Illuminating device

An illuminating device comprises a base, a light source and at least one first layer, wherein said light source is assembled on said base to emit a first color temperature light, while first layer is located on the base along the first light irradiation path. The first light is passed through the first layer to react with said first layer to form a second color temperature light for emission, wherein said first color temperature is ranged from 2800K to 20000K, while excitation wavelength range of said first layer is mainly beyond the wavelength of ultraviolet lights for further adjusting the second color temperature range.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The invention is related to an illuminating device design, more particularly to a light emitting diode (LED) illuminating device whose color temperature can be optionally adjusted as needed.

(b) Description of the Prior Art:

Articles illuminated by a natural light source or an artificial light source shall have enough lightness to appear coloring for human eyes to feel it, while when light disappears, coloring is also disappeared. The light, similar to colors, has a degree of warmth in psychological feeling to human beings. Therefore, light can be described by color temperatures and color can be represented by color coordinate, wherein both of them are very similar to each other. Hence, light colors can be flexibly manipulated to form a favorable environment atmosphere thereby to satisfy different needs of scenarios, such as that the warm and soft atmosphere and feeling of softness for indoor woods, cloths and carpets can be enhanced by low color temperature lights. In hot area, an atmosphere of coolness and serenity can be made by high temperature color lights. Color temperature is defined to be expressed in absolute temperatures K, i.e. a standard black body is heated up to a certain temperature, from where its color is gradually changed from dark red, light red, orange, white, blue till the same color of light source, then the absolute temperature of said black body at that moment is the color temperature of said light source, whereas for different light source color temperature, the light color is also different. The light with a color temperature at 3000K appearing in warm color letting people feel relaxed and comfortable is suitable for residences or hotels . The light with a color temperature between 4000-5000K appearing in soft white color is suitable for offices or schools. The light with a color temperature at 6000K appearing in a cool daylight color is suitable for printing, textile or dyeing and finishing industries. However, color temperature cannot be changed by conventional illuminating devices which are unable to flexibly produce different color temperatures corresponding to different demands, therefore one of the two methods of prior art for color temperature adjustment is by letting the light of usually a white color light pass through color filters to produce different color temperatures, such as U.S. Pat. No. 6,755,555 B2, publicized on Jun. 29th, 2004 has disclosed a “Auxiliary illuminating device having an adjustable color temperature by controlling the amount of light passing through color filters”, wherein the portions including color filters of different colors and quantities are placed in front of a light source to change color temperatures of said light source according to required color temperatures.

Nevertheless, the different color lights produced by passing color filters as described in aforesaid method shall be further mixed by a good light mixing device, or only color lights instead of color temperature changes are formed. Further, as multiple color filters are required by said method, the volume and weight of the illuminating device are increased. Furthermore, said method also causes unnecessary loss of light strength.

Another method is to install more than two light sources in different colors in the illuminating device, whereby the lights are mixed to produce lights at different color temperatures, such as U.S. Pat. No. 6,379,022 B1, publicized on Apr. 30th, 2002 has disclosed an “Auxiliary illuminating device having adjustable color temperature”, wherein the light source of said art is a light source arrays with at least two colors, and at least one light emitting diode (LED) is typically utilized for color temperature adjustment purpose. Said method is obviously disadvantageous to require more than two kinds of lights at different colors, and that causes not only the volume of illuminating device but also the cost to increase. Further, requirement for additional circuits for control also causes manufacturing cost to increase.

SUMMARY OF THE INVENTION

In view of this, the invention discloses an innovative illuminating device for adjusting the color temperature whereof.

The illuminating device in the embodiment of the invention includes a base, a light source and at least one first layer, wherein said light source is assembled on the base to emit a first color temperature light, at least one first layer is located above the base along a first light irradiation path, and said first layer can be combined with a phosphor layer. Thereby, when first light is passed through said first layer to react with said first layer to form a second color temperature light for emission, wherein said first color temperature is ranged from 2800K to 20000K, while excitation wavelength range of said first layer is mainly beyond the wavelength of ultraviolet lights for adjusting the second color. temperature range.

