Optical Element Driving Device

Abstract

The present invention discloses an optical element driving device, which includes a frame, a first carrier, a second carrier, a first piezoelectric driving mechanism for driving the first carrier, and a second piezoelectric driving mechanism for driving the second carrier. The first carrier and the second carrier are arranged within the frame and are used for mounting 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 within the carrier mounting portion. The first piezoelectric driving mechanism is arranged between the first carrier and the frame to drive the first carrier to move relative to the frame. The second piezoelectric driving mechanism is arranged between the first carrier and the second carrier to drive the second carrier to move relative to the first carrier. By arranging the second carrier within the first carrier, the present invention makes the overall structure more compact, reduces the volume of the optical element driving mechanism as a whole, and simultaneously achieves a better zoom effect.

Description

Technical Field

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

[0002] The motor of a traditional optical element driving device is usually installed in a mobile phone camera module and is usually driven by an electromagnetic combination of a magnet and a coil, generating magnetic field interference to other electronic components inside the mobile phone. In addition, auxiliaries such as suspension wires and reeds are usually adopted, which have metal fatigue themselves and will have irreversible deformation problems such as metal deformation after being impacted.

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

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

[0005] To solve the above problems, according to one aspect of the present invention, an optical element driving device is provided. The optical element driving device includes a frame, a first carrier, a second carrier, a first piezoelectric driving mechanism for driving the first carrier, and a second piezoelectric driving mechanism 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 provided with a first optical element mounting portion and a carrier mounting portion along the axial direction. The second carrier is movably installed in the carrier mounting portion. The first piezoelectric driving mechanism is arranged between the first carrier and the frame to drive the first carrier to move relative to the frame. The second piezoelectric 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 piezoelectric driving mechanism includes a first piezoelectric driver and a first driving shaft. A first driving portion is provided on the side of the first carrier. The first driving shaft extends along the length direction of the frame and cooperates with the first driving portion. The first piezoelectric driver is arranged behind the first driving shaft to drive the first driving shaft to move axially, and

[0007] the second piezoelectric driving mechanism includes a second piezoelectric driver and a second driving shaft. A second driving portion is provided on the side of the second carrier. The second driving shaft extends along the length direction of the first carrier and cooperates with the second driving portion. The second piezoelectric driver is arranged behind the second driving shaft to drive the second driving shaft to move axially.

[0008] In one embodiment, the optical element driving device further includes a first guiding group and a second guiding group.

[0009] The first guiding group is fixedly installed in the frame and cooperates with the first carrier. The first carrier moves in the frame along the first guiding member under the drive of the first piezoelectric driving mechanism.

[0010] The second guiding group is fixedly installed in the first carrier and cooperates with the second carrier. The second carrier moves in the frame along the second guiding group under the drive of the second piezoelectric driving mechanism.

[0011] In one embodiment, the first guiding group includes two first guiding rods. On each side of the optical element mounting portion of the first carrier, there is respectively provided a first guiding hole. The two first guiding rods respectively extend into the first guiding holes to movably mount the first carrier in the frame.

[0012] In one embodiment, the second guiding group includes two second guiding rods. The second carrier is provided with a second optical element mounting portion and on each side of the second optical element mounting portion, there is respectively provided a second guiding hole. The two second guiding rods respectively extend into the second guiding holes to movably mount the second carrier in the carrier mounting portion of the first carrier.

[0013] In one embodiment, the frame extends along the optical axis direction and has a front end and a rear end. The front end is provided with a fixed optical element mounting hole for mounting a fixed optical element, and on one side of the fixed optical element mounting hole, there is provided a first piezoelectric mounting groove. The first piezoelectric driver is disposed in the first piezoelectric mounting groove.

[0014] In one embodiment, the first carrier is provided with a second piezoelectric mounting groove. The second piezoelectric driver is disposed in the second piezoelectric mounting groove. Among them, the first piezoelectric mounting groove and the second piezoelectric mounting groove are arranged on the same side of the frame.

