CN116299938A - Lens driving device, camera device and electronic equipment - Google Patents

Abstract

The utility model provides a lens driving device, a camera device and an electronic device, which can reduce the displacement and the change of inclination when a moving body moves even if the moving body is subjected to impact due to falling and the like. A lens driving device (10) comprises a fixed body (12) having a base (64), and a movable body (14) having a lens support (16) for supporting a lens, wherein a guide shaft (92) is provided on the base (64), one end of the guide shaft is fixed to the base (64) and stands up parallel to the optical axis direction of the lens, the movable body (14) is formed with two guide walls facing each other in a direction orthogonal to the optical axis direction of the lens, the guide shaft (92) is interposed between the two guide walls, and at least the upper sides of the two guide walls facing each other in the optical axis direction are connected by an upper connecting portion.

Description

Lens driving device, camera device and electronic equipment

Technical Field

The utility model relates to a lens driving device, a camera device and an electronic device.

Background

A small camera device is mounted on an electronic device such as a mobile phone or a smart phone. Such a small camera is known to have a lens driving device having an autofocus function as shown in patent document 1. The auto-focusing function is achieved by driving a moving body having a lens support body supporting a lens toward a base of a fixed body. The lens driving device is provided with a driving mechanism for driving the movable body to the base.

[ Prior Art literature ]

[ patent literature ]

[ patent document 1 ] chinese utility model CN210742590U specification.

Disclosure of Invention

[ problem to be solved by the utility model ]

However, even if the guide shaft is firmly fixed to the base, if the lens driving device is subjected to an impact due to a fall or the like, there is a problem in that the moving body side guide wall supporting the guide shaft may be bent or widened, and the contact state with the guide shaft is changed, so that the displacement and inclination of the moving body at the time of the moving action are changed.

The present utility model aims to provide a lens driving device, a camera device and an electronic device capable of reducing the displacement and the change of inclination when a moving body moves even if the moving body is subjected to impact due to falling and the like.

[ technical solution ]

One aspect of the present utility model is a lens driving device including a fixed body having a base, a movable body having a lens support for supporting a lens, a guide shaft provided on the base, one end of the guide shaft being fixed to the base and standing upward in parallel with an optical axis direction of the lens, the movable body being formed with two guide walls facing each other in a direction orthogonal to the optical axis direction of the lens, the guide shaft being interposed between the two guide walls, and at least upper sides of the two guide walls facing each other being connected by an upper connecting portion in the optical axis direction.

Preferably, the guide shaft has a main guide shaft inserted into a guide hole formed in the moving body, and a sub guide shaft inserted into the guide wall.

Preferably, the upper connecting portion is formed so that an upper opening portion of the guide wall is entirely closed. Further, preferably, the sub guide shaft is shorter than the main guide shaft. Further, preferably, a lower side of the guide wall in the optical axis direction is contacted by a lower connecting portion. The guide walls protrude from each other in a plane or a curved surface, and the optical axis direction central portion is brought into contact with the guide shaft. Preferably, the guide wall is formed on a surface parallel to a predetermined one of directions orthogonal to the optical axis direction. Preferably, the base includes a base body made of resin and a support plate made of metal embedded in the base body, and the guide shaft is fixed to the support plate.

Another aspect of the present utility model is a photographic apparatus having the lens driving device, a lens supported by the lens support.

Another aspect of the present utility model is an electronic apparatus having the camera device.

[ Effect of the utility model ]

According to the present utility model, since at least the upper sides of the two guide walls facing each other in the optical axis direction are connected by the upper connecting portion, the strength of the guide walls is improved, and even if an impact is applied due to a fall or the like, the displacement and the change in inclination during the movement of the movable body can be reduced.

Drawings

Fig. 1 is an oblique view of a lens driving device according to an embodiment of the present utility model, as seen from obliquely above.

Fig. 2 is an oblique view of a lens device according to an embodiment of the present utility model, as seen obliquely from below.

