US3163834A

US3163834A - Filter

Info

Publication number: US3163834A
Application number: US65505A
Authority: US
Inventors: Richard W Malmstrom
Original assignee: Three Rivers Industries Inc
Current assignee: Three Rivers Industries Inc
Priority date: 1960-10-27
Filing date: 1960-10-27
Publication date: 1964-12-29
Anticipated expiration: 1981-12-29

Description

1964 R. w. MALMSTROM 3,

FILTER Filed Oct. 27, 1960 2 Sheets-Sheet 1 Fig.4:

INVENTOR. RICHARD MALMSTEOM United States Patent ()fiice 3,163,834 Patented Dec. 29, 1964 3,163,834 FILTER Richard W. Malmstrom, Springfield, Mass, assignor, by mesne assignments, to Three Rivers Industries, Inc., Three Rivers, Mass, a corporation of Massachusetts Filed Oct. 27, 1960, Ser. No. 65,505 2 Claims. (Cl. 333-79) This invention relates to a new and improved device for use in electrical circuits and which embodies incremently distributed inductance and capacitance.

An object of the invention is to provide a new and improved device of the type set forth which may be adapted for use in any of the applications of an artificial line, such as in time delay or pulse forming circuits, and which may also be adapted for radio interference suppression to bypass or eliminate undesirable radio frequency voltages and which has means for substantially increasing the attenuation of the device.

Another object is to provide a new and improved device of the type set forth which allows the obtaining of a more compact and less expensive but more effective device.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings in which the preferred forms of the invention have been given by way of illustration only.

Referring to the drawings:

FIG. 1 is a sectional view of a device embodying the invention;

FIG. 2 is a partially exploded view illustrating the form of device embodying the invention of FIG. 1;

FIG. 3 is an electrical schematic View of one form of the invention of FIGS. '1 and 2;

FIG. 4 is an electrical schematic view generally similar of a modified form of the invention;

FIG. 5 is a schematic view of one form of the invention;

FIG. 6 is a side view of the form of the invention shown in FIG. 5;

FIG. 7 is a schematic view of another form of the invention; and

FIG. 8 is a side view of the form of the invention shown in FIG. 7.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the invention, as shown in FIGS. 1 and 2 comprises a pair of elements or units 1 and 2 in opposed relation in container 3. Between the uni-ts is placed the cupped spring washer 4 insulated from container 3. The adjacent insulated terminals 5 are connected at 6 to each other to connect the elements or units 1 and 2 in series relation which results in a double unit with substantially increased attenuation over a unit of the same length with a single winding because the unit becomes a pi iilter.

The units it and 2 are secured in opposed relation in container 3 by crimping the edge 7 of the container over the periphery of cover 8 with the leads 5? extending through the ends of the container and having terminals 16 secured thereto.

The form of the invention of FIGS. 5 and 6 includes the insulating strips or layers 15 between which is positioned the layer 16 which is a through conducting foil.

The layer '16 of conducting material may be formed of a conductive foil, such as aluminum, copper, silver or n aluminum foil, or this layer could be a metallized deposit or coating on insulating strip or layer 15 or a conducting foil with coating of insulating material could be employed.

The insulating strips 15 could be formed of condenser paper, polyester film or other suitable insulation material.

The materials employed would depend largely on the use to be made of the product, as well as space and cost considerations.

In spaced relation and insulated from conducting foil 16 by insulating strips 15a are provided the grounded conducting strip -17.

The insulating layers 15 maybe of any suitable insulating material, for example, the impregnated type papers such as now are employed for wound condensers or the layer may be of films of plastic materials or other dielectric materials, either alone as insulating layers or with magnetic or :ferro-magnetic character or coating in which case the inductance of the conductive layers would be enhanced.

The grounded layer 17 extends beyond one edge of the conductive layer 16 and also extends beyond the.

material are then rolled into coilform, as shown in FIG.

1, or otherwise rolled or folded so as to form a relatively simple and compact device.

