Focusing component control method, device, focusing component, and projector

Abstract

The invention relates to the field of digital projection display, in particular to a control method and device for a focusing assembly, a focusing assembly, and a projector. The focusing assembly includes a lens module, a motor, an oblique block and a photoelectric switch. The photoelectric switch includes a phototransmitter and a photoreceiver oppositely arranged. The motor is connected with the lens module to drive the lens module to move. When the slant baffle and the photoelectric switch move relative to each other, the light field between the light emitter and the light receiver is located on the movement path of the slant baffle, and when the slant baffle moves in the light field, the receiving amount of the light receiver changes , the photoelectric switch generates a voltage signal according to the amount received. The method includes: receiving the current voltage signal of the photoelectric switch; determining the current position of the lens module according to the current voltage signal; if the current position of the lens module reaches a preset position, controlling the motor to stop driving the lens module. Through the above method, the present invention can stop the lens module at any real-time position and improve the focusing precision.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of digital projection display, and in particular, relate to a method and device for controlling a focusing assembly, a focusing assembly, and a projector. Background technique [0002] With the development of semiconductor technology and the improvement of integration, the volume of projectors can be made smaller and smaller. However, the reduction in the volume of the projector reduces the available space in the projector, so that the focusing component in the projector can only be equipped with a photoelectric switch to detect the movement of the lens module. Wherein, when a photoelectric switch is installed to detect the movement of the lens module, the voltage signal generated by the photoelectric switch is mainly used for detection. [0003] At present, a rectangular baffle is usually used to trigger the photoelectric switch to generate a voltage signal, but the inventor found in ...

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Problems solved by technology

[0003] At present, a rectangular baffle is usually used to trigger the photoelectric switch to generate a voltage signal, but the inventor found in the process of realizing the present invention that when using a rectangular baffle to trigger the photoelectric switch to generate a voltage signal, due to the rectangular baffle in the light field of the photoelectric switch The occlusion area remains unchanged during internal relative movement (such as figure 1 The shown P is the shading area), and the receiving capacity of the photoelectric switch light receiver cannot be changed, so that the voltage signal of the photoelectric switch remains unchanged when the rectangular baffle moves in the light field. Therefore, only when the rectangular baffle enters the light field and When leaving the light field, the voltage signal of the photoelectric switch jumps (such as figure 2 As shown), based on this, when the movement of the lens module is detected by the voltage signal triggered by the rectangular block, only the position of the lens module when the rectangular block enters and leaves the light field can be determined, and the focusing accuracy is poor

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