Transmission screw, camera module and electronic equipment

Abstract

The utility model discloses a transmission screw, a camera module and electronic equipment, the transmission screw is applied to the camera module, the camera module comprises a driving part, the transmission screw comprises a first end and a second end which are oppositely arranged along a first direction, the peripheral surface of the first end is provided with a spirally arranged external thread, and the first end is configured to be connected to the driving part. The lead P of the external threads ranges from 0.4 mm to 0.8 mm, and the tooth height H of the external threads ranges from 0.1 mm to 0.5 mm. The transmission screw, the camera module and the electronic equipment provided by the utility model have certain self-locking performance and can meet the transmission efficiency and the transmission precision at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of imaging technology, in particular to a transmission screw, a camera module and an electronic device. BACKGROUND

[0002] At present, the lens of optical auto-focusing and optical anti-shake needs to be matched with transmission and transmission screw during use, and a driving device is usually used to drive the transmission to rotate, so that the transmission screw and the lens on the transmission move, and the lens realizes the change of optical performance. However, the transmission efficiency of the transmission screw used in the market at present is low, and the self-locking property is poor, which affects the transmission accuracy. CONTENT OF THE INVENTION

[0003] The present application discloses a transmission screw, a camera module and an electronic device, which can meet the transmission efficiency and transmission accuracy while having a certain self-locking property.

[0004] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses a transmission screw, which is applied to a camera module, and the camera module comprises a driving member.

[0005] The transmission screw comprises a first end and a second end which are oppositely arranged along a first direction, and an outer thread is arranged on the outer circumferential surface of the first end in a spiral manner, and the first end is configured to be connected to the driving member.

[0006] The lead P of the outer thread is 0.4mm-0.8mm, and the tooth height H of the outer thread is 0.1mm-0.5mm.

[0007] As an optional implementation manner, in the embodiment of the first aspect of the present application, the tooth profile of the outer thread is trapezoidal.

[0008] As an optional implementation manner, in the embodiment of the first aspect of the present application, the tooth profile angle α of the outer thread is 29.5°-30.5°.

[0009] As an optional implementation manner, in the embodiment of the first aspect of the present application, the spiral angle φ of the outer thread is 3.27°-9.27°.

[0010] As an optional implementation manner, in the embodiment of the first aspect of the present application, the outer thread is configured to be connected with the inner thread of a transmission nut in a matching manner, the single-side radial backlash L1 of the outer thread and the inner thread is 0.0125mm-0.0225mm, and / or the single-side axial backlash L2 of the outer thread and the inner thread is 0.023mm-0.026mm.

[0011] As an optional implementation, in the embodiment of the first aspect of the present application, the outer thread has a tooth crest width W1 of 0.15mm-0.19mm, and / or the outer thread has a tooth root width W2 of 0.22mm-0.26mm.

[0012] As an optional implementation, in the embodiment of the first aspect of the present application, the first end is provided with a slot extending in the direction of the second end, and the slot penetrates along the radial direction of the first end, and the driving member is connected to the slot.

[0013] In a second aspect, the present application further discloses a camera module, comprising a lens, a driving member, and the transmission screw rod as described in the first aspect above, the driving member being connected to the transmission screw rod, the lens being in transmission connection with the transmission screw rod, and the transmission screw rod being driven to move by the driving member to drive the lens to move.

[0014] As an optional implementation, in the embodiment of the second aspect of the present application, the number of the transmission screw rods is multiple, and the starting point of the outer thread of each transmission screw rod has the same coordinate value relative to the coordinate point of the transmission screw rod.

