公开(公告)号：US06266315B1

公开(公告)日：2001-07-24

申请号：US09196111

申请日：1998-11-20

Applicant: Chul-Woo Lee ,  Chong-Sam Chung ,  Yong-Moon Lee ,  Cheol-Sung Yeon ,  Joong-Eon Seo ,  Young-Min Cheong ,  Dong-Ho Shin ,  Kun-Mo Cho ,  Pyong-Yong Seong ,  Jang-Hoon Yoo

Inventor： Chul-Woo Lee ,  Chong-Sam Chung ,  Yong-Moon Lee ,  Cheol-Sung Yeon ,  Joong-Eon Seo ,  Young-Min Cheong ,  Dong-Ho Shin ,  Kun-Mo Cho ,  Pyong-Yong Seong ,  Jang-Hoon Yoo

IPC: G11B700

CPC classification number: G11B7/1387 ,  G11B7/08576 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/122 ,  G11B7/1374 ,  G11B7/22 ,  G11B7/24 ,  G11B11/10547 ,  G11B11/10554 ,  G11B11/1058 ,  G11B11/10584 ,  G11B2007/13725

Abstract: 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 reading information 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 10 Gbit/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.

公开(公告)号：US6088170A

公开(公告)日：2000-07-11

申请号：US14625

申请日：1998-01-28

Applicant: Chul-Woo Lee ,  Pyong-Yong Seong ,  Tae-Kyung Kim

Inventor： Chul-Woo Lee ,  Pyong-Yong Seong ,  Tae-Kyung Kim

IPC: G02B27/09 ,  G11B7/135 ,  H01S3/00 ,  H01S5/00 ,  H01S5/022 ,  G02B13/18 ,  G11B7/00

CPC classification number: G02B19/0085 ,  G02B19/0014 ,  G02B19/0052 ,  G02B27/09 ,  G02B27/0966 ,  G11B7/1365 ,  G11B7/1372 ,  G11B7/1398 ,  H01S5/005

Abstract: A beam-shaping optical system includes a light source, a plurality of plates, and a cylindrical lens disposed between the light source and the plurality of plates, wherein the plurality of plates and the cylindrical lens have an optical feature in which the light output from the light source is beam-shaped to have a desired shape in the cross-section of the light beam. An optical pickup using the beam-shaped light which is diverged by the optical system can obtain convergence light reflected from an optical storage medium. Since the convergence light transmitted through only one plate has astigmatism as it is, a separate lens is not used for light detection and uses a photo detector adapted for employing an astigmatic method, to perform a focussing servo.

Abstract translation: 光束整形光学系统包括光源，多个板和设置在光源和多个板之间的柱面透镜，其中多个板和柱面透镜具有光学特征，其中从 光源在光束的横截面中具有波束形状以具有期望的形状。 使用由光学系统分散的束状光的光学拾取器可以获得从光学存储介质反射的会聚光。 由于仅通过一个板透射的会聚光像散像一样，所以不使用单独的透镜来进行光检测，并且使用适于采用散光法的光检测器来执行聚焦伺服。

公开(公告)号：US6081497A

公开(公告)日：2000-06-27

申请号：US8315

申请日：1998-01-20

Applicant: Pyong-Yong Seong

Inventor： Pyong-Yong Seong

IPC: G11B7/08 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

CPC classification number: G11B7/1356 ,  G11B7/127 ,  G11B7/135 ,  G11B7/1362 ,  G11B7/1365 ,  G11B2007/0006

Abstract: An optical pickup is used for two kinds of disks, each of which uses a different wavelength of light. The optical pickup includes first and second light sources for individually emitting first and second light beams which have a respectively different wavelength from each other and are identically linearly polarized, a polarizing beam splitter, a quarter-wave plate and a total reflection element. The polarizing beam splitter, the quarterwave plate and the total reflection element are arranged so that a first optical path is formed in which the first light beam emitted from the first light source proceeds toward the loaded disk via the polarizing beam splitter and the objective lens and the first light beam reflected from the loaded disk proceeds toward the first light source via the objective lens and the polarizing beam splitter, and so that a second optical path is formed in which the second light beam emitted from the second light source proceeds toward the loaded disk via the polarizing beam splitter, the quarter-wave plate, the total reflection element, the quarter-wave plate, the polarizing beam splitter and the objective lens and the second light beam reflected from the loaded disk proceeds toward the second light source via the objective lens, the polarizing beam splitter, the quarter-wave plate, the total reflection element, the quarter-wave plate and the polarizing beam splitter. Thus, the optical pickup can be made compact and at a low cost. Also, the polarizing beam splitter, the quarter-wave plate and the total reflection element have respectively high light utilization efficiencies, which are appropriate for a recording and reproducing optical pickup.

Abstract translation: 光拾取器用于两种光盘，每种光盘使用不同波长的光。 光学拾取器包括第一和第二光源，用于分别发射具有彼此不同的波长并且相同线性偏振的第一和第二光束，偏振分束器，四分之一波片和全反射元件。 偏振分束器，四分之一波片和全反射元件被布置成使得形成第一光路，其中从第一光源发射的第一光束经由偏振分束器和物镜朝向装载的光盘进行， 从装载的光盘反射的第一光束经由物镜和偏振光束分离器朝向第一光源进行，并且形成第二光路，其中从第二光源发射的第二光束朝向负载 通过偏振分束器，四分之一波片，全反射元件，四分之一波片，偏振分束器和物镜以及从加载盘反射的第二光束经由 物镜，偏振分束器，四分之一波片，全反射元件，四分之一波片和偏振光 分离器 因此，可以使光拾取器紧凑并且成本低廉。 此外，偏振光束分离器，四分之一波片和全反射元件分别具有适用于记录和再现光学拾取器的高的光利用效率。