CN113740991A - Lens driving device, imaging device, and electronic apparatus - Google Patents
Lens driving device, imaging device, and electronic apparatus Download PDFInfo
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- CN113740991A CN113740991A CN202111069176.9A CN202111069176A CN113740991A CN 113740991 A CN113740991 A CN 113740991A CN 202111069176 A CN202111069176 A CN 202111069176A CN 113740991 A CN113740991 A CN 113740991A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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Abstract
The invention relates to a lens driving device, an imaging device and an electronic apparatus. The technical problems that the design is unreasonable and the like in the prior art are solved. The lens driving device includes a frame; the first carrier is positioned in the frame and used for carrying a first lens, one side of the first carrier is connected with the frame in a sliding mode, and the other side, opposite to one side of the first carrier, of the first carrier is suspended; the second carrier is positioned in the frame and used for carrying a second lens, one side of the second carrier is in sliding connection with one side of the first carrier in sliding connection with the frame, and the other side of the second carrier, which is opposite to one side of the second carrier, is suspended; the large-stroke mechanical driving mechanism drives the first carrier to axially move along the optical axis and drives the second carrier to move along the optical axis in the same direction along the optical axis; and the small-stroke driving mechanism drives the second carrier to axially move on the optical axis relative to the first carrier. The invention has the advantages that: the large thrust and the long distance are focused, and the focusing is quick and accurate.
Description
Technical Field
The invention belongs to the technical field of camera focusing, and particularly relates to a lens driving device, a camera device and electronic equipment.
Background
In the field of camera motors, periscopic motors, which are one of the continuous zoom motors.
The existing continuous zooming generally adopts two sets of piezoelectric driving respective lens supports to move so as to realize focusing. There is also a driving method using a magnet and a coil to perform driving focusing of the lens holder.
The above two methods have the following disadvantages:
firstly, the focusing stroke of the continuous zooming is small, and the requirement of long-distance focusing cannot be met.
Secondly, the focusing speed is slow and the thrust is small, which cannot meet the use requirements of long distance and heavy load.
Thirdly, the debugging process is complex and the production period is long, so that the motor cannot be produced in batch.
Fourth, it is both sides and frame sliding connection for it of current lens support, leads to the volume of whole motor great, is unfavorable for the development and application of miniaturation.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens driving device, an imaging device, and an electronic apparatus that can solve the above problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the lens driving device includes:
a frame;
the first carrier is positioned in the frame and used for carrying a first lens, one side of the first carrier is connected with the frame in a sliding mode, and the other side, opposite to one side of the first carrier, of the first carrier is suspended;
the second carrier is positioned in the frame and used for carrying a second lens, the first carrier and the second carrier are sequentially distributed along the axial direction of the optical axis, one side of the second carrier is in sliding connection with one side of the first carrier in sliding connection with the frame, and the other side of the second carrier opposite to one side of the second carrier is suspended;
the large-stroke mechanical driving mechanism drives the first carrier to axially move along the optical axis and drives the second carrier to move along the optical axis in the same direction along the optical axis;
and the small-stroke driving mechanism is positioned between one side of the first carrier and one side of the second carrier and drives the second carrier to axially move on the optical axis relative to the first carrier.
In the above lens driving device, the large-stroke mechanical driving mechanism includes a stepping motor, an output shaft of the stepping motor is connected to a worm, and a transmission member having teeth engaged with the worm is connected to one side of the first carrier.
In the lens driving device, a fixing plate is fixedly connected to one side of the first carrier, and the transmission member is obliquely fixed to the fixing plate.
In the lens driving device, the fixed plate has a free end, the free end of the fixed plate is provided with an inclined plate, the lower end of the inclined plate extends to the lower side of the worm and is connected with the fixed plate, the upper end of the inclined plate is free, and the transmission member is fixed on the inclined surface of the inclined plate.
In the lens driving device, the driving member is block-shaped, the teeth are disposed on an upper inclined surface of the driving member, an inclined fixing groove having an inclined direction identical to that of the inclined plate is disposed on a lower inclined surface of the driving member, the inclined plate is clamped in the inclined fixing groove, a protrusion is disposed at a bottom of the inclined fixing groove, a through hole body into which the protrusion is inserted is disposed on the inclined plate, and the protrusion is inserted into the through hole body.
In the lens driving device, an outer convex portion is disposed on one side of the first carrier, two parallel guide rods are disposed on one side of the frame, two guide holes are disposed on the outer convex portion, the guide rods penetrate through the guide holes one by one, and the guide rods are inserted into the guide holes.
In the above lens driving device, the outer convex portion extends to the outside of one side of the second carrier, and a ball guide mechanism is provided between the inner side surface of the outer convex portion close to the second carrier and the second carrier.
