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1. 发明专利

DE102005057512A1 未知
公开(公告)号：DE102005057512A1
公开(公告)日：2006-06-08
申请号：DE102005057512
申请日：2005-12-01
申请人： PENTAX CORP
发明人： MARUYAMA KOICHI , TASHIRO YOSHIYUKI , KOREEDA DAISUKE
IPC分类号： G02B13/00 , G11B7/135
摘要： A method of designing an optical element to be used for an optical system in which each of a plurality of light beams having different design wavelengths passes through the optical element is provided. The method includes determining at least two types of optical path difference functions including first and second optical path difference functions in such a manner that proportion, brought by the first optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized is different from proportion, brought by the second optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized, and obtaining a shape defined by combining the at least two types of optical path difference functions so as to apply the obtained shape to at least one surface of surfaces of the optical element.

2. 发明专利

DE4240747B4 未知
公开(公告)号：DE4240747B4
公开(公告)日：2005-12-22
申请号：DE4240747
申请日：1992-12-03
申请人： PENTAX CORP
发明人： KUBOYA HIROSHI , TAKAHASHI TOSHIHARU , IKI MAKOTO , SHIRAYANAGI MORIYASU , MARUYAMA KOICHI , HIYAMUTA TERUAKI , SENSUI TAKAYUKI
IPC分类号： G02B5/02 , G03B13/24 , G03F7/00 , G03F7/20

3. 发明专利

DE10084813B4 未知
公开(公告)号：DE10084813B4
公开(公告)日：2004-04-15
申请号：DE10084813
申请日：2000-03-01
申请人： PENTAX CORP
发明人： MARUYAMA KOICHI
IPC分类号： G02B13/00 , G02B5/18 , G02B13/18 , G11B7/00 , G11B7/125 , G11B7/1353 , G11B7/1374 , G11B7/139 , G11B7/135
摘要： An optical system of an optical pick-up that is capable of using optical discs DVD and CD. The system includes a light source portion for selectively emitting a first laser beam (650 nm) and a second laser beam (780 nm), and an objective lens for converging the laser beam from the light source portion onto an recording layer of the optical disc. The objective lens is provided with a transmittance controlling phase grating in a peripheral region to have a wavelength dependence such that the transmittance for the first laser beam is higher than the transmittance for the second laser beam. The transmittance controlling phase grating is formed as a plurality of concentric grooves. Each of the grooves has a rectangular cross-section in a plane containing an optical axis of the objective lens.

4. 发明专利

JP2006185576A DESIGN METHOD OF OPTICAL ELEMENT AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE 审中-公开
公开(公告)号：JP2006185576A
公开(公告)日：2006-07-13
申请号：JP2005343555
申请日：2005-11-29
申请人： PENTAX CORP
发明人： MARUYAMA KOICHI , TASHIRO YOSHIYUKI
IPC分类号： G11B7/135 , G02B5/18 , G02B13/18
摘要： PROBLEM TO BE SOLVED: To provide a design method of an optical element equipped with a single diffraction structure having diffractive performance to effectively utilizing each light beam even when any one among a plurality of kinds of light beams having different design wavelengths is used, and also to provide an optical information recording/reproducing device wherein the optical element designed by the above design method is mounted. SOLUTION: This design method of an optical element is used for a plurality of kinds of luminous fluxes having different design wavelengths, and at least such a 1st optical path difference function and a 2nd optical path difference function are calculated that a proportion of diffraction orders is different, at which diffraction efficiencies are maximized with respect to each luminous flux incident to the optical element, and by adding the calculated all optical path difference functions, the diffraction structure having a diffractive performance affecting the plurality of kinds of luminous fluxes is formed on at least one surface of the optical element. COPYRIGHT: (C)2006,JPO&NCIPI

5. 发明专利

JP2005209250A Optical pickup device and objective lens for optical pickup 有权
标题翻译：光学拾取器件和用于光学拾取的目标镜头
公开(公告)号：JP2005209250A
公开(公告)日：2005-08-04
申请号：JP2004012236
申请日：2004-01-20
申请人： Pentax Corp , ペンタックス株式会社
发明人： KOREEDA DAISUKE , MARUYAMA KOICHI
IPC分类号： G02B13/00 , G02B13/18 , G11B7/00 , G11B7/125 , G11B7/135
CPC分类号： G11B7/1353 , G11B7/1275 , G11B7/1374 , G11B2007/0006
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup device capable of forming a good spot by suppressing spherical aberration and off-axis aberration even in recording/reproduction of information on an existing optical disk or a new standard optical disk. SOLUTION: The optical pickup device records or reproduces information on a plurality of optical disks by separately using three kinds of luminous fluxes. An objective lens is arranged so that converged light is made incident on the objective lens for the luminous flux of a first wavelength and divergent light is made incident thereon for the luminous fluxes of second and third wavelengths. The relations of m1>0 and m3 COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种即使在现有光盘或新标准光盘上的信息的记录/再现中也能够抑制球面像差和离轴像差而能够形成良好光斑的光学拾取装置。解决方案：光拾取装置通过分开使用三种光通量在多个光盘上记录或再现信息。物镜设置为使得会聚的光入射到物镜上用于第一波长的光束，并且发散光被入射到其上用于第二和第三波长的光通量。设置m1> 0和m3

