公开(公告)号：JP2006065983A

公开(公告)日：2006-03-09

申请号：JP2004248927

申请日：2004-08-27

Applicant: Sony Corp ,  ソニー株式会社

Inventor： YAMAMOTO KENJI ,  NISHI NORIAKI ,  KANETANI MIDORI ,  SATO KATSUTOSHI

IPC: G11B7/135 ,  G11B7/09

Abstract: PROBLEM TO BE SOLVED: To provide a method of controlling a divided light quantity ratio by which an optimal divided light quantity ratio can be obtained for coping with light of multiwavelength of two or more wavelengths, and to provide an optical pickup system and an optical recording and reproducing apparatus using the method. SOLUTION: Corresponding to the light of a plurality of wavelengths incident on a diffraction optical element, the divided light quantity ratio of 0-th diffracted light and that of primary diffracted light are controlled to respective predetermined values. As the diffraction optical element, a diffraction optical element by liquid crystal or a junction hologram element, etc. is used. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种控制分光量比的方法，通过该分配光量比可以获得用于应对两个或更多个波长的多波长的光的最佳分光量，并提供光拾取系统和 使用该方法的光学记录和再现装置。 解决方案：对应于入射在衍射光学元件上的多个波长的光，将第0衍射光和主衍射光的分光量比控制为相应的预定值。 作为衍射光学元件，使用通过液晶的衍射光学元件或结全息元件等。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2006031902A

公开(公告)日：2006-02-02

申请号：JP2004213595

申请日：2004-07-21

Applicant: Sony Corp ,  ソニー株式会社

Inventor： YAMAMOTO KENJI

IPC: G11B7/135

CPC classification number: G11B7/1275 ,  G11B7/1353 ,  G11B7/13922 ,  G11B2007/0006

Abstract: PROBLEM TO BE SOLVED: To realize interchangeability of a BD or a HD DVD and a DVD and a CD by one objective lens in a condensing optical system concurrently having an objective lens using a diffraction grating. SOLUTION: In the condensing optical system 1, a light for recording and/or reproducing a plurality of optical recording media of different kinds is converged on this optical recording medium, by using a diffraction element 2 and a lens 3, wherein the diffraction element 2 has at least first and second diffraction planes 11 and 12; the first diffraction plane 11 diffracts a light of wavelength 630-670 nm and aberration compensation is performed for an optical recording medium in which the thickness of a cover part 100A is approximately 0.6 mm; the second diffraction plane 12 diffracts light of wavelength 400-415 nm; and aberration compensation is performed for the optical recording medium 10A, in which the thickness of a cover part is approximately 0.1 mm or approximately 0.6 mm. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 解决的问题：通过同时具有使用衍射光栅的物镜的聚光光学系统中的一个物镜实现BD或HD DVD以及DVD和CD的可互换性。 解决方案：在聚光光学系统1中，通过使用衍射元件2和透镜3，将用于记录和/或再现不同种类的多个光学记录介质的光会聚在该光学记录介质上，其中 衍射元件2至少具有第一和第二衍射平面11和12; 第一衍射平面11衍射波长630-670nm的光，并且对于其中盖部分100A的厚度大约为0.6mm的光记录介质进行像差补偿; 第二衍射平面12衍射波长400-415nm的光; 并且对于其中盖部分的厚度为大约0.1mm或大约0.6mm的光记录介质10A，执行像差补偿。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2006031901A

公开(公告)日：2006-02-02

申请号：JP2004213590

申请日：2004-07-21

Applicant: Sony Corp ,  ソニー株式会社

Inventor： YAMAMOTO KENJI ,  MAEDA FUMISADA ,  IMAI SATOSHI ,  SEO KATSUHIRO ,  KATO YOSHIAKI ,  OKAMOTO YOSHIKI ,  TAMURA TATSUMOTO

IPC: G11B7/135 ,  G02B13/00

Abstract: PROBLEM TO BE SOLVED: To provide an objective lens for which components of third order and fifth order of spherical aberrations, caused by a thickness error of cover layers or difference of thickness are compensated simultaneously and aberration compensation can be performed properly, even in an optical system in which high order aberration is caused, and to provide an optical pickup apparatus using this, an optical recording and reproducing apparatus, and an aberration-compensating method. SOLUTION: An objective lens 3 for converging light on a recording plane of an optical recording medium and performing recording and/or reproducing is constituted so that when spherical aberration of third order and fifth order, caused by a thickness error of cover layers or difference of thickness of the optical recording medium 10, are denoted respectively as SA3(C), SA5(C), and spherical aberration of third order and fifth order, caused by a magnification aberration of the objective lens, are denoted respectively as SA3(L), SA5(L), 0.1 COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：为了提供一种物镜，其由覆盖层的厚度误差或厚度差引起的三阶和五阶球面的分量被同时补偿并且可以适当地执行像差补偿，甚至 在其中引起高阶像差的光学系统中，并且提供使用它的光学拾取装置，光学记录和再现装置以及像差补偿方法。 解决方案：用于将光聚焦在光学记录介质的记录平面上并执行记录和/或再现的物镜3被构造成使得当覆盖层的厚度误差引起的三阶和五阶的球面像差 或光学记录介质10的厚度差分别表示为SA3（C），SA5（C），由物镜的倍率像差引起的三阶和五阶球面像差分别表示为SA3 （L），SA5（L），0.1（SA58L）/ SA3（L）/ SA5（C）/ SA＃（C）<1.9。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2005327338A

公开(公告)日：2005-11-24

申请号：JP2004142465

申请日：2004-05-12

Applicant: Sony Corp ,  ソニー株式会社

Inventor： YUGAWA HIROAKI ,  SATO KATSUTOSHI ,  YAMAMOTO KENJI ,  NISHI NORIAKI ,  KANETANI MIDORI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide an optical pickup which can separate a plurality of optical beams and stably guide the optical beams to corresponding objective lenses. SOLUTION: The optical pickup comprises a light source section 10 emitting the optical beams of different wavelengths, a diffraction grating 11 for branching the optical beams to main beams and sub-beams, a collimating lens 12 for converting the exit light to parallel pencils, a first beam splitter 13 for branching the exit light and return light, a photodetector 14 for adjusting the exit optical beam, an expander 15 for expanding the exit optical beam diameter, and a collimating lens l6 for converting the optical beam transmitted through the expander 15 again to the parallel pencils. The optical pickup is provided with a first objective lens 19 having a first numerical aperture for condensing the first optical beam 51 onto a BD recording surface, and a second objective lens 20 having a second numerical aperture for condensing the second optical beam 52 and the third optical beam 53 onto the recording surface of a DVD or CD, and is provided with a luminous flux separating and starting-up section 17 in common use as a luminous flux separating means for separating an optical path so as to make the optical beams of the different wavelengths incident on the respective objective lenses and a means for guiding the separated optical beams to the corresponding objective lenses. COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种能够分离多个光束并将光束稳定地引导到相应物镜的光学拾取器。 光拾取器包括发射不同波长的光束的光源部分10，用于将光束分支到主光束和子光束的衍射光栅11，用于将出射光转换成平行的准直透镜12 铅笔，用于分支出射光和返回光的第一分束器13，用于调节出射光束的光电检测器14，用于扩展出射光束直径的扩展器15以及用于转换透过光束的光束的准直透镜16 扩展器15再次到平行铅笔。 光学拾取器设置有具有用于将第一光束51聚光到BD记录表面上的第一数值孔径的第一物镜19和具有用于冷凝第二光束52和第三光束52的第二数值孔径的第二物镜20 光束53到DVD或CD的记录表面上，并且设置有通常通过光束分离和启动部17作为用于分离光路的光束分离装置，以使得光束 入射到各个物镜上的不同波长和用于将分离的光束引导到相应的物镜的装置。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2005285294A

