JPH0411376Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a UHF device used in an RF modulator.
Related to oscillators such as band oscillators.

[Conventional technology]

FIG. 1 is a circuit diagram of this type of oscillator. This oscillator is for the UHF band and uses an L/C oscillation circuit. Reference numeral 1 in the circuit is a variable capacitor, reference numeral 2a is a coil having a predetermined inductance, and reference numeral 2b is a coil for resonating and extracting an oscillation signal. The variable capacitor 1 is an adjustment mechanism component that changes the oscillation frequency. Also, the transistor 3a and resistor 3 in the circuit
Electronic components such as b and capacitor 3c, that is, the components surrounded by dotted lines, are mounted on the circuit board 3.

FIG. 2 is a sectional view showing the structure of a conventional oscillator, and FIG. 3 is an external perspective view thereof. Each component shown in the circuit diagram of FIG. 1 is housed in a metal shield case 4 to prevent problems such as unnecessary radiation. Rotor 1a of variable capacitor 1
is installed on the rotation adjustment shaft 1c, and the stator 1b
is supported on the inner surface of the shield case 4.
Also, inside the shield case 4, coils 2a, 2
A circuit board 3 on which various electronic components 3a, 3b, and 3c are mounted is fixed together with a resonant line 2 consisting of a resonant line 2. Then, as shown in FIG. 3, a cover 4a is fixed onto the shield case 4, and this shield case 4 is fixed onto the main board 5.
This main board 5 has a circuit mounted thereon that utilizes a signal oscillated within the shield case 4.

[Problem that the invention attempts to solve]

However, in the conventional oscillator described above, each electronic component 3a, 3b, 3c is provided independently within the shield case 4, so a small circuit board 3 that can be stored within the shield case 4 must be separately provided. However, there are drawbacks that the number of parts increases and the assembly and wiring work becomes complicated.

The present invention was developed by focusing on the above-mentioned conventional problems, and aims to provide an oscillator that has a simplified structure, reduces the number of parts, and simplifies assembly and wiring work.

[Means for solving problems]

The oscillator according to the present invention has a small board protruding from the edge of the main board on which the electronic parts constituting the circuit other than the oscillator are mounted, and the electronic parts for the oscillator that require shielding are mounted on this small board. The adjustment component for varying the oscillation frequency is mounted on the shield case that surrounds this small board, and its adjustment shaft protrudes from the shield case. A notch is formed into which the small board is inserted, and the tip of the small board inserted into the shield case from this notch fits into the letter formed on the wall of the shield case, and The shield case is fixed to the small board by fitting the locking protrusion formed on the edge into the groove provided at the base of the small board.

[Effect]

In the above method, when shielding adjustment components such as variable capacitors and electronic components mounted on a board, the components that require shielding are mounted on a small board that protrudes from the main board, and this small board is inserted through a notch. The adjustment component is inserted into a space in the shield case that is not accommodated.
At this time, the tip of the small board is fitted into the groove formed on the wall of the shield case, and the protrusion provided in the notch of the shield case is fitted into the groove at the base of the small board, thereby adjusting the adjustment part. The housed shield case, which has a certain weight, can be easily and reliably attached to a small board.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG. 4 and subsequent drawings.

FIG. 4 is an exploded perspective view of the oscillator, and FIG. 5 is an exploded plan view of the oscillator. The oscillator shown in these figures has the same circuit as that shown in the circuit diagram of FIG. 1 above.

Reference numeral 11 in the figure is a main board. This main board 11 is provided in an electronic device equipped with an oscillator according to the present invention, and circuit components that utilize an oscillation signal from the oscillator are mounted on this main board 11. A small board 11a is provided protruding from the end of the main board 11. moreover,
A projection 11b is formed at the tip of the small substrate 11a, and a groove 11c is formed at the base of the small substrate 11a.
Electronic components such as a transistor 3a, a resistor 3b, and a capacitor 3c, which constitute part of an oscillator, are mounted on the upper surface of this small substrate 11a. (In the conventional oscillator shown in FIG. 2, these electronic components 3a, 3b, and 3c are mounted on a circuit board 3 provided separately within a shield case 4.) The back surface of the small board 11a A wiring pattern is formed on the electronic components 3a to 3c.
This wiring pattern connects it to other circuit components on the main board 11, so that the oscillator signal can be used by the circuits on the main board 11. On the other hand, as shown in FIG. 4, the shield case 12 is formed of a metal plate. A notch 12a is formed in one side of the shield case 12, and this notch 12a is formed in one side of the shield case 12.
A protrusion 1 protruding into the notch 12a from the upper edge of 2a
2b is provided. Furthermore, a groove 12c is formed on the side surface opposite to this side surface. Moreover, as shown in FIG. 5, inside the shield case 12,
A rotor 1a constituting the variable capacitor 1,
A stator 1b and a rotation adjustment shaft 1c are provided, and a resonance line 2 consisting of a coil 2a and a resonance coil 2b is also provided within the shield case 12.
is provided.

