JPH0638340U - Composite electronic components - Google Patents

Abstract

(57) [Abstract] [Purpose] A plurality of parts that make up one functional circuit are integrated to enable inspection and adjustment for each unit and facilitate assembly and replacement. [Structure] An insulating resin case is provided with a partition plate integrally provided with elastic tongues to provide a plurality of cavities in the case, and high frequency waves are placed in the cavities on both sides of the cavities containing the variable capacitors The coil is housed and these electronic components form one functional circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a composite electronic component which is extremely effective in combining electronic components, and particularly relates to a combination of main components of a front end portion of a radio receiver.

[0002]

[Prior art]

 Conventionally, in electronic devices such as radios and television receivers, it is common to mount electronic components one by one on a printed circuit board or the like by an automatic insertion machine or the like. Therefore, adjustment and inspection of electronic devices are performed in the final step after mounting on the printed circuit board. If the electronic circuit part of an electronic device has parts that are relatively difficult to adjust, and if a final inspection reveals that part is defective, all electronic parts mounted on the printed circuit board will be removed. The inspection must be done after discarding or replacing the electronic parts of the part and re-adjusting. Therefore, there is a drawback that the manufacturing process is complicated, and thus there is a problem that causes the manufacturing cost of the electronic device to be increased.

For example, recently, an electronic tuning circuit in the front end of an AM radio receiver that does not require tracking adjustment is being put to practical use. In general, this electronic tuning circuit unit is subjected to tracking adjustment in the final step after mounting electronic components such as a high frequency coil on a printed circuit board one by one. However, the rate of non-adjustment is high, in which case all electronic components mounted on the printed circuit board must be discarded. If the electrical characteristics of the composite electronic component, which contains the main components of the front end part in advance, can be adjusted before mounting on the printed circuit board, the above problems will be solved.

[0004]

[Problems to be solved by the device]

 The present invention has been made to eliminate the above-mentioned problems, and its main purpose is to treat a plurality of parts constituting one functional circuit as a composite and to treat them as one unit, and inspect each unit in advance. It is possible to make adjustments and make it convenient to assemble and replace.

Another main object of the present invention is to provide a composite electronic component in which two or more different electronic components are combined extremely easily. Yet another object of the present invention is to provide a composite electronic component suitable for the front end portion of the electronic tuning circuit of a radio receiver.

[0006]

[Means for Solving the Problems]

 In the composite electronic component of the present invention, a partition plate is provided in an insulative resin case to provide a space for accommodating the electronic component, and in order to functionally block the circuit of the electronic device, the main component is placed in the space. It is integrated into one unit by housing the electronic components that make up a functional circuit including a high frequency coil and a variable capacitance diode, such as an electronic tuning circuit of a radio receiver, in an insulating resin case. This makes it possible to easily combine them, is advantageous in reducing the manufacturing cost of electronic devices, and is extremely effective in improving productivity.

[0007]

【Example】

 A composite electronic component according to the present invention will be described with reference to FIGS. 1 to 4 by taking an electronic tuning circuit as an example.

1 and 2 are perspective views showing the appearance of an embodiment of a composite electronic component according to the present invention. In the embodiment of FIG. 1, a resin case 1 has two high-frequency coils 2 and another Electronic components are stored, and FIG. 2 shows an embodiment in which three high frequency coils and other electronic components are stored. Reference numeral 3 is a terminal pin of a high frequency coil, and 4 is a lead terminal of an electronic component such as a variable capacitance diode.

FIG. 3 is a diagram for explaining a state in which two high frequency coils 2 and electronic parts such as a variable capacitance diode 6 are housed. The high frequency coil 2 is housed in an insulating resin case 1. In this example, a plurality of empty spaces 8a are formed by a partition plate which is provided with the tongue piece 5 and is integrated with the insulating resin case 1. The tongue piece 5 is made of the same resin as the case and has some elasticity, so that the high-frequency coil 2 can be easily inserted into the void 8a. After mounting the high frequency coil 2, the tongue piece 5 returns to its original state to elastically hold the shield case, and the high frequency coil 2 is housed in the resin case 1. In this way, by providing the resin case 1 with the partition plate having the tongue piece 5 and providing a plurality of cavities, several high-frequency coils 2 can be easily integrated. Of course, the void 8a is formed corresponding to the shape of the high frequency coil to be stored.

Further, a concave portion 2c is formed in the mold base 2a portion where the terminal pin 2 at the bottom of the high frequency coil 2 is implanted, and the concave portion 2c accommodates other electronic components such as the capacitor 9.

