CN218996455U

CN218996455U - Thick film resistor

Info

Publication number: CN218996455U
Application number: CN202220880488.1U
Authority: CN
Inventors: 叶云强; 罗鑫荣
Original assignee: Fujian Meixinda Electronic Technology Co ltd
Current assignee: Fujian Meixinda Electronic Technology Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2023-05-09
Anticipated expiration: 2032-04-15

Abstract

The utility model relates to the technical field of resistors. The utility model discloses a thick film resistor, which comprises a columnar insulating main body and a first conductive cap and a second conductive cap which are arranged at a first end and a second end of the insulating main body in a covering mode, wherein the outer peripheral surface of the insulating main body is covered with a resistor pattern, a resistor fine etching area and an electrode, the electrode comprises a first electrode and a second electrode, the first electrode and the second electrode are respectively positioned at the first end and the second end of the insulating main body, the resistor pattern is positioned between the first electrode and the second electrode, the first connecting end of the resistor pattern is electrically connected with the first electrode through the resistor fine etching area, the second connecting end of the resistor pattern is electrically connected with the second electrode, the first electrode and the second electrode are respectively electrically connected with the first conductive cap and the second conductive cap, the resistor fine etching area comprises a strip resistor piece which extends along the circumferential direction of the outer peripheral surface of the insulating main body, the first side edge of the resistor piece, which faces the first end of the insulating main body, and the first connecting end of the resistor pattern is electrically connected with one end part of the resistor piece, which faces the second side edge of the second end of the insulating main body.

Description

Thick film resistor

Technical Field

The utility model belongs to the technical field of resistors, and particularly relates to a thick film resistor.

Background

The thick film resistor is mainly a resistor formed by screen printing. The resistor paste is paved on an alumina ceramic matrix through screen printing, and the common thick film resistor is formed by adopting metallic ruthenium resistor paste for printing and sintering. The resistor paste comprises ruthenium oxide, an organic solvent and glass powder. The most commonly used thick film resistors are planar and cylindrical. The resistance and the power of the resistor are determined by the thickness and the pattern of the resistor slurry paved on the alumina ceramic matrix, and the dispersion of the resistance of all the resistors just sintered is very large and cannot meet the precision requirement. Therefore, the conventional thick film resistor is generally designed to be smaller than a calibrated resistance value, and then the resistance value is gradually increased by burning a preset resistance shorting wire of a resistance pattern so as to reach the preset resistance value. The precision of the resistance value of the existing thick film resistor is determined by the resistor shorting wire, the precision is lower, and along with the development of scientific technology, the precision of the high-voltage thick film resistor is required in the market especially in the fields of new energy and high-voltage intelligent power equipment, and the existing thick film resistor structure cannot meet the requirements.

Disclosure of Invention

The utility model aims to provide a thick film resistor with high precision to solve the technical problems.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a thick film resistor comprises a columnar insulating main body, a first conductive cap and a second conductive cap which are respectively arranged at a first end and a second end of the insulating main body in a covering mode, a resistor pattern, a resistor fine etching area and an electrode are covered on the peripheral surface of the insulating main body, the electrode comprises a first electrode and a second electrode, the first electrode and the second electrode are respectively arranged at the first end and the second end of the insulating main body, the resistor pattern is arranged between the first electrode and the second electrode, the first connecting end of the resistor pattern is electrically connected with the first electrode through the resistor fine etching area, the second connecting end of the resistor pattern is electrically connected with the second electrode, the first electrode and the second electrode are respectively electrically connected with the first conductive cap and the second conductive cap, the resistor fine etching area comprises a strip-shaped resistor piece which extends along the peripheral surface of the insulating main body, the first side edge of the resistor piece, which faces the first end of the insulating main body, is electrically connected with the first electrode, and the first connecting end of the resistor pattern is electrically connected with one end part of the resistor piece, which faces the second side edge of the second end of the insulating main body.

Further, the resistor pattern includes a plurality of non-closed resistor wires extending circumferentially along the outer circumferential surface of the insulating body, the plurality of resistor wires being sequentially arranged at intervals along the direction from the first end to the second end of the insulating body, and ends of the plurality of resistor wires being sequentially connected to sequentially connect the plurality of resistor wires in series.

Furthermore, the end connection of the adjacent resistance wires is connected by adopting arc resistance wires.

Further, the interval between adjacent resistance wires is not less than 3.0mm.

Further, the resistor pattern further includes a plurality of resistor shorting lines connected between adjacent resistor lines.

Further, the insulating main body is an alumina ceramic rod.

Further, the conductive cap is a metal cap.

Further, the conductive cap is fixed with the insulating body through interference fit.

Furthermore, the conductive cap cover is also provided with a screw hole.

Further, the resistor pattern, the resistor micro-etched region and the electrode are coated on the outer circumferential surface of the insulating body by printing.

The beneficial technical effects of the utility model are as follows:

the utility model can realize the random change of the resistance value of the thick film resistor in a certain range by additionally arranging the resistor fine etching area, and has high resistance value precision, simple structure, easy realization and low cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of an embodiment of the present utility model;

FIG. 2 is a block diagram of another view of an embodiment of the present utility model;

FIG. 3 is a block diagram of another view of an embodiment of the present utility model;

FIG. 4 is a partially exploded view of an embodiment of the present utility model;

FIG. 5 is a schematic view showing the structure of the resistor pattern, the resistor micro-etched region and the electrode developed into a plane according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of fine tuning of resistance values according to an embodiment of the present utility model.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The utility model will now be further described with reference to the drawings and detailed description.

As shown in fig. 1-5, a thick film resistor includes a columnar insulating body 1, and a first conductive cap 21 and a second conductive cap 22 respectively covering a first end and a second end of the insulating body 1, in this embodiment, the insulating body 1 is preferably in a cylindrical structure, and the structure is more reasonable and compact, and the use effect is better, but not limited thereto, and in some embodiments, the insulating body 1 may also be in other shapes such as an elliptic cylinder.

In this embodiment, the insulating body 1 is preferably an alumina ceramic rod, which has good insulation and heat dissipation properties, good mechanical strength, and light weight, but is not limited thereto, and in some embodiments, the insulating body 1 may be made of other insulating materials, such as an epoxy resin material, and the like.

In this embodiment, the first conductive cap 21 and the second conductive cap 22 are metal caps, such as nickel-plated copper caps, which have good electrical conductivity, good mechanical strength, and easy manufacturing, but are not limited thereto, and in some embodiments, the first conductive cap 21 and the second conductive cap 22 may be made of other conductive materials, such as aluminum materials.

Preferably, in this embodiment, the first conductive cap 21 and the second conductive cap 22 are fixed with the first end and the second end of the insulating main body 1 respectively through interference fit, which is simple in structure, easy to assemble, and better in connection stability, and the electrical connection effect between the first conductive cap 21 and the second conductive cap 22 and the first electrode 51 and the second electrode 52 is better, but not limited thereto, and in some embodiments, the first conductive cap 21 and the second conductive cap 22 may be fixed by adopting other fixing manners such as bonding, welding, etc.

In this embodiment,

screw holes

211 and 221 are further formed in the first conductive cap 21 and the second conductive cap 22, so that subsequent connection is facilitated.

The outer peripheral surface of the insulating body 1 is covered with a resistor pattern 3, a resistor micro-etching area 4 and an electrode, the electrode comprises a first electrode 51 and a second electrode 52, the first electrode 51 and the second electrode 52 are respectively positioned at the first end and the second end of the insulating body 1, the resistor pattern 3 is positioned between the first electrode 51 and the second electrode 52, the first connecting end 311 of the resistor pattern 3 is electrically connected with the first electrode 51 through the resistor micro-etching area 4, the second connecting end 312 of the resistor pattern 3 is electrically connected with the second electrode 52, and the first electrode 51 and the second electrode 52 are respectively contacted with the inner walls of the first conductive cap 21 and the second conductive cap 21 to be electrically connected.

The resistor micro-etched area 4 includes an elongated resistor 41 extending along the circumferential direction of the outer circumference of the insulating body 1, wherein the first side 411 of the resistor 41 facing the first end of the insulating body 1 is electrically connected to the first electrode 51, and the first connection end 311 of the resistor pattern 3 is electrically connected to one end (defined as the tail end in the present embodiment) of the second side 412 of the resistor 41 facing the second end of the insulating body 1, and the first connection end 311 of the resistor pattern 3 is spaced from the first electrode 51, i.e. the width of the resistor 41 along the axial direction of the insulating body 1 is greater than the width of the first connection end 311 of the resistor pattern 3.

