CN112802643A

CN112802643A - Sealed precision chip type fixed resistor and manufacturing method thereof

Info

Publication number: CN112802643A
Application number: CN202010765343.2A
Authority: CN
Inventors: 曾炀; 李强; 王晓磊; 齐雷; 韩丽娜; 张鑫凯
Original assignee: BEIJING 718 YOUSHENG ELECTRONICS CO LTD
Current assignee: BEIJING 718 YOUSHENG ELECTRONICS CO LTD
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-05-14

Abstract

The invention discloses a sealed precision chip type fixed resistor and a manufacturing method thereof, belonging to the field of precision chip resistors. This sealed accurate piece formula fixed resistor contains tube, resistor chip and apron, and the tube has cavity structures and upper surface and is equipped with metal seal ring, and the resistor chip is installed in the tube cavity, and the circuit intercommunication of chip electrode and tube, apron welding are in order to realize the gas tightness encapsulation on the metal seal ring of tube. The resistor chip is protected in the closed cavity of the tube shell and isolated from the external environment, so that the resistor chip can be prevented from being damaged by oxidation, corrosion, mechanical damage and the like, and better moisture resistance and long-term stability are obtained.

Description

Sealed precision chip type fixed resistor and manufacturing method thereof

Technical Field

The invention relates to the field of electronic components, in particular to a sealed precision chip type fixed resistor.

Background

In practical applications, the fixed resistor is affected by external environment, such as oxidation of oxygen, corrosion of moisture and corrosive gases, mechanical damage due to external stress, and the like. The precision, stability and life of the fixed resistor are seriously damaged due to the influence of severe external environment, and the fixed resistor is a great reason for the failure of the fixed resistor. A stable and reliable working environment is formed in a sealed shell of the sealed precision chip type fixed resistor, the resistor chip can be free from the influence of the external environment when working in the sealed precision chip type fixed resistor, and compared with the traditional chip type fixed resistor, the product has the advantages of high precision, small temperature coefficient, good moisture resistance, good long-term stability and the like.

Disclosure of Invention

The invention aims to provide a sealed precise chip type fixed resistor and a manufacturing method thereof, which realize the isolation of a resistor chip from the external environment and improve the moisture resistance and long-term stability of the fixed resistor.

The invention provides a sealed precise chip type fixed resistor which comprises a tube shell, a resistor chip (a chip type alloy foil fixed resistor chip, a chip type thin film fixed resistor chip, a chip type wire-wound fixed resistor chip or a chip type fixed resistor network chip) and a cover plate. Wherein, the tube has cavity structures and the upper surface is equipped with metal seal ring, and the resistor chip is installed in the tube cavity, and the apron welds on the metal seal ring of tube.

The invention is realized by the following technical scheme:

firstly, installing a resistor chip in a cavity of a tube shell;

then, the electrodes of the resistor chip are brought into communication with the in-package circuit.

And finally, the cover plate is welded on the metal sealing ring of the tube shell to realize air-tight packaging.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the present invention.

In fig. 2, 1 denotes a package, 2 denotes a metal seal ring on the upper surface of the package, 3 denotes a resistor chip, 4 denotes an insulating paste, and 5 denotes a cover plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. Other embodiments, which can be derived by one of ordinary skill in the art from the embodiments of the present invention without creative efforts, are also within the scope of the present invention.

Fig. 1 is a schematic structural diagram of an external shape according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a cross-section according to an embodiment of the present invention. Referring to fig. 1 and 2, the sealed precision chip-type fixed resistor includes a case 1, a resistor chip 3, and a cover plate 5. Wherein, the tube shell 1 is made of ceramic material and has a cavity structure, and the upper surface thereof is provided with a metal sealing ring 2; the resistor chip 3 is arranged in the cavity of the tube shell 1 through the insulating glue 4, and the electrode of the resistor chip is connected with the bonding pad in the cavity of the tube shell 1; the cover plate 6 is welded on the metal sealing ring 2, so that the resistor chip 3 is packaged to form the sealed precision chip type fixed resistor.

The specific manufacturing steps of the sealed precision chip type fixed resistor are as follows:

1. dripping a proper amount of insulating glue 4 into a chip mounting area in a cavity of the tube shell 1 which is subjected to vacuum baking degassing treatment, and sticking the resistor chip 3 in the tube shell 1 through the insulating glue 4;

2. connecting the electrode of the resistor chip 3 with a bonding pad inside the tube shell 1 to realize the communication between the electrode of the resistor chip 3 and the circuit inside the tube shell 1;

3. the cover plate 5 covers the metal sealing ring 2 on the upper surface of the pipe shell, and the cover plate and the metal sealing ring form a closed cavity in a welding mode.

Finally, it should be noted that: the above-described embodiments are intended to be illustrative of the present invention, rather than restrictive, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Sealed accurate piece formula fixed resistor, its characterized in that includes tube, resistor chip and apron, the tube has cavity structures and is provided with the circuit, the resistor chip is installed in the cavity of tube, the resistor chip communicates with the interior circuit of tube, the apron lid closes the upper surface of tube to be used for encapsulating the resistor chip in the tube to form sealed accurate piece formula fixed resistor.

2. The sealed precision chip fixed resistor of claim 1, wherein the package is made of ceramic, a metal sealing ring is disposed on the top surface of the package, and the cover plate is welded to the metal sealing ring.

3. The sealed precision chip fixed resistor of claim 1, wherein the resistor chip is a chip alloy foil fixed resistor chip, a chip thin film fixed resistor chip, a chip wire-wound fixed resistor chip or a chip fixed resistor network chip.

4. The sealed precision chip fixed resistor of claim 1, wherein the resistor chip is attached to the cavity of the package by an insulating adhesive.

5. The sealed precision chip fixed resistor of claim 1, wherein the electrodes of the resistor chip are connected to bonding pads inside the package to communicate the resistor chip with the circuitry inside the package.

6. The sealed precision chip fixed resistor of claim 1, wherein the packaging of the resistor chip is in a sealed form.