Lens driving device and camera device

Abstract

The present disclosure provides a lens driving device, comprising: a lens support tube for holding at least one lens; a base having a side wall portion extending parallel to the optical axis direction of the lens; an actuator applying a driving force to the lens support tube so that the lens support tube moves along the optical axis direction; and a guide support ball member, comprising a first ball member and a second ball member, the first ball member and the second ball member contacting the outer side wall of the lens support tube and the inner side wall of the side wall portion of the base, and when the lens support tube moves relative to the side wall portion, the first ball member and the second ball member roll, wherein, when viewed from the top surface of the lens support tube, the actuator is located in one quadrant of a plane rectangular coordinate system, and the guide support ball member is located in another quadrant of the plane rectangular coordinate system, and the other quadrant is a quadrant at a diagonal position of one quadrant. The present disclosure also provides a camera device.

Description

Technical Field

[0001] The present disclosure relates to a lens driving device and a camera device. Background Art

[0002] Currently, electronic devices such as mobile phones or personal mobile terminals are equipped with camera functions. In order to enable the camera to achieve functions such as automatic zoom, optical zoom or optical image stabilization, it is necessary to use a lens driving device that can drive the lens.

[0003] The lens driving device uses the driving force generated by the actuator to drive the lens, thereby changing the distance of the lens to achieve functions such as zooming or focusing.

[0004] However, in the manufacturing process of the lens driving device, multiple components are required, the manufacturing cost is very high, and the manufacturing process is complicated, so the manufacturing is relatively difficult. Summary of the invention

[0005] In order to solve at least one of the above technical problems, the present disclosure provides a lens driving device and a camera device.

[0006] According to one aspect of the present disclosure, a lens driving device includes:

[0007] A lens support tube, wherein the lens support tube is used to hold at least one lens;

[0008] A base having a side wall portion extending parallel to the optical axis direction of the lens;

[0009] an actuator that applies a driving force to the lens support tube so that the lens support tube moves along the optical axis direction; and

[0010] The guide support ball component includes a first ball component and a second ball component, wherein the first ball component and the second ball component are in contact with the outer wall of the lens support tube and the inner wall of the side wall portion of the base, and when the lens support tube moves relative to the side wall portion, the first ball component and the second ball component roll.

[0011] Among them, observed from the top surface of the lens support tube, the actuator is located in one quadrant of the plane rectangular coordinate system, and the guide support ball component is located in another quadrant of the plane rectangular coordinate system, and the other quadrant is the quadrant at the diagonal position of the one quadrant.

[0012] According to at least one embodiment of the present disclosure, the actuator is a piezoelectric ceramic actuator.

[0013] According to at least one embodiment of the present disclosure, a center position of the actuator and a center position between the first ball member and the second ball member are located on a straight line passing through a center point of the lens support tube.

[0014] According to at least one embodiment of the present disclosure, the first ball component and the second ball component respectively include three balls, the three balls are arranged along the optical axis direction, and the diameters of the upper ball and the lower ball are the same and larger than the diameter of the middle ball.

[0015] According to at least one embodiment of the present disclosure, the upper ball and the lower ball of the first ball component are in tight fitting contact with the outer wall of the lens support tube and the inner wall of the side wall portion of the base to avoid rotation of the lens support tube, and the upper ball and the lower ball of the second ball component are in margin installation fitting contact with the outer wall of the lens support tube and the inner wall of the side wall portion of the base to provide installation margin.

[0016] According to at least one embodiment of the present disclosure, the upper ball and the lower ball of the first ball member have at least two contact points with the outer side wall of the lens support tube, and at least two contact points with the inner side wall of the side wall portion of the base, and

[0017] The upper ball and the lower ball of the second ball member have at least one or two contact points with the outer side wall of the lens support tube, and at least one or two contact points with the inner side wall of the side wall portion of the base.

[0018] According to at least one embodiment of the present disclosure, a lens support tube position detection device is further included.

[0019] The lens support tube position detection device includes a Hall magnet and a Hall sensor, which are arranged opposite to each other. The Hall magnet is located on the lens support tube, and the Hall sensor is located on the inner side of the side wall.

