CN117849978B - Periscope type long-stroke focusing motor - Google Patents
Periscope type long-stroke focusing motor Download PDFInfo
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- CN117849978B CN117849978B CN202410251753.3A CN202410251753A CN117849978B CN 117849978 B CN117849978 B CN 117849978B CN 202410251753 A CN202410251753 A CN 202410251753A CN 117849978 B CN117849978 B CN 117849978B
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- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of optical anti-shake, in particular to a periscope type long-stroke focusing motor which comprises a fixed part, a focusing movable part and a focusing driving part; the fixed part comprises an outer cover and a base which are covered, the focusing movable part comprises a lens bearing and a ball group, the lens bearing is arranged in the base, and a circulating ball groove and a ball wire groove which are matched are arranged at the bottom of the lens bearing and the bottom of the base; therefore, the ball groove is designed into the circulating ball groove to be matched with the ball groove, so that when the lens focuses or zooms along the optical axis direction, the ball group circularly rolls in the circulating ball groove, the circulating ball groove has no length limit or end point for the ball group, and the problems of focusing and zooming failure caused by focusing, zooming stroke limit or ball clamping caused by limiting the rolling stroke of the ball by the length or end point of the conventional ball groove in the prior art are avoided.
Description
Technical Field
The invention relates to the technical field of optical anti-shake, in particular to a periscope type long-stroke focusing motor.
Background
The shooting function of the camera of the existing electronic equipment is stronger and larger, the conventional shooting lens can only shoot images of close range (1-10 meters), and if clear shooting is required to be carried out aiming at distant range (10-50 meters), the lens must have a distant shooting or zooming function. However, such lenses often require a long stroke to realize zooming, resulting in a relatively long total length of the lens, and a lens height exceeding the thickness of the electronic device, which is difficult to meet the requirements of light and thin or slim mobile terminal devices.
In this regard, a periscope type design as shown in fig. 1 is generally adopted, that is, the optical path is designed to lie flat, and a turning mirror is added to rotate the optical path by 90 degrees, so that the whole optical system is laid flat to reduce the whole height, and the focusing or zooming is completed by matching with a focusing motor. However, in the focusing process of the conventional periscope lens, most of focusing motors adopt a form that balls are matched with ball grooves to enable the lens to move, the volume of the whole motor is limited, the ball grooves are limited in length, meanwhile, the balls are displaced, when reaching the starting point or the end point of the ball grooves, the phenomenon of ball clamping can be generated, and the problems of short focusing or zooming stroke and failure are caused.
It should be noted that the information disclosed in this background section is only for the purpose of increasing the understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a periscope type long-stroke motor which comprises a fixed part, a focusing movable part and a focusing driving part.
The fixing part comprises an outer cover and a base which are covered with each other.
The movable focusing part comprises a lens bearing and a ball group, the lens bearing is arranged in the base, the lens bearing is movably connected with the base, a lens is arranged in the lens bearing, at least two circulating ball grooves are formed in one side of the lens bearing, which faces the base, of the lens bearing, the ball group is located in the two circulating ball grooves and can circularly roll in the circulating ball grooves, a ball wire groove matched with the circulating ball grooves is formed in the bottom of the base, and the ball group is movably connected with the ball wire groove.
The focusing driving part is arranged between the base and the lens bearing seat and comprises a coil and a magnet, wherein the coil is attached to the inner wall of the base, and the magnet is fixed on the lens bearing seat and corresponds to the coil in position.
Further, the periscope type long-stroke focusing motor further comprises a magnetic conduction bottom plate, the magnetic conduction bottom plate is arranged at the bottom of the base and located between the base and the lens bearing seat, the ball wire groove is located on the magnetic conduction bottom plate, and the ball wire groove is in rolling connection with the ball group.
Further, the length of the ball wire groove is equal to the length of the magnetic conduction bottom plate.
Further, the focusing movable part further comprises a magnetic conduction sheet, the magnetic conduction sheet is attached to the lens bearing, one end of the magnetic conduction sheet is arranged between the lens bearing and the magnet, and the other end of the magnetic conduction sheet is arranged between the lens bearing and the magnetic conduction bottom plate.
Further, the center point of the circulating ball groove and the center point of the lens holder are positioned on the same horizontal straight line perpendicular to the optical axis.