[0015] In a third aspect, the present application further discloses an electronic device, comprising a shell and the camera module as described in the second aspect above, and the camera module is arranged in the shell.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The present application provides a transmission screw rod, a camera module, and an electronic device. By controlling the lead of the outer thread of the transmission screw rod to be 0.4mm-0.8mm, the outer thread of the transmission screw rod can only be driven by the transmission nut when cooperating with the inner thread of the transmission nut, and the two are not easy to rotate relative to each other under the action of other external forces, thereby improving the self-locking capability. At the same time, the lead of the transmission screw rod is limited within a reasonable range, so that the transmission screw rod can meet the performance requirements of transmission efficiency and transmission accuracy. Within this range, the outer thread of the transmission screw rod will not have too large a stroke and too fast a speed when rotating one circle, thereby resulting in high transmission efficiency and low transmission accuracy. Moreover, the transmission screw rod will not have too small a stroke and too slow a speed when rotating one circle, thereby resulting in high transmission accuracy and slow transmission efficiency.

[0018] Furthermore, by limiting the tooth height of the external thread to 0.1mm to 0.5mm, the contact area between the external thread and the internal thread of the transmission nut can be kept within a reasonable range, thereby ensuring the friction and torque transmitted, which is conducive to meeting the requirements of transmission efficiency. Moreover, by limiting the tooth height of the external thread to a reasonable range, the external thread has sufficient structural strength while saving the design space of the transmission screw and making it easier to process the external thread of the transmission screw. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the camera module disclosed in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the transmission screw disclosed in an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the transmission screw and transmission nut assembly disclosed in an embodiment of this application;

[0023] Figure 4 This is a front view of the transmission screw disclosed in an embodiment of this application;

[0024] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 This is a cross-sectional view of the transmission screw disclosed in an embodiment of this application;

[0026] Figure 7 for Figure 3 A sectional view and a partially enlarged schematic diagram at point AA;

[0027] Figure 8 This is a side view of the first end of the transmission screw disclosed in an embodiment of this application;

[0028] Figure 9 This is a structural diagram of a mobile phone when the electronic device disclosed in the embodiments of this application is a mobile phone.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100, drive screw; 10a, first end; 10b, second end; 10c, coordinate point; 101, external thread; 102, slot; 103, starting point; P, lead; H, height of tooth; φ, helix angle; a, tooth profile angle; L1, single-side radial backlash; L2, single-side axial backlash; W1, addendum width; W2, dedendum width; X, first direction;

[0031] 200, camera module; 201, driving member; 202, lens; 202a, lens body; 203, drive nut; 203a, internal thread; 300, electronic device; 301, housing. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] In the present application, the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0034] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0035] In addition, the terms "provided with", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0036] In addition, the terms "first", "second" and the like are mainly used to distinguish different devices, elements or components (the specific types and structures can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0037] The technical solutions of the present application will be further described below in combination with embodiments and drawings.

[0038] Please refer to Figure 1 The embodiment of the present application discloses a camera module 200, which can include a lens 202, a driving member 201 and a transmission screw 100. The driving member 201 is connected with the transmission screw 100, and the lens 202 is in transmission connection with the transmission screw 100. The transmission screw 100 moves under the driving action of the driving member 201 to drive the lens 202 to move.

[0039] It can be understood that the camera module 200 provided by the embodiment of the present application needs to be in transmission connection with the lens 202 through the transmission screw 100 when in use. The lens 202 moves under the driving action of the driving member 201 to realize the optical zoom and automatic focusing performance of the camera module 200.

[0040] In order to realize the movement of the lens 202 under the transmission action of the transmission screw 100, in some possible embodiments, the lens 202 can include a lens body 202a and a transmission nut 203. The transmission nut 203 is connected to the outer periphery of the lens body 202a, and the transmission nut 203 is in threaded connection with the transmission screw 100 to realize the threaded connection between the transmission screw 100 and the lens 202. Under the driving action of the driving member 201, the transmission screw 100 rotates, so that the transmission nut 203 connected with the transmission screw 100 moves along the first direction X (the axial direction of the transmission screw 100, such as Figure 1 the up-down direction of the paper) to drive the lens body 202a to move. Thus, through the transmission connection between the transmission nut 203 and the transmission screw 100, the rotary motion is converted into the linear motion required by the lens 202, so as to realize the change of the optical performance of the lens 202.

