CN201344423Y

CN201344423Y - Street lamp adopting LEDs as light sources

Info

Publication number: CN201344423Y
Application number: CNU2009200681106U
Authority: CN
Inventors: 刘木清; 张万路; 李文宜; 韩凯
Original assignee: Fudan University
Current assignee: Fudan University
Priority date: 2009-02-26
Filing date: 2009-02-26
Publication date: 2009-11-11
Anticipated expiration: 2019-02-26

Abstract

The utility model belongs to the technical field of illuminating equipment, in particular to a street lamp adopting light emitting diodes (LEDs) as light sources. The street lamp comprises optical groups with fly-eye lenses, aluminium base PCB boards, lamp housings and LED light sources; the aluminium base PCB boards are fixed above the lamp housings; the LED light sources are welded above the aluminium base PCB boards; an optical group with fly-eye lens is arranged on the front surface of each LED lamp source; a dentate cooling fin is arranged at the bottom of each lamp housing; and the direction of the cooling fin is the same as the running direction on the street. The utility model adopts high-power white-light LEDs as the power sources of the street lamp; on the basis of completely understanding all unique advantages of the LED light source compared with the traditional light source, a combined method of adding lenses on the front surface of each LED and adjusting inclination angles of the lamp is adopted, so that the lamp achieves necessary light distribution requirements for lighting the street; on the aspect of heat radiation, in order to improve the radiation efficiency as possible on the premise of not adding the weight of the lamp, the LEDs adopt a non-uniform distribution manner; and the LEDs on a single PCB board are distributed in a non-uniform manner, so that the junction temperature of the lamp is controlled below the safe temperature.

Description

A kind of street lamp that adopts LED as light source

Technical field

The utility model belongs to the illuminator technical field, is specifically related to the street lamp of a kind of LED of employing as light source.

Background technology

Along with the continuous progress of LED manufacturing technology, its light efficiency improves constantly, and by the end of at present, the light efficiency of laboratory large power white light LED has surpassed 190lm/W, and the light efficiency of matured product has also reached 90lm/W on the market.This light efficiency value has represented the potentiality of LED in the road lighting field.

Compare with conventional light source, LED have again a lot of uniquenesses a bit, imitate such as luminous point, be easy to carry out optical design, and Luminaire efficiency can do very highly, therefore compare and have huge energy-saving potential with conventional light source.In addition, the LED life-span is long, and shock resistance is good, the colour rendering index height, and these characteristics all make LED in road lighting is used advantageous advantage be arranged.Yet also have now some LED street lamps to occur on the market, but do not have fully to understand the characteristic of LED and the advantage of excavating LED during the design of these street lamps, all there is very big problem in the control aspect of design aspect luminous intensity distribution and junction temperature.

The utility model content

The purpose of this utility model is to provide the street lamp of a kind of LED of employing as light source.The light that LED sends forms rectangular light spot by fly's-eye lens, passes through rational luminous intensity distribution again, makes light fixture satisfy the road lighting requirement.By accurate heat dissipation design, the LED junction temperature is controlled within the reasonable range.

The employing LED that the utility model proposes is as the street lamp of light source, comprise fly's-eye lens optics group 1, aluminum base PCB plate 2 lamp outer casings 3 and led light source 5, aluminum base PCB plate 2 is fixed in lamp outer casing 3 tops, led light source 5 is welded on aluminum base PCB plate 2 tops, every LEDs light source 5 fronts are equipped with fly's-eye lens optics group 1, the bottom of lamp outer casing 3 is provided with the fin 4 of dentation, and fin 4 directions are identical with the terrain vehicle line direction.

In the utility model, fly's-eye lens optics group 1 is made up of aspheric fly's-eye lens 6, aspheric surface collimation lens 7 and quadratic surface reflector 8, the light-emitting window of quadratic surface reaction light cup 8 is by aiming at the light inlet of aspheric surface collimation lens 7, and the light-emitting window of aspheric surface collimation lens 7 is aimed at the light inlet of aspheric fly's-eye lens 6.

