Optical system including liquid crystal devices

Details Optical system including liquid crystal devices Optical system including liquid crystal devices

1989-09-27

1992-03-17

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, 359 86, 359 93, 359209, G02F 11335, G02F 1133, G02F 1137, G02B 2608

Patent

active

050973525

ABSTRACT:
An objective optical system is provided with at least one liquid crystal lens whose polarizing characteristic selected in a direction such that polarizing components of light reflected from the lens are counterbalanced and a variable liquid crystal stop is arranged at an angle with respect to an optical axis so that an incident direction of light is deviated to the side on which contrast between transmission and blocked states of light is maximized. The objective optical system enables the balance of the polarizing components to bring about a proper image for observation, can moderate asymmetry, relative to the optical axis, of the contract between the transmission and blocked states of light of the liquid crystal stop, and can secure an adjustable object image.

REFERENCES:
patent: 4037929 (1977-07-01), Bricot et al.
patent: 4190330 (1980-02-01), Berreman
patent: 4721363 (1988-01-01), Inoue
patent: 4762399 (1988-08-01), Wu
patent: 4768864 (1988-09-01), Wu et al.
patent: 4904063 (1990-02-01), Okada et al.
patent: 4927240 (1990-05-01), Stolov et al.
patent: 4928172 (1990-05-01), Uehara et al.

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