When assembling the oscillator, the small board 11a protruding from the main board 11 is inserted into the shield case 12 through the notch 12a. Then, the protrusion 11b on the small board 11a side is fitted into the groove 12c of the shield case 12, and the protrusion 12b on the shield case 12 side is fitted into the groove 11c at the base of the small board 11a. When inserting the small board 11a into the notch 12a of the shield case 12,
Electronic components indicated by 3a, 3b, etc. are notched 12a.
It passes through the space below the inner protrusion 12b. Further, when the protrusion 12b is fitted into the groove 11c of the small substrate 11a, the protrusion 12b is placed above the small substrate 12a and
A space is created above both sides of b, and this space functions as a relief part for a wiring pattern formed on the surface of the small substrate 11a, for example. Then, the wiring pattern on the back surface of the small board 11a and the shield case 12 are fixed to each other by soldering. Also, shield case 12
The variable capacitor 1 and resonance line 2 inside are connected to the electronic components 3a to 3c on the small substrate 11a by lead wires or the like. Furthermore, the opening surface A on the shield case 12 is covered with a cover (not shown).
Close by. As a result, each of the components 1, 2, 3a to 3c constituting the oscillator is shielded within the shield case 12, and unnecessary radiation is prevented from occurring.

In the illustrated embodiment, a variable capacitor is shown as an adjustment mechanism component for varying the oscillation frequency, but a variable capacitance means such as a trimmer capacitor may be used instead of this, and a capacitance variable means such as a trimmer capacitor may be used instead. Adjustment mechanism components may also be used. Furthermore, the coils 2a, 2b, etc. that constitute the resonance line 2 in the illustrated embodiment may be mounted on the small substrate 11a of the main substrate 11 together with the electronic components 3a to 3c.

〔effect〕

As described above, according to the present invention, when electronic components mounted on a board are housed in a shield case that incorporates adjustment components such as a variable capacitor and has a protruding adjustment shaft, electronic components for an oscillator are mounted on the main board. The adjustment component is mounted on a small board protruding from the shield case, and this small board is inserted into an area in the shield case where the adjustment component is not accommodated. In this way, by inserting a small board into the area of the shield case with built-in adjustment parts that does not have adjustment parts, there is no need to provide a separate small board inside the shield case, and the parts that make up the oscillator can be shielded. This allows the main board to be integrated with the main board. Moreover, the small board inserted into the shield case can be positioned within the shield case by the locking part with the shield case, and the area between the small board and adjustment parts is completely separated, ensuring no interference between the two. It can be prevented.

In addition, when attaching the main board and the shield case, insert the small board protruding from the main board through the notch in the shield case, lock the tip of it into the groove on the wall of the shield case, and then lock the small board protruding from the notch into the groove. The stop protrusion is fitted into a groove provided in the base of the small board. Therefore, a heavy shield case with built-in adjustment parts such as a variable capacitor can be hung on a small board and temporarily fixed, and in this temporarily fixed state, the tip and base of the small board can be soldered to the shield case. This greatly simplifies the installation and soldering work of the shield case.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an example of an oscillator, Fig. 2 is a cross-sectional view of a conventional oscillator, Fig. 3 is an external perspective view showing the mounting state of the conventional oscillator, and Fig. 4 and subsequent figures show examples of the present invention. 4 is an exploded perspective view of the oscillator, and FIG. 5 is an exploded plan view thereof. 1...Variable capacitor (adjustment component), 2
... Resonance line, 2a, 2b ... Coil, 3a,
3b, 3c...Electronic components, 11...Main board,
11a...Small board, 11b...Protrusion, 11c...
Groove, 12... Shield case, 12a... Notch, 12b... Protrusion, 12c... Groove.

Claims (1)

[Scope of utility model registration request] A small board is integrally protruded from the edge of the main board on which the electronic parts that make up the circuit other than the oscillator are mounted, and the electronic parts for the oscillator that require shielding are mounted on this small board. An adjustment component for varying the oscillation frequency is mounted on a shield case surrounding the shield case, and its adjustment shaft protrudes from the shield case, and the small board is inserted into the shield case in an area where the adjustment component is not mounted. A notch is formed, and the tip of the small board inserted into the shield case through the notch is fitted into a groove formed on the wall surface of the shield case, and a groove is formed at the edge of the notch. An oscillator characterized in that a locking protrusion is fitted into a groove provided at the base of the small board, and the shield case is fixed to the small board.