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US 2003/0194845 A1Published application
Method for fabricting a resistor on a printed circuit board
AssigneeCompeq Manufacturing Company Limited
InventorWen-Long Jong
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AssigneeCompeq Manufacturing Company Limited
InventorWen-Long Jong
Estimating the term…
A method for fabricating a resistor on a printed circuit board (PCB) uses a resistance film material and a dry etching process to form a resistor on the PCB. The resistance film material has low dissolvent content to prevent the resistor from shrinking and affecting the resistance of the resistor. The resistance film material has a fixed thickness, so the thickness of the resistor in the PCB is easily controlled. Furthermore, the method uses a dry etching process to precisely form the resistor on the PCB to make the length and width of the resistor pattern very accurate.
A method for fabricating a resistor on a printed circuit board (PCB), wherein the PCB has the two surfaces, the method comprising steps of
Dependencies are inferred from the claim text.
No related US applications are recorded in the indexed filing history.
Backward citations are indexed for grants only.
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By removing or adding resistive material: by laser
Adapted for trimming: by removing or adding resistive material
By removing or adding resistive material: by charged particle impact, e.g. by electron or ion beam milling, sputtering, plasma etching
Incorporating printed electric components, e.g. printed resistors, capacitors or inductors: incorporating printed resistors
Term end not estimated
1. Field of the Invention
The present invention relates to a method for fabricating a resistance on a printed circuit board (PCB), and more particularly to a method that provides accurate resistance of resistors on the PCB.
2. Description of Related Art
FIG. 1 is a flow chart of a method for fabricating a resistor on a printed circuit board (PCB) in accordance with the present invention;
FIGS. 2A to 2D are cross sectional side plan views of a first embodiment of a resistor formed by the method for fabricating a resistor on a printed circuit board (PCB) in accordance with the present invention; and
FIGS. 3A to 3C are cross sectional side plan views of a second embodiment of a resistor formed by a method for fabricating a resistor on a printed circuit board (PCB) in accordance with the present invention.
With reference to FIGS. 1 and 2, a method for fabricating a resistor (21) on a printed circuit board (PCB) (10) with two surfaces comprises steps of obtaining a resistance film material (20), applying the resistance film material (20) to at least one surface of the PCB (10) by a compress process, removing a portion of the resistance film material (20) by a dry etching process to form a physical resistor (21) on the PCB (10) and curing the physical resistor (21).
With reference to FIG. 2A, the resistance film material (20) is formed on the surface having the metallic lines (11). The applying the resistance film material (20) on the surface step uses the compress process such as vacuum compress process or wet compress with N-methyl-1-2-pyrrolidone (NMP).
With reference to FIG. 2B, a mask (100) with the resistor pattern is applied to the resistance film material (20). The resistance film material (20) not covered by the mask (20) chemically reacts with plasma ions or free radicals o. After the PCB (10) with the mask (100) is placed in a plasma etching room (not shown), the portion of the resistance film material (20) is removed.