preventing foreign matter from entering the light emitting substrate through gaps between lens plates. [Solution] The present invention is directed to a lighting fixture in which a plurality of lens plates 4 are arranged side by side to cover a light emitting substrate 3. Of adjacent lens plates 4, the end of one lens plate 4 facing the other lens plate 4 is formed as a male cover 43a, and the end of the other lens plate 4 facing the one lens plate 4 is formed as a female cover 43b, and the leading edge of the female cover 43b is arranged to overlap the outer leading edge of the male cover 43a [Selected Figure] Fig. 7

Description

This invention relates to lighting fixtures such as LED ceiling lights in which multiple lens plates are mounted in a row on an LED substrate.

The conventional lighting fixture shown in Patent Document 1 below is an LED ceiling light that is attached to the ceiling. This LED ceiling light includes a fixture body that is attached to the ceiling, multiple LED boards that are attached to the fixture body in a line, multiple lens plates that are arranged in a line to cover each LED board, and a lighting cover that is attached to the fixture body in a line to cover the LED boards and lens plates.

Patent No. 6931809

However, in the conventional LED ceiling light described above, because multiple lens plates are arranged side by side, gaps may form between adjacent lens plates. In such cases, there is a problem that small insects or fine dust particles that have infiltrated the lighting cover may pass through the gaps between the lens plates and enter the LED board, causing adverse effects on the LED board, etc.

This invention was made in consideration of the above problems, and aims to provide a lighting fixture that can prevent foreign objects such as insects and dust from entering the light-emitting substrate, such as the LED substrate, through the gaps between the lens plates.

To solve the above problems, the present invention provides the following:

[1] A lighting fixture in which a plurality of lens plates are arranged side by side to cover a light-emitting substrate,
Among the adjacent lens plates, an end portion of one lens plate facing the other lens plate is formed as a male cover, and an end portion of the other lens plate facing the one lens plate is formed as a female cover,
A lighting fixture characterized in that a leading edge of the female side cover is arranged to overlap the outside of a leading edge of the male side cover.

[2] A plurality of the lens plates are joined together in an annular shape,
2. The lighting fixture according to claim 1, wherein the male cover is provided at one opposing end of each lens plate, and the female cover is provided at the other opposing end of each lens plate.

[3] A lighting fixture as described in paragraphs 1 or 2 above, in which a chamfered guide inclined surface is formed on at least one of the outer end edge of the male cover and the inner end edge of the female cover.

[4] A plurality of the light emitting substrates are arranged in a row corresponding to a plurality of the lens plates,
Among the adjacent light emitting boards, a one-side connector is provided at an end of the one-side light emitting board facing the other-side light emitting board, and a other-side connector is provided at an end of the other-side light emitting board facing the one-side light emitting board,
4. The lighting fixture according to any one of claims 1 to 3, wherein the one connector is covered by the male cover and the other connector is covered by the female cover.

[5] The male-side cover has side walls covering both side surfaces of the one-side connector,
the female-side cover has side walls covering both side surfaces of the other-side connector,
5. The lighting fixture according to claim 4, wherein both side walls at the tip edge of the female side cover are arranged to overlap the outsides of both side walls at the tip edge of the male side cover.

[6] The lighting device according to any one of paragraphs 1 to 5 above, in which the male cover and the female cover are integrally formed with the lens plate.

According to the lighting fixture of invention [1], the male cover at the end of one lens plate and the female cover at the end of the other lens plate are arranged so as to overlap each other among the adjacent lens plates, which prevents the formation of gaps between the adjacent lens plates. This prevents foreign objects such as insects and dust from entering the light-emitting substrate, and ensures that the light-emitting substrate is not adversely affected by foreign objects entering the substrate.

The lighting fixture of invention [2] can reliably prevent foreign matter from entering the light-emitting substrate even when multiple lens plates are arranged in a ring shape along the sides of a square or other shape.

According to the lighting fixture of the invention [3], the method of attaching the lens plate can be diversified. That is, in the lighting fixture of the present invention, when the leading edge of the male cover and the leading edge of the female cover are overlapped, the leading edge of the male cover is usually covered from above by the leading edge of the female cover. However, according to the lighting fixture of the invention [3], the leading edges of the male cover and the female cover are formed with a chamfered guide inclined surface, so that it is also possible to overlap by inserting the leading edge of the male cover into the inside of the leading edge of the female cover, and thus it is possible to diversify the method of attaching the lens plate.

