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71. 发明授权

US06618116B1 Optical head device and a diffraction element suitable for the device, and a method of manufacturing the diffraction element and the optical head device 有权
$Optical head device and a diffraction element suitable for the device, and a method of manufacturing the diffraction element and the optical head device$
标题翻译：光头装置和适用于该装置的衍射元件，以及制造衍射元件和光头装置的方法
公开(公告)号：US06618116B1
公开(公告)日：2003-09-09
申请号：US09509532
申请日：2000-03-31
申请人： Koichi Murata , Hiromasa Sato
发明人： Koichi Murata , Hiromasa Sato
IPC分类号： G02F113
CPC分类号： G11B7/1353 , G02B5/1833 , G11B11/10543
摘要： In order to read out information even from an optical recording medium having birefringence, of a diffracting element comprising an optical material forming a diffraction grating 21 having a cross-sectional shape of projections and recesses, and another optical material 22 filled at least in the recesses of the diffraction grating 21, at least one of the above two types of optical materials 21 and 22 shows birefringence, and the other optical material 22 has a refractive index which is different from both the ordinary refractive index and the extraordinary refractive index of said one optical material 21 showing birefringence. Further, in order to obtain a diffracting element of polarization type having a high diffraction efficiency and a uniform distribution in the plane, an alignment treatment film 11 is formed on one of two substrates 2 facing each other, spacers 12 to hold the space constant, and liquid crystal to be a thin film 1 of polymer liquid crystal, are sandwiched between the substrates 2 facing each other, the liquid crystal is aligned and cured by irradiation with light to obtain the thin film 1 of polymer liquid crystal, then one substrate is taken off, a grating having a cross-sectional shape of projections and recesses is formed on the thin film 1 of polymer liquid crystal, and the projections and recesses are filled with an isotropic medium.
摘要翻译：为了从具有双折射的光学记录介质读出信息，包括形成具有突起和凹陷的横截面形状的衍射光栅21的光学材料的衍射元件和至少填充在凹部中的另一种光学材料22 的衍射光栅21中，上述两种光学材料21和22中的至少一种表示双折射，另一种光学材料22的折射率与所述一种折射率和非常折射率的折射率不同另外，为了得到衍射效率高，平面分布均匀的偏光型衍射元件，在相互面对的两个基板2中的一个上形成取向处理膜11，将隔离物12 为了保持空间常数，并且液晶成为聚合物液晶的薄膜1，夹在其间 e基板2彼此面对，通过用光照射对液晶进行定向和固化，得到聚合物液晶薄膜1，然后取出一个基板，形成具有突起和凹陷的横截面形状的光栅在聚合物液晶薄膜1上，并用各向同性介质填充凸起和凹槽。

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