JPH0279341A - Deflecting coil and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to eliminate the need for adjusting a deflecting coil by mutually arranging plural coil units of different sizes in their size- sequential overlapping relation, and then connecting them together in series. CONSTITUTION:Plural coil units 18, 18', 18'', 22'', 22', 22 (18 to 22) of respectively different sizes are prepared by, for example, winding laminar conductors in loop shapes while insulating them from each other. Respective coil units, 18 to 22 are sequentially overlapped and arranged according to their sizes. Subsequently, the arranged units are pressed and formed so as to be adapted to, for example, the cone curve of a cathode-ray tube, with the coil units, 18 to 22 ultimately connected in series, in order to complete the manufacture of a deflecting coil 36. The possibility of causing unevenness in manufactured coils is thus lessened since each of the coil units, 18 to 22 is formed beforehand into a unit for making it unnecessary to individually adjust the coils.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deflection coil and a method for manufacturing the same, and more particularly to a deflection coil for a CRT such as a cathode ray tube of a television and a method for manufacturing the same.

[Prior art]

One method of conventional deflection coils is to wind a self-welding insulated copper wire in a toroidal shape around a rabbet-shaped core, as is well known from, for example, Japanese Patent Application Laid-open No. 58-135550. It is formed by

In another method, the deflection coil is formed by using a flanged bobbin and winding an insulated conductive wire in a continuous manner in each of a plurality of coil sections.

[Problem to be solved by the invention]

In the case of the former method, variations occur in the winding position and number of turns, resulting in large individual differences in deflection magnetic flux, and it is necessary to make individual adjustments by adding correction coils, magnets, etc. after assembly.

On the other hand, when using the latter method, unlike the case of direct winding, although variations in the winding position and number of turns are improved,
This resulted in overturns and hack turns in which the position of the windings within each section varied vertically, so individual adjustments were unavoidable.

Therefore, the main object of the present invention is to provide a deflection coil and a method for manufacturing the same, which allows adjustment-free deflection.

[Means to solve the problem]

The first invention is a deflection coil that includes a plurality of coil units of different sizes, which are arranged one on top of the other in order according to their sizes, and are connected in series.

The second invention includes (a) preparing a plurality of coil units of different sizes, (b) arranging the plurality of coil units one on top of the other in order according to their sizes, and (c) stacking each coil unit. A method of manufacturing a deflection coil, including the step of serially connecting the deflection coil.

[Effect]

For example, a plurality of coil units of different sizes are prepared by winding a plate-shaped conductor while insulating it. The coil units are arranged one on top of the other in order according to their sizes. Then, it is press-molded to match, for example, the cone curve of a cathode ray tube, and finally, each coil unit is connected in series to complete the deflection coil.

(Effect of the invention) =3- According to this invention, since the coils are unitized in advance, there is little possibility that variations will occur as in the conventional case.
Therefore, it is no longer necessary to make individual adjustments, which were unavoidable in the past. Therefore, according to the present invention, the workability of incorporating the deflection coil can be dramatically improved, and a significant cost reduction can be expected.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

〔Example〕

First, in order to make a coil unit, as shown in FIG.
A long sheet 10 with a length of 0 m is prepared. This sheet 10 includes a copper foil 12 having a thickness of, for example, 30 to 300 μm, and an insulating sheet 1 having a heat-weldability and having a thickness of, for example, 10 to 30 μm.
4 are pasted together. This sheet 10 is used as a winding core (
(not shown), for example, to make an irregularly shaped cylindrical body.

FIGS. 3(A) and 3(B) are a front view and a side view showing an example of this cylindrical body. The cylinder 16 shown in FIG. 3 is formed into a hollow trapezoidal shape wound around a core having a trapezoidal cross section.

After winding the sheet 10 a predetermined number of times, it is heated and preliminary thermal welding is performed to prevent loosening in the subsequent cutting and pressing process. Thereafter, the cylinder 16 is pulled out from the core.

The cylindrical body 16 shown in FIGS. 3A and 3B is then sliced into rings having a width of, for example, 1 to 3 mm, depending on the required current capacity, as shown in FIG.

At this time, the winding start portion 12a and winding end portion 12b of the copper foil 12 are separated from the insulating sheet 14. The winding start part 12a and the winding end part 12b will later become connection parts for connecting the coil units. In this way, a small coil unit 18 as shown in FIGS. 4(A) and 4(B) is obtained. This small coil unit 1
Day is the innermost coil unit in FIG. 1(B).

Following a similar method, from the cylinder 20 shown in FIG.
A large coil unit 2 with an approximately egg-shaped cross section as shown in FIG.
2 is obtained. This large coil unit 22 is shown in FIG.
) is used as the outermost coil unit.

In addition, although the manufacturing method of the remaining coil units 1B', 18'' and 22', 22'' arranged between the coil units 18 and 22 in FIG. 1 is omitted, these coil units 18', 18'' and Of course, 22' and 22'' are also prepared in advance in the required size and shape.

Next, the small coil unit 18 is press-molded into the shape shown in FIG. 7, for example, in accordance with the cone curve of the neck of the cathode ray tube. That is, the small coil unit 18 has parallel parts 2 bent near both ends and facing each other.
4 and 26, and the parallel parts 24 and 2
A curved portion 28 is formed between the portions 6 and 6. The curved portion 28 follows the cone curve of the cathode ray tube.

The large coil unit 22 is also press-molded to have parallel parts 30 and 32 and a curved part 34, as shown in FIG. 8, for example.

