CN119343618A - Lens drive unit - Google Patents
Lens drive unit Download PDFInfo
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- CN119343618A CN119343618A CN202380009248.1A CN202380009248A CN119343618A CN 119343618 A CN119343618 A CN 119343618A CN 202380009248 A CN202380009248 A CN 202380009248A CN 119343618 A CN119343618 A CN 119343618A
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- Prior art keywords
- lens
- driving unit
- holding portion
- support shaft
- lens driving
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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
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
A lens driving unit (1) is provided with a lens holding part (2) for holding at least one lens (R), a support shaft (3) for supporting the lens holding part (2) so as to be movable in a first direction (D1) which is the extending direction of an optical axis (C) of the lens (R), an actuator (4) having a drive shaft (41) which extends in the first direction (D1) and vibrates in the first direction (D1), and a base (51) to which the support shaft (3) and the actuator (4) are fixed, wherein the lens holding part (2) has a first engagement part (21), and the first engagement part (21) has a pair of friction surfaces (211) for sandwiching the drive shaft (41), so that the application of a load to the actuator (4) can be avoided.
Description
The present invention relates to a lens driving unit that drives a lens in an optical axis direction.
Conventionally, a lens driving unit is known that includes a small actuator using a piezoelectric element that expands and contracts in a predetermined direction, and drives a lens in an optical axis direction (see japanese patent application laid-open No. 2015-105988).
As shown in fig. 8 and 9, the lens driving unit 100 includes a device main body 101, an actuator 104 held by the device main body 101, and a moving member 105 driven by the actuator 104.
The apparatus main body 101 includes a holding member 102 and a cover 103, the holding member 102 includes an actuator holding portion 121 for holding the actuator 104 in a first corner portion 102a, and a third support column 120c is provided in a third corner portion 102c disposed at a diagonal position of the first corner portion 102 a. The third support column 120c has a regulating portion receiving groove 122 into which a part (rotation regulating portion) 161 of the moving member 105 is movably fitted in the up-down direction.
The actuator 104 includes a piezoelectric element 141 that expands and contracts in a predetermined direction, and a drive shaft 142 that is coupled to one end of the piezoelectric element 141.
The moving member 105 includes a substantially cylindrical moving member body 106 and an engaging member 107 engaged with the drive shaft 142 with a predetermined friction force.
The moving member body 106 holds at least one lens on the inner peripheral side, and has a rotation restricting portion 161 on the outer periphery, and the rotation restricting portion 161 protrudes in the radial direction of the lens and restricts rotation of the moving member 105 relative to the drive shaft 142.
The engaging member 107 includes a metallic elastic band-shaped engaging member body 171 and a metallic elastic band-shaped elastic body 173.
The engaging member main body 171 includes a drive bearing portion 172 at one end in the longitudinal direction, and the drive bearing portion 172 includes a first receiving portion 172a and a second receiving portion 172b extending substantially in the right-angle direction from the first receiving portion 172 a.
The elastic body 173 includes a pressing portion 173a at one end in the longitudinal direction, and the pressing portion 173a presses the drive shaft 142 to the drive bearing portion 172. The drive shaft 142 is sandwiched between the drive bearing portion 172 and the pressing portion 173a of the engagement member 107 connected to the moving member body portion 106. Thereby, the engaging member 107 is engaged with the drive shaft 142 slidably in the axial direction.
In the lens driving unit 100 configured as described above, when power is supplied to the piezoelectric element 141 from a driving circuit provided in a mobile terminal or the like, the piezoelectric element 141 vibrates in the axial direction and the driving shaft 142 reciprocates by its vibration (expansion/contraction), and the moving member 105 moves in the axial direction (optical axis direction) of the driving shaft 142 by its reciprocation.
However, in the lens driving unit 100, since the moving member 105 holding at least one lens is configured to reciprocate in the axial direction (optical axis direction) of the drive shaft 142 in a state supported only by the actuator 104, that is, a structure in which the weight of the lens, the moving member 105, and the like is applied to the actuator 104 in total, the actuator 104 may be damaged when a mobile phone or the like on which the lens driving unit 100 is mounted is impacted.
Prior art literature
Patent document 1
Japanese patent application laid-open No. 2015-105988.
Disclosure of Invention
Problems to be solved by the invention
Accordingly, an object of the present invention is to provide a lens driving unit that is difficult to apply a load to an actuator.
Solution for solving the problem
The lens driving unit according to the present invention has:
A lens holding unit that holds at least one lens;
A support shaft that supports the lens holding portion in a first direction, which is an optical axis direction of the lens, so as to be movable;
an actuator having a drive shaft extending in a first direction and vibrating in the first direction, and
A base to which the support shaft and the actuator are fixed,
The lens holding portion has a first engaging portion having a pair of friction surfaces sandwiching the drive shaft.