In the above lens driving device, the ball guide mechanism includes guide grooves provided on an inner side surface of the outer convex portion, the guide grooves are distributed along the optical axis direction, the balls are provided on a side surface of the second carrier near the outer convex portion, and a partial spherical surface of the balls is in rolling contact with the guide grooves.
In the above lens driving device, there are two guide grooves, and each guide groove is in rolling contact with a part of the spherical surface of each of the plurality of balls.
In the lens driving device, a ball housing groove is provided on a side surface of the second carrier adjacent to the convex portion, and the ball is partially housed in the ball housing groove such that a spherical surface of the ball is in contact with a groove wall of the ball housing groove.
In the lens driving device, the outer protrusion is further provided with a communication port communicating with the guide hole, the communication port exposes the guide rod inserted into the guide hole, and the outer protrusion is provided with an anti-rotation elastic clip located in the communication port and clipped on the exposed section of the guide rod.
In the lens driving device, the small-stroke driving mechanism includes an outward protrusion arranged on an inner side surface of the second carrier close to the outward protrusion, an avoiding groove body with an opening facing the second carrier is arranged inside the outward protrusion, the outward protrusion is inserted into the avoiding groove body, a coil mounting hole is arranged at the bottom of the avoiding groove body, a driving magnet is arranged on one surface of the outward protrusion opposite to the bottom of the avoiding groove body, and the driving magnet is matched with a driving coil arranged in the coil mounting hole to generate lorentz force and drive the second carrier to move relative to the first carrier.
In the lens driving device, the coil mounting hole is a through hole, the outer convex portion is provided with a coil flexible circuit board fixed to an outer orifice of the coil mounting hole, the coil flexible circuit board is electrically connected with the driving coil, the outer convex portion is circumferentially sleeved with the side frame, the outer side of the side frame is connected with the cantilever portion, and the coil flexible circuit board is electrically connected with the power supply circuit board on the outer wall of one side of the frame through the arc-shaped flexible circuit board of which one end is fixed on the cantilever portion.
In the above lens driving device, the lens driving device further includes a transmission structure for contacting the second carrier and moving the second carrier along with the first carrier when the first carrier moves in the opposite direction with respect to the second carrier.
In the lens driving device, the transmission structure includes an L-shaped baffle, one end of the L-shaped baffle is fixed to a side of the first carrier connected to the frame, the other end of the L-shaped baffle is fixed to a suspended side of the first carrier, the L-shaped baffle and one end of the first carrier close to the second carrier surround to form a carrier accommodating space, and the second carrier is located in the carrier accommodating space.
The invention also provides an image pickup device which is provided with the lens driving device.
The invention also provides electronic equipment with the camera device.
Compared with the prior art, the invention has the advantages that:
by utilizing the mode of sliding connection at one side and suspension at the other side, the volume of the first carrier/the second carrier can be reduced, the moving resistance of the first carrier/the second carrier can be further reduced, the moving speed is favorably improved, and the moving smoothness is ensured.
It can be used for the drive of heavily loaded of mechanical drive, simultaneously, can also satisfy the drive requirement of big stroke, and secondly, its drive of mechanical drive is more accurate and be convenient for regulate and control, has reduced the manufacturing degree of difficulty by a wide margin to and the drive is more timely and stable.
Step motor + ball VCM, simple structure focuses fast and accurate, has improved the definition of making a video recording.
Utilize anti-rotation elasticity to press from both sides and carry out the centre gripping to the guide bar, can prevent that first carrier from taking place rotatoryly under the drive of motor rotary drive power for first carrier removes more stably smooth-going, can not take place the slight rotation of carrier itself and influence the result of zooming when the carrier moves along the optical axis.
Drawings
Fig. 1 is a schematic perspective view of a lens driving device according to the present invention.
Fig. 2 is a schematic structural diagram of a large-stroke mechanical driving mechanism provided by the invention.
Fig. 3 is a schematic structural view of another wide-stroke mechanical driving mechanism according to the present invention.
Fig. 4 is a schematic structural view of an anti-rotation spring clip guide bar provided by the present invention.
Fig. 5 is a schematic structural diagram of the lens driving apparatus provided by the present invention after the cover plate is exploded.
Fig. 6 is an exploded view of the lens driving apparatus according to the present invention.
Fig. 7 is a schematic top view of a lens driving device according to the present invention.
Fig. 8 is a schematic sectional view taken along line a-a in fig. 7.
Fig. 9 is a schematic view of the structure of fig. 7 taken along line B-B.
FIG. 10 is a schematic diagram of a second carrier structure provided by the present invention.
Fig. 11 is an exploded view of the driving member and the tilt fixing plate according to the present invention.