[0041] Optionally, the lens body 202a and the transmission nut 203 can be integrally formed. Of course, in other embodiments, the lens body and the transmission nut 203 can also be separately arranged, and the separate arrangement of the lens body and the transmission nut 203 is realized through the threaded connection, so as to realize the synchronous movement. As long as the lens 202 is formed with threads to be in transmission connection with the transmission screw 100 and can move under the driving action of the driving member 201, the specific structure form is not limited in the embodiment of the present application.

[0042] Optionally, the driving member 201 can be an AF (Auto Focus) motor. Of course, in other embodiments, the driving member 201 can also be an anti-shake motor, which can be a voice coil motor, a stepper motor, etc. A suitable driving member 201 can be selected according to actual needs, and the specific type is not limited in the embodiments of the present application.

[0043] In some embodiments, the camera module 200 can further include an image sensor (not shown). Wherein the lens body 202a can include a lens barrel (not shown) and at least one lens (not shown) connected to the lens barrel, the lens and the image sensor are arranged along the optical axis direction. Understandably, the transmission screw 100 can be in driving connection with the lens barrel.

[0044] Under the driving action of the driving member 201, the transmission screw 100 rotates, so that the lens barrel on the transmission screw 100 is displaced, thereby driving the lens to move relative to the image sensor along the optical axis direction. As a result, the distance between the lens 202 and the image sensor changes, so that the light rays processed by the lens 202 entering the image sensor can present different imaging effects.

[0045] Please refer to Figure 2 and Figure 3 In some possible embodiments, the transmission screw 100 includes a first end 10a and a second end 10b arranged opposite along a first direction X, an outer periphery surface of the first end 10a is provided with an outer thread 101 arranged in a spiral, and the first end 10a is configured to be connected to the driving member 201. Wherein the outer thread 101 can be in mating connection with the inner thread 203a on the transmission nut 203.

[0046] Wherein the first direction X is the axial direction of the transmission screw 100.

[0047] In the transmission mechanism, a smaller lead usually means higher precision and smoother movement, but it can also result in lower transmission speed, resulting in lower transmission efficiency. On the contrary, a larger lead can provide faster transmission speed, but it may sacrifice certain precision and smoothness.

[0048] In order to be able to balance the higher transmission efficiency and transmission precision of the transmission screw 100, in some possible embodiments, referring to Figure 4 and Figure 5 , the lead P of the outer thread 101 is 0.4mm-0.8mm. Optionally, the lead P of the outer thread 101 can be 0.4mm-0.7mm, 0.4mm-0.6mm, 0.5mm-0.6mm, or 0.495mm-0.505mm, etc. For example, the lead P of the outer thread 101 can be 0.4mm, 0.5mm, or 0.6mm, 0.7mm or 0.8mm, etc.

[0049] By controlling the lead of the external thread 101 of the transmission screw 100 to be 0.4mm-0.8mm, within this range, the external thread 101 of the transmission screw 100 will not be too large in lead, so that the stroke of a rotation is too large, the speed is too fast, thereby resulting in high transmission efficiency, low transmission precision; and the transmission screw 100 will not be too small in lead, so that the stroke of a rotation is too small, the speed is too slow, thereby resulting in high transmission precision, slow transmission efficiency. Thus, when the external thread 101 of the transmission screw 100 cooperates with the internal thread 203a of the transmission nut 203, it can only be driven by the transmission screw 100 to drive the transmission nut 203, and the two are not easy to rotate relative to each other under the action of other external forces, thereby improving the self-locking ability. At the same time, limiting the lead of the transmission screw 100 to a reasonable range makes the transmission screw 100 be able to meet the performance requirements of transmission efficiency and transmission precision, thereby being able to ensure the movement precision of the lens 202 in the camera module 200, which is conducive to the stability of the optical performance of the camera module 200 as a whole, and also conducive to the focusing effect of the camera module 200.

