JPS6119179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiving device, and particularly to a novel configuration of a radio wave receiving section in the receiving device.

An object of the present invention is to relate to a plate-shaped radio receiving device and other receiving devices. Conventionally, various small radios have been proposed, but the antenna coil section occupies an extremely large volume. The antenna coil is formed by winding an insulated conductor wire around a rod-shaped ferrite core. Such an antenna coil occupies an extremely large volume of 10 to 20% of a small radio having a volume of, for example, 30 to 100 cm ³ , which has been a constraint on miniaturization.

The present invention forms the antenna coil in a thin plate shape, uses a ferrite sintered magnetic material as the magnetic core of the antenna coil, and uses this ferrite magnetic material in place of the printed circuit board, thereby eliminating the need to use a separate printed circuit board. Therefore, the device can be miniaturized and the device is similar in characteristics to a conventional receiving device.

The invention will be explained in detail below in conjunction with the drawings.
An important feature of the present invention is the use of a magnetic substrate. Furthermore, magnetic thin plates are also used in the construction of laminated transformers. First, a magnetic substrate is obtained by firing a raw sheet (a kneaded body of ferrite powder and a binder) having predetermined through holes. In this case, the magnetic substrate is made of a material with high electrical resistance. If the magnetic substrate does not have sufficient electrical resistance, the surface is coated with an insulating layer such as epoxy resin. On the other hand, in a multilayer transformer, conductive paste (paste containing metal powder such as Pd or Ag-Pd alloy, or Ag powder) is printed on the surface of a magnetic substrate in a predetermined pattern, and then magnetic paste (magnetic ferrite powder) is printed on the surface of the magnetic substrate. (made into a paste with a binder) is printed, and this is repeated alternately to form a predetermined laminated transformer. It is also desirable that the laminate be fired together with the substrate to form a monolithic form.

Now, looking at the drawings, Fig. 1 is a front view of the antenna and antenna coil section configured on the front surface of the magnetic substrate 1, Fig. 2 is a back view of the magnetic substrate 1 with printed wiring, and Fig. 3 is a back view of the magnetic substrate 1 with printed wiring. It is the same side view. The magnetic substrate 1 has a through hole 5 for a connection conductor penetrating on the back side, and an FM antenna coil section 2 on the front side.
An AM antenna coil section 3 and an antenna 4 are formed. The method and structure of forming the coil portions 2 and 3 will be explained with reference to FIG. 4 and subsequent figures. FM antenna coil part 2
The primary side 7 of is connected to the antenna 4 by a conductor 8. The antenna 4 is formed by printing a conductive paste such as silver paste on a magnetic substrate and baking it at a low temperature after forming the antenna coil parts 2 and 3. A terminal 10 on the secondary side 9 of the FM antenna coil is connected to a printed circuit on the back surface of the magnetic substrate 1 via a through hole 5. The AM antenna coil section 3 consists of a primary side 11 and a secondary side 12.
The terminal 13 is connected to the printed circuit on the back side through the through hole 5. The conductor 14 common to the coil legs is a ground conductor.

Preferably, an insulating layer 15 is provided on the back surface of the magnetic substrate 1.
is covered over the entire surface, and a printed circuit 6 is formed on that surface. The printed circuit is equipped with circuit elements such as transistors, diodes, capacitors, resistors, and inductors formed in chip form. The printed circuit 6, the circuit elements, and the method of assembling them are well known, so there is no need to specifically explain them, but what is important for the present invention is that the magnetic substrate also serves as a printed wiring board.

With the above configuration, the antenna, AM and
The FM antenna coil and printed circuit are integrally laminated on the front and back sides of a magnetic substrate, and the magnetic substrate serves as a support for the printed circuit, while the antenna coil can have the necessary inductance due to the magnetic material of the substrate. can.

Next, the manufacturing process and structure of the antenna coil of the present invention will be explained with reference to FIG. 4 and subsequent figures. The antenna coil sections 2 and 3 can be manufactured in the same manufacturing process with necessary design changes. In Figure 4,
1 represents one section of the magnetic substrate shown in FIGS. 1-3. As shown in FIG. 4, a plurality of conductors 20 are applied to the surface of the substrate 1 at equal intervals and inclined to the right. conductor 2
0 is the primary group P and every other 2
It is divided into the next group C, and the lower left ends of P and C are the primary start PS and secondary start CS, respectively, and the upper right ends are the primary finish PF and secondary finish CF. Next, as shown in FIG. 5, a magnetic material 21 having windows 22 is printed or laminated. Like the substrate 1, the magnetic material 21 has insulating properties.
The windows 22 are formed at positions that expose the upper and lower ends of the conductor 20. Next, as shown in FIG. 6, a conductor 23 at equal intervals and inclined to the left is applied to connect the conductor P on the primary side of the conductor 20 to the adjacent conductor P. As a result, the primary-side conductor P of the conductor 20 and the conductor 23 together constitute a flattened primary coil that goes around the central leg portion 24 of the magnetic body 21 . Next, as shown in FIG. 7, a magnetic material 25 having the same structure as the magnetic material 21 shown in FIG. 5 is further printed. Finally, as shown in FIG. 8, left-inclined, equally spaced conductors 26 connecting the secondary conductor C of the conductor 20 to the adjacent conductor C are printed.
As a result, the conductor C on the secondary side of the conductor 20 and the conductor 26
Together, they form a secondary coil that goes around the central leg 24 of the magnetic body 21 and the central leg 27 of the magnetic body 25. Next, this laminate is placed in a firing furnace to sinter the magnetic material, and then, if necessary,
Bake terminal electrodes on PS, CS, PF, and CF. 9th
The figure shows an equivalent circuit of a laminated transformer constructed in this manner. By changing the number of laminated layers and the number of conductor turns depending on whether it is for AM or FM, it is possible to form antenna coils for both types in the same process.

Although the present invention has been explained above, using an insulating magnetic substrate instead of a conventional printed circuit board,
Furthermore, it will be appreciated that the present invention allows the receiver to be made smaller due to the feature that the coil portion can be formed into a thin plate shape using laminated printing technology.

[Brief explanation of the drawing]

Fig. 1 is a front view of the receiving device of the present invention, Fig. 2 is a back view of the same, Fig. 3 is a side view of the same, and Figs. 4 to 8 are manufacturing methods of the AM or FM antenna coil section of the receiving device of the present invention. and a plan view showing the structure, and FIG. 9 is an equivalent circuit diagram of the antenna coil portion manufactured in the steps shown in FIGS. 4 to 8. The main members in the figure are as follows. 1: Magnetic substrate, 2: FM antenna coil section,
3: AM antenna coil section, 4: antenna, 5:
Through hole, 6: Printed wiring pattern, 1
5: Insulating layer.

Claims (1)

[Claims] 1 A laminated transformer is constructed by alternately laminating a conductor and a magnetic material on an electrically insulating magnetic substrate and electrically connecting the conductors, and a means having an antenna function is provided on one surface of the magnetic substrate. A receiving device characterized in that a circuit pattern is formed on the other surface of the magnetic substrate with an insulating layer interposed therebetween.