Optical system for a colour picture display

Assignee: Victor Company of Japan Ltd

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Filing: 1991-04-04

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Granted: —

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Expires: 2011-04-04

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Abstract

Abstract There is disclosed an optical system for a color picture display having three spatial light modulators of reflecting type corresponding to an optical image of one of three primary colors by photoelectric effect and photomodulation effect, a writing device for guiding writing lights each carrying the optical image of one of the colors to each device, a reading device for guiding reading lights each in the region of wavelength of one of the colors to each device and a composing device for composing a composed reading light of the reading lights which are emitted from the optical devices respectively after optically modulated. The optical system comprises an optical apparatus (SCA) shared by the reading device and the composing device, having first, second and third prisms (1, 2 and 3), a first dichroic filter (4) provided between the first and the second prisms (1 and 2) and a second dichroic filter (5) provided between the second and the third prisms (2 and 3).

Inventors

👤 Itsuo Takanashi
👤 Shintaro Nakagaki
👤 Ichiro Negishi
👤 Tetsuji Suzuki
👤 Fujiko Tatsumi
👤 Ryusaku Takahashi
👤 Keiichi Maeno

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 14:15

CPC Classifications

G; G02; G02B; G02B27/00; G02B27/10; G02B27/14; G02B27/149; G02B27/1006; G02B27/102; G02B27/1026; G02B27/145; H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/312

Claims Analysis

Total Claims: 2

Claim 1

Independent Claim 164 words

An optical system for a color picture display having three optical devices for respectively being written with an optical image of one of three primary colors as the image of an electric field by photoelectric effect and reproducing the optical image by photomodulation, writing means for guiding writing lights each carrying the optical image of one of the colors to each device, reading means for guiding reading lights each in the region of wavelength of one of the colors to each device and composing means for composing a composed reading light of the reading lights which are emitted from the devices respectively after optically modulated, characterized by comprising: optical means (SCA) shared by the reading means and the composing means, having first, second and third prisms (1, 2 and 3), a first dichoric filter (4) provided between the first and the second prisms ( 1 and 2) and a second dichroic filter (5) provided between the second and the third prisms (2 and 3).

Claim 2

Dependent Claim 268 words

An optical system for a color picture display having three optical devices each including composite polymer-liquid crystal and for respectively being written with an optical image of one of three primary colors as the image of an electric field by photoelectric effect and reproducing the optical image by photomodulation of the crystal, writing means for guiding writing lights each carrying the optical image of one of the colors to each device, a light source for emitting a light having lineary polarized lights, reading means for decomposing the light to three reading lights each in the region of wavelength of one of the colors and guiding respectively the reading lights to each device and composing means for composing a composed reading light of the reading lights which are emitted from the devices respectively after optically modulated by the crystal, characterized by comprising: beam splitting means (PBS) for reflecting a linearly polarized light of a specified plane of polarization among the linearly polarized lights toward the reading means; optical means (SCA) shared by the reading means and the composing means, having first, second and third prisms (1, 2 and 3), a first dichoric filter (4) provided between the first and the second prisms (1 and 2) and a second dichroic filter (5) provided between the second and the third prisms (2 and 3); and beam separation means (WP) provided between the optical means (SCA) and the beam splitting means (PBS) for rotating each of planes of polarization of the linearly polarized light of the specified plane of polarization and the composed reading light at specified angles different from each other.

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