CN219740181U

CN219740181U - Optical driving device driven by electromechanical conversion component

Info

Publication number: CN219740181U
Application number: CN202222340822.7U
Authority: CN
Inventors: 陆圣
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2023-09-22
Anticipated expiration: 2032-09-02

Abstract

The utility model discloses an optical driving device driven by an electromechanical conversion component, which comprises a fixed component, a moving component, a driving component comprising the electromechanical conversion component respectively arranged on the fixed component and the moving component, and a magnetic attraction component comprising a magnetic attraction body. The arrangement of the two rows of the V-shaped ball guide grooves is improved to the arrangement of a main shaft guide groove and at least one auxiliary shaft guide groove, so that the delay and the blocking of the driving motor caused by interference caused by repeated constraint of the two rows of the V-shaped ball guide grooves can be avoided; the smoothness and stability of the driving device are improved, the optical axis precision is improved, and the manufacturing precision and cost are also reduced.

Description

Optical driving device driven by electromechanical conversion component

Technical Field

The present utility model relates to an optical drive device having an electromechanical conversion structure and a ball guide groove structure.

Background

The electromechanical transformation structure adopted on the existing intelligent equipment such as mobile phones and the like provides driving force in the following categories: spring-loaded VCM motors, ball-type VCM motors, piezoelectric SIDM motors, and memory alloy SMA mode motors, among others. The spring-type VCM has a certain dominant position in the market due to high process automation degree, mature technology and relatively low cost. However, with market development and price competition, the spring-loaded VCM motor has the following problems: the suspended structure of the spring piece is easy to move due to the optical axis caused by the posture difference, the cost of the spring piece is high, and the deformation amount of the spring piece is smaller and the stroke is short. Thus, the market demand for low cost and high precision, large travel products is strong. The ball VCM adopts a ball guide groove reference, does not need a suspended spring piece, and has relatively stable posture difference, large stroke and low cost. However, the ball motor of the related art has the following problems. The following describes the prior art patent documents in detail.

As a structural technical scheme for an optical drive device using a ball guide groove structure, there are the following publications:

reference 1: japanese patent laid-open No. 2015-007804 (with China CN 105929517B)

Reference 2: china CN211878281U

Reference 3: china CN105929517B

Reference 1 proposes a completely new VCM ball driving system in which driving members and ball guide members are provided at different positions on different sides from the driving members, and in which adverse factors such as friction force changes due to driving current changes are separated, and which has a greatly improved driving stability of a VCM motor, compared to the conventional art in which a driving member and a ball guide groove of an electromagnetic driving system (also referred to as a VCM system) are provided on the same side. However, the cross section of the ball guide groove adopts a V shape. Because the two rows of V-shaped guide grooves form two rows of references, each V-shaped inclined plane and the ball are not interfered with each other under the zero error condition, and the acting force is not changed; however, the parts are inevitably manufactured with errors, so that the pressing force and the action position of the inclined surface of the V-shaped guide groove and the balls are changed, and mutual interference is generated. The balls slide in the V-grooves and cause corresponding friction changes, so that the driving device generates hysteresis, jamming and optical axis movement. In order to solve the problems, the prior art adopts methods of improving the manufacturing precision of V-shaped grooves, such as improving the precision of molds, injection molding products, and the like. But this results in an increase in manufacturing cost and poor effect.

Reference 2 discloses a ball motor structure in which two rows of ball guide grooves are located at the apex corners of adjacent two sides. One of the two rows of ball guiding grooves has a V-shaped concave surface opposite to each other in cross section, and the other row has a structure with a V-shaped concave surface on one side and a plane on the opposite side. Compared with the ball guide groove structure with two rows of completely V-shaped balls, the driving stability caused by some manufacturing errors can be relieved to a certain extent because one surface is changed into a plane. However, V-shaped reference groove surfaces are still provided in both of the two parallel guide grooves on the same side, and overconstrained manufacturing errors still remain. In addition, the two rows of guide grooves are positioned at the same angle, and the too short distance between the guide grooves is not beneficial to stably supporting the moving part, so that the problems of unsmooth action, hysteresis, optical axis movement and the like are more easily caused.

Reference 3 discloses a structure also having two rows of V-shaped guide grooves, characterized in that only 1 ball is provided in one row of guide grooves, the other row is provided with a 3-point supported ball guide groove structure for supporting the balls, and grooves of different depths are provided in the V-shaped grooves to prevent the balls from coming off the V-shaped grooves. To a certain extent, the 3-ball supporting structure can reduce friction at contact points to a certain extent compared with the contact with more than 4 balls, so that the stability and interference problems of the traditional ball motor are relatively improved, but the over-constraint problem of the two-row V-shaped ball guide grooves is not changed due to the fact that the two-row V-shaped guide groove structure is still adopted. Therefore, this structure still has problems such as unsmooth, retardation, and optical axis movement.

The structural variety and technical problems of the ball guide groove of the VCM ball motor of the reference are summarized as follows:

1) The prior art with two rows of guide slots has the following two overconstrained dual spindle configurations:

one is that the two rows of guide grooves on the side of the fixed part and the two rows of guide grooves on the side of the corresponding moving part are both V-shaped

To be used for

The side wall of the V-shaped groove is in pressure contact with two points of the ball, namely, two rows of guide grooves on one side of the fixed part and two rows of guide grooves on two sides of one side of the movable part form a double main shaft;

the other is that one plane is arranged on one side of the fixed part or the moving part and is in single-point contact with the ball, and the opposite guide groove and the other guide groove are both V-shaped surfaces and are in pressure contact with the ball in two points by the side wall of the V-shaped groove. I.e. two rows of guide grooves on one side of the stationary or moving part form a double main shaft.

