VCM motor laser cutting protection structure, VCM motor, camera and electronic device

Abstract

The utility model relates to a kind of VCM motor laser cutting protection structure, VCM motor, camera and electronic equipment, VCM motor laser cutting protection structure includes spring contact piece, spring contact piece is connected with material band by connecting bridge area, the connecting bridge area includes the cutting guide section of width narrower than other areas.The utility model provides a kind of VCM motor laser cutting protection structure, VCM motor, camera and electronic equipment, and the base damage when laser cutting spring contact piece is connected with material, cutting positioning misalignment and short-circuit risk problem are solved by mechanical structure innovation.

Description

Technical Field

[0001] This utility model relates to the field of micro motor manufacturing technology, and in particular to a laser cutting protection structure for a VCM motor, a VCM motor, a camera, and electronic equipment. Background Technology

[0002] In the manufacturing of miniature voice coil motors (VCM motors), spring contacts (often also called lower springs), as key electrical connections and elastic support components, are commonly manufactured on a large scale using a connection to a continuous carrier tape (often called a continuous material or carrier tape connection) to facilitate automated assembly. After the motor body is assembled, a high-energy laser beam is used to precisely separate the spring contacts from the carrier tape (often called "laser cutting of the continuous material" or "laser unloading").

[0003] However, existing conventional VCM motor manufacturing processes have several significant and interrelated technical drawbacks in the laser cutting process for spring contact plates: Damage to the plastic base: During the cutting of metal strips by high-energy lasers, intense heat accumulation and molten metal splashes are generated. Due to the lack of effective physical protection mechanisms, this scattered heat, reflected laser beams, and high-temperature molten material can easily scorch the adjacent or directly below plastic base (usually made of engineering plastics such as PBT and LCP). This burning can range from minor issues like surface melting and deformation, resulting in scorch marks and affecting product appearance and dimensional accuracy, to severe cases causing localized carbonization of the plastic material and deterioration of structural strength, ultimately impacting the assembly reliability and long-term service life of the entire motor.

[0004] Cutting accuracy and failure assessment issues: Traditional material connection zone structures are typically designed as narrow bridges with uniform width (uniform width material connection design). This design significantly increases the risk of incomplete cutting (i.e., "false cuts" or "micro-connections") when there are slight deviations in the laser cutting path (such as those caused by equipment vibration, positioning errors, or material thermal deformation). More importantly, due to the lack of effective visual or mechanical discrimination features, operators and automated optical inspection (AOI) systems struggle to quickly and accurately identify these defective products with off-center cutting positions but seemingly cut surfaces on high-speed production lines. These undetected and unremoved defective products flow into subsequent processes, ultimately leading to functional defects in the finished product.

[0005] Short-circuit risk: After laser cutting, the separation point between the spring contact and the strip will create dimensionally unstable metal residue (commonly referred to as "tailings," "connecting ribs," or "burrs"). Current processes lack effective control and isolation measures for the length and location of this residual metal. Especially when the motor's metal housing (Housing or Yoke) is tightly fitted onto the plastic base, these uncontrollable metal residues are highly susceptible to contact with or even short-circuiting to the inner wall of the metal housing under conditions of vibration, assembly tolerances, or temperature changes. Since the spring contact typically carries the current from the drive coil, this contact creates a low-impedance short-circuit path, potentially leading to motor malfunction or, in severe cases, damage to the drive circuit, posing significant product safety hazards and customer complaint risks.

[0006] The aforementioned technical deficiencies severely restrict the improvement of VCM motor production yield, cost reduction, and the guarantee of electrical safety in the final product. Therefore, there is an urgent need for an integrated and structured solution that can effectively protect the plastic base from heat damage during the laser cutting process, improve cutting accuracy and the intuitiveness of failure identification, and fundamentally eliminate the risk of short circuits caused by cutting residue. Utility Model Content

[0007] In view of this, this utility model provides a VCM motor laser cutting protection structure, which solves the problems of base damage, inaccurate cutting positioning and short circuit risk when laser cutting spring contact pieces are connected through mechanical structure innovation.