[0020] According to at least one embodiment of the present disclosure, the lens support tube position detection device is located in other quadrants of the plane rectangular coordinate system outside the one quadrant and the other quadrant, and when observed from the top surface of the lens support tube, the lens support tube position detection device is located on a first straight line, which is parallel to the horizontal axis or the vertical axis of the plane rectangular coordinate system and passes through the center position of the guide support ball member.

[0021] According to at least one embodiment of the present disclosure, the first straight line passes through the center position of the first ball member.

[0022] According to yet another aspect of the present disclosure, a camera device includes:

[0023] The lens driving device as described above;

[0024] at least one lens fixed in the lens support tube; and

[0025] An image sensor receives light passing through the at least one lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0027] Figure 1 is a schematic exploded view of a lens driving device according to an embodiment of the present disclosure.

[0028] Figure 2 is a schematic exploded view of a lens driving device according to an embodiment of the present disclosure.

[0029] Figure 3 1 is a schematic top view of a lens driving device according to an embodiment of the present disclosure (excluding the housing).

[0030] Figure 4 1 is a left side schematic diagram showing the internal structure of a lens driving device according to one embodiment of the present disclosure.

[0031] Figure 5 is a schematic diagram of a piezoelectric actuator according to one embodiment of the present disclosure.

[0032] Figure 6 1 is a bottom view schematically showing the internal structure of a lens driving device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0036] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0037] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0038] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "above," "upper," "above," "higher," and "side (e.g., as in "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "above" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0039] Figure 1 and Figure 2is a schematic diagram of a lens driving device according to an embodiment of the present disclosure.

[0040] The lens driving device may include a lens supporting barrel 110, a base 120, an actuator 130, and a guide supporting ball member 140. In addition, the lens driving device may further include a housing 200.

[0041] The base 120 may include a bottom 121 and a side wall 122. The side wall 122 may extend from the periphery of the bottom 121 to the side wall 122. Figure 1 The lens support tube 110 extends in an upward direction as shown, thereby forming a space for accommodating the lens support tube 110.

[0042] The housing 200 may cover the upper side of the lens supporting tube 110 and the outer peripheral wall of the side wall portion 122 .

[0043] The actuator 130 may be located at the inner side of the sidewall portion 122 and the outer side of the lens supporting tube 110 .

[0044] The guide support ball member 140 may be in the form of a ball, and ball grooves are respectively provided on the lens support tube 110 and the side wall portion 122 to accommodate the guide support ball member 140 .

[0045] The lens support tube position detection device 150. Figure 3 As shown, the lens support tube position detection device 150 may include a Hall magnet 151 and a Hall sensor 152 . The Hall magnet 151 and the Hall sensor 152 are arranged opposite to each other. The Hall magnet 151 is located on the lens support tube 110 , and the Hall sensor 152 is located on the inner side of the side wall portion 122 .

[0046] Next, we will refer to Figure 3 A lens driving device according to one embodiment of the present disclosure will be described. The lens driving device is a device that drives a camera lens mounted on a mobile phone or the like. Figure 3 FIG. 4 shows a top view of the lens driving device. Figure 3 As shown, the lens driving device 100 may include a lens supporting tube 110 , a base 120 , an actuator 130 , and a guide supporting ball member 140 .

[0047] The lens support tube 110 can be used to hold at least one lens. The lens can be installed inside the lens support tube 110, and the optical function can be achieved by adjusting the position of the lens.

[0048] The base 120 may accommodate components such as the lens support tube 110 , the actuator 130 , and the guide support ball member 140 therein.

[0049] The base 120 may include a bottom 121 and a side wall 122 erected from the bottom. The side wall 122 may be provided over four sides of the bottom 121 and may be formed integrally with the bottom 121. The bottom 121 and the side wall 122 form a space for accommodating the lens support tube 110. The side wall 122 extends parallel to the optical axis direction of the lens.

[0050] The lens support tube 110 may have a cylindrical body portion, which is disposed in a space formed by the bottom 121 and the side wall portion 122. That is, a lens barrel including a lens is installed inside the body portion. The lens support tube 110 may move in the formed space by a driving force.

