CN111474671A - Anti-shake and focusing lens drive device, camera device, and electronic apparatus - Google Patents
Anti-shake and focusing lens drive device, camera device, and electronic apparatus Download PDFInfo
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- CN111474671A CN111474671A CN202010282575.2A CN202010282575A CN111474671A CN 111474671 A CN111474671 A CN 111474671A CN 202010282575 A CN202010282575 A CN 202010282575A CN 111474671 A CN111474671 A CN 111474671A
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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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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Abstract
The present disclosure provides an anti-shake and focus and use lens drive arrangement, include: an auto-focusing section for performing auto-focusing of the lens; a focusing base for accommodating the auto-focusing part; the Y-direction driving part comprises a Y-direction piezoelectric driving part and a first anti-shake base, the Y-direction piezoelectric driving part drives the focusing base in the Y direction, the first anti-shake base is used for supporting a first ball part, and the first ball part is used for keeping the position of the focusing base and guiding the focusing base to move; and the X-direction driving part comprises an X-direction piezoelectric driving part and a second anti-shaking base, the X-direction piezoelectric driving part drives the first anti-shaking base in the X direction, the second anti-shaking base is used for supporting the second ball part, and the second ball part is used for keeping the position of the first anti-shaking base and guiding the first anti-shaking base to move. The disclosure also provides a camera device and an electronic device.
Description
Technical Field
The present disclosure relates to a lens driving device for optical anti-shake and auto-focus, a camera device, and an electronic apparatus.
Background
Camera modules having an Auto Focusing (AF) function are widely used in mobile electronic products such as digital cameras, mobile phones, or tablet computers. However, the auto-focus motor can only drive the lens to move in the optical axis direction, and thus the problem caused by such lens deflection cannot be solved, and therefore, the camera module should have not only an auto-focus function but also an optical anti-shake function.
With the development of cameras with higher precision and higher magnification, for example, an optical anti-shake function for correcting hand shake, vibration, and the like during photographing or image capturing using a smartphone is using a more complicated correction method for hand shake, vibration, and the like. With the development of large-aperture and multi-lens lenses, the quality of the lens is increasing, which requires a larger driving force in the optical anti-shake process.
Therefore, the optical anti-shake device in the prior art has a complex structure, and the control in different directions is easy to interfere, so that the anti-shake effect is not ideal.
Disclosure of Invention
In order to solve at least one of the above-mentioned technical problems, the present disclosure provides a lens driving device for optical anti-shake and auto-focus, a camera device, and an electronic apparatus.
According to an aspect of the present disclosure, an anti-shake and focusing lens driving device includes:
an auto-focusing section for performing auto-focusing of the lens;
a focusing base for accommodating the auto focusing part;
the Y-direction driving part comprises a Y-direction piezoelectric driving part and a first anti-shake base, the Y-direction piezoelectric driving part drives the focusing base in the Y direction, the first anti-shake base is used for supporting a first ball part, and the first ball part is used for keeping the position of the focusing base and guiding the focusing base to move; and
an X-direction driving part including an X-direction piezoelectric driving part and a second anti-shake base, the X-direction piezoelectric driving part driving the first anti-shake base in the X-direction, the second anti-shake base supporting a second ball part for maintaining a position of the first anti-shake base and guiding the first anti-shake base to move,
the Y-direction piezoelectric driving part comprises a Y-direction friction driving shaft arranged at one outer side face of the focusing base, the Y-direction friction driving shaft is driven to rub with the outer side face of the focusing base through piezoelectric deformation in the Y-direction piezoelectric driving part so as to drive the focusing base to move in the Y direction, the X-direction piezoelectric driving part comprises an X-direction friction driving shaft arranged at one outer side face of the first anti-shake base, the X-direction friction driving shaft is driven to rub with the outer side face of the first anti-shake base through piezoelectric deformation in the X-direction piezoelectric driving part so as to drive the first anti-shake base to move in the X direction, and optical anti-shake of the lens is realized through driving in the Y direction and the X direction.
According to at least one embodiment of the present disclosure, a V-shaped groove is provided on the other outer side surface opposite to the one outer side surface of the focusing base, and a V-shaped groove is provided on one inner side surface of the first anti-shake base opposite to the other outer side surface of the focusing base, wherein two V-shaped grooves are used to guide the movement of the first ball part in the Y direction, and
and a V-shaped groove is arranged on the other outer side surface opposite to the outer side surface of the first anti-shake base, and a V-shaped groove is arranged on one inner side surface of the second anti-shake base opposite to the other outer side surface of the first anti-shake base, wherein the two V-shaped grooves are used for guiding the movement of the second ball part in the X direction.
According to at least one embodiment of the present disclosure, the Y-direction piezoelectric driving part includes a first Y-direction piezoelectric driving part and a second Y-direction piezoelectric driving part, the first Y-direction piezoelectric driving part and the second Y-direction piezoelectric driving part are both provided on one outer side surface of the focusing base, and a Y-direction friction driving shaft of the first Y-direction piezoelectric driving part and a Y-direction friction driving shaft of the second Y-direction piezoelectric driving part are provided facing each other,
the X-direction piezoelectric driving part comprises a first X-direction piezoelectric driving part and a second X-direction piezoelectric driving part, the first X-direction piezoelectric driving part and the second X-direction piezoelectric driving part are both arranged on one outer side face of the first anti-shaking base, and an X-direction friction driving shaft of the first X-direction piezoelectric driving part and an X-direction friction driving shaft of the second X-direction piezoelectric driving part are oppositely arranged.
According to at least one embodiment of the present disclosure, the Y-direction piezoelectric driving part is disposed at 90 ° to the X-direction piezoelectric driving part.
