公开(公告)号：US6114689A

公开(公告)日：2000-09-05

申请号：US299664

申请日：1999-04-27

Applicant: Kun-ho Cho ,  Jang-hoon Yoo ,  Yong-hoon Lee ,  Chul-woo Lee ,  Chong-sam Chung

Inventor： Kun-ho Cho ,  Jang-hoon Yoo ,  Yong-hoon Lee ,  Chul-woo Lee ,  Chong-sam Chung

IPC: G02B3/08 ,  G02B5/18 ,  G02B13/00 ,  G11B7/1374 ,  G02B3/00 ,  G11B7/12

CPC classification number: G11B7/1353 ,  G02B3/08 ,  G02B5/1876 ,  G11B7/122 ,  G11B7/1362 ,  G11B7/1374 ,  G11B7/1384 ,  G11B7/1387

Abstract: An optical pickup device includes a light module, emitting light and receiving light reflected from a recording medium, and a solid immersion lens (SIL) member disposed in an optical path between the light module and the recording medium. The SIL has a planar surface facing the recording medium and a plurality of elliptically curved surfaces opposite the recording medium. The elliptically curved surfaces have different radii of curvature arranged symmetrical with respect to a central axis for focusing the incident light to form a tight beam spot on a recording plane of the recording medium.

Abstract translation: 一种光学拾取装置，包括发光和接收从记录介质反射的光的光模块和设置在光模块和记录介质之间的光路中的固体浸没透镜（SIL）部件。 SIL具有面向记录介质的平面和与记录介质相对的多个椭圆曲面。 椭圆曲面具有相对于中心轴对称布置的不同的曲率半径，用于聚焦入射光以在记录介质的记录平面上形成紧束光斑。

公开(公告)号：US6081498A

公开(公告)日：2000-06-27

申请号：US14621

申请日：1998-01-28

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

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

IPC: G11B7/135 ,  G11B7/00 ,  G11B7/12 ,  G11B7/125

CPC classification number: G11B7/1365 ,  G11B7/13922 ,  G11B2007/0006

Abstract: An optical pickup is compatible with at least two types of optical recording media each using light beams having different wavelengths from one another and which are used for recording and reproducing information. The optical pickup includes a first laser light source for emitting a first light beam having a relatively long wavelength, and a second laser light source for emitting a second light beam having a relatively short wavelength. A beam splitting plate transmits the first light beam and reflects the second light beam toward a collimator. The collimator collimates the light beam incident from the beam splitting plate to transmit the collimated light beam into an objective lens. The objective lens is designed so that the second light beam is focused on the information recording surface of a second optical recording medium whose information recording surface is closer to the objective lens than the information recording surface of the first optical recording medium, to form an optical spot optimized to the second optical recording medium. The optical distance from the first laser light source to the information recording surface of a first optical recording medium whose information recording surface is relatively farther from the objective lens, is shorter than the optical distance from the second laser light source to the information recording surface of the second optical recording medium so that spherical aberration occurring when the first light beam is used is removed. An aberration correction plate is located on an optical path between the first laser light source and the beam splitting plate, and corrects an optical aberration occurring when the beam splitting plate is used.

Abstract translation: 光学拾取器与至少两种类型的光学记录介质兼容，每种光学记录介质使用彼此不同波长的光束并且用于记录和再现信息。 光学拾取器包括用于发射具有较长波长的第一光束的第一激光光源和用于发射具有较短波长的第二光束的第二激光光源。 分束板透射第一光束并将第二光束反射到准直仪。 准直器准直从分束板入射的光束，将准直光束传输到物镜中。 物镜被设计成使得第二光束聚焦在其信息记录表面比第一光学记录介质的信息记录表面更靠近物镜的第二光学记录介质的信息记录表面上，以形成光学 对第二光记录介质进行优化。 从第一激光光源到其信息记录表面相对远离物镜的第一光记录介质的信息记录表面的光学距离比从第二激光光源到信息记录表面的光学距离短 第二光学记录介质，使得当使用第一光束时发生的球面像差被去除。 像差校正板位于第一激光光源和分束板之间的光路上，并且校正当使用分束板时发生的光学像差。

公开(公告)号：US5777973A

公开(公告)日：1998-07-07

申请号：US761826

申请日：1996-12-06

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

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

IPC: G11B7/09 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/08 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135

CPC classification number: G11B7/1353 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1367 ,  G11B7/1381 ,  G11B2007/0006 ,  G11B2007/13727 ,  G11B7/0037 ,  G11B7/0909

Abstract: A reproducing/recording optical pickup compatible with discs having different thicknesses includes a transparent plate having a central portion formed with a diffraction grating pattern for diffracting the light travelling from the light source to the objective lens, and a transparent portion through which the light passes, and a photodetector having first and second light receiving portions. The zero-order transmitted light and the passing light are focused using all regions of the aperture of the objective lens with respect to a thin disc. The positive first-order diffracted light diffracted by the diffraction grating pattern of the transparent plate is focused onto a thick disc by partial regions of the objective lens. Then, the reflected lights thereof are detected by the first and second light receiving portions, respectively. Because signals for reproduction and servo for each disc are detected as the detection signals of the first and second light receiving portions, stable servo and noiseless reproduction are possible, irrespective of the thickness of the disc used.