Fig. 12 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 13 is a schematic structural view of fig. 12 with prisms added.
FIG. 14 is a schematic diagram of a third structure of the present invention.
FIG. 15 is a schematic structural view of a carrier anti-rotation mechanism provided by the present invention.
In the figure, the frame 1, the aperture 10, the cover plate 11, the circuit board fixing portion 12, the first carrier 2, the fixing plate 20, the inclined plate 21, the through hole body 210, the outward protruding portion 23, the guide groove 24, the positioning pin 240, the guide rod 25, the anti-rotation elastic clip 26, the U-shaped portion 260, the lateral fixing portion 261, the pin hole 262, the side frame 27, the cantilever portion 270, the L-shaped baffle plate 28, the communication port 29, the second carrier 3, the ball 30, the ball receiving groove 31, the large stroke mechanical driving mechanism 4, the stepping motor 40, the bracket 400, the worm 41, the transmission member 42, the inclined fixing groove 421, the protrusion 422, the tooth 420, the small stroke driving mechanism 5, the outward protrusion 5a avoiding groove body 50, the coil mounting hole 51, the driving magnet 52, the driving coil 53, the coil flexible circuit board 6, the arc flexible circuit board 60, the motor power supply circuit board 61, and the power supply circuit board 7.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Example one
The arrows in fig. 5 are incident light.
As shown in fig. 1, 5 and 9, the lens driving device of the present embodiment includes a frame 1. The frame 1 is a rectangular frame, two short sides of the frame 1 are respectively provided with an optical hole 10, one of the optical holes is an incident optical hole, and the incident optical hole is used for installing a lens.
The cover plates 11 are respectively arranged on two sides of the frame 1 in the thickness direction, so that the two cover plates 11 and the inside of the frame 1 form a cavity, and the internal components are protected.
The first carrier 2 is positioned in the frame 1 and used for carrying a first lens, one side of the first carrier 2 is connected with the frame 1 in a sliding mode, and the other side, opposite to one side of the first carrier 2, of the first carrier 2 is suspended.
Utilize the sliding connection of unilateral, the unsettled mode of opposite side, it not only can reduce the volume of first carrier 2, but also can further reduce first carrier 2 and remove the resistance, does benefit to the translation rate and further promotes, ensures to remove the ride comfort.
The second carrier 3 is located in the frame 1 and used for carrying a second lens, the first carrier 2 and the second carrier 3 are sequentially distributed along the axial direction of the optical axis, one side of the second carrier 3 and one side of the first carrier 2 in sliding connection with the frame 1 are in sliding connection, and the other side, opposite to one side of the second carrier 3, of the second carrier 3 is suspended. Utilize the sliding connection of unilateral, the unsettled mode of opposite side, it not only can reduce the volume of second carrier 3, but also can further reduce second carrier 3 and remove the resistance, does benefit to the translation rate and further promotes, ensures to remove the ride comfort.
Secondly, the second carrier 3 is connected to the first carrier 2 in a sliding mode, when the first carrier 2 moves, the second carrier 3 is driven to move along, the association relation of the mother carrier and the child carrier is formed, and in the synchronous moving process, the focusing efficiency can be greatly improved.
Further, when the first carrier 2 moves to the second carrier 3 side, the second carrier 3 can be driven to move synchronously after the first carrier 2 and the second carrier 3 are contacted; of course, the lens driving device further comprises a transmission structure for contacting the second carrier 3 and moving the second carrier 3 along with the first carrier 2 when the first carrier 2 moves in reverse relative to the second carrier 3. Specifically, the transmission structure comprises an L-shaped baffle 28, one end of the L-shaped baffle 28 is fixed on one side of the first carrier 2 connected with the frame 1, the other end of the L-shaped baffle 28 is fixed on the suspended side of the first carrier 2, a carrier accommodating space is formed by the L-shaped baffle 28 and one end of the first carrier 2 close to the second carrier 3 in a surrounding manner, and the second carrier 3 is located in the carrier accommodating space.
The second carrier 3 is moved together with the first carrier 2 by the action of the L-shaped shutter 28, ensuring focusing efficiency.
Alternatively, the transmission structure includes an extension arm (not shown) disposed on a side of the first carrier 2 close to the second carrier 3, a sliding slot (corresponding to a waist-shaped blind hole) is disposed on an inner side surface of the extension arm close to the second carrier 3, a sliding rod extending into the sliding slot is disposed on a side of the second carrier 3, the sliding rod slides in the sliding slot, and when the first carrier 2 moves in a reverse direction relative to the second carrier 3, the sliding rod contacts with the sliding slot to enable the second carrier 3 to move along with the first carrier 2. This is only one alternative and does not exclude other alternatives.