According to at least one embodiment of the present disclosure, the Y-direction piezoelectric driving part further includes a Y-direction fixing member, a Y-direction piezoelectric element, and a Y-direction moving member, one end of the Y-direction fixing member is fixedly connected or integrally formed with the first anti-shake base, the other end of the Y-direction fixing member is connected to one end of the Y-direction piezoelectric element, the other end of the Y-direction piezoelectric element is connected to a Y-direction friction driving shaft, and the Y-direction friction driving shaft is in friction contact with the Y-direction moving member, the Y-direction moving member is fixedly connected or integrally formed with the focusing base, so that the Y-direction friction driving shaft is moved by deformation of the Y-direction piezoelectric element, and the Y-direction moving member is moved by friction of the Y-direction friction driving shaft and the Y-direction moving member, thereby moving the focusing base in the Y direction,
the X-direction piezoelectric driving part also comprises an X-direction fixed part, an X-direction piezoelectric element and an X-direction moving part, one end of the X-direction fixing piece is fixedly connected with or integrally formed with the second anti-shake base, the other end of the X-direction fixing piece is connected with one end of the X-direction piezoelectric element, the other end of the X-direction piezoelectric element is connected with the X-direction friction driving shaft, and the X-direction friction driving shaft is in friction contact with the X-direction moving piece which is fixedly connected with or integrally formed with the first anti-shake base, so as to drive the X-direction friction driving shaft to move through the deformation of the X-direction piezoelectric element, and the X-direction moving piece is driven to move by the friction between the X-direction friction driving shaft and the X-direction moving piece, so that the first anti-shaking base is driven to move in the X direction.
According to at least one embodiment of the present disclosure, the lens driving device further includes a Y-direction detecting permanent magnet disposed on the one outer side surface of the first anti-shake base and located near the Y-direction moving member protruding with respect to the one outer side surface, and a Y-direction detecting hall sensor disposed opposite to the Y-direction detecting permanent magnet and located on the second anti-shake base so as to detect a change in a magnetic field of the Y-direction detecting permanent magnet by the Y-direction hall sensor to obtain a movement of the first anti-shake base in the Y direction,
the lens driving device further comprises an X-direction detection permanent magnet and an X-direction detection Hall sensor, the X-direction detection permanent magnet is arranged on the outer side face of the focusing base and is located near the X-direction moving piece protruding relative to the outer side face, and the X-direction detection Hall sensor is arranged opposite to the X-direction detection permanent magnet and is located on the first anti-shaking base, so that the X-direction Hall sensor is used for detecting the change of the magnetic field of the X-direction detection permanent magnet to obtain the movement of the focusing base in the X direction.
According to at least one embodiment of the present disclosure, when the X-direction driving section drives in one direction of the X-direction in which the X-direction piezoelectric element causes the X-direction friction driving shaft to move slowly, the X-direction piezoelectric element causes the X-direction friction driving shaft to move rapidly in a direction opposite to the one direction,
when the Y-direction driving unit drives in one of the Y directions, the Y-direction piezoelectric element gradually moves the Y-direction friction driving shaft in the one direction, and rapidly moves the Y-direction friction driving shaft in a direction opposite to the one direction.
According to at least one embodiment of the present disclosure, the auto-focusing part includes:
a lens support for accommodating at least one lens;
a permanent magnet for focusing provided on an outer side surface of the lens support portion;
a coil provided on an inner sidewall of the focusing base and at a corresponding position of the permanent magnet for focusing,
when the coil is energized, the lens driving device drives the lens along the optical axis direction of the lens by the magnetic force between the coil and the permanent magnet for focusing, thereby performing automatic focusing.
According to at least one embodiment of the present disclosure, the number of the permanent magnets and the number of the coils for focusing are two, and the first group of the permanent magnets and the coils for focusing and the second group of the permanent magnets and the coils for focusing are provided to face the lens support portion.
According to at least one embodiment of the present disclosure, the lens support unit further includes two sets of guide balls for auto-focusing, and the first set of guide balls for auto-focusing and the second set of guide balls for auto-focusing are provided at two corner positions of the lens support unit with respect to a diagonal line of the lens support unit.
According to at least one embodiment of the present disclosure, each set of the guide balls for auto-focusing includes three guide balls, which are arranged in the optical axis direction of the lens.
According to at least one embodiment of the present disclosure, the guide ball for auto-focusing is located between the lens support part and the focusing base.
According to at least one embodiment of the present disclosure, the lens support part and/or the focusing base is provided with a groove to accommodate the guide ball for auto-focusing, and a margin of one of the grooves corresponding to one of the two sets of guide balls for auto-focusing is greater than a margin of the remaining grooves.
According to another aspect of the present disclosure, a camera apparatus includes the lens driving apparatus as described above.
According to still another aspect of the present disclosure, an electronic apparatus includes the camera device as described above.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic view of a lens driving apparatus according to one embodiment of the present disclosure.
Fig. 2 is a schematic view of a lens driving apparatus according to one embodiment of the present disclosure.
Fig. 3 is a schematic diagram of a lens driving apparatus according to one embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a lens driving apparatus according to one embodiment of the present disclosure.
Fig. 5 is a schematic view of an X/Y direction driving part according to an embodiment of the present disclosure.
Fig. 6 is an X/Y direction drive position displacement diagram according to one embodiment of the present disclosure.
Fig. 7 is a mechanical model diagram of an X/Y direction driving part according to an embodiment of the present disclosure.
Fig. 8 is a schematic diagram of voltage displacement conversion of an X/Y direction driving section according to an embodiment of the present disclosure.
