TWI504109B - Can move the moving sound of the voice coil motor - Google Patents

Description

Voice coil motor for stable moving parts

The present invention relates to a voice coil motor; and more particularly to a voice coil motor that can stably move a moving member.

In order to perform precise positioning control on the head arm of a lens group or a hard disk, a voice coil motor (VCM) that can stably move the moving parts is usually used to move the head arm of the lens group or the hard disk. The mechanism for stabilizing the voice coil motor of the moving member is mainly to place the coil in a magnetic circuit containing a permanent magnet.

In an optical system, when a current passes through a coil, a magnetic field formed by the permanent magnet generates an interaction force according to Fleming's left-hand rule, so that the socket of the rigid connecting permanent magnet is moved while driving the fixing on the socket. The lens group achieves the purpose of optical zooming and focusing.

Please refer to Figures 1A~1B. Figures 1A~1B are schematic diagrams of conventional voice coil motors. As shown in FIGS. 1A to 1B, the conventional voice coil motor generally includes a movable magnetic path member 10 of a movable magnetic path member (not depicted) and a plurality of guide shafts 12. The movable magnetic circuit component 10 has a plurality of through holes 101, and a plurality of guide shafts 12 fixed to a base (not depicted) are relatively passed through the through holes 101, so that the lens carrier 10 of the movable magnetic circuit component can follow a plurality of The guide shafts 12 are moved up and down in a straight line. If optical zooming is required, after a set of coils of fixed circuit components (not depicted) are required to be powered, the main magnetic field provided by the set of coils of the fixed circuit component and the magnetic sensitive component (not depicted) of the movable magnetic circuit component Under the interaction, the load mounting slide of the movable magnetic circuit component 10 (usually carrying the lens) follows a plurality of The guide shaft 12 is moved up and down in a straight line.

Please refer to the 2A-2B diagram, and the 2A-2B diagram is a schematic diagram of the conventional voice coil motor posture difference. During the above movement, based on the magnetic attraction of the magnetic sensing element to the guiding shaft 112 that has abutted against the perforation, the guiding shaft 12 will be in close proximity to and in contact with the aperture of the perforation 101, and the two guiding metals 12 are respectively One point of contact with the aperture of the perforation 101 (when viewed in a plan view). Regardless of whether the axis of the guide shaft 12 slides within the perforation 101 or the shaft axis slides in a plane, the guide shaft and the wall of the perforation 101 are in line contact from the perspective of the three-dimensional space. However, under the influence of gravity, different directions and angles may cause a certain contact line between the shaft 12 and the perforation 101. In other words, under the absence or limitation of a certain gravity greater than the gravity, the guide shaft 12 is guided under the apertures of the two guiding metals 12 respectively contacting the perforations 101 with a single point (ie, only 2 line contacts). There will be a 360 degree annular contact line between the walls of the perforations 101, causing a relatively large difference in posture when the movable magnetic circuit member 10 slides or stops sliding along the guide shaft 12, resulting in a movable magnetic circuit member. The image taking lens on the 10 has a problem that the image is unclear.

Please refer to Figures 3A-3B, and Figures 3A-3B are schematic diagrams of conventional voice coil motors. As shown in Figures 3A to 3B, the conventional voice coil motor of the Republic of China Patent Publication No. I400861 includes a base 30, a set of guide shafts 401 and 402 fixed to the base 30, and a fixed circuit component 50 (mainly by a coil The movable magnetic circuit member 60 (including the magnetic sensitive element 61 and rigidly connected to the load mounting slide 62). Among them, the movable magnetic circuit component also has two different shaped holes of the perforations 601 and 602 and the apertures of the perforations 601 and 602 are sufficient to be passed through the set of guiding axes 401 and 402, respectively. When the set of guide shafts 401 and 402 are non-metallic, the leakage magnetic field of the magnetic sensitive element 61 and the magnetically permeable metal casing 70 generate a magnetic attraction force.