The rolled or folded devices are then positioned in opposed relation in a casing 3 which is preferably of conducting material, although the casing or housing could be of non-conducting material by providing suitable connections to the foils. The projection on grounded layer 17 may be compressed, forced or bonded into contact with the conductive ends 22 of the container to form a ground connection or these ends of the devices might be covered with a coating of a conductive material such as solder which could form the desired ground connection by engagement with or soldering to the housing or suitable ground connections can be applied if the housing is or is not of conductive material.

In the form of FIGS. 7 and 8, the ferro-magnetic or magnetic layer 25 is formed directly on insulating layer 15 and extends throughout the winding and the grounded foil 17 also extends throughout the winding and is insulated from conductive layer 2.7 by insulating layer 28.

The device of FIGS. 7 and 8 are rolled and placed in the container 3 in a manner similar to that previously shown and described.

The magnetic strips 20 and the magnetic coating 25 serve to increase the reactance of the device.

From the foregoing it will be seen that I have provided new and improved means for obtaining all of the objects and advantages of the invention.

I claim:

1. In a device of the character described, a pair of oppositely disposed elements connected in series relation forming a pi filter, each of said elements comprising a winding consisting of a through conducting layer, insulating material for insulating the turns of said winding from each other, and a grounded layer extending beyond an end of said insulating material and being grounded substantially throughout its length, said conducting layer being connected in a closed circuit by a pair of terminals adjacent the opposite ends of said conducting layer, said grounded layer, and a plurality of spaced magnetic portions in spaced relation upon said conducting layer for increasing the reactance of the device, each of said elements having one of its pair of terminals electrically connected to one of the pair of terminals of the other element such as to connect said elements in said series relation.

2. In a device of the character described, a pair of 0ppositely disposed elements connected in series relation forming :1 pi filter, each of said elements comprising a winding consisting of a through conducting layer, insulating material for insulating the turns of said Winding from each other, and a grounded layer extending beyond an end of said insulating material and being grounded substantially throughout its length, said conducting layer being connected in a closed circuit by a pair of terminals adjacent the opposite ends of said conducting layer, said terminals being isolated from each other by said conducting layer, saidconducting layer forming an inductance in the closed circuit in WhlCll it is connected and a distributed capacitance with said grounded layer, and a magnetic layer formed directly on said insulating rnanected to one of the terminals of the other of said elements such as to connect said elements in series relation.

References Cited by the Examiner UNITED STATES PATENTS HERMAN KARL SAALBACH, Primary Examiner;

terial for increasing the reactance of the device, each of 20 M T N Examinersaid elements having one of its terminals electrically con-

Claims

1. IN A DEVICE OF THE CHARACTER DESCRIBED, A PAIR OF OPPOSITELY DISPOSED ELEMENTS CONNECTED IN SERIES RELATION FORMING A PI FILTER, EACH OF SAID ELEMENTS COMPRISING A WINDING CONSISTING OF A THROUGH CONDUCTING LAYER, INSULATING MATERIAL FOR INSULATING THE TURNS OF SAID WINDING FROM EACH OTHER, AND A GROUNDED LAYER EXTENDING BEYOND AN END OF SAID INSULATING MATERIAL AND BEING GROUNDED SUBSTANTIALLY THROUGHOUT ITS LENGTH, SAID CONDUCTING LAYER BEING CONNECTED IN A CLOSED CIRCUIT BY A PAIR OF TERMINALS ADJACENT THE OPPOSITE ENDS OF SAID CONDUCTING LAYER, SAID TERMINALS BEING ISOLATED FROM EACH OTHER, SAID CONDUCTING LAYER FORMING AN INDUCTANCE IN THE CLOSED CIRCUIT IN WHICH IT IS CONNECTED AND A DISTRIBUTED CAPACITANCE WITH SAID GROUNDED LAYER, AND A PLURALITY OF SPACED MAGNETIC PORTIONS IN SPACED RELATION UPON SAID CONDUCTING LAYER FOR INCREASING THE REACTANCE OF THE DEVICE, EACH OF SAID ELEMENTS HAVING ONE OF ITS PAIR OF TERMINALS ELECTRICALLY CONNECTED TO ONE OF THE PAIR OF TERMINALS OF THE OTHER ELEMENT SUCH AS TO CONNECT SAID ELEMENTS IN SAID SERIES RELATION.