According to the lighting fixtures of inventions [4] and [5], the connectors on one side and the other side provided at the opposing ends of adjacent light-emitting boards can be reliably covered by the male cover and the female cover, reliably preventing the connectors from being adversely affected by intruding foreign objects.

In the lighting fixture of invention [6], the male and female covers are formed integrally with the lens plate, making it easy to manufacture these covers.

FIG. 1 is an external perspective view showing an LED ceiling light as a lighting fixture according to an embodiment of the present invention. FIG. 2 is a bottom view showing the ceiling light of the embodiment. FIG. 3 is a perspective view showing a state in which a light source unit is attached to a fixture body in the ceiling light of the embodiment. FIG. 4 is a bottom view showing the light source unit in the ceiling light of the embodiment. FIG. 5 is a bottom view showing an LED board as a light-emitting board in the light source unit of the embodiment. FIG. 6 is an exploded perspective view showing light source unit components that constitute the light source unit of the embodiment. FIG. 7 is a cross-sectional view showing a light source unit according to the embodiment. FIG. 8 is an enlarged cross-sectional view showing a main part of FIG. FIG. 9 is a cross-sectional view for explaining a method of attaching the lens plate. FIG. 10 is a schematic diagram for explaining luminance unevenness in the ceiling light of the embodiment. FIG. 11 is a schematic diagram for explaining luminance unevenness in the ceiling light of the reference example.

Figure 1 is a perspective view showing an LED ceiling light as a lighting fixture according to an embodiment of the present invention, Figure 2 is a bottom view showing the ceiling light according to the embodiment, and Figure 3 is a perspective view showing the light source unit 2 attached to the fixture body 1 of the ceiling light according to the embodiment.

As shown in these figures, the LED ceiling light of this embodiment has as its basic components a fixture body (base) 1 that is attached to the ceiling surface via an adapter (not shown), a light source unit 2 that is attached to the underside of the fixture body 1, and a lighting cover 5 that is attached to the underside of the fixture body 1 and is positioned so as to cover the light source unit 2 from the underside.

The lighting cover 5 is formed in a square shape when viewed from below and has a hollow shape with an opening on the upper side. The light source unit 2 is housed in the hollow portion, and the edge of the opening is removably attached to the fixture body 1.

Figure 4 is a bottom view showing the light source unit 2 of the ceiling light of the embodiment, Figure 5 is a bottom view showing the LED board 31 of the light source unit 2 of the embodiment, Figure 6 is an exploded perspective view showing the light source unit component 20 that constitutes the light source unit 2 of the embodiment, Figure 7 is a cross-sectional view of the light source unit 2, and Figure 8 is an enlarged cross-sectional view showing the main part of Figure 7.

As shown in Figures 1 to 8, the light source unit 2 is formed by four elongated light source unit components 20 each having a substantially rectangular shape. Each light source unit component 20 includes an LED board 3 as a rectangular light-emitting substrate, and a rectangular lens plate 4 corresponding to the LED board 3.

A large number of LEDs (light emitting diodes) 31 are attached to the LED board 3 as light emitting elements. The inner corners at both ends of the LED board 3 are cut at an angle of 45° with respect to the length direction of the LED board 3 to form one-side joining notches 32a and other-side joining notches 32b. Furthermore, each LED board 3 is provided with one-side (male side) connectors 33a and other-side (female side) connectors 33b corresponding to the one-side joining notches 32a and other-side joining notches 32b.

As shown in FIG. 5, the four LED boards 3 are arranged in a frame shape along the sides of the square and are fixed to the fixture body 1 by screws or the like. In this case, the corresponding joining notches 32a, 32b of adjacent LED boards 3 are joined together, so that the adjacent LED boards 3 are arranged at right angles.

The corresponding connectors 33a, 33b of adjacent LED boards 3 are connected to each other by a connector connection cable 35, and the adjacent LED boards 3 are electrically connected. Of the corresponding connectors 33a, 33b, one pair of connectors 33a, 33b (the connectors arranged on the upper side in FIG. 5) are connected to an adapter (not shown) by the connector connection cable 35. In this way, the adapter and each LED board 3 are electrically connected.