As shown in fig. 2 to 6, the lens driving device includes a large-stroke mechanical driving mechanism 4, the large-stroke mechanical driving mechanism 4 drives the first carrier 2 to move axially along the optical axis and the first carrier 2 drives the second carrier 3 to follow the first carrier 2 to move coaxially along the optical axis. Big stroke mechanical drive mechanism 4 is the mechanical drive mechanism mode, and it can be used for the drive of heavily loaded of mechanical drive, simultaneously, can also satisfy the drive requirement of big stroke, and secondly, its drive of mechanical drive is more accurate and be convenient for regulate and control, has reduced the manufacturing and processing degree of difficulty by a wide margin to and the drive is more timely and stable.
Specifically, the large-stroke mechanical driving mechanism 4 of the present embodiment includes a stepping motor 40, the stepping motor 40 is fixed to an inner wall of one long side of the frame 1 through a bracket 400, a worm 41 is connected to an output shaft of the stepping motor 40, and a transmission member 42 having teeth 420 is connected to one side of the first carrier 2, and the teeth 420 are engaged with the worm 41. The stepping motor 40 can precisely control the moving stroke, the worm 41 can precisely control the moving position of the first carrier 2 by meshing with the teeth 420, and the meshing locking after the corresponding position is achieved, and meanwhile, the design of the worm 41 can provide a large thrust and long-distance driving, and the heavy load and long-distance focusing requirements can be met.
The stepping motor 40 is fixed on the circuit board fixing portion 12, and a filling block 43 is disposed on a side of the stepping motor 40 away from the circuit board fixing portion 12, so that the stepping motor 40 is more stably fixed.
Secondly, this method is also advantageous in that it is easy to assemble and disassemble, so long as the worm 41 is engaged with the teeth 420, and there is no need for complicated operations such as mutual engagement.
As another embodiment, the large-stroke mechanical driving mechanism 4 includes a stepping motor 40, a screw rod is connected to the stepping motor 40, and a threaded sleeve is sleeved on the screw rod and fixed on the first carrier, which can meet the use requirement.
Further, as shown in fig. 9 to 10, a fixing plate 20 is fixedly connected to one side of the first carrier 2, and the transmission member 42 is fixed to the fixing plate 20 in an inclined manner. The tooth also slopes for the slope of driving medium 42, and it is from the top down equipment of being convenient for of worm to and from the top down dismantlement of following this kind of mode for whole dismouting process is simple, has improved production efficiency by a wide margin.
Meanwhile, the mode greatly reduces the tooth slipping phenomenon of the teeth and the worm, so that the service life is longer and durable, and the driving is more stable and reliable.
The fixed plate 20 has a free end 200 perpendicular to the first carrier 2 side and extending below the worm, an inclined plate 21 is provided on the free end of the fixed plate 20, the lower end of the inclined plate 21 extends below the worm 41 side and is connected to the fixed plate 20, the upper end of the inclined plate 21 is free, and the transmission member 42 is fixed to the inclined surface of the inclined plate 21.
It makes the dismouting simpler and convenient that the design of hang plate 21, simultaneously, because hang plate 21 has certain elasticity performance, can prevent that too heavy load from leading to step motor overload to damage, perhaps the damage of worm and tooth, simultaneously, hang plate 21 can make driving medium 42 have an elastic force to the worm side trend of moving all the time, ensures meshing transmission validity.
And secondly, a stamping hole is formed in the suspended end, the inclined plate 21 is integrally molded during stamping of the stamping hole, and the inclined plate 21 is connected to the wall of the stamping hole.
Preferably, the driving member 42 of the present embodiment is block-shaped, the tooth 420 is disposed on an upper inclined surface of the driving member 42, that is, the upper inclined surface of the block-shaped driving member 42, an inclined fixing groove 421 whose inclined direction is consistent with the inclined direction of the inclined plate 21 is disposed on a lower inclined surface of the driving member 42, the inclined plate 21 is clamped in the inclined fixing groove 421, a protrusion 422 is disposed on a groove bottom of the inclined fixing groove 421, a through hole body 210 into which the protrusion 422 is inserted is disposed on the inclined plate 21, and the protrusion 422 is inserted into the through hole body 210.
The transmission member 42 can be locked on the inclined plate 21 by the inclined fixing groove 421 which can limit the circumferential position of the shape of the transmission member 42 and the cooperation of the protrusion 422 and the through hole body 210.
In addition, the protrusion 422 of the present embodiment is a square protrusion, and the through hole body 210 is a square hole, so as to further improve the circumferential locking stability of the transmission member 42.
Preferably, as shown in fig. 2, 3, 5-9, the lens driving device further includes a carrier anti-rotation mechanism including:
two guide rods 25 are arranged and distributed at one side of the inner part of the frame 1 up and down;
one side of the first carrier 2 is slidably connected with two guide rods 25;
anti-rotation elastic clips 26, at least one and clipped on a guide rod 25;
the anti-rotation spring clip 26 is fixed to the first carrier 2.
Preferably, the anti-rotation elastic clips 26 of the present embodiment have two, one guide rod 25 corresponding to one anti-rotation elastic clip 26.
Preferably, the two anti-rotation elastic clips 26 of the present embodiment are distributed opposite to each other with respect to the optical axis.
Be equipped with outer convex part 23 in one side of first carrier 2, be equipped with two guide bar 25 that are parallel to each other in frame 1 one side, the both ends of guide bar 25 are fixed in two short side edges of frame, preferably, are equipped with the axle sleeve respectively at the both ends of guide bar 25 to improve the installation effectiveness, two guide bar 25 are upper and lower distribution, resistance when can reducing the drive, can also ensure simultaneously that first carrier is in the horizontal position of settlement, be equipped with two confessions on outer convex part 23 the guiding hole that guide bar 25 runs through one by one, guide bar 25 insert in the guiding hole. The guide rod is inserted into the guide hole, and the hole wall of the guide hole is provided with 1-2 tangent planes which are tangent to the cylindrical surface of the guide rod.
Of course, a guide such as a bushing may be provided in the guide hole to further reduce the friction force and increase the transfer focusing speed.
The number of the guide rods 25 is not designed to be too large, which leads to an increase in cost and resistance.
The anti-rotation elastic clip 26 is clipped on the side of the guide rod far away from the tangent plane.
Next, the outer protrusion 23 of the present embodiment extends to the outside of one side of the second carrier 3, and a ball guide mechanism is provided between the inner side surface of the outer protrusion 23 close to the second carrier 3 and the second carrier 3. Further, as shown in fig. 3 and 10, the ball guide mechanism includes a guide groove 24 provided on an inner side surface of the outer protrusion 23, the guide grooves 24 are distributed along the optical axis a direction, a ball 30 is provided on a side surface of the second carrier 3 close to the outer protrusion 23, and a part of a spherical surface of the ball 30 is in rolling contact with the guide groove 24. Preferably, the number of the guide grooves 24 is two, and each guide groove 24 is in rolling contact with a part of the spherical surface of the plurality of balls 30.
And
a ball receiving groove 31 is provided on one side surface of the second carrier 3 adjacent to the convex portion 23, and the ball 30 is partially housed in the ball receiving groove 31 such that the spherical surface of the ball 30 is in contact with the groove wall of the ball receiving groove 31.
The balls 30 are partially in contact with the guide grooves 24, the guide grooves 24 of the present embodiment are trapezoidal grooves, the size of the notch of the trapezoidal groove is larger than that of the groove bottom, and the spherical surfaces of the balls 30 are respectively in tangential contact with the three groove walls of the guide grooves 24 in such a way that the mutual friction force is reduced to the maximum extent to ensure the moving focusing efficiency.
Preferably, the ball-receiving groove 31 of the present embodiment is a ball-receiving groove surrounded by three to five inclined surfaces, and the balls 30 are in tangential contact with the ball-receiving groove 31, so that the flexibility of the balls 30 can be increased. For example, a ball receiving groove formed by four inclined surfaces.
The extension arm is connected to the end of the male part 23 remote from the first carrier.
As another embodiment, the guide grooves 24 of the ball guide mechanism may be provided on the second carrier, and the balls 30 may be provided on the inner side surface of the convex portion 23, that is, contrary to the above-described arrangement, the guide purpose may be achieved similarly.
As a second alternative transmission structure, the transmission structure includes the above-mentioned guide groove 24, and the guide groove 24 is a structure of a kidney-shaped blind hole, so that the first carrier can drive the second carrier to move synchronously.
In addition, since the worm of the stepping motor drives the teeth to perform linear driving, the first carrier 2 rotates when receiving a driving force, and the guide rod and the guide hole are in clearance fit, as shown in fig. 3, 4 and 6, in order to prevent the first carrier from moving and being stuck, the outer protrusion 23 is further provided with a communication port 29 communicated with the guide hole, the communication port 29 exposes a part of the guide rod 25 inserted into the guide hole, and the outer protrusion 23 is provided with an anti-rotation elastic clip 26 located in the communication port 29 and clipped at the exposed section of the guide rod 25. Preferably, the anti-rotation spring clip 26 of the present embodiment is clipped to the upper one of the guide bars 25 for ease of installation.
