Projection lens and projection equipment

Abstract

The invention discloses a projection lens and projection equipment, and belongs to the technical field of projection. The projection lens comprises a refractor group and a reflector group which are arranged along the light emitting direction of the light valve; the refractor group comprises a first lens group, a second lens group and a third lens group which are sequentially arranged along the light emitting direction, the first lens group, the second lens group and the third lens group meet the conditions that F2 / F1 is more than 2 and less than 12 and F3 / F1 is more than 2 and less than 15, the first lens group comprises eight spherical lenses which are arranged along the light emitting direction, and the eight spherical lenses comprise two doublet lenses formed by four transparent lenses. The invention provides the structure of the projection lens, and the focal lengths of the three lens groups in the refractor group meet the corresponding proportion size relationship, so that the projection lens can realize higher imaging requirements with a smaller size. The projection lens solves the problem that in the prior art, the size of the lens is difficult to reduce, and the projection lens is small in size.

Description

technical field [0001] The present application relates to the field of projection technology, and in particular, to a projection lens and a projection device. Background technique [0002] With the improvement of science and technology, with the application of home projection equipment, such as laser ultra-short-focus projection equipment, it can present large-scale, high-definition, high-color gamut and brightness images to users in the state of being attached to the wall. Among them, The above-mentioned high-quality images are presented not only because the laser is used as the light source, but also the ultra-short-focus lens with high resolution is also an important part of the laser projection equipment. The higher the resolution capability of the projection lens, the better the viewing experience of the user. [0003] In the process of lens design, various needs need to be taken into account. For example, the projection lens needs to be designed with the lighting sys...

AI Technical Summary

Problems solved by technology

[0005] That is, in order to achieve higher resolution and shorter focal length, the combination of lenses in the projection lens is usually more complicated

As a result, the overall structure of the projection lens is relatively complex, which is not conducive to the reduction of the lens volume, and the volume of the projection lens accounts for more than one-third of the optical engine of the projection device, which will also make it difficult to reduce the volume of the entire laser projection device. device looks bulky

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