Magnet-driven zoom lens barrel and zoom lens

Abstract

The invention discloses a magnet-driven zoom lens barrel and zoom lens, and relates to the technical field of optical devices. The invention comprises: a fixed barrel, a rotating barrel is coaxially sleeved on the outer side of the fixed barrel, and the rotating barrel is rotatably connected to the fixed barrel along the axis direction of the fixed barrel; a shielding assembly is provided on the fixed barrel, and a coil assembly for electrically connecting to a power supply is sleeved on the shielding assembly; a driving magnet for adapting to the coil assembly is provided on the rotating barrel, and the driving magnet is used to provide a magnetic field to the coil assembly; the angle between the coil in the coil assembly on the side of the shielding assembly close to the driving magnet and the axis of the fixed barrel is less than or equal to a preset angle; when the coil assembly is electrically connected to the power supply, the driving magnet rotates in a direction perpendicular to the axis of the fixed barrel, and drives the rotating barrel to rotate. The invention reduces the possibility of return difference during multi-stage transmission, improves the speed and stability of zooming, increases the precision of the zoom lens, and meets the requirements of high-precision lenses.

Description

Technical Field

[0001] The invention relates to the technical field of optical devices, and in particular to a magnet-driven zoom lens barrel and a zoom lens. Background Art

[0002] A zoom lens is a lens that can change its focal length within a certain range, thereby obtaining different widths of field angles, different sizes of images, and different ranges of scenery. A zoom lens can change the shooting range by changing the focal length without changing the shooting distance, so it is very helpful for picture composition.

[0003] During the zooming process of a zoom lens, stepper motors are widely used in the automatic zooming and focusing of optical zoom lenses. When driving a zoom lens, a stepper motor usually drives the gears outside the zoom lens to rotate the lens barrel, and then converts the rotation of the lens barrel into the linear motion of the focusing lens group or the zoom lens group through the spiral groove on the lens barrel, thus realizing the zooming function of the zoom lens.

[0004] However, the zoom lens composed of a stepper motor and a gear set needs to go through multiple layers of motion relationship conversion, which reduces the transmission efficiency between the drive component and the zoom component in the zoom lens, reduces the transmission accuracy, and is accompanied by a return difference during the zoom process, making it difficult to meet the requirements of high-precision lenses. Summary of the invention

[0005] The present invention will solve the existing technical problems and provide a magnet-driven zoom lens barrel and zoom lens, which reduces the possibility of return difference during multi-stage transmission, improves the speed and stability of zooming, increases the accuracy of the zoom lens, and meets the requirements of high-precision lenses.

[0006] The technical solution provided by the present invention is as follows:

[0007] A magnet-driven zoom lens barrel comprises: a fixed barrel, a rotating barrel coaxially sleeved on the outer side of the fixed barrel, the rotating barrel rotatably connected to the fixed barrel along the axial direction of the fixed barrel; a shielding assembly is provided on the fixed barrel, the shielding assembly is sleeved with a coil assembly for electrically connecting to a power supply; a driving magnet for matching with the coil assembly is provided on the rotating barrel, the driving magnet is used to provide a magnetic field to the coil assembly; the angle between the coil in the coil assembly on the side of the shielding assembly close to the driving magnet and the axis of the fixed barrel is less than or equal to a preset angle; when the coil assembly is electrically connected to a power supply, the driving magnet rotates in a direction perpendicular to the axial direction of the fixed barrel and drives the rotating barrel to rotate.

[0008] In the present technical solution, through the setting of the shielding component and the driving magnet, the driving magnet can directly drive the rotating cylinder to rotate, and then drive the zoom lens to zoom, reducing the possibility of return difference during multi-stage transmission, improving the speed and stability of zooming, increasing the accuracy of the zoom lens, and meeting the requirements of high-precision lenses.

[0009] Preferably, the driving magnet is provided in plurality, and the plurality of driving magnets are distributed on the rotating cylinder along the axial direction of the rotating cylinder.

[0010] In the technical solution, by setting up multiple driving magnets, the Ampere force on the coil assembly is increased, and the reaction force on the driving magnet is also increased, that is, the rotational force when the rotating cylinder rotates, thereby increasing the reliability of the rotating cylinder when rotating.

[0011] Preferably, the shielding assembly includes a plurality of shielding plates, and the plurality of shielding plates are distributed on the fixed cylinder along the axial direction of the fixed cylinder; the coil assembly includes driving coils respectively arranged on the plurality of shielding plates.

