JP6121728B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  Due to the long life of lighting equipment and the rise in energy-saving thinking due to the 2011 Tohoku-Pacific Ocean Earthquake, demand for lighting equipment using LEDs instead of conventional lighting equipment using fluorescent lamps has increased. It has been growing rapidly in recent years.

  Here, the fluorescent lamp illumination device has an orientation angle of approximately 360 °, whereas the LED illumination device has a light distribution angle of approximately 150 °. Therefore, a technique for improving the light distribution angle of the LED lighting device has been proposed (see Patent Document 1).

JP 2012-146667 A

  However, in the technique described in Patent Document 1, there is a risk that unevenness of light peculiar to the lens is projected on the light-transmitting cover, and in particular, unevenness of light may appear on the outer peripheral portion of the light-transmitting cover where the LEDs are not assembled.

  An object of this invention is to provide the illuminating device which can reduce the nonuniformity of the light which arises in a translucent cover.

The present invention provides a light source substrate in which a plurality of LEDs are arranged on a top surface of the substrate so as to draw a plurality of concentric circles to form a planar light source, a translucent cover that covers the top surface from the side surface of the light source substrate, and the plurality of LEDs individually cover, the light of the light distribution angle θ1 emitted from the plurality of LED, have a function to enlarge the light distribution angle θ2 by passing through the structure from the incident side to the exit side, the outer peripheral from the center portion A plurality of lens portions arranged so as to draw a plurality of concentric circles and a plate-like portion that connects the plurality of lens portions, and only the surface of the lens portion located on the outer peripheral portion of the plurality of lens portions is uneven And a translucent LED cover that is positioned between the light source substrate and the translucent cover and covers the light source substrate.

  ADVANTAGE OF THE INVENTION According to this invention, providing the uneven | corrugated shape on the surface of an LED cover provides the illuminating device which can improve the diffusibility of the light from LED, and can reduce the nonuniformity of the light which arises in a translucent cover. it can.

It is a schematic exploded view which shows the component of the illuminating device which concerns on embodiment. It is a schematic front view including the partial cross section figure of the illuminating device which concerns on embodiment. It is a schematic sectional drawing which shows the AA cross section of FIG. 2 instruction | indication of the illuminating device which concerns on embodiment. It is a schematic enlarged view which shows the LED cover of FIG. 3 instruction | indication of the illuminating device which concerns on embodiment, and the outer peripheral part detail of a light source substrate. It is a schematic enlarged view which shows the change of the light distribution angle by the positional relationship of LED of the illuminating device which concerns on embodiment, and a lens shape, and the lens shape of the light emitted from LED. It is a schematic enlarged view which shows the embossed shape formed in the lens-shaped surface of FIG. 5 instruction | indication of the illuminating device which concerns on embodiment.

  Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate.

  As shown in FIG. 1, the lighting device 100 includes a translucent cover 10, an LED cover 20, a reflective sheet 30, a light source substrate 40, a reflective plate 50, a backbone 60, an insulating plate 70, and a control circuit 80. And is composed of.

  In the light source substrate 40, a planar light source is formed by arranging a plurality of LEDs 40a so as to draw a plurality of concentric circles on the upper surface of a disc-shaped substrate 40b.

  The reflection plate 50 is a base of the light source substrate 40.

  The insulating plate 70 houses a control circuit 80 that controls the lighting of the LED 40a.

  The control circuit 80 and the insulating plate 70 are enclosed by the reflecting plate 50 and the backbone 60.

  The LED cover 20 is disposed to face the light emitting surface of the light source substrate 40 and cover the light source substrate 40. Further, the LED cover 20 is covered with the translucent cover 10. The LED cover 20 is made of a translucent resin. The LED cover 20 includes a plurality of lens portions 20a that individually cover the plurality of LEDs 40a, a plate-like portion 20b that connects the plurality of lens portions 20a, and a plate-like portion 20b on the end surface of the entire circumference of the outer periphery of the plate-like portion 20b. It has the wall surface part 20c provided so that it might become perpendicular | vertical, and the end surface part 20d provided in the end surface which is not the plate-shaped part 20b side of the wall surface part 20c.