In the lens driving unit,
The actuator has a piezoelectric element that is connected to one end of the drive shaft and that reciprocates the drive shaft in the first direction by telescoping in the first direction.
In addition, in the lens driving unit,
The support shaft may also magnetically support the lens holding portion so as to be movable in the first direction.
In addition, in the lens driving unit,
The support shaft extends in the first direction and is formed of a magnet,
The lens holding portion may further have a second engaging portion engaged with the support shaft,
The second engagement portion may further include:
A penetration hole penetrating along the first direction and penetrating the support shaft, and
And a magnet disposed to press an inner peripheral surface of the insertion hole against the support shaft in a second direction orthogonal to the first direction.
In addition, in the lens driving unit,
The lens holder has a holder body surrounding a periphery of the at least one lens,
The first engagement portion and the second engagement portion may be disposed on both sides of the holding portion main body in the radial direction of the lens when viewed from the first direction.
In addition, in the lens driving unit,
The pair of friction surfaces may also be respectively expanded along a surface direction orthogonal to a third direction orthogonal to the first direction and the second direction and sandwich the drive shaft in the third direction.
In addition, in the lens driving unit,
The lens holding portion includes:
a holding part body surrounding the periphery of the at least one lens, and
A plurality of extension portions spaced apart in the first direction and extending from the holder body,
The plurality of extension portions may have the insertion hole at positions overlapping each other when viewed from the first direction.
In addition, in the lens driving unit,
The lens holding portion includes:
a holding part body surrounding the periphery of the at least one lens, and
A pair of extension portions spaced in the first direction and extending from the holder body,
The pair of extending portions are included in the second engaging portion, are movable in the first direction relative to the support shaft, and are engaged with the support shaft,
The center of gravity of the lens holding portion in a state where the at least one lens is held may also be located between the pair of extension portions in the first direction.
In addition, the lens driving unit is provided with a lens driving unit,
A cover member may be provided that forms a housing with the base.
In addition, in the lens driving unit,
In the support shaft, a portion on one side in the first direction of the engagement portion of the second engagement portion may be fixed to the base, and a portion on the other side in the first direction of the engagement portion of the second engagement portion may be fixed to the cover member.
In addition, in the lens driving unit,
The first engagement portion may be formed by bending a band-plate-shaped metal member into a predetermined shape.
In addition, in the lens driving unit,
The pair of friction surfaces may be included on the surface of the band-plate-shaped metal member.
In addition, in the lens driving unit,
The force of the pair of friction surfaces sandwiching the drive shaft may also be generated by elasticity of the band-plate-like metal member.
Fig. 1 is a perspective view of a lens driving unit according to the present embodiment.
Fig. 2 is an exploded perspective view of the lens driving unit.
Fig. 3 is a perspective view of the lens driving unit in a state in which the cover member is removed.
Fig. 4 is a view of the lens driving unit when the cover member is detached from the lens driving unit as viewed in the optical axis direction.
Fig. 5 is a cross-sectional view of the V-V line position of fig. 4.
Fig. 6 is a cross-sectional view of the support shaft and its periphery at the VI-VI line position in fig. 4.
Fig. 7 is a diagram for explaining the magnetic force required for the support magnet.
Fig. 8 is an exploded perspective view of a conventional lens driving unit.
Fig. 9 is a view of a cross section of a part of the conventional lens driving unit as viewed from the optical axis direction.
An embodiment of the present invention is described below with reference to the drawings.
The lens driving unit of the present embodiment may be built in a mobile terminal such as a smart phone, for driving a lens or a lens group in an optical axis direction and focusing (i.e., performing auto focusing) in a camera of the mobile terminal.
As shown in fig. 1 to 6, the lens driving unit 1 includes a lens holding portion 2 that holds at least one lens R, a support shaft 3 that supports the lens holding portion 2 so as to be movable in an extending direction (optical axis direction (first direction)) D1 of an optical axis C of the lens R, and an actuator 4 that drives the lens holding portion 2 in the optical axis direction D1. The lens driving unit 1 includes a housing 5 that encloses the lens holding portion 2, the support shaft 3, and the actuator 4, and a substrate portion 6 for controlling the actuator 4 disposed in the housing 5.
The support shaft 3 supports the lens holding portion 2 by magnetic force so as to be movable in the optical axis direction D1. Specifically, the support shaft 3 is a member extending in the optical axis direction D1, and is formed of a magnet (in detail, a ferromagnetic body) such as iron. The support shaft 3 of the present embodiment is a cylindrical member extending in the optical axis direction D1, and has the same outer diameter at each position in the optical axis direction D1.