[0050] Specifically, if the lead P exceeds 0.8mm, the lead of the transmission screw 100 is too large, which will cause the transmission screw 100 to rotate one circle to result in too large stroke of the transmission nut 203, and the transmission speed is too fast, although it can improve the transmission efficiency, but it will result in low transmission precision, which is not conducive to the stability of the optical performance of the camera module 200. If the lead P is lower than 0.4mm, the lead of the transmission screw 100 is too small, which will cause the transmission screw 100 to rotate one circle to result in too small stroke of the transmission nut 203, and the transmission speed is too slow, although it can improve the transmission precision, but it will result in low transmission efficiency, which is not conducive to the fast zoom of the camera module 200.

[0051] Preferably, the lead P of the external thread 101 can be 0.5mm, so that the transmission effect of the transmission screw 100 is better.

[0052] In some possible embodiments, the height H of the external thread 101 is 0.1mm-0.5mm. Alternatively, the height H of the external thread 101 can be 0.1mm-0.4mm, 0.1mm-0.3mm, or 0.1mm-0.2mm, etc. For example, the height H of the external thread 101 can be 0.1mm, 0.16mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, etc.

[0053] By limiting the height of the external thread 101 to 0.1mm-0.5mm, the contact area of the external thread 101 when cooperating with the internal thread 203a of the transmission nut 203 can be within a reasonable range, thereby ensuring the friction force of the transmission and the torque transmitted, thereby facilitating the demand for transmission efficiency, and by limiting the height of the external thread 101 within a reasonable range, the external thread 101 has sufficient structural strength while facilitating the design space of the transmission screw 100, and facilitating the machining of the external thread 101 of the transmission screw 100.

[0054] Preferably, the height H of the external thread 101 can be 0.16mm, so that the transmission screw 100 meets the characteristics of transmission efficiency and structural strength at the same time.

[0055] It can be seen that when the lead P of the external thread 101 of the transmission screw 100 is 0.4mm-0.8mm and the height H is 0.1mm-0.5mm, the transmission precision and transmission efficiency of the transmission screw 100 can be improved, and the transmission screw 100 has higher structural strength, and the stability and reliability of the optical performance of the camera module 200 are improved.

[0056] Continuing to refer to Figures 2 to 4 In some possible embodiments, the first end 10a is provided with a slot 102 extending in the direction of the second end 10b, and the slot 102 penetrates along the radial direction of the first end 10a, and the driving member 201 is connected to the slot 102. By providing a slot 102 at one end of the transmission screw 100 and connecting it with the driving member 201, the slot 102 can provide a stable support point for the output shaft of the driving member 201, ensuring that the connection between the transmission screw 100 and the driving member is firm and reliable, preventing loosening or falling off during operation. In addition, the design of the slot 102 makes it easier to install and adjust the transmission screw 100. Through the slot 102, the transmission screw 100 can be more easily connected with the driving member 201, and during maintenance or replacement, it can also be more convenient to operate.

[0057] In addition, the connection with the driving member 201 through the slot 102 does not affect the arrangement of the external thread 101 on the outer periphery of the transmission screw 100, and under the premise of ensuring that it has sufficient movement stroke with the transmission nut 203, the layout between the driving member 201 and the lens 202 can be more compact.

[0058] In some possible embodiments, referring to Figure 4The helix angle φ of the external thread 101 is 3.27°-9.27°. Alternatively, the helix angle φ of the external thread 101 can be 3°-9°, 3°-7°, 5°-9°, or 5°-8°, etc. For example, the helix angle φ of the external thread 101 can be 3.27°, 5°, 6.27°, 8°, or 9.27°, etc. By limiting the helix angle of the external thread 101 of the transmission thread to be small, the friction of the transmission screw 100 is increased, and the transmission screw 100 is not easy to move by itself when subjected to an axial force, further improving the self-locking performance of the transmission screw 100.