In the utility model, aluminum base PCB plate 2 is five, middle aluminum base PCB plate 2 is parallel with horizontal plane, other four aluminum base PCB plates 2 are the center with middle aluminum base PCB plate 2, be symmetrically distributed, two aluminum base PCB plates 2 of aluminum base PCB plate 2 both sides are 30 ° with the angle of a middle aluminum base PCB plate 2 in the middle of being positioned at, and remaining two aluminum base PCB plates 2 are 48 ° with the angle of a middle aluminum base PCB plate 2.

In the utility model, the led light source 5 on same block of aluminum base PCB plate 2 is that unequal-interval distributes.

Because the LED street lamp that occurs does not have the optical design of science mostly in the market, cause actual illuminating effect very poor, the uniformity is very poor on the road, and the zebra effect is very serious.Therefore can not reach the requirement of street lighting roads light on the luminous intensity distribution, and Luminaire efficiency is also very low, does not reach energy-conservation effect at all.The mode that the utility model adopts lens and inclination angle to combine, the first hot spot that changes into a rectangle that LED is sent by the lens of front, different angles again tilts different rows' LED, make different rows' LED be responsible for the interior illuminations in zone different on the road surface, so just make that the illumination on road surface is very even, satisfy the light distribution requirements of road lighting, and improve the utilization rate of light fixture greatly, effectively energy savings.Power of the present utility model is 85W, and the high-pressure mercury lamp utilization that can replace traditional 150W fully therefore can be energy-conservation more than 40% on subsidiary road.

The utility model is the photoelectric characteristic of led light source itself to be done design its driving, heat radiation and optics luminous intensity distribution on the abundant testing research basis.Aspect optical design, for realizing even illumination, this novel employing fly's-eye lens optics group is carried out secondary light-distribution to light source, adopts the base inclination angle that light is distributed and carries out three adjustment.This kind way of realization has guaranteed high light utilization efficiency again when realizing evenly illumination.Aspect heat dissipation design, this is novel determines rational heat sink sizes in conjunction with calorifics theory and make the result that the model actual measurement is come out, and considers road overdraught direction and garage simultaneously in the same way, determines that with this fin direction also is the road bearing of trend.In addition, find in test that to the equally distributed aluminum base PCB plate of LED, after it was thermally-stabilised, the temperature of center LED was than the high 7-8 of the temperature on the limit degree centigrade to sample.Therefore in order to improve radiating efficiency as far as possible, on the arranging of LED, we adopt the mode of non-homogeneous cloth lamp, spacing between adjacent two LEDs, successively decrease to both sides from the center, thereby not only reduce center LED and two-terminal led between the temperature difference, also reduced the mean temperature of plank integral body, improved radiating efficiency.Simultaneously, on the arranging of aluminum base PCB plate, we also take the mode of non-homogeneous cloth lamp.

The utility model has following characteristics:

1, adopt large power white light LED to do light source.

2, every LEDs correspondence fly's-eye lens optics group independently obtains uniform rectangular illumination zone on the road surface, guarantees high Luminaire efficiency and light utilization efficiency.

3, realize three luminous intensity distributions by the inclination angle of pcb board between in twos, the inclination angle between five PCB and the road surface has nothing in common with each other, and makes different row LED be responsible for the illumination in the zones of different on the road surface, helps to improve the road surface uniformity.

4, the distribution of aluminum base PCB onboard led is not even distribution, and the spacing between any two adjacent LED all is different, and this spacing reduces successively from the center to both sides.

5, the fin of lamp outer casing is arranged along the direction on road.

Description of drawings

Fig. 1 is a structural diagrams of the present utility model.

Fig. 2 is the structural diagrams of aluminum base PCB plate 2.

Fig. 3 is the structural diagrams of led light source 5 and compound eye transmissive optical lens group 1.

Number in the figure: 1 compound eye optical lens group, 2 is the aluminum base PCB plate, 3 lamp base, 4 is fin, and 5 is led light source, and 6 is aspheric fly's-eye lens, and 7 is the aspheric surface collimation lens, 8 is the quadratic surface reflector.

