CN203641916U

CN203641916U - Fluorescent LED device

Info

Publication number: CN203641916U
Application number: CN201320646310.1U
Authority: CN
Inventors: 石光; 王泽忠; 侯琼
Original assignee: South China Normal University
Current assignee: South China Normal University
Priority date: 2013-10-18
Filing date: 2013-10-18
Publication date: 2014-06-11
Anticipated expiration: 2023-10-18

Abstract

The utility model discloses a fluorescent LED device which comprises a photodiffusion lamp shade, a rare earth fluorescent resin flake, an LED condensing lens, an LED chip and a combined reflection cup, wherein the combined reflection cup comprises an outer reflection cup and an inner reflection cup, the inner reflection cup is reversely buckled to be combined with the outer reflection cup, an opening in the bottom of the inner reflection cup is combined with the rare earth fluorescent resin flake to form a first closed space, the LED condensing lens and the LED chip are located in the first closed space, the LED chip is below the LED condensing lens and above the outer reflection cup, the outer reflection cup and the photodiffusion lamp shade are tightly connected to form a second closed space, and the first closed space is located in the second closed space. Fluorescent powder is separated from the LED chip so as to be good for cooling the chip and maintaining the use stability of the fluorescent powder; the light conversion scope is limited in a small area to reduce the amount of used fluorescent resin flake and the cost; the photodiffusion lamp shade protects the interior and also enables light to be soft and the appearance to be attractive.

Description

A kind of fluorescence LED device

Technical field

The utility model relates to the white LED light source device of lighting field, particularly a kind of fluorescence LED device.

Background technology

After blue-ray LED in 1994 makes a breakthrough, the three-color light-emitting system being made up of red-light LED, green light LED and blue-ray LED is just able to complete, lays a good foundation for realizing white light LEDs.Than traditional incandescent lamp and fluorescent lamp, white light LEDs has plurality of advantages: as long service life, the advantage such as energy-efficient, luminescence response is fast, volume is little, solidification, shock resistance are good, be described as 21 century green energy resource.

Preparing at present white light LEDs mainly uses fluorescent material to apply LED light transformation approach.Its method is that fluorescent material is dispersed in adhesive (normally epoxy resin adhesive), then is put LED chip surface.There are a lot of shortcomings in this method: as fluorescent material easily precipitates, disperses inhomogeneously in adhesive, cause LED to go out photosensitiveness poor, also there will be the problem such as color spot, colo(u)r bias.Meanwhile, what most of producers adopted is artificial dot fluorescent powder, and the uniformity of inefficiency, product is difficult for guaranteeing.In addition, due to fluorescent material and LED chip close contact, the high temperature that LED work produces is unfavorable for that fluorescent material keeps the stable of crystal structure, significantly shortens LED service life in affecting optical property.

On the other hand, the remote fluorescence LED in the past proposing is by mixing fluorescent material directly to make lampshade with light-transmissive resin, or fluorescence resin is pressed into film and fits with light-transmissive resin lampshade, like this fluorescent material is increased to whole lampshade by the small region being originally distributed on chip, greatly improve the consumption of fluorescent material, cause cost sharply to rise, simultaneously because of fluorescent lamp shade, in the time that LED chip is not worked, to present the color of fluorescent material not attractive in appearance, thereby be difficult for being accepted by market.

Utility model content

The purpose of this utility model, is to provide a kind of and makes white LED light source performance more stable for obtaining the fluorescence LED device of white light source, and the life-span is longer, and technique is simpler, and cost is lower.

Technical solution adopted in the utility model is: a kind of fluorescence LED device, it comprises light diffusion lampshade, rare-earth fluorescent resin sheet, LED collector lens, LED chip and Combined type reflection cup, described Combined type reflection cup comprises outside reflector and inner reflector, described inner reflector back-off shape is combined with outside reflector, after the cup bottom opening place of inner reflector and the combination of rare-earth fluorescent resin sheet, form the first confined space, described LED collector lens and LED chip are positioned at the first confined space, described LED chip is in LED collector lens below, outside reflector top, the second confined space that outside reflector forms after being closely connected with light diffusion lampshade, described the first confined space is positioned at the second confined space.

