Abstract: A projector rear is simple in structure uses reflection type liquid crystal plates to project images on a screen. R light emitted by a light source is directed to a first liquid crystal plate via a first dichroic mirror. Light reflected from the first liquid crystal plate is reflected toward a projection axis by the first dichroic mirror. B light transmitted through the first dichroic mirror is reflected by a second dichroic mirror and impinges on a second liquid crystal plate. Light reflected by this second liquid crystal plate is again reflected toward the projection axis by the second dichroic mirror. G light is made to directly enter a third liquid crystal plate. G light reflected by the third liquid crystal plate travels along the projection axis. The angular positional relations among optical elements are so set that the angle of incidence to the normal to each dichroic mirror is close to the angle of reflection.

Abstract: A flat-type cathode ray tube is disclosed which comprises a flat tube envelope (1) in which first and second electrodes (2) and (3) are provided to face each other in the thickness direction of the envelope for presenting a first deflection system to perform an electrostatic deflection, a phosphor screen (4) is formed on the side of the first electrode (2), and a second deflection system (6) is formed between the first deflection system and an electron gun (5) to perform an electromagnetic deflection. A third electrode (10) sufficiently surrounding the region of the second deflection system (6) is formed integral with the second electrode (3) and the second and third electrodes (3) and (10) are supplied with a voltage lower than that of the first electrode (2). This flat-type cathode ray tube can reduce a power consumption and suppress a circular-arc distortion.

Abstract: A cathode ray tube which comprises: an evacuated envelope having at least one transparent flat portion, a fluorescent target arranged on the inner surface of the flat portion, an electron gun within the envelope in laterally spaced relation to the target for emitting an electron beam along a path parallel with the surface of the flat portion, a first deflecting device comprising the target, and an opposite electrode in the envelope for impinging the electron beam upon the target, a second deflecting device comprising a pair of plates to control the electron beam passing therebetween and arranged in the envelope for deflecting the electron beam perpendicularly to the surface of the flat portion, the pair of plates being connected with the opposite electrode and the anode electrode of the electron gun, respectively, and a vertical deflection signal being applied to the anode electrode, and a third deflecting device arranged adjacent to the envelope in cooperation with the pair of plates for concentrating deflec

Abstract: A flat cathode ray tube is disclosed in which the deflection of an electron beam in the direction which requires a large deflection angle is carried out by the electromagnetic deflection, while the deflection of the electron beam in the direction which requires a small deflection angle is carried out by electrostatic deflection. Further, in the evacuated envelope of the flat cathode ray tube, there is located a high magnetic permeability body to concentrate the magnetic flux on the electron beam necessary for the electromagnetic deflection. In a certain case, a magnetic material body with the electrical conductivity is used as the high magnetic permeability body so as to provide it with the function of serving as an electrode plate for the electrostatic deflection of the electron beam.