Further, the circulating ball groove comprises a stress groove, a first circulating groove and a second circulating groove, wherein the diameter of the stress groove is equal to or smaller than the diameter of the ball group, the diameter of the first circulating groove and the diameter of the second circulating groove are larger than the diameter of the ball group, and the depth of the second circulating groove is larger than the depth of the first circulating groove.
Further, the track direction of the ball slot is consistent with the track direction of the stress slot and the optical axis direction of the lens.
Further, the length of the stress grooveThe expression is as follows:
Wherein L is the length of the lens holder.
Further, the circulating ball groove is an elliptical circulating ball groove.
Further, a buffer member is arranged on the lens holder.
Based on the above, compared with the prior art, the periscope type long-stroke focusing motor provided by the invention has the advantages that the ball grooves are designed to be the circulating ball grooves, and the ball grooves are matched, so that when a lens focuses or zooms along the optical axis direction, the ball group circularly rolls in the circulating ball grooves, the circulating ball grooves have no end points for the ball group, and the problems of focusing and zooming failure caused by focusing, zooming stroke limitation or ball clamping caused by the fact that the conventional ball grooves have the ball moving to the end points in the prior art are avoided.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities particularly pointed out in the specification and the like.
Drawings
For a clearer description of embodiments of the invention or of the solutions of the prior art, a brief description will be given below of the drawings that are needed in the description of the embodiments or of the prior art, it being obvious that the drawings in the description below are some embodiments of the invention, from which other drawings can be obtained, without the aid of inventive labour, for a person skilled in the art; in the following description, the positional relationship described in the drawings is based on the orientation of the components shown in the drawings unless otherwise specified.
FIG. 1 is a schematic view of a periscope lens of the prior art;
FIG. 2 is a schematic diagram of a periscope type long-stroke focusing motor according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an explosion structure of a periscope type long-travel focusing motor according to an embodiment of the invention;
FIG. 4 is a cross-sectional view at A-A in FIG. 2;
FIG. 5 is a cross-sectional view at B-B in FIG. 2;
FIG. 6 is a schematic view of a circulating ball groove according to an embodiment of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 4 at E;
FIG. 8 is an enlarged view of a portion of F in FIG. 5;
FIG. 9 is a schematic diagram illustrating a movement of a ball group on a lens holder during focusing of a periscope type long-stroke focusing motor according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating a movement of a ball group on a magnetically conductive base plate during focusing of a periscope type long-stroke focusing motor according to an embodiment of the present invention;
the marks in the figure:
10-a fixing part; 20-focusing movable part; 30-a circulating ball groove; 40-ball wire grooves; 50-a focusing driving part; 60-a magnetic conduction bottom plate; a 70-drive IC chip; 80-magnetic conductive sheets; 90-cushioning member; 11-an outer cover; 12-a base; 21-a lens holder; 22-ball group; 23-lens; 31-a stress groove; 32-a first circulation tank; 33-a second circulation tank; 51-coil; 52-magnetite;
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention; the technical features designed in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or components referred to must have a specific orientation or be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. In addition, the term "comprising" and any variations thereof are meant to be "at least inclusive".
Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of a periscope type long-stroke focusing motor according to an embodiment of the invention; fig. 3 is an exploded view of a periscope type long-range focusing motor according to an embodiment of the invention.
To achieve at least one of the advantages and other advantages, an embodiment of the present invention provides a periscope type long-stroke focusing motor. As shown in fig. 2 and 3, the periscope type long-stroke focusing motor includes: a fixed part 10, a focus movable part 20, and a focus driving part 50.
The fixing portion 10 includes an outer cover 11 and a base 12 which are covered with each other. In practice, signal and power lines are embedded in the base 12 in advance, so as to facilitate the control of the coil 51 and the driving IC chip 70, and also facilitate the assembly of the finished product.
The focusing movable part 20 includes a lens holder 21 and a ball group 22, the lens holder 21 is disposed in the base 12, and the lens holder 21 is movably connected to the base 12. The lens holder 21 is provided with a lens 23. At least two circulating ball grooves 30 are formed in the lens holder 21 on the side facing the base 12, and the ball group 22 is located in the two circulating ball grooves 30 and can circulate in the circulating ball grooves 30. The bottom of the base 12 is provided with a ball slot 40 matched with the circulating ball slot 30, and the ball group 22 is movably connected with the ball slot 40.
In specific implementation, the ball groups 22 are uniformly and tightly arranged in the circulating ball groove 30, the circulating ball groove 30 is matched with the ball wire groove 40, the ball groups 22 are limited in the circulating ball groove 30, deviation or displacement of the ball groups 22 is avoided, when focusing and zooming are performed, the lens bearing seat 21 moves positively or negatively along the direction of the optical axis Z to drive the ball groups 22 to circularly roll in the circulating ball groove 30, and at this time, the circulating ball groove 30 has no length limitation on the ball groups 22.
It can be understood that the ball group 22 is composed of a plurality of balls with equal diameters, and when the ball group 22 circulates in the circulating ball groove 30, the supporting of the lens holder 21 by the balls is consistent, so that the lens holder 21 is always in a stable lateral movement state, and the unstable lens holder 21 caused by different diameters of the balls is avoided.
Specifically, in the prior art, the conventional motor is provided with a ball slot and is matched with a ball, besides the length limitation and the end point of the ball slot, when the motor does not focus, the ball can displace in the ball slot, the probability that the ball appears at the end point of the ball slot is further increased, and the probability of focusing or zooming failure is greatly improved.
The circulating ball groove 30 is preferably an elliptical circulating ball groove, but the present invention is not limited thereto, and other circulating ball grooves such as rounded rectangular or other shapes may be used, and the present invention is not limited thereto.
In this embodiment, for convenience of explanation, the number of the circulating ball grooves 30 is two, and the two circulating ball grooves 30 are designed symmetrically, in practical implementation, the number of the circulating ball grooves can be designed according to practical needs, and the setting positions of the circulating ball grooves 30 can be adjusted according to the number, so long as the ball group 22 can stably support the lens holder 21 and have a stable movement effect, which is not limited in this case.
For example, when the number of the circulating ball grooves 30 is 3, the positions of the circulating ball grooves 30 may be two on the left side and two on the right side, and the three circulating ball grooves 30 are symmetrically designed up and down along the center point D of the lens holder 21, so as to ensure the stability of the lens holder 21 and the stability during the movement.
The focus driving portion 50 is disposed between the base 12 and the lens holder 21. The focusing driving part 50 includes a coil 51 and a magnet 52, a notch is formed in an inner wall of one side of the base 12, the notch is formed at a position corresponding to a signal and a power line buried in the base 12 in advance, the coil 51 is attached to the notch, a driving IC chip 70 is attached to an inner side of the coil 51, and the coil 51 is electrically connected with the driving IC chip 70 and the signal and the power line buried in the base 12 in advance.
The magnet 52 is fixed on the lens holder 21, and the fixed position of the magnet 52 corresponds to the position of the coil 51.
In particular, when the coil 51 is energized to generate a magnetic field, the magnetic field reacts with the magnetic field of the magnet 52, so that the position of the magnet 52 is shifted, and the lens holder 21 is driven to move positively or negatively along the direction of the optical axis Z, thereby achieving the purpose of focusing or zooming.
It should be noted that, in this embodiment, the focusing driving portion 50 adopts a unilateral moving magnetic circuit structure, i.e. the coil 51 is used as a fixing member, and is fixed on the base 12, the magnet 52 is used as a moving member, and is fixed on the lens holder 21, and the base 12 is embedded with signal and power lines in advance, so that the focusing driving portion can be directly connected with the coil 51, thereby avoiding complex connection lines, facilitating automatic assembly, and avoiding line pulling phenomenon caused in the moving process of the conventional coil 51 as a moving member, and the base 12 is not provided with other side walls of the coil 51, so that magnetic interference to other motors around can be avoided in the environment of highly integrated mobile terminal equipment.
Referring to fig. 4 and 5 in conjunction with fig. 3, in some preferred embodiments, as shown in the drawings, the periscope type long travel focusing motor further includes a magnetically permeable base plate 60 and a magnetically permeable sheet 80.
The magnetic conductive bottom plate 60 is fixed at the bottom of the base 12 and located between the base 12 and the lens holder 21, and the ball slot 40 is formed on the magnetic conductive bottom plate 60. Preferably, the length G of the ball slot 40 is equal to the length G of the magnetic conductive bottom plate, so that the movement stroke of the lens holder 21 is prevented from being limited by the length of the ball slot 40.
