QFN packaging structure and manufacturing method thereof

Abstract

The invention relates to the technical field of QFN packaging, in particular to a QFN packaging structure and a manufacturing method thereof.The QFN packaging structure comprises a QFN packaging body, the bottom of the QFN packaging body is sleeved with a protection cover, a rubber clamping piece is clamped between the protection cover and the QFN packaging body, a shifting piece is inserted into the top face of the protection cover, and a rubber block is fixed to the bottom face of the shifting piece; the packaging structure has the advantages that the bottom of the QFN packaging body is sleeved with the protection cover, the protection cover is of the frame structure with the inner ring opening being the inverted-T-shaped opening, after the top inner ring opening is arranged on the top of the QFN packaging body in a sleeving mode, the top plate is in lap joint with the bottom plate of the QFN packaging body, the four corners are located in the inner ring opening of the bottom of the protection cover, and packaging of the bottom plate of the QFN packaging body is achieved. The wrapping mode can effectively prevent the bottom plate of the QFN packaging body from being broken due to collision of external force when the QFN packaging body is not installed and used, the physical integrity of the QFN packaging body is protected, and the service life of the QFN packaging body is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of QFN packaging, specifically to a QFN packaging structure and its manufacturing method. Background Art

[0002] In the field of electronic packaging, QFN (Quad Flat No-leads) packaging structures are widely used. After the QFN packaging body is packaged, the metal sheet on the bottom surface of its bottom plate is in an exposed state. When the QFN packaging body is not installed and used, the metal sheet on the bottom plate will be exposed to the external environment for a long time. Due to the action of oxygen, moisture and other possible corrosive substances in the air, there is a hidden danger of oxidation of the metal sheet. Once the metal sheet is oxidized, its electrical conductivity will decrease, or even completely lose its conductive function, which will seriously affect the normal use of the QFN packaging body 1, reduce the reliability and stability of electronic products, and bring potential risks to the operation of electronic devices. Summary of the Invention

[0003] The purpose of the present invention is to provide a QFN packaging structure and its manufacturing method to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A QFN packaging structure includes a QFN packaging body. A protective cover is sleeved at the bottom of the QFN packaging body. A rubber clip is clamped between the protective cover and the QFN packaging body. A dial is inserted into the top surface of the protective cover, and a rubber block is fixed to the bottom surface of the dial.

[0005] Preferably, the QFN packaging body is in a "convex" - shaped block, and the protective cover is a frame with an inner ring opening in a "convex" - shaped opening. After the top inner ring of the protective cover is sleeved on the top of the QFN packaging body, the top plate of the protective cover overlaps on the bottom plate of the QFN packaging body, and the four corners of the QFN packaging body are in the bottom inner ring of the protective cover.

[0006] Preferably, the inner wall of the protective cover is provided with mounting grooves at all four corners. The height of the mounting groove is equal to the thickness of the bottom plate of the QFN packaging body. The rubber clips correspond to the mounting grooves one by one. The rubber clips are fixed in the mounting grooves. The inner ring surface of the rubber clip protrudes from the mounting groove. After the protective cover is sleeved on the QFN packaging body, the part of the rubber clip protruding from the mounting groove is squeezed and compressed into the mounting groove.

[0007] Preferably, a reserved groove is opened on the top surface of the protective cover. The dial is inserted into the reserved groove, and a limiting component is provided between the dial and the reserved groove.

[0008] Preferably, the dial is in a "匚" - shaped plate - like structure. The thickness of the dial is less than the height of the reserved groove. A rubber block is fixed inside the groove of the dial, and the thickness of the rubber block is greater than the height of the groove of the dial.

[0009] Preferably, the limiting component includes a guide rod and a rubber ball sleeved and fixed at one end of the guide rod. A perforation is formed on the surface of the dial, and a card slot is formed at one end of the perforation. The other end of the guide rod is fixed on the surface of the reserved slot. The length of the guide rod is equal to the width of the dial. The card slot is a hemispherical slot. After the dial is inserted into the reserved slot, the rubber ball is stuck in the card slot.

[0010] Preferably, a picking groove is formed on the top surface of the dial.

