CN201462499U

CN201462499U - LED planar light source structure

Info

Publication number: CN201462499U
Application number: CN2009201193256U
Authority: CN
Inventors: 江程; 董学文
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-07
Filing date: 2009-05-07
Publication date: 2010-05-12
Anticipated expiration: 2019-05-07

Abstract

The utility model discloses an LED planar light source structure which comprises an aluminium baseplate, wherein a reflective membrane is pasted on the aluminium baseplate, a plurality of illuminants are installed on the aluminium baseplate, a light guide plate for diffusing light is arranged at the front of the illuminants, a diffuse transmission plate is arranged at the front of the light guide plate, and a free curved surface which is used for refracting light and corresponds to each illuminant one by one is arranged on the wall surface at one side of the light guide plate close to the illuminant. Transparent bodies with two-dimensional rotationally symmetric free curved surfaces are utilized for refracting the light, thereby increasing the irradiating area of an LED light source and also reducing the glare effect; the LED illuminants and the transparent bodies are correspondingly installed one by one, so that the planar light source structure can be increased or decreased according to actual requirements, conveniently expanded and used in multiple occasions.

Description

A kind of LED flat light source structure

Technical field

The utility model relates to technical field of semiconductor illumination, a kind of specifically LED flat light source structure.

Background technology

After electric light source has experienced this three phases of incandescent lamp, fluorescent lamp and high-intensity gas discharge lamp, people generally believe that the LED electric light source is the most promising new light sources now, advantages such as a plurality of LED are big with the luminosity of the multiple planar light source that is combined to form, good directionality, response speed are fast, prior LED has huge superiority at aspects such as power consumption and life-spans.Along with the continuous progress of LED manufacturing technology, its light efficiency is constantly soaring, and the light efficiency of large power white light LED has reached 100lm/w up to now, and stable product light efficiency also has more than the 90lm/w.This light efficiency make LED application more and more widely, comprise in widely used backlight field and be about to the general lighting field of large-scale application that wherein the lamp affixed to the ceiling in backlight field and general lighting field can generally be referred to as planar light source.

Though led light source long service life, energy consumption are low, but LED is a spot light, only emits beam to half space, and the result causes the adverse effect of two aspects: the one, and the light that light source sends directly shines the illuminance of ground skewness, middle bright dark all around, be solar effect; The 2nd, light source has strong dazzle, and euphorosia is very poor.So just need on led light source, increase illuminance uniformity, brightness uniformity and the elimination dazzle of planar light source device to improve led light source through secondary optics design even repeatedly optical design, improve euphorosia, make it to be applicable to the application of planar light source.

Led light source is applied in the planar light source at present, in the backlight field, in field of backlights, be divided into side-light type and straight-down negative structure by distribution of light sources position difference, many is side-light type, but along with the size of backlight increases, the optical design difficulty of side-light type also increases thereupon, the shortcoming of side-light type maximum is that the light utilization efficiency of light source is very little, approximately has only about 50%, and quotes in lamp affixed to the ceiling at LED, relatively more rare at present, the product that can see just simply adds ground glass or diffuse reflector on its surface once in a while, but effect is not clearly, can not fundamentally solve the problem of Luminance Distribution inequality.

Summary of the invention

Problem to be solved in the utility model be exactly in the prior art to the design led light source structural shortcoming, a kind of LED flat light source structure simple in structure is provided, can effectively improve the utilization rate of light source, the uniformity of light-source brightness.

In order to solve the problems of the technologies described above, the utility model adopts following scheme: a kind of LED flat light source structure, comprise aluminium base and be installed in several illuminators on the aluminium base, the place ahead of described several illuminators is provided with the LGP that is used to spread light, it is characterized in that: be provided with and each illuminator free form surface that is used for refracted ray one to one near the wall of illuminator one side on the described LGP.

Described LGP is an overall structure or the integrative-structure that is combined into by multiple arrangement mode by several LGP unit.

As preferably, the lower surface of described LGP is the diffuse transmission face that plane or frosted were handled, and goes out that optical plane is easy to process, cost is low, and diffuse transmission face can play the effect of soft light.

As preferably, described free form surface is that the two dimension of guide light plate unit center position indent is rotated symmetrical free form surface.

Further, post reflective membrane on the described aluminium base, the light that reflective membrane can reflect the LGP unit reflexes on the LGP unit again, increases the exitance of light utilization efficiency and light.

Further, described LGP unit profile is square, and LGP is vertically and horizontally arranged into integrative-structure by the LGP unit with direction of warp and weft.

Further, described LGP unit profile is a hexagon, and LGP is staggered into a single integrated structure by the LGP unit with honeycomb style.

As preferably, the place ahead of described LGP is provided with the diffuse transmission plate, further comes softening light, and making distributes to become near the light that waits brightness near isolux light distributes, and improves the euphorosia degree.

As preferably, described illuminator is the LED light emitting diode.

Compared to existing technology, the LGP unit that the utility model utilization has the symmetrical free form surface of two dimension rotation reflects light, thereby increases the irradiated area of LED spot light, reduces glare effect simultaneously; LGP is integral by several LGP unit combination, and the brightness uniformity of planar light source and the illuminance uniformity that is radiated at target face are improved, the utilization ratio of optical energy height, and energy-conservation; Led light source and the corresponding one by one installation in LGP unit, so this planar light source can be changeable according to actual needs, expansion is convenient.