Abstract translation: 与具有不同厚度的光盘兼容的再现/记录光学拾取器包括透明板，其具有形成有衍射光栅图案的中心部分，用于将从光源传播的光衍射到物镜，以及光通过的透明部分， 以及具有第一和第二光接收部分的光电检测器。 使用物镜的孔径的相对于薄盘的所有区域聚焦零级透射光和通过光。 由透明板的衍射光栅图案衍射的正一级衍射光被物镜的部分区域聚焦在厚盘上。 然后，其反射光分别由第一和第二光接收部分检测。 由于每个盘的再现和伺服信号被检测为第一和第二光接收部分的检测信号，所以与所使用的盘的厚度无关，可以进行稳定的伺服和无噪声再现。

公开(公告)号：US5703862A

公开(公告)日：1997-12-30

申请号：US587783

申请日：1995-12-26

Applicant: Chul-woo Lee ,  Jang-hoon Yoo

Inventor： Chul-woo Lee ,  Jang-hoon Yoo

IPC: G02B13/00 ,  G02B3/10 ,  G02B13/18 ,  G11B7/00 ,  G11B7/09 ,  G11B7/135

CPC classification number: G11B7/1374 ,  G11B2007/0006

Abstract: A dual-focus objective lens for an optical pickup which is compatible with both 0.6 mm and 1.2 mm disks is compensated in its aberration with respect to a light spot on a recording plane of the loaded disk and at least one of a light-receiving plane and a light-emitting plane of the dual focus objective lens has a first curvature unit and a second curvature unit whose curvature radii are different from each other. Incident light beams passing through the whole region of the first curvature unit and second curvature unit are focused onto the thinner disk, and parts of incident light beams passing through the region around the first curvature unit are focused onto the thicker disk. In the optical pickup having the dual focus objective lens, since the light is not divided, light efficiency is improved, thereby reproducing a signal with a high signal-to-noise ratio. Particularly, an optical pickup enabling recording as well as reproduction is obtained.

Abstract translation: 与0.6mm和1.2mm的光盘兼容的用于光学拾取器的双焦点物镜相对于装载盘的记录平面上的光斑的像差被补偿，并且光接收平面 并且双焦点物镜的发光面具有第一曲率单位和曲率半径彼此不同的第二曲率单位。 通过第一曲率单位和第二曲率单位的整个区域的入射光束被聚焦到较薄的盘上，并且穿过第一曲率单位周围的区域的入射光束的一部分聚焦在较厚的盘上。 在具有双重聚焦物镜的光学拾取器中，由于光不被分割，所以光效率提高，从而再现具有高信噪比的信号。 特别地，获得了能够进行记录和再现的光学拾取器。

公开(公告)号：US08848502B2

公开(公告)日：2014-09-30

申请号：US10441111

申请日：2003-05-20

Applicant: Chul-woo Lee ,  Jang-hoon Yoo

Inventor： Chul-woo Lee ,  Jang-hoon Yoo

IPC: G11B7/135 ,  G11B7/1353 ,  G11B7/1392 ,  G11B7/1374 ,  G11B7/1372 ,  G11B7/00

CPC classification number: G11B7/1374 ,  G11B7/1353 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: A recording/reproducing apparatus having an optical pickup device which is efficient in light use having little spherical aberration. The recording and/or reproducing apparatus includes an optical pickup having an objective lens, disposed opposite a disk, having a light passing region divided into central, intermediate and periphery regions corresponding to a near axis area, an intermediate axis area and a far axis area of incident light, where the curvature of the central and peripheral regions is optimized for a thin disk and that of the intermediate region is optimized for a thick disk, a light source irradiating light toward a disk through the objective lens; a photo detector for detecting light reflected from the disk, and a beam splitter, disposed between the objective lens and the light source, for transmitting light from the light source toward the objective lens and for diffracting light reflected from the disks toward the photo detector; and a processing unit to process an information signal to control the incident light generated by the light source, and to process the detected light from the photodetector. Therefore, the optical pickup device can be used for both compact disks (CDs) that are thick using light beam passing the near and intermediate regions of said objective lens, and digital video disks (DVDs) that are thin using light beam passing the near and far axis regions of said objective lens, and detect signals without picking up noise regardless of the thickness of the disk.

