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    • 1. 发明授权
    • Movable optical head integrally incorporated with objective lens and
hologram element
    • 整体结合物镜和全息元件的可移动光学头
    • US5648951A
    • 1997-07-15
    • US415764
    • 1995-04-03
    • Makoto KatoYoshiaki KommaShin-ichi KadowakiYoshikazu HoriSeiji NishinoTetsuo Saimi
    • Makoto KatoYoshiaki KommaShin-ichi KadowakiYoshikazu HoriSeiji NishinoTetsuo Saimi
    • G02B5/18G02B5/32G02B27/00G11B7/09G11B7/12G11B7/13G11B7/135G11B7/00
    • G11B7/131G02B27/0037G02B27/4238G02B27/4277G02B5/1819G02B5/1857G02B5/32G11B7/094G11B7/123G11B7/1353G11B7/0912
    • Disclosed is a compact optical pick-up head apparatus suitable for mass-production, which comprises a light radiation source, an element composed of photodetector split into a plurality of regions and integrated on the same base, an objective lens for focusing a beam from the above source on an optical disk, a blazed hologram integrated to the support member of the lens, a means for driving the support member to which the objective lens and blazed hologram are integrated in response to an output as servo signal output from the photodetector which receives a diffracted beam produced in such a manner that a return beam reflected or diffracted by the optical disk is incident on the objective lens integrated with the above hologram. The optical pickup apparatus according to the present invention employs a region-split-type phase hologram in which a pair of Flesnel zone plate-like patterns, by which a plurality of diffraction wavefronts having a different focus and the same diffraction order are produced outside an optical-axis, are non-superimposedly formed. The above hologram can be blazed with a pinpoint accuracy by lithography using a few mask patterns synthesized by a computer, and further a more preferably blazing can be realized by the combination of the ion beam etching and the lithography. Accordingly, not only noise caused by an unnecessary diffracted beam component but also the offset of a servo signal can be restrained and the size of the objective lens can be reduced by the integration of the entire optical system, which greatly contributes to the superminiaturization of an optical head.
    • 公开了一种适用于批量生产的紧凑型光学拾取头装置,其包括光辐射源,由分离成多个区域并集成在同一基底上的光电检测器构成的元件,用于将来自 在光盘上的源极上,与透镜的支撑构件集成的闪耀的全息图,用于驱动支撑构件的装置,物镜和闪耀的全息图响应于作为从接收到的光电检测器输出的伺服信号的输出而被集成到该支撑构件上 以使得由光盘反射或衍射的返回光束入射到与上述全息图集成的物镜上的方式产生的衍射光束。 根据本发明的光学拾取装置采用区域分割型相位全息图,其中一对Flesnel区域板状图案,其中具有不同焦点和相同衍射级的多个衍射波前在外部产生 光轴不叠加地形成。 通过使用由计算机合成的几个掩模图案通过光刻可以使上述全息图以精确的准确度闪耀,并且还可以通过离子束蚀刻和光刻的组合来实现更好的燃烧。 因此,不仅可以抑制由不必要的衍射光束分量引起的噪声,而且可以抑制伺服信号的偏移,并且可以通过整个光学系统的整合来减小物镜的尺寸,这极大地有助于使 光头。
    • 2. 发明授权
    • Optical pickup head
    • 光学拾音头
    • US5301182A
    • 1994-04-05
    • US868939
    • 1992-04-16
    • Yoshiaki KommaSeiji NishinoYoshikazu Hori
    • Yoshiaki KommaSeiji NishinoYoshikazu Hori
    • G11B7/09G11B7/135G11B7/00
    • G11B7/1362G11B7/1353
    • An optical pickup head for operating on an information recording medium includes a light source for emitting a light beam. A transparent base plate has opposite surfaces formed with a semitransparent film and a hologram respectively. The semitransparent film is exposed to the light beam emitted from the light source, and reflects a portion of the light beam emitted from the light source. The portion of the light beam which is reflected by the semitransparent film forms a forward light beam. A condenser optical system serves to focus the forward light beam on the information recording medium. The forward light beam is reflected at the information recording medium, and forms a backward light beam. The backward light beam successively passes through the condenser optical system, the semitransparent film, and the transparent base plate, and then reaches the hologram. The hologram generates a backward +1-order diffraction light beam from the backward light beam. A plurality of photodetectors serve to receive the +1-order diffraction light beam and to convert the received +1-order diffraction light beam into corresponding electric signals respectively.
