JP2012047834A - Lens driving apparatus and camera module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens driving apparatus in which a lens having large outer diameter can be used, adjustment of the back focus is facilitated and the useless consumption of lenses can be suppressed, and also to provide a camera module.SOLUTION: The lens driving apparatