CN108681030B - Lens driving device and base thereof - Google Patents
Lens driving device and base thereof Download PDFInfo
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- CN108681030B CN108681030B CN201810463594.8A CN201810463594A CN108681030B CN 108681030 B CN108681030 B CN 108681030B CN 201810463594 A CN201810463594 A CN 201810463594A CN 108681030 B CN108681030 B CN 108681030B
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- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 17
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 31
- 230000002093 peripheral effect Effects 0.000 claims description 26
- 238000001746 injection moulding Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000007667 floating Methods 0.000 abstract description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
- H02K41/0352—Unipolar motors
- H02K41/0354—Lorentz force motors, e.g. voice coil motors
- H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The invention relates to a lens driving device, wherein two conductive pieces made of high magnetic conductive materials which are not connected with each other are embedded in a base, holes capable of exposing the two conductive pieces are formed in the position, used for being connected with a rear side reed, of the base, and the two rear side reeds are respectively and electrically connected with the two conductive pieces through the holes. The base of the lens driving device is internally embedded with the conductive piece made of the high magnetic conductive material, so that when a product is assembled, a large-area magnet can be arranged on an assembling surface, and then the base is arranged on the magnet for assembly, so that the base is firmly fixed on a jig by virtue of large downward magnetic attraction force, the situation of floating and deflection caused by the influence of the driving magnet is not easy to occur, the assembly of the product is facilitated, and a compression bar is not required to be redesigned to limit the movement of the base. And the base can be manufactured in an injection molding mode, the conductive piece is wrapped in the base at one time, and the manufacturing process is simple.
Description
Technical Field
The invention relates to a lens driving device and a base thereof.
Background
At present, with the development of technology and the improvement of living standard, the mobile phones have more and more photographic functions, and the requirements on the cameras of the mobile phones are also higher and higher. Among existing cameras, a VCM (Voice Coil Motor) is widely used, which has an auto-focusing function and can adjust the position of a lens, thereby presenting a clearer image.
The base of VCM is injection moulding, in the equipment in-process, needs extra design depression bar to restrict the removal of base, avoids the base to remove the error that leads to on the equipment, and such operation is comparatively troublesome. And the conductive terminal of the driving device connected with the external power supply is fixed on the base, so that the process is complex and the manufacturing time is long.
Disclosure of Invention
The invention aims to provide a lens driving device with a simple process, wherein a base is not easy to float and move during assembly.
A lens driving apparatus for driving a lens defining an object to be photographed positioned in front of the lens in an optical axis direction, the lens driving apparatus comprising:
a base;
the lower end of the shell is connected with the base and forms an accommodating space together with the base;
a lens holder on which a through hole for loading the lens is formed;
an elastic member for suspension-supporting the lens holder within the housing; and
a driving unit for driving the lens holder to move in the direction of the lens optical axis;
the base is embedded with at least two conductive pieces made of high magnetic conductive materials which are not connected with each other, holes capable of exposing the at least two conductive pieces are formed in the base at the positions where the base is connected with the elastic members, and the elastic members are respectively and electrically connected with the at least two conductive pieces through the holes.
As one embodiment, the housing is made of a low magnetic permeability material or a non-magnetic permeability material.
As one embodiment, the elastic member includes:
a front side reed, the inner side of which is connected with the front end of the lens bracket, and the outer side of which is connected with the shell or the base; and
the rear side reed is divided into at least two pieces which are not connected with each other, the inner side part of each piece is connected with the rear end of the lens support, the outer side part of each piece is connected with the base, and the rear side reed is respectively and electrically connected with the at least two conductive pieces through the holes.
As one embodiment, the base includes:
a bottom plate with a through hole formed at the center thereof;
a plurality of posts extending vertically from the base plate; and
a plurality of limit parts extending from the bottom plate or the plurality of upright posts;
the driving unit comprises a driving coil fixed on the outer peripheral side wall of the lens bracket and a plurality of driving magnets fixed on the base, and the driving magnets are in spaced opposition to the driving coil; each driving magnet is limited between two upright posts in a first direction perpendicular to the optical axis direction, and is limited at least one limiting part in the direction towards the driving coil opposite to the driving magnet, so that the plurality of limiting parts can limit the distance between the driving magnet and the driving coil opposite to the driving magnet.