[0059] Preferably, the helix angle φ of the external thread 101 can be 6.27°, which can make the self-locking performance of the transmission screw 100 better.

[0060] In some possible embodiments, the tooth profile of the external thread 101 is trapezoidal. That is, the cross-sectional shape of the external thread 101 of the transmission screw 100 is trapezoidal, and the trapezoidal tooth profile can enhance the load-carrying capacity of the external thread 101 and optimize the transmission efficiency. In addition, the trapezoidal external thread 101 has a larger contact area when cooperating with the internal thread 203a of the transmission nut 203, can efficiently transmit large torque and axial force, and can make the stress distribution more uniform, so that the transmission screw 100 is not easy to loosen and break during transmission, ensuring the stability and reliability of the transmission.

[0061] In the transmission system in which the transmission screw 100 cooperates with the transmission nut 203, when the tooth profile angle of the thread is too large, the slope of the thread increases, and the increase in the slope makes the thread more susceptible to the influence of the axial force and loosens, thereby affecting the self-locking property, but the increase in the slope reduces the friction of the thread and increases the transmission efficiency. Based on this, in order to make the transmission effect of the transmission screw 100 better, in some possible embodiments, with reference to Figure 6 , the tooth profile angle α of the external thread 101 is 29.5°-30.5°. For example, the tooth profile angle α of the external thread 101 can be 29.5°, 30°, or 30.5°, etc.

[0062] By limiting the tooth profile angle α of the transmission screw 100 to be within a reasonable range, the transmission screw 100 can ensure its self-locking property while also making the friction during transmission not too large, thereby making the transmission screw 100 have a high transmission efficiency.

[0063] Preferably, the tooth profile angle α of the external thread 101 can be 30°, which can ensure that the external thread 101 has better stability and accuracy during transmission.

[0064] With reference to Figure 6In some possible implementation manners, the crest width W1 of the external thread is 0.15 mm to 0.19 mm. Optionally, the crest width W1 of the external thread can be 0.15 mm to 0.18 mm, 0.15 mm to 0.17 mm, 0.16 mm to 0.18 mm, 0.16 mm to 0.19 mm, or 0.16 mm to 0.19 mm, etc. For example, the crest width W1 of the external thread can be 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, or 0.19 mm, etc.

[0065] In some possible implementation manners, the root width W2 of the external thread is 0.22 mm to 0.26 mm. Optionally, the root width W2 of the external thread can be 0.22 mm to 0.24 mm, 0.23 mm to 0.26 mm, 0.23 mm to 0.25 mm, or 0.24 mm to 0.26 mm, etc. For example, the root width W2 of the external thread can be 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, or 0.26 mm, etc.

[0066] By limiting the thread width of the external thread 101 within a reasonable range, a larger axial gap between the external thread 101 and the internal thread 203a can be ensured, so that the external thread 101 of the transmission screw 100 can smoothly pass through the internal thread 203a of the transmission nut 203 during assembly, thereby ensuring the passability of the transmission screw 100.

[0067] Preferably, the crest width W1 of the external thread can be 0.17 mm, and the root width W2 of the external thread can be 0.24 mm, so that when the external thread 101 cooperates with the internal thread 203a, a suitable axial gap therebetween can be ensured, and at the same time, the transmission screw 100 can have better transmission performance.

[0068] Referring to Figure 7 In some possible implementation manners, the external thread 101 is configured to be connected in cooperation with the internal thread 203a of the transmission nut 203, the single-side radial backlash L1 of the external thread 101 and the internal thread 203a is 0.0125 mm to 0.0225 mm, and / or the single-side axial backlash L2 of the external thread 101 and the internal thread 203a is 0.023 mm to 0.026 mm.

[0069] It can be understood that when the transmission screw 100 and the transmission nut 203 are in transmission connection, the external thread 101 of the transmission screw 100 is connected in cooperation with the internal thread 203a of the transmission nut 203, and in order to realize transmission movement, a cooperation gap exists between the two cooperating threads, which can include two gaps in the radial and axial directions.

