Voice coil motor, zoom lens and photographic equipment

Abstract

The application discloses a voice coil motor, a zoom lens and a photographic equipment. The voice coil motor comprises a shell, a magnetic structure, a mover structure and a driving structure. The magnetic structure is arranged on the shell and comprises an annular magnetic yoke body. The mover structure comprises a plurality of mover coils. The plurality of mover coils are movably sleeved on the magnetic yoke segments of the annular magnetic yoke body. The driving structure comprises a plurality of driving chips. The plurality of driving chips are electrically connected to the plurality of mover coils respectively. The plurality of driving chips are used for energizing the plurality of mover coils respectively, so that the power supply pressure of a single driving chip is reduced, greater electromagnetic driving force can be obtained as a whole to cope with greater load demand, the application range of the voice coil motor is widened, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of photographic equipment technology, and in particular to a voice coil motor, a zoom lens, and a photographic device. Background Technology

[0002] A voice coil motor is a device that converts electrical energy into mechanical energy and achieves linear motion and limited swing angle. A voice coil motor generally includes a coil and a yoke. It generates regular motion by utilizing the interaction between the magnetic poles of the magnetic field generated by the magnetic field from the yoke and the magnetic field generated by the energized coil. In existing voice coil motor structures, a single coil is generally used to carry force. However, due to the limitation of the power supply capacity of the chip, the power carrying capacity of a single coil is limited and cannot cope with large load demands. To solve this problem, the art usually uses a larger specification chip for power supply. However, a larger specification chip means a significant increase in cost. Summary of the Invention

[0003] The main objective of this invention is to propose a voice coil motor, a zoom lens, and a photographic device, aiming to solve the problem of significantly increased costs associated with the use of large-scale chips to drive the movement of a single coil in existing voice coil motors.

[0004] To achieve the above objectives, the voice coil motor proposed in this invention includes:

[0005] chassis;

[0006] A magnetic structure is disposed in the housing, the magnetic structure including an annular magnetic yoke;

[0007] The mover structure includes multiple mover coils, all of which are movably sleeved on the yoke segment of the annular magnetic yoke; and...

[0008] The driving structure includes multiple driving chips, each of which is electrically connected to a plurality of moving coils.

[0009] Optionally, multiple moving coils are arranged in parallel, and the moving structure further includes a moving carrier that connects to the multiple moving coils.

[0010] Optionally, the mobile carrier includes a carrier plate, the carrier plate includes a plate body, the plate body has a mounting surface, and a mounting protrusion extends from the center of the mounting surface;

[0011] The plurality of said moving coils includes two first moving coils, which are sandwiched between two opposite end faces of the mounting protrusion.

[0012] Optionally, the peripheral surfaces of both first moving coils abut against the mounting surface of the plate body.

[0013] Optionally, the two first moving coils are bonded to the plate body and / or the mounting protrusion.

[0014] Optionally, the mover structure further includes multiple moving carriers, each of which is connected to a plurality of mover coils.

[0015] Optionally, the annular magnetic yoke comprises:

[0016] The curved magnetic yoke body includes two straight magnetic yoke segments and an arc-shaped magnetic yoke segment. The two straight magnetic yoke segments are spaced apart relative to each other along their width direction, and the arc-shaped magnetic yoke segment connects one opposite end of the two straight magnetic yoke segments; and...

[0017] The magnetic yoke cover is detachably connected to the other end of the two straight magnetic yoke segments.

[0018] Optionally, a mating groove is formed on the magnetic yoke cover, and a positioning protrusion is formed on the straight magnetic yoke segment relative to the mating groove. When the magnetic yoke cover is connected to two straight magnetic yoke segments, the positioning protrusion can extend into the mating groove accordingly.

[0019] To achieve the above objectives, the zoom lens proposed in this invention includes the aforementioned voice coil motor;

[0020] The voice coil motor includes:

[0021] chassis;

[0022] A magnetic structure, disposed in the housing, the magnetic structure comprising a ring-shaped magnetic yoke; and...

[0023] The moving element structure includes multiple moving element coils, all of which are movably sleeved on the yoke segment of the annular magnetic yoke.

