36results about How to "Guaranteed rotation speed" patented technology

This invention relates to the field of projection technology, specifically to a projection device and system with adjustable position based on distance. The device includes a housing and a projection mounting plate mounted on top of the housing. A rotation control base is fixedly installed inside the housing, driving the projection mounting plate to rotate at a specific angle. A limiting groove is formed on the surface of the housing, within which an extension plate is slidably limited. The surface of the extension plate has driving teeth, and an intermediate gear meshes with the external of the driving teeth. This projection device automatically adjusts the rotation angle of the projection mounting plate based on the distance to the screen detected by distance sensors on both sides, ensuring that the projection centerline of the projector is perpendicular to the screen when viewed from above, facilitating image correction during installation, adjustment, and movement of the projector.