Fig. 9 is a schematic view of a voltage displacement relationship of an X/Y direction driving section according to an embodiment of the present disclosure.
Fig. 10 is a schematic diagram of duty ratio displacement relationship of an X/Y direction driving portion according to an embodiment of the present disclosure.
Fig. 11 is a schematic view of a driving system of an X/Y direction driving part according to an embodiment of the present disclosure.
Fig. 12 is a schematic view of a driving system of an X/Y direction driving part according to an embodiment of the present disclosure.
Fig. 13 is a moving body movement diagram of an X/Y direction driving section according to an embodiment of the present disclosure.
Description of reference numerals:
10 lens driving device
100 auto-focusing part
200 focusing base
300Y-direction driving part
400X direction driving part
110 lens supporting barrel
Permanent magnet for 120 focusing
130 coil
140 FPC
150 guide ball for automatic focusing
310Y direction piezoelectric driving part
320 first anti-shake base
330 first ball part
311Y direction friction driving shaft
312Y direction mounting
313Y-direction piezoelectric element
314Y direction moving member
315Y direction detection permanent magnet
316Y-direction detection Hall sensor
410X-direction piezoelectric driving unit
420 second anti-shake base
430 second ball part
411X direction friction driving shaft
412X direction fixing piece
413X-direction piezoelectric element
414X direction moving member
415X-direction detection permanent magnet
416X direction detection Hall sensor
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. Technical solutions of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the illustrated exemplary embodiments/examples are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Accordingly, unless otherwise indicated, features of the various embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concept of the present disclosure.
The use of cross-hatching and/or shading in the drawings is generally used to clarify the boundaries between adjacent components. As such, unless otherwise noted, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, proportion, commonality between the illustrated components and/or any other characteristic, attribute, property, etc., of a component. Further, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be practiced differently, the specific process sequence may be performed in a different order than that described. For example, two processes described consecutively may be performed substantially simultaneously or in reverse order to that described. In addition, like reference numerals denote like parts.
When an element is referred to as being "on" or "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For purposes of this disclosure, the term "connected" may refer to physically, electrically, etc., and may or may not have intermediate components.
For descriptive purposes, the present disclosure may use spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above," "… …," "higher," and "side (e.g., as in" side walls ") to describe one component's relationship to another (other) component as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of "above" and "below". Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Fig. 1 provides a lens driving apparatus having an optical anti-shake function and an auto-focus function according to one embodiment of the present disclosure. Fig. 2 to 4 show schematic sectional views from above, from right and from below, respectively, of the drive device shown in fig. 1, it being noted that fig. 2 to 4 are not drawn exactly in section in order to show the components clearly.
The lens driving device 10, as shown in fig. 1 to 4, may include an auto focus section 100, a focus base 200, a Y-direction driving section 300, and an X-direction driving section 400.
The auto-focusing section 100 is used to perform auto-focusing of a lens. The auto-focusing part 100 includes a lens support cylinder 110. The lens holding cylinder 110 includes a hollow portion in which at least one lens for photographing is accommodated.
The lens holder 110 is provided with a permanent focusing magnet 120 on the outer side wall, which is the side wall facing the outside of the hollow portion. The inner side wall of the focusing base 200 is provided with a coil 130, wherein the coil 130 is disposed opposite to the permanent magnet 120 for focusing.
When an autofocus operation is required in the optical axis direction of the lens (direction perpendicular to the paper surface in fig. 1), a current is supplied to the coil 130 through the FPC140 (flexible circuit board) 140 to cause the coil 130 to form a magnetic field, so that the magnetic field formed by the coil 130 and the magnetic field of the permanent magnet generate a mutual magnetic field action to cause the lens support to move in the optical axis direction.
As shown in fig. 1, two sets of the permanent magnets 120 for focusing and the coils 130 are provided, respectively on opposite sides. The two sets of permanent magnets 120 and coils 130 for focusing are disposed offset from a straight line perpendicular to the both and passing through the center of the lens holding cylinder 110, that is, the centers of one set of permanent magnets 120 and coils 130 for focusing are disposed on one side of the straight line, and the centers of the other set of permanent magnets 120 and coils 130 for focusing are disposed on the other side of the straight line.
The auto-focusing part 100 further includes a guide ball 150 for auto-focusing, for example, as shown in fig. 1, when two sets of the permanent magnets 120 for focusing and the coils 130 are provided, the guide ball 150 for auto-focusing may include two sets, wherein one set of the guide ball 150 for auto-focusing is located at a corner position of the lens support part near one set of the permanent magnets 120 for focusing and the coils 130, and the other set of the guide ball 150 for auto-focusing is located at a corner position of the lens support part near the other set of the permanent magnets 120 for focusing and the coils 130, wherein the two corners may be located on a diagonal line passing through the center of the lens support barrel 110.
Each set of the guide balls 150 for auto-focusing includes three guide balls arranged in the optical axis direction of the lens. Wherein the size of the middle guide ball may be smaller than the sizes of the upper and lower guide balls for promoting the rolling of the upper and lower guide balls.
The guide ball 150 for auto-focusing is located between the outer side surface of the lens supporting part and the inner side surface of the focus base 200.
The lens support part and/or the focusing base 200 is provided with a groove to accommodate the guide ball 150 for auto-focusing, and the allowance of one of the grooves corresponding to one of the two sets of guide balls 150 for auto-focusing is larger than the allowance of the remaining grooves. The allowance here means how close the groove surrounds the guide ball 150 for automatic focusing, and the closer the surrounding, the smaller the allowance.
