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    • 5. 发明授权
    • Optical recording medium having a track pitch less than the wavelength
of a laser beam
    • 轨道间距小于激光束波长的光记录介质
    • US6014360A
    • 2000-01-11
    • US952017
    • 1997-11-14
    • Masatoshi YonekuboToshio ArimuraTakao Miyazawa
    • Masatoshi YonekuboToshio ArimuraTakao Miyazawa
    • G11B7/00G11B7/005G11B7/12G11B7/13G11B7/135G11B20/10G11B7/09
    • B82Y10/00G11B7/123G11B7/131G11B7/133G11B7/1353G11B7/1367G11B7/1381G11B20/10009G11B2007/0006G11B2007/13727G11B7/005
    • By using a semiconductor laser of a relatively long wavelength relative to the track pitch of an optical recording medium, and the optical super-resolution technique, there are provided an optical head and an optical recording apparatus which permit processing such as recording and regeneration onto and from a conventional CD-R with no problems, and processing of an optical recording medium of the DVD standard with a high recording density. In the optical head and the optical recording apparatus of the present invention, a semiconductor laser having a relatively long wavelength relative to the track pitch of an optical recording medium can be used. The invention therefore provides an optical head and an optical recording apparatus which overcome the limit on efforts toward a higher density, and permit recording and regeneration at a high recording density at a low cost with a high reliability. The invention provides also an optical head and an optical recording apparatus capable of coping with the tendency toward a higher density in the future.
    • PCT No.PCT / JP97 / 00738 Sec。 371日期:1997年11月14日 102(e)日期1997年11月14日PCT 1997年3月10日PCT公布。 公开号WO97 / 35306 日期:1997年9月25日通过使用相对于光记录介质的轨道间距的相对较长波长的半导体激光器和光学超分辨率技术,提供了一种光学头和光学记录装置,其允许诸如 在常规CD-R上进行记录和再现,没有任何问题,以及具有高记录密度的DVD标准的光学记录介质的处理。 在本发明的光头和光记录装置中,可以使用相对于光记录介质的轨道间距具有较长波长的半导体激光器。 因此,本发明提供一种光学头和光学记录装置,其克服了朝向更高密度的努力的限制,并且以高可靠性以低成本允许以高记录密度进行记录和再生。 本发明还提供能够应对将来朝向更高密度的趋势的光学头和光学记录装置。
    • 9. 发明授权
    • Optical pick-up and optical recording system
    • 光学拾取和光学记录系统
    • US5986996A
    • 1999-11-16
    • US952012
    • 1997-11-26
    • Shojiro KitamuraKatsumi MoriTakayuki KondoTakeo KanekoToshio Arimura
    • Shojiro KitamuraKatsumi MoriTakayuki KondoTakeo KanekoToshio Arimura
    • G11B7/00G11B7/0037G11B7/12G11B7/125G11B7/135
    • G11B7/1353G11B7/0037G11B7/123G11B7/127G11B7/1381G11B7/139G11B2007/0006
    • An optical pick-up according to the present invention is designed such that laser beams having different polarization directions or different radiation angles are irradiated from laser beam sources formed in a surface emitting laser array to change the effective numerical aperture of an optical element having an objective lens, or the like. An optical pick-up having high capability with an optical disk having a low recording density and a thick substrate according to the CD standard, and an optical disk having a high recording density and a thin substrate according to the DVD standard, can be realized. A plurality of laser beam sources can be formed in a small space by employing a surface emitting laser array, and the numerical aperture of the optical system can be controlled by selecting a laser beam. For this reason, an optical pick-up having compatibility can be realized with an extremely simple arrangement, and a compact and high-performance optical pick-up can be provided at low cost.
    • PCT No.PCT / JP97 / 00744 Sec。 371日期:1997年11月26日 102(e)1997年11月26日PCT PCT 1997年3月10日PCT公布。 公开号WO97 / 34297 PCT 日本1997年9月18日根据本发明的光学拾取器被设计成使得具有不同偏振方向或不同辐射角的激光束从形成在表面发射激光器阵列中的激光束源照射以改变有效数值孔径 具有物镜的光学元件等。 可以实现具有根据CD标准的具有低记录密度的光盘和厚基板以及根据DVD标准具有高记录密度和薄基板的光盘的高性能的光学拾取器。 可以通过使用表面发射激光器阵列在小空间中形成多个激光束源,并且可以通过选择激光束来控制光学系统的数值孔径。 为此,可以以非常简单的结构实现具有兼容性的光学拾取器,并且可以以低成本提供紧凑且高性能的光学拾取器。
    • 10. 发明授权
    • Optical head
    • 光头
    • US5600619A
    • 1997-02-04
    • US428132
    • 1995-04-28
    • Taro TakekoshiTomohiro MakigakiHirokazu ItoToshio Arimura
    • Taro TakekoshiTomohiro MakigakiHirokazu ItoToshio Arimura
    • G11B7/09G11B7/12G11B7/125G11B7/135G11B11/105G11B7/00
    • G11B7/1353G11B7/0935G11B7/123G11B7/125G11B7/1362G11B11/10541G11B7/0932G11B7/0933
    • An integrally-driven type optical head (1) in which a laser optical system (20) provided with a semiconductor laser (22) and a light receiving device is mounted in a moving part of an actuator (50). In this optical head, the moving part (5) is constituted by uniting a heat radiator (10) made of a metal or the like with a heat insulator (9) made of a plastic or the like. The heat conduction bonding of the heat radiator to the semiconductor laser is performed. A coil of the actuator is securely fixed to this heat radiator through the heat insulator. Thereby, heat generated from the semiconductor laser is transferred to the heat radiator and is then radiated from the surface of the heat radiator to the external space of the optical head. Further, in case where heat is generated by the coil when the actuator operates, the laser optical system can be prevented from being heated, because of the fact that the heat conductivity between the coil and the laser optical system is low. Moreover, an increase in weight of the head, which is a hindrance to an operation thereof, can be prevented. Simultaneously with this, the rigidity of a holder can be increased. Thus an occurrence of harmful resonance can be prevented during the actuator is driven. Therefore, the heat radiation/cooling characteristics of the semiconductor laser can be considerably improved. Consequently, a stable operation of the apparatus and the reliability thereof can be achieved.
    • PCT No.PCT / JP94 / 01579 Sec。 371日期:1995年4月28日 102(e)日期1995年4月28日PCT 1994年9月26日PCT公布。 第WO95 / 09418号公报 日期1995年04月6日在驱动器(50)的移动部分安装有设置有半导体激光器(22)的激光光学系统(20)和光接收装置的整体驱动型光学头(1)。 在该光学头中,移动部件(5)通过将由金属等制成的散热器(10)与由塑料等制成的绝热体(9)结合而构成。 进行散热器与半导体激光器的导热接合。 致动器的线圈通过隔热件牢固地固定在该散热器上。 由此,从半导体激光器产生的热量传递到散热器,然后从散热器的表面辐射到光学头的外部空间。 此外,在致动器工作时由线圈产生热量的情况下,由于线圈和激光光学系统之间的导热率低,可以防止激光光学系统被加热。 此外,可以防止头部的重量的增加,这是其操作的障碍。 同时,可以提高保持器的刚性。 因此,在致动器被驱动时可以防止有害共振的发生。 因此,可以显着提高半导体激光器的散热/冷却特性。 因此,可以实现设备的稳定操作及其可靠性。