JPH0410683Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a trimmer device for a variable capacitor.
In particular, it relates to a biasing structure for a trimmer rotor shaft that rotates a trimmer rotor plate.

[Conventional technology]

A conventional variable capacitor trimmer device is shown in FIG. FIG. 5 is a cross-sectional view of the main parts of the variable capacitor trimmer device. 4 is a trimmer rotor shaft that is biased by an elastic washer 5 and holds the trimmer rotor plate; 6 is a washer that maintains a gap between the trimmer rotor plate 3 and the trimmer stator plate 2; and 7 is a ground plate that is grounded. It is. As the trimmer rotor shaft 4 rotates, the trimmer rotor plate 3 moves together to change the facing area between the trimmer rotor plate 3 and the trimmer stator plate 2, and accordingly, the structure is such that the capacitance is varied.

[Problem that the invention attempts to solve]

However, in the device configured as described above, the elastic washer 5 is used to obtain the rotational torque of the trimmer rotor shaft 4, and this elastic washer 5
In order to lock the trimmer rotor shaft 4, the tip of the trimmer rotor shaft 4 must be caulked, resulting in problems such as an increase in the number of parts and complicated work.

An object of the present invention is to provide a trimmer device that solves the above problems.

[Means for solving problems]

The present invention has a structure in which the trimmer rotor shaft is sandwiched between a trimmer board and a trimmer cover placed above the trimmer board, and is elastically biased toward the trimmer cover by a ground plate placed on the surface of the trimmer board. This is what I did.

[Effect]

To eliminate the need for an elastic washer to obtain rotational torque of a trimmer rotor shaft and to facilitate assembly work.

〔Example〕

Next, an embodiment of the trimmer device according to the present invention will be described. Figures 1 to 4 show an embodiment of a variable capacitor trimmer device, with Figure 1 being a plan view and Figure 2 being a plan view.
The figure is a partially cutaway side view of line AB-CD-EF in Figure 1.
FIG. 3 is a perspective view, and FIG. 4 is an exploded perspective view of the trimmer portion. In the figure, reference numerals 10 and 11 indicate metal supports fixed to the four corners of an insulating board 9, respectively.
stator plates alternately fitted with washers 12;
13 is a rotor shaft rotatably mounted in the center of the base plate 9; 14 is a rotor plate that is fitted onto the rotor shaft 13 alternately with washers 15 and opposed to the stator plate 11 with a film 16 in between; Reference numeral 18 denotes a push plate into which the tip 13a of the rotor shaft 13 is fitted in the center, the support 10 is inserted through the corners, and which forms a trimmer substrate of the trimmer capacitor section to be described later; 20 is the push plate 1;
8, is in conductive contact with the tip 13a of the rotor shaft 13 at the center, has terminal portions 20a, 20b, and has a protrusion 20c formed by half punching or drawing. Board, 21
22 is a trimmer rotor shaft fitted into a hole 20d formed on the top surface of the protrusion 20c of the trimmer terminal plate 20;
is a substantially semicircular trimmer rotor plate that is fitted onto the trimmer rotor shaft 21 and cooperates with the trimmer rotor shaft 21;
3 is a film arranged on the trimmer rotor plate 22 and whose four corners are inserted into the support 10; 24 is a film 23;
A trimmer stator plate 25 is arranged above and fitted into a protrusion 18a formed on the support 10 and the trimmer board 18, 25 is a trimmer cover that presses the trimmer rotor shaft, the four corners are inserted into the support 10, and 26 is a trimmer cover such as insulation. This nut is engaged with the threaded portion 10c of the support column 10 and presses the frame 25a of the trimmer cover 25. By engaging the nut 26 with the support 10, the trimmer base plate 18, trimmer rotor shaft 21, trimmer rotor plate 22, film 23, trimmer stator plate 24, and trimmer cover 25 are fixed to the base plate 9.

With the above configuration, when the trimmer rotor shaft 21 is rotated, the trimmer rotor plate rotates together, and the area facing the trimmer stator plate changes, thereby changing the trimmer capacitance formed by the trimmer rotor plate and the trimmer stator plate. . Here, the trimmer rotor shaft 21 is held between the trimmer board 18 and the trimmer cover 25, and is formed on a ground plate with a protrusion 20.
The trimmer rotor shaft 21 is biased toward the trimmer cover side and is configured to obtain an appropriate torque when the trimmer rotor shaft 21 rotates.

[Effect of idea]

As described above, the trimmer capacitor according to the present invention includes a trimmer stator plate held by a press plate, and a trimmer rotor plate that cooperates with a trimmer rotor shaft supported by the press plate.
The trimmer rotor shaft is sandwiched between the push plate and the trimmer cover disposed above the push plate, and is disposed on the surface of the push plate and is elastically biased toward the trimmer cover. It has the advantage that a suitable rotational torque can be obtained by rotating the shaft with the trimmer rotor plate, and the assembly work of the trimmer rotor shaft can be facilitated.

[Brief explanation of the drawing]

Figures 1 to 4 show examples of the trimmer capacitor according to the present invention, Figure 1 is a plan view of the trimmer capacitor assembled to a variable capacitor, and Figure 2 is the AB-CD-EF of Figure 1.
3 is a perspective view, FIG. 4 is an exploded perspective view of a trimmer portion, and FIG. 5 is a sectional view of a main part of a conventional trimmer capacitor. 1, 18... Trimmer board, 2, 24... Trimmer stator plate, 3, 22... Trimmer rotor plate, 4,
21... Trimmer rotor shaft, 7, 20... Earth plate, 20c... Protrusion, 25... Trimmer cover.

Claims (1)

[Scope of utility model registration request] In a variable capacitor trimmer device having a trimmer stator plate held on a press plate of a variable capacitor, and a trimmer rotor plate cooperating with a trimmer rotor shaft supported on the press plate, the trimmer rotor shaft is connected to the press plate and the press plate. A trimmer capacitor configured to be sandwiched between trimmer covers disposed above the plates and elastically biased toward the trimmer covers by a ground plate disposed on the surface of the push plate and electrically connected to the trimmer rotor plate.