Projection light machine

Abstract

The invention discloses a projection light machine, which comprises a projection lens and an image source, wherein the image source is used for projecting light to the projection lens. According to the invention, the field angle and the focal length of the projection lens meet the requirement that the image source can be located in the image circle of the projection lens, so that it is guaranteed that all the light projected by the image source can form a clear image after passing through the projection lens; the position of the projection lens relative to the image source satisfies the condition that the ratio of the distance from the center of an image projected into the image circle of the projection lens by the image source to the optical axis of the projection lens to half of the size of the image projected into the image circle of the projection lens is greater than 1, so that the ratio of the distance from the position where the optical axis of the projection lens is projected on the projection picture to the center of the projection picture to half of the size of the projection picture is larger than 1, namely the projection light machine achieves large offset so as to avoid the situation that the projection picture is shielded in some application scenes.

Description

technical field [0001] The invention relates to the field of projection technology, in particular to a projection light machine. Background technique [0002] With the development of micro-projector technology, ultra-short-throw projectors have gradually entered people's field of vision. At present, micro-projectors are mainly used in fields such as home entertainment, education and learning, business meetings or military affairs. In the field of projection light machines, offset is a key parameter, which represents the ratio of the distance between the position where the optical axis of the projection light machine is projected onto the projection screen and the center of the projection screen, and half the width of the projection screen. [0003] The existing projection light machine can achieve a bias of 0%, that is, the center of the projection screen coincides with the optical axis, or a projection light machine with a bias of 100%, that is, the center of one edge of t...

AI Technical Summary

Problems solved by technology

However, in the application scenario where the projection light machine is between the observer and the projection screen, the projection light machine with the above-mentioned offset may have the situation that the projection screen is blocked by the projection light machine when viewed from the perspective of the observer.

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