Briefly, as shown in FIG. 3A, the pair of magnetic sensitive elements 61 have been placed against the perforations 601 and 602. The magnetic attraction of the guide shafts 401 and 402 causes the guide shafts 401 and 402 to contact the apertures of the perforations 601 and 602. In order to solve the problem of relatively large posture difference when the load mounting slide 62 slides or stops sliding, the contact between the guide shafts 401 and 402 and the through holes 601 and 602, one of which is a single contact line C1 (by perforation) The other end of the 601 is in contact with a plurality of contact points, and the other is in contact with the two contact lines C2 and C3, as shown in FIG. 3B. Among them, the contact lines C2 and C3 belong to the main contact line, and when the load mounting slide 62 moves up and down along the guide shaft 402, the contact lines C2 and C3 share the main coasting action. The contact line C1 between the guiding shaft 401 and the through hole 601 can have a large degree of freedom of left and right offset due to the characteristics of the structure of the through hole 601, so as to absorb the partial deviation when the posture difference as shown in FIGS. 2A to 2B occurs. Move, skew.

However, under the influence of the magnetic force, the load mounting slide 62 is along the rotational direction R, and the phenomenon of rotation exists and is unavoidable, resulting in the contact lines C1, C2 between the guide shafts 401 and 402 and the through holes 601 and 602. With C3, there is a possibility of deflection if there is not enough external force. In addition, the inner wall of the perforations 601 and 602 is affected by the arc surface, and during the process of the load mounting slide 62 moving up and down, interference occurs at both ends, causing the load mounting slide 62 to be severely tilted and unstable or not. Reproducibility. At this time, each contact point between the guide shafts 401 and 402 and the through holes 601 and 602 becomes gradually shifted, causing the contact lines C1, C2 and C3 to spiral, instead of being a complete straight line in the original design. .

In other words, whether the two or three points between the guide shafts 401 and 402 and the through holes 601 and 602 are not effectively solved, the movable magnetic circuit member 10 slides or stops sliding along the guide shaft 12, which is relatively large. The posture is poor, causing the image pickup lens on the movable magnetic circuit member 10 to have a problem that the image is unclear.

Traditionally, only two lines are in contact between the two guiding metals and the perforations, resulting in a 360-degree annular contact line between them, which causes a large difference in posture when the load mounting slide slides or stops sliding. And there are problems with unclear images. Or, the sliding of the sliding seat is affected by the magnetic force to cause rotation, resulting in a design of three lines of contact between the two guiding metals and the perforations, and the contact surface of the curved surface may still be the upper and lower triangular triangles. There is still a large difference in posture when the contact mounting slide slides or stops sliding, and there is still a problem that the image is unclear.

Accordingly, it is a primary object of the present invention to provide a voice coil motor that can stably move a moving member based mainly on the magnetic attraction of the magnetic sensing element to the set of guiding shafts, the set of guiding axes and the plane of the abutting structure ( For example, the open hole has two points of contact with a single point, and the difference between the two groups is the master-slave difference, so that the posture or the tilt angle stability of the moving member is improved when moving.

Based on the above object, the voice coil motor of the present invention can stably move a moving coil motor comprising a base, a set of guiding shafts fixed on the base, fixed circuit components (mainly composed of coils), and movable magnetic circuit components (including magnetic sensing components) And the rigid connection has a load mounting slide). Among them, the movable magnetic circuit member has two abutting structures. Based on the magnetic attraction of the magnetic sensing element to the set of guiding axes, the set of guiding axes and the abutting structural hole walls respectively have two points in line contact with a single point.

The advantages and spirit of this creation can be further understood by the following new detailed description and the accompanying drawings.

10‧‧‧Load mounting slide

101‧‧‧Resist structure

12, 401, 402, 801, 802‧‧‧ guidance axes

30‧‧‧Base

50‧‧‧Fixed circuit components

60, 70‧‧‧ movable magnetic circuit components

61‧‧‧Magnetic components

62‧‧‧Load mounting slide

601, 602‧‧ perforation

701, 702‧‧‧ Dependent structure

703‧‧‧Abutment

7031‧‧‧ Short side

7032‧‧‧ long side

705‧‧‧ openings

C1, C2, C3, C4, C5, C6‧‧‧ contact lines

R‧‧‧Rotation direction

Figures 1A to 1B are schematic views of a conventional voice coil motor.