[0015] In one embodiment, the two ends of the first guiding rod are respectively fixed to the front end and the rear end of the frame, and the second carrier is provided with a third guiding hole cooperating with the first guiding rod. The first guiding rod sequentially passes through the first guiding hole and the second guiding hole, so that the first carrier and the second carrier move relative to the first guiding rod and the second guiding rod in the frame.

[0016] In one embodiment, the first driving part is provided with a first friction plate, the first driving shaft is a first friction rod, and the first friction rod is in frictional engagement with the first friction plate to drive the first carrier to move. In addition, the second driving part is provided with a second friction plate, the second driving shaft is a second friction rod, and the second friction rod is in engagement with the second friction plate to drive the second carrier to move.

[0017] In one embodiment, the optical element driving device further includes an upper cover, which is disposed above the frame and cooperates with the frame to encapsulate the first carrier and the second carrier.

[0018] In one embodiment, the optical element driving device further includes a circuit board, which is disposed outside the frame and electrically connected to the first piezoelectric driver and the second piezoelectric driver.

[0019] In one embodiment, a first sensor is provided on the side of the first carrier where the first driving part is disposed, and a first magnet cooperating with the first sensor is provided on the frame. In addition, a second magnet is provided on the side of the second carrier where the second driving part is disposed, and a second sensor is provided on the side of the second optical element mounting part of the first carrier. Among them, the first sensor and the second sensor are respectively electrically connected to the circuit board, and current and signal transmission are performed through the circuit board.

[0020] By disposing the second carrier inside the first carrier, the present invention makes the overall structure more compact, reduces the volume of the optical element driving mechanism as a whole, and at the same time achieves a better zoom effect, which is particularly important for the current market demand for smaller and thinner smart devices such as mobile phones. Description of the Drawings

[0021] Figure 1 is an exploded perspective view of an optical element driving device according to an embodiment of the present invention.

[0022] Figure 2 is a perspective view of a first carrier according to an embodiment of the present invention.

[0023] Figure 3 is a perspective view of a second carrier according to an embodiment of the present invention.

[0024] Figure 4 is Figure 2 of the first carrier and Figure 3 of the second carrier assembled into a component perspective view. Detailed Description of the Embodiment

[0025] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only to illustrate the essential spirit of the technical solution of the present invention.

[0026] In the following description, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, one of ordinary skill in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0027] References to "one embodiment" or "an embodiment" in the course of the specification mean 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 the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0028] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, words such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be construed as limiting terms.

[0029] The present invention generally relates to the structure of a periscope optical element. The following is a simple description of the periscope optical element structure with reference to Figure 1 As shown in Figure 1 , the periscope optical element structure generally includes two parts, namely, a periscope part 100 and a prism part 200. The prism part 200 is disposed at the front end of the periscope part 100, and an imaging chip 300 is disposed at the rear end of the periscope part 100. Light is reflected by the prism part 200 and enters the periscope part 100. The periscope part 100 is responsible for performing the optical zoom function, and the prism part is responsible for the anti-shake function.

[0030] The following embodiments only describe the periscope part 100, and the periscope part 100 is also referred to as an optical element driving device in the present invention. Figure 1 is an exploded perspective view of the optical element driving device 100 according to an embodiment of the present invention, Figure 2 is a perspective view of the first carrier 20 according to an embodiment of the present invention, Figure 3 is a perspective view of the second carrier 30 according to an embodiment of the present invention, Figure 4 is Figure 2The first carrier and Figure 3 The perspective view of the component assembled by the second carrier. As Figures 1-4 shown, the optical element driving device 100 includes a frame 10, a first carrier 20, a second carrier 30, a first piezoelectric driving mechanism 40 for driving the first carrier 20, and a second piezoelectric driving mechanism 50 for driving the second carrier 30. The first carrier 20 and the second carrier 30 are disposed within the frame 10 and are used for mounting a first optical element A and a second optical element B. The first carrier 20 is axially provided with a first optical element mounting portion 21 and a carrier mounting portion 22. The second carrier 30 is movably mounted within the carrier mounting portion 22. The first piezoelectric driving mechanism 40 is disposed between the first carrier 20 and the frame 10 to drive the first carrier 20 to move relative to the frame 10. The second driving mechanism 50 is disposed between the first carrier 20 and the second carrier 30 to drive the second carrier 30 to move relative to the first carrier 20. By disposing the second carrier 30 within the first carrier 20, the overall structure is made more compact, and at the same time, a better zoom effect is achieved.

