Projector and projection lens thereof

Abstract

The invention relates to a projector and a projection lens thereof. The projector comprises an image light source generation device and the projection lens, wherein the projection lens comprises a relaying optical system and an projecting optical system; the relaying optical system comprises a focusing optical group and a condensing optical group; each of the focusing optical group and the condensing optical group comprises at least one lens; in addition, the focusing optical group can move between the condensing optical group and the image light source generation device; the projecting optical system comprises a projection lens group and a reflector; the projection lens group is located between the reflector and the relaying optical system; and when the image light source generation device generates an image light beam, the image light beam passes through the relaying optical system, penetrates through the projection lens group, and reversely penetrates through the projection lens group after through the reflection of the reflector, and is projected to an imaging plane.

Description

technical field [0001] The invention relates to an optical projection device; in particular, it refers to a projector and a projection lens thereof. Background technique [0002] With the advancement of video technology, projectors are becoming more and more popular, and the projection lens used to clearly present images on the screen is one of the core components. With the limitation of the use of space, in order to achieve a clear projection effect in a small space, the projection lens of the projector is gradually designed in the direction of a short-focus projection lens, but in order to have a good projection effect in a short distance, short Focal lenses usually use a large number of lenses with large volume to achieve the effect of short focal length and high optical power. [0003] As a result, the existing short-focus projection lens is not only bulky and heavy, but cannot achieve the miniaturized and lightweight design advocated today, but also because the interna...

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Problems solved by technology

[0003] As a result, the existing short-focus projection lens is not only bulky and heavy, but cannot achieve the miniaturized and lightweight design advocated today, but also because the internal lenses are both heavy and heavy, so it takes a long time to manufacture. It takes a lot of time to assemble, and its material cost is also more expensive

[0004] And in order to improve the above-mentioned shortcoming, then some industry develops a kind of rear-projection type projector, promptly utilizes reflective mirror to reflect the image light beam of projector inside to be transmitted to the imaging plane, but this kind of model is because there is no focusing function, in the The setting can only be set at a fixed distance from the imaging surface, and the setting position cannot be changed according to different projection environments, which greatly reduces its applicability

Therefore, based on the above, it can be known that the optical design of known projectors and projection lenses is still not perfect, and there is room for improvement

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