The actuator 4 is a so-called piezoelectric actuator having a piezoelectric element 42, and the actuator 4 of the present embodiment is a Smooth-impact drive mechanism (Smooth IMPACT DRIVE MECHANSIM: SIDM).
Specifically, the actuator 4 includes a drive shaft 41 extending in the optical axis direction D1, and a piezoelectric element 42 connected to one end of the drive shaft 41 and extending and contracting in the optical axis direction D1. In addition, the actuator 4 has a weight portion (weight member) 43 connected to the opposite side of the drive shaft 41 of the piezoelectric element 42.
The drive shaft 41 of the present embodiment is a cylindrical shaft member extending in the optical axis direction D1. The piezoelectric element 42 is an element that converts input electric energy into mechanical energy that expands and contracts, that is, mechanical motion, and for example, converts input electric energy into mechanical expansion and contraction motion by a piezoelectric effect. The piezoelectric element 42 reciprocates the drive shaft 41 in the optical axis direction D1 by the telescopic motion. The drive shafts and piezoelectric elements 42 are connected by an adhesive. The weight 43 is configured to generate displacement by expansion and contraction of the piezoelectric element 42 only on the drive shaft 41 side.
The housing 5 has a base 51 to which the support shaft 3 and the actuator 4 are fixed, and a cover member 52 that constitutes the housing 5 together with the base 51. The case 5 of the present embodiment has a substantially rectangular parallelepiped shape, and has a substantially square shape when viewed from the optical axis direction D1.
The base 51 extends in a direction perpendicular to the optical axis direction D1, and has a first optical path opening 511 penetrating in the optical axis direction D1 in a central portion. The base 51 has a first holding portion 512 for holding the support shaft 3, and a second holding portion 513 for holding the actuator 4. The first holding portion 512 and the second holding portion 513 are disposed at two corners (first corner 51a, second corner 51 b) facing a predetermined diagonal direction (second direction) D2 of the base 51 when viewed from the optical axis direction D1.
The first holding portion 512 of the present embodiment is a through hole penetrating in the optical axis direction D1, and the support shaft 3 is fixed to the first holding portion (through hole) 512 in a state where one end of the support shaft 3 is inserted (refer to fig. 6). The second holding portion 513 of the present embodiment is also a through hole penetrating in the optical axis direction D1, and the actuator 4 (weight 43) is fixed to the second holding portion 513 in a state where the weight 43 of the actuator 4 is inserted (see fig. 5).
The cover member 52 includes a plate-like portion 521 extending in a direction perpendicular to the optical axis direction D1, and a peripheral wall portion 522 extending from a peripheral edge of the plate-like portion 521 toward the base 51. The plate-like portion 521 has a first optical path opening 523 penetrating in the optical axis direction D1 in a central portion. The plate-like portion 521 includes a cover-side holding portion 524 and a through hole 525 that penetrates in the optical axis direction D1 at positions corresponding to the first holding portion 512 and the second holding portion 513 of the base 51. The drive shaft 41 (specifically, the tip end portion of the drive shaft 41) of the actuator 4 is inserted into the through hole 525 and can reciprocate (vibrate) in the optical axis direction D1. The cover-side holding portion 524 of the present embodiment is a through hole penetrating in the optical axis direction D1, and the support shaft 3 is fixed to the cover-side holding portion 524 with the other end of the support shaft 3 inserted.
The lens holding portion 2 includes a holding portion main body 20 for holding the lens R or the lens group (lens), a first engaging portion 21 engaged with the actuator 4, and a second engaging portion 22 engaged with the support shaft 3. The lens holder 2 further includes a detection magnet 23 for detecting a position or a movement amount of the lens holder 2 in the optical axis direction D1.
The holder body 20 is a tubular or frame-like member that holds the lens R or the lens group so as to surround the lens R or the lens group (lens). The holding portion main body 20 of the present embodiment is made of resin, and holds one lens R. Further, when the holding portion main body 20 holds a lens group including a plurality of lenses R, each lens R is held so that the respective optical axes C are kept uniform.
The first engagement portion 21 has a pair of friction surfaces 211 (see fig. 5) for sandwiching the drive shaft 41 of the actuator 4, and is disposed at one end of the holding portion main body 20 in a predetermined diagonal direction D2 that is a direction connecting the first corner 51a and the second corner 51b of the base 51 (specifically, a direction connecting the support shaft 3 and the actuator 4). The first engaging portion 21 of the present embodiment is formed by bending a metal band plate-like member into a predetermined shape.