[0012] In this technical solution, by splitting the shielding assembly into multiple shielding plates, the torque on the rotating barrel remains basically unchanged, but the mass and volume of the zoom lens barrel are reduced to a certain extent, which facilitates the processing and manufacturing of the zoom lens barrel.

[0013] Preferably, the driving coil is detachably connected to the shielding plate.

[0014] In the technical solution, the detachably connected driving coil is provided, which facilitates the installation and removal of the driving coil on the shielding plate, thereby increasing the interchangeability of the driving coil.

[0015] Preferably, one end of the shielding plate is further provided with a buckle for clamping the driving coil.

[0016] In the technical solution, the buckle is set to increase the constraint between the shielding plate and the coil, reduce the possibility of the coil detaching from the shielding upper plate when the user moves the fixing tube, and simplify the assembly of the coil and the shielding plate.

[0017] Preferably, the distance between two adjacent driving magnets is smaller than the width of the driving coil; and / or the distance between two adjacent driving coils is smaller than the width between the driving magnets.

[0018] In this technical solution, the coil in the magnetic field can continue to provide Ampere force to the driving coil, and then the driving magnet can continue to rotate under the reaction force of the Ampere force, reducing the possibility of the rotating drum stopping and increasing the reliability of the rotating drum rotation.

[0019] Preferably, the normal line of the driving magnet is parallel or perpendicular to the axis of the fixing cylinder.

[0020] In the technical solution, by changing the installation method of the driving magnet on the fixed barrel, it is applicable to various zoom lenses, thereby increasing the application range of the zoom lens barrel.

[0021] Preferably, a detection ring is provided on the rotating cylinder, and the magnet-driven zoom lens barrel further comprises an angle sensor fixedly arranged to detect the angle of the rotating cylinder.

[0022] In the technical solution, the quantitative rotation of the rotating drum is achieved by setting the angle sensor, thereby increasing the rotation accuracy of the rotating drum.

[0023] Preferably, a metal connecting cylinder is further provided at one end of the rotating cylinder close to the shielding assembly, and the driving magnet is arranged in the metal connecting cylinder.

[0024] In the technical solution, by setting the metal connecting cylinder, the magnetic field is only between the metal connecting cylinder and the shielding member, thereby increasing the magnetic field and further increasing the reliability of the rotation of the rotating cylinder.

[0025] Another object of the present invention is to provide a zoom lens having a magnet-driven zoom lens barrel.

[0026] Compared with the prior art, the magnet-driven zoom lens barrel and zoom lens provided by the present invention have the following beneficial effects:

[0027] 1. Through the setting of the shielding component and the driving magnet, the driving magnet can directly drive the rotating cylinder to rotate, and then drive the zoom lens to zoom, reducing the possibility of return difference during multi-stage transmission, improving the speed and stability of zooming, increasing the accuracy of the zoom lens, and meeting the requirements of high-precision lenses.

[0028] 2. By splitting the shielding assembly into multiple shielding plates, the torque on the rotating barrel remains basically unchanged, but the mass and volume of the zoom lens barrel are reduced to a certain extent, which facilitates the processing and assembly of the zoom lens barrel.

[0029] 3. The coil in the magnetic field can continue to provide the Ampere force to the driving coil, and then the driving magnet can continue to rotate under the reaction force of the Ampere force, thereby increasing the magnetic field driving force of the rotating cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The preferred implementation modes will be described below in a clear and understandable manner in conjunction with the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of a magnet-driven zoom lens barrel and zoom lens.

[0031] Figure 1It is a structural schematic diagram of a magnet-driven zoom lens barrel of the present invention;

[0032] Figure 2 It is a structural schematic diagram of another magnet-driven zoom lens barrel of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a zoom lens of the present invention.

[0034] Explanation of the accompanying drawings: 10, fixed cylinder; 11, mounting groove; 12, sliding block; 20, rotating cylinder; 21, spiral groove; 22, detection ring; 23, angle sensor; 30, shielding assembly; 31, shielding plate; 32, buckle; 40, coil assembly; 41, driving coil; 50, driving magnet; 60, metal connecting cylinder. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0036] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0037] Embodiment 1: Figure 1 As shown, a magnet-driven zoom lens barrel comprises:

[0038] The fixed barrel 10 is cylindrical and is provided with a sliding group (not shown in the figure). A focusing lens group and / or a zoom lens group for zooming the zoom lens can be installed in the sliding group. A mounting groove 11 can be opened on the fixed barrel 10. The mounting groove 11 can be opened on the fixed barrel 10 along an axial direction parallel to the fixed barrel 10. A sliding block 12 for sliding in the mounting groove 11 is provided on the sliding group. The sliding block 12 can slide in the mounting groove 11, thereby realizing the zooming effect of the zoom lens.

