JPH0785818A - Deflection yoke - Google Patents

Abstract

PURPOSE:To position a core easily and highly accurately by pressing the inner side surface of the core held on a specific position and by having the axis of the core coincided with the axis of a coil bobbin. CONSTITUTION:A core is formed by sintering ferrite and is used in combination of a pair of cores 3 formed into symmetric shapes with one another. An annular core of a conical cylindrical shape of a vertical coil assembly 1 is formed of the core 3 to provide a magnetic circuit. After one end of the core 3 of the vertical coil assembly 1 is pressed to the center of coil bobbin 2A or 2B between ribs 5 and 6, the other end is turned around the pressed position serving as a center. The core 3 is pushed between the ribs 5 and 6 of the bobbin 2A or 2B. The upper end surface 11 of the core 3 of the assembly 1 is pressed to the upper rib 5 of the bobbins 2A and 2B, and positioning can be carried out so that the axis of the core 3 coincides with the axis of the bobbins 2A, 2B with an end surface 11 serving as a reference point.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 2 to 7) Action (FIGS. 2 to 7) Example (1) Configuration of Example (FIG. 1 to FIG. 1) (FIG. 7) (2) Effect of Example (3) Other Example Effect of Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke, and can be applied to, for example, a computer display device.

[0003]

2. Description of the Related Art Conventionally, in this type of computer display device, a pair of horizontal deflection coils and vertical deflection coils are arranged so as to surround the neck of the cathode ray tube from above, below, left and right, respectively. Electromagnetic deflection is performed by the deflection coil so that a desired raster image can be formed.

At this time, in the deflection yoke formed by winding the horizontal deflection coil and the vertical deflection coil in a saddle shape, a substantially conical cylindrical core is arranged so as to surround the horizontal deflection coil and the vertical deflection coil. A magnetic circuit for a horizontal deflection magnetic field and a vertical deflection magnetic field is formed by this core. Thus, in the deflection yoke, the deflection magnetic field can be efficiently formed to form a raster image.

At this time, in the deflection yoke, the ferrite is sintered to form the core, thereby reducing the loss of the magnetic circuit and efficiently forming the deflection magnetic field. Further, in the deflection yoke, the core is held on the coil bobbin and then positioned by using a predetermined jig, and then an adhesive is applied to fix the core at the positioned position. The core is positioned and held on the coil bobbin so that the central axis determined by the outer shape and the central axis of the coil bobbin coincide with each other.

That is, this type of core is characterized by a large shrinkage ratio and extremely poor dimensional accuracy due to sintering of ferrite. On the other hand, in the deflection yoke, if the holding position of the core changes,
Characteristics such as convergence will vary.

Therefore, in the conventional deflection yoke,
The characteristic variation is sufficiently reduced to efficiently form the deflection magnetic field.

[0008]

By the way, in this type of core, the core is positioned such that the central axis determined by the outer shape of the core and the central axis of the coil bobbin are aligned by varying the thickness. Could not be positioned in the correct position, and there was a problem that the characteristics varied.

As a method of solving this problem, a method of cutting the inside of the core to improve the dimensional accuracy of the core can be considered. However, in this method, there is a problem that the manufacturing process of the deflection yoke becomes complicated accordingly. is there.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a deflection yoke capable of positioning a core easily and with high accuracy.

[0011]

In order to solve such a problem, according to the present invention, a predetermined coil bobbin 2 holds a substantially conical cylindrical core 3, and a magnetic circuit is formed by the core 3 to form a deflection magnetic field of a cathode ray tube. In the deflection yoke (1) that forms the core bobbin 2, the core 3 is formed by combining first and second cores 3A and 3B of the same shape divided by a plane passing through the central axis, and the coil bobbin 2 is a predetermined coil bobbin 2. The coil 3 holds the core 3 so as to surround the position, and the coil bobbin 2 is arranged such that at least one pair of elastic pieces 13 are opposed to each other with the central axis as a reference, and the elastic piece 13 holds the core 3 at a predetermined position.
By pressing the inner surface of the core 3, the core 3 is positioned so that the central axis of the core 3 and the central axis of the coil bobbin 2 substantially coincide with each other.

