发明名称 |
CATADIOPTRIC OPTICAL SYSTEM, OPTICAL PICKUP AND OPTICAL DISK DRIVE EMPLOYING THE SAME, AND OPTICAL DISK |
摘要 |
<p>An optical focusing system which uses a light beam emitted from a light source, includes a refractive surface on one side of the optical focusing system and having a first radius of curvature, a first reflection surface on the above one side, surrounding the refractive surface and having a second radius of curvature being different from the first radius of curvature, a transparent beam focusing surface on the other side of the optical focusing system, and a second reflection surface on the above other side and surrounding the beam focusing surface. The refractive surface refracts an incident light beam, the second reflection surface reflects a light beam refracted by the refractive surface toward the first reflection surface, and the first reflection surface focuses a laser light beam reflected from the second reflection surface on the beam focusing surface as a focused beam spot. The optical focusing system can be used in an optical pickup. The optical pickup uses the optical focusing system to generate, from a light beam e.g. laser light emitted from a light source, a beam spot used for recording or readinginformation to a recording medium. The optical pickup uses a near field effect provided by an optical focusing system according to the present invention, to allow a superior density of recording or reading. Further, the optical focusing system according to the invention can use a light beam having a beam diameter smaller than that of the laser beam used for an existing optical focusing system for forming a near field. Thus, the optical pickup according to the invention can record or read information on an optical disk having a surface recording density of 10Gbit/inch2 or more. Even if an incident light beam inclination occurs due to movement of the disk or the optical pickup, information can be recorded on or read from a disk accurately. Also, the assembly of the optical focusing system and the adjustment of the assembled optical focusing system are easily performed.</p> |
申请公布号 |
CA2278416(A1) |
申请公布日期 |
1999.06.03 |
申请号 |
CA19982278416 |
申请日期 |
1998.11.21 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
LEE, YONG-HOON;YEON, CHEOL-SUNG;SEO, JOONG-EON;CHO, KUN-HO;LEE, CHUL-WOO;SEONG, PYONG-YONG;YOO, JANG-HOON;CHUNG, CHONG-SAM;SHIN, DONG-HO;CHEONG, YOUNG-MIN |
分类号 |
G11B7/00;G02B27/10;G11B7/085;G11B7/09;G11B7/12;G11B7/135;G11B7/22;G11B7/24;G11B11/105;(IPC1-7):G11B7/135;G11B7/08 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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