Lighting fixture

Abstract

To provide a lighting fixture capable of preventing foreign matter from entering a light-emitting substrate side from a gap 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. Among adjacent lens plates 4, an end part of one side lens plate 4 facing the other side lens plate 4 is formed as a male side cover 43a; an end part of the other side lens plate 4 facing the one side lens plate 4 is formed as a female side cover 43b; and a leading edge of the female side cover 43b is arranged so as to overlap the outside of a leading edge of the male side cover 43a.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a lighting fixture such as an LED ceiling light in which a plurality of lens plates are attached in a row on an LED substrate. [Background technology]

[0002] The conventional lighting fixture shown in Patent Document 1 below is an LED ceiling light that is attached to a 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6931809 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional LED ceiling light, since multiple lens plates are arranged side by side, gaps may be formed between adjacent lens plates. In such cases, there is a problem that small insects or fine dust particles that have invaded the inside of 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.

[0005] This invention has been made in consideration of the above-mentioned 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 an LED substrate through the gaps between the lens plates. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention comprises the following means.

[0007] [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.

[0008] [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.

[0009] [3] A lighting fixture as described in paragraph 1 or 2 above, wherein a chamfered inclined guide 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.

[0010] [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.

[0011] [5] The male cover has side walls covering both sides of the one 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.

[0012] [6] The lighting fixture according to any one of claims 1 to 5, wherein the male side cover and the female side cover are integrally formed with the lens plate. Effect of the Invention

[0013] According to the lighting fixture of the 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 to overlap each other, 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 reliably prevents the light-emitting substrate from being adversely affected by foreign objects entering the substrate.

[0014] According to the lighting device of the invention [2], even when multiple lens plates are arranged in a ring shape along the sides of a square or the like, it is possible to reliably prevent foreign matter from entering the light-emitting substrate.

[0015] 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 by the leading edge of the female cover from above, but 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 the leading edge of the male cover can be inserted into the leading edge of the female cover when overlapping, and the method of attaching the lens plate can be diversified.

[0016] According to the lighting fixtures of the inventions [4] [5], the connectors on one side and the other side provided at the opposing ends of adjacent light-emitting boards, respectively, can be securely covered by a male side cover and a female side cover, thereby reliably preventing the connectors from being adversely affected by foreign objects that may enter the connectors.

[0017] According to the lighting fixture of the invention [6], the male cover and the female cover are formed integrally with the lens plate, so that these covers can be easily manufactured. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is an external perspective view showing an LED ceiling light as a lighting fixture according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a bottom view showing the ceiling light of the embodiment. [Diagram 3] 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. [Figure 4] FIG. 4 is a bottom view showing the light source unit in the ceiling light of the embodiment. [Diagram 5] FIG. 5 is a bottom view showing an LED board as a light-emitting board in the light source unit of the embodiment. [Figure 6] FIG. 6 is an exploded perspective view showing light source unit components that configure the light source unit of the embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a light source unit according to an embodiment. [Figure 8] FIG. 8 is an enlarged cross-sectional view showing a main part of FIG. [Figure 9] FIG. 9 is a cross-sectional view for explaining a method of attaching the lens plate. [Figure 10] FIG. 10 is a schematic diagram for explaining luminance unevenness in the ceiling light of the embodiment. [Figure 11] FIG. 11 is a schematic diagram for explaining luminance unevenness in the ceiling light of the reference example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] FIG. 1 is a 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, and FIG. 3 is a perspective view showing a light source unit 2 attached to a fixture body 1 in the ceiling light of the embodiment.

[0020] As shown in these figures, the LED ceiling light of this embodiment comprises, as its basic components, a fixture body (base) 1 which is attached to the ceiling surface via an adapter (not shown), a light source unit 2 which is attached to the underside of the fixture body 1, and a lighting cover 5 which 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.

[0021] 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. With the light source unit 2 housed within the hollow portion, the opening edge portion is removably attached to the fixture body 1.

[0022] 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 of 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 a cross-sectional view showing an enlarged view of the main parts of Figure 7.

[0023] 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 substrate 3 as a rectangular light-emitting substrate, and a rectangular lens plate 4 corresponding to the LED substrate 3.

