JPH021847Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a high-frequency coil in which a relatively thick conducting wire is wound, and provides a high-frequency coil with good workability using a conducting wire without insulation coating.

Conventionally, this type of high-frequency coil for winding relatively thick conductor wire uses a hollow bobbin, and the base is provided with through holes for inserting the winding start and winding ends of the coil. Using a resin-coated conductor, first insert the tip of the conductor into the through hole in the base, bend it horizontally, and then
Wind the wire by rotating the hollow bobbin a specified number of times, bend it downward at a right angle while holding it at the end of the winding, cut the wire to an appropriate length, and then insert the end into the other through hole in the base section. In this method, a terminal is pulled and cut into a specified size, and then the terminal portion is immersed in a molten solder bath to melt the insulating coating and at the same time coat the terminal with solder. In this case, a synthetic resin such as polyurethane is used for the insulation coating, but in order to melt it and apply the solder coating, it must be heated to a high temperature of approximately 400℃, which is different from the temperature for soldering ordinary printed wiring boards. If the coating is not sufficiently melted, the bobbin base may be heated up by the high heat and the bobbin may be deformed. Also, as mentioned above, during the winding process, the end of the winding is held down so that it does not unravel, the conductor is cut, the tip is inserted into the through hole of the bobbin base, and the wire is guided to the bottom of the bobbin base. The work of pulling the wires had the disadvantage of loosening the windings and poor workability.

The present invention was devised to eliminate these drawbacks, and will be explained with reference to the drawings. Fig. 1 is a top view of the bobbin of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a bottom view thereof, Fig. 4 is a side view of the high frequency coil of the present invention, and Fig. 5 is the opposing surface thereof. In the figure, which is a side view of the bobbin, 1 is a hollow bobbin made of synthetic resin, 2 is its hollow part, and 3 is its numerous ribs. Reference numeral 4 denotes a base portion at the bottom thereof, which has a through hole 5 into which the winding start end is inserted.
A notch 6 is provided on one part of the outer periphery of the large number of collars 3 to allow the conductive wire to move into the groove during winding, and a protrusion 7 is provided on the other part. The base portion 4 also has an extending portion 8 that is slightly shifted from the protruding portion 7 of the collar 3 and partially overlaps with the protruding portion 7, and this is provided with a groove 9 extending in the circumferential direction. These protruding portions 7 and extending portions 8 are arranged in a positional relationship such that a portion corresponding to the thickness of the conducting wire 10 is left at the end of the circumferential cut groove 9, and then the protruding portions 7 overlap. There is.

Next, a method for manufacturing a high frequency coil using the above bobbin will be described. First, the tip of a relatively thick uncoated conductor wire or a solder-plated conductor wire 10 is inserted into the through hole 5 of the base portion 4, and this is used as a terminal at the beginning of winding. Next, while rotating the main body of the bobbin 1, the conductive wire 10 is wound once at a time into the winding groove between the collars 3, and the winding groove is shifted at the cutout portion 6.
Finally, at the end of the winding, the conductive wire 10 is hooked to the edge of the protruding portion 7, bent vertically downward, guided near the base portion 4, and inserted laterally into the circumferential groove 9. Then, the excess wire is cut to a specified length as a terminal.

Since this project has the above-mentioned structure and manufacturing method, first of all, only one conductor exists in the winding groove between the flanges, and the winding groove transfer is performed between the wide notches, and the end of the winding is placed in the bobbin outer peripheral protrusion. Since the wires are guided along the outer circumference of the hanging bobbin to the base of the bobbin, there are no points where the wires come into contact with each other, even if the wires do not have insulation coating, so there is no danger of shoots, and there is no need to immerse the wires in a high temperature solder bath in the subsequent process. Therefore, the base portion of the synthetic resin bobbin will not be damaged or deformed at all. In addition, since the end of the first winding is hung on the protrusion on the outer periphery of the collar and bent downward at right angles, there is no need to worry about the coil loosening, and there is no need to insert the end into the through-hole in the base, which is difficult to do from the side. All you have to do is slide it into the groove in the circumferential direction. The present invention has great practical effects as described below.

[Brief explanation of the drawing]

Figure 1 is a top view of the bobbin of the present invention, Figure 2 is a side view thereof, Figure 3 is a bottom view thereof, Figure 4 is a side view of the high frequency coil of the present invention, and Figure 5 is the opposite side view. FIG. DESCRIPTION OF SYMBOLS 1...Hollow bobbin, 2...Hollow part, 3...Brim, 4...Base part, 5...Through hole, 6...Notch part, 7...Protrusion part, 8...Extending part, 9 ...kerf, 10...conductor.

Claims (1)

[Scope of utility model registration request] In a high-frequency coil in which a relatively thick conducting wire is wound around a hollow bobbin, and the terminals thereof are used as terminals for mounting on a board, the hollow bobbin 1 has a large number of ribs 3, and a part of the outer circumference of the ribs 3 has a circumference of 4. A wide notch part 6 of less than 1/2 and a protrusion part 7 is provided in the other part,
Further, the lower end of the hollow bobbin 1 is used as a base part 4, and a through hole 5 into which the coil conductor 10 is inserted is provided, and an extending part 8 is provided on a part of its outer periphery.
A cut groove 9 having a width approximately equal to the thickness of the conductor 10 is provided in the circumferential direction from the edge of the conductor 10, and the extension portion 8 and the protrusion 7 are placed in a positional relationship in which they partially overlap. The winding start end of is inserted into the through hole 5 to serve as a terminal, the hollow bobbin 1 is rotated to wind once in the winding groove between each collar 3, each winding groove transition is performed at the cutout part 6, and the winding ends. A high-frequency coil characterized in that a portion of the coil is hooked onto the edge of the protruding portion 7, bent downward at right angles, and then introduced laterally into the cut groove 9 of the base portion 4.