Photocopying – Projection printing and copying cameras – Illumination systems or details
Reexamination Certificate
2005-02-15
2005-02-15
Kim, Peter B. (Department: 2851)
Photocopying
Projection printing and copying cameras
Illumination systems or details
C359S490020, C359S506000
Reexamination Certificate
active
06856379
ABSTRACT:
A polarizer suitable for transforming incident linearly polarized or circularly polarized light into exiting radially or tangentially polarized light with virtually no transmission losses has, in one of its embodiments, a plate fabricated from birefringent material on whose entrance and exit faces small zones (11, 12) with deflecting structures (8, 9) in the form of gratings or Fresnel surfaces have been created. The crystal axis (5) of said birefringent material is aligned parallel to the incident light beam. Said deflecting structures deflect light along a transmission direction (13) that is inclined with respect to said crystal axis (5), causing a phase shift between the field components of the transmitted light. Suitable choices of the angle of inclination (NW) of said transmission direction with respect to said crystal axis and the thickness (D) of said plate will allow transforming incident linearly polarized or circularly polarized light into an exiting light beam with an axisymmetric (tangential or radial) polarization distribution.
REFERENCES:
patent: 3146294 (1964-08-01), Koester et al.
patent: 4755027 (1988-07-01), Schafer
patent: 5001716 (1991-03-01), Johnson et al.
patent: 5365371 (1994-11-01), Kamon
patent: 5436761 (1995-07-01), Kamon
patent: 5638200 (1997-06-01), Xu
patent: 5673103 (1997-09-01), Inoue et al.
patent: 5677755 (1997-10-01), Oshida et al.
patent: 5691802 (1997-11-01), Takahashi
patent: 5847872 (1998-12-01), Ito
patent: 6072629 (2000-06-01), Fan et al.
patent: 6191880 (2001-02-01), Schuster
patent: 6252712 (2001-06-01), Furter et al.
patent: 30 35 025 (1981-04-01), None
patent: 195 35 392 (1997-03-01), None
patent: 198 07 120 (1999-08-01), None
patent: 0 764 858 (1997-03-01), None
patent: 2 088 078 (1982-06-01), None
patent: 05181088 (1993-07-01), None
patent: WO 9852077 (1998-01-01), None
M. Born et al, “Principles of Optics”, Pergamon Press, p. 694, 1980.
Carl Zeiss SMT AG
Kim Peter B.
LandOfFree
Polarizer and microlithography projection system with a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polarizer and microlithography projection system with a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polarizer and microlithography projection system with a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3481690