JP2008021561A - Illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to make a room (space) as a whole brightly visible by LED illumination. <P>SOLUTION: This illumination device is provided with a white LED 3 to emit light for illumination, a Fresnel lens 6 in which an inclined face group 8 to refract the light is cocentrically formed in a face opposite to this white LED 3 and in which a reflecting face 7 is formed outside that inclined face group 8, and a support part 5b to separate the white LED 3 and the Fresnel lens 6 from each other with a prescribed spacing and to support the light emitted from the while LED 3 and reflected by the reflecting face 7 so as to discharged outside from between each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting device using a light emitting element such as a light emitting diode (hereinafter referred to as LED) as a light source.

  In recent years, light sources such as white LEDs have come to be used in lighting devices.

  A white LED is usually used in combination with a lens because the light emitting portion is small and the brightness is darker than that of a conventional fluorescent lamp.

Conventionally, a total reflection composite lens (hereinafter referred to as a “cup lens”) having a particularly high light collection efficiency has been used as a lens combined with a white LED, and the light emitted from the white LED is reflected on the paraboloid of the cup lens. Light distribution is controlled so that the light is reflected and emitted in one direction (see, for example, Patent Document 1).
JP 2003-281909 A

  However, in the case of the conventional technique, the light of the white LED is totally reflected by the cup lens and used, so that it is bright only in one direction.

  For this reason, the brightness of the lens surface from which light is emitted becomes extremely high, the brightness around the cup lens or around the LED lighting fixture becomes extremely low, the brightness difference is large, and glare occurs.

  In other words, since only light that passes through the exit surface from the inside of the cup lens can be used as illumination, when the lighting device is, for example, a ceiling-mounted lighting fixture, the light emitting portion of the fixture itself is extremely bright, while the surrounding ceiling portion is There was a problem that when it was dark and the room (space) was viewed as a whole, the lighting seemed dark and it was uncomfortable as a human sense.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide an illuminating device capable of reducing a luminance difference between a light emitting portion and its surroundings so that the entire room (space) looks bright. To do.

  In order to solve the above-mentioned problems, an illumination device according to a first aspect of the present invention includes a base; a light source disposed on the base; a lens surface disposed opposite to the base; A lens body in which an inclined surface that reflects and transmits the reflected light is concentrically formed and a reflecting surface is formed on an outer peripheral portion of the inclined surface; and the base and the lens surface are spaced apart at a predetermined interval. And a supporting member that supports the light so that light can be emitted from the space to the side.

  In the first aspect of the present invention, the lens body is formed with a concentric inclined surface and a reflecting surface is formed on the outer peripheral portion thereof, so that the light emitted from the light source is reflected by the reflecting surface to the side. Since it is emitted and the ceiling surface is illuminated, the luminance difference between the illumination part and the ceiling surface is reduced, and glare can be reduced.

A lighting device according to a second aspect of the present invention is the lighting device according to the first aspect, wherein a plurality of pairs of the light source and the lens body are provided.
In the invention according to claim 2, by providing a plurality of pairs of the light source and the lens body, it is possible to improve the illuminance as the whole lighting apparatus in addition to the effect of claim 1.

According to a third aspect of the present invention, there is provided a lighting device according to the first aspect, wherein the light source is a light emitting diode that emits light in which different wavelength components are mixed.
In the invention described in claim 3, since the light source is a light emitting diode that emits light in which different wavelength components are mixed, the structure of the light source is simple and the efficiency is increased. In addition to the effect of claim 1, the illumination device Can be configured at low cost and with high performance.

According to a fourth aspect of the present invention, there is provided a lighting device according to the first aspect, wherein the lens body is a Fresnel lens.
In the invention of claim 4, by using a Fresnel lens as the lens body, in addition to the effect of claim 1, the lighting device can be made thin.

  According to the first aspect of the present invention, the difference in luminance between the illumination part and the ceiling surface is reduced, and glare can be reduced.

  According to invention of Claim 2, in addition to the effect of Claim 1, the illumination intensity as the whole illuminating device can be improved.

According to the third aspect of the present invention, the structure of the light source is simple and the efficiency is increased. In addition to the effect of the first aspect, the illumination device can be configured at low cost and with high performance.
According to invention of Claim 4, in addition to the effect of Claim 1, an illuminating device can be comprised thinly.

  As described above, according to the present invention, the luminance difference between the light source and its surroundings is reduced, and the whole room (space) looks bright.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing a configuration of a lighting device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA of the lighting device in FIG. 1, and FIG. 3 is an enlarged view of a portion B of the cross-sectional view in FIG. is there.

  As shown in FIG. 1 and FIG. 2, this illumination device includes a substantially circular base 1, a white light emitting diode 3 (hereinafter referred to as “white LED 3”) as a light source for emitting illumination light, and a base 1. It is a ceiling-mounted type or wall-mounted type lighting device provided with a lighting cover 4 as a lens body fixed to the wall.

  An upper surface of the base 1 is fixed to, for example, a ceiling or a wall surface. The base 1 is provided with a base surface 2 which is an inner surface. A plurality of white LEDs 3 are arranged and fixed on the base surface 2 at substantially equal intervals. That is, the base 1 is provided with a plurality of white LEDs 3.

  For example, the white LED 3 is obtained by molding the periphery of a light emitting portion of an LED chip that emits blue light with a yellow fluorescent layer, and white light is mixed in a predetermined direction (downward in this case) with a mixed color of blue light and yellow light. It irradiates towards. That is, the white LED 3 is a light emitting diode that emits light in which different wavelength components are mixed. In addition, a monochromatic LED can also be used as the light source.

