CN100476289C - An LED street lamp device forming a rectangular light spot - Google Patents

Abstract

The invention relates to a LED street lamp device, belonging to the field of lighting equipment. The road lighting is one of the important constituent parts of city infrastructure. With the increasing of perception of environmental protection, environmentally friendly lighting fixtures will be a hop topic. The invention provides a LED street lamp device capable of forming rectangular light spot. In the device, the LED modules 1-50 are arranged in the lighting fixture in group; the optical device is composed of an aspheric central collimating lens, a parabolic reflecting cup and an aspheric microlens array; and the LED light source is arranged at the bottom of the reflecting cup, and the aspheric microlens array is disposed perpendicular to the optical axis. Adjusting the position of aspheric central collimating lens and aspheric microlens array in the parabolic reflecting cup and the elevation angle of LED to make the light from LED parallelly emitted, and finally a rectangular light spot with uniform illumination intensity is formed on an objective illumination surface.

Description

An LED street lamp device forming a rectangular light spot

technical field

The invention belongs to the field of lighting equipment and relates to an LED street lamp device.

Background technique

Road lighting is one of the important components of urban infrastructure. It plays an important role in traffic safety and social security. At the same time, it can also beautify the city appearance and decorate the environment, making each city have its own style. Recently, the state has paid more and more attention to environmental protection. From the president of the country to leaders at all levels of districts and counties, the focus of work has shifted to the control of environmental pollution. "Green GDP" has also become a hot topic in daily life. As an important part of infrastructure, road lighting inevitably becomes the goal of energy saving and emission reduction. At present, fluorescent lamps, high-pressure mercury lamps and high-pressure sodium lamps are widely used. Although they have good luminous performance, they have problems such as short service life and easy mercury pollution. Therefore, with the "Eleventh Five-Year" Urban Green Lighting Project With the promulgation of the "Planning Outline", environmental lighting will become a hot topic.

Contents of the invention

The object of the present invention is to provide a street lamp device with excellent environmental performance and luminous performance.

With the continuous improvement of LED (light-emitting diode) manufacturing technology, its luminous efficacy continues to rise. Up to now, the luminous efficacy of high-power white LEDs has reached 100lm/w, and the luminous efficacy of stable products is also 80lm/w. This luminous efficacy value demonstrates the potential of LEDs for practical general lighting applications. Coupled with the characteristics of LEDs such as long life, good shock resistance, small size similar to point light sources, and simple driving, LEDs are undoubtedly far more competitive than high-pressure sodium lamps in the field of road lighting.

Table 1 Performance comparison between LED and various common lighting sources

There are four core advantages that support LED to become the best road lighting source:

(1) Through the study of the LED light-emitting mechanism, it can be calculated that the potential luminous efficacy of the LED can reach 350lm/w. Considering the limitations of the process, the actual LED luminous efficacy is expected to reach 200lm/w. From the perspective of the light source alone, LED is undoubtedly the light source with the highest light efficiency in the future, in other words, the most energy-saving light source.

(2) Compared with traditional light sources, LEDs are small in size, and can even be treated as point light sources in many applications, which brings great convenience to the optical design of lamps. At the same time, the use of large-size traditional light source lamps The shading and absorption effects of the light source that appear do not exist anymore.

(3) LED only emits light to the half space, which means that without adding any form of reflector, the light emitted by the light source can also be directed to the direction of the illuminated surface. In this way, the calculation of the lamp efficiency of LED lamps is different from that of traditional light source lamps , No need to discount anymore. This feature determines that LED lamps can fully achieve a luminous flux utilization rate of more than 90%.

(4) Under the lighting brightness environment of the road at night (road surface illuminance 1-2lx), the human eye is in the state of intermediate vision. At this time, the white light emitted by the white LED with the same brightness is higher than the yellow light emitted by the high-pressure sodium lamp. Visual stimulation. That is, from the human point of view, the lighting environment of white light is brighter than that of yellow light. This theory of intermediate vision supports the application of white LED instead of yellow sodium lamp. Under the premise of ensuring the same road lighting level , the brightness of white light will be lower than that of yellow light, which adds another weight to the advantages of LED in lighting energy saving.

The invention provides an LED street lamp device forming a rectangular light spot. In this device, 1-50 LED modules with optical devices are installed in a group in the lamp; the optical device is composed of an aspheric central collimating lens, a parabolic reflector and an aspheric micro-lens array; the LED light source is installed in the At the bottom of the reflective cup, the aspheric microlens array is placed perpendicular to the optical axis, and the position of the aspheric central collimator lens and the aspheric microlens array in the parabolic reflective cup and the elevation angle of the LED are adjusted to make the light of the LED exit in parallel.

