Optical element drive device

Abstract

The present invention discloses an optical element driving device, comprising a frame, a first carrier, a second carrier, and a first electromagnetic driving mechanism for driving the first carrier and a second electromagnetic driving mechanism for driving the second carrier, wherein the first carrier and the second carrier are arranged in the frame and used to install at least two optical elements, the first carrier is provided with a first optical element mounting portion and a carrier mounting portion along the axial direction, the second carrier is movably mounted in the carrier mounting portion, the first electromagnetic driving mechanism is arranged between 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. The optical element driving device of the present invention can reduce the volume of the optical element electromagnetic driving mechanism as a whole while achieving a larger zoom range.

Description

Technical Field

[0001] The present invention relates to the field of optics, and in particular to an optical element driving device. Background Art

[0002] The motor of the optical element driving device is usually installed in the mobile phone camera module and is usually driven by an electromagnetic combination of magnets and coils, generating a magnetic field that interferes with other electronic components inside the mobile phone. In addition, it is usually supplemented by suspension wires and reeds, which have metal fatigue and irreversible deformation problems such as metal deformation after impact.

[0003] In addition, how to achieve a larger zoom range and better imaging effect without increasing the space occupied by the driving device has always been a problem to be solved in the field. Summary of the invention

[0004] The purpose of the present invention is to provide an optical element driving device to solve the above problems in the prior art.

[0005] In order to solve the above problems, according to one aspect of the present invention, an optical element driving device is provided, which includes a frame, a first carrier, a second carrier, and a first electromagnetic driving mechanism for driving the first carrier and a second electromagnetic driving mechanism for driving the second carrier, the first carrier and the second carrier are arranged in the frame and are used to install at least two optical elements, the first carrier is axially provided with a first optical element mounting portion and a carrier mounting portion, the second carrier is movably mounted in the carrier mounting portion, the first electromagnetic driving mechanism is arranged between 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.

[0006] In one embodiment, the first electromagnetic driving mechanism includes a first magnet and a first coil respectively disposed on the frame and the first carrier, and the second electromagnetic driving mechanism includes a second magnet and a second coil respectively disposed on the first carrier and the second carrier.

[0007] In one embodiment, the optical element driving device further includes a magnet mounting plate, the outer side wall of the first carrier is provided with a magnet mounting groove extending axially, the first magnet is mounted on the magnet mounting plate, and the magnet mounting plate is mounted in the magnet mounting groove.

[0008] In one embodiment, the magnet mounting groove extends from the outer side wall of the optical element mounting portion to the outer side wall of the carrier mounting portion, and the side wall of the frame is provided with the first coil matched with the first magnet.

[0009] In one embodiment, the first magnet and the second magnet are the same group of magnets disposed on the first carrier, and the side wall of the second carrier is provided with the second coil matched with the first magnet.

[0010] In one embodiment, the optical element driving device also includes a first guide group and a second guide group, the first guide group is fixedly installed in the frame and movably installs the first carrier and the second carrier in the frame, and the second guide group movably installs the second carrier in the carrier mounting part of the first carrier.

[0011] In one embodiment, the first guide group includes two first guide rods, first guide holes matching with the first guide rods are provided on both sides of the first optical element mounting portion of the first carrier, and the second carrier is provided with a second optical element mounting portion for mounting the optical element and second guide holes are provided on both sides of the second optical element mounting portion, the two first guide rods are fixedly arranged in the frame and pass through the first guide holes and the second guide holes in sequence 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.

[0012] In one embodiment, the second guide group includes two second guide rods, and the two second guide rods are fixedly mounted on both sides of the first optical element mounting portion of the first carrier, and third guide holes cooperating with the second guide rods are provided on both 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.

[0013] In one embodiment, the optical element driving device further comprises a limiter group, which is disposed in the first carrier and protrudes from end surfaces of the first carrier at two ends.

[0014] In one embodiment, the limiting group includes two limiting rods, and buffer components are provided at both ends of the two limiting rods. Preferably, the buffer components are sliding sleeves.

[0015] In one embodiment, the optical element driving device also includes a circuit board, which includes a first part fixedly mounted on the frame and a second part fixedly mounted on the carrier mounting portion of the first carrier, the first part is provided with the first coil, and the second part is provided with the second coil.

[0016] In one embodiment, the first part is mounted on a side wall of the frame, and the second part includes two opposite side portions, which are respectively mounted on two side walls of the carrier mounting portion of the first carrier and connected through a third part.

[0017] In one embodiment, the third part is connected to the first part via a plurality of bent first elastic bent portions, and the third part is connected to the second part via a plurality of bent second elastic bent portions.

[0018] In one embodiment, a grating ruler is further provided at the bottom of the first carrier, and a grating sensor cooperating with the grating ruler is provided at the frame.

[0019] In one embodiment, the optical element driving device further comprises a bracket for fixing the optical element.

[0020] In one embodiment, the optical element driving device further includes a base.

[0021] The present invention arranges the first drive shaft and the second drive shaft staggered in the height direction of the frame and on the same vertical plane, so that the space required by the first electromagnetic drive mechanism and the second electromagnetic drive mechanism is greatly reduced, thereby reducing the overall volume of the electromagnetic drive mechanism of the optical element. This is particularly important in view of the increasingly high market demand for miniaturization and lightweight of smart devices such as mobile phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional exploded view of the electromagnetic driving mechanism of an optical element according to an embodiment of the present invention.

[0023] Figure 2 FIG. 1 is a top view of an optical element driving device according to an embodiment of the present invention.

[0024] Figure 3 yes Figure 2 Sectional view along line AA.

[0025] Figure 4 yes Figure 2 Cross-sectional view taken along line CC.

[0026] Figure 5 It is a perspective exploded view of the second carrier on which the first magnet is mounted. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0028] In the following description, certain specific details are set forth for the purpose of illustrating the various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0029] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0030] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0031] The optical element driving device of the present invention is used as an auto-focusing small camera, and the auto-focusing small camera is applied to electronic devices such as mobile phones and smart phones.

[0032] Figure 1 FIG. 1 is a perspective exploded view of an optical element driving device 100 according to an embodiment of the present invention. Figure 1The optical element driving device 100 includes a frame 10, a first carrier 20, a second carrier 30, and a first electromagnetic driving mechanism driving the first carrier 20 and a second electromagnetic driving mechanism driving the second carrier 30. The first carrier 20 and the second carrier 30 are arranged in the frame 10 and are used to install 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 the axial direction, and the second carrier 30 can be movably mounted in the carrier mounting portion 22. The first electromagnetic driving mechanism is arranged between 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 present invention makes the overall structure more compact and achieves a better zoom effect by arranging the second carrier 30 in the first carrier 20.

[0033] In one embodiment, the first electromagnetic drive 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 and 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 drive 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 and 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.

[0034] Specifically, in this embodiment, refer to Figure 2-5 , which shows a first electromagnetic drive mechanism and a second electromagnetic drive mechanism according to an embodiment of the present invention, wherein Figure 2 is a top view of an optical element driving device 100 according to an embodiment of the present invention, Figure 3 yes Figure 2 The cross-sectional view taken along line AA in the figure is as follows: Figure 4 yes Figure 2 The cross-sectional view along line CC is shown in the figure. Figure 5 : is a three-dimensional exploded view of the second carrier with the first magnet installed. Figure 2-5 As shown, the outer wall of the first carrier 20 is provided with a first magnet mounting groove 23 extending along the axial direction, and the first magnet mounting groove 23 extends from the outer wall of the first optical element mounting part 21 of the first carrier 20 to the outer wall of the carrier mounting part 22, and the first magnet 24 is installed in the first magnet mounting groove 23. Correspondingly, the side wall of the frame 10 is provided with a first coil 12 that cooperates with the first magnet 24. When the first coil 12 is energized, electromagnetic induction occurs with the first magnet 24, thereby driving the first carrier 20 to move, which will be further described in detail below.

