JP2012178318A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture enabling uniform light distribution by securing strength of a light-transmitting panel.SOLUTION: In the lighting fixture, an optical axis LB emitted from LED light sources 41 facing a lower surface 202 of a fixture body 20 to the inside of the fixture body 20 is inclined toward a light-transmitting panel 50. The light-transmitting panel 50 emits uniform light while securing strength of the same 50, since a diffusion section 54 is arranged at a location where the optical axis LB of the LED light sources 41 is projected in the light-transmitting panel 50 without changing plate thickness of the light-transmitting panel 50.

Description

  The present invention relates to a luminaire that uses an LED (light emitting diode) as a light source and is attached to a ceiling surface to illuminate the lower part.

2. Description of the Related Art Conventionally, a lighting fixture that uses an LED as a light source and is attached to a ceiling surface to illuminate a lower part is known (see, for example, Patent Document 1).
As illustrated in FIG. 7, the lighting fixture 100 described in Patent Literature 1 includes a fixture main body 102 installed on a ceiling surface 101, a light source body 103 including a plurality of LEDs, a reflector 104, and a translucent panel 105.

The instrument main body 102 is formed in a square shape with a metal such as an iron plate, and has a mounting bracket 107 which is detachably installed on a hook ceiling 106 installed on the ceiling surface 101 at a substantially central portion.
The light source body 103 is provided so as to be opposed to the outer edge portions of two opposite sides on the lower surface of the instrument main body 102, and irradiates light toward the inside of the instrument main body 102.
The reflection plate 104 has a flat plate shape in which a white color is applied to a metal plate, and has an inclined surface that is gradually and gradually inclined from an intermediate portion toward a substantially central portion of the instrument main body 102. Thereby, the light from the light source body 103 is reflected downward.

The translucent panel 105 is made of translucent milky white translucent synthetic resin, and is attached so as to cover the light source body 103 and the reflector 104 by covering from below the instrument body 102.
The translucent panel 105 is formed such that its thickness decreases from the outer peripheral part to the central part of the translucent panel 105, and the transmittance increases from the outer peripheral part to the central part. Yes.

Therefore, the light emitted from the light source body 103 is reflected downward by the reflecting plate 104 and enters the translucent panel 105.
The translucent panel 105 is configured such that the transmittance at the center located far from the light source body 103 is higher than the transmissivity at the peripheral edge near the light source body 103, and thus uneven brightness in the translucent panel 105 is reduced. To reduce.

JP 2008-300203 A (FIG. 1)

  However, in the luminaire 100 described in Patent Document 1 described above, the thickness of the central portion of the translucent panel 105 is made thinner than that of the peripheral portion, so that luminance unevenness is eliminated and light distribution is made uniform. However, there is a problem that the strength of the translucent panel 105 is weakened.

  The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a luminaire that can ensure the strength of a light-transmitting panel and make light distribution uniform.

  The lighting fixture of the present invention includes a fixture main body that is attached to a surface to be attached, an LED light source that is provided facing the lower surface of the fixture main body and that irradiates light inside the fixture main body, and receives light from the LED light source. A translucent panel that emits light in the illumination direction, tilts the optical axis of the LED light source toward the translucent panel, and diffuses the light source on the translucent panel where the optical axis of the LED light source is projected Is provided.

  Moreover, the lighting fixture of this invention changes the light transmittance of the said spreading | diffusion part by the center part far from the said LED light source in the said translucent panel, and the edge part near the said LED light source.

  In the lighting fixture of the present invention, the diffusing portion is formed in an uneven shape.

  In the lighting fixture of the present invention, the uneven shape is formed to be small in the central portion far from the LED light source in the translucent panel and large in the end portion close to the LED light source.

  Furthermore, as for the lighting fixture of this invention, the said uneven | corrugated shape is formed in the inner surface of the said translucent panel.

  In the present invention, since the diffusing portion is provided at a position where the optical axis of the LED light source in the panel is projected, illumination having an effect that the light transmitting panel can emit light uniformly while ensuring the strength of the light transmitting panel. Equipment can be provided.

