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    • 117. 发明授权
    • Optical head with reduced aberration
    • 具有减小像差的光头
    • US5270997A
    • 1993-12-14
    • US641261
    • 1991-01-15
    • Hiroshi Katayama
    • Hiroshi Katayama
    • G11B7/09G11B7/12G11B7/125G11B7/135G11B7/00
    • G11B7/12G11B7/0909G11B7/1365G11B7/13922
    • An optical head device for recording and/or reproducing information by using an optical recording medium includes a light source, an objective lens, a photo detector, an optical system including a collimator lens, a beam splitter, a convergent lens and a cylindrical lens, a housing for accommodating the light source, the photo detector and the optical system, and an optical glass plate for reducing aberration of the optical system and the objective lens. A light beam from the light source is turned to a parallel beam flux by the collimator lens to irradiate the objective lens, which provided drivably converges the parallel beam flux on the optical recording medium. The light beam reflected from the optical recording medium passes through the objective lens and reflected by the beam splitter in the optical system toward the photo detector. The light beam reflected by the beam splitter is converged on the photo detector by the convergent lens and the cylindrical lens. The characteristic of the present invention is that the optical glass plate for reducing the aberration seals the housing to protect the light source and the optical system from dust. The optical glass plate is set rotated about the axis of the parallel beam flux to a position reducing the aberration of the optical system and of the objective lens.
    • 118. 发明授权
    • Optical type position detecting device
    • 光学类型位置检测装置
    • US5194919A
    • 1993-03-16
    • US749663
    • 1991-08-26
    • Hiroshi Katayama
    • Hiroshi Katayama
    • G01B11/00G11B7/09G11B7/135
    • G11B7/1381
    • An optical type position detecting device comprising a light source, and a light-receiving element for detecting a light beam emitted by the light source, a region on the light-receiving element whereon the light beam is incident having parallel boundaries, the boundaries extending in directions substantially corresponding to directions of relative displacement of the region and the light-receiving element, the relative displacement accompanying a displacement of a body. The relative displacement can be detected by detecting a change in area of the region using the light-receiving element. A magnitude of displacement of the body is proportional to a change in output of the light-receiving element since, irrespective of where the displacement of the body begins from, a contstant width of the region is maintained along a direction perpendicular with respect to the direction of the relative displacement. In other words, the displacement of the body can be accurately detected since linearity is achieved between the two.