Abstract translation: 一种具有光学拾取装置的记录/再现装置，其具有很少的球面像差的光利用效率。 记录和/或再现装置包括具有与光盘相对设置的物镜的光学拾取器，具有被分成对应于近轴区域的中心，中间和周边区域的光通过区域，中间轴区域和远轴区域 入射光的中心区域和外围区域的曲率优化为薄盘，中间区域的曲率针对厚盘优化，光源通过物镜向盘照射光; 用于检测从光盘反射的光的光检测器和设置在物镜和光源之间的光束分离器，用于将光从光源向物镜透射，并将从光盘反射的光衍射到光检测器; 以及处理单元，处理信息信号以控制由光源产生的入射光，并处理来自光电检测器的检测光。 因此，光拾取装置可以用于使用通过所述物镜的近中和中间区域的光束而使用厚度的光盘（CD），以及使用经过近距离的光束的薄的数字视盘（DVD） 所述物镜的远轴区域，无论盘的厚度如何，都可以检测信号而不拾取噪声。

公开(公告)号：US07558179B2

公开(公告)日：2009-07-07

申请号：US11295594

申请日：2005-12-07

Applicant: Jang-hoon Yoo ,  Chul-woo Lee ,  Jong-ryull Kim

Inventor： Jang-hoon Yoo ,  Chul-woo Lee ,  Jong-ryull Kim

IPC: G11B7/00

CPC classification number: G11B7/127 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1372 ,  G11B2007/0006

Abstract: An optical pickup compatible with recording media having different formats, the optical pickup includes a light device module having a first light beam source and a second light beam source to emit corresponding first and second light beams having different wavelengths, a hologram light coupler to separately guide the first and second light beams along the same optical path such that the first and second light beams go toward a corresponding one of the recording media, an optical path changing element to selectively alter the optical path of an incident light beam, and an objective lens disposed on an optical path between said optical path changing element the corresponding one of the recording media to focus the first and second light beam on the corresponding one of the recording media, and a photodetector to receive the first and second light beam incident from said optical path changing element.

公开(公告)号：US06198714B1

公开(公告)日：2001-03-06

申请号：US09505155

申请日：2000-02-15

Applicant: Jang-hoon Yoo ,  Chong-sam Chung ,  Chul-woo Lee ,  Kun-ho Cho

Inventor： Jang-hoon Yoo ,  Chong-sam Chung ,  Chul-woo Lee ,  Kun-ho Cho

IPC: G11B700

CPC classification number: G11B7/1353 ,  G11B7/126 ,  G11B7/127 ,  G11B7/131 ,  G11B7/1356 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/139 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

Abstract: An optical pickup compatible with a plurality of optical recording media each using light of a different wavelength. The optical pickup includes at least one light source, an objective lens having a function of focusing light emitted from the light source into the optimal light spot on an information recording surface of one of the plurality of the optical recording media, and a light detector to detect light transmitted through the objective lens after being reflected from the information recording surface of the optical recording medium on which the light spot is formed. The objective lens has an inner area, an annular lens area and an outer area such that the annular lens area divides the inner area from the outer area and has a ring shape centered at a vertex. The inner area, the annular lens area and the outer area have aspherical surface shapes to focus light transmitted through the inner area and the outer area into a single light spot by which information can be read from the information recording surface of a relatively thin first optical recording medium and scatter light transmitted through the annular lens area located between the inner area and the outer area so that information cannot be read from the information recording surface of the first optical recording medium, during reproduction of the first optical recording medium. The inner area and the annular lens area transmit light into a single light spot by which information can be read from the information recording surface of a relatively thick second optical recording medium and scatters light transmitted through the outer lens area so that information cannot be read from the information recording surface of the second optical recording medium, during reproduction of the second optical recording medium.

