Optics: measuring and testing – By polarized light examination
Reexamination Certificate
2007-02-21
2009-06-23
Lauchman, L. G (Department: 2877)
Optics: measuring and testing
By polarized light examination
C356S319000, C356S322000, C349S005000, C349S008000, C359S483010, C359S486010
Reexamination Certificate
active
07551280
ABSTRACT:
A method for manufacturing an optical element in which a display quality of a projection image is improved is provided. The method is for manufacturing an optical element having a polarization plate of which one side a transmissive member is bonded. The method includes preparing a light source, a polarization plate, a transmissive member, a certificating polarization plate and a spectrophotometer; arranging the polarization plate, the transmissive member, and the certificating polarization plate between the light source and the spectrophotometer; measuring a light transmittance spectrum of a predetermined wavelength at each rotational position of the transmissive member; determining the rotational position of the transmissive member that yields a smallest value for a difference between a maximum value and a minim value of the light transmittance spectrum; and bonding the transmissive member to the polarization plate at the determined rotational position.
REFERENCES:
patent: 6885465 (2005-04-01), Kitabayashi et al.
patent: A 7-020317 (1995-01-01), None
patent: A 2000-112022 (2000-04-01), None
Hashizume Toshiaki
Yanai Hiroaki
Lauchman L. G
Oliff & Berridg,e PLC
Seiko Epson Corporation
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