JP3161425U - ceiling light - Google Patents

Abstract

The present invention provides a ceiling light capable of efficiently guiding irradiation light from an LED into a room when performing indoor lighting using the LED. A ceiling light C includes an attachment portion for attaching to a ceiling, a main body portion 1 provided below the attachment portion, and a light source portion accommodated in the main body portion 1. An LED group comprising a large number of LEDs 12a that constitutes a light source part and is arranged to irradiate light toward the periphery of the main body part 1 in the horizontal direction, and a light guide plate 10 into which irradiation light from the LED group is introduced; And light deflecting means for guiding the irradiation light introduced into the light guide plate 10 downward. [Selection] Figure 3

Description

The present invention relates to a ceiling light including an attachment portion for attaching to a ceiling, a main body portion provided below the attachment portion, and a light source portion accommodated in the main body portion.

  Ceiling lights are lighting fixtures that are directly attached to the ceiling, and are often used as main lighting in living rooms such as houses and offices in order to brighten the entire room. As the light source, a ring-shaped fluorescent lamp is often used (for example, Patent Document 1 below).

Japanese Patent Laid-Open No. 2005-100809

  On the other hand, LEDs (light emitting diodes) have attracted attention as light sources for lighting fixtures. Unlike a fluorescent lamp, it is necessary to arrange a large number of small LEDs (for example, LED chips), and it is necessary to arrange the LEDs efficiently. Therefore, how to set the irradiation direction of light from the LED is an important factor for brightly illuminating the entire room.

  Therefore, the present invention has been made in view of the above circumstances, and its problem is to provide a ceiling light that can efficiently guide the irradiation light from the LED into the room when performing indoor lighting using the LED. That is.

In order to solve the above problems, the ceiling light according to the present invention is
An attachment for attaching to the ceiling;
A main body provided below the attachment portion;
A light source unit housed in the main body unit, and a ceiling light,
An LED group consisting of a number of LEDs arranged to irradiate light toward the horizontal periphery of the main body portion, constituting the light source portion;
A light guide plate into which irradiation light from this LED group is introduced;
And light deflecting means for deriving the irradiation light introduced into the light guide plate downward.

  The operation and effect of the ceiling light having such a configuration will be described. This ceiling light includes an attachment portion for attaching to the ceiling and a main body portion provided below the attachment portion. The main body is provided with an LED group (light source) composed of a large number of LEDs. This LED group is arranged to irradiate light toward the periphery of the main body in the horizontal direction. This irradiation light is introduced into the light guide plate, deflected downward by the light deflecting means, and led downward. By arranging the LED group as described above, it is possible to irradiate light in as wide a range as possible, and to make the irradiation light introduced by the light guide plate as uniform as possible. Moreover, the introduced irradiation light can be efficiently guided downward by the light deflection means. As a result, when performing indoor lighting using LED, the ceiling light which can guide | emit the irradiation light from LED efficiently indoors can be provided.

  In the present invention, the LED group is arranged in a ring shape, and includes a substrate that holds the LED group, and the light guide plate that is disposed on the outer side in the horizontal direction of the LED group and formed in a ring shape. It is preferable that the lower surface of the light plate functions as a light irradiation surface.

  Since the LED groups are arranged in a ring shape, the LEDs can be arranged using the space in the main body portion efficiently. In addition, the illumination surface into the room can be as uniform as possible. In the above description, the ring shape is not limited to a circle, and various ring shapes such as an ellipse, a square, and a polygon (a quadrangle, a pentagon, etc.) are conceivable. In short, it is only necessary to think of a closed two-dimensional space (the same applies to the following description). A ring-shaped light guide plate is provided outside the LED group in the horizontal direction. The ring shape of the light guide plate also includes various ring shapes as in the LED group. The lower surface of the light guide plate functions as a light irradiation surface, and the light irradiation surface also has a ring shape.

  In the present invention, it is preferable to include a heat radiating body that is disposed inside the substrate in the horizontal direction and is formed in a ring shape.

  By providing the heat radiating body on the inner side in the horizontal direction of the substrate holding the LED group, the heat generated from the LED can be efficiently released. By forming the radiator in a ring shape, the space inside the main body can be used efficiently.

  The light deflecting means according to the present invention is a light reflecting surface formed integrally with the light guide plate, and it is preferable that light irradiated from the LED is reflected downward by the light reflecting surface.

  By forming the light reflecting surface integrally with the light guide plate, the irradiation light from the LED group introduced in the horizontal direction can be reflected downward.

  The light reflecting surface is preferably constituted by a number of cut lines formed on the upper surface side of the light guide plate.

  As the light reflecting surface, a large number of cut lines can be formed on the upper surface side of the light guide plate. As a cut line, it can cut so that it may have appropriate cross-sectional shapes, such as cross-sectional V shape and U shape. A large number of cut lines can be formed by a large number of straight lines at a predetermined pitch, for example, and the direction of the lines can be formed not only in one direction but also in a form in which various directions are interwoven.

