Lighting fixture

Abstract

To provide a lighting fixture that is free from luminance unevenness and can acquire a preferable brightness feeling.SOLUTION: A lighting fixture includes a regular square illumination cover 5 for covering a light source unit 2 including a light-emitting substrate 3. The light source unit 2 is formed into a regular square shape corresponding to a shape of the illumination cover 5, where side parts of the light source unit 2 are disposed while corresponding to side parts of the illumination cover 5.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a lighting fixture such as an LED ceiling light in which a light source unit, for example, having a lens plate attached to an LED substrate, is arranged to be covered by a lighting cover. [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, a light source unit that is attached to the fixture body and includes an LED board, and a lighting cover that is attached to the fixture body so as to cover the light source unit.

[0003] Most of these types of LED ceiling lights have circular lighting covers, but rectangular and square ones also exist. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6931809 Summary of the Invention [Problem to be solved by the invention]

[0005] However, among the conventional ceiling lights mentioned above, ceiling lights with square lighting covers had the problem that the entire lighting cover could not be illuminated with uniform brightness, resulting in uneven brightness (uneven luminance), and the user was unable to obtain a satisfactory sense of brightness.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a lighting device that can illuminate almost the entire lighting cover having a regular polygonal shape such as a square with even brightness, thereby providing a good sense of brightness. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention comprises the following means.

[0008] [1] A lighting fixture in which a light source unit having a light-emitting substrate is covered with a lighting cover having a regular polygonal shape, The light source unit is formed in a regular polygon shape corresponding to the shape of the lighting cover, A lighting fixture, characterized in that corners of the light source unit are arranged to correspond to sides of the lighting cover.

[0009] [2] The lighting device according to paragraph 1, wherein the light source unit is formed by joining together a plurality of long light source unit components, each of which has a lens plate attached to the light-emitting substrate, into a frame shape along the sides of a regular polygon.

[0010] [3] The lighting fixture according to paragraph 1 or 2, wherein the lighting cover is square. Effect of the Invention

[0011] According to the lighting fixture of the invention [1], the corners of the regular polygonal light source unit are arranged to correspond to the sides of the regular polygonal lighting cover, so that the corners of the light source unit are arranged close to the sides of the lighting cover, and the illumination light emitted from the light source unit is sufficiently reflected by the sides of the lighting cover, and the periphery of the sides of the lighting cover is illuminated by the reflected light. Therefore, almost the entire lighting cover can be illuminated evenly, and the user can feel a good brightness.

[0012] According to the lighting fixtures of the inventions [2] and [3], the above-mentioned effects can be obtained even more reliably. [Brief description of the drawings]

[0013] [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 schematic diagram for explaining luminance unevenness in the ceiling light of the embodiment. [Figure 10] FIG. 10 is a schematic diagram for explaining luminance unevenness in the ceiling light of the reference example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] A large number of LEDs (light emitting diodes) 31 are attached to the LED substrate 3 as light emitting elements. Two inner corners on both ends of the LED substrate 3 are cut at an angle of 45° to form joint notches 32. Furthermore, each LED substrate 3 is provided with a connector 33 corresponding to the joint notch 32.

[0020] 5, the four LED substrates 3 are arranged in a frame shape (annular 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 notches 32 of adjacent LED substrates 3 are joined together, so that adjacent LED substrates 3 are arranged at right angles.

[0021] Corresponding connectors 33 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 33, one pair of connectors 33 (connectors arranged on the upper side in FIG. 5) is 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.

[0022] 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 on both ends of the lens plate 4, in other words at the portions corresponding to the connection notches 32 of the LED substrate 3, connector covers 43 are integrally formed to cover the connectors 33 of the LED substrate 3 from below. The connector cover 43 is provided with side walls 44 covering both side surfaces of the corresponding connector 33, and an opening surface surrounded by an opening edge portion 42 of the connector cover 43 is disposed at an angle of 45° with respect to the longitudinal direction of the lens plate 4, corresponding to the connection notches 32 of the LED substrate 3.

[0023] As shown in FIG. 6 and the like, the lens plate 4 is disposed so as to cover each LED substrate 3 from the lower surface 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 33 of the LED substrate 3 is accommodated in the connector cover 43 of each lens plate 4. Furthermore, the opening edge portions 42 of the corresponding connector covers 43 of the adjacent lens plates 4 are disposed in a butted state, and the corresponding connector covers 43 are tightly joined to each other. In this way, the four lens plates 4 are disposed in a frame shape (annular shape) so that the adjacent lens plates 4 are disposed at right angles. In other words, the four light source unit components 20 constituted by the LED substrate 3 and the lens plate 4 are disposed so as to be joined in a frame shape (annular shape) along the sides of a square, forming the light source unit 2.

[0024] 2 and 9, in this embodiment, the square frame-shaped light source unit 2 is disposed at an angle of 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 disposed corresponding 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 disposed corresponding 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.

[0025] 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. 10. 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.

[0026] 2 and 9, when each corner of the light source unit 2 is disposed corresponding to the middle of each side of the lighting cover 5, the corner 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.

[0027] In addition, in the ceiling light of this embodiment, the connector covers 43 provided on the opposing ends of adjacent lens plates 4 are closely butted against each other, so that the connectors 33 provided on the opposing ends of adjacent LED boards 3 are securely covered by the connector covers 43. This makes it possible to prevent foreign objects such as small insects and fine particles of dust from entering the connectors 33, and thus to avoid adverse effects on the connectors 33 and, ultimately, the LED boards 3 due to the entry of foreign objects.

[0028] In the above embodiment, the present invention has been described as being applied to a ceiling light (lighting fixture) in which the light source unit 2 and the lighting cover 5 are square in bottom view, but the present invention is not limited thereto, and can also be applied to a lighting fixture in which the light source unit and the lighting cover are a regular polygon, such as a multiple of a quadrangle, for example an octagon, in bottom view. In short, it is sufficient that the light source unit is formed in a regular polygon shape that corresponds to (is similar to) the lighting cover, which is a regular polygon, in bottom view.

[0029] Furthermore, in the above embodiment, the present invention has been described using an example in which the light source unit is applied to a lighting fixture having a frame-shaped light source unit, but this is not limited to this. The present invention can also be applied to lighting fixtures in which the light source unit is provided not only on the side (frame) of a regular polygon, but also on part or the entirety of the side of a regular polygon, and the light source unit components (light-emitting elements such as LEDs) are provided thereon.

[0030] 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.

[0031] <Example> As an example, the luminance was measured at required positions in the ceiling light of the example shown in Fig. 9 and the ceiling light of the reference example shown in Fig. 10. 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 set at a distance of 1 m in front of the ceiling light (lighting cover 5).

[0032] As a result, in the embodiment of FIG. 9, point A was 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.

[0033] In contrast, in the reference example of Figure 10, 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]

[0034] 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]

[0035] 1: Equipment body 2: Light source unit 20: Light source unit component 3: LED board (light-emitting board) 4: Lens plate 5: Lighting cover

Claims

1. A lighting fixture in which a light source unit having a light emitting substrate is covered with a lighting cover having a regular polygonal shape, The light source unit is formed in a regular polygon shape corresponding to the shape of the lighting cover, A lighting fixture, characterized in that corners of the light source unit are arranged to correspond to sides of the lighting cover.

2. The lighting fixture according to claim 1 , wherein the light source unit is formed by joining a plurality of elongated light source unit components, each of which has a lens plate provided on the light emitting substrate, into a frame shape along the sides of a regular polygon.

3. The lighting fixture according to claim 1 or 2, wherein the light cover is square.

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