In the present invention, the positions of the aspherical central collimating lens and the aspheric microlens array in the parabolic reflective cup and the elevation angle of the LED can be adjusted mutually according to the size of the reflective cup and the height of the street lamp, so that the light of the LED is emitted in parallel, The lighting surface forms a rectangular bright spot with uniform illuminance, which meets the road illuminance required by the national road lighting standard.

In the present invention, the LED modules are installed in groups on the lamp base.

In the present invention, 1-10 LED modules form a group.

In the present invention, the aspheric microlens array is 2-100 aspheric microlenses.

The invention provides a secondary optical design structure based on high-power light-emitting diodes (LEDs). Its main features are:

(1) Each LED corresponds to a separate optical system, and the specific optical system is composed of a collimation system and a diverging lens. The light emitted by the LED is adjusted by the collimation system to be parallel to the optical axis of the system, and then diverges at a certain angle through the aspheric diverging lens.

(2) After passing through the optical system, the light emitted by the LED finally forms a rectangular bright spot with uniform illumination on the target lighting surface.

(3) The LED modules with optical system are grouped into a group and installed in a specific lamp, and the elevation angle of each group of LEDs is adjusted to form a whole lamp.

The invention provides a secondary optical design structure based on high-power light-emitting diodes (LEDs). Each LED corresponds to a separate optical system. The specific optical system is composed of a collimator system and a divergent lens. The light emitted by the LED is adjusted to be parallel to the optical axis of the system through the collimator system, and then passes through the aspheric divergent lens. Diverge at a certain angle, and finally form a rectangular bright spot with uniform illumination on the target lighting surface. This kind of LED module with optical system is grouped into a group, installed in a specific lamp in groups, and the elevation angle of each group of LEDs is adjusted to finally obtain the road surface illumination that meets the requirements of the national road lighting standard. In addition, the LED light source has good luminous performance and no pollution, and the lighting device of the present invention can be widely used in various roads and public places.

Description of drawings

Fig. 1 is a schematic structural diagram of an LED module with an optical device. Among them, 1 is a parabolic reflector cup, 2 is an aspheric microstructure array, 3 is a central aspheric collimating lens, 6 is an LED light source, and 7 is an optical axis.

Fig. 2 is a schematic diagram of the structure of a street lamp with LED module groups (35 pieces) at the bottom of the lamp, which are installed parabolicly facing the ground to increase the luminous area. Among them, 4 is a single LED module, and 5 is a lamp base.

Detailed ways

The used elements of the present invention are as follows:

Central aspherical lens: refracts the light near the main optical axis of the LED into a light parallel to the main optical axis.

Parabolic reflector: reflect the large-angle light emitted by the LED into parallel light.

Aspheric Microstructure Array: An array of dozens of square aspheric lenses refracts the light from the central aspheric lens and parabolic reflector to control the divergence angle of the outgoing light.

LED module group: LED modules with an optical system are grouped into a group and installed in a specific lamp, and the elevation angle of each group of LEDs is adjusted to finally obtain road illumination that meets the requirements of the national road lighting standard.

Instrument assembly process:

Assemble according to Figure 1, install the high-power LED on the bottom of the reflective cup, install the central aspheric collimating lens and aspheric microlens array in turn in the reflective cup, the central aspheric collimating lens and aspheric microlens array vertical light axis placement.

A group of LED modules with an optical system is installed on the base of the lamp to adjust the elevation angle of each group of LEDs.

After installation, turn on the power to illuminate.

Claims (4)

1. An LED street light device forming a rectangular spot, characterized in that 1-50 LED modules with optical devices are a group, and are installed in groups in the lamp; the optical device consists of an aspheric central collimating lens and a parabolic reflector Composed of an aspheric microlens array; the LED light source is installed at the bottom of the reflective cup, and the aspheric microlens array is placed vertically to the optical axis to adjust the position of the aspheric central collimator lens and the aspheric microlens array in the parabolic reflective cup and the elevation angle of the LED , so that the light of the LED exits in parallel. 2. The street lamp device according to claim 1, wherein the LED modules are installed in groups on the base of the lamp. 3. The street light device according to claim 1, characterized in that 1-10 LED modules form a group. 4. The street light device according to claim 1, wherein the aspheric microlens array is 2-100 aspheric microlenses.

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