Electronic cigarette sensor with built-in oil-proof cotton structure

Abstract

An electronic cigarette sensor with a built-in oil-proof cotton structure is characterized in that the position of oil-proof cotton is fixed at the bottom of an upper cover and above sealant, the oil-proof cotton and a retaining wall form an air channel with high sealing performance, and the main purpose of the electronic cigarette sensor is to prevent smoke of an air suction hole from returning to a cavity to pollute a micro-electro-mechanical sensor during smoking or reverse blowing. The structure, the upper cover waterproof net and the upper cover structure of the ox nose form an upper cover three-layer oil-proof structure, and the Z-shaped air inlet air passage is matched with the air inlet surface-mounted waterproof net; the electronic cigarette sensor with a five-layer oil-proof and water-proof structure is far better than the electronic cigarette sensor on the market in oil-proof and back-blowing-proof properties, and the problem that the electronic cigarette sensor in the current industry is poor in oil-proof property is better solved.

Description

Technical Field

[0001] This utility model relates to the field of electronic cigarette sensor technology, specifically to an electronic cigarette sensor with a built-in oil-proof cotton structure. Background Technology

[0002] Traditional capacitive microphones, as key components of e-cigarettes, have long been favored by many e-cigarette manufacturers due to their low technical content, low production threshold, and simple assembly. However, with the development and upgrading of the e-cigarette industry, the drawbacks of traditional capacitive microphones have gradually become apparent. These include problems such as excessive negative pressure tolerance during startup, poor stability, poor oil resistance, easy self-starting, inability to achieve high power output, and numerous customer complaints. The electret structure results in poor oil resistance. Even though disposable e-cigarettes have better oil resistance than rechargeable e-cigarettes, this problem still cannot be avoided. Once e-liquid and moisture enter the gap of the capacitive microelectromechanical sensor, the overall performance of the e-cigarette will decrease. If this accumulates over time or all at once, the e-cigarette may fail. The overall structure of the electret e-cigarette sensor is a straight-through type. The air intake uses a non-woven fabric protective mesh, which has a dustproof function. The inner plate of this structure has a large aperture and no protective function for e-liquid passing through the air intake. E-liquid and water stains can directly contaminate the microelectromechanical sensor. The air intake has no protective function, and dust and water stains in the air can easily enter the back of the microelectromechanical sensor through the air intake, resulting in problems such as self-starting risk, poor consistency, and short service life of the e-cigarette sensor.

[0003] The above structure also has the following drawbacks:

[0004] 1. The ECM sensor has a straight-through structure. Due to the structural characteristics of the non-woven protective mesh of the air intake hole, e-liquid and water stains directly enter the microelectromechanical sensor inside the sensor after passing through the protective mesh. When there is a smoking action, the microelectromechanical sensor with e-liquid or water stains adheres directly to the electrode plate, causing the sensor to continuously output, increasing the risk of the sensor automatically starting or not starting.

[0005] 2. The back plate aperture in the ECM sensor structure is too large. E-liquid and water stains that have passed through the protective mesh can directly pass through the plate to the surface of the microelectromechanical sensor, increasing the risk of the electronic cigarette sensor automatically starting or not starting, resulting in a poor user experience for electronic cigarettes and failing to meet the requirements of electronic cigarette customers.

[0006] 3. In the ECM sensor structure, the back electrode plate is close to the air intake hole of the top cover. There is no protective measure for this distance. E-liquid and water stains that have passed through the protective mesh can directly pass through the electrode plate to the surface of the microelectromechanical sensor, which reduces the lifespan of the microelectromechanical sensor, increases the risk of the electronic cigarette sensor automatically starting or not starting, and affects the user experience.

[0007] 4. The ECM sensor's through-hole design means the air intake is directly aligned with the microelectromechanical sensor. Rosin and solder balls generated during the soldering of external wires can easily enter and damage the microelectromechanical sensor, affecting the quality of the electronic cigarette sensor.

[0008] 5. The manual soldering required for ECM sensors greatly increases the possibility of debris and contaminants contaminating the microelectromechanical sensor during the soldering process because the air intake holes on the back of the electret circuit board have no protective measures.

[0009] 6. When soldering the outer wires of the ECM sensor, rosin and solder balls can easily splash into the air inlet and damage the microelectromechanical sensor, causing the microelectromechanical sensor to fail or not start, increasing the risk of abnormal quality of the shipped electronic cigarette sensor.

[0010] 7. The mainstream MEMS-packaged electronic cigarette sensors on the market also lack this oil-proof cotton structure. In terms of manufacturing process, it is very easy to damage and contaminate the MEMS sensor, leading to failure. In terms of application, the problem of preventing backflush and smoke is still a challenge for MEMS-packaged products on the market. Utility Model Content

[0011] (a) Technical problems to be solved

[0012] To address the aforementioned problems, this invention provides an electronic cigarette sensor with a built-in oil-resistant cotton structure.

[0013] (II) Technical Solution

[0014] To achieve the above objectives, this utility model provides the following technical solution: an electronic cigarette sensor with a built-in oil-proof cotton structure, comprising a packaging bracket, a top cover, a microelectromechanical sensor (MEMS), an ASIC chip, and oil-proof cotton. The packaging bracket has a cavity with an upper opening. A high step is provided on one side of the bottom wall of the cavity. An air intake channel is provided on the high step, penetrating the high step and the bottom wall of the packaging bracket. The MEMS is also fixed on the high step by a low-stress colloid. The ASIC chip is fixed on the bottom wall of the cavity away from the high step by a high thermal conductivity colloid. The ASIC chip is connected to the MEMS via bonding wires. The MEMS and ASIC chip are covered with sealant. A layer of oil-proof cotton is attached on top of the sealant. The oil-proof cotton is located at the bottom of the fixed top cover, above the sealant, forming a highly sealed air passage with the partition wall. This structure, together with the waterproof mesh of the top cover and the "bull nose" top cover structure, forms a three-layer oil-proof structure. The Z-shaped air intake channel structure is then directly attached with the air intake waterproof mesh, forming a five-layer oil-proof structure for the electronic cigarette sensor.

[0015] The top cover is fitted with a two-layer oil-proof structure consisting of a waterproof mesh and oil-proof cotton. Combined with the bull-nose oil-proof structure of the air intake hole, the air intake hole forms a three-layer oil-proof structure. Together with the Z-shaped airway oil-proof structure of the air intake hole and the waterproof mesh of the air intake hole, the overall electronic cigarette has a five-layer oil-proof structure.

[0016] The improvement of this utility model is that the oil-proof cotton is made of a material that is oil-proof and waterproof.

[0017] The improvement of this utility model is that the thickness of the oil-proof cotton is reasonably matched with the height of the partition wall, so that the air space above the ASIC chip is completely filled with oil-proof cotton.

[0018] The improvement of this utility model is that the external shape of the oil-proof cotton is consistent with the shape of the space above the ASIC inside the cavity.

[0019] The improvement of this utility model is that the oil-proof cotton adopts an adhesive backing structure and can withstand the high temperature of reflow soldering.

[0020] The improvement of this utility model is that the waterproof mesh, the top cover, and the oil-proof cotton are integrally molded.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, this utility model provides an electronic cigarette sensor with a built-in oil-proof cotton structure, which has the following beneficial effects:

[0023] 1. This structure adopts a MEMS packaging structure. The entire electronic cigarette sensor includes an oil-resistant bullnose structure, a waterproof mesh cover, a waterproof mesh for the air inlet, oil-resistant cotton, and a Z-shaped air inlet channel. This five-layer oil-resistant and waterproof electronic cigarette sensor is far superior to the oil resistance and backflush prevention of electronic cigarette sensors on the market, and better solves the pain point of poor oil resistance of current electronic cigarette sensors in the industry.

[0024] 2. Built-in oil-proof cotton structure optimizes the problem of no protection measures for the air intake of traditional electret-type encapsulation, reduces the risk of water and oil entering the air intake of traditional electret-type encapsulation and contaminating the microelectromechanical sensor. The defect that the internal structure cannot add oil-proof cotton solves the problem of smoke contamination of microelectromechanical sensors caused by smoke or backflushing of traditional electrets.

[0025] 3. Microelectromechanical sensors use wafer etching technology, and the resulting diaphragm and back electrode plate are both made of silicon crystal. The holes on the back electrode plate are etched using nanoscale etching technology. The hole diameter of the back electrode plate is much smaller than that of the electret plate. Its characteristic is that it is more susceptible to contamination. During the manufacturing process and module assembly, dust particles can easily contaminate the microelectromechanical sensor. The oil-proof cotton structure better protects the microelectromechanical sensor from contamination by external particles.

[0026] 4. The built-in oil-proof cotton structure fills the space above the ASIC colloid, which on the one hand protects the microelectromechanical sensor from smoke and e-liquid entering the cavity and contaminating it, and on the other hand protects the microelectromechanical sensor from contaminants that fall off when the electronic cigarette sensor is returned for repair.