[0035] exist Figure 2-5 In the illustrated embodiment, the optical element driving device 100 further includes a magnet mounting plate 25, the first magnet 24 is firstly 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, it can be understood by those skilled in the art that in other embodiments, the magnet mounting plate may not be used, and the first magnet 24 may be directly mounted in the first magnet mounting groove 23. Figure 5 It can also be seen that the length of the first magnet mounting groove 23 is substantially equal to the length of the first carrier 20 , so that the side of the first carrier 20 , including the side of the carrier mounting portion and the magnet mounting portion, is provided with the first magnet 24 .

[0036] Continue to refer to Figure 2 The portion of the first magnet mounting groove 23 located 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 installed in this portion is directly opposite to the second coil 34 on the second carrier 30 to drive the second carrier 30 to move.

[0037] Reference Figure 1-5 , the optical element driving device 100 also includes a first guide group 40, which is fixedly installed in the frame 10 and movably installs the first carrier 20 and the second carrier 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 to move along the first guide member 40 to achieve the optical zoom function. Optionally, the first guide member 40 includes two first guide rods 41, and the first optical element mounting portion 21 of the first carrier 20 is provided with first guide holes 25 that cooperate with the first guide rods 41 on both sides. Similarly, the second carrier 30 is provided with a second optical element mounting portion 31 for mounting the optical element B and second guide holes 32 are provided on both sides of the second optical element mounting portion 31. The two first guide rods 41 are fixedly installed in the frame 10 and pass through the first guide hole 31 and the second guide hole 32 in sequence to movably install the first carrier 20 and the second carrier 30 in the frame 10. Optionally, the two first guide rods 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 on the frame 10 .

[0038] Continue to refer to Figure 1-5The optical element driving device 100 further includes a second guide group 50, and the second guide group 50 suspends the second carrier 30 in the first carrier 20. Optionally, the second guide group 50 includes two second guide rods 51, and the two second guide rods 51 are fixedly mounted on both sides of the optical element 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 guide rod 51, and both sides of the second optical element mounting portion 31 of the second carrier 30 are provided with a third guide hole 33 matched with the second guide rod 51. By passing the second guide rod 51 through the third guide hole 33 on the second carrier 30 and fixing it in the fixing hole 26 on the first carrier 20, the second carrier 30 is movably mounted in the carrier mounting portion of the first carrier 20. When the second coil is energized, the second coil cooperates with the second magnet to drive the second carrier 30 to move along the second guide rod 51 in the carrier mounting portion 22 of the first carrier 20.

[0039] In one embodiment, the optical element driving device 100 further includes a limiter set 60 , which 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 movement. Optionally, the limiting group 60 includes two limiting rods 61, the first carrier 20 is provided with a limiting hole 27, the limiting hole 27 penetrates the entire optical element mounting portion 21 of the first carrier 20 and forms openings at both ends, the limiting rod 61 is installed in the limiting hole 27 and is provided with buffers 62 at both ends, preferably, the buffer 62 is a sliding sleeve and is installed 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 the 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, its end does not directly collide with the frame 10, but contacts the frame 10 through the buffer 61, and the second carrier 30 does not directly collide with the first carrier 20 during the movement, but contacts the buffer 62. Thereby, the wear of the optical element driving device during use is effectively avoided, and the service life of the entire optical element driving device is extended.