As the further improvement of technique scheme, described light diffusion lampshade can be circular arc or sheet.

As the further improvement of technique scheme, described light diffusion lampshade is the light-passing plastic of striped or frosted, or for adding the light-passing plastic of light diffusing agent.

As the further improvement of technique scheme, described light diffusing agent is esters of acrylic acid light diffusing agent or silicone based light diffusing agent.

As the further improvement of technique scheme, described rare-earth fluorescent resin sheet is the homogeneous mixture of light-passing plastic and fluorescent RE powder.

As the further improvement of technique scheme, described fluorescent RE powder is the combined fluorescent material of blue-ray LED bloom or green powder and rouge and powder formation.

As the further improvement of technique scheme, the scope of the rising angle of described LED collector lens is 5 ~ 30 °.

As the further improvement of technique scheme, described LED chip is single high-power blue-ray LED or several the great power LED modules that small-power blue-ray LED be packaged into of emission wavelength at 450 ~ 470nm.

As the further improvement of technique scheme, described Combined type reflection cup adopts aluminize metal reflective cup or the plastics reflector of aluminizing, and described outside reflector and LED chip are arranged on aluminum base PCB plate.

As the further improvement of technique scheme, between described light diffusion lampshade and rare-earth fluorescent resin sheet, there is 0.2 ~ 5cm gap; Between described rare-earth fluorescent resin sheet and LED chip, there is 0.2 ~ 5cm gap; The thickness of described rare-earth fluorescent resin sheet is between 0.1 ~ 5mm.

With respect to prior art, the beneficial effects of the utility model have:

1, fluorescent material and LED chip are separated, avoided fluorescent material to decay under high-temperature work environment, thereby greatly extend white light LEDs service life.

2, use rare-earth fluorescent resin sheet, save traditional gluing process, there will not be the problems such as fluorescent material precipitation, good manufacturability, production efficiency and product percent of pass are high.

3, most of light that low-angle collector lens sends LED chip is gathered in a small region, and carries out the conversion of blue light and synthesizing of white light in this region, reduces the consumption of rare-earth fluorescent sheet, thereby greatly reduces equipment cost.

4, light diffusion lampshade shape is unrestricted, and applicability is strong, when light is dazzled in minimizing, each parts is encapsulated in to device inside, not only attractive in appearance but also can play a protective role.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described.Obviously, described accompanying drawing is a part of embodiment of the present utility model, rather than whole embodiment, and those skilled in the art is not paying under the prerequisite of creative work, can also obtain other designs and accompanying drawing according to these accompanying drawings.

Fig. 1 is the forward sight structural representation that the utility model light diffusion lampshade is circular arc;

Fig. 2 is A-A sectional structure schematic diagram of Fig. 1;

Fig. 3 is the forward sight structural representation that the utility model light diffusion lampshade is sheet;

Fig. 4 is B-B sectional structure schematic diagram of Fig. 3;

Fig. 5 is a kind of fluorescence LED device of the utility model working effect figure;

Fig. 6 is the sectional structure schematic diagram of a kind of fluorescence LED device of the utility model LED module.

The specific embodiment

Below with reference to embodiment and accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is clearly and completely described, to understand fully the purpose of this utility model, feature and effect.Obviously; described embodiment is a part of embodiment of the present utility model, rather than whole embodiment, based on embodiment of the present utility model; other embodiment that those skilled in the art obtains under the prerequisite of not paying creative work, all belong to the scope that the utility model is protected.In addition, all connection/annexations of mentioning in literary composition, not singly refer to that member directly joins, and refer to and can, according to concrete performance, connect auxiliary by adding or reducing, and form more excellent draw bail.

With reference to Fig. 1～Fig. 4, a kind of fluorescence LED device, it comprises light diffusion lampshade 6, rare-earth fluorescent resin sheet 5, LED collector lens 2, LED chip 3 and Combined type reflection cup 1, described Combined type reflection cup 1 comprises outside reflector 12 and inner reflector 11, described inner reflector 11 back-off shapes and 12 combinations of outside reflector, after the cup bottom opening place of inner reflector 11 and 5 combinations of rare-earth fluorescent resin sheet, form the first confined space, described LED collector lens 2 and LED chip 3 are positioned at the first confined space, described LED chip 3 is in LED collector lens 2 belows, outside reflector 12 tops, the second confined space that outside reflector 12 forms after being closely connected with light diffusion lampshade 6, described the first confined space is positioned at the second confined space.