The whole perspective view which looked at the lighting fixture of the embodiment concerning the present invention from the lower part The exploded perspective view which looked at the lighting fixture of embodiment which concerns on this invention from the downward direction Sectional drawing which cut | disconnected the lighting fixture of embodiment which concerns on this invention in the center (A) It is the perspective view which looked at the lighting fixture of embodiment which concerns on this invention from upper direction, (B) is the perspective view cut | disconnected in the BB position in (A). 4A is an enlarged perspective view of a V portion in FIG. 4B, and FIG. 4B is an enlarged perspective view of a B portion in FIG. A perspective view of the inner surface of the translucent panel and its enlarged view (A) is sectional drawing of the conventional lighting fixture, (B) is the top view which looked at the lighting fixture from the downward direction

Hereinafter, the lighting fixture of embodiment which concerns on this invention is demonstrated using drawing.
In addition, in the following description, the case where a lighting fixture is attached to a to-be-attached surface and the downward direction is illuminated is demonstrated. Therefore, unless otherwise indicated, upper (upper, upper, etc.) means the ceiling surface side, and lower (lower, lower, etc.) means the floor surface side.

As shown in FIG. 1, the lighting fixture 10 of embodiment which concerns on this invention is suitable for attaching to the ceiling surface 11 grade | etc., Which is a to-be-attached surface, and mainly illuminating below.
As shown in FIG. 2 and FIG. 3, the lighting fixture 10 has, for example, a square plate-like fixture main body 20 having a fitting 21 for attachment to the hook ceiling 12 attached to the ceiling surface 11.

An upper unit 30, an upper frame 32, and an upper panel 31 are provided on the upper side of the instrument body 20 (that is, the ceiling surface 11 side). A plurality of packings 22 (see FIG. 4A) interposed between the top surface 201 of the fixture body 20 and the ceiling surface 11 are exposed from the opening 311 of the upper panel 31. Is provided.
Thereby, the wobbling of the instrument main body 20 attached to the ceiling surface 11 is prevented.
In addition, a lower unit 40 and a reflecting plate 60 that is a reflecting member are provided on the lower side of the instrument body 20 (that is, on the illumination direction side), and below the reflecting plate 60, the received light is diffused. A light transmissive panel 50 is attached.

The upper unit 30 includes a plurality of LED light sources 301 and irradiates light outward in four directions.
Here, four upper units 30 are attached to the upper side of the instrument body 20 in parallel with the four sides of the instrument body 20, but the number is not limited.

As shown in FIG. 3, the lower unit 40 is provided with two lower units 40 along two opposing sides of the lower surface 202 of the instrument body 20. Is not limited. The lower unit 40 irradiates light toward the inside of the instrument body 20.
The lower unit 40 has a plurality of LED light sources 41. For example, it is possible to use an elongated rectangular cross section in which a plurality of LED light sources 41 are arranged along the longitudinal direction inside a housing 42 having an open surface.

The lower unit 40 is attached in a state where the optical axis LB of the LED light source 41 is inclined toward the translucent panel 50, that is, downward from the horizontal.
By tilting the housing 42 of the lower unit 40 and attaching it to the instrument holder 20, the optical axis LB can be directed downward. Alternatively, the optical axis LB can be directed downward by attaching the LED light source 41 while tilting downward in the housing 42.

As shown in FIGS. 2 and 3, a reflector 60 that is slightly smaller than the instrument body 20 is attached below the instrument body 20 (downward in FIG. 3). The reflecting plate 60 has an overall rectangular shape, and has a substantially quadrangular pyramid shape pointed downward (downward in FIGS. 2 and 3).
That is, the reflecting plate 60 is attached to the inner side of the lower unit 40 attached to the outer edge portion of the instrument body 20, and the lower surface 61 reflects light from the lower unit 40 downward.

  A translucent panel 50 is detachably attached below the lower unit 40 and the reflection plate 60. The translucent panel 50 emits light by incident light reflected from the reflecting plate 60 and diffuses light downward in the illumination direction, and is provided with panel covers 51 having low light transmittance at a plurality of locations. ing.

As shown in FIG. 1, the panel cover 51 is provided along two opposing sides of the translucent panel 50 in the vicinity of the ends that are symmetrical with respect to the center of the instrument body 20. As shown in FIG. 3, the panel cover 51 is provided corresponding to the position where the lower unit 40 is provided, and prevents the lower unit 40 from being reflected on the translucent panel 50 and becoming a shadow. .
In addition, the panel cover 51 is provided with a first hole 52 and a second hole 53, and a brightness sensor, a human sensor, a heat sensor are provided inside the first hole 52 or the second hole 53. A sensor, a reception sensor for receiving a signal from the signal transmission device, and the like can be arranged.

