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    • 22. 发明授权
    • Optical scanning apparatus
    • US06445483B1
    • 2002-09-03
    • US08886469
    • 1997-07-01
    • Kyu TakadaNozomu InoueTakashi HamaYujiro Nomura
    • Kyu TakadaNozomu InoueTakashi HamaYujiro Nomura
    • G02B2608
    • An improved optical scanning apparatus is adapted to be such that at either end of the scan range, an optical beam deflected by a reflecting surface of a scanner will pass through an anamorphic lens in scanning optics at a position spaced from its optical axis in the sub-scanning direction. The anamorphic lens has such a sectional profile in the sub-scanning direction that the lens thickness at one end of the sub-scanning direction differs from the thickness at the other end. Also, a high speed optical scanning apparatus based on the dual incidence and the oblique incidence, can prevent a positional variation of a scanning line that is due to a shift of each facet of the rotating polygonal mirror, which is caused by an offset of the rotating axis of the rotating polygonal mirror. The scanning apparatus includes a light source, a rotating polygonal mirror with a plural number of reflecting surfaces for reflecting and deflecting an optical beam emitted from the light source, transfer optics for receiving the optical beam that is reflected and deflected by a first reflecting surface of the rotating polygonal mirror and transferring the optical beam to a second reflecting surface of the mirror, and scanning optics for scanning a scanned surface with the optical beam that is reflected and deflected by the second reflecting surface.
    • 24. 发明授权
    • Optical scanner
    • 光学扫描仪
    • US5673136A
    • 1997-09-30
    • US604901
    • 1996-02-22
    • Nozomu InoueTakashi HamaYujiro NomuraKyu Takada
    • Nozomu InoueTakashi HamaYujiro NomuraKyu Takada
    • B41J2/44G02B7/00G02B26/10G02B26/12G03G15/04G02B26/08
    • G02B7/008G02B26/12
    • An optical scanner that has a simple construction and which yet exhibits satisfactory imaging performance under varying temperature conditions. Of the two orthogonal scanning cross sections of scanning optics (i.e., the main and sub-scanning cross sections), the one that involves the greater movement of the image plane due to the temperature-dependent changes in optical characteristics (e.g. the variation in the operating wavelength of a light source, the index variation of a lens material and the thermal expansion of a lens itself) is adapted to be the same as the other cross section that involves the greater movement of the image plane due to the change in the distance from the light source to a collimator lens. If necessary, additional correction is effected in such a way that the scanning cross section that involves the greater overall movement of the image plane after correction for temperature changes is adapted to be different from the cross section that involves the greater amount of optical field curvature.
    • 一种光学扫描仪,具有简单的结构,并且在变化的温度条件下表现出令人满意的成像性能。 在扫描光学器件的两个正交扫描横截面(即主扫描和副扫描截面)中,由于光学特性的温度依赖性变化(例如, 光源的工作波长,透镜材料的折射率变化和透镜本身的热膨胀)适合于与由于距离变化引起的图像平面更大移动的另一横截面相同 从光源到准直透镜。 如果需要,进行附加的校正,使得在校正温度变化之后涉及图像平面的更大整体运动的扫描横截面适于与涉及更大量的光场曲率的横截面不同。