2) Overconstraining tends to create sliding friction and drag of the balls with the V-groove side walls, resulting in hysteresis and jamming of the ball drive, and optical axis movement.

3) On the premise of not changing over constraint, the improvement mode for improving the precision of the guide groove has high cost.

Therefore, the above references have resulted in a ball VCM that has not improved over-constraining structure for the double V-shaped guide slot. The market requires more efficient and low cost solutions to the problems of hysteresis, jamming and improving optical axis accuracy of the VCM ball motor.

Disclosure of Invention

In view of the above, it is an object of the present utility model to provide a method of: the problems of hysteresis and clamping can be solved without improving the control precision of the V-shaped guide groove, the productivity and the optical axis moving precision are better, and the manufacturing cost is lower than that of the novel ball VCM driving optical driving device with the traditional spring sheet type and the ball VCM motor.

In an embodiment of the present utility model, there is provided an optical drive motor of which electromechanical conversion is of an electromagnetic drive type (or generally referred to as VCM type), comprising:

a square-tube-shaped moving part (or lens carrier or tube) for accommodating the lens;

a box-shaped fixed member (or housing or fixed member frame) for accommodating the movable member;

a driving unit provided on the fixed member and the moving member, respectively, comprising: at least one driving coil mounted on at least one inner face of the fixing member; and at least one magnet for driving, which is arranged on at least one driving surface of the outside of the moving part opposite to the coil;

the support unit includes a fixing member guide groove having ball guide grooves provided at an inner periphery of the fixing member, each of the ball guide grooves extending in parallel in an optical axis direction; and a moving member guide groove disposed on an outer periphery of the moving member so as to face the ball guide groove of the fixed member guide groove; and a ball disposed between the fixed member guide groove and the moving member guide groove;

A magnetic attraction unit comprising: a magnet (or for position detection) provided on one side of the movable member and provided on a different side of the drive unit, and a magnetic member (e.g., iron plate) provided on the same side of the magnet as the magnet and opposite to the housing or the fixed member;

the detection unit can be properly matched according to open loop and closed loop requirements, and comprises: hall element, base plate;

at least two rows of ball guide grooves positioned in the fixed part guide groove and the movable part guide groove, wherein one row is a main groove serving as a reference main shaft, the cross section shape of the ball guide groove, which is in pressure connection with the ball position, is two opposite V-shaped grooves with or without bottom edges, the oblique edges at two sides of each V-shaped groove and the ball form an opposite two-point pressure connection mode, namely, the V-shaped grooves limit two points indicated by the ball respectively; when the main groove is a V-shaped groove with a bottom edge, the ball is not contacted with the bottom edge of the V-shaped groove of the main groove of the moving part; the other row is a secondary groove serving as a secondary shaft, and the cross section shape of the secondary groove pressed against the ball is preferably that at least one bottom edge is an opposite plane or arc, and the ball is pressed against the plane or arc in a single point. When the bottom edge is planar, the side walls may be provided on either side or on one side of the bottom edge, with the side walls being spaced from the ball surfaces so that the side walls do not normally contact the balls. The cross-sectional shape of the secondary groove is sub-optimal in that at least one bottom edge is a V-shaped groove, the ball is in contact with the bottom edge of the V-shaped groove, and a gap is reserved between the ball and at least one side wall of the V-shaped groove. The main shaft guide groove, the auxiliary shaft guide groove and the balls form a supporting unit; the main shaft guide groove on the fixed part is a main groove of the fixed part, the main shaft guide groove on the movable part is a main groove of the movable part, the auxiliary shaft guide groove on the fixed part is an auxiliary groove of the fixed part, and the amplitude shaft guide groove on the movable part is an auxiliary groove of the movable part.

Specifically, a gap is reserved between at least one side wall of the auxiliary groove of the fixed part and the ball, and a gap is reserved between at least one side wall of the auxiliary groove of the movable part and the ball; in particular, the stationary part sub-groove and the moving part sub-groove may be V-shaped grooves having bottom edges, and the balls may contact the bottom edges of the V-shaped grooves, with a gap being left between the balls and at least one side wall of the V-shaped grooves.

Or, the fixed part auxiliary groove is not provided with at least one side wall or at least one side wall of the fixed part auxiliary groove is not contacted with the balls, and a gap is reserved between at least one side wall of the movable part auxiliary groove and the balls; in particular, the auxiliary groove of the fixed part is a concave cambered surface or plane, the auxiliary groove of the movable part is a V-shaped groove with a bottom edge, the ball is contacted with the bottom edge of the V-shaped groove, and a gap is reserved between the ball and at least one side wall of the V-shaped groove. Wherein, the ball can roll the adjustment on the concave cambered surface.

Or, a gap is reserved between at least one side wall of the auxiliary groove of the fixed part and the ball, and the auxiliary groove of the movable part is not provided with at least one side wall or the at least one side wall of the auxiliary groove of the movable part is not contacted with the ball; specifically, the auxiliary groove of the fixed part is a V-shaped groove with a bottom edge, the ball is contacted with the bottom edge of the V-shaped groove, a gap is reserved between the ball and at least one side wall of the V-shaped groove, and the auxiliary groove of the movable part is a concave cambered surface or a plane. Wherein, the ball can roll the adjustment on the concave cambered surface.

Or, the fixed part auxiliary groove is not provided with at least one side wall, and the movable part auxiliary groove is not provided with at least one side wall. In particular, the stationary part sub-groove may be a planar or concave cambered surface and the moving part sub-groove may be a planar or concave cambered surface. Wherein, the ball can roll the adjustment on the concave cambered surface.

In particular, the concave cambered surface may be an arc surface, the radius of the arc surface is R, the radius of the ball is R, and the interrelationship is: r > R.

