Zooming projection lens

Abstract

This invention relates to a zoom which is applicable to different projectors, the main features are: the optical system consists of the front fixed lens group E1 with a negative focal power, the movable lens groups E2, E3, E4 and back fixed lens group E5, the three lens groups array along the optical axis from the screen to the surface side, in which, the movable lens group E2, E3, E4 move along the optical axis from the from the wide-angle point to the end-point to achieve zooming. In the unit, all lenses are spherical to improve the quality of imaging.

Description

technical field [0001] The invention belongs to the technical field of optical appliances, and is a zoom projection lens suitable for matching use on various projectors. Background technique [0002] Most projectors used to project images on film, slides, or LCD monitors as enlarged images on a screen are usually equipped with a zoom projection lens. Among the disclosed zoom projection lens patents, some patents apply aspheric technology, that is, adding an aspheric lens to the optical system of the zoom projection lens to improve the imaging quality of the system. However, the application of aspheric lenses requires strict processing and assembly, which is not conducive to the improvement of production efficiency and the reduction of costs. In the technology that does not use aspherical lenses, in order to achieve better optical performance, the technical measures are first to increase the number of lens combinations, generally using more than 12 pieces, and the second is ...

AI Technical Summary

Problems solved by technology

However, the application of aspheric lenses requires strict processing and assembly, which is not conducive to the improvement of production efficiency and the reduction of costs

In the technology that does not use aspherical lenses, in order to achieve better optical performance, the technical measures are first to increase the number of lens combinations, generally using more than 12 pieces, and the second is to use imported high-refractive index high-block optical materials For example, materials such as FCD1, which have significantly improved aberrations, are expensive, poor in manufacturability, low in processing efficiency and yield, and cannot meet the manufacturability requirements of mass production.

In a zoom projection lens disclosed in Japanese Patent No. 02120574, the materials used include FCD1, LAF and other high-grade materials, and the number of lenses is more than 12, so there are also problems such as high cost and low work efficiency.

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