JPS5824425Y2 - Variable capacitor mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a variable capacitor mounting device that is applied to various receiving devices such as radio receivers.

Various structures have been used for mounting devices for variable capacitors, but in conventional devices for mounting variable capacitors on printed circuit boards, these mechanical connections and electrical connections such as grounding are performed in separate processes.

For this reason, the number of man-hours is large and the cost is high. In addition, a tuner board is usually attached to a variable capacitor, and regarding the electrical connection between the tuner circuit on this tuner board and the intermediate frequency amplification circuit on the main board, which has intermediate frequency and low frequency amplification circuits, etc., conventionally, the tuner board and Lead wires are usually used because they are separated from the main board.

At this time, the lead wire must have some allowance, so it becomes relatively long.

However, since the output signal of the tuner circuit is a high frequency,
If the lead wire is long, there is a problem in that a transmission phenomenon occurs.

To avoid this, shielded wires, coaxial cables, etc. have traditionally been used as the above lead wires, but these are relatively expensive and require significantly more time and effort to solder than ordinary single wires. It has very poor performance and has flaws that make it expensive.

The present invention has been devised in view of the above-mentioned circumstances, and is an extremely effective method for mechanically connecting the three components: a variable capacitor, a first board to be attached to this variable capacitor, and a second board to which this variable capacitor is to be attached. This mechanical connection allows for electrical connection of the ground between the variable capacitor and the second board at the same time, as well as extremely effective electrical connection between the first board and the second board. It is an object of the present invention to provide a variable condenser mounting device that can prevent cracks from occurring between the insertion holes provided in the second board by screwing the second board.

An embodiment of the present invention will be described below with reference to the drawings.

First, 1 is a variable capacitor, 2 is its frame, and 3 is its rotation axis.

Reference numeral 5 designates a tuner board constituting an example of the first board referred to in the present invention.A circuit pattern 7 constituting a tuner circuit is formed on a pattern surface 6 of this tuner board 5, and a tuner circuit is formed on a mounting surface 8. A large number of electronic components 9 constituting the device are mounted.

Further, 11 is a main board constituting an example of the second board referred to in the present invention, and a circuit pattern 13 constituting an audio circuit including intermediate frequency and low frequency amplification circuits is formed on the pattern surface 12 of this main board 11. , and a large number of electronic components 15 forming an audio circuit are mounted on the mounting surface 14.
is mounted.

First, a plurality of connecting legs 2a are provided on one side of the frame 2 of the variable capacitor 1 so as to protrude in a direction perpendicular to the axis of the rotating shaft 3.

On the other hand, the tuner board 5 is provided with a plurality of holes 16 into which the legs 2a are inserted.

Then, the tuner board 5 is inserted into the leg 2a through the hole 16.
is inserted into the variable capacitor 1, and the tuner board 5 is attached to the variable capacitor 1 in a state parallel to the axis of the rotating shaft 3 of the variable capacitor 1.

Note that the legs 2a are sometimes soldered 17 at the same time as the legs of the electronic component 9 during automatic soldering.

At this time, the rotor side terminals of the variable capacitor 1 are also soldered in the same way as the legs 2a, and these are connected to the circuit pattern 7.

Similarly, the stator side terminal of the variable capacitor 1 is connected to a predetermined pattern in the circuit pattern 7.

Further, the variable capacitor 1 is provided at a predetermined position on the main board 11.
A rotating shaft insertion hole 19 is provided.

For example, three screw insertion holes 20 are provided around the insertion hole 19.

Therefore, these holes 19 and 20 are formed in the circuit pattern 1.
It is provided in the ground pattern 13a in 3.

On the other hand, the connection leg 2a of the frame 2 of the variable capacitor 1
Three screw holes 21 corresponding to the screw insertion holes 20 are provided in the side plate 2b on the connection side to the main board 11, which is perpendicular to one side where the main board 11 is provided.
Further, the rotating shaft 3 is arranged so that its axes are substantially perpendicular to each other, and one end thereof protrudes outward from the side plate 2b.

Further, a plurality of protrusions 23 are provided at the end of the tuner board 5 on the connection side to the main board 11, and the main board 11 has a plurality of engagement holes 24 for inserting and securing the protrusions 23. is provided.

