发明名称 |
Laminated half-wave plate, polarizing converter, polarized light illumination device and light pickup device |
摘要 |
[Problem] To obtain a means for forming a laminated half-wave plate for a triple-wavelength compatible optical pickup device. [Solving Means] A first and a second wave plates using quartz crystal having birefringence are laminated together in such a manner that their optical axes intersect to form a laminated wave plate functioning as a half-wave plate as a whole. Phase differences of the first and the second wave plates relative to an ordinary ray and an extraordinary ray with respect to a predetermined wavelength lambda are set to be Gamma 1 and Gamma 2 , an order of a high-mode order is set to be a natural number n, whereby the high-order mode laminated half-wave plate is formed so as to satisfy: Gamma 1 =180°+360°xn; and Gamma 2 =180°+360°xn.
|
申请公布号 |
US2007291357(A1) |
申请公布日期 |
2007.12.20 |
申请号 |
US20070783398 |
申请日期 |
2007.04.09 |
申请人 |
EPSON TOYOCOM CORPORATION |
发明人 |
OTO MASAYUKI |
分类号 |
G02B27/28;G02B5/30 |
主分类号 |
G02B27/28 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|