JPH0452982Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a trimmer capacitor.

(Prior Art) FIG. 3 is a sectional view showing the structure of a conventional trimmer capacitor.

The trimmer capacitor has a dielectric substrate 1 on which a semicircular stator electrode 3 is formed on the lower surface, and a rotor 2 that has a semicircular protrusion on the lower part that acts as a rotor electrode 4 and is in opposing contact with the dielectric substrate 1. It has a structure in which it is housed in an insulating case 9 that is made up of a casing 9a made of an insulating material and a lid 9b.

The dielectric substrate 1 is housed in a non-rotatable manner, and the rotor 2 is housed in a rotatable manner.
Specifically, the rotation operation part 5 of the upper part of the rotor 2 is inserted through the through hole 10 formed in the center part of the lid 9b.
A rotating force imparting member such as a screwdriver is inserted into the rotor 2 to rotate the rotor 2. In this way, by changing the facing area of the rotor electrode 4 and the stator electrode 3, the capacitance is adjusted.

The rotor electrode 4 is connected to a rotor terminal 6, and the stator electrode 3 is connected to a stator terminal 7, and the rotor terminal 6 is connected to a side surface of an insulating case 9.
Furthermore, the stator terminals 7 are led out from the bottom of the insulating case 9, and the rotor terminals 6 are bent toward the bottom of the insulating case 9 at the lead-out portion, and the distance between the stator terminals 7 and the rotor terminals 6 is adjusted to the external wiring board. The predetermined distance l corresponds to the wiring pattern.

(Disadvantages of the prior art) However, when this conventional trimmer capacitor is attached to an external wiring board using an adhesive such as solder, the rotor terminal 6 is formed of a soft metal, and the length of the rotor terminal 6 is If excessive external stress is applied to the rotor terminal because of its long length, the rotor terminal 6 will be greatly deformed, and the distance between the rotor terminal 6 and stator terminal 7 will deviate greatly from the predetermined distance l. There was a problem that it could not be attached accurately and reliably on a predetermined wiring pattern of a wiring board.

In addition, since the rotor terminal 6 protrudes from the side surface of the insulating case 9, if an automatic loading machine is used to attach the trimmer capacitor to an external wiring board, the trimmer capacitor will be neatly placed on the pallet of the automatic loading machine. As a result, it was extremely difficult to use an automatic loading machine, and manual work was required to attach the trimmer capacitor to the external wiring board.

In addition, when this conventional trimmer capacitor is turned sideways or upside down and applied to a side adjustment type or back adjustment type trimmer capacitor, the rotor terminal 6 and stator terminal 7 attached to the external wiring board are connected to the side bottom surface of the insulating case 9. As a result, the distance between the rotor terminals 6 and the stator terminals 7 varies greatly, and there is also the problem that they cannot be accurately and reliably attached to predetermined locations on the external wiring board. Therefore, this conventional trimmer capacitor cannot be applied to side-adjustable or back-adjustable trimmer capacitors.

(Purpose of the present invention) The purpose of the present invention is to solve the above-mentioned drawbacks all at once, and its purpose is to keep the distance between the rotor terminal and stator terminal constant even if excessive external stress is applied to the rotor terminal. No, it can be mounted accurately and reliably on the predetermined pattern of the external wiring board,
Another object of the present invention is to provide a trimmer capacitor that can be used with an automatic loading machine.

Another object of the present invention is to provide a trimmer capacitor that can be freely applied to side-adjustable or back-adjustable trimmer capacitors.

(Specific means for solving the problem) The present invention includes a dielectric substrate equipped with a stator electrode,
A rotor that is in contact with the dielectric substrate and acts as a rotor electrode is enclosed in an insulating case that has a through hole in a portion of the rotor that faces the rotary operation section, and a stator terminal that is connected to the stator electrode is enclosed in an insulating case. In a trimmer capacitor in which a rotor terminal connected to a rotor electrode is led out from a side part of an insulating case from a bottom part, a groove into which the led out terminal is fitted is formed on the outer surface of the insulating case. This is a characteristic feature.

(Example) Hereinafter, the trimmer capacitor of the present invention will be explained in detail based on the drawings.

FIG. 1 is a sectional view of one embodiment of the trimmer capacitor of the present invention. Note that the same parts as in the prior art are given the same reference numerals.

1 is a dielectric substrate made of barium titanate porcelain or the like, and 2 is a rotor made of metal.