[0039] A rotating cylinder 20 is coaxially sleeved on the outer side of the fixed cylinder 10. The rotating cylinder 20 can be rotatably connected to the fixed cylinder 10 along the axial direction of the fixed cylinder 10. Specifically, the inner wall radius of the rotating cylinder 20 is close to the outer wall radius of the fixed cylinder 10, and the rotating cylinder 20 can be sleeved on the outer side of the fixed cylinder 10; a spiral groove 21 is also opened on the outer side of the rotating cylinder 20, and the outer end of the sliding block 12 can be set in the spiral groove 21 and slide along the opening direction of the spiral groove 21.

[0040] When the rotating cylinder 20 rotates, the sliding block 12 abutting against the spiral groove 21 has a tendency to move upward or downward, and the sliding block 12 can slide upward along the opening direction of the installation groove 11. At the same time, due to the rotation of the rotating cylinder 20, the sliding block 12 can also slide in the spiral groove 21, and then drive the sliding group to slide along the axial direction of the fixed cylinder 10. The sliding group can realize the change of the position of the focusing lens group or the zoom lens group, that is, the zoom action of the zoom lens is realized.

[0041] The fixed cylinder 10 is provided with a shielding assembly 30 , and the shielding assembly 30 is sleeved with a coil assembly 40 for being electrically connected to a power source, that is, the coil assembly 40 surrounds the shielding assembly 30 .

[0042] A driving magnet 50 for matching with the coil assembly 40 is provided on the rotating cylinder 20, and the driving magnet 50 is used to provide a magnetic field to the coil assembly 40; since the rotating cylinder 20 is arranged on the outside of the fixed cylinder 10, the driving magnet 50 is also arranged on the outside of the shielding assembly 30, so a magnetic field is formed between the shielding assembly 30 and the driving magnet 50, and there is no magnetic field inside the shielding assembly 30; when the coil assembly 40 is electrically connected to a power supply, current can be formed in the coil assembly 40, and the coil assembly 40 placed in the magnetic field will be subjected to the Ampere force, that is, the outer coil will be subjected to the Ampere force.

[0043] The angle between the coil in the coil assembly 40 on the side of the shielding assembly 30 close to the driving magnet 50 and the axis of the fixed cylinder 10 is less than or equal to the preset angle. In this embodiment, the preset angle is 0 to 10°, and the preset angle can be changed according to the needs of the user; when the preset angle is 0°, the Ampere force on the coil is in the tangential direction of the fixed cylinder 10.

[0044] Preferably, the shielding assembly 30 is annular; when the rotating cylinder 20 is rotating, the driving magnet 50 can always provide magnetism to the driving coil 41 on the shielding assembly 30, the driving coil 41 can always be subjected to the Ampere force, and the driving magnet 50 is then subjected to the reaction force and continues to rotate.

[0045] When the coil assembly 40 is electrically connected to a power source, the driving magnet 50 rotates along an axial direction perpendicular to the fixed cylinder 10 and drives the rotating cylinder 20 to rotate.

[0046] When the coil is electrically connected to the power supply, the coil outside the shielding assembly 30 is subjected to a tangential Ampere force, and at the same time, the driving magnet 50 is also subjected to a reaction force in the opposite direction. Since the shielding assembly 30 is fixedly arranged on the fixed cylinder 10, the driving magnet 50 drives the rotating cylinder 20 to rotate along the axial direction of the fixed cylinder 10.

[0047] In this embodiment, through the setting of the shielding assembly 30 and the driving magnet 50, the driving magnet 50 can directly drive the rotating cylinder 20 to rotate, and then drive the zoom lens to zoom, reducing the possibility of return difference during multi-stage transmission, improving the speed and stability of zooming, and increasing the accuracy of the zoom lens, meeting the requirements of high-precision lenses.

[0048] At the same time, in this embodiment, by providing the driving magnet 50 and the shielding assembly 30, there is no need to provide an extra driving motor and transmission gear, which reduces the volume of the zoom lens to a certain extent and realizes the miniaturization of the zoom lens.