As shown in FIGS. 4 and 5, a diffusing portion 54 is provided at a location where the optical axis LB of the LED light source 41 of the lower unit 40 in the translucent panel 50 is projected.
The diffuser 54 has different light transmittances in the central portion 501 far from the lower unit 40 and the end portion 502 close to the lower unit 40 in the translucent panel 50.
That is, the light transmittance at the central portion 501 of the light transmitting panel 50 is set to be larger than the light transmittance at the end portion 502 of the light transmitting panel 50.

As shown in FIG. 6, the diffusion portion 54 is configured by an uneven shape (uneven portion) formed in parallel along the longitudinal direction of the lower unit 40. The uneven portion 541 in the central portion 501 (center point CP) of the translucent panel 50 is formed with uneven portions smaller than the uneven portion 542 in the end portion 502 of the translucent panel 50.
Here, an intermediate uneven part 543 having a size between the uneven part 541 and the uneven part 542 is provided between the uneven part 541 at the center part and the uneven part 542 at the end part, and three steps are provided. However, it is not limited to this. For example, it can be changed in three or more stages. Further, the size of the unevenness can be continuously changed from the central portion 501 toward the end portion 502.

Thereby, the light transmittance in the center part 501 of the translucent panel 50 is set larger than the light transmittance in the edge part 502. FIG.
Note that it is desirable to form the uneven portions 541 and 542 on the inner surface of the translucent panel 50.
5B illustrates a mountain shape (triangle) as the concavo-convex shape, but is not limited thereto. For example, a semicircular shape or a rectangular shape is also possible.

As mentioned above, according to the lighting fixture 10 of embodiment which concerns on this invention demonstrated from the LED light source 41 of the lower unit 40 provided facing the lower surface 202 of the fixture main body 20, it irradiates toward the inner side of the fixture main body 20. FIG. The optical axis LB is tilted toward the translucent panel 50 side.
And since the spreading | diffusion part 54 was provided in the location where the optical axis LB of the LED light source 41 in the translucent panel 50 is projected, without changing the board thickness of the translucent panel 50, ensuring the intensity | strength of the translucent panel 50, The translucent panel 50 can emit light uniformly.

  Moreover, since the diffuser 54 has changed the light transmittance at the central portion 501 far from the LED light source 41 and the end portion 502 close to the LED light source 41 in the translucent panel 50, the light emission in the translucent panel 50 can be made uniform. .

  Further, since the uneven portions 541, 542, and 543 are provided in the diffusion portion 54, the light transmittance can be changed between the center portion 501 and the end portion 502 without changing the thickness of the light transmitting panel 50. The strength of the panel 50 can be secured.

  Further, since the uneven portions 541, 542, and 543 are formed small at the central portion 501 far from the LED light source 41 and large at the end portion 502 close to the LED light source 41 in the translucent panel 50, the central portion 501 and the end portion 502 are formed. And can change the light transmittance.

Furthermore, since the uneven portions 541, 542, and 543 are formed on the inner surface of the translucent panel 50, the outer surface of the translucent panel 50 can be formed flat.
Thereby, without impairing the external appearance of the lighting fixture 10, light transmittance can be changed and light emission can be equalized.

  In addition, the lighting fixture of this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.

10 Lighting equipment 11 Ceiling surface (attached surface)
DESCRIPTION OF SYMBOLS 20 Instrument body 202 Lower surface 41 LED light source 50 Translucent panel 501 Center part 502 End part 54 Diffusion part 541,542 Uneven part (uneven shape)
LB Optical axis

Claims (5)

An instrument body attached to the surface to be attached;
An LED light source that is provided facing the lower surface of the instrument body and irradiates light inside the instrument body;
A translucent panel that receives light from the LED light source and emits light in the illumination direction;
Tilt the optical axis of the LED light source toward the translucent panel,
The lighting fixture which provided the spreading | diffusion part in the location where the optical axis of the said LED light source in the said translucent panel is projected. The lighting fixture according to claim 1,
The said diffusion part is a lighting fixture which changed the light transmittance by the center part far from the said LED light source in the said translucent panel, and the edge part near the said LED light source. The lighting fixture according to claim 1 or 2,
The diffusing portion is a lighting fixture formed by an uneven shape. The lighting fixture according to claim 3,
The said uneven | corrugated shape is a lighting fixture formed small in the center part far from the said LED light source in the said translucent panel, and large at the edge part near the said LED light source. The lighting fixture according to claim 4,
The uneven shape is a lighting fixture formed on an inner surface of the translucent panel.

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