[0011] A manufacturing method includes the following steps: Pre-insert the dial on the protective cover, and then sleeved the protective cover on the QFN package body. The protective cover covers the metal sheet on the top surface of the bottom plate of the QFN package body. The rubber clip is clamped between the QFN package body and the protective cover. The protective cover is limited on the bottom plate of the QFN package body by the resilience of the rubber clip.

[0012] Compared with the prior art, the beneficial effects of the present invention are: The QFN package structure and its manufacturing method proposed by the present invention, by sleeving a protective cover at the bottom of the QFN package body, and the protective cover is a frame structure with an inner ring opening being a "convex" shaped opening. After the top inner ring opening is sleeved on the top of the QFN package body, the top plate overlaps on the bottom plate of the QFN package body, and the four corners are located in the bottom inner ring opening of the protective cover, realizing the wrapping of the bottom plate of the QFN package body. This wrapping method can effectively prevent the bottom plate of the QFN package body from being knocked and broken by external forces during the period of not being installed and used, protecting the physical integrity of the QFN package body and extending its service life.

[0013] Insert the dial on the top surface of the protective cover. A rubber block is fixed on the bottom surface of the dial, and a limiting component is provided between the dial and the reserved slot. When it is necessary to install and use the QFN package body, first remove the protective cover from the QFN package body, and then pull out the dial from the reserved slot. Pinch the dial with hand to make the rubber block wipe the metal sheet on the bottom plate of the QFN package body. This design facilitates the cleaning of the metal sheet that may be slightly oxidized or stained, solves the problem that the metal sheet cannot be used due to oxidation, and further ensures the normal use of the QFN package body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 an enlarged schematic view of the structure at A in Figure 3 is Figure 1 a cross-sectional view of the structure at B-B in Figure 4 is Figure 3Schematic enlarged view of the structure at C in the [original context]; Figure 5 Schematic diagram of the connection structure between the protective cover and the rubber clip of the present invention; Figure 6 Schematic diagram of the protective cover structure of the present invention; Figure 7 Schematic diagram of the dial structure of the present invention.

[0015] In the figure: QFN package body 1, protective cover 2, embedding groove 201, rubber clip 202, reserved groove 203, dial 3, perforation 301, card slot 302, picking groove 303, rubber block 4, guide rod 5, rubber ball 501. Specific implementation manners

[0016] In order to clearly and completely describe the purpose, technical solution of the present invention and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0017] Embodiment 1, please refer to Figures 1-7 , the present invention provides a technical solution: a QFN package structure, including a QFN package body 1, a protective cover 2 is sleeved at the bottom of the QFN package body 1, a rubber clip 202 is clamped between the protective cover 2 and the QFN package body 1, the QFN package body 呈“凸”字形块 (I'm not sure what this specific Chinese description means exactly, so I'll keep it as is for now), the protective cover 2 is a frame with an inner ring opening in the shape of a "convex" shape, after the top inner ring opening of the protective cover 2 is sleeved on the top of the QFN package body 1, the top plate of the protective cover 2 overlaps on the bottom plate of the QFN package body 1, and the four corners of the QFN package body 1 are located in the bottom inner ring opening of the protective cover 2; embedding grooves 201 are respectively opened at the four corners of the inner wall of the protective cover 2, the height of the embedding groove 201 is equal to the thickness of the bottom plate of the QFN package body 1, the rubber clips 202 and the embedding grooves 201 correspond one by one, the rubber clips 202 are fixedly arranged in the embedding grooves 201, the inner ring surface of the rubber clip 202 protrudes from the embedding groove 20), after the protective cover 2 is sleeved on the QFN package body 1, the part of the rubber clip 202 protruding from the embedding groove 201 is squeezed and compressed into the embedding groove 201.

[0018] After the QFN package body 1 is encapsulated, the metal sheet on the bottom plate surface of the QFN package body 1 is exposed. When the QFN package body 1 is not installed and used, the metal sheet is exposed for a long time, resulting in an oxidation hazard for the metal sheet, thus affecting the normal use of the QFN package body 1; in order to prevent the metal sheet from being oxidized, the protective cover 2 is sleeved on the QFN package body 1, and the protective cover 2 is pushed down until the top plate of the protective cover 2 overlaps on the bottom plate of the QFN package body 1. At this time, the protective cover 2 wraps the bottom plate of the QFN package body 1 to prevent the bottom plate of the QFN package body 1 from being knocked and broken; and the protective cover 2 covers and protects the metal sheet, and the rubber clip 202 is clamped between the QFN package body 1 and the protective cover 2 and deforms and rebounds, thereby increasing the friction between the QFN package body 1 and the protective cover 2 and preventing the protective cover 2 from falling off the QFN package body 1.