[0008] The objective of this utility model is achieved through the following technical solution: A VCM motor laser cutting protection structure includes a spring contact piece, which is connected to the material strip via a connecting bridge area, the connecting bridge area including a cutting guide section that is narrower than other areas.

[0009] Preferably, it also includes a plastic base, the surface of which is provided with a clearance groove corresponding to the material connection position of the spring contact piece; the length of the cutting guide section satisfies that the minimum distance between its end and the inner wall of the metal shell is always greater than zero.

[0010] The recessed grooves in the plastic base provide physical isolation during laser cutting, allowing scattered laser energy to attenuate and dissipate within the groove cavity, completely preventing burns to the plastic material. The narrow-width design of the cutting guide section forms a natural focusing and guiding channel, ensuring the laser beam accurately targets the predetermined fracture location. Compared to traditional uniform-width continuous material structures, this significantly reduces the risk of cutting position deviation. Its core innovation lies in establishing safety redundancy in the uncut state—even if the cutting process completely fails, the radial gap between the end of the cutting guide section and the metal shell automatically maintains electrical isolation. This triple structure—the recessed grooves, the narrow width of the cutting guide section, and the specific length of the cutting guide section—works together to achieve a dual protection mechanism of "cutting protection + uncut protection," simultaneously addressing base damage and cutting accuracy issues without adding extra inspection procedures, and effectively eliminating the short-circuit risk caused by cutting failures in traditional processes.

[0011] Preferably, the outline of the recessed groove completely covers the orthographic projection area of ​​the cutting guide section on the surface of the plastic base.

[0012] Full projection coverage ensures that when the cutting guide section is penetrated by the laser at any position, the molten material and scattered light are confined within the groove boundary; the precise matching of the groove contour with the heat-affected zone maximizes protection efficiency and avoids local overheating that could lead to plastic deformation; the full coverage feature allows the laser equipment to freely adjust the path within the cutting guide section, improving process flexibility; the groove boundary serves as a visual positioning benchmark, assisting the laser calibration system in quickly identifying the cutting area.

[0013] Preferably, the width of the cutting guide segment is less than the minimum width of other parts in the connecting bridge area.

[0014] Width variation creates an intelligent error prevention mechanism: when the laser deviates to other parts, the energy density is insufficient to melt the wide area, and the spring contact piece still maintains physical connection with the strip, forming a defect mark that can be seen with the naked eye; the narrow width of the cutting guide section reduces the energy threshold required for cutting and reduces the transmission of heat-affected zone to the spring contact piece body; the differential width design optimizes the stress distribution of the material, the stress concentration in the narrow area achieves clean fracture, and the wide area maintains the stability of strip transmission.

[0015] Preferably, the cutting guide section is arranged along the extension direction of the material strip, and its length is designed to ensure that the minimum distance from the end of the residual section after laser cutting to the inner wall of the metal shell is always greater than zero.

[0016] The design, which aligns the length direction with the strip, ensures that the cutting guide section remains linear under strip tension, preventing gap failure caused by twisting. The characteristic of a constant end distance greater than zero ensures that safety protection is independent of cutting precision—regardless of the cutting position offset, the uncut section always constitutes a short-circuit barrier. This distance design is compatible with the thermal expansion deformation of the metal casing, maintaining reliable isolation even in high-temperature environments. The constant positive distance simplifies electrical safety verification to geometric dimension testing.

[0017] Preferably, the connecting bridge area includes a wide fixed section and a narrow cutting section arranged sequentially along the extension direction of the material strip. The wide fixed section connects to the material strip, and the narrow cutting section constitutes the cutting guide section, which directly connects to the spring contact sheet body.