The beneficial effects of the utility model are as follows:

the two rows of V-shaped guide grooves in the prior art are improved into a main shaft (groove) and a secondary shaft (groove) with different cross-sectional shapes, so that the over constraint of the main reference ball guide groove of the double V-shaped grooves is eliminated, the contact between the cross section of the secondary shaft and the balls is set to be a single point contact (in most cases) between the opposite bottom surfaces and the balls, the degree of freedom in the X direction is released, and the mutual limitation and interference caused by manufacturing errors such as the mutual position degree and shape of the two V-shaped guide grooves are avoided. Has the following beneficial effects:

improvement of optical axis accuracy of vcm motor:

the main shaft is centered, the auxiliary shaft is stopped rotating, and the functions of the two shafts are differentiated. The method can reduce the influence of manufacturing errors on the optical axis movement, and the opposite single-point crimping mode is beneficial to stabilizing and improving the optical axis movement precision of the motor.

Improvement of vcm motor driving performance:

the occurrence of sliding friction caused by manufacturing errors of the V-shaped grooves is reduced, so that the balls smoothly roll in the main and auxiliary shaft guide grooves.

Motor drive hysteresis can be reduced, and jamming can be achieved.

Vcm motor cost reduction:

the stability and the precision of the motor can be improved without improving the manufacturing precision of the V-shaped guide groove by only changing the structure, and the method is beneficial to the cost reduction of the VCM motor.

Drawings

FIG. 1 is a 3D exploded perspective view of the construction of the ball VCM of examples 1-3

FIG. 2 is a 3D exploded perspective view of the construction of the ball VCM of examples 1-3

FIG. 3 is a cross-sectional view of a ball VCM of a prior art two-row guide groove with all V-grooves

FIG. 4 is a cross-sectional view of a prior art two-row groove ball VCM with all V-grooves generating position errors

FIG. 5 is an enlarged view of the ball press joint of FIG. 4

FIG. 6 is a cross-sectional view of a prior art V-groove and a planar combination of two rows of guide grooves of a ball VCM

FIG. 7 is an enlarged view of the ball press joint of FIG. 6

FIG. 8 is a sectional view of a VCM optical drive device having a sub-tank section of embodiment 1 with one arc surface and one plane

FIG. 9A is a cross-sectional view of a VCM optical drive with two flat surfaces in pressure contact with balls for the sub-groove of embodiment 2

FIG. 10 another sub-slot of embodiment 2 is a cross-sectional view of a VCM optical drive with two planes in compression with balls

FIG. 11A is a cross-sectional view of a VCM optical drive with two opposite cambered surfaces in press-contact with balls for the sub-groove of embodiment 3

FIG. 12 is a 3D exploded perspective view of the structure of the example 4-6 ball VCM optical drive

FIG. 13 is a 3D exploded perspective view of the structure of the example 4-6 ball VCM optical drive

FIG. 14 example 4A sectional view of a VCM optical drive device in which the sub-groove is a cambered surface and a flat surface is pressed against the ball

FIG. 15 example 5A sectional view of a VCM optical drive with two opposite planar faces in pressure contact with the balls

Example 6 description of the sectional view symbol of the VCM optical drive device with the sub-groove being crimped with the ball by two opposite arcuate surfaces

01 outer casing

1 fixing part

2 moving part 23 lens holding part

3 drive unit 31 coil 32 drive magnet

4 support unit

41 fixing part guide groove

411 fixed part main groove

411a fixed part main slot side wall a 411b fixed part main slot side wall b 411c fixed part main slot bottom 412 fixed part sub slot

412a fixed part sub-tank side wall a 412b fixed part sub-tank side wall b 412c fixed part sub-tank bottom surface 42 moving part guide groove

421. Main groove of moving part

421a moving member main groove side wall a 421b moving member main groove side wall b 421c moving member main groove bottom surface 422 moving member sub groove

422a moving member sub-tank side wall a 421b moving member sub-tank side wall b 421c moving member sub-tank bottom surface

43 ball

44 main groove (Main shaft)

45 auxiliary groove (auxiliary shaft)

5 detection and magnetic attraction unit

51 Hall element 52 substrate 53 detection magnet 6 plate (magnetic material)

7 base

Detailed Description

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings. However, the present utility model should be understood not to be limited to such an embodiment described below, and the technical idea of the present utility model may be implemented in combination with other known technologies or other technologies having the same functions as those of the known technologies.

In the following description of the specific embodiments, for the sake of clarity in explaining the structure and operation of the present utility model, description will be given by way of directional terms, but words of front, rear, left, right, outer, inner, outer, inner, axial, radial, etc. are words of convenience and are not to be construed as limiting terms.

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

Several embodiments of the optical drive apparatus are described below in connection with fig. 1-12.

Unless specifically stated otherwise, the appearances of the phrase "first," "second," or the like herein are not meant to be limiting as to time sequence, number, or importance, but are merely for distinguishing one technical feature from another in the present specification. Likewise, the appearances of the phrase "a" or "an" in this document are not meant to be limiting, but rather describing features that have not been apparent from the foregoing. Likewise, modifiers similar to "about" and "approximately" appearing before a number in this document generally include the number, and their specific meaning should be understood in conjunction with the context. Likewise, unless a particular quantity of a noun is to be construed as encompassing both the singular and the plural, both the singular and the plural may be included in this disclosure.

