Anti-reflective blackboard with rotatable angle adjustment
An anti-reflective and blackboard technology, applied in the field of teaching equipment, can solve the problems of reduced enthusiasm for teacher-student interaction, insufficient understanding of knowledge, lack of rapid positioning mechanism, etc., and achieve good universal applicability, promotion value, assemblability and manufacturability Good, the effect that meets the viewing angle requirements
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[0024] figure 1 It is a schematic diagram of the structure of the present invention, figure 2 for figure 1 top view diagram, image 3 for figure 1 The top view from the right side, as shown in the figure: the rotatable angle-adjustable anti-reflection blackboard of this embodiment includes an inner frame 1, an outer frame 2 and a blackboard body, the blackboard body is arranged in the inner frame 1, and the inner frame 1 is It is set in cooperation with the outer frame 2 in a manner that can rotate around the vertical center line;
[0025] It also includes an indexing positioning mechanism, which includes an arc bar 3 and a positioning assembly, the arc bar 3 is arranged on the inner side of the outer frame 2, and the positioning assembly includes a spring 5 and a positioning ball 6, and the spring 5 is installed in the external opening groove provided on the inner frame 1, a number of spherical positioning grooves 4 are arranged on the inner side of the arc bar 3 along t...
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