Fig. 3 is an exploded perspective view of the lens driving device according to the embodiment of the present utility model, when the fixed body and the movable body are detached, from each other from the obliquely upward direction.

Fig. 4 is an exploded perspective view of the lens driving device according to the embodiment of the present utility model, taken from above obliquely, after all the components are removed.

Fig. 5 is an exploded perspective view of the lens driving device according to the embodiment of the present utility model, taken from obliquely below, after all the components are removed.

Fig. 6 is an exploded perspective view of a base used in the lens driving device according to the embodiment of the present utility model, taken out of the base body and the support plate, and viewed obliquely from above.

Fig. 7 is a plan view showing a part of a lens driving device according to an embodiment of the present utility model.

Fig. 8 is a cross-sectional view taken along line A-A of fig. 7.

Fig. 9 is a sectional view taken along line B-B of fig. 7.

Fig. 10 is an enlarged perspective view showing a guide wall used in the lens driving device according to the embodiment of the present utility model.

Detailed Description

Hereinafter, embodiments of the present utility model will be described with reference to the drawings.

In fig. 1 to 5, a lens driving apparatus 10 according to an embodiment of the present utility model is shown. The lens driving device 10 is used together with a lens in a camera device mounted on an electronic device such as a smart phone.

The lens driving device 10 includes a fixed body 12 and a movable body 14 supported so as to be movable relative to the fixed body 12. As shown in fig. 4 and 5, the movable body 14 includes a lens support 16 for supporting a lens, not shown, and a 1 st frame 18 surrounding the lens support 16. The lens support 16 and the 1 st frame 18 have a substantially rectangular outer shape when viewed from above.

In the specification, for convenience, the optical axis direction of the lens is the Z direction, the direction orthogonal to the optical axis direction is the X direction, and the direction orthogonal to the Z direction and the X direction is the Y direction. The object side of the optical axis is the upper side, and the side on which an image sensor, not shown, is disposed on the opposite side is the lower side.

A lens mounting hole 20 having a circular shape as viewed in the Z direction is formed inside the lens support 16, and a lens is mounted in the lens mounting hole 20.

The 1 st frame 18 is composed of a 1 st moving body plate 22, a 2 nd moving body plate 24, and a 1 st cover 26. The lens support 16, the 1 st movable body plate 22, and the 2 nd movable body plate 24 are made of engineering plastics such as Liquid Crystal Polymer (LCP), polyacetal, polyamide, polycarbonate, modified polyphenylene ether, and polybutylene terephthalate. Also, the 1 st cover 26 is made of, for example, metal. The 1 st movable body plate 22, the 2 nd movable body plate 24, and the 1 st cover 26 are formed with through holes 28,30, and 32, respectively, through which light passes. The through holes 28,30,32 are each formed in a generally circular shape.

The 1 st frame 18 supports the lens support 16 to be movable in the Y direction and the X direction. That is, the 1 st frame 18 has an orthogonal direction support mechanism 34, and the lens support 16 is freely movable in the XY direction by the orthogonal direction support mechanism 34.

The orthogonal direction support mechanism 34 is constituted by a 1 st support mechanism 36 and a 2 nd support mechanism 38 spaced apart in the Z direction. The 1 st support mechanism 36 is provided below the Z direction, and is constituted by a 1 st support portion 40 formed as a protrusion protruding in the-Z direction on the lower surface of the 1 st movable body plate 22, and a 1 st guide portion 42 formed as a groove recessed in the-Z direction on the upper surface of the 2 nd movable body plate 24. The 1 st support portion 40 is fitted into the 1 st guide portion 42. The 1 st support portion 40 and the 1 st guide portion 42 extend in the X direction and are formed near the four corners of the 1 st movable body plate 22 and the 2 nd movable body plate 24. Since the 1 st support portion 40 and the 1 st guide portion 42 extending in the X direction are fitted to restrict movement in the Y direction, the 1 st movable body plate 22 is free to move relative to the 2 nd movable body plate 24 only in the X direction.