公开(公告)日：2005-10-13

申请号：JP2004102044

申请日：2004-03-31

Applicant: Sony Corp ,  ソニー株式会社

Inventor： TANAKA KAYOKO ,  YAMAMOTO KENJI

IPC: G02B5/10 ,  G02B7/198 ,  G11B7/125 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide a reflection type spherical aberration correction element which is easily downsized and easy in assembling and position adjustment as a means for correcting a spherical aberration caused in movement between layers in an optical pickup for performing the recording and reproducing of a multi-layer disk.
SOLUTION: The reflection type spherical aberration correction element 40 having a reflection plane deformed in an uneven shape is arranged on an optical path as the means for correcting the spherical aberration. The reflection type spherical aberration correction element 40 includes a buckling type micro-actuator in which vibration plates (diaphragm) having such structure that a piezo thin film 44 is held between electrode films 43 and 45 are laminated on a semiconductor substrate 41, curvature of the reflection plane by the vibration plate is changed by controlling applied voltage to each electrode film 43, 45.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种反射型球面像差校正元件，其容易地小型化，并且易于组装和位置调整，作为用于校正在用于执行记录的光学拾取器中的层之间的运动引起的球面像差的装置，以及 再现多层盘。 解决方案：具有变形为不平坦形状的反射面的反射型球面像差校正元件40被布置在光路上，作为用于校正球面像差的装置。 反射型球面像差校正元件40包括屈曲型微致动器，其中在半导体衬底41上层压具有在电极膜43和45之间保持有压电薄膜44的结构的振动板（隔膜），曲率 通过控制对每个电极膜43,45的施加电压来改变振动板的反射平面。（C）2006，JPO和NCIPI

公开(公告)号：JP2005243237A

公开(公告)日：2005-09-08

申请号：JP2005149786

申请日：2005-05-23

Applicant: Sony Corp ,  ソニー株式会社

Inventor： MAEDA FUMISADA ,  SUZUKI AKIRA ,  KATO YOSHIAKI ,  KAI SHINICHI ,  YAMAMOTO KENJI

IPC: G11B7/22

Abstract: PROBLEM TO BE SOLVED: To precisely perform the positioning of a 2nd lens to a 1st lens of two lenses of a group even if contours of the 1st and 2nd lenses have errors. SOLUTION: The tilt detecting device is provided with two lenses of a group composed of the 1st lens 22 and the 2nd lens with a counter face 27 faced to an optical recording medium, a reference plane on which the two lenses of a group 21 are mounted, and a condenser lens 5 for irradiating the counter face 27 of the 2nd lens 23 with laser light emitted from a laser light source 2 in a focused state, and radiates the focused laser light toward the counter face 27 of the 2nd lens 23, and detects, in the neighborhood of the focal point of the light reflected by this counter face 27, a tilt of the above 2nd lens to the 1st lens by detecting a position on a plane perpendicular to the optical axis of the reflected light. COPYRIGHT: (C)2005,JPO&NCIPI

Abstract translation: 要解决的问题：即使第一和第二透镜的轮廓有误差，即使将第二透镜精确地执行到组的两个透镜的第一透镜的定位。

解决方案：倾斜检测装置设置有由第一透镜22和第二透镜组成的组的两个透镜，其中面对着光学记录介质的对置面27，组的两个透镜的参考平面 21，以及聚光透镜5，用于以聚焦状态从激光光源2发射的激光照射第二透镜23的对置面27，并将聚焦的激光照射到第二透镜的对置面27 并且通过检测与反射光的光轴垂直的平面上的位置，在该对置面27反射的光的焦点附近，检测上述第2透镜与第1透镜的倾斜。 版权所有（C）2005，JPO＆NCIPI

公开(公告)号：JP2003173531A

公开(公告)日：2003-06-20

申请号：JP2001370497

申请日：2001-12-04

Applicant: SONY CORP

Inventor： NISHI NORIAKI ,  YAMAMOTO KENJI

IPC: G11B7/24 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/007 ,  G11B7/125 ,  G11B7/1263 ,  G11B7/135 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1365 ,  G11B7/1369 ,  G11B7/1372 ,  G11B7/1395