The preferred embodiments of the present utility model have been described in the specification, and the above embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the present utility model. All technical schemes which can be obtained by logic analysis, reasoning or limited experiments according to the conception of the utility model by the skilled in the art are within the scope of the utility model

For convenience in comparing and illustrating the beneficial effects of the ball guide groove structure of the present utility model, the embodiment 1, embodiment 2, embodiment 3 and the prior art all use the same VCM ball driving structure as shown in fig. 1 and 2, and for the shortcomings of the two ball guide groove structures of the prior art, fig. 3, 4, 5, 6 and 7 are used for specifically illustrating the ball guide groove structure of embodiment 1, fig. 9 and 10 are used for illustrating the ball guide groove structure of embodiment 2, and fig. 11 is used for illustrating the ball guide groove structure of embodiment 3; as another VCM ball driving structure shown in fig. 12 and 13, examples 4, 5 and 6 are adopted, and fig. 14, 15 and 16 are explanatory views of respective ball guide groove structures.

The ball guide grooves which are formed on the same side of the fixed part or the movable part and are not divided by the functions of a main shaft and a secondary shaft and are in pressure contact with the side wall of the V-shaped guide groove with two points are called main grooves, and the ball guide grooves are respectively called main grooves of the fixed part on one side of the fixed part and main grooves of the movable part on one side of the movable part; two rows of ball guide grooves separating the primary and secondary shaft functions, separately referred to as primary and secondary grooves: the fixed part side is called a fixed part main groove and a fixed part auxiliary groove, and the moving part side is called a moving part main groove and a moving part auxiliary groove. The following description of the prior art and the various embodiments will be made with the same drive structure and different ball guide structures, respectively.

< Prior Art >

The lower right corner of fig. 1 is a 3D appearance diagram of the VCM driving device. As shown in fig. 1 and 2, the device is composed of a fixed member 1, a movable member 2, a driving unit 3, a supporting unit 4, a detecting and magnetic attracting unit 5, a flat plate (magnetic material) 6, and the like. Fig. 1 and 2 show a state in which the fixed member 1 and the movable member 2 are separated, respectively. A ball 43 is provided between the fixed member 1 and the movable member 2, which is in contact with each other in a pressure-contact manner.

The movable member 2 has a lens mounting portion 21 for fixing and mounting an optical lens (not shown), and moves in the fixed member 1 along a guide groove (optical axis) formed by the fixed member guide groove 41 and the movable member guide groove 42. As an example, the moving member 2 is molded into a square cylinder shape having a square upper surface using resin.

The driving unit 3 is composed of a coil 31 attached to the fixed member 1 and connected to the substrate 52, and driving magnets 32 mounted on both sides of the moving member. The driving magnet 32 has different magnetic poles in the optical axis direction (Z-axis direction of the drawing) of the lens. An upward electromagnetic force can be applied to the moving member 2 by a current flowing through the coil 31, and a downward electromagnetic force can be applied to the moving member 2 by a current opposite thereto. That is, the current flowing through the coil 31 can be controlled to drive the movable member 2 to an arbitrary position up and down.

The detection magnetic attraction means 5 includes a detection magnet 53 provided on the moving member 2, and a hall element 51 fixed to a substrate 52. The hall element 51 and the two coils 31 are fixed to the fixing member 1 via the substrate 52, and are opposed to the driving magnet 32 and the detecting magnet 53, respectively, to form two driving units 3 and one detecting unit 5. Meanwhile, a flat plate (magnetic material) 6 is provided on the outer side of the substrate so as to face the detection magnet, and a detection magnetic attraction unit 5 (having both position detection and magnetic attraction functions) is formed.

When the position of the moving member 2 detected by the detection magnetic attraction means 5 is different from the position where the moving member 2 is to be arranged, a current can be caused to flow through the coil 31, and the moving member 2 can be moved by the driving means 3.

Fig. 2 shows a fixing member guide groove 41 of the fixing member 1, and the fixing member guide groove 41 and the moving member guide groove 42 are opposed to each other. The number of balls 43 is not 3, but may be 1 or 4 or more. The number of guide grooves of the fixed member guide groove 41 and the moving member guide groove 42 may be not 2 but 3 or more, but is preferably 2 for stable support. The following are examples of two guide grooves.

The supporting unit 4 has a fixed member guide groove 41 formed of two parallel rows of guide grooves provided on the fixed member 1, a moving member guide groove 42 provided on the moving member 2 opposite to the fixed member guide groove 41, and a ball 43 arranged between the fixed member guide groove 41 and the moving member guide groove 42. The fixing member guide groove 41 is not shown in fig. 1, but the fixing member guide groove 41 is shown in an exploded perspective view as seen from the opposite direction to fig. 1 in fig. 2.

The moving member 2 is attracted by the magnetic attraction force of the detection magnetic attraction means 5, and is supported by the fixed member 1 by pressing the fixed member guide groove 41 against the corresponding moving member guide groove 42 and the two inner rows of balls 43 against each other; the electromagnetically driven force of the driven unit 3 and the different driving directions move in the direction of the guide groove with the rolling of the balls 43.

