Fabrication method of seamless rear projection spherical screen and device thereof

Abstract

The invention relates to a fabrication method of a seamless rear projection spherical screen and a device thereof. The fabrication method is characterized in that a reaction-type resin is injected into a hollow die by a double-rotation forming method so that the reaction-type resin can react and be cured on the inner side surface of a spherical die to form a base; and an optical projector is fabricated on the base by the same method. The method and the device can be used for fabricating the seamless rear projection spherical screen by simple operation, and the products have good uniformity.

Description

technical field [0001] The present invention relates to a manufacturing method and device of a rear-projection ball screen, more precisely, a manufacturing method and device of a seamless rear-projection ball screen Background technique [0002] In recent years, spherical projection screens have become more and more popular in the market. The spherical projection screens used in education and display products have changed the concept of flat projection screens and brought new experiences to users. One of the components in this system - the projection screen ball, is one of the key components. [0003] The existing technology has the following several ways to realize it. [0004] 1. The plexiglass blister projection screen ball, using the thermal processability of the plexiglass plate, heats a plexiglass plate and blows it into a hemisphere, then the two hemispheres are bonded to form a whole, and finally inside or outside the ball Spray a coat of rear projection screen pai...

AI Technical Summary

Problems solved by technology

The feature of this method is that the production is simple and easy to operate, and the yield is high, but the disadvantage is that when the two hemispheres are combined, there is an obvious seam, which is just in the middle of the ball, which affects the projection effect.

[0005] 2. The inflatable ball adopts the method of beach balls, cuts the rear projection soft screen material into melon skin pieces, and then performs high-frequency welding to form a whole ball. The characteristic of the modified method is that it is easy to carry and hoisting. has many seams

[0006] 3. There is also a method of injecting two standard hemispheres first, and then processing the largest circle of each hemisphere into a 45-degree bevel for butt bonding, and finally spraying on the inside or outside A layer of rear projection screen paint, this method is also a method of butt bonding of two petals. First, there is a 45-degree bevel to hide some bad effects of the seam. The disadvantage is that it cannot be used for large-diameter balls. Because the injection molding process determines that the diameter of the product will not be too large, at the same time, there is still a dark gap between the two petals, which affects the appearance of the product. At the same time, the method of spraying screen paint inside or outside has a great impact on the process and equipment. The requirements are very high, which increases the production cost of the product

[0007] To sum up, none of the existing methods for making rear-projection screen balls can complete the production of a seamless sphere and achieve the perfect effect of product use.

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