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US 2019/0293852 A1Published application
Wide-band wavelength film, method for producing same, and method for producing circular polarization film
AssigneeZeon Corporation
InventorsTakao KOBAYASHI, Shunsuke TAKAGI
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Abstract
A method for producing a broadband wavelength film including, in this order: a first step of preparing a layer (A) as a long-length obliquely stretched film; a second step of forming on the layer (A) a layer (B) of a resin having a negative intrinsic birefringence to obtain a multilayer film; and a third step of stretching the multilayer film to obtain a long-length broadband wavelength film including a λ/2 layer and a λ/4 layer.
Claims24
A method for producing a broadband wavelength film comprising, in this order:
- a first step of preparing a layer (A) as a long-length obliquely stretched film;
- a second step of forming on the layer (A) a layer (B) of a resin having a negative intrinsic birefringence to obtain a multilayer film;
- and
- a third step of stretching the multilayer film to obtain a long-length broadband wavelength film including a λ/2 layer and a λ/4 layer.
1 more element
A long-length broadband wavelength film being a co-stretched film comprising:
- a λ/2 layer having a slow axis that forms an angle of 67.5°±10° with respect to a width direction thereof;
- and
- a λ/4 layer having a slow axis that forms an angle of 0°±20° with respect to the width direction.
Dependencies are inferred from the claim text.