US 2430433 A
Description (OCR text may contain errors)
Nov. 4, 1947. B. B. MINNIUM 3 ELECTRIC CAPACITOR Original Filed Feb. 5, 1942 FMW Patented Nov. 4, 1947 UNITED STATES PATENT OFFICE ELECTRIC CAPACITOR Byron B. Minnium, Erie, Pa., assignor to Erie Resistor Corp., Erie, Pa., a corporation of Pennsylvania Original application February 5, 1942, Serial No. 429,645. Divided and this application May 9, 1944, Serial No. 534,710
A further object of my invention is to providean arrangement of element comprising the conductors and dielectric members which are so formed that units of various capacities may be readily assembled, and which will occupy a minimum space in conjunction with the apparatus with which it is associated.
Another object of my invention is exemplified in the manner in which I form the conductors on the plates of insulating material to make a compact whole which is finally sealed, against influences such as changes of temperature and humidity, by their enclosure in a cup member which forms one terminal for a circuit connection which is in contact with all of the conductors.
To these and other ends my invention embodies further improvements and elements of construction, all of which will be more fully described, the
novel features thereof being set forth in the appended claims.
In the drawings:
Fig. 1 is an enlarged cross sectional view of a capacitor illustrating an embodiment of my invention.
Fig. 2 is a plan view thereof.
Fig, 3 is a detail sectional view of one section of the capacitor illustrating the method of applying a conductor to a dielectric.
Fig. 4 is a similar view of an end unit.
Similar reference numerals in the several figures indicate similar parts.
In carrying out my invention I utilize thin sheets of insulating substance, such as ceramic material, indicated by i, which form the dielec tric plates and, by the process of electroplating, lay thereon the conductors or plates 2 and 3 on their opposite sides. The plates I are made in the form of discs which have central perforations 4,
The plate 2 on one side of each disc extends over and around the periphery of the disc i and has an opening at its center somewhat larger than the aperture 4. The complementary conductor 3 on the other face of the disc is formed of lesser diameter than the disc but extends within the area of the aperture 4. From this formation of the conductors it will be seen that any selected number of discs may be stacked one upon the other with only the plates on their contiguous faces in electrical contact.
At both ends of the pile\ I place one of the covering units shown in Fig. 4, comprising a disc la having a central perforation 4d. On this disc a central contact I0 is formed which extends into the central opening and also overlaps a small surrounding area on one face of the disc Likewise surrounding the rim of this face of the disc and the edge thereof is another electrical conductin band ll. With these covering plates in position, a conductor I2 which may ultimately form one terminal of a circuit, is inserted into the well formed by the registered openings in the several plates of the pile. It is secured therein by solder l3 which also serves to unite the several units of the pile by uniting all of those conducting elements which extend into the disc openings.
The several parts having been thus assembled are nested into a metallic cup shaped member having an annular side wall M at the bottom of which is a rim l5 against which the bottom or inner covering unit la rests with its rim H in electrical engagement therewith. At the opposite end of the pile the outer covering unit is arranged with its metallic m gin against the rim II and in position to per it the whole pile to be sealed by the application of solder, as indicated at It.
I provide a convenient farrangement for the second'terminal of the unit'by forcing on the cup l4, within the rim IS, a crown H which may have a central perforation through which a headed and screw threaded stud l8 extends to form a means of attachment for a circuit connection I9.
What I claim as new is:
1. In an electric capacitor, a pile of ceramic plates having central openings and metallized to provide separate conductors on the opposite faces of the plates, the conductors on one of the opposite faces of the plates extending short of the central openings and over the rims of the plates, the conductors on the other of the opposite faces of the plates extending into the central openings and outwardly therefrom for a distance less than the diameter of the plates, a circuit terminal formed by uniting the conductors on said other faces by solder in the Well formed by the superimposed plates, and a second terminal electrically connected to the metallized- 3 an annular conductor adjacent the cup and sealed thereto by a bead of solder.
2. In an electric capacitor, a pile of ceramic plates having central openings and metallized to provide separate conductors on the opposite faces of the plates, the conductors on one of the opposite faces of the plates extending short of the central openings and over the rims of the plates, the conductors on the other of the opposite faces of the plates extending into the central openings and outwardly therefrom for a distance less than the diameter of the plates, a circuit terminal formed by uniting the conductors on said other faces by solder in the well formed by the superimposed plates, a second terminal electrically connected to the metallized rims of the plates comprising a cup surrounding the rims of the plates and an end plate having an annular conductor adjacent the cup and opening in the end plate registering with the openings in the other plates, and another annular conductor around the central opening in the end plate united to the solder in the well.
BYRON B. MINNIUM.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,754,268 Dubilier Apr. 15, 1930 2,157,715 Meggenhoifen May 9, 1939 1,982,411 Bailey Nov. 27, 1934 FOREIGN PATENTS Number Country Date 216,901 Great Britain July 2, 1925 440,948 Great Britain Jan. 6, 1936 500,167 Great Britain Feb. 3, 1939 463,679 Great Britain Apr. 5, 1937