Abstract: PROBLEM TO BE SOLVED: To obtain good properties during recording and reproduction or for different kinds of optical recording media and each recording surface of a multilayer optical recording medium by using a light source with a sufficient manufacturing characteristics or a light source with smallish light output rating which can reduce the output power ratio of the light source. SOLUTION: The intensity of luminous flux emitted from an optical head 104 onto the optical recording medium 102 is controlled with optical coupling efficiency variable elements 214 and 215 in accordance with the kind of the optical recording medium 102, the recording surface in the multilayer optical recording medium and an operation mode. This changes greatly the intensity of the luminous flux emitted onto the optical recording medium 102 without extremely augmenting the output power ratio of the light source 212. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003157566A

公开(公告)日：2003-05-30

申请号：JP2001353382

申请日：2001-11-19

Applicant: SONY CORP

Inventor： NISHI NORIAKI ,  MIZUMA HIROAKI ,  KIMURA MOTOI ,  YAMAMOTO KENJI ,  NISHINO MASATOSHI

IPC: G02F1/13 ,  G02B27/28 ,  G11B7/125 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide satisfactory recording and reproducing characteristics by using the light source of high productivity or light source of comparatively small light output rating by sufficiently reducing laser noise in the case of reproduction even when the output power ratio of the light source in recording and reproducing is reduced. SOLUTION: In an optical head 104, the intensity of light emitted from a light source 2 is appropriately and variably controlled when passing an element 3 for varying optical coupling efficiency and especially in a reproducing mode, the light is made incident on an optical disk 102 with light intensity smaller relatively to the light intensity of the light source 2. Therefore, by controlling optical coupling efficiency in the element 3 for varying optical coupling efficiency while switching it in recording and reproducing, even without extremely enlarging the output power ratio of recording and reproducing on the side of the light source 3, the level of light with which an optical recording medium is irradiated can be remarkably changed between recording and reproducing.

公开(公告)号：JP2002269797A

公开(公告)日：2002-09-20

申请号：JP2001062957

申请日：2001-03-07

Applicant: SONY CORP

Inventor： YAMAMOTO KENJI ,  OSATO KIYOSHI

IPC: G02B5/30 ,  G02F1/13 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To obtain the stable polarization state independently of a fluctuation of refractive index of liquid crystal molecule due to the temperature change, when a liquid crystal element is used as a wavelength plate. SOLUTION: When the liquid crystal element is used as a 1/2 wavelength plate 104, two liquid crystal elements 104A, 104B are arranged so that the alignment directions of each liquid crystal molecule are orthogonally crossed. Then, the difference (A-B) between the phase difference A given by one liquid crystal element 104A to the polarization parallel to the alignment with respect to the polarization orthogonally crossed to the alignment and the phase difference B given by another liquid crystal element 104B to the polarization parallel to the alignment with respect to the polarization orthogonally crossed to the alignment, is expressed as l/2+nλ. Even when the temperature change is generated, the phase differences for the liquid crystal elements 104A, 104B given respectively to the polarization parallel to the alignment respect to the polarization orthogonally crossed to the alignment are varied but these varied amounts are almost the same. Consequently, the phase difference given by two alignments is λ/2+nλ and unchanged.

公开(公告)号：JP2002251774A

公开(公告)日：2002-09-06

申请号：JP2001046432

申请日：2001-02-22

Applicant: SONY CORP

Inventor： YAMAMOTO KENJI ,  OSATO KIYOSHI

IPC: G02B5/30 ,  G02F1/13 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To appropriately correct wave front aberration caused in an optical system by a liquid crystal element without being affected by a quarter wave plate disposed on an optical path from a light source via a recording medium to a light detector. SOLUTION: A liquid crystal element A4 is disposed at an advancing light path (a first light path) from the laser light source 1 to an optical disk 8 so as to align a liquid crystal in a polarization direction of light made incident into the optical disk 8 to correct the aberration of advancing light. Separately from the liquid crystal element A4, a liquid crystal element B10 is additionally disposed at returning light path (a second light path) from the quarter plate 5 to the light detector 13 so as to align the liquid crystal in the polarization direction of returning light to correct the aberration of the returning light. Thus, since the polarization states of advancing light and returning light are different from each other by 90 degrees, respective aberrations are independently corrected.