Sheet winding structure

Patent metadata

Field	Value
Publication number	US-9725269-B2
Application number	US-201514599565-A
Country	US
Kind code	B2
Filing date	Jan 19, 2015
Priority date	Oct 20, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The present invention discloses a sheet winding structure to reduce indentation transfer occurring because of sheet thickness or adhesive colloidality of the innermost layer of the sheet. The sheet winding structure comprises: a winding core having an outer surface, wherein the outer surface of the winding core comprises a recess thereon; and a sheet winded over the outer surface of the winding core, wherein a beginning portion of the sheet is disposed in the recess.

First claim

What is claimed is:

1. A sheet winding structure having a winding core having an outer surface for winding an optical sheet, wherein the outer surface of the winding core comprises a recess thereon, wherein the recess is formed by a sidewall and a bottom surface connected to the sidewall, wherein the optical sheet comprises a beginning portion disposed in the recess, wherein the beginning portion comprises a first major surface disposed on the bottom surface of the recess, a second major surface opposite to the first major surface and a thickness surface facing the sidewall of the recess, wherein the length of the sidewall of the recess is less than 0.35 millimeter and the bottom surface of the recess is a flat surface for placing the beginning portion of the optical sheet thereon so as to reduce the indentation transfer of the optical sheet winded over the outer surface of the winding core.

2. The sheet winding structure according to the claim 1 , wherein the outer surface of the winding core comprises a non-concave surface having a first edge and a second edge, wherein the first edge is connected to the sidewall of the recess and the second edge is connected to the bottom surface of the recess.

3. The sheet winding structure according to the claim 1 , wherein the sidewall of the recess is substantially perpendicular to the bottom surface of the recess.

4. The sheet winding structure according to the claim 1 , wherein the extending plane of the sidewall of the recess passes the central axis of the winding core.

5. The sheet winding structure according to the claim 1 , wherein the extending plane of the sidewall of the recess does not pass the central axis of the winding core.

6. The sheet winding structure according to the claim 1 , wherein the optical sheet has a first thickness and the sidewall of the recess has a first length, wherein the first thickness is substantially equal to the first length.

7. The sheet winding structure according to the claim 1 , wherein the optical sheet has a first thickness and the sidewall of the recess has a first length, wherein the first thickness is larger than the first length.

8. The sheet winding structure according to the claim 1 , wherein the optical sheet has a first thickness and the sidewall of the recess has a first length, wherein the difference between the first thickness and the first length is 0˜12% time the first length.

9. The sheet winding structure according to the claim 1 , wherein the optical sheet has a first thickness and the sidewall of the recess has a first length, wherein the first thickness is larger than the first length by 0.01˜10 μm.

10. The sheet winding structure according to the claim 1 , wherein the optical sheet has a first thickness and the sidewall of the recess has a first length, wherein the first thickness is smaller than the first length by 0.01˜10 μm.

11. The sheet winding structure according to the claim 1 , wherein an adhesive is disposed between the winding core and the optical sheet to fix the optical sheet to the bottom surface of the recess.

12. The sheet winding structure according to the claim 11 , wherein the optical sheet has a first thickness, the adhesive has a second thickness and the sidewall of the recess has a first length, wherein the sum of the first thickness and the second thickness is substantially equal to the first length.

13. The sheet winding structure according to the claim 11 , wherein the optical sheet has a first thickness, the adhesive has a second thickness and the sidewall of the recess has a first length, wherein the difference between the sum of the first thickness and the second thickness and the first length is 0˜12% time the first length.

14. The sheet winding structure according to the claim 11 , wherein the optical sheet has a first thickness, the adhesive has a second thickness and the sidewall of the recess has a first length, wherein the sum of the first thickness and the second thickness is larger than the first length by 0.01˜10 μm.

15. The sheet winding structure according to the claim 11 , wherein the optical sheet has a first thickness, the adhesive has a second thickness and the sidewall of the recess has a first length, wherein the sum of the first thickness and the second thickness is smaller than the first length by 0.01˜10 μm.

16. The sheet winding structure according to the claim 11 , wherein the adhesive is a double-side adhesive tape.

17. The sheet winding structure according to the claim 1 , wherein the winding core is a tube body.

18. The sheet winding structure according to the claim 1 , wherein the optical sheet is a non-metal optical sheet.

19. The sheet winding structure according to the claim 1 , wherein the recess is formed by removing a portion of a cylindrical core.

20. A sheet winding structure having a winding core having an outer surface for winding an optical sheet, wherein the outer surface of the winding core comprises an L-type or V-type recess thereon, wherein the L-type or V-type recess is formed by a sidewall and a bottom surface connected to the sidewall, wherein the optical sheet comprises a beginning portion disposed in the recess, wherein the beginning portion comprises a first major surface disposed on the bottom surface of the recess, a second major surface opposite to the first major surface and a thickness surface facing the sidewall of the recess, wherein the length of the sidewall of the recess is less than 0.35 millimeter and the bottom surface of the recess is a flat surface for placing the beginning portion of the optical sheet thereon so as to reduce the indentation transfer of the optical sheet winded over the outer surface of the winding core.

21. The sheet winding structure according to the claim 20 , wherein the outer surface of the winding core comprises a non-concave surface having a first edge and a second edge, wherein the first edge is connected to the sidewall of the recess and the second edge is connected to the bottom surface of the recess.

22. The sheet winding structure according to the claim 20 , wherein the sidewall of the recess is substantially perpendicular to the bottom surface of the recess.

23. The sheet winding structure according to the claim 20 , wherein an adhesive is disposed between the winding core and the optical sheet to fix the optical sheet to the bottom surface of the recess.

24. The sheet winding structure according to the claim 20 , wherein the optical sheet has a first thickness and the sidewall of the recess has a first length, wherein the difference between the first thickness and the first length is 0˜12% time the first length.

25. The sheet winding structure according to the claim 20 , wherein the optical sheet is a non-metal optical sheet.

26. A sheet winding structure having a winding core having an outer surface for winding an optical sheet, wherein the outer surface of the winding core comprises a recess thereon, wherein the recess is formed by a sidewall and a bottom surface connected to the sidewall, wherein the optical sheet comprises a beginning portion disposed in the recess, wherein the beginning portion comprises a first major surface disposed on the bottom surface of the recess, a second major surface opposite to the first major surface and a thickness surface facing the sidewall of the recess, wherein the length of the sidewall of the recess is less than 0.35 millimeter and the bottom surface of the reces

Assignees

• Ubright Optronics Corp

Inventors

• Cheng Kuo Wei
• Lai Chien Chih

Classifications

• B65H75/28

  Arrangements for positively securing ends of material · CPC title

• B65H2701/515

  assembled from parts made of different materials · CPC title

• B65H18/28 Primary

  Wound package of webs · CPC title

• B65H2701/1752

  Polymer film · CPC title

• B65H75/10

  without flanges, e.g. cop tubes · CPC title