[0051] The actuator 130 applies a driving force to the lens support tube 110 so that the lens support tube 110 moves along the optical axis. The actuator 130 may include a first portion located on the side wall portion 122 of the base 120 and a second portion located on the lens support tube 110. The relative movement of the lens support tube 110 relative to the base 120 is achieved through the interaction between the first portion and the second portion.

[0052] According to an embodiment of the present disclosure, the actuator 130 may be a piezoelectric ceramic actuator, wherein the actuator 130 mainly includes a substrate 131 , a piezoelectric element 132 , and a silicone rubber 133 .

[0053] The substrate 131 may be a ceramic substrate, for example, may be supported by SiC or zirconia, etc. The substrate 131 may be formed integrally with the lens support tube 110 .

[0054] The silicon rubber 133 may be disposed on the sidewall portion 122 of the substrate.

[0055] like Figure 4 As shown, the ceramic substrate 131 on the lens support tube 110 can be pushed by the silicone rubber 133 behind the piezoelectric element 132. The piezoelectric element 132 can be divided into four areas. When the power is supplied in the power supply direction A, according to the displacement d31 (lateral displacement), the upper and lower charge pumps 134 perform the actions shown by the two dotted arrows, thereby interacting with the ceramic substrate to move the lens support tube 110 upward. When the power is supplied in the power supply direction B, the upper and lower charge pumps 134 perform the actions shown by the two realization arrows, thereby interacting with the ceramic substrate to move the lens support tube 110 downward.

[0056] like Figure 5 As shown, the guide support ball member 140 includes a first ball member 141 and a second ball member 142 .

[0057] The first ball member 141 may include an upper ball 1411, a middle ball 1412, and a lower ball 1413. The diameters of the upper ball 1411 and the lower ball 1413 may be the same and greater than the diameter of the middle ball 1412.

[0058] The second ball member 142 may include an upper ball 1421, a middle ball 1422, and a lower ball 1423. The diameters of the upper ball 1421 and the lower ball 1423 may be the same and greater than the diameter of the middle ball 1422.

[0059] like Figure 3 As shown, a ball groove can be provided on the outer side of the lens support tube 110 and the inner side of the side wall portion 122 of the base 120 to accommodate the above-mentioned ball. The first ball member 141 and the second ball member 142 are in contact with the outer side wall of the lens support tube 110 and the inner side wall of the side wall portion 122 of the base 120. When the lens support tube 110 moves relative to the side wall portion 122, the first ball member 141 and the second ball member 142 roll.

[0060] In this way, through the action of the actuator, the lens support tube 110 is moved along the optical axis under the positioning support of the ball.

[0061] like Figure 3 As shown, observed from the top surface of the lens support tube 110, the actuator 130 is located in one quadrant of the plane rectangular coordinate system XY, and the guide support ball member 140 is located in another quadrant of the plane rectangular coordinate system XY, and the other quadrant is a quadrant at a diagonal position of one quadrant.

[0062] like Figure 3 As shown in the figure, the guide support ball member 140 is located in the second quadrant, and the actuator 130 is located in the fourth quadrant. The guide support ball member 140 and the actuator 130 are located at the corners of their respective quadrants, that is, at the position where the lens support cylinder 110 and the side wall portion 122 of the respective quadrants are adjacent. Although the guide support ball member 140 is shown in the figure as being located in the second quadrant and the actuator 130 is located in the fourth quadrant, the technical solution disclosed in the present invention is not limited to this, as long as the two are located in two quadrants on the diagonal line.

[0063] According to an optional embodiment of the present disclosure, the center position of the actuator 130 and the center position between the first ball member 141 and the second ball member 142 are located on a straight line passing through the center point of the lens support tube 110 .

[0064] The upper ball 1411 and the lower ball 1413 of the first ball member 141 are in close contact with the outer wall of the lens support tube 110 and the inner wall of the side wall portion 122 of the base 120 to avoid rotation of the lens support tube 110.