In order to connect predetermined terminals of the tuner circuit of the tuner board 5 and predetermined terminals of the intermediate frequency amplification circuit, etc. of the audio circuit of the main board 11, the circuit pattern 7 of the tuner board 5 and the main Connection patterns 7b and 13b are provided in the circuit pattern 13 of the board 11, respectively.
is provided.

These connection patterns 7b and 13b are drawn out so as to face the predetermined protrusion 23 and engagement hole 24 portions.

Similarly, the ground patterns 7a and 13a are also drawn out to predetermined convex portions 23 and engagement holes 24.

According to the variable capacitor mounting device configured as described above, one end of the rotating shaft 3 of the variable capacitor 1 is vertically inserted into the rotating shaft insertion hole 19 from the pattern surface 12 side of the main board 11, and the side plate 2b of the frame 2 is inserted. It is brought into close contact with the ground pattern 13a of the main board 11.

As a result, the variable capacitor 1 is vertically erected with respect to the main board 11, and the tuner board 5 is inserted into the engagement hole 24 of the main board 11 by its protrusion 23, so that both boards 5 and 11 are connected to each other. engaged at right angles.

Therefore, in this state, use the three setscrews 25, insert them into the screw insertion holes 20, screw them into the screw holes 21, and tighten them to secure the variable capacitor 1 at the ground pattern 13a portion of the main board 11. do.

Note that by this screwing, the tuner board 5 is also fixed to the main board 11 via the variable capacitor 1.

However, by screwing the lever, the frame 2 of the variable capacitor 1
The side plate 26 is crimped and electrically connected to the ground pattern 13a of the main board 11, so that the mechanical connection between the variable capacitor 1 and the main board 11 and the electrical connection to the ground are performed at the same time.

In the above connected state, the connection patterns 7b, 13b and the ground patterns 7a, 13 connect the tuner board 5 and the main board 11 at the engagement portion between the convex portion 23 and the engagement hole 24.
a are brought close to each other.

Therefore, by directly soldering 27 these components, a predetermined terminal of the tuner circuit and a predetermined terminal of the audio circuit can be extremely effectively connected without using lead wires or the like.

In addition, soldering 27 of earth patterns 7a and 13a
This is done auxiliary as needed, and even if this soldering 27 is not done, these electrical connections can be made by crimping the side plate 26 of the frame 2 of the variable capacitor 1 to the earth pattern 13 using the screws mentioned above. The electrical connection is sufficient and the grounding of the variable capacitor 1 is complete.

Note that 29 in FIG. 3 is a dial knob, which is fixed to the tip of a dial shaft 31 that is pivotally supported by the chassis 30.

A flywheel 32 is fixed to the dial shaft 31 and is linked to a variable condenser drive shaft 35 supported by the chassis 30 via reduction gears 33 and 34.

The tip of the rotating shaft 3 of the variable capacitor 1 and the tip of the variable capacitor drive shaft 35 are connected to the same axis by a gear coupling 36.

Note that 37 is a cabinet.

Therefore, by rotating the dial knob 29, the rotating shaft 3 of the variable capacitor 1 is rotationally driven via the above-mentioned reduction drive mechanism. becomes larger.

When the drive torque is large, if there is an inclination of the axis between the rotating shaft 3 and the parion drive shaft 35, a strong unbalanced load will act on the rotating shaft 3, which may cause noise due to twisting, cracking, etc. do not have.

However, according to the above-mentioned variable capacitor mounting device, it is easy to maintain the perpendicularity of the variable capacitor 1 with respect to the main board 11 with high accuracy, and the above-mentioned disadvantages can be prevented as much as possible.

In summary, the variable capacitor mounting device of the present invention (a) has a plurality of screw holes provided in one side plate of the frame, and one end of the rotating shaft arranged so that the axis line is substantially orthogonal to the one side plate. A variable capacitor comprising a plurality of legs protruding outward and provided on one side of a frame that is substantially perpendicular to the side plate and protruding in a direction substantially perpendicular to the axis of the rotating shaft. (b) a first board provided with a hole into which the leg of the frame is inserted, and which is attached to the frame in a state substantially parallel to the axis of the rotating shaft; (C) a first board having an electrical connection on one side plate of the frame; A second substrate is formed with a ground pattern that comes into close contact with the ground pattern, and has an insertion hole through which one end of the rotating shaft is inserted through the ground pattern, and screw insertion holes corresponding to the plurality of screw holes, which are spaced apart from each other by a predetermined distance. (d) engaging the first board and the second board at substantially right angles to each other, and in this state inserting the variable capacitor into the second board through the screw insertion hole at the ground pattern portion; are inserted into the screw holes and fixed by a plurality of setscrews, and these circuit patterns are connected to each other by soldering at the connecting portion of the first board and the second board. , is a thing.