[0049] Preferably, the normal of the driving magnet 50 is parallel or perpendicular to the axis of the fixed cylinder 10; that is, the driving magnet 50 can be vertically set on the fixed cylinder 10, and can also be horizontally set on the fixed cylinder 10; when the total optical length of the zoom lens is longer, the driving magnet 50 can be vertically set on the fixed cylinder 10, the driving magnet 50 can provide a larger magnetic field, and the radius of the zoom lens is smaller; when the total optical length of the zoom lens is shorter, the driving magnet 50 can also be horizontally set on the fixed cylinder 10, but the radius of the zoom lens is larger.

[0050] In this embodiment, by changing the installation method of the driving magnet 50 on the fixed tube 10, it is applicable to various zoom lenses, thereby increasing the application range of the zoom lens barrel.

[0051] Embodiment 2: Figure 1 As shown, a magnet-driven zoom lens barrel is provided. The difference between this embodiment and the first embodiment is that a plurality of driving magnets 50 are provided.

[0052] On the basis of the first embodiment, in this embodiment, a plurality of driving magnets 50 are provided, and the plurality of driving magnets 50 are distributed on the rotating cylinder 20 along the axial direction of the rotating cylinder 20 ; specifically, in this embodiment, at least three driving magnets 50 are provided.

[0053] In this embodiment, by disposing a plurality of driving magnets 50 , the Ampere force on the coil assembly 40 is increased, and the reaction force on the driving magnet 50 , that is, the rotational force when the rotating cylinder 20 rotates, is also increased, thereby increasing the reliability of the rotating cylinder 20 when rotating.

[0054] Preferably, the plurality of driving magnets 50 are evenly distributed around the rotating drum 20 along the axial direction of the rotating drum 20, that is, the angles between two adjacent driving magnets 50 are the same. In this embodiment, by setting the evenly distributed driving magnets 50, the possibility of torque changes on the rotating drum 20 during rotation is reduced, thereby reducing the possibility of sudden speed changes of the rotating drum 20 during rotation, and increasing the reliability of the rotating drum 20 during rotation.

[0055] Embodiment 3: Figure 2 As shown, a magnet-driven zoom lens barrel is shown. The difference between this embodiment and the first embodiment lies in the specific structure of the shielding component 30.

[0056] On the basis of embodiment one, in this embodiment, the shielding assembly 30 includes a plurality of shielding plates 31, and the plurality of shielding plates 31 are distributed on the fixed tube 10 along the axial direction of the fixed tube 10; preferably, the plurality of shielding plates 31 are evenly distributed on the fixed tube 10 along the axial direction of the fixed tube 10, that is, the distance between two adjacent shielding plates 31 is the same.

[0057] The coil assembly 40 includes driving coils 41 disposed on a plurality of shielding plates 31 , respectively.

[0058] In this embodiment, by splitting the shielding assembly 30 into a plurality of shielding plates 31, the torque acting on the rotating barrel 20 remains substantially unchanged, but the mass and volume of the zoom lens barrel are reduced to a certain extent, thereby facilitating the processing and assembly of the zoom lens barrel.

[0059] Preferably, the drive coil 41 is detachably connected to the shielding plate 31, and the drive coil 41 can be directly clamped and sleeved on the shielding plate 31; the provision of the detachably connected drive coil 41 facilitates the loading and unloading of the drive coil 41 on the shielding plate 31, thereby increasing the interchangeability of the drive coil 41.

[0060] One end of the shielding plate 31 is also provided with a buckle 32 for clamping the driving coil 41. Specifically, one end of the driving coil 41 can abut against the shielding plate 31, and the other end of the driving coil 41 can abut against the buckle 32, thereby locking the driving coil 41. In this embodiment, through the provision of the buckle 32, the constraint between the shielding plate 31 and the coil is increased, and the possibility of the coil detaching from the shielding upper plate when the user moves the fixed cylinder 10 is reduced, thereby simplifying the assembly of the coil and the shielding plate.

[0061] Preferably, the distance between two adjacent driving magnets 50 is smaller than the width of the driving coil 41; and / or the distance between two adjacent driving coils 41 is smaller than the width between the driving magnets 50. In the current state, when the driving magnets 50 drive the rotating drum 20 to rotate, no matter in any state, a part of the coil on each driving coil 41 is in the magnetic field, and the coil in the magnetic field can continue to provide the Ampere force to the driving coil 41, and then the driving magnets 50 can also continue to rotate under the reaction force of the Ampere force, thereby increasing the magnetic field driving force of the rotating drum 20.

