U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Hermanus N Tuin

Jan G Peelen

Wilhelmus C Meerman

Marcel Niestadt

Johannes Feenstra

Gehardus Meintes Oosterhout

Johannes Hm Damen

Georgius Petrus Jozef Kuin

Marius A Klop

Piet C Van Rens

Henricus J Ligthart

Willem Van Der Hoek

Harm Tolner

Franciscus M Van Laarhoven

Maarten A Van Andel

Jan W Kleine

Cornelus Hm Van Bommel

Rudolf O Lobel

Johannes Th Leijten

Wilhelmus Nm Selten

Antonie Schrederhof

Wilhelmus N M Selten

Martinus P W Van Roosmalen

Martinus Gfc Sanders

A method for manufacturing a display tube includes press-forming molten glass in a mold, cooling the formed glass after it has been taken out from the mold, and reducing the temperature gradient between center and edge of the panel by reflecting heat radiation back to a central portion of the panel.

Method for manufacturing a glass panel for a cathode ray tube

A method for producing CRT screens includes the step of reducing the cooling rate of part of a press-formed glass screen during the cooling stage. The outside portion of the screen, i.e., the side normally facing a viewer, normally has a higher cooling rate than the inside portion of the screen, which leads to unwanted stresses in the finished product. The cooling rate of the outside portion of the screen is reduced by reflecting the heat radiating from the outside portion during the cooling process, and/or providing extra heat to the outside portion from a heater. The reduction in the cooling rate is preferably done during the transport of the glass screen from the press to the cooling oven. The method provides for systematic cooling of the inside and outside portions of the glass screen at nearly the same cooling rate.

Method for manufacturing glass panel for a cathode ray tube

A method for manufacturing display tube includes a first stage of press-forming molten glass put in a mold using a plunger, and a second stage of cooling the formed glass after it has been taken out from the mold. After removal of the plunger the heat radiation of the inner face portion of the central panel portion is reduced.

A method and device for the manufacture of a hollow cone ( ) with a cone tip ( ) whereby a parison of viscous material ( ) is moulded into the shape of the hollow cone. An escape space ( ) becomes accessible to the material in the vicinity of a cone tip to be formed. The moment the pressure present in the material in the vicinity of the cone tip to be formed exceeds a previously defined value. Breaking-off of the cone tip during or after moulding is prevented by this. The hollow cone is suitable inter alia for use in a cathode ray tube.

Device for pressing two mold portions together and controlling an internal pressure so as to create a hollow cone

A method of manufacturing a hollow cone having an open side and a cone tip. The method utilizing the steps of introducing a viscous material in a first mold portion, introducing a second mold portion and contacting the viscous material therewith, providing a force in an escape space so as to prevent the viscous material from flowing into the escape space, forming the open side of the hollow cone while preventing the viscous material from entering the escape space and causing the viscous material to enter the escape space to form the cone tip.

Method of pressing two mold portions together and controlling an internal gas pressure so as to create a hollow cone for receiving excess molding material

The thin-type display device (1) has a transparent front wall (3), which is provided with a display screen, and a rear wall (24) which extends parallel to said front wall (3), and said display device comprises at least an electron source and a duct structure. The display device (1) is characterized in that the rear wall (24) and walls (22, 22', 22') of the ducts of the duct structure are manufactured in a single piece. Preferably, the walls (22, 22', 22') of the ducts widen in the direction of the rear wall (24), with the angle, which opposing faces of the walls (22, 22', 22') of the ducts make with each other, ranging from 1.degree. to 30.degree.. Preferably, the rear wall (24) further comprises at least an upright side wall (32), which is integral with the rear wall (24). Preferably, the walls (22, 22', 22') are made from a glass having a temperature interval between the operating temperature and the softening temperature of less than 420.degree., perferably less than 360.degree., and the duct structure and the side walls (32) can be pressed in one process step.

Thin-type display device with one-piece rear wall

A display device includes: a rear wall (4); a display panel (3) spaced from the rear wall (4) and a display screen (7) having a pattern of phosphor pixels; an addressing structure (100) disposed intermediate the rear wall (4) and the display panel (3) for addressing the display screen (7); and an aperture spacer plate (101); wherein, the spacer plate (101) includes a glass material having an electrical resistance of log R at 250.degree. C..gtoreq.8. The spacer plate (101) including a glass material having an electrical resistance of log R at 250.degree. C..gtoreq.8 reduces the charging of the spacer plate walls and improves uniformity of phosphor brightness. The spacer plate may further comprise a glass having a lower alkali mobility less than sodium lime glass.