  It is preferable that the arrangement pitch of the cut lines is different between the central portion and the peripheral portion of the main body portion.

  For example, the arrangement pitch is made fine at the center and the arrangement pitch is made coarse at the periphery. Thereby, the illuminance of light derived from the light guide plate can be made as uniform as possible over the entire irradiation surface.

  The light deflecting means according to the present invention is a light reflecting portion provided on the upper surface of the light guide plate, and it is preferable that light emitted from the LED is reflected downward by the light reflecting portion.

  The light deflecting means can be constituted by a light reflecting portion provided on the upper surface of the light guide plate. Moreover, you may combine with the above-mentioned light reflection surface. As a light reflection part, for example, a white reflection sheet can be arranged on the light guide plate on the upper surface.

  The light reflecting portion may be formed by printing or painting. For example, by performing white printing (painting) on the upper surface of the light guide plate, light directed toward the upper surface of the light guide plate can be reflected downward. Thereby, the irradiation light from LED group can be utilized efficiently for illumination.

  In the present invention, it is preferable that a circuit unit for driving the LED group is disposed in a central space of the LED group arranged in a ring shape.

  By arranging the light source unit composed of the LED group and the circuit unit as described above, a space for component placement can be efficiently used.

The perspective view seen from the lower part which shows the external appearance structure of a ceiling light Side view showing external structure of ceiling light Sectional view showing the internal structure of the ceiling light Detailed view showing the structure of the light guide plate The perspective view which shows the structure of a heat radiator and LED

  A preferred embodiment of a ceiling light according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view seen from below showing the external configuration of a ceiling light, and FIG. 2 is a side view showing the external configuration of the ceiling light.

<Appearance structure of ceiling light>
As shown in FIGS. 1 and 2, the ceiling light C includes a main body portion 1, a power cord 2, a cord adjustment portion 3, and an attachment portion 4. A light source unit, a light guide plate 10, a circuit unit, etc., which will be described later, are accommodated and held in the main body unit 1. The attachment portion 4 is a socket for attaching the ceiling light C to the ceiling, and is manufactured according to a known standard. In the cord adjusting unit 3, the power cord 2 is accommodated therein, and the length of the power cord 2 can be adjusted. Thereby, the installation height etc. of the ceiling light C can be adjusted according to use environment or liking.

  The main body 1 includes a cover member 11, the central portion R1 includes a shape protruding in a conical shape, and the peripheral portion R2 is configured by a horizontal plane. The main body 1 is formed by sheet metal or resin molding. As shown in FIG. 1, when viewed from below, the light guide plate 10 includes a ring-shaped light irradiation surface 10b. That is, the irradiation light is irradiated from the peripheral portion R2, and is not irradiated from the central portion R1.

<Internal structure of ceiling light>
3 is a cross-sectional view showing the internal structure of the ceiling light C, FIG. 4 is a detailed view showing the structure of the light guide plate, and FIG. 5 is a perspective view showing the structure of the heat radiator and the LED.

  The cover member 11 constituting the main body 1 includes a central part 11R1 formed in a conical shape and a peripheral part 11R2 formed in a horizontal plane. A large number of slits 11a are formed in the central portion 11R1 as shown in the enlarged view. The slit 11a is provided to enhance the heat dissipation effect. The number and size of the slits 11a can be set as appropriate. The end portion 11b of the peripheral portion 11R2 is bent downward, so that the light guide plate 10 can be easily positioned.

  As shown in FIG. 5, a large number of LEDs 12a (corresponding to a light source unit) are arranged in a ring shape in the central portion R1. A large number of LEDs 12 a are collectively defined as an LED group 12. The irradiation light from the LED group 12 is irradiated outward in the horizontal direction as indicated by the arrows in FIG. Therefore, the irradiation light is introduced from the inner end surface 10 a of the light guide plate 10.

  The number of LEDs 12a arranged is, for example, 60 to 100, and an appropriate number is arranged according to the size of the ceiling light C or the like. The LED group 12 is fixed to the flexible substrate 13 by soldering.

  A ring-shaped heat radiator 14 is provided inside the LED group 12 in the horizontal direction. The heat radiating body 14 is made of aluminum and plays a role of efficiently releasing heat released from the LED group 12. As shown in FIG. 3, a cover member 15 is provided on the lower surface of the central portion R1 of the ceiling light C, and is formed of a circular metal plate (or resin plate). The LED group 12 and the radiator 14 are installed on the upper side of the cover member 15. The appearance surface of the cover member 15 and the light irradiation surface 10b (lower surface) of the light guide plate 10 are provided to be the same plane or substantially the same plane. The light irradiation surface 10b is subjected to non-glare coating for antireflection treatment.

<Configuration of light deflection means>
The light guide plate 10 is formed of a transparent acrylic plate, and the irradiation light from the LED group 12 is introduced from the inner end surface 10a thereof and led out from the light irradiation surface 10b facing downward. That is, it is necessary to deflect the irradiation light in the horizontal direction and lead it downward, and light deflection means for this purpose is provided.