[0018] The two-section structure achieves functional integration: the wide fixed section provides bending stiffness to ensure that the material belt does not break during high-speed transmission; the narrow cutting section simultaneously undertakes laser guidance and safety gap control; the direct connection design eliminates stress concentration points in the transition zone and improves the fatigue resistance of the spring contact piece; the simplified structure reduces processing difficulty, and the straight cutting path improves laser scanning efficiency.

[0019] Preferably, the sidewall of the clearance groove is a conical clearance surface that expands outward from the bottom of the groove.

[0020] The conical surface creates a laser energy attenuation channel: the incident beam is reflected and attenuated between the opposite conical surfaces; the cone angle design guides the molten material to converge towards the center of the groove, preventing splashes from sticking back to the functional components; the expansion structure increases the heat dissipation surface area and accelerates convection cooling; the conical surface provides a natural draft angle during injection molding, avoiding damage to the groove edge by ejector pins.

[0021] Preferably, the minimum value of the radial safety clearance at any position in the circumferential direction of the metal housing is greater than zero.

[0022] The minimum circumferential value guarantee covers the housing manufacturing tolerances: continuous isolation is maintained even under elliptic deformation conditions; the limit definition of greater than zero allows miniaturized motor designs to be designed without sacrificing safety margins; this feature transforms gap detection into a measurement of the minimum distance between the housing and the cut guide section, confirming short-circuit protection reliability without power-on testing.

[0023] A VCM motor includes a VCM motor laser cutting protection structure and a metal housing as described above. The metal housing is fitted onto the outside of a plastic base, and the minimum distance between its inner wall and the end of the cutting guide section forms a fixed short-circuit protection gap.

[0024] The self-locking characteristic means that the gap size is fixed by the assembly relationship between the plastic base and the shell, and is independent of subsequent processes; the sleeve structure forms a mechanical constraint, so that the gap fluctuation amplitude is less than micrometer level under vibration environment; the shell acts as a Faraday cage to shield the coil from the interference of laser electromagnetic pulses; the overall modular design allows the safety performance to be verified offline.

[0025] A camera that includes a VCM motor as described above.

[0026] Inheriting the laser-cut protection characteristics of the VCM motor, it ensures zero short-circuit risk during the manufacturing process of the camera autofocus module; the protective structure does not increase the size of the motor, maintaining the thinness of the camera module; component-level safety verification simplifies the whole-machine testing process.

[0027] An electronic device comprising a camera as described above.

[0028] By extending structural protection to the end-product level, electronic devices gain a maintenance-free circuit safety mechanism; the protective features remain effective throughout the entire life cycle of the device, avoiding short-circuit failures caused by manufacturing defects; and patent protection covers the entire industry chain from parts to complete machines.

[0029] The advantages of this utility model compared to the prior art are: Damage protection: The added groove structure can absorb scattered laser energy, preventing the plastic substrate from melting due to thermal effects and significantly improving the substrate yield.

[0030] Intelligent cutting self-inspection: When the cutting path deviates, the uncut fixed segment automatically forms a visual connection structure, directly exposing the processing abnormality and realizing process self-inspection and error prevention.

[0031] Short circuit protection: The length of the extension section is optimized through thermal deformation simulation to ensure a safe distance between the cutting residue and the shell, effectively eliminating the risk of short circuit.

[0032] Cost optimization: Improved yield reduces raw material loss, and self-inspection features replace manual full inspection processes, saving labor costs. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a structural diagram of a VCM motor laser cutting protection structure according to an embodiment of the present invention.

[0035] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0036] Figure 3 This is a three-dimensional structural diagram of a VCM motor laser cutting protection structure according to an embodiment of the present invention.

[0037] Labeling description: Plastic base 1, clearance groove 11, spring contact piece 2, connecting bridge area 21, cutting guide section 211, wide fixing section 212, metal shell 3. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0040] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0042] The technical solutions in this application will now be described with reference to the accompanying drawings. Example 1

[0043] This embodiment provides a VCM motor laser cutting protection structure, including a plastic base 1 and a spring contact piece 2. The surface of the plastic base 1 is provided with a clearance groove 11 corresponding to the material connection position of the spring contact piece 2. The spring contact piece 2 is connected to the material strip through a connecting bridge area 21. The connecting bridge area 21 includes a cutting guide section 211 with a width narrower than other areas. The length of the cutting guide section 211 satisfies the following condition: the minimum distance between its end and the inner wall of the metal shell is always greater than zero.