  The translucent cover 10 has a center portion 10a, a peripheral edge portion 10b located outside the center portion 10a, and a convex portion 10c. The translucent cover 10 is made detachable by assembling the convex portion 10c to the receiver 90 assembled on the outer peripheral portion of the backbone 60 by rotational insertion. The translucent cover 10 covers the upper surface (light emitting surface) from the side surface of the light source substrate 40. The light transmitted from the LED 40 a and transmitted through the LED cover 20 reaches the light transmitting cover 10, and the light is emitted to the outside of the light transmitting cover 10.

  In this embodiment, LED40a consists of two types, warm color LED and white LED, and the same number is used.

  In addition, the shape of the member which comprises the illuminating device 100 should just have each effect, and is not restricted to said shape.

  As shown in FIG. 2, in the light source substrate 40, the warm color LED and the white LED of the LED 40a are alternately arranged on one circumference of a plurality of concentric circles. There is an effect of reducing color unevenness that may occur in the light cover 10. In addition, even when the LED 40a is one type of single color or when there are three or more types, there is an effect that the color unevenness can be similarly reduced as long as there is no extreme deviation in the arrangement.

  Moreover, the light emission of the translucent cover 10 at the time of lighting can be made uniform by adjusting the number of arrangement | positioning of LED40a for every circumference in several concentric circles.

  As shown in FIG. 3, the terminal 40c is arrange | positioned at the board | substrate 40b. The LED 40a is caused to emit light by electrically connecting the terminal 40c and the control circuit 80 via the terminal lead 40d.

  The plurality of LEDs 40a have the same performance (except for the color type), and the light distribution angle θ1 of the LEDs 40a is uniform (see FIG. 5).

  In the present embodiment, the combined portion of the lens portion 20a and the plate-like portion 20b in the LED cover 20 has a disk shape, like the substrate 40a. The light source substrate 40 is covered by assembling the end surface portion 20d to the backbone 60 with screws or the like, and the risk of the user touching the light source substrate 40 is reduced.

  In the LED cover 20, the surface on the light source substrate 40 side is defined as an inner surface, and the surface on the translucent cover 10 side is defined as an outer surface.

  As shown in FIG. 5, the lens unit 20a has a function of expanding the light with a light distribution angle θ1 emitted from the LED 40a to the light distribution angle θ2 with the incident-side Ri and the emission-side Ro structure. . Thereby, compared with the light emission surface of the translucent cover of the illuminating device which does not have the lens part 20a, the light radiate | emitted from the peripheral part 10b of the translucent cover 10 of the illuminating device 100 with the lens part 20a increases, and the outer peripheral part of a translucent cover It is possible to reduce the unevenness of the light generated in the above. Thereby, the peripheral part 10b of the translucent cover 10 can also be shined beautifully.

  It should be noted that the LED 40a emits light by designing the distance h between the substrate 40b and the plate-like portion 20b on the inner surface of the LED cover 20, the Ri on the incident side of the lens portion 20a, and the Ro structure on the exit side to be optimal dimensions. The light with the light distribution angle θ1 can be used to the maximum extent.

  In addition, a plurality of convex shapes 20 g are provided circumferentially at equal intervals on the inner surface of the plate-like portion 20 b in the LED cover 20. By providing the convex shape 20g, when the LED cover 20 is fixed with a screw or the like, the deformation of the plate-like portion 20b formed by the tightening force is prevented from changing the dimension of the distance h, and irradiation as designed is obtained. There is an effect that it can be performed (see FIG. 4).

