Abstract: At least an effective region of the face of a panel of a cathode ray tube is held within a vacuum chamber. After the vacuum chamber is hermetically sealed from the outside of the vacuum chamber, a thin film is formed on the face of the panel by using a film-forming means.

Abstract: The present invention provides a photocathode which is formed on a substrate consisting of polycrystalline members, and which mainly consists of a semimetal, manganese or silver, and one or a plurality of alkaline metals, characterized in that the photocathode is formed on an alkaline metal oxide layer formed on the substrate, and a composition ratio of the semimetal, manganese or silver, and the one or a plurality of alkaline metals is stoichiometric or almost stoichiometric. The photocathode of the present invention has high sensitivity and can stably maintain the sensitivity for a long period of time.

Abstract: In a display device, a picture element capacitor is connected to a light emitting element provided in each picture element. This picture element capacitor is connected to a signal source through a switching element. The picture element is charged, by the signal source, with a signal charge corresponding to an input signal, through the closure of the switching element during some period of time. The signal charge charged into the picture element capacitor is supplied to the light emitting element, whereby the element emits lights.

Abstract: An electron tube which comprises a metal vacuum envelope, a metal high energy ray input window fitted to the envelope, and photoelectric screen held in the envelope at a point close to the high energy ray input window, and which is characterized in that a semiconductor photosensor is set at that position within the vacuum envelope which lies near the peripheral edge of the photoelectric screen and to which a material constituting the photoelectric screen can be deposited, said photoelectric screen comprising a sealed container provided with a light input window and a semiconductor element received in the container.

Abstract: In an image intensifier comprising an evacuated envelope which comprises a cylindrical vessel, an input window member airtightly sealed to one end of the vessel, and an output container formed at the other end of the vessel, at least said one end portion of the cylindrical vessel is formed of metal, the input window member has a multilayer structure including an outer thin plate formed of metal weldable to the metal which constitutes at least said one end portion of the cylindrical vessel and an inner thin plate formed of aluminum or aluminum alloy which is thicker than the outer thin plate, the peripheral portion of the inner thin plate is pressure-bonded to an inner portion of a flange at the one end portion of the cylindrical vessel, and the peripheral portion of the outer thin plate extends beyond the peripheral portion of the inner thin plate and is fused with an outer portion of the flange.