[0024] To achieve the above objectives, the photographic device proposed in this invention includes the aforementioned zoom lens.

[0025] In the technical solution provided by this invention, multiple moving coils are used to replace the traditional single coil structure, and multiple driving chips are used to individually energize the multiple moving coils, which reduces the power supply pressure of a single driving chip and can obtain a greater electromagnetic driving force as a whole to cope with larger load requirements, thus broadening the application range of the voice coil motor. At the same time, under the premise of the same overall driving energy, the total cost of multiple smaller-sized driving chips is less than that of a single larger-sized driving chip, thereby reducing production costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the voice coil motor (excluding the housing) provided by the present invention;

[0028] Figure 2 for Figure 1 A side view of the voice coil motor in the diagram;

[0029] Figure 3 for Figure 1 A front view schematic diagram of the voice coil motor in China;

[0030] Figure 4 for Figure 1 A three-dimensional structural diagram of the mover structure (including the first mover coil);

[0031] Figure 5 for Figure 4 A front view schematic diagram of the moving part structure.

[0032] Explanation of icon numbers:

[0033] label name label name 100 voice coil motor 12 magnet 1 magnetic structure 2 Motor structure 11 Ring-shaped magnetic yoke 21 Moving coil 111 Curved magnetic yoke body 211 First moving coil 1111 Straight yoke segment 22 mobile carrier 1112 Arc-shaped magnetic yoke segment 221 carrier board 1113 Positioning projection 222 Board body 112 Magnetic yoke cover 222a Mounting surface 1121 Matching groove 223 Mounting protrusion

[0034] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] A voice coil motor is a device that converts electrical energy into mechanical energy and achieves linear motion and limited swing angle. A voice coil motor generally includes a coil and a yoke. It generates regular motion by utilizing the interaction between the magnetic poles of the magnetic field generated by the magnetic field from the yoke and the magnetic field generated by the energized coil. In existing voice coil motor structures, a single coil is generally used to carry force. However, due to the limitation of the power supply capacity of the chip, the power carrying capacity of a single coil is limited and cannot cope with large load demands. To solve this problem, the art usually uses a larger specification chip for power supply. However, a larger specification chip means a significant increase in cost.

[0039] In view of this, the present invention proposes a voice coil motor, a zoom lens, and a photographic device, aiming to solve the problem of significantly increased cost associated with the use of large-scale chips to drive the movement of a single coil in existing voice coil motors. Figures 1 to 5 This is a schematic diagram of a voice coil motor according to an embodiment of the present invention.

[0040] Please see Figures 1 to 5 The voice coil motor 100 includes a housing, a magnetic structure 1, a mover structure 2, and a drive structure. The magnetic structure 1 is disposed in the housing and includes an annular magnetic yoke 11. The mover structure 2 includes a plurality of mover coils 21, which are movably sleeved on the magnetic yoke segment of the annular magnetic yoke 11. The drive structure includes a plurality of drive chips, which are electrically connected to the plurality of mover coils 21 respectively.

[0041] In the technical solution provided by the present invention, multiple moving coils 21 are used to replace the traditional single coil structure, and multiple driving chips are used to energize each of the multiple moving coils 21 individually. This reduces the power supply pressure on a single driving chip and also obtains a greater electromagnetic driving force as a whole to cope with larger load requirements, thus broadening the application range of the voice coil motor 100. At the same time, under the premise of the same overall driving capability, the total cost of multiple smaller-sized driving chips is less than that of a single larger-sized driving chip, thereby reducing production costs.

[0042] Furthermore, in this embodiment, multiple moving coils 21 are arranged in parallel, and the moving structure 2 further includes a moving carrier 22, which is connected to multiple moving coils 21. The moving carrier 22 can serve as a carrier for various moving devices. Specifically, the moving carrier 22 can be a moving frame on a zoom lens, with a zoom lens mounted on the frame. The moving frame can move along the extension direction of the magnetic yoke segment to achieve zooming. In this embodiment, by connecting the moving carrier 22 to multiple moving coils 21, the multiple moving coils 21 move under the magnetic field of multiple magnets 12 after being energized, thereby driving the moving carrier 22 to move, thus achieving zooming of the zoom lens.

