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发明授权
CN101408635B 叠层波长板以及使用该叠层波长板的光拾取装置 失效 - 权利终止 转让

叠层波长板以及使用该叠层波长板的光拾取装置
摘要：
本发明提供一种叠层波长板以及使用该叠层波长板的光拾取装置，该叠层波长板能对应多种不同的波长，能将相位差变动抑制为最小限度。若设波长为λA的光在第一波长板的相位差为ΓA1，设在第二波长板的相位差为ΓA2，设波长为λB的光在第一波长板的相位差为ΓB1，设在第二波长板的相位差为ΓB2，设第一波长板的面内方位角θ1为—21°，设第二波长板的面内方位角θ2为45°，设波长为λA的光的正常光线折射率noA与异常光线折射率neA的差为ΔnA，设波长为λB的光的正常光线折射率noB与异常光线折射率neB的差为ΔnB，则该叠层波长板通过如下条件确定：ΓA1＝360°+360°×2NA，ΓA2＝180°+360°×NA，ΓB1＝360°×2NB，ΓB2＝360°×NB，NB＝(ΔnB/ΔnA)×(λA/λB)×(0.5+NA)。
摘要（英）：

A laminated wave plate that corresponds to a plurality of wavelengths including at least two wavelengths of lambdaA and lambdaB, and includes a first wave plate disposed on an incident side and a second wave plate disposed on an emitting side, the first wave plate and the second wave plate being laminated in such a manner that their optical axes are intersected each other, includes the following equations: GammaA1=360 DEG +360 DEG *2NA; GammaA2=180 DEG +360 DEG *NA; GammaB1=360 DEG *2NB; GammaB2=360 DEG xNB; and NB=(DeltanB/DeltanA)x(lambdaA/lambdaB)x(0.5+NA), in which GammaA1 is a phase difference of the wavelength lambdaA at the first wave plate, GammaA2 is a phase difference of the wavelength lambdaA at the second wave plate, GammaB1 is a phase difference of the wavelength lambdaB at the first wave plate, GammaB2 is a phase difference of the wavelength lambdaB at the second wave plate, theta1 is an in-plane azimuth of the first wave plate, theta2 is an in-plane azimuth of the second wave plate, DeltanA is a birefringent difference that is a difference (neA-noA) between a normal ray refractive index noA and an abnormal ray refractive index neA of the wavelength lambdaA, and DeltanB is a birefringent difference that is a difference (neB-noB) between a normal ray refractive index noB and an abnormal ray refractive index neB of the wavelength lambdaB, under conditions of theta1=-21 DEG, and theta2=45 DEG.

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