CN214253999U

CN214253999U - Chip resistor and resistor body thereof

Info

Publication number: CN214253999U
Application number: CN202120068151.6U
Authority: CN
Inventors: 胡紫阳; 邓小辉; 李智德
Original assignee: Kunshan Industrial Exhibition Electronics Co ltd
Current assignee: Kunshan Industrial Exhibition Electronics Co ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-09-21
Anticipated expiration: 2031-01-12

Abstract

The application discloses chip resistor and resistive element thereof, it includes a plurality of vertical portions (10), adjacent two be connected with a horizontal part (11) between vertical portion (10), in horizontal part (11), at least one is the fine tuning portion (110) that the width is greater than other horizontal parts (11), the resistive element is through reducing the width adjustment resistance of fine tuning portion (110). According to the resistor body, the widened fine adjustment part is arranged on the resistor body, when the resistance value is finely adjusted, the resistance value of the resistor body can be adjusted only by reducing the width of the fine adjustment part and reducing the sectional area of the fine adjustment part, and the fine adjustment part is wider, so that the resistor body still has good structural strength after fine adjustment, the weak position of a product is optimized, and the electrical performance and reliability of the product are enhanced; and the problems that local overheating is not generated after loading, and the service performance and the service life of the resistor body are influenced are solved.

Description

Chip resistor and resistor body thereof

Technical Field

The application relates to the technical field of resistors, in particular to a chip resistor and a resistor body thereof.

Background

The chip resistor is also called a chip type fixed resistor, has small volume, can greatly save the space cost of a circuit, enables the design to be more refined, and is widely applied to various electronic circuits.

The chip resistor generally includes a resistor body, and in the prior art, when a chip resistor with a larger resistance needs to be produced, the resistor body is generally processed into a shape as shown in fig. 6, so that the resistance is increased. The resistance adjusting patterns are asymmetric left and right, and the sectional areas of each part of the resistor body are approximately the same.

After the resistor body is processed into a shape similar to the S shape shown in fig. 6, the resistance value of the resistor body cannot reach the designed value with a high probability, and the resistor body needs to be finely adjusted. In general, the fine adjustment method is to remove a material on a part of the resistor and reduce the cross-sectional area of the part so that the resistance value of the resistor gradually approaches a designed value. For example, the sectional area of the convex portion 100 may be reduced to make the resistance value of the resistor a design value.

The structure has the defects that after the resistance value is finely adjusted, the section of the resistor body of the finely adjusted part is smaller than that of other parts, so that the heat of the finely adjusted part is more concentrated than that of the other parts in the loading process of the resistor, the finely adjusted part is very fragile, and the temperature is very high; meanwhile, the smaller sectional area of the fine adjustment part directly causes the strength of the chip resistor to be poorer than that of other parts, a new fragile part is formed, and the performance of a chip resistor product is reduced.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the technology, the application provides the method for processing the resistor body of the chip resistor, and the resistor body processed by the method cannot be locally overheated when being loaded and has better structural performance.

In order to solve the above technical problem, in one aspect, the present application provides a resistor body, which includes a plurality of vertical portions, a horizontal portion is connected between two adjacent vertical portions, at least one of the horizontal portions is a fine adjustment portion having a width greater than that of the other horizontal portions, and the resistor body adjusts a resistance value by reducing the width of the fine adjustment portion.

Further, the width of the fine adjustment part is greater than the width of the vertical part.

Further, except for two vertical portions located at the outermost side of the resistor body, the widths of the remaining vertical portions are the same as the widths of the horizontal portions except for the fine adjustment portion.

Further, the vertical portion has the same width as the horizontal portion except for the fine adjustment portion.

Further, the resistor body is symmetrical about an axis of symmetry.

Further, the distances between two adjacent vertical portions are the same.

Further, an outer side surface of the fine adjustment portion is flush with a side surface of the resistor body, and a width of the fine adjustment portion is reduced by removing a material of an inner side surface of the fine adjustment portion.

On the other hand, the present application also proposes a chip resistor including the resistor body according to any one of the above.

Further, the chip resistor further includes a first electrode and a second electrode respectively connected to the vertical portions on both sides of the resistor body, and an upper insulating layer covering an upper side of the resistor body and a lower insulating layer covering a lower side of the resistor body.

Further, the material of the upper insulating layer and the lower insulating layer is an insulating resin.

Compared with the prior art, the application has the beneficial effects that: according to the resistor body, the widened fine adjustment part is arranged on the resistor body, when the resistance value is finely adjusted, the resistance value of the resistor body can be adjusted only by reducing the width of the fine adjustment part and reducing the sectional area of the fine adjustment part, and the fine adjustment part is wider, so that the resistor body still has good structural strength after fine adjustment, the weak position of a product is optimized, and the electrical performance and reliability of the product are enhanced; and the problems that local overheating is not generated after loading, and the service performance and the service life of the resistor body are influenced are solved. In addition, the resistor bodies are arranged in a symmetrical mode, so that parasitic inductance generated by the resistor bodies can be effectively eliminated, the use performance is further optimized, and the use limit of the chip resistor is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a schematic cross-sectional view of a chip resistor in the present application.

Fig. 2 is a schematic diagram showing positions of a resistor and an electrode in the present application.

Fig. 3 is a schematic plan view of a resistor according to an embodiment of the present invention, in which the number of fine adjustment portions is one.

Fig. 4 is a schematic plan view of a resistor according to an embodiment of the present invention, in which the number of fine adjustment portions is two.

Fig. 5 is a schematic plan view of a resistor according to an embodiment of the present application, in which distances between adjacent two vertical portions are different.

Fig. 6 is a schematic plan view of a resistor in the related art.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "comprising" and "having," as well as any variations thereof, in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in fig. 1 and 2, a chip resistor according to a preferred embodiment of the present invention includes a resistor body 1, first and second electrodes 2 and 3 connected to both ends of the resistor body 1, and upper and lower insulating layers 4 and 5 covering upper and lower ends of the resistor body 1.

As shown in fig. 3, the resistor body 1 includes a plurality of vertical portions 10 vertically arranged, a horizontal portion 11 is connected between two adjacent vertical portions 10, two adjacent horizontal portions 11 are alternately arranged up and down, the horizontal portion 11 at the upper end is connected between the upper ends of the two vertical portions 10, and the horizontal portion 11 at the lower end is connected between the lower ends of the two vertical portions 10, so that the resistor body 1 as a whole has a square wave shape. For the sake of clarity of description, the boundary of the horizontal portion 11 and the vertical portion 10 is shown in fig. 3 to 5 by a dotted line.

The two vertical portions 10 located at both sides of the resistor body 1 are used to be connected to two electrodes of the chip resistor, and for convenience of description, the two vertical portions 10 located at both sides will be hereinafter referred to as a first substrate 12 and a second substrate 13, respectively, and the first substrate 12 and the second substrate 13 are connected to the first electrode 2 and the second electrode 3 of the chip resistor, respectively.

In order to provide better performance after the resistor body 1 is finely adjusted, at least one horizontal portion 11 among the plurality of horizontal portions 11 has a width larger than that of the other horizontal portions 11, and preferably, the width of the other horizontal portions 11 is the same as that of each vertical portion 10. Herein, the width of the horizontal portion 11 refers to the dimension along the X-axis direction in fig. 2, i.e., the dimension indicated by the dimension mark B1; and the width of the vertical section 10 refers to the dimension along the direction indicated by the Y-axis in fig. 2, i.e., the dimension indicated by the dimension B2. Meanwhile, for convenience of description, the widened horizontal portion 11 is referred to as a fine adjustment portion 110.

Since the first substrate 12 and the second substrate 13 are directly connected to the electrodes of the chip resistors, their widths do not greatly affect the overall performance, and therefore, the widths of the first substrate 12 and the second substrate 13 may be smaller than the widths of the remaining vertical portions 10 to save materials.

Since the thickness of the resistor body 1 is the same (in this application, the thickness of the resistor body 1 refers to the dimension along the direction of the Z-axis in fig. 1, i.e., the dimension indicated by the dimension D), when the width of the fine adjustment portion 110 is larger than that of the other portions, the cross section thereof is larger than that of the other portions. When the resistance of the resistor body is finely adjusted, the resistance of the resistor body 1 can be gradually changed by only gradually reducing the width of the fine adjustment portion 110, so that the resistance of the resistor body 1 reaches a design value. Because the width of the fine adjustment part 110 is larger than the width of other parts on the resistor body 1, the fine adjustment part can still keep better strength after fine adjustment, a fragile part cannot be formed, and because the fine adjustment part 110 is wider, heat cannot be gathered at the position after electrification, so that local overheating is avoided, and the reliable use of the resistor body 1 is facilitated.

Preferably, after fine adjustment, the width of the fine adjustment portion 110 is still larger than that of the rest of the resistor body 1, so as to ensure better structural performance.

As shown in fig. 3, the elongated groove 14 is formed between the fine adjustment portion 110 and the two vertical portions 10 on both sides thereof, and as a preferred embodiment, the outer side surface 11a of the fine adjustment portion 110 is flush with the side surface 1a of the entire resistor body 1, and the fine adjustment portion 110 is located in the elongated groove 14 with more material than the other horizontal portions 11, and thus has a larger width, and fig. 3 shows a portion of the fine adjustment portion 110 having a wider width than the other horizontal portions 11 in a new cross-sectional form. When the resistance is finely adjusted, the resistance value is adjusted by removing the material of the fine adjustment portion 110 located in the long groove 14, and the length of the long groove 14 is increased after the fine adjustment.

As a preferred embodiment, the resistor body 1 is symmetrical, and both sides thereof are symmetrical about the symmetry axis 6, and correspondingly, the fine adjustment part 110 is also symmetrical about the symmetry axis 6, and as shown in fig. 2, when there is one fine adjustment part 110, it is disposed at the middle position of the resistor body 1, and is symmetrical about the symmetry axis 6; as shown in fig. 4, when the number of the fine adjustment portions 110 is two, the two fine adjustment portions 110 are symmetrically disposed on both sides of the symmetry axis 6, and during fine adjustment, the material on the fine adjustment portions 110 is symmetrically removed, so that the resistor body 1 is still symmetrical after the fine adjustment is completed. This has the advantage that the parasitic inductance is easily generated due to the large number of turns of the resistor 1, and the parasitic inductance generated by the symmetrical arrangement can be offset to the left and right, thereby reducing the use limit of the resistor.

Further, the distances between two adjacent vertical portions 10 may be the same or different, but the resistor body 1 is symmetrical as a whole. Fig. 4 shows a possible structure in which the distance between two adjacent uprights 10 is the same, and fig. 5 shows a possible structure in which the distance between two adjacent uprights 10 is not the same. Preferably, the distance between adjacent two of the upright portions 10 is the same.

The first electrode 2, the second electrode 3, the upper insulating layer 4, the lower insulating layer 5, etc. of the chip resistor can refer to the structure of the chip resistor in the prior art, for example, the first electrode 2 and the second electrode 3 can be composed of a plurality of parts, for example, they can include a face electrode, a terminal electrode, an intermediate electrode, an external electrode, etc., the lower insulating layer 5 can be a ceramic substrate, and the upper insulating layer 4 can be glass, etc.

In this embodiment, the upper insulating layer and the lower insulating layer are made of insulating resin.

A method for processing a chip resistor body comprises the following steps:

s1, coarse forming: forming a resistor body 1, wherein the resistor body 1 is the above resistor body and comprises a plurality of vertical parts 10 which are vertically arranged and horizontal parts 11 which are connected between two adjacent vertical parts 10, and at least one of the horizontal parts 11 is a fine adjustment part 110 with the width larger than that of the other horizontal parts 11;

in step S1, the resistor may be directly punched out in a square wave shape by a punch, or may be formed by other methods such as laser cutting.

In step S1, the resistor body 1 is preliminarily formed through theoretical calculation or practical experience, and preferably, the resistance value of the resistor body 1 which is roughly formed is smaller than a required design value, so that the resistance value can be increased to the design value after fine adjustment.

S2, fine resistance adjustment: the material on the fine tuning section 110 is gradually removed, and the width of the fine tuning section 110 is reduced until the resistance value of the resistor 1 reaches a set value.

