EP0197584A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of manufacturing a resistor device having an electric resistance layer and a cathode ray tube
Assignee: Koninklijke Philips NV
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Filing: 1986-03-21
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Granted: —
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Expires: 2006-03-21
Abstract
Abstract The invention relates to a method of manufacturing a device in which a homogeneous electrical resistance layer of a resistive material having at least 10 ohm.cm is formed on an insulating substrate. According to the invention a stable binder-free suspension containing ruthenium hydroxide and glass particles is provided on the insulating substrate from which a ruthenium oxide-containing electrical resistance layer is formed by heating. The method according to the invention may be used, for example, in the manufacture of cathode ray tubes.
Inventors
- 👤 Gerardus Arnoldus Herman Maria Vrijssen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:37
CPC Classifications
H; H01; H01C; H01C7/00; H01J; H01J29/00; H01J29/86; H01J29/867; H01J29/868; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533; H01C17/0654; H01J29/46; H01J29/58; H01J29/62; H01J2229/00; H01J2229/48; H01J2229/4824; H01J2229/4827; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A method of manufacturing a device in which a homogeneous electrical resistance ' layer of a resistive material having a resistivity of at least 10 ohm. cm is formed on an insulating substrate, characterized in that from a stable binder-free suspension- containing ruthenium hydroxide and glass particles a layer is provided on the insulating substrate from which an electrical resistance layer, which contains 1 -6 percent by weight of ruthenium oxide, is formed by heating.
Claim 2
Independent Claim
75 words
A method of manufacturing a device in which a homogeneous electrical resistance ' layer of a resistive material having a resistivity of at least 10 ohm. cm is formed on an insulating substrate, characterized in that from a stable binder-free suspension- containing ruthenium hydroxide and glass particles a layer is provided on the insulating substrate from which an electrical resistance layer, which contains 1 -6 percent by weight of ruthenium oxide, is formed by heating.
Claim 3
Dependent Claim
30 words
A method as claimed in Claim 1, characterized in that the suspension is made by providing a mixture of glass particles and water, in which mixture ruthenium hydoxide is precipitated.
Claim 4
Dependent Claim
28 words
A method as claimed in Claim 2, characterized in that the precipitate of ruthenium hydroxide and glass particles is suspended in an alcohol to which ammonia is added.
Claim 5
Dependent Claim
16 words
A method as claimed in Claim 3, characterized in that isopropanol is used as an alcohol.
Claim 6
Dependent Claim
36 words
A.method as claimed in any of the preceding Claims, characterized in that after providing the layer from the suspension on the insulating substrate and prior to the heating the layer is subjected to a shaping treatment.
Claim 7
Dependent Claim
16 words
A method as claimed in Claim 5, characterized in that a mechanical shaping treatment is used.
Claim 8
Independent Claim
31 words
A method as claimed in any of the preceding Claims, characterized in that the layer is provided from the suspension on the inside of a hollow tube as the insulating substrate.
Claim 9
Dependent Claim
35 words
A method as claimed in Claim 7, characterized in that the layer is'provided from the suspension by drawing-in the suspension into the tube to a desired height and then draining the suspension from the tube.
Claim 10
Dependent Claim
30 words
A method as claimed in Claim 6 and Claim 7 or 8, characterized in that the layer on the inside of the hollow tube is given a helical form mechanically.
Claim 11
Dependent Claim
56 words
10 A cathode ray tube comprising a glass envelope consisting of a display window, a cone and a neck in which an electron gun having at least one focussing electrode is provided in the neck, characterized in that the focussing electrode is obtained by using the method as claimed in Claim 7 or 8and Claim 9.
Claim 12
Dependent Claim
66 words
A cathode ray tube comprising a glass envelope consisting of a display window, a cone, and a neck in which an electron gun having at least one focussing electrode is provided in the neck and an anti-charging layer is present on the inner wall of the neck, characterized in that the anti-charging layer is obtained by using the method as claimed in Claim 7 or 8.
Claim 13
Dependent Claim
28 words
A high-ohmic resistor for use at voltages up to at least 40 kV obtained by using the method as claimed in any of the Claims 1 to 9.
References Cited (Backward Citations)
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