JP3922775B2 - Molding device for deflection yoke - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deflection yoke used by being mounted on a cathode ray tube of a television receiver, a display device or the like, and in particular, a deflection yoke mold used for manufacturing a bobbin which is a main component of the deflection yoke. Relates to the device.
[0002]
[Prior art]
Generally, there are roughly two types of deflection coils used in a cathode ray tube of a video display device such as a television receiver. The deflection coil and the toroidal deflection coil are divided into molds. The type can be divided into the type that is produced by using and the type that is directly formed on the bobbin or core (magnetic core).
[0003]
In recent years, in particular, deflection yoke devices for terminal display devices and consumer-use large-sized television receivers have been widely used in which a bobbin is directly wound to form a rectangular deflection coil in order to improve image quality. Have been doing. Therefore, with the demand for such a prismatic deflection coil, it is desired to reduce the manufacturing cost and simplify the manufacturing process of the entire prismatic deflection coil.
[0004]
Usually, the trapezoidal deflection coil has a hollow bobbin that gradually spreads from the neck portion of the cathode ray tube toward the screen side, and the first region of the inner surface of the bobbin on the screen side faces the neck portion direction. A plurality of ribs are formed. A plurality of groove portions are formed between the plurality of ribs, and an electric wire (formed as a deflection coil) is wound around the plurality of groove portions by a predetermined number of turns. Thereby, the electric wire is configured as upper and lower saddle-shaped deflection coils.
[0005]
Such a bobbin is generally called a slit-type bobbin. As an example of a manufacturing method thereof, for example, a non-magnetic material such as polypropylene is subjected to a heating and pressing process using a mold apparatus, thereby forming a slit type. There is a mold manufacturing method formed with a bobbin. The mold manufacturing method is a conventional manufacturing method, and has an advantage that mass production is possible at low cost.
[0006]
FIG. 4 is a structural perspective view showing an example of a deflection coil mold apparatus necessary for manufacturing the slit type bobbin of the above-mentioned rectangular deflection coil.
[0007]
As shown in FIG. 4, the slit-type bobbin, which is a main component of the prismatic deflection coil, is manufactured by using a deflection yoke mold apparatus 1. This deflection yoke mold apparatus 1 A predetermined number of rib forming grooves 2 for forming a plurality of ribs of the slit type bobbin are formed on the outer peripheral surface of the main body. Further, a predetermined number of winding groove forming projections 3 necessary for winding a wire constituting a vertical deflection coil or a horizontal deflection coil are formed between the rib forming groove portions 2. Yes.
[0008]
Usually, in the slit type bobbin, a non-magnetic material such as polypropylene is used, and the positions and shapes of the plurality of grooves formed between the plurality of ribs around which the electric wire (coil) is wound are It is designed so that deflection yoke performance (particularly convergence performance) is the best in relation to the number. Therefore, the rib forming groove 2 and the winding groove forming protrusion 3 are accurately positioned so as to form a slit-type bobbin based on such a design.
[0009]
When a slit type bobbin is manufactured using the deflection yoke mold apparatus 1 having the above-described configuration, for example, another mold apparatus having a shape corresponding to the deflection yoke mold apparatus 1 is prepared, and these deflection apparatuses are prepared. The yoke mold apparatus is installed in a device that performs heat and pressure processing, and then a non-magnetic material that is a member of the slit type bobbin is sandwiched, and at the same time, heat and pressure processing is performed using the device, thereby forming a trumpet shape. A slit-type bobbin having a plurality of ribs and a plurality of grooves formed on the outer peripheral surface is formed.
[0010]
After that, the manufactured slit type bobbin is installed inside, and the electric wire is wound between the plurality of ribs in a state where, for example, a ferrite core is sandwiched between the slit type, the bobbin, and the separately manufactured outer bobbin. Thus, a deflection yoke can be formed.