Thin-panel display having resistive spacer plate

The inner surface of a cathode ray tube is roughened by blasting the surface with a suspension which comprises radiation particles, the inner surface being irradiated in such a manner that it satisfies the inequalities 0.05 .mu.m&lt;R.sub.a &lt;0.5 .mu.m and R.sub.z &lt;4 .mu.m and, preferably, 0.1 .mu.m&lt;R.sub.a &lt;0.2 .mu.m. The reflection at such a surface is comparable to the reflection at an etched surface. The method in accordance with the invention is safer and less harmful to the environment.

Method of manufacturing a display window for a cathode ray tube and a

The invention relates to a method of manufacturing a display tube in which a transparent plate 9 is secured to the display window 2 by securing means 10 located between and exclusively along the edge portions of the display window 2 and the transparent plate 9. Subsequently, the envelope and the space 12 between the display window and the transparent plate 9 are evacuated substantially simultaneously. An optical coupling means is then provided in the space 12 between the display window 2 and the transparent plate 9.

Display tube and method of manufacturing such a display tube

An apparatus for saturating a gas with the vapor of a liquid is formed by two chambers. In the first chamber the gas is passed through the liquid which has a higher temperature than the temperature at which the gas must ultimately have been saturated on leaving the apparatus. Thereafter, the gas is passed into a second chamber. The liquid in said chamber has the temperature at which the gas must be saturated.

Apparatus for saturating a gas with the vapor of a liquid

A bundle of parallel glass tubes (27) is passed through openings (29) in parallel alignment plates (5) which divide the bundle into a central portion (31) in a zone between the two alignment plates and two end portions (33) beyond this zone. Subsequently, the tubes are softened by heating and the central portion of the bundle is constricted. Subsequently, the central portion is embedded in a moulding compound which, when set, forms two coupling pieces (1) for printing heads, which coupling pieces can be separated from one another along a separating plane (37) which extends parallel to the alignment plates. Thus, important parts of at least two printing heads are manufactured simultaneously.

Method of manufacturing printing heads for ink jet printers

Tubes, consisting of an electrically insulating material such as SiO.sub.2, are internally coated by reactive deposition form a gas mixture passing through the tube. The deposition is activated by a plasma reciprocally moving along within the tube. The plasma is formed in the tube by high-frequency electric energy capacitively applied to the gas phase by means of two flames which impinge upon the outside of the tube at two longitudinally spaced sites. The sites are reciprocally moved along the tube during the reactive deposition. A high-frequency generator is electrically connected to the burners generating the flames. An apparatus for coating tubes comprises a gas supply system, burners for generating a plasma and means for moving the burners.

Method and arrangement for internally coating a tube by reactive

An optical fiber cable comprising a cylindrical body and optical fibers which are located, and periodically fixed, in respective grooves in the body. The grooves extend along the length of the body in a helical manner, which may periodically change its sense of rotation. The grooves are either in the surface of the body or in the inner surface of a jacket surrounding the body. The fibers may be fixed after every full turn by means of a wire located in a longitudinal groove which crosses the grooves in which the fibers are fixed. The fibers may alternatively be periodically fixed by means of a longitudinally extending adhesive strip. The whole assembly may be provided with a layer of wound tape and a jacket.

Optical fiber cable

Method of and apparatus for manufacturing optical fibers in which a preform is heated in a furnace which is provided with a graphite heating element and a fiber is drawn from the heated preform. The fiber is subsequently cooled, provided with a coating, and, after drying of the coating, the fiber is wound onto a reel. For applying a coating to the fiber, the fiber is passed through a nozzle which has a polygonal nozzle opening.

Coating apparatus for manufacturing optical fibers

Method of and apparatus for manufacturing optical fibers in which a preform is heated in a furnace which is provided with a graphite heating element and a fiber is drawn from the heated preform. The fiber is subsequently cooled, provided with a coating, and, after drying of the coating, the fiber is wound onto a reel. During drawing of the fiber, the preform and fiber are flushed with a gas. According to the invention the gas with which the fiber is flushed is passed along a condensation element.

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Eindhoven, Netherlands

Hermanus N Tuin