2A-2B is a schematic diagram of a conventional voice coil motor posture difference.

Figures 3A-3B show another schematic diagram of a conventional voice coil motor.

4A-4B are schematic views of the voice coil motor of the movable moving member of the present invention.

Figure 5 is a schematic view of the abutment structure of the present invention.

Fig. 6 is another schematic view of the voice coil motor of the movable movable member of the present invention.

7A-7B are schematic views of the angle between the contact surface and the contact angle of the present invention.

Please refer to FIGS. 4A-4B, and FIGS. 4A-4B are schematic views of the voice coil motor of the present invention for stabilizing the moving member. As shown in FIG. 4A to FIG. 4B, the voice coil motor of the present invention can stably move the moving part including the base 30, a set of guiding shafts 801 and 802 fixed on the base 30, and fixed circuit components (not depicted; mainly composed of coils) The movable magnetic circuit member 70 (including a magnetic sensitive element (not depicted) and rigidly connected with a load mounting slide (not depicted)). Wherein, the opening 705 of the movable magnetic circuit component 70 can be mounted with a load mounting slide.

In order to allow the movable magnetic circuit component 70 to vertically move up and down along the set of guiding shafts 801 and 802, the outer portion of the movable magnetic circuit component 70 has a first abutting structure 701 and a second abutting structure 702, and the first abutting The structure 701 and the second abutment structure 702 have symmetry in positional setting.

Please refer to FIG. 5, which is a schematic view of the abutment structure of the present invention. As shown in FIG. 5, the first abutting structure 701 and the second abutting structure 702 each have at least two elongated structures of the abutting surface 703, and the abutting surface 703 is composed of a long side 7032 and a short side 7031. The plane that is formed. The length of the short side 7031 of the abutting surface 703 is at least the radius of the guiding shafts 801 and 802, and the abutting surface 703 and the guiding shafts 801 and 802 can be in contact relationship. Among them, in order to overcome the conventional inner wall of the perforation The problem, the abutment surface 703 is a plane.

Please refer to FIG. 6. FIG. 6 is another schematic view of the voice coil motor of the movable movable member of the present invention. As shown in FIG. 6, based on the magnetic attraction force of the magnetic sensitive element, the set of guiding shafts 801, 802 abut against the first abutting structure 701 and the second abutting structure 702, and also allows the movable magnetic circuit component In the direction of rotation R, the guiding shafts 801 and 802 are brought into contact with the first abutting structure 701 and the second abutting structure 702. In this contact relationship, there are a plurality of contact points between the guiding shafts 801 and 802 and the abutting surfaces 703 of the first abutting structure 701 and the second abutting structure 702, respectively, and the contact points are respectively defined as contacts. Lines C4, C5 and C6. In other words, as long as the magnetic attraction occurs, based on the structural design of the open hole of the first abutting structure 701, there are two contact lines C4, C5 between the guiding shaft 801 and the first abutting structure 701, and the guiding There is only a single contact line C6 between the shaft 802 and the second abutment structure 702.

Here, the length of the contact wires C4, C5, C6 should be at least half the length of the guiding shafts 801 and 802 to ensure that the guiding shafts 801 and 802 abut the first during the movement of the movable magnetic circuit member 70. The close contact of the structure 701 with the second abutment structure 702.

Since the abutting faces 703 are all flat, not curved, even if the movable magnetic circuit component 70 rotates in the rotational direction R, the two contact wires C4, C5 between the guiding shaft 801 and the first abutting structure 701, The single contact line C6 between the guide shaft 802 and the second abutting structure 702 is linear, and does not become a spiral shape, and the posture or the inclination angle stability of the movable magnetic circuit member 70 during movement is improved.

