A micro cell phone electromagnet

Abstract

The utility model discloses a kind of micro mobile phone electromagnet, it includes shell, moving iron core, coil, fixed iron core, spring, capillary, flexible circuit board and fixing piece;Moving iron core is stretched out or position locking by magnetization and spring cooperation, coil adopts hollow design of no plastic framework and inserts 304 stainless steel capillary, fixed iron core and moving iron core are manufactured using MIM (metal injection) process, significantly improve magnetic flux and machining accuracy;When not power on, moving iron core is stretched out under the action of spring, limit camera to stretch out or retract;When power on, moving iron core is retracted by adsorption, camera can normally pop out or retract, the locking function of electromagnet limits camera to be stored to mobile phone inside, prevent malicious APP to steal user privacy;The application can effectively improve the security of smartphone, while meeting the demand of light and thin.

Description

Technical Field

[0001] This utility model relates to the technical field of smartphone accessories, and in particular to a miniature mobile phone electromagnet. Background Technology

[0002] With the rapid development of smartphones, various applications (APPs) are emerging in endless streams and constantly being updated and iterated. Some of these APPs access the camera during operation, and some even secretly record users' faces without authorization, posing a serious threat to user privacy and security. To solve this problem, a mobile phone structure that can effectively prevent the misuse of the camera is needed. Specifically, the camera (mainly the front-facing camera) can be set as an independent component that can extend or move inside the phone, so that it can be stored inside the phone when not in use to protect user privacy. However, realizing this function requires a miniaturized electromagnet device to limit the extension and retraction of the camera and lock its position. Traditional electromagnets, due to their large size, complex structure, and insufficient magnetic force, are difficult to meet the requirements of modern smartphones for miniaturization, thinness, and high-precision control. Therefore, there is an urgent need to develop a miniaturized, high-performance electromagnet device that can fit into the small internal space of a mobile phone and reliably limit the extension and retraction of the camera, thereby effectively solving the privacy and security risks and structural design challenges of existing technologies. Utility Model Content

[0003] This invention addresses the problem of malicious applications (APPs) secretly capturing user privacy in existing smartphone cameras by providing a miniature mobile phone electromagnet. This electromagnet achieves privacy protection by controlling the extension, translation, or locking of the camera's position. The miniature mobile phone electromagnet includes components such as a shell, a moving iron core, a coil, a fixed iron core, a spring, a capillary tube, a flexible circuit board, and fixing parts. These components function through specific connections and interactions.

[0004] This utility model provides a miniature mobile phone electromagnet, whose overall structure consists of several key components that work together. Among them:

[0005] The outer shell is a cylindrical structure with an outer diameter ranging from 3 to 7 mm and a length ranging from 5 to 10 mm. In a specific embodiment, the outer diameter is 4.5 mm and the length is 6.6 mm. Notably, one end of the outer shell is provided with an opening for fixing the iron core and providing a mounting base for internal components. To meet the requirements of thinness and lightness, the overall length of this embodiment is 7.3 mm.

[0006] Furthermore, the moving iron core is vertically fixed by a guide rod and a crossbar. One end of the guide rod extends outward through the outer shell, and the crossbar is used to abut against the spring. The moving iron core uses magnetized iron core material and is manufactured through metal injection molding (MIM) process, significantly improving magnetic flux and processing accuracy. A load platform is integrally formed at the end of the crossbar of the moving iron core to limit the movement of the camera. The moving iron core slides within the outer shell and is driven by the magnetic field generated by the energized coil to perform telescopic translation or position locking. In the de-energized state, the moving iron core is pushed out by the spring; in the energized state, the moving iron core is magnetically attracted and moves inward.

[0007] Specifically, the spring is sleeved on the moving iron core, with its two ends abutting against the bottom of the crossbar and the outer surface of the outer casing, respectively, for the reset of the moving iron core. When the coil is not energized, the spring pushes the moving iron core outward; when the coil is energized, the moving iron core moves inward against the spring force.

[0008] Furthermore, the coil employs a hollow coil design without a plastic frame, and is wound using an aligned winding process, effectively enhancing the electromagnetic force with the same number of turns. A capillary tube is inserted in the middle of the coil as an internal support structure. When the coil is energized, it generates a magnetic field, driving the moving iron core to extend, translate, or lock in position.

