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CN101852882B 叠层波长板、光拾取装置、偏振光变换元件及投影型显示装置 有权 转让

叠层波长板、光拾取装置、偏振光变换元件及投影型显示装置
摘要：
叠层波长板、光拾取装置、偏振光变换元件及投影型显示装置。其课题在于，在以第1及第2波长板的光轴相互交叉的方式使该第1及第2波长板重合而成的叠层波长板中，在400～800nm这一宽波段的整个波长范围内将变换效率的劣化抑制为最小，实现1或接近于1的良好的变换效率。在设第1及第2波长板(12、13)相对于设计波长λO的相位差为Γ1＝Γ2＝180°、光轴的面内方位角为θ1、θ2，入射到叠层1/2波长板(11)的线偏振光的偏振方向与射出的线偏振光的偏振方向所成的角度为ψ、光轴调节量为a时，θ1＝ψ/4+a、θ2＝3ψ/4-a、0＜a＜amax，光轴调节量最大值amax根据设计波长λO而满足规定的多项式。
摘要（英）：

The invention provides a laminated wave plate including first and second wave plates overlapping with each other so that optical axes thereof intersect each other, which can suppress as much as possible the decrease in conversion efficiency in a wavelength range with a broader bandwidth and realize an excellent conversion efficiency of 1 or close to 1 all over the wavelength range with a broad bandwidth of about 400 to 800 nm. A laminated wave plate includes a first wave plate with a phase difference of [Gamma]1=180 DEG with respect to a designed wavelength [lambda]0 and a second wave plate with a phase difference of [Gamma]2=180 DEG, the laminated wave plate converting an incident linearly-polarized beam into a linearly-polarized beam obtained by rotating a polarization plane of the incident linearly-polarized beam by a predetermined angle [phi] and outputting the converted linearly-polarized beam. When in-plane bearing angles formed by the polarization plane of the incident linearly-polarized beam and optical axes of the first and second wave plates are represented by [theta]1 and [theta]2 and an optical axis adjustment amount is represented by a, the following expressions are satisfied: [theta]1=[phi]/4+a; and [theta]2=3[phi]/4-a, 0

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