As shown in Figures 3 to 8, the lens plate 4 is formed in a rectangular shape corresponding to the rectangular LED board 3, and lenses (lens portions) 41 are provided corresponding to each LED 31 of the LED board 3. Furthermore, at the two inner corners of both ends of the lens plate 4, in other words at the portions corresponding to the one-side connection cutout 32a and the other-side connection cutout 32b of the LED board 3, a male connector cover (male side cover) 43a and a female connector cover (female side cover) 43b that cover the connectors 33a, 33b of the LED board 3 from below are integrally formed. The male and female connector covers 43a, 43b are each provided with side walls 44, 44 that cover both side surfaces of the corresponding connectors 33a, 33b. In this embodiment, the leading edge of the connector covers 43a, 43b includes the leading edge of the side walls 44, 44, and the leading edges of the connector covers 43a, 43b form the opening edges 42a, 42b of the connector covers 43a, 43b. Furthermore, in this embodiment, the opening surface surrounded by the opening edges 42a, 42b of the connector covers 43a, 43 corresponds to the joining notches 32a, 32b of the LED board 3 and is arranged at an angle of 45° to the length direction of the lens plate 4.

The opening edge 42b of the female connector cover 43b is formed to be slightly larger than the opening edge 42a of the male connector cover 43a, and the opening edge 42b of the female connector cover 43b is configured to be fitted (externally fitted) to the outside of the opening edge 42a of the male connector cover 43a.

As shown in FIG. 8, a chamfered guide inclined surface 45a is formed on the outer surface of the opening edge 42a of the male connector cover 43a, inclining inward toward the tip, and a chamfered guide inclined surface 45b is formed on the inner surface of the opening edge 42b of the female connector cover 43b, inclining outward toward the tip.

As shown in FIG. 6, the lens plate 4 is arranged so as to cover each LED board 3 from the bottom side, and is fixed to the fixture body 1 by screws or the like. In this case, as shown in FIG. 7 and FIG. 8, the connector covers 43a and 43b of each lens plate 4 house the corresponding connectors 33a and 33b of the LED board 3. Furthermore, of the corresponding two-side connector covers 43a and 43b of adjacent lens plates 4, the opening edge 42b of the female connector cover 43b is fitted outside the opening edge 43a of the male connector cover 43a, and both opening edges 42a and 42b are arranged in a state where they are closely butted against each other. In this way, the four lens plates 4 are arranged in a frame shape (annular shape) so that adjacent lens plates 4 are arranged at right angles. In other words, the four light source unit components 20 composed of the LED board 3 and the lens plate 4 are arranged so as to be joined in a frame shape (annular shape) along the sides of the square, forming the light source unit 2.

Here, in this embodiment, since the four lens plates 4 are joined in sequence by male-female coupling, there is a risk that the last (fourth) lens plate 4 may not be attached smoothly. For example, after attaching the lens plate 4 at the top left of FIG. 4 as the first lens plate, when attaching the lens plate 2 at the top right of FIG. 4 as the second lens plate, the opening edge 42b of the female connector cover 43b of the second lens plate 4 is fitted from above onto the opening edge 42a of the male connector cover 43a of the first lens plate 4, and the second lens plate 4 is placed and fixed on the corresponding LED board 3. Similarly, when attaching the third lens plate 4 (lower right of FIG. 4), the opening edge 42b of the female connector cover 43b of the third lens plate 4 is fitted from above onto the opening edge 42a of the male connector cover 43a of the second lens plate 4, and the third lens plate 4 is placed and fixed on the corresponding LED board 3. In this way, the first three lens plates 4 can be attached without difficulty, but when attaching the fourth lens plate 4 (lower left in Figure 4) between the first and third lens plates 4 that are already fixed, the opening edge 42b of the female connector cover 43b of the fourth lens plate 4 can be fitted from above onto the opening edge 42a of the male connector cover 43a of the third lens plate 4, but the opening edge 42a of the male connector cover 43a of the fourth lens plate 4 cannot be inserted into the opening edge 42b of the female connector cover 43b of the first lens plate 4 that is already fixed, so there is a risk that the fourth (last) lens plate 4 will not be able to be attached smoothly.

Therefore, in this embodiment, a guide inclined surface 45a is formed on the outside of the opening edge 42a of the male connector cover 43a of the lens plate 4, and a guide inclined surface 45b is formed on the outside of the opening edge 42b of the female connector cover 43b. Therefore, as shown in Figure 9, when attaching the fourth lens plate 4 (lower right of Figure 4) between the first and third lens plates 4 that have already been fixed, first, the opening edge 42a of the male connector cover 43a of the fourth lens plate 4 is inserted diagonally from above and fitted into the opening edge 42b of the female connector cover 43b of the first lens plate 4, and then the opening edge 42b of the female connector cover 43b of the fourth lens plate is fitted from above into the opening edge 42a of the male connector cover 43a of the third lens plate 4. This allows the fourth lens plate 4 to be accurately positioned on the LED substrate 3 between the first and third lens plates 4, and the fourth lens plate 4 can be fixed in place without any strain.

