Lens driving device, camera device and electronic equipment

Abstract

The invention provides a lens driving device capable of suppressing inclination of a guide shaft, a photographing device and an electronic apparatus. The lens driving device comprises a base platform (66) with a bottom surface part (67), guide shafts (96) and (98) and a lens supporting body, the guide shafts (96) and (98) are vertically arranged relative to the bottom surface part (67) of the base platform (66), the lens supporting body is guided by the guide shafts (96) and (98), the base platform (66) is provided with a base platform body (100) and a supporting plate (102) which is arranged on the base platform body (100) and is made of metal, and one end of each guide shaft (96) and one end of each guide shaft (98) are fixed on the supporting plate (102).

Description

This application is a divisional application of the Chinese invention patent application filed on October 23, 2020, with the invention name “Lens drive device, camera device and electronic device” and application number 202011148511.X. [Technical field]

[0001] The invention relates to a lens driving device, a photographing device and an electronic device. [Background technology]

[0002] Electronic devices such as mobile phones and smart phones are equipped with small cameras. As for such small cameras, the camera with an autofocus function described in Patent Document 1 is well known. The autofocus function is achieved by moving a lens support body supporting the lens toward a base. As for the mechanism for allowing the lens support body to move freely toward the base, some adopt a method of erecting a guide shaft on the base to guide the lens support body. (For example, Patent Document 1). [Prior art literature] [Patent Literature]

[0003] [Patent Document 1] Korean Registered Patent No. 10-1200080 [Summary of the invention] [Technical Problems to be Solved by the Invention]

[0004] However, since the base is generally made of resin, the guide shaft and the base are poorly fixed to each other, and the guide shaft may be tilted due to the load from the lens and the lens support body.

[0005] The present invention aims to provide a lens driving device, a camera device and an electronic device capable of suppressing the inclination of a guide shaft.

Technical solution

[0006] One aspect of the present invention is a lens driving device, which includes a base having a bottom portion, a guide shaft arranged vertically relative to the bottom portion of the base, and a lens support body guided by the guide shaft. The base has a base body and a metal support plate arranged on the base body, and one end of the guide shaft is fixed to the support plate.

[0007] Preferably, the base body is made of resin, and the support plate is embedded in the base body. Furthermore, the support plate is formed around the entire circumference of the base.

[0008] Furthermore, preferably, the guide shaft comprises a guide shaft body portion and an insertion portion formed integrally with the guide shaft body portion, and the insertion portion is inserted into an insertion hole formed in the support plate. Furthermore, the insertion portion of the guide shaft is fixed to the support plate by riveting. Furthermore, the insertion portion may be thicker than the guide shaft body portion. Furthermore, the guide shaft forms a flange portion between the guide shaft body portion and the insertion portion, which is thicker than the guide shaft body portion and the insertion portion, and the flange portion may contact the support plate.

[0009] Another aspect of the present invention is a photographic device comprising the lens driving device and a lens supported by the lens support body.

[0010] Another aspect of the present invention is an electronic device including the camera device. [Effects of the invention]

[0011] According to the present invention, since the guide shaft is fixed to the metal support plate, the fixation of the guide shaft to the guide shaft base can be strengthened, and the inclination of the guide shaft can be suppressed.

Brief Description of the Drawings

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Explanation of symbols

[0013] Embodiments of the present invention will be described below with reference to the drawings.

[0014] Figures 1 to 14 Embodiments of the present invention are shown. Figure 1 A camera device 10 according to an embodiment of the present invention is shown. The camera device 10 includes a lens driving device 12 and a lens 14 attached to the lens driving device 12 .

[0015] The lens driving device 12 includes a fixed body 16 and a movable body 18 supported to be freely movable relative to the fixed body 16. The movable body 18 will be described first. Figure 2 as well as Figure 3 As shown, the moving body 18 has a lens support body 20 and a first frame body 22 surrounding the lens support body 20. When the lens support body 20 and the first frame body 22 are observed from above, they are basically in a quadrangular shape. Moreover, in this specification, for convenience, the optical axis direction of the lens 14 is referred to as the Z direction, the direction orthogonal to the optical axis direction is referred to as the X direction, and the direction orthogonal to the Z direction and the X direction is referred to as the Y direction. Moreover, the subject side of the optical axis is referred to as the upper side, and the opposite side (i.e., the side not shown in the figure and configured with the image sensor) is referred to as the lower side.