The pair of friction surfaces 211 of the first engaging portion 21 extend in a surface direction orthogonal to the holding direction (third direction) D3, and hold the drive shaft 41 in the holding direction, the holding direction (third direction) D3 being orthogonal to the optical axis direction D1 and the diagonal direction D2, respectively. The clamping force of the pair of friction surfaces 211 against the drive shaft 41 is a force generated by the elastic force (elasticity) of the first engagement portion 21 (the metal band plate-like member), and is set so as to act a predetermined friction force against the drive shaft 41.
The second engagement portion 22 includes an insertion portion 220 penetrating in the direction of the optical axis direction D1 and into which the support shaft 3 is inserted, and a support magnet 225 for applying a magnetic attraction force to the support shaft 3, and is disposed at the other end of the holding portion main body 20 in the diagonal direction D2.
The insertion portion 220 has a plurality of extension portions (extens ion member) 221 extending from the holding portion body 20 to the other side (direction away from the holding portion body 20) in the diagonal direction D2, respectively. The plurality of extension portions 221 are spaced apart in the optical axis direction D1 and extend from the holding portion main body 20. In the insertion portion 220 of the present embodiment, a pair of extension portions 221 are spaced apart in the optical axis direction D1 and extend from the holding portion main body 20.
The extension portions 221 are plate-like portions extending in a plane direction orthogonal to the optical axis direction D1, and are arranged at intervals along the optical axis direction D1. The extension parts 221 of the present embodiment are arranged at intervals in the optical axis direction D1 such that the center of gravity G of the lens holding part 2 in the state where the lens R is held is located at an arbitrary position between the pair of extension parts 221 in the optical axis direction D1, see fig. 7.
Each extension 221 has a through hole (insertion hole) 222 penetrating in the optical axis direction D1 at a position overlapping when viewed from the optical axis direction D1. The through holes 222 of the present embodiment are circular holes, and the inner diameter of each through hole 222 is slightly larger than or the same as the outer diameter of the support shaft 3.
The support magnets 225 are disposed at positions along the diagonal direction D2 to press the inner peripheral surfaces 223 of the through holes (insertion holes) 222 of the extension portions 221 against the support shaft 3. Specifically, the support magnet 225 is disposed at a position on the other side (right side in fig. 6) of the support shaft 3 in the diagonal direction D2. More specifically, the support magnet 225 is disposed at a position on the other side of each extension 221 in the diagonal direction D2. The support magnet 225 has magnetic poles arranged in the diagonal direction D2 and extends from the position of one extension 221 to the position of the other extension 221 in the optical axis direction D1.
The strength of the support magnet 225 (strength of the magnetic attraction force) is set so that the lens holding portion 2 in a state where the lens R is held does not shake (tilt) with respect to the support shaft 3 when the lens driving unit 1 is arranged so that the optical axis direction D1 coincides with the vertical direction. The lens driving unit 1 of the present embodiment is described below.
As shown in fig. 7, the distance from the center of gravity G of the lens holding portion 2 in the state where the lens R is held to the axial center of the support shaft 3 is L1, the distance from the center of gravity G of the support shaft 3 in the optical axis direction D1 to the contact position (the center position of the dimension of the inner peripheral surface 223 in the optical axis direction D1 in fig. 7) α1, α2 of the inner peripheral surface 223 of each extension 221 is L2, the force (gravity) applied to the center of gravity G is F1, and the force from the magnetic attraction force of the support magnet 225 is F2. The contact point α1 is regarded as a contact position at the time of the ascent described later, and the contact point α2 is regarded as a contact position at the time of the ascent described later.
In the present embodiment, when the axial direction of the support shaft 3 is aligned with the vertical direction and the direction in which the lens holder 2 is away from the base 51 is the upper side (the posture shown in fig. 7) is the upright state, and when the direction in which the lens holder 2 is away from the base 51 is the lower side) is the upright state, and the direction in which the axis of the support shaft 3 is aligned with the horizontal direction and the direction in which the lens holder 2 is located at the lower side with respect to the support shaft 3 is the upright state, the following relationship holds:
when standing upright: l1×f1=l2 x F2. (1)
When the device is upside down, l1×f1=l2× F2.. (2)
At level: f1= F2. (3)
In the lens driving unit 1 of the present embodiment, l1=7.5 mm, l2=1.5 mm, and the self weight of the lens holding portion 2 in the state where the lens R is held is 1.5g, then,
F1=mfg=1.5fg=15mN
Thus, it is possible to obtain:
according to (1) above, f2=75mn
According to (2) above, f2=75mn
According to (3) above, f2=15mn
If the safety factor is set to 2,
F2=150mN=15gf
In summary, the magnetic attraction force of the supporting magnet 225 is set to 15gf. In the above calculation, the engagement of the first engagement portion 21 of the lens holding portion 2 with the actuator 4 is not considered, and the lens holding portion 2 in the state where the lens R is held is supported only by the support shaft 3.