By providing two different redundancies, it is advantageous to reduce the mounting accuracy requirement of the components, and if the redundancies of the two guide balls 150 for automatic focusing are small, the mounting accuracy requirement will be increased.
As described above, since the two sets of the permanent magnets 120 for focusing and the coils 130 are disposed to be relatively offset, when the two coils 130 are energized, the magnetic fields of the two coils 130 and the two permanent magnets 120 for focusing act to form a rotational force in a plane perpendicular to the optical axis direction to the lens supporting part, by which the guide ball 150 for auto focusing can be brought into close contact with the lens supporting part and the focusing base 200.
In this way, when the lens support cylinder 110 performs a focusing operation in the optical axis direction, the guide ball 150 for automatic focusing can guide the lens support portion to move relative to the focus base 200.
In addition, in order to detect the moving position of the lens support part in the optical axis direction, a position sensor may be provided at a position corresponding to the focusing permanent magnet 120 on the inner sidewall of the focusing base 200 to detect a change in the magnetic field of the focusing permanent magnet 120, thereby detecting the position of the lens support part, and the current supplied to the coil 130 may be controlled according to the detected position, thereby performing feedback control of auto-focusing.
Although fig. 1 shows a case where the two sets of the permanent magnets 120 for focusing and the coils 130 are provided to face each other, other arrangements may be adopted.
For other arrangements, as an example, a permanent magnet 120 for focusing is provided on an outer sidewall of the lens support part, and a coil 130 is provided at a corresponding position of an inner sidewall of the focusing base 200. The movement of the lens support part with respect to the focus base 200 is controlled by controlling the current supplied to the coil 130, thereby realizing the autofocus control in the Z direction (optical axis direction) perpendicular to the XY direction. Further, the current driving the coil 130 may be supplied through the FPC 140. And the coil 130 may be a loop coil 130, and a position sensor may be provided in a hollow interior of the loop coil 130, and a change in the magnetic field of the permanent magnet for focusing 120 is detected by the position sensor, thereby obtaining movement information in the Z direction.
Two sets of permanent magnets 120 and coils 130 for focusing may be included, a first set of permanent magnets 120 and coils 130 for focusing may be disposed on one side of the lens driving device 10, and a second set of permanent magnets and coils 130 for driving may be disposed on an adjacent side of the lens driving device 10, i.e., in a 90 ° relationship.
Further, the guide ball 150 for auto-focusing may be provided at a corner of the lens support portion and the focusing base 200 where the installation side of the first group of the permanent magnets 120 and the coils 130 for focusing and the installation side of the second group of the permanent magnets 120 and the coils 130 for focusing intersect.
For example, the guide balls 150 for auto-focusing may include a first group of balls and a second group of balls. Each set of balls includes three balls in the optical axis direction, and a groove is provided on the lens supporting part, and a groove is also provided on the inner side surface of the focusing base 200, so that the two grooves cooperate with each other to accommodate the balls. The balls are used to guide the movement in the Z direction.
For example, the two receiving grooves of the first set of balls are substantially V-shaped to match the shape of the balls (up and down balls), while the groove of the lens support portion of the two receiving grooves of the second set of balls is substantially V-shaped to match the shape of the balls, while the groove of the focusing base 200 has a relatively large margin, thus providing a large mounting margin when assembling the balls.
In other words, the first set of balls may make four or more point contacts with the two grooves, while the second set of balls may make three point contacts with the two grooves.
As shown in fig. 1, the Y-direction driving part 300 includes a Y-direction piezoelectric driving part 310 and a first anti-shake base 320. The Y-direction piezoelectric driving unit 310 drives the focus base 200 in the Y-direction, the first anti-shake base 320 supports the first ball unit 330, and the first ball unit 330 holds the position of the focus base 200 and guides the focus base 200 to move.
The Y-direction piezoelectric driving unit 310 includes a Y-direction friction driving shaft 311 provided at one outer side surface of the focus base 200, and the movement of the focus base 200 in the Y direction is driven by the friction of the Y-direction friction driving shaft 311 with the outer side surface of the focus base 200 caused by piezoelectric deformation in the Y-direction piezoelectric driving unit 310, and the optical anti-shake of the lens is realized by the driving in the Y direction.
According to at least one embodiment of the present disclosure, the Y-direction piezoelectric driving part 310 includes a first Y-direction piezoelectric driving part 310 and a second Y-direction piezoelectric driving part 310, the first Y-direction piezoelectric driving part 310 and the second Y-direction piezoelectric driving part 310 are both disposed on one outer side surface of the focus base 200, and a Y-direction friction driving shaft 311 of the first Y-direction piezoelectric driving part 310 and a Y-direction friction driving shaft 311 of the second Y-direction piezoelectric driving part 310 are disposed opposite to each other.
The Y-direction piezoelectric driving part 310 further includes a Y-direction fixing member 312, a Y-direction piezoelectric element 313 and a Y-direction moving member 314, one end of the Y-direction fixing member 312 is fixedly connected or integrally formed with the first anti-shake base 320, the other end of the Y-direction fixing member 312 is connected with one end of the Y-direction piezoelectric element 313, the other end of the Y-direction piezoelectric element 313 is connected with a Y-direction friction driving shaft 311, the Y-direction friction driving shaft 311 is in friction contact with the Y-direction moving member 314, the Y-direction moving member 314 is fixedly connected or integrally formed with the focusing base 200, so that the Y-direction friction driving shaft 311 is moved by deformation of the Y-direction piezoelectric element 313, and the Y-direction moving member 314 is moved by friction between the Y-direction friction driving shaft 311 and the Y-direction moving member 314, thereby.
