JPH0220818Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a variable capacitor with a trimmer capacitor, and in particular, it is an object of the present invention to provide a variable capacitor that uses a cover to protect the trimmer capacitor from the outside and that makes it easy to install the cover. purpose.

FIG. 1 shows a conventional variable capacitor. In the figure,
1 is a substrate, 2 is a push plate, and between the substrate 1 and the push plate 2 are disposed a rotor and a stator that faces the rotor at a distance and forms a capacitance. 3 is a rotor shaft that fixes the rotor and is supported by the push plate 2 and has one end passing through the substrate 1; 4 is a stator support that supports the stator and has one end that passes through the push plate 2 and forms an external terminal; 5 is a case that encloses the rotor and stator. A trimmer capacitor 6 is provided on the upper surface of the substrate 1, and the capacitance value formed by the rotor and stator is adjusted by the trimmer capacitor 6.

According to the above configuration, the entire trimmer capacitor 6 is directly exposed to the outside, so when it is attached to a circuit board, it may come into contact with other parts and cause a change in capacitance, or come into contact with other parts and cause electrical damage. Also, adjustment of the trimmer capacitor is usually done by rotating it using a screwdriver, but when doing so, the screwdriver and the groove of the trimmer capacitor (reference numeral 7 in Figure 1) may There was a problem with the time-consuming adjustment work.

The present invention eliminates the above-mentioned drawbacks, and embodiments thereof will be described with reference to FIG. 2 and the subsequent drawings.

2 to 4 show a first embodiment of a variable capacitor with a trimmer capacitor according to the present invention,
They are a perspective view with the cover removed, a partially sectional side view, and a partially enlarged view of the cover, respectively. In the figure, 11 is a board, and 12 is a case. Inside the case 12, a rotor is arranged between the board 11 and a push plate, and a stator is arranged spaced apart and facing the rotor, just like a normal variable capacitor, although the drawing is omitted. ing. Reference numeral 13 denotes a metal support supporting the stator and projecting to the outside through the substrate 11 and the push plate. 14 fixes the rotor, one end is supported by the push plate, and the other end is connected to the base plate 1.
1 is the rotor shaft passing through the rotor shaft. A trimmer capacitor is arranged on the substrate 11, and the trimmer capacitor is constructed by assembling a stator 15, a rotor 16, and a rotor shaft 17 to a trimmer substrate 20. Holes are formed at the four corners of the trimmer board 20, and the stator columns 13 pass through these holes.
The trimmer board 20 is fixed to the board 11 by a flange 13a provided at the flange 13a.

21 is a cover for the trimmer capacitor, and this cover 21 has a thin plate shape made of resin, and has holes 22 at the four corners.
The thick portion 22 provided with the shape a, the plurality of openings 23, and the protrusions 24 are formed by integral molding. cover 2
1 is assembled and fixed to the substrate 11 of the variable capacitor as shown in FIG. 3 by fitting and press-fitting the tip of the stator column 13 mentioned above into the hole 22a. Note that the protrusion 24 is used to reinforce the cover 21 because it is a thin plate and has weak mechanical strength, and is also used to strengthen the cover 21 and the trimmer board so that the cover 21 does not deform and interfere with the adjustment of the trimmer capacitor. It has the role of maintaining the distance from the 20. The opening 23 of the cover 21 is formed to operate the rotor shaft 17 of the trimmer capacitor from the outside, and as shown in FIG.
It has a guiding function for the rotor shaft operating driver.

FIG. 5 is a partially sectional side view showing a second embodiment of the trimmer-equipped variable capacitor according to the present invention. In the figure, 31 is a substrate, 32 is a push plate, 33 is a stator,
34 is an insulating spacer interposed between the stators 33, 33; 35 is a stator shaft that supports the stator 33 and is fixed to the substrate 31 and the press plate 32; 36 is a fixed rotor (not shown) that faces the stator and forms a capacitance. 37 is a trimmer capacitor assembled to the push plate 32, 38 is a thick wall portion 39 having a hole 39a, and a trimmer capacitor 3, as shown in FIG.
Opening 4 provided for adjusting 7 from the outside
0 and a protrusion 41, respectively. In this embodiment, the trimmer capacitor 37 and the cover 38 are provided on the push plate, and the cover 3
8 is fixed to the variable capacitor by fitting and press-fitting the tip of the stator column 35 protruding from the push plate 32 of the variable capacitor into the hole 39a.

FIG. 6 is a perspective view with the cover removed showing a third embodiment of the trimmer-equipped variable capacitor according to the present invention. In the figure, a cover 51 has a thick part 52 with holes 52a provided at four corners and a plurality of openings 23 formed by integral molding. The cover 51 omits the collar 13a provided on the stator support column 13 shown in FIG.
The thick part 52 is extended in the side direction from the four corners, and the extended part 52b serves to increase the mechanical strength of the cover 51 as shown in the protrusion 24 in FIG. 2. Responsible for

As mentioned above, according to the present invention, a cover is provided above the trimmer capacitor provided on the outer surface of the variable capacitor body, so when the variable capacitor is attached to a circuit board, capacitance changes occur in close proximity to other components. The advantage is that it can prevent or reduce electrical short circuits due to contact with other parts, and it is easy to work because the cover and the variable capacitor body are fixed simply by fitting and press-fitting. occurs.

[Brief explanation of drawings]

Figure 1 is a diagram showing a conventional variable capacitor with a trimmer capacitor, Figures 2 to 4 are diagrams showing the first embodiment of the variable capacitor with a trimmer capacitor according to the present invention, and Figure 2 is a diagram with the cover removed. FIG. 3 is a partially sectional side view, FIG. 4 is a partially enlarged view of the cover, and FIG. 5 is a partially sectional side view showing a second embodiment of the variable capacitor with a trimmer capacitor according to the present invention. , FIG. 6 is a perspective view with the cover removed showing a third embodiment of the variable capacitor with trimmer capacitor according to the present invention. 21, 38... Cover, 37... Trimmer capacitor, 22a, 39a... Hole, 13, 35... Stator support.

Claims (1)

[Scope of utility model registration request] A trimmer capacitor is provided on the outer surface of the variable capacitor body, and a plate-like cover having an opening for adjusting the trimmer capacitor is provided above the trimmer capacitor, and the cover has a thick wall portion with holes at four corners. The variable capacitor main body is formed by integral molding, and a support is protruded from the outer surface of the variable capacitor body in correspondence with the hole in the cover. A variable capacitor with a trimmer capacitor that is press-fitted into the variable capacitor body.