[0040] Return to reference Figure 1The optical element driving device 100 further includes a circuit board 70, which includes: a first part 71 fixedly mounted on the frame 10 and a second part 72 fixedly mounted on the second carrier mounting portion 22 of the first carrier 20, wherein the first part 71 is provided with a first coil (not shown) on a surface facing the first carrier 20, and the second part 72 is provided with a second coil (not shown) on a surface facing the second carrier 30. Optionally, the first part 71 is only mounted on one side wall of the frame 10, the second part 20 includes two opposite side parts and is respectively mounted on two opposite side walls of the carrier mounting portion 22 of the first carrier 20, and the two opposite side parts of the second part 20 are connected by a third part 73. That is, the driving of the first carrier 20 is achieved by the cooperation of a first coil and a first magnet, and the driving of the second carrier 30 is achieved by the cooperation of two second coils and a first magnet.

[0041] It should be noted that, in other embodiments, the first part 71 may also include two opposite side portions and be installed on two opposite side walls of the frame 10, and a first coil is provided on each side portion, so that the first carrier is driven to move by the cooperation of the two first coils and the first magnet.

[0042] Similarly, the second portion 72 may also include only one side portion and be disposed on only one side wall of the carrier mounting portion 22 of the first carrier 20 , that is, the second carrier 30 may be driven only by the cooperation of one second coil and the first magnet.

[0043] Optionally, the third part 73 of the circuit board 70 is connected to the first part 71 by a plurality of first elastic bending portions 74, so that the third part 73 can move relative to the first part 71, and the third part 73 is connected to the second part 72 by a plurality of second elastic bending portions 75, so that the third part 73 can move relative to the second part 72. Since the first part 71 is fixedly mounted on the frame 10 and the second part 72 is fixedly mounted on 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 part 72 fixed on the second carrier 30 moves with the second carrier 30, and the first part 71 fixed on the first carrier 20 remains stationary, and the first elastic bending portion 24 and the second elastic bending portion 25 are elastically stretched; when the second electromagnetic driving mechanism drives the second carrier 30 to move close to the first carrier 20, the second part 72 fixed on the second carrier 30 moves with the second carrier 30, and the first part 71 fixed on the first carrier 20 remains stationary, and the first elastic bending portion 24 and the second elastic bending portion 25 are elastically contracted, thereby achieving resetting and buffering through the special structural design of the circuit board 70 itself, with excellent technical effects.

[0044] Return to reference Figure 1The optical element driving device 100 may further include a bracket 80, which cooperates with the optical element A and / or the optical element B to support and protect the optical element.

[0045] Optionally, the optical element driving device 100 further includes a base 90 , and frame matching parts 91 are provided on both sides of the base 90 , and the frame matching parts 91 match with the side of the frame 10 to fix the first coil 12 installed on the first part 71 of the circuit board 70 .

[0046] Reference Figure 3 Optionally, a grating ruler 14 is fixedly mounted on the bottom of the first carrier 20, and a grating sensor 13 cooperating with the grating ruler 14 is mounted on the frame 10. The grating ruler 14 is arranged on the bottom surface of the first carrier 20 along the length direction of the first carrier 20. When the first carrier 20 moves, the grating sensor 13 determines the displacement of the first carrier 20 by detecting the displacement of the grating ruler 14. Optionally, refer to Figure 4 Similar to the first sensor 20 , the second carrier 30 is provided with a sensor 36 , and the displacement of the second carrier 30 is detected by the cooperation between the sensor 36 and the magnet.

[0047] Return to reference Figure 1 Optionally, the present example also includes a third optical element C, which is fixedly mounted on the front of the frame 10. Specifically, a third optical element mounting portion 15 is provided on the front of the frame 10, and the optical element C is mounted in the third optical element mounting portion 15 and is coaxially arranged with the optical element A and the optical element B.

[0048] It should be noted that, due to the limitation of the size of the device on which the optical element driving device is installed, if only one optical element is used, it is impossible to have a higher optical zoom function while maintaining a high-quality imaging effect. However, by superimposing the first optical element and the second optical element, a higher optical zoom can be achieved while maintaining a high-quality imaging effect. In addition, through the ingenious structural design of the first carrier and the second carrier of the present invention, the entire optical element driving device does not occupy more space, so that the optical element driving device has the beneficial technical effects of miniaturization and high-precision imaging.