    • 用于在信息记录介质上操作的光学拾取头包括用于发射光束的光源。 透明基板分别具有形成半透明膜和全息图的相对表面。 半透明膜暴露于从光源发射的光束,并且反射从光源发射的光束的一部分。 由半透明膜反射的光束部分形成正向光束。 聚光器光学系统用于将前向光束聚焦在信息记录介质上。 正向光束在信息记录介质上被反射,形成反向光束。 后向光束依次通过聚光系统,半透明膜和透明基板,然后到达全息图。 全息图从后向光束产生反向+ 1级的衍射光束。 多个光电探测器用于接收+ 1级衍射光束并将接收到的+1级衍射光束分别转换为相应的电信号。
    • 3. 发明授权
    • Optical pick-up device having holographic element
    • 具有全息元件的光学拾取装置
    • US5062098A
    • 1991-10-29
    • US259704
    • 1988-10-19
    • Yoshikazu HoriMakoto Kato
    • Yoshikazu HoriMakoto Kato
    • G11B7/135
    • G11B7/1353
    • An optical pick-up device includes a semiconductor laser for emitting a laser beam, a focusing lens for focusing the laser beam emitted from the laser onto the surface of an optical medium, a holographic optical element having an anisotropic refractive index and located between the laser and the focusing lens, and a photodetector for receiving a diffracted laser beam from the holographic optical element. The holographic optical element, which may be formed of a liquid crystal or a lithium niobate crystal, transmits therethrough in an undiffracted manner the laser beam emitted from the semiconductor laser and diffracts only the reflected laser beam which has reflected off of the optical medium.
    • 光学拾取装置包括用于发射激光束的半导体激光器,用于将从激光器发射的激光束聚焦到光学介质的表面上的聚焦透镜,具有各向异性折射率并位于激光器之间的全息光学元件 和聚焦透镜,以及用于接收来自全息光学元件的衍射激光束的光电检测器。 可以由液晶或铌酸锂晶体形成的全息光学元件以非衍射的方式从半导体激光器发射的激光束透射,并且仅衍射已经从光学介质反射的反射的激光束。
    • 9. 发明授权
    • Field-emission element having a cathode with a small radius
    • 具有半径小的阴极的场发射元件
    • US5502314A
    • 1996-03-26
    • US269676
    • 1994-07-01
    • Yoshikazu Hori
    • Yoshikazu Hori
    • H01J1/304H01J9/02H01L29/06H01J1/46H01L29/04H01L29/12
    • H01J1/3042H01J9/025
    • The invention is a field-emission element that is fabricated by forming an elevated surface and a base surface on a conductive substrate or a semiconductor substrate by applying a photolithographic process and an etching process, and making these surfaces cross at a step with an acute angle between the two surfaces. The intersection of the elevated surface with the step form a cathode having a radius of curvature of less than 20 nm. A gate electrode formed on the base electrode but insulated therefrom is disposed at a distance less than 1 .mu.m from said cathode by controlling the distance by the thickness of an etching protection mask. The field-emission element enables electrons to be emitted from the cathode when a voltage less than 150V is applied between the cathode and the gate electrode.
    • 本发明是通过应用光刻工艺和蚀刻工艺在导电衬底或半导体衬底上形成升高的表面和基底表面而制成的场致发射元件,并使这些表面以锐角 在两个表面之间。 升高的表面与台阶的交点形成具有小于20nm的曲率半径的阴极。 通过将距离除以蚀刻保护掩模的厚度,将形成在基极上但与之绝缘的栅电极设置在距离阴极小于1μm的距离处。 当在阴极和栅电极之间施加小于150V的电压时,场发射元件使得能够从阴极发射电子。