阅读说明：本技术 光学元件驱动装置 (Optical element driving device ) 是由 鲍和平 彭坤 林聪� 刘富泉 吕新科 汪仁德 于 2021-08-27 设计创作，主要内容包括：本发明公开了一种光学元件驱动装置,包括框架、第一载体、第二载体以及驱动第一载体的第一电磁驱动机构和驱动第二载体的第二电磁驱动机构,第一载体和第二载体设置于框架内并用于安装至少两个光学元件,第一载体沿轴向设有第一光学元件安装部和载体安装部,第二载体可活动地安装于载体安装部内,第一电磁驱动机构设置于第一载体与框架之前以驱动第一载体相对于框架运动,第二电磁驱动机构设置于第一载体和第二载体之间以驱动第二载体相对于第一载体运动。本发明的光学元件驱动装置能够在取得更大变焦范围的同时,整体上降低光学元件电磁驱动机构的体积。(The invention discloses an optical element driving device which comprises a frame, a first carrier, a second carrier, a first electromagnetic driving mechanism and a second electromagnetic driving mechanism, wherein the first electromagnetic driving mechanism is used for driving the first carrier, the second electromagnetic driving mechanism is used for driving the second carrier, the first carrier and the second carrier are arranged in the frame and are used for installing at least two optical elements, the first carrier is axially provided with a first optical element installing part and a carrier installing part, the second carrier is movably arranged in the carrier installing part, the first electromagnetic driving mechanism is arranged in front of the first carrier and the frame and is used for driving the first carrier to move relative to the frame, and the second electromagnetic driving mechanism is arranged between the first carrier and the second carrier and is used for driving the second carrier to move relative to the first carrier. The optical element driving device of the invention can obtain a larger zooming range and simultaneously reduce the volume of an electromagnetic driving mechanism of the optical element on the whole.)

1. An optical element driving apparatus, comprising a frame, a first carrier, a second carrier, and a first electromagnetic driving mechanism that drives the first carrier and a second electromagnetic driving mechanism that drives the second carrier, the first carrier and the second carrier being provided in the frame and configured to mount at least two optical elements,

the first carrier is provided with a first optical element mounting part and a carrier mounting part along the axial direction, the second carrier is movably mounted in the carrier mounting part, the first electromagnetic driving mechanism is arranged in front of the first carrier and the frame to drive the first carrier to move relative to the frame, and the second electromagnetic driving mechanism is arranged between the first carrier and the second carrier to drive the second carrier to move relative to the first carrier.

2. The optical element driving device according to claim 1, wherein the first electromagnetic driving mechanism includes a first magnet and a first coil provided on the frame and the first carrier, respectively, and the second electromagnetic driving mechanism includes a second magnet and a second coil provided on the first carrier and the second carrier, respectively.

3. The optical element driving device according to claim 2, further comprising a magnet mounting plate, wherein a magnet mounting groove extending in the axial direction is provided in an outer side wall of the first carrier, the first magnet is mounted to the magnet mounting plate, and the magnet mounting plate is mounted in the magnet mounting groove.

4. The optical element driving device according to claim 3, wherein the magnet mounting groove extends from an outer side wall of the optical element mounting portion to an outer side wall of the carrier mounting portion, and a side wall of the frame is provided with the first coil that engages with the first magnet.

5. An optical element driving device according to claim 4, wherein said first magnet and said second magnet are a same group of magnets provided on said first carrier, and a side wall of said second carrier is provided with said second coil cooperating with said first magnet.

6. An optical element driving device as claimed in claim 1, further comprising a first guide group and a second guide group, the first guide group being fixedly mounted within the frame and movably mounting the first carrier and the second carrier within the frame, the second guide group movably mounting the second carrier within the carrier mounting portion of the first carrier.

