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    • 6. 发明授权
    • Collimating lens for use in optical memories
    • 用于光学存储器的准直透镜
    • US4904062A
    • 1990-02-27
    • US321484
    • 1989-03-08
    • Ichiro MorishitaHiroko Hanzawa
    • Ichiro MorishitaHiroko Hanzawa
    • G02B13/00G02B3/00G02B13/18G02B13/24G11B7/125G11B7/135
    • G11B7/1372G02B13/24G02B3/00
    • An improved collimating lens for use in optical memories is disclosed which comprises a first surface for receiving the incident beam which is concave, and a second surface for emitting the outgoing beam which is convex and non-spherical, characterized in that the said lens satisifies some particular conditions. If the collimating lens of the present invention is used, the beam passing through the periphery of the lens can be concentrated, and therefore, the actual number of openings of the objective lens is increased, and at the same time, the coupling efficiency can be improved. Accordingly it is possible to form very tiny spot on the disc, and the transmission rate can also be improved. Further, the appearance of the lens can be favorably shaped when manufacturing the lens, because the lens of the present invention is strong against the difference of the axes.
    • 公开了一种用于光学存储器的改进的准直透镜,其包括用于接收凹入的入射光束的第一表面和用于发射凸出和非球形的输出光束的第二表面,其特征在于,所述透镜满足一些 特殊条件。 如果使用本发明的准直透镜,则可以集中透过透镜周边的光束,因此物镜的实际开口数量增加,同时耦合效率可以 改进。 因此,可以在盘上形成非常微小的斑点,并且还可以提高透射率。 此外,由于本发明的透镜相对于轴的差异强,所以在制造透镜时能够使透镜的外观成形。
    • 8. 发明授权
    • Objective lens for optical memory device
    • 物镜用于光学存储器件
    • US4925283A
    • 1990-05-15
    • US388797
    • 1989-08-02
    • Ichiro MorishitaHiroko Hanzawa
    • Ichiro MorishitaHiroko Hanzawa
    • G02B9/00G02B13/18G02B13/24G11B7/135
    • G02B13/24
    • An objective lens for an optical memory device comprising a plane surface on one side thereof for emitting a luminous flux oppositely to a disk, and an aspherical surface on the other of the side thereof for receiving a luminous flux reversely to the disk in such a manner that the following conditions (1) and (2) are satisfied:1.69.ltoreq.n.ltoreq.1.74 (1)n-1.gtoreq.(n.sub.C -n.sub.A')/0.00056 (2)where n is a refractive index of a lens medium for the wavelength of an incident light, n.sub.A' is a refractive index of a lens medium for A' beam (768.2 nm of wavelength) of a reference light beam, and n.sub.C is a refractive index of a lens medium for a C beam (656.3 nm of wavelength). Thus, the lens can sufficiently obtain the thickness of the periphery thereof, has a plenty of utility in light weight, and can follow a variation in a laser wavelength due to the switching of the emitting light power of a semiconductor laser.
    • 一种用于光学存储器件的物镜,包括一侧的平面,用于发射与盘相反的光通量,另一侧的非球面用于以这种方式接收与光盘反向的光通量 满足以下条件(1)和(2):1.69 / =(nC-nA')/ 0.00056(2)其中n是 用于入射光波长的透镜介质,nA'是参考光束的A'光束(768.2nm波长)的透镜介质的折射率,n C是用于C的透镜介质的折射率 光束(波长为656.3nm)。 因此,透镜可以充分获得其周边的厚度,具有很大的实用性,重量轻,并且可以跟随由于半导体激光器的发光功率的切换而导致的激光波长的变化。