[0065] The upper ball 1421 and the lower ball 1423 of the second ball member 142 are in contact with the outer wall of the lens support tube 110 and the inner wall of the side wall portion of the base 120 to provide installation margin.

[0066] The upper ball 1411 and the lower ball 1413 of the first ball member 141 have at least two contact points with the outer wall of the lens support tube 110 , and have at least two contact points with the inner wall of the side wall portion 122 of the base 120 .

[0067] For example Figure 3 As shown, the cross-sectional shape of the ball groove of the first ball member 141 is square, and the upper ball 1411 and the lower ball 1413 located in the square ball groove have two contact points with the side wall portion 122, and have two contact points with the outer side wall of the lens support tube 110. It should be understood by those skilled in the art that it can also be set to other shapes, for example, the ball groove of the outer side wall of the lens support tube 110 or the ball groove of the inner side wall of the side wall portion 122 of the base 120 can be set to a semicircular shape, etc. The set shape needs to prevent the lens support tube 110 from shaking in a direction perpendicular to the optical axis direction.

[0068] The upper ball 1421 and the lower ball 1422 of the second ball member 142 have at least one or two contact points with the outer wall of the lens support tube 110 , and have at least one or two contact points with the inner wall of the side wall portion 122 of the base 120 .

[0069] For example Figure 3 As shown, the shape of the ball groove of the second ball member 142 on one side of the lens support tube 110 is that two surfaces are in contact with the upper ball 1421 and the lower ball 1422, while the shape of the ball groove on the inner wall of the side wall portion 122 of the base 120 is flat, with only one surface in contact with the upper ball 1421 and the lower ball 1422, that is, there is only one contact point.

[0070] By arranging the first ball component 141 and the second ball component 142 and the corresponding ball grooves, the second ball component 142 can be placed after the first ball component 141 is placed (the first ball component 141 fits tightly with its ball groove), and when the second ball component 142 is placed into the ball groove, a larger installation margin is provided, thereby preventing the problem of the second ball component 142 being unable to be placed due to processing accuracy.

[0071] In addition, the middle balls 1412 and 1422 with smaller diameters in the first ball member 141 and the second ball member 142 can be used to assist the rotation of the upper balls and the lower balls.

[0072] According to a further embodiment of the present disclosure, the lens driving device according to the present disclosure may further include a lens support tube position detection device 150. Figure 3 As shown, the lens support tube position detection device 150 may include a Hall magnet 151 and a Hall sensor 152 . The Hall magnet 151 and the Hall sensor 152 are arranged opposite to each other. The Hall magnet 151 is located on the lens support tube 110 , and the Hall sensor 152 is located on the inner side of the side wall portion 122 .

[0073] The lens support tube position detection device 150 is located in a quadrant other than the quadrant where the actuator 130 is located and the quadrant where the guide support ball assembly 140 is located, and when observed from the top surface of the lens support tube, the lens support tube position detection device 150 is located on or near a first straight line 153, which is parallel to the horizontal axis X or the vertical axis Y of the plane rectangular coordinate system and passes through the center position of the guide support ball assembly 140.

[0074] In the present disclosure, it is preferred that the lens support tube position detection device 150 is disposed on or near a first straight line 153 passing through the ball center position of the first ball member 141 .

[0075] In the present disclosure, the Hall magnet 151 may be integrally formed on the lens supporting cylinder 110 .

[0076] By setting the lens support tube position detection device 150 in the above manner, the relative positions of the Hall magnet 151 and the Hall sensor 152 can be kept unchanged even when the guide support ball component 140 deviates from its position, thereby not affecting the Hall position detection.

[0077] In addition, if Figure 3 and Figure 6 As shown, the signal communication between the Hall sensor and the actuator and the external circuit can be realized through the flexible circuit board 160, for example, Figure 6 The interface terminal 161 is shown to be in communication with an external circuit.

[0078] According to another embodiment of the present disclosure, a camera device is provided, which includes the above-mentioned lens driving device; at least one lens fixed in the lens support tube; and an image sensor that receives light passing through the at least one lens.

[0079] According to yet another embodiment of the present disclosure, an electronic device is provided, which may include the camera device described above.

