Polarizer and light valve image projector having the polarizer

Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers

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359487, 359496, 359497, 359500, G02B 530, G02B 2728

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active

053573706

ABSTRACT:
A polarizer comprising; a substrate transparent to a light of actual use and optical thin films of a higher refractive index than that of said substrate deposited on both surfaces of said substrate. The substrate is arranged so as to receive the incident light obliquely thereto. When the incident angle and the thickness of the optical thin film are optimally selected, the transmittance for the P polarized light can be made approximately 100%, while that for the S polarized light very small. The polarizer can extract a substantially linearly polarized light from natural light. A projection image display system has the polarizer as its pre-polarizer. The polarizer is also useful for infrared radiation.

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Patent Abstracts of Japan, vol. 14, No. 94 (P-1010) 21 Feb. 1990 & JP-A-13 02 385 Published Jun. 12, 1989, English Abstract.
Patent Abstracts of Japan, vol. 10, No. 268 (E-436) 12 Sep. 1986 & JP-A-61 090 584 Published Aug. 05, 1986, English Abstract.

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