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    • 5. 发明申请
    • Magnetic disk drive
    • 磁盘驱动器
    • US20070211371A1
    • 2007-09-13
    • US11709979
    • 2007-02-22
    • Takenori AtsumiAtsushi Okuyama
    • Takenori AtsumiAtsushi Okuyama
    • G11B5/596
    • G11B5/5547G11B5/5582
    • Embodiments in accordance with the present invention relate to a positioning control system of a magnetic disk drive. Even if there is no phase correlation in a specific vibration component before and after a seek operation of a magnetic head, a resonance filter in accordance with an embodiment of the present invention follows the vibration at the frequency at high speed. A frequency showing a periodic disturbance is selected as a target frequency Ft[Hz]. A resonance filter showing a peak gain at a frequency Ft is designed. For an input to the resonance filter, a time-variable gain K(t) is used that varies depending on the time lapsed after the completion of a seek operation. This time-variable gain K(t) takes a value larger than 1 when the resonance filter starts operating, and after the lapse of a fixed length of time, the value becomes 1 by degrees.
    • 根据本发明的实施例涉及一种磁盘驱动器的定位控制系统。 即使在磁头搜索操作之前和之后的特定振动分量中没有相位相关,根据本发明的实施例的谐振滤波器跟随高频频率的振动。 选择显示周期性干扰的频率作为目标频率Ft [Hz]。 设计了表示频率Ft的峰值增益的共振滤波器。 对于谐振滤波器的输入,使用根据寻道操作完成之后经过的时间而变化的时变增益K(t)。 当谐振滤波器开始工作时,该时变增益K(t)取大于1的值,并且在经过固定时间长度之后,该值变为1度。
    • 6. 发明申请
    • WAVELENGTH-SELECTIVE POLARIZATION CONVERSION ELEMENT, PROJECTION DISPLAYING OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS
    • 波长选择性极化转换元件,投影显示光学系统和图像投影设备
    • US20070071043A1
    • 2007-03-29
    • US11531148
    • 2006-09-12
    • Yu YamauchiAtsushi OkuyamaReona Ushigome
    • Yu YamauchiAtsushi OkuyamaReona Ushigome
    • H01S3/10
    • G02B27/283G02B5/3041G02B27/288H04N9/3167
    • A wavelength-selective polarization conversion element is disclosed, which is capable of reducing the number of optical elements in an optical system and simplifying the configuration thereof. The polarization conversion element comprises a beam splitting film which splits light by transmission and reflection and has a characteristic in which at least its transmittance for light with a first polarization direction changes between a transmittance higher than 50% and a transmittance lower than 50% depending on wavelength regions, and a phase plate which converts the polarization direction of light from the beam splitting film between the first polarization direction and a second polarization direction. The polarization conversion element converts light of two of first, second and third wavelength regions into light with one of the first and second polarization directions and converts light of the remaining wavelength region into light with the other polarization direction.
    • 公开了一种波长选择性偏振转换元件,其能够减少光学系统中的光学元件的数量并简化其配置。 偏振转换元件包括通过透射和反射分离光的分束膜,并且具有这样的特性,其中至少其对于具有第一偏振方向的光的透射率在高于50%的透射率和低于50%的透射率之间变化,这取决于 以及在第一偏振方向和第二偏振方向之间转换来自分束膜的光的偏振方向的相位板。 偏振转换元件将第一,第二和第三波长区域中的两个的光转换为具有第一和第二偏振方向中的一个的光,并将剩余波长区域的光转换为具有另一个偏振方向的光。
    • 7. 发明授权
    • Color splitting/combining optical system and image projecting apparatus
    • 分色/组合光学系统和图像投影设备
    • US07137704B2
    • 2006-11-21
    • US10807814
    • 2004-03-23
    • Atsushi OkuyamaMasayuki Abe
    • Atsushi OkuyamaMasayuki Abe
    • G03B21/14G02F1/13363
    • H04N9/3105H04N9/3167
    • A color splitting/combining optical system includes a first optical member for color splitting and a second optical member which has a polarization splitting surface for color splitting/combining, a third optical member for color combining a first color-selective wave plates and a second color-selective wave plate. The first and second color-selective wave plates convert the polarization direction of light in a first and second wavelength regions respectively by 90 degrees. The optical system satisfies λ1≠λ2, where λ1 and λ2 represent wavelengths in which the ratio of the light component having the polarization direction converted by 90 degrees by the first and second color-selective wave plates respectively become substantially 50%.
    • 分色/组合光学系统包括用于分色的第一光学构件和具有用于分色/组合的偏振分离表面的第二光学构件,用于将第一颜色选择波片和第二颜色组合的第三光学构件 选择波片。 第一和第二颜色选择波片将第一和第二波长区域中的光的偏振方向分别转换90度。 光学系统满足λ1λ2,其中λ1和λ2表示第一和第二色选波片转换90度的偏振方向的光分量的比率分别变为50%的波长。
    • 8. 发明申请
    • Image projection apparatus and adjusting method used for the same
    • 图像投影装置及其调整方法相同
    • US20060066813A1
    • 2006-03-30
    • US11228605
    • 2005-09-16
    • Atsushi OkuyamaMakoto Takahashi
    • Atsushi OkuyamaMakoto Takahashi
    • G03B21/00
    • H04N9/3105H04N9/315
    • An image projection apparatus includes a first reflection type liquid crystal display device for modulating and reflecting red light, a second reflection type liquid crystal display device for modulating and reflecting green light, a third reflection type liquid crystal display device for modulating and reflecting blue light, the image projection apparatus projecting colored light made of the red, green and blue lights from the first to third reflection type liquid crystal display devices, a first ¼ wave plate provided on an optical path of the red light, a second ¼ wave plate provided on an optical path of the green light, and a third ¼ wave plate provided on an optical path of the blue light, a direction of a fast axis of the third ¼ wave plate being different from a direction that minimizes leakage light of the blue light.
    • 图像投影装置包括用于调制和反射红光的第一反射型液晶显示装置,用于调制和反射绿光的第二反射型液晶显示装置,用于调制和反射蓝光的第三反射型液晶显示装置, 所述图像投影装置投射由所述第一至第三反射型液晶显示装置的红色,绿色和蓝色光制成的彩色光,设置在所述红色光的光路上的第一1/4波片,设置在所述红色光的光路上的第二1/4波片 绿光的光路和设置在蓝光的光路上的第三1/4波片,第三1/4波片的快轴方向与蓝光的漏光最小化的方向不同。