[0080] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0081] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0082] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

[0083] Description of Reference Numerals

[0084] 100 Lens drive device

[0085] 110 Lens support tube

[0086] 120 Base

[0087] 121 bottom

[0088] 122 side wall

[0089] 130 Actuator

[0090] 131 substrate

[0091] 132 Piezoelectric element

[0092] 133 Silicone rubber

[0093] 134 Charge Pump

[0094] 140 Guide support ball component

[0095] 141 first ball member

[0096] 142 second ball member

[0097] 150 Lens support tube position detection device

[0098] 151 Hall magnet

[0099] 152 Hall sensor

[0100] 153 First Straight Line

[0101] 160 Flexible circuit board

[0102] 161 Interface

[0103] 200 Shell

[0104] 1411 Upper ball

[0105] 1412 Middle Ball

[0106] 1413 Lower ball

[0107] 1421 Upper ball

[0108] 1422 Middle Ball

[0109] 1423Lower ball bearing.

Claims

1. A lens driving device, characterized in that: include: A lens support tube, wherein the lens support tube is used to hold at least one lens; A base having a side wall portion extending parallel to the optical axis direction of the lens; an actuator, wherein the actuator applies a driving force to the lens support tube so that the lens support tube moves along the optical axis direction; as well as The guide support ball component includes a first ball component and a second ball component, wherein the first ball component and the second ball component are in contact with the outer wall of the lens support tube and the inner wall of the side wall portion of the base, and when the lens support tube moves relative to the side wall portion, the first ball component and the second ball component roll. Among them, observed from the top surface of the lens support tube, the actuator is located in the corner of the fourth quadrant of the plane rectangular coordinate system, the guide support ball member is located in the corner of the second quadrant of the plane rectangular coordinate system, the second quadrant is the quadrant at the diagonal position of the fourth quadrant, the center position of the actuator and the center position between the first ball member and the second ball member are located on a straight line passing through the center point of the lens support tube, and the straight line is the diagonal line of the lens driving device.

2. The lens driving device according to claim 1, wherein: The actuator is a piezoelectric ceramic actuator.

3. The lens driving device according to claim 1, wherein: The first ball component and the second ball component respectively include three balls, the three balls are arranged along the optical axis direction, and the diameters of the upper ball and the lower ball are the same and larger than the diameter of the middle ball.

4. The lens driving device according to claim 3, wherein: The upper ball and the lower ball of the first ball component are in tight fit contact with the outer wall of the lens support tube and the inner wall of the side wall of the base to prevent the lens support tube from rotating, and the upper ball and the lower ball of the second ball component are in margin installation fit contact with the outer wall of the lens support tube and the inner wall of the side wall of the base to provide installation margin.

5. The lens driving device according to claim 4, characterized in that: The upper ball and the lower ball of the first ball member have at least two contact points with the outer side wall of the lens support tube, and at least two contact points with the inner side wall of the side wall portion of the base, and The upper ball and the lower ball of the second ball member have at least one or two contact points with the outer side wall of the lens support tube, and at least one or two contact points with the inner side wall of the side wall portion of the base.

6. The lens driving device according to claim 4 or 5, characterized in that: It also includes a lens support tube position detection device, The lens support tube position detection device includes a Hall magnet and a Hall sensor, which are arranged opposite to each other. The Hall magnet is located on the lens support tube, and the Hall sensor is located on the inner side of the side wall.

7. The lens driving device according to claim 6, wherein: The lens support tube position detection device is located in other quadrants of the plane rectangular coordinate system outside the fourth quadrant and the second quadrant, and when observed from the top surface of the lens support tube, the lens support tube position detection device is located on a first straight line, which is parallel to the horizontal axis or the vertical axis of the plane rectangular coordinate system and passes through the center position of the guide support ball component.

8. The lens driving device according to claim 7, wherein: The first straight line passes through the center position of the first ball member.

9. A camera device, characterized in that: include: The lens driving device according to any one of claims 1 to 8; at least one lens fixed in the lens support tube; as well as An image sensor receives light passing through the at least one lens.

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