公开(公告)号：US5889748A

公开(公告)日：1999-03-30

申请号：US772874

申请日：1996-12-26

申请人： Takeshi Shimano ,  Masayuki Inoue ,  Akira Arimoto ,  Hiroyuki Minemura ,  Hisao Fujita ,  Hideaki Koyanagi

发明人： Takeshi Shimano ,  Masayuki Inoue ,  Akira Arimoto ,  Hiroyuki Minemura ,  Hisao Fujita ,  Hideaki Koyanagi

IPC分类号： G02B13/00 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1381 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

摘要： The objective lens has a numerical aperture NA=0.6 when reproducing a DVD having a thickness of 0.6 mm and NA=0.42 when reproducing a CD having a thickness of 1.2 mm. At a boundary of NA 0.42, a slight stepped portion is formed so as to establish a phase difference. In this case, a designed wavelength is 0.635 .mu.m, and an optimum designed substrate thickness of a central portion is approximately 0.8 mm. While the DVD is reproduced, wave front aberration is on the order of 0.025.lambda., and jitter contained in the reproduction signal of the CD is equivalent to the present jitter. As a consequence, such an objective lens and an optical head with employment of this objective lens are provided, which precisely reproduce signals from the CD having the substrate thickness of 1.2 mm, and the DVD having the substrate thickness of 0.6 mm.

摘要翻译： 当再现厚度为1.2mm的CD时，物镜在再现厚度为0.6mm的DVD和NA = 0.42时具有数值孔径NA = 0.6。 在NA 0.42的边界处，形成一个微小的台阶部分以形成相位差。 在这种情况下，设计波长为0.635μm，中心部分的最佳设计基板厚度为约0.8mm。 当DVD被再现时，波前像差在0.025λ的数量级，并且包含在CD的再现信号中的抖动等于当前的抖动。 因此，提供这样的物镜和使用这种物镜的光学头，其精确地再现了具有1.2mm的衬底厚度的CD的信号，以及具有0.6mm的衬底厚度的DVD。

公开(公告)号：US4802721A

公开(公告)日：1989-02-07

申请号：US97297

申请日：1987-09-14

申请人： Hisao Fujita

发明人： Hisao Fujita

IPC分类号： G02B26/12 ,  G02B13/00 ,  G02B13/18 ,  G02B26/10 ,  G02B27/00

CPC分类号： G02B27/0031 ,  G02B13/18 ,  G02B26/10

摘要： In a scanning optical system for deflecting a laser beam by a deflector to converge it on a scanning surface by a focusing lens, it is difficult to compensate for both an image surface curvature and a distortion aberration in the optical system. An optical system according to the present invention is designed to minimize a curvature of a meridional image surface of a focusing lens, and a sagittal image surface and distortion are compensated for by arranging an aspherical surface between the focusing lens and the scanning surface. This aspherical surface is advantageously arranged by forming a cylindrical lens, which is inserted to compensate for a tilting of the deflected surface, into an aspherical surface.

摘要翻译： 在用于通过偏转器偏转激光束以通过聚焦透镜将其会聚在扫描表面上的扫描光学系统中，难以补偿光学系统中的图像表面曲率和畸变像差。 根据本发明的光学系统被设计成使聚焦透镜的子午图像表面的曲率最小化，并且通过在聚焦透镜和扫描表面之间布置非球面来补偿矢状图像表面和失真。 该非球面表面有利地通过形成插入以补偿偏转表面的倾斜而成为非球面的柱面透镜来布置。

公开(公告)号：US4926195A

公开(公告)日：1990-05-15

申请号：US193959

申请日：1988-05-13

申请人： Takashi Murahashi ,  Hisao Fujita ,  Toshihiko Nakazawa ,  Toshihiro Takesue ,  Toshihiro Motoi

发明人： Takashi Murahashi ,  Hisao Fujita ,  Toshihiko Nakazawa ,  Toshihiro Takesue ,  Toshihiro Motoi

IPC分类号： G02B27/00 ,  H04N1/113

CPC分类号： H04N1/1135 ,  G02B27/0031

摘要： A light beam recording system in which the beam is deflected after passage through a focusing element to scan a recording medium. An optical image surface correction system is employed between the deflector and recording medium for correction of the curvature of the field in the main scanning direction. The optical correction system includes an aspherical surface and deviation from a paraxial generating spherical surface to the aspherical surface.