In step S2, the material of the fine adjustment part 110 may be removed by using a mechanical resistance grinding machine or a laser resistance trimming machine.

As a preferable embodiment, in step S2, the material to be removed is the portion of the fine adjustment portion 110 located in the long groove 14, for example, the material having a certain thickness on the inner side surface 11b of the fine adjustment portion 110 located in the long groove 14 may be removed each time, for example, the material having a thickness value H may be removed, and the actual resistance value of the resistor 1 may be detected by a resistance adjusting device such as a mechanical resistance grinding machine or a laser resistance adjusting machine, and the thickness value H may be adjusted according to the deviation of the actual resistance value from the design value, and usually, the thickness value removed each time is gradually reduced according to the reduction of the deviation.

In a preferred embodiment, the resistor 1 formed in step S1 is symmetrical, and the number of the fine adjustment portions 110 is 1 or more. Further, in step S2, the material on the fine adjustment portion 110 is symmetrically removed, and the width of the fine adjustment portion 1a is reduced, so that when the fine adjustment is completed, the resistor body 1 is still symmetrical, and the parasitic inductances on both sides of the resistor body 1 can be offset. The material on the fine adjustment portion 110 may be removed symmetrically, for example, the material with a certain thickness value on the fine adjustment portion 110 on the left side of the symmetry axis 6 may be removed first, and then the material with a certain thickness value on the fine adjustment portion 110 on the right side of the symmetry axis 6 may be removed; it is also possible to remove material of a certain thickness value on all fine adjustments 110 simultaneously.

According to the resistor body, the widened fine adjustment part is arranged on the resistor body, when the resistance value is finely adjusted, the resistance value of the resistor body can be adjusted only by reducing the width of the fine adjustment part and reducing the sectional area of the fine adjustment part, and the fine adjustment part is wider, so that the resistor body still has good structural strength after fine adjustment, the weak position of a product is optimized, and the electrical performance and reliability of the product are enhanced; and the problems that local overheating is not generated after loading, and the service performance and the service life of the resistor body are influenced are solved. In addition, the resistor bodies are arranged in a symmetrical mode, so that parasitic inductance generated by the resistor bodies can be effectively eliminated, the use performance is further optimized, and the use limit of the chip resistor is reduced.

The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent structures or equivalent processes that can be used directly or indirectly in other related fields of technology shall be encompassed by the present invention.

Claims

1. A resistor body comprises a plurality of vertical parts (10), a horizontal part (11) is connected between every two adjacent vertical parts (10), and the resistor body is characterized in that at least one of the horizontal parts (11) is a fine adjustment part (110) with the width larger than that of the other horizontal parts (11), and the resistance of the resistor body is adjusted by reducing the width of the fine adjustment part (110).

2. The resistor body according to claim 1, wherein the width of the fine adjustment portion (110) is larger than the width of the vertical portion (10).

3. The resistor body according to claim 2, wherein the widths of the remaining vertical portions (10) are the same as the widths of the horizontal portions (11) except for the fine adjustment portion (110), except for two vertical portions (10) located at the outermost side of the resistor body.

4. The resistor body according to claim 2, wherein the vertical portion (10) has the same width as the horizontal portion (11) except for the fine adjustment portion (110).

5. The resistive body according to claim 1, characterized in that it is symmetrical about an axis of symmetry (6).

6. The resistor body according to claim 5, wherein the distance between two adjacent vertical portions (10) is the same.

7. The resistor body according to claim 1, wherein an outer side surface (11a) of the fine adjustment portion (110) is flush with a side surface (1a) of the resistor body (1), and a width of the fine adjustment portion (110) is reduced by removing a material of an inner side surface (11b) of the fine adjustment portion (110).

8. A chip resistor comprising the resistor body according to any one of claims 1 to 6.

9. The chip resistor according to claim 8, further comprising a first electrode (2) and a second electrode (3) respectively connected to the vertical portions (10) on both sides of the resistor body, and an upper insulating layer (4) covering the upper side of the resistor body (1), and a lower insulating layer (5) covering the lower side of the resistor body (1).

10. A chip resistor according to claim 9, characterized in that the material of the upper insulating layer (4) and the lower insulating layer (5) is an insulating resin.