Fig. 3 shows a ball guide groove structure of the prior art. Namely, two main shafts 44 are formed by a fixed member guide groove 41 having two rows of V-shaped guide grooves (fixed member main groove 411), a moving member guide groove 42 having two rows of V-shaped guide grooves (moving member main groove 421) corresponding thereto, and balls 43. Wherein the fixed member main slot 411 and the moving member main slot 421, which are opposite to each other, each form a row of main slots 44. That is, in fig. 3, only two identical rows of main grooves are provided without sub grooves. The main slot function is repeated. Therefore, when a manufacturing error occurs, a component force is generated between the two rows of main grooves, which affects each other, and an overconstraint is formed. In fig. 3, arrows and forces F are marked to show that the fixed member main groove 411 and the moving member main groove 421 of each row of main grooves 44 are respectively in contact with the balls in a two-point pressure contact manner by the side walls of the V grooves, and under the condition that the error is zero, the forces of the forces F are balanced, the directions of opposite resultant forces are the same and opposite, and the moving members smoothly roll along the V-shaped guide grooves of the two rows, so that no relative friction and no optical axis movement occur. The moving member 4 is movable relative to the fixed member 1 along the moving member guide groove 42 and the fixed member guide groove 41. However, when the component has manufacturing errors such as manufacturing accuracy and errors, relative positional degrees, shape of V-shaped cross section, shape errors of surface shape, and the like, the ball press-contact points of the balls 43 and the V-groove side surfaces are displaced and the applied force is changed, the magnitude and direction of each applied force F are changed, the applied position is changed, and the direction of the press-contact action of the V-groove and the balls is formed in the XY plane, so that the component force in the X direction is easily caused, and the two main shafts arranged are in the X direction, so that the two main shafts interfere and the friction force is generated; meanwhile, due to the change of the contact position of the inclined surface, the corresponding position change of the moving part correspondingly occurs in the XY axis plane, and the optical axis movement is generated. The following is an example of fig. 4 and 5.

As shown in fig. 4, when a horizontal manufacturing error occurs in the mutual positional degree of the two rows of fixing member main slots 411 of the fixing member 1. For simplicity of explanation, it is assumed that no other errors occur. In fig. 4, there is no error in the left fixing member main slot 411, and a horizontal positional error (offset) occurs in the right fixing member main slot 411 with respect to the left fixing member main slot 411, and as in the component manufacturing error (example) shown in fig. 4, the position and force of the pressing contact between the right fixing member main slot 411 and the right fixing member main slot 421 and the V-shaped guide groove formed by the balls 43 change. As shown in fig. 4 and 5, the right-side fixing member main groove 411 and the right-side moving member main groove 421 are each deviated from the original (broken line in fig. 5) position to the thick line position with the balls 43. Since the right fixing member main groove 411 of the fixing member 1 is horizontally displaced in the horizontal direction, the ball position is horizontally displaced, and the pressing force between the right moving member main groove 421 of the moving member 2 and the balls is changed accordingly, and the moving member 2 is rotated by the tilt angle of fig. 4 about the left ball guide groove (the center of the left ball 43), that is, the generated driving motor optical axis is moved. As shown in fig. 5, the contact point between the right moving member main groove 421 and the left side of the ball changes from point a' to point a, and the contact point on the right side is separated from contact with the ball by the V-groove in a non-contact state. As shown in fig. 6, the right-side moving member main groove 421 is no longer in press-contact with two points of the ball but becomes only 1-point press-contact on the 1-side. That is, since the inclined surface separation ball 43 is pressed, the upper right and lower left positions are changed, and the upper left position is separated from the other side by only one side contact, the rolling of the balls in the right fixed member main groove 411 and the moving member main groove 421 is changed, and the rolling force is applied to the balls in the one side direction, and sliding friction is generated between the balls and the left side wall of the right fixed member main groove 411. The magnitude of the arrows and the force location as in fig. 3 indicate the crimp force generation variations and imbalances.

As shown in fig. 6, another ball guide groove structure of the prior art is shown. The fixed member guide groove 41 is formed by a fixed member main groove 411 of the fixed member 1 having a V shape on the right side and a fixed member sub groove 412 of a flat shape on the left side, and the moving member guide groove 42 of the moving member 2 having two rows of V-shaped moving member main grooves 421, and the balls 43. The V groove side walls of the right side fixing member main groove 411 and the right side moving member main groove 421 are in contact with the balls in a two-point pressure contact manner (F1, F2 and F3, F4 in fig. 6); the flat surface ball single-point press-contact (F force in fig. 6) of the left side fixing member sub-groove 412, and the side wall of the left side moving member main groove 421 of the moving member 2 opposite thereto comes into two-point press-contact with the ball (F5 and F6 in fig. 6);

as shown in fig. 7, the contact surface of the left side fixed member sub-groove 412 is a single-point pressure-bonding plane, so that the restriction in the XY plane (drawing plane) of the V-shaped groove in fig. 3 and 4 is released, and the degree of freedom in the X-axis direction (horizontal direction in fig. 6) is released, and the ball is allowed to move freely in the horizontal positional error direction by being forced only in the direction indicated by the arrow F (vertical direction) on the fixed member sub-groove 412 side, so that the relative positional error of the two rows of the moving member main grooves 421 on the moving member 2 is not affected by this. However, when a shape error of the moving member main groove side wall b421b of the moving member main groove 421 on the left side of the moving member 2 in fig. 7 occurs, for example, when the moving member main groove side wall b421b changes from the broken line to the solid-thick line position, the contact position and the stress direction of the two side wall moving member main groove side walls a421a and the moving member main groove side wall b421b of the moving member main groove 421 with the balls 43 also change. The ball position moves from the nominal position where the error of the dotted line is zero to the solid line position, i.e. the ball center moves from point a' to point a. The moving part 2 thus undergoes an optical axis movement from a nominal position with zero tolerance by a corresponding tilt angle tilt. In addition, the force relationship in the XY plane between the two V-shaped main groove moving member main grooves 421 on the moving member 2 also changes from the equilibrium position where the tolerance is zero, the force components that interfere with each other are liable to interfere with each other, and the generation and change of the frictional force are caused. Drive lag and stuck are easily caused.

As described above, the ball guide groove structure of the related art including references 1, 2, and 3 is an overconstrained ball guide groove structure of a double main shaft in which the main shaft and the sub shaft of the two-row ball guide groove are not separated. The ball guide groove structure of the double main shaft is divided into two rows of ball guide groove structures with different main shafts (or called main grooves) and auxiliary shafts (auxiliary grooves), which are the key for eliminating the mutual interference and over-constraint of the two rows of ball guide grooves.

