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1. 发明授权

US5969346A Laser beam scanning optical apparatus 失效
标题翻译：激光束扫描光学仪器
公开(公告)号：US5969346A
公开(公告)日：1999-10-19
申请号：US887460
申请日：1997-07-02
申请人： Yasushi Nagasaka , Kenji Takeshita , Hiroshi Hiraguchi , Jun Kohsaka , Nobuo Kanai , Keiji Ogoh
发明人： Yasushi Nagasaka , Kenji Takeshita , Hiroshi Hiraguchi , Jun Kohsaka , Nobuo Kanai , Keiji Ogoh
IPC分类号： G02B26/12 , H01J3/14 , G01J1/20 , G02B26/08
CPC分类号： G02B26/128
摘要： A laser beam scanning optical apparatus which images and scans a laser beam emitted from a laser diode on a photo-sensitive drum through a focusing lens, a polygon mirror and an f.theta. lens. An SOS photosensor detects the scanned laser beam and generates a detection signal. The laser diode is controlled to perform pulse emission a specified time after the generation of the detection signal. The pulse beam is incident to a beam detector which adopts a knife edge method, and the amount of a focal shift is detected. The focusing lens is moved along the optical axis in accordance with the detected amount of a focal shift to correct the position of the image point.
摘要翻译：一种激光束扫描光学装置，其通过聚焦透镜，多面镜和fθ透镜对从感光鼓上的激光二极管发射的激光束进行成像和扫描。 SOS光电传感器检测扫描的激光束并产生检测信号。控制激光二极管在产生检测信号之后的指定时间内执行脉冲发射。脉冲光束入射到采用刀刃法的光束检测器，并检测焦点偏移量。根据检测到的焦点偏移量，聚焦透镜沿着光轴移动以校正图像点的位置。

2. 发明授权

US5856669A Laser beam scanning optical apparatus having means for generating moire fringes 失效
标题翻译：具有用于产生莫尔条纹的装置的激光束扫描光学装置
公开(公告)号：US5856669A
公开(公告)日：1999-01-05
申请号：US696066
申请日：1996-08-13
申请人： Yasushi Nagasaka , Kenji Takeshita , Hiroshi Hiraguchi , Jun Kohsaka , Nobuo Kanai , Keiji Ogoh
发明人： Yasushi Nagasaka , Kenji Takeshita , Hiroshi Hiraguchi , Jun Kohsaka , Nobuo Kanai , Keiji Ogoh
IPC分类号： B41J2/44 , B41J2/47 , G02B26/10 , G02B26/12 , G02B27/60
CPC分类号： B41J2/471 , G02B26/128 , G02B27/60
摘要： A laser beam scanning optical apparatus which has Moire fringes generating elements which is located near a position optically equivalent to a scanning surface and modulates a laser beam emitted from a laser source to generate Moire fringes. The Moire fringes generating elements comprises, for example, a first filter which has spatial grating and a second filter which has spatial grating which slants slightly with respect to the spatial grating of the first filter, the first filter and the second filter being arranged upstream and downstream respectively in an optical path. The laser beam scanning optical apparatus further has a light receiving element for receiving the Moire fringes generated by the Moire fringes generating elements. Focusing means for correcting a position of an image point of the laser beam is driven in accordance with an output of the light receiving element. For example, the light receiving element is a photoelectric element with a plurality of light receiving surfaces, each of which generates an electric signal in accordance with the laser beam incident thereto, and from a phase difference between the electric signals, the position of the image point is detected.
摘要翻译：一种激光束扫描光学装置，其具有位于光学上等同于扫描表面的位置附近的莫尔条纹产生元件，并且调制从激光源发射的激光束以产生莫尔条纹。莫尔条纹生成元件包括例如具有空间光栅的第一滤光器和具有相对于第一滤光器的空间光栅稍微倾斜的空间光栅的第二滤光器，第一滤光器和第二滤光器布置在上游，分别在光路中。激光束扫描光学装置还具有用于接收由莫尔条纹生成元件产生的莫尔条纹的光接收元件。根据光接收元件的输出来驱动用于校正激光束的图像点的位置的聚焦装置。例如，光接收元件是具有多个光接收表面的光电元件，每个光接收表面根据入射到其的激光束产生电信号，并且根据电信号之间的相位差，图像的位置点检测。

3. 发明授权

US5808775A Laser beam scanning optical apparatus 失效
标题翻译：激光束扫描光学仪器
公开(公告)号：US5808775A
公开(公告)日：1998-09-15
申请号：US814217
申请日：1997-03-11
申请人： Yoshihiro Inagaki , Nobuo Kanai , Jun Kohsaka , Kenji Takeshita , Keiji Ogoh , Hidenari Tachibe
发明人： Yoshihiro Inagaki , Nobuo Kanai , Jun Kohsaka , Kenji Takeshita , Keiji Ogoh , Hidenari Tachibe
IPC分类号： B41J2/44 , G02B13/00 , G02B13/18 , G02B26/10 , G02B26/12 , G02B26/08
CPC分类号： G02B26/124
摘要： A laser beam scanning optical apparatus which has a laser source unit, a collimator lens, a cylindrical lens, a polygon mirror and a scanning lens with an f.theta. function. The collimator lens is a bifocal lens, and because of the bifocal collimator lens, a part of the laser beam is focused on a point before the surface of a photosensitive member, and another part of the laser beam is focused on a point after the surface of the photosensitive member. Also, the cylindrical lens can be a bifocal lens. In this case, even when the magnification ratio in the sub scanning direction is designed small, the focal length of the cylindrical lens does not have to be lengthened.
摘要翻译：一种具有激光源单元，准直透镜，柱面透镜，多面镜和具有fθ函数的扫描透镜的激光束扫描光学装置。准直透镜是双焦点透镜，并且由于双焦点准直透镜，激光束的一部分聚焦在感光构件表面之前的点，并且激光束的另一部分聚焦在表面之后的点的光敏元件。此外，柱面透镜可以是双焦点透镜。在这种情况下，即使将副扫描方向的倍率设计得较小，也不必延长柱面透镜的焦距。