The 2 nd support mechanism 38 is provided above the Z direction, and includes a 2 nd support portion 44 formed as a protrusion protruding in the +z direction on the upper surface of the 1 st moving plate 22, and a 2 nd guide portion 46 formed as a groove recessed in the +z direction on the lower surface of the lens support 16. The 2 nd support 44 is embedded in the 2 nd guide 46. The 2 nd support portion 44 and the 2 nd guide portion 46 extend in the Y direction and are formed near the four corners of the lens support 16 and the 1 st movable body plate 22. Since the 2 nd support portion 44 and the 2 nd guide portion 46 extending in the Y direction are fitted to restrict movement in the X direction, the lens support 16 is free to move relative to the 1 st movable body plate 22 only in the Y direction.

Mounting portions 48 are provided at four corners of the 1 st cover 26, and extend downward in the Z direction. The mounting portion 48 is formed with a rectangular mounting hole 50. Further, the mounted parts 52 are formed at four corners of the 2 nd movable body plate 24 so as to protrude laterally. The attached portion 52 is fitted into the attachment hole 50, and the 1 st cover 26 is fixed to the 2 nd movable body plate 24.

The 1 st magnet 54 and the 1 st yoke 56 are fixed to the +x-direction surface and the-Y-direction surface on the outer side of the lens support 16. The 1 st magnet 54 of the +x direction surface forms an S stage and an N stage in the X direction. The 1 st magnet 54 of the-Y direction surface forms the S-stage and the N-stage in the Y direction.

Further, the 2 nd magnet 58 and the 2 nd yoke 60 are fixed to the +y direction surface of the 2 nd movable body plate 24. The 2 nd magnet 58 is divided into two parts in the Z direction, and is formed into S-stage and N-stage in the Y direction, respectively, with polarities thereof being opposite up and down. A magnetic member 86 is fixed to the bottom surface of the 2 nd movable body plate 24, and corresponds to the lower side of the 1 st magnet 54. Thus, the lens support 16 is attracted to the 2 nd movable body plate 24 together with the 1 st movable body plate 22, and the movable bodies 14 are unified as one member.

The relationship between the fixed body 12 and the movable body 14 will be described later. The fixed body 12 has a 2 nd frame body 62. The 2 nd frame 62 surrounds the 1 st frame 18 of the movable body 14. The 2 nd frame body 62 has a base 64 and a 2 nd cover 66 attached to the base 64. The base 64 and the 2 nd cover 66 are rectangular in shape when viewed from above, and the 2 nd cover 66 is fitted to the outside of the base 64 to constitute the 2 nd frame 62. Further, through holes 72,74 for passing or inserting light are formed in the bottom surface 68 of the base 64 and the upper surface 70 of the 2 nd cover 66.

In addition, at four corners of the base 64, pillar portions 76 are formed to stand upward from the bottom surface portion 68, and the corners are sandwiched and divided into two. In order to surround the pillar portion 76, the flexible print substrate 78 is disposed outside the base 64. The flexible printed board 78 is bent into a rectangular shape, fixed to the post 76, surrounds the outer shape of the base 64, and has a terminal portion 80 formed at the lower portion thereof. The terminal portion 80 restricts the current flow to the 1 st coil 82 and the 2 nd coil 84 described later, but is not limited thereto.

Inside the flexible print substrate 78, the 1 st coil 82 is fixed to the +x direction portion and the-Y direction portion. Further, the 2 nd coil 84 is fixed to the +y direction portion inside the flexible print substrate 78. The 1 st coil 82 faces the 1 st magnet 54. The 2 nd coil 84 faces the 2 nd magnet 58.