[0027] 5. The waterproof mesh, top cover, and oil-proof cotton are integrally molded. The waterproof mesh, top cover, and oil-proof cotton are applied in batches, solving the efficiency and labor cost difficulties of applying the electret mesh separately.

[0028] 6. The oil-proof cotton filling isolates the air intake hole from the microelectromechanical sensor, reducing the contamination of the microelectromechanical sensor by pollutants in subsequent processes, improving the poor oil resistance of electronic cigarette sensors, and enabling the mass production of high-quality, high-performance electronic cigarette sensors. Attached Figure Description

[0029] Figure 1 This is a schematic cross-sectional view of the structure of this utility model;

[0030] Figure 2 This is a top view of the structure of this utility model;

[0031] Figure 3 This is a bottom view of the structure of this utility model;

[0032] Figure 4 Top view of the structure of this utility model Figure 2 .

[0033] In the diagram: 1. Package bracket; 2. Top cover; 3. MEMS sensor; 4. ASIC chip; 5. High step; 6. Air intake channel; 7. Baffle wall; 8. Sealant; 9. Waterproof mesh on top cover; 10. Air intake hole; 11. Oil-proof cotton; 12. Surface mount pad; 13. Bonding wire; 14. Waterproof mesh for air intake hole. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figure 1-4An electronic cigarette sensor with a built-in oil-proof cotton structure includes a packaging bracket 1, a top cover 2, a microelectromechanical sensor 3, an ASIC chip 4, and oil-proof cotton 11. The packaging bracket 1 has a cavity with an upper opening. A high step 5 is provided on one side of the bottom wall of the cavity. An air intake channel 6 is provided on the high step 5, which passes through the high step 5 and the bottom wall of the packaging bracket 1. The microelectromechanical sensor 3 is also fixed on the high step 5 with a low-stress adhesive. The ASIC chip is fixed on the bottom wall of the cavity away from the high step 5 with a high thermal conductivity adhesive. Chip 4, the ASIC chip 4 is connected to the microelectromechanical sensor 3 via bonding wire 13. The microelectromechanical sensor 3 and the ASIC chip 4 are covered with sealant 8. A layer of oil-proof cotton 11 is attached above the sealant 8. The oil-proof cotton 11 is fixed at the bottom of the top cover, above the sealant 8, and forms a highly sealed air passage with the partition wall 7. This structure, together with the waterproof mesh 9 of the top cover and the top cover structure of the "bull nose", forms a three-layer oil-proof structure. The air inlet is then directly attached with the air inlet waterproof mesh 14, forming a five-layer oil-proof structure for the electronic cigarette sensor.

[0036] The top cover 2 is fitted with two layers of oil-proof structure: a waterproof mesh 9 and an oil-proof cotton 11. Combined with the oil-proof structure of the air intake hole, the air intake hole forms a three-layer oil-proof structure. Together with the Z-shaped airway oil-proof structure of the air intake hole and the waterproof mesh of the air intake hole, the overall electronic cigarette has a five-layer oil-proof structure.

[0037] The oil-proof cotton is made of an oil- and water-resistant material. The thickness of the oil-proof cotton is appropriately matched to the height of the partition wall, ensuring that the air space above the ASIC chip is completely filled with it. The external shape of the oil-proof cotton is consistent with the shape of the space above the ASIC within the cavity.

[0038] The oil-proof cotton adopts an adhesive backing structure and can withstand the high temperature of reflow soldering. The waterproof mesh 9, the top cover 2, and the oil-proof cotton 11 are integrally formed.

[0039] The main advantages of using MEMS packaging technology are: 1. It provides mechanical support for the packaging of microelectromechanical sensor chips. This packaging structure generates less stress and has less impact on the sensitive components to be packaged. The coefficient of thermal expansion (CTE) of the material must be similar to or slightly larger than that of silicon. Due to material mismatch, interface stress can easily occur, causing the chip to crack or delaminate; 2. MEMS packaging needs to protect the microstructure, circuits, and electrical connections to ensure the stability and reliability of the system. On the other hand, it must also provide one or more environmental interfaces for the sensor chip to fully sense changes in the measured physical quantity. 3. For MEMS structure and circuit packaging, heat dissipation must be given full attention. MEMS packaging has a superior heat dissipation structure. 4. For some special sensors and actuators, the airtightness of the packaging needs to be considered. The airtightness and leakage of the packaging are crucial to improving the accuracy and service life of pressure sensors. This packaging provides a highly sealed cavity environment, providing a stable environment and high oil and water resistance for the start-up of capacitive electronic cigarette sensors. 5. The packaging must provide a path to the outside world. It can use SMT surface mount technology to connect with external functional modules. The main processes of MEMS packaging include: chip bonding, wire bonding, capping and other key basic processes.