The lens driving device 10 further includes a Y-direction detecting permanent magnet 315 and a Y-direction detecting hall sensor 316, the Y-direction detecting permanent magnet 315 is disposed on one outer side surface of the first anti-shake base 320 and located near the Y-direction moving member 314 provided to protrude with respect to the one outer side surface, the Y-direction detecting hall sensor 316 is disposed opposite to the Y-direction detecting permanent magnet 315 and located on the second anti-shake base 420, so that a change in the magnetic field of the Y-direction detecting permanent magnet 315 is detected by the Y-direction hall sensor to obtain a movement of the first anti-shake base 320 in the Y direction. The Y-direction detecting permanent magnets 315 may be one in number, i.e., disposed near one of the Y-direction moving members 314.
When the Y-direction driving unit 300 drives in one of the Y directions, the Y-direction piezoelectric element 313 moves the Y-direction friction drive shaft 311 slowly in the one direction, and the Y-direction piezoelectric element 313 moves the Y-direction friction drive shaft 311 rapidly in the direction opposite to the one direction.
A V-shaped groove is provided on the other outer side surface opposite to the one outer side surface of the focus base 200, and a V-shaped groove is provided on the one inner side surface of the first anti-shake base 320 opposite to the other outer side surface of the focus base 200, wherein the two V-shaped grooves are used to guide the movement of the first ball part 330 in the Y direction.
As shown in fig. 1 to 4, the two Y-direction driving portions 300 include a Y-direction fixing member 312, a Y-direction piezoelectric element 313, a Y-direction friction driving shaft 311, and a Y-direction moving member 314. This can realize driving of the focus base 200 in the Y direction by driving the Y-direction piezoelectric element 313. Here, the length direction of the Y-direction friction drive shaft 311 coincides with the Y-direction. In addition, the Y-direction moving member 314 may be integrally formed with the focusing base 200, and the Y-direction fixing member 312 may be integrally formed with the first anti-shake base 320. Further includes a first ball part 330, the first ball part 330 being used to guide the movement of the focus base 200 in the Y direction when controlled by the Y-direction driving part 300, and preventing the rotation in the opposite direction to the Y-direction driving part 300. This is because the balls in the first ball part 330 can be accommodated between the V-shaped groove opened in the outer side surface of the focus base 200 and the V-shaped groove of the inner side surface of the first anti-shake base 320, both the V-shaped grooves extending in the Y-direction and taking a shape > or < in the optical axis direction.
The first ball part 330 may include two balls, each of which is disposed at a side opposite to the Y-direction driving part 300 and spaced apart by a certain distance, and corresponding grooves, so as to provide a stable supporting and guiding function.
Next, the principle of the Y-direction driving unit 300 will be described with reference to fig. 5.
One side of the Y-direction piezoelectric element 313 is fixed to the Y-direction fixing member 312, and the opposite end is connected to the Y-direction friction driving shaft 311. The Y-direction piezoelectric element 313 may be controlled to extend and retract, thereby moving the Y-direction friction driving shaft 311.
Thus, when the Y-direction friction driving shaft 311 is controlled to move, the movement of the Y-direction friction driving shaft 311 causes the movement of the Y-direction moving member 314 by the friction between the two Y-direction moving members 314.
The initial state when the Y-direction piezoelectric element 313 is not controlled is shown in the upper diagram of fig. 5, the extended state when the Y-direction piezoelectric element 313 is controlled to be slowly extended is shown in the middle diagram, and the retracted state after being rapidly retracted from the state of the middle diagram is shown in the lower diagram.
In the middle diagram of fig. 5, the Y-direction friction driving shaft 311 is moved rightward by applying a periodic pulse wave to the Y-direction piezoelectric element 313 to slowly extend the Y-direction friction driving shaft 311, and the Y-direction moving member 314 is also moved rightward by a friction action between the Y-direction friction driving shaft 311 and the Y-direction moving member 314.
When the Y-direction piezoelectric element 313 is controlled to retract rapidly in the lower drawing of fig. 5, the Y-direction friction driving shaft 311 also retracts rapidly leftward, and the Y-direction moving member 314 is held in place although there is friction due to the inertia of the Y-direction moving member 314 moving rightward.
Thus, the Y-direction moving member 314 can be moved to a further position by the repeated actions of slow extension and rapid retraction.
Fig. 6 shows the displacement of the Y-direction piezoelectric element 313 and the Y-direction moving member 314 with time. In which a sawtooth-like displacement of the Y-direction piezoelectric element 313 is shown in fig. 6.
And for the movement of the Y-direction moving member 314 in the opposite direction, the opposite manner to the above-described manner may be performed. The Y-direction piezoelectric element 313 is rapidly extended so that the Y-direction friction driving shaft 311 moves rightward, and then the Y-direction piezoelectric element 313 is slowly retracted so that the Y-direction friction driving shaft 311 moves leftward slowly, and the Y-direction moving member 314 is moved leftward by friction between the Y-direction friction driving shaft 311 and the Y-direction moving member 314. Thus, the rapid extending and slow retracting actions can be repeated, and the Y-direction moving member 314 can move to the left for further displacement.
FIG. 7 showsAnd a physical model of the Y-direction driving unit. Wherein, FpIs a force generated by the piezoelectric element, mp1Is the mass of the piezoelectric element, kpIs the rigidity of the piezoelectric element, mrTo rub the mass of the drive shaft, cpIs the viscosity of the piezoelectric element, mmIs the mass of the moving member. Such that the piezoelectric element has a resonance period wavenumber of
The transfer coefficient between the voltage and the displacement of the piezoelectric element is shown in fig. 8. The voltage waveform required for the sawtooth displacement of the piezoelectric element is obtained by the inverse coefficient (inverse coefficient) of the transfer coefficient.
