US 3,939,440 A · Wound resistor-capacitor network and method of forming

Abstract

A wound resistor-capacitor network having stable frequency response over a wide frequency range (e.g., 60 cycles to 100 kilohertz), is produced by forming a pair of aligned circumferentially extending resistance paths in one of two strips of metallized dielectric film. Forming of the resistance paths is accomplished as the two metallized strips are being wound to form an R-C network roll, by removing metal from the one strip along a first line to produce a gap in the metal layer in parallel spaced relationship to an adjacent edge of the film. Subsequently, removal of metal from the first strip also is initiated along a second line spaced inward from the first line, to produce another gap in the metal layer, thereby forming an elongated first path of desired resistance between the two lines. Metal removal along the first line then is temporarily interrupted to provide a lead termination area and a current steering path at the adjacent end of the network roll, on either side of the strip midpoint. Metal removal along a third line in alignment with the first line then is continued until an elongated second path of desired resistance has been formed between the second and third lines, at which time metal removal along the second line is terminated. Lines of metal also may be removed from the second dielectric film to provide a lead termination area and a current steering path at the opposite end of the wound network roll. Preferably, the metal is removed with the split beam of a single laser and the lines of removal are symmetrical on opposite sides of each strip's longitudinal midpoint.

Claims19

Dependent claims

A resistor-capacitor network in the form of a roll having first and second layers of convoluted electrically conducting material separated by first and second layers of convoluted dielectric material to define a capacitance, which comprises:

first and second elongated resistance paths in said first layer of electrically conducting material extending from a lead termination area defined by said first layer of electrically conducting material at one end of the network roll, circumferentially in opposite directions to connect said lead termination area to an inwardly spaced capacitance-reforming portion of said first layer of electrically conducting material.

A resistor-capacitor network roll in which alternate layers of dielectric and electrically conductive material and convoluted to produce a capacitance, characterized in that:

at least one layer of the convoluted electrically conductive material has first and second continuous elongated gaps extending lengthwise from adjacent respective ends of the electrically conductive material and terminating at points intermediate the ends of the material in spaced relationship to define a current steering path between the gaps;
and
said one layer of electrically conductive material has a third continuous elongated gap extending lengthwise between points spaced inward from the ends of the material, in parallel spaced relationship with respect to portions of the first and second gaps in the material and the current steering path defined by the spaced ends of the first and second gaps, to define first and second elongated resistance paths of desired resistance values in said one layer of electrically conductive material.

The method of forming a wound resistor-capacitor network roll, wherein alternate layers of dielectric and electrically conductive material are advanced and wound into a convoluted configuration to form a capacitance, which comprises:

initially forming an elongated first gap in at least one layer of the advancing electrically conductive material during the winding of the alternate layers of dielectric and electrically conductive material;
subsequently initiating the forming of an elongated second gap in the one layer of advancing electrically conductive material, in spaced parallel relationship to the first gap, to define a first resistance path in the one layer of electrically conductive material;
terminating the forming of the first gap in the one layer of advancing electrically conductive material while continuing to form the second gap in the material, to provide the first resistance path with a resistance of a desired value;
initiating the forming of a third gap in the one layer of advancing electrically conductive material in spaced parallel relationship to the second gap and on the same side of the second gap as the first gap, to define a second resistance path in the material;
and
terminating the forming of the second gap in the one layer of advancing electrically conductive material, to provide the second resistance path with a resistance of a desired value.

3 more elements

Dependencies are inferred from the claim text.

Wound resistor-capacitor network and method of forming

Life of this patent

Wound resistor-capacitor network and method of forming

Life of this patent

Abstract

Claims19