On the basis of the above, the cross section of the ball slot 40 is wave-like, that is, the corners of the two sides of the ball slot 40 are rounded, so that the rolling of the ball group 22 between the circulating ball slot 30 and the ball slot 40 is smoother.
The magnetic sheet 80 is attached to the lens holder 21, one end of the magnetic sheet 80 is disposed between the lens holder 21 and the magnet 52, and the other end of the magnetic sheet 80 is disposed between the lens holder 21 and the magnetic base plate 60.
In particular, one end of the magnetic conductive sheet 80 contacts the magnet 52, and the magnetic conductive sheet 80 is magnetized to generate magnetism, so that a magnetic attraction force is generated between the magnetic conductive sheet 80 and the magnetic conductive base plate 60, so that the focusing movable part 20 is firmly attracted to the magnetic conductive base plate 60 in any posture, and the problem of derailment of the ball group 22 caused by the offset of the focusing movable part 20 is avoided.
It will be appreciated that the thrust generated by the interaction of the magnetic fields between the coil 51 and the magnet 52 must be greater than the magnetic attraction between the magnetically permeable sheet 80 and the magnetically permeable base plate 60 to ensure that the motor is able to focus or zoom normally.
Specifically, in the downward posture (with the focusing movable part 20 down, the base 12 is up), if vibration occurs, a force approximately equal to 10 times the weight of the focusing movable part 20 itself is generated to separate the base 12 from the focusing movable part 20, and in order to avoid the shifting or displacement of the focusing movable part 20, the magnetic attraction force between the magnetic conductive sheet 80 and the magnetic conductive base plate 60 is 10 to 40 times the weight of the focusing movable part 20 itself. In consideration of the volume and cost of the focus driving section 50, it is preferably 10 times.
In some preferred embodiments, as shown in fig. 6, the center point D of the circulating ball groove 30 and the center point D of the lens holder 21 are on the same horizontal line perpendicular to the optical axis Z, so as to ensure that the ball group 22 is uniformly supported on the lens holder 21 during the movement of the lens holder 21, and avoid instability caused by uneven support of the lens holder 21 before and after the center point D.
Referring to fig. 7 and 8 in combination with fig. 6, in some preferred embodiments, the recirculating ball groove 30 includes a force receiving groove 31, a first recirculating groove 32, and a second recirculating groove 33. The diameter W1 of the force receiving groove 31 is equal to or smaller than the diameter W of the ball group 22, the diameter W2 of the first circulation groove 32 and the diameter W3 of the second circulation groove 33 are larger than the diameter W of the ball group 22, and the depth h2 of the second circulation groove 33 is larger than the depth h1 of the first circulation groove 32.
In particular, since the diameter W1 of the force receiving groove 31 is equal to or smaller than the diameter W of the ball group 22, the balls in the force receiving groove 31 are forced to support the lens holder 21, the diameter W2 of the first circulation groove 32 and the diameter W3 of the second circulation groove 33 are larger than the diameter W of the ball group 22, the balls in the first circulation groove 32 and the second circulation groove 33 are not forced, and the depth h2 of the second circulation groove 33 is larger than the depth h1 of the first circulation groove 32, so that the balls can circulate between the force receiving groove 31 and the first circulation groove 32 through the second circulation groove 33.
As shown in fig. 9 and 10, when the lens holder 21 moves positively or negatively along the direction of the optical axis Z, the balls in the force-bearing groove 31 are driven to roll, and the balls in the force-bearing groove 31 push the balls in the first circulation groove 32 and the second circulation groove 33, so that the ball group 22 circularly rolls in the circulation ball groove 30, and the situation of focusing or zooming failure is avoided when the balls in the conventional ball groove move to the end point.
In some preferred embodiments, the ball grooves 40 coincide with the track direction of the force-receiving grooves 31 and the direction of the optical axis Z of the lens 23 to ensure that the lens holder 21 can perform stable positive or negative movement in the direction of the optical axis Z.
In some preferred embodiments, the length of the force-receiving slotThe expression is as follows:
Wherein L is the length of the lens holder. So as to ensure the supporting force and the supporting length of the ball in the stress groove to the lens holder 21 in the process of moving the lens holder 21, and avoid unstable movement or deviation of the lens holder 21 caused by short supporting length.