4. 发明授权

US06690486B1 Image forming apparatus with excellent gradation reproduction 失效
标题翻译：图像形成装置具有优异的灰度再现性
公开(公告)号：US06690486B1
公开(公告)日：2004-02-10
申请号：US09361956
申请日：1999-07-27
申请人： Keiji Ogoh , Osamu Yamada
发明人： Keiji Ogoh , Osamu Yamada
IPC分类号： G06L1500
CPC分类号： H04N1/4005 , G06K15/1209 , G06K15/1223 , H04N1/40037
摘要： An image forming apparatus forms an image with a gradation by scanning an image carrying member with a light beam based on image data. The beam is generated by using a light beam generating element capable of independently varying the beam output and the beam diameter. The output of the beam generating element is controlled based on the gradation level (density level) of the image data and the diameter of the beam from the element is controlled based on the gradation level. In short, the output of the light beam generating element and the beam diameter are controlled individually. Therefore, the exposed area of the surface of the image carrying member can be controlled properly by controlling the beam diameter as well as the output of the light beam generating unit. As a result, there can be obtained an image forming apparatus having excellent gradation reproduction over all the density regions. In controlling the output of the light beam generating element, there are cases where a light emitting time per dot is controlled or the beam intensity is controlled, depending on the gradation level of image data.
摘要翻译：图像形成装置基于图像数据通过用光束扫描图像承载构件来形成具有灰度的图像。通过使用能够独立地改变光束输出和光束直径的光束产生元件来产生光束。基于图像数据的灰度级（浓度级）控制光束产生元件的输出，并且基于灰度级控制来自元件的光束的直径。简而言之，单独控制光束产生元件的输出和光束直径。因此，可以通过控制光束直径以及光束产生单元的输出来适当地控制图像承载部件的表面的暴露区域。结果，可以获得在所有密度区域上具有优异的灰度再现的图像形成装置。在控制光束产生元件的输出时，存在根据图像数据的灰度等级来控制每点的发光时间或者控制光束强度的情况。

5. 发明授权

US5890789A Multi-beam emitting device having an acoustooptic element 失效
标题翻译：具有声光元件的多光束发射装置
公开(公告)号：US5890789A
公开(公告)日：1999-04-06
申请号：US972803
申请日：1997-11-18
申请人： Yoshihiro Inagaki , Toshio Naiki , Akiyoshi Hamada , Keiji Ogoh
发明人： Yoshihiro Inagaki , Toshio Naiki , Akiyoshi Hamada , Keiji Ogoh
IPC分类号： G02F1/11 , G02F1/33 , G02F1/335
CPC分类号： G02F1/113 , G02F1/33 , G02F1/335
摘要： A multi-beam emitting device which splits a light beam emitted from a light source into a plurality of beams with a beam splitter to emit a plurality of beams. As the beam splitter, an optical waveguide type acoustooptic element or the like is used. A multi-beam emitting device according to the present invention has a beam splitter which drives an acoustooptic element with a plurality of electric signals with different frequencies applied thereto so as to deflect a light beam emitted from a light source and split the light beam into a plurality of beams, a signal generator which generates the electric signals with different frequencies which are used for the drive of the acoustooptic element, a modulating circuit which turns on and off the electric signals generated by the signal generater individually based on a data signal, an intensity control circuit which controls the light source to change the intensity of the light beam emitted therefrom. Another multi-beam emitting device has a beam splitter which deflects a light beam emitted from a light source and splits the light beam into an even number of beams, a shutting member which shuts out a half of the beams, a modulating circuit which controls the beam splitter so that the total quantity of light of the beams which are emergent from the beam splitter and not shut out by the shutting member and the beams which are emergent from the beam splitter and shut out by the shutting member will be constant. Further, in these multi-beam emitting devices, the deflecting position of the light beam and the beam waist position of the light beam are inside the optical waveguide type acoustooptic element at a specified distance from each other.
摘要翻译：一种多光束发射装置，其用光束分离器将从光源发射的光束分解成多个光束，以发射多个光束。作为分束器，使用光波导型声光元件等。根据本发明的多光束发射装置具有分束器，该分束器利用施加到其上的具有不同频率的多个电信号驱动声光元件，以偏转从光源发射的光束并将光束分成多个光束，产生用于驱动声光元件的具有不同频率的电信号的信号发生器，基于数据信号单独地导通和关断由信号发生器产生的电信号的调制电路，强度控制电路，其控制光源以改变从其发射的光束的强度。另一种多光束发射装置具有一个分束器，该光束分离器使从光源发出的光束偏转，并将光束分裂成偶数个光束，一个关闭光束的一半的关闭部件，一个调制电路，使得从分束器出射并且不被关闭构件遮断的光束和从分束器射出并被关闭构件遮断的光束的总光量将是恒定的。此外，在这些多光束发射装置中，光束的偏转位置和光束的光束腰部位置在彼此指定距离的光波导型声光元件内。

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