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    • 1. 发明授权
    • Method for designing an optical pickup
    • 光学拾取器的设计方法
    • US07680016B2
    • 2010-03-16
    • US11514902
    • 2006-09-05
    • Ryotaro NakagawaMasanori TakahashiHideaki FunakoshiTeruaki Sogawa
    • Ryotaro NakagawaMasanori TakahashiHideaki FunakoshiTeruaki Sogawa
    • G11B7/00
    • G11B7/082G11B7/1275G11B7/131G11B7/22G11B2007/0006
    • A method for designing an optical pickup is provided. The optical pick includes a monolithic laser diode that emits a laser light beam for DVD recording and a laser light beam for CD playback, two photodetective portions, and an objective lens, for each of the emitting portions of the monolithic laser diode for emitting the DVD recording and CD playback laser light beams respectively, the specification of the error of the emission direction thereof is determined according to the following formula: |(Δθ⊥1×Δθ1×Dpd1/Dob1−Δθ⊥2×Δθ2×Dpd2/Dob2)×Kpd2|≦α, where, “1” corresponds to the DVD recording laser light beam and “2” corresponds to the CD playback laser light beam, Δθ⊥ represents the emission angle; Δθ represents the sensitivity; Dob represents the diameter of the light beam; Dpd represents the diameter of the spot formed by the light beam; Kpd represents the sensitivity; and α represents the tolerable value.
    • 提供了一种用于设计光学拾取器的方法。 光学拾取器包括发射用于DVD记录的激光束和用于CD重放的激光束的两片光电二极管,用于发射DVD的单片激光二极管的每个发射部分的两个光电检测部分和物镜 记录和CD播放激光光束,其发射方向的误差的规格根据下式确定:|(&Dgr;& Thetas;⊥1×&Dgr;&Thetas; 1×Dpd1 / Dob1-&Dgr;&Thetas; ⊥2×&Dgr;&thetas; 2×Dpd2 / Dob2)×Kpd2 |≦̸α,其中,“1”对应于DVD记录激光束,“2”对应于CD播放激光束,&D; ⊥表示发射角; &Dgr;&thetas; 代表灵敏度; Dob表示光束的直径; Dpd表示由光束形成的光斑的直径; Kpd代表灵敏度; α表示可容忍的值。
    • 2. 发明申请
    • Optical Disc Apparatus
    • 光盘装置
    • US20080089192A1
    • 2008-04-17
    • US11871679
    • 2007-10-12
    • Ryotaro NAKAGAWATeruaki SogawaMasanori Takahashi
    • Ryotaro NAKAGAWATeruaki SogawaMasanori Takahashi
    • G11B7/00
    • G11B7/0945G11B7/0053G11B7/0908
    • An optical disc apparatus comprises, an optical pickup, a signal extracting unit for reading address information and an RF signal from an optical disc based on signal read by the optical pickup, and a main controller for performing jitter control and focus control. At an initial reading of the optical disc, the main controller determines whether an address information detector succeeds in reading the address information. If not successful (NO in S3), the main controller offsets a defocus position to two points in plus and minus directions from a defocus position giving best jitter (S7), calculates an approximate curve of signal level characteristics with a peak value (S8), and adjusts and allows the defocus value to correspond to this peak value (S9). If the optical disc apparatus cannot read address information, depending on the defocus value, it increases the signal level of the address information by the defocus position adjustment.
    • 光盘装置包括:光拾取器,用于基于由光学拾取器读取的信号从光盘读取地址信息和RF信号的信号提取单元,以及用于执行抖动控制和聚焦控制的主控制器。 在初始读取光盘时,主控制器确定地址信息检测器是否成功读取地址信息。 如果不成功(S 3中为“否”),则主控制器将散焦位置偏离从提供最佳抖动的散焦位置的正负方向的两个点(S 7),计算具有峰值的信号电平特性的近似曲线( S 8),并且调整并允许散焦值对应于该峰值(S 9)。 如果光盘装置不能读取地址信息,则根据散焦值,通过散焦位置调整来增加地址信息的信号电平。
    • 3. 发明授权
    • Optical pickup
    • 光学拾音
    • US08199623B2
    • 2012-06-12
    • US12256497
    • 2008-10-23
    • Teruaki SogawaMasanori Takahashi
    • Teruaki SogawaMasanori Takahashi
    • G11B7/00
    • G11B7/127G11B7/1263G11B7/13
    • An optical pickup includes a semiconductor laser, a beam splitter, a collimating lens, an objective lens, an aperture and a front monitor. The beam splitter splits a light beam emitted by the semiconductor laser into transmitted light and reflected light. The front monitor detects luminous energy of the transmitted light. The front monitor is disposed near an optical axis of the transmitted light so that the following is satisfied: 1≦(S×L)/(s×f)≦6.8. S is an area of an entrance pupil of the objective lens, f is an optical distance from an emission portion of the semiconductor laser to the collimating lens, s is an effective receiving area of the front monitor, and L is an optical distance from the emission portion of the semiconductor laser to the front monitor.
