公开(公告)号：US20040218242A1

公开(公告)日：2004-11-04

申请号：US10663643

申请日：2003-09-17

Applicant: PENTAX Corporation

Inventor： Shuichi Takeuchi ,  Daisuke Koreeda

IPC: B41J002/385 ,  G03G013/04 ,  G02B026/08

CPC classification number: G06K15/1209 ,  G02B26/124 ,  G03G15/0435

Abstract: In a scanning optical system, a partial light blocking member having an annular light blocking part (for blocking off part of the incident laser beam entering the annular area around the central axis of the laser beam) is placed on an optical path between the laser light source and the polygon mirror. The scanning optical system including such a partial light blocking member is installed in a printer. By the effect of the partial light blocking member, the intensity of side lobes (several rings of light accompanying the main beam) is prevented from exceeding a threshold value even when optical surfaces of an imaging optical system of the scanning optical system have certain microscopic undulations, by which black stripes occurring in halftone printing can be eliminated.

Abstract translation: 在扫描光学系统中，具有环形遮光部分（用于阻挡入射到激光束的中心轴线周围的环形区域的入射激光束的一部分的部分遮光部件）被放置在激光 源和多面镜。 包括这种部分遮光构件的扫描光学系统安装在打印机中。 通过部分遮光构件的作用，即使在扫描光学系统的成像光学系统的光学表面具有特定的微小波动的情况下，也防止了旁瓣（伴随主光束的几个光环）的强度超过阈值 可以消除在半色调印刷中发生的黑色条纹。

公开(公告)号：US20030146376A1

公开(公告)日：2003-08-07

申请号：US10356490

申请日：2003-02-03

Applicant: PENTAX Corporation

Inventor： Daisuke Koreeda

IPC: H01J003/14 ,  H01J005/16

CPC classification number: G02B26/125

Abstract: A scanning optical system includes first and a second lens elements, at least one of which is a plastic lens element. Each surface of the plastic lens element is an aspherical surface that is configured such that a shape in a main scanning plane is defined as a function of a distance, in the main scanning direction, from a surface reference axis thereof, and that a curvature in an auxiliary scanning plane which is perpendicular to the main scanning plane is defined as another function of a distance, in the main scanning direction, from the surface reference axis. At least one of the two surfaces of the plastic lens element are arranged such that the surface reference axis thereof is decentered from an axis of the beam in the auxiliary scanning direction.

Abstract translation: 扫描光学系统包括第一和第二透镜元件，其中至少一个是塑料透镜元件。 塑料透镜元件的每个表面是非球面，其被构造成使得主扫描平面中的形状被定义为在主扫描方向上从其表面参考轴线的距离的函数，并且曲率 垂直于主扫描平面的辅助扫描平面被定义为在主扫描方向上距离表面参考轴的距离的另一个函数。 塑料透镜元件的两个表面中的至少一个被布置成使得其表面参考轴线在辅助扫描方向上从光束的轴线偏心。

公开(公告)号：US20040155950A1

公开(公告)日：2004-08-12

申请号：US10652033

申请日：2003-09-02

Applicant: PENTAX Corporation

Inventor： Shuichi Takeuchi ,  Daisuke Koreeda

IPC: B41J002/385 ,  G03G013/04

CPC classification number: G02B27/0988 ,  G02B26/124 ,  G02B27/58

Abstract: A phase shift element having a central area (for transmitting part of an incident laser beam in the vicinity of the beam central axis) and a first area (giving the laser beam incident thereon a phase difference null relative to a beam passing through the central area) is placed on an optical path between a laser light source and a polygon mirror of a scanning optical system. The scanning optical system including such a phase shift element is installed in a printer. By the effect of the phase shift element, the intensity of side lobes (several rings of light accompanying the main beam) is prevented from exceeding a threshold value even when optical surfaces of an imaging optical system of the scanning optical system have certain microscopic undulations, by which black stripes occurring in halftone printing can be eliminated.

Abstract translation: 一种相移元件，其具有中心区域（用于传递入射激光束在光束中心轴附近的一部分）和第一区域（给予入射到其上的激光束相对于穿过中心区域的光束的相位差pi） ）放置在扫描光学系统的激光光源和多面镜之间的光路上。 包括这种相移元件的扫描光学系统安装在打印机中。 通过相移元件的作用，即使在扫描光学系统的成像光学系统的光学表面具有一定的微小波动的情况下，也能够防止旁瓣（伴随主光束的几个光环）的强度超过阈值， 可以消除在半色调印刷中出现的黑色条纹。

