Detachable projection screen

Abstract

The invention discloses a detachable projection screen, and belongs to the technical field of projection screens. The detachable projection screen comprises a screen frame fixedly arranged on a wall body, first electromagnetic devices are arranged on an upper border and a lower border of the screen frame, a screen is arranged in the screen frame, second electromagnetic devices are arranged on the rear side of the top and the rear side of the bottom of the rear side of the screen, and the first electromagnetic devices are connected with the second electromagnetic devices so that the screen can be attracted in the screen frame. The projection screen is convenient to mount and dismount, the mounting and dismounting steps are reduced, the dismounting and mounting time is saved, and the dismounting and mounting efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of thermal decomposition of substances, in particular to a detachable projection screen. Background technique [0002] With the rapid development of information technology, projection technology has been widely used in multimedia education systems and office conference systems. Projection systems generally include projectors and projection screens. According to the installation method of projection screens, projection screens can be roughly divided into two categories. One type is a rollable projection screen, and the other is a fixedly installed non-rollable frame type projection screen. When the rollable projection screen is not in use, the projection screen can be rolled up. It has the function of protecting the projection screen; and it does not take up space, so it has been loved by some users. However, compared with the frame projection projection screen, it still has the following disadvantages: on th...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of information technology, projection technology has been widely used in multimedia education systems and office conference systems. Projection systems generally include projectors and projection screens. According to the installation method of projection screens, projection screens can be roughly divided into two categories. One type is a rollable projection screen, and the other is a fixedly installed non-rollable frame type projection screen. When the rollable projection screen is not in use, the projection screen can be rolled up. It has the function of protecting the projection screen; and it does not take up space, so it has been loved by some users. However, compared with the frame projection projection screen, it still has the following disadvantages: on the one hand, it needs to be designed to drive the projection screen to roll up. In this way, the structural design of the retractable projection screen is more complicated than that of the frame type projection screen, so its material cost, processing cost, and maintenance cost are higher than that of the frame type projection screen, and its winding mechanism is also prone to failure after long-term use. faults, resulting in a high failure rate; on the other hand, since there is no fixing device at the bottom of the projection screen when the retractable projection screen is unfolded, its structure is unstable and easily affected by the external environment (such as wind). will reduce its projection effect

[0003] The traditional frame-type projection screen has cumbersome installation and removal steps and is not easy to replace

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