US3629750A - Deflection yoke - Google Patents

Abstract

A cathode-ray tube deflection yoke having a ferrite core and carrying horizontal and vertical deflection coils. Ends of the coils and electrical leads are conductively fastened to a number of spaced electrically conductive means which are connected directly to the ferrite core. The direct connection to the ferrite core obviates the need for an external insulative terminal board.

Description

United States Patent Inventor Appl. No.

Filed Patented Assignee Frank H. Nienaber Mundelein, Ill.

May 19, 1970 Dec. 21, 1971 Television Laboratories inc. Wauconda, Ill.

DEFLECTION YOKE 3 Claims, 6 Drawing Figs.

U.S. Cl.

Int. Cl Field of Search ass/21o, 313/76 mm 1/00 ass/209,

References Cited UNITED STATES PATENTS 6/1968 Weyrich et al 9/1958 Fabel 5/1939 Oliver 8/1951 Torsch Primary Examiner-L V. Truhe Assistant Examiner-Robert O'Neil Attorney-Lettvin and Gerstman ABSTRACT: A cathode-ray tube deflection yoke having a ferrite core and carrying horizontal and vertical deflection coils. Ends of the coils and electrical leads are conductively fastened to a number of spaced electrically conductive means which i are connected directly to the ferrite core. The direct connection to the ferrite core obviates the need for an external insulative terminal board.

PATENIED BEBE] l9?! This invention relates to an improved deflection yoke for an cathode-ray tubes.

BACKGROUND OF THE INVENTION Deflection yokes for television picture tubes conventionally comprise an insulator with horizontal deflection coils saddle- I wound on the insulator. The insulator is encircled by a core on which there are toroidally wound vertical deflection coils. At the rear of the unit there is an insulative terminal board to which the horizontal and vertical deflection leads are connected.

The terminal board increases the length of the unit and is generally formed of a material such as Bakelite resin. Often a flame retardant chemical is added to terminal boards formed of Bakelite resin because of the nonfireproof character thereof.

In order to obviate the additional length of the deflection yoke caused by a terminal board located at the rear of the unit, it has been proposed to use a ring-shaped insulative terminal assembly positioned about the core. Such as assembly, which is described in U.S. Pat. No. 2,980,815 is effective in reducing the overall length of the yoke, but can be relatively expensive to produce and connections thereto may. be difficult.

l have discovered that a very effective terminal system can be provided on a deflection yoke by using a core which inherently has a nonelectrically conductive surface, such as a ferrite core. In effect, the surface of the ferrite core itself acts as a terminal board, thereby providing a relatively inexpensive unit which is simple to construct and is relatively compact.

SUMMARY OF THE INVENTION In accordance with my invention, there is provided a cathode-ray tube deflection yoke having a nonelectrically conductive core and carrying horizontal deflection coils and vertical deflection coils, The improvement comprises first and second I spaced electrically conductive means connected directly to the core. A horizontal deflection coil is connected to the first electrically conductive means and a vertical deflection coil is connected to the second electrically conductive means. Terminal wires for connection to external circuitry are electrically connected to thefirst and second electrically conductive means.

In the illustrative embodiment of the invention, the core is formed of a ferrite material with at least two abutting segments, and the first and second electrically conductive means comprise metal clips which aid in securely fastening the segments together.

A more detailed explanation of the invention is provided in the following description and claims, and is illustrated in the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevational view of a deflection yoke constructed in accordance with the principles of the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is an enlarged sectional elevation thereof, taken along the mic 4-4 ofFIG. 1;

FIG. 5 is an enlarged sectional elevation thereof, taken along the line 55 of FIG. 3; and

FIG. 6 is a schematic circuit diagram of the horizontal and vertical deflection coils of the deflection yoke illustrated in FIG. I.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT The deflection yoke of the illustrative embodiment includes insulating support member 10, preferably formed of a plastic material. Insulating support member I0 is of conventional design, having a flared portion 12 generally conforming to the flared portion of a cathode-ray tube, and a flanged end portion 14. The rear of flared portion 12 is surrounded by a 0 ferrite core 16, formed in two sections 16a and 16b. A pair of toroidally wound vertical deflection coils I8 and 20 are wound about core 16 and are separated by insulating support member 10 from a pair of horizontal deflection coils 22 and 24 which are saddle-wound on the inner surface 26 of insulating support member I0. A pair of spaced metal clips 28, 30 and spaced metal clips 32, 34 are used to clamp the core segments 16a and 16b together. Clips 28 and 30 fasten the core segments together at abutment seam 36 while clips 32 and 34 fasten the core together at abutment seam 38. Clips 28, 30, 32 and 34 are used as means for fastening the core segments together and as wire terminals as will be explained below.

