Focusing method, focusing device and projection light machine for projection light machine

Abstract

The invention provides a focusing method, a focusing device and a projection light machine for a projection light machine. The focusing method includes: detecting the actual deformation of the optical-mechanical lens; controlling and adjusting the focal length of the optical-mechanical lens according to the actual deformation of the optical-mechanical lens. The focusing method of the projection optical machine, through real-time detection of the actual deformation of the optical-mechanical lens, and real-time control and adjustment of the focal length according to the actual deformation of the optical-mechanical lens, can greatly improve the accuracy of the focal length adjustment of the optical-mechanical lens, thereby greatly improving It solves the out-of-focus situation of the optical-mechanical lens caused by the deformation caused by the thermal expansion and contraction of the optical-mechanical lens due to the influence of temperature, and thus greatly improves the projection clarity of the projection optical-engine. The lens material solution, the focusing method also reduces the material cost of the projection light engine.

Description

technical field [0001] The present invention relates to the field of projection technology, in particular to a focusing method of a projection light machine, a focusing device and a projection light machine. Background technique [0002] In recent years, with the rapid development of intelligent projection, excellent picture presentation methods and competitive prices have quickly gained a large market share. A projection system, also known as a projector, refers to a device that projects pictures, text or video onto a curtain or wall by projection. [0003] The presentation of the projection system is mainly through the "light machine". The light source of the light machine mainly comes from three types: light bulbs, LED lights and lasers. However, no matter what kind of light source is in the process of generating light, it will emit a lot of heat. The optical-mechanical lens is more prone to thermal expansion and contraction, resulting in slight deformation, which will c...

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Problems solved by technology

[0003] The presentation of the projection system is mainly through the "light machine". The light source of the light machine mainly comes from three types: light bulbs, LED lights and lasers. However, no matter what kind of light source is in the process of generating light, it will emit a lot of heat. The optical-mechanical lens is more prone to thermal expansion and contraction, resulting in slight deformation, which will cause the optical-mechanical lens to lose focus during long-term operation, that is, the image presented on the screen is blurred, and the projection focal length needs to be readjusted to make the picture clear

[0004] At present, in order to reduce the deformation of the optical-mechanical lens due to thermal expansion and contraction, high-end projectors usually use an all-metal structure shell, and the optical-mechanical lens uses an all-glass lens instead of a resin lens, which is conducive to the heat dissipation of the optical-mechanical lens , thereby reducing its deformation, but this greatly increases the cost of the projection system

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