CN203242666U

CN203242666U - Led device

Info

Publication number: CN203242666U
Application number: CN 201320223922
Authority: CN
Inventors: 曹红曲
Original assignee: CHENGDU OUSHENG PHOTOELECTRIC TECHNOLOGY Co Ltd
Current assignee: CHENGDU OUSHENG PHOTOELECTRIC TECHNOLOGY Co Ltd
Priority date: 2013-04-27
Filing date: 2013-04-27
Publication date: 2013-10-16
Anticipated expiration: 2023-04-27

Abstract

The utility model relates to an LED device. The to-be-solved technical problem of the utility model is to provide the LED device which enables the luminous flux to be improved substantially, the blue light proportion in an emergent light beam to be reduced effectively, and a color temperature to be reduced. The employed technical scheme is that the LED device comprises a substrate and LED chips, a fluorescent powder layer is arranged on the LED chips, and a two-way color separating element is arranged on the fluorescent powder layer. The beneficial effects of the utility model are that: by the two-way color separating element, the blue light which is not excited by the fluorescent powder is reflected back, the amount of the blue light excited by the fluorescent powder is improved substantially, the blue light of which the wavelength is shorter is reduced, the emergent light of which the wavelength is longer is increased, the blue light harm can be reduced effectively, the color temperature of an emergent light beam is reduced, at the same time, the luminous flux is improved. The LED device of the utility model is suitable for an LED lighting device.

Description

The LED device

Technical field

The utility model relates to a kind of LED device, specifically relates to a kind of LED device that can increase luminous flux and reduce the blue light exit dose.

Background technology

From the end of the nineties in last century till now, the appearance of white light emitting diode and fast development cause the great enthusiasm of people, white light LEDs has low pressure, low-power consumption, highly reliable, the advantages such as long-life and solidification.Its large attraction of amount and being contemplated to be as the illumination of the 4th generation behind incandescent lamp bulb, fluorescent lamp and high-intensity gas discharge lamp (HID) new light sources---having the light source of huge illumination market and significant Energy-saving Perspective, is the green illumination light source that meets environmental protection, energy-conservation requirement.Therefore, be subject to the attention of national governments and businessman.

Making white light LEDs with the blue-ray LED excitated fluorescent powder is one of method that the most popular and cost is minimum at present, and its structure as shown in Figure 1.Present LED device comprises substrate 21 and led chip 22, and the outgoing beam of this led chip 22 is blue light, is provided with the encapsulation glue-line 23 that contains fluorescent material above led chip 22.But owing to will luminous energy be discharged, between the fluorescent powder grain enough gaps must be arranged, to allow energy transmissive out; The gap also so that quite a few blue light just excites without fluorescent material casts out, becomes cold light but simultaneously.This problem in the LED of high color temperature by for outstanding.Although, in the world the harmfulness of blue light also there is not consensus, there is the result of study of a lot of mechanisms to show that all too much blue light is harmful to human body.In traditional LED device, need to add more fluorescent material to reduce overflowing of blue light, to reduce the blue light ratio, the fail safe that improves light source.Yet this device has not only reduced light extraction efficiency, has also increased packaging cost simultaneously.In addition, the LED device of prior art in order to reduce blue light, to reduce colour temperature so that luminous flux is lower, do not utilize efficiently the energy of outgoing beam.

The utility model content

Technical problem to be solved in the utility model provides a kind of LED device, and this device can significantly improve luminous flux, and effectively reduces the ratio of blue light in the outgoing beam, reduces colour temperature.

The technical scheme that its technical problem that solves the utility model adopts is: the LED device, comprise substrate and led chip, and above described led chip, be provided with the encapsulation glue-line that contains fluorescent material, be provided with two to recombination dichroic elements on the described encapsulation glue-line that contains fluorescent material.This is two to recombination dichroic elements reflect blue and transmission long wavelength light.Two can be used for isolating the visible spectrum of particular range to recombination dichroic elements, and the beam reflection of this particular range is gone back, and the light beam of other scopes then can pass through this element smoothly.

Concrete, described two is that the plane of incidence is coated with two lens to dichroic coating to recombination dichroic elements.Lens have the plane of incidence and exit facet, are coated with two on the plane of incidence to dichroic coating, can be so that blue light when being reflected back, and long wavelength light beam is gone out by the exit facet transmission.

Further, described two to dichroic coating for for multilayer dielectric film.

Concrete, described lens are provided with the packaging plastic interlayer that contains fluorescent material and are connected glue-line.

Preferably, described lens are free-form surface lens.

Preferably, described lens are lens curve.

Further, the sidewall of the plane of incidence of lens is provided with the plane.

Further, the sidewall of the exiting surface of described lens is provided with the plane.