[0044] The recessed groove 11 of the plastic base 1 provides physical isolation space during laser cutting, allowing the scattered laser energy to attenuate and dissipate within the groove cavity, completely preventing burns to the plastic material. The narrow width design of the cutting guide section 211 forms a natural focusing guide channel, ensuring that the laser beam accurately targets the predetermined fracture position, significantly reducing the risk of cutting position deviation compared to traditional uniform-width continuous material structures. The core innovation of its specific length configuration lies in establishing a safety redundancy in the uncut state—even if the cutting process completely fails, the radial gap between the end of the cutting guide section 211 and the metal shell 3 automatically maintains electrical isolation. The triple structure (recessed groove 11, narrow width of the cutting guide section 211, and specific length of the cutting guide section 211) synergistically achieves a dual protection mechanism of "cutting protection + uncut protection," simultaneously solving base damage and cutting accuracy issues without adding extra inspection procedures and effectively eliminating the short-circuit risk caused by cutting failures in traditional processes.

[0045] In this embodiment, the outline of the clearance groove 11 completely covers the orthographic projection area of ​​the cutting guide section 211 on the surface of the plastic base 1.

[0046] Full projection coverage ensures that when the cutting guide section 211 is penetrated by the laser at any position, the molten material and scattered light are confined within the groove boundary; the precise matching of the groove contour with the heat-affected zone maximizes protection efficiency and avoids local overheating that could lead to plastic deformation; the full coverage feature allows the laser equipment to freely adjust its path within the cutting guide section 211, improving process flexibility; the groove boundary serves as a visual positioning reference, assisting the laser calibration system in quickly identifying the cutting area.

[0047] In this embodiment, the width of the cutting guide segment 211 is less than the minimum width of other parts in the connecting bridge area 21.

[0048] Width variation creates an intelligent error prevention mechanism: when the laser deviates to other parts, the energy density is insufficient to melt the wide area, and the spring contact piece 2 still maintains physical connection with the material strip, forming a defect mark that can be seen with the naked eye; the narrow width of the cutting guide section 211 reduces the energy threshold required for cutting and reduces the transmission of heat-affected zone to the body of the spring contact piece 2; the differential width design optimizes the stress distribution of the material, the stress concentration in the narrow area achieves clean fracture, and the wide area maintains the stability of material strip transmission.

[0049] In this embodiment, the cutting guide section 211 is arranged along the extension direction of the strip, and its length is designed to ensure that the minimum distance from the end of the residual section after laser cutting to the inner wall of the metal shell 3 is always greater than zero.

[0050] The design of the length direction being consistent with the strip ensures that the cutting guide section 211 remains linear under the tension of the strip, avoiding gap failure caused by twisting; the characteristic that the end distance is always greater than zero makes safety protection independent of cutting accuracy - no matter how the cutting position is offset, the uncut section always constitutes a short circuit barrier; this distance design is compatible with the thermal expansion deformation of the metal shell 3, and still maintains reliable isolation in high temperature environments; the constant positive distance simplifies electrical safety verification to geometric dimension inspection.

[0051] In this embodiment, the connecting bridge area 21 includes a wide fixing section 212 and a narrow cutting section 211 arranged sequentially along the extension direction of the material strip. The wide fixing section 212 connects to the material strip, and the narrow cutting section 211 constitutes a cutting guide section 211, which is directly connected to the body of the spring contact piece 2.

[0052] The two-section structure achieves functional integration: the wide fixed section 212 provides bending stiffness to ensure that the material belt does not break during high-speed transmission; the narrow cutting section 211 simultaneously undertakes laser guidance and safety gap control; the direct connection design eliminates stress concentration points in the transition area and improves the fatigue resistance of the spring contact piece 2; the simplified structure reduces the processing difficulty, and the straight cutting path improves the laser scanning efficiency.

