CN113820821A - Ball-guided piezoelectric automatic focusing motor module - Google Patents
Ball-guided piezoelectric automatic focusing motor module Download PDFInfo
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- CN113820821A CN113820821A CN202111084223.7A CN202111084223A CN113820821A CN 113820821 A CN113820821 A CN 113820821A CN 202111084223 A CN202111084223 A CN 202111084223A CN 113820821 A CN113820821 A CN 113820821A
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- carrier
- ball
- piezoelectric
- optical axis
- guided
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
Abstract
The invention discloses a ball-guided piezoelectric automatic focusing motor module, which comprises a shell, a base, a lens fixed on the shell, a carrier positioned in the shell, a guide mechanism, a piezoelectric power module and a control circuit, wherein an image sensor is loaded on the carrier, the guide mechanism is used for limiting the carrier to only move linearly along the optical axis direction, the piezoelectric power module moves the carrier after being electrified and drives the carrier and the component modules thereon to move back and forth along the optical axis direction. The image sensor is driven to hover and focus at different focusing positions by changing the current parameters of the piezoelectric power module, and the piezoelectric power module strengthens the trend of moving up and down by means of the longitudinal vibration shaft so as to achieve more remarkable motion conduction efficiency and promote the lens motor to achieve an accurate and efficient focusing effect.
Description
Technical Field
The invention relates to the technical field of voice coil motors, in particular to a ball-guided piezoelectric automatic focusing motor module.
Background
At present, a common voice coil motor module mainly comprises a shell, an upper elastic sheet, a lens carrier, a coil wound around the lens carrier, a lower elastic sheet and a base, wherein a magnet group is arranged on the periphery of the lens carrier to generate a magnetic field, the lens carrier is suspended between the shell and the base by the upper elastic sheet and the lower elastic sheet, and when the coil is electrified, electromagnetic force is generated to drive the lens carrier and a lens on the lens carrier to move back and forth along the direction of an optical axis so as to realize a focusing function. The structure of the conventional voice coil motor module is more complex, parts are more numerous, the micro-vibration caused by the electromagnetic induction on the lens carrier is non-directional, the lens carrier can shake along with the circumferential direction in the up-and-down moving process, and in order to adapt to the increasingly simplified appearance trend of digital products, a focusing motor module with lighter weight and higher focusing precision is needed to be developed.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a ball-guided piezoelectric automatic focusing motor module to solve the technical problems that a voice coil motor in the prior art is complex in structure and difficult in control of the vibration direction.
The technical effect to be achieved by the invention is realized by the following technical scheme:
a ball-guided piezoelectric auto-focusing motor module comprises
A housing and a base;
a lens fixedly arranged on the shell;
a carrier located inside the housing, the carrier carrying a component module;
a guide mechanism for limiting a degree of freedom of the carrier such that the carrier can move only linearly in an optical axis direction;
the piezoelectric power module comprises a vibration shaft and a piezoelectric device, the piezoelectric device is connected with the bottom end of the vibration shaft, the piezoelectric device drives the vibration shaft to vibrate up and down, and the vibration shaft is connected with the carrier;
and the control circuit is used for controlling the piezoelectric power module to vibrate the carrier and driving the carrier and the component modules thereon to translate back and forth along the optical axis direction of the lens.
Preferably, guiding mechanism includes the direction muscle, the direction muscle sets up along the optical axis direction the lateral surface of carrier, the direction muscle with form half-open guide way between the inside wall of casing, a plurality of direction ball has been placed to the guide way.
Preferably, the carrier cover is equipped with the locating frame, the edge of base is equipped with the stand, the lateral wall of locating frame with the stand butt, the inside wall of locating frame with the direction ball butt.
Preferably, the number of the guide ribs is more than two, the guide ribs are symmetrically arranged relative to the central line of the carrier respectively, the guide balls fill the guide grooves along the optical axis direction, and when the vibration shaft drives the carrier to vibrate, the guide balls can restrict the rotation and the side-turning motion of the carrier, so that the carrier can only vibrate up and down along the optical axis direction.
Preferably, the guide balls are in the form of steel balls.
Preferably, the vibration shaft is arranged along the optical axis direction, and a sliding block is fixedly arranged on the outer side surface of the carrier and connected with the vibration shaft.
Preferably, the sliding block is in a plastic spring plate form, the plastic spring plate is wound around the center line of the sliding block to form a hollow clamping opening in the middle, and the clamping opening is used for sleeving and clamping the vibration shaft.
Preferably, the circumferential surface of the carrier is provided with an installation groove, the slider is detachably clamped on the installation groove, a circular notch is formed between the clamping opening and the installation groove when viewed from the optical axis direction, and the aperture of the notch is close to the diameter of the vibration shaft.