[0024] A large number of LEDs (light emitting diodes) 31 are attached to the LED substrate 3 as light emitting elements. The inner corners of both ends of the LED substrate 3 are cut at an angle of 45° with respect to the longitudinal direction of the LED substrate 3 to form one-side joining notch 32a and other-side joining notch 32b. Furthermore, each LED substrate 3 is provided with a one-side (male side) connector 33a and other-side (female side) connector 33b corresponding to the one-side joining notch 32a and other-side joining notch 32b.

[0025] 5, the four LED boards 3 are arranged in a frame shape along the sides of the square and fixed to the fixture body 1 by screws or the like. In this case, the corresponding joining cutouts 32a, 32b of adjacent LED boards 3 are joined together, so that the adjacent LED boards 3 are arranged at right angles.

[0026] Corresponding connectors 33a, 33b of adjacent LED boards 3 are connected to each other by a connector connection cable 35, and adjacent LED boards 3 are electrically connected. Among the corresponding connectors 33a, 33b, one pair of connectors 33a, 33b (connectors arranged on the upper side of FIG. 5) are connected to an adapter (not shown) by the connector connection cable 35. In this manner, the adapter and each LED board 3 are electrically connected.

[0027] 3 to 8, the lens plate 4 is formed in a rectangular shape corresponding to the rectangular LED substrate 3, and lenses (lens portions) 41 are provided corresponding to the LEDs 31 of the LED substrate 3. Furthermore, at two inner corners of both ends of the lens plate 4, in other words at the portions corresponding to the one-side connection cutout portion 32a and the other-side connection cutout portion 32b of the LED substrate 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 substrate 3 from below are integrally formed. The male and female connector covers 43a, 43b are provided with side walls 44, 44 that cover both side surfaces of the corresponding connectors 33a, 33b, respectively. In this embodiment, the leading edges of the both-side connector covers 43a, 43b include the leading edges of the both-side walls 44, 44, and the leading edges of the both-side connector covers 43a, 43b form the opening edges 42a, 42b of the both-side connector covers 43a, 43b. Furthermore, in this embodiment, the opening surfaces surrounded by the opening edges 42a, 42b of the both-side connector covers 43a, 43 correspond to the joining cutouts 32a, 32b of the LED substrate 3 and are arranged at an angle of 45° with respect to the longitudinal direction of the lens plate 4.

[0028] The opening edge portion 42b of the female side connector cover 43b is formed to be slightly larger than the opening edge portion 42a of the male side connector cover 43a, and is configured so that the opening edge portion 42b of the female side connector cover 43b can be fitted (externally fitted) onto the outside of the opening edge portion 42a of the male side connector cover 43a.

[0029] As shown in FIG. 8, a chamfered guide inclined surface 45a that slopes inward toward the tip is formed on the outer surface of the opening edge 42a of the male connector cover 43a, and a chamfered guide inclined surface 45b that slopes outward toward the tip is formed on the inner surface of the opening edge 42b of the female connector cover 43b.

[0030] As shown in FIG. 6 and the like, the lens plate 4 is disposed so as to cover each LED board 3 from the lower side, and is fixed to the fixture body 1 by screw fastening 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 accommodate the corresponding connectors 33a and 33b of the LED board 3. Furthermore, among the corresponding two-side connector covers 43a and 43b of the adjacent lens plates 4, the opening edge portion 42b of the female side connector cover 43b is fitted on the outside of the opening edge portion 43a of the male side connector cover 43a, and the opening edges 42a and 42b are closely butted against each other. In this way, the four lens plates 4 are arranged in a frame shape (annular shape) so that the adjacent lens plates 4 are arranged at right angles. In other words, the four light source unit components 20 constituted by the LED boards 3 and the lens plates 4 are arranged so as to be joined in a frame shape (annular shape) along the sides of a square, forming the light source unit 2.

[0031] Here, in this embodiment, since four lens plates 4 are joined together in sequence by male-female coupling, there is a risk that the last (fourth) lens plate 4 cannot be attached smoothly. For example, when the lens plate 4 at the top left of FIG. 4 is attached as the first lens plate, and then the lens plate 2 at the top right of FIG. 4 is attached 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 the third lens plate 4 (lower right of FIG. 4) is attached, 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 any difficulty, but when attaching the fourth lens plate 4 (bottom left in Figure 4) between the first and third lens plates 4 that are already fixed, although the opening edge 42b of the female connector cover 43b of the fourth lens plate 4 can be externally fitted from above into the opening edge 42a of the male connector cover 43a of the third lens plate 4, 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.