Further, as shown in fig. 15, the anti-rotation resilient clip 26 of the present embodiment includes a U-shaped portion 260 with an inward opening, and a middle portion of the U-shaped portion 260 is in tangential contact with the guide bar 25, for example, the upper guide hole has a tangential plane tangential to the guide bar, and a middle portion of the U-shaped portion 260 is opposite to the tangential plane.
The lower side guide hole is provided with two splayed tangent planes, the lower side guide rod is tangent to the two tangent planes, and the middle part of the U-shaped part 260 of the lower side anti-rotation elastic clamp 26 is in triangular distribution with the two tangent planes.
The both ends of the U-shaped portion 260 leave a gap from the guide bar 25.
As shown in fig. 4 and 6, the U-shaped portion 260 is connected to a lateral fixing portion 261, and the lateral fixing portion 261 is fixed to the periphery of one end of the communication port 29 away from the guide hole. The anti-rotation spring clip 26 is machined from sheet metal.
An opening at one end of the communication port 29, which is far away from the guide hole, is provided with a mounting step groove, the end of the transverse fixing portion 261, which is far away from the U-shaped portion 260, is arranged at the bottom of the mounting step groove, the bottom of the mounting step groove is provided with a plurality of positioning pins 240, and the end of the transverse fixing portion 261, which is arranged at the bottom of the mounting step groove, is provided with pin holes 262 for the positioning pins 240 to be inserted one by one.
The transverse fixing part 261 is disposed at the periphery of one end of the installation stepped groove and is in fit contact with the groove wall of the installation stepped groove.
Secondly, the thickness of the lateral fixing portion 261 is slightly smaller than the groove depth of the installation step groove to prevent the lateral fixing portion 261 from being thick to cause interference by being protruded outwardly.
Fixing glue may be provided between the lateral fixing portion 261 and the installation step groove to fix the lateral fixing portion 261.
Also, the lens driving device of the present embodiment further includes a small stroke driving mechanism 5, the small stroke driving mechanism 5 being located between the first carrier 2 side and the second carrier 3 side and the small stroke driving mechanism 5 driving the second carrier 3 to move axially in the optical axis direction with respect to the first carrier 2.
The small stroke drive mechanism 5 of the present embodiment is an electromagnetic drive mechanism. That is, as shown in fig. 2, 8 and 10, the small stroke driving mechanism 5 includes an outward protrusion 5a provided on an inner side surface of the second carrier 3 close to the outward protrusion 23, an escape groove 50 having an opening facing the second carrier 3 is provided inside the outward protrusion 23, the outward protrusion 5a is inserted into the escape groove 50, a coil mounting hole 51 is provided on a groove bottom of the escape groove 50, a driving magnet 52 is provided on a surface of the outward protrusion 5a facing the groove bottom of the escape groove 50, and the driving magnet 52 cooperates with a driving coil 53 mounted on the coil mounting hole 51 to generate a lorentz force to drive the second carrier 3 to move relative to the first carrier 2.
Of course, the small stroke driving mechanism 5 may also be a piezoelectric driving method, and compared with the piezoelectric driving method, the electromagnetic driving method of the present embodiment is easy to install, simpler in structure, and lower in cost.
Further, the transverse section of the convex protrusion 5a is T-shaped, and the avoiding groove 50 is a T-shaped groove, so that the structure is more stable, that is, the mounting and fixing surface of the driving magnet 52 is enlarged.
Preferably, as shown in fig. 1 and 6, the coil mounting hole 51 of the present embodiment is a through hole, the outer protrusion 23 is provided with a coil flexible circuit board 6 fixed to an outer hole of the coil mounting hole 51, the coil flexible circuit board 6 is electrically connected to the driving coil 53, the outer protrusion 23 is circumferentially sleeved with a side frame 27, the side frame 27 presses the transverse fixing portion 261 to be disposed at a section of the mounting step groove, so as to prevent the transverse fixing portion 261 from being detached, the outer side of the side frame 27 is connected to a cantilever portion 270, and the coil flexible circuit board 6 is electrically connected to the power supply circuit board 7 on the outer wall of one side of the frame 1 through an arc-shaped flexible circuit board 60 having one end fixed to the cantilever portion 270.
The arc-shaped flexible circuit board 60 is C-shaped and can deform following the movement of the second carrier 3 to meet the power supply requirement.
Secondly, step motor 40 and motor supply circuit board 61 be connected, be connected with circuit board fixed part 12 in frame 1 one side below that is equipped with guide bar 25, the one end that the flexible circuit board of arc 60 is kept away from coil flexible circuit board 6 is fixed in circuit board fixed part 12, motor supply circuit board 61 is fixed in circuit board fixed part 12, supply circuit board 7 and motor supply circuit board 61 electricity are even.
Further, the circuit boards of the present embodiment are all FPC boards.