[0040] This utility model adopts a MEMS packaging process of silicon microelectromechanical sensor 3 + ASIC chip 4 + packaging bracket 1. Chip bonding: The microelectromechanical sensor 3 is fixed to the high step 5 within the cavity of the packaging bracket 1 using low-stress adhesive; the bottom of the ASIC chip 4 is fixed to the low step of the packaging bracket 1 using high thermal conductivity adhesive. The large copper block at the bottom of the packaging bracket 1 is grounded, greatly increasing the heat dissipation of the ASIC. Other silver-plated pads within the cavity can be used for SMT mounting of other components, such as LEDs, filter capacitors, resistors, etc. Wire bonding: The electrical wires between the microelectromechanical sensor 3 and the ASIC chip 4... The circuit connection is made through low-impedance bonding wire 13; the capacitance change signal of the microelectromechanical sensor 3 is transmitted to the ASIC chip 4 for processing through the bonding wire 13; the ASIC chip 4 and the pad are connected by bonding wire 13 made of high thermal conductivity and high electrical conductivity material, and then the ASIC chip 4 and the bonding wire 13 are sealed and protected by high thermal conductivity sealant 8; the ASIC transmits the electrical signal to be output through the bonding wire 13. The high thermal conductivity wire and the sealant can accelerate the heat dissipation and improve the power conversion efficiency of the ASIC chip 4; sealing: after the components are mounted in the cavity of the package bracket 1, a layer of oil-proof cotton 12 is attached on top of the sealant 8.

[0041] Its main purpose is to prevent e-liquid from the air intake from returning to the cavity, forming a three-layer oil-proof structure with the waterproof mesh of the top cover 2 and the top cover structure of the "bull nose". The one-piece molded top cover 2 is respectively attached to the top and bottom of the bracket. The one-piece molded top cover 2 is covered with a waterproof mesh coated with a nano-film, and the air intake is directly attached with the waterproof mesh. MEMS packaged structure electronic cigarette sensors will become the inevitable development trend in the future electronic cigarette sensor field. In order to adapt to the use of existing main electret users and module installation, surface mount technology (SMT) soldering is used on other module circuits. Surface mount soldering can reduce the cost of external wiring materials and manual soldering, improve the adhesion and stability of module components, device heat dissipation, and high sealing performance, and solve a series of difficulties such as poor oil resistance, low solderability, poor batch production, and low quality of electret electronic cigarette sensors.

[0042] The beneficial effects of this utility model of an electronic cigarette sensor with a built-in oil-proof cotton structure are as follows:

[0043] 1. This structure adopts a MEMS packaging structure. The entire electronic cigarette sensor includes an oil-resistant bullnose structure, a waterproof mesh on the top cover 6, a waterproof mesh for the air inlet 14, and an oil-resistant cotton 12. This four-layer oil-resistant and waterproof electronic cigarette sensor is far superior to the oil resistance and backflush prevention of electronic cigarette sensors on the market, and better solves the pain point of poor oil resistance of current electronic cigarette sensors in the industry.

[0044] 2. This structure adopts MEMS (Micro-Electro-Mechanical Systems) packaging technology. The bottom of the ASIC is in full contact with the bottom of the packaging bracket 1 through a high thermal conductivity colloid, and then the ASIC chip and its bonding wires 13 are sealed and protected by thermally conductive sealant 8, which better protects the ASIC chip 4, reduces the impact of light noise, and improves heat dissipation. This process ensures the high heat dissipation performance of the ASIC, enabling the electronic cigarette sensor to achieve stable high-power output and improve the electronic cigarette customer experience; it solves the difficulties of poor heat dissipation of traditional packaging and failure caused by empty solder joints after surface mounting.

[0045] 3. The bottom air inlet is fitted with a waterproof mesh structure, which optimizes the problem of the lack of protection for the air inlet of the traditional electret-type package. It reduces the risk of water and oil entering the air inlet of the traditional electret-type package and contaminating the microelectromechanical sensor. It also solves the problem of solder balls and rosin splashing and contaminating the microelectromechanical sensor when soldering the external line of the traditional electret.

