Projection lens optical system

Abstract

The invention provides a projection lens optical system. The optical system comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens,an eighth lens and an imaging target surface which are sequentially arranged from an object side to an image side and share the same optical axis. According to the invention, a plurality of lenses are combined, and the design of focal power and shape structures of the first lens to the eighth lens and the position design of each lens are combined, so that the projection lens optical system is ina phi 30 large target surface range, on-axis and off-axis aberrations are fully corrected, the imaging quality is not obviously changed along with the view field, the consistency is good, and the optical characteristics are excellent.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a projection lens optical system. Background technique [0002] A bright starry sky is the dream of most astronomy enthusiasts. In order to achieve a good look and feel, a projector can be used to project the starry sky onto the ceiling or wall, which requires the projector to have a long projection distance, a large projection area and a high relative illumination. However, in order to achieve the effect of large target surface, low distortion and high relative illumination, most projection instruments often use aspherical lenses. The production of aspherical lenses requires high cost of grinding tools, which will inevitably lead to an increase in cost. Moreover, if it is a plastic aspherical lens, the temperature stability is too poor, and the image quality will be affected due to the increase in temperature. [0003] To sum up, it is of great significance to design a p...

AI Technical Summary

Problems solved by technology

The production of aspherical lenses requires high abrasive costs, which will inevitably lead to an increase in cost. Moreover, if it is a plastic aspheric surface, the temperature stability is too poor, and the image quality will be affected by the increase in temperature.

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