Example 1

As shown in fig. 8-1 and 8-2, the VCM driving structure of embodiment 1 is identical to the above-described prior art structure except for the ball guide groove type guide structure formed with the main groove 44 and the sub groove 45; namely, the above-described over-constrained ball guide groove structure of the prior art double spindle is divided into two rows of main grooves 44 and sub grooves 45. Wherein the main groove 44 is formed of a fixed member main groove 411 and a moving member main groove 412, and the balls 43; the sub groove 45 is formed by the fixed member sub groove 412 and the moving member sub groove 422, and the balls 43. The functions of the main groove and the auxiliary groove are separated and do not interfere with each other.

In the auxiliary shaft 45, the fixing member sub-groove 412 in fig. 8-2 includes a fixing member sub-groove side wall a412a, a fixing member sub-groove side wall b412b, and a fixing member bottom surface 412c. Wherein, the bottom surface 412c of the fixing member is a plane (the bottom surface 412 of the fixing member is a plane in fig. 8-1, no side wall is provided), and the fixing member is in single-point pressure contact with the balls 43, and is not in contact with the balls 43 with a gap; the fixed member sub-groove side wall a412a and the fixed member sub-groove side wall b412b are provided to prevent the balls 43 from coming out; the moving part auxiliary groove 422 is an arc bottom surface, the arc radius R is larger than the ball radius R, and a single point is pressed and connected to the other side of the ball 43;

As shown in left views of fig. 8-1 and 8-2, the plane of the bottom surface 412 of the fixed member and the curved surface of the sub groove 422 of the movable member are in contact with each other at a single point, and the force F is equal and opposite to the force in the Y direction, and there is no component of the interference between the main groove 44 and the sub groove 45 in the X direction, so that the main groove 44 and the sub groove 45 do not interfere in the X direction. However, the force F acts in the Y direction, and the auxiliary shaft 45 is formed.

In the main shaft 44, the fixing member main slot 411 includes: a V-shaped groove having both side walls of the fixing member main groove side wall a411a and the fixing member main groove side wall b411b and the fixing member main groove bottom surface 411 c. Wherein, the side wall a411a of the main groove of the fixed part and the side wall b411b of the main groove of the fixed part are respectively pressed and contacted with the two points of the ball 43, and the bottom surface 411c of the main groove of the fixed part is not contacted with the ball; the moving member main groove 421 includes: the two side walls of the moving member main groove side wall a421a and the moving member main groove side wall b421b and the V-shaped groove of the moving member main groove bottom surface 421 c. Wherein the bottom surface 421c of the main groove of the moving member is not in contact with the balls; as shown in the left side of fig. 8, an equilibrium pressing force F is generated for 4 pressing points in total between two points on the fixed member main groove 411 side and two points on the movable member main groove 421 side with respect to the ball 43. The centre of the ball is thus located in the main groove 44, forming the main shaft 44.

As shown in fig. 8-1 and 8-2, when manufacturing errors such as a main shaft and a sub shaft positional error occur, the sub shaft 45 fixing member 1 side is a plane, and is therefore not affected by the positional error in the X direction. Further, since only a single point of the arc in the Y direction and the plane is pressed, when the position of the ball 43 is deviated from the arc apex position in the XY plane, the resultant force of the acting force of the deviated position and the attractive force of the detection magnetic attraction means always points to the ball 43 and the arc apex of the arc, and there is no restriction component force in the X direction formed by the V-groove side surface, and the ball can be freely moved in place. Therefore, the mutual component force interference in the X direction is not generated as in the prior art, and the friction resistance which influences the driving due to the change of the acting force direction and the acting point is not easily generated. The method is not easy to be influenced by manufacturing errors (such as position degree and shape precision) of the main groove and the auxiliary groove to generate similar optical axis deviation, and is not easy to generate friction force to cause driving hysteresis and clamping, so that the method is insensitive to the manufacturing errors and is convenient for manufacturing of common error precision. However, when the attractive force of the magnetic attraction unit 5 and the frictional force of the balls with the plane and the arc surface of the sub-groove are detected to be equal, the balls 43 may deviate from the arc apex and stop at that position due to manufacturing errors and attractive force and frictional force of the contact surface of the balls 43 with the sub-groove 45 with respect to the arc surface of the moving member sub-groove 412 of the moving member 2. At this time, a certain optical axis offset α is caused by the rise of the cambered surface of the ball stop position. In this case, the positional error Δ and the optical axis offset α of the motor product, and the relationship between the arc radius R and the distance L between the ball half jin R and the main groove and the sub groove are managed according to the optical axis offset α requirement as follows, and the optical axis offset accuracy can be ensured.

Example 2

As shown in fig. 9, the VCM driving structure of embodiment 2 is identical to that of embodiment 1, and a main groove 44 and a sub groove 45 are also provided. The difference is that the ball guide groove mode of the sub groove 45 has a slightly different guide structure; wherein, the liquid crystal display device comprises a liquid crystal display device,

the fixing member sub-groove 412 of the sub-shaft 45 includes a fixing member sub-groove side wall a412a, a fixing member sub-groove side wall b412b, and a fixing member bottom surface 412c. Wherein, the bottom surface 412c of the fixing member is a plane, and is in single-point pressure contact with the ball 43, and is not contacted with the ball 43 with a gap; the fixed member sub-groove side wall a412a and the fixed member sub-groove side wall b412b are provided to prevent the balls 43 from coming out;

the moving member sub groove 422 of the sub shaft 45 includes a moving member sub groove side wall a422a, a moving member sub groove side wall b422b, and a moving member bottom surface 422c. Wherein the bottom surface 422c of the moving member is also a plane, is in single-point press contact with the balls 43, and has a gap with the balls 43, and at least one side wall is not in contact with the balls 43; the moving member sub-groove side walls a422a and the moving member sub-groove side walls b422b are provided to prevent the balls 43 from coming out, and are not easily brought into contact with the balls, so that friction is not easily generated;

as shown in fig. 9, the pressing force of the single point contact between the fixed member bottom surface 412c and the moving member bottom surface 422c and the balls 43 is such that two forces F having equal magnitudes and opposite directions are generated in the Y direction, and the forces do not have a component force in the X axis direction, so that the interference force between the main groove 44 and the sub groove 45 in the X direction is not generated.

