JPH0626242U - Semi-fixed electronic components - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a small semi-fixed electronic component which has high suction reliability by an automatic mounting machine and can be easily adjusted automatically by an automatic adjusting machine. [Structure] Dielectric rotor 2 and adjusting pin 3 on insulating substrate 1
Are sequentially mounted and the adjusting pin 3 is rotated,
The dielectric rotor 2 moves together to change a facing area between the stator electrode 12 formed on the insulating substrate 1 and the rotor electrode 22 formed on the dielectric rotor 2 to change a predetermined capacitance value. A fixed electronic component, which is a protruding portion 35 including a plurality of vertical surfaces 33 and an inclined surface 34 inclined from the apex thereof on the outer surface of the head 31 of the adjusting pin 3.
a to 35d were provided around.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a semi-fixed electronic component such as a trimmer capacitor, a semi-fixed resistor, and a variable inductor element whose characteristics can be adjusted by external stress.

[0002]

[Prior art]

 In recent years, electronic devices have become smaller and more highly packaged, and electronic components used in these devices are also required to be smaller and thinner. At the same time, there is a strong demand for semi-fixed electronic components that can be automatically adjusted by an automatic machine and can be reliably and easily mounted on a printed wiring board by an automatic machine.

As shown in FIGS. 5 and 6, a semi-fixed electronic component that has been widely used in the related art, such as a trimmer capacitor, has an insulation in which a stator electrode 12 is formed on the surface and a through hole 11 is formed in the central portion. It is composed of a substrate 1, a dielectric rotor 2 having a rotor electrode 22 formed therein, an adjusting pin 4 having a head portion 41 having an adjusting groove 43 formed therein, and a rotor terminal 24. That is, the dielectric rotor 2 is placed on the surface of the insulating substrate 1, and the adjusting pin 4 is placed on the upper surface of the dielectric rotor 2 through the through holes 11 and 21 of the insulating substrate 1 and the dielectric rotor 2, The lower end of the adjusting pin 4 exposed from the lower surface of the insulating substrate 1 was connected to the rotor terminal 24.

When the adjusting pin 4 is rotated, the dielectric rotor 2 also operates simultaneously, and the facing area between the rotor electrode 22 of the dielectric rotor 2 and the stator electrode 12 changes, which causes a predetermined static motion. The capacitance is derived from between the rotor terminal 24 and the stator terminal 13 integrally formed with the stator electrode 12.

In the conventional semi-fixed resistor, in order to easily transmit the turning force applied from the outside to the dielectric rotor 2, the driver bit, which is an adjustment jig, is provided on the upper surface of the head 41 of the adjustment pin 4. A "-" or "+"-shaped groove 43 is formed so that the tip portion (not shown) can be inserted and rotated.

[0006]

[Problems of conventional technology]

 However, in the conventional semi-fixed electronic component, it is necessary to align the tip of the driver bit with the “−” or “+”-shaped groove 43 of the head 41 of the adjustment pin 4 to perform adjustment. It is extremely difficult to insert the tip of the driver directly into the groove 43 of the head 41 of the adjustment pin 4 of the semi-fixed electronic component among the electronic components densely mounted on the board. It was particularly difficult to automate the machine adjustment.

Further, when the semi-fixed electronic component is mounted at a predetermined position on the printed wiring board, the head of the adjustment pin of the semi-fixed electronic component is sucked by using the suction nozzle of the automatic mounting machine to print. It is carried to a predetermined position on the wiring board and the suction is released (pickup press), but the area of the flat part of the head 41 of the adjustment pin 4 decreases with the miniaturization of the semi-fixed electronic components. In addition, since the suction force leaks from the adjustment groove 43, the semi-fixed electronic component is detached from the suction nozzle during the pickup, so that the mounting reliability was extremely low.

The object of the present invention was devised in view of the above-mentioned problems, and it is a small semi-fixed type which has a high suction reliability by an automatic mounting machine and facilitates automatic adjustment by an automatic adjusting machine. To provide electronic components.