[0070] The radial back clearance L1 refers to the fitting clearance between the outer thread 101 and the inner thread 203a of the transmission nut 203 in the radial direction of the transmission screw 100 (a direction perpendicular to the first direction X).

[0071] The axial back clearance L2 refers to the fitting clearance between the outer thread 101 and the inner thread 203a of the transmission nut 203 in the axial direction of the transmission screw 100 (a direction parallel to the first direction X).

[0072] By reasonably controlling the radial back clearance and the axial back clearance between the outer thread 101 of the transmission screw 100 and the inner thread 203a of the transmission nut 203, it is possible to avoid excessive transmission clearance, which is conducive to ensuring smooth transmission movement of the two, enabling the lens 202 in the camera module 200 to move more accurately and stably, with higher precision, and improving the smoothness of the zooming process of the lens 202 in the camera module 200, thereby making the zooming effect of the camera module 200 better. In addition, it can also ensure that the transmission screw 100 and the transmission nut 203 remain stable during transmission operation, reduce vibration caused by friction, and thus improve the stability of the optical performance of the entire camera module 200.

[0073] If the back clearance between the outer thread 101 of the transmission screw 100 and the inner thread 203a of the transmission nut 203 is too small, it will increase the friction between the transmission screw 100 and the transmission nut 203, thereby affecting the stability and efficiency of the transmission. If the back clearance between the outer thread 101 of the transmission screw 100 and the inner thread 203a of the transmission nut 203 is too large, it will not only affect the reliability of the transmission connection, but also affect the stability of the operation, and cause the transmission precision to decrease.

[0074] In one example, the single-side radial back clearance L1 of the outer thread 101 and the inner thread 203a is 0.0125mm-0.0225mm. For example, the single-side radial back clearance L1 of the outer thread 101 and the inner thread 203a can be 0.0125mm, 0.015mm, 0.02mm or 0.0225mm, etc.

[0075] In another example, the single-side axial back clearance L2 of the outer thread 101 and the inner thread 203a is 0.023mm-0.026mm. For example, the single-side axial back clearance L2 of the outer thread 101 and the inner thread 203a can be 0.023mm, 0.024mm, 0.025mm or 0.026mm, etc.

[0076] In another example, the external thread 101 and the internal thread 203a satisfy the following conditions simultaneously: the single-side radial backlash L1 of the external thread 101 and the internal thread 203a is 0.0125mm-0.0225mm, and the single-side axial backlash L2 of the external thread 101 and the internal thread 203a is 0.023mm-0.026mm.

[0077] Referring to Figures 1 to 2 and Figure 8 In some possible implementations, in the camera module 200, the number of the transmission screw rods 100 is multiple, and the starting point 103 of the external thread 101 of each transmission screw rod 100 has the same coordinate value relative to the coordinate point 10c of the transmission screw rod 100 where the transmission screw rod 100 is located.

[0078] By limiting the starting point 103 of the external thread 101 of each transmission screw rod 100 to have the same coordinate value relative to the coordinate point 10c of the transmission screw rod 100 where the transmission screw rod 100 is located, that is, the starting position of the external thread 101 of each transmission screw rod 100 needs to be consistent during the machining process, which has an important influence on the overall quality and performance of the external thread 101.

[0079] During the machining of the external thread 101 of the transmission screw rod 100, the cutter needs to cut according to the predetermined path and parameters, so that the starting position of the external thread 101 of each transmission screw rod 100 is consistent, which can ensure the machining quality and performance of the external thread 101, thereby ensuring the axial position accuracy of the assembled transmission screw rod 100, and ensuring the rotation accuracy and consistency of the multiple transmission screw rods 100 during simultaneous driving, thereby ensuring the accuracy of the movement of the lens 202.