[0049] In addition, it should be noted that the optical element driving device of the present invention also has broad commercial application scenarios and can be widely used in various electronic devices such as mobile phones and smart phones.

[0050] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An optical element driving device, characterized in that: The optical element driving device comprises a frame, a first carrier, a second carrier, and a first electromagnetic driving mechanism driving the first carrier and a second electromagnetic driving mechanism driving the second carrier. The first carrier and the second carrier are arranged in the frame and used to mount at least two optical elements. The first carrier is provided with a first optical element mounting portion and a carrier mounting portion along the axial direction, the second carrier is movably mounted in the carrier mounting portion, the first electromagnetic driving mechanism is arranged between 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; The first electromagnetic driving mechanism comprises a first magnet and a first coil respectively arranged on the frame and the first carrier, and the second electromagnetic driving mechanism comprises a second magnet and a second coil respectively arranged on the first carrier and the second carrier; The first magnet and the second magnet are the same group of magnets arranged on the first carrier, and the side wall of the second carrier is provided with the second coil matched with the first magnet; The optical element driving device also includes a first guide group and a second guide group, the first guide group is fixedly installed in the frame and movably installs the first carrier and the second carrier in the frame, and the second guide group movably installs the second carrier in the carrier installation part of the first carrier.

2. The optical element driving device according to claim 1, characterized in that: The optical element driving device also includes a magnet mounting plate, the outer side wall of the first carrier is provided with a magnet mounting groove extending along the axial direction, the first magnet is mounted on the magnet mounting plate, and the magnet mounting plate is mounted in the magnet mounting groove.

3. The optical element driving device according to claim 2, characterized in that: The magnet mounting groove extends from the outer side wall of the optical element mounting portion to the outer side wall of the carrier mounting portion, and the side wall of the frame is provided with the first coil matched with the first magnet.

4. The optical element driving device according to claim 1, characterized in that: The first guide group includes two first guide rods, first guide holes matching with the first guide rods are provided on both sides of the first optical element mounting portion of the first carrier, and the second carrier is provided with a second optical element mounting portion for mounting the optical element and second guide holes are provided on both sides of the second optical element mounting portion, the two first guide rods are fixedly arranged in the frame and pass through the first guide holes and the second guide holes in sequence 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.

5. The optical element driving device according to claim 4, characterized in that: The second guide group includes two second guide rods, which are fixedly mounted on both sides of the first optical element mounting portion of the first carrier. Third guide holes cooperating with the second guide rods are provided on both 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.

6. The optical element driving device according to claim 1, characterized in that: The optical element driving device further comprises a limiter group, which is arranged in the first carrier and protrudes from the end surface of the first carrier at two ends.

7. The optical element driving device according to claim 6, characterized in that: The limiting group includes two limiting rods, and buffer components are provided at both ends of the two limiting rods. Preferably, the buffer components are sliding sleeves.

8. The optical element driving device according to claim 1, characterized in that: The optical element driving device also includes a circuit board, which includes a first part fixedly mounted on the frame and a second part fixedly mounted on the carrier mounting portion of the first carrier, the first part is provided with the first coil, and the second part is provided with the second coil.

9. The optical element driving device according to claim 8, characterized in that: The first part is mounted on a side wall of the frame, and the second part includes two opposite side parts, which are respectively mounted on two side walls of the carrier mounting portion of the first carrier and connected through a third part.

10. The optical element driving device according to claim 9, characterized in that: The third part is connected to the first part via a plurality of bent first elastic bent portions, and the third part is connected to the second part via a plurality of bent second elastic bent portions.

11. The optical element driving device according to claim 8, characterized in that: A grating ruler is also provided at the bottom of the first carrier, and a grating sensor matching with the grating ruler is provided at the frame.

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