A semicircular stator electrode 3 is formed on the lower surface of the dielectric substrate 1 . Also, in rotor 2,
The lower part thereof is in contact with the dielectric substrate 1, and the rotor electrode 4
A semicircular protrusion is formed to act as a rotational force, and a rotation operation part 5 is formed at the upper part, into which a member such as a screwdriver that applies rotational force comes into contact or is inserted.

The stator electrode 3 is formed on the lower surface of the dielectric substrate 1 by bonding semicircular metal plates with an adhesive such as glass or resin, or by metalizing metal powder such as molybdenum or manganese. The rotor electrode 4 is formed, for example, by etching a semicircular portion of the rotor 2, laser processing, or the like.

The dielectric substrate 1 and rotor 2 are housed in an insulating case 9 consisting of a housing 9a and a lid 9b made of electrically insulating material, with the dielectric substrate 1 being unrotatable and the rotor 2 being rotatable. Each is attached and enclosed. A spring portion 8 of the rotor terminal 6 is interposed between the lid 9b of the insulating case 9 and the rotor 2, and the spring stress of the spring portion 8 causes the rotor 2 to be pushed against the dielectric substrate 1.
are pressed so that they can rotate freely and come into close contact with each other. As a result, the dielectric substrate 1 is connected to the stator electrode 3.
and the rotor electrode 4, and a certain capacitance is imparted between the two electrodes.

A through hole 10 communicating with the rotation operation part 5 of the rotor 2 is formed in the center of the upper part of the lid body 9b, and a rotation force imparting member such as a screwdriver is rotated to rotate the rotor 2 through the through hole 10. It is inserted into the dynamic operation section 5.

The rotor electrode 4 of the rotor 2 is connected to the rotor terminal 6 on the end surface and the top surface of the rotor 2, and also to the stator electrode 3.
is connected to the stator terminal 7 , and the capacitance provided between the stator electrode 3 and the rotor electrode 4 is drawn out between the stator terminal 7 and the rotor terminal 6 .

The rotor terminal 6 is led out from the side surface of the insulating case 9, and the stator terminal 7 is led out from the side surface of the insulating case 9.
The housing 9a and the lid 9b are exposed to the bottom of the housing 9a and the lid 9b.
An insulating case 9 consisting of the above is integrally joined with an adhesive such as resin.

Furthermore, grooves 11 are formed on the outer surface of the insulating case 9, and inside the grooves 11, the insulating case 9
The rotor terminal 6 led out from the side surface is bent and fitted.

This groove 11 functions to firmly attach and position the rotor terminal 6 and stator terminal 7 to the insulating case 9 by fitting the rotor terminal 6 and stator terminal 7 into each other. By fitting the rotor terminal 6, the rotor terminal 6 is firmly attached to the insulating case 9 and positioned, and the rotor terminal 6 and stator terminal 7
It becomes possible to accurately and reliably mount the trimmer capacitor on the predetermined pattern of the external wiring board by keeping the distance between the trimmer capacitor and the trimmer capacitor constant at all times.

At the same time, since the rotor terminals 6 are completely fitted and buried in the grooves 11, they can be arranged neatly on the pallet of an automatic loading machine without protruding from the insulating case 9. This makes it possible to attach it to an external wiring board.

Note that the grooves 11 have substantially the same width and depth as the width and thickness of the rotor terminals 6 and stator terminals 7, and the grooves 11 have substantially the same width and depth as the widths and thicknesses of the rotor terminals 6 and stator terminals 7. By fitting the terminals 7, the rotor terminals 6 and stator terminals 7 do not protrude from the side surface of the insulating case 9, and are firmly attached to the insulating case 9. Furthermore, in order to securely attach the stator terminals 7 and rotor terminals 6 within the grooves 11, the grooves 11 may be filled with an adhesive for bonding the rotor terminals 6 and the like.

Thus, the trimmer capacitor of the present invention is attached and fixed to an external wiring board using an adhesive such as solder, and then a rotation imparting member such as a driver is attached to the rotor 2.
By inserting it into the rotating operation part 5 of the head and rotating the rotor 2, the opposing area between the stator electrode 3 and the rotor electrode 4 is varied, and the capacitance value is adjusted to a desired value.

Next, the case where the trimmer capacitor of the present invention is applied as a side adjustment type trimmer capacitor and a back adjustment type trimmer capacitor will be described in detail.

FIG. 2a shows a sectional view when the trimmer capacitor of the present invention is applied to a side-adjustable type.