Returning to fig. 1 to 6, the detection magnet 23 is disposed on the peripheral surface of the holding unit body 20. The detection magnet 23 of the present embodiment is disposed at a position facing the substrate portion 6 on the peripheral surface of the holding portion main body 20 (see fig. 4).
The substrate portion 6 includes a circuit portion 61 for supplying power to the piezoelectric element 42 of the actuator 4, and a position sensor 62 for detecting the position or the movement amount of the lens holder 2 in the optical axis direction D1. The position sensor 62 of the present embodiment is a hall element.
In the lens driving unit 1 configured as described above, when power is supplied from the circuit portion 61 to the piezoelectric element 42 in the actuator 4, the piezoelectric element 42 vibrates (expands and contracts) in the optical axis direction D1, and the vibration drive shaft 41 reciprocates in the optical axis direction D1, so that the lens holding portion 2 moves in the axial direction (optical axis direction D1) of the drive shaft 41 by its reciprocation. Thus, the lens R in the camera of the mobile terminal such as the smart phone incorporating the lens driving unit 1 moves in the optical axis direction D1, and performs auto-focusing.
More specifically, by applying a rectangular wave of a predetermined duty ratio to the piezoelectric element 42, the displacement of the drive shaft 41 becomes triangular, and by changing the duty ratio of the rectangular wave, triangular waves having different inclinations are generated at the time of rising and falling of the amplitude. The drive mechanism of the actuator 4 also takes advantage of this.
For example, by slowly moving the driving shaft 41 in the extension direction of the piezoelectric element 42, the lens holding portion 2 engaged with the driving shaft 41 by the pair of friction surfaces 211 also moves in accordance with the movement in the extension direction, and when the driving shaft 41 is moved in the contraction direction of the piezoelectric element 42 at the instant when the static friction force between the pair of friction surfaces 211 and the driving shaft 41 is exceeded, the lens holding portion 2 is held at the original position by the inertial force. By repeating the reciprocating motion in the axial direction of the drive shaft 41 in this way, the lens holding portion 2 is moved in the axial direction (optical axis direction D1) of the drive shaft 41.
The above lens driving unit 1 has the lens holding portion 2 that holds at least one lens R, the support shaft 3 that supports the lens holding portion 2 so as to be movable in the optical axis direction (first direction) D1 of the lens R, the actuator 4 that has the drive shaft 41 that extends in the optical axis direction D1 and vibrates in the optical axis direction D1, and the base 51 to which the support shaft 3 and the actuator 4 are fixed. The lens holder 2 has a pair of friction surfaces 211 that sandwich the drive shaft 41.
In this way, in a state where the support shaft 3 supports the lens holding portion 2 so as to be movable in the optical axis direction D1, the actuator 4 supplies a driving force for moving the lens holding portion 2 in the optical axis direction D1, and by such a structure, it is possible to suppress the application of a load due to the weight or the like of the lens R or the lens holding portion 2 to the actuator 4. That is, it is difficult to apply a load to the actuator 4.
In the lens driving unit 1 of the present embodiment, the actuator 4 includes a piezoelectric element 42, and the piezoelectric element 42 is connected to one end of the driving shaft 41 and reciprocates the driving shaft 41 in the optical axis direction D1 by expanding and contracting in the optical axis direction (first direction) D1.
In the lens driving unit 1 of the present embodiment, the support shaft 3 supports the lens holding portion 2 by magnetic force so as to be movable in the optical axis direction D1.
According to this structure, by adjusting the magnitude of the magnetic force, it is easy to realize a structure in which the position of the lens holding portion 2 in the optical axis direction with respect to the support shaft 3 is fixed when the driving force from the actuator 4 is not applied to the lens holding portion 2, and movement of the lens holding portion 2 in the optical axis direction D1 with respect to the support shaft 3 is allowed when the driving force from the actuator 4 is applied to the lens holding portion 2.
In the lens driving unit 1 of the present embodiment, the support shaft 3 is formed of a magnet, and the lens holding portion 2 includes a second engaging portion 22 that engages with the support shaft 3.
In the lens driving unit 1 of the present embodiment, the second engaging portion 22 includes a through hole (insertion hole) 222 penetrating in the optical axis direction (first direction) D1 and through which the support shaft 3 is inserted, and a support magnet (magnet) 225 disposed at a position pressing the inner peripheral surface 223 of the through hole 222 in the diagonal direction (second direction) D2 with respect to the support shaft 3.
