JPH0511546U - Variable resonance device - Google Patents

Abstract

(57) [Abstract] [Purpose] A variable resonance device in which a trimmer capacitor and a coil are connected is further downsized, and variations in resonance frequency are reduced. A rotor shaft 19 having a rotor electrode plate is rotatably supported from the upper surface side of the insulating substrate 1. The relay terminal 31 penetrates the insulating substrate 1 and is fixed. The stator electrode plate 33 is fixed to the relay terminal 31 on the upper surface side of the insulating substrate 1, and the trimmer capacitor 3 is formed together with the rotor electrode plate. The coil 5 in which a conductor wire is wound several turns is arranged around the bobbin 39 of the insulating substrate 1, one end 5a is connected to the relay terminal 31, and the other end 5 is connected.
b is penetrating the insulating substrate 1 and hung.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to a variable resonance device in which a trimmer capacitor and a coil are connected, and in particular, An RF module that inputs video signals and audio signals and outputs general composite TV signals It is possible to use a high frequency for changing the oscillation frequency in the converter circuit and the TV tuner circuit. The present invention relates to a variable resonance device.

[0002]

[Prior art]

  Conventionally, it can be used in this type of RF modulator circuit and TV tuner circuit. As the variable resonance device, for example, a rotor having a stator electrode plate is rotatably rotatable. A rotor shaft, and a rotor electrode plate on the rotor shaft. , A coil that forms a resonance circuit with this trimmer capacitor When the circuit board is placed on the printed circuit board and the connection terminals are derived from the printed circuit board, Protect the shield case and cover the trimmer capacitor and coil together. It had a configuration of covering a lint circuit board.   Then, by rotating the rotor shaft of the trimmer capacitor, The resonance frequency was finely adjusted by changing the position of the rotor electrode plate with respect to the electrode plate.

[0003]

[Problems to be solved by the device]

  However, in the variable resonance device having the above-mentioned configuration, the trimmer assembled independently is used. Attach the capacitor to the printed circuit board and Since a resonance circuit is formed between the coil and the coil, the overall shape can be reduced. Has a limit.   Recent electronic devices are required to be further miniaturized. However, ingenuity is required from the viewpoint of miniaturization.   Also, in the modulator circuit and TV tuner circuit used in the variable resonance device. Is a high frequency or super high frequency, and due to slight coil deformation and displacement Since the resonance frequency changes, apply adhesive, etc. to the coil on the printed circuit board. This has to be fixed, which complicates manufacturing.

[0004]   Furthermore, when connecting the variable resonance device in parallel with an external circuit, Since one end of all trimmer capacitors cannot be grounded, the trimmer capacitor configuration Requires a special device.   The present invention has been made to solve such conventional drawbacks, and Can be miniaturized, suppress variations in resonance frequency, and be used in various connection states An object of the present invention is to provide a possible variable resonance device.

[0005]

[Means for Solving the Problems]

  In order to solve such a problem, the present invention penetrates an insulating substrate through a relay terminal and fixes it. And rotatably support the rotor electrode plate on its insulating substrate from this one side. The stator electrode plate is supported on the relay terminal on one side of the trimmer capacitor. Is formed, and the lead-out piece is led out from the rotor electrode plate to the facing surface side, Connect one end of the coil to the stator electrode plate through the relay terminal and The other end of the is penetrated through the insulating substrate and is projected to the facing surface side.   Further, in the present invention, the bobbin protruding from the insulating substrate on one side of the bobbin has the above Form the bobbin by arranging the coil or forming an annular groove on one side of the insulating substrate. Preferably,

[0006]

[Action]

  In the present invention having such means, the relay terminal fixed to the insulating substrate is connected to the relay terminal. The rotor electrode plate is supported on the insulating substrate while supporting the data electrode plate. Form a limmer capacitor, but support the other end of the coil on its insulating substrate Is connected to its relay terminal, a trimmer capacitor and coil And the resonance circuit is formed with a short circuit configuration. Also supported by the relay terminal and the insulating substrate.   Further, in the configuration in which the coil is arranged on the outer circumference of the bobbin of the insulating substrate, the coil is positive. Positioned accurately.   Further, in the configuration in which the bobbin is formed by forming the annular groove on the one surface side of the insulating substrate, The coil is positioned by simply fitting the coil into the annular groove.

[0007]

【Example】

  Embodiments of the present invention will be described below with reference to the drawings.   1 and 2 are sectional views showing an embodiment of a variable resonance device according to the present invention (FIG. 2 is It is a cross section between II and II in FIG. 1. It should be noted that it is shown partially viewed from the front.   1 and 2, insulation made by molding steatite, alumina porcelain, etc. The substrate 1 has a trimmer capacitor 3 and a coil 5 attached thereto, On one side of the plate 1 (upper side in the figure), one end 5a of the coil 5 becomes the trimmer capacitor 3. It is connected.   The insulating substrate 1 has a relatively flat block shape as shown in FIG. Is thicker than the other, and recesses 7, 9 are formed on the lower surface side in the thicker portion. Through holes 11 and 13 are formed in the insulating substrate 1 following these recesses 7 and 9. The support hole 15 through which the other end 5b of the coil 5 is inserted penetrates through the thin portion. Are formed.

[0008]   The U-shaped lead-out piece 17 penetrates the insulating substrate 1 from the upper surface side in the vicinity of the through hole 13. Hanging from the concave portion 9.   A through hole 17a is formed in the middle piece of the lead-out piece 17, and the through hole 17a is interposed. Then, the rotor shaft 19 penetrates and hangs down from the concave portion 9, and the diameter inside the concave portion 9 varies. The two washers 21a and 21b are fitted and the tip of the washer is expanded and deformed. The rotor shaft 19 is rotatably supported by the insulating substrate 1 and is guided to the rotor shaft 19. The piece 17 is electrically connected.   A semi-circular rotor electrode plate 23 is integrally formed on the rotor shaft 19 with a slight gap. Is formed, and engages with an engaging protrusion 25a of an adjusting knob 25 described later at the upper end. The engagement groove 19a is formed and the rotor 27 is formed.

[0009]   A relay terminal 31 penetrates through the spacer 29 from the upper surface side of the insulating substrate 1 and a through hole 11 is formed. It is fixed by being inserted into the, and hangs down via the concave portion 7.   A plurality of relay terminals 31 are provided on the upper surface side of the insulating substrate 1 as shown in FIG. The stator electrode plates 33 and the spacers 35 are alternately fitted and fixed, and the stator 37 Are formed.   The tip of the stator electrode plate 33 extends to the center of the rotor shaft 19 and It is cut into a semicircular shape slightly larger than the outer shape of the shaft 19, and the thickness of the spacer 35 is reduced. The spacing between the rotor electrode plates 23 is set to be the same, and the thickness of the spacer 29 is set appropriately. Setting the stator electrode plate 33 and the rotor electrode plate 23 to overlap each other. However, the trimmer capacitors 3 are arranged so as to face each other with a gap (see FIG. 5). reference).

[0010]   The coil 5 has a cylindrical shape that integrally protrudes upward in a thin portion of the insulating substrate 1. The bobbin 39 is wound around the outer circumference of the conducting wire for one to several turns, and one end 5a is insulated by the insulating substrate 1. Is soldered to the tip of the relay terminal 31 or the stator electrode plate 33 on the upper surface side of the , The other end 5b penetrates through the support hole 15 formed at the base of the bobbin 39 and hangs downward. I'm down.   Of course, the coil 5 has a conductive wire wound in advance and the other end 5b penetrates through the support hole 15. In this manner, the bobbin 39 is positioned on the outer periphery of the bobbin 39, and the one end 5a is connected to the relay board 31. Connect to and assemble.

[0011]   An insulating adjusting knob 25 is engaged with the upper portion of the rotor shaft 19. This adjustment The knob 25 has a cup shape, and is engaged with the tip engaging groove 19a of the rotor shaft 19 on the inner upper surface. While the mating engagement piece 25a is formed, the upper end has a slightly smaller diameter and the end face An engaging groove 25b for engaging an adjusting screwdriver or the like is formed in the.   As shown in FIG. 5, the shield case 41 is formed by bending a tin plate into a box shape, for example. Which covers the trimmer capacitor 3, the coil 5 and the adjusting knob 25. Is fixed on the insulating substrate 1 like this, and is adjusted to the fitting hole 41a formed on the upper surface. The upper end of the knob 25 is fitted and protrudes. Reference numeral 41b is a shield cable. It is a connecting piece that hangs from the open lower end of the space 41.

[0012]   In such a variable resonance device, the lead-out piece 17, the relay terminal 31, and the other end 5 of the coil 5 are provided. b and the connection piece 41b of the shield case 41, for example, an RF modulator circuit or Used by connecting to the circuit board of the TV tuner circuit, from the shield case 41 Rotate the tip of the adjusting screwdriver by engaging the engaging groove 25b of the protruding adjusting knob 25. When rotated, the rotor 27 of the trimmer condenser 3 is rotated via the adjusting knob 25. The capacity of the trimmer capacitor 3 can be finely adjusted.   In FIG. 1, the two-dot chain line of the trimmer capacitor 3 portion is the rotor electrode plate 23. It is an imaginary view showing a state in which is rotated (hereinafter the same).

[0013]   The variable resonance device having such a structure has the rotor electrode plate 23 and Of the rotor shaft 19 rotatably supported from the upper surface side of the 1, the trimmer capacitor 3 is supported by the stator electrode plate 33 supported on one side thereof. The lead-out piece 17 from the rotor shaft 19 and the relay terminal 31 are formed on the lower surface of the insulating substrate 1. And the one end 5a of the coil 5 is connected to the relay terminal 31 on the upper surface side. Then, the other end 5b is supported by the insulating substrate 1 and protruded to the lower surface side. Simply by supporting the rotor shaft 19 and supporting the stator electrode plate 33 by the relay terminal 31 In addition to forming a trimmer capacitor, one end 5a of the coil 5 is connected to the relay terminal 31 thereof. A resonant circuit can be formed with a short circuit configuration simply by connecting to.

