Finely-adjustable anti-reflective blackboard

Abstract

The invention relates to a finely-adjustable anti-reflective blackboard. The finely-adjustable anti-reflective blackboard comprises two blackboards which are connected together through a hinge and are movably arranged in a blackboard frame, wherein fine adjustment mechanisms are arranged at the outer edges of back face plates of the blackboards; cranking hand wheels of the fine adjustment mechanisms drive sleeves to turn, meanwhile, spring devices are contracted, the sleeves drive bevel gear groups, the bevel gear groups drive cams to move, the blackboards are jacked up by the cams, and fine adjustment or the change of positions of reflective areas of the blackboards is realized, so that the avoidance of light reflection is realized; after a proper angle is obtained through adjusting, the cranking hand wheels are released and return under the action of springs, self-locking mechanisms are enabled to be in a locked state, and the reverse self-locking of the blackboards is realized. According to the finely-adjustable anti-reflective blackboard, when visual sense is affected due to lighting changes of a classroom, a turning angle of the blackboard can be appropriately adjusted to remove light reflection, the utilization ratio of the blackboard is greatly increased, and the manufacturing cost is low.

Description

technical field [0001] The invention relates to the field of teaching aids, and particularly designs a finely adjustable anti-reflection blackboard. technical background [0002] The blackboards used in the classroom are all flat blackboards that can be pushed up and down. There are slide rails on both sides of the blackboard, which can slide back and forth in the bottom groove. However, when there is strong light on both sides of the classroom, the plane of the blackboard can only move up and down, so it cannot be affected by the reflection of the blackboard surface. Especially for the students who sit in the front row and listen to the class, this kind of reflection has a greater impact, and even more than half of the writing on the blackboard cannot be seen clearly, which seriously affects the teaching efficiency of the teacher and the effect of listening to the students. Contents of the invention [0003] In order to overcome the defects of the prior art, the object o...

AI Technical Summary

Problems solved by technology

However, when there is strong light on both sides of the classroom, the plane of the blackboard can only move up and down, so it cannot be affected by the reflection of the blackboard surface

Especially for students sitting in the front row listening to the class, this kind of reflection has a greater impact, and even more than half of the writing on the blackboard cannot be seen clearly, which seriously affects the teaching efficiency of the teacher and the effect of listening to the students

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