JPS63155540A - Deflection coil and its manufacture - Google Patents

Abstract

PURPOSE:To maintain a constant quality and minimize dispersion by conducting a winding with a main coil part guided by a guide means as well as position controlling a corner in bend parts in front and in rear by a corner pin. CONSTITUTION:Main coil parts 41 are composed of part-windings by guide plates 36 or bobbins for a section dividing. And a stable maintaining of an coiling accuracy is available as well as a high quality coiling of the part is practicable. And an imbalance in left and right can be corrected by controlling the imbalance by a corner pin 37, as a winding direction of wire rods is fixed in bend parts 42 and 43 though the imbalance in right and left is apt to arise. And a corner part of bend parts 42 and 43 maintains its shape by a self welding. This enables a deflection coil 40 having a high accuracy and stable characteristic to be obtained.

Description

[Detailed description of the invention]

[Field of industrial application] The present invention relates to a deflection coil for a cathode ray tube (CRT), and in particular, it is mainly responsible for the scanning deflection of a CR king, and in color OR'I, it is responsible for the function of concentrating three electron beams. The present invention relates to a deflection coil used in a deflection device.

[Summary of the invention]

The present invention relates to a deflection coil in which the positions of the corners of front and rear bend parts are regulated by corner pins, and a main coil part having an axial component is mounted while being guided by a guide means, and a method for manufacturing the same. In particular, the present invention relates to a deflection coil that has highly accurate reproducibility and can provide stable characteristics and quality, and a method for manufacturing the same.

[Conventional technology The electron beam of the book is focused. If the accuracy of this deflection yoke is poor, the image will be distorted, and the variation in east-center error from the design center of the three-color electron beam will increase. Therefore, high definition In the case of a degree CRT,
The accuracy of the deflection yoke becomes extremely important. In particular, it is important to properly wind the main coil that generates the magnetic field that has an influence on the electron beam.
This is extremely important for accuracy. Therefore, as disclosed in, for example, Japanese Utility Model Publication No. 57-60211, the main coil portion is divided into sections by winding a wire into the groove of a bobbin made of a synthetic resin molded body. [Problems to be Solved by the Invention] As described above, in a deflection coil in which the main coil portion is constructed from sections using a bobbin, the direction in which the wire is wound with respect to the groove of the bobbin is constant, so the direction in which the coil is wound is This causes an imbalance in the position of the coil between the winding direction and the unwinding direction. This causes left-right imbalance at the corners of the front and rear bends. This causes the coil to appear twisted. The characteristics of such a deflection coil are
Although it is possible to solve the problem to a certain degree using software methods, it is difficult to solve the problem fundamentally. In order to eliminate such drawbacks, bins are provided at positions corresponding to the opening and rear end corner of the coil of the mold in which the deflection coil is wound, and the position of the winding is regulated by the bins. Attempts are being made to improve accuracy. With this method, the position can be controlled by the bin at the front and rear ends, so the imbalance at these positions can be resolved, but the middle part that provides the maximum magnetic field, that is, the main coil part, is located at the bin position layer. It is difficult to be affected by L11, and this has the disadvantage of causing variations in the characteristics of the main coil section. The present invention was made in view of these problems, and by winding the main coil section, which provides the maximum magnetic field, and the front and rear bend sections, the winding is performed by dividing the winding section. The purpose of this invention is to provide a deflection coil with a small amount of deflection. Means for Solving Problem K Σ The present invention provides a method for manufacturing a deflection coil in which a wire is wound in a saddle shape, and a main coil portion having an axial component is connected by front and rear bend portions. The present invention relates to a deflection coil in which the positions of the corners of the front and rear bend portions are regulated by corner pins, and winding is performed while the main coil portion is guided by a guide means, and to a manufacturing method thereof. ] Therefore maximum! The main coil portion that provides the i-field is divided and wound by the guide means, and the front and rear bend portions are wound with their positions regulated by the corner pins. Therefore, it is possible to improve the accuracy of the overall winding of the coil and to eliminate variations thereof.