公开(公告)号：US4276854A

公开(公告)日：1981-07-07

申请号：US93809

申请日：1979-11-13

申请人： Hisao Fujita ,  Yasuhiko Tanaka ,  Isao Kobayashi ,  Ken Nakamura

发明人： Hisao Fujita ,  Yasuhiko Tanaka ,  Isao Kobayashi ,  Ken Nakamura

IPC分类号： G01N27/60 ,  G01N27/72 ,  G01R33/00 ,  G03G15/08 ,  B05C11/00 ,  G03G15/09

CPC分类号： G03G15/0853

摘要： An apparatus for detecting the density (concentration) of toner in a developer for an electrostatic recording apparatus includes an operatively moveable surface for carrying developer onto an electrostatic latent image bearing member during image development, a scraper element having at least a flat surface for scraping developer from the movable surface in a substantially steady and uniform stream along the flat face, and a substantially flat detection coil assembly having oppositely-directed faces. The coil assembly is mounted on, spaced apart from, and substantially parallel to the flat face of the scraper so that the stream of developer passes along both coil assembly faces directly after being scraped from the moveable surface, thereby enhancing the toner density detection sensitivity of the coil assembly.

摘要翻译： 用于检测静电记录装置的显影剂中的调色剂的浓度（浓度）的装置包括：用于在图像显影期间将显影剂承载在静电潜像承载部件上的可操作地移动的表面，至少具有用于刮刮显影剂的平坦表面的刮刀元件 从可动表面沿着平坦的表面以基本稳定和均匀的流体，以及具有相对方向的面的基本平坦的检测线圈组件。 线圈组件安装在刮板的平坦表面上并基本上平行于刮板的平面，使得显影剂流在从可移动表面刮下之后直接沿着两个线圈组件表面通过，从而增强了调色剂浓度检测灵敏度 线圈组件。

公开(公告)号：US4767201A

公开(公告)日：1988-08-30

申请号：US741895

申请日：1985-06-06

申请人： Hisao Fujita ,  Tomoko Wakabayashi ,  Hiroyuki Yamazaki

发明人： Hisao Fujita ,  Tomoko Wakabayashi ,  Hiroyuki Yamazaki

IPC分类号： G02B13/04 ,  G02B13/18 ,  G02B9/34

CPC分类号： G02B13/18 ,  G02B13/04

摘要： For small type wide angle lenses for use with a compact camera, so-called inverted retrofocus lenses are often used. In this type of lens, the lens can be formed into more compact by increasing a refracting power of a rear unit of a negative meniscus with a convex surface thereof greatly curved toward an image and a front unit on the side of an object. However, this arrangement gives rise to an aberration. This aberration can be compensated by introducing at least one aspherical surface into the front unit and rear unit. In addition, this aspherical lens can be easily produced if it is formed of plastics.

摘要翻译： 对于与小型相机一起使用的小型广角镜头，通常使用所谓的倒置后焦距透镜。 在这种类型的透镜中，通过增加负弯月面的后部单元的折射能力，透镜可以形成为更紧凑，其凸面朝向图像大量弯曲，并且在对象侧面具有前单元。 然而，这种布置引起了像差。 可以通过将至少一个非球面表面引入前单元和后单元来补偿该像差。 此外，如果非球面透镜由塑料制成，则可以容易地制造。

公开(公告)号：US4688903A

公开(公告)日：1987-08-25

申请号：US746623

申请日：1985-06-19

申请人： Hisao Fujita ,  Hiroyuki Yamazaki ,  Tomoko Wakabayashi

发明人： Hisao Fujita ,  Hiroyuki Yamazaki ,  Tomoko Wakabayashi

IPC分类号： G02B9/34 ,  G02B13/04 ,  G02B13/18

CPC分类号： G02B13/18 ,  G02B13/04 ,  G02B9/34

摘要： This invention relates to a wide angle lens for a compact camera using a lens shutter, in which wide angle lens, a distance from a front surface of the lens to a film surface is short. The lens is a lens of the inverted retrofocus type in which a negative meniscus lens greatly curved toward an image is arranged at the rear of a triplet lens of convex, concave and convex. The second, third and fourth lenses each comprise a plastic lens. Various aberrations are compensated and variation in focal length due to a variation in temperature is also prevented. By the formation of plastic lenses, it is possible to easily form the fourth lens into an aspherical lens.

