CN101761799A

CN101761799A - LED lamp

Info

Publication number: CN101761799A
Application number: CN200910108026A
Authority: CN
Inventors: 周明杰; 刘廷明
Original assignee: Oceans King Lighting Science and Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Current assignee: Oceans King Lighting Science and Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Priority date: 2009-06-05
Filing date: 2009-06-05
Publication date: 2010-06-30
Anticipated expiration: 2029-06-05
Also published as: CN101761799B

Abstract

The present invention provides an LED lamp which belongs to lighting field. The LED lamp comprises an LED light source, a first light reflector, a second light reflector and an adjusting component, wherein the LED light source is fixedly arranged at the focal point of the first light reflector, the focal distance of the second light reflector is larger than that of the first light reflector, and the adjusting component can control the LED light source to move with the first light reflector along the axis of the second light reflector. When the adjusting component controls the LED light source to move to the focal point of the second light reflector, spotlight effect is achieved; and when the adjusting component controls the LED light source to move away from the focal point of the second light reflector, floodlight effect is achieved. The present invention is characterized in that the LED lamp has a structure of two light reflectors, so the LED lamp can realize the conversion of spotlight and floodlight; and the light reflector with a small focal distance can always supplement light energy to the center of a facula by means of reflection rays, thereby solving the problem of black facula of a traditional single spotlight-floodlight reflector during floodlight, and realizing uniform facula and favorable visual effect.

Description

A kind of LED light fixture

Technical field

The invention belongs to lighting field, relate in particular to a kind of LED light fixture.

Background technology

The luminous efficiency of present high-power adopting surface mounted LED light source improves constantly, LED is applied to flashlight, spotlight lamps such as head lamp are very general, simultaneously, fixedly Flood lamps and lanterns and removable Flood lamps and lanterns are also in continuous progress, but on same light fixture, not only has optically focused but also the floodlight function is arranged, and realize adjustable more rare of hot spot, have only the part producing merchant to make a simple parabola reflective optical system, install the adjustable structure in LED and reflective optical system position then additional and realize that poly--floodlight switches, shown in Figure 1A, this kind optical texture principle is, led light source 1 is placed on the parabolic focus, light parallel outgoing after 2 reflections of parabola reflective optical system from focus is sent realizes spotlight effect, and hot spot effect and light intensity curve are shown in Figure 1B and Fig. 1 C.After led light source 1 leaves the parabola focus (along the central shaft of parabola reflective optical system away from the parabola focus), light reflected is dispersed ejaculation, realizes the floodlight effect, referring to Fig. 2 A, is hot spot design sketch and light intensity curve figure when Fig. 2 B and Fig. 2 C floodlight.

No matter from principle still from simulate effect, this by light source away from the mode of parabola focus realize gathering-that effect is switched in floodlighting is not ideal enough, especially can produce the black hole at the spot center place when floodlight, influence illuminating effect.

Summary of the invention

The purpose of the embodiment of the invention is to provide a kind of LED light fixture, is intended to solve existingly have poly--floodlight to switch light fixture hot spot when switching to floodlight of effect inhomogeneous, and there is the problem in black hole in the center.

The embodiment of the invention is achieved in that a kind of LED light fixture, comprises led light source, also comprises:

First reflective optical system, described led light source is fixedly arranged on its focal position;

Focal length is greater than second reflective optical system of described first reflective optical system; And

Adjustment means can be controlled described led light source and move with the axis of described first reflective optical system along described second reflective optical system;

When described adjustment means is controlled described led light source and moved to the focal position of described second reflective optical system, can realize spotlight effect; When described adjustment means is controlled described led light source away from the focal position of described second reflective optical system, can realize the floodlight effect.

In the embodiment of the invention, the LED light fixture is owing to adopt the structure of two reflective optical systems, can make same LED light fixture realize the switching of optically focused floodlight, simultaneously because the less reflective optical system of focal length always has reflection ray to replenish light energy to spot center, solved the traditional hot spot black hole problem of single poly-floodlight reflective optical system when floodlight, realized that hot spot is even, visual experience is better.

Description of drawings

Figure 1A is the optically focused light path principle figure of poly--LED light fixture that floodlight is adjustable of providing of prior art;

Figure 1B and Fig. 1 C are respectively poly--hot spot design sketch and the light intensity curve schematic diagram of LED light fixture when realizing spotlight effect that floodlight is adjustable that prior art provides;

Fig. 2 A is the floodlight light path principle figure of poly--LED light fixture that floodlight is adjustable of providing of prior art;

Fig. 2 B and Fig. 2 C are respectively poly--hot spot design sketch and the light intensity curve schematic diagram of LED light fixture when realizing the floodlight effect that floodlight is adjustable that prior art provides;

Fig. 3 is the structure principle chart of the LED light fixture that provides of the embodiment of the invention;

Fig. 4 is the optically focused light path principle figure of LED light fixture shown in Figure 3;

Fig. 5 is the hot spot design sketch of LED light fixture shown in Figure 3 when realizing spotlight effect;

Fig. 6 is the light intensity curve schematic diagram of LED light fixture shown in Figure 3 when realizing spotlight effect;

Fig. 7 is the floodlight light path principle figure of LED light fixture shown in Figure 3;

Fig. 8 is the hot spot design sketch of LED light fixture shown in Figure 3 when realizing the floodlight effect.