[0009] Specifically, the capillary tube is made of 304 stainless steel and has a through-hole structure with an outer diameter of 1.3 mm and an inner diameter of 1.1 mm. A sliding guide rod is inserted into one end of the capillary tube, and the other end is fixed to the iron core to ensure the stability of the coil's internal structure, while reducing tolerances to accommodate miniaturized designs.

[0010] Furthermore, the fixed iron core has an upwardly extending snap-fit ​​end in its middle, which is inserted into the capillary tube and fixed to the outer shell. The fixed iron core is also manufactured using MIM technology to improve magnetic flux and machining accuracy. The fixed iron core has a connecting groove for the connecting wires from the coil to pass through and be soldered to the flexible circuit board. The flexible circuit board is adhered to the bottom outer side of the fixed iron core, and a UV adhesive layer is applied to the flexible circuit board, covering the solder joints between the connecting wires and the flexible circuit board. The purpose of UV encapsulation is to ensure the product itself is waterproof, with a waterproof rating of IP68.

[0011] Specifically, the flexible circuit board is only 0.1mm thick, making it suitable for electrical connections within the confined space of a mobile phone and saving more space compared to traditional PIN designs. The coil is soldered to the flexible circuit board via a pressure-bonded connecting wire, and the positive and negative terminals on the flexible circuit board are connected to external circuits to power the coil.

[0012] Furthermore, the fixing component is located on the outer side wall of the housing to fix the housing inside the mobile phone, ensuring the stability of the electromagnet during use.

[0013] The working principle of this utility model is as follows:

[0014] S1: When the coil is not energized, the moving iron core is pushed out by the spring, preventing the camera from extending outside the phone and keeping it in a hidden state.

[0015] S2: After the coil is energized, a magnetic field is formed, and the moving iron core is attracted and moves inward. The camera can be lifted and housed inside the phone by the motor and other drives. After the action is completed, the electromagnet is de-energized, and the moving iron core is pushed out by the spring without the magnetic field, locking the camera's movement slot to prevent the camera from popping out without reason, thereby protecting user privacy and preventing certain apps from secretly taking pictures of the user's face through the camera.

[0016] Furthermore, the innovative points of this utility model and its specific implementation methods are as follows:

[0017] Specifically, the moving iron core is manufactured using MIM (Metal Injection Molding) technology, which significantly improves magnetic flux and machining accuracy compared to traditional turning or stamping processes. The load platform of the moving iron core is extended and set using a one-piece molding process, and the load platform is used to limit the movement of the camera.

[0018] Specifically, the coil adopts a hollow coil design without a plastic frame, and is wound using an array winding process, which effectively enhances the electromagnetic force with the same number of turns. The capillary tube inserted in the middle of the coil is made of 304 stainless steel, with an outer diameter of 1.3mm and an inner diameter of 1.1mm, ensuring reduced tolerances and improved structural stability in the miniaturized design.

[0019] Specifically, the fixed iron core is inserted into the capillary tube and fixed to the outer shell through the snap-fit ​​end, ensuring the relative position between the fixed iron core and the coil is stable. At the same time, the magnetic flux and processing accuracy are improved by manufacturing through MIM process.

[0020] In particular, the flexible circuit board adopts a pressure welding connection method and has a thickness of 0.1mm, which saves more space compared to the traditional PIN pin design and is suitable for electrical connections in the small space of mobile phones.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] By employing hollow coils without plastic frames and moving and fixed iron cores manufactured using MIM technology, electromagnetic force and magnetic flux are significantly improved, enabling the miniature mobile phone electromagnet to achieve efficient driving within a limited space.

[0023] By optimizing the casing size and selecting low-tolerance 304 stainless steel capillary tubes, the requirements for thinner and lighter mobile phones are met, while ensuring structural stability and reliability.

[0024] By controlling and locking the camera's position, it effectively prevents certain apps from secretly photographing users' privacy through the front-facing camera, thus improving smartphone security.