6. 发明专利

JP2004247034A Optical pickup system 审中-公开
公开(公告)号：JP2004247034A
公开(公告)日：2004-09-02
申请号：JP2004012235
申请日：2004-01-20
申请人： Pentax Corp , ペンタックス株式会社
发明人： TAKEUCHI SHUICHI , MARUYAMA KOICHI , KOREEDA DAISUKE
IPC分类号： G11B7/135
摘要： PROBLEM TO BE SOLVED: To provide an optical pickup system having compatibility to a plurality of optical disks different in standard of protective layer thickness, and a large operation distance and good aberration characteristics even when a disk protective layer thickness is applied to a relatively thick disk. SOLUTION: In an optical disk objective lens, at least when information is recorded or reproduced to/from a first optical disk, a luminous flux emitted from one of a plurality of light sources and made incident through a coupling lens on the objective lens is a dispersed light having spherical aberration. The spherical aberration of the entire system is corrected by the spherical aberration of the dispersed light and spherical aberrations generated on the objective lens and the disk protective layer, and the coma aberration of the entire system when the objective lens is shifted is corrected by a coma aberration component caused by the spherical aberration of the coupling lens and coma aberration components generated on the object lens and the disk protective layer. COPYRIGHT: (C)2004,JPO&NCIPI

7. 发明专利

JP2004219474A Objective for optical disk 有权
公开(公告)号：JP2004219474A
公开(公告)日：2004-08-05
申请号：JP2003003535
申请日：2003-01-09
申请人： Pentax Corp , ペンタックス株式会社
发明人： TAKEUCHI SHUICHI , MARUYAMA KOICHI
IPC分类号： G02B13/00 , G02B13/18 , G11B7/00 , G11B7/135
CPC分类号： G11B7/139 , G11B7/1353 , G11B7/1374 , G11B2007/0006
摘要： PROBLEM TO BE SOLVED: To provide an objective for an optical disk guaranteeing accurate optical pickup operation while realizing the recording/reproducing of information on/from several kinds of optical disks whose recording surfaces are different.
SOLUTION: The objective for the optical disk has annular structure that at least one surface has a plurality of minute level differences and has interchangeability for at least two kinds of optical disks whose recording density is different. The objective is constituted so that the difference of optical path length made by at least one annular level difference in an outside area is made smaller than the integral multiple of the wavelength of a 2nd laser beam by a specified amount when the surface having the annular level difference is divided to an inside area nearer to an optical axis side and the outside area on the outside of the inside area.
COPYRIGHT: (C)2004,JPO&NCIPI

8. 发明专利

JP2003121734A COMA ABERRATION COMPENSATING ELEMENT AND OPTICAL SYSTEM FOR OPTICAL HEAD USING THE SAME 审中-公开
公开(公告)号：JP2003121734A
公开(公告)日：2003-04-23
申请号：JP2001315557
申请日：2001-10-12
申请人： HITACHI LTD , PENTAX CORP
发明人： TAKEUCHI SHUICHI , MARUYAMA KOICHI , SHIMANO TAKESHI
IPC分类号： G02B13/00 , G02B13/18 , G02B27/00 , G11B7/09 , G11B7/095 , G11B7/135
摘要： PROBLEM TO BE SOLVED: To easily compensate coma aberration caused in the manufacture of an objective and coma aberration caused by the inclination of an optical disk. SOLUTION: A laser beam emitted from a semiconductor laser 1 is made parallel beams by a collimating lens 2, passes through a beam splitter 3, a coma aberration compensating element 30 and the objective 20, and is converged on a recording surface 12 through the transparent protective layer 11 of the optical disk 10. The element 30 is mounted on an objective lens actuator 6 so that it may be integrally driven with the objective 20. The element 30 is an element being a single plate whose both surfaces cause spherical aberration having reverse signs and its paraxial power is almost zero, and it does not cause aberration to luminous flux made incident perpendicularly but causes the coma aberration to the luminous flux made incident obliquely. When eccentricity is found in the objective 20, the element 30 is inclined to cancel the coma aberration.

9. 发明专利

JP2003006909A Objective lens optical system, optical head and optical information reproducing device 有权
标题翻译：目标镜头光学系统，光学头和光学信息再现设备
公开(公告)号：JP2003006909A
公开(公告)日：2003-01-10
申请号：JP2001185559
申请日：2001-06-19
申请人： Hitachi Ltd , Pentax Corp , ペンタックス株式会社 , 株式会社日立製作所
发明人： SHIMANO TAKESHI , ARIYOSHI TETSUO , SHIGEMATSU KAZUO , MARUYAMA KOICHI , TAKEUCHI SHUICHI
IPC分类号： G02B5/30 , G02B13/00 , G02B13/18 , G02F1/13 , G11B7/09 , G11B7/125 , G11B7/135
CPC分类号： G11B7/1378 , G11B7/093 , G11B7/0935 , G11B7/0943 , G11B7/13927
摘要： PROBLEM TO BE SOLVED: To reduce astigmatism generating by the shifting of the axis of coma aberration from the one to compensate to the one to be compensated with a tracking operation, in the compensation of coma aberration of an aberration compensating optical system, for the purpose of realizing one objective lens that shows a wide working distance, easy adjustment and a high NA.
SOLUTION: An objective lens 212 and the coma aberration compensating element 211 are integrated, fixed in a lens-barrel 230 and driven by a two-dimensional lens actuator 255. As a result, no eccentricity is caused between the objective lens 212 and the coma aberration compensating element 211, with no astigmatism generated.
COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：为了减少由偏振轴的偏移产生的散光，以补偿通过跟踪操作补偿的像差，在像差补偿光学系统的彗差的补偿中，为了目的实现显示宽工作距离，易调整和高NA的一个物镜。解决方案：物镜212和彗形像差补偿元件211被一体化，固定在透镜镜筒230中并由二维透镜致动器255驱动。结果，在物镜212和彗差之间不产生偏心像差补偿元件211，不产生像散。

10. 发明专利

JP2007317295A Optical element for optical information recording and reproducing device, optical information recording and reproducing device, and design method of optical element for optical information recording and reproducing device 审中-公开
标题翻译：用于光信息记录和再现设备的光学元件，光学信息记录和再现装置以及用于光信息记录和再现装置的光学元件的设计方法
公开(公告)号：JP2007317295A
公开(公告)日：2007-12-06
申请号：JP2006145220
申请日：2006-05-25
申请人： Pentax Corp , ペンタックス株式会社
发明人： TASHIRO YOSHIYUKI , KOREEDA DAISUKE , MARUYAMA KOICHI
IPC分类号： G11B7/135 , G02B5/18 , G02B13/00 , G02B13/18 , G11B7/125 , G11B7/22
CPC分类号： G11B7/1374 , G11B7/1275 , G11B7/1353 , G11B7/13922 , G11B2007/0006
摘要： PROBLEM TO BE SOLVED: To provide an optical element for an optical information recording and reproducing device, which is an objective lens having compatibility with a plurality of optical disks having specifications different from one another and has high performance though it is easily manufactured. SOLUTION: The optical element for the optical information recording and reproducing device performing recording and the like of information to the respective optical disks by properly using three kinds of nearly parallel luminous fluxes sequentially from a short wavelength side to the three kinds of optical disks sequentially from a high recording density side has a step difference structure having a plurality of concentric refraction surfaces and level differences formed between adjacent refraction surfaces. The structure has a region contributing to convergence of the prescribed luminous flux for obtaining a numerical aperture needed for recording and reproducing the prescribed optical disk and the region has two level differences imparting optical path change amounts different from each other and at least one special level difference having an annular width between adjacent level differences of nearly zero by controlling at least one level difference when the annular width is shorter than the length ten times as long as a first wavelength. COPYRIGHT: (C)2008,JPO&INPIT
摘要翻译：要解决的问题：提供一种用于光信息记录和再现装置的光学元件，其是具有与具有彼此不同的规格的多个光盘的兼容性的物镜，并且具有高性能，尽管它容易制造。解决方案：用于光学信息记录和再现装置的光学元件通过从短波长一侧顺序地适当地使用三种近似平行的光束到三种光学器件，向各个光盘执行信息的记录等从高记录密度侧顺序地形成的盘具有在相邻折射面之间形成的多个同心折射面和电平差的阶梯差分结构。该结构具有有助于规定的光束的会聚的区域，用于获得用于记录和再现规定的光盘所需的数值孔径，并且该区域具有赋予彼此不同的光路改变量的两个水平差异和至少一个特殊水平差当环形宽度短于第一波长的十倍长度时，通过控制至少一个电平差，具有接近于零的相邻电平差之间的环形宽度。版权所有（C）2008，JPO＆INPIT

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