7. The optical element driving apparatus as claimed in claim 6, wherein said first guide group includes two first guide rods, said first carrier is provided at both sides of said first optical element mounting portion with first guide holes to be engaged with said first guide rods, and said second carrier is provided with a second optical element mounting portion to which optical elements are mounted and is provided at both sides of said second optical element mounting portion with second guide holes, said two first guide rods are fixedly provided in said frame and sequentially pass through said first guide holes and said second guide holes to movably mount said first carrier and said second carrier in said frame; preferably, the first guide group extends from one end of the frame to the other end of the frame.

8. An optical element driving apparatus as claimed in claim 7, wherein the second guide group comprises two second guide rods fixedly mounted on both sides of the first optical element mounting portion of the first carrier, and third guide holes engaged with the second guide rods are formed on both sides of the second optical element mounting portion of the second carrier, so that the second carrier is movably mounted in the carrier mounting portion of the first carrier.

9. The optical element driving device according to claim 1, further comprising a stopper group provided in the first carrier and protruding from end surfaces of the first carrier at both ends, respectively.

10. The optical element driving device as claimed in claim 9, wherein the limiting group comprises two limiting rods, and two ends of the two limiting rods are provided with buffering members, preferably the buffering members are sliding sleeves.

11. The optical element driving device according to claim 2, further comprising a circuit board including a first portion fixedly mounted on the frame and a second portion fixedly mounted on the carrier mounting portion of the first carrier, the first portion being provided with the first coil, the second portion being provided with the second coil.

12. An optical element driving apparatus according to claim 11, wherein the first portion is mounted to one side wall of the frame, and the second portion includes two opposite side portions which are respectively mounted to two side walls of the carrier mounting portion of the first carrier and connected by a third portion.

13. The optical element driving apparatus as claimed in claim 12, wherein the third portion is connected to the first portion by a plurality of bent first elastic bending portions, and the third portion is connected to the second portion by a plurality of bent second elastic bending portions.

14. An optical element driving device according to claim 11, wherein the bottom of the first carrier is further provided with a grating ruler, and the frame is provided with a grating sensor engaged with the grating ruler.

Technical Field

The invention relates to the field of optics, in particular to an optical element driving device.

Background

The motor of the geared optical element drive is typically mounted within the handset camera module and is typically driven by an electromagnetic combination of magnets and coils that produce a magnetic field that interferes with other electronic components such as the interior of the handset. In addition, the suspension wires, the reeds and the like are usually adopted for assistance, and the irreversible deformation problems such as metal fatigue and metal deformation can be caused after the metal fatigue is suffered from impact.

In addition, how to achieve a zoom range with a larger multiple and a better imaging effect without additionally increasing the space occupied by the driving device is a problem to be solved in the field.

Disclosure of Invention

It is an object of the present invention to provide an optical element driving device to solve the above-mentioned problems of the prior art.

In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided an optical element driving device, the optical element driving device includes a frame, a first carrier, a second carrier, and a first electromagnetic driving mechanism that drives the first carrier and a second electromagnetic driving mechanism that drives the second carrier, the first and second carriers are disposed within the frame and are for mounting at least two optical elements, the first carrier is provided with a first optical element mounting part and a carrier mounting part along the axial direction, the second carrier is movably mounted in the carrier mounting part, the first electromagnetic driving mechanism is arranged in front of the first carrier and the frame to drive the first carrier to move relative to the frame, the second electromagnetic driving mechanism is arranged between the first carrier and the second carrier to drive the second carrier to move relative to the first carrier.

In one embodiment, the first electromagnetic drive mechanism includes a first magnet and a first coil disposed on the frame and the first carrier, respectively, and the second electromagnetic drive mechanism includes a second magnet and a second coil disposed on the first carrier and the second carrier, respectively.

In one embodiment, the optical element driving device further includes a magnet mounting plate, an outer side wall of the first carrier is provided with a magnet mounting groove extending in an axial direction, the first magnet is mounted to the magnet mounting plate, and the magnet mounting plate is mounted in the magnet mounting groove.

