JPS5812361Y2 - electromagnetic deflection yoke - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electromagnetic deflection yoke used in a television receiver, and aims to provide an electromagnetic deflection yoke that is simple in structure and has good deflection efficiency.

Conventional electromagnetic deflection yokes have a horizontal deflection coil and a vertical deflection coil attached to a trumpet-shaped molding frame, and the molding frame is large, resulting in a large structure and disadvantages of poor deflection efficiency. be.

Therefore, the present invention aims to provide an electromagnetic deflection coil with a simple structure and good deflection efficiency.One embodiment of the present invention will be described below with reference to the drawings.

Generally, the deflection efficiency is expressed as Li2 (mH-A2), and L
Here, L is the inductance of the coil, n is the number of turns of the coil, tf is the effective magnetic field length, Dn is the neck diameter, D is the core inner diameter, and ■ is the current.

Therefore, the deflection efficiency LI2 is expressed as follows.

In this way, the deflection efficiency is inversely proportional to the inner diameter of the core.

In other words, setting the inner diameter of the core to a small value σ improves the deflection efficiency.

The present invention focused on this point and was constructed as shown in FIGS. 1 to 3.

That is, a molding frame 3 is provided which can accommodate the bare door knob portion 2 at the rear end of the horizontal deflection coil 1 wound in a spiral shape.

This molding frame 3 is provided in two parts, and the recesses 4 of one molding frame are engaged with the engagement protrusions of the other molding frame to form an integral piece.

5 is an engagement protrusion on one of the molding frames. This molding frame 3 is provided with an attachment part 6 for attaching to the neck of the cathode ray tube, and a tightening band is attached to the attachment part 6 for attachment to the neck of the cathode ray tube.

Further, a guide piece 8 protruding toward the front end of the horizontal deflection coil 1 is integrally molded on the molding frame 3, and a protrusion 9 is provided here, and a pair of horizontal deflection coils la, lb
The end faces of the coils 1a and lb are brought into contact with each other to separate the coils 1a and lb.

A trumpet-shaped insulator 10 shown in FIG. 3 is provided so as to cover the intermediate portion of the horizontal deflection coil 1.

This insulator 10 is made of a thin resin sheet, and may be formed using, for example, a vacuum forming method.

Since this insulator 10 is thin, it is highly elastic, and by providing a cut portion 11 in a portion, it can be easily attached to the horizontal deflection coil 1.

A pair of cores i2a and 12b are provided by dividing the trumpet-shaped core 12 into two in the vertical direction, and the vertical deflection coil 1 is provided here.
3 each.

The cores 12a, 12b are placed on the insulator 10 and the metal fittings 14 are placed in the recesses 16a of the cores 12a, 12b.

15b and connect.

A metal fitting is also provided on the opposite side of the drawing 14 in FIG.

A protrusion I is provided on the back side of the guide piece 8 of the forming frame 3,
Cores 12a and 12b are adapted to come into contact with this protrusion 1.

Adhesive is applied across the front end of the vertical deflection coil 13, the front end of the insulator 10, and the horizontal deflection coil 1 to fix them together.

Adhesive may also be applied to the rear end of the vertical deflection coil 13 in the same manner.

With the above configuration, the molding frame 3 can be made up of a portion that accommodates the pend-up portion 2 of the horizontal deflection coil 1 and an attachment portion 6 to the neck portion of the cathode ray tube, so that the molding frame 3 can be made compact. It is something that can be done.

Since the insulator 10 may be in the form of a thin sheet, the diameter of the core 12 can be reduced, and the deflection efficiency can be improved accordingly.

As described above, according to the present invention, the electromagnetic deflection yoke can be downsized and the deflection efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of an electromagnetic deflection yoke according to an embodiment of the present invention, Fig. 2 is a front view of the same electromagnetic deflection yoke, and Fig.
The figure is a perspective view of an insulator used in the electromagnetic deflection yoke. DESCRIPTION OF SYMBOLS 1... Horizontal deflection coil, 2... Pend-up part, 3... Molding frame, 6... Mounting part, 10... Insulation Body, 12... Core, 13... Vertical deflection coil.

Claims (1)

[Scope of utility model registration request] The pend-up part of the rear end of the horizontal deflection coil wound in a spiral shape is housed in a molding frame that has an attachment part to the neck of the cathode ray tube, and a thin insulator is placed so as to cover the middle part of the horizontal deflection coil. An electromagnetic deflection yoke that includes a trumpet-shaped insulator made of a sheet, and a core in which a vertical deflection coil is toroidally wound to cover the insulator.