  In the present embodiment, the outer surface of the lens portion 20a facing the LED 40a located on the outer peripheral portion of the light source substrate 40 has a textured shape 20e. By having the embossed shape 20e, there is an effect that the light emitted from the LED 40a and enlarged by the lens portion 20a to the light distribution angle θ2 can be diffused in a wider range (see FIG. 6). The LED 40a located on the outer peripheral portion refers to the plurality of LEDs 40a located on the outer side among the plurality of LEDs 40a arranged so as to draw a plurality of concentric circles on the substrate 40b, and at least the plurality of LEDs 40a located on the outermost side. . In other words, in the present embodiment, the lens portion 20a having the embossed shape 20e on the outer surface is the lens portion 20a located on the outer side of the lens portion 20a, and is the lens portion 20a located on the outer peripheral portion 20f. .

  In general, the translucent cover is designed to be larger than the light source substrate and has a thin structure, so that the distance between the light source substrate and the translucent cover tends to be limited to be short. In many cases, the LED is located outside the light distribution angle of the LED located on the outermost part of the light source substrate. For this reason, when the lighting device is lit, only indirect light (reflected light from the translucent cover and other members) is present at the periphery of the translucent cover, compared to the central part of the translucent cover where direct light from the LED reaches. It becomes dark because it emits light.

  On the other hand, by having the embossed shape 20e on the outer surface of the lens portion 20a located on the outer peripheral portion 20f of the LED cover 20, it is possible to reduce the unevenness of light generated on the outer peripheral portion of the translucent cover due to the light diffusion effect. The peripheral edge 10b of the translucent cover 10 can also be illuminated beautifully.

  The embossed shape 20e can obtain the same effect as a minute uneven shape formed by post-processing such as blasting in addition to the one formed by transferring the mold shape. What is necessary is not particularly specified.

  Furthermore, the range having the embossed shape is not particularly limited, and may be partial.

  When compared with an illuminating device that does not have the embossed shape 20e on the outer surface of the lens portion 20a, unevenness of light is suppressed in the illuminating device that has the embossed shape 20e on the outer surface of the lens portion 20a. Light unevenness hardly occurs in the central portion 10a of the translucent cover 10 located at the center upper portion of the light source substrate 40 where the LEDs 40a are densely arranged, but the LED 40a located at the outermost outer periphery of the light source substrate 40 Light unevenness is likely to occur at the peripheral edge portion 10b of the transparent cover 10 that is not densely arranged.

  As shown in FIG. 3, by providing the embossed shape 20e on the outer surface of the lens portion 20a, it is possible to reduce the unevenness of light generated in the peripheral portion 10b of the translucent cover 10, and the center of the light source substrate 40 where the LEDs 40a are densely packed. This means that the peripheral portion 10b in which the LEDs 40a cannot be densely arranged is more effective than the central portion 10a located at the upper portion.

  Also, the light emitted from the LED 40a is reflected by the translucent cover 10 on the outer surface of the plate-like portion 20b on the outer peripheral portion of the LED cover 20, so that the reflection is returned to the inside of the instrument. By configuring the light A with a transparent resin material, the ratio of the reflected light B that passes through the LED cover 20 is reduced, and the light A is reduced again to the light-transmitting cover 10 as the irradiation light C, thereby improving the light emission efficiency. I can do things.

  In addition, the same effect as described above can be obtained by similarly providing the embossed shape 20e on the outer surface of the Rc structure outside the outer peripheral portion 20f of the LED cover 20. The Rc structure indicates a connection portion between the plate-like portion 20b and the wall surface portion 20c.

  In the present embodiment, as shown in FIG. 4, the light source substrate 40 as a whole can be obtained by installing the reflection sheet 30 made of an extremely thin polyester film having high reflectivity between the light source substrate 40 and the LED cover 20. It has a reflection function, and the light emission performance of the translucent cover 10 can be further improved.

  The reflection sheet 30 has a disk shape like the light source substrate 40, and has a structure that can be in close contact with the substrate 40b by providing the same number of holes as the LEDs 40a so as to avoid the plurality of LEDs 40a arranged on the light source substrate 40. . Furthermore, since the reflection sheet 30 is extremely thin, the distance h between the light source substrate 40 and the LED cover 20 is not hindered (see FIG. 5).