[0031] In one embodiment, the first piezoelectric driving mechanism 40 includes a first piezoelectric driver 41 and a first driving shaft 42. The first driving shaft 42 extends along the length direction of the frame 10 and cooperates with the side portion of the first carrier 20. The first piezoelectric driver 41 is disposed behind the first driving shaft 42 to drive the first driving shaft 42 to move axially. The second piezoelectric driving mechanism 50 includes a second piezoelectric driver 51 and a second driving shaft 52. The second driving shaft 52 extends along the length direction of the first carrier 20 and cooperates with the side portion of the second carrier 30. The second piezoelectric driver 52 is disposed behind the second driving shaft 51 to drive the second driving shaft 52 to move axially. The first piezoelectric driver 41 and the second piezoelectric driver 51 may be, for example, piezoelectric ceramic stacks. By applying a voltage, the piezoelectric ceramic stacks generate displacements. The first driving shaft 42 and the second driving shaft 52 may be, for example, friction rods. After the piezoelectric drivers apply a voltage, they vibrate at a high frequency, thereby driving the friction rods to move. The friction rods are in frictional cooperation with the first carrier and the second carrier, and further drive the first carrier 20 and the second carrier 30 to move.

[0032] Continuing to refer to Figures 1-3 , the optical element driving device 100 further includes a first guiding group 60 and a second guiding group 70. The first guiding group 60 is fixedly mounted within the frame 10 and cooperates with the first carrier 20 to guide the first carrier 20 so that it moves within the frame 10 along the first guiding group 60 under the drive of the first piezoelectric driving mechanism. The second guiding group 70 is fixedly mounted within the first carrier 20 and cooperates with the second carrier 30 to guide the second carrier 30 so that it moves within the frame 10 along the second guiding group 70 under the drive of the second piezoelectric driving mechanism 50.

[0033] In one embodiment, the first guiding group 60 includes two first guiding rods 61. On each side of the optical element mounting portion 21 of the first carrier 20, there is respectively provided a first guiding hole (not shown in the figure). The two first guiding rods 61 are respectively inserted into the first guiding holes, thereby movably mounting the first carrier 20 within the frame 10.

[0034] Similarly, in one embodiment, the second guiding group 70 includes two second guiding rods 71. The second carrier 30 is provided with a second optical element mounting portion 31 for mounting the optical element B. The second optical element mounting portion 31 is coaxially arranged with the first optical element mounting portion 21 of the first carrier 20. The second optical element mounting portion 31 forms a groove with an upward opening, and on each side of the groove, there is respectively provided a second guiding hole (not shown in the figure). The two second guiding rods 71 are movably mounted within the second guiding holes, so that the second carrier 30 moves along the two second guiding rods 71 within the carrier mounting portion 21 of the first carrier 20 under the drive of the second piezoelectric driving mechanism 50.

[0035] Continuing to refer to Figure 1 , the frame 10 extends along the optical axis direction and has a front end 11 and a rear end 12. The front end 11 is provided with a fixed optical element mounting portion 111 for mounting the fixed optical element C. On one side of the fixed optical element mounting portion 111, there is provided a first piezoelectric mounting groove 112. The first piezoelectric driver 41 is arranged within the first piezoelectric mounting groove 112. Behind the first piezoelectric driver 41, there is a first mass block 43. The first mass block 43 is arranged closely against the first piezoelectric driver 41. The first piezoelectric driver 41 is connected to a power source through a wire 411. In front of the first piezoelectric driver 41, it is connected to a first drive shaft 42 and drives the first drive shaft 42 to move, and cooperates with the first carrier 20 through the first drive shaft 42 to drive the first carrier 20 to move.