[0009]

[Means for achieving the purpose]

 The specific means implemented by the present invention to achieve the above object is composed of a fixed substrate and a rotating body, and a resistance value, a capacitance value, or an inductance is determined depending on a relative positional relationship between the fixed substrate and the rotating body. A semi-fixed electronic component whose value can be arbitrarily changed is a semi-fixed electronic component in which a protruding portion composed of a plurality of vertical surfaces and an inclined surface inclined from its apex is provided around the surface of the rotating body.

Further, it is preferable that the vertical surface of the protruding portion is arranged in parallel with the vertical surface of any other protruding portion.

[0011]

[Action]

 With the above configuration, a plurality of projecting portions that receive the external stress are formed at least around the head surface of the adjusting pin that is the rotating body, and the central portion thereof is a flat portion. By using the flat portion, the suction of the automatic mounting machine can be reliably performed, and the mounting reliability by suction is improved.

Further, since the projecting portion is composed of a substantially vertical surface and an inclined surface inclined from the apex of the vertical surface, it is possible to press the adjusting driver against the surface of the cap body and slightly rotate it. Since the external stress-applying portion of the adjusting driver, for example, the main surface of the minus driver is guided so as to contact the vertical surface of the protruding portion, automatic adjustment by the automatic machine can be easily performed.

Further, if the vertical planes of the plurality of protrusions are arranged so as to be parallel to the vertical planes of the other protrusions, the adjustment can be performed manually not only by an automatic machine but also by using a minus driver. Becomes

[0014]

【Example】

 Hereinafter, a trimmer capacitor which is a semi-fixed electronic component of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a trimmer capacitor of the present invention, FIG. 2 is a view showing the upper surface of an adjusting pin, and FIG. 3 is a perspective view of the adjusting pin.

In the figure, 1 is an insulating substrate which is a fixed substrate, 2 is a dielectric rotor made of a dielectric ceramic, and 3 is an adjusting pin which is a rotating body.

The insulating substrate 1 is made of a resin such as polyester, and a through hole 11 is formed in the central portion of the substrate 1. Further, a semicircular stator electrode 12 is formed on the surface of the substrate 1, and the stator terminal 12 is integrated with the stator electrode 12 from one end of the bottom surface of the substrate 1 and leads to a stator terminal 13. The stator electrode 12 and the stator terminal 13 are made of phosphor bronze, brass or the like.

The dielectric rotor 2 is made of a dielectric porcelain having a predetermined permittivity including calcium titanate, lanthanum oxide, titanium oxide, and lanthanum titanate. A through hole 21 is formed, and a semicircular rotor electrode 22 made of Ag-palladium alloy is formed inside. A part of the rotor electrode 22 is exposed on the inner wall of the through hole 21. A conductive film 23 made of Ag or the like is formed on the inner wall of the through hole 21 as needed. The dielectric rotor 2 co-acts with the adjusting pin 3 which is a rotating body at the same time by an external turning force.

The adjusting pin 3 is made of Ag-plated phosphor bronze or the like, and is composed of a head portion 31 to which a turning force is applied from the outside, and a pin portion 32 extending from the head portion 31.

The rotor terminal 24 is arranged on the bottom surface of such an insulating substrate 1, and the dielectric rotor 2 is placed on the substrate 1, and the surface of the dielectric rotor 2 is adjusted by an adhesive. The pin 3 is placed so that the pin portion 32 of the adjusting pin 3 is inserted into the through holes 21 and 11 of the dielectric rotor 2 and the insulating substrate 1, and further, the pin portion 32 of the adjusting pin 3 is placed on the bottom surface of the insulating substrate 1. Caulking is performed so that the lower end portion and the rotor terminal 24 are sandwiched. As a result, the rotor terminal 24 is fixed to the bottom surface of the insulating substrate 1, and the dielectric rotor 2 and the adjusting pin 3 are rotatably arranged with respect to the insulating substrate 1. By the crimping process, the pin portion 33 and the rotor terminal 23 are electrically connected.

