Automatic focusing assembly and projector

Abstract

A projector and an automatic focusing assembly thereof are disclosed. The automatic focusing assembly comprises a driving member, a connecting member, a first sensor and a magnetic member. The connecting member is driven by the driving member to move, the connecting member is used for being connected with a focusing structure of a lens of the projector, and the magnetic member is arranged on the connecting member. The first sensor senses the magnetic field of the magnetic piece and outputs an induction electric signal, the induction electric signal is used for determining the position of the connecting piece, and the driving piece is further used for correcting the position of the connecting piece according to the corresponding relation between each projection distance and the position of the focusing structure when focusing is clear so that the focusing structure can move to the position where focusing is clear. The current position of the connecting piece can be obtained by sensing the magnetic field of the magnetic piece through the first sensor, and the processor corrects the position of the connecting piece according to a preset program, so that clear focusing of the lens is ensured, focusing control and feedback are included, closed-loop focusing control is realized, the lens can automatically realize real-time clear focusing. And the working efficiency and the use experience can be improved.

Description

technical field [0001] The invention belongs to the technical field of projectors, and in particular relates to an automatic focus assembly and a projector. Background technique [0002] Most of the autofocus structures of existing projectors realize focusing through an open-loop stepping motor drive. The open-loop control method tends to blur the focus due to the quality of the focusing structure itself. Users can only re-calibrate the focusing structure to achieve a clear auto-focusing effect, which affects work efficiency and user experience. Contents of the invention [0003] The purpose of the present invention is to provide an autofocus assembly and a projector, which can realize closed-loop control of focusing, and improve work efficiency and work experience. [0004] For realizing the purpose of the present invention, the present invention provides following technical scheme: [0005] In a first aspect, the present invention provides an autofocus assembly, which ...

AI Technical Summary

Problems solved by technology

The open-loop control method is easy to focus unclearly due to the influence of the quality of the focusing structure itself. Users can only re-calibrate the focusing structure to achieve a clear auto-focusing effect, which affects work efficiency and user experience.

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