Low-stress lead ceramic insulator sealing structure

Abstract

The utility model discloses a low-stress lead ceramic insulator sealing structure, which comprises a ceramic insulator and a lead, an inner sealing ring is arranged at the left end of the ceramic insulator, an outer sealing ring is arranged at the right end of the ceramic insulator, the inner sealing ring is conical, the outer sealing ring is cylindrical, a sealing hole is arranged in the ceramic insulator, and the lead is arranged in the sealing hole. The lead is installed in the sealing hole and connected with the inner sealing ring and the outer sealing ring respectively, and the inner sealing ring and the outer sealing ring are welded to the two ends of the ceramic insulator with the lead as the axis. Through the structure, the metalized layer, the inner sealing ring, the outer sealing ring and the lead are connected with one another to form a symmetrical sealing structure, the sealing stress is small, the sealing strength is high, the service life of a product is prolonged, and the safety of the product is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic packaging, in particular to a low-stress lead ceramic insulator sealing structure. Background Art

[0002] In the prior art, the microelectronic packaging shell generally uses metal as the shell body, and the lead is led out after being welded with the ceramic insulator. The inside and outside end faces of the ceramic insulator sealing hole are covered with a metallization layer, while the inside end face has no metallization layer. The lead is connected to the ceramic insulator through the metallization layer in the sealing hole and the metallization layer on the outside end face. Due to the different thermal expansion coefficients of the lead and the ceramic, welding stress will be generated at the welding part between the lead and the ceramic. In addition, the lead will be bent by force during assembly and use, and the sealing stress is unevenly distributed, which will also increase the risk of cracking at the welding part between the lead and the ceramic insulator, reducing the sealing reliability; therefore, a low-stress lead ceramic insulator sealing structure is proposed. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a low-stress lead ceramic insulator sealing structure, which solves the problem that the lead wire passes through the sealing hole of the ceramic insulator and the metallized layer that fully covers the lead wire and the outer end surface metallized layer are connected to the ceramic insulator, resulting in large sealing stress, which causes deformation of the lead wire during assembly and use.

[0004] The utility model also provides a low-stress lead ceramic insulator sealing structure, comprising a ceramic insulator and a lead, wherein an inner sealing ring is provided at the left end of the ceramic insulator, and an outer sealing ring is provided at the right end, wherein the inner sealing ring is conical, and the outer sealing ring is cylindrical, a sealing hole is provided in the ceramic insulator, the lead is installed in the sealing hole, and is respectively connected to the inner sealing ring and the outer sealing ring, and the inner sealing ring and the outer sealing ring are welded to both ends of the ceramic insulator with the lead as the axis.

[0005] According to the described low-stress lead ceramic insulator sealing structure, the two ends of the ceramic insulator are respectively an inner end face and an outer end face, the inner end face and the outer end face are both covered with a metallization layer, the inner sealing ring is interconnected with the metallization layer of the inner end face, and the outer sealing ring is interconnected with the metallization layer of the outer end face.

[0006] According to the low-stress lead ceramic insulator sealing structure, the sealing hole is a through-slot-shaped hole and passes through both inner and outer ends of the ceramic insulator.

[0007] According to the low-stress lead ceramic insulator sealing structure, the ceramic insulator is cylindrical as a whole, and both ends are cylindrical or conical, or one end is conical and the other end is cylindrical.

[0008] According to the low-stress lead ceramic insulator sealing structure, the ceramic insulator is made of alumina ceramic, the sealing hole is located in the middle, the lead is made of zirconium-copper alloy, and the inner sealing ring and the outer sealing ring are both made of Kovar alloy.

[0009] The utility model has the following beneficial effects:

[0010] In the utility model, a metallized layer is coated on both ends of the ceramic insulator, and the metallized layer, inner and outer sealing rings and lead wires are connected to each other to form a symmetrical sealing structure with small sealing stress and high sealing strength. The sealing stress can be evenly distributed to both ends of the ceramic insulator, thereby reducing the risk of cracking of the ceramic insulator and the welding parts during subsequent use, which not only improves the service life of the product, but also enhances its safety.

[0011] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0013] Figure 1 This is a structural diagram of a low stress lead ceramic insulator sealing structure of the utility model;

[0014] Figure 2 This is a cross-sectional view of a sealing structure of a low-stress lead ceramic insulator of the utility model.