As one embodiment, the at least two conductive members are formed with a plurality of first conductive sheets, and each limiting portion is embedded with at least one first conductive sheet.
As one embodiment, the area ratio of the conductive member to the bottom plate is 20% -50% as viewed from the direction of the optical axis of the lens.
In one embodiment, when the number of the driving coils is plural, the plurality of driving coils may be wound around the direction perpendicular to the optical axis of the lens, or may be wound around the outer peripheral wall of the lens holder around the optical axis of the lens; when the number of the driving coils is one, the driving coils are wound on the outer peripheral wall of the lens bracket around the optical axis direction of the lens; at least two winding posts and a wire groove for guiding wires electrically connected with the driving coil and the elastic member are also formed on the peripheral wall of the lens bracket; the driving magnets are arranged at intervals, and the at least two winding posts are arranged in the interval between one driving magnet and are not opposite to any driving magnet; the outer peripheral wall of the lens support is also provided with a position sensing magnet or an inductor, and the position sensing magnet or the inductor is arranged in the interval between the other driving magnets.
As one embodiment, the base further comprises a support plate extending vertically from the bottom plate for fixing a circuit board; a second hole capable of exposing the at least two conductive pieces is formed in the position of the supporting plate for fixing the circuit board, and the circuit board is electrically connected with the at least two conductive pieces through the second hole respectively; when the position sensing magnet is arranged on the outer peripheral wall of the lens bracket, the position sensing magnet is opposite to the circuit board, and a position sensing sensor is arranged on the circuit board; when the sensor for position sensing is provided on the outer peripheral wall of the lens holder, the sensor for position sensing is opposed to the circuit board, and the magnet for position sensing is provided on the circuit board.
The base of the lens driving device is internally embedded with the conductive piece made of the high magnetic conductive material, so that when a product is assembled, a large-area magnet can be arranged on an assembling surface, and then the base is arranged on the magnet for assembly, so that the base is firmly fixed on a jig by virtue of large downward magnetic attraction force, the situation of floating and deflection caused by the influence of the driving magnet is not easy to occur, the assembly of the product is facilitated, and a compression bar is not required to be redesigned to limit the movement of the base. And the base can be manufactured in an injection molding mode, the conductive piece is wrapped in the base at one time, the manufacturing process is simple, the conductive terminal is not easy to fall off, and the quality is more stable.
Drawings
Fig. 1 is an exploded view of a lens driving device according to the present invention.
Fig. 2 is a schematic diagram of the overall structure of the base in fig. 1.
Fig. 3 is a top view of the lens holder of fig. 1.
Fig. 4 is a schematic diagram of a winding state of a coil when a winding post of a rotationally symmetrical design is adopted in the prior art.
Fig. 5 is a schematic view illustrating a lens holder and a coil winding state according to an embodiment of the invention.
Detailed Description
The invention will be described in further detail with reference to specific embodiments and drawings.
The lens driving device of the present invention is a VCM (Voice Coil Motor) driving Motor, and the driving member is a driving Coil and a driving magnet which are opposed to each other with a space therebetween. The support member includes a lens holder for loading a lens, a peripheral support member provided on an outer peripheral side of the lens holder, and an elastic member for suspending the lens holder in the peripheral support member. One of the drive coil and the drive magnet is fixed to the lens holder, and the other is fixed to the peripheral support member. In operation, the driving coil in the magnetic field of the driving magnet is electrified, and the generated lorentz force is utilized to push the lens support to realize the focusing driving function of the lens. In addition, the closed-loop control function can be realized by arranging a sensor for position sensing and a magnet.
