Light-emitting diode (LED) blackboard lamp

Abstract

The invention discloses an LED blackboard lamp. The LED blackboard lamp comprises an LED lamp frame arranged on the inclined upper portion. An LED lamp bar is fixed at the bottom of the LED lamp frame and comprises a plurality of LED lamp beads which are covered with a lens. A concave portion is opened in the lens, the LED lamp beads are arranged in the concave portion, and the depth of the concave portion is reduced gradually from one side away from the blackboard to one side close to the blackboard. The lens converts uniformly scattered light into large-angle polarized distributed light, so that light projected from the concave portion is distributed from low light to high light from the top to the bottom on the blackboard surface, and the defect of attenuated illuminance of the blackboard surface from the top to the bottom caused by the fact that traditional blackboard lamps are close to the top of the blackboard and far from the bottom of the blackboard is offset; meanwhile, by means of the large-angle light distribution on the blackboard surface from the left to the right, the illuminance uniformity of the blackboard length direction is guaranteed, the LED blackboard lamp light utilization rate is improved, and glare is reduced effectively.

Description

technical field [0001] The invention relates to an LED lamp, in particular to an LED blackboard lamp. Background technique [0002] The blackboard plays a very important role in the teaching activities in the classroom. Most of the primary and secondary schools and even universities now mainly use blackboard writing as the main teaching method. Therefore, a better blackboard lamp or lighting design is particularly important for the blackboard. However, if the average illuminance of the blackboard lamp on the blackboard is relatively low and the illuminance is uneven, it will affect the visual conditions of the blackboard content and easily cause Viewer's visual fatigue. In view of this situation, the blackboard lamp is required to have a more reasonable light distribution, light intensity distribution and installation position. [0003] Traditional blackboard lamps generally only use two fluorescent tubes, and the blackboard lamps are installed obliquely above the blackboa...

AI Technical Summary

Problems solved by technology

[0003] Traditional blackboard lamps generally only use two fluorescent tubes, and the blackboard lamps are installed obliquely above the blackboard. The blackboard lamps are closer to the top of the blackboard and farther from the bottom of the blackboard, so that the illuminance on the surface of the blackboard gradually decays from top to bottom. And the average illuminance on the surface of the blackboard is low; better blackboard lights use bracket lights as lighting fixtures, but bracket lights are usually installed on the edge of the blackboard, which has the disadvantages of poor direction controllability and low light utilization. The lamps of the bracket lamp are very close to the podium, which will generate relatively large glare. Therefore, the existing blackboard lighting lamps have defects such as poor illumination uniformity and glare.

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