The small coil units 18 and 22 press-molded into the shapes shown in FIGS. 7 and 8 are finally heat-welded with their respective insulating sheets.

This is another coil unit 1 that was press-molded in the same way.
The same applies to B', 18'', 22' and 22''.

In this way, six coil units 18.18', 18'', 22'', 22' and 22, each having a different size, are prepared, and these coil units are arranged concentrically in this order as shown in FIG. It is placed according to the At this time,
Although not shown, the arrangement of the coil units 18 to 22 can be performed more accurately and easily by using a groove, a guide bin, and a cone-shaped bobbin for each coil unit.

Then, the winding start part 12a and winding end part 12b of each coil unit 18-22 shown in FIG. 4(B) and FIG. 6(B) are connected to each other.
Connect electrically so that they are in series. In implementation, a pair of left and right deflection coils 36 are arranged on the neck (not shown) of the cathode ray tube, and the deflection coils 36 are divided into left and right sides to deflect the electron beam.

According to the deflection coil 36 shown in FIG. 1, the coil units 18 to 22 are arranged radially with respect to the central axis of the cathode ray tube, so that the magnetic field is uniform and its reproducibility is extremely high. Therefore, it may become possible to omit individual adjustments after implementation. Furthermore, the shape of each coil unit can be easily controlled during winding and press molding according to the required magnetic field distribution.

Furthermore, in addition to preparing each coil unit,
Its assembly can also be done by automatic machines, so
In this case, significant simplification would be possible.

In addition, in the above embodiment, as shown in FIG. 4(B) or FIG. 6(B), for example, the coil unit 1B (18') is connected to the cylindrical body 16 or 20.

18'') or 22 (22', 22''), the cut surfaces may be coated with insulating paint or dipped in resin.

Further, in the above-described embodiment, a heat-weldable material was used as the insulating sheet 14, but it may be an adhesive insulating sheet.

Further, in the above embodiment, six coil units are stacked to form one deflection coil 36.
The number of overlapping coil units may be greater or less than that.

Although the embodiment described the horizontal deflection coil,
It goes without saying that the same applies to vertical deflection coils. Moreover, it can be used not only for cathode ray tubes but also as deflection coils for image pickup tubes and viewfinders.

[Brief explanation of the drawing]

FIG. 1 is an illustrative diagram showing one embodiment of the present invention.
FIG. 1(A) is a side view, and FIG. 1(B) is a partially omitted plan view. FIG. 2 is a perspective view of a sheet used to prepare a coil unit. FIG. 3 is an illustrative view showing an example of a cylindrical body formed by the sheet shown in FIG. 2, and FIG. 3(A) is a front view thereof;
FIG. 3(B) is a side view. FIG. 4 is an illustrative view showing a small coil unit formed by cutting the cylinder shown in FIG. 3 into rings, FIG. 4(A) is a front view thereof, and FIG. 4(B) is a side view thereof . FIG. 5 is an illustrative view showing another example of a cylindrical body formed from the sheet shown in FIG. 2, with FIG. 5(A) being a front view thereof and FIG. 5(B) being a side view thereof. FIG. 6 is an illustrative view showing a large coil unit formed by cutting the cylinder shown in FIG. 5 into rings, FIG. 6(A) is a front view thereof, and FIG. 6(B) is a side view thereof. . FIG. 7 is an illustrative view showing a press-molded state of the small coil unit shown in FIG. 4, FIG. 7(A) is a side view thereof, and FIG. 7(B) is a partially omitted plan view thereof. FIG. 8 is an illustrative view showing the state in which the large coil unit shown in FIG. 6 is press-molded, FIG. 8(A) is a side view thereof, and FIG. 8(B) is a partially omitted plan view. In the figure, 10 is a sheet, 12 is a copper foil, 12a is a winding start part, 12b is a winding end part, 14 is an insulating sheet, 1
6.20 is a cylinder, 18 (1B'. 18") is a small coil unit, 22 (22', 22")
) indicates a large coil unit, and 36 indicates a deflection coil. Patent applicant Murata Manufacturing Co., Ltd. Representative Patent attorney Yama 1) Yoshihito-1-1 ~ 1-1! 21 Ward\Saiyabu Figure 7 (A) Me 0 1. , PA CB) RIRO (A) (B)

Claims (1)

[Scope of Claims] 1. A deflection coil comprising a plurality of coil units of different sizes, the plurality of coil units being arranged one on top of the other in order according to their sizes, and connected in series. 2. The deflection coil according to claim 1, further comprising a bobbin for arranging the plurality of coil units. 3 (a) preparing a plurality of coil units each having a different size; (b) arranging the plurality of coil units one on top of the other in order according to their sizes; and (c) connecting each coil unit in series. A method of manufacturing a deflection coil, comprising the steps. 4. The method of manufacturing a deflection coil according to claim 3, wherein step (a) includes the step of (a-i) forming a coil unit by winding plate-shaped conductors while insulating them from each other. 5. The method of manufacturing a deflection coil according to claim 4, wherein step (a-i) includes the step of winding an insulating sheet on which a conductor is formed. 6. In step (a-i), an insulating sheet on which a conductor is formed is wound to form cylinders of different sizes, and each of the cylinders is sliced into rings to form a plurality of coil units of the different sizes. Claim 5 comprising the step
Method of manufacturing the described deflection coil. 7. The method for manufacturing a deflection coil according to claim 3, wherein the step (b) includes the step of arranging the plurality of coil units on a bobbin.