[0043] In another embodiment, the plurality of moving coils 21 are arranged in a close-wound configuration, and the moving structure 2 further includes a moving carrier 22, which is connected to the plurality of moving coils 21. By tightly winding the plurality of moving coils 21 in the same area, the de-energization of any moving coil 21 will not change the force-bearing point of the moving carrier 22, thereby ensuring the driving stability of the moving carrier 22 and avoiding vibration.

[0044] The connection between the mobile carrier 22 and the plurality of moving coils 21 can take many forms; for details, please refer to [link to relevant documentation]. Figures 3 to 5 In this embodiment, the mobile carrier 22 includes a carrier plate 221, which includes a plate body 222. The plate body 222 has a mounting surface 222a, and a mounting protrusion 223 extends from the center of the mounting surface 222a. The plurality of moving coils 21 include two first moving coils 211, which are sandwiched between two opposite end faces of the mounting protrusion 223. The mounting protrusion 223 provides a mounting base for two first moving coils 211, maximizing the utilization of the mounting protrusion 223. This reduces the overall volume and complexity of the plate body 222, making it easier to manufacture.

[0045] Further, please refer to Figure 2 and Figure 5 In this embodiment, the peripheral surfaces of both first moving coils 211 abut against the mounting surface 222a of the plate body 222. The mounting surface 222a of the plate body 222 serves to limit and constrain the first moving coils 211, preventing them from shifting or misaligning.

[0046] In order to prevent the first moving coil 211 from being detached from the carrier plate 221 under force, in this embodiment, the two first moving coils 211 are bonded to the plate body 222 to ensure that the first moving coil 211 is firmly bonded to the plate body 222.

[0047] In another embodiment, the two first moving coils 211 are bonded to the mounting protrusion 223, which can ensure that the first moving coils 211 are firmly bonded to the mounting protrusion 223;

[0048] It should be noted that the two parallel technical features mentioned above, "two first moving coils 211 are bonded and installed to the plate body 222" and "two first moving coils 211 are bonded and installed to the mounting protrusion 223", can be set individually or simultaneously. Obviously, setting them simultaneously is better, as it can ensure a stable connection between the first moving coils 211 and the carrier plate 221.

[0049] In this embodiment, the moving element structure 2 further includes multiple moving carriers 22, each of which is connected to a plurality of moving element coils 21. In this embodiment, the multiple moving carriers 22 are connected to the plurality of moving element coils 21, enabling the multiple moving carriers 22 to move simultaneously or separately via the multiple moving element coils 21, thus diversifying the driving methods. Specifically, when the moving carrier 22 is used as a moving frame on a zoom lens, the moving frame is equipped with zoom lenses. The multiple moving element coils 21 respectively drive the multiple zoom lenses to move, thereby achieving rapid zooming. Simultaneously, the magnetic structure 1 is fully utilized, which is beneficial for the miniaturization of the voice coil motor 100.

[0050] Since the annular magnetic yoke 11 needs to be arranged in a closed loop to provide a large magnetic field, and there are only two ways to fit the moving coil 21 onto the yoke segment, one way is to directly wind the moving coil 21 onto the yoke segment during the winding process; the other way is to arrange the annular magnetic yoke 11 in a split configuration, and then close the annular magnetic yoke 11 after the moving coil 21 is fitted onto the yoke segment through the split opening of the annular magnetic yoke 11. Each of these two methods has its advantages and disadvantages; for details, please refer to [link to relevant documentation]. Figure 3In this embodiment, the annular magnetic yoke 11 includes a curved magnetic yoke body 111 and a magnetic yoke cover 112. The curved magnetic yoke body 111 includes two straight magnetic yoke segments 1111 and an arc-shaped magnetic yoke segment 1112. The two straight magnetic yoke segments 1111 are arranged at intervals relative to each other along their width direction. The arc-shaped magnetic yoke segment 1112 connects one end of the two straight magnetic yoke segments 1111 to the other end. The magnetic yoke cover 112 is detachably connected to the other end of the two straight magnetic yoke segments 1111. In this embodiment, before closing the annular magnetic yoke 11, the wound moving coil 21 can be first fitted onto the straight magnetic yoke segment 1111, and then the magnetic yoke cover 112 can be connected to the two straight magnetic yoke segments 1111 to complete the closure of the annular magnetic yoke 11. Compared with the method of directly winding the wire on the magnetic yoke segment, the implementation process of this embodiment is more convenient and the production efficiency is greatly improved. It can be understood that the magnetic yoke segment includes two straight magnetic yoke segments 1111, and the extension direction of the straight magnetic yoke segment 1111 is the movement direction of the moving coil 21.

