U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Ronald Van Der Wilk

Josephus J Van Moorsel

Edwin A Montie

Theodorus H Stevens

Gerardus A Vrijssen

Willem M Van Alphen

Jacobus H Jamar

Maria C Van Uden

Jeroen Van Engelshoven

Bernardus H Dekkers

Johannes J Overbeek

Michiel Harjon Wassink

Werner D Kauwenberg

Alfred Ketting

Dani&euml;l Den Engelsen

Ronald J De Man

Henricus J Meijer

Mario L Thomas

Mark N Jonkhof

Lambertus J Van Rijsewijk

Antonius H J Willems

A cathode ray tube comprises a color selection electrode with a shadow mask fixed to a frame and put under tension. The frame comprises a bimetal element (or bimetal elements) which are constructed such that at a raised temperature the tension is released by reducing the distance between sides of the frame to which the mask is attached. The reduction in distance at the center of the sides exceeds, preferably by a factor 1.5 to 3, the reduction in distance at the corners of said sides.

Color selection electrode implementing a temperature based tension reduction of a shadow mask

A cathode ray tube comprising an electron gun. The electron gun has electrodes which are secured to supports by connecting elements. The width of the connecting elements varies. As a result, the high-voltage behavior of the cathode ray tube is improved.

CRT electron gun with reduced stray electron flow between electrodes

A cathode ray tube comprising a color selection electrode supported in tension. The electrode includes a circumferential portion on which vibration damping means are located for damping vibrations in the color selection electrode. The vibration damping means include a resonator in the form of at least one metal tongue, which is capable of vibrating when the color selection electrode vibrates. The tongue is arranged in, or substantially parallel to, the plane of the color selection electrode. Means are provided to exchange vibration by means of collision and/or friction between the circumferential portion of the color selection electrode and the tongue.

Display tube comprising a mask with vibration damping means

A color cathode ray tube comprises an electron gun and a deflection unit, the electron gun being arranged in a neck portion of an envelope, and the deflection unit being arranged around the envelope. The neck portion of the envelope includes a first part in which the electron gun is arranged. Behind this first part, the neck portion narrows (the outside diameter decreases). The deflection unit is at least partly provided around this narrowed part.

Cathode ray tube with narrowed neck portion

A cathode ray tube includes an electron gun having a beam-shaping portion (,) for generating electron beams (,), a prefocusing system (,) of electrodes (,) across which a prefocusing voltage is supplied during operation so as to form an electron-optical prefocusing lens, and a main lens system (,) of electrodes (,) across which a main lens voltage is applied during operation so as to form an electron-optical main lens. The electrodes (,) are provided with securing means (,) for connection to an insulating supporting body (,) and with apertures (,) for passing the electron beams (,). Electrode (,) protrudes toward electrode (,) in such a way that the mutual distance (l,) between the two electrodes at the location of the apertures (,) therein is smaller than their mutual distance (l,) at the location of their respective securing means (,). The two electrodes (,) are spaced apart at the location of the apertures (,) substantially at a distance limited by electrostatic breakdown.

Cathode ray tube provided with an electron gun, and electrostatic lens system

A vacuum device has an envelope and a getter assembly mounted within the envelope. The getter assembly includes a reservoir for containing getter material and a deflector having a surface located opposite the getter material and is oriented to deflect the getter material in a predetermined direction within the vacuum device. The deflector surface has raised and/or depressed portions, such as ribs or undulations, in the direction of diffusion of the getter material. These portions reduce the accumulation of getter material on the deflector during getterfiring, resulting in a much reduced likelihood that getter material particles may break loose from the deflector. By preventing loose particles within the vacuum device, the possibility of a short-circuit in the vacuum device is reduced.

Vacuum device having a getter device

A picture display device comprises an evacuated envelope and is provided at a first side with an electroluminescent display screen and at an opposite side with an electron gun (6). Between the electron gun (6) and the display screen, the device comprises deflection means with which an electron beam generated by the electron gun (6) can be deflected during operation. The electron gun (6) has at least an electron beam-generating portion (20) and is provided with a main lens system (40) having a first electrode (41), a final electrode (45) and at least one intermediate electrode (42-44) across which a main lens voltage is gradually applied step-wise during operation so as to form an electron-optical main focusing lens. The gun is further provided with means for presenting a dynamic potential (V.sub.d) to at least an electrode (41) of the main lens system (40), which is the first electrode viewed in the direction of propagation of the electron beam (7-9). For an increased dynamic focusing, a coupling capacitor (50) is arranged at least between said first electrode (41) and the subsequent electrode (42) of the main lens system (40).

Picture display device provided with an electron gun, and electron gun

Vacuum tube comprises a ceramic element and method of interconnecting a ceramic element and a conductive element. A conductive connection consisting of a first layer containing silver and a filler and a second layer containing silver, gold or copper is formed between the ceramic element and the conductive element. The two above-mentioned layers are bonded together by means of diffusion bonding.

Vacuum tube comprising a ceramic element and a method of interconnecting

A vacuum tube includes a ceramic element and a conductive element. A conductive connection consisting of a first layer containing silver and a filler and a second layer containing silver, gold or copper is formed between the ceramic element and the conductive element. The two above-mentioned layers are bonded together by means of diffusion bonding.

Electrodes of an electron gun are etched in an electrochemical bath. The electrodes to be etched serve as the anode in the bath. The side of the electrode to be etched which faces the cathode in the chemical bath, faces an electrode at a higher potential in the assembled electron gun.

Cathode ray tube

Display tube including a convergence correction device which comprises a plurality of correction coils having coplanar axes and being arranged around the tube neck. The coils are of the planar type. More specifically, there are two sets of four coils for generating two differently oriented four-pole fields and two sets of six coils for generating two differently oriented six-pole fields, while all these coils are arranged on one flexible support which is wound around the tube neck a number of times, for example, one set of coils for each turn.

Display tube including a convergence correction device

A display device having a pattern of conductors recessed on an electrode, thus reducing the risk of the pattern of conductors being damaged such as from a surface scratch. When the pattern of conductors and the plate are separated from each other by an insulating layer, the pattern of conductors screens the insulating layer from the electron beam. The method is characterized in that grooves are formed between the apertures, and an insulating layer and conducting layer are provided on the walls of the apertures and the grooves.

Display device and methods of manufacturing such a display device

An electron tube device comprising an electron tube having a line cathode, and an electric power source for supplying power pulses to the line cathode. The electron tube device comprises determination means for determining, during a power pulse, the value of a physical quantity which depends on the temperature of the line cathode, comparison means for comparing the value with a reference value and for supplying a control signal, and termination means to end the power pulse in dependence on the control signal. Consequently, the temperature of the line cathode is more stable.

Electron tube device and electron tube

A color display tube which comprises a display window and a phosphor pattern provided on the display window, an emission system for producing a pattern of juxtaposed rows of electron beams correlated with the phosphor pattern, an array of strip-shaped deflection electrodes situated between the emission system and the display screen for deflecting electron beams, each deflection electrode extending between adjacent rows of the emission pattern, alternate deflection electrodes being a commonly connected first group, and the remaining deflection electrodes being a commonly connected second group, is characterized in that the deflection electrodes extend asymmetrically with respect to the rows of electron beams.

Color display tube having asymmetric deflection electrodes

A display device having in an evacuated envelope a mechanically tensed thermionic linear wire cathode 4 and a bent first electrode 5 having a slit 6. The wire cathode 4 is rendered insensitive to microphonics by means of positioning means 22 which are urged against the slit 6 by the wire cathode 4.

Growing community of inventors

Eindhoven, Netherlands

Ronald Van Der Wilk