Method for fabricating resistors on a printed circuit board
AssigneeCompeq Manufacturing Company Limited
InventorWen-Long Jong
Life of this patent
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Abstract
A method for fabricating a resistor on a printed circuit board (PCB) uses a resistance film material, an exposure process, a photographic negative and a development process to fabricate a resistor on the PCB. The resistance film material has low content of dissolvent to prevent the resistor from shrinking and affecting the resistance of the resistor. The resistance film material has a fixed thickness, so that the thickness of the resistor in the PCB is easily controlled. Furthermore, the method uses an exposure and development process and the negative to from the resistor pattern on the PCB to make the length and width of the resistor pattern very accurate.
Claims16
A method for fabricating a resistor on a printed circuit board (PCB) with two surfaces, the method comprises the steps of:
- obtaining a photosensitive resistance film material;
- applying the resistance film material to the first or second surface of the PCB;
- transferring a resistor pattern to the resistance film material by an exposure process;
- removing the resistance film material without the resistor pattern by the development process to form a real resistor pattern;
- and
- curing the resistor pattern on the PCB.
A method for fabricating a resistor on a printed circuit board (PCB), with two surfaces, the method comprises the steps of:
- obtaining a non-photosensitive resistance film material;
- applying the resistance film material on at least one surface of the PCB by a compress process;
- applying a photo resistor on the resistance film material;
- transferring the resistor pattern to the photo resistor by the exposure process;
- removing a portion of the photo resistor without the resistor pattern by a development process to form a mask on the resistance film material;
- removing the resistance film material not covered by the mask and then removing the mask to form a physical resistor on the PCB;
- and
- curing the physical resistor.
Dependencies are inferred from the claim text.