[0011]
By the way, with the recent diversification of video display devices, it is desired that the performance of the deflection yoke mounted on the cathode ray tube be correspondingly changed, and this causes a design change in the rib shape that greatly affects the deflection yoke performance. It is also possible to do. However, since the conventional deflection yoke mold apparatus 1 as described above is a completed mold apparatus, such a design change cannot be made. Therefore, when a design change is necessary as described above, it is necessary to newly make a mold apparatus having a rib shape based on the design change. For this reason, since the newly created die apparatus 1 for a deflecting device occupies a ratio of approximately 1/3 to 1/2 of the entire mold including other mold apparatuses, as a result, There has been a problem that the design change involves a large burden along with the cost and the production delivery date.
[0012]
[Problems to be solved by the invention]
As described above, in the conventional deflection yoke mold apparatus, when it becomes necessary to change the design of the rib shape, which greatly affects the deflection yoke performance, due to the diversification of the image display apparatus, the design of the mold itself is designed. Since the change is impossible, a new deflection yoke mold apparatus is inevitably created based on the design change, and as a result, there is a problem that a large burden is accompanied with cost and manufacturing delivery time.
[0013]
Therefore, the present invention was made in view of the above problems, and by making it a structure that can cope with the design change of the rib shape, the new creation of the mold device accompanying the design change is suppressed to the minimum necessary, It is an object of the present invention to provide a deflection yoke mold apparatus capable of greatly reducing manufacturing costs and manufacturing delivery times.
[0014]
[Means for Solving the Problems]
The deflection yoke mold apparatus of the present invention is a component part of a deflection yoke attached to a cathode ray tube, and is formed in a shape that gradually widens from the neck portion of the cathode ray tube toward the screen direction, and the inner peripheral surface thereof is a neck portion. Deflection yoke die required for molding a slit type bobbin having a plurality of ribs formed in a direction and a winding groove for winding a deflection coil formed between the plurality of ribs In the apparatus, a plurality of rib forming groove portions for forming the plurality of ribs formed on the outer peripheral portion of the mold apparatus main body, and provided between the rib forming groove portions, and molding the winding groove portion. A plurality of winding groove forming protrusions, and when changing the design of each shape of the rib and the winding groove portion, it is attached to at least a partial region of the outer peripheral portion of the mold body, Outside And a rib changing attachment member formed so that a peripheral portion is formed with a rib shape based on a design change and a winding groove portion.
[0015]
In the present invention, by using a deflection yoke die device having a shape including the plurality of rib forming grooves and the winding groove forming protrusions, the cathode ray tube gradually moves from the neck portion toward the screen. A plurality of ribs whose inner peripheral surface is formed toward the neck portion direction and a winding groove portion for winding a deflection coil formed between the plurality of ribs are formed while being formed in an expanding shape. A slit type bobbin can be molded. After that, assuming that the design change of the rib shape of the slit type bobbin to be molded has occurred, in this case, the slit that satisfies the design change requirement by attaching the rib changing mounting member to the mold apparatus main body and molding it. A mold bobbin can be manufactured. This makes it possible to manufacture slit-type bobbins that satisfy the requirements by creating only the rib changing mounting member without creating a new die body, even if there is a request for rib shape design changes. Costs and manufacturing delivery times can be greatly reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a structural perspective view showing another embodiment of a deflection yoke mold apparatus according to the present invention. In FIG. 1, the same components as those in the apparatus shown in FIG. 4 are denoted by the same reference numerals, and the rib forming attachment member 14 shown in FIG. 1 is enlarged for easy understanding of the configuration. It is shown as
[0018]
As shown in FIG. 1, a deflection coil mold apparatus 11 in this embodiment is provided to cope with a design change of a mold body 12 for manufacturing a slit bobbin and a rib shape of the slit bobbin. And a rib changing attachment member 14 detachably attached to the mold body 12.
[0019]
A predetermined number of rib-forming grooves 2 for forming a plurality of ribs of the slit-type bobbin are formed on the outer peripheral surface of the mold main body 12 as in the conventional mold apparatus (see FIG. 4). In addition, a winding groove forming projection 3 for forming a winding groove necessary for winding an electric wire constituting a vertical deflection coil or a horizontal deflection coil is provided between the rib forming grooves 2. Numbers are to be formed.