In one embodiment, the magnet mounting groove extends from an outer side wall of the optical element mounting portion to an outer side wall of the carrier mounting portion, and the side wall of the frame is provided with the first coil that is fitted with the first magnet.

In one embodiment, the first and second magnets are a same set of magnets disposed on the first carrier, and the second carrier has a sidewall provided with the second coil cooperating with the first magnet.

In one embodiment, the optical element driving apparatus further includes a first guide group fixedly installed in the frame and movably installing the first carrier and the second carrier in the frame, and a second guide group movably installing the second carrier in the carrier installation portion of the first carrier.

In one embodiment, the first guide group comprises two first guide rods, two sides of the first optical element mounting part of the first carrier are provided with first guide holes matched with the first guide rods, the second carrier is provided with a second optical element mounting part for mounting optical elements, two sides of the second optical element mounting part are provided with second guide holes, and the two first guide rods are fixedly arranged in the frame and sequentially penetrate through the first guide holes and the second guide holes so as to movably mount the first carrier and the second carrier in the frame; preferably, the first guide group extends from one end of the frame to the other end of the frame.

In one embodiment, the second guiding set includes two second guiding rods, the two second guiding rods are fixedly mounted on two sides of the first optical element mounting portion of the first carrier, and third guiding holes matched with the second guiding rods are formed in two sides of the second optical element mounting portion of the second carrier, so that the second carrier can be movably mounted in the carrier mounting portion of the first carrier.

In one embodiment, the optical element driving apparatus further includes a limiting group disposed in the first carrier and protruding from end surfaces of the first carrier at two ends thereof, respectively.

In one embodiment, the limiting set comprises two limiting rods, wherein two ends of the two limiting rods are provided with buffering parts, and preferably, the buffering parts are sliding sleeves.

In one embodiment, the optical element driving device further includes a circuit board including a first portion fixedly mounted on the frame and a second portion fixedly mounted on the carrier mounting portion of the first carrier, the first portion being provided with the first coil, the second portion being provided with the second coil.

In one embodiment, the first portion is mounted to one side wall of the frame, and the second portion includes two opposite side portions mounted to two side walls of the carrier mounting portion of the first carrier, respectively, and connected by a third portion.

In one embodiment, the third portion is connected to the first portion by a plurality of bent first elastic bending portions, and the third portion is connected to the second portion by a plurality of bent second elastic bending portions.

In one embodiment, the bottom of the first carrier is further provided with a grating ruler, and the frame is provided with a grating sensor matched with the grating ruler.

In one embodiment, the optical element driving apparatus further comprises a holder that fixes the optical element.

In one embodiment, the optical element driving apparatus further comprises a base.

According to the invention, the first driving shaft and the second driving shaft are arranged on the same vertical plane in a staggered manner in the height direction of the frame, so that the space required by the first electromagnetic driving mechanism and the second electromagnetic driving mechanism is greatly reduced, and the volume of the electromagnetic driving mechanism of the optical element is integrally reduced, which is particularly important for the market demand that the miniaturization and light-weight requirements of the current intelligent equipment such as a mobile phone are higher and higher.

Drawings

Fig. 1 is an exploded perspective view of an electromagnetic drive mechanism for an optical element according to an embodiment of the present invention.

Fig. 2 is a plan view of an optical element driving apparatus according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view taken along line a-a in fig. 2.

Fig. 4 is a cross-sectional view taken along line C-C in fig. 2.

FIG. 5 is an exploded perspective view of the second carrier with the first magnet mounted thereon.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

The optical element driving device of the present invention is used as an auto-focusing type small camera which is applied to electronic devices such as mobile phones and smart phones.