In this way, by utilizing the magnetic force of the support magnet 225, a structure in which the support shaft 3 supports the lens holding portion 2 so as to be movable in the optical axis direction D1 can be easily realized.
In the lens driving unit 1 of the present embodiment, the lens holding portion 2 includes a holding portion main body 20 surrounding the periphery of the lens R, and the first engaging portion 21 and the second engaging portion 22 are disposed on both sides of the holding portion main body 20 in a predetermined radial direction (in the example of the present embodiment, in the diagonal direction D2) of the lens R when viewed from the optical axis direction (first direction) D1.
By disposing the first engagement portion 21 on the opposite side of the second engagement portion 22 in the diagonal direction D2 of the holding portion body 20 in this manner, the load, i.e., the force from the holding portion body 20 (the force generated by the self weight of the holding portion body 20 or the lens R, etc.), which is applied to the support shaft 3 by the second engagement portion 22, can be suppressed.
In the lens driving unit 1 of the present embodiment, the pair of friction surfaces 211 extend in the surface direction perpendicular to the sandwiching direction (third direction) D3, respectively, and sandwich the driving shaft 41 in the sandwiching direction D3.
Since each inner peripheral surface 223 of the through hole 222 is pressed against the diagonal direction D2 of the support shaft 3 due to the magnetic force (magnetic attraction force) of the support magnet 225, the lens holding portion 2 is supported by the support shaft 3, and therefore, when an impact is applied to a device or the like including the lens driving unit 1, the lens holding portion 2 may slightly move with respect to the support shaft 3 only in the diagonal direction (direction in which each inner peripheral surface 223 is away from the support shaft 3) D2, and the pair of friction surfaces 211 sandwich the drive shaft 41 in the sandwiching direction (direction orthogonal to the diagonal direction D2) D3, and the pair of friction surfaces 211 can relatively move in the diagonal direction D2 with respect to the drive shaft 41. Thereby, a large load due to the movement in the diagonal direction D2 of the lens holding portion 2 can be prevented from being applied to the actuator 4 (the drive shaft 41).
In the lens driving unit 1 of the present embodiment, the lens holding portion 2 includes a holding portion main body 20 surrounding the periphery of the lens R, and a plurality of extension portions 221 extending from the holding portion main body 20 at intervals in the optical axis direction (first direction) D1, and the plurality of extension portions 221 include insertion holes 222 at positions overlapping each other when viewed from the optical axis direction D1.
The lens holding portion 2 is stable in posture with respect to the support shaft 3 because the plurality of extending portions 221 are arranged at intervals in the optical axis direction D1, as compared with the block-shaped second engaging portion that occupies the entire arrangement area of the plurality of extending portions 221, which can be made light.
In the lens driving unit 1 of the present embodiment, the lens holding portion 2 includes a holding portion main body 20 surrounding the periphery of the lens R, and a pair of extension portions 221 extending from the holding portion main body 20 at intervals in the optical axis direction (first direction) D1, and the pair of extension portions 221 are included in the second engagement portion 22, are movable in the optical axis direction D1 with respect to the support shaft 3, are engaged with the support shaft 3, and are positioned between the pair of extension portions 221 in the optical axis direction D1 at the center of gravity G of the lens holding portion 2 in a state where the lens R is held.
In this way, since the center of gravity G of the lens holder 2 or the like is located between the pair of extension portions 221 in the optical axis direction D1, when the lens driving unit 1 is in a posture in which the extending direction of the support shaft 3 (i.e., the optical axis direction D1) is set to the up-down direction, the direction of the force (force due to the self weight of the lens holder or the like) applied to the support shaft 3 through the inner peripheral surfaces 223 of the insertion holes 222 of the pair of extension portions 221 is reversed. In this way, the load of the support shaft 3 is suppressed by changing the direction of the force applied to the support shaft 3.
The lens driving unit 1 of the present embodiment includes a cover member 52 that forms the housing 5 together with the chassis 51.
According to the structure, the actuator 4, the support shaft 3, the lens holder 2, and other components are surrounded by the housing 5, and protected.
In the lens driving unit 1 of the present embodiment, a portion on one side in the optical axis direction D1 of the support shaft 3, which is engaged with the second engagement portion 22 (in the example of the present embodiment, a portion from one extension 221 to the other extension 221 in the optical axis direction (first direction) D1), is fixed to the base 51, and a portion on the other side in the optical axis direction D1, which is engaged with the second engagement portion 22, is fixed to the cover member 52. By fixing the housing 5 to both sides of the engagement portion with the second engagement portion 22 of the support shaft 3 in this way, the strength of the support shaft 3 against the force applied by the lens holding portion 2 can be enhanced, and damage to the support shaft 3 and the like when the mobile terminal or the like in which the lens driving unit is disposed is impacted can be prevented.