    • 光拾取器包括半导体激光器,分束器,准直透镜,物镜,孔径和前监视器。 分束器将由半导体激光器发射的光束分离成透射光和反射光。 前置显示器检测透射光的光能。 前面监视器设置在透射光的光轴附近,使得满足以下条件:1≦̸(S×L)/(s×f)≦̸ 6.8。 S是物镜的入射光瞳的面积,f是从半导体激光器的发射部分到准直透镜的光学距离,s是前监视器的有效接收面积,L是距离 半导体激光器的发射部分到前监视器。
    • 4. 发明授权
    • Optical disc apparatus
    • 光盘装置
    • US07778130B2
    • 2010-08-17
    • US11871679
    • 2007-10-12
    • Ryotaro NakagawaTeruaki SogawaMasanori Takahashi
    • Ryotaro NakagawaTeruaki SogawaMasanori Takahashi
    • G11B7/00
    • G11B7/0945G11B7/0053G11B7/0908
    • An optical disc apparatus comprises, an optical pickup, a signal extracting unit for reading address information and an RF signal from an optical disc based on signal read by the optical pickup, and a main controller for performing jitter control and focus control. At an initial reading of the optical disc, the main controller determines whether an address information detector succeeds in reading the address information. If not successful (NO in S3), the main controller offsets a defocus position to two points in plus and minus directions from a defocus position giving best jitter (S7), calculates an approximate curve of signal level characteristics with a peak value (S8), and adjusts and allows the defocus value to correspond to this peak value (S9). If the optical disc apparatus cannot read address information, depending on the defocus value, it increases the signal level of the address information by the defocus position adjustment.
    • 光盘装置包括:光拾取器,用于基于由光学拾取器读取的信号从光盘读取地址信息和RF信号的信号提取单元,以及用于执行抖动控制和聚焦控制的主控制器。 在初始读取光盘时,主控制器确定地址信息检测器是否成功读取地址信息。 如果不成功(S3中为“否”),则主控制器将散焦位置偏离从给出最佳抖动的散焦位置(S7)的正负方向的两个点,以峰值计算信号电平特性的近似曲线(S8) ,并且调整并允许散焦值对应于该峰值(S9)。 如果光盘装置不能读取地址信息,则根据散焦值,通过散焦位置调整来增加地址信息的信号电平。
    • 6. 发明申请
    • Method for designing an optical pickup
    • 光学拾取器的设计方法
    • US20070002717A1
    • 2007-01-04
    • US11514902
    • 2006-09-05
    • Ryotaro NakagawaMasanori TakahashiHideaki FunakoshiTeruaki Sogawa
    • Ryotaro NakagawaMasanori TakahashiHideaki FunakoshiTeruaki Sogawa
    • G11B7/00
    • G11B7/082G11B7/1275G11B7/131G11B7/22G11B2007/0006
    • According to a method for designing an optical pickup including a monolithic laser diode that emits a laser light beam for DVD recording and a laser light beam for CD playback, two photodetective portions provided on the same substrate for receiving the laser light beams, and an objective lens, for each of the emitting portions of the monolithic laser diode for emitting the DVD recording and CD playback laser light beams respectively, the specification of the error of the emission direction thereof is determined according to the following formula: |(Δθ ⊥1×Δθ1×Dpd1/Dob1−Δθ ⊥2×Δθ2×Dpd2/Dob2)×Kpd2|≦7, where, let the variables corresponding to the DVD recording laser light beam be followed by a subscript “1” and variables corresponding to the CD playback laser light beam be followed by a subscript “2”, Δθ ⊥ represents the emission angle; Δθ represents the sensitivity, to the emission angle, of the deviation of the gravity center of the intensity of the light exiting from the object lens; Dob represents the diameter of the light beam immediately after exiting from the object lens; Dpd represents the diameter of the spot formed by the light beam on the photodetective portion; Kpd represents the sensitivity of the deviation of light reception balance to the deviation of the photodetective portion; and a represents the tolerable value for the remnant deviation of light reception balance.
    • 根据用于设计包括发射用于DVD记录的激光束的单片激光二极管和用于CD重放的激光束的光学拾取器的方法,设置在用于接收激光束的同一基板上的两个光电检测部分和目标 透镜,对于分别用于发射DVD记录和CD播放激光的单片激光二极管的每个发射部分,其发射方向的误差的规格根据以下公式确定:|(Deltatheta⊥ 1 xDeltatheta xDpd 1 / Dob 1→ - →2→2→2→2→2→ 其中,使与DVD记录激光相对应的变量为x / p2 2 后跟一个下标“1”,对应于CD播放激光光束的变量后跟一个下标“2”,Deltatheta⊥表示发射角; Deltatheta代表离开物镜的光强度的重心偏离对发射角的敏感度; Dob表示从物镜离开后立即直径的光束; Dpd表示由光电检测部分上的光束形成的光斑的直径; Kpd表示光接收平衡与光检测部的偏差的偏差的灵敏度; a表示光接收余量的残余偏差的容许值。