Fig. 1 illustrates an exploded perspective view of an optical element driving apparatus 100 according to an embodiment of the present invention, and referring to fig. 1, the optical element driving apparatus 100 includes a frame 10, a first carrier 20, a second carrier 30, and a first electromagnetic driving mechanism that drives the first carrier 20 and a second electromagnetic driving mechanism that drives the second carrier 30, the first carrier 20 and the second carrier 30 being disposed in the frame 10 and used for mounting at least two optical elements, such as an optical element a and an optical element B. The first carrier 20 is provided with an optical element mounting portion 21 and a carrier mounting portion 22 along an axial direction, the second carrier 30 is movably mounted in the carrier mounting portion 22, the first electromagnetic driving mechanism is arranged in front of the first carrier 20 and the frame 10 to drive the first carrier 20 to move relative to the frame 10, and the second electromagnetic driving mechanism is arranged between the first carrier 20 and the second carrier 30 to drive the second carrier 30 to move relative to the first carrier 20. The second carrier 30 is arranged in the first carrier 20, so that the overall structure is more compact, and a better zooming effect is realized.

In one embodiment, the first electromagnetic driving mechanism includes a first magnet and a first coil respectively disposed on the frame 10 and the first carrier 20, that is, the first magnet may be disposed on the frame 10, the first coil may be disposed on the first carrier 20, or the first coil may be disposed on the frame 10, and the first magnet may be disposed on the first carrier 30. The second electromagnetic driving mechanism includes a second coil and a second magnet respectively disposed on the first carrier 20 and the second carrier 30, that is, the second magnet may be disposed on the first carrier 20, the second coil may be disposed on the second carrier 30, or the second magnet may be disposed on the second carrier 30, and the second coil may be disposed on the first carrier 20.

Specifically, in this embodiment, referring to fig. 2 to 5, there are shown a first electromagnetic drive mechanism and a second electromagnetic drive mechanism of an embodiment of the present invention, in which fig. 2 is a plan view of an optical element drive device 100 of an embodiment of the present invention, fig. 3 is a sectional view taken along line a-a in fig. 2, fig. 4 is a sectional view taken along line C-C in fig. 2, and fig. 5 is an exploded perspective view of a second carrier on which a first magnet is mounted. As shown in fig. 2 to 5, the outer side wall of the first carrier 20 is provided with a first magnet mounting groove 23 extending along the axial direction, the first magnet mounting groove 23 extends from the outer side wall of the first optical element mounting portion 21 of the first carrier 20 to the outer side wall of the carrier mounting portion 22, a first magnet 24 is mounted in the first magnet mounting groove 23, correspondingly, the side wall of the frame 10 is provided with a first coil 12 cooperating with the first magnet 24, and when the first coil 12 is energized, the first magnet 24 generates electromagnetic induction to drive the first carrier 20 to move, which will be further described in detail below.

In the embodiment shown in fig. 2 to 5, the optical element driving device 100 further includes a magnet mounting plate 25, and the first magnet 24 is first mounted in the magnet mounting plate 25, and then the magnet mounting plate 25 is mounted in the first magnet mounting groove 23 of the first carrier 20. However, those skilled in the art will appreciate that in other embodiments, the first magnet 24 may be directly mounted in the first magnet mounting groove 23 without using a magnet mounting plate. Further, as can also be seen from fig. 5, the length of the first magnet mounting groove 23 is substantially equal to the length of the first carrier 20, so that the side portions of the first carrier 20, including the carrier mounting portion and the magnet mounting portion, are provided with the first magnets 24.

With continued reference to fig. 2, the portion of the first magnet mounting groove 23 on the side wall of the carrier mounting portion 22 is an open structure, that is, the first magnet mounting groove 23 forms a magnet mounting hole on the carrier mounting portion 22 of the first carrier 20, so that the first magnet 24 mounted on the portion directly opposes the second coil 34 on the second carrier 30 to drive the second carrier 30 to move.

