U.S. Philips Corporation

U.S. Philips Corpration

Johannes M Van Esdonk

Jan Hasker

Jacobus Stoffels

Josef J Van Lith

Johannes Petrus Hornman

Pieter Hokkeling

Petrus Franciscus Haans

Giok D Khoe

Petrus J Peters

Henricus A Van Hal

Jacobus E Crombeen

Jan Zwier

Johannes T Klomp

Michael Doring

Marcel Niestadt

Gerhard Heinrich De Vries

Emmanuel Papanikolau

Jacobus H Jacobs

Rene A Pluijms

Johannes H Vasterink

Antonius H Swemmers

Johannes Cornelis Vervest

Johannes P Franssen

Jan Roulaux

Laurentius C Vroomen

Antonius Matheus Bluekens

Mathieu Martinus Mattheij

Theunis Goos

Petrus A Van Dorst

Michael D Martin

Wim Kwestroo

Leendert B Jongeling

A cathode body for an impregnated scandate cathode is obtained by compressing and sintering a mixture of tungsten powder with approximately 0.5% by weight of scandium, whereafter the body is impregnated.

Scandate cathode

To reduce reflection at a surface of a cathode ray tube display window, the surface is provided with a pattern of irregularities formed by ultraviolet laser radiation. Preferably the inside surface of the display window of the cathode ray tube is treated with the pattern of irregularities followed by a phosphor pattern over the treated surface. In one embodiment, a transmission grating is used to pass ultraviolet radiation to form the irregularities.

Method of manufacturing a display window for a display device

For maintaining a monolayer of scandium which is necessary for a satisfactory emission on the surface of a scandate cathode, at least the top layer of the cathode is provided with scandium coated with a scandium oxide film. Even after repeated ion bombardment the emission is found to recover up to approximately 90% of the initial value at a current density of ca. 100 A/cm.sup.2.

Method of manufacturing scandate cathode with scandium oxide film

An oxide cathode comprising a base 1 which consists substantially of titanium and a heater element 5 coated with aluminium oxide 6 to heat the base 1, which bears a porous alkaline earth metal oxide emissive layer 4. When the surface of the titanium base 1 which is opposed to the heater element 5 bears a metal layer 7 consisting at least of one of the metals Pt, Mo, Ta and W, a solution is obtained to the problem occurring in titanium cathodes in that titanium in contact with aluminium oxide is not chemically stable. The metal layer preferably consisits of pure tungsten and is formed by chemical vapour desposition (CVD). The metal layer is preferably from 1 to 10 .mu.m thick.

Oxide cathode

A method of producing a dispenser cathode provided with a top layer, in which a main body of tungsten powder is pressed to a moulding at a first pressing pressure which is sufficient to preserve the shape of the moulding when the first pressure is removed but is not sufficient to break the powder grains to a significant extent. This moulding is thereafter provided with a top layer of a second power, whereafter the overall assembly is compressed in a second pressing operation at a second, higher pressing pressure, at which pressure the powder grains are broken to a significant extent.

Method of manufacturing a dispenser cathode; dispenser cathode

The connector comprises two coupling elements (1) in each of which end parts of light conducting fibres (9) are secured mutually in parallel beside each other in such a manner that the centers of their end faces (15) are situated on one line (17) in an end face (19) of the coupling element (1). The connector further comprises a connector housing (25) for receiving the two coupling elements (1). Each coupling element (1) has a cylindrical outer surface (20) the axis of which coincides with the axis of the light conducting core of one of the fibre end parts (9) secured therein (preferably the central one) and which is capable of cooperating with a centring member (27) of the connector housing (25). Each coupling element furthermore has an orientation element (23) which is capable of cooperating with an orientation member (29) of the connector housing (25). As a result of this the cylindrical outer surfaces (20) of the two coupling elements (1) are located with their axes in the elongation of each other and the lines (17) on which the centers of the fibre end faces (15) are located are mutually parallel. As a result of this an optimal coupling between each pair of light conducting fibres (9) is ensured.