[0046] 4. The microelectromechanical sensor 3 uses wafer etching technology, and the diaphragm and back electrode plate it produces are both made of silicon crystal. The holes on the back electrode plate are made using nanoscale etching technology. The hole diameter of the back electrode plate is much smaller than that of the electret electrode plate, which shows great advantages in terms of sensitivity, waterproof and oil-proof performance, and high temperature resistance. Therefore, it is not easy to deform during the manufacturing process, has high diaphragm tension consistency, long service life, and reduces the risk of self-starting.

[0047] 5. The epitaxial pads can be surface-mounted, which reduces the cost of external wiring. The bonding with the module is strong and not easy to fall off. The device has good heat dissipation, which solves the difficulty of installing electret modules and speeds up production efficiency.

[0048] 6. The encapsulation bracket 1 is provided with an inverted "Z" shaped air hole, so that the intake air channel and the diaphragm are not directly aligned, preventing oil, water and dust passing through the waterproof mesh from directly damaging the microelectromechanical sensor;

[0049] 7. The waterproof mesh and the top cover are integrally molded. The waterproof mesh and the top cover are applied in batches, which solves the problems of efficiency and labor cost of applying waterproof mesh to electrets separately.

[0050] 8. The filling of oil-proof cotton 12 isolates the air intake hole from the microelectromechanical sensor 3, reduces the contamination of the microelectromechanical sensor 3 by contaminants in subsequent processes, improves the poor oil resistance of electronic cigarette sensors, and enables the mass production of high-quality, high-performance electronic cigarette sensors.

[0051] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0052] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0053] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. The above embodiments only illustrate several preferred embodiments of the present invention, and their descriptions are relatively specific and detailed. It should be understood that the present invention is not limited to the forms disclosed herein and should not be considered as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be modified within the scope of the present invention's concept through the above teachings or related technologies or knowledge. This should not be construed as a limitation on the scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. The modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and these all fall within the protection scope of the appended claims. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An electronic cigarette sensor with a built-in oil-proof cotton structure, characterized in that, The package includes a packaging bracket (1), a top cover (2), a microelectromechanical sensor (3), an ASIC chip (4), and an oil-proof cotton (11). The packaging bracket (1) has a cavity with an upper opening. A high step (5) is provided on one side of the bottom wall of the cavity. An air intake channel (6) is provided on the high step (5) and the bottom wall of the packaging bracket (1). The microelectromechanical sensor (3) is also fixed on the high step (5) by a low-stress colloid. The ASIC chip (4) is fixed on the bottom wall of the cavity away from the high step (5) by a high thermal conductivity colloid. The ASIC chip (4) is connected to the packaging bracket (1) by a high thermal conductivity colloid. The bonding wire (13) is connected to the microelectromechanical sensor (3). The microelectromechanical sensor (3) and the ASIC chip (4) are covered with sealant (8). A layer of oil-proof cotton (11) is attached above the sealant (8). The oil-proof cotton (11) is located at the bottom of the fixed cover (2) and above the sealant (8). It forms a strong air passage with the partition wall (7). This structure, together with the waterproof mesh (9) of the cover and the top cover (2) of the bull's nose, forms a three-layer oil-proof structure. The Z-shaped air intake channel (6) structure is then directly attached with the air intake hole waterproof mesh (14), forming a five-layer oil-proof structure for the electronic cigarette sensor.

2. The electronic cigarette sensor with a built-in oil-proof cotton structure according to claim 1, characterized in that: The oil-proof cotton is made of a material that is oil-proof and waterproof.

3. The electronic cigarette sensor with a built-in oil-proof cotton structure according to claim 1, characterized in that: The thickness of the oil-proof cotton is appropriately matched with the height of the partition wall, so that the air space above the ASIC chip is completely filled with the oil-proof cotton.

4. The electronic cigarette sensor with a built-in oil-proof cotton structure according to claim 1, characterized in that: The shape and structure of the oil-proof cotton are consistent with the shape and structure of the space above the ASIC inside the cavity.

5. The electronic cigarette sensor with a built-in oil-proof cotton structure according to claim 1, characterized in that: The oil-proof cotton uses an adhesive backing structure and can withstand the high temperature of reflow soldering.

6. The electronic cigarette sensor with a built-in oil-proof cotton structure according to claim 1, characterized in that: The waterproof mesh (9), the cover (2), and the oil-proof cotton (11) are integrally molded.

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