Two side surfaces of the fixing part main slot 411 provided on the fixing part 1 are respectively in pressure contact with two points of the ball 43; a moving member main groove 421 provided in the moving member 2, the other side of the ball 43 being pressed at two points opposite to the fixed member main groove 411 by two sides; the opposing ball 43 is 4 balanced crimping forces F at two points on each side.

In embodiment 2, when the error in the X-direction positional degree of the main groove 44 and the sub groove 45 occurs, the balls 43 are not easily contacted with the respective blocking surfaces due to the clearance between the both sides of the balls 43, and friction between the balls 43 and the side surfaces is not easily generated. Further, since only the plane in the Y direction is pressed at a single point, interference of the component forces in the X direction is not easily generated. Thus, the balls 43 can roll in the guide grooves smoothly, and friction force is not easily generated due to the change of the acting force direction and the acting point. That is, the optical axis-like offset is not easily generated due to the influence of the position degree and the shape precision of the main groove and the auxiliary groove, and the driving hysteresis and the clamping on are not easily generated due to the friction force, so that the embodiment is insensitive to the manufacturing error and is convenient for manufacturing with common error precision.

Fig. 10 is an explanatory view of the bottom surfaces of the other auxiliary shaft 45 of embodiment 2, which are in press contact with the balls 43, in a plane. As shown in fig. 10, the bottom surface of the fixing member sub-groove 412 is flat, and no blocking surface is provided on both sides.

The moving member sub groove 422 of the moving member 2 includes a moving member sub groove side wall a422a, a moving member sub groove side wall b422b, and a moving member bottom surface 422c. Wherein the bottom surface 422c of the moving member is also a plane, and is in single-point press-contact with the balls 43, and at least one side wall of the moving member and the balls 43 are kept in clearance and are not contacted with each other; the moving member sub-groove side walls a422a and the moving member sub-groove side walls b422b are provided to prevent the balls 43 from coming out, and are not easily brought into contact with the balls, so that friction is not easily generated;

as shown in fig. 10, the opposing ball 43 is a press-contact of two opposing points of the ball 43 with both the fixed member bottom surface 412c and the moving member bottom surface 422c, which are planar, and the force is balanced by forming two forces F in the Y direction, which are equal and opposite to each other, and the force does not have a component force in the X axis direction, so that the force does not form the interference force between the main groove 44 and the sub groove 45 in the X direction.

Example 3

Fig. 11 is an explanatory view of embodiment 3, and as shown in fig. 11, the VCM driving structure of embodiment 3 is identical to the structures of embodiment 1 and embodiment 2, and a main groove 44 and a sub groove 45 are also provided. The difference is that the ball guide way of the sub groove 45 has a slightly different guiding structure. The auxiliary shaft 45 is composed of a fixed member auxiliary groove 412 having an arc surface, a movable member auxiliary groove 422 having an arc surface, and the balls 43.

The fixing member sub-groove 412 is a bottom surface of an arc, preferably, the arc is an arc, the radius R of which is larger than the radius R of the ball, and a single point is pressed against one side of the ball 43;

the moving part sub groove 422 is a bottom surface of an arc, preferably, the arc is an arc, the arc radius R of the arc is larger than the radius R of the ball, and a single point is pressed on the other side of the ball 43;

the difference from embodiment 2 is that the ball 43 is crimped with two opposing arcs R. But is also a single point crimp in opposite directions. Therefore, since only a single point of the arc in the Y direction and the plane is pressed, when the position of the ball 43 is deviated from the arc apex position in the XY plane, the resultant force of the acting force of the deviated position and the attractive force of the detection magnetic attraction means always points to the ball 43 and the arc apex, and there is no restriction component force in the X direction formed by the V-groove side surface, and the ball can be freely moved in place. Therefore, the mutual component force interference in the X direction is not generated as in the prior art, and the friction resistance which influences the driving due to the change of the acting force direction and the acting point is not easily generated. The method is not easy to be influenced by manufacturing errors (such as position degree and shape precision) of the main groove and the auxiliary groove to generate similar optical axis deviation, and is not easy to generate friction force to cause driving hysteresis and clamping, so that the method is insensitive to the manufacturing errors and is convenient for manufacturing of common error precision.

Preferably, when the circular arc position, such as the positions of the fixed part main slot 411 and the fixed part sub slot 412 of the fixed part guide slot 41 and the moving part main slot 421 and the fixed part sub slot 422 of the moving part guide slot 42, is changed in the X direction, there is a shift of the optical axis due to the change of the fitting position caused by the circular arc height, such as the relation between the position error delta and the optical axis offset alpha of the motor product, the circular arc radius R and the ball half jin R, and the distance L of the main slot and the sub slot, is relatively easy to control as follows,

optical axis offset.

Fig. 12 to 16 are explanatory views of modifications of examples 4 to 6 of the structure of reference 2 of the related art. Basically, the present utility model is similar to the foregoing embodiments 1, 2 and 3, and the detailed description thereof will be omitted by referring to the drawings.