The result of the voltage waveform obtained by the inverse coefficient-the sawtooth displacement waveform is shown in fig. 9.
① drive cycle wavenumber fdSpecific piezoelectric element resonance period wavenumber fsAt very low voltages of the sawtooth waveform a sawtooth displacement is obtained.
② drive cycle wavenumber fdIs the resonant period wave number f of the piezoelectric elementsAbout 0.4 times of the displacement, the amplitude of the displacement is not changed, but the zigzag shape is deformed.
③ drive cycle wavenumber fdIs the resonant period wave number f of the piezoelectric elementsAbout 0.7 times of the voltage, a sawtooth displacement can be obtained by a symmetrical waveform voltage.
④ drive cycle wavenumber fdNumber of resonance cycles f with piezoelectric elementsWhen the phase is substantially equal, a sawtooth displacement is obtained by a waveform voltage having a large high-order amplitude.
Thus, a voltage waveform of zigzag displacement is obtained, which varies depending on the number of drive cycles due to the influence of the transfer coefficient. And as can be understood from fig. 9, when the number of driving period waves fdIs the resonant period wave number f of the piezoelectric elementsAbout 0.7 times of the above-mentioned voltage, a sawtooth displacement having the same amplitude as that of the voltage can be obtained effectively with a small voltage amplitude.
Then, as shown in FIG. 10, at fd＝0.7fsIn the case of (a) in (b),the amplitude of the sawtooth displacement is larger in the case of the duty ratio of 0.30 than in the case of 0.15 (the low level accounts for 85% and the high level accounts for 15% in the rectangular wave). Further, when the duty ratio is 0.70, a sawtooth displacement in the reverse direction operation can be obtained.
Furthermore, at fd＝0.7fsThe highest moving speed of the moving member can be obtained.
A driving circuit of the piezoelectric element is shown in fig. 11, in which the driving is performed with a rectangular wave in fig. 11. Fig. 11 shows an H-type driving circuit, which drives the piezoelectric element by switching the switching tube.
Fig. 12 shows a driving circuit of the piezoelectric element, in which the phase wave is used for driving in fig. 12. Fig. 12 shows an H-type drive circuit, driving of the piezoelectric element is realized by switching of the switching tube, a voltage waveform is formed in a stepwise manner by a change in switching time of the switching tube, and a displacement waveform similar to a sawtooth wave can be generated.
In the case where a large speed is required, rectangular wave driving shown in fig. 12 is used, and in the case where a large thrust is required, step wave driving shown in fig. 12 is used.
Fig. 13 is a schematic view showing the overall operation of the piezoelectric drive unit. Fig. 13 shows 5 operation states, which are referred to as a, b, c, d, and e in order from top to bottom.
In a, the mobile body is in an initial state.
In b, the piezoelectric element is energized, the piezoelectric element is slowly extended in the arrow direction, the driving shaft is also slowly moved, and the moving body is moved in the arrow direction by the frictional force between the driving shaft and the moving body.
In c, the piezoelectric element contracts rapidly in the direction of the arrow, the drive shaft also moves rapidly, and the moving body remains in place due to inertia.
By performing the operations shown by b and c a plurality of times, the moving body can have a larger stroke to the right.
In d, the piezoelectric element is energized, the piezoelectric element rapidly expands in the direction of the arrow, the drive shaft also rapidly moves, and the moving body remains in place due to inertia.
In e, the piezoelectric element contracts slowly in the direction of the arrow, the drive shaft also moves slowly, and the moving body is moved in the direction of the arrow by the frictional force between the drive shaft and the moving body.
By performing the operations indicated by d and e a plurality of times, the moving body can have a larger stroke to the right.
Next, the X-direction driving section 400 will be explained.
According to at least one embodiment of the present disclosure, the Y-direction piezoelectric driving part 310 is disposed at 90 ° to the X-direction piezoelectric driving part 410, or on an adjacent side surface.
The X-direction driving part 400 includes an X-direction piezoelectric driving part 410 and a second anti-shake base 420. The X-direction piezoelectric driving part 410 drives the first anti-shake base 320 in the X-direction, the second anti-shake base 420 supports the second ball part 430, and the second ball part 430 maintains the position of the first anti-shake base 320 and guides the first anti-shake base 320 to move.
The X-direction piezoelectric driving part 410 includes an X-direction friction driving shaft 411 provided at one outer side surface of the first anti-shake base 320, and drives the movement of the first anti-shake base 320 in the X-direction by driving the X-direction friction driving shaft 411 to rub against the outer side surface of the first anti-shake base 320 through piezoelectric deformation in the X-direction piezoelectric driving part 410, and optical anti-shake of the lens is realized through driving in the Y-direction and the X-direction.
A V-shaped groove is provided on the other outer side surface opposite to the one outer side surface of the first anti-shake base 320, and a V-shaped groove is provided on the one inner side surface of the second anti-shake base 420 opposite to the other outer side surface of the first anti-shake base 320, wherein the two V-shaped grooves are used to guide the movement of the second ball part 430 in the X direction.
The X-direction piezoelectric driving part 410 includes a first X-direction piezoelectric driving part 410 and a second X-direction piezoelectric driving part 410, the first X-direction piezoelectric driving part 410 and the second X-direction piezoelectric driving part 410 are both provided on one outer side surface of the first anti-shake base 320, and an X-direction friction driving shaft 411 of the first X-direction piezoelectric driving part 410 and an X-direction friction driving shaft 411 of the second X-direction piezoelectric driving part 410 are provided opposite to each other.