Referring to the schematic diagram of FIG. 6, it is seen that vertical deflection coils l8 and 20 are connected in series with each other and one end 40 is directly connected to clip 28 while the other end 42 is directly connected to clip 30. Clips 28 and 30 are spaced on the core, but are bridged by a damping resistor 44. Horizontal deflection coils 22 and '24 are also connected in series with each other with one end 46 being directly connected to clip 32 while the other end 48 is directly connected to clip 34. Clips 32 and 34 are spaced from each other on the core 10. A balancing capacitor 50 is connected between a series junction 52 of coils 22 and 24 and clip 34.

Ends 40, 42, 46 and 48 are directly connected to the respective metal clips by solder or other suitable electrically conductive means. Leads for connection to other portions of the cathode-ray tube circuitry are provided by directly electrically connecting insulated wires to the metal clips.

Referring to FIG. I, 5 and 6 in particular, it is seen that one vertical deflection lead 54 is soldered to metal clip 28 and the other vertical deflection lead 56 is soldered to metal clip 30. Likewise, horizontal deflections leads 58 and 60 are soldered to metal clips 32 and 34, respectively. Each of the leads 54, 56, 58 and 60 comprises a conventional electrically conductive wire with an insulative coating and a bare end for fastening to the respective metal clip. The leads from the horizontal deflection coils 22 and 24 are directed from the rear of the unit to the metal clips through grooves 60 and 62 which are defined by end portion 14 as shown most clearly in FIG. 3. Lines 64 and 66, which are connected to series junction 52, are also extended from horizontal deflection coils 22 and 24 over the end portion 14 via grooves 68 and 70 defined by the end portion.

Because of the electrically nonconductive properties of ferrite material, a useful surface is formed for acting as the terminal board of the deflection yoke. In this manner, a deflection yoke can be provided that is relatively compact, simple to construct, and has inherent fire retardant properties.

Although an illustrative embodiment of the invention has been shown and described, it is to'be understood that various substitutions and modifications may be made by those skilled in the art without departing from the novel spirit and scope of the present invention.

What is claimed is:

1. In a cathode-ray tube deflection yoke having an insulating support member with a nonelectrically conductive core encircling the support member and carrying horizontal deflection coils and vertical deflection coils, the improvement comprising first and second spaced electrically conductive means connected to and contacting the core; a horizontal deflection coil connected to the first electrically conductive means, a vertical deflection coil connected to the second electrically conductive means; and terminal wires for connection to external circuitry electrically coupled to said first and second electrically conductive means.

fastening the segments together at one abutment seam; third and fourth spaced electrically conductive clips fastening the segments together at another abutment seam; means connecting at least one end of each of said horizontal and vertical deflection coils to a different one of said clips; four electrical wires having insulative coatings and each having an exposed end; and means conductively connecting each of said exposed ends to a different one of said clips.

Claims (3)

1. In a cathode-ray tube deflection yoke having an insulating support member with a nonelectrically conductive core encircling the support member and carrying horizontal deflection coils and vertical deflectiOn coils, the improvement comprising first and second spaced electrically conductive means connected to and contacting the core; a horizontal deflection coil connected to the first electrically conductive means, a vertical deflection coil connected to the second electrically conductive means; and terminal wires for connection to external circuitry electrically coupled to said first and second electrically conductive means.

2. In a cathode-ray tube deflection yoke as described in claim 1, wherein the core is formed of at least two abutting segments and the first and second electrically conductive means comprise metal clips which aid in securely fastening the segments together.

3. In a television deflection yoke having an insulating support member encircled by a ferrite core formed of at least two abutting segments and carrying horizontal deflection coils and vertical deflection coils, the improvement comprising, in combination, first and second spaced electrically conductive clips fastening the segments together at one abutment seam; third and fourth spaced electrically conductive clips fastening the segments together at another abutment seam; means connecting at least one end of each of said horizontal and vertical deflection coils to a different one of said clips; four electrical wires having insulative coatings and each having an exposed end; and means conductively connecting each of said exposed ends to a different one of said clips.

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