JP2500370Y2 - Variable electronic components - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention rotatably rotatably mounts a rotor member on the upper surface of an insulating substrate made of ceramics, such as a variable chip resistor, and rotates the rotor member to provide a resistance value. The present invention relates to a variable electronic component adapted to adjust the above.

[0002]

2. Description of the Related Art Generally, a variable chip resistor 20, as shown in FIG. 7, has a through hole 25 formed on an upper surface of a ceramic insulating substrate 22 having through holes 25 opened on both upper and lower surfaces thereof.
A resistance film 26 having a substantially U-shape in a plan view is applied so as to surround the upper surface of the insulating substrate 22, and a rotor member 23 formed of a metal plate in a bowl shape is formed on a portion of the upper surface of the insulating substrate 22 inside the resistance film 26. On the other hand, the rotor member 23 is mounted by inserting the support shaft 24 having the terminal plate 31 at the lower end into the through hole 25, and inserting the upper end of the support shaft 24 into the rotor member 3 and caulking and expanding. Is rotatably pivoted to the insulating substrate 22, and the rotor member 23 is rotated to change the contact position between the contact portion 28 formed on the rotor member 23 and the resistance film 26. The contact portion 28 of 23 and the resistance film 26
It is well known that the resistance value is adjusted by changing the distance between the side electrodes 27 provided at both ends of the.

[0003]

The manufacturing of the insulating substrate 22 is, roughly speaking, as shown in FIG. 8, forming a ceramic material plate A in which a plurality of insulating substrates 22 are connected vertically and horizontally. Then, this is fired in a heating furnace, and then a mask having a print pattern formed thereon is superposed on the upper surface of the ceramic material plate A, a resistance paste is applied to the upper surface of the print mask and scraped off with a squeegee. A resistance film 26 is formed on the upper surface of the ceramic material plate A corresponding to each insulating substrate 22 by mask printing, and then the resistance film 26 is dried and then the vertical and horizontal lines B1 and B2 are formed. It is performed through the process of breaking along.

However, in the process of manufacturing the insulating substrate 22, when the ceramic material plate A is formed and then fired, the ceramic material plate A may contract or warp. When applying 26, as shown by the alternate long and short dash line in FIG. 7 and FIG. 8, the printing pattern on the printing mask and the position of each insulating substrate 22 on the ceramic material plate A are displaced, and the resistance film 2 is formed.
6 may be located on the lower surface of the rotor member 23 or, in extreme cases, may be attached to the inner surface of the through hole 25.

Therefore, the rotor member 23 is attached to the insulating substrate 22.
When the rotor member 23 is pivotally attached to the resistance film 26, the lower surface of the rotor member 23 contacts the resistance film 26, or both the lower surface of the rotor member 23 and the support shaft 24 contact the resistance film 26, so that the resistance value cannot be adjusted. There was a problem that the ratio of defective products was high. An object of the present invention is to make it possible to reliably adjust the resistance value and the like even when the coating position of the adjustment film such as the resistance film is displaced.

[0006]

In order to achieve this object, the present invention provides a control film, such as a resistance film, surrounding the through hole on the upper surface of an insulating substrate having through holes opened on both upper and lower surfaces. In the variable electronic component, which is formed by rotatably pivoting a metal rotor member having a contact portion for the adjusting film, the support rotor shaft being inserted into the through hole. A flange made by inserting a cylindrical body made of an insulating material fitted into the support shaft into the through hole of the insulating substrate, and sandwiching the upper end of the cylindrical body between the upper surface of the insulating substrate and the lower surface of the rotor member. The parts are integrally connected.

[0007]

[Operation and effect of the invention] With this structure, since the support shaft is fitted with the cylindrical body made of an insulator, even if the adjustment film is attached to the inner surface of the through hole, the adjustment film is attached to the adjustment film. It is possible to reliably prevent the support shaft from coming into contact with each other. Further, since the flange portion is provided at the upper end of the tubular body, even if the adjustment film is located on the lower surface of the rotor member, the flange of the tubular body can prevent the lower surface of the rotor member from contacting the adjustment film. It will be possible to surely prevent it.

Therefore, according to the present invention, the rotor member and the support shaft are held in non-contact with the adjusting film even if the coating position of the adjusting film such as the resistance film is deviated from the predetermined position. Therefore, it is possible to surely prevent a defective product from being generated due to the displacement of the adjustment film in the manufacturing process of the insulating substrate, which has the effect of reducing the manufacturing cost of the variable electronic component. .

Further, due to the deviation of the coating position of the adjusting film,
Even when the flange portion of the tubular body is partially in contact with the upper surface of the adjustment film, the tubular body is fitted into the through hole, so that the flange portion is substantially parallel to the upper surface of the insulating substrate. Since the rotor member can be held, the rotor member can be pivotally attached to the insulating substrate without tilting the axis of the rotor member. Therefore, even when the adjustment film coating position is displaced, the rotor member can be held. It also has the effect that it can rotate smoothly.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to a chip variable resistor will be described with reference to the drawings (FIGS. 1 to 4). In the figure, reference numeral 1 is a ceramic insulating substrate 2.
2 shows a chip variable resistor including a rotor member 3 formed of a metal plate in a bowl shape and a support shaft 4 formed of a metal plate. A through hole 5 is bored in a substantially central portion of the insulating substrate 2, and a U-shaped resistance film 6 in plan view is applied to the upper surface of the insulating substrate 2 so as to surround the through hole 5. , Insulating substrate 2
Side electrodes 7, 7 that are electrically connected to both ends of the resistance film 6 are provided on one side edge of the.