Further, in the second invention, the coil bobbin 2 forms a curved surface of a funnel curve along the inner side surface of the core 3, and holds the core 3 at a predetermined position so that the core 3 surrounds the curved surface of the funnel curve. Then, the elastic piece 13 is formed on the curved surface of the funnel curve.

Further, in the third invention, the coil bobbin 2 is formed so as to face the lower end surface of the core 3 so as to face the positioning member 5 and the positioning member 5 for positioning the upper end surface 11 of the core 3. The collar 6 and the elongated rib 12 that gradually rises toward the positioning member 5 are provided on the collar 6, and when the core 3 is held, the core 3A (3B)
By scraping off the ribs 12 and holding the core 3 at a predetermined position, variations in the core 3 are absorbed by the ribs 12 and the core 3 is pressed against and held by the positioning member 5.

[0014]

Function: At least one pair of elastic pieces 1 based on the central axis
3 are arranged on the coil bobbin 2 so as to face each other, and by pressing the inner surface of the core 3 held at a predetermined position by the elastic piece 13, the center axis of the core 3 and the center axis of the coil bobbin 2 can be easily assembled. The core 3 can be positioned so that and match.

At this time, a curved surface of a funnel curve is formed on the coil bobbin 2 along the inner surface of the core 3, and an elastic piece 13 is formed on this funnel curve so that the central axis of the core 3 and the central axis of the coil bobbin 2 are formed. The core 3 can be positioned so that

The upper end surface 11 of the core 3 is positioned by the positioning member 5, and an elongated rib 12 gradually rising toward the positioning member 5 is formed on the collar 6 formed so as to face the positioning member 5, and the core 3 is formed. When holding the core 3
A (3B) scrapes off the rib 12 to hold the core 3 at a predetermined position, so that variations in the core 3 are absorbed by the rib 12 and the core 3 is pressed against the positioning member 5 to be held. By the work, the core 3 can be positioned in the tube axis direction of the cathode ray tube.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Structure of the Embodiment In FIG. 1, reference numeral 1 denotes a vertical coil assembly of deflection coils as a whole, a vertical coil bobbin 2 for winding the vertical deflection coil in a section, a vertical coil wound around the vertical coil bobbin 2, and a core. 3 and 3. As a result, in this embodiment, the deflection yoke has the horizontal coil assembly arranged inside the vertical coil assembly 1, followed by attaching the front cover and the rear cover, and then connecting the vertical coil and the horizontal coil to a predetermined terminal board. It is designed to be assembled.

Here, as shown in FIGS. 2 and 3, in the vertical coil assembly 1, the vertical coil bobbin 2 is used.
Is a pair of coil bobbins 2A formed in a substantially symmetrical shape.
The coil bobbins 2A and 2B are formed by combining the coil bobbins 2A and 2B. The coil bobbins 2A and 2B each have a substantially conical cylindrical body portion 4 and ribs 5 extending toward the periphery at the upper and lower ends of the body portion 4.
And 6 and.

Further, in the coil bobbins 2A and 2B, the ribs 5 and 6 are provided with a pawl 7 and a through hole 8 to be fitted into the pawl 7, whereby the pawl 7 and the through hole 8 are fitted to each other and the vertical coil bobbin 2 is formed. Can be easily formed.

Further, the coil bobbins 2A and 2B are formed by forming a plurality of ribs 9 on the inner side surfaces of the ribs 5 and 6, respectively, and extending these ribs 9 up and down, respectively, and then bending them at a substantially right angle toward the periphery. Has been done. As a result, the vertical coil bobbin 2 hooks the magnet wire on the rib 9 and reciprocates the magnet wire between the ribs 5 and 6, thereby applying the so-called section winding method to wind the vertical deflection coil. It is designed to get you.

Thus, the vertical coil assembly 1 forms the vertical coil bobbin 2 in which the vertical coil is wound in this manner, and then the core 3 is attached to the vertical coil bobbin 2 to complete the assembly.

Here, in the core 3 applied to this embodiment, as shown in FIG. 4, a pair of cores 3A and 3B formed by sintering ferrite and formed in a substantially symmetrical shape.
The vertical coil assembly 1 is configured to form a ring-shaped core having a substantially conical cylindrical shape with the cores 3A and 3B to form a magnetic circuit.

