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EP0509582A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

SMD-resistor

Assignee: Koninklijke Philips NV
•
Filing: 1992-04-07
•
Granted: —
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Expires: 2012-04-07
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Abstract

Abstract A description is given of a SMD-resistor comprising a ceramic substrate which is bounded by two main faces, two side faces and two end faces, and further comprising two contact layers which are provided on two ends of a main face which adjoin the end faces, a resistive layer which is applied to this main face and which electrically contacts both contact layers, as well as two end contacts which cover the end faces of the substrate and which electrically contact the contact layers, characterized in that the end faces are intergranular fracture faces. Further, a description is given of a method by means of which such a resistor can be manufactured. <IMAGE>

Inventors

  • 👤 Bralt Renze Schat

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 23:22
CPC Classifications
H; H01; H01C; H01C7/00; H01C17/00; H01C17/06; H01C1/00; H01C1/14; H01C1/144; H01C17/006

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 87 words
A SMD-resistor which comprises a ceramic substrate having two main faces, two side faces and two end faces, and which further comprises two contact layers which are applied to two ends of a main face which adjoin the end faces, a resistive layer which is applied to this main face and electrically contacts both contact layers, as well as two end contacts which cover the end faces of the substrate and which electrically contact the contact layers, characterized in that the end faces are intergranular fracture faces.
Claim 2
Dependent Claim 40 words
A SMD-resistor as claimed in Claim 1, characterized in that the ceramic substrate is an alumina substrate comprising SiO₂ and MO, where M stands for Ca, Sr and/or Ba, and in that the SiO₂/MO-molar ratio ranges between 1 and 6.
Claim 3
Dependent Claim 22 words
A SMD-resistor as claimed in Claim 2, characterized in that the second-phase content of the substrate ranges from 6 to 10 mol%.
Claim 4
Independent Claim 110 words
A method of manufacturing a SMD-resistor, in which method contact layers and resistive layers are applied to a ceramic substrate plate which is provided with a first number of parallel fracture grooves and a second number of parallel fracture grooves extending substantially perpendicularly thereto, after which the substrate plate is broken along the first number of fracture grooves to form bars which are provided with end contacts on the fracture faces formed in the breaking operation, whereupon the bars are broken along the second number of fracture grooves to form individual SMD-resistors, characterized in that in the process of breaking the substrate plate into bars intergranular fracture faces are formed.
Claim 5
Dependent Claim 42 words
A method as claimed in Claim 4, characterized in that a ceramic alumina substrate plate is used which comprises SiO₂ and MO, where M stands for Ca, Sr and/or Ba, and in that the of SiO₂/MO-molar ratio ranges between 1 and 6.
Claim 6
Dependent Claim 22 words
A method as claimed in Claim 5, characterized in that the second-phase content of the plate ranges from 6 to 10 mol%.

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