[0080] For example, the number of the transmission screw rods 100 can be two, and the two transmission screw rods 100 can be arranged on the two sides of the lens 202, and the two driving members 201 drive the transmission screw rods 100 to rotate respectively to drive the transmission nut 203 to move linearly, thereby driving the movement of the lens body 202a.

[0081] The application further discloses an electronic device 300 comprising a shell 301 and the camera module 200 in the above embodiments, and the camera module 200 is arranged on the shell 301. The electronic device 300 can include but is not limited to a mobile phone, a tablet computer, a notebook computer, a smart watch, a vehicle-mounted device, a drone, a monitor, etc. Please refer to Figure 9 Taking the electronic device 300 as a mobile phone as an example, the camera module 200 can be arranged on the shell 301.

[0082] It can be understood that the electronic device 300 with the camera module 200 has all the technical effects of the transmission screw 100. That is, the transmission screw 100 in the camera module 200 of the electronic device 300 can have certain self-locking while improving the transmission efficiency and transmission accuracy, so that the performance of the automatic focusing or optical anti-shake of the camera module 200 is better, thereby facilitating the improvement of the performance of the electronic device 300. Since the above technical effects have been described in detail in the embodiments of the transmission screw 100, they will not be described here.

[0083] The transmission screw, the camera module and the electronic device disclosed in the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above embodiment description is only used to help understand the transmission screw, the camera module and the electronic device and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A transmission screw (100), characterized in that, The transmission screw (100) is applied to the camera module (200), which includes a drive unit (201); The transmission screw (100) includes a first end (10a) and a second end (10b) disposed opposite to each other along a first direction (X). The outer peripheral surface of the first end (10a) is provided with a helically disposed external thread (101). The first end (10a) is configured to be connected to the drive member (201). The lead P of the external thread (101) is 0.4mm to 0.8mm, and the tooth height H of the external thread (101) is 0.1mm to 0.5mm.

2. The transmission screw (100) according to claim 1, characterized in that, The external thread (101) has a trapezoidal tooth profile.

3. The transmission screw (100) according to claim 2, characterized in that, The tooth angle α of the external thread (101) is 29.5° to 30.5°.

4. The transmission screw (100) according to claim 1, characterized in that, The helix angle of the external thread (101) The range is 3.27° to 9.27°.

5. The transmission screw (100) according to claim 1, characterized in that, The external thread (101) is configured to engage with the internal thread (203a) of the transmission nut (203), wherein the radial back clearance L1 between the external thread (101) and the internal thread (203a) is 0.0125 mm to 0.0225 mm, and / or the axial back clearance L2 between the external thread (101) and the internal thread (203a) is 0.023 mm to 0.026 mm.

6. The transmission screw (100) according to claim 1, characterized in that, The tooth tip width W1 of the external thread is 0.15mm to 0.19mm, and / or the tooth root width W2 of the external thread is 0.22mm to 0.26mm.

7. The transmission screw (100) according to any one of claims 1-6, characterized in that, The first end (10a) is provided with a slot (102) extending toward the second end (10b), and the slot (102) passes through the first end (10a) radially, and the drive member (201) is connected to the slot (102).

8. A camera module (200), characterized in that, The device includes a lens (202), a drive member (201), and a transmission screw (100) as described in any one of claims 1-7. The drive member (201) is threadedly connected to the transmission screw (100), and the lens (202) is drively connected to the transmission screw (100). The transmission screw (100) moves under the driving action of the drive member (201) to drive the lens (202) to move.

9. The camera module (200) according to claim 8, characterized in that, There are multiple transmission screws (100). The center of the first end (10a) of each transmission screw (100) is taken as the coordinate point (10c). The starting point (103) of the external thread (101) of each transmission screw (100) has the same coordinate value relative to the coordinate point (10c) of the transmission screw (100) to which it is located.

10. An electronic device (300), characterized in that, It includes a housing (301) and a camera module (200) as described in claim 9, wherein the camera module (200) is disposed in the housing (301).

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