[0036] Similarly, referring to Figures 2-4 , the first carrier 20 is provided with a second piezoelectric mounting groove 23. The second piezoelectric driver 51 is arranged within the second piezoelectric mounting groove 23. The second piezoelectric driving mechanism further includes a second mass block 53. The second mass block 53 is also arranged within the second piezoelectric mounting groove 23 and is arranged closely against the second piezoelectric driver 51 behind the second piezoelectric driver 51. Optionally, a baffle 54 is further provided behind the second mass block 53 to limit the second mass block 53. Preferably, the first piezoelectric mounting groove 112 and the second piezoelectric mounting groove 23 are arranged on the same side of the frame 10.

[0037] Optionally, as Figures 1-4 shown, both ends of the two first guiding rods 61 of the first guiding group 60 are respectively fixed to the front end 11 and the rear end 12 of the frame 10. That is to say, the lengths of the two first guiding rods 61 are approximately equal to the length of the frame 10.

[0038] Optionally, the second carrier 30 is provided with a third guiding hole that cooperates with the first guiding rod 61. The first guiding rod 61 is slidably inserted into the third guiding hole of the second carrier 20 so that the second carrier 30 can also move relative to the first guiding rod 61. That is to say, the first guiding rod 61 sequentially passes through the first guiding hole of the first carrier 20 and the third guiding hole of the second carrier 30, and enables the first carrier 20 and the second carrier 30 to move relative to the first guiding rod 61.

[0039] In one embodiment, referring to Figures 1-4 , the first driving part 24 of the first carrier 20 is in frictional cooperation with the first driving shaft 42. For example, a first friction plate 44 can be fixedly arranged on the first driving part 24, and the first driving shaft 42 is a first friction rod. The first carrier 20 is driven to move relative to the frame 10 through the frictional cooperation between the first friction plate and the first friction rod. Similarly, the second driving part 32 of the second carrier 30 is in frictional cooperation with the second driving shaft 52. For example, a second friction plate (not shown in the figure) is fixedly arranged on the second driving part 32, and the second driving shaft 52 is a second friction rod. The second carrier 30 is driven to move relative to the first carrier 20 through the frictional cooperation between the second friction plate and the second friction rod.

[0040] Optionally, referring to Figure 1 , the optical element driving device 100 further includes an upper cover 90. The upper cover 90 cooperates with the frame 10 and encapsulates the first carrier 20, the second carrier 30, the first optical element A, the second optical element B, and the third optical element C.

[0041] Referring to Figure 1 and Figure 4 , the optical element driving device further includes a circuit board 80. The circuit board 80 is arranged outside the frame 10 and is electrically connected to the first piezoelectric driver 41 and the second piezoelectric driver 51. Optionally, a first sensor 25 is provided on the side of the first carrier 20 where the first driving part 24 is arranged. Correspondingly, a first magnet 13 is provided on the frame 10 that cooperates with the first sensor. The first sensor 25 is electrically connected to the circuit board 80, and current and signal transmission are carried out through the circuit board 80. Similarly, a second magnet 33 is provided on the side of the second carrier 30 close to the circuit board 80, and a second sensor 34 is provided on the side of the second optical element mounting part 22 of the first carrier 20. The second sensor 34 is electrically connected to the circuit board 80, and current and signal transmission are carried out through the circuit board 80. The displacements of the first carrier 20 and the second carrier 30 are detected through the cooperation between the first sensor 25 and the first magnet 13 and the cooperation between the second sensor 34 and the second magnet 35.

[0042] It should be noted that due to the limitations of the size of the device on which this optical element driving device is installed, etc., if only one optical element is used, it is impossible to have a higher magnification optical zoom function while maintaining a high-quality imaging effect. However, by superimposing the first optical element and the second optical element, a higher magnification optical zoom can be achieved while maintaining a high-quality imaging effect. Through the ingenious structural design of the first carrier and the second carrier in the present invention, the entire optical element driving device does not occupy extra space, enabling the optical element driving device to have the beneficial technical effects of miniaturization and high-precision imaging at the same time.

[0043] In addition, it should also be noted that the optical element driving device of the present invention also has a wide range of commercial usage scenarios and can be widely applied to various electronic devices such as mobile phones and smart phones.