According to at least one embodiment of the present disclosure, the X-direction piezoelectric driving part 410 further includes an X-direction fixing member 412, an X-direction piezoelectric element 413, and an X-direction moving member 414, one end of the X-direction fixing member 412 is fixedly connected or integrally formed with the second anti-shake base 420, the other end of the X-direction fixing member 412 is connected to one end of the X-direction piezoelectric element 413, the other end of the X-direction piezoelectric element 413 is connected to the X-direction friction driving shaft 411, and the X-direction friction driving shaft 411 is in friction contact with the X-direction moving member 414, the X-direction moving member 414 is fixedly connected to or integrally formed with the first anti-shake base 320, so that the X-direction friction driving shaft 411 is moved by the deformation of the X-direction piezoelectric element 413, and the friction between the X-direction friction driving shaft 411 and the X-direction moving member 414 drives the X-direction moving member 414 to move, so as to drive the first anti-shake base 320 to move in the X-direction.
The lens driving device 10 further includes an X-direction detecting permanent magnet 415 disposed on one outer side surface of the focus base 200 and located near the X-direction moving member 414 provided to protrude with respect to the one outer side surface, and an X-direction detecting hall sensor 416 disposed opposite to the X-direction detecting permanent magnet 415 and located on the first anti-shake base 320 so as to detect a change in magnetic field of the X-direction detecting permanent magnet 415 by the X-direction hall sensor to obtain movement of the focus base 200 in the X direction. The number of the X-direction detecting permanent magnets 415 may be one, that is, provided near one of the X-direction moving members 414.
According to at least one embodiment of the present disclosure, when the X-direction driving part 400 drives in one direction of the X-direction, in which the X-direction piezoelectric element 413 causes the X-direction friction driving shaft 411 to move slowly, in the opposite direction to the one direction, the X-direction piezoelectric element 413 causes the X-direction friction driving shaft 411 to move rapidly,
this is because the balls in the second ball part 430 can be accommodated between the V-shaped groove opened in the outer side surface of the focus base 200 and the V-shaped groove of the inner side surface of the first anti-shake base 320, both V-shaped grooves extending in the X direction and taking a shape > or < in the optical axis direction.
The second ball part 430 may include two balls, each of which is disposed at a side opposite to the X-direction driving part 400, and corresponding grooves, and spaced apart by a certain distance so as to provide a stable supporting and guiding function.
One side of the X-direction piezoelectric element 413 is fixed to the X-direction fixing member 412, and the other opposite end is connected to the X-direction friction driving shaft 411. The X-direction piezoelectric element 413 can be controlled to extend and retract, thereby moving the X-direction friction driving shaft 411.
Thus, when the X-direction friction driving shaft 411 is controlled to move, the movement of the X-direction friction driving shaft 411 drives the movement of the X-direction moving member 414 by the friction action between the two X-direction moving members 414.
In addition, the specific control manner of the X-direction driving portion 400 is the same as that of the Y-direction driving portion 300, and specific reference is made to the above description about fig. 5 to 12, which is not repeated herein.
In the present disclosure, since the autofocus control and the optical anti-shake control are directed to different components, the two controls may be independent without interfering with each other.
In addition, in the present disclosure, the two piezoelectric driving devices are used for push-pull driving in the X-axis direction and the Y-axis direction, respectively, so that the driving force and the driving speed of the optical anti-shake can be increased, and the positional accuracy and the like can also be improved.
Further, by providing the holding mechanisms for the respective balls on the opposite side of the piezoelectric driving device, it is possible to realize stable attitude control of the lens holding cylinder 110, and to reduce the thickness dimension of the driving device itself, and also to reduce the number of parts, thereby reducing the cost and the like.
According to still another aspect of the present disclosure, there is provided a camera apparatus including the lens driving apparatus 10 as above.
According to yet another aspect of the present disclosure, there is provided an electronic apparatus including the camera device as described above.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (10)
1. An anti-shake and focusing lens driving device, comprising:
an auto-focusing section for performing auto-focusing of the lens;
a focusing base for accommodating the auto focusing part;
the Y-direction driving part comprises a Y-direction piezoelectric driving part and a first anti-shake base, the Y-direction piezoelectric driving part drives the focusing base in the Y direction, the first anti-shake base is used for supporting a first ball part, and the first ball part is used for keeping the position of the focusing base and guiding the focusing base to move; and
an X-direction driving part including an X-direction piezoelectric driving part and a second anti-shake base, the X-direction piezoelectric driving part driving the first anti-shake base in the X-direction, the second anti-shake base supporting a second ball part for maintaining a position of the first anti-shake base and guiding the first anti-shake base to move,
the Y-direction piezoelectric driving part comprises a Y-direction friction driving shaft arranged at one outer side face of the focusing base, the Y-direction friction driving shaft is driven to rub with the outer side face of the focusing base through piezoelectric deformation in the Y-direction piezoelectric driving part so as to drive the focusing base to move in the Y direction, the X-direction piezoelectric driving part comprises an X-direction friction driving shaft arranged at one outer side face of the first anti-shake base, the X-direction friction driving shaft is driven to rub with the outer side face of the first anti-shake base through piezoelectric deformation in the X-direction piezoelectric driving part so as to drive the first anti-shake base to move in the X direction, and optical anti-shake of the lens is realized through driving in the Y direction and the X direction.
2. The lens driving apparatus as claimed in claim 1,
a V-shaped groove is provided on the other outer side surface opposite to the one outer side surface of the focusing base, and a V-shaped groove is provided on one inner side surface of the first anti-shake base opposite to the other outer side surface of the focusing base, wherein two V-shaped grooves are used for guiding the movement of the first ball part in the Y direction, and
and a V-shaped groove is arranged on the other outer side surface opposite to the outer side surface of the first anti-shake base, and a V-shaped groove is arranged on one inner side surface of the second anti-shake base opposite to the other outer side surface of the first anti-shake base, wherein the two V-shaped grooves are used for guiding the movement of the second ball part in the X direction.