[0014]   Therefore, the overall shape can be further reduced, and the coil 5 is Since the coil 5 is supported by the joint terminal 31, the bobbin 39 and the insulating substrate 1, The oscillation frequency becomes stable because it is difficult to deform or change.   Also, is it necessary to apply an adhesive or the like to suppress the deformation or displacement of the coil 5? Manufacturing is also simplified.   Furthermore, the lead-out piece 17 from the rotor shaft 19, the relay terminal 31, and the other end of the coil 5 Since 5b is derived independently, it can be connected to external circuits in parallel and non-parallel types. Therefore, the range of use is expanded.

[0015]   6 and 7 are sectional views showing another embodiment of the variable resonance device of the present invention.   That is, the variable resonance device of FIG. 6 has an upper surface side of the insulating substrate 1 having a constant thickness. An annular groove 43 is formed on the bobbin 39, and the coil 5 is fitted into the annular groove 43. In this way, the coil 5 is arranged on the outer circumference of the bobbin 39.   In this way, the coil 5 can be positioned simply by fitting it into the annular groove 43. In addition, since the coil 5 is housed in the annular groove 43, the coil is not It becomes difficult for other parts to come into contact with the coil 5, and the coil 5 is not damaged or its characteristics do not change.   Further, in the variable resonance device of FIG. 7, the bobbin 45 separate from the insulating substrate 1 is used. The bobbin 45 is fitted in the through hole 47 of the coil 5 and the coil 5 is arranged on the outer periphery of the bobbin 45. is doing.

[0016]   With this configuration, the bobbin 45 can be formed of a ferromagnetic material different from that of the insulating substrate 1. Thus, the Q of the coil 5 can be improved.   In the above-described embodiment, the relay terminal 31 is connected to the trimmer capacitor 3 and the coil. However, in the present invention, the location of the relay terminal 31 is not limited to this. Yes.   Also for the trimmer capacitor 3, the rotor electrode plate 23 and the stator electrode plate 3 The number of 7 can be arbitrarily selected according to the target resonance frequency, and However, the conductor wire is not limited to a wound conductor wire, and may be a straight or bent conductor wire. Alternatively, the resonance frequency can be arbitrarily set.

[0017]

[Effect of device]

  As described above, the present invention provides a trimmer capacitor and a coil on an insulating substrate. And the trimmer controller is integrated by the relay terminals fixed to the insulating substrate. Since the capacitor and coil are connected, further miniaturization is possible and The variation of resonance frequency can be suppressed and the usage can be expanded according to various connection states. There is an advantage.   Further, in the configuration in which the coil is arranged on the outer circumference of the bobbin of the insulating substrate, the coil is positive. Since the positioning is done accurately, the resonance frequency becomes more stable.   Further, in the configuration in which the bobbin is formed by forming the annular groove on the one surface side of the insulating substrate, , The coil is positioned by simply fitting it into the annular groove It is housed in the groove 43, making it difficult for other parts to come into contact with the coil during the assembly process. The coil is not damaged or the characteristics do not change.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a variable resonance device according to the present invention.

2 is a cross-sectional view taken along the line II-II in the variable resonance device in FIG.

FIG. 3 is a partially exploded perspective view of the variable resonance device in FIG.

FIG. 4 is a partially exploded perspective view of the variable resonance device in FIG.

FIG. 5 is a partially exploded perspective view of the variable resonance device in FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the variable resonance device according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the variable resonance device according to the present invention.

[Explanation of symbols]

1 Insulation board 3 trimmer capacitors 5 coils 5a one end 5b other end 7, 9 recess 11, 13 through holes 15 Support holes 17 Derived pieces 19 rotor shaft 19a, 25b Engagement groove 21a, 21b washer 23 Rotor electrode plate 25 Adjustment knob 25a engagement protrusion 27 rotor 29, 35 spacer 31 relay terminal 33 Stator electrode plate 37 Stator 39, 45 bobbins 41 shield case 41a fitting hole 41a connection piece 43 annular groove 47 through hole

Claims (3)

[Scope of utility model registration request] 1. An insulating substrate, a relay terminal penetrating and fixed through the insulating substrate, and a rotor electrode plate rotatably supported on the insulating substrate from one side of the stator electrode on one side of the one side. A trimmer capacitor in which a plate is supported by the relay terminal and a lead-out piece from the rotor electrode plate side is led out to the facing surface side, and one end of the one side is connected to the stator electrode plate through the relay terminal. And a coil having the other end penetrating the insulating substrate and protruding toward the facing surface side, the variable resonance device. 2. The coil is arranged on the outer periphery of a bobbin projecting from the insulating substrate on the one surface side.
The variable resonance device described. 3. The variable resonance device according to claim 2, wherein the bobbin is formed by an annular groove formed on the one surface side of the insulating substrate.