The lens support may have a substantially (i.e. substantially or approximately) circular or square or hexagonal polygonal shape, the magnets may be straight or arc or L-shaped, and the peripheral support members may be correspondingly shaped. The driving coil may be wound around a direction perpendicular to the optical axis of the lens and then fixed to the outer side wall of the lens holder, or may be wound around the optical axis direction of the lens on the outer peripheral wall of the lens holder. When the driving coils are wound around a direction perpendicular to the optical axis of the lens, the number is generally set to two (opposed and parallel across the lens holder), four (rotationally symmetrically disposed on the outer peripheral side wall of the lens holder), six, eight, or the like. When the driving coil is wound around the outer peripheral wall of the lens holder in the optical axis direction of the lens, the number is generally set to one or two (disposed back and forth in the optical axis direction). The plurality of driving magnets are arranged at intervals without being connected with each other, and are generally arranged in a rotationally symmetrical manner or an axially symmetrical manner.
In the following, a lens driving device having a substantially square outer shape will be described as an example, and two driving coils wound around a direction perpendicular to the optical axis of the lens and two driving magnets having a straight plate shape will be provided. Those skilled in the art will appreciate that the shape and number of component parts should not limit the scope of the present invention.
Hereinafter, for convenience of description, it is defined that the object is located in front of the lens driving device (i.e., lens), the side close to the object in the optical axis direction of the member is the front side (front, upper), and the side far from the object in the optical axis direction is the rear side (rear, lower). The direction parallel to the optical axis of the lens is defined as the Z direction, and two directions perpendicular to the Z direction and perpendicular to each other are distributed as the X direction and the Y direction.
As shown in fig. 1, 2 and 3, in an embodiment of the present invention, the lens driving device mainly includes a base 1, a housing 2 fastened to the base 1 from the front of the base 1, and a housing space defined by the housing 2 and the base 1: a lens holder 3 formed with a through hole for loading a lens (not shown), two driving coils 31 fixed to the outer peripheral side wall of the lens holder 3, two driving magnets 32 provided on the outer peripheral side of the driving coils 31, a conductive member 4 embedded (i.e., wrapped, not visible from the outside of the base) in the base 1, an elastic member 5 for suspending the lens holder 3 inside the housing 2 and allowing the lens holder 3 to move in the optical axis direction, and a circuit board 6 mounted on the base 1.
The casing 2 is in a square cover shape, and comprises a square cover plate and four side walls extending from four sides of the cover plate integrally. The lower end of the side wall is connected with the base. The housing 2 is made of a low magnetic permeability material or a non-magnetic permeability material. Here, the magnetic permeability (magnetic permeability, generally denoted by the symbol μ, μ being equal to the ratio of the magnetic induction B to the magnetic field H in the magnetic medium, i.e., μ=b/H) is defined as a high magnetic permeability material, and a magnetic permeability lower than 1.5 is defined as a low magnetic permeability material.
The base 1 is used for fixing the driving magnet 32, the circuit board 6, the elastic member 5, and the conductive member 4. The base 1 includes a substantially quadrangular bottom plate 11, upright posts 12 extending perpendicularly from four corners of the bottom plate 11, a plurality of stopper portions 13 extending perpendicularly from the bottom plate 11, and support plates 14, 15. The middle part of the bottom plate 11 is provided with a through hole opposite to the lens. The pillars 12 extend vertically from four corners of the base plate 11, and are formed with unfilled corners on the outer sides in the radial direction of the lens, so that corners of the front surface of the base plate 11 are exposed (i.e., the pillars form a clearance space at the most corner of the base plate 11), and of the four corners corresponding to the clearance space, two opposing corners are formed with projections 111, and the other two opposing corners are formed with holes 112 for exposing the conductive members 4 embedded in the base plate 1. A protrusion 121 is also formed on the front end surface of the pillar 12 for connecting the elastic member 5. Due to the upright posts 12, when the shell 2 is connected with the base 1, the outer side surface of the upright posts 12 can be adhered to the inner side surface of the shell 2, so that the adhesion area of the two is obviously increased, and the overall structural strength of the lens driving device is enhanced.