In order to improve the posture or the inclination angle stability of the movable magnetic circuit member 70 during the movement, there is a difference between the master and the slave in the above two sets of contact relationships. Based on the magnetic attraction force of the magnetic sensitive element, the main guiding shaft 801 and the first abutting structure 701 are in contact with each other by two contact lines C4, C5, and the secondary guiding shaft 802 is second with the second. The abutment structures 702 are in contact with each other in a single contact line C6.

Please refer to FIGS. 7A-7B, and FIGS. 7A-7B are schematic views of the angle between the contact surface and the contact angle of the present invention. As shown in FIGS. 7A-7B, the abutting faces 703 of the second abutting structure 702 have an angle of contact with each other, and the other of the set of guiding shafts 801, 802 is abutted against the second abutting structure 702. The two contact lines C4, C5 between the facing faces 703 have a contact angle with each other. There is a relative change between the angle between the contact surface and the contact angle, that is, the larger the contact angle is, the smaller the contact angle is, or the smaller the contact angle is, the larger the contact angle is. For example, as shown in FIG. 7A, when the contact surface is at an angle of 90 degrees, the contact angle is 90 degrees, but as shown in FIG. 7B, when the contact angle is less than 90 degrees, the contact angle is greater than 90 degrees.

In addition, the main guiding shaft 801 or the secondary guiding shaft 802 is mainly defined according to the number of contact lines, as long as two contact lines are the main guiding shaft 801, and only one contact line C6 is defined as The desired guide axis 802.

The features and spirit of the present invention are more clearly described in the above detailed description of the preferred embodiments, and the scope of the present invention is not limited by the preferred embodiments disclosed herein. On the contrary, it is intended to cover all kinds of changes and equivalences within the scope of the patent application to which the present invention is intended.

30‧‧‧Base

70‧‧‧ movable magnetic circuit components

701, 702‧‧‧ Dependent structure

705‧‧‧ openings

801, 802‧‧‧ guide shaft

Claims (8)

A voice coil motor capable of stably moving a moving member, comprising: a base; a set of guiding shafts fixed on the base; a movable magnetic circuit component having a magnetic sensing component and rigidly connected with a load mounting sliding seat, The outer portion of the movable magnetic circuit component has a first abutting structure and a second abutting structure, and the first abutting structure and the second abutting structure each have an elongated structure of at least two abutting faces. The abutting surfaces are all planar, and the first abutting structure and the second abutting structure are both open; wherein the set of guiding axes abuts against the first abutment based on the magnetic attraction force of the magnetic sensitive component Relying on the structure and the second abutting structure, and one of the set of guiding shafts and the abutting surface of the first abutting structure are in contact by a single contact line, and the other of the set of guiding axes The contact surface of the second abutting structure is in contact with two contact lines. The voice coil motor of the movable movable member according to claim 1, wherein the abutting surface is a plane formed by a long side and a short side. The voice coil motor of the movable movable member according to claim 2, wherein the short side of the abutting surface has a length at least a radius of the guiding shaft. As claimed in the first paragraph of the patent application, the voice coil horse can be stably moved. And wherein the contact line is formed by a plurality of contact points between one of the group guiding shafts and the abutting surface of the first abutting structure or the second abutting structure. The voice coil motor of the movable movable member according to claim 1, wherein the contact line between the set of guiding shafts and the first abutting structure or the second abutting structure The length is at least half the length of the guiding shaft to ensure that between the first abutting structure or the second abutting structure, between the set of guiding shafts during the movement of the movable magnetic circuit component Close contact. The voice coil motor of the movable movable member according to claim 1, wherein the abutting faces of the second abutting structure have an angle of contact with each other, and the other of the group of guiding axes The two contact lines with the abutting surface of the second abutting structure have a contact angle with each other, and the contact angle of the contact surface is opposite to the change of the contact angle. For example, the voice coil motor of the movable moving member described in claim 6 is characterized in that the larger the contact angle is, the smaller the contact angle is, or the smaller the contact angle is, the larger the contact angle is. The voice coil motor of the movable movable member according to claim 1, wherein the first abutting structure and the second abutting structure of the outer portion of the load mounting slider have a position setting symmetry.