U.S. Philips Corporation

Michele Fouassier

Hugues Baudry

Valere Dominique Duchenois

Michel Vittot

Low light level television system to detect the nocturnal light reflected from objects, comprising a main channel and acting on an extended range of wavelengths, provided with a low light level pick-up or detector tube, and a color channel, acting on a limited range of wavelengths, intended to bring forth the color for the formation of color images on a television monitor. The color channel includes an optical filter, which optical filter eliminates the infrared part of the reflected nocturnal light spectrum, a further low light level pick-up or detector tube, an electronic filter acting on the signal supplied by this further pick-up tube, the two tubes being placed side-by-side and being synchronized. The main and the color channels each act on a color channel of the monitor. The electronic filter provides a temporal integration over several fields. A processing circuit can combine the signals coming from the main and the color channels to act on a third color channel of the monitor.

Low light level color image television system including electronic

The invention relates to luminescent screen comprising an optical fibre plate formed by the reunion of elementary optical fibres constituted by bars of core glass (10) enveloped by a cladding glass (12), the optical fibre plate being provided with cavities obtained after having hollowed out partially the core glass. The bottom of the cavities is covered by a deposit of a restoring material (30) which is transparent to the luminous flux, improving the surface state and the flatness of the bottom of the cavities and tending to minimize the break (32) at the intersection between the bottom and the wall of each cavity. The restoring material preferably has an optical index near that of the core glass in order to ensure the optical continuity. Said screen of high resolution and high luminous efficiency is used in display tubes such as night-vision tubes, X-ray converter tubes, slid scanning tubes, cathode ray tubes used in oscilloscopy or in television.

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Yerres, France

Michele Fouassier