Further, the rotor member 3 is formed with a contact portion 8 for the resistance film 6 of the insulating substrate 2 and an engaging groove 9 for a driver for rotating operation, and the through hole 1 is formed in the bottom plate 3a.
0 is drilled. A terminal plate 11 is integrally connected to the support shaft 4. Reference numeral 12 denotes a tubular body fitted to the support shaft 4 and fitted into the through hole 5 of the insulating substrate 2. The tubular body 12 is formed of an insulating material such as synthetic resin, At its upper end, a flange portion 12 having a diameter D2 larger than the outer diameter D1 of the bottom plate 3a of the rotor member 3 is formed.
a is integrally formed, and this flange portion 12a is
The rotor member 3 is pivotally attached to the insulating substrate 2 by swaging the upper end of the support shaft 4 while sandwiching it between the upper surface of the insulating substrate 2 and the bottom plate 3a of the rotor member 3. .

According to this structure, as shown in FIG. 4, even if the coating position of the resistance film 6 deviates from the predetermined position and the resistance film 6 is located at the bottom plate 3a of the rotor member 3, the resistance film Since the flange portion 12a of the cylindrical body 12 made of an insulator is sandwiched between the film 6 and the lower surface of the rotor member 3, it is possible to reliably prevent the rotor member 3 from coming into contact with the resistance film 6. Further, since the cylindrical body 12 made of an insulator is fitted on the support shaft 4, as shown in FIG. 5, even if the resistance film 6 adheres to the inner peripheral surface of the through hole 5, the support shaft 4 does not resist the resistance. The contact with the membrane 6 can be reliably prevented.

As described above, even if the coating position of the resistance film 6 is deviated from the predetermined position, the lower surface of the rotor member 3 and the support shaft 4 are surely prevented from coming into contact with the resistance film 6, and the rotor member 6 is prevented. Since only the contact portion 8 of No. 3 can maintain the state of being in contact with the resistance film 6, the resistance value can be reliably adjusted regardless of the deviation of the coating position of the resistance film 6. Moreover,
Due to the deviation of the coating position of the resistance film 6, even if only a part of the flange portion 12a along the circumferential direction is in contact with the resistance film 6, the tubular body 12 is fitted in the through hole 5. Since the flange portion 12a can be held in a state of being substantially parallel to the upper surface of the insulating substrate 2, the rotor member 3 can be pivotally attached to the insulating substrate 2 by swaging the support shaft 4 when the rotor member 3 is rotated. It is possible to prevent or reduce the inclination of the axis of the rotor member 3, to rotate the rotor member 3 smoothly, and to reliably hold the contact portion 8 in contact with the resistance film 6.

The contact portion 8 of the rotor member 3 is
Since it can be elastically deformed in the vertical direction, even if the flange portion 12a of the cylindrical body 12 overlaps the upper surface of the resistance film 6, the conduction with the resistance film 6 is not impaired. When the tubular body 12 is formed of an elastic material such as synthetic resin as in the embodiment, the flange portion 12a of the tubular body 12 is elastically deformed by the pressing force by the caulking expansion of the support shaft 4 in the state of FIG. The elastic restoring force of the flange portion 12a, which is deformed, acts as an upward pressing force on the rotor member 3, and the contact surface between the lower surface of the rotor member 3 and the caulked portion expansion 4a of the support shaft 4 and the flange. Since it is possible to maintain a state in which a large friction is generated on the contact surface between the portion 12a and the resistance film 6, it is possible to reliably rotate the rotor member 3 to adjust the resistance value, and the rotor member 3 after the adjustment. It has an advantage that it can be surely prevented from loosening.

In this case, if the cylindrical body 12 is made of a material having a large friction coefficient, the loosening prevention function of the rotor member 3 can be further improved. In the above embodiment, the outer diameter D2 of the flange portion 12a of the cylindrical body 12 is set to the bottom plate 3a of the rotor member 3.
The outer diameter 12a is larger than the outer diameter 12a to prevent the lower surface of the rotor member 3 from coming into contact with the resistance film 6. However, in the present invention, as shown in FIG. By forming the thickness t2 of the portion 12a to be larger than the thickness t1 of the resistance film 6 and always positioning the lower surface of the rotor member 3 above the upper surface of the resistance film 6, The lower surface may be prevented from coming into contact with the resistance film 6.

Although each of the above embodiments has been applied to the chip variable resistor, the present invention can be applied to other variable electronic parts such as a chip variable capacitor.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a chip variable resistor according to the present invention.

FIG. 2 is a plan view of a chip variable resistor.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2 in a state where the resistance film is displaced.

FIG. 5 is a diagram showing an operation.

FIG. 6 is a diagram showing another embodiment.

FIG. 7 is an exploded perspective view showing a conventional technique.

FIG. 8 is a diagram showing part of the process of manufacturing the insulating substrate.

[Explanation of symbols]

 1 Chip variable resistor as an example of variable electronic component 2 Insulating substrate 3 Rotor member 4 Support shaft 5 Through hole 6 Resistive film as an example of adjusting film 8 Contact part 12 Cylindrical body 12a Flange part

Claims (1)

(57) [Scope of utility model registration request] 1. An adjustment substrate, such as a resistance film, is coated on the upper surface of an insulating substrate having through holes opened on both upper and lower sides so as to surround the through holes, and a contact portion for the adjustment film is provided. In a variable electronic component in which a metal rotor member having a rotary shaft is rotatably pivoted through a support shaft inserted in the through hole, the through shaft of the insulating substrate is fitted to the support shaft. A variable type in which a tubular body made of an insulating material is inserted and a flange portion that is sandwiched between the upper surface of the insulating substrate and the lower surface of the rotor member is integrally connected to the upper end of the tubular body. Electronic components.