This has the following advantages.

(1) By screwing the variable capacitor to the second board,
These mechanical connections and these electrical connections to ground can be made simultaneously.

Therefore, the number of man-hours is small, and costs can be reduced.

(2) Electrical connection between the tuner circuit, etc. on the first substrate and the intermediate frequency amplification circuit, etc. on the second substrate can be made by direct soldering at these circuit pattern portions without using lead wires or the like.

Therefore, there is no inconvenience that occurs in the case of conventional devices using lead wires, such as generation of a transmission phenomenon due to the high frequency of the output signal.

Furthermore, soldering between circuit patterns is extremely easy and highly efficient compared to methods that use lead wires (especially those that use shielded wires or coaxial cables). It is possible to improve the performance and reduce costs.

(3) Since the variable capacitor, the first board, and the second board are integrally connected to each other, they mutually serve as mounting members.

Therefore, unlike the case where these are mounted independently on a chassis, cabinet, etc., the structure and number of parts required for mounting these can be greatly reduced, and the structure is extremely simplified.

(4) By screwing the variable capacitor to the second board, engaging the first board and the second board at right angles, and soldering them, these three exhibit a strong reinforcing effect on each other.

Therefore, it is mechanically very robust, and in particular, it is easy to maintain the perpendicularity of the variable capacitor to the second substrate, and the mechanical connection between the variable capacitor and its drive system can be easily performed.

(5) An insertion hole for inserting the rotating shaft into the ground pattern of the second board and screw insertion holes corresponding to a plurality of screw holes are provided, and a set screw is inserted into the screw insertion hole in this ground pattern portion. By screwing into the screw hole, the variable cap 1 is screwed to establish a mechanical connection.

Therefore, since the part with this ground pattern is similar to the board reinforced with adhesive and conductive material, even if the board is made of a fragile material such as Bakelite, and the shape of the entire variable capacitor is Even if the size becomes smaller and the distance between the insertion holes becomes narrower, by firmly screwing them together, it is possible to effectively prevent cracks from occurring between the insertion holes.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is an exploded perspective view, Fig. 2 is a perspective view of the fully assembled state, and Fig. 3 is a perspective view of the fully assembled state.
The figure is a sectional view of the same as above. In addition, in the symbols used in the drawings, 1... Variable capacitor, 2... Frame, 3... Rotating shaft, 5... Tuner board, 7... ...Circuit pattern, 11...Main board, 13...
...Circuit pattern, 19... Rotating shaft insertion hole, 2
0...Screw insertion hole, 23...Protrusion, 2
4...Engagement hole, 25...Set screw, 27
...It's soldering.

Claims (1)

[Claims for Utility Model Registration] (a) A plurality of screw holes are provided in one side plate of the frame, and one end of a rotating shaft arranged so that its axis is substantially orthogonal to the side plate is connected to the outside of the one side plate. The variable capacitor is provided with a plurality of legs provided on one side of a frame that is substantially perpendicular to the side plate and protrudes in a direction that is substantially perpendicular to the axis of the rotating shaft. (b) a first board provided with a hole into which the leg of the frame is inserted and attached to the frame in a state substantially parallel to the axis of the rotating shaft; (C) a first board for electrical connection to one side plate of the frame; a second substrate, in which a ground pattern is formed in close contact with the ground pattern, and an insertion hole through which one end of the rotating shaft is inserted into the ground pattern and screw insertion holes corresponding to the plurality of screw holes are provided at predetermined intervals; (d) Engage the first board and the second board in a substantially perpendicular state to each other, and in this state insert the variable capacitor into the second board through the screw insertion hole at the ground pattern portion. are inserted into the screw holes and fixed by a plurality of setscrews, and these circuit patterns are connected to each other by soldering at the connecting portion of the first board and the second board. Variable capacitor mounting device.