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    • 61. 发明授权
    • Transverse double mode saw filter
    • 横向双模锯式过滤器
    • US06384698B1
    • 2002-05-07
    • US09719836
    • 2000-12-21
    • Satoru HayashiMichiaki TakagiTakashi Yamazaki
    • Satoru HayashiMichiaki TakagiTakashi Yamazaki
    • H03H964
    • H03H9/6479H03H9/0028H03H9/6463
    • A transversally coupled double-mode SAW filter using a surface acoustic wave has two SAW resonators which have curtain-like electrodes and a pair of reflectors on both side thereof, respectively, and which are disposed in parallel on a piezoelectric flat plate in the propagation direction of the surface acoustic wave. The curtain-like electrodes of the SAW resonators have a first bus bar of electrically positive electrode which extends in the propagation direction of SAW and second and third bus bars of electrically negative electrode which extend in parallel on both sides of the first bus bar. The first bus bar has multiple electrode fingers of electrically positive electrode which face the second and third bus bars on both sides thereof and which extend in a direction perpendicular to the propagation direction of SAW so as to suitably have a space of &lgr;/2, &lgr; being the wavelength of the surface acoustic wave, and a width of &lgr;/4. The second and third bus bars have multiple electrode fingers of electrically negative electrode which correspond to the electrode fingers of electrically positive electrode, face the first bus bar and extend in a direction perpendicular to the propagation direction of SAW so as to similarly have a space of &lgr;/2 and a width of &lgr;/4. Thereby, the curtain-like electrodes are constituted to invert the direction of driving field by 180° with the first bus bar therebetween, and to enable making the passband width sharply broader than before by use of the frequency difference between excited primary symmetric mode and primary anti-symmetric mode.
    • 使用声表面波的横向耦合的双模式SAW滤波器具有两个SAW谐振器,它们分别在其两侧具有帘状电极和一对反射器,并且在传播方向上并联设置在压电平板上 的表面声波。 SAW谐振器的帘状电极具有在SAW的传播方向上延伸的电正极的第一母线和在第一母线的两侧平行延伸的电负极的第二和第三母线。 第一母线具有电极正极的多个电极指,其两侧面对第二和第三母线,并且在与SAW的传播方向垂直的方向上延伸,以适当地具有lambd / 2,lambd的空间 是表面声波的波长,以及lambd / 4的宽度。 第二和第三母线具有电负极的多个电极指,其对应于电正极的电极指,面对第一母线并且在垂直于SAW的传播方向的方向上延伸,以类似地具有 lambd / 2和lambd / 4的宽度。 由此,帘式电极被构成为将驱动场的方向与其间的第一母线反转180°,并且通过使用被激励的主对称模式与初级对称模式之间的频率差,能够使通带宽度比以前更宽 反对称模式。
    • 67. 发明授权
    • Disk unit and process for assembling transmission mechanism used for
driving head carriage
    • 用于驱动头架的组合传动机构的磁盘单元和过程
    • US5777978A
    • 1998-07-07
    • US432173
    • 1995-06-26
    • Toshiro OtaMasakatsu HosoyaTakashi Yamazaki
    • Toshiro OtaMasakatsu HosoyaTakashi Yamazaki
    • G11B7/085G11B17/04G11B21/04G11B21/02
    • G11B17/056G11B21/046G11B7/08582G11B7/085
    • Coil springs 96 and 97 are incorporated in a driving-side transmission mechanism 61 so as to absorb backlashes between a rack 55 and a drive gear 59a. Since the respective backlashes between the drive gear 59a and the rack 55 are absorbed by way of the coil springs 96 and 97, merely phase matching at the sole driving-side transmission mechanism 61 is required as phase matching work of toothed portions of gears during assembly, thereby simplifying the assembling task and shortening assembly time. Additionally, since a coil spring is not included in the rack 55, the rack can be designed to be small-sized in its width direction, thereby minimizing the moment of a force about the meshed engagement point, acting on an optical head carriage 53, and reducing transfer loss in the head.
    • PCT No.PCT / JP94 / 01510 Sec。 371日期:1995年6月26日 102(e)日期1995年6月26日PCT 1994年9月12日PCT PCT。 公开号WO95 / 08172 日期1995年3月23日线弹簧96和97并入驱动侧传动机构61中,以吸收齿条55与驱动齿轮59a之间的间隙。 由于驱动齿轮59a和齿条55之间的相应的间隙被螺旋弹簧96和97吸收,因此仅需要在底部驱动侧传动机构61处的相位匹配作为在组装期间齿轮的齿形部分的相位匹配工作 从而简化组装任务,缩短装配时间。 此外,由于螺旋弹簧不包括在齿条55中,所以齿条可以被设计成在其宽度方向上的尺寸小,从而最小化作用在光学头滑架53上的啮合接合点周围的力的力矩, 并减少头部的转移损失。