Abstract translation: 一种与多个使用不同波长的光的多个光学记录介质兼容的光学拾取器。 光拾取器包括至少一个光源，具有将从光源发射的光聚焦到多个光学记录介质之一的信息记录表面上的最佳光点中的功能的物镜，以及光检测器 在从形成有光斑的光记录介质的信息记录面反射后，检测透过物镜的光。 物镜具有内部区域，环形透镜区域和外部区域，使得环形透镜区域将内部区域与外部区域分开并且具有以顶点为中心的环形。 内部区域，环形透镜区域和外部区域具有非球面形状，以将透过内部区域和外部区域的光聚焦成单个光点，通过该单个光点可以从相对薄的第一光学信息记录表面读取信息 记录介质和透射通过位于内部区域和外部区域之间的环形透镜区域的散射光，使得在第一光学记录介质的再现期间不能从第一光学记录介质的信息记录表面读取信息。 内部区域和环形透镜区域将光透射到单个光点中，通过该单个光点可以从相对较厚的第二光学记录介质的信息记录表面读取信息，并散射透过外部透镜区域的光，从而不能从 在第二光学记录介质的再现期间，第二光学记录介质的信息记录表面。

公开(公告)号：US5822135A

公开(公告)日：1998-10-13

申请号：US640474

申请日：1996-05-01

Applicant: Chul-woo Lee ,  Dong-ho Shin ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Kun-ho Cho ,  Pyong-yong Seong ,  Jang-hoon Yoo ,  Yong-hoon Lee

Inventor： Chul-woo Lee ,  Dong-ho Shin ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Kun-ho Cho ,  Pyong-yong Seong ,  Jang-hoon Yoo ,  Yong-hoon Lee

IPC: B29D11/00 ,  G02B3/10 ,  G02B27/58 ,  G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G02B9/00

CPC classification number: G11B7/1353 ,  B29D11/00009 ,  G02B27/58 ,  G02B3/10 ,  G11B7/0909 ,  G11B7/133 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/1381 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727 ,  G11B7/0045 ,  G11B7/005 ,  Y10S425/808

Abstract: A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam, thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.

公开(公告)号：US5737299A

公开(公告)日：1998-04-07

申请号：US733970

申请日：1996-10-18

Applicant: Jang-hoon Yoo ,  Chul-woo Lee

Inventor： Jang-hoon Yoo ,  Chul-woo Lee

IPC: G02B5/30 ,  G02B27/58 ,  G11B7/135 ,  G11B7/00

CPC classification number: G11B7/1367 ,  G02B27/58 ,  G02B5/3083

Abstract: An optical pickup apparatus which can reduce effective size of an optical spot focused on an optical recording medium is provided. The optical pickup apparatus, in which a light beam emitted from a light source is focused on an optical medium for recording a signal on the optical medium and reproducing the signal from the optical medium, includes an objective lens for focusing the light beam on the surface of the optical medium and focusing a beam reflected from the surface of the optical medium, and two or more wave plates each having a different optical axis direction and located on an optical path between the light source and the objective lens. As a result, the spot size and the intensity of a first side lobe can be decreased, and the spot size can be adjusted according to the recording and reproducing modes.

Abstract translation: 提供一种可以减少聚焦在光记录介质上的光点的有效尺寸的光拾取装置。 其中从光源发射的光束聚焦在用于在光学介质上记录信号并从光学介质再现信号的光学介质上的光学拾取装置包括用于将光束聚焦在表面上的物镜 并且聚焦从光学介质的表面反射的光束，以及两个或更多个波片，每个波片具有不同的光轴方向并且位于光源和物镜之间的光路上。 结果，可以减小第一旁瓣的光斑尺寸和强度，并且可以根据记录和再现模式来调整光斑尺寸。

公开(公告)号：US5557597A

公开(公告)日：1996-09-17

申请号：US357240

申请日：1994-12-13

Applicant: Chul-woo Lee ,  Jang-hoon Yoo

Inventor： Chul-woo Lee ,  Jang-hoon Yoo

IPC: G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC classification number: G11B7/131 ,  G11B7/0912 ,  G11B7/1372 ,  G11B7/0943

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 includes two focusing lenses each for focusing the reflected light of the optical disk by splitting the reflected light into two beams with respect to the optical axis and two photo-detectors for receiving the respectively focused beams, which simplifies necessary components for a beam size method. The two focusing lenses whose focal lengths are different from each other does not necessitate use of a beam splitter, thereby contributing to reduction of necessary components and optimizing the arrangement of the components. Also, the operational stability is secured by removing the sensitivity to the tilt and shift of an optical axis.

Abstract translation: 用于检测表示物镜相对于光盘的聚焦误差程度的信号的聚焦误差检测器包括两个聚焦透镜，每个聚焦透镜用于通过将反射光分成两束相对于 光轴和两个用于接收分别聚焦的光束的光电检测器，这简化了用于光束尺寸方法的必要部件。 焦距彼此不同的两个聚焦透镜不需要使用分束器，从而有助于减少必要的部件并优化部件的布置。 此外，通过消除对光轴的倾斜和偏移的灵敏度来确保操作稳定性。