CN101649990A

CN101649990A - Lens for LED street lamp

Info

Publication number: CN101649990A
Application number: CN200810131033A
Authority: CN
Inventors: 陈必寿; 王鹰华; 顾肖冬; 陆平; 叶烨
Original assignee: Shanghai Sansi Technology Co Ltd
Current assignee: Shanghai Sansi Technology Co Ltd; Shanghai Sansi Electronic Engineering Co Ltd
Priority date: 2008-08-16
Filing date: 2008-08-16
Publication date: 2010-02-17

Abstract

The invention provides a lens for an LED street lamp. The lens comprises a planar mounting bottom surface, the middle part of the planar mounting bottom surface is provided with a concave pit in whichan LED is arranged, and the inner surface of the concave pit forms an incident surface of the lens; the lens also comprises an outer surface for forming a ray emergent surface; the outer surface of the lens is provided with a groove with a wide opening and a narrow bottom, the groove is extended to the side edge of the mounting bottom surface from the top part of the outer surface to the lower part of the lateral surface, the shapes of the lens are in bilateral symmetry distribution at two sides of the groove, and the inner surface of the groove forms a part of the emergent surface; and the shape of the emergent surface of the lens can be set into a curved surface, a plane or a combination of a curved surface and a plane according to requirements. After the structure is adopted, the directions of transmitted rays can be reasonably oriented, the distances of the rays irradiated along the road direction (called as horizontal direction) are enlarged, and the illumination is evener.

Description

The lens that a kind of LED street lamp is used

Technical field

The present invention relates to the LED lighting field, the lens that the particularly a kind of LED of being used for street lamp is used.

Background technology

Along with led light source substitutes conventional light source gradually, the advantage of LED lighting day by day is familiar with by people, such as LED being used for the road lighting field, can bring many superiority such as improving light efficiency, energy-saving and environmental protection.

But the hot spot that present most LED street lamps are radiated on the road surface is circular, need greatly differ from each other along the actual conditions of uniform irradiation on the direction of road surface with road.Perfect condition should be: sprawl as far as possible along the road direction glazed thread, and can be controlled effectively perpendicular to the road direction glazed thread, with the uniformity of raising road illumination, thereby make the driver that better visual condition be arranged, reduce the traffic accident incidence, can also reduce the waste of luminous energy.

The Chinese invention patent publication number is among the CN101105272 (open day is on January 16th, 2008), the lens that a kind of LED street lamp is used are disclosed, it adopts a kind of exit facet middle part to protrude and be the lens of pillow-like for arc, make that the hot spot of LED street lamp is rectangular, satisfy the needs of road local lighting, and reduced light losing.

Summary of the invention

Technical problem to be solved by this invention is: the lens of taking the LED street lamp of another kind of new version to use, and make that the hot spot that is incident upon on the road is a strip, and make the illumination of light more even, satisfy the needs of road lighting.

For solving the problems of the technologies described above, the invention provides the lens that a kind of LED street lamp is used, described lens comprise that planar shaped installs the bottom surface, are provided with at the middle part of described installation bottom surface for LED and are installed on pit in it, the inner surface of this pit constitutes the plane of incidence of lens; Also comprise: the outer surface that forms the beam projecting face; Have the narrow groove in the wide end of a Tiaokou on described lens outer surface, described groove extends to installation bottom surface side edge from the outer surface top to the below, side, and lens shape is symmetrical distribution in the both sides of this groove, the part of the inner surface formation exit facet of groove; Described lens exit facet shape can be set to curved surface, plane or curved surface as required and combine with the plane.

After adopting said structure, because the groove that extends to the bottom surface side edge from the outer surface top to the below, side that has on the lens, its shape with exit facet, the plane of incidence combines, can carry out reasonable direction to the transmitted ray direction, allow light effectively utilizing the zone, promptly widen as far as possible along the distance of shining on the road direction.

As further improvement of the present invention, to be the plane of reference through the optical axis of mounted LEDs in the pit and perpendicular to lens installation bottom surface, the plane of while perpendicular to the groove plane of symmetry, this lens shape is asymmetric distribution.

For the light on the vertical road direction is controlled effectively, can adopt the low-angle method that tilts a little between street lamp and road surface that allows when installing usually, but because the restriction at angle of inclination only often is difficult to the effect that reaches more satisfactory in this way.Therefore, this patent has adopted above-mentioned further improved structure, by the design to the lens asymmetric faces, can effectively control the illuminance uniformity of light on vertical road direction, to adapt to demand widely.

In sum, because the lens that the LED street lamp that the present invention adopts is used, the light spot shape that is incident upon on the road surface is become strip by circle, improved along the uniformity of illumination on the road direction, solved " zebra stripes " problem of conventional road lamp, reduce the light flash phenomenon, eliminated the blind area of shining between the adjacent street lamp, improved security when allowing driver and pedestrian feel more comfortable again.And owing to elongated, thereby make that on the road of equal length the quantity of mounted LEDs street lamp reduces, and has also played energy-conservation effect along the light distance on the road direction.

