CN103727466A - LED blackboard lamp capable of achieving uniform lighting - Google Patents

Abstract

The invention relates to LED lamps and blackboard lighting lamps, in particular to an LED blackboard lamp capable of achieving uniform lighting. The LED blackboard lamp capable of achieving uniform lighting comprises a lamp frame, a free curved surface reflecting cover and an LED lamp tube, wherein a free curved surface of the reflecting cover is calculated according to blackboard illumination requirements, a mirror surface reflection film is attached to the surface of the reflecting cover, a light-shield plate (1), the reflecting cover (2), a top plate (3) and an installation plate (7) are machined to form the lamp frame through sheet metal parts, a lamp seat (8) is fixed to an installation inclined plane (71) through installation holes (6), and the LED lamp tube (4) is fixed to the lamp frame through the lamp seat (8). The LED blackboard lamp capable of achieving uniform lighting can solve the problems that an existing blackboard lamp is poor in illumination, distributes light unevenly, has glare and the like, and has the advantages of saving energy, being convenient to maintain and the like.

Description

An LED blackboard lamp for uniform illumination

technical field

The invention relates to the field of LED lamps, in particular to the field of designing an LED blackboard lamp with high efficiency and uniform high illuminance.

technical background

The purpose of classroom blackboard lighting is to provide a good visual light environment to ensure that teachers and students can easily write on the blackboard and read the content on the blackboard. If there are surfaces with very different brightness from each other, the vision is often adapted to changes in brightness. In order to reduce the visual fatigue caused by this, the lighting distribution should have a certain degree of uniformity. Some classrooms use bracket lamps as lighting fixtures. The actual utilization efficiency of the lamps is extremely low, and it will produce a lot of glare; Low and very poor uniformity.

LED is called the fourth-generation light source, which has the characteristics of energy saving, environmental protection, safety, long life, low power consumption, low heat, high brightness, waterproof, miniature, shockproof, easy dimming, concentrated beam, easy maintenance, etc., and can be widely used in Various indications, displays, decorations, backlights, general lighting and other fields. Using the light distribution curve of the Lambertian shape of the LED light source and the illuminance requirements of the blackboard surface, a corresponding free-form reflector can be obtained, thereby forming an LED blackboard lamp that realizes uniform illumination. This LED blackboard light has the characteristics of low energy consumption, high illuminance, high uniformity, and low glare.

After searching the literature of the prior art, it was found that the Chinese invention patent CN200710049769.2 designed a blackboard lamp with double reflectors. Many light rays directly enter the human eye or irradiate the ground, and are reflected to the human eye, resulting in glare and a great waste of energy, and the structure of the lamp is relatively complicated, which is not conducive to practical application.

Contents of the invention

The object of the present invention is to provide an LED blackboard lamp with high illuminance, high uniformity, low cost, and convenient maintenance and use in view of the deficiencies in the prior art.

An LED blackboard lamp for realizing uniform illumination, comprising a lamp stand, a free-form reflector, and an LED lamp tube. The reflective surface type obtained through scientific calculation can make the LED lights form a uniform illuminance on the blackboard while achieving high light energy utilization. A specular reflective film with high reflectivity is pasted on the reflector, which can improve the efficiency of the lamp and reduce the production cost. The mounting plate forms a mounting slope at an angle of 20 degrees to the vertical direction on the side facing the reflector, and there are two mounting holes on the mounting slope for fixing the lamp holder. The LED lamp tube is fixed on the lamp stand through the lamp holder, and its luminous angle is less than 180 degrees. The luminous surface faces the reflector, parallel to the installation slope, and forms an included angle of 20 degrees with the vertical direction. The reflector is fixed between the light baffle and the top plate through sheet metal processing, and a specular reflective film with high reflectivity is pasted on it. The shading plate is connected to the end of the reflector through sheet metal processing, parallel to the top plate, and the width is about 1/2 of the top plate. There are two mounting holes (6) on the lamp board (3), which are used for fixing and hanging the blackboard lamp, and form the outside line channel.

Compared with the prior art, the present invention has the following beneficial effects:

(1) By replacing fluorescent tubes with LED tubes, since the light-emitting angle is less than 180 degrees, the glare value can be reduced to an extremely low value, which can protect the eyes, and is energy-saving and environmentally friendly, easy to maintain and use

(2) According to the light distribution curve of the LED lamp approximate to the Lambertian body, the reflector obtained through scientific calculation can make the LED blackboard lamp form a highly uniform illuminance distribution and provide a good visual light environment.

Description of drawings

Fig. 1 is the front view of the present invention

Figure 2 is the left view of Figure 1

Figure 3 is a top view of Figure 1

Fig. 4 is a sectional view of the LED lamp tube in Fig. 1

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Figure 1, an LED blackboard lamp that achieves uniform illuminance includes a lamp holder, a free-form reflector, and an LED lamp tube; the light shield 1, the reflector 2, the top plate 3, and the mounting plate 7 are processed by sheet metal parts to form a lamp The lamp holder 8 is fixed on the installation slope 71 through the installation hole 6, and the LED lamp tube 4 is fixed on the lamp holder through the lamp holder 8.

The entire blackboard lighting system is composed of two above-mentioned LED blackboard lights, and the LED light tube is a T8 light tube with a length of about 1200mm. Installation of LED blackboard lights: The distance between the two lights is about 640mm, the distance between the top of the light frame and the distance from the light emitting surface to the edge of the blackboard is 450mm and 400mm respectively, the reflector 2 is installed facing the blackboard, and the distance between the two lights and the center line of the blackboard is 320mm. The LED lamp tube is fixed on the lamp holder through the lamp holder, and the light-emitting surface 41 faces the reflector 2, is parallel to the installation slope 1, and forms an included angle of 20 degrees with the vertical direction.

Take the standard classroom as an example: the standard blackboard area is 1.2*3 meters, and the LED blackboard lamp of the present invention is used at 2*35W. The average blackboard illuminance is greater than 600Lx, and the uniformity is greater than 0.8.

Claims (6)

1. An LED blackboard lamp for achieving uniform illuminance, characterized in that the light shield (1) and the reflector (2), the top plate (3) and the mounting plate (7) are processed by sheet metal to form a lamp holder, and the lamp holder (8) passes through The screw (6) is fixed on the mounting plate, and the LED lamp tube (4) is fixed on the lamp holder through the lamp holder (8). 2. The LED blackboard lamp according to claim 1, characterized in that the mounting plate (7) faces the reflector (2) and the vertical direction to form an installation slope (71) at an angle of 20 degrees, and there are two installation slopes on the installation slope. The hole (6) is used to fix the lamp holder. 3. The LED blackboard lamp according to claim 1, characterized in that the LED lamp tube (4) is fixed on the lamp stand through the lamp holder (8), its luminous angle is less than 180 degrees, and the luminous surface (41) faces the reflector ( 2), parallel to the installation slope (71), and form an included angle of 20 degrees with the vertical direction. 4. The LED blackboard lamp according to claim 1, characterized in that the reflector (2) is fixed between the light baffle (1) and the top plate (3) through sheet metal processing, and a high-reflectivity specular reflection film is pasted on it . 5. The LED blackboard lamp according to claim 1, characterized in that the visor (1) is connected to the end of the reflector (2) through sheet metal processing, parallel to the top plate (3), and the width is about 1/2 of the top plate . 6. The LED blackboard lamp according to claim 1, characterized in that there are two installation holes (6) on the lamp board (3), which are used for fixing and hanging the blackboard lamp, and constitute an external line channel.

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