In this embodiment, four limiting portions 13 are provided, and each limiting portion extends from two sides of the base plate 11, and is substantially in a rectangular plate shape with a surface parallel to the X direction. Here, the limit portion 13 is defined to be located on the +y side and the-Y side of the chassis 1. The two limit parts 13 located at the +y side are respectively connected to the two upright posts 12 located at the +y side, that is, one side edge (+x side or-X side) of the limit parts 13 is connected to the upright post 12. Similarly, the two limiting portions 13 on the-Y side are respectively connected to the two columns 12 on the-Y side, that is, one side (+x side or-X side) of the limiting portions 13 is connected to the column 12. And, the column 12 has a side surface 122 parallel to the Y direction, and the side surface 122 meets one surface 132 of the stopper 13 parallel to the X direction, thereby forming an L-shaped stopper structure. The two side end surfaces of the driving magnets 32, i.e., + X side end surface and-X side end surface, are in contact with the side surfaces 122 of the columns 12 (may also be simultaneously connected by gluing), so that each driving magnet 32 is located between two columns 12 at the upper limit in the Y direction. The end surface of the driving magnet 32 in the direction of the driving coil 31 facing thereto is brought into contact with (preferably simultaneously connected by adhesive) the surface 132 of the stopper 13, and thereby is stopped at the stopper 13 in the direction toward the lens. Since the stopper 13 is located between the driving magnet 32 and the driving coil 31, the stopper 13 restricts the distance between the driving magnet 32 and the driving coil 31 opposite thereto. It will also be appreciated that the two L-shaped limiting structures and the inner wall of the housing 2 form a space therebetween in which the driving magnet 32 is just accommodated, and that the driving magnet 32 is disposed in the space, so that the translation of the driving magnet 32 and the distance between the driving magnet 32 and the driving coil 31 can be restricted. In addition, the stopper 13 can also restrict the position of the driving magnet 32 in the direction parallel to the optical axis. Therefore, a plastic part bracket which is fixed on the inner side of the shell and used for limiting the driving magnet and the FPC in the existing driving device is omitted.
The support plates 14, 15 are integrally extended from the side edges of the bottom plate 11 on the-X side and the +x side, and the end portions of both sides are connected to the column 12. The support plate 15 is used for fixing the circuit board 6, elements such as a position detection sensor are arranged on the circuit board 6 and are protruded on the surface of the circuit board 6, and correspondingly, holes are formed in the support plate 15 for enabling the circuit elements to be in spaced opposition with the lens support and the elements thereon. The lens holder 3 is provided with a position detecting magnet facing the position detecting sensor with a space therebetween. A part of the outer side surfaces of the support plates 14, 15 may be adhered to the inner side surface of the housing 2, so that the adhesion area of the chassis 1 and the housing 2 is remarkably increased, and the overall structural strength of the lens driving apparatus is enhanced.
In addition, as described above, the base 1 is embedded (wrapped) with two conductive members 4 made of high magnetic conductive material that are not connected to each other, that is, the conductive members 4 are wrapped in the base 1 during injection molding of the base 1. In this embodiment, the two conductive members 4 are respectively disposed near the two sets of limiting portions 13, that is, are respectively disposed at the +y side and the-Y side of the base 1. Each conductive member 4 includes a second conductive sheet 43 perpendicular to the optical axis direction, i.e., the Z direction, two first conductive sheets 44 and two third conductive sheets 42 integrally extending perpendicularly from the second conductive sheet 43. The two first conductive pieces 44 are respectively embedded in the two stopper portions 13 located at the +y side or the-Y side. Therefore, when the driving magnet 32 is assembled, the first conductive sheet 44 is attracted to the driving magnet, so that the driving magnet 32 can be positioned and assembled accurately, and meanwhile, the first conductive sheet is used as a magnetic conductive sheet of the driving magnet, so that the magnetic field is prevented from overflowing, and the elements such as a sensor for detection are prevented from being interfered. The third conductive plates 42 are embedded in the supporting plate 15, and the supporting plate 15 is formed with a second hole 152 for exposing a portion of the third conductive plates 42, and the circuit board 6 is electrically connected to the third conductive plates 42 through the second hole 152. It will be appreciated that the base 1 is also formed with holes for exposing the conductive sheet to connect to an external power supply.
In addition, the second conductive sheet 43 of each conductive member 4 further extends an L-shaped fourth conductive sheet 41. That is, the fourth conductive sheet 41 is first vertically extended from the second conductive sheet 43, and then bent and extended toward the outside, and is formed in an L shape. And, the fourth conductive sheet 41 extends to the hole 112 of the base plate 11 so that a portion thereof is exposed, facilitating connection with the elastic member 5.