Description of drawings

The present invention will be further described in detail below in conjunction with drawings and Examples:

Fig. 1 is the lens schematic diagram of first embodiment of the invention;

Fig. 2 is the front view of lens shown in Figure 1;

Fig. 3 is the side view of lens shown in Figure 1;

Fig. 4 is the upward view of lens shown in Figure 1;

Fig. 5 is the lens schematic diagram of second embodiment of the invention;

Fig. 6 is the lens schematic diagram of third embodiment of the invention;

Fig. 7 is the profiles of lens shown in Figure 6 along the A-A cross section;

Fig. 8 is for adopting the hot spot figure of lens lighting of the present invention on the road surface.

The specific embodiment

Fig. 1 comprises the bottom surface 1 that lens are installed to first embodiment of LED street lamp of the present invention shown in Figure 4 with lens, and its middle part is provided with the pit 2 that LED is installed, and the inner surface of this pit constitutes the plane of incidence of lens, and whole lens are butterfly shape.Pit 2 shown in the figure is a hemispherical, can certainly cooperate different LED and light distribution requirements to be designed to other shapes, is the cylindrical etc. of concaved circular cambered surface or convex arc surface as: cylindrical, end face.Also comprise the outer surface that constitutes exit facet among the figure.When lens being cooperated installation with LED, the LED optical axis is positioned at the center of pit.Have the narrow groove 3 in the wide end of a Tiaokou on the outer surface, described groove 3 extends to the bottom surface side edge from the outer surface top to the below, side, and the lens outer surface shape is symmetrical distribution in the both sides of this groove 3, shown in as shown in Figure 2 101 and Fig. 5 102, the inner surface of groove constitutes the part of exit facet, and the exit facet of described lens can be set to the shape that curve form, flat shape or curved surface combine with the plane as required.

In first embodiment of the invention shown in Figure 1, this groove 3 is V-shape, and the inner surface of groove 3 is a flat shape, and the both sides of groove 3 are the shape that plane and curved surface combine.

In second embodiment of the invention shown in Figure 5, the inner surface of groove 3 is a curve form, and all the other exit facets also are aspherical shape, and whole lens are peanut shape half.

In actual applications, the degree of depth of groove 3 can cooperate the shape of the exit facet and the plane of incidence to carry out corresponding setting according to the needs of actual luminous intensity distribution.

Fig. 6 is the lens schematic diagram of third embodiment of the invention, with through the optical axis of mounted LEDs in the pit 1 and perpendicular to the bottom surface, the plane perpendicular to the groove plane of symmetry is the plane of reference simultaneously, is asymmetric distribution with the shaped design of lens.Embodiment three is the variation (or improvement) on embodiment two bases.In Fig. 6,, be the boundary with this plane of reference 100 along in the profile 7 in A-A cross section, the

exit facet

111 and 112 of lens, the plane of

incidence

121 and 122 all is asymmetric distribution.This asymmetric distribution can only be designed to as required: with the above-mentioned plane of reference is the boundary, and the exit facet shape is asymmetric, or only is designed to plane of incidence shape and is asymmetric.

Fig. 8 is the hot spot figure of light irradiation behind the application lens of the present invention, therefrom can clearly see, it is more reasonable that the light of rectangular distribution is applied in the road lighting, and the irradiation distance that elongates makes that also the illumination of light is more even, more saves the energy and lighting apparatus.

Claims

1. lens that the LED street lamp is used comprise:

Planar shaped is installed the bottom surface, is provided with at the middle part of described installation bottom surface for LED and is installed on pit in it, and the inner surface of this pit constitutes the plane of incidence of lens;

Also comprise: the outer surface that forms the beam projecting face;

It is characterized in that: on described lens outer surface, have the narrow groove in the wide end of a Tiaokou, described groove extends to installation bottom surface side edge from the outer surface top to the below, side, and lens shape is symmetrical distribution in the both sides of this groove, and the inner surface of groove constitutes the part of exit facet;

Described lens exit facet shape can be set to curved surface, plane or curved surface as required and combine with the plane.

2. the lens that LED street lamp as claimed in claim 1 is used is characterized in that: described pit shape cooperates the difference of mounted LEDs and the needs of luminous intensity distribution can carry out different distortion.

3. the lens that LED street lamp as claimed in claim 1 is used is characterized in that: described groove matches with the shape of lens outer surface and pit, to adapt to the needs of luminous intensity distribution and assembling.

4. lens of using as claim 1,2 or 3 described LED street lamps is characterized in that:

To be the plane of reference through the optical axis of mounted LEDs in the pit and perpendicular to lens installation bottom surface, the plane of while perpendicular to the groove plane of symmetry, this lens shape is asymmetric distribution.

5. the lens that LED street lamp as claimed in claim 4 is used, it is characterized in that: the asymmetric of described lens is distributed as: with the described plane of reference is the boundary, the exit facet shape is asymmetric, or plane of incidence shape is asymmetric, or exit facet and plane of incidence shape all are asymmetric.