Lens and lamp using lens

Abstract

The invention relates to a lens and a lamp using the lens. The lens is a round table type lens with a lens axis as a symmetric axis and comprises a first end face which is small in diameter, a second end face which is large in diameter and a side wall. The middle of the first end face concaves inwards to form a light source containing cavity suitable for containing a light source. The side face of the light source containing cavity is a spherical face. The bottom face of the light source containing cavity is an outwards-convex free curved face. The side wall is a parabolic face. A focal point of the parabolic face is overlapped with a spherical center of the spherical face. The light outlet diameter of the lens is 40 + / - 1% millimeters. The thickness of the lens is 40 + / - 1% millimeters. According to the lens and the lamp using the lens, due to collimation of the side wall and the free curved face, a half light intensity angle of the lens is enabled to be small, therefore, the lens is enabled to have a large condensation ratio, a light spot with a large condensation ratio is capable of being formed, and requirements of spotlighting in a small range are satisfied. Meanwhile, due to the fact that light of the side face of the light source is used, utilization rate of light energy is enabled to be largely improved.

Description

【Technical field】 [0001] The invention relates to the lighting field, in particular to a lens and a lamp using the lens. 【Background technique】 [0002] With the continuous improvement of the luminous efficiency of the light source, the application of LED in the field of lighting is also becoming wider and wider. However, in some special fields, such as medical treatment, public security and hunting fields, spotlight illumination in a small range is often required, so higher requirements are put forward for the secondary light distribution design of the optical collimator lens. [0003] At present, the traditional collimating and light distribution lenses are mostly spherical or aspheric in the form of concave and convex. However, the collimation effect of this simple form of optical collimation lens is not ideal, the half-light intensity angle is about 10 degrees, and the light-gathering ratio is small, which cannot meet the spotlight lighting in a small area. At the same...

AI Technical Summary

Problems solved by technology

However, the collimation effect of this simple form of optical collimation lens is not ideal, the half-light intensity angle is about 10 degrees, and the light-gathering ratio is small, which cannot meet the spotlight lighting in a small range

At the same time, the side of the light source cannot be used to emit light, resulting in low light energy utilization efficiency, which is about 60%, which greatly wastes light energy and reduces brightness.

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