JPH0458162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high frequency transformer used in various electronic devices.

Conventional configuration and its problems Conventionally, this type of high-frequency transformer is shown in Fig. 1, Fig. 2,
It was constructed as shown in Figures 3 and 4.

That is, the bobbin 2 around which the coil 1 is wound is fitted and fixed to the terminal plate 3.
A core holding molded body 4 was placed over the core holding molded body 4, a core 5 was screwed onto the core holding molded body 4, and a shielding case 6 was further placed over the whole to form a high frequency transformer.

In this case, the bobbin 2 in FIG. 2 and the terminal plate 3 in FIG. 3 are joined together by fitting the wedge-shaped part of the foot 2a of the bobbin 2 into the recess 3a on the side surface of the terminal plate 3, but Due to dimensional variations in the molding of parts, there were cases in which looseness occurred in the connection between the bobbin 2 and the terminal plate 3. In such a case, the vibration from the outside causes the coil 1 wound around the bobbin 2 to
This has the disadvantage that the distance between the core 5 held by the core holding mold body 4 fluctuates, leading to fluctuations in inductance, and reducing the howling phenomenon.

Purpose of the Invention The present invention aims to eliminate such conventional drawbacks, and provides a high frequency transformer configured such that the bonding state of the bobbin and the terminal plate does not easily rattle even if there are variations in molding. The purpose is to

Composition of the Invention In order to achieve this object, the high frequency transformer of the present invention is provided with an acute-angled protrusion projecting outward in the groove-like joint portion on the side of the terminal plate, which is the joint portion with the bobbin.
The foot of the bobbin is press-fitted into this joint, the protrusion is bitten into the foot, and the bobbin is held between the core holding mold body and the terminal plate. With this configuration, the bobbin or the terminal plate can be easily molded. It becomes possible to easily prevent the howling phenomenon that occurs due to dimensional variations.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
This will be explained with reference to FIG.

FIG. 5 is a perspective view of a terminal plate of the present invention, and FIG. 6 is a cross-sectional view of a high frequency transformer according to an embodiment of the present invention. , the bobbin 12 is made of thermoplastic resin, has a plurality of flanges 12a around which the coil 11 is wound at the upper part, and a wedge-shaped foot part 1 at the lower part.
2b. 13 is a terminal board also made of thermoplastic resin, and the foot part 1 of the bobbin 12 is attached to the side surface.
2b is press-fitted, and an acute-angled protrusion 13b protrudes outward from this joint 13a.
Further, a terminal pin 13c is installed on the lower surface.

A core holding molded body 14 is placed over this terminal plate 13 and the bobbin 12 combined, and this core holding molded body 14 has a cap-shaped core 1 with a core
5 are screwed together. The entire structure is covered with a shield case 16 having an opening 16a on the top surface.

With this configuration, in the terminal board 13, the sharp protrusion 13b provided on the joint part 13a on the side surface of the terminal board 13 bites into the leg part 12b of the bobbin 12, and is held between the core holding mold body 14 and the shield case 16. By doing so, even if there are dimensional variations in the terminal plate 13 or bobbin 12 due to molding, they are firmly connected and the positional relationship between the coil 11 and the core 15 is maintained constant without being affected by external vibrations. .

Effects of the Invention As described above, the high frequency transformer of the present invention has an acute angle protrusion in the groove-like connection part on the side of the terminal plate that is connected to the bobbin, and covers the bobbin foot with a core holding mold body or a shield case. By biting into the coil, it can be firmly connected even if there are dimensional variations in the terminal plate or bobbin due to molding, and the positional relationship between the coil and core can be maintained constant without being subjected to external vibration, resulting in stable characteristics. This can be done and has great practical effects.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of a conventional high frequency transformer, Figures 2 and 3 are the bobbin of the conventional high frequency transformer,
FIG. 4 is a sectional view of the high frequency transformer; FIG. 5 is a perspective view of the terminal board showing an embodiment of the high frequency transformer of the present invention; FIG. 6 is a sectional view of the transformer. It is. 11... Coil, 12... Bobbin, 12a...
Tsuba, 12b...foot part, 13...terminal board, 13a...
...Connecting portion, 13b...Protrusion, 13c...Terminal pin, 14...Core holding mold body, 15...Core, 16...Shield case.

Claims (1)

[Claims] 1 A groove-shaped joint provided on the side of the terminal board is provided with an acute-angled protrusion projecting outward, and a bobbin is provided at the bottom of the bobbin, which has a winding part on the upper part of which the coil is wound around the joint part of the terminal board. The legs are press-fitted, a core holding mold body is provided to hold the core whose position changes in accordance with the coil, and a shielding case is placed over the entire body. A high-frequency transformer that is clamped and connected by inserting protrusions into the legs.