Preferably, the piezoelectric device is spaced from the carrier and the component module.
Preferably, the component module includes an image sensor.
Compared with the prior art, the invention has the beneficial effects that:
compared with the conventional voice coil motor module, the lens motor module provided by the invention drives the image sensor and other component modules to hover and focus at different focusing positions by changing the current parameters of the piezoelectric power module, so that the lens motor module provided by the invention can complete focusing without configuring components such as an upper elastic sheet, a lower elastic sheet, a magnet coil group and the like, the part design is simpler, the winding process is simpler, and the lens motor module tends to be light and even miniaturized.
The invention sets the lens to be relatively immobile, utilizes the frequency vibration generated after the piezoelectric power module is electrified to drive the vibration shaft to shake, the shake of the vibration shaft is mainly longitudinal and accompanied with certain circumferential amplitude, the invention is provided with a guide mechanism mainly comprising guide balls, and the rotatable balls are utilized to restrict the rotation and side-turning motion of the carrier, so that the carrier can only move along the longitudinal direction (namely the optical axis direction); in the process, the sliding block tightly clamps the vibration shaft by utilizing the elastic structure of the sliding block, and the sliding block has a certain width, so that the conduction of vibration energy is more comprehensive and stable; the invention starts from the two aspects, and the lens motor is promoted to achieve a more accurate and efficient focusing effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an assembly diagram of a lens motor module according to the present embodiment;
fig. 2 is a disassembled schematic view of the lens motor module provided in this embodiment;
fig. 3 is a schematic structural diagram of the piezoelectric power module of the present embodiment;
in the drawings, 1-housing; 2-a base; 3-a slide block; 4-a clamping port; 5-a carrier; 6-a guide mechanism; 61-a guide rib; 62-guide balls; 63-a guide groove; 64-a limit bar; 7-a piezoelectric power module; 71-a vibration shaft; 72-a piezoelectric device; 8-positioning frame; 9-upright post; 10-mounting groove.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and fig. 2, the present embodiment provides a ball-guided piezoelectric auto-focusing motor module, where the motor module includes a housing 1 and a base 2, a lens (not shown) may be fixedly disposed on a top of the housing 1, a carrier 5 carrying a component module is placed on the base 2, one end of the carrier 5 is connected to a guide mechanism 6, and a moving direction is determined by the guide mechanism 6; the side wall of the carrier 5 is connected with a piezoelectric power module 7, the piezoelectric power module 7 is connected with a control circuit, and after the carrier is electrified, the piezoelectric power module 7 generates vibration with a certain frequency and transmits the kinetic energy to the carrier 5, so that the carrier 5 and the component modules thereon generate synchronous vibration.
Referring to fig. 1 and 3, the piezoelectric power module 7 includes a vibration shaft 71 and a piezoelectric device 72, the vibration shaft 71 is parallel to the optical axis direction, the piezoelectric device 72 is disposed on the base 2, and a top surface of the piezoelectric device 72 is attached to a bottom surface of the vibration shaft 71, so that the piezoelectric device 72 can drive the vibration shaft 71 to vibrate synchronously in an energized state, the vibration itself is mainly in the vertical amplitude and is assisted by circumferential shaking, and the circumferential shaking can be eliminated under the limiting action of the guide mechanism 6, so that only the vertical vibration of the vibration shaft 71 can be effectively conducted. The vibration shaft 71 is connected to the side surface of the carrier 5, so as to transmit the vibration action to the carrier 5 and the component module thereon, the component module includes an image sensor, and in the process of moving the carrier 5 up and down, the distance from the image sensor to the lens changes, that is, the focal length changes, so as to obtain different focusing effects.
With reference to fig. 1 and fig. 2, specifically, the guiding mechanism 6 includes a guiding rib 61 and a guiding ball 62, the guiding rib 61 is disposed on an outer side surface of the carrier 5 along an optical axis direction, one surface of the guiding rib 61 facing an inner side wall of the housing 1 is recessed to form a half-opened guiding groove 63, a plurality of guiding balls 62 are disposed in the guiding groove 63 from bottom to top, a top portion of the guiding groove 63 is provided with a protruding limiting bar 64 for limiting a maximum moving amount of the guiding ball 62, at this time, the guiding ball 62 located at the lowermost position abuts against the base 2, the guiding ball 62 located at the uppermost position abuts against the limiting bar 64, when the housing 1 is fitted with the base 2, an inner side edge of the guiding ball 62 abuts against the guiding groove 63, an outer side edge thereof abuts against an inner side wall of the housing 1, and is thereby being limited in the guiding groove 63, of course, there is a certain amount of space between each of the guide balls 62, and thus it is still able to rotate around itself.