On the other hand, the variable-capacitance diode 6 is housed in the space 8b provided between the spaces 8a in which the mold part 6 houses the high-frequency coil and 8a. In this example, a protrusion 7 is formed on the partition plate forming the void 8b, and when the variable capacitance diode 6 is press-fitted into the void 8b, the resin-made elastic protrusion 7 is pressed and slightly deformed. The variable capacitance diode 6 is sandwiched and fixed in the space 8b. At the same time, an adhesive may be injected to fix the resin case 1 and the mold portion 6 together.

The arrangement of the high frequency coil 2 and the variable capacitance diode 6 is, as shown in FIG. 3, provided with cavities 8a for accommodating the high frequency coil 2 on both sides of the cavity 8b in which the variable capacitance diode 6 is accommodated. It is arranged symmetrically. Therefore, the wiring design of the printed circuit board is easy.

As described above, the resin case 1 of the present invention has the high frequency coil 2 housed in the space 8a formed by partitioning the inside of the resin case 1 with the partition plate having the tongue piece 5, and has a variable capacity. By storing the resin-molded semiconductor device such as the diode 6 in the empty space 8b, each electronic component is conventionally mounted by an automatic insertion machine. Can be mounted on a printed circuit board, and it becomes extremely easy to form functional electronic circuits into blocks. Therefore, the electrical characteristics of each electronic circuit can be inspected by a composite electronic component that has been composited in advance so as to be divided into blocks according to the function of each electronic circuit, and the yield of the final product becomes extremely good. Furthermore, the wiring of the printed circuit board becomes easy.

FIG. 5 is a circuit diagram of an electronic tuning circuit of an AM receiver which does not need a trimmer capacitor and does not need tracking adjustment. The electronic tuning circuit of such an AM receiver has a very small number of components, the high frequency coils 20 and 21 and the variable capacitance diode 6 which are the main electronic components are housed in the cavities 8a and 8b in the case 1, and By housing the components such as the capacitors 22 and 23 at the bottom of the high frequency coil 2, the electronic tuning circuit (electronic tuner) of the AM receiver can be formed very easily. Reference numeral 25 is a terminal connected to the high frequency amplifier circuit, 26 is a terminal to which a tuning voltage applied to a variable capacitance diode or the like of the tuning circuit is supplied, and 27 is an output terminal.

Further, in the composite electronic component according to the present invention, the main electronic component of the electronic tuning circuit of the front end portion of the AM receiver is housed in the resin case, so that the external mounting of the electronic tuner is easily made insulating. It is possible to mount electronic components other than the electronic tuning circuit closer to the electronic tuner as compared to the conventional electronic tuner in which a shield case is exposed, and to mount an AM receiver. It can be made small.

The present invention is particularly effective for parts having such a function.

Of course, it is easy to house the three high-frequency coils shown in FIG. 2 by the shape described above with reference to FIGS. 3 and 4. In this case, a variable capacitance diode is arranged between each of the three high frequency coils, and its terminal 4 is led out.

[0018]

[Effect of device]

 The composite electronic component of the present invention is extremely effective in compounding each part of the electronic device, such as the front end part of the electronic tuning circuit, as a circuit block. Since the dynamic characteristics can be adjusted, tracking adjustment is not disabled. In addition, it is possible to make the size and shape smaller by compounding.

Since the composite electronic component of the present invention is covered with an insulating resin case in its outer shape, it is possible to mount other components in close proximity to the conventional case covered with the shield case. It is possible and effective for downsizing the electronic device itself.

Moreover, since the high frequency coil is housed in the vacant spaces on both sides of the vacant space in which the variable capacitance diode is housed, the wiring of the printed circuit board is easy.

Furthermore, it is also effective in reducing the manufacturing cost of electronic equipment.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of a composite electronic component including two high-frequency coils.

FIG. 2 is a perspective view showing an external appearance of an embodiment of a composite electronic component including three high frequency coils.

FIG. 3 is a perspective view having a partially cutout portion for explaining a state where electronic components such as a high frequency coil are stored.

FIG. 4 is a bottom view for explaining a state in which electronic components such as a variable capacitance diode are stored.

FIG. 5 is a circuit diagram of an electronic tuning circuit.

[Explanation of symbols]

 1: Resin case 2: High frequency coil 3: Terminal pin 4: Lead terminal 5: Tongue piece 6: Variable capacitance diode 7: Protrusion in the void 8b 8a, 8b: void 9: Capacitor

Claims (1)

[Scope of utility model registration request] 1. A composite electronic component in which a high-frequency coil and other electronic components are housed in an insulating resin casing and formed integrally with the resin casing having a resilient tongue piece inside the resin casing. Front end of the radio receiver, characterized in that a plurality of cavities are provided by the separated partition plate, at least two high frequency coils are arranged on both sides of the variable capacitance diode, and housed in different cavities respectively. Electronic components for automobiles.