Referring to fig. 1 to 5, the optical element driving apparatus 100 further includes a first guide group 40, the first guide group 40 being fixedly installed in the frame 10 and movably installing the first and second carriers 20 and 30 in the frame 10. When the first electromagnetic driving mechanism, such as the first coil, is energized, it cooperates with the first magnet to drive the first carrier 20 along the first guide 40, thereby implementing the optical zoom function. Alternatively, the first guide 40 includes two first guide rods 41, and both sides of the first optical element mounting portion 21 of the first carrier 20 are provided with first guide holes 25 to be fitted with the first guide rods 41. Similarly, the second carrier 30 is provided with a second optical element mounting portion 31 to mount the optical element B and second guide holes 32 at both sides of the second optical element mounting portion 31, and two first guide rods 41 are fixedly provided in the frame 10 and pass through the first guide holes 31 and the second guide holes 32 in turn to movably mount the first carrier 20 and the second carrier 30 in the frame 10. Alternatively, the two first guide bars 41 of the first guide group extend from one end of the frame 10 to the other end of the frame 10 and are fixed to the frame 10.

With continued reference to fig. 1-5, the optical element driving device 100 further includes a second guide set 50, the second guide set 50 suspending the second carrier 30 within the first carrier 20. Alternatively, the second guiding set 50 includes two second guiding rods 51, and the two second guiding rods 51 are fixedly mounted on two sides of the optical component mounting portion 21 and the carrier mounting portion 22 of the first carrier 20, for example, the first carrier 20 is provided with a fixing hole 26 matched with the second guiding rod 51, two sides of the second optical component mounting portion 31 of the second carrier 30 are provided with a third guiding hole 33 matched with the second guiding rod 51, the second carrier 30 is movably mounted in the carrier mounting portion of the first carrier 20 by passing the second guiding rod 51 through the third guiding hole 33 on the second carrier 30 and fixing in the fixing hole 26 on the first carrier 20, and when the second coil is energized, the second coil is matched with the second magnet to drive the second carrier 30 to move along the second guiding rod 51 in the carrier mounting portion 22 of the first carrier 20.

In one embodiment, the optical element driving apparatus 100 further includes a limiting group 60, and the limiting group 60 is disposed in the first carrier 20 and protrudes from the end surface of the first carrier 20 at both ends to prevent the first carrier 20 from hitting the frame 10 and the second carrier 30 during the movement. Optionally, the limiting set 60 includes two limiting rods 61, the first carrier 20 is provided with a limiting hole 27, the limiting hole 27 penetrates through the whole optical element mounting portion 21 of the first carrier 20 and forms an opening at both ends, the limiting rod 61 is mounted in the limiting hole 27 and is provided with a buffer 62 at both ends, preferably, the buffer 62 is a sliding sleeve and is mounted in the opening of the limiting hole 27 on the end surface of the first carrier 20, and a part of the buffer 62 protrudes from both end surfaces of the optical element mounting portion 21 of the first carrier 20, so that when the first carrier 21 reciprocates in the frame 10, the end portion thereof does not directly collide with the frame 10 but contacts with the frame 10 through the buffer 61, and the second carrier 30 does not directly collide with the first carrier 20 but contacts with the buffer 62 during the movement. Therefore, the abrasion of the optical element driving device in the using process is effectively avoided, and the service life of the whole optical element driving device is prolonged.

Referring back to fig. 1, the optical element driving apparatus 100 further includes a circuit board 70, the circuit board 70 including: a first portion 71 fixedly mounted on the frame 10 and a second portion 72 fixedly mounted on the second carrier mounting portion 22 of the first carrier 20, wherein a surface of the first portion 71 facing the first carrier 20 is provided with a first coil (not shown), and a surface of the second portion 72 facing the second carrier 30 is provided with a second coil (not shown). Alternatively, the first portion 71 is mounted to only one side wall of the frame 10, the second portion 20 includes two opposite sides and is mounted to two opposite side walls of the carrier mounting portion 22 of the first carrier 20, respectively, and the opposite sides of the second portion 20 are connected by the third portion 73. That is, the driving of the first carrier 20 is implemented by one first coil and the first magnet being engaged, and the driving of the second carrier 30 is implemented by two second coils and the first magnet being engaged.

