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    • 25. 发明授权
    • Scanning optical apparatus with reduced wave aberration
    • 具有降低波像差的扫描光学设备
    • US06825870B2
    • 2004-11-30
    • US10364523
    • 2003-02-12
    • Manabu Kato
    • Manabu Kato
    • B41J2700
    • G02B26/124G02B26/125
    • A scanning optical apparatus includes a first optical element for converting a state of light beam emitted from a light source into another state, a second optical element for converting the light beam from the first optical element into a line image elongated in a main scanning direction, a deflecting element for deflecting and scanning the light beam from the second optical element, and a scanning optical element for forming an image of the light beam deflected by the deflecting element on a surface to be scanned with a spot-like shape. A deflecting surface of the deflecting element and the surface to be scanned are nearly conjugate in a sub scanning cross section. The position where the wave aberration in the sub scanning cross section of the light beam on an optical axis in the deflected light beam becomes least is located on the side of the deflecting element with respect to the surface to be scanned.
    • 扫描光学装置包括用于将从光源发射的光束的状态转换为另一状态的第一光学元件,用于将来自第一光学元件的光束转换成沿主扫描方向延伸的线条图像的第二光学元件, 用于偏转和扫描来自第二光学元件的光束的偏转元件,以及用于在点状形状的待扫描表面上形成由偏转元件偏转的光束的图像的扫描光学元件。 偏转元件的偏转表面和待扫描的表面在副扫描横截面中几乎共轭。 偏转光束中光束的副扫描横截面中的波像差最小的位置位于偏转元件相对于待扫描表面的一侧。
    • 27. 发明授权
    • Actuator for oscillator
    • 振荡器执行器
    • US06497147B2
    • 2002-12-24
    • US09809223
    • 2001-03-16
    • Manabu KatoHideya Kurachi
    • Manabu KatoHideya Kurachi
    • G01P904
    • G01C19/5719
    • An actuator for an oscillator which is capable of minimizing the fluctuation of the detection error of the oscillation condition of an electrostatic driven oscillator and shortening rise time of the oscillation amplitude of the electrostatic driven oscillator during starting. An actuator oscillates a drive frame and a detecting frame in the X-direction by outputting the drive signal to an electrode and detects the displacement of the drive frame in the X-direction as the displacement signal. The actuator generates a direct-current voltage component of the drive signal controlled to be increased or decreased based on the detected displacement signal and an alternating voltage component of the drive signal having a constant amplitude to maintain the constancy of the oscillation amplitude of the drive frame based on the detected displacement signal. During starting, the actuator generates an alternating voltage component of the drive signal having a larger amplitude compared to at normal operation condition.
    • 一种用于振荡器的致动器,其能够最小化静电驱动振荡器的振荡条件的检测误差的波动,并且缩短启动期间静电驱动振荡器的振荡幅度的上升时间。 执行器通过将驱动信号输出到电极并且将驱动框架在X方向上的位移作为位移信号来将驱动框架和检测框架在X方向上振荡。 致动器基于检测到的位移信号和具有恒定振幅的驱动信号的交流电压分量产生被控制为增加或减小的驱动信号的直流电压分量,以维持驱动框架的振荡幅度的恒定性 基于检测到的位移信号。 在启动期间,致动器产生与正常操作条件相比具有较大振幅的驱动信号的交流电压分量。
    • 29. 发明授权
    • Semiconductor laser
    • 半导体激光器
    • US5604764A
    • 1997-02-18
    • US611089
    • 1996-03-05
    • Takashi MotodaManabu Kato
    • Takashi MotodaManabu Kato
    • H01S5/16H01S5/22H01S5/227H01S3/19
    • H01S5/227H01S5/164H01S5/2227H01S5/2272Y10S117/913
    • A method of fabricating a semiconductor laser includes forming a mask having a stripe opening in a direction on a {100} surface of a first conductivity type substrate, and growing a double-heterojunction structure including a first conductivity type cladding layer, an active layer, and a second conductivity type cladding layer on the {100} surface using the mask, thereby producing a stripe-shaped ridge in which the active layer and the first conductivity type lower cladding layer are covered with the second conductivity type upper cladding layer. The stripe-shaped ridge has an ordinary mesa-shaped cross-section in a direction perpendicular to the stripe direction and a symmetrical hexagonal cross-section in the stripe direction. In this method, since the conventional selective etching for forming the ridge is dispensed with, the processing precision of the ridge is improved. Further, the second conductivity type cladding layer and the active layer grown on the side surfaces of the first conductivity type cladding layer are very thin and have low dopant incorporating efficiencies, so that portions of the first conductivity type cladding layer grown at the side surfaces of the ridge have high resistivity, and reactive current is blocked by these high-resistance portions.
    • 一种制造半导体激光器的方法包括:在第一导电型衬底的{100}表面上形成具有沿<011>方向的条纹开口的掩模,并且生长包括第一导电类型包覆层的双异质结结构 使用掩模在{100}表面上形成第二导电型包覆层,由此产生条状脊,其中有源层和第一导电类型下覆盖层被第二导电类型上包层覆盖 。 条形脊在垂直于条纹方向的方向上具有普通的台面状横截面,并且在条带方向上具有对称的六边形横截面。 在该方法中,由于省去了用于形成脊的常规选择性蚀刻,所以提高了脊的加工精度。 此外,在第一导电型包覆层的侧面上生长的第二导电型包覆层和有源层非常薄,并且具有低掺杂剂结合效率,使得在第一导电类型包层的侧表面生长的部分 脊具有高电阻率,并且无功电流被这些高电阻部分阻挡。
    • 30. 发明授权
    • Optical scanning apparatus having tilted scanning lens system
    • 具有倾斜扫描透镜系统的光学扫描装置
    • US5557446A
    • 1996-09-17
    • US44070
    • 1993-04-08
    • Manabu Kato
    • Manabu Kato
    • G02B26/10G02B26/12G02B26/08
    • G02B26/124
    • In an optical scanning apparatus, there are arranged a light source, a first optical system for converting a light beam emitted from the light source to a convergent light beam, a deflector for deflecting the convergent light beam from the first optical system, and a second optical system for image-forming the convergent light beam deflected by the deflector as a spot on a surface to be scanned. The symmetrical axis of the second optical system with respect to a main-scanning direction is disposed so as to have an inclination relative to a normal to the scanned surface in a main-scan cross section. As a result, aberrations of the optical scanning apparatus, especially degradation of f.theta. characteristics due to backward and forward movement of a mirror surface caused by the rotation of the polygon mirror, which occur in an optical scanning system wherein a convergent, light beam is caused to enter the polygon mirror, are reduced.
    • 在光学扫描装置中,设置有光源,将从光源发射的光束转换为会聚光束的第一光学系统,用于使来自第一光学系统的会聚光束偏转的偏转器,以及第二光学系统 光学系统,用于将由偏转器偏转的会聚光束图像形成为待扫描表面上的点。 第二光学系统相对于主扫描方向的对称轴被设置成在主扫描截面中具有相对于扫描表面的法线的倾斜度。 结果,在光学扫描系统中发生的光学扫描装置的像差,特别是由于由多面镜的旋转引起的镜面的向后和向前移动导致的fθ特性的劣化,其中会聚的光束是 导致进入多面镜,减少。