公开(公告)号：US20030231407A1

公开(公告)日：2003-12-18

申请号：US10456674

申请日：2003-06-09

Applicant: PENTAX Corporation

Inventor： Daisuke Koreeda ,  Koichi Maruyama

IPC: G02B003/02 ,  G02B013/18

CPC classification number: G11B7/1374 ,  G02B3/08 ,  G02B7/028 ,  G11B7/13922

Abstract: An objective lens for an optical pickup has a single lens element. One surface of the objective lens is divided into a central area and a peripheral area, and a step providing a level difference along a direction of the optical axis is formed at a boundary therebetween. The step provides a phase shift between light passing through the central area and the peripheral area. The level difference is formed such that a thickness on the peripheral area side is greater than a thickness on the central area side at the boundary. In one case, the objective lens satisfies a condition:0.83

Abstract translation: 用于光学拾取器的物镜具有单个透镜元件。 物镜的一个表面被分成中心区域和周边区域，并且在它们之间的边界处形成沿着光轴方向提供水平差的台阶。 该步骤提供穿过中心区域的光和外围区域之间的相移。 水平差形成为周边区域侧的厚度大于边界处的中央区域侧的厚度。 在一种情况下，物镜满足条件：0.83

公开(公告)号：US20040174581A1

公开(公告)日：2004-09-09

申请号：US10792737

申请日：2004-03-05

Applicant: PENTAX Corporation

Inventor： Takashi Iizuka ,  Daisuke Koreeda

IPC: G02B026/08

CPC classification number: G02B26/123

Abstract: A scanning optical system includes a polygonal mirror that deflects the even number of beams, which are incident thereon along optical paths arranged symmetrically with respect to a plane perpendicular to a rotation axis thereof. An imaging optical system for converging the beams includes lenses for converging the beam, in an auxiliary scanning direction, respectively. The lenses have the same shapes, and are arranged symmetrically with respect to the plane. The orientation of the lenses on one side of the plane is oriented oppositely, in the auxiliary scanning direction, to the other lenses located on the other side of the plane.

Abstract translation: 扫描光学系统包括多边形镜，其使沿着与其旋转轴线垂直的平面对称布置的光路入射到其上的偶数个光束。 用于会聚光束的成像光学系统包括用于在辅助扫描方向上会聚光束的透镜。 透镜具有相同的形状，并且相对于平面对称地布置。 在该平面的一侧上的透镜的取向在辅助扫描方向上相对于位于该平面另一侧的其它透镜。

公开(公告)号：US20040150892A1

公开(公告)日：2004-08-05

申请号：US10761318

申请日：2004-01-22

Applicant: PENTAX Corporation

Inventor： Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

IPC: G02B003/02 ,  G02B013/18

CPC classification number: G11B7/1353 ,  G11B7/1374 ,  G11B7/1378 ,  G11B7/13922 ,  G11B2007/0006

Abstract: There is provided an optical system of an optical pick-up for a plurality of types of optical discs, which is provided with a plurality of light sources that support the plurality of types of optical discs, a first coupling lens that is used at least for the first optical disc, and an objective lens that is used for the plurality of types of optical discs. A beam for the first optical disc emitted by the plurality of light sources passes through the first coupling lens and is incident on the objective lens as a diverging beam, the diverging beam being given spherical aberration by the coupling lens. When the objective lens shift occurs, a coma component relating to the spherical aberration of the diverging beam which is shifted with respect to the objective lens due to the shift of the objective lens is canceled by a coma generated by the objective lens and the cover layer of the first optical disc.

Abstract translation: 提供了一种用于多种类型的光盘的光学拾取器的光学系统，其具有支撑多种类型的光盘的多个光源，第一耦合透镜至少用于 第一光盘和用于多种类型的光盘的物镜。 用于由多个光源发射的第一光盘的光束通过第一耦合透镜并作为发散光束入射在物镜上，发散光束由耦合透镜给予球面像差。 当发生物镜偏移时，由于物镜的偏移而相对于物镜偏移的发散光束的球面像差的彗差成分被物镜和覆盖层产生的彗形消除 的第一光盘。

公开(公告)号：US20030210639A1

公开(公告)日：2003-11-13

申请号：US10430212

申请日：2003-05-07

Applicant: PENTAX Corporation

Inventor： Shuichi Takeuchi ,  Koichi Maruyama ,  Daisuke Koreeda

IPC: G11B007/135

CPC classification number: G11B7/139 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/0006

Abstract: An objective lens for an optical pickup is configured such that, when a light beam having a wavelength corresponding to the optical disc requiring the higher NA is converged on the optical disc requiring the higher NA at the higher NA, the phase of light flux passed through the peripheral area is substantially the same as that passed through the central area. When a light beam having a wavelength corresponding to the optical disc requiring the lower NA is converged on the optical disc requiring the lower NA at the lower NA, the phase of light flux passed through a first annular region included in the peripheral area is different from that passed through the central area, and the phase of light flux passed through a second annular region, which is outside the first region, is substantially the same as that passed through the central area.