[0053] In this embodiment, the sidewall of the clearance groove 11 is a conical clearance surface that expands outward from the bottom of the groove.

[0054] The conical surface creates a laser energy attenuation channel: the incident beam is reflected and attenuated between the opposite conical surfaces; the cone angle design guides the molten material to converge towards the center of the groove, preventing splashes from sticking back to the functional components; the expansion structure increases the heat dissipation surface area and accelerates convection cooling; the conical surface provides a natural draft angle during injection molding, avoiding damage to the groove edge by ejector pins.

[0055] In this embodiment, the minimum value of the radial safety clearance at any position in the circumference of the metal housing is greater than zero.

[0056] The minimum circumferential value guarantee covers the housing manufacturing tolerances: continuous isolation is maintained even under elliptic deformation conditions; the limit definition of greater than zero allows miniaturized motor designs to be designed without sacrificing safety margins; this feature transforms gap detection into a minimum distance measurement between the housing and the cut guide section 211, confirming short-circuit protection reliability without power-on testing. Example 2

[0057] This embodiment discloses a complete VCM motor including the laser cutting protection structure for the VCM motor as described in Embodiment 1. The core feature of this VCM motor is its integration of the aforementioned protection structure and a matching metal housing 3. Specifically, the metal housing 3 is tightly fitted onto the outside of the plastic base 1, forming the overall frame structure of the VCM motor. In this assembly relationship, a crucial physical gap is naturally formed and maintained between the inner wall of the metal housing 3 and the end of the cutting guide section 211 on the spring contact piece 2 through the specific length configuration described in Embodiment 1. This gap is defined as a "fixed short-circuit protection gap".

[0058] This "self-locking" characteristic stems from its formation mechanism: the size of the gap does not depend on subsequent cutting precision or manual adjustment, but is predetermined and fixed by the inherent, precisely controlled assembly geometry between the plastic base 1 and the metal housing 3. Once the two are assembled, the size of the gap is locked, unaffected by the success or failure of subsequent laser cutting processes. The housing structure of the metal housing 3 not only provides robust mechanical support and electromagnetic shielding (e.g., acting as a Faraday cage to suppress interference from electromagnetic pulses that may be generated during laser cutting on the internal coils), but its inner wall also serves as a reference plane for the gap, forming a physical barrier to prevent electrical short circuits together with the end of the cutting guide section 211. Even under vibration, due to the rigid constraints of the structure, the fluctuation amplitude of this gap is extremely small, far below the threshold that may cause a short circuit risk. This integrated modular design concept allows the short-circuit protection performance of the VCM motor to be reliably confirmed after assembly, or even offline, through simple geometric measurement (verifying whether the minimum distance is always greater than zero), without the need for complex power-on tests, greatly improving production efficiency and the convenience of reliability verification. Example 3

[0059] This embodiment discloses a camera module whose core driving component includes a VCM motor with a built-in laser cutting protection mechanism, as described in Embodiment 2. By directly integrating this VCM motor, especially its autofocus module, the camera fully inherits all the structural protection advantages and safety features described in Embodiments 1 and 2. This means that throughout the entire manufacturing process of the camera module, especially in the critical process involving the laser cutting of the spring contact piece, this protective structure can continuously exert its multiple protective functions: effectively preventing accidental damage to the plastic base 1 by the laser, significantly improving the accuracy of cutting positioning and process fault tolerance, and fundamentally eliminating the risk of short circuit caused by the spring contact piece 2 touching the metal shell 3 due to laser cutting failure (whether offset or residue), achieving "zero short circuit risk" assurance in the manufacturing process.