[0016] The lens support body 20 has a circular lens mounting hole 24 formed inside the lens support body 20 when viewed from the Z direction, and the lens 14 is mounted in the lens mounting hole 24 .

[0017] The first frame body 22 is composed of a first movable body plate 26, a second movable body plate 28 and a first cover 30. The lens support body 20, the first movable body plate 26 and the second movable body plate 28 are made of engineering plastics such as liquid crystal polymer (LCP), polyacetal, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, etc. Moreover, the first cover 30 is made of metal, for example. The first movable body plate 26, the second movable body plate 28 and the first cover 30 are respectively formed with openings 32, 34, 36 for allowing light to pass, and the openings 32, 34, 36 are respectively formed in a substantially circular shape.

[0018] The first frame body 22 supports the lens support body 20 to be movable in the Y direction and the X direction. That is, the first frame body 22 has an orthogonal direction support mechanism 38, and the lens support body 20 is movable in the XY directions through the orthogonal direction support mechanism 38.

[0019] The orthogonal direction support mechanism 38 is composed of a first support mechanism 40 and a second support mechanism 42 spaced apart in the Z direction. The first support mechanism 40 is arranged below in the Z direction. Figure 4 as well as Figure 5As shown, it is composed of a first support portion 44 protruding from the bottom of the first movable body plate 26 and a first guide portion 46 recessed on the top of the second movable body plate 28, and the first support portion 44 is embedded in the first guide portion 46. The first support portion 44 and the first guide portion 46 extend in the X direction and are formed near the four corners of the first movable body plate 26 and the second movable body plate 28. The first support portion 44 and the first guide portion 46 extending in the X direction are embedded in each other to limit movement in the Y direction, so that the first movable body plate 26 can move freely only in the X direction relative to the second movable body plate 28. The cross section of the first support portion 44 and the first guide portion 46 cut along the YZ plane (refer to Figure 5 ), surrounded by three orthogonal lines, and in the X direction, in surface contact with three planes (opposite side surfaces and the bottom).

[0020] The second supporting mechanism 42 is arranged above the Z direction. Figure 4 as well as Figure 5 As shown, it is composed of a second support portion 48 protruding from the upper surface of the first movable body plate 26 and a second guide portion 50 recessed from the lower surface of the lens support body 20, and the second support portion 48 is embedded in the second guide portion 50. The second support portion 48 and the second guide portion 50 extend in the Y direction and are formed near the four corners of the lens support body 20 and the first movable body plate 26. The second support portion 48 and the second guide portion 50 extending in the Y direction are embedded in each other to limit movement in the X direction, so that the lens support body 20 can move freely only in the Y direction relative to the first movable body plate 26. The cross section of the second support portion 48 and the second guide portion 50 cut along the XZ plane (refer to Figure 4 ), surrounded by three orthogonal lines, and in the Y direction, in surface contact with three planes (opposite side surfaces and the top surface).

[0021] The first cover 30 is provided with mounting portions 52 at four corners, extending downward in the Z direction. The mounting portions 52 are formed with mounting holes 54 in a quadrangular shape. Furthermore, mounting portions 56 are formed at four corners of the second movable body plate 28, protruding laterally. The mounting portions 56 are inserted into the mounting holes 54 to fix the first cover 30 to the second movable body plate 28. Between the lower surface of the first cover 30 and the upper surface of the lens support body 20, as shown in FIG. Figure 4 and Figure 5 As shown, a necessary minimum gap including errors due to tolerances etc. is formed to restrict the movement of the lens support 20 or the first movable body plate 26 relative to the second movable body plate 28 in the Z direction.

[0022] First magnets 58 are fixed to both surfaces in the X direction and one surface in the Y direction on the outside of the lens support 20. The first magnets 58, 58 on both surfaces in the X direction form S and N levels in the X direction. Furthermore, the first magnet 58 on one surface in the Y direction forms S and N levels in the Y direction.

[0023] Furthermore, first magnetic components 60, 60 composed of magnetic bodies are provided on both surfaces in the X direction below the second movable body plate 28. The first magnetic components 60, 60 face the first magnets 58, 58 on both surfaces in the X direction with the second movable body plate 28 sandwiched therebetween in the Z direction, and generate an attractive force between the first magnets 58, 58. As a result, the lens support 20 and the second movable body plate 28 are attracted with the first movable body plate 26 sandwiched therebetween, thereby maintaining the contact between the first support portion 44 and the first guide portion 46 and the second support portion 48 and the second guide portion 50 in the Z direction.