The guide balls 62 fill the guide grooves 63 along the optical axis direction, and when the vibration shaft 71 drives the carrier 5 to vibrate, the guide balls 62 can absorb and convert the transverse acting force of the carrier 5 into self-rotation motion, so that the rotation and side-turning motion of the carrier 5 are restrained, and the carrier 5 can only vibrate up and down along the optical axis direction.
In order to ensure that the carrier 5 can move smoothly, the number of the guide ribs 61 is preferably two or more, and the guide ribs are respectively positioned on both sides of the carrier 5 or symmetrically arranged with respect to the center line of the carrier 5.
In this embodiment, the guide balls 62 are in the form of steel balls, the steel balls have smooth surfaces, and have extrusion resistance and scraping resistance obviously superior to those of other materials such as plastics, and can adapt to guide and limit actions for a long time.
In some embodiments, in order to ensure the compactness of the internal structure of the motor, more effectively define the position of the carrier 5, and prevent the excessive displacement from affecting the focusing operation of the lens, the outer edge of the carrier 5 can be sleeved with a positioning frame 8, the size of the positioning frame 8 is smaller than that of the housing 1, the four corners of the base 2 are all provided with upright posts 9, when the positioning frame 8 is sleeved with the carrier 5, the outer side wall of the positioning frame 8 is abutted and limited by the upright posts 9, the inner side wall is abutted with the guide ball 62 and the corresponding outer side wall of the carrier 5, and the top of the positioning frame 8 is abutted and pressed by the housing 1, so far, the positioning frame 8 completely fills the space between the carrier 5 and the housing 1, and the compactness of the internal installation of the motor module is ensured.
According to the invention, the piezoelectric power module 7 is arranged, frequency vibration generated after power connection is conducted to the longitudinal vibration shaft body 71, and circumferential movement of the vibration shaft 71 is counteracted by the guide mechanism 6, so that more obvious up-and-down movement is provided, and displacement power of the image sensor in the optical axis direction is improved. Compared with the conventional method of driving the lens to move by utilizing the electromagnetic phenomenon so as to change the focal length, the invention realizes the framework opposite to the conventional voice coil motor module by means of the working characteristics of the piezoelectric power module, and forms the motion relation of the image sensor moving and the lens being static, according to the design, the components of the motor module are simpler, the focusing can be completed without arranging elements such as a magnet group, a coil and the like, so that the overall size of the module is obviously reduced, the thickness can be further reduced, and the miniaturization and the light weight of the product are promoted to a great extent; secondly, the piezoelectric power module 7 can drive the image sensor to hover and focus at different focusing positions by changing current parameters, and directly excite and control the movement of the image sensing device 41 through power transmission, so that the focusing speed and the focusing precision are greatly improved; in addition, the lens which does not need to move can be hermetically installed with the shell 1, and a complete dustproof effect is achieved.
Further, this embodiment still improves the connection structure of vibration axle 71 with carrier 5, specifically, the lateral surface of carrier 5 is fixed and is equipped with slider 3, slider 3 adopts the form of plastics shell fragment, plastics shell fragment is circuitous around self central line and encircles in order to form hollow centre gripping mouth 4 in the middle part, centre gripping mouth 4 is used for the cover to establish and centre gripping vibration axle 71.
Because the slide block 3 is of a sheet structure and has a certain width along the optical axis direction, the clamping area is wider, the motion of vertical vibration can be transmitted to the slide block 3 in a proportion as large as possible, so that the vibration of the slide block 3 is mainly longitudinal and auxiliary circumferential, and therefore, even after the guide mechanism 6 cancels the rotation and side-turning motion in the circumferential direction, the slide block 3 still can keep a larger longitudinal vibration frequency and provide enough power for the focusing adjustment of the lens; in addition, the slider 3 can also utilize the characteristic of curved surface trend, the coiling forms with the circular, semicircular or even multiple-point protruding clamping head that vibration shaft 71 global shape suits, utilizes the advantage on shape and the elastic material to closely the centre gripping vibration shaft 71, can bear the vibration conduction of small amplitude and high frequency for a long time, and more importantly, the plastic products possess excellent insulating properties, can avoid arranging in the piezoelectricity power module 7 produces electric radiation to carrier 5 and components and parts module, has influenced the working property of components and parts module.
In some embodiments, in order to adapt to practical assembly requirements and facilitate replacement and maintenance, the sliding block 3 may be designed to be detachable, in which case, the peripheral surface of the carrier 5 should be provided with a mounting groove 10 with a semicircular opening, the clamping opening 4 of the sliding block is correspondingly provided with a semicircular opening, two sides of the clamping opening 4 are provided with a snap-fit type so as to be detachably snapped on the mounting groove 10, and the clamping opening 4 and the mounting groove 10 form a circular notch viewed from the optical axis direction, and the diameter of the notch is close to the diameter of the vibration shaft 71 so as to clamp the vibration shaft 71.
