JPS63166128A - Deflecting yoke - Google Patents

Abstract

PURPOSE:To improve deflection efficiency of horizontal coils by winding copper wires so as to be shaped nearly in flat plate frames so that horizontal coils and vertical coils are formed and press-molding these coils semi-cylindrically and combining them and inserting magnetic materials into window parts formed in winding of the vertical coils. CONSTITUTION:Horizontal coils 1 and vertical coils 2 are formed by winding adhesive copper wires so as to be shaped in flat plate frames and they are press-molded semi-cylindrically. The horizontal coils 1 are incorporated inside, and further the vertical coils 2 are assembled outside the coils 1. Then magnetic materials 4 such as a ferrite core and permalloy, which are shaped in circular arcs, are inserted into window parts 2a of the vertical coils 2. A shield plate 3 is wound on the outermost periphery. Since such compostion allows inductance L of the horizontal coils 1 to be increased and their series resistance R to be unchanged, a L/R ratio becomes large so that deflection efficiency of the horizontal coils 1 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a deflection yoke used in electronic viewfinders of video cameras and the like.

2. Description of the Related Art A conventional general deflection yoke is constructed as shown in the sectional view of FIG. In FIG. 3, 11 is a horizontal coil wound into a saddle shape using copper wire having an adhesive layer, and 12 is a vertical coil, which is toroidally wound around a cylindrical ferrite core 13.

On the other hand, recent small and lightweight video cameras use a small deflection yoke for electronic viewfinders that does not use a ferrite core, as shown in FIG. In FIG. 4, both the horizontal coil 21 and the vertical coil 22 are wound with copper wire having an adhesive layer into a perforated rectangular plate shape and press-molded into a semi-cylindrical shape. An exterior shield plate 23 made of permalloy is attached to its outer periphery in place of the ferrite core to improve deflection efficiency. Therefore, it is more compact and lighter than a conventional deflection yoke using a cylindrical ferrite core 13.

Problems to be Solved by the Invention As video cameras become smaller and lighter in the future, a deflection yoke that does not use a ferrite core is desired to be smaller and have better deflection efficiency. However, it has not been easy to make the coil itself smaller because it impairs the deflection efficiency.

Means to Solve the Problems In order to solve the above problems, the present invention provides horizontal coils and vertical coils formed into semi-cylindrical shapes. In this case, a magnetic body is inserted into the winding window frame portion of the vertical coil.

Effects According to the present invention, with the above-described configuration, the inductance of the horizontal coil is increased by the magnetic material in the center of the vertical coil, and the DC resistance of the horizontal coil remains unchanged, so that the L/R ratio increases and the deflection efficiency of the horizontal coil increases. improves. However, the efficiency of the vertical coil decreases slightly due to the shielding effect, but overall the deflection efficiency improves.

Embodiment FIG. 1 is a cross-sectional structural diagram showing an embodiment of the present invention. FIG. 2 is an exploded perspective view of the same. Figure 1.

In FIG. 2, reference numeral 1 denotes a horizontal coil, which is made by winding a copper wire with an adhesive layer into a flat frame shape and press-molding it into a semi-cylindrical shape. 2 is a vertical coil which is similarly wound into a flat frame shape and press-molded into a semi-cylindrical shape. A horizontal coil 1 is combined on the inside, a vertical coil 2 is combined on the outside, a magnetic material 4 such as an arc-shaped ferrite core or permalloy is inserted into the window 2a of the vertical coil 2, and a shield plate 3 ( It is constructed by winding a permalloy plate (approximately 0.01 mm thick). Although the magnetic body 4 inserted into the window portion 2a is a ferrite core piece in this embodiment, the same effect can be obtained by using a resin molded product containing ferrite powder, a permalloy plate, an amorphous plate, or the like.

Effects of the Invention As described above, according to the present invention, it is possible to increase the deflection efficiency without increasing the external size of the deflection yoke, and it is particularly useful for improving the deflection efficiency or downsizing the deflection yoke. Also, in the conventional structure, the shield plate is thin, so
If the vertical coil window part is pressed from the outside with a finger, the shield plate easily deforms and care must be taken when mounting the set, but in the present invention, a magnetic material is inserted into the vertical coil window frame part. Since there is no cavity and there is no deformation of the shield plate, not only stable performance can be maintained, but also a shield plate with a higher nitrogen density can be used and the weight can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the deflection yoke of the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a sectional view of a conventional deflection yoke using a ferrite core, and FIG. FIG. 3 is a cross-sectional view of a small deflection yoke that does not use a ferrite core. 1... Horizontal coil, 2... Vertical coil, 2a... Window section, 3... Shield plate,
4...Magnetic material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] Both the horizontal coil and the vertical coil are constructed by winding copper wire with an adhesive layer into a roughly flat frame shape, press-forming it into a semi-cylindrical shape, and combining them, and inserting a magnetic material into the window of the winding of the vertical coil. deflection yoke.