[0024] Furthermore, a second magnet 62 is fixed to the second movable body plate 28 on the outer surface opposite to the surface provided with the first magnet 58 in the Y direction. The second magnet 62 is divided into two parts in the Z direction, forming an S-level and an N-level in the Y direction, respectively, and the polarities thereof are opposite in the vertical direction.

[0025] The following describes the relationship between the fixed body 16 and the movable body 18. Figure 1 The fixed body 16 has a second frame body 64. The second frame body 64 surrounds the first frame body 22 of the movable body 16. The second frame body 64 has a base 66 and a second cover 68. The base 66 and the second cover 68 are square when viewed from above, and the outer side of the base 66 is embedded in the second cover 68 to form the second frame body 64. In addition, through holes 70, 72 are formed on the bottom surface 67 of the base 66 and the upper surface 69 of the second cover 68 to allow light to pass through or insert the lens 14.

[0026] Moreover, if Figure 6 As shown in FIG. 1 , at the four corners of the base 66, support portions 71 stand upward from the bottom portion 67. In addition, opening portions 74 are formed between the support portions 71 and on the four sides of the base 66. The top of the opening portion 74 is open. An elastic printed substrate 76 is arranged outside the base 66 to surround the support portions 71 and the opening portion 74. That is, as shown in FIG. Figure 6 As shown, the elastic printed substrate 76 is bent into a quadrangular shape to surround the outer shape of the base 66, and at its lower part, a first terminal portion 78 is formed in the Y direction, and a second terminal portion 80 is formed opposite to the first terminal portion 78. Although the first terminal portion 78 is controlled to energize the first coil 82 at the back, and the second terminal portion 80 is controlled to energize the second coil 84 at the back, it is not limited to this.

[0027] On the inner side of the elastic printed substrate 76, the first coil 82 is fixed on both surfaces in the X direction and one surface in the Y direction. Moreover, on the other surface in the Y direction of the inner side of the elastic printed substrate 76, the second coil 84 is fixed. Furthermore, on the inner side of the elastic printed substrate 76, an X-direction position detection element 86 is arranged on the middle side of one first coil 82 in the X direction, a Y-direction position detection element 88 is arranged on the middle side of the first coil 82 in the Y direction, and a Z-direction position detection element 90 is arranged on the side of the second coil 84. Moreover, the first coils 82, 82 arranged on both surfaces in the X direction are electrically connected in series.

[0028] The first coil 82, the X-direction position detection element 86, and the Y-direction position detection element 88 face the inner side of the base 66 through the opening 74, and are respectively opposite to the first magnet 58. Similarly, the second coil 84 and the Z-direction position detection element 90 face the inner side of the base 66 through the opening 74, and are opposite to the second magnet 62.

[0029] Moreover, if Figure 1 As shown, a second magnetic component 92 composed of a magnetic body is provided on the outer side of the elastic printed substrate 76. The second magnetic component 92 is opposite to the second magnet 62 with the elastic printed substrate 76 and the second coil 84 sandwiched therebetween, and the magnetic flux from the second magnet 62 flows through the second magnetic component 92, generating an attractive force between the second magnet 62 and the second magnetic component 92. For this reason, the movable body 18 generates an attractive force in the Y direction of the fixed body 16.

[0030] like Figure 1 As shown, the movable body 18 is supported by the optical axis direction support mechanism 94 and is free to move in the Z direction relative to the fixed body 16. The optical axis direction support mechanism 94 is composed of a first guide shaft 96 and a second guide shaft 98 provided on the fixed body 16 and a third support portion 128 and a fourth support portion 130 provided on the movable body 18.

[0031] The first guide shaft 96 and the second guide shaft 98 are made of metal and, in this embodiment, are cylindrical and extend in the Z direction. The first guide shaft 96 and the second guide shaft 98 are circular in cross section in the XY direction, but may be a part of a circle, or may be an ellipse or a polygon other than a circle.

[0032] The lower ends of the first guide shaft 96 and the second guide shaft 98 are fixed near the Y-direction end portion of the bottom surface portion 67 of the base 66 .

