Polarizer
There is provided a polarizer having a non-polarization portion that can achieve the multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus, the polarizer being excellent in dimensional stability and external appearance of the non-polarization portion. A polarizer according to an embodiment of the present invention includes a resin film containing a dichromatic substance, wherein: the polarizer has a non-polarization portion at a predetermined position; and the non-polarization portion includes a thin-walled portion thinner than another portion of the resin film.
1. A polarizer, wherein:
the polarizer is a resin film comprising a dichroic substance and has a non-polarization portion at a predetermined position;
the non-polarization portion comprises a thin-walled portion thinner than another portion of the resin film, a step formed between the thin-walled portion and another portion of the resin film is 2 μm or less, and
the non-polarization portion has a content of an alkali metal and/or an alkaline earth metal of 3.6 wt % or less.
2. The polarizer according to claim 1 , wherein the polarizer has a thickness of 10 μm or less.
3. The polarizer according to claim 1 , wherein the non-polarization portion comprises a low-concentration portion having a content of the dichroic substance lower than that of the another portion of the resin film.
4. The polarizer according to claim 3 , wherein the content of the dichroic substance of the non-polarization portion is 1.0 wt % or less.
5. The polarizer according to claim 1 , wherein the non-polarization portion has a content of the dichroic substance of 1.0 wt % or less.
6. The polarizer according to claim 1 , wherein the non-polarization portion has a transmittance of 50% or more.
7. The polarizer according to claim 1 , wherein the non-polarization portion has a transmittance of 90% or more.
8. The polarizer according to claim 1 , wherein the resin film comprises a polyvinyl alcohol-based resin film containing iodine.
9. A polarizing plate, comprising:
the polarizer of claim 1 ; and
a protective film arranged on at least one side of the polarizer.
10. An image display apparatus, comprising the polarizer of claim 1 , wherein the non-polarization portion is arranged at a position corresponding to a camera portion.
11. An image display apparatus, comprising the polarizing plate of claim 9 , wherein the non-polarization portion is arranged at a position corresponding to a camera portion.
12. A polarizer, wherein:
the polarizer is a polyvinyl alcohol-based resin film comprising iodine, having a thickness of 10 μm or less and has a non-polarization portion at a predetermined position;
the non-polarization portion comprises a thin-walled portion thinner than another portion of the resin film, a step formed between the thin-walled portion and another portion of the resin film is 2 μm or less;
the non-polarization portion has a content of iodine of 1.0 wt % or less and has a content of an alkali metal and/or an alkaline earth metal of 3.6 wt % or less; and
the non-polarization portion has a transmittance of 50% or more.
13. The polarizer according to claim 1 , wherein the polarizer has a thickness of 5 μm or less.
14. The polarizer according to claim 12 , wherein the polarizer has a thickness of 5 μm or less.