Fuji Photo Film B.v.

Draka Comteq B.v.

Fujifilm Manufacturing Europe B.v.

Eugen Aldea

Mauritius Cornelius Maria Van De Sanden

Hindrik De Vries

Mattheus Jacobus Nicolaas Van Stralen

Igor Milicevic

Jan Bastiaan Bouwstra

Johannes Antoon Hartsuiker

Fuyuhiko Mori

Eric Aloysius Kuijpers

Hindrik Willem De Vries

Bruno Alexander Korngold

Hindrik Willem DeVries

Serguei Alexandrovich Starostine

Paul Peeters

Gerardus Franciscus Cleven

Yoichiro Kamiyama

Mariadriana Creatore

Igor Millicevic

A method for manufacturing an optical preform via an internal vapor deposition process, wherein during the inside deposition process the velocity of the reaction zone is set so that the velocity of the reaction zone over the length of the supply side-to-discharge side is higher than the velocity of the reaction zone over the length of the discharge side-to-supply side.

Method of manufacturing an optical fibre, preform and optical fibre

A method for manufacturing a primary preform for an optical fiber wherein conditions are created in the reaction zone such that one or more glass layer packages made up of at least two separate glass layers are deposited on the interior of the substrate tube. A method for manufacturing a final preform as well as primary preforms, final preforms and optical fibers obtained therewith.

Method for manufacturing a primary preform for optical fibres, primary preform, final preform and optical fibre

Method and plasma treatment apparatus for treatment of a substrate surface () using an atmospheric pressure plasma. An atmospheric pressure plasma is provided in a treatment space () between a first electrode () and a second electrode (). Furthermore, a substrate () and a mask web () in contact with the substrate () are provided. A plasma generating power is applied to the first and second electrode () for treatment of surface areas of the substrate () exposed by the mask web (), in which the substrate () and mask web () are moved synchronously through the treatment space ().

Method and apparatus for plasma surface treatment of a moving substrate

The present invention relates to a method for manufacturing a primary preform for optical fibers, using an internal vapor deposition process, wherein a gas flow of doped undoped glass-forming gases is supplied to the interior of a hollow substrate tube having a supply side and a discharge side via the supply side thereof, wherein deposition of glass layers on the interior of the substrate tube is effected as a result of the presence of a reaction zone.

Method for manufacturing a primary preform

A method and apparatus for treatment of a substrate surface using an atmospheric pressure plasma is disclosed. The method comprises providing an atmospheric pressure plasma in a treatment space between a first electrode and a second electrode, providing a substrate in contact with the first electrode in the treatment space, and applying a plasma generating power to the first and second electrodes. The first electrode has a predefined structure of insulating areas and conductive areas for plasma treatment of surface areas of the substrate corresponding to the areas in contact with the conductive areas of the first electrode.

Method and apparatus for plasma surface treatment of moving substrate

A method for manufacturing a primary preform for optical fibers using an internal vapor deposition process, including the steps of: i) providing a hollow glass substrate tube having a supply side and a discharge side, ii) surrounding at least part of the hollow glass substrate tube by a furnace, iii) supplying a gas flow, doped or undoped, of glass-forming gases to the interior of the hollow glass substrate tube via the supply side thereof, iv) creating a reaction zone in which conditions such that deposition of glass will take place on the interior of the hollow glass tube are created, and v) moving the reaction zone back and forth in longitudinal direction over the hollow glass substrate tube between a reversal point located near the supply side and a reversal point located near the discharge side of the hollow glass substrate tube.

Internal vapour deposition process

A method for manufacturing a primary preform for optical fibers using an internal vapor deposition process, including the steps of: i) providing a hollow glass substrate tube having a supply side and a discharge side, ii) surrounding at least part of the hollow glass substrate tube by a furnace, iii) supplying doped or undoped glass-forming gases to the interior of the hollow glass substrate tube via the supply side thereof, iv) creating a reaction zone in which conditions such that deposition of glass will take place on the interior of the hollow glass tube are created, and v) moving the reaction zone back and forth along the length of the hollow glass substrate tube between a reversal point located near the supply side and a reversal point located near the discharge side of the hollow glass substrate tube, wherein, during at least part of step v), the gas flow comprises a first concentration of fluorine-containing compound when the reaction zone is moving in the direction of the discharge side.

