Polarizer, polarizing plate, and image display apparatus
A polarizer according to an embodiment of the present invention includes a resin film having a thickness of 13 μm or less and containing iodine. The resin film has formed therein a low-concentration portion having a content of the iodine lower than that of another portion.
1. A polarizer, comprising a resin film having a thickness of 13 μm or less and containing iodine, wherein the resin film has formed therein a portion having a content of the iodine lower than that of another portion, and
wherein the content of the iodine in the portion having a content of the iodine lower than that of another portion is 1.0 wt % or less.
2. The polarizer according to claim 1 , wherein the polarizer has a single axis transmittance of 42.0% or more and a polarization degree of 99.95% or more in the another portion.
3. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion has a transmittance of 50% or more.
4. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion has a substantially circular shape having a diameter of 10 mm or less.
5. The polarizer according to claim 1 , wherein the thickness of the resin film is 8 μm or less.
6. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion corresponds to a camera hole portion of an image display apparatus on which the polarizer is mounted.
7. The polarizer according to claim 1 , wherein the portion having a content of the iodine lower than that of another portion is formed by bringing a basic solution into contact with the resin film containing the iodine.
8. The polarizer according to claim 7 , wherein the basic solution comprises an aqueous solution of sodium hydroxide having a concentration of 1 wt % or more.
9. A polarizing plate, comprising the polarizer of claim 1 .
10. An image display apparatus, comprising the polarizing plate of claim 9 .
11. A method of producing the polarizer of claim 1 , the method comprising bringing a basic solution into contact with a resin film having a thickness of 13 μm or less and containing iodine.
12. The production method according to claim 11 , wherein the basic solution has a temperature of 20° C. or more.
13. The production method according to claim 11 , further comprising bringing an acidic solution into contact with a portion of the resin film with which the basic solution has been brought into contact.
14. The production method according to claim 11 , wherein the resin film comprises a resin layer formed on a substrate.
15. The production method according to claim 14 , wherein the resin layer comprises an applied layer.