  In FIG. 4, the light guide plate 10 is ring-shaped and has a hole in the center. Inside the hole, the LED group 12, the flexible substrate 13, and the radiator 14 are disposed. A reflection sheet 16 (corresponding to a light reflection portion) is disposed on the upper surface of the light guide plate 10. The reflection sheet 16 is, for example, a white resin sheet, and a material having a high light reflectance is used. A part of the irradiation light introduced from the inner end face 10 a is incident on the light guide plate 10 and then also travels toward the upper surface side of the light guide plate 10. The light directed toward the upper surface side is reflected downward by the reflection sheet 16. be able to. Thereby, light can be efficiently irradiated from the light irradiation surface 10b.

  Instead of the reflection sheet 16, the light reflection portion may be configured by performing printing (including coating) with high reflectance on the upper surface 10 c of the light guide plate 10. For example, by performing white printing (painting), light that has reached the upper surface side can be reflected downward.

  Further, as shown in FIG. 4B, a large number of cut lines 11d may be formed as light deflecting means. The cut line 11d can be formed on the upper surface 10c of the light guide plate 10 by diamond cutting. The cut line 11d is configured by a combination of a large number of horizontal lines and vertical lines in FIG. 4B. A combination of diagonal lines may be employed.

  The cross-sectional shape of the cut line 11d is formed by, for example, a V-shaped groove or a U-shaped groove. Thereby, the light in the horizontal direction can be reflected downward. The arrangement pitch of the cut lines 11d can be set as appropriate. As for the arrangement pitch, it is preferable to make the arrangement pitch fine at the center and coarse at the periphery. Thereby, the illuminance of light derived from the light guide plate 10 can be made as uniform as possible over the entire light irradiation surface 10b.

  Returning to FIG. 3, the circuit unit 17 is arranged in the central space of the main body 1. The circuit unit 17 includes a power supply circuit and an LED drive circuit. A sensor for operating the ceiling light C to be turned on / off with a remote controller is also provided.

  The cord adjusting unit 3 has a function of wrapping and accommodating a cord in the cord housing case 3a. The length of the power cord 2 can be adjusted by adjusting the amount by which the power cord 2 is wound.

<Another embodiment>
In the present embodiment, the LED may be a bullet type or a chip type. The emission color of the LED is not limited to a specific color. The shape of the main body 1 is not limited to the shape shown in FIG. 3, and various modifications are possible. For example, the whole may be a flat cylindrical shape.

  Moreover, the lower surface of the main body 1 is not circular, and various shapes such as a square, an ellipse, and a polygon can be employed. The arrangement of the internal LED groups 12 can also be changed according to the shape of the main body 1. For example, if it is the square main-body part 1, the LED group 12 can also be arrange | positioned at square ring shape. Of course, even if it is the square main-body part 1, you may arrange | position the LED group 12 in circular ring shape.

C Ceiling light R1 Center part R2 Peripheral part 1 Body part 2 Power cord 3 Cord adjustment part 4 Attachment part 10 Light guide plate 10a Inner end face 10b Irradiation face 10c Upper face 11 Cover member 11a Slit 11b End part 11d Cut line 12 LED group 12a LED
13 Flexible substrate 14 Radiator 15 Cover member 16 Reflective sheet 17 Circuit part

Claims (9)

An attachment for attaching to the ceiling;
A main body provided below the attachment portion;
A light source unit housed in the main body unit, and a ceiling light,
An LED group consisting of a number of LEDs arranged to irradiate light toward the horizontal periphery of the main body portion, constituting the light source portion;
A light guide plate into which irradiation light from this LED group is introduced;
A ceiling light comprising: a light deflecting means for deriving the irradiation light introduced into the light guide plate downward. The LED group is arranged in a ring shape, and a substrate for holding the LED group;
The light guide plate disposed in the horizontal direction outside the LED group and formed in a ring shape,
The ceiling light according to claim 1, wherein a lower surface of the light guide plate functions as a light irradiation surface. The ceiling light according to claim 2, further comprising a heat radiating body disposed in a horizontal direction of the substrate and formed in a ring shape. The said light deflection | deviation means is a light reflection surface integrally formed in the said light-guide plate, and reflects the light irradiated from LED by this light reflection surface to the downward direction. The ceiling light according to item 1. The ceiling light according to claim 4, wherein the light reflecting surface includes a plurality of cut lines formed on an upper surface side of the light guide plate. The ceiling light according to claim 5, wherein the arrangement pitch of the cut lines is different between a central portion and a peripheral portion of the main body portion. The said light deflection | deviation means is a light reflection part provided in the upper surface of the said light-guide plate, The light irradiated from LED is reflected in this downward direction by this light reflection part, The any one of Claims 1-6 characterized by the above-mentioned. The ceiling light according to claim 1. The ceiling light according to claim 7, wherein the light reflecting portion is formed by printing or painting. 4. The ceiling light according to claim 2, wherein a circuit unit for driving the LED group is disposed in a central space of the LED group arranged in a ring shape. 5.

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