Lens type light-emitting diode (LED) blackboard light

Abstract

The invention belongs to the technical field of lighting, and particularly relates to a lens type light-emitting diode (LED) blackboard light. The lens type LED blackboard light structurally comprisesa light shell, an LED light bead, a printed circuit board (PCB), an optical lens and a plastic surface cover, wherein the LED light bead, the PCB, the optical lens and the plastic surface cover forman optical module placed and fixed into a groove in the light shell; and the optical lens is in a long strip shape and is formed by an incident plane, a light-exiting surface and two different total internal reflection surfaces in side surfaces. According to the lens type LED blackboard light provided by the invention, aiming at the position characteristics of a blackboard and the light, a secondary light distribution design is carried out on the LED through the optical lens, and the lens adopts the lens with multiple free form surfaces, fully collects energy emitted by an LED light source through refraction and total internal reflection ways, re-distributes and projects onto a blackboard surface, so that lighting effects on light gathering and light deflecting are achieved, the utilization ratio of optical energy is greatly improved, and meanwhile, higher uniformity is maintained on the blackboard surface. The blackboard light is simple in structure and has higher practicability.

Description

technical field [0001] The invention belongs to the technical field of lighting, and in particular relates to an LED blackboard lamp. Background technique [0002] The blackboard is the most commonly used prop in daily teaching activities and display activities. The blackboard itself does not emit light, it needs to reflect the light from the environment and lamps and then be perceived by human eyes. The application environment of the blackboard is diverse. When the ambient light is not good, it is necessary to use a blackboard light to compensate. Therefore, the optical design of the blackboard light directly affects the uniformity of the blackboard, and then affects the observation of the human eye. [0003] Traditional blackboard lamps use fluorescent lamps as lighting methods, which have disadvantages such as low lighting efficiency, uneven blackboard illumination, obviously low illumination in the lower half of the blackboard, serious glare, and mercury content, and a...

AI Technical Summary

Problems solved by technology

The optical scheme of the lens-type blackboard light is not very mature, and it mostly appears in the form of a wall washer, which does not meet the special conditions of blackboard lighting. There is a huge room for design improvement by using a lens to realize the secondary optical design

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