摘要翻译： 本发明涉及一种用于使用透镜快门的小型照相机的广角镜头，其中广角镜头从透镜的前表面到胶片表面的距离短。 透镜是倒置后焦点型的透镜，其中朝向图像大大弯曲的负弯月形透镜布置在凸，凹和凸的三重透镜的后部。 第二，第三和第四透镜各自包括塑料透镜。 各种像差被补偿，并且还防止了由于温度变化引起的焦距的变化。 通过形成塑料透镜，可以容易地将第四透镜形成为非球面透镜。

公开(公告)号：US4501475A

公开(公告)日：1985-02-26

申请号：US381311

申请日：1982-05-24

申请人： Hisao Fujita ,  Shozo Ishiyama

发明人： Hisao Fujita ,  Shozo Ishiyama

IPC分类号： G02B15/173 ,  G02B7/04

CPC分类号： G02B15/173

摘要： The present invention relates to a zoom lens system having a new structure for use with still cameras, which is wide magnification-variable and compact whose zoom ratio is about three times.A positive third lens group of a conventional zoom lens comprising three lens group, i.e. positive, negative and positive is divided into two positive lens groups to thereby decrease the refractive power of each lens group and an airspace therebetween being increased and decreased, whereby enhancing the effect of magnification-variation or rendering it possible to be utilized for correction of aberration.Further, a positive lens group having a weak refractive power is arranged between image planes to effect correction of aberration. As a result, there is obtained a zoom lens system having a new arrangement of refractive power in order of positive, negative, positive, positive and positive.

摘要翻译： 本发明涉及一种具有用于静态照相机的新结构的变焦透镜系统，该变焦透镜系统具有宽的放大倍数和紧凑度，其变焦倍数约为三倍。 包括三个透镜组（即正，负和正）的常规变焦透镜的正第三透镜组被分成两个正透镜组，从而降低每个透镜组的折射能力，并且其间的空间增大和减小，由此增强 放大变化的效果或使得可以用于校正像差。 此外，具有弱屈光力的正透镜组布置在像平面之间以实现像差校正。 结果，获得了具有正，负，正，正和正的顺序的折射力的新布置的变焦透镜系统。

公开(公告)号：US4273843A

公开(公告)日：1981-06-16

申请号：US45759

申请日：1979-06-05

申请人： Hisao Fujita ,  Kiyoshi Kimura

发明人： Hisao Fujita ,  Kiyoshi Kimura

IPC分类号： G03G15/08

CPC分类号： G03G15/0855

摘要： An apparatus and method for detecting the concentration of toner in a multi-component developer of an electrophotographic copying machine utilizes a source of illumination for projecting light onto the developer, and a receiving element for measuring the intensity of light of a predetermined wavelength reflected from the developer, the predetermined wavelength being of a value selected to maximize the intensity of reflected light in response to variations in toner concentration substantially independently of the reflection characteristics of the developer. The amount or concentration of toner in the developer is varied--by the addition of suitable amounts of toner--with the measured intensity of the received reflection of light of the predetermined wavelength.

摘要翻译： 用于检测电子照相复印机的多组分显影剂中的调色剂浓度的装置和方法利用将光投射到显影剂上的照明源，以及用于测量从所述显影剂反射的预定波长的光的强度的接收元件 显影剂，预定波长的值被选择为响应于基本上独立于显影剂的反射特性的调色剂浓度的变化来最大化反射光的强度。 显影剂中调色剂的量或浓度通过添加适量的调色剂而变化，其中测量的预定波长的光的接收反射强度。