In particular, the area ratio of the conductive member 4 to the bottom plate 11 is 20% -50% as viewed from the direction of the optical axis of the lens, so that when assembling a product, a large-area magnet can be arranged on the assembling surface, and then the base 1 is arranged on the magnet for assembly, so that the base 1 is stably fixed on the jig by virtue of large downward magnetic attraction force, and is not easy to float and skew due to the influence of the driving magnet, the product is convenient to assemble, and the movement of the base 1 is limited without redesigning a compression bar.
The elastic member 5 includes a front side leaf 51 and a rear side leaf 52 each including an inner portion for connection with the lens holder 3, an outer portion for connection with the base 1, and a wrist portion extending in a meandering manner for connection of the inner portion and the outer portion. In the present embodiment, the inner side of the front side reed 51 is formed in a substantially annular shape and is connected to the front end of the lens holder 3, and the outer side of the front side reed 51 is also formed in a substantially annular shape and is connected to the front end surface of the pillar 12 and is engaged with the boss 121. The rear side reed 52 is required to be a conductive path, and thus is divided into two pieces which are not connected to each other, the inner side of each piece is connected to the rear end of the lens holder, and the outer side of each piece is connected to four corners of the bottom plate 11 and is electrically connected to the corresponding conductive member 4 through the hole 112.
In this way, the elastic member 5 suspension-supports the lens holder 3 inside the housing 2, and allows the lens holder 3 to move in the optical axis direction.
As described above, in the present embodiment, the lens holder 3 has a substantially square shape, and the two driving coils 31 are spaced apart from and opposed to the two driving magnets 32 in the direction perpendicular to the optical axis of the lens, in the present embodiment, in the Y direction. Two winding posts 33 are also formed on the outer peripheral wall of the lens holder 3 in the-X direction, and wire grooves for guiding wires electrically connecting the driving coil and the elastic member are also formed on the mounting portions of the lens holder from the winding posts 33 to the driving coil 31 and the mounting portions from the winding posts 33 to the rear-side reed 52. The two wires led out from the driving coil 31 reach the spool 33 along the wire groove, then rotate around the spool 33 for several weeks, reach the portion of the lens holder connected to the rear side reed 52 along the wire groove, and are electrically connected to the rear side reed 52. In this embodiment, the two bobbins 33 are provided on the same side, i.e., -X side, of the lens holder 3, i.e., the side on which the driving magnet is not provided, while facing away from the other side on which the position sensing magnet is provided. Thus, the wire groove is only required to be arranged on the same side of the lens bracket 3 as the winding post 33, the length of the wire groove is greatly shortened, the design difficulty of the die is reduced, the available space of other parts is increased, and the overall structure is developed towards the miniaturization trend. Similarly, two driving magnets 32 are correspondingly arranged on the lens support, when two winding posts 33 are arranged on the same side of the non-corresponding magnets, the winding mode of the driving coil 31 is simple, the winding distance is short, and the design difficulty of the wire groove is reduced. When two winding posts 33 are both disposed on opposite sides of the circuit board 6, the design of the winding posts will not affect the use of the circuit board, and the winding posts 33 have more space, so that the design of the winding posts 33 is more reasonable.
In other embodiments, when the driving coil is wound around the direction parallel to the optical axis direction and two winding posts 33 disposed on the same side of the lens holder 3 are used, the problem of the difference in winding number of the coils on both sides of the lens holder caused by the rotationally symmetrical winding posts in the prior art can be overcome (refer to fig. 4). When the rotationally symmetrical winding post is employed as in fig. 4, the driving coil starting end starts winding from the winding post located at the upper side of fig. 4 and ends winding at the winding post located at the lower side of fig. 4, there occurs a case where the number of windings of the driving coil located at the left side of the lens holder in fig. 4 is smaller than that at the right side, resulting in unbalanced magnetic pushing force generated at the time of driving. In the winding post scheme of the present invention, as shown in fig. 5, the number of windings of the coil on both sides of the lens holder, which are spaced apart from the driving magnet, is completely equal.