3. The lens driving apparatus according to claim 1 or 2,
the Y-direction piezoelectric driving part comprises a first Y-direction piezoelectric driving part and a second Y-direction piezoelectric driving part, the first Y-direction piezoelectric driving part and the second Y-direction piezoelectric driving part are both arranged on one outer side surface of the focusing base, and a Y-direction friction driving shaft of the first Y-direction piezoelectric driving part and a Y-direction friction driving shaft of the second Y-direction piezoelectric driving part are oppositely arranged,
the X-direction piezoelectric driving part comprises a first X-direction piezoelectric driving part and a second X-direction piezoelectric driving part, the first X-direction piezoelectric driving part and the second X-direction piezoelectric driving part are both arranged on one outer side face of the first anti-shaking base, and an X-direction friction driving shaft of the first X-direction piezoelectric driving part and an X-direction friction driving shaft of the second X-direction piezoelectric driving part are oppositely arranged.
4. The lens driving device according to claim 3, wherein the Y-direction piezoelectric driving portion is disposed at 90 ° to the X-direction piezoelectric driving portion.
5. The lens driving apparatus according to any one of claims 1 to 4,
the Y-direction piezoelectric driving part further comprises a Y-direction fixing part, a Y-direction piezoelectric element and a Y-direction moving part, one end of the Y-direction fixing part is fixedly connected with or integrally formed with the first anti-shake base, the other end of the Y-direction fixing part is connected with one end of the Y-direction piezoelectric element, the other end of the Y-direction piezoelectric element is connected with a Y-direction friction driving shaft, the Y-direction friction driving shaft is in friction contact with the Y-direction moving part, the Y-direction moving part is fixedly connected with or integrally formed with the focusing base, so that the Y-direction friction driving shaft is driven to move through the deformation of the Y-direction piezoelectric element, and the Y-direction moving part is driven to move through the friction between the Y-direction friction driving shaft and the Y-direction moving part, so that the focusing base is,
the X-direction piezoelectric driving part also comprises an X-direction fixed part, an X-direction piezoelectric element and an X-direction moving part, one end of the X-direction fixing piece is fixedly connected with or integrally formed with the second anti-shake base, the other end of the X-direction fixing piece is connected with one end of the X-direction piezoelectric element, the other end of the X-direction piezoelectric element is connected with the X-direction friction driving shaft, and the X-direction friction driving shaft is in friction contact with the X-direction moving piece which is fixedly connected with or integrally formed with the first anti-shake base, so as to drive the X-direction friction driving shaft to move through the deformation of the X-direction piezoelectric element, and the X-direction moving piece is driven to move by the friction between the X-direction friction driving shaft and the X-direction moving piece, so that the first anti-shaking base is driven to move in the X direction.
6. The lens driving apparatus according to any one of claims 1 to 5,
the lens driving device further includes a Y-direction detection permanent magnet disposed on the one outer side surface of the first anti-shake base and located near the Y-direction moving member protruding with respect to the one outer side surface, and a Y-direction detection hall sensor disposed opposite to the Y-direction detection permanent magnet and located on the second anti-shake base so as to detect a change in a magnetic field of the Y-direction detection permanent magnet by the Y-direction hall sensor to obtain a movement of the first anti-shake base in the Y direction,
the lens driving device further comprises an X-direction detection permanent magnet and an X-direction detection Hall sensor, the X-direction detection permanent magnet is arranged on the outer side face of the focusing base and is located near the X-direction moving piece protruding relative to the outer side face, and the X-direction detection Hall sensor is arranged opposite to the X-direction detection permanent magnet and is located on the first anti-shaking base, so that the X-direction Hall sensor is used for detecting the change of the magnetic field of the X-direction detection permanent magnet to obtain the movement of the focusing base in the X direction.
7. The lens driving apparatus according to any one of claims 1 to 6,
when the X-direction driving unit drives in one of X-directions in which the X-direction piezoelectric element causes the X-direction friction driving shaft to move slowly, and in a direction opposite to the one direction, the X-direction piezoelectric element causes the X-direction friction driving shaft to move rapidly,
when the Y-direction driving unit drives in one of the Y directions, the Y-direction piezoelectric element gradually moves the Y-direction friction driving shaft in the one direction, and rapidly moves the Y-direction friction driving shaft in a direction opposite to the one direction.
8. The lens driving apparatus according to any one of claims 1 to 7, wherein the auto-focusing section includes:
a lens support for accommodating at least one lens;
a permanent magnet for focusing provided on an outer side surface of the lens support portion;
a coil provided on an inner sidewall of the focusing base and at a corresponding position of the permanent magnet for focusing,
when the coil is energized, the lens driving device drives the lens along the optical axis direction of the lens by the magnetic force between the coil and the permanent magnet for focusing, thereby performing automatic focusing.
9. A camera apparatus comprising the lens driving apparatus as claimed in any one of claims 1 to 8.
10. An electronic device comprising the camera apparatus of claim 9.
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| CN202010282575.2A CN111474671A (en) | 2020-04-12 | 2020-04-12 | Anti-shake and focusing lens drive device, camera device, and electronic apparatus |
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| CN202010282575.2A CN111474671A (en) | 2020-04-12 | 2020-04-12 | Anti-shake and focusing lens drive device, camera device, and electronic apparatus |
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Application publication date: 20200731 |