In the lens driving unit 1 of the present embodiment, the first engaging portion 21 is formed by bending a band-plate-shaped metal member into a predetermined shape. In this way, the first engaging portion 21 is formed by bending the band plate-shaped metal member, and thus the structure of the first engaging portion 21 can be simplified.
In the lens driving unit 1 of the present embodiment, the pair of friction surfaces 211 are included on the surface of the metal member having a band plate shape. In this way, by the structure in which the drive shaft 41 of the actuator 4 is sandwiched by one member (a metal member having a band plate shape), the number of members can be suppressed as compared with the structure in which the drive shaft 41 is sandwiched by a plurality of members.
In the lens driving unit 1 of the present embodiment, the force with which the pair of friction surfaces 211 sandwich the driving shaft 41 is generated by the elasticity of the band-plate-shaped metal member. In this way, the structure of the drive shaft 41 can be simplified by elastically sandwiching the metal member in the form of a band.
The lens driving unit according to the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the structure of one embodiment may be added to the structure of another embodiment, and a part of the structure of one embodiment may be replaced with another embodiment. Further, a part of the structure of an embodiment may be deleted.
In the lens driving unit 1 of the above embodiment, the support magnet 225 is arranged on the holding unit body 20 side (right side in fig. 6) with respect to the support shaft 3 in the diagonal direction D2, but the configuration is not limited thereto. The support magnet 225 may be disposed on the opposite side (left side in fig. 6) of the holding portion body 20 with respect to the support shaft 3 in the diagonal direction D2.
In the lens driving unit 1 of the above embodiment, the support shaft 3 is configured to support the lens holding portion 2 so as to be movable in the optical axis direction D1 by applying the magnetic attraction force of the support magnet 225 constituting the second engagement portion 22 of the lens holding portion 2 to the support shaft 3 configured by the magnet, but the present invention is not limited to this configuration. For example, the support shaft 3 may be configured by a magnet, and the second engagement portion 22 of the lens holding portion 2 may be disposed on the magnet (in detail, a strong magnet such as iron), and the magnetic attraction force of the support shaft 3 may be applied to the magnet of the second engagement portion 22, whereby the support shaft 3 supports the lens holding portion 2 so as to be movable in the optical axis direction D1.
The specific configuration in which the support shaft 3 supports the lens holding portion 2 so as to be movable in the optical axis direction D1 is not limited. The support shaft 3 may be configured to support the lens holder 2 so as to be movable in the optical axis direction D1, and may be configured not to use a magnetic force.
In the lens driving unit 1 of the above embodiment, the support shaft 3 and the actuator 4 are disposed on both sides of the lens holding portion 2 in the radial direction (the diagonal direction D2) of the lens R, that is, the lens R is disposed at a position sandwiched in the radial direction (specifically, in the radial direction of the position passing through the optical axis C of the lens R), but may be disposed at other positions.
In the lens driving unit 1 of the above embodiment, the pair of friction surfaces 211 are arranged on one member, but the present invention is not limited to this configuration. The pair of friction surfaces 211 may be disposed on different members.
In the insertion portion 220 of the lens driving unit 1 according to the above embodiment, the through hole (insertion hole) 222 through which the support shaft 3 is inserted may be a circular hole or a polygonal hole.
In the lens driving unit 1 of the above embodiment, the support shaft 3 supports the lens holding portion 2 by magnetic force so as to be movable in the optical axis direction D1, but the present invention is not limited to this configuration. Other structures may be used as long as the support shaft 3 supports the lens holding portion 2 so as to be movable in the optical axis direction D1.
The present invention has been described in a proper and sufficient detail to best explain the present invention by referring to the drawings and by way of example, and it should be appreciated that variations and/or modifications of the above-described embodiments may be readily made by those skilled in the art. Accordingly, the modified or improved embodiments by those skilled in the art should be construed as being included in the scope of the claims unless they depart from the scope of the claims as set forth in the claims.