Be further used as preferred embodiment, described light diffusion lampshade 6 can be circular arc or sheet.

Be further used as preferred embodiment, described light diffusion lampshade 6 is the light-passing plastic of striped or frosted, or for adding the light-passing plastic of light diffusing agent, light-passing plastic is PMMA, PC or the PS of high printing opacity, high comprehensive performance.

Be further used as preferred embodiment, described light diffusing agent is esters of acrylic acid light diffusing agent or silicone based light diffusing agent.

Be further used as preferred embodiment, described rare-earth fluorescent resin sheet 5 is the homogeneous mixture of light-passing plastic and fluorescent RE powder, and light-passing plastic is PMMA, PC or the PS of high printing opacity, high comprehensive performance.

Be further used as preferred embodiment, described fluorescent RE powder is the combined fluorescent material of blue-ray LED bloom or green powder and rouge and powder formation.

Be further used as preferred embodiment, the scope of the rising angle of described LED collector lens 2 is 5 ~ 30 °.

Be further used as preferred embodiment, described LED chip 3 is for emission wavelength is at single high-power blue-ray LED or several the great power LED modules that small-power blue-ray LED is packaged into of 450 ~ 470nm.The assembling mode that uses the great power LED module (as Fig. 6) that many small-power blue-ray LEDs are packaged into use single LEDs chip similar, only need to choose suitable collector lens and Rational Arrangement LED chip 3.

Be further used as preferred embodiment, described Combined type reflection cup 1 adopts aluminize metal reflective cup or the plastics reflector of aluminizing, and described outside reflector 12 and LED chip 3 are arranged on aluminum base PCB plate 4.

Be further used as preferred embodiment, between described light diffusion lampshade 6 and rare-earth fluorescent resin sheet 5, have 0.2 ~ 5cm gap; Between described rare-earth fluorescent resin sheet 5 and LED chip 3, there is 0.2 ~ 5cm gap; The thickness of described rare-earth fluorescent resin sheet 5 is between 0.1 ~ 5mm.

As shown in Figure 5, LED chip 3 is generally blue-light LED chip, when LED switches on power while starting working, the blue light that LED chip 3 sends is through collector lens 2, be irradiated on rare-earth fluorescent resin sheet 5 with the angle of departure of 5 ~ 30 °, part blue light and fluorescent material effect produce the complementary light of blue light, and another part blue light is through rare-earth fluorescent resin sheet 5 and the complementary light stack synthesize white light producing.Inner prefocus cup 11 can be assembled the blue light of dispersing on a small quantity through reflection again by LED collector lens 2, thereby can improve light extraction efficiency.Synthetic white light is directive light diffusion lampshade 6 after the gathering of outside prefocus cup 12, and white light through repeatedly seeing through after refraction, finally obtains soft illumination white light in light diffusion lampshade 6 inside.

Adopt LED collector lens 2 to have following advantage:

1, LED chip 3 lighting angles are mostly more than 100 °, and light source disperses, and fluorescent material launching efficiency and penetration power are low, cause LED light efficiency low; After optically focused, most of blue light is collected utilization, and efficiency improves 25% left and right.

2, LED chip 3 because of emission angle large, there is certain light distribution at bright dipping route, be that mid portion luminous flux is high, weaken and both sides luminous flux is parabola, if rare-earth fluorescent resin sheet 5 consistency of thickness, mid portion fluorescent material can be changed completely, present white, edge fluorescent material conversion not exclusively, partially yellow, causes LED bright dipping inhomogeneous; Use LED collector lens 2 rear blue lights to be gathered in a small region, be evenly distributed, fluorescent material makes full use of, and bright dipping is even.

3, use the consumption of LED collector lens 2 rear rare-earth fluorescent resin sheets 5 to reduce, suppose that rare-earth fluorescent resin sheet 5 is for disc-shaped, in the situation that thickness is identical with fluorescent material content, if radius is reduced to original half, cost to fluorescent material in the original whole white light LEDs cost of 25%(accounts for greatly).