In this embodiment, the opening edges 42a, 42b of the connector covers 43a, 43b on both sides of the lens plate 4 are formed with guide inclined surfaces 45a, 45b. However, in the present invention, if a guide inclined surface is formed on at least one of the opening edges 42a, 42b, the fourth (last) lens plate 4 can be attached without difficulty.

As described above, according to the LED ceiling light of this embodiment, the lens plate 4 is provided with male and female connector covers 43a and 43b that cover the connectors 33a and 33b of the LED board 3, and the opening edge 42b of the female connector cover 43b is fitted over the opening edge 42a of the male connector cover 43a so as to overlap, thereby preventing the formation of a gap between the male and female connector covers 43a and 43b. Therefore, the connectors 33a and 33b of the LED board 3 are securely covered by the connector covers 43a and 43b, and foreign objects such as small insects and fine dust cannot enter the connector covers 43a and 43b, and adverse effects of foreign objects entering the connectors 33a and 33b and the LED board 3 can be prevented.

In particular, in this embodiment, chamfered guide inclined surfaces 45a, 45b are formed on the opening edges 42a, 42b of the male and female connector covers 43a, 43b of the lens plate 4, so that the fourth (last) lens plate 4 can be attached smoothly and effortlessly, as described above.

In the above embodiment, the case where the connector of the LED board 3 is covered by the cover of the lens plate 4 has been described as an example, but this is not limited thereto. In the present invention, the lens plate cover may cover part of the light-emitting board (LED board). In short, any configuration can be adopted as long as the female cover of one lens plate of adjacent lens plates is overlapped on the outside of the male cover of the other lens plate, so that no gap is formed between the lens plates.

In the above embodiment, the present invention has been described as being applied to a lighting fixture in which the lens plate is arranged in a square ring, but the present invention is not limited to this, and can also be applied to lighting fixtures in which the lens plate is arranged in a polygonal ring other than a square, or in a circular or elliptical ring. Furthermore, the present invention can be applied not only to lighting fixtures in which the lens plate is arranged in a regular polygonal ring, but also to lighting fixtures in which the lens plate is arranged in an irregular ring. However, the present invention can be applied not only to lighting fixtures in which the lens plate is arranged in a ring, but also to lighting fixtures in which the lens plates are arranged side by side.

In the above embodiment, the present invention has been described as being applied to an LED ceiling light, but the present invention is not limited to this and can be applied to lighting fixtures other than ceiling lights.

As shown in Figures 2 and 10, in this embodiment, the square frame-shaped light source unit 2 is arranged to rotate 45° around the vertical axis relative to the square lighting cover 5, and each corner of the square light source unit 2, i.e., each opposing end of adjacent light source unit components 20, is arranged to correspond to the middle of each side of the square lighting cover 5. In other words, each side of the square light source unit 2 is arranged to correspond to each corner of the square lighting cover 5. As a result, in the ceiling light of this embodiment, almost the entire square lighting cover 5 can be illuminated with almost uniform brightness without uneven brightness.

That is, in an LED ceiling light having a square lighting cover 5, when the light source unit 2 is formed in a square frame shape as in this embodiment, it is common to arrange each side of the light source unit 2 (each light source unit component 20) parallel to each side of the lighting cover 5 so that the light source unit 2 is arranged corresponding to the lighting cover 5 as shown in FIG. 11. However, as will be described in detail later, when the light source unit 2 is arranged in this manner relative to the lighting cover 5, the brightness in the areas along the sides of the lighting cover 2 is low, and the lighting cover as a whole experiences brightness unevenness, making it impossible to obtain a good sense of brightness.

In contrast, when the corners of the light source unit 2 are arranged to correspond to the middle of each side of the lighting cover 5 as in the present embodiment shown in Figures 2 and 10, the corners of the light source unit 2, i.e., the opposing ends of two adjacent light source unit components 20, are arranged close to the sides of the lighting cover 5, so that the illumination light emitted from the two adjacent light source unit light source plates 20 is sufficiently reflected by the sides of the lighting cover 5, and the periphery of the sides of the lighting cover 5 is evenly illuminated by the reflected light. As a result, almost the entire lighting cover 5 can be illuminated without unevenness in brightness, providing the user with a good sense of brightness.

