公开(公告)号：US5793407A

公开(公告)日：1998-08-11

申请号：US507914

申请日：1995-07-27

Applicant: Tae-seok Park ,  Chul-woo Lee ,  Jang-hoon Yoo

Inventor： Tae-seok Park ,  Chul-woo Lee ,  Jang-hoon Yoo

IPC: G11B7/00 ,  G02B27/58 ,  G11B7/0045 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135 ,  B41J2/47

CPC classification number: B82Y10/00 ,  G02B27/58 ,  G11B7/122 ,  G11B7/1367 ,  G11B7/1381 ,  G11B7/1387 ,  G11B2007/13727

Abstract: A high density recording method for performing high density recording by reducing a light spot size in an optical pickup for recording information by scanning an optical disk with the light spot, spatially controlling the phase or the intensity of light being focused within the optical focal length of an objective lens by employing a diffraction optical element so as to form on the optical disk a light spot whose diameter is reduced according to the width of the portion for controlling the phase or intensity of the light. The distribution of the optical intensity is variable depending on the distance between the diffraction optical element and the optical disk, to thereby enable theoretically forming a limitlessly small light spot, and actually, greatly increase the recording capacity. The diffraction optical element can be used as a floating slider in an optical pickup having a swing arm.

Abstract translation: 一种高密度记录方法，用于通过用光斑扫描光盘来减少用于记录信息的光学拾取器中的光点尺寸来进行高密度记录，空间地控制聚焦在光焦度的光焦度内的光的相位或强度 通过采用衍射光学元件在物镜上形成直径根据用于控制光的相位或强度的部分的宽度而减小的光斑的物镜。 光强度的分布根据衍射光学元件和光盘之间的距离而变化，从而能够在理论上形成无限小的光斑，实际上大大提高了记录容量。 衍射光学元件可以用作具有摆臂的光学拾取器中的浮动滑块。

公开(公告)号：US5629514A

公开(公告)日：1997-05-13

申请号：US458165

申请日：1995-06-02

Applicant: Chul-woo Lee ,  Chong-sam Chung ,  Jang-hoon Yoo ,  Kyung-hwa Rim

Inventor： Chul-woo Lee ,  Chong-sam Chung ,  Jang-hoon Yoo ,  Kyung-hwa Rim

IPC: G11B7/09 ,  G11B7/135 ,  G01J1/20 ,  G11B7/00

CPC classification number: G11B7/1356 ,  G11B7/0908 ,  G11B7/0917 ,  G11B7/0943 ,  G11B2007/0919

Abstract: A focus error detector for detecting a signal representing a degree of a focus error of an objective lens with respect to an optical disk in an optical pickup, in order to eliminate errors due to an optical axis shift or tilt of the reflected light reflected from the optical disk, includes a diffraction device for diffracting and splitting the reflected light reflected. The focus error detector a critical angle reflector having critical angle reflecting planes for reflecting the two diffracted light rays at two critical angles, two bi-segmented photo-detectors for receiving the two diffracted light rays reflected from the critical angle reflector, respectively, and detecting signals depending on the received light amount, and a circuit for differentiating and summing each signal of the two bi-segmented photo-detectors so as to offset the light amount difference due to the tilt or shift of the reflected light and outputting a desired signal. Therefore, only an original focus error signal is output, irrespective of an optical shift or tilt of the reflected light, so that malfunction of the optical pickup is prevented and clean recording and reproduction is enabled.

Abstract translation: 一种聚焦误差检测器，用于检测表示物镜相对于光学拾取器中的光盘的聚焦误差的程度的信号，以便消除由于光学偏移反射的反射光的光轴偏移或倾斜引起的误差 光盘包括用于衍射和分裂反射的反射光的衍射装置。 聚焦误差检测器，具有用于以两个临界角度反射两个衍射光线的临界角反射面的临界角反射镜，分别用于接收从临界角反射器反射的两个衍射光线的两个双段光电检测器， 信号，以及用于对两个双分段光电检测器的每个信号进行微分和求和以便偏移由于反射光的倾斜或偏移引起的光量差异并输出所需信号的电路。 因此，不管反射光的光学偏移或倾斜如何，仅输出原始聚焦误差信号，从而防止光学拾取器的故障，并且能够进行清洁的记录和再现。

公开(公告)号：US5587976A

公开(公告)日：1996-12-24

申请号：US555967

申请日：1995-11-13

Applicant: Jang-hoon Yoo ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Chul-woo Lee

Inventor： Jang-hoon Yoo ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Chul-woo Lee

IPC: G11B11/10 ,  G11B5/00 ,  G11B5/012 ,  G11B5/35 ,  G11B5/596 ,  G11B7/12 ,  G11B11/105 ,  G11B7/00

CPC classification number: G11B11/10543 ,  G11B5/00 ,  G11B5/012 ,  G11B5/35 ,  G11B5/596

Abstract: An optical pickup for an optical magnetic disc includes a light source, a grating for diffracting the light into a main light beam and auxiliary light beams, a plurality of magnetic dipole tips arranged above the optical magnetic disc so as to interact with the magnetic signal stored in the optical magnetic disc. Also, a plurality of mirror members each attached to the rear of each magnetic dipole tips are for reflecting the light incident on the mirror member, and a photodetector for detecting track errors and the stored information by receiving the light reflected from the mirror members are provided, thereby detecting the error signal and reproducing information by the interaction with the magnetic dipoles of the disc so that the recording density can be increased without increasing the conventional land and groove areas in the disc.

Abstract translation: 一种用于光磁盘的光拾取器包括光源，用于将光衍射成主光束的光栅和辅助光束，布置在光磁盘上方的多个磁偶极子尖端，以便与存储的磁信号相互作用 在光磁盘中。 此外，各个安装在每个磁偶极头的后面的多个镜构件用于反射入射在镜构件上的光，并且设置用于检测轨道错误的光电检测器和通过接收从镜构件反射的光的存储信息 从而通过与盘的磁偶极子的相互作用来检测误差信号和再现信息，从而可以增加记录密度，而不增加盘中常规的平台和凹槽区域。