In some preferred embodiments, the lens holder 21 is provided with a buffer 90, and in practice, the buffer is disposed on the lens holder 21 front and back along the direction of the optical axis Z, and the front and back sides are the same in number, so as to absorb the impact force between the lens holder 21 and the base 12.
In summary, compared with the prior art, the periscope type long-stroke focusing motor provided by the invention has the advantages that the ball grooves are designed to be the circulating ball grooves, and the ball grooves are matched, so that when a lens focuses or zooms along the optical axis direction, the ball group circularly rolls in the circulating ball grooves, the circulating ball grooves have no end points for the ball group, and the problems of focusing and zooming failure caused by focusing, zooming stroke limitation or ball clamping caused by the fact that the conventional ball grooves have the ball moving to the end points in the prior art are avoided.
In addition, it should be understood by those skilled in the art that although there are many problems in the prior art, each embodiment or technical solution of the present invention may be modified in only one or several respects, without having to solve all technical problems listed in the prior art or the background art at the same time. Those skilled in the art will understand that nothing in one claim should be taken as a limitation on that claim.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The utility model provides a periscope formula long stroke focusing motor which characterized in that: the periscope type long-stroke focusing motor comprises:
the fixing part comprises an outer cover and a base which are covered with each other;
The movable focusing part comprises a lens bearing seat and a ball group, the lens bearing seat is arranged in the base, the lens bearing seat is movably connected with the base, a lens is arranged in the lens bearing seat, at least two circulating ball grooves are formed in one side, facing the base, of the lens bearing seat, the ball group is positioned in the two circulating ball grooves and can circularly roll in the circulating ball grooves, a ball wire groove matched with the circulating ball grooves is formed in the bottom of the base, and the ball group is movably connected with the ball wire groove;
The focusing driving part is arranged between the base and the lens bearing seat, the focusing driving part comprises a coil and a magnet, the coil is attached to the inner wall of the base, and the magnet is fixed on the lens bearing seat and corresponds to the position of the coil;
The circulating ball grooves comprise a stress groove, a first circulating groove and a second circulating groove, the diameter of the stress groove is equal to or smaller than that of the ball group, the diameter of the first circulating groove and the diameter of the second circulating groove are larger than that of the ball group, and the depth of the second circulating groove is larger than that of the first circulating groove;
The length of the stress groove The expression is as follows:
Wherein L is the length of the lens holder.
2. The periscope type long-stroke focusing motor according to claim 1, characterized in that: the periscope type long-stroke focusing motor further comprises a magnetic conduction bottom plate, the magnetic conduction bottom plate is arranged at the bottom of the base and located between the base and the lens bearing seat, the ball wire groove is located on the magnetic conduction bottom plate, and the ball wire groove is in rolling connection with the ball group.
3. The periscope type long-stroke focusing motor according to claim 2, characterized in that: the length of the ball wire slot is equal to that of the magnetic conduction bottom plate.
4. The periscope type long-stroke focusing motor according to claim 2, characterized in that: the focusing movable part further comprises a magnetic conduction sheet, the magnetic conduction sheet is fixed on the lens bearing, one end of the magnetic conduction sheet is arranged between the lens bearing and the magnet and is close to the magnet, and the other end of the magnetic conduction sheet is arranged between the lens bearing and the magnetic conduction bottom plate.
5. The periscope type long-stroke focusing motor according to claim 1, characterized in that: the center point of the circulating ball groove and the center point of the lens bearing seat are positioned on the same horizontal straight line perpendicular to the optical axis.
6. The periscope type long-stroke focusing motor according to claim 1, characterized in that: the track direction of the ball wire groove is consistent with the track direction of the stress groove and the optical axis direction of the lens.
7. The periscope type long-stroke focusing motor according to claim 1, characterized in that: the circulating ball groove is an elliptic circulating ball groove.
8. The periscope type long-stroke focusing motor according to claim 1, characterized in that: the lens bearing seat is provided with a buffer piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410251753.3A CN117849978B (en) | 2024-03-06 | 2024-03-06 | Periscope type long-stroke focusing motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410251753.3A CN117849978B (en) | 2024-03-06 | 2024-03-06 | Periscope type long-stroke focusing motor |
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| CN117849978A CN117849978A (en) | 2024-04-09 |
| CN117849978B true CN117849978B (en) | 2024-05-07 |
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| CN117849978A (en) | 2024-04-09 |
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