[0062] Embodiment 4: Figure 2 As shown, a magnet-driven zoom lens barrel is shown. The difference between this embodiment and the first embodiment lies in the arrangement of the detection ring 22 and the angle sensor 23.

[0063] On the basis of the first embodiment, in this embodiment, a detection ring 22 is provided on the rotating cylinder 20, and the magnet-driven zoom lens barrel also includes a fixedly arranged angle sensor 23 for detecting the angle of the rotating cylinder 20; specifically, the detection ring 22 is a magnetic strip with continuously arranged NS poles, and the angle sensor 23 is a GMR sensor.

[0064] In this embodiment, the angle sensor 23 is provided to achieve quantitative rotation of the rotating drum 20 , thereby increasing the rotation accuracy of the rotating drum 20 .

[0065] Preferably, a metal connecting tube 60 is further provided at one end of the rotating tube 20 close to the shielding assembly 30. The metal connecting tube 60 can be set at the uppermost end of the rotating tube 20. Therefore, the rotating tube 20 and the fixed tube 10 can be made of non-metallic materials, which reduces the cost and quality of the zoom lens barrel and facilitates users to carry it. The driving magnet 50 can be set in the metal connecting tube 60. Specifically, the detection ring 22 can be set on the metal connecting tube 60.

[0066] In this embodiment, by providing the metal connecting cylinder 60 , the magnetic field only exists between the metal connecting cylinder 60 and the shielding member, thereby enhancing the magnetic field and further increasing the reliability of the rotation of the rotating cylinder 20 .

[0067] Embodiment 4: Figures 1 to 3 As shown, a zoom lens is provided with a magnet-driven zoom lens barrel described in any of the above embodiments. It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A magnet-driven zoom lens barrel, characterized in that: include: A fixed cylinder, wherein a rotating cylinder is coaxially sleeved on the outer side of the fixed cylinder, and the rotating cylinder is rotatably connected to the fixed cylinder along the axis direction of the fixed cylinder; A sliding group is provided in the fixed tube, and a focusing lens group and / or a zoom lens group for zooming the zoom lens are installed in the sliding group. A mounting groove is provided on the fixed tube, and the mounting groove is provided on the fixed tube in a direction parallel to the axis of the fixed tube. A sliding block for sliding in the mounting groove is provided on the sliding group, and the sliding block is used to slide in the mounting groove. The fixed cylinder is provided with a shielding component, and the shielding component is sleeved with a coil component for being electrically connected to a power source; The rotating cylinder is provided with a driving magnet adapted to the coil assembly, and the driving magnet is used to provide a magnetic field to the coil assembly; The angle between the coil in the coil assembly on the side of the shielding assembly close to the driving magnet and the axis of the fixing cylinder is less than or equal to a preset angle; When the coil assembly is electrically connected to a power source, the driving magnet rotates in a direction perpendicular to the axis of the fixed cylinder and drives the rotating cylinder to rotate; The driving magnets are arranged in a plurality, and the plurality of driving magnets are distributed around the rotating cylinder along the axis direction of the rotating cylinder; The shielding assembly includes a plurality of shielding plates, and the plurality of shielding plates are distributed around the fixing tube along the axial direction of the fixing tube; The coil assembly includes driving coils respectively arranged on a plurality of the shielding plates; The distance between two adjacent driving magnets is smaller than the width of the driving coil; and / or The distance between two adjacent driving coils is smaller than the width between the driving magnets; The normal line of the driving magnet is parallel or perpendicular to the axis of the fixing cylinder.

2. The magnet-driven zoom lens barrel according to claim 1, characterized in that: The driving coil is detachably connected to the shielding plate.

3. The magnet-driven zoom lens barrel according to claim 2, characterized in that: One end of the shielding plate is also provided with a buckle for clamping the driving coil.

4. The magnet-driven zoom lens barrel according to claim 1, characterized in that: The rotating cylinder is provided with a detection ring, and the magnet-driven zoom lens barrel further comprises an angle sensor fixedly arranged to detect the angle of the rotating cylinder.

5. The magnet-driven zoom lens barrel according to any one of claims 1 to 4, characterized in that: A metal connecting cylinder is further provided at one end of the rotating cylinder close to the shielding assembly, and the driving magnet is arranged in the metal connecting cylinder.

6. A zoom lens, characterized in that: The zoom lens is provided with a magnet-driven zoom lens barrel as claimed in any one of claims 1 to 5.

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