LED area light source device

Abstract

The invention relates to an LED area light source device which comprises a lamp holder, a lamp pole arranged on the lamp holder, a plurality of point light sources arranged on the outer surface of the lamp pole, first prismatic lenses and second prismatic lenses, wherein the first prismatic lenses and the second prismatic lenses correspond to the plurality of point light sources and are sequentially arranged at the outer side of the lamp pole; the first prismatic lenses and the second prismatic lenses are respectively made of transparent substrates and respectively provided with a light inlet surface and a light outlet surface opposite to the light inlet surface; a plurality of uniformly arrayed long strip-shaped arc protrusions are respectively formed on the light outlet surfaces of the first prismatic lenses and the second prismatic lenses; the first prismatic lenses are arranged along the length extension direction of the arc protrusions and arrayed along a first direction relative to the axial direction of the lamp pole, the second prismatic lenses are arranged along the length extension direction of the arc protrusions and arrayed along a second direction relative to the axial direction of the lamp pole, and the first direction and the second direction are orthogonal; and a first preset distance is spaced between the first prismatic lenses and the point light sources, and a second preset distance is spaced between the second prismatic lenses and the first prismatic lenses.

Description

technical field [0001] The invention relates to a surface light source device, in particular to an LED surface light source device with double-layer prism sheets. Background technique [0002] Light-emitting diodes have the advantages of fast response, long life, low power consumption, low pollution, high reliability, and suitable for mass production. Therefore, LEDs are gradually used as fluorescent lighting devices. However, LED is a point light source with a small luminous angle and strong directionality. In order to obtain a large enough luminous area, multiple LEDs are usually arranged in an array. However, when multiple point light sources illuminate an object at the same time, the illuminated object usually produces multiple shadows. In addition, because the current LED lamps are distributed in a dot-like matrix, and the luminous intensity of the LED monomer is high, strong direct glare (bright spots) are formed on the light-emitting surface of the LED lamp, and it i...

AI Technical Summary

Problems solved by technology

However, although the use of a diffuser plate or a light diffusion material can improve the uniformity of the emitted light, it will cause a large loss of light during transmission, thereby reducing the brightness of the emitted light

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