公开(公告)号：US4922309A

公开(公告)日：1990-05-01

申请号：US267884

申请日：1988-11-07

申请人： Mitsunao Sekiwa ,  Tomohiro Akada

发明人： Mitsunao Sekiwa ,  Tomohiro Akada

IPC分类号： G01J3/02 ,  G02B5/30 ,  G02B6/02 ,  G02B27/28

CPC分类号： G01J3/02 ,  G01J3/0218 ,  G01J3/0224

摘要： An optical waveguide having a detour is disposed at either or both of the light-receiving and light-emitting ends of a dispersion optical system in a spectroscope. Even though light being propagated through the optical waveguide has specified polarizing characteristics, the light is depolarized by passing through the optical waveguide and many times reflecting therein. Accordingly, unpolarized light not affected by the polarization selectivity of the dispersion optical system or the like can be emitted from the spectroscope.

公开(公告)号：US06628389B1

公开(公告)日：2003-09-30

申请号：US09831420

申请日：2001-05-09

申请人： Tomohiro Akada ,  Kenji Murano ,  Koichi Kuraue

发明人： Tomohiro Akada ,  Kenji Murano ,  Koichi Kuraue

IPC分类号： G01J400

CPC分类号： G02F1/1309 ,  G01B11/06 ,  G01B11/14 ,  G02F2001/133742

摘要： Light is directed to a VA (Vertical Alignment) liquid crystal panel whose optical axis is in a direction perpendicular to the panel surface in such a manner that the light is incident obliquely on the VA liquid crystal panel surface, by which birefringence that results only from the liquid crystal layer is artificially generated so that measurement of the thickness (cell gap) of the VA liquid crystal is accurately performed.

摘要翻译： 光被引导到光轴垂直于面板表面的方向的VA（垂直取向）液晶面板，使得光倾斜地入射到VA液晶面板表面上，由此双折射仅由 人造地生成液晶层，从而精确地测量VA液晶的厚度（单元间隙）。

公开(公告)号：US07230713B2

公开(公告)日：2007-06-12

申请号：US10470015

申请日：2001-02-09

申请人： Tomohiro Akada ,  Masaya Takizawa

发明人： Tomohiro Akada ,  Masaya Takizawa

IPC分类号： G01N21/55 ,  G01B11/28 ,  G01B11/06

CPC分类号： G02F1/1309 ,  G01B11/065 ,  G01B11/14

摘要： The polarization angle θ1 of a polarizer (14) is set, and the reflection intensity S1 in a cross Nicol state and the reference reflection intensity Ref1 of a liquid crystal cell (15) are measured. A different polarization angle θ2 is then set, and the reflection intensity S2 in a cross Nicol state and the reference reflection intensity Ref2 of the liquid crystal cell are measured. The rations S1/Ref1, S2/Ref2 of measured intensities and the ratio S1·Ref2/S2·Ref1 is determined in order to cancel the background components of the reference reflection intensities Ref1, Ref2 thus determining the value of cell gap accurately.

摘要翻译： 偏振器（14）的偏振角θ1被设定，并且测量交叉尼科尔状态下的反射强度S 1和液晶单元（15）的基准反射强度Ref 1。 然后设置不同的偏振角θ2，并且测量交叉尼科尔状态下的反射强度S 2和液晶单元的参考反射强度Ref 2。 因此，为了消除参考反射强度Ref 1，Ref 2的背景分量，确定测量强度的比例S 1 / Ref 1，S 2 / Ref 2和比值S 1 .Ref 2 / S 2 .Ref 1 准确地确定细胞间隙的值。