  The illumination cover 4 includes a circular plate surface 5a and a cylindrical support portion 5b raised from the edge thereof, and is formed of transparent or translucent glass or resin that transmits light. .

The support portion 5b supports the base surface 2 and the lens surface of the Fresnel lens 6 so that light can be emitted from a space formed by separating the base surface 2 and the lens surface at a predetermined interval.
That is, the support portion 5b is a support member that supports the base surface 2 and the lens surface of the Fresnel lens 6 at a predetermined interval and supports the light so that light can be emitted from the space sandwiched between the surfaces. I also serve.

  In the illumination cover 4, a plurality of Fresnel lenses 6 are formed in a substantially circular shape so as to be positioned immediately below each white LED 3.

  As shown in FIG. 3, the Fresnel lens 6 is formed on the upper surface of the illumination cover 4 facing the base surface 2. The Fresnel lens 6 is formed by concentrically forming an inclined surface group 8 that refracts and transmits the light emitted from the white LED 3 around the optical axis 9.

  A reflection surface 7 is formed on the outer peripheral portion of the inclined surface group 8 of the Fresnel lens 6, that is, the periphery thereof. The reflecting surface 7 may be formed by coating a mirror surface layer, or the upper surface of the lighting cover 4 itself may be formed as a diffusing surface having good reflectivity. Further, the reflecting surface 7 may be formed with a desired color.

  By using the reflective surface 7 as a color surface in this way, the color of the reflective surface 7 is projected on the ceiling or the like from the characteristics of the white LED, and a color rendering effect is obtained. By setting the reflectance of the reflecting surface 7 to 90% or more, for example, the brightness on the ceiling surface side can be ensured to a brightness that can reduce glare.

  This illuminating device is provided with a plurality of pairs of white LED 3 and Fresnel lens 6 to form one illumination.

Here, the illumination operation of the illumination device will be described.
In this illuminating device, when light emitted from the white LED 3 enters the Fresnel lens 6, the light passes through the Fresnel lens 6 and is emitted in a substantially parallel direction X, so that the light directly below the Fresnel lens 6 is illuminated. In this example, an example is shown in which light is emitted in a substantially parallel direction X. However, the light may not be parallel light depending on how the Fresnel lens 6 is designed.

  When the light emitted from the white LED 3 is incident on the reflecting surface 7 around the Fresnel lens 6, the light is reflected by the reflecting surface 7, passes through the side support portion 5b, and is emitted in the Y direction in FIG. And the ceiling surface is illuminated.

  Note that the light emitted from the side support portion 5 b is weaker than the light transmitted through the Fresnel lens 6 because of simple reflection (since it does not pass through the lens).

  Thus, according to the illumination device of this embodiment, when mounted on the ceiling, the light emitted from the white LED 3 passes through the Fresnel lens 6 and is illuminated immediately below, and the light is reflected by the reflecting surface 7. Since the ceiling surface is illuminated through the side surface of the illumination cover 4, it is possible to provide an illumination device that is less prone to glare and is uncomfortable for humans.

  Further, since the ceiling surface is brightened by the reflecting surface 7, the entire room or space can be illuminated brightly. Furthermore, light distribution can be controlled by the Fresnel lens 6, and a thin LED lighting device can be realized.

  Furthermore, if the support portion 5b is colored, for example, in red, the ceiling surface can be illuminated in red, and an effect can be obtained.

In addition, this invention is not limited only to the said embodiment, You may deform | transform a component in the range which does not deviate from the summary in an implementation stage. In addition, various inventions can be configured by appropriately combining a plurality of components disclosed in the embodiment.
For example, you may delete some components from all the components shown by the said embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  Specifically, in the above embodiment, the circular plate surface 5a and the cylindrical support portion 5b are exemplified as a part of the illumination cover 4 integrally formed. However, the support portion 5b is the illumination cover 4 Separately, several columnar spacers dedicated to support may be provided on the plate surface 5a to support the base surface 2 of the base 1 and the surface of the Fresnel lens 6 at a predetermined interval.

  In the above embodiment, the white LED 3 is used as the light source. However, in addition to this, white light may be generated by providing three color light sources such as a red LED, a blue LED, and a green LED. White light may be generated by emitting ultraviolet light emitted from a light source such as an LED through an RGB phosphor.

  Further, in the present embodiment, the white LED is used. However, not only this, but also an LED that emits a color similar to that of a general fluorescent lamp, such as a light bulb color, a daylight white color, a daylight color, and an orange color, may be used.

It is a disassembled perspective view which shows the structure of the illuminating device of one Embodiment of this invention. It is AA sectional drawing of the state which assembled the illuminating device of FIG. FIG. 3 is an enlarged view of a portion B in FIG. 2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Base surface, 3 ... White light emitting diode (white LED), 4 ... Illumination cover, 5a ... Plate surface, 5b ... Support part, 6 ... Fresnel lens, 7 ... Reflecting surface, 8 ... Inclined surface group , 9: Optical axis.

Claims (4)

A substrate;
A light source disposed on the substrate;
An inclined surface that refracts and transmits light emitted from the light source is concentrically formed on the lens surface disposed opposite to the base, and a reflecting surface is formed on the outer peripheral portion of the inclined surface. A lens body;
A support member that supports the base and the lens surface so that light can be emitted sideways from a space formed by separating the base and the lens surface;
An illumination device comprising: The lighting device according to claim 1.
A lighting device comprising a plurality of pairs of the light source and the lens body. The lighting device according to claim 1.
The illumination device, wherein the light source is a light emitting diode that emits light in which different wavelength components are mixed. The lighting device according to claim 1.
The illumination device, wherein the lens body is a Fresnel lens.

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