[0020]
Therefore, according to such a configuration, when a normal slit type bobbin is manufactured, that is, when it is not necessary to change the design of the rib shape, the mold body 12 having the above shape and the corresponding mold apparatus ( A slit-type bobbin in which a plurality of ribs and a plurality of winding grooves are formed on the outer peripheral surface by subjecting a non-magnetic material such as polypropylene to heat and pressure processing, for example. Is possible.
[0021]
A mounting groove 13 for mounting the rib forming mounting member 14 is formed in a predetermined region of the outer peripheral surface of the mold body 12 in accordance with the design change of the rib shape. That is, when the design change occurs in the rib shape of the slit type bobbin to be manufactured after the mold body 12 is completed, the rib changing mounting member 14 is attached to the mounting groove portion 13.
[0022]
On the other hand, the rib changing attachment member 14 has a shape that gradually expands from the neck portion toward the screen so as to correspond to the outer peripheral surface of the mold main body 12, and on the attachment portion side (inner portion), It is formed in a shape that can be fitted into the mounting groove 13. Further, in the outer portion of the rib changing attachment member 14, a rib forming portion for molding a rib based on the design change with the rib forming groove portion 2 of the adjacent die main body 12 when the mold main body 12 is mounted. 2a is formed. Further, in the vicinity of the center of the outer peripheral surface of the rib changing mounting member 14, a winding groove necessary for winding an electric wire (coil) is formed through a rib formed by the rib forming portion 2a or the like. A winding groove forming portion 3a is formed.
[0023]
The shape of the rib changing attachment portion 14 is not limited to the shape such as the lateral width and depth of the rib forming portion 2a or the height of the winding groove forming portion 3a as shown in the figure. The rib forming portion 2a and the winding groove forming portion 3a may be appropriately changed and molded so as to have a shape necessary for obtaining the deflection yoke performance according to the rib design change.
[0024]
Therefore, in the deflection yoke mold apparatus 11 according to this embodiment, the ribs molded based on the design change in the mounting groove 13 formed in the mold body 12 in order to be able to cope with the design change of the rib shape. If a design change of the rib shape is caused by adopting a nesting structure in which the change mounting member 14 is inserted to form a mold apparatus, the mold main body 12 can be changed to a certain degree of rib shape design change. It is possible to manufacture a slit-type bobbin based on the intended deflection yoke performance by using only the rib changing attachment member 14 while using it as it is without being discarded.
[0025]
FIG. 2 is a structural perspective view showing a modification of the rib changing attachment member 14.
[0026]
As shown in FIG. 2, in this example, in the rib changing attachment member 14 (see FIG. 1), the rib forming portions 2a are formed on both ends of the rib changing attachment member 14, respectively. In the rib changing attachment member 14a of this example, the rib forming portion 2b is formed only on one side. Further, on the other side of the rib forming portion 2b, a winding groove forming portion 3b extends to the attachment portion. For this reason, the number of ribs to be manufactured is the same as in the above embodiment, but the shapes of the ribs and the winding groove are slightly different.
[0027]
In other words, if the mounting member for rib change is manufactured so as to have the desired rib shape and winding groove shape as in this example, the deflection yoke performance can be freely adjusted, not to mention the design change. It becomes possible to do.
[0028]
Now, it is assumed that a slit bobbin is manufactured using the deflection yoke mold apparatus 11 shown in FIG. At this time, if a slit-type bobbin based on the design of the mold apparatus 11 is manufactured, the other mold having a shape corresponding to the mold body 12 of the deflection yoke mold apparatus 11 is used, for example, as in the conventional example. A mold device is prepared, and these deflection yoke mold devices are installed in a device for heat and pressure processing, and then a non-magnetic material as a member of the slit type bobbin is sandwiched, and at the same time, heat is applied using the device. Apply pressure processing. Thus, a slit-type bobbin based on the shape of the mold body 12 designed in advance, that is, a slit-type bobbin in which a plurality of ribs and a plurality of grooves are formed on a trumpet-shaped outer peripheral surface.