The rotor terminal 6 led out from the side surface of the insulating case 9 is directly extended to the outside of the insulating case 9,
The stator terminal 7 led out from the bottom of the insulating case 9 is bent in the extending direction of the rotor terminal 6 at the lead-out portion, and is fitted and buried in the groove 11 formed in the bottom of the case 9 . Note that the distance between the rotor terminal 6 and the stator terminal 7 is corrected to a predetermined distance l according to a predetermined pattern of the external wiring board. In this case, it is preferable to correct only the stator terminal 7 side. This is because if the rotor terminal 6 is corrected, the rotor terminal 6 will protrude beyond the lid 9b having the through hole 10, which may impede the work of inserting a screwdriver or the like into the through hole 10.

Thus, when the trimmer capacitor described above is attached to the external wiring board, a rotating force imparting member such as a driver for adjusting the capacitance is inserted into the through hole 10 located on the side surface of the trimmer capacitor, rotates the rotor 2, and rotates the trimmer capacitor. The capacitance of the capacitor can be adjusted.

FIG. 2b shows a sectional view when the trimmer capacitor of the present invention is applied to a back surface adjustment type.

The rotor terminal 6 led out from the side surface of the insulating case 9 is bent at the lead-out portion toward the lid 9b side of the insulating case 9 where the through hole 10 is located, and the rotor terminal 6 is
The cover 9b is fitted into and embedded in a groove 11 formed on the side surface of the cover 9b, and is extended to the outside from the cover body 9b. Furthermore, the stator terminals 7 led out from the bottom of the insulating case 9 fit into the grooves 11 formed on the bottom and side surfaces of the insulating case 9, and are routed through the lid 9b of the insulating case 9 to the rotor terminals 6. Extended to the outside so as to be parallel to each other.

Thus, when the trimmer capacitor described above is attached to the external wiring board, a rotating force applying member such as a screwdriver for adjusting the capacitance is inserted into the through hole 10 located on the back side of the trimmer capacitor via the external wiring board, and the rotor 2 can be rotated to adjust the capacitance of the trimmer capacitor.

Note that the grooves 11 are formed on the outer surface of the insulating case, and as described above, the grooves 11 are formed on the outer surface of the insulating case.
Depending on the position of the terminal to be routed around the outer surface of the insulating case in the side-adjustable type, grooves may be appropriately formed on the side surface or the bottom surface of the outer surface. Note that the grooves 1 into which the rotor terminals 6 and stator terminals 7 are fitted
1 may be a continuous groove or an intermittent groove as long as it positions the respective terminals 6 and 7.

(Effects of the Invention) As described above, according to the trimmer capacitor of the present invention, grooves into which the stator terminals and rotor terminals fit are formed in the bottom side of the insulating case, and the rotor terminals and/or Since the stator terminals are fitted together, even if excessive external stress is applied to the terminals, the distance between the stator terminals and rotor terminals is always constant, and they can be attached accurately and reliably on the predetermined pattern of the external wiring board. be able to.

In addition, since the terminals are fitted and buried in the insulating case, the rotor terminals or stator terminals do not protrude beyond the insulating case, and multiple trimmer capacitors can be arranged neatly on the pallet of the automatic loading machine. It also becomes possible to attach to external wiring boards using an automatic loading machine, greatly improving the work of attaching external wiring boards.

Furthermore, a single trimmer capacitor can be used in three types: top adjustment type, side adjustment type, and back adjustment type, by bending the rotor terminals and stator terminals in a predetermined direction and fitting them into the grooves, making them strong without shifting. And it can be done easily.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the trimmer capacitor of the present invention. FIG. 2a is a cross-sectional view of the trimmer capacitor of the present invention applied to a side-adjustable type, and FIG. 2b is a cross-sectional view of the trimmer capacitor of the present invention applied to a back-adjustable type. FIG. 3 is a sectional view showing the structure of a conventional trimmer capacitor. 2... Rotor, 6... Rotor terminal, 7... Stator terminal, 11... Groove.

Claims (1)

[Claims for Utility Model Registration] A dielectric substrate provided with a stator electrode and a rotor that contacts the dielectric substrate and acts as a rotor electrode. In a trimmer capacitor that is housed in an insulating case and has a stator terminal that is electrically connected to the stator electrode and a rotor terminal that is electrically connected to the rotor electrode that are led out from the insulating case, the side surface of the insulating case from which the rotor terminal is led out and the Grooves are formed on each of the side surfaces facing the side surface, and grooves communicating with these grooves are formed on the bottom surface of the insulating case, so that both terminals are connected to either the bottom surface side, the top surface side, or the side surface side of the insulating case. A trimmer capacitor characterized by being able to be derived from