[0019] In order to wipe the metal sheet on the bottom plate of the QFN package body 1 with the rubber block 4 and solve the problem that the metal sheet cannot be used due to oxidation, the following is proposed: A dial 3 is inserted into the top surface of the protective cover 2, a rubber block 4 is fixed to the bottom surface of the dial 3, a reserved groove 203 is formed in the top surface of the protective cover 2, the dial 3 is inserted into the reserved groove 203, a limiting component is arranged between the dial 3 and the reserved groove 203, the dial 3 is in a "匚"-shaped plate structure, the thickness of the dial 3 is less than the height of the reserved groove 203, a rubber block 4 is fixed inside the groove body of the dial 3, and the thickness of the rubber block 4 is greater than the height of the groove body of the dial 3; the limiting component includes a guide rod 5 and a rubber ball 501 sleeved and fixed at one end of the guide rod 5, a through hole 301 is formed in the surface of the dial 3, a clamping groove 302 is formed at one end of the through hole 301, the other end of the guide rod 5 is fixed to the surface of the reserved groove 203, the rod length of the guide rod 5 is equal to the plate width of the dial 3, the clamping groove 302 is in a hemispherical groove shape, and after the dial 3 is inserted into the reserved groove 203, the rubber ball 501 is stuck in the clamping groove 302; a picking groove 303 is formed in the top surface of the dial 3.

[0020] When the QFN package body 1 needs to be installed and used, after the protective cover 2 is pulled out and removed from the QFN package body 1, the dial 3 is pulled out from the reserved groove 203, the dial 3 is pinched by hand to make the rubber block 4 wipe the metal sheet on the bottom plate of the QFN package body 1, and then the QFN package body 1 can be installed.

[0021] Usage method of the QFN package structure: For the encapsulated QFN package body 1, since the metal sheet on the bottom plate surface is exposed, there is a risk of oxidation. To avoid oxidation of the metal sheet and prevent the bottom plate of the QFN package body 1 from being bumped and cracked, the protective cover 2 is sleeved on the QFN package body 1. The specific operation is to push down the protective cover 2 until the top plate of the protective cover 2 overlaps on the bottom plate of the QFN package body 1. At this time, the protective cover 2 forms a wrap around the bottom plate of the QFN package body 1 and simultaneously covers and protects the metal sheet. Moreover, a rubber clip 202 is clamped between the protective cover 2 and the QFN package body 1. The rubber clip 202 is fixed in the embedding groove 201 at the four corners of the inner wall of the protective cover 2, and its inner ring surface protrudes from the embedding groove 201. During the sleeving process of the protective cover 2, the protruding part is squeezed and compressed into the embedding groove 201, and the rubber clip 202 deforms and rebounds, increasing the friction between the QFN package body 1 and the protective cover 2 and preventing the protective cover 2 from falling off the QFN package body 1.

[0022] When it is necessary to install and use the QFN package body 1, first remove the protective cover 2 from the QFN package body 1. Then, pull out the拨片 3 from the reserved groove 203 on the top surface of the protective cover 2. The拨片 3 has a "匚"-shaped plate structure, and its thickness is less than the height of the reserved groove 203. A rubber block 4 is fixed inside its groove body, and the thickness of the rubber block 4 is greater than the height of the groove body of the拨片 3. A limiting component is provided between the拨片 3 and the reserved groove 203. The limiting component includes a guide rod 5 and a rubber ball 501 sleeved and fixed at one end of the guide rod 5. A through hole 301 is opened on the surface of the拨片 3, and a clamping groove 302 (the clamping groove 302 is a hemispherical groove) is opened at one end of the through hole 301. The other end of the guide rod 5 is fixed on the surface of the reserved groove 203, and the rod length of the guide rod 5 is equal to the plate width of the拨片 3. After the拨片 3 is inserted into the reserved groove 203, the rubber ball 501 is stuck in the clamping groove 302 to achieve limiting, and when pulling out, just overcome the clamping force between the rubber ball 501 and the clamping groove 302. To facilitate pulling out the拨片 3, a picking groove 303 is opened on its top surface, and the拨片 3 can be pulled out through the picking groove 303.