With the above configuration, the electrostatic capacitance proportional to the area of the dielectric rotor 2 where the stator electrode 12 and the rotor electrode 22 face each other is derived from between the stator terminal 13 and the rotor terminal 23. . That is, the stator electrode 12 and the stator terminal 13 are integrally formed, and the rotor electrode 22 is connected to the rotor terminal 24 via the conductor film 23 on the inner wall of the through hole 21 and the pin portion 32 of the adjustment pin 3. Connecting.

The characteristic part of the present invention is that, with respect to the structure of the head 31 of the adjusting pin 3 to which a turning force is applied from the outside, as shown in FIG. 33, and the protrusions 35a, 35b, 35c, and 35d formed of the inclined surface 34 inclined from the apex of the vertical surface 33 are formed.

Preferably, the vertical surface 33 of the protruding portion 35a and the vertical surface 33 of the protruding portion 35c are arranged in parallel with a predetermined gap g, and the vertical surface 33 of the protruding portion 35c and the vertical surface of the protruding portion 35d are perpendicular to each other. The surfaces 33 are arranged in parallel with a predetermined gap g.

As described above, since the plurality of protrusions 35a to 35d are formed on the outer peripheral portion of the head 31 of the adjustment pin 3, the central portion surrounded by the protrusions 35a to 35d is a flat portion.

When this trimmer capacitor is mounted on a predetermined position of a printed wiring board (not shown), first, cream solder is applied on a predetermined electrode pad of the printed wiring board, and then the automatic soldering is performed. Suction is performed so that the suction nozzle, which is the suction means of the mounting machine, comes into contact with the flat portion of the head portion 31 of the adjustment pin 3 of the trimmer capacitor. As a result, the trimmer capacitor is picked up from the storage tape or the pallet, for example. After that, the suction nozzle is conveyed, and the rotor terminal and the stator terminal of the trimmer capacitor are placed at the positions matching the electrode pads of the printed wiring board, and the suction is released. Finally, simultaneously with other surface mount electronic components, soldering is performed with cream solder by heat treatment.

In the above-mentioned mounting process, in the trimmer capacitor of the present invention, since the adjustment pin 3 has no mani- sice or a positive adjustment groove formed in the head as in the conventional case, the area of the flat portion of the head is reduced. Since the suction force does not leak and the mounting reliability of the automatic mounting machine is improved, the trimmer capacitor can be downsized to an area where the suction pin can contact the adjustment pin.

Next, the adjustment of the capacitance of the trimmer capacitor mounted on the printed wiring board will be described. The most difficult adjustment in the conventional automatic adjusting machine is the adjustment with the driver at the tip of the driver bit. The position was to match the pin groove. On the other hand, in the present invention, since the protrusions 35a to 35d are formed around the head of the adjustment pin, a minus screwdriver of the driver bit that extends over at least the diameter of the head 31 of the adjustment pin 3 is formed. Is moved downward so as to contact the head 31 of the adjusting pin 3. For example, as shown in FIG. 4, the minus driver 50 (indicated by a dotted line in the figure) comes into contact with the two protruding portions 35a to 35d, for example, the inclined surface 34 of the protruding portions 35b and 35d. By pushing further downward, the tip of the driver slides on the inclined surface 34 and is guided to the lowermost portion of the inclined surface 34 as indicated by the arrow in the figure. As a result, one of the two main surfaces of the driver 50 contacts the vertical surface 33 of the protruding portion 35a, and the other surface contacts the vertical surface 33 of the protruding portion 35c. When the driver bit is rotated counterclockwise in this state, the rotation imparting force from the driver 50 is transmitted to the vertical surface 33 of the protrusions 35a and 35c, and the adjustment pin 3 can be rotated by a predetermined amount.

That is, the driver 50 of the automatic adjuster is brought into contact with the adjustment pin 3 and slightly pushed downward, and the driver is guided to the vertical surface 33 of the protrusions 35a and 35c which receive the rotation imparting force. As a result, it is possible to easily and surely perform automatic adjustment without the need for difficult positioning as in the past.

