PHASE DIFFERENCE PLATE AND CIRCULAR POLARIZING PLATE

Title:

PHASE DIFFERENCE PLATE AND CIRCULAR POLARIZING PLATE

Document Type and Number:

Japanese Patent JPH0527118

Kind Code:

A

Abstract:

PURPOSE:To obtain the phase difference plate which is less changed in the phase difference by wavelengths and has the excellent uniformity of the phase difference in a wide band and the circular polarizing plate excellent in prevention of reflection, etc., in the wide band. CONSTITUTION:This phase difference plate 5 is constituted by laminating a double refractive film 1 having 1.00 to 1.05 retardation to light of 450nm wavelength/retardation to light of 550nm wavelength and the large retardation and a double refractive film 3 having 1.05 to 1.20 ratio mentioned above and the small retardation in the state of intersecting the optical axes thereof. This circular polarizing plate consists of the laminate of the above-mentioned phase difference 5 having 1/4 wavelength in the phase difference of the double refracted light and a polarizing plate 4.

Inventors:

YOSHIMI HIROYUKI
NAGATSUKA TATSUKI
FUJIMURA YASUO

Application Number:

JP20378691A

Publication Date:

February 05, 1993

Filing Date:

July 17, 1991

Export Citation:

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Assignee:

NITTO DENKO CORP

International Classes:

G02B5/30; G02B26/06; (IPC1-7): G02B5/30; G02B26/06

Attorney, Agent or Firm:

Tsutomu Fujimoto

Next Patent: JPH0527119