projection optical system

Abstract

The invention belongs to the field of design projection equipment optical systems, particularly relates to a projection optical system improving a light utilization rate and projection brightness, andaims to solve the problem of low light utilization rate and complex system structure which exist in the prior art. Polarized light P emitted by a laser source passes through a convergent mirror and is transmitted by a polarized beam splitter prism, polarized light P transmitted by the polarized beam splitter prism passes through a color wheel, an integral square rod and a relay lens group in sequence and is incident to a DMD, emergent light in a projection direction of the DMD is emergent through a project lens, emergent light in a non-projection direction of the DMD passes through a reflex lens group to obtain polarized light S, and polarized light S reflected by the polarized beam splitter prism and the polarized light P transmitted by the polarized beam splitter prism are coaxially incident to the color wheel; and the reflex lens group includes a total reflector A, a relay lens group B, a total reflector B and a 1 / 2 wave plate; and the emergent light in the non-projection directionof the DMD is sequentially reflected by the total reflector A and refracted by the relay lens group B and 1 / 2 wave plate to obtain polarized light S.

Description

technical field

[0001] The invention belongs to the field of optical system design of projection equipment, and in particular relates to a projection optical system for improving light utilization rate and projection brightness. Background technique

[0002] The single-chip DMD projection equipment is small in size and simple in optical-mechanical structure, and is widely used in the market. However, due to the limitation of the projection principle of the DMD, with the different projection screens, there will be an indeterminate amount of light exiting through the non-projection direction of the DMD, resulting in The waste of light sources reduces the light utilization rate and projection brightness of single-chip DMD projection equipment. At the same time, due to the heat dissipation problem that the outgoing light in the non-projection direction is converted into heat, it is necessary to design a high-performance heat dissipation system, which increases to a certain extent...

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