[0033] like Figure 6 to Figure 10As shown, the base 66 is composed of a base body 100 and a support plate 102 made of metal, the former being composed of resin and the latter being embedded in the base body 100 at the bottom portion 67 of the base 66. The base 66 is insert molded so that the support plate 102 is embedded in the base body 100. The support plate 102 is composed of a frame at four corners and is embedded around the entire circumference of the base body 100, forming a shape sandwiched on both sides of the base body 100 in the Z direction. Moreover, when manufacturing the base 66, the support plate 102 is connected to a frame-shaped body formed integrally with the support plate 102 through a connecting portion. As shown Figure 7 as well as Figure 8 As shown, cutouts 103 are formed to protrude from both sides of the support plate 102 in the X direction. The cutouts 103 are formed by cutting off the connection portion after the base 66 is insert molded.

[0034] The first guide shaft 96 and the second guide shaft 98 are formed integrally with a guide shaft body 104, a flange 106, and an insertion portion 108 from the top to the bottom. The insertion portion 108 is formed at the lower end of the first guide shaft 96 and the second guide shaft 98, and the flange 106 is formed slightly above the insertion portion 108. In order to stabilize the posture during assembly, the insertion portion 108 is slightly thicker than the guide shaft body 104, and the flange 108 is further slightly thicker than the guide shaft body 104 and the insertion portion 108.

[0035] On the other hand, the base 66 is Fig.11 As shown, a first hole 110 is formed in the support plate 102 , and a second insertion hole 112 and a third insertion hole 114 are formed on the upper and lower sides of the support plate 102 in the base body 100 to surround the first insertion hole 110 .

[0036] The insertion portion 108 of the first guide shaft 96 and the second guide shaft 98 is inserted into the first insertion hole 110 of the support plate 102, and protrudes toward the third insertion hole 114 of the base body 100. Furthermore, the flange portion 106 of the first guide shaft 96 and the second guide shaft 98 is inserted into the second insertion hole 112 of the base body 100, and contacts the support plate 102 around the first insertion hole 110 of the support plate 102.

[0037] The lower ends of the insertion portions 108 of the first guide shaft 96 and the second guide shaft 98 are riveted to the support plate 102 to form a riveted portion 116. Between the riveted portion 116 and the flange portion 106, the periphery of the first insertion hole 110 of the support plate 102 is clamped, and the first guide shaft 96 and the second guide shaft 98 are fixed to the support plate 102. The riveted portion 116 can be implemented by a conventional stamping process, or it can be formed by a method called high rotation or rotary riveting in order to reduce the pressure effect on other parts. High rotation or rotary riveting refers to a processing method in which the processing tip is crushed by a rotating tool.

[0038] like Figure 1 , Figure 12 to Figure 14 As shown, the upper ends of the first guide shaft 96 and the second guide shaft 98 are fixed on the second magnetic component 92. That is, the upper ends of the second magnetic component 92 are bent in the Y direction at both ends in the X direction to form upper fixing parts 118, 118, and the upper ends of the first guide shaft 96 and the second guide shaft 98 are inserted and fixed in the fourth insertion holes 120, 120 formed on the upper fixing parts 118, 118. In this embodiment, the second magnetic component 92 has the support function of the first guide shaft 96 and the second guide shaft 98. Compared with the case where a supporting component is separately provided, the number of components can be reduced, and it can stably support the first guide shaft 96 and the second guide shaft 98.

[0039] The third support portion 128 is as follows Fig.12 as well as Fig.13 As shown, there are first contact portions 122 and second contact portions 124 spaced apart in the Z direction. In this embodiment, the first contact portions 122 and the second contact portions 124 form circular holes, which are in contact with the outer surface of the first guide shaft 96 in the XY direction section of the first guide shaft 96 for 360 degrees.

[0040] Moreover, if Fig.12 as well as Fig.14 As shown, the cross section of the fourth support portion 130 in the XY direction is composed of two wall surfaces facing each other in the Y direction. In the fourth support portion 130, protrusions 126, 126 are formed on both side wall surfaces to protrude toward the second guide shaft 98 side curved surface. The center of the protrusions 126, 126 contacts the second guide shaft 98. The second guide shaft 98 contacts the fourth support portion 130 at two points in the Y direction to reduce friction resistance.

[0041] In the above structure, if the first coils 82, 82 facing the first magnets 58, 58 on the two X-direction surfaces intervening the Z-direction magnetic flux are energized, the Y-direction current flows through the first coils 82, 82, and according to Fleming's left-hand rule, the first coils 82, 82 generate a Lorentz force in the X-direction. The first coils 82, 82 are fixed to the base 66, so the reaction generated on the first magnets 58, 58 constitutes a driving force for the lens support 20 and the first movable body plate 26, and the lens support 20 and the first movable body plate 26 move in the X-direction while being supported by the first support mechanism 40.

