JPS6233371Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a UHF tuner device.
The purpose is to increase the effective area of the circuit board, downsize the device, and reduce costs by reducing the number of assembly steps.

As an example of a conventional UHF tuner device, a resonant circuit section is constructed as shown in FIG. 2 using the circuit shown in FIG. That is, a first inductor 1, a second inductor 2, a variable capacitance diode 3, a DC blocking capacitor 4, a resistor 5, and a trimmer capacitor 6 are assembled as shown in FIG. 2 in the relationship shown in FIG. In FIG. 2, the trimmer capacitor 6 includes an adjustment trimmer plate 6A and a trimmer plate 6B.
It consists of The trimmer plate 6B is integrated with the first inductor 1. It should be noted that among the components, the components other than the variable capacitance diode 2 and the resistor 5 are arranged on the upper surface of the substrate 7 and surrounded by a shield plate (or outer frame) 8. Thus, the first inductor 1,
Variable capacitance diode 3, DC blocking capacitor 4
to obtain an approximate resonance frequency, move the second inductor 2 relative to the first inductor 1 to adjust the equivalent inductance of the first inductor 1, and further move the trimmer plate 6A for adjustment relative to the trimmer plate 6B. By adjusting the trimmer capacity, all reception frequencies can be received.

In the conventional tuner device having the resonant circuit section shown in FIG. 7
effective area decreases. Also, during adjustment,
It is conceivable that the adjustment trimmer plate 6A and the second inductor 2 may be damaged due to bending, and at the same time, it is also conceivable that the substrate 7 may be damaged.

Therefore, in order to solve the drawbacks of the conventional UHF tuner device, we devised a UHF tuner device having a resonant circuit section as shown in FIG. This is a shield plate (or outer frame) 38, 38a, 38b, 38c, 38d that has a first inductor 31 connected to a variable capacitance diode 33 erected on the top surface of a substrate 37.
It is surrounded by trimmer capacitor 36
The adjustment trimmer plate 36A is formed by cutting and raising a part of the shield plate 38a, and the trimmer plate 36B is integrally formed with the first inductor 31. Further, the second inductor 32
It is formed by bending the portion punched out with a press when forming the shield plate 38b parallel to the inductor 31. Note that the adjustment trimmer plate 36A and the second inductor 32 are located with the first inductor 31 in between. Therefore, since the board does not require holes for attaching the trimmer plate for adjustment and the second inductor, the effective area of the board increases, which increases the degree of freedom in circuit design and is suitable for miniaturization. Further, since the adjustment trimmer plate and the second inductor are formed integrally with the shield plate (or the outer frame), the work is easy and the substrate or the adjustment trimmer plate and the second inductor are less likely to be damaged.

As mentioned above, the UHF tuner device of the present invention is a UHF tuner device that receives UHF signals, and includes an adjustment trimmer plate and an adjustment trimmer plate integrally formed from a shield plate (or outer frame) around an inductor provided on a circuit board. The degree of freedom in designing a circuit having an inductor is increased, the device can be miniaturized, and assembly is easy. It also has the advantage of being able to prevent damage during adjustment.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a resonant circuit used in a UHF tuner device. FIG. 2 is a partially cutaway diagram showing the resonant circuit section of a conventional UHF tuner device, and FIG. 3 is a partially cutaway diagram showing the resonant circuit section of the UHF tuner device according to the present invention. 31...First inductor, 32...Second inductor, 36...Trimmer capacitor, 36
A... Adjustment trimmer plate, 36B... Trimmer plate, 37... Board, 38... Shield plate.

Claims (1)

[Scope of utility model registration request] In a UHF tuner device that receives UHF signals, the UHF has an adjustment trimmer plate or an adjustment inductor that is integrally formed from a shield plate or outer frame around an inductor provided on a circuit board.
Chuna device.