A magnetic member 86 made of a magnetic material is provided outside the +y direction portion of the flexible print substrate 78. The magnetic member 86 faces the 2 nd magnet 58 with the flexible printed board 78 and the 2 nd coil 84 interposed therebetween. Since the magnetic flux from the 2 nd magnet 58 flows through the magnetic member 86, attractive force is generated between the 2 nd magnet 58 and the magnetic member 86. Therefore, the attractive force acts in the +y direction along the fixed body 12 on the movable body 14.

The movable body 14 is supported by the optical axis direction support mechanism 88 so as to be movable in the Z direction with respect to the fixed body 12. The optical axis direction supporting mechanism 88 is constituted by a main guide shaft 90 provided on the base 64, a 2 nd guide shaft 92, and a guide hole 114 and a guide wall 116 provided on the moving body 14.

The main guide shaft 90 and the sub guide shaft 92 are made of metal, and in this embodiment, are formed as a column extending in the Z direction.

The main guide shaft 90 and the sub guide shaft 92 have circular cross sections in the XY directions, but may have a part of a circle, or may have an elliptical shape or a polygonal shape other than a circle.

Regarding the main guide shaft 90 and the sub guide shaft 92, the lower end of the main guide shaft 90 is fixed near the-x+y direction end of the bottom surface portion 68 of the base 64, and the lower end of the sub guide shaft 92 is fixed near the +x+y direction both ends of the bottom surface portion 68 of the base 64. And, parallel to the Z direction, stands upward.

As shown in fig. 6, the base 64 is composed of a base body 98 and a metal support plate 100 fitted into the base body 98 at the bottom surface 68 of the base 64, and the base body 98 is composed of a resin. The base 64 is insert molded such that the periphery of the support plate 100 is fully inserted into the base body 98. The support plate 100 is integrally formed with the stay portion 76, and the stay portion 76 protrudes upward from the base body 98.

As shown in fig. 7 to 9, the main guide shaft 90 and the sub guide shaft 92 are integrally formed, and the guide shaft main body 102, the flange 104, and the insertion portion 106 are formed from the upper part to the lower part. An insertion portion 106 is formed at the lower ends of the main guide shaft 90 and the sub guide shaft 92, and a flange portion 104 is formed directly above the insertion portion 106. In order to make the insertion portion 106 easily stable in its posture at the time of assembly, the size thereof is thicker than the guide shaft body portion 102, and the flange portion 104 is thicker than the guide shaft body portion 102 and the insertion portion 106.

On the other hand, the 1 st insertion hole 108 is formed in the support plate 100 of the base 64, and the 2 nd insertion hole 110 is formed in the base body 98 so as to surround the 1 st insertion hole 108.

The insertion portions 106 of the main guide shaft 90 and the sub guide shaft 92 are inserted into the 1 st insertion hole 108 of the support plate 100, and protrude into the 2 nd insertion hole 110 of the base body 98. The flange 104 of the main guide shaft 90 and the sub guide shaft 92 is inserted into the 2 nd insertion hole 110 of the base body 98, and contacts the support plate 100 around the 1 st insertion hole 108 of the support plate 100.

The lower ends of the insertion portions 106 of the main guide shaft 90 and the sub guide shaft 92 are swaged to the support plate 100 to form a swaged portion 112, and the outer periphery of the 1 st insertion hole 108 of the support plate 100 is sandwiched between the swaged portion 112 and the flange portion 104, whereby the main guide shaft 90 and the sub guide shaft 92 are fixed to the support plate 100. The caulking portion 112 may be formed by a usual press working, but may be formed by a method called high-speed rotation or rotary caulking in order to reduce the influence of pressure on other portions. High-speed rotation or rotary caulking refers to a processing method of mashing a processed tip by a rotary tool.

The main guide shaft 90 is inserted into a guide hole 114 formed in the 2 nd moving body plate 24. The guide hole 114 is divided into upper and lower sides, and the main guide shaft 90 is in contact with the upper and lower sides of the guide hole 114. The guide hole 114 is formed in a V-shape extending in the +y direction as viewed in the Z direction. As described above, since the movable body 12 is attracted to the +y direction by the magnetic member 86 and the 2 nd magnet 58, the main guide shaft 90 contacts the V-shaped end surface of the guide hole 114, and the sliding position is ensured.