The specific embodiment

Further specify the utility model in conjunction with the accompanying drawings below by embodiment.

Embodiment 1: device comprises fly's-eye lens optics group 1, aluminum base PCB plate 2 lamp outer casings 3 and led light source 5, aluminum base PCB plate 2 is fixed in lamp outer casing 3 tops by thermally conductive grease and screw, led light source 5 is welded on aluminum base PCB plate 2 tops, every LEDs light source 5 fronts are equipped with fly's-eye lens optics group 1, the bottom of lamp outer casing 3 is provided with the fin 4 of dentation, and fin 4 directions are identical with the terrain vehicle line direction.Fly's-eye lens optics group 1 is made up of aspheric fly's-eye lens 6, aspheric surface collimation lens 7 and quadratic surface reflector 8, the light-emitting window of quadratic surface reaction light cup 8 is by aiming at the light inlet of aspheric surface collimation lens 7, and the light-emitting window of aspheric surface collimation lens 7 is aimed at the light inlet of aspheric fly's-eye lens 6.

1, shared 70 large power white light LEDs of the utility model are divided into 5 rows, and 14 of every rows are welded on the aluminum base PCB plate, 5 aluminum base PCB plates totally.

2, corresponding fly's-eye lens optics group of every LEDs, the optics group is glued on the relevant position of aluminum base PCB plate.

3, the aluminum base PCB plate is fixed on the lamp housing at certain inclination angle with screw.

The utility model can be applicable on the subsidiary road of the two-way Four-Lane Road that needs illumination.Work is divided into installs and uses two steps.

The utility model is to be fixed on the lamp stand by rear end sleeve and setscrew, and the visual use of setting height(from bottom) and setting angle needs to adjust.

In the use, the utility model is a kind of tunnel illumination light fixture that is operated under the civil power.The lamp power line directly is connected with driver, and driver is directly driven by the 220V civil power, can descend often to light.

Light path during this is novel is as follows:

Large power white light LED is as light source, and the light that sends has the distribution of approximate lambert's form in the space.After the light that light source sends is modulated by central collimation lens and paraboloid, form the inner surface that a branch of collimated light beam that is parallel to primary optical axis incides fly's-eye lens, each the lenticule unit on the fly's-eye lens is that 26 ° light beam penetrates to the road surface with the directional light of incident modulation becoming shooting angle.

Claims

1. street lamp that adopts LED as light source, comprise fly's-eye lens optics group (1), aluminum base PCB plate (2) lamp outer casing (3) and led light source (5), it is characterized in that aluminum base PCB plate (2) is fixed in lamp outer casing (3) top, led light source (5) is welded on aluminum base PCB plate (2) top, every LEDs light source (5) front is equipped with fly's-eye lens optics group (1), the bottom of lamp outer casing (3) is provided with the fin (4) of dentation, and fin (4) direction is identical with the terrain vehicle line direction.

2. employing LED according to claim 1 is as the street lamp of light source, it is characterized in that fly's-eye lens optics group (1) is made up of aspheric fly's-eye lens (6), aspheric surface collimation lens (7) and quadratic surface reflector (8), the light-emitting window of quadratic surface reaction light cup (8) is by aiming at the light inlet of aspheric surface collimation lens (7), and the light-emitting window of aspheric surface collimation lens (7) is aimed at the light inlet of aspheric fly's-eye lens (6).

3. employing LED according to claim 1 is as the street lamp of light source, it is characterized in that aluminum base PCB plate (2) is five, a middle aluminum base PCB plate (2) is parallel with horizontal plane, other four aluminum base PCB plates (2) are the center with a middle aluminum base PCB plate (2), be symmetrically distributed, two aluminum base PCB plates (2) of an aluminum base PCB plate (2) both sides are 30 ° with the angle of a middle aluminum base PCB plate (2) in the middle of being positioned at, and remaining two aluminum base PCB plates (2) are 48 ° with the angle of a middle aluminum base PCB plate (2).

4. employing LED according to claim 1 is characterized in that as the street lamp of light source the led light source (5) on the same block of aluminum base PCB plate (2) distributes for unequal-interval.