US4097988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing thick-film resistors to precise electrical values
Assignee: Blaupunkt Werke GmbH
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Filing: 1977-06-21
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Granted: 1978-07-04
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Expires: 1997-06-21
Abstract
Abstract The resistance material of a thick-film resistor is applied to a substrate in a layer having a configuration that tapers in a direction transverse to the direction of flow of current and the conductive leads are provided in contact with the tapering edges of the layer. A small incision on the shorter side of the layer between the tapering edges to which the leads are applied will have a relatively large effect on the resistance value without great effect on the amount of the area that determines the power rating of the resistor, so that trimmming by such an incision can be done quickly and the resistance change with progressive incision is more uniform than in the case of a resistor layer of rectangular configuration.
Inventors
- 👤 Frank-Dieter Hauschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:49
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A method of manufacturing improved thick-film resistors on plane substrates, including the steps of: applying the resistance material of the thick-film resistor (1) onto a substrate in a layer so as to cause said layer to have the configuration of a finite surface bounded by at least one straight border and tapering with increasing distance from this straight border; providing two current leads (2,3) in contact with respective edges of said layer along the tapering borders of said surface, and partly removing the resistance material in a direction substantially perpendicular to said straight border from the portion of said layer located at the greatest distance from said straight border.
Claim 2
Independent Claim
109 words
A method of manufacturing improved thick-film resistors on plane substrates, including the steps of: applying the resistance material of the thick-film resistor (1) onto a substrate in a layer so as to cause said layer to have the configuration of a finite surface bounded by at least one straight border and tapering with increasing distance from this straight border; providing two current leads (2,3) in contact with respective edges of said layer along the tapering borders of said surface, and partly removing the resistance material in a direction substantially perpendicular to said straight border from the portion of said layer located at the greatest distance from said straight border.
Claim 3
Dependent Claim
75 words
A method according to claim 1, in which the thick-film resistor (1) is applied onto a substrate as a layer having the shape of a trapezoid, in which, further, the two current leads (2,3) are provided along the respective non-parallel sides of the trapezoid, and in which the partial removal of the resistance material is performed by an incision (4) in said layer starting from the shorter of the two parallel sides of the trapezoid.
Claim 4
Dependent Claim
71 words
A method according to claim 1, in which the thick-film resistor (1) is applied onto the substrate as a layer in the shape of a semicircle, in which, further, the two current leads (2,3) are provided along the semicircular border of the layer, and in which the partial removal of the resistance material is performed by an incision (4) in said layer starting from the middle of the semicircular circumferential line.
Claim 5
Dependent Claim
32 words
A method according to claim 1, in which the step of removing resistance material from the thick-film resistor layer (1) is performed by cutting out a narrow strip of the layer (4).
Claim 6
Dependent Claim
31 words
A method according to claim 4, in which the removal of resistance material from the thick-film resistor layer (1) is performed by means of a light beam of high power density.
Claim 7
Dependent Claim
18 words
A method according to claim 5, in which said light beam is produced by means of a laser.
Claim 8
Dependent Claim
30 words
A method according to claim 4, in which the removal of resistance material from the thick-film resistor layer (1) is performed by means of an electron beam in a vacuum.
References Cited (Backward Citations)
US3594679A
Cited
US3573703A
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DE2054721A1
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US3787965A
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US3889223A
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US3947801A
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US4041440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |