US3634785A - Electrical delay device of unitary configuration - Google Patents

Abstract

Disclosed herein is a delay device of unitary configuration in which a ground-side capacitor electrode is sandwiched between at least one surface of a magnetic core and one surface of a dielectric sheet. Several parallel capacitor electrodes are positioned on the other side of the dielectric sheet, and a coil is wound around the resulting laminar assembly and is connected to each of the parallel capacitor electrodes.

Description

United States Patent Inventor Kazuo Kameya Yokohama-shi, Japan Appl. No. 825,909

Filed May 19, 1969 Patented Jan. 11, 1972 Assignee Toko Kabushiki Kaisha Tokyo-To, Japan Priority Dec. 14, 1968 Japan 43/ 9 l 730 ELECTRICAL DELAY DEVICE 0F UNITARY CONFIGURATION 6 Claims, 5 Drawing Figs.

US. Cl 333/29, 333/30, 333/84 M, 333/24.l

Int. Cl 03h H03h 7/30 Field 01 Search 333/30, 31,

Primary Examiner-Eli Lieberman Assistant Examiner-C. Baraff Attorneys- Robert E. Burns and Emmanuel J. Lobato ABSTRACT: Disclosed herein is a delay device of unitary configuration in which a groundside capacitor electrode is sandwiched between at least one surface of a magnetic core and one surface of a dielectric sheet. Several parallel capacitor electrodes are positioned on the other side of the dielectric sheet, and a coil is wound around the resulting laminar assembly and is connected to each of the parallel capacitor electrodes.

ELECTRICAL DELAY DEVICE E UNITARY CONFIGURATION BACKGROUND OF THE INVENTION pedance cannot be produced. For this reason, this type of delay device is unsuitable for use in high-speed pulse circuits.

On the other hand, a lumped-constant type device of low impedance in which a coil and a large number of capacitors are combined therein has the drawback of tending to become considerably large in bulk and to become expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-impedance delay device which is highly suitable for use in highspeed pulse circuits and yet is of small size and low price. The present invention contemplates achievement of this object and other objects through the use of at least one fixed capacitor in the delay device thereby to provide an organization approaching that of a device of distributed-constant type.

According to the present invention, briefly summarized, there is provided a delay device characterized by an organization wherein a coil is wound around a laminar assembly of a dielectric sheet bonded onto at least one surface of a magnetic core with a ground-side electrode interposed therebetween and a plurality of capacitor electrodes disposed on the outer surface of the dielectric sheet opposite the ground-side electrode, each capacitor electrode being connected to the coil. 7

, In a modified form of the delay device of the invention, additional magnetic structures are disposed outside of the coil.

The nature, principle, details, and utility of the invention will be more clearly apparent from the following detailed description with respect to preferred embodiments of the invention when read in conjunction with the accompanying drawings, in which like parts are designated by like reference numerals.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. I is a perspective view showing one example of a delay device according to the invention;

FIG. 2 is a sectional view of the device illustrated in FIG. 1;

FIGS. 3 and 4 are sectional views respectively showing other examples of delay devices embodying the invention; and

FIG. 5 is an equivalent circuit diagram of a delay device according to the invention.

DETAILED DESCRIPTION In one embodiment of the invention as illustrated in FIGS. 1 and 2, a dielectric sheet 3 made of a material such as a ceramic or mica is provided on one surface (outer surface) thereof with several capacitor electrodes I and on the opposite surface (inner surface) with a ground-side electrode 2 in a weft weaving configuration by a method such as printing. The capacitor electrodes 1 are in the form of strips disposed in parallel spaced-apart arrangement and are perpendicular to the parallel reciprocating passes of the ground electrode 2. A magnetic core 4 of a material such as a ferrite is bonded to the inner surface of the dielectric sheet 3, and a coil 5 is wound continuously around the resulting assembly along the capacitor electrodes 1, one coil turn being wound over each electrode l.

In this delay device, the coil 5 employs a space winding with a pitch equal to the pitch or spacing of the capacitor electrodes l. The pitch and the wire diameter of the coil 5 and material properties of the ferrite core are suitably selected, and the coil is thereby adapted to have a desired degree of coupling with a mutually neighboring winding.

While an ordinary insulated conductor wire may be used for the coil 5,-I have found that, by using a bare conductor wire, i.'e., without a coated insulating film or a wire plated with a material such as solder, it is possible to connect the coil 5 and capacitor electrodes 1 directly by a procedure such as soldering by heating and thereby to form a delay circuit as indicated by an equivalent circuit in FIG. 5.

That is, the inductance L of the coil 5 and the electrostatic capacitance C between the ground electrodes 2 can be advantageously utilized to cause the device to possess a delay performance equivalent to that of a lumped-constant type delay device. I

In another example of the invention as illustrated in FIG. 3 external magnetic structures 6 of a material such as a ferrite are disposed on the outer sides of delay device in order to increase the inductance. In still another example of the invention as shown in FIG. 4, a dielectric sheet 3 is bonded onto each of the two sides of the magnetic core 4.

Accordingly, it should be understood that the present disclosure relates to only preferred embodiments of the invention and that it is intended to cover all changes and modifications of the examples herein chosen for the purposes of the disclosure, which do not constitute departures from the spirit and scope of the invention.

In all forms of the delay device according to the invention, the devices have the structurally advantageous features of small size and low cost similarly as devices of the distributedconstant type and the functionally advantageous features of low impedance similarly as devices of the lumped-constant type and, moreover, of relatively large delay magnitude in spite of the small size of the devices. Accordingly, the delay device of the invention is highly suitable for use in various circuits including even high-speed pulse circuits.

I claim:

1. An electrical delay device of unitary configuration comprising, in combination, at least one rigid plate-shaped dielectric sheet, a plurality of capacitor electrodes disposed on one principal surface of said dielectric sheet, a ground-side electrode disposed on the other principal surface of the dielectric sheet and arranged to cross said plurality of capacitor electrodes so that said ground-side electrode and said capacitor electrodes are intercepted by a corresponding plurality of lines disposed normal to said dielectric sheet, a plate-shaped magnetic core bonded to said other surface of the dielectric sheet with said ground-side electrode interposed therebetween, and a coil wound around the resulting assembly of said capacitor electrodes, dielectric sheet, ground-side electrode, and magnetic core and electrically connected to each of the capacitor electrodes.

2. An electrical delay device of unitary configuration as claimed in claim 1, in which said capacitor electrodes, and said ground-side electrode comprise conductors printed on said rigid dielectric sheet.

3. An electrical delay device of unitary configuration as claimed in claim I, further comprising two outer sheets of magnetic material, said capacitor electrodes, dielectric sheet, ground-side electrode, magnetic core, and coil being connected between said two outer sheets.

4. An electrical delay device of unitary configuration as claimed in claim I, in which said capacitor electrodes are arranged in a parallel and spaced-apart disposition, said coil is wound so as to contact each said capacitor electrode, and said coil is soldered to each said capacitor electrode.

5. An electrical delay device of unitary configuration comprising in combination, a plate-shaped magnetic core having two opposed principal surfaces, two ground-side electrodes disposed respectively on said opposed core surfaces, two rigid plate-shaped dielectric sheets each having one principal surface bonded respectively to said opposed core surfaces with said respective ground-side electrodes interposed therebetween, a plurality of capacitor electrodes disposed'on the other principal surfaces of each said dielectric sheet, a coil wound about the resulting assembly of said electrodes, dielectric sheets and magnetic core and electrically connected to each of said capacitor electrodes, and two outer sheets of magnetic material, said capacitor electrodes, dielectric sheets, ground-side electrodes, magnetic core, and coil being connected between said two outer sheets.

6. An electrical delay device of unitary configuration comprising, in combination, a plate-shaped magnetic core having two opposed principal surfaces, two ground-side electrodes disposed respectively on said opposed core surfaces, two rigid plate-shaped dielectric sheets each having one principal surface bonded respectively to said opposed core surfaces with said respective ground-side electrodes interposed therebetween, a plurality of capacitor electrodes disposed on the other principal surfaces of each said dielectric sheet, a coil wound about the resulting assembly of said electrodes, dielectric sheets and magnetic core and electrically connected to each of said capacitor electrodes, wherein said plurality of capacitor electrodes on each said dielectric sheet are arranged in a parallel spaced-apart disposition, said coil is wound so as to contact each said capacitor electrode, and said coil is soldered to each said capacitor electrode.

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Claims (6)

1. An electrical delay device of unitary configuration comprising, in combination, at least one rigid plate-shaped dielectric sheet, a plurality of capacitor electrodes disposed on one principal surface of said dielectric sheet, a ground-side electrode disposed on the other principal surface of the dielectric sheet and arranged to cross said plurality of capacitor electrodes so that said ground-side electrode and said capacitor electrodes are intercepted by a corresponding plurality of lines disposed normal to said dielectric sheet, a plate-shaped magnetic core bonded to said other surface of the dielectric sheet with said ground-side electrode interposed therebetween, and a coil wound around the resulting assembly of said capacitor electrodes, dielectric sheet, ground-side electrode, and magnetic core and electrically connected to each of the capacitor electrodes.

2. An electrical delay device of unitary configuration as claimed in claim 1, in which said capacitor electrodes, and said ground-side electrode compRise conductors printed on said rigid dielectric sheet.

3. An electrical delay device of unitary configuration as claimed in claim 1, further comprising two outer sheets of magnetic material, said capacitor electrodes, dielectric sheet, ground-side electrode, magnetic core, and coil being connected between said two outer sheets.

4. An electrical delay device of unitary configuration as claimed in claim 1, in which said capacitor electrodes are arranged in a parallel and spaced-apart disposition, said coil is wound so as to contact each said capacitor electrode, and said coil is soldered to each said capacitor electrode.

5. An electrical delay device of unitary configuration comprising in combination, a plate-shaped magnetic core having two opposed principal surfaces, two ground-side electrodes disposed respectively on said opposed core surfaces, two rigid plate-shaped dielectric sheets each having one principal surface bonded respectively to said opposed core surfaces with said respective ground-side electrodes interposed therebetween, a plurality of capacitor electrodes disposed on the other principal surfaces of each said dielectric sheet, a coil wound about the resulting assembly of said electrodes, dielectric sheets and magnetic core and electrically connected to each of said capacitor electrodes, and two outer sheets of magnetic material, said capacitor electrodes, dielectric sheets, ground-side electrodes, magnetic core, and coil being connected between said two outer sheets.

6. An electrical delay device of unitary configuration comprising, in combination, a plate-shaped magnetic core having two opposed principal surfaces, two ground-side electrodes disposed respectively on said opposed core surfaces, two rigid plate-shaped dielectric sheets each having one principal surface bonded respectively to said opposed core surfaces with said respective ground-side electrodes interposed therebetween, a plurality of capacitor electrodes disposed on the other principal surfaces of each said dielectric sheet, a coil wound about the resulting assembly of said electrodes, dielectric sheets and magnetic core and electrically connected to each of said capacitor electrodes, wherein said plurality of capacitor electrodes on each said dielectric sheet are arranged in a parallel spaced-apart disposition, said coil is wound so as to contact each said capacitor electrode, and said coil is soldered to each said capacitor electrode.

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