Fig. 9 is the light intensity curve schematic diagram of LED light fixture shown in Figure 3 when realizing the floodlight effect.

The specific embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

In the embodiment of the invention, the LED light fixture adopts the structure of two-stage reflective optical system and the focal length difference of two-stage reflective optical system, and led light source is fixedly arranged on the focal position of the reflective optical system of less focal length, the reflective optical system that led light source can be followed less focal length moves along the axis direction of the reflective optical system of big focal length.

Fig. 3 shows the structural principle of the LED light fixture that the embodiment of the invention provides, and for convenience of description, only shows part related to the present invention.

With reference to Fig. 3, the LED light fixture comprises led light source 31, first reflective optical system 32, second reflective optical system 33 and adjustment means (not shown), wherein the focal length of first reflective optical system 32 is less than the focal length of second reflective optical system 33, and first reflective optical system 32 has identical axis with second reflective optical system 33, led light source 31 is fixedly arranged on the focal position of first reflective optical system 32, led light source 31 can move forward and backward along axis direction with first reflective optical system, 32 second reflective optical systems 33 under the control of adjustment means, in this adjustment means can have respectively by two, externally threaded assembly constitutes, realize relative displacement by rotation, also can be by two cylinder and cylindrical shell realizations (cylinder is built in the cylindrical shell) of fit each other, wherein has frictional force between cylinder outer wall and the cylinder inboard wall, when no external force applies, can keep static relatively, promptly need external force to promote both and realize relative displacement, other multiple implementations also can be arranged certainly, enumerate no longer one by one.

The bus of above-mentioned two reflective optical systems can be parabola, also can be elliptic curve.Wherein when led light source 31 during for the small size light source (reflector size be dimension of light source more than 10 times the time), preferred use bus is parabolical reflective optical system, because the light that sends at parabola focus place with parallel light emergence, collimates effective after the parabola reflection.And when led light source 31 during for the light source of larger volume (reflector size be in 10 times of dimension of light source time), the preferred reflective optical system of bus that use as elliptic curve, because dimension of light source is big, luminous point does not concentrate on a bit to be gone up but a face, as then retrodeviating from the axis to leaving the light reflection that the axis luminous point sends with paraboloidal reflector, light collimation effect is bad, and the reflector (span of said here oval conic section coefficient C should be-0.9＜C＜-1) of use elliptic curve, the light that the luminous point from axle can be sent converges to a certain extent, the dispersion angle that is reflection ray reduces, and collimates effective.Suitably selecting the focal length size of two reflective optical systems, can make the LED light fixture produce desirable optically focused or floodlight effect, is parabolical application scenarios as the bus for two reflective optical systems, can consider that the bus equation that first reflective optical system 32 is set is: y ²=6x, the bus equation of second reflective optical system 33 is: y ²=13.6x.Can certainly select the shape difference of two reflectors, promptly bus is respectively parabola and elliptic curve.

When adjustment means control led light source 31 moves to the focal position of second reflective optical system 33, can realize spotlight effect, light path principle as shown in Figure 4, as can be seen, light parallel ejaculation after 32 reflections of first reflective optical system that part is penetrated by led light source 31, another part directly arrives second reflective optical system 33 by the light that led light source 31 penetrates without 32 reflections of first reflective optical system, and by the 33 reflection parallel ejaculations in back of second reflective optical system, hot spot effect and light intensity curve are respectively referring to Fig. 5 and Fig. 6.

When led light source 31 and first reflective optical system 32 during gradually away from the focal position of second reflective optical system 33 (moving) to direction near second reflective optical system, 33 openings, light fixture is realized the floodlight effect, light path principle as shown in Figure 7, as can be seen, the still parallel ejaculation after 32 reflections of first reflective optical system of light that part is penetrated by led light source 31, another part directly arrives second reflective optical system 33 by the light that led light source 31 penetrates without 32 reflections of first reflective optical system, by dispersing ejaculation after 33 reflections of second reflective optical system, the hot spot effect as shown in Figure 8, switching to by optically focused in the process of floodlight as can be seen, because 32 pairs of spot center of first reflective optical system always have reflected in parallel light to replenish light energy, spot center does not have the black hole and hot spot is comparatively even in the time of can guaranteeing the light fixture floodlight.Simultaneously led light source 31 away from the process of the focal position of second reflective optical system 33 in the middle of hot spot will become continuously greatly, promptly dispersion angle becomes greatly continuously, light intensity curve is referring to Fig. 9.

In the embodiment of the invention, the LED light fixture is owing to adopt the structure of two reflective optical systems, can make same LED light fixture realize the switching of optically focused floodlight, simultaneously because the less reflective optical system of focal length always has reflection ray to replenish light energy to spot center, solved the traditional hot spot black hole problem of single poly-floodlight reflective optical system when floodlight, realized that hot spot is even, visual experience is better.Simultaneously can also be according to the volume size of led light source, the bus that can select reflective optical system is the shape of parabola or elliptic curve.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1. a LED light fixture comprises led light source, it is characterized in that, also comprises:

2. LED light fixture as claimed in claim 1 is characterized in that, described first reflective optical system and second reflective optical system are coaxial.

3. LED light fixture as claimed in claim 1 or 2 is characterized in that, the bus of described first reflective optical system and/or second reflective optical system is a parabola.

4. LED light fixture as claimed in claim 1 or 2 is characterized in that, the bus of described first reflective optical system and/or second reflective optical system is an elliptic curve.