[0025] In summary, this utility model provides a highly efficient and reliable miniature mobile phone electromagnet through innovative structural design and advanced manufacturing process. It can solve the problem of cameras being secretly photographed by malicious apps in the prior art, while meeting the demands of modern smartphones for thinness and high performance. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0027] Figure 2 This is a breakdown diagram of the components of this utility model;

[0028] Figure 3 This is a side view of the present invention;

[0029] Figure 4 This is a cross-sectional view of the present invention.

[0030] Attached image annotations:

[0031] 1. Housing; 2. Guide rod; 3. Crossbar; 4. Load platform; 5. Moving iron core; 6. Coil; 7. Flexible circuit board; 8. Capillary tube; 9. Fixed iron core; 10. Spring; 11. Snap-in end; 12. Connecting wire; 13. Connecting groove; 14. Fixing component. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings:

[0036] A miniature mobile phone electromagnet, its specific structure and working principle are described in conjunction with the attached document. Figure 1 To be continued Figure 3 A detailed explanation follows. This miniature mobile phone electromagnet controls and limits the position of the camera, thus preventing malicious apps from secretly photographing users' privacy.

[0037] The mobile phone camera is located inside the phone and its forward and backward sliding is controlled by a built-in micro motor. Because the mounting shell inside the phone has a sliding groove, the movement of the mobile phone camera is carried out by sliding along this groove. The present invention aims to limit the extension of the mobile phone by setting an additional electromagnet inside the phone, whose moving iron core 5 can be pressed against the sliding groove through which the mobile phone camera slides out. Example 1:

[0038] like Figure 1The diagram shows a three-dimensional structural representation of this invention. The outer shell 1 is cylindrical with an outer diameter ranging from 3 to 7 mm and a length ranging from 5 to 10 mm. The thickness of a mobile phone is generally 8-9 mm; specifically, in this embodiment, the outer diameter of the outer shell 1 is 4.5 mm and the length is 6.6 mm. In this embodiment, the axial direction of the outer shell 1 is parallel to the plane of the mobile phone. The thickness of this invention is the maximum outer diameter of the shell, which in this embodiment is 4.5 mm, making it suitable for a wide range of mobile phone models. The overall length (the overall length when the moving iron core is retracted) is also maintained at 8.15 mm. One end of the outer shell 1 has an opening for fixing the fixed iron core 9 and providing a mounting base for internal components. A moving iron core 5 is slidably disposed inside the outer shell 1. The moving iron core 5 is vertically fixed by a guide rod 2 and a crossbar 3, wherein the guide rod 2 extends outward through one end of the outer shell 1, and the crossbar 3 abuts against the spring 10. The top of the moving iron core 5 is integrally molded and extended with a load platform 4, which is used to limit the movement of the camera. Specifically, when the moving iron core is not under the influence of a magnetic field, it is pushed out by a spring, locking the camera's movement slot and preventing the camera from popping out unnecessarily. When the coil is energized, a magnetic field is generated, and the moving iron core is attracted and moves inward, allowing the camera to move freely under the control of the drive component. The moving iron core 5 uses magnetized iron core material and is manufactured using metal injection molding (MIM) technology, significantly improving magnetic flux and processing accuracy. In the unenergized state, the moving iron core 5 is pushed outward by the spring 10, while when the coil 6 is energized, it is attracted and moves inward.

[0039] like Figure 2The diagram shown is an disassembled view of this utility model. A coil 6 is fixedly installed inside the outer casing 1. The coil 6 is a hollow coil design without a plastic frame, wound using a row-arrangement process, effectively increasing the electromagnetic force with the same number of turns. A capillary tube 8 is inserted into the middle of the coil 6 as a support structure. The capillary tube 8 is made of 304 stainless steel, has a through-hole structure, an outer diameter of 1.3 mm, and an inner diameter of 1.1 mm. A slidable guide rod 2 is inserted into one end of the capillary tube 8, and a fixed iron core 9 is fixed to the other end. An upwardly extending insertion end 11 is provided in the middle of the fixed iron core 9, which is inserted into the capillary tube 8 and fixed to the outer casing 1. The fixed iron core 9 is also manufactured using the MIM process, significantly improving magnetic flux and machining accuracy. The fixed iron core 9 has a connecting slot 13 for the connecting wire 12 from the coil 6 to pass through and be soldered to the flexible circuit board 7. The flexible circuit board 7 (Flexible Printed Circuit, FPC) is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film as the substrate. It features high wiring density, light weight, thinness, and good bending performance. The flexible circuit board 7 is 0.1mm thick, suitable for electrical connections in the confined space of mobile phones, and saves more space compared to traditional PIN designs. The coil 6 is soldered to the flexible circuit board 7 via the pressure-bonded connecting wire 12. The positive and negative terminals on the flexible circuit board 7 are connected to the external circuit to supply power to the coil 6. The flexible circuit board 7 is attached to the bottom outer side of the fixed iron core 9, and a UV adhesive layer 15 is encapsulated on the flexible circuit board 7, covering and wrapping the solder joint between the connecting wire and the flexible circuit board 7. The purpose of completing the UV encapsulation is to ensure that the product itself is waterproof, with a waterproof rating of IP68.