In fact, the luminance was measured at required positions in the ceiling light of the embodiment shown in Figure 10 and the ceiling light of the reference example shown in Figure 11. Specifically, the luminance was measured at the center position E of the lighting cover 5, the middle position B of the side, the corner position A, the approximately middle position C between the corner position A and the center position E, and the approximately middle position D between the corner position A and the middle position C. For this measurement, a Konica Minolta LS-150 was used as a luminance meter, and the luminance meter was placed 1 m away from the ceiling light (lighting cover 5) in front of it.

10, point A was 1585 cd/ ^m2 , point B was 6220 cd/ ^m2 , point C was 6000 cd/ ^m2 , point D was 5000 cd/ ^m2 , and point E was 6180 cd/ ^m2 . Therefore, points E and C had almost the same luminance, points E and B had almost the same luminance, point D was about 20% darker than point C, and point A was 70% darker than point D. In this way, the luminance was almost the same in almost the entire range except for point A, and a good sense of brightness was obtained.

11, point A was 1565 cd/ ^m2 , point B was 4600 cd/ ^m2 , point C was 5400 cd/ ^m2 , point D was 4400 cd/ ^m2 , and point E was 6000 cd/ ^m2 . Therefore, point C was about 10% darker than point E, point B was about 65% darker than point E, point D was about 20% darker than point C, and point A was 65% darker than point D. Thus, luminance unevenness was observed in many areas, and a good sense of brightness could not be obtained.

The lighting fixture of this invention can be used, for example, as an LED ceiling light that is attached to the ceiling.

3: LED board (light emitting board)
33a, 33b: Connector 4: Lens plate 42a, 42b: Opening edge portion (tip edge)
43a: Male connector cover (male cover)
43b: Female connector cover (female cover)
44: Both side walls 45a, 45b: Guide inclined surfaces

Claims (6)

A lighting fixture in which a plurality of lens plates are arranged side by side to cover a light emitting substrate,
Among the adjacent lens plates, an end portion of one lens plate facing the other lens plate is formed as a male cover, and an end portion of the other lens plate facing the one lens plate is formed as a female cover,
The female cover is disposed so that a leading edge of the female cover overlaps an outer leading edge of the male cover ,
A plurality of the lens plates are joined together in an annular shape,
A lighting fixture, characterized in that the male side cover is provided at one opposing end of each lens plate, and the female side cover is provided at the other opposing end of each lens plate . a plurality of the light emitting substrates are arranged in line corresponding to a plurality of the lens plates;
Among the adjacent light emitting boards, a one-side connector is provided at an end of the one-side light emitting board facing the other-side light emitting board, and a other-side connector is provided at an end of the other-side light emitting board facing the one-side light emitting board,
2. The lighting fixture according to claim 1 , wherein the one connector is covered by the male cover, and the other connector is covered by the female cover. A lighting fixture in which a plurality of lens plates are arranged side by side to cover a light emitting substrate,
Among the adjacent lens plates, an end portion of one lens plate facing the other lens plate is formed as a male cover, and an end portion of the other lens plate facing the one lens plate is formed as a female cover,
The female cover is disposed so that a leading edge of the female cover overlaps an outer leading edge of the male cover,
a plurality of the light emitting substrates are arranged in line corresponding to a plurality of the lens plates;
Among the adjacent light emitting boards, a one-side connector is provided at an end of the one-side light emitting board facing the other-side light emitting board, and a other-side connector is provided at an end of the other-side light emitting board facing the one-side light emitting board,
A lighting fixture, characterized in that the one side connector is covered by the male side cover, and the other side connector is covered by the female side cover. 4. The lighting fixture according to claim 1 , wherein at least one of an outer end edge of the male cover and an inner end edge of the female cover is provided with a chamfered inclined guide surface. the male-side cover has side walls covering both side surfaces of the one-side connector,
the female-side cover has side walls covering both side surfaces of the other-side connector,
4. The lighting fixture according to claim 2 , wherein both side walls at the leading edge of the female cover are arranged to overlap the outsides of both side walls at the leading edge of the male cover. The lighting fixture according to claim 1 , wherein the male cover and the female cover are integrally formed with the lens plate.

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