Disclosed are methods for deposition of a chemical compound or element using an atmospheric pressure glow discharge plasma in a treatment space comprising two electrodes connected to a power supply for providing electrical power during an on-time (t). The treatment space is filled with a gas composition of an active and an inert gas mixture, including a precursor of the chemical compound or element to be deposited. Dust formation is prevented by using Nitrogen in the gas composition, applying short pulses and using a predetermined residence time of the gas composition in the treatment space. Best results are obtained when using a stabilized plasma.

Method for deposition using pulsed atmospheric pressure glow discharge

The present invention relates to a method of and arrangement for removing contaminants from a surface of a substrate by subjecting said substrate surface to an atmospheric pressure glow plasma. Said plasma is generated in a discharge space comprising a plurality of electrodes, by applying an alternating plasma energizing voltage to said electrodes causing a plasma current and a displacement current. Said plasma is stabilised by controlling said displacement current during plasma generation such that modification of properties of said substrate surface is prevented.

Method of and arrangement for removing contaminants from a substrate surface using an atmospheric pressure glow plasma

Method and apparatus for generating and sustaining a glow discharge plasma in a plasma discharge space comprising at least two spaced electrodes. The method and apparatus are arranged for performing the steps of introducing in the discharge space a gas or gas mixture under atmospheric pressure conditions, energizing the electrodes by applying an AC energizing voltage (V) to the electrodes, and controlling the energizing voltage (V) such that at plasma generation a sharp relative decrease of displacement current is provided.

Method and apparatus for stabilizing a glow discharge plasma under atmospheric conditions

The present invention provides an arrangement and method for generating a uniform and stable plasma. The arrangement comprises a discharge space () between at least a pair of electrodes (), which electrodes () are arranged for providing an electric field and for generating a plasma in the electric field. At least one of the electrodes () has a boundary surface () with the discharge space (). The boundary surface is comprised of one or more alternately arranged conductive () and insulating regions (). The invention further relates to an electrode () for use in the arrangement described. The invention may, for example, be used in dielectric barrier discharge configurations, or in arrangements for generating plasmas at atmospheric pressures, or for generating plasmas at low temperatures, such as generating atmospheric pressure glow plasmas (APG) for material processing or surface () treatment purposes.

Arrangement, method and electrode for generating a plasma

Method and arrangement () for generating an atmospheric pressure glow plasma APG (), where in a plurality of electrodes, () are arranged defining a discharge space () for forming said plasma (). The electrodes () are connected to a power supply () providing an AC-voltage having a frequency of at least 50 kHz to the electrodes (). A gaseous substance () is provided in said discharge space and comprises t least one of a group of argon, nitrogen and air.

Method and arrangement for generating an atmospheric pressure glow discharge plasma (APG)

The present invention is directed to a method and arrangement for controlling a glow discharge plasma in a gas or gas mixture under atmospheric conditions, in a plasma discharge space comprising at least two spaced electrodes in which at least one plasma pulse having an absolute pulse maximum is generated by applying an AC plasma energizing voltage to the electrodes causing a plasma current and a displacement current. The plasma is controlled by providing a relative decrease of the displacement current after the pulse maximum. In a preferred embodiment, the energizing voltage is applied through a series circuit including a choke coil and a non-saturable inductor.

Method and arrangement for controlling a glow discharge plasma under atmospheric conditions

Method for generating an atmospheric pressure glow plasma (APG), wherein said plasma is generated in a discharge space between a plurality of electrodes. A dielectric is present on at least one of said electrodes, said dielectric having a boundary surface with said plasma enabling interactions between said plasma and said surface. Said dielectric is arranged for releasing electrons contributing to said plasma from said surface by said interactions.

Method and arrangement for treating a substrate with an atmospheric pressure glow plasma (APG)

Apparatus for producing and sustaining a glow discharge plasma in a plasma discharge space comprising at least two oppositely spaced electrodes, means for supplying a gas or a gas mixture under atmospheric pressure conditions in the discharge space, AC power supply means for energizing the electrodes, and electric stabilisation means for stabilizing current variations in the plasma. The stabilisation means connect between the electrodes and the power supply means, and are arranged for providing a negative feedback opposed to a positive feedback of the plasma to instabilities in the plasma.

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Eindhoven, Netherlands

Eugen Aldea