The optical driving device of the present utility model includes, but is not limited to, an auto focus AF driving device, an OS anti-shake driving device, an optical zoom device, and the like. The electromechanical conversion method described in this patent includes, but is not limited to, VCM magnet coil method, piezoelectric driving method, memory alloy SMA method, and the like.

Claims

1. An optical driving apparatus driven by an electromechanical conversion member, comprising:

The fixing part is arranged on the upper surface of the fixing part,

the moving part is provided with a plurality of moving parts,

comprising a driving part respectively arranged on the fixed part and the moving part,

a magnetic attraction unit including a magnetic attraction body;

the fixed part and the moving part are respectively provided with a row of main shaft guide grooves and at least one row of auxiliary shaft guide grooves, and the main shaft guide grooves, the auxiliary shaft guide grooves and balls between the main shaft guide grooves and the auxiliary shaft guide grooves form a supporting unit;

the main shaft guide groove on the fixed part is a main groove of the fixed part, the main shaft guide groove on the movable part is a main groove of the movable part, the auxiliary shaft guide groove on the fixed part is an auxiliary groove of the fixed part, and the amplitude shaft guide groove on the movable part is an auxiliary groove of the movable part;

the fixed part and the moving part are in pressure connection through the balls;

it is characterized in that the method comprises the steps of,

a gap is reserved between at least one side wall of the auxiliary groove of the fixed part and the ball, and a gap is reserved between at least one side wall of the auxiliary groove of the movable part and the ball;

or, the fixed part auxiliary groove is not provided with at least one side wall or at least one side wall of the fixed part auxiliary groove is not contacted with the balls, and a gap is reserved between at least one side wall of the movable part auxiliary groove and the balls;

Or, a gap is reserved between at least one side wall of the auxiliary groove of the fixed part and the ball, and the auxiliary groove of the movable part is not provided with at least one side wall or the at least one side wall of the auxiliary groove of the movable part is not contacted with the ball;

or, the fixed part auxiliary groove is not provided with at least one side wall, and the movable part auxiliary groove is not provided with at least one side wall.

2. The optical driving device according to claim 1, wherein the fixed member main groove and the moving member main groove are V-shaped grooves having a bottom edge or a non-bottom edge, and limit two points on the surface of the ball respectively; when the main groove is a V-shaped groove with a bottom edge, the balls are not contacted with the bottom edge of the V-shaped groove of the main groove of the moving part.

3. An optical drive apparatus according to claim 1 or 2, wherein the fixed member sub-groove is not provided with at least one side wall, and the moving member sub-groove is not provided with at least one side wall, specifically: one of the fixed part auxiliary groove and the moving part auxiliary groove is set to be a concave cambered surface or a plane, and the other is also set to be a plane or a concave cambered surface.

4. An optical drive apparatus according to claim 1 or 2, wherein the fixed member sub-groove is not provided with at least one side wall or at least one side wall of the fixed member sub-groove is not in contact with the balls, a gap is left between at least one side wall of the moving member sub-groove and the balls, specifically, the fixed member sub-groove is provided with a concave arc surface or plane, the moving member sub-groove is provided with a V-shaped groove having a bottom edge, and the balls are in contact with the bottom edge of the V-shaped groove, and a gap is left between the balls and at least one side wall of the V-shaped groove.

5. An optical drive apparatus according to claim 1 or 2, wherein a gap is left between at least one side wall of the stationary member sub-groove and the balls, the moving member sub-groove is not provided with at least one side wall or at least one side wall of the moving member sub-groove is not in contact with the balls, specifically, the moving member sub-groove is provided with a concave arc surface or plane, the stationary member sub-groove is provided with a V-shaped groove having a bottom edge, and the balls are in contact with the bottom edge of the V-shaped groove, and the balls are in gap with at least one side wall of the V-shaped groove.

6. An optical drive apparatus according to claim 1 or 2, wherein a gap is left between at least one side wall of the stationary member sub-groove and the ball, a gap is left between at least one side wall of the moving member sub-groove and the ball, and specifically, the stationary member sub-groove and the moving member sub-groove are each provided as a V-shaped groove having a bottom edge, the ball is in contact with the bottom edge of the V-shaped groove, and the ball is in gap with at least one side wall of the V-shaped groove.

7. An optical drive as claimed in claim 3, wherein said ball is adapted to roll on said concave arcuate surface, said ball being in single point compression contact with said concave arcuate surface.

8. An optical drive as defined in claim 4, wherein said ball is capable of rolling adjustment on said concave arcuate surface, said ball being in single point compression contact with said concave arcuate surface.

9. An optical drive apparatus according to claim 3, wherein the concave cambered surface is a circular arc surface, the radius of the circular arc surface is R, the radius of the ball is R, and the relationship is: r > R.

10. An optical drive as claimed in claim 4, wherein said concave arcuate surface is a circular arc

The radius of the arc surface is R, the radius of the ball is R, and the interrelationship is: r > R.

11. An optical drive as claimed in claim 1, wherein the number of balls in the spindle guide is at least 2 or 3; the number of balls in the layshaft is single or multiple.

12. An optical drive apparatus according to claim 1, wherein said moving member is supported by said main shaft guide groove and said sub shaft guide groove and driven by said driving member to move back and forth in the directions of said main shaft guide groove and said sub shaft guide groove with respect to said fixing member.

13. An optical drive as claimed in claim 1, further comprising a detection unit, said detection unit being adapted to open and closed loop requirements, comprising: the base plate is arranged on the Hall element and used for fixing the Hall element.

14. An optical drive apparatus according to claim 1, wherein said drive member is one, provided on a side adjacent to said magnetic attraction unit; or, the driving members are provided in a pair, and are provided on the sides adjacent to the magnetic attraction units.