This is explained by the adjustment by the automatic machine, or the same operation can be performed manually by using a normal minus driver.

Further, if the four protrusions 35a to 35d are formed on the head 31 of the adjustment pin 3 as shown in the figure, not only a minus driver but also a plus driver can be used for adjustment. Become.

In particular, if the vertical surfaces 33 of the projecting portions 35a and 35c, 35b and 35d facing each other are formed in parallel with each other with a gap g corresponding to the thickness of the driver 50, the minus driver 50 Since the main surface and the vertical surface 33 can be completely brought into contact with each other, the vertical surface 33 of the protrusions 35a to 35d is not blunted and the life is extended.

As described above, according to the present invention, the protrusion 335 a having a substantially triangular shape including the vertical surface 33 and the inclined surface 34 and receiving an external turning force is provided on the outer peripheral portion of the head 31 of the adjustment pin 3. To 35d are provided, the flat surface of the head portion 31 surrounded by the protrusions 335a to 35d can be used to perform highly reliable mounting, and the surrounding protrusions 35a to 35d can be used. As a result, highly accurate alignment is not required, and simple and reliable adjustment work can be performed. Further, since it is not necessary to form the adjustment groove, and the adjustment pin 3 can be downsized while ensuring a flat portion suitable for mounting, a trimmer capacitor that is downsized as a whole is possible.

It should be noted that, in the above-described embodiment, the description has been made by using the trimmer capacitor, or it can be widely applied to other electronic parts having the adjusting pin to be rotated, for example, a semi-fixed resistance part and a variable inductance. In the case of semi-fixed resistance parts, the adjustment pin, which is a rotating body, is the cap body that rotates integrally with the slider, and in the case of variable inductance, it is used for the air core of the coil. The core member is rotatably inserted, and the other structures are variously changed in each electronic component.

[0034]

[Effect of device]

 As described above, according to the present invention, since the protruding portion including the vertical surface and the inclined surface is provided on the outer peripheral portion of the surface of the rotating body, that is, the adjustment pin, the protruding portion receives the external turning force. Since a small semi-fixed electronic component is achieved, and further, the inclined surface can guide the driver bit to a predetermined rotation position, it is not necessary to perform highly accurate positioning.

Further, since the flat portion in the central portion of the surface of the adjustment pin is formed, a semi-fixed electronic component having improved suction reliability in the automatic mounting device is achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of a trimmer capacitor which is an example of a semi-fixed electronic component of the present invention.

FIG. 2 is a plan view of an adjustment pin used in the trimmer capacitor of the present invention.

FIG. 3 is a perspective view of a head portion of an adjustment pin.

FIG. 4 is a schematic diagram for explaining rotation adjustment of an adjustment pin.

FIG. 5 is an external perspective view of a conventional trimmer capacitor.

FIG. 6 is a sectional view of a conventional trimmer capacitor.

[Explanation of symbols]

 1 ... Insulating substrate 11 ... Through hole 12 ... Stator electrode 13 ... Stator terminal 2 ... Dielectric rotor 21 ... Through hole 22 ... Rotor electrode 24 ... Rotor terminal 3 ... Adjusting pin 31 ... Head 35a to 35d ... Projection 33 ... Vertical surface 34 ... Inclined surface

Claims (2)

[Scope of utility model registration request] 1. A semi-fixed electronic component comprising a fixed substrate and a rotating body, wherein a resistance value, a capacitance value or an inductance value can be varied depending on a relative positional relationship between the fixed substrate and the rotating body. A semi-fixed electronic component, characterized in that a plurality of projecting portions composed of a vertical surface and an inclined surface inclined from its apex are provided around the surface of the moving body. 2. The semi-fixed electronic component according to claim 1, wherein a vertical surface of the protruding portion is arranged in parallel with a vertical surface of any one of the other protruding portions.