When the number of driving coils and driving magnets used is increased, the number of winding posts is correspondingly increased. However, no matter how three or more winding posts 33 are provided, the positions of the winding posts 33 should be designed so as to be within the space between two driving magnets, not to be opposed to any driving magnet, and the position sensing magnet or sensor should be provided within the space between the other driving magnets. The same effects as those of the above embodiment can be achieved.
In operation, the conductive member is electrically connected to an external power supply to supply power to the circuit board 6, and simultaneously, the elastic member 5 supplies power to the driving coil 31 to drive the lens. The whole device only adopts a wire when the back side reed is connected with the driving coil, other conductive paths are all built-in, point-to-point welding can be realized, a circuit is more stable, and the improvement and optimization of performance on the lens module are facilitated.
In other embodiments, when the base plate is of other shape, the posts 12 are symmetrically, preferably rotationally symmetrically, disposed on the base plate. In other embodiments, the limiting portion may extend from the upright along the X direction and not contact the bottom plate, or the limiting portion may extend from the bottom portion and not contact the upright. In other embodiments, when the bottom plate has another shape, a part of the surface of the bottom plate that is free from the corner of the pillar is exposed, and the pillar is not necessarily provided at the corner as a position to be connected to the elastic member 5. In other embodiments, the base plate may be provided with both the studs 111 and the holes 112 at the location for connection with the resilient member 5. In other embodiments, the number of the limiting portions may be two or more than four, and the shape is not limited to a plate shape, as long as the limiting portions have a plane parallel to the X direction. The column 12 and the stopper 13 may have other shapes, so that the translation of the driving magnet 32 and the distance between the driving magnet 32 and the driving coil 31 may be restricted. In other embodiments, when the position sensor is provided on the outer peripheral wall of the lens holder, the position sensor is opposed to the circuit board, and the position sensor magnet is provided on the circuit board. In other embodiments, two or more first conductive sheets are embedded in each of the limiting portions. In other embodiments, the conductive sheet may not be embedded in the limiting portion, and the conductive sheet made of the high magnetic conductive material may be directly attached to the surface of the limiting portion, so that the same technical effect may be achieved.
In other embodiments, the back side reed may be divided into three or more parts that are independent and not connected to each other, and the number of the high magnetic conductive pieces embedded in the base is three or more or still two, so that different parts of the back side reed are electrically connected to the corresponding high magnetic conductive pieces according to different circuit function designs. In other embodiments, when the number of conductive elements embedded in the base is three or more, one or more of the conductive elements may be made of a low magnetic conductive material or a non-magnetic conductive material.
While the invention has been described in conjunction with the specific embodiments above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, all such alternatives, modifications, and variations are included within the spirit and scope of the following claims.
Claims (5)
1. A lens driving apparatus for driving a lens defining an object to be photographed positioned in front of the lens in an optical axis direction, the lens driving apparatus comprising:
a base;
the lower end of the shell is connected with the base and forms an accommodating space together with the base;
a lens holder on which a through hole for loading the lens is formed;
an elastic member for suspension-supporting the lens holder within the housing; and
a driving unit for driving the lens holder to move in the direction of the lens optical axis;
the base is embedded with at least two conductive pieces made of high magnetic conductive materials which are not connected with each other, holes capable of exposing the at least two conductive pieces are formed in the base at the positions for connecting with the elastic members, and the elastic members are respectively and electrically connected with the at least two conductive pieces through the holes;
wherein, the base includes:
a bottom plate with a through hole formed at the center thereof;
a plurality of posts extending vertically from the base plate; and
a plurality of limit parts extending from the bottom plate or the plurality of upright posts;
the driving unit comprises a driving coil fixed on the outer peripheral side wall of the lens bracket and a plurality of driving magnets fixed on the base, and the driving magnets are in spaced opposition to the driving coil; each driving magnet is limited between two upright posts in a first direction perpendicular to the optical axis direction, and is limited at least one limiting part in the direction towards the driving coil opposite to the driving magnet, so that the plurality of limiting parts can limit the distance between the driving magnet and the driving coil opposite to the driving magnet;
a plurality of first conductive sheets are formed on the at least two conductive pieces, and at least one first conductive sheet is embedded in each limiting part;
the area ratio of the conductive piece to the bottom plate is 20% -50% when viewed from the direction of the optical axis of the lens.