At this time, as shown in FIG. 5 (here, the vertical deflection coil is omitted), the vertical coil assembly 1 is used.
Has one end of the core 3A and 3B connected to the coil bobbin 2A or 2
After pressing it between the ribs 5 and 6 at approximately the center of B, the arrow a
, The rib 5 of the coil bobbin 2A or 2B is rotated by rotating the other end around the pressed position.
Push cores 3A and 3B between and 6. As a result, the vertical coil assembly 1 presses the upper end surfaces 11 of the cores 3A and 3B against the upper ribs 5 of the coil bobbins 2A and 2B, and the upper ribs 5 serve as the reference for the upper end surfaces 11 of the cores 3A and 3B. Is designed to be positioned.

That is, as shown in FIG. 6 by showing the cross section of the lower rib 6, the coil bobbins 2A and 2B form elongated ribs 12 that gradually face each other at positions facing the coil bobbins 2B and 2A and that gradually rise. To do.
When the ribs 12 are pushed between the ribs 5 and 6 by rotating the cores 3A and 3B as described above, the tips of the ribs 12 are the cores 3.
Even if the width of the cores 3A and 3B is selected so that the cores 3A and 3B can be easily scraped off and the cores 3A and 3B vary in size, the cores 3A and 3B are pressed against the upper rib 5. The height is selected so that it can be applied.

Thus, in the vertical coil assembly 1, when the cores 3A and 3B are attached to the coil bobbins 2A and 2B, the ribs 12 press the cores 3A and 3B against the upper rib 5, and at this time, the cores 3A and 3B press the ribs 12 together. By scraping off, variations in the cores 3A and 3B are absorbed by the ribs 12, whereby the cores 3A and 3B can be easily and accurately positioned in the tube axis direction of the cathode ray tube.

Further, the coil bobbins 2A and 2B have the cores 3A and 3B which have the cores 3A and 3B thus assembled.
The body portion 4 is formed by a curved surface of a funnel curve so that the inner side surfaces of A and 3B and the outer side surfaces of the coil bobbins 2A and 2B are held substantially parallel to each other.

Further, the coil bobbins 2A and 2B are shown in FIG.
As shown in FIG. 3, elastic pieces 13 are formed in the body portion 4 facing the coil bobbins 2A and 2B at substantially the center thereof so as to face each other. The elastic piece 13 is formed so as to project outward from the outer surface of the body portion 4, and is formed to bend when pressed inward.

Thus, in the vertical coil assembly 1, when the cores 3A and 3B are attached to the coil bobbins 2A and 2B, the inner side surfaces of the cores 3A and 3B abut against the elastic piece 13. At this time, in the vertical coil assembly 1, since the elastic pieces 13 are formed at the positions where the coil bobbins 2A and 2B abut, the elastic pieces 13 abut the cores 3A and 3B substantially at the centers of the arc-shaped cores 3A and 3B. Made by this, core 3
Is absorbed by the deformation of the elastic piece 13 so that the axial center of the core 3 and the axial center of the vertical coil bobbin 2 coincide with each other.

That is, the core 3A having an arcuate cross section in this way
In 3 and 3B, if the elastic piece 13 abuts the cores 3A and 3B at approximately the center, even if the cores 3A and 3B are deformed in an irregular shape and the opening of the arc shape changes, the vertical coil assembly 1 Cores 3A and 3B
The axial center of the core 3 formed in 1 can be always held at a predetermined position. Corresponding to this, the elastic pieces 13 are formed at the abutting positions of the coil bobbins 2A and 2B so as to face each other, so that the vertical coil assembly 1
Are arranged such that the elastic pieces 13 are arranged symmetrically with respect to the axial center, and when the elastic pieces 13 facing each other are deformed equally, the axial center of the core 3 can always be held at the axial center of the vertical coil bobbin 2. it can.

Thus, in practice, in this type of molded product, the shape of the elastic piece 13 can be formed with high precision, so that the elastic piece 13 is deformed by the pressing force of the cores 3A and 3B pressing the elastic piece 13. The amount can be kept substantially equal to the amount of deformation so that the vertical coil assembly 1 can always keep the axial center of the core 3 at the axial center of the vertical coil bobbin 2. As a result, in the deflection yoke, the core can be positioned with high accuracy by a simple assembling work, compared with the case where the core is positioned based on the outer shape of the core.

