TWI400861B - 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 load mounting shoe 10 of a movable magnetic circuit member (not depicted) and a plurality of guide shafts 12. The lens holder 10 has a plurality of perforations 101, and a plurality of guide shafts 12 fixed to a base (not depicted) are relatively passed through the perforations 101 so that the lens holder 10 of the movable magnetic circuit member can follow a plurality of The guide shaft 12 is moved up and down in a straight line. If you need optical focusing When a set of coils of a fixed circuit component (not depicted) are required to be powered, the pair of coils of the fixed circuit component interact with the main magnetic flux provided by the magnetically sensitive component (not depicted) of the movable magnetic circuit component, The load mounting carriage 10 (usually carrying the lens) of the movable magnetic circuit component is linearly moved up and down following a plurality of guide shafts 12.

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 been passed through the perforation, the guiding shaft 12 will be in close contact with and contact 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 axis slides in a plane, the guide shaft is in line contact with the wall of the perforation 101 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 load mounting carriage 10 slides or stops sliding along the guide shaft 12, resulting in a load mounting slide. The image taking lens on the 10 has a problem that the image is unclear.

Traditionally, only two lines of contact between the two guiding metals and the perforations have resulted in There will be a 360-degree annular contact line between them, which causes the load mounting slide 10 to slide or stop sliding when there is a large difference in posture, and there is a problem that the image is unclear.

To this end, the main object of the present invention is to provide a voice coil motor capable of stably moving a moving member, which mainly has two points of contact with a single point of the guide shaft and the perforated hole wall, and is provided by two-point contact. The main contact position and the use of a single line contact with a large degree of freedom to absorb the deflection and skew of the guide steel shaft.

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 load mounting slide has two perforations. Based on the magnetic attraction of the magnetic sensing element to the set of guiding axes, the set of guiding axes and the perforated wall respectively have two points in line contact with a single point.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 3, which is a first embodiment of the voice coil motor of the present invention. As shown in FIG. 3, the voice coil motor of the movable movable member of the present invention comprises a base 30, a set of guiding shafts 401 and 402 (made of a magnetic conductive metal) fixed on the base 30, and a fixed circuit component 50 ( Mainly composed of a coil), a movable magnetic circuit member 60 (including a magnetic sensitive element 61 and rigidly connected with a load mounting slide 62). Among them, load installation The carriage has two different shaped holes perforations 601 and 602 and the apertures of the perforations 601 and 602 are sufficient to be passed through the set of guide shafts 401 and 402, respectively. When the set of guiding shafts 401 and 402 are magnetically permeable metals, the leakage magnetic field of the magnetic sensitive component 61 and the set of guiding axes 401 and 402 that are magnetically permeable produce a magnetic attraction force.

Please refer to FIG. 4, which is a second embodiment of the voice coil motor of the present invention. As shown in FIG. 4, the voice coil motor of the present invention is characterized in that the voice coil motor of the movable moving member comprises a base 30, a set of guiding shafts 401 and 402 (non-magnetic conductive material) fixed on the base 30, and a fixed circuit component 50 (mainly The magnetic coil member 60 (including the magnetic sensitive element 61 and rigidly connected to the load mounting slider 62) and the magnetic conductive metal casing 70. Among these, the load mounting slide also has two different shaped holes of the perforations 601 and 602 and the perforations 601 and 602 have sufficient apertures to be passed through the set of guide shafts 401 and 402, respectively. When the set of guiding shafts 401 and 402 are non-magnetically conductive, the leakage magnetic field of the magnetic sensitive element 61 and the magnetically conductive metal casing 70 generate magnetic attraction.

Briefly, as shown in FIG. 5A, based on the magnetic attraction of the magnetic sensing element 61 to the guiding axes 401 and 402 that have been passed through the perforations 601 and 602, the guiding axes 401 and 402 are in contact with the perforations 601 and 602. Kong Tong. 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, wherein one set is contacted by a single contact line C1, The other group is in contact with two contact lines C2 and C3. 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 is due to the through hole 601. The characteristics of the structure can have a large degree of freedom of left and right offset so as to absorb the offset and skew when a posture difference as shown in Figs. 2A to 2B occurs.