In this embodiment, the piezoelectric device 72 is spaced apart from the carrier 5 and the component module, one end of the piezoelectric device 72 is connected to the base 2, and the other end is indirectly connected to the carrier 5 through the vibration shaft 71, so that the piezoelectric device 72 does not directly contact the image sensor, thereby preventing resonance, and avoiding unnecessary interference with focusing movement.
In summary, the present invention provides a camera motor module with simple design and convenient manufacturing and production, which utilizes the piezoelectric micro-motion principle to make the image sensor move back and forth relative to the lens to achieve the optimal focusing, thereby eliminating the use of spring plate, coil, magnet set and other components, simplifying the part design and simplifying the winding process, and on the basis, still providing the equal and even more accurate focusing function.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A ball-guided piezoelectric automatic focusing motor module is characterized by comprising
A housing and a base;
a lens fixedly arranged on the shell;
a carrier located inside the housing, the carrier carrying a component module;
a guide mechanism for limiting a degree of freedom of the carrier such that the carrier can move only linearly in an optical axis direction;
the piezoelectric power module comprises a vibration shaft and a piezoelectric device, the piezoelectric device is connected with the bottom end of the vibration shaft, the piezoelectric device drives the vibration shaft to vibrate up and down, and the vibration shaft is connected with the carrier;
and the control circuit is used for controlling the piezoelectric power module to vibrate the carrier and driving the carrier and the component modules thereon to translate back and forth along the optical axis direction of the lens.
2. The ball-guided piezoelectric autofocus motor module of claim 1, wherein the guiding mechanism comprises a guiding rib disposed on an outer side surface of the carrier along an optical axis direction, a semi-open guiding groove is formed between the guiding rib and an inner side wall of the housing, and a plurality of guiding balls are disposed in the guiding groove.
3. The ball-guided piezoelectric autofocus motor module of claim 2, wherein the carrier housing has a positioning frame, the base has a pillar at a corner, an outer sidewall of the positioning frame abuts against the pillar, and an inner sidewall of the positioning frame abuts against the guiding ball.
4. The ball-guided piezoelectric autofocus motor module of claim 3, wherein the number of the guide ribs is two or more, the two or more guide ribs are symmetrically disposed with respect to the center line of the carrier, the guide balls fill the guide grooves along the optical axis, and when the vibration shaft drives the carrier to vibrate, the guide balls can restrict the rotation and the lateral tilting of the carrier, so that the carrier can only vibrate up and down along the optical axis.
5. The ball-guided piezoelectric autofocus motor assembly of claim 4, wherein the guide ball is in the form of a steel ball.
6. The ball-guided piezoelectric autofocus motor assembly of claim 1, wherein the vibration axis is disposed along the optical axis, and a slider is fixed to an outer side of the carrier and connected to the vibration axis.
7. The ball-guided piezoelectric autofocus motor module of claim 6, wherein the slider is in the form of a plastic leaf spring, the plastic leaf spring is wound around a center line of the slider to form a hollow clamping opening in the middle, and the clamping opening is used for sleeving and clamping the vibration shaft.
8. The ball-guided piezoelectric autofocus motor module of claim 7, wherein a mounting groove is formed on a peripheral surface of the carrier, the slider is detachably engaged with the mounting groove, the clamping opening and the mounting groove form a circular notch when viewed from the optical axis direction, and an aperture of the notch is close to a diameter of the vibration axis.
9. The ball-guided piezoelectric autofocus motor assembly of claim 1, wherein the piezoelectric device is spaced apart from the carrier and the component module.
10. The ball-guided piezoelectric autofocus motor module of claim 1, wherein the component module comprises an image sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111084223.7A CN113820821A (en) | 2021-09-16 | 2021-09-16 | Ball-guided piezoelectric automatic focusing motor module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111084223.7A CN113820821A (en) | 2021-09-16 | 2021-09-16 | Ball-guided piezoelectric automatic focusing motor module |
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| CN113820821A true CN113820821A (en) | 2021-12-21 |
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| CN202111084223.7A Pending CN113820821A (en) | 2021-09-16 | 2021-09-16 | Ball-guided piezoelectric automatic focusing motor module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115348384A (en) * | 2022-02-28 | 2022-11-15 | 新思考电机有限公司 | Camera device and electronic apparatus |
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2021
- 2021-09-16 CN CN202111084223.7A patent/CN113820821A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115348384A (en) * | 2022-02-28 | 2022-11-15 | 新思考电机有限公司 | Camera device and electronic apparatus |
| CN115348384B (en) * | 2022-02-28 | 2023-12-26 | 新思考电机有限公司 | Camera device and electronic apparatus |
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