[0051] It is understood that multiple moving coils 21 are sleeved on one of the straight magnetic yoke segments 1111; the magnetic structure 1 also includes a magnet 12, which is disposed on the other straight magnetic yoke segment 1111. Specifically, the magnet 12 is disposed on the opposite end faces of the two straight magnetic yoke segments 1111. This arrangement avoids placing the magnet 12 on the outside of the annular magnetic yoke 11, thus avoiding excessive space occupation and reducing the overall volume of the voice coil motor 100.

[0052] Furthermore, there are several ways in which the magnetic yoke cover 112 can be detachably connected to the two straight magnetic yoke segments 1111; please refer to [link / reference]. Figure 1 and Figure 2 In this embodiment, a mating groove 1121 is formed on the yoke cover 112, and a positioning protrusion 1113 is formed on the straight yoke segment 1111 opposite to the mating groove 1121. When the yoke cover 112 is connected to two straight yoke segments 1111, the positioning protrusion 1113 can extend into the mating groove 1121 accordingly. Under the action of the magnet 12, the curved yoke body 111 becomes magnetic, and the yoke cover 112 can be magnetically attracted to the two straight yoke segments 1111 along the magnetic pole orientation. Then, through the adaptive connection between the positioning protrusion 1113 and the mating groove 1121, the movement of the yoke cover 112 along the radial direction of the straight yoke segment 1111 can be restricted, ensuring a stable connection between the yoke cover 112 and the curved yoke body 111.

[0053] The present invention also provides a zoom lens, including the voice coil motor 100 as described above. Since this zoom lens employs all the technical solutions of all embodiments of the above-described voice coil motor 100, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0054] The present invention also provides a photographic device, including the zoom lens described above. Since this photographic device employs all the technical solutions of all embodiments of the above-described zoom lens, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0055] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A voice coil motor, characterized in that, include: chassis; A magnetic structure is disposed in the housing, the magnetic structure including an annular magnetic yoke; The moving element structure includes multiple moving element coils, all of which are movably sleeved on the yoke segment of the annular magnetic yoke. as well as, The driving structure includes multiple driving chips, each of which is electrically connected to a multiple moving coil. Multiple moving coils are arranged in parallel, and the moving structure also includes multiple moving carriers, each of which is respectively connected to multiple moving coils; The mobile carrier includes a carrier plate, the carrier plate includes a plate body, the plate body has a mounting surface, and a mounting protrusion extends from the center of the mounting surface; The plurality of said moving coils includes two first moving coils, which are sandwiched between two opposite end faces of the mounting protrusion; The peripheral surfaces of both first moving coils abut against the mounting surface of the plate body; The peripheral surfaces of both first moving coils abut against the mounting surface of the plate body; The two first moving coils are bonded and installed to the plate body and the mounting protrusion.

2. The voice coil motor as described in claim 1, characterized in that, The annular magnetic yoke includes: The curved magnetic yoke body includes two straight magnetic yoke segments and an arc-shaped magnetic yoke segment. The two straight magnetic yoke segments are spaced apart relative to each other along their width direction, and the arc-shaped magnetic yoke segment connects one opposite end of the two straight magnetic yoke segments; and... The magnetic yoke cover is detachably connected to the other end of the two straight magnetic yoke segments.

3. The voice coil motor as described in claim 2, characterized in that, The magnetic yoke cover has a mating groove, and the straight magnetic yoke segment has a positioning protrusion relative to the mating groove. When the magnetic yoke cover is connected to two straight magnetic yoke segments, the positioning protrusion can extend into the mating groove accordingly.

4. A zoom lens, characterized in that, Includes the voice coil motor as described in any one of claims 1 to 3.

5. A photographic device, characterized in that, Including the zoom lens as described in claim 4.

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