[0029]
However, the design of the rib shape of the slit-type bobbin may be changed in order to optimize the deflection yoke performance of the mounted cathode ray tube. In such a case, first, the mold main body 12 is not discarded and is held as it is, while the rib change that can be molded into the rib shape and the winding groove portion shape based on the design change of the rib shape. A new attachment member 14 is created.
[0030]
Thereafter, the completed rib changing mounting member 14 is fitted into the mounting groove 13 of the mold body 12 to form the deflection yoke mold apparatus 11 for changing the rib shape design. In this case, as the rib changing attachment member 14 attached to the mold body 12, for example, an attachment member 14a shown in FIG. 2 may be used according to the rib shape design.
[0031]
Thereafter, by installing the deflection yoke die device 11 in a device that performs heat and pressure processing as described above, and performing heat and pressure processing, as a result, a slit type bobbin based on a design change of the rib shape is obtained. Can be manufactured.
[0032]
After that, the manufactured slit type bobbin is installed inside, and the electric wire is wound between the plurality of ribs in a state where, for example, a ferrite core is sandwiched between the slit type, the bobbin, and the separately manufactured outer bobbin. Thus, a deflection yoke is formed.
[0033]
Therefore, according to the present embodiment, when a change in the design of the rib shape occurs due to a change in the deflection yoke performance of the mounted cathode ray tube, only the rib changing attachment member 14 based on this design change in the rib shape is newly added. By manufacturing, a slit-type bobbin based on a design change of the rib shape can be manufactured. As a result, the mold body 12 can be used as it is without being discarded. Therefore, compared to the conventional deflection yoke mold apparatus, the creation of a new mold apparatus accompanying a design change is suppressed to the minimum necessary. As a result, the manufacturing cost and the manufacturing delivery time can be greatly reduced.
[0034]
FIG. 3 is a structural perspective view showing another embodiment of the deflection yoke mold according to the present invention. In FIG. 3, the same components as those in the apparatus shown in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.
[0035]
In the present embodiment, a plurality of ribs can be manufactured with respect to the rib changing mounting member 14 in order to obtain further deflection yoke performance that is desired or necessary. Accordingly, the width of the mounting groove portion 13 of the mold main body 14 is increased to a size that allows the rib changing mounting member 14 to be fitted, which is different from the above embodiment example. Is a point.
[0036]
Specifically, as shown in FIG. 3, the rib changing attachment member 14b is gradually shaped from the neck portion toward the screen so as to correspond to the outer peripheral surface of the mold body 12a as in the above-described embodiment. The mounting part side (inner part) is also formed in a shape that can be fitted into the mounting groove 13a in the same manner.
[0037]
Further, in the outer portion of the rib changing attachment member 14b of this example, the winding groove forming portions 3c and 3d for forming the wire winding groove are formed in parallel. A rib forming portion 2c for molding a rib is formed between the groove forming portions 3c and 3d. Further, at both ends of the winding groove forming portions 3c and 3d, when the mold main body 12 is mounted, ribs based on the design change are molded with the rib forming groove portions 2 of the adjacent mold main body 12. Rib forming portions 2d and 2e are formed. That is, by using the rib changing attachment member 14b in which the rib forming portions 2c, 2d, 2e and the winding groove forming portions 3c, 3d are formed in this way, the design change of the rib shape can be performed by a single heating and pressing process. It is possible to manufacture a slit type bobbin to which a plurality of ribs and a plurality of wire winding grooves are added.
[0038]
Further, in the mold main body 12a, the width of the mounting groove portion 13a is increased with the shape of the rib changing mounting member 14b. It is formed so that the mounting member 14b can be securely fitted.
[0039]
In this embodiment, a design change of the rib shape occurs, and the deflection yoke performance is adjusted by the rib shape that greatly affects the deflection yoke performance, for example, the number of ribs and the number of wire winding grooves. In order to satisfy this requirement, a rib changing attachment member 14b having a plurality of rib forming portions 2c, 2d, 2e and a plurality of winding groove forming portions 3c, 3d is provided. Create a new one.