It should be noted that in other embodiments, the first portion 71 may also include two opposite side portions and be mounted on two opposite side walls of the frame 10, and one first coil is disposed on each side portion, so that the two first coils cooperate with the first magnets to drive the first carrier to move.

Similarly, the second portion 72 may include only one side portion and be disposed on only one of the side walls of the carrier mounting portion 22 of the first carrier 20, that is, the second carrier 30 may be driven by only one second coil in cooperation with the first magnet.

Alternatively, the third portion 73 of the circuit board 70 is connected to the first portion 71 by a plurality of bent first elastic bending portions 74, such that the third portion 73 can move relative to the first portion 71, and the third portion 73 is connected to the second portion 72 by a plurality of bent second elastic bending portions 75, such that the third portion 73 can move relative to the second portion 72. Since the first portion 71 is fixedly mounted to the frame 10, the second portion 72 is fixedly mounted to the second carrier 30, when the second electromagnetic driving mechanism drives the second carrier 30 to move away from the first carrier 20, the second portion 72 fixed on the second carrier 30 moves together with the second carrier 30, the first portion 71 fixed on the first carrier 20 remains stationary, the first elastic bending portion 24 and the second elastic bending portion 25 elastically stretch, when the second electromagnetic driving mechanism drives the second carrier 30 to move close to the first carrier 20, the second portion 72 fixed on the second carrier 30 moves together with the second carrier 30, the first portion 71 fixed on the first carrier 20 remains stationary, the first elastic bending portion 24 and the second elastic bending portion 25 elastically contract, therefore, reset and buffering are realized through the special structural design of the circuit board 70, and the circuit board has excellent technical effects.

Referring back to fig. 1, the optical element driving apparatus 100 may further include a bracket 80, and the bracket 80 cooperates with the optical element a and/or the optical element B to support and protect the optical element.

Optionally, the optical element driving apparatus 100 further includes a base 90, and both sides of the base 90 are provided with frame fitting portions 91, and the frame fitting portions 91 are fitted with side portions of the frame 10 to fixedly mount the first coil 12 of the first portion 71 of the circuit board 70.

Referring to fig. 3, optionally, a grating scale 14 is further fixedly mounted at the bottom of the first carrier 20, the frame 10 is mounted with a grating sensor 13 which is matched with the grating scale 14, the grating scale 14 is arranged on the bottom surface of the first carrier 20 along the length direction of the first carrier 20, and when the first carrier 20 moves, the grating sensor 13 detects the displacement of the grating scale 14 to determine the displacement of the first carrier 20. Alternatively, referring to fig. 4, the second carrier 30 is provided with a sensor 36, similar to the first sensor 20, and the displacement of the second carrier 30 is detected by the sensor 36 cooperating with a magnet.

Referring back to fig. 1, optionally, a third optical element C is further included in this example, the third optical element C is fixedly mounted on the front portion of the frame 10, specifically, the front portion of the frame 10 is provided with a third optical element mounting portion 15, and the optical element C is mounted in the third optical element mounting portion 15 and is coaxially disposed with the optical element a and the optical element B.

It should be noted that, due to the limitation of the size and the like of the apparatus in which the present optical element driving device is mounted, if only one optical element is used, it is impossible to have a higher-power optical zoom function while maintaining a high-quality imaging effect, and by the superposition of the first optical element and the second optical element, it is possible to achieve a higher-power optical zoom while maintaining a high-quality imaging effect. In addition, through the ingenious structural design of the first carrier and the second carrier, the whole optical element driving device does not occupy more space additionally, and the optical element driving device has the beneficial technical effects of miniaturization and high-precision imaging at the same time.

In addition, it should be noted that the optical element driving device of the present invention has a wide commercial application range, and can be widely applied to various electronic devices such as mobile phones and smart phones.

While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.