Abstract translation: 用于光学拾取器的物镜被配置为使得当具有对应于需要较高NA的光盘的波长的光束会聚在需要较高NA的较高NA的光盘上时，光通量的相位通过 周边区域与通过中心区域的区域基本相同。 当具有对应于需要较低NA的光盘的波长的光束会聚在需要较低NA的较低NA的光盘上时，通过包括在周边区域中的第一环形区域的光通量的相位不同于 并且通过第一区域外的第二环状区域的光束的相位与穿过中央区域的光通量大致相同。

公开(公告)号：US20030142380A1

公开(公告)日：2003-07-31

申请号：US10290161

申请日：2002-11-08

Applicant: PENTAX Corporation

Inventor： Daisuke Koreeda

IPC: G02B026/08 ,  B41J015/14 ,  B41J027/00

CPC classification number: G02B26/125 ,  G02B26/123

Abstract: There is provided a scanning optical system, which is provided with a deflector that deflects the plurality of beams, and an imaging optical system that converges the plurality of beams deflected by the deflector to form a plurality of beam spots on surfaces to be scanned, respectively. The imaging optical system has at least one lens whose position is changeable in a plane including an optical reference axis thereof and parallel with the main scanning direction. In this configuration, the imaging optical system satisfies a condition: 0.05

Abstract translation: 提供了一种扫描光学系统，其设置有偏转多个光束的偏转器，以及成像光学系统，其收敛由偏转器偏转的多个光束，以在待扫描的表面上分别形成多个光束点 。 成像光学系统具有至少一个透镜，其位置在包括其光学参考轴并且与主扫描方向平行的平面中是可变的。 在该结构中，成像光学系统满足条件：0.05

公开(公告)号：US20040246873A1

公开(公告)日：2004-12-09

申请号：US10859140

申请日：2004-06-03

Applicant: PENTAX Corporation

Inventor： Koichi Maruyama ,  Daisuke Koreeda

IPC: G11B005/58

CPC classification number: G11B7/1374

Abstract: There is provided an objective lens used for at least three types of optical discs. When thicknesses of a first, second and third optical discs are respectively represented by t1, t2 and t3, t1 is 0.6 mm, t2 is 0.6 mm, and t3 is 1.2 mm. When numerical apertures for the first, second and third optical discs are respectively represented by NA1, NA2 and NA3, a relationship NA1nullNA2>NA3 is satisfied. When the first and second optical discs are used, collimated light beams is incident on the objective lens. When the third optical disc is used, a diverging beam is incident on the objective lens. The following conditions are satisfied: null0.02

Abstract translation: 提供了用于至少三种类型的光盘的物镜。 当第一，第二和第三光盘的厚度分别由t1，t2和t3表示时，t1为0.6mm，t2为0.6mm，t3为1.2mm。 当第一，第二和第三光盘的数值孔径分别由NA1，NA2和NA3表示时，满足关系NA1> = NA2> NA3。 当使用第一和第二光盘时，准直光束入射到物镜上。 当使用第三光盘时，发散光束入射到物镜上。 满足以下条件：-0.02

公开(公告)号：US20040114028A1

公开(公告)日：2004-06-17

申请号：US10721908

申请日：2003-11-26

Applicant: PENTAX Corporation

Inventor： Shuichi Takeuchi ,  Daisuke Koreeda

IPC: B41J002/385

CPC classification number: G02B5/1895 ,  B41J2/471 ,  G02B5/1876 ,  G02B26/124

Abstract: There is provided a scanning optical system including a collimator lens being placed on an optical path between a light source and a deflecting system. At least one of a front surface and a rear surface of the collimator lens includes a central area through which part of the laser beam in the vicinity of a central axis of the laser beam passes, at least one first outer area having an effect on the laser beam so that the laser beam after passing through said at least one first outer area is given a first phase difference not including a phase difference of zero, and at least one second outer area having an effect on the laser beam so that the laser beam after passing through said at least one second outer area is given a second phase difference being different from the first phase difference and including a phase difference of zero.

Abstract translation: 提供了一种扫描光学系统，其包括放置在光源和偏转系统之间的光路上的准直透镜。 准直透镜的前表面和后表面中的至少一个包括激光束的中心轴附近的激光束的一部分通过的中心区域，至少一个第一外部区域， 激光束，使得在穿过所述至少一个第一外部区域之后的激光束被给予不包括零相位差的第一相位差和至少一个对激光束具有影响的第二外部区域，使得激光束 在通过所述至少一个第二外部区域之后，给予不同于第一相位差并包括零相位差的第二相位差。