The power supply circuit board 7 is connected with an external power supply to respectively supply power to the circuit boards connected with the power supply circuit board.
The working principle of the embodiment is as follows:
when the stepping motor 40 is energized, the worm 41 is caused to rotate, and the rotating worm causes the transmission 42 engaged therewith to be linearly displaced, i.e., axially moved along the optical axis.
The first carrier 2, which is connected to the transmission member 42, is axially displaced in the optical axis by a displacement force, which, of course, is in two directions: the first carrier 2 moves towards the second carrier 3, the first carrier 2 moves towards the side far away from the second carrier 3, and the second carrier 3 can move synchronously with the first carrier 1, so that the synchronous movement can improve the focusing efficiency and the focusing accuracy.
The stepping motor 40 is used for driving, the thrust is large, and the heavy-load requirement and the long-distance focusing requirement can be met.
When the second carrier 3 moves along with the first carrier 2, the driving coil 53 is energized, and the driving magnet 52 matched with the driving coil 53 generates a lorentz force, so that the driving force can drive the second carrier 3 to move relative to the first carrier 2, and the aim of accurate focusing is fulfilled.
The second carrier 3 may be moved to the first carrier 2 side or to the side away from the first carrier 2, and the driving in different directions may be to change the direction of the current.
Example two
Based on the first embodiment, as shown in fig. 12 to 13, the present embodiment provides an image pickup apparatus having the lens driving apparatus described in the first embodiment, wherein a first lens is disposed on the first carrier 2 of the lens driving apparatus, a second lens is disposed on the second carrier 3, and a lens is disposed at the incident light hole.
Of course, the first and second lenses described above may also be mounted in AF motors fixed to the respective first and second carriers 2, 3.
The AF motor can play a focusing role, and the focusing precision is further improved.
EXAMPLE III
Based on the second embodiment, as shown in fig. 14, the present embodiment provides an electronic apparatus having the image pickup device described in the second embodiment. Electronic devices such as: cell phones and tablet computers, etc.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (17)
1. A lens driving device comprising:
a frame (1); characterized in that the lens driving device further comprises:
the first carrier (2) is positioned in the frame (1) and used for carrying a first lens, one side of the first carrier (2) is connected with the frame (1) in a sliding mode, and the other side, opposite to one side of the first carrier (2), of the first carrier (2) is suspended;
the second carrier (3) is positioned in the frame (1) and used for carrying a second lens, the first carrier (2) and the second carrier (3) are sequentially distributed along the axial direction of the optical axis, one side of the second carrier (3) is in sliding connection with one side of the first carrier (2) in sliding connection with the frame (1), and the other side of the second carrier (3) opposite to one side of the second carrier (3) is suspended;
the large-stroke mechanical driving mechanism (4) drives the first carrier (2) to axially move along the optical axis and the first carrier (2) drives the second carrier (3) to move along the optical axis in the same direction along with the first carrier (2);
and the small-stroke driving mechanism (5) is positioned between one side of the first carrier (2) and one side of the second carrier (3), and the small-stroke driving mechanism (5) drives the second carrier (3) to move axially on the optical axis relative to the first carrier (2).
2. Lens driving device according to claim 1, characterized in that the large stroke mechanical driving means (4) comprises a step motor (40), a worm (41) being connected to the output shaft of the step motor (40), and a transmission member (42) having teeth (420) being connected to one side of the first carrier (2), said teeth (420) being in engagement with said worm (41).
3. Lens driving device according to claim 2, characterized in that a fixing plate (20) is fixedly connected to one side of the first carrier (2), and the transmission member (42) is obliquely fixed to the fixing plate (20).
4. A lens driving device according to claim 3, wherein the fixed plate (20) has a free end, a tilt plate (21) is provided on the free end of the fixed plate (20), a lower end of the tilt plate (21) extends below the worm (41) side and is connected to the fixed plate (20), an upper end of the tilt plate (21) is free, and the transmission member (42) is fixed to an upper inclined surface of the tilt plate (21).
5. The lens driving device according to claim 4, wherein the driving member (42) has a block shape, the teeth (420) are provided on an upper inclined surface of the driving member (42), an inclined fixing groove (421) having an inclined direction identical to that of the inclined plate (21) is provided on a lower inclined surface of the driving member (42), the inclined plate (21) is engaged with the inclined fixing groove (421), a protrusion (422) is provided on a groove bottom of the inclined fixing groove (421), a through hole body (210) into which the protrusion (422) is inserted is provided on the inclined plate (21), and the protrusion (422) is inserted into the through hole body (210).
6. Lens driving device according to claim 1, characterized in that the first carrier (2) is provided with a male part (23) on one side, that two mutually parallel guide rods (25) are provided on one side of the frame (1), that two guide holes are provided in the male part (23) for the guide rods (25) to pass through one by one, and that the guide rods (25) are inserted in the guide holes.