[0032] Therefore, in this embodiment, a guide inclined surface 45a is formed on the outside of the opening edge 42a of the male side 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 side connector cover 43b.Therefore, as shown in Figure 9, when the fourth lens plate 4 (lower right of Figure 4) is attached between the first and third lens plates 4 that have already been fixed, first, the opening edge 42a of the male side connector cover 43a of the fourth lens plate 4 is inserted diagonally from above to fit inside the opening edge 42b of the female side connector cover 43b of the first lens plate 4, and then the opening edge 42b of the female side connector cover 43b of the fourth lens plate is externally fitted from above into the opening edge 42a of the male side 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 without any difficulty.

[0033] 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.

[0034] As described above, according to the LED ceiling light of this embodiment, the lens plate 4 is provided with the 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 externally to the opening edge 42a of the male connector cover 43a so as to overlap, so that it is possible to prevent a gap from being formed between the male and female connector covers 43a and 43b. Therefore, the connectors 33a and 33b of the LED board 3 are reliably covered by the connector covers 43a and 43b, and foreign objects such as small insects and fine dust do not 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.

[0035] 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 also be attached smoothly and without any difficulty, as described above.

[0036] 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 the present invention is not limited to this, and the lens plate cover may cover a part of the light-emitting board (LED board). In short, any configuration can be adopted as long as a gap is not formed between the lens plates by overlapping the female cover of one lens plate of adjacent lens plates on the outside of the male cover of the other lens plate.

[0037] 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 thereto, 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 ring or an 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 plate is arranged side by side.

[0038] 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.

[0039] 2 and 10, in this embodiment, the square frame-shaped light source unit 2 is arranged to rotate 45° around the vertical axis with respect 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 luminance.

[0040] 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, when the light source unit 2 is arranged in this manner relative to the lighting cover 5, as will be described later in detail, the luminance in the areas along the sides of the lighting cover 2 is low, and the lighting cover as a whole experiences luminance unevenness, making it impossible to obtain a good sense of brightness.

[0041] 2 and 10, when each corner of the light source unit 2 is disposed corresponding to the middle of each side of the lighting cover 5, the corners of the light source unit 2, i.e., the opposing ends of two adjacent light source unit components 20, are disposed close to the side 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 side of the lighting cover 5, and the periphery of the side of the lighting cover 5 is evenly illuminated by the reflected light. As a result, almost the entire lighting cover 5 can be illuminated with no unevenness in brightness, providing a good sense of brightness to the user.

[0042] In fact, the luminance was measured at required positions in the ceiling light of the embodiment shown in Fig. 10 and the ceiling light of the reference example shown in Fig. 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.

[0043] As a result, in the embodiment of FIG. 10, point A is 1585 cd / m 2 , point B is 6220cd / m 2 , point C is 6000cd / m 2 , point D is 5000cd / m 2 , point E is 6180cd / m 2 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 over almost the entire range except for point A, and a good sense of brightness was obtained.

[0044] In contrast, in the reference example of Figure 11, point A is 1565cd / m 2 , point B is 4600cd / m 2 , point C is 5400cd / m 2 , point D is 4400cd / m 2 , point E is 6000cd / m 2 Therefore, point C was approximately 10% darker than point E, point B was approximately 65% ​​darker than point E, point D was approximately 20% darker than point C, and point A was 65% darker than point D. Thus, uneven brightness was observed in many areas, and a good sense of brightness could not be obtained. [Industrial Applicability]

[0045] The lighting fixture of the present invention can be suitably used, for example, as an LED ceiling light attached to a ceiling. [Explanation of symbols]

[0046] 3: LED board (light-emitting board) 33a, 33b: Connector 4: Lens plate 42a, 42b: opening edge (tip edge) 43a: Male connector cover (male cover) 43b: Female connector cover (female cover) 44: Both side walls 45a, 45b: Guide inclined surface

Claims

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 device 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. 3. 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.

4. 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, 3. 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.

5. the male cover has side walls covering both side surfaces of the one 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 leading edge of the female cover are arranged to overlap the outsides of both side walls at the leading edge of the male cover.

6. 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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