JPH0221127B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite electronic component in which the circuit is miniaturized and the density is increased.

Conventionally, in intermediate frequency transformers used in radios, etc., as shown in Figure 1, a cylindrical capacitor b is attached to the bottom surface of the base of a coil bobbin a, and this is mounted together with the coil in a casing that also serves as a shield. It is constructed by being housed within the body c.

However, in recent years, as electronic components have become smaller and thinner, it has become necessary to reduce the overall height of the housing, and conventional cylindrical capacitors are too large to be incorporated into the housing. However, since it is inevitably attached externally, the above-mentioned request could not be met.

In order to solve these problems, the present invention has the following features:
The present invention provides a composite electronic component in which an electrode is formed on a part of the bobbin of a coil and a capacitor is configured within the housing.

An embodiment of the present invention will be described with reference to the drawings. In FIGS. 2 and 3, a flange 4 is attached to an appropriate position on the outer periphery of a bobbin 3 of a coil 2 mounted in a rectangular housing 1. Electrode layers 5, 5 having free ends are formed on both the upper and lower surfaces by printing, vapor deposition, or other means.

The flange 4 may be integrally molded with the coil bobbin 3, or it may be separately formed with a desired dielectric constant and attached.

In this way, when a capacitor consisting of the electrode layers 5, 5 is formed on the flange 4 provided around the coil bobbin 3, it is easy to form a capacitor with a desired capacitance by appropriately setting the thickness and dielectric constant of the flange 4. can be obtained, and the influence on the magnetic flux of the coil 2 can be reduced if the electrode layers 5, 5 are not provided in a circular pattern, that is, a structure in which they are provided over the entire circumference of the flange 4, but are left partially open. has advantages.

In the capacitor constructed in this manner, a connecting conductor 6 such as a copper wire is connected to the electrode layers 5, 5 by a known means such as soldering, and the winding 7 of the coil 2 and the inside of the lower end of the casing 1 are connected. Coil bobbin base 8 fitted to
It is electrically connected to the terminal 9 attached to the.
In addition, in the figure, 10 is the core of the coil.

4 and 5 show another embodiment of the present invention. In FIG. 4, an insulator 11 is mounted around the lower end of the coil bobbin 3, and the insulator 11 as a flange provided around the coil bobbin 3 is attached. A conductor electrode 5 is provided on a part of the upper and lower surfaces.
5 is fixed to form a capacitor, and its lower electrode 5 is brought into close contact with the coil bobbin base 8 to which the terminal 9 is attached.
Electrodes 5, 5 are fixed to the upper and lower surfaces of a base 8 as a flange provided around the lower end of the bobbin 3, and the coil bobbin base 8 is used as an insulator of the capacitor, and the other structure is the same as that of the above embodiment. The same is true.

As described above, the present invention relates to a composite electronic component characterized in that a capacitor is constructed within the housing by forming an electrode on a part of the bobbin of the coil built into the housing. It is possible to provide small-sized composite electronic components, and the overall structure can be made smaller and more dense, and by electrically connecting coils and capacitors, it is possible to provide small-sized composite electronic components such as small intermediate frequency transformers. Parts can be obtained.

Moreover, since the capacitor consists of a flange provided around the outer periphery of the bobbin and an open-loop pattern of electrodes provided on the top and bottom surfaces of the flange, the capacitor has a free end. It has the advantage of being less affected by

[Brief explanation of drawings]

Figure 1 is a simplified vertical cross-sectional view of a conventional composite electronic component.
2 to 5 show three embodiments of the present invention, FIG. 2 is a vertical sectional view of Example 1, and FIG. 3 is a longitudinal cross-sectional view of Example 1.
A cutaway plan view taken along the line A-A', Figure 4 is Example 2.
FIG. 5 is a longitudinal sectional view of Example 3. 1 is the housing, 2 is the coil, 3 is the coil bobbin, 4
is a flange, 5 is a conductor electrode layer, 6 is a connecting conductor, 7 is a winding wire, 8 is a bobbin base, 9 is a terminal, 10 is a core,
11 is an insulator.

Claims (1)

[Claims] 1. A coil wound around a bobbin enclosed in a housing, a flange provided around the outer periphery of the bobbin, and an open loop pattern provided opposite to each other on the upper and lower surfaces of the flange and having free ends. A composite electronic component comprising: a capacitor having an electrode portion; and the capacitor is electrically connected to the coil.