Rubbing apparatus, apparatus for producing liquid crystal device

Details Rubbing apparatus, apparatus for producing liquid crystal device Rubbing apparatus, apparatus for producing liquid crystal device

1993-12-21

1995-04-11

Ramsey, Kenneth J.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

G02F 11337

Patent

active

054063973

ABSTRACT:
A rubbing apparatus for imparting an alignment control power with respect to alignment of liquid crystal molecules to an alignment film on a transparent substrate of a liquid crystal device by rubbing the alignment film with a rubbing roller while the rubbing roller is rotated and kept in contact with the transparent substrate having thereon the alignment film, comprising: measuring means for measuring a three-dimensional stress imposed on the transparent substrate by the rubbing roller when the rubbing roller is brought into contact with the transparent substrate, and control means for controlling the three-dimensional stress so as to provide a prescribed stress to effect a rubbing treatment. The measuring means may perform the measurement by breaking up a stress into two stress components in directions perpendicular and parallel to the rubbing direction, respectively. The measurement of a stress may be performed by measuring a load imposed on the transparent substrate. The rubbing apparatus may further comprise judging means for judging a fluctuation in stress and correction means for correcting the fluctuation.

REFERENCES:
patent: 5315421 (1994-05-01), Kurai et al.

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