Gradually-changed trapezoidal light spot lens

Abstract

A gradually-changed trapezoidal light spot lens comprises a lens body, and is characterized in that the lens body consists of a 1 / 4 spherical surface and a cylinder, and the 1 / 4 spherical surface is gradually transited into the cylinder; and the lens body is provided with a light entering concave surface, a light exiting surface and a reflecting surface, wherein the light entering concave surface is arranged at the bottom of the spherical surface; the light exiting surface is arranged on a body surface of the spherical surface; the reflecting surface is arranged on the top of the lens body; the light entering concave surface is a 1 / 2 round-top conical concave surface; the light exiting surface consists of a 1 / 4 spherical surface and a cylindrical surface tangent with the 1 / 4 spherical surface; and the reflecting surface is an inclined plane. During application of the light-emitting diode (LED) gradually-changed trapezoidal light spot lens, light rays of a light source can be effectively controlled on a rectangular area, and the illumination of the gradually-changed trapezoidal light spot lens on the rectangular area can be uniform. The light rays of the LED light source are effectively utilized.

Description

technical field [0001] The invention relates to a lens, in particular to a gradient trapezoidal spot lens used in billboard lighting fixtures. Background technique [0002] The current traditional billboard lamps have the characteristics of high color rendering index, but due to the low luminous efficiency of the traditional light source and the high temperature of the light source, the light distribution effect is not good, resulting in the excessive power density of the lamps used in the entire billboard, and the light source Short service life and increasing maintenance costs, LED light sources have the characteristics of high color rendering index and high brightness, which gradually show their advantages in billboards; current LED billboard lamps are generally composed of symmetrical lenses, which are characterized by distant light Intensity and near light intensity are equal, but due to the different projection distances, the surface illuminance of the illuminated obje...

AI Technical Summary

Problems solved by technology

[0002] The current traditional billboard lamps have the characteristics of high color rendering index, but due to the low luminous efficiency of the traditional light source and the high temperature of the light source, the light distribution effect is not good, resulting in the excessive power density of the lamps used in the entire billboard, and the light source Short service life and increasing maintenance costs, LED light sources have the characteristics of high color rendering index and high brightness, which gradually show their advantages in billboards; current LED billboard lamps are generally composed of symmetrical lenses, which are characterized by distant light Intensity and near light intensity are equal, but due to the different projection distances, the surface illuminance of the illuminated object is different, and the illuminance in the near area is often very large. The light and dark changes are particularly obvious, but the illuminance in the distance is very low, resulting in extremely uneven brightness distribution to the human eye. The power density of the lamps used by the brand has increased sharply, and the energy-saving advantages are not so obvious compared with traditional light sources.

And it is accompanied by a result of large investment and low energy efficiency

Images