7. Lens driving device according to claim 6, characterized in that the outer protrusion (23) extends beyond a side of the second carrier (3), and that a ball guide is provided between the inner side of the outer protrusion (23) near the second carrier (3) and the second carrier (3).
8. The lens driving device according to claim 7, wherein the ball guide mechanism includes guide grooves (24) provided on inner side surfaces of the convex portions (23), the guide grooves (24) are distributed in the optical axis direction, the balls (30) are provided on a side surface of the second carrier (3) adjacent to the convex portions (23), and a part of spherical surfaces of the balls (30) are in rolling contact with the guide grooves (24).
9. The lens driving device according to claim 8, wherein there are two guide grooves (24), and each guide groove (24) is in rolling contact with a part of the spherical surface of the plurality of balls (30).
10. Lens driving device according to claim 8 or 9, characterized in that a ball receiving groove (31) is provided on a side of the second carrier (3) adjacent to the male part (23), said ball (30) being partly embedded in the ball receiving groove (31) and the spherical surface of the ball (30) and the groove wall of the ball receiving groove (31) being in tangential contact.
11. The lens driving device according to claim 6, wherein the outer protrusion (23) is further provided with a communication port (29) communicating with the guide hole, the communication port (29) exposes a portion of the guide rod (25) inserted into the guide hole, and the outer protrusion (23) is provided with an anti-rotation elastic clip (26) located in the communication port (29) and clipped on the exposed portion of the guide rod (25).
12. The lens driving device according to claim 7, wherein the small stroke driving mechanism (5) includes an outward protrusion (5a) disposed on an inner side surface of the second carrier (3) near the outward protrusion (23), an avoiding groove (50) opened toward the second carrier (3) is disposed inside the outward protrusion (23), the outward protrusion (5a) is inserted into the avoiding groove (50), a coil mounting hole (51) is disposed at a groove bottom of the avoiding groove (50), a driving magnet (52) is disposed on a surface of the outward protrusion (5a) opposite to the groove bottom of the avoiding groove (50), and the driving magnet (52) cooperates with a driving coil (53) mounted in the coil mounting hole (51) to generate a Lorentz force and drives the second carrier (3) to move relative to the first carrier (2).
13. The lens driving device according to claim 12, wherein the coil mounting hole (51) is a through hole, a coil flexible circuit board (6) fixed to an outer opening of the coil mounting hole (51) is provided on the outer protrusion (23), the coil flexible circuit board (6) is electrically connected to the driving coil (53), a side frame (27) is circumferentially fitted over the outer protrusion (23), a cantilever portion (270) is connected to an outer side of the side frame (27), and the coil flexible circuit board (6) is electrically connected to the power supply circuit board (7) on an outer wall of one side of the frame (1) through an arc-shaped flexible circuit board (60) having one end fixed to the cantilever portion (270).
14. Lens driving device according to claim 1, characterized in that the lens driving device further comprises a transmission structure for being able to contact the second carrier (3) and to move the second carrier (3) along with the first carrier (2) when the first carrier (2) is moved in opposite directions relative to the second carrier (3).
15. The lens driving device according to claim 14, wherein the transmission structure comprises an L-shaped baffle (28), one end of the L-shaped baffle (28) is fixed to a side of the first carrier (2) connected to the frame (1), the other end of the L-shaped baffle (28) is fixed to a suspended side of the first carrier (2), the L-shaped baffle (28) and one end of the first carrier (2) close to the second carrier (3) surround to form a carrier accommodating space, and the second carrier (3) is located in the carrier accommodating space.
16. An image pickup apparatus comprising the lens driving apparatus according to any one of claims 1 to 15.
17. An electronic apparatus comprising the imaging device according to claim 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111069176.9A CN113740991A (en) | 2021-09-13 | 2021-09-13 | Lens driving device, imaging device, and electronic apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111069176.9A CN113740991A (en) | 2021-09-13 | 2021-09-13 | Lens driving device, imaging device, and electronic apparatus |
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| Publication Number | Publication Date |
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| CN113740991A true CN113740991A (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111069176.9A Pending CN113740991A (en) | 2021-09-13 | 2021-09-13 | Lens driving device, imaging device, and electronic apparatus |
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| Country | Link |
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| CN (1) | CN113740991A (en) |
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| CN114114602A (en) * | 2021-12-07 | 2022-03-01 | 新思考电机有限公司 | Lens driving device and image pickup device |
| CN114137687A (en) * | 2021-12-14 | 2022-03-04 | 新思考电机有限公司 | Lens driving device and image pickup device |
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Application publication date: 20211203 |