In the present embodiment, on the premise that light unevenness is more likely to occur at the outer peripheral portion than at the central portion of the translucent cover, the outer surface of the lens portion 20a and the plate-like portion 20b of the LED cover 20 is embossed 20e. It has been described that the use of can reduce the unevenness of light that occurs on the outer periphery of the translucent cover. However, if there is a possibility that unevenness of light may occur in the central portion of the translucent cover, the unevenness of light generated in the central portion of the translucent cover is provided by providing a textured shape on the outer surface of the central lens portion of the LED cover 20. There is an effect that it can be reduced. In order to reduce the unevenness of the light, only the central lens part of the LED cover may be provided with a textured shape, only the outer lens part may be provided with a textured shape, The lens portion may be provided with a textured shape.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Translucent cover 10a Center part 10b Peripheral part 10c Convex shape 20 LED cover 20a Lens shape 20b Plate-shaped part 20c Wall surface part 20d Wall surface end surface 20e Wrinkle shape (uneven shape)
20f Outer peripheral part 20g Convex shape 30 Reflective sheet 40 Light source board 40a LED
40b Substrate 40c Terminal 40d Terminal lead 50 Reflector plate 60 Backbone 70 Insulating plate 80 Control circuit 90 Receiving device 100 Illuminating device main body A Reflected light B from light-transmitting cover A Transmitting to LED cover A
C Reflected to the translucent cover again by the textured surface A
θ1 LED light distribution angle θ2 θ1 enlarged by lens shape
Ri lens configuration (inner surface)
Ro Lens configuration (outer surface)
Rc LED cover outer periphery R structure h Height dimension from the light source substrate to the inner surface of the LED cover

Claims (3)

A light source substrate in which a plurality of LEDs are arranged so as to draw a plurality of concentric circles on the upper surface of the substrate to form a planar light source;
A translucent cover covering an upper surface from a side surface of the light source substrate;
Individually cover the plurality of LED, the light of the light distribution angle θ1 emitted from the plurality of LED, have a function to enlarge the light distribution angle θ2 by passing through the structure from the incident side to the exit side, A plurality of lens portions arranged so as to draw a plurality of concentric circles from the central portion to the outer peripheral portion , and a plate-like portion connecting the plurality of lens portions, and a lens portion located on the outer peripheral portion of the plurality of lens portions. An illuminating device having a concavo-convex shape only on a surface, a translucent LED cover located between the light source substrate and the translucent cover and covering the light source substrate.
A light source substrate in which a plurality of LEDs are arranged so as to draw a plurality of concentric circles on the upper surface of the substrate to form a planar light source;
A translucent cover covering an upper surface from a side surface of the light source substrate;
Individually cover the plurality of LED, the light of the light distribution angle θ1 emitted from the plurality of LED, have a function to enlarge the light distribution angle θ2 by passing through the structure from the incident side to the exit side, A plurality of lens portions arranged so as to draw a plurality of concentric circles from the central portion to the outer peripheral portion , and a plate-like portion connecting the plurality of lens portions, and only the lens portion located in the central portion among the plurality of lens portions And a translucent LED cover that is provided between the light source substrate and the translucent cover and covers the light source substrate.
A light source substrate in which a plurality of LEDs are arranged so as to draw a plurality of concentric circles on the upper surface of the substrate to form a planar light source;
A translucent cover covering an upper surface from a side surface of the light source substrate;
Individually cover the plurality of LED, the light of the light distribution angle θ1 emitted from the plurality of LED, have a function to enlarge the light distribution angle θ2 by passing through the structure from the incident side to the exit side, A plurality of lens portions arranged so as to draw a plurality of concentric circles from the central portion to the outer peripheral portion , and a plate-like portion connecting the plurality of lens portions, and located at the central portion and the outer peripheral portion of the plurality of lens portions An illuminating device comprising: a light-transmitting LED cover which is provided with an uneven shape on a surface of a lens portion, is positioned between the light source substrate and the light transmitting cover and covers the light source substrate.