[0040] like Figure 3 The image shown is a side view of this invention. A spring 10 is sleeved on the moving iron core 5, with its two ends abutting the bottom of the crossbar 3 and the outer surface of the outer casing 1, respectively, for resetting the moving iron core 5. When the coil 6 is not energized, the moving iron core 5 is pushed out by the spring 10, locking the camera's movable slot and preventing the camera from popping out unnecessarily. When the coil 6 is energized, a magnetic field is formed, attracting the moving iron core 5 inward, allowing the camera to be housed inside the phone, thus protecting user privacy and preventing certain apps from secretly photographing the user's face. For details, please refer to... Figure 4 When the moving iron core 5 is magnetically attracted and moved inward, the distance between the top surface of the moving iron core 5 and the top surface of the outer shell 1 is 1.55mm, and the extension and contraction of the moving iron core 5 is 0.8mm. That is to say, even in the ejected state, the overall length of this utility model is 8.95mm, which is suitable for use inside a mobile phone.

[0041] Further explanation of the working principle of this utility model: S1, when the coil 6 is not energized, the moving iron core 5 is pushed out by the spring 10. At this time, the camera mounted on the moving iron core 5 extends out of the phone and is in normal use. S2, after the coil 6 is energized, a magnetic field is formed, and the moving iron core 5 is attracted and moved inward, so that the camera can be housed inside the phone, thereby protecting user privacy and preventing certain apps from secretly taking pictures of the user's face through the camera. Through the above process, this utility model achieves position control of the camera, ensuring user privacy and security.

[0042] This invention also pays special attention to detailed design to meet the miniaturization and high performance requirements of smartphones. For example, the dimensions of the outer shell 1 are optimized to meet the requirements of thinness and lightness while ensuring the stability of the overall structure. The moving iron core 5 is manufactured using MIM technology, which significantly improves magnetic flux and machining accuracy compared to traditional turning or stamping processes. The load platform 4 of the moving iron core 5 is extended through a one-piece molding process to ensure the installation stability of the camera. The coil 6 adopts a hollow coil design without a plastic frame and is wound using an aligned arrangement process to effectively improve the electromagnetic force with the same number of turns. The capillary tube 8 inserted in the middle of the coil 6 is made of 304 stainless steel with an outer diameter of 1.3mm and an inner diameter of 1.1mm, ensuring reduced tolerances and improved structural stability in the miniaturization design. The fixed iron core 9 is inserted into the capillary tube 8 and fixed to the outer casing 1 via the snap-fit ​​end 11. Specifically, the fixed iron core 9 is located at the opening in the outer casing 1. During fixing, the outer peripheral sidewall of the fixed iron core 9 is fixedly connected to the inner sidewall of the opening in the outer casing 1, for example, by welding, to ensure the relative position between the fixed iron core 9 and the coil 6 is stable. At the same time, the magnetic flux and processing accuracy are improved by using MIM technology. The flexible circuit board 7 adopts a pressure welding connection method and has a thickness of 0.1mm. Compared with the traditional PIN pin design, it saves more space and is suitable for electrical connections in the small space of mobile phones.

[0043] Furthermore, this invention also includes a fixing member 14 fixedly provided on the outer wall of the outer casing 1, which facilitates the fixation of the outer casing 1 within the mobile phone. The design of the fixing member 14 ensures the stability of the miniature mobile phone electromagnet during use, preventing positional shifts caused by phone vibrations or other external factors, thus avoiding interference with the normal operation of the camera.