Connector for the detachable connection of light conducting fibres

A method of manufacturing a scandate dispenser cathode having a matrix (1) at least the top layer of which consists substantially of a mixture of tungsten with scandium oxide or with a mixed oxide comprising scandium oxide. When sintering of the matrix is carried out at a temperature between 1300.degree. and 1700.degree. C., preferably at approximately 1500.degree. C. and in a hydrogen atmosphere, cathodes are obtained having a better recovery after ion bombardment compared with cathodes sintered at 1900.degree. C. Sintering in hydrogen results in a better reproducibility.

Method of manufacturing a scandate dispenser cathode and scandate

The invention relates to a method of manufacturing optical fibres in which a quartz glass tube is coated on the inside with core material, the assembly is contracted to form a solid rod which is then inserted into a quartz glass tube, after which the assembly is drawn. The last tube is thermally treated to eliminate contaminations at the surface which may detrimentally influence the tensile strength of the ultimate fibre.

Method of manufacturing optical fibres having a core and a cladding of

A contact for a semiconductor cathode is produced by thermally bonding leads consisting of one of the metals Ag, Au, Cu and one of the metals Ta, Ti, V. Such a contact does not exhibit degradation when the cathode, after mounting in a vacuum tube, is heated several times to approximately 850.degree. C. for cleaning purposes.

Method of providing electrical contact to a semiconductor cathode,

For thermocompression sealing at least one of the materials to be joined is provided with an oxide skin before or during the sealing operation. The oxide skin can be formed, for example by firing in air. It has been found that the method is particularly advantageous for seals between a CrNi-alloy and, for example a second element which consists of aluminium, for example the seal between an Al entrance window and a CrNi-steel envelope of an X-ray intensifier tube. Notably by addition of an intermediate material, in particular aluminium, seals can thus be realized between many materials.

Vacuum-tight thermocompression seal involving the formation of an oxide

In order to improve the stability of a cold cathode (5) of the reverse biased junction type, a vacuum space (2) is coupled with a reservoir (10), within which a source (21) of material reducing the work function, for example caesium, is present. By influencing the vapor pressure and the temperature in component parts (13, 16) of the reservoir (10) and in the source (21), loss of caesium due to adsorption or other phenomena occurring at the emitting surface (8) of the cathode (5) can be compensated for by an incident flow of caesium (25).

Electron emission device provided with a reservoir containing material

The ink-jet printer contains an ink-jet nozzle (1) connected to a pressure chamber (5) which is recessed in a body (7) and is covered with a diaphragm (13, 15) on which a driving element (17) is fitted. The diaphragm contains an outer plate (13) on which the driving element (17) is fitted and an inner plate (15) provided with an oblong opening (19) which extends between the pressure chamber (5) and the ink-feed channel (11). The opening (19) forms a narrow passage with very accurately defined dimensions between the ink-feed channel (11) and the pressure chamber (5).

Ink-jet printer

The invention relates to a method of manufacturing a dispenser cathode having a porous tungsten body, in which a metal oxide is provided in the body and the body is impregnated with barium. Good results as regards life and resistance to ion bombardment are obtained if the comparatively cheap oxides of gallium and indium are used.

Method of manufacturing a dispenser cathode and the use of the method

A display window (11) of a display tube is manufactured from a plate (21) having grooves (22), which plate is fused to a plate (20), so that ducts (25) are present in the display window (11). The phosphor screen (14) is provided on the inside of plate (20). The ducts (25) communicate at one end with a common supply duct (26) having an inlet aperture (27) and communicate at the other end with a common exhaust duct (28) having an outlet aperture (29). A coolant is forced through the ducts (25) for cooling the phosphor screen (14).

Display tube with fluid cooled window

A dispenser cathode body is manufactured from a sintered metallic powder. A large scandium oxide concentration is provided beneath an emissive surface of the body, resulting in increased life, increased current density, and decreased sensitivity to ion bombardment.

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Eindhoven, Netherlands

Johannes M Van Esdonk