[0015] Legend:

[0016] 1. Ceramic insulator; 2. Inner sealing ring; 3. Outer sealing ring; 4. Lead wire; 5. Inner end face; 6. Outer end face; 7. Sealing hole. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0018] Reference Figure 1-2, the utility model embodiment is a low stress lead ceramic insulator sealing structure, which includes a ceramic insulator 1 and a lead 4, the ceramic insulator 1 is cylindrical as a whole, and both ends are cylindrical, conical, or one end is conical and the other end is cylindrical, the left end of the ceramic insulator 1 is provided with an inner sealing ring 2, and the right end is provided with an outer sealing ring 3, the inner sealing ring 2 is conical, and the outer sealing ring 3 is cylindrical (the inner and outer sealing rings can be selected according to the end face shape of the ceramic insulator 1), the ceramic insulator 1 is made of alumina ceramic, the sealing hole 7 is located in the middle, the lead 4 is made of zirconium-copper alloy, and the inner sealing ring 2 and the outer sealing ring 3 are both made of Kovar alloy;

[0019] A sealing hole 7 is provided in the ceramic insulator 1. The sealing hole 7 is a through-groove-shaped hole and passes through both ends of the ceramic insulator 1. A lead wire 4 is installed in the sealing hole 7 and is connected to the inner sealing ring 2 and the outer sealing ring 3 respectively. The inner sealing ring 2 and the outer sealing ring 3 are welded to both ends of the ceramic insulator 1 with the lead wire 4 as the axis.

[0020] The two ends of the ceramic insulator 1 are an inner end face 5 and an outer end face 6, both of which are covered with a metallized layer. The inner sealing ring 2 is connected to the metallized layer of the inner end face 5, and the outer sealing ring 3 is connected to the metallized layer of the outer end face 6.

[0021] Working principle: When in use, the ceramic insulator 1 is sleeved on the lead 4, and then the welding position of the ceramic insulator 1 and the lead 4 is adjusted by sliding, and then the inner end face 5 and the outer end face 6 of the ceramic insulator 1 are coated with a metallized layer, and the metallized layer is connected to the lead 4, and then the inner sealing ring 2 and the outer sealing ring 3 are coaxially sleeved on the outer circumference of the lead 4, and respectively attached to the inner and outer end faces of the ceramic insulator 1 (the metallized layer has the same cross-sectional area as the inner sealing ring 2 and the outer sealing ring 3), so that the metallized layer, the inner and outer sealing rings and the lead 4 are interconnected to form a symmetrical sealing structure with small sealing stress and high sealing strength. The sealing stress can be evenly distributed to the two ends of the ceramic insulator 1, thereby reducing the risk of cracking of the ceramic insulator 1 and the welding parts during subsequent use, which not only improves the service life of the product, but also enhances its safety.

[0022] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A low stress lead ceramic insulator sealing structure, characterized in that: include: A ceramic insulator (1) and a lead wire (4), wherein the ceramic insulator (1) is provided with an inner sealing ring (2) at the left end and an outer sealing ring (3) at the right end, wherein the inner sealing ring (2) is conical and the outer sealing ring (3) is cylindrical, wherein a sealing hole (7) is provided in the ceramic insulator (1), wherein the lead wire (4) is installed in the sealing hole (7) and is respectively connected to the inner sealing ring (2) and the outer sealing ring (3), wherein the inner sealing ring (2) and the outer sealing ring (3) are both welded to the two ends of the ceramic insulator (1) with the lead wire (4) as the axis.

2. A low stress lead ceramic insulator sealing structure according to claim 1, characterized in that: The two ends of the ceramic insulator (1) are an inner end face (5) and an outer end face (6), respectively; the inner end face (5) and the outer end face (6) are both covered with a metallized layer; the inner sealing ring (2) is interconnected with the metallized layer of the inner end face (5); and the outer sealing ring (3) is interconnected with the metallized layer of the outer end face (6).

3. A low stress lead ceramic insulator sealing structure according to claim 2, characterized in that: The sealing hole (7) is a through-slot-shaped hole and passes through both inner and outer ends of the ceramic insulator (1).

4. A low stress lead ceramic insulator sealing structure according to claim 3, characterized in that: The ceramic insulator (1) is cylindrical as a whole, and both ends are cylindrical or conical, or one end is conical and the other end is cylindrical.

5. A low stress lead ceramic insulator sealing structure according to claim 4, characterized in that: The ceramic insulator (1) is made of alumina ceramic, the sealing hole (7) is located in the middle, the lead wire (4) is made of zirconium-copper alloy, and the inner sealing ring (2) and the outer sealing ring (3) are both made of Kovar alloy.

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