[0044] This invention offers significant technical advantages: by employing a hollow coil 6 without a plastic skeleton and moving iron core 5 and fixed iron core 9 manufactured using MIM technology, electromagnetic force and magnetic flux are significantly enhanced, enabling efficient actuation of the miniature mobile phone electromagnet within a limited space. Optimizing the dimensions of the outer shell 1 and selecting low-tolerance 304 stainless steel capillary tubes 8 meets the requirements for a thinner and lighter mobile phone while ensuring structural stability and reliability. By controlling the extension, translation, or position locking of the camera, it effectively prevents certain apps from secretly photographing user privacy through the camera, thus improving the security of smartphones. Example 2:

[0045] The difference from the first embodiment lies in the size of the outer shell 1: in order to further meet the requirements of some mobile phones to be thin and light, the outer shell 1 in this embodiment has an outer diameter of 3.5mm and a length of 6.6mm; while the overall length (the overall length when the moving iron core is stored) in the second embodiment is also 8.15mm. In addition, the rest of the structure, components and connection methods are the same as those in the first embodiment.

[0046] In summary, this utility model, through innovative structural design and advanced manufacturing process, provides a highly efficient and reliable miniature mobile phone electromagnet that solves the problem of malicious apps potentially taking photos of the camera in existing technologies, while simultaneously meeting the demands of modern smartphones for thinness and high performance. The specific embodiments of this utility model fully disclose each step and technical detail, ensuring the completeness and feasibility of the technical solution.

[0047] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A miniature mobile phone electromagnet, characterized in that: The device includes a housing (1), a moving iron core (5), a coil (6), a fixed iron core (9), a spring (10), a capillary tube (8), a flexible circuit board (7), and a fixing component (14). The housing (1) is a cylindrical structure with an opening at one end. The moving iron core (5) is vertically fixed by a guide rod (2) and a crossbar (3) and extends outward through one end of the housing (1). The capillary tube (8) is inserted in the middle of the coil (6). The fixed iron core (9) is inserted into the capillary tube (8) through a snap-fit ​​end (11) and fixed on the housing (1). The spring (10) is sleeved on the moving iron core (5) and its two ends abut against the bottom of the crossbar (3) and the outer surface of the housing (1), respectively. The flexible circuit board (7) is welded to the coil (6) through a connecting wire (12). The fixing component (14) is set on the outer side wall of the housing (1).

2. The miniature mobile phone electromagnet as described in claim 1, characterized in that: The outer diameter of the outer casing (1) ranges from 3 to 7 mm and the length ranges from 5 to 10 mm.

3. The miniature mobile phone electromagnet as described in claim 2, characterized in that: The outer diameter of the outer shell (1) is 4.5 mm and the length is 6.6 mm.

4. The miniature mobile phone electromagnet as described in claim 1, characterized in that: The end of the crossbar (3) of the moving iron core (5) is integrally formed and extended with a load platform (4), which is used to limit the movement of the camera.

5. The miniature mobile phone electromagnet as described in claim 4, characterized in that: The moving iron core (5) is manufactured using a metal injection molding process.

6. The miniature mobile phone electromagnet as described in claim 1, characterized in that: The coil (6) adopts a hollow coil design without plastic frame and is wound through a row arrangement process.

7. The miniature mobile phone electromagnet as described in claim 1, characterized in that: The capillary tube (8) is made of 304 stainless steel and has an outer diameter of 1.3 mm and an inner diameter of 1.1 mm.

8. The miniature mobile phone electromagnet as described in claim 1, characterized in that: The flexible circuit board (7) is 0.1 mm thick and is welded to the coil (6) by pressure welding.

9. The miniature mobile phone electromagnet as described in claim 2, characterized in that: The outer diameter of the outer shell (1) is 3.5 mm and the length is 6.6 mm.

10. The miniature mobile phone electromagnet as described in claim 1, characterized in that: The flexible circuit board (7) is bonded to the fixed iron core (9), and a UV adhesive layer (15) is encapsulated on the flexible circuit board (7). The UV adhesive layer (15) covers and wraps the welding joint between the connecting wire (12) and the flexible circuit board (7).

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