[0040]
Thereafter, in the same manner as in the above-described embodiment, if the manufacturing is performed using the deflection yoke mold device 11a formed by fitting the rib changing mounting member 14b formed in the mounting groove portion 13a of the mold main body 12a, the above-described embodiment is performed. It is possible to manufacture a slit-type bobbin to which a plurality of ribs and an electric wire winding groove are added as compared with the embodiment.
[0041]
Therefore, according to the present embodiment example, in addition to the same effects as the above embodiment example, a slit type bobbin in which a plurality of ribs and a wire winding part are added in a single manufacturing process when the design of the rib shape is changed. Therefore, it is possible to cope with any design changes in the rib shape, and the complicated manufacturing process of the mold body 12a can be easily performed. .
[0042]
Further, by implementing the embodiment according to the present invention, a sample of a slit-type bobbin molding die device that has not been manufactured at a high cost in the past can be obtained by using a curved shape of the outer peripheral surface of the die main body 12, a coil If the conditions such as the length are satisfied, it is possible to realize the sample of the slit-type bobbin molding die device at a low cost by replacing only the rib changing mounting member 14.
[0043]
In the present embodiment example, the case where the number of ribs and winding groove portions to be molded is one more than that of the above embodiment example by mounting the rib changing attachment member 14b is described, but the present invention is not limited to this. The rib changing mounting member 14b includes a plurality of rib forming portions and a plurality of winding groove forming portions so that a plurality of ribs and a plurality of winding groove forming portions can be molded according to the design change of the rib shape. May be.
[0044]
【The invention's effect】
As described above, according to the present invention, as a structure that can cope with the design change of the rib shape, it is possible to suppress the creation of a new mold apparatus accompanying the design change to the minimum necessary, and to reduce the manufacturing cost and the manufacturing. The effect that a delivery time can be reduced significantly is acquired.
[Brief description of the drawings]
FIG. 1 is a structural perspective view showing an embodiment of a deflection yoke mold apparatus according to the present invention.
2 is a structural perspective view showing another example of the knob deflection attachment member of FIG. 1. FIG.
FIG. 3 is a structural perspective view of an apparatus showing another embodiment.
FIG. 4 is a structural perspective view showing an example of a conventional deflection yoke mold apparatus.
[Explanation of symbols]
2 ... rib forming groove,
3 ... groove part for winding groove formation,
2a, 2b, 2c, 2d, 2e ... rib forming part,
3a, 3b, 3c, 3d ... winding groove forming part 11 ... deflection yoke mold apparatus,
12 ... Mold body,
13 ... Mounting groove,
14 ... Mounting member for rib change.

Claims (3)

A component part of a deflection yoke attached to the cathode ray tube, which is formed into a shape gradually expanding from the neck portion of the cathode ray tube toward the screen direction, and a plurality of ribs whose inner peripheral surface is formed toward the neck portion direction; In a deflection yoke mold apparatus necessary for molding a slit-type bobbin provided with a winding groove for winding a deflection coil formed between a plurality of ribs,
A plurality of rib-forming grooves formed on the outer peripheral portion of the mold apparatus main body, for molding the plurality of ribs;
A plurality of winding groove forming projections provided between the rib forming grooves, and molding the winding groove;
When the design of each shape of the rib and the winding groove is changed, the rib is attached to at least a part of the outer peripheral portion of the mold body, and the outer peripheral portion is a rib shape and a winding based on the design change. A rib changing attachment member formed to mold the groove;
A mold apparatus for a deflection yoke, comprising: 2. The deflection yoke die according to claim 1, wherein the rib changing attachment member is detachably attached to an attachment groove formed in a part of an outer peripheral portion of the die body. apparatus. The rib changing attachment member is configured in a shape in which a plurality of ribs and a plurality of winding groove portions can be molded according to a design change of each shape of the ribs and the winding groove portions. The deflection yoke mold apparatus according to claim 1 or 2.

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