4, rare-earth fluorescent resin sheet 5 areas are larger, and the blue light that is reflected back chip is also more, and efficiency is just lower, use fine the addressing this problem of collector lens energy.Long-pending large with time conversion surface, be also that light-emitting area is large, the white light penetration power obtaining is poor, is not suitable for long distance illumination and uses.And the utility model uses small size rare-earth fluorescent resin sheet 5 cooperated with LED collector lenses 2 to can be good at improving the penetration capacity of white light, be applicable to long distance illumination application.

Below two embodiment:

Embodiment 1:

Rare-earth fluorescent resin sheet 5 thickness: 2.3mm, radius 10.8mm; Fluorescent material concentration: 4%; Fluorescent material kind: YAG bloom; ; LED chip 3 is apart from rare-earth fluorescent resin sheet 5 distances: 0.8cm; Light diffusion lampshade 6 is apart from rare-earth fluorescent resin sheet 5 distances: 0.5cm; The thick 0.1mm of blank sheet of paper; The positive white light of white light LEDs: 3W.

Embodiment 2:

Rare-earth fluorescent resin sheet 5 thickness: 3.0mm, radius 8mm; Fluorescent material concentration: 4%; Fluorescent material kind: green powder+rouge and powder; LED chip 3 is apart from rare-earth fluorescent resin sheet 5 distances: 2cm; Light diffusion lampshade 6 is apart from rare-earth fluorescent resin sheet 5 distances: 4.5cm; The thick 0.1mm of blank sheet of paper; White light LEDs: 3W warm white.

Data from two embodiment show, adopt the effect optimum of blue-light LED chip and 30 ° of lens combinations.

More than that preferred embodiments of the present utility model is illustrated, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent modifications or replacement under the prerequisite without prejudice to the utility model spirit, and the modification that these are equal to or replacement are all included in the application's claim limited range.

Claims

1. a fluorescence LED device, it comprises light diffusion lampshade (6), rare-earth fluorescent resin sheet (5), LED collector lens (2), LED chip (3) and Combined type reflection cup (1), it is characterized in that: described Combined type reflection cup (1) comprises outside reflector (12) and inner reflector (11), described inner reflector (11) back-off shape and outside reflector (12) combination, after the cup bottom opening place of inner reflector (11) and rare-earth fluorescent resin sheet (5) combination, form the first confined space, described LED collector lens (2) and LED chip (3) are positioned at the first confined space, described LED chip (3) is in LED collector lens (2) below, outside reflector (12) top, the second confined space that outside reflector (12) forms after being closely connected with light diffusion lampshade (6), described the first confined space is positioned at the second confined space.

2. fluorescence LED device according to claim 1, is characterized in that: described light diffusion lampshade (6) can be circular arc or sheet.

3. fluorescence LED device according to claim 1 and 2, is characterized in that: described light diffusion lampshade (6) is the light-passing plastic of striped or frosted.

4. fluorescence LED device according to claim 3, is characterized in that: described light diffusing agent is esters of acrylic acid light diffusing agent or silicone based light diffusing agent.

5. fluorescence LED device according to claim 1, is characterized in that: the scope of the rising angle of described LED collector lens (2) is 5 ~ 30 °.

6. fluorescence LED device according to claim 1, is characterized in that: described LED chip (3) is for emission wavelength is at single high-power blue-ray LED or several the great power LED modules that small-power blue-ray LED is packaged into of 450 ~ 470nm.

7. fluorescence LED device according to claim 1 and 2, it is characterized in that: described Combined type reflection cup (1) adopts aluminize metal reflective cup or the plastics reflector of aluminizing, and described outside reflector (12) and LED chip (3) are arranged on aluminum base PCB plate (4).

8. fluorescence LED device according to claim 1 and 2, is characterized in that: between described light diffusion lampshade (6) and rare-earth fluorescent resin sheet (5), have 0.2 ~ 5cm gap; Between described rare-earth fluorescent resin sheet (5) and LED chip (3), there is 0.2 ~ 5cm gap; The thickness of described rare-earth fluorescent resin sheet (5) is between 0.1 ~ 5mm.