Reference numerals illustrate:
1: lens driving unit, 2: lens holding portion, 20: the lens holder includes a holding unit main body 21, a first engaging portion 211, a friction surface 22, a second engaging portion 220, a penetrating portion 221, an extending portion 222, a through hole (penetrating hole), 223, an inner peripheral surface 225, a supporting magnet (magnet), 23, a detecting magnet, 3, a supporting shaft, 4, an actuator, 41, a driving shaft, 42, a piezoelectric element, 43, a weight portion 5, a housing 51, a base 51, 51a, a first corner portion 51b, a second corner portion 511, a first optical path opening portion 512, a first holding portion 513, a second holding portion 52, a cover member 521, a peripheral wall portion 523, a first optical path opening portion 524, a cover side holding portion 525, a through hole, 6, a base plate portion 61, a circuit portion 62, a position sensor 100, a lens driving unit 101, a device main body 102, a holding member 102a, 102C, a third corner portion 120C, a third support post 121, 103, 122, a holding member, a housing groove 172, a holding portion 104, a bearing member 172, a bearing member 102, a bearing member, a bearing member, a bearing a.a.a.a.a.a.a.a.A.A.A.A.a.a.a.a.a.a.a.a, a.a.a.a.a.a.a.a.a.a, a.a.a, a.a.a.a.a.a, a, a.a, a, a.a.a, a- -.
Claims (14)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2023/095314 WO2024239151A1 (en) | 2023-05-19 | 2023-05-19 | Lens drive unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119343618A true CN119343618A (en) | 2025-01-21 |
Family
ID=93588675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202380009248.1A Pending CN119343618A (en) | 2023-05-19 | 2023-05-19 | Lens drive unit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2025519291A (en) |
| CN (1) | CN119343618A (en) |
| WO (1) | WO2024239151A1 (en) |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006091208A (en) * | 2004-09-22 | 2006-04-06 | Fuji Photo Film Co Ltd | Lens driving device and imaging apparatus |
| JP4923535B2 (en) * | 2005-01-27 | 2012-04-25 | コニカミノルタオプト株式会社 | Lens unit and imaging unit |
| JP2008545365A (en) * | 2005-07-07 | 2008-12-11 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Actuator assembly, method for driving actuator assembly, and apparatus for driving actuator assembly |
| KR20080093877A (en) * | 2007-04-17 | 2008-10-22 | 미쓰미덴기가부시기가이샤 | drive |
| JP2009276422A (en) * | 2008-05-13 | 2009-11-26 | Mitsumi Electric Co Ltd | Driving gear |
| JP5376115B2 (en) * | 2008-08-27 | 2013-12-25 | ミツミ電機株式会社 | Driving method of driving device |
| JP2010098902A (en) * | 2008-10-20 | 2010-04-30 | Konica Minolta Opto Inc | Drive device and image capturing apparatus |
| JP4844769B2 (en) * | 2008-11-06 | 2011-12-28 | ミツミ電機株式会社 | Drive device |
| JP2010160372A (en) * | 2009-01-09 | 2010-07-22 | Hitachi Maxell Ltd | Drive unit, lens component, and camera module |
| JP2010243985A (en) * | 2009-04-10 | 2010-10-28 | Konica Minolta Opto Inc | Method of manufacturing lens driving device |
| JP3154894U (en) * | 2009-08-18 | 2009-10-29 | 一品國際科技股▲ふん▼有限公司 | Lens drive device |
| JP5499320B2 (en) * | 2009-12-25 | 2014-05-21 | Ｔｄｋ株式会社 | Lens drive device |
| JP5560705B2 (en) * | 2009-12-25 | 2014-07-30 | Ｔｄｋ株式会社 | Lens drive device |
| JP2011186073A (en) * | 2010-03-05 | 2011-09-22 | Tdk Corp | Lens drive device |
| JP2012029495A (en) * | 2010-07-26 | 2012-02-09 | Konica Minolta Opto Inc | Driving device |
| JP5814543B2 (en) * | 2010-12-06 | 2015-11-17 | キヤノン株式会社 | Driving device, lens barrel, and optical apparatus having lens barrel |
| JP2015105988A (en) * | 2013-11-29 | 2015-06-08 | コニカミノルタ株式会社 | Actuation device, lens unit and imaging device |
| JP2021131458A (en) * | 2020-02-19 | 2021-09-09 | キヤノン株式会社 | Optical drive and optical equipment |
| CN115079367B (en) * | 2021-03-10 | 2025-08-15 | 新思考电机有限公司 | Lens driving device, camera device and electronic apparatus |
| CN115201985B (en) * | 2021-04-09 | 2025-07-15 | 新思考电机有限公司 | Lens driving device, camera device, and electronic equipment |
| CN214278521U (en) * | 2021-04-09 | 2021-09-24 | 新思考电机有限公司 | Lens driving device, camera device, and electronic apparatus |
-
2023
- 2023-05-19 CN CN202380009248.1A patent/CN119343618A/en active Pending
- 2023-05-19 JP JP2023533386A patent/JP2025519291A/en active Pending
- 2023-05-19 WO PCT/CN2023/095314 patent/WO2024239151A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2025519291A (en) | 2025-06-26 |
| WO2024239151A1 (en) | 2024-11-28 |
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