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    • 12. 发明授权
    • Optical scanning with aberration correction
    • 具有像差校正的光学扫描
    • US06496452B2
    • 2002-12-17
    • US09741920
    • 2000-12-20
    • Sjoerd StallingaJoris Jan VrehenJeroen Wals
    • Sjoerd StallingaJoris Jan VrehenJeroen Wals
    • G11B700
    • G11B7/1369G11B7/0956G11B7/13927
    • An optical head scans the information layer (3) of an optical record carrier (1) by means of a radiation beam (13). Optical aberrations in the beam such as coma and spherical aberration, caused by tilt and thickness variations in the optical disc respectively, are compensated by an aberration compensator (27) arranged in the radiation beam. The tilt or thickness variation is measured by a detector (30) and used to control the aberration compensator. The radiation beam is focused onto the information layer by an objective system (11). A displacement of the objective system in the transverse direction (26) as used for radial tracking of the optical beam, causes a mismatch between the wavefront to be compensated and the wavefront introduced by the aberration compensator (27). The detrimental effects of the mismatch are reduced by compensating only part of the aberration. The degree of compensation depends on the maximum displacement of the objective system and the tolerable wavefront error.
    • 光头通过辐射束(13)扫描光学记录载体(1)的信息层(3)。 由光盘中的倾斜和厚度变化引起的诸如彗差和球面像差的光束中的光学像差由布置在辐射束中的像差补偿器(27)补偿。 倾斜或厚度变化由检测器(30)测量并用于控制像差补偿器。 辐射束通过客观系统(11)聚焦到信息层上。 用于光束的径向跟踪的​​横向(26)的物镜系统的位移导致要补偿的波前与由像差补偿器(27)引入的波阵面之间的失配。 通过仅补偿部分像差来减少不匹配的有害影响。 补偿程度取决于物镜系统的最大位移和允许的波前误差。
    • 13. 发明申请
    • Optical Compensator, Optical Element, Optical Scanning Head An Optical Scanning Device
    • 光学补偿器,光学元件,光学扫描头光学扫描装置
    • US20080239926A1
    • 2008-10-02
    • US12088091
    • 2006-09-15
    • Teunis Willem TukkerJoris Jan Vrehen
    • Teunis Willem TukkerJoris Jan Vrehen
    • G11B7/135
    • G11B7/13922G11B7/1353G11B2007/0006G11B2007/0013
    • An optical compensator for use in an optical scanning device for scanning a first optical record carrier (3′) having an information layer (2′) at a first information layer depth d and a second optical record carrier (3″) having an information layer (2″) at a second, different information layer depth d2. The scanning of the first and second optical record carrier is effected using a scanning spot (16) formed on the information layer by a first radiation beam having a first wavelength and a second radiation beam having a second, different wavelength respectively. The optical compensator includes a substantially circular phase structure having an annular zone arranged in the path of the first radiation beam and the second radiation beam. The annular zone is adapted for imparting a wavefront modification to said first radiation beam causing destructive interference over the area of the scanning spot (16) for radiation incident on said annular zone; and a wavefront modification to said second radiation beam for compensating spherical aberration. A further aspect of the present invention relates to an optical element for defining the numerical aperture of a radiation beam. The optical compensator or optical element can be used for a two- or three-wavelength system. The invention also discloses an optical scanning head, and an optical scanning device using the optical compensator. The invention also relates to an optical scanning head and an optical scanning device.
