Method for making prism sheet

Details Method for making prism sheet Method for making prism sheet

2010-03-31

2010-10-12

Duong, Thoi V (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Lens or prism separate from projection system

C349S062000, C349S095000, C362S620000, C362S626000, C264S002500, C264S219000, C409S132000

Reexamination Certificate

active

07812897

ABSTRACT:
A method for making a prism sheet includes: providing a cutting device comprising a cutter, a table plate, and a control unit, the table plate controlled to move up and down by the control unit, and the cutter having a blade rotatable; providing a mold insert preform on the table plate, the mold insert preform having a flat surface; moving the cutter to etch the flat surface of the mold insert preform along a first direction, and simultaneously driving the table plate to move up and down by the control unit in a first predetermined manner to form first elongated depressions in the flat surface; moving the cutter to etch the flat surface of the mold insert preform along a second direction to form second elongated depressions in the flat surface, thereby forming a mold insert; using the mold insert to form the prism sheet by injection molding method.

REFERENCES:
patent: 6898015 (2005-05-01), Yoshikawa et al.
patent: 7035507 (2006-04-01), Hayashi

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