The sub guide shaft 92 is sandwiched by two guide walls 116 formed on the 2 nd moving body plate 24. The two guide walls 116 each form a parallel surface in the X direction. The guide walls 116 protrude from each other in a planar shape or a curved shape, and the center portion in the Z direction of the guide wall 116 is brought into contact with the sub guide shaft 92 from the +y side and the-Y side. Accordingly, the sub guide shaft 92 guides the moving body 14 while contacting the protruding portion of the guide wall 116.

The dimension of the sub guide shaft 92 in the Z direction is shorter than that of the main guide shaft 90. The two guide walls 116 are connected at the upper part by an upper connection 118. In this embodiment, the upper connection portion 118 is formed to entirely close the upper open portion of the guide wall 116. In addition, at the lower portion of the guide wall 116, except for the portion where the sub-guide shaft 92 is inserted, the periphery of the guide wall 116 is connected by a lower connecting portion 120, and the guide wall 116 is formed in a box shape by an upper connecting portion 118 and the lower connecting portion 120. Thus, the guide wall 116 is formed in a box shape, and thus the strength of the guide wall 116 is improved.

As shown in fig. 8 and 9, the height at which the guide wall 116 contacts the sub-guide shaft 92 is located between the heights of the two guide holes 114. Therefore, the upper end of the guide wall 116 that contacts the sub guide shaft 92 is often lower than the upper end of the upper guide hole 114, and the sub guide shaft 92 can be made shorter than the main guide shaft 90 to such an extent. Thereby, the upper connection portion 118 may be provided so as to cover the upper side of the sub guide shaft 92.

In this configuration, if the 1 st coil 82 is energized to face the 1 st magnet 54 on the X-direction surface, the 1 st coil 82 generates the lorentz force in the X-direction. Since the 1 st coil 82 is fixed to the base 64, the reaction force acting on the 1 st magnet 54 becomes a driving force with respect to the lens support 16 and the 1 st movable body plate 22, and the lens support 16 and the 1 st movable body plate 22 are supported by the 1 st support mechanism 36 to move in the X direction.

If the 1 st coil 82 is energized to face the 1 st magnet 54 on the Y-direction surface, a lorentz force in the Y-direction is generated in the 1 st coil 82. Since the 1 st coil 82 is fixed to the base 64, the reaction force acting on the 1 st magnet 54 acts as a driving force for the lens support 16, and the lens support 16 is supported by the 2 nd support mechanism 38 to move in the Y direction.

After the lens support 16 is moved to at least one side in the X direction or the Y direction, if the current supply to the 1 st coil 82 is stopped, the lens support 16 is stopped at the position where the current supply is stopped by the attractive force between the 1 st magnet 54 and the magnetic member 86 and the friction between the 1 st support 40 and the 1 st guide 42 and between the 2 nd support 44 and the 2 nd guide 46.

Then, if the 2 nd coil 84 arranged between the 2 nd magnet 58 and the magnetic member 86 is energized, a lorentz force in the Z direction is generated in the 2 nd coil 84. Since the 2 nd coil 84 is fixed to the base 64, the reaction force acting on the 2 nd magnet 58 becomes a driving force with respect to the movable body 14, and the movable body 14 is supported by the optical axis direction support mechanism 88 to move in the Z direction.

After the movable body 14 moves in the Z direction, if the current supply to the 2 nd coil 84 is stopped, the movable body 14 stops at the position where the current supply is stopped by the attraction force between the 2 nd magnet 58 and the magnetic member 86 and the friction between the main guide shaft 90 and the guide hole 114 and between the sub guide shaft 92 and the guide wall 116.

