Lens used for short-focus projection machine

Abstract

The invention provides a lens used for a short-focus projection machine. The lens comprises a base, a lens assembly, a reflector, a focusing device and a back focus focusing device, wherein an accommodating cavity is arranged on the base; the lens assembly is arranged inside the accommodating cavity; a front light through hole and a rear light through hole are formed in the front end and the rearend, opposite to the lens, of the accommodating cavity respectively; the reflector is arranged on the rear light through hole; the focusing device and the back focus focusing device are arranged on the left side and the right side of the base respectively; the middle part of the reflector is fixed on the base through two lock screws; and the lower side of the reflector is connected with the base through two adjustable screws. The lens is simple in structure, and the reflector is integrated onto the base, so that the quantity of components of an adjusting structure of the reflector is reduced,and then the assembling accuracy is improved; moreover, the reflector is positioned by adopting a four-point connection method and is positioned by using two points, and the other two points are movably adjusted, so that the degree of freedom of the reflector is reduced, and the adjusting accuracy is greatly reduced.

Description

【Technical field】 [0001] The invention relates to the field of optical equipment, in particular to a lens for a short focal length projector. 【Background technique】 [0002] As projectors are more and more widely used in commercial and household applications, consumers have higher and higher requirements for projectors, not only requiring good picture effects, but also requiring large projection screen size and short projection distance. Small footprint. As the core component of the projector, the optical lens, including the short focal length projector lens, can make the projector meet the above requirements. [0003] For the short-focus projector lens, the adjustment and fixing structure of the reflector, the connection structure between the reflector and the lens, and the connection structure between the lens and the projector lighting part are very important. As the market has higher and higher requirements for the resolution of the projection lens, the size of the pro...

AI Technical Summary

Problems solved by technology

However, according to the current level of processing technology, it is very difficult to guarantee the accuracy of lens parts, which leads to poor system accuracy of parts accumulation and high cost

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