    • 一种用于光学扫描装置的光学补偿器,用于扫描具有第一信息层深度d的信息层(2')的第一光学记录载体(3')和具有信息层的第二光学记录载体(3“) 层(2“)处于不同的信息层深度d 2。 第一和第二光学记录载体的扫描是利用形成在信息层上的扫描点(16)通过具有第一波长的第一辐射束和分别具有第二不同波长的第二辐射束来实现的。 光学补偿器包括基本圆形的相位结构,其具有布置在第一辐射束和第二辐射束的路径中的环形区域。 所述环形区域适于对所述第一辐射束赋予波前修正,对所述环形区域上的辐射在所述扫描点(16)的区域上产生相消干涉; 以及对所述第二辐射束的波前修改以补偿球面像差。 本发明的另一方面涉及一种用于限定辐射束的数值孔​​径的光学元件。 光学补偿器或光学元件可用于两个或三个波长系统。 本发明还公开了一种光学扫描头和使用光学补偿器的光学扫描装置。 本发明还涉及一种光学扫描头和光学扫描装置。
    • 18. 发明授权
    • Optical compensator for use in an optical scanning device
    • 用于光学扫描装置的光学补偿器
    • US07773490B2
    • 2010-08-10
    • US11721170
    • 2005-12-02
    • Joris Jan VrehenTeunis Willem Tukker
    • Joris Jan VrehenTeunis Willem Tukker
    • G11B7/135
    • G11B7/1275G02B27/0031G11B7/13922G11B2007/0006G11B2007/0013
    • An optical compensator is included in an optical scanning device for scanning optical record carriers. There are at least two different information layer depths within two different carriers. The scanning device produces first to third radiation beams respectively having different wavelengths for scanning first to third record carriers, respectively. The optical compensator has a non-periodic phase structure through which each radiation beam is arranged to pass. The non-periodic phase structure includes stepped annular zones separated by steps. The zones form a non-periodic radial pattern. The stepped annular zones introduce first to third different wavefront modifications into at least part of the first to third radiation beams, respectively. Radial height variations are included in the stepped annular zones, and are arranged such that non-zero contributions are provided to each wavefront modification by the optical compensator in each stepped annular zone.
    • 光学补偿器包括在用于扫描光学记录载体的光学扫描装置中。 两个不同载体内至少有两个不同的信息层深度。 扫描装置分别产生分别具有用于扫描第一至第三记录载体的不同波长的第一至第三辐射束。 光学补偿器具有非周期性相位结构,每个辐射束通过该相位结构通过。 非周期性相结构包括通过台阶隔开的阶梯状环状区域。 这些区域形成非周期性径向图案。 阶梯形环形区域分别将第一至第三不同波前修改引入至少部分第一至第三辐射束。 径向高度变化包括在阶梯形环形区域中,并且被布置成使得通过光学补偿器在每个阶梯状环形区域中为每个波前修改提供非零的贡献。
    • 19. 发明申请
    • OPTICAL COMPENSATOR FOR USE IN AN OPTICAL SCANNING DEVICE
    • 用于光学扫描装置的光学补偿器
    • US20090252017A1
    • 2009-10-08
    • US11721170
    • 2005-12-02
    • Joris Jan VrehenTeunis Willem Tukker
    • Joris Jan VrehenTeunis Willem Tukker
    • G11B7/00
    • G11B7/1275G02B27/0031G11B7/13922G11B2007/0006G11B2007/0013
    • An optical compensator for use in an optical scanning device for scanning optical record carriers, there being at least two different information layer depths within two different ones of the carriers, the optical record carriers including a first optical record carrier (3′), a second optical record carrier and a third optical record carrier, the scanning device including a radiation source system (7) for producing first, second and third radiation beams for scanning the first, second and third record carriers, respectively, the first, second and third radiation beams having different predetermined wavelengths. The optical compensator has a non-periodic phase structure through which each of the first, second and third radiation beams are arranged to pass, the non-periodic phase structure including a plurality of stepped annular zones separated by steps, the zones forming a non-periodic radial pattern, the stepped annular zones introducing first, second and third different wavefront modifications into at least part of the first, second and third radiation beams, respectively. The optical compensator includes radial height variations in the plurality of stepped annular zones, the radial height variations being arranged such that non-zero contributions are provided to each of the first, second and third wavefront modifications by the optical compensator in each of the stepped annular zones.
    • 一种用于扫描光学记录载体的光学扫描装置的光学补偿器,在两个不同的载体内存在至少两个不同的信息层深度,光学记录载体包括第一光学记录载体(3'),第二个光学记录载体 光学记录载体和第三光学记录载体,所述扫描装置包括辐射源系统(7),用于产生用于分别扫描第一,第二和第三记录载体的第一,第二和第三辐射束,第一,第二和第三辐射 具有不同预定波长的光束。 光学补偿器具有非周期相位结构,第一,第二和第三辐射束中的每一个被布置成通过,非周期性相位结构包括由台阶分隔开的多个阶梯状环形区域, 所述阶梯形环形区域分别将第一,第二和第三不同波前修改引入到第一,第二和第三辐射束的至少一部分中。 光学补偿器包括多个阶梯形环形区域中的径向高度变化,径向高度变化被布置成使得通过光学补偿器在每个阶梯形环形部分中的每个第一,第二和第三波前修正提供非零贡献 区域。