| 摘要 |
PURPOSE: A glass blackboard is provided to improve the erasing property and the abrasion resistance of the blackboard when using as a blackboard, and to secure the high brightness and resolution when using as a rear side motion-picture screen. CONSTITUTION: A glass blackboard capable of using as a rear side motion-picture screen includes the following: a front glass substrate with the thickness of 2~10 millimeters, the glossiness of the front side of 5~60, and the surface roughness of 0.05~1 micrometers, including a low reflection uneven surface; a light diffusing film laminated on the rear side of the front glass substrate with the thickness of 75~250 micrometers; and a rear glass substrate with laminated on the rear side of the light diffusing film with the thickness of 2~10 millimeters.
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