The beneficial effects of the utility model are: by two to recombination dichroic elements, so that the blue light that excites without fluorescent material is reflected back, so that the amount of the blue light that excites by fluorescent material improves greatly, thereby significantly increase light beam output, significantly improve luminous flux, reduce the shorter blue light of wavelength, increase the long emergent light of wavelength, can effectively reduce the harm of blue light, reduce the colour temperature of outgoing beam.The utility model is applicable to the LED lighting device.

Description of drawings

Fig. 1 is the structural representation of the LED device of prior art;

Fig. 2 is the structural representation of LED device of the present utility model;

Fig. 3 be the inner lens surfaces in the LED device of the present utility model plate two to dichroic coating based on different wave length light beam reflectance curve;

Wherein, 21 is substrate, and 22 is led chip, and 23 for containing the encapsulation glue-line of fluorescent material, and 24 is lens, and 25 is the plane of incidence, and 26 is exit facet, and 27 for connecting glue-line.

Embodiment

Below in conjunction with accompanying drawing, describe the technical scheme of utility model in detail.

As shown in Figure 2, LED device of the present utility model, comprise substrate 21 and led chip 22, above described led chip 22, be provided with the encapsulation glue-line 23 that contains fluorescent material, be provided with the plane of incidence 25 on the described encapsulation glue-line 23 that contains fluorescent material and be coated with two lens 24 to dichroic coating.These lens 24 can the usable reflection blue light and transmission long wavelength's light beam, and the blu-ray reflection that will overflow goes back, and makes it by the exciting of fluorescent material, and the light beam that converts the long wavelength to is gone out by exit facet 26 transmissions; Thereby significantly increase light beam output, strengthen luminous flux, reduce colour temperature, reduce the harm of blue light.

Lens 24 are provided with the packaging plastic interlayer that contains fluorescent material and are connected glue-line 27, reflectivity that can the Effective Raise blue light.

Two to the typical deposition curve of dichroic coating as shown in Figure 3, and as can be seen from the figure, when light beam wavelength during less than 450nm, this film system is higher to the reflectivity of light beam, and the light beam of transmission is less; When the light beam wavelength value is 500nm when above, less than 20%, most of light beam transmission is gone out to the reflectivity of light beam in this film system; The light beam wavelength value is 550nm when above, and this film system is 0 to the reflectivity of light beam substantially, and light beam basically transmission is gone out.

The plane of incidence 25 is coated with two materials to the lens 24 of dichroic coating and is generally PC, and size can be along with the dimensional requirement customization of led chip.Optics PC lens are because shock resistance is generally used for the optical design of outdoor LED street lamp lens.In addition also available optics silica-gel lens, the lens of the type are high temperature resistant, are generally used for the once encapsulation of LED, also can be used for the secondary mixed light.Perhaps utilize optics PMMA lens, the light transmission injection moulding of the lens of the type is better, and the cost of raw material is also lower.

Two is that multilayer dielectric film vacuum coating forms to dichroic coating, can effectively reduce the uptake to beam energy.

Lens 24 are lens curve, can be so that the direction of outgoing beam is comparatively even.The sidewall of the plane of incidence 25 of lens 24 is provided with the plane, is convenient to be installed on the substrate 21.

For the ease of mounted lens, the sidewall of the exiting surface 26 of lens 24 is provided with the plane.

After the light beam that led chip 22 sends incided on the lens 24 by phosphor powder layer 23, blue light was reflected back, and again was excited after entering phosphor powder layer 23; Excited the long wavelength light beam of formation then to be transmitted out by fluorescent material.

Claims

1.LED device comprises substrate (21) and led chip (22), is provided with the encapsulation glue-line (23) that contains fluorescent material in the top of described led chip (22), it is characterized in that, is provided with two to recombination dichroic elements on the described encapsulation glue-line (23) that contains fluorescent material.

2. LED device as claimed in claim 1 is characterized in that, described two is that the plane of incidence (25) is coated with two lens to dichroic coating (24) to recombination dichroic elements.

3. LED device as claimed in claim 2 is characterized in that, described two is multilayer dielectric film to dichroic coating.

4. LED device as claimed in claim 2 or claim 3 is characterized in that, is provided with between described lens (24) and the encapsulation glue-line (23) that contains fluorescent material to be connected glue-line (27).

5. LED device as claimed in claim 4 is characterized in that, described lens (24) are free-form surface lens.

6. LED device as claimed in claim 5 is characterized in that, described lens (24) are lens curve.

7. LED device as claimed in claim 5 is characterized in that, the sidewall of the plane of incidence (25) of described lens (24) is provided with the plane.

8. LED device as claimed in claim 5 is characterized in that, the sidewall of the exiting surface (26) of described lens (24) is provided with the plane.