2. The lens driving apparatus according to claim 1, wherein the housing is made of a low magnetic conductive material or a non-magnetic conductive material; each conductive piece comprises a second conductive sheet perpendicular to the optical axis direction, two first conductive sheets integrally and vertically extending from the second conductive sheet, and an L-shaped fourth conductive sheet extending from the second conductive sheet; the two first conducting strips are respectively embedded in the two limiting parts; the fourth conductive sheet extends first vertically from the second conductive sheet and then is bent and extended toward the outside to be formed in an L shape, and extends to the hole so that the fourth conductive sheet is partially exposed to be connected with the elastic member.
3. The lens driving apparatus according to claim 2, wherein the elastic member includes:
a front side reed, the inner side of which is connected with the front end of the lens bracket, and the outer side of which is connected with the shell or the base; and
the rear side reed is divided into at least two pieces which are not connected with each other, the inner side part of each piece is connected with the rear end of the lens support, the outer side part of each piece is connected with the base, and the rear side reed is respectively and electrically connected with the at least two conductive pieces through the holes.
4. The lens driving apparatus according to claim 2, wherein when the number of the driving coils is plural, the plural are each wound around a direction perpendicular to the optical axis of the lens or are each wound around an outer peripheral wall of the lens holder in the direction of the optical axis of the lens; when the number of the driving coils is one, the driving coils are wound on the outer peripheral wall of the lens bracket around the optical axis direction of the lens; at least two winding posts and a wire groove for guiding wires electrically connected with the driving coil and the elastic member are also formed on the peripheral wall of the lens bracket; the driving magnets are arranged at intervals, and the at least two winding posts are arranged in the interval between one driving magnet and are not opposite to any driving magnet; the outer peripheral wall of the lens support is also provided with a position sensing magnet or an inductor, and the position sensing magnet or the inductor is arranged in the interval between the other driving magnets.
5. The lens driving apparatus as claimed in claim 4, wherein the base further comprises a support plate vertically extended from the base plate for fixing a circuit board; a second hole capable of exposing the at least two conductive pieces is formed in the position of the supporting plate for fixing the circuit board, and the circuit board is electrically connected with the at least two conductive pieces through the second hole respectively; when the position sensing magnet is arranged on the outer peripheral wall of the lens bracket, the position sensing magnet is opposite to the circuit board, and a position sensing sensor is arranged on the circuit board; when the outer peripheral wall of the lens bracket is provided with a position sensing sensor, the position sensing sensor is opposite to the circuit board, and the circuit board is provided with a position sensing magnet; each conductive piece comprises two third conductive pieces extending from the second conductive pieces, the third conductive pieces are embedded in the supporting plate, and the circuit board is electrically connected with the third conductive pieces through the second holes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810463594.8A CN108681030B (en) | 2018-05-15 | 2018-05-15 | Lens driving device and base thereof |
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| CN201810463594.8A CN108681030B (en) | 2018-05-15 | 2018-05-15 | Lens driving device and base thereof |
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| CN108681030A CN108681030A (en) | 2018-10-19 |
| CN108681030B true CN108681030B (en) | 2024-02-02 |
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| CN108681030A (en) | 2018-10-19 |
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Effective date of registration: 20211217 Address after: Xiangshuihe Industrial Park, Dayawan Economic and Technological Development Zone, Huizhou City, Guangdong Province Applicant after: Huizhou Sazhide Optoelectronics Technology Co.,Ltd. Address before: 516083 4th floor, No.6 workshop, Yongchang electronics company, Xiangshuihe Industrial Park, Daya Bay, Huizhou City, Guangdong Province Applicant before: HUIZHOU DAYA BAY JSS OPTICAL TECHNOLOGY Co.,Ltd. Applicant before: HUIZHOU DAYA BAY EVER BRIGHT ELECTRONICS & INDUSTRIAL Co.,Ltd. Applicant before: JSS OPTICAL TECHNOLOGY Co.,Ltd. |
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