Method for producing a lens pattern on roll
The present disclosure generally relates to a method for producing lens patterns on a roll which is used to produce optical films wherein the method comprises forming a resin film on a roll comprising a plated layer which has been surface-plated with copper (Cu) or nickel (Ni); producing a preliminary lens pattern by striking the surface of the resin film on the roll with a chisel; etching with an etching solution the roll having the preliminary lens pattern formed thereon; and removing the resin film, and a roll for producing optical films comprising lens patterns formed thereon by the same method.
1. A method for producing a lens pattern on a roll, comprising:
forming a resin film on the roll, wherein the resin film is made from polyimide resin, acrylic resin or urethane resin, and wherein the roll comprises a layer plated with copper (Cu) or nickel (Ni);
striking the resin film with a chisel mounted on a sonic vibrator to produce a preliminary lens pattern in the resin film and the roll;
etching with an etching solution the resin film and the roll having the preliminary lens pattern; and
removing the resin film,
wherein the method further comprises performing electrolytic plating using chromium (Cr) or electroless plating using nickel (Ni) after the etching with the etching solution or the removing the resin film.
2. The method of claim 1 , wherein the electrolytic plating or the electroless plating occurs after removing the resin film.
3. The method of claim 1 , wherein when the surface of the resin film on the roll is struck with a chisel, while the roll is rotating.
4. The method of claim 1 , wherein the chisel has a blade angle of at least about 80°.
5. The method of claim 4 , wherein the chisel has a blade angle of at least about 100°.
6. The method of claim 4 , wherein the chisel has a blade angle of at least about 120°.
7. The method of claim 1 , wherein the chisel comprises diamond.
8. The method of claim 1 , wherein the resin film is made from polyimide resin.
9. The method of claim 1 , wherein the electrolytic plating is carried out with chromium (Cr).
10. The method of claim 1 , wherein the resin film is made from polyimide resin and the electrolytic plating is carried out with chromium (Cr).