Collimation lens and design method thereof

Abstract

The invention discloses a collimation lens and a design method thereof. The collimation lens has a rotation symmetrical structure, a light source center is arranged on a rotation symmetrical axis, and the lens comprises an incident plane, a first reflection plane, a second reflection plane and an emitting plane. The first reflection plane is disposed between the incident plane and the second reflection plane, light emitted from a light source passes through three parts, the first part of light is emitted from the emitting plane at the top portion of the lens without passing through any optical media; the second part of light is refracted through the incident plane, then is totally reflected through the emitting surface, then is incident to the second reflection plane and then is emitted from the emitting plane after being reflected by the second reflection plane; and the third part of light goes into a first emitting plane after being refracted by the incident plane and then is emitted from the emitting plane after being totally reflected by the first emitting plane. The lens can solve the defects of quite large volume and weight of a conventional lens in the prior art and reduces the manufacturing cost of the lens.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a collimating lens and a design method thereof. Background technique [0002] Converging optical lenses are widely used in LED lighting. Commonly used LED converging optical lenses use a technology based on total internal reflection. Patent CN01805486.2 provides a converging optical lens based on total internal reflection. The structure of this type of optical lens can be roughly divided into two parts: a refraction surface group and a total reflection surface group, such as figure 1 shown. The refraction surface group includes an incident refraction surface and an exit refraction surface, and the light exits after two refractions; the total reflection surface group includes a side incident surface, a total reflection surface and an exit surface. The specific curved surface structure has evolved into many forms, such as CN200910108644.1, CN200910261795, CN201110101048.8 and US740...

AI Technical Summary

Problems solved by technology

[0003] This type of design has the advantages of comprehensive light control, high design freedom, and convenient mold design, but its disadvantage is that the lens height is proportional to the aperture and roughly equal

As the aperture increases, the height also increases proportionally, resulting in a large volume and weight of the lens, which increases its cost in applications with large apertures and small angles

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