[0044] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can 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 includes a frame, a first carrier, a second carrier, a first piezoelectric driving mechanism for driving the first carrier, and a second piezoelectric driving mechanism for driving the second carrier. The first carrier and the second carrier are disposed within the frame and are used for mounting 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 within the carrier mounting portion. The first piezoelectric driving mechanism is disposed between the first carrier and the frame to drive the first carrier to move relative to the frame. The second piezoelectric driving mechanism is disposed between the first carrier and the second carrier to drive the second carrier to move relative to the first carrier. The first piezoelectric driving mechanism includes a first piezoelectric driver and a first driving shaft. A first driving portion is provided on the side of the first carrier. The first driving shaft extends along the length direction of the frame and cooperates with the first driving portion. The first piezoelectric driver is disposed behind the first driving shaft to drive the first driving shaft to move axially. And The second piezoelectric driving mechanism includes a second piezoelectric driver and a second driving shaft. A second driving portion is provided on the side of the second carrier. The second driving shaft extends along the length direction of the first carrier and cooperates with the second driving portion. The second piezoelectric driver is disposed behind the second driving shaft to drive the second driving shaft to move axially. The frame extends along the optical axis direction and has a front end and a rear end. The front end is provided with a fixed optical element mounting hole for mounting a fixed optical element, and a first piezoelectric mounting groove is provided on one side of the fixed optical element mounting hole. The first piezoelectric driver is disposed within the first piezoelectric mounting groove. The first carrier is provided with a second piezoelectric mounting groove. The second piezoelectric driver is disposed within the second piezoelectric mounting groove. Among them, the first piezoelectric mounting groove and the second piezoelectric mounting groove are arranged on the same side of the frame.

2. The optical element driving device according to claim 1, wherein The optical element driving device further includes a first guiding group and a second guiding group. The first guiding group is fixedly mounted within the frame and cooperates with the first carrier. The first carrier moves within the frame along the first guiding member under the drive of the first piezoelectric driving mechanism. The second guiding group is fixedly mounted within the first carrier and cooperates with the second carrier. The second carrier moves within the frame along the second guiding group under the drive of the second piezoelectric driving mechanism.

3. The optical element driving device according to claim 2, wherein, The first guiding group includes two first guiding rods. One first guiding hole is respectively provided on both sides of the optical element mounting portion of the first carrier. The two first guiding rods respectively extend into the first guiding holes to movably mount the first carrier within the frame.

4. The optical element driving device according to claim 2, wherein The second guiding group includes two second guiding rods. The second carrier is provided with a second optical element mounting portion and two second guiding holes are respectively provided on both sides of the second optical element mounting portion. The two second guiding rods respectively extend into the second guiding holes to movably mount the second carrier within the carrier mounting portion of the first carrier.

5. The optical element driving device according to claim 3, characterized in that, Both ends of the first guide rod are respectively fixed to the front end and the rear end of the frame, and the second carrier is provided with a third guide hole that cooperates with the first guide rod. The first guide rod sequentially passes through the first guide hole and the second guide hole, so that the first carrier and the second carrier move relative to the first guide rod and the second guide rod within the frame.

6. The optical element driving device according to claim 1, wherein The first driving portion is provided with a first friction plate, the first driving shaft is a first friction rod, and the first friction rod is in frictional cooperation with the first friction plate to drive the first carrier to move. The second driving portion is provided with a second friction plate, the second driving shaft is a second friction rod, and the second friction rod is in cooperation with the second friction plate to drive the second carrier to move.

7. The optical element driving device according to claim 1, characterized in that, The optical element driving device further includes an upper cover, and the upper cover is disposed above the frame and cooperates with the frame to encapsulate the first carrier and the second carrier.

8. The optical element driving device according to claim 1, wherein The optical element driving device further includes a circuit board, and the circuit board is disposed outside the frame and electrically connected to the first piezoelectric driver and the second piezoelectric driver.

9. The optical element driving device according to claim 8, wherein A first sensor is provided on a side portion of the first carrier where the first driving portion is provided, and a first magnet that cooperates with the first sensor is provided on the frame. A second magnet is provided on a side portion of the second carrier where the second driving portion is provided, and a second sensor is provided on a side portion of the second optical element mounting portion of the first carrier. Among them, the first sensor and the second sensor are respectively electrically connected to the circuit board, and current and signal transmission are performed through the circuit board.

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