In this embodiment, the resistor pattern 3 includes a plurality of non-closed resistor wires 31 extending circumferentially along the outer peripheral surface of the insulating body 1 and a plurality of resistor shorting wires 32, the plurality of resistor wires 31 are sequentially arranged at intervals along the first end to the second end of the insulating body 1, the ends of the plurality of resistor wires 31 are sequentially connected to make the plurality of resistor wires 31 sequentially connected in series, the resistor shorting wires 32 are connected between adjacent resistor wires 31 for performing coarse adjustment of the resistance, and as shown in fig. 5, a more specific structure can refer to the resistor pattern of the existing columnar thick film resistor, which is not described in detail.

Preferably, in this embodiment, the end portions of the adjacent resistive wires 31 are connected by arc resistive wires 33, which is easier to process, and the resistive wires are more uniform, so as to reduce the heat generation amount, compared to the conventional linear resistive wire connection.

Preferably, the interval d1 between adjacent resistance wires 31 is not less than 3.0mm, improving heat dissipation and insulation properties. In the present embodiment, the interval d1 between adjacent resistor lines 31 is 3.40mm, but not limited thereto.

In the present embodiment, the resistor pattern 3, the resistor micro-etched region 4, the first electrode 51, and the second electrode 52 are all coated on the outer peripheral surface of the insulating body 1 by printing. The resistor pattern 3 and the resistor micro-etched region 4 may be printed with a resistor paste such as a metallic ruthenium-based resistor paste, and the first electrode 51 and the second electrode 52 may be printed with a conductive paste such as a conductive silver paste.

When the resistance is adjusted, the resistor shorting bar 32 of the resistor pattern 3 can be first burned to perform rough adjustment, when the resistance is close to a preset resistance, the grooves 6 are burned inwards at the tail end part of the resistor fine-etched area 4 between the first connecting end 311 of the resistor pattern 3 and the first electrode 51 by fine laser, as shown in fig. 6, by controlling the depth of the grooves 6 (the depth of the grooves 6 can be adjusted randomly within the length range of the resistor 41), so that the resistance can be accurately controlled (namely, stepless adjustment), and the high-precision thick film resistor is obtained.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A thick film resistor, characterized by: the resistor comprises a columnar insulating main body, a first conductive cap and a second conductive cap which are respectively arranged at a first end and a second end of the insulating main body in a covering mode, a resistor pattern, a resistor fine etching area and an electrode are covered on the peripheral surface of the insulating main body, the electrode comprises a first electrode and a second electrode, the first electrode and the second electrode are respectively arranged at the first end and the second end of the insulating main body, the resistor pattern is arranged between the first electrode and the second electrode, a first connecting end of the resistor pattern is electrically connected with the first electrode through the resistor fine etching area, a second connecting end of the resistor pattern is electrically connected with the second electrode, the first electrode and the second electrode are respectively electrically connected with the first conductive cap and the second conductive cap, the resistor fine etching area comprises a strip resistor piece which extends along the peripheral surface of the insulating main body in a circumferential direction, a first side edge of the resistor piece, which faces the first end of the insulating main body, is electrically connected with the first electrode, and a first connecting end of the resistor pattern is electrically connected with one end part of the resistor piece, which faces the second side edge of the second end of the insulating main body.

2. The thick film resistor of claim 1, wherein: the resistor pattern comprises a plurality of non-closed resistor wires extending along the circumferential direction of the outer circumferential surface of the insulating main body, the resistor wires are sequentially arranged at intervals along the direction from the first end to the second end of the insulating main body, and the end parts of the resistor wires are sequentially connected to enable the resistor wires to be sequentially connected in series.

3. A thick film resistor as claimed in claim 2, wherein: the end connection of adjacent resistance wires adopts circular arc resistance wires to connect.

4. A thick film resistor as claimed in claim 2, wherein: the interval between adjacent resistance wires is not less than 3.0mm.

5. The thick film resistor of claim 4, wherein: the resistor pattern further comprises a plurality of resistor shorting lines connected between adjacent resistor lines.

6. The thick film resistor of claim 1, wherein: the insulating main body is an alumina ceramic rod.

7. The thick film resistor of claim 1, wherein: the conductive cap is a metal cap.

8. The thick film resistor of claim 7, wherein: the conductive cap is fixed with the insulating main body through interference fit.

9. The thick film resistor of claim 8, wherein: the conductive cap cover is also provided with a screw hole.

10. The thick film resistor of claim 1, wherein: the resistor pattern, the resistor fine etched region and the electrode are coated on the outer circumferential surface of the insulating body by printing.