公开(公告)号：US5042924A

公开(公告)日：1991-08-27

申请号：US490221

申请日：1990-03-08

申请人： Shuji Terasaki ,  Mitsuru Ohta ,  Akiyasu Ishii ,  Yuji Kojima ,  Akira Tanaka

发明人： Shuji Terasaki ,  Mitsuru Ohta ,  Akiyasu Ishii ,  Yuji Kojima ,  Akira Tanaka

IPC分类号： C08J5/18 ,  C08L27/16 ,  C08L33/12

CPC分类号： C08J5/18 ,  C08L27/16 ,  C08J2327/16 ,  C08L33/12

摘要： An optical phase plate is provided in the form of a drawn and oriented film or sheet, having a composition comprising a vinylidene fluoride resin and a methyl methacrylate resin in a mixing ratio of the former to the latter between about 65/35 and about 85/15 by weight, in which the crystal structure of the vinylidene fluoride resin consists mainly of a .beta.-form and the film or the sheet has dimensional stability and a retardation value R within a range from 500 to 650 nm. The optical phase plate is produced by uniformly kneading and melt-extruding the predetermined PVDF/PMMA mixture into a sheet and subjecting the sheet to drawing and then to heat treatment.

公开(公告)号：US4583019A

公开(公告)日：1986-04-15

申请号：US613187

申请日：1984-05-23

申请人： Sumio Yamada ,  Yoshiro Fujiwara ,  Noboru Wakatsuki ,  Yuji Kojima

发明人： Sumio Yamada ,  Yoshiro Fujiwara ,  Noboru Wakatsuki ,  Yuji Kojima

IPC分类号： H03H9/05 ,  H03H9/10 ,  H03H9/17 ,  H01L41/08

CPC分类号： H03H9/177 ,  H03H9/02031 ,  H03H9/0547 ,  H03H9/1014

摘要： A piezoelectric resonator with a rectangular parallelepiped resonator. A lithium niobate single crystal is used as the resonator chip material. Each of the opposed main surfaces of the resonator chip is arranged to be a surface of a rotated Y-cut plate which is rotated 165.+-.5 degrees about an X-axis. The angle of the longitudinal direction of the resonator chip is arranged to be 90.+-.5 degrees with respect to the X-axis of the rotated Y-cut plate.

摘要翻译： 一种具有矩形平行六面体谐振器的压电谐振器。 使用铌酸锂单晶作为谐振器芯片材料。 谐振器芯片的相对的主表面中的每一个被布置为旋转的Y切割板的表面，其相对于X轴旋转165 +/- 5度。 谐振器芯片的纵向方向的角度相对于旋转的Y切割板的X轴设置为90 +/- 5度。