发明名称 |
WAVELENGTH SELECTIVE DIFFRACTION ELEMENT WITH AN ORGANIC PIGMENT AND OPTICAL HEAD DEVICE |
摘要 |
<p>An optical head device having an optical element capable of transmitting without diffracting light having a wavelength emitted from a two-wavelength semiconductor laser and capable of diffracting light having another wavelength, to provide high utilization efficiency of light in a stable manner. <??>For this purpose, a wavelength-selective diffraction element 1A comprising a transparent substrate having a front surface on which a grating having a periodically recessed and projected shape in cross section is formed and a filling member 13A filled in the concavo-convex portion 12A of the grating wherein the concavo-convex portion of the grating is provided with an organic pigment having the absorption edge of light in a region having a shorter wavelength than the wavelength lambda 1, and the concavo-convex member and the filling member have the same refractive index with respect to either one of light having a wavelength lambda 1 and light having a wavelength lambda 2, and they have different refractive indices with respect to the other light having a wavelength, is disposed between the light source and the objective lens of the optical head device. <IMAGE></p> |
申请公布号 |
EP1361461(B1) |
申请公布日期 |
2010.06.16 |
申请号 |
EP20020711419 |
申请日期 |
2002.02.08 |
申请人 |
ASAHI GLASS COMPANY LTD. |
发明人 |
GOTO, RYUICHIRO;HOTAKA, HIROKI;OOI, YOSHIHARU;NOZAWA, REIKO;SHIMODAIRA, NORIAKI;MURAKAMI, RYOTA |
分类号 |
G02B5/18;G11B7/1353;G02B5/20;G02B27/10;G11B7/00;G11B7/09 |
主分类号 |
G02B5/18 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|