[0060] Most importantly, the ingenuity of this protective structure lies in the fact that its protective function is achieved entirely independently of adding physical dimensions or structural complexity to the VCM motor or camera module. The clearance groove 11, the cut guide section 211 of a specific width, and their length configuration in Embodiment 1 are all optimized designs within the constraints of the existing VCM motor's internal space. Therefore, the camera module maintains its crucial thinness and lightness, meeting the increasingly stringent miniaturization requirements of modern mobile devices. Furthermore, since the VCM motor itself already possesses verifiable short-circuit protection at the component level (as described in Embodiment 2), this significantly simplifies the testing and verification process for the entire camera unit, eliminating the need for additional, complex whole-unit-level testing steps to address this potential short-circuit risk, thereby reducing overall manufacturing costs and improving production efficiency. Example 4

[0061] This embodiment discloses an electronic device whose imaging system includes a camera, as described in Embodiment 3, integrating a VCM motor with a laser-cut protective structure. By applying a camera incorporating the innovative structure described in Embodiments 1 to 3 to electronic devices (such as smartphones, tablets, portable cameras, security monitoring equipment, etc.), the mechanical protection mechanism provided by this invention is effectively extended and covers the final end-product level. This allows the electronic device to obtain a built-in, maintenance-free circuit safety protection mechanism at the manufacturing source of its key internal component—the camera.

[0062] The core value of this structural protection lies in its durability and inherent reliability: the "fixed short-circuit gap," guaranteed by specific structural dimensions, operates effectively throughout the entire lifecycle of the electronic device (from manufacturing to final disposal). Its protective function is independent of the state of electronic components, software operation, or user intervention; it is a purely physical isolation guarantee. It fundamentally prevents potential short-circuit hazards caused by defects in the laser cutting process during VCM motor manufacturing (such as excessive material residue). Such hazards, in traditional processes, can lead to sudden equipment failures, functional abnormalities, or even safety risks during use. The structural design of this invention addresses this problem step-by-step at the component level (Embodiment 1), component level (Embodiment 2), and subsystem level (Embodiment 3), ultimately achieving a reliable safety closed loop at the overall machine level (Embodiment 4). This comprehensive protection design, from core components to the complete end product, ensures that patent protection covers the entire industry chain of related technologies, providing comprehensive intellectual property protection for everyone from component suppliers to complete machine manufacturers.

[0063] 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective structure for laser cutting of a VCM motor, characterized in that, The device includes a spring contact piece (2) and a plastic base (1). The spring contact piece (2) is connected to the material strip through a connecting bridge area (21). The connecting bridge area (21) includes a cutting guide section (211). The width of the cutting guide section (211) is less than the minimum width of other parts in the connecting bridge area (21). The surface of the plastic base (1) is provided with a clearance groove (11) corresponding to the material connection position of the spring contact piece. The cutting guide section (211) is set along the extension direction of the material strip. Its length is designed to ensure that the minimum distance from the end of the residual section after laser cutting to the inner wall of the metal shell (3) is always greater than zero.

2. The VCM motor laser cutting protection structure according to claim 1, characterized in that, The outline of the recessed groove (11) completely covers the orthographic projection area of ​​the cutting guide section (211) on the surface of the plastic base.

3. The VCM motor laser cutting protection structure according to claim 1, characterized in that, The connecting bridge area (21) includes the following components arranged sequentially along the extension direction of the conveyor belt: Wide fixed section (212), connecting material strip; The narrow cutting section constitutes the cutting guide section (211), which is directly connected to the spring contact plate body.

4. The VCM motor laser cutting protection structure according to claim 1, characterized in that, The sidewall of the clearance groove (11) is a clearance surface that expands outward from the bottom of the groove.

5. A VCM motor, characterized in that, It includes a VCM motor laser cutting protection structure and a metal housing as described in any one of claims 1-4. The metal housing is fitted on the outside of the plastic base (1), and the minimum distance between its inner wall and the end of the cutting guide section (211) forms a fixed anti-short circuit gap.

6. A camera, characterized in that, It includes the VCM motor as described in claim 5.

7. An electronic device, characterized in that, Includes the camera as described in claim 6.

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