One purpose of the invention is to disclose an illuminating device which includes at least one first layer to change the designated color temperature of the light source, wherein the better color temperature of illuminating device is above 2800K to 7000K.

DETAIL DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring toFIGS. 2 and 3,FIG. 2is a structure profile showing a preferred embodiment of the invented illuminating device.FIG. 3is a cross-sectional view showing a preferred embodiment of the invented illuminating device. As shown in the Figure, said illuminating device100comprises a base110, a light source120and at least one first layer131, wherein light source120is assembled on base110to illuminate a first color temperature light. As in the embodiment shown by the Figure, said illuminating device100is made with a first layer131at the inside surface of a light guiding component130(of course, it can also be made at the outside surface of said light guiding component) , while said first layer131can be coated by a phosphor layer thereon, wherein said light guiding component130is installed on base110along the first light irradiation path, whereby, the first color temperature light emitted from light source120is passed through light guiding component130to react with first layer131to form a second color temperature light emitted through said light guiding component130, wherein said first color temperature is ranged between 2800K to 20000, while the excitation wavelength range of said first layer131is mainly beyond the wavelength of ultraviolet lights. Further, said first layer is constituted by phosphor s selected from or any combination of the following:Y3+t+uAl5+u+2vO12+2t+3u+3v: Ce3+

In the embodiment, said light source120comprises a light emitting diode (LED) for the example, while said light source120can also comprise fluorescent lamps in other embodiments. The first light emitted from said light source is a white light whose first color temperature is ranged between 2800K to 20000K, and said light source120naturally can further include an illuminating component121and a second layer122. As shown inFIG. 4, the light emitted by said illuminating component121is passed through second layer122to form a first light in white color with the first color temperature ranging from 2800K to 20000K, wherein said illuminating component121can be a light emitting diode (in green light, blue light or red light) , while said second layer122is a phosphor layer and said first layer131can be sealed above each light source120, thereby to allow first light to react with first layer131to from a second color temperature light for emission.

The light source in other embodiments can be made to mix into a white color light by other methods such as using yellow phosphor s to match with blue light emitting diodes, or using green phosphor s and yellow phosphor s to match with blue light emitting diodes, or using white light emitting diode directly.

For example, the light guiding component130can be constituted by an optical lens132, wherein as shown byFIG. 5which is a schematic view showing the first embodiment of the light guiding component of the invention, the light guiding component can be a layer of optical lens132, and as shown byFIG. 6which is a schematic view showing the second embodiment of the light guiding component of the invention, the light guiding component130is constituted by multiple layers of optical lenses132, wherein the light guiding component130is made of any material of glass, plastic and thin film, etc.

FIG. 7is a schematic view of another preferred embodiment of the invented illuminating device, wherein another embodiment of the invention can be used to more clearly describe the illuminating device of the invention. As shown in the Fig., the illuminating device200comprises a base210, a light source220and a light guiding component230, wherein said light source220is assembled above the base210to emit a first color temperature light, and said light guiding component230is installed on base210along the first light irradiation path, while said light guiding component230further include a phosphor layer. Through this, the first color temperature light emitted by the light source220is passed through the light guiding component230to react with the phosphor layer to form a second color temperature light for emission through said light guiding component130. Further, said illuminating device200additionally comprises heat dissipating components240to be installed at the peripheral edge of base210to accelerate the heat dissipating efficiency of base210, wherein the heat dissipating component240such as heat dissipating fins can be made of metal materials.

For said reason, the illuminating device disclosed by the invention can be through at least one layer (can be combined with a phosphor layer) to simply change the designated color temperature of the light source, hence, said illuminating device is most importantly characterized to easily change the color temperature. Therefore, the invention is full of originality and progressiveness to meet the requirements for patent applications. Hence, it is herein applied according to law and your earlier approval on the claims is greatly appreciated.

The invention has been specifically described hereinbefore, wherein only preferred embodiments of the invention are described, and scope of the invention shall not be limited thereto. All equivalent changes or modifications thereof relative to claims of the invention shall be included in the claimed scope of the invention.