Patent ID: 7986608
Filing Date: 2011-07-26
Classification: G02B,G11B

Abstract:
1. A laminated wave plate including a first wave plate having a phase difference of Γ 1 and a second wave plate having a phase difference of Γ 2 with respect to a wavelength λ, the first wave plate and the second wave plate being bonded together so that an optical axis of the first wave plate and an optical axis of the second wave plate intersect each other to function as a quarter-wave plate as a whole, the laminated wave plate comprising following equations from (1) to (6): wherein θ 1 is an optic axis orientation of the first wave plate, θ 2 is an optic axis orientation of the second wave plate, Γ 11 a is a phase difference of the first wave plate at the wavelength λ 11 , Γ 12 a is a phase difference of the first wave plate at the wavelength Γ 12 , Γ 11 b is a phase difference of the second wave plate at the wavelength λ 11 , Γ 12 b is a phase difference of the second wave plate at the wavelength λ 12 , and each of λ 11 <λ<λ 12 , n 1 , and n 2 is a natural number starting from 1.