【Example】

FIG. 6 shows a winding machine for manufacturing the deflection coil according to this embodiment, and this winding machine is constructed in a four-axis type. The winding machine includes a head 10, and a mold 11 is held in the head 10. And mold 1
The head 10 holding the metal mold 1 is rotated by an arm 12, and the base end of the arm 12 is connected to a mold rotation motor 13. A wire supply section 14 is provided above the motor 13, and a counter 15 is attached to the supply section 14 to count the amount of wire supplied. A fly ~716 is disposed below the mold 11 supported by the head 10, and is connected to the movable table 1 via the arm 17.
It is supported by 8. The arm 17 is rotated simultaneously by a motor 19, and the moving table 18
is adapted to move on the base 20 in the X-axis direction by a feed screw 21. Furthermore, the base 20 has a feed screw 2.
2 on the base 23 in the Y-axis direction. Moreover, a press mold 24 is provided on the upper part of the mold 11.
is provided and is operated by a cylinder 25. In such a winding machine, the flyer 16 winds the wire into the mold 11.
1 is rotated through the 7-m 12, the wire rod is wound into the groove of the mold. The flyer 16 is moved in the X and Y directions by feed screws 21 and 22 to regulate the position of the wire. When the wire is wound around the groove of the mold 11, the cylinder 2
5, the press mold 24 is lowered to press-form the deflection coil, thereby obtaining the deflection coil. Next, the structure of the mold 11 for winding the deflection coil will be explained with reference to FIGS. 1 to 4.
is composed of a concave mold 31 and a convex mold 32. A protrusion 33 is formed at the lower part of the convex mold 32 as shown in FIG. 3, and this protrusion 33 is received in the groove 34 of the concave mold 31. Further, the convex mold 32 has a concave portion 35 formed in the middle portion thereof in the length direction. A plurality of guide plates 36 are provided inside the concave mold 31 in correspondence with the concave portions 35 of the convex mold 32. In addition, corner pins 37 are provided at the front and rear ends of the concave mold 31, respectively.
is provided. The protrusion and retraction of these corner pins 37 is controlled by a plunger 38. As described above, the mold for winding the deflection coil according to this embodiment has a recess 35 in the middle of the convex mold 32, and a guide plate 36 is provided in the concave mold 31 corresponding to the recess 35. is provided, and the wire rod is dividedly wound here accurately and stably. Note that instead of providing the guide plate 36 corresponding to the recess 35 of the convex mold 32, a bobbin made of a synthetic resin molded body for section division may be arranged in the middle of the concave mold 31. By using such a guide plate 36 or a bobbin for section division, the main coil section 41 having an axial component of the CRT is composed of divided windings as shown in FIG. It becomes possible to perform this with high precision, and also to stably maintain that precision, resulting in a deflection coil 40 that exhibits stable characteristics with reproducibility. Further, in this mold 11, corner pins 37 are provided at the front and rear of the concave mold 32, respectively, so as to be freely protrusive and retractable. Then, the plunger 38 causes the corner pin 37 to protrude at a predetermined timing according to the number of windings counted by the counter 15 of the winding machine shown in FIG. 43
will be properly regulated. In particular, in the bend portions 42 and 43, since the winding direction of the wire is constant, unbalance between the left and right tends to occur, but by controlling this with the corner pin 37, it becomes possible to correct the unbalance between the left and right. . The corner portions of the bend portions 42 and 43 maintain their shape by self-fusion. The deflection coil 40 wound with such a mold 11 is characterized in that the front and rear bend portions 42 and 43 and the intermediate portion 41 are divided, and the number of divisions can be selected freely to some extent. There is. Such a deflection coil 40 is connected to the main coil section 4 as described above.
1 into divided windings using the guide plate 36, it is possible not only to reduce variations in the magnetic field in the portion where the peak magnetic field is formed, but also to reduce the imbalance between the left and right sides of the bend portions 42 and 43 using the corner pins 37. It becomes possible to eliminate it. Furthermore, after the wire is wound with the mold 11, the press mold 24 performs forming, thereby improving precision. In particular, since the bend portions 42 and 43 are also formed and self-absorbing, polishing is further improved. In addition, it becomes possible to cover the vacancies of the section method, which requires few adjustment points by determining the characteristics. Effects of the Invention Therefore, it is possible to provide a deflection coil with highly accurate and stable characteristics, and by using such a method of manufacturing a coil, it is possible to improve the reproducibility of the characteristics and to reduce variations.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a winding mold used for manufacturing a coil according to an integrated embodiment of the present invention, and FIG. 2 is a front view of the same concave mold.
Figure 3 is an external perspective view of the convex mold, Figure 4 is a plan view of the assembled mold, Figure 5 is a plan view of the deflection coil raised up, and Figure 6 is the main components of the winding machine. FIG. In addition, in the symbols used in the drawings, 31... Concave 32... Convex 35... Concave portion 36... Guide plate 37... Corner pin 38... Plunger 41... Main coil portion 42... - Front bend portion 43...This is a rear bend portion.

Claims (1)

[Claims] 1. In a deflection coil in which a main coil portion having an axial component is connected by front and rear bend portions, the main coil portion is made up of a plurality of sections formed with a predetermined gap between each other. What is claimed is: 1. A deflection coil characterized in that the corners of the front and rear bend portions are positionally regulated by corner pins, and the entire body is tightly bonded to maintain its shape by self-fusion. 2. In a method for manufacturing a deflection coil in which a wire is wound in a saddle shape and a main coil portion having an axial component is connected by front and rear bend portions, the corners of the front and rear bend portions are connected by corner pins. A method for manufacturing a deflection coil, characterized in that the winding is performed while the main coil portion is guided by a guide means.