In order to have the above two contact lines C2 and C3 between the perforation 602 and the guiding shaft 402, the cross section of the perforation 602 is circular and has a gradually narrowing portion, while the two walls of the tapered portion of the perforation 602 are in contact with each other. The guide shaft 402, or the cross section of the perforation 602, is in the shape of a drop or a weir, such that the water droplets of the perforations 602 or the two end walls of the braided tail portion contact the guide shaft 402. In any event, the aperture 602 has a smaller aperture than the aperture 601 but is slightly larger than the guide shaft 402 such that there are indeed contact lines C2 and C3 between the aperture 602 and the guide shaft 402 without becoming a single contact line. Meanwhile, in order to have the contact line C1 between the through hole 601 and the guide shaft 401 and the hole diameter of the through hole 601 is larger than the through hole 602, the guide shaft 401 is freely displaced left and right in the through hole 601 (when viewed from the plane of the plane), The cross section of the perforation 601 has a rectangular shape. In addition, if the position or size of the guide shafts 401 and 402 and the through holes 601 and 602 are varied during the manufacturing process, as long as the guide shaft 401 is freely displaced in the through hole 601, the guide shafts 401 and 402 can be smoothly worn. Through holes 601 and 602 without interference.

It is important to note that if the tolerances between the components in the voice coil motor can be made extremely small and negligible, the perforations 603 can also be rounded with a cross-section such as perforations 602 with a tapered portion or a perforation 602. The cross section is in the form of a drop or a weir, such that the contact between the guide shafts 401 and 402 and the perforations 601 and 603 is in contact with the two contact lines C2 and C3, C4 and C5, respectively, as shown in Fig. 5B.

The features and spirit of the present invention are more clearly described in the above detailed description of the preferred embodiments of the present invention. The scope of the invention is limited. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

10‧‧‧Load mounting slide

101‧‧‧Perforation

12‧‧‧Guide axis

30‧‧‧Base

401, 402‧‧‧ guidance axis

50‧‧‧Fixed circuit components

60‧‧‧ movable magnetic circuit components

61‧‧‧Magnetic components

62‧‧‧Load mounting slide

601, 602, 603‧‧‧ perforation

70‧‧‧Magnetic metal casing

C1, C2, C3, C4, C5‧‧‧ contact lines

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.

Fig. 3 is a schematic view showing the first embodiment of the voice coil motor of the present invention.

Figure 4 is a schematic view showing the second embodiment of the voice coil motor of the present invention.

5A-5B are schematic views of the perforation of the voice coil motor of the present invention.

401, 402‧‧‧ guidance axis

60‧‧‧ movable magnetic circuit components

62‧‧‧Load mounting slide

601, 602‧‧ perforation

C1, C2, C3‧‧‧ contact lines

Claims (10)

A voice coil motor capable of stably moving a moving member, comprising: a base; a set of guiding shafts, which are magnetically conductive metals, are fixed on the base; a fixed circuit component, mainly composed of coils; and a movable magnetic circuit component Having a magnetically sensitive component and rigidly connected to a load mounting slide, the load mounting slide has a first through hole and a second through hole, and the first through hole and the second through hole have sufficient apertures to be respectively guided by the group Passing through the shaft; wherein, based on the magnetic attraction of the pair of magnetic sensitive elements to the set of guiding axes that have been passed through the first through hole and the second through hole, one of the set of guiding axes and the first through hole The walls of the holes are in contact with each other by a single contact line, and the other of the set of guide shafts is in contact with the wall of the second perforated hole in a manner of two contact lines. The voice coil motor of the movable movable member according to claim 1, wherein the second through hole has a circular cross section and a gradually narrowing portion. Stable movement as described in item 2 of the patent application scope The voice coil motor of the piece, wherein the two hole walls of the gradually narrowing portion of the second through hole contact the other guiding shaft of the set of guiding shafts. The voice coil motor of the movable movable member according to claim 1, wherein the second through hole has a water droplet shape or a meander shape. The voice coil motor of the movable movable member according to claim 1, wherein the cross section of the first through hole has a rectangular shape. The voice coil motor capable of stably moving the moving member comprises: a base; a set of guiding shafts, which are non-magnetically conductive materials, are fixed on the base; a magnetic conductive metal shell; a fixed circuit component, mainly by a coil a movable magnetic circuit component having a magnetic sensitive component and rigidly connected with a load mounting slide, the load mounting slide having a first through hole and a second through hole, the first through hole and the second through hole having a diameter Sufficient to be respectively passed by the set of guiding shafts; wherein, based on the magnetic attraction of the magnetic component to the metal casing a force, one of the set of guiding shafts is in contact with the first perforated inner bore wall by a single contact line, and between the other of the set of guiding shafts and the second perforated inner bore wall Contact by means of contact lines. The voice coil motor of the movable movable member according to claim 6, wherein one of the set of guiding shafts and the first perforated inner wall are also in contact with each other by two contact lines. The voice coil motor of the movable movable member according to claim 7, wherein the cross section of the first through hole is circular and has a gradually narrowing portion. The voice coil motor of the movable movable member according to claim 8, wherein the two hole walls of the gradually narrowing portion of the first perforation contact one of the set of guiding shafts. The voice coil motor of the movable movable member according to claim 7, wherein the cross section of the first through hole has a water drop shape or a meander shape.