Further, at this time, the body portion 4 is formed by a curved surface having a funnel curve in its cross section, and the elastic piece 13 is attached to the core 3 at the substantially central portion of the curved surface.
It is possible to sufficiently suppress the characteristic variation due to the variation of.

(2) Effects of the Embodiments With the above-described structure, the elastic piece 13 formed on the body portion 4 of the coil bobbin 2 is pressed against the inner surface of the core 3 so that the core 3 can be easily assembled. The core 3 can be positioned so that the central axis and the central axis of the coil bobbin 2 substantially coincide with each other.

In addition to this, the upper end surface 11 of the core 3 is positioned by the rib 5 which is a positioning member, and the elongated rib 12 formed on the collar 6 facing the positioning member 5 absorbs variations in the core 3. By pressing and holding the core 3 against the positioning member 5, the core 3 can be positioned in the tube axis direction of the cathode ray tube by a simple assembly work.

(3) Other Embodiments In the above-described embodiment, the coil bobbins 2A and 2 are used.
The case where the elastic piece 13 is formed at the butting portion of B has been described, but the present invention is not limited to this, and the point is that the coil bobbin 2
The elastic piece 13 may be deformed so that the axis center of the core 3 can be correctly aligned with the axis center of the above. For this purpose, a plurality of pairs of elastic pieces may be arranged symmetrically as necessary.

Further, in the above embodiment, the case where the vertical deflection coil and the horizontal deflection coil are wound in the saddle type has been described, but the present invention is not limited to this, and for example, the deflection in which the vertical deflection coil is wound around the core is provided. It can be widely applied to a yoke or the like. In this case, the elastic piece may be arranged so as to avoid this winding, and the shape of the rib 5 may be changed to form the positioning member.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the deflection yoke of the computer display has been described, but the present invention is not limited to this and can be widely applied to the deflection yoke of various monitor devices. .

[0038]

As described above, according to the present invention, the elastic piece formed on the coil bobbin is pressed against the inner surface of the core to hold the core, so that the central axis of the core and the coil bobbin can be easily assembled. It is possible to position the core so that the center axis thereof substantially coincides with the core axis, and thus it is possible to obtain a deflection yoke that can easily and accurately position the core.

[Brief description of drawings]

FIG. 1 is a side view showing a vertical coil assembly of a deflection yoke according to an embodiment of the present invention.

FIG. 2 is a side view showing the coil bobbin.

FIG. 3 is a side view showing the vertical coil bobbin.

FIG. 4 is a front view showing the core.

FIG. 5 is a front view for explaining the assembling of the core.

FIG. 6 is a cross-sectional view showing ribs of a coil bobbin.

FIG. 7 is a side view showing an elastic piece of a coil bobbin.

[Explanation of symbols]

1 ... Vertical coil assembly, 2, 2A, 2B ... Coil bobbin, 3, 3A, 3B ... Core, 5, 6, 9, 12
...... Rib, 13 ...... Elastic piece.

Claims (3)

[Claims] 1. A deflection yoke in which a core having a substantially conical cylindrical shape is held on a predetermined coil bobbin and a magnetic circuit is formed by the core to form a deflection magnetic field of a cathode ray tube, wherein the core is a plane passing through a central axis. It is formed by combining the divided first and second cores of the same shape, the coil bobbin holds the core so as to surround a predetermined position of the coil bobbin, and the coil bobbin is at least based on the central axis. 1
By arranging a pair of elastic pieces so as to face each other and pressing the inner surface of the core held at the predetermined position by the elastic pieces, the central axis of the core and the central axis of the coil bobbin substantially coincide with each other. A deflection yoke, characterized in that the core is positioned in the. 2. The coil bobbin forms a curved surface of a funnel curve along an inner surface of the core, and holds the core at the predetermined position so that the curved surface of the funnel curve is surrounded by the core. The deflection yoke according to claim 1, wherein an elastic piece is formed on the curved surface of the funnel curve. 3. The coil bobbin includes a positioning member for positioning the upper end surface of the core, a collar formed so as to face the lower end surface of the core so as to face the positioning member, and an upper portion of the collar. Has a slender rib that gradually rises toward the positioning member, and when holding the core, by scraping off the rib with the core to hold the core at the predetermined position, the dispersion of the core is reduced. The deflection yoke according to claim 1 or 2, wherein the deflection yoke absorbs the core and presses the core against the positioning member to hold the core.