Description of drawings

Fig. 1 is the structural representation of the LGP unit of the utility model embodiment one;

Fig. 1 (a) is the A-A cutaway view among Fig. 1;

Fig. 2 is the overall structure schematic diagram of the utility model embodiment one;

Fig. 2 (a) is the B-B cutaway view among Fig. 2;

Fig. 3 is the structural representation of the LGP unit of the utility model embodiment two;

Fig. 3 (a) is the C-C cutaway view among Fig. 3;

Fig. 4 is the overall structure schematic diagram of the utility model embodiment two;

Fig. 4 (a) is the D-D cutaway view among Fig. 3.

The specific embodiment

Embodiment one:

The LED flat light source structure of the utility model embodiment one comprises aluminium base 3 shown in Fig. 2, Fig. 2 (a), several LED light emitting diodes are installed as illuminator 32 on the aluminium base 3, the place ahead of described several illuminators 32 is provided with the LGP 1 that is used to spread light, be provided with diffuse transmission plate 4 in the place ahead of LGP 1, come further softening light, make near isolux light distribution to become, improve the euphorosia degree near the light distribution that waits brightness.Shown in Fig. 1, Fig. 1 (a), described LGP 1 is that several square LGP unit 2 with free form surface 22 are combined into one structure by the longitude and latitude arrangement mode, and is simple in structure, easy to make.The lower surface of LGP unit 2 is an exiting surface 21; the another side of corresponding exiting surface 21 is the free form surface 22 that is used for refracted ray on the LGP unit 2; this free form surface 22 rotates symmetrical free form surface 22 for the two dimension of guide light plate unit 2 center position indents, can obtain by the reverse-engineering modeling.The lower surface of LGP 1 promptly can be the plane by this lower surface that the exiting surface 21 of several LGP unit 2 is formed, and is easy to process, cost is low, also can be the diffuse transmission face of handling through frosted, can play the effect of soft light.Post reflective membrane 31 on the described aluminium base 3, the light that reflective membrane 31 can reflect LGP unit 2 reflexes on the LGP unit 2 again, increases the exitance of light utilization efficiency and light.

Embodiment two:

The LED flat light source structure of the utility model embodiment two shown in Fig. 4, Fig. 4 (a), this structure and embodiment one are roughly the same, the LGP unit 2 of this LED flat light source structure kind that different is is a regular hexagon, and LGP 1 be staggered with honeycomb style by this regular hexagon LGP unit 2 into a single integrated structure, compact conformation, good looking appearance.

Two above-mentioned embodiment only are preferred structure of the present utility model, these two kinds of structures can reach better radiation response, the light source of LED forms the circular light spot of 3 meters of radiuses through LGP unit 2, and because indoor illumination intensity need be considered the comfortableness of vision, 2 exiting surfaces, 21 frosteds of LGP unit are handled, make human eye see that light fixture is not dazzling, light is soft evenly, is to realize that equiluminous is to the transformation that waits brightness.

The structure of LGP of the present utility model unit 2 not only is confined to above-mentioned two kinds; the profile of this LGP unit 2 also can be circle, triangle or irregular polygon; the arrangement mode that the structure of LGP 1 is described in above-mentioned two kinds of embodiment; also also have other multiple embodiments; variation or modification that any those skilled in the art does the utility model all are encompassed within the scope of patent protection of the present utility model.

Claims

1. LED flat light source structure, comprise aluminium base (3) and be installed in several illuminators (32) on the aluminium base (3), the place ahead of described several illuminators (32) is provided with the LGP (1) that is used to spread light, it is characterized in that: described LGP (1) is gone up wall near illuminator one side and is provided with and each illuminator free form surface (22) that is used for refracted ray one to one.

2. a kind of LED flat light source structure according to claim 1 is characterized in that: described LGP (1) is an overall structure or the integrative-structure that is combined into by multiple arrangement mode by several LGP unit (2).

3. a kind of LED flat light source structure according to claim 1 and 2 is characterized in that: the lower surface of described LGP (21) are the diffuse transmission face that plane or frosted were handled.

4. a kind of LED flat light source structure according to claim 2 is characterized in that: described free form surface (22) rotates symmetrical free form surface for the two dimension of guide light plate unit (2) center position indent.

5. a kind of LED flat light source structure according to claim 1 is characterized in that: post reflective membrane (31) on the described aluminium base (3).

6. a kind of LED flat light source structure according to claim 2 is characterized in that: described LGP unit (2) profile is square, and LGP (1) is vertically and horizontally arranged into integrative-structure by LGP unit (2) with direction of warp and weft.

7. a kind of LED flat light source structure according to claim 2 is characterized in that: described LGP unit (2) profile is a hexagon, and LGP (1) is staggered into a single integrated structure by LGP unit (2) with honeycomb style.

8. a kind of LED flat light source structure according to claim 1 and 2 is characterized in that: the place ahead of described LGP (1) is provided with diffuse transmission plate (4).

9. a kind of LED flat light source structure according to claim 1 is characterized in that: described illuminator (32) is the LED light emitting diode.