[0023] Pinch the拨片 3 by hand to make the rubber block 4 wipe the metal sheet on the bottom plate of the QFN package body 1 to solve the problem that the metal sheet may not be usable due to oxidation. After wiping the metal sheet, the QFN package body 1 can be installed.

[0024] Embodiment 2, on the basis of Embodiment 1, proposes a manufacturing method, including the following steps: Pre-insert the拨片 3 on the protective cover 2, and then sleeve the protective cover 2 on the QFN package body 1. The protective cover 2 covers the metal sheet on the top surface of the bottom plate of the QFN package body 1. The rubber clip 202 is clamped between the QFN package body 1 and the protective cover 2, and the protective cover 2 is limited on the bottom plate of the QFN package body 1 by the resilience of the rubber clip 202.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A QFN package structure, comprising a QFN package body (1), characterized in that: A protective cover (2) is sleeved at the bottom of the QFN package body (1). A rubber clip (202) is clamped between the protective cover (2) and the QFN package body (1). A dial (3) is inserted into the top surface of the protective cover (2), and a rubber block (4) is fixed to the bottom surface of the dial (3).

2. The QFN package structure according to claim 1, characterized in that: The QFN package body (1) is in a "convex" - shaped block, and the protective cover (2) is a frame with an inner ring opening in a "convex" - shaped opening. After the top inner ring of the protective cover (2) is sleeved on the top of the QFN package body (1), the top plate of the protective cover (2) overlaps on the bottom plate of the QFN package body (1), and the four corners of the QFN package body (1) are located in the bottom inner ring of the protective cover (2).

3. The QFN package structure according to claim 1, characterized in that: The inner wall of the protective cover (2) is provided with embedding grooves (201) at the four corners. The height of the embedding groove (201) is equal to the thickness of the bottom plate of the QFN package body (1). The rubber clips (202) correspond to the embedding grooves (201) one by one. The rubber clips (202) are fixed in the embedding grooves (201). The inner ring surface of the rubber clip (202) protrudes from the embedding groove (201). After the protective cover (2) is sleeved on the QFN package body (1), the part of the rubber clip (202) protruding from the embedding groove (201) is squeezed and compressed into the embedding groove (201).

4. The QFN package structure according to claim 1, characterized in that: A reserved groove (203) is opened on the top surface of the protective cover (2). The dial (3) is inserted into the reserved groove (203), and a limiting component is arranged between the dial (3) and the reserved groove (203).

5. The QFN package structure according to claim 4, characterized in that: The dial (3) is in a "C" - shaped plate - like structure. The thickness of the dial (3) is less than the height of the reserved groove (203). A rubber block (4) is fixed inside the groove body of the dial (3), and the thickness of the rubber block (4) is greater than the height of the groove body of the dial (3).

6. The QFN package structure according to claim 4, characterized in that: The limiting component includes a guide rod (5) and a rubber ball (501) sleeved and fixed at one end of the guide rod (5). A through - hole (301) is opened on the surface of the dial (3), and a clamping groove (302) is opened at one end of the through - hole (301). The other end of the guide rod (5) is fixed on the surface of the reserved groove (203). The rod length of the guide rod (5) is equal to the plate width of the dial (3). The clamping groove (302) is a hemispherical groove. After the dial (3) is inserted into the reserved groove (203), the rubber ball (501) is stuck in the clamping groove (302).

7. The QFN package structure according to claim 1, characterized in that: A picking groove (303) is opened on the top surface of the dial (3).

8. A manufacturing method for manufacturing the QFN package structure according to any one of claims 1-7, characterized in that: Including the following steps: Pre - insert the dial (3) on the protective cover (2), and then sleeve the protective cover (2) on the QFN package body (1). The protective cover (2) covers the metal sheet on the top surface of the bottom plate of the QFN package body (1). The rubber clip (202) is clamped between the QFN package body (1) and the protective cover (2). The protective cover (2) is limited on the bottom plate of the QFN package body (1) by the resilience of the rubber clip (202).

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