[0042] Furthermore, if the first coil 82 facing the first magnet 58 on the Y-direction 1 surface that contains the Z-direction magnetic flux is energized, the current in the X-direction flows through the first coil 82, and according to Fleming's left-hand rule, a Lorentz force in the Y-direction is generated in the first coil 82. The first coil 82 is fixed on the base 66, so the reaction generated on the first magnet 58 constitutes a driving force relative to the lens support body 20, and the lens support body 20 moves in the Y-direction while being supported by the second support mechanism 42.

[0043] If one of the X direction or the Y direction stops supplying power to the first coil 82 after the lens support 20 moves, the lens support 20 stops at the position where power is stopped due to the attraction between the first magnets 58, 58 and the first magnetic components 60, 60, the friction between the first support portion 44 and the first guide portion 46, and the friction between the second support portion 48 and the second guide portion 50.

[0044] Thereafter, if the second coil 84 disposed between the second magnet 62 and the second magnetic member 92 and entraining the Y-direction magnetic flux is energized, the current in the X-direction flows through the second coil 84, and according to Fleming's left-hand rule, a Lorentz force in the Z-direction is generated in the second coil 84. The second coil 84 is fixed on the base 66, so the reaction generated on the second magnet 62 constitutes a driving force relative to the moving body 18, and the moving body 18 moves in the Z-direction while being supported by the optical axis direction support mechanism 94.

[0045] If the movable body 18 stops supplying power to the second coil 84 after moving in the Z direction, the movable body 18 stops at the position where power is stopped due to the attraction between the second magnet 62 and the second magnetic component 92, the friction between the first guide shaft 96 and the third support part 128, and the friction between the second guide shaft 98 and the fourth support part 130.

[0046] Here, the movable body 18 is supported and guided on one side in the Y direction by the first guide shaft 96 and the second guide shaft 98. The first guide shaft 96 and the second guide shaft 98 are fixed to a metal support plate 102, thereby suppressing the first guide shaft 96 and the second guide shaft 98 from tilting.

[0047] Furthermore, even if the third support portion 128 or the fourth support portion 130 is slightly deformed, the first guide shaft 96 and the second guide shaft 98 are shaped to extend in the Z direction, so that a continuous force is not generated locally along the Z direction on the first guide shaft 96 and the second guide shaft 98, thereby preventing a sudden change in movement due to the reciprocating movement of the movable body 18. Therefore, smooth movement of the lens support body 20 can be ensured.

[0048] Furthermore, the movable body 18 is supported by the optical axis direction support mechanism 94 provided on the Y direction side, and since the movable body 18 is provided with the first magnet 58 and the like, and is heavy, a moment of downward drooping in the Z direction is generated. However, since the optical axis direction support mechanism 94 is supported by the first guide shaft 96 and the second guide shaft 98 extending in the Z direction, the above-mentioned drooping can be reduced compared with the conventional support by the sphere.

[0049] Moreover, in this embodiment, the lens driving device 12 has a focus adjustment function and a shake compensation function, but it may only have one function, and thus may be applicable to a device having a push-pull lens function. Moreover, in this specification, the lens driving device 12 used in the photographing device 10 is described, but the present invention may also be applicable to other devices.

Claims

1. A lens driving device, characterized in that: It includes A base having a bottom portion, a guide shaft vertically arranged relative to the bottom portion of the base, a lens support body guided by the guide shaft, The base comprises a base body and a metal support plate arranged on the base body, one end of the guide shaft is fixed on the support plate. The guide shaft comprises a guide shaft body and an insertion portion formed integrally with the guide shaft body, wherein the insertion portion is inserted into an insertion hole formed in the support plate. The guide shaft forms a flange portion between the guide shaft body portion and the insertion portion. The flange portion is thicker than the guide shaft body portion and the insertion portion, and the flange portion contacts the support plate.

2. The lens driving device according to claim 1, characterized in that: The base body is made of resin, and the support plate is embedded in the base body.

3. The lens driving device according to claim 1, characterized in that: The support plate is formed around the entire circumference of the base.

4. The lens driving device according to claim 1, characterized in that: The insertion portion of the guide shaft is riveted and fixed to the support plate.

5. A photographic device, characterized in that: A lens driving device according to any one of claims 1 to 4, and a lens supported by the lens supporting body.

6. An electronic device, characterized in that: A photographic device as claimed in claim 5.

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