Method for producing optical sheet, and optical sheet

Abstract

The purpose of the invention is to provide an optical piece manufacture method and an optical piece which is manufactured through the method. With the method, a thin optical piece with uniformly distributed thickness can be manufactured with perfect thickness and precision and perfect figuration and transfer printing property. The invention relates to an optical piece manufacture method which belongs to a method, through which resin (15) extruded by a mould (11) is pressurized between a touch pressure roller (12) and a figuration roller (13) and passes through the touch pressure roller and the figuration roller to manufacture an optical piece. More specifically, the temperature of the resin extruded by the mould (11) is from 250 DEG C to 290 DEG C and the forming speed is 8 to 40 meters per minute. In addition, the air interstice between the mould (11) and the fastening position of the touch pressure roller and the figuration roller (13) is below 100 millimeters and the touch pressure roller (12) adopts an elastic roller with the radial deformation value above 0.01percent of the diameter of the elastic roller when the line pressure is 30 kilograms per centimeter.

Description

technical field [0001] The present invention relates to a manufacturing method of an optical sheet and a manufacturing method of an optical sheet and a lenticular lens sheet. Background technique [0002] In the existing optical sheet manufacturing method, the sheet-shaped resin material extruded from the extrusion die passes through the gap between them while being pressed by a pair of engraved / mirror metal rollers, and the resin sheet is manufactured. . With this manufacturing method, when manufacturing a sheet having an optical function, it is required that a certain degree of thickness uniformity can be achieved by pressing pressure of a rigid roll. Furthermore, it is required to be able to transfer the smooth surface, surface shape, etc. necessary for realizing the optical function from the reverse pattern provided on the mold roll to the sheet at a certain shaping rate. [0003] In recent years, there has been a demand for thinner sheets for optical use. One of the ...

AI Technical Summary

Problems solved by technology

That is, the light incident on the lenticular lens sheet 102 is incident on both the lens portion 1021 and the transparent support 1022 to be refracted, and due to the difference in their refractive indices, uneven hue may sometimes occur.

Also, their transparency is sometimes limited due to their different refractive indices

[0018] In addition, since the materials of the lens portion 1021 and the transparent support 1022 are different, chipping is easily formed, and shapeability is also limited.

[0019] As described above, in the conventional optical sheet manufacturing method, when using a rigid roll, although it is possible to form an optically functional shape, it is difficult to manufacture an optical sheet with a uniform thickness distribution with good thickness accuracy. of

On the other hand, when an elastic roll is used, although a thin sheet with a uniform thickness distribution can be produced with good thickness accuracy, it cannot obtain formability and transferability sufficient for use in optical applications.

Therefore, there is a problem that the thickness accuracy of the optical sheet and the accuracy of formability and transferability cannot be achieved at the same time.

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