Further, the movable body 14 is supported and guided by the main guide shaft 90 and the sub guide shaft 92 on one side in the Y direction. The main guide shaft 90 and the sub guide shaft 92 are firmly fixed to the metal support plate 102 by caulking by the caulking portion 106, and therefore, even if the upper end is not fixed, the inclination thereof can be controlled.

Further, since the guide walls 116, 116 of the guide sub-guide shaft 92 are connected by the upper connecting portion 118 and the lower connecting portion 120, the strength of the guide walls 116, 116 is improved, and even if an impact is applied due to a fall or the like, the displacement and the change in inclination of the movable body 14 during the movement operation can be reduced.

In this embodiment, the lens driving device has a focus adjustment function and a shake compensation function, but may have only a focus adjustment function, and may be applied to a device having a zoom function. In this specification, the lens driving device used in the photographing device is described, but the present utility model is also applicable to other devices.

[ symbolic description ]

10. Lens driving device

12. Fixing body

14. Moving body

16. Lens support

18. No. 1 frame body

20. Hole for lens installation

22. No. 1 moving body plate

24. 2 nd moving body plate

26. No. 1 cover

28 Through holes 30,32

34. Orthogonal direction supporting mechanism

36. No. 1 supporting mechanism

38. No. 2 supporting mechanism

40. 1 st support part

42. 1 st guide part

44. 2 nd support part

46. 2 nd guide part

48. Mounting part

50. Mounting hole

52. Mounted part

54. 1 st magnet

56. 1 st yoke

58. 2 nd magnet

60. Yoke 2

62. No. 2 frame body

64. Base station

66. 2 nd cover cap

68. Bottom surface portion

70. Upper face

72 74 through holes

76. Pillar portion

78. Flexible printing substrate

80. Terminal part

82. 1 st coil

84. 2 nd coil

86. Magnetic component

88. Optical axis direction supporting mechanism

90. Main guide shaft

92. Auxiliary guide shaft

98. Base body

100. Supporting plate

102. Guide shaft body part

104. Flange part

106. Insertion part

108. 1 st insertion hole

110. 2 nd insertion hole

112. Rivet joint

114. Guide hole

116. Guide wall

118. Upper connecting part

120. Lower connecting part

Claims (10)

1. A lens driving device includes

A fixing body with a base,

A moving body having a lens support body for supporting the lens,

a guide shaft is provided on the base, one end of the guide shaft is fixed on the base and stands up parallel to the optical axis direction of the lens,

the movable body is formed with two guide walls facing each other in a direction orthogonal to an optical axis direction of the lens, the guide shaft is interposed between the two guide walls,

at least upper sides of the two guide walls facing each other in the optical axis direction are connected by an upper connecting portion.

2. The lens driving apparatus according to claim 1, wherein,

the guide shaft is provided with a main guide shaft and a secondary guide shaft,

the main guide shaft is inserted into a guide hole formed at the moving body,

the sub guide shaft is inserted into the guide wall.

3. The lens driving apparatus according to claim 1, wherein the upper connecting portion is formed so that an upper open portion of the guide wall is entirely closed.

4. A lens driving apparatus according to claim 3, wherein the sub guide shaft is shorter than the main guide shaft.

5. The lens driving apparatus according to claim 1, wherein a lower side of the guide wall in the optical axis direction is contacted by a lower connecting portion.

6. The lens driving apparatus according to claim 1, wherein the guide walls protrude from each other in a plane or a curved surface so that the optical axis direction central portion is in contact with the guide shaft.

7. The lens driving apparatus according to claim 1, wherein the guide wall is formed on a surface parallel to a predetermined one direction orthogonal to the optical axis direction.

8. The lens driving apparatus according to claim 1, wherein the base has a base body made of resin, a support plate made of metal embedded in the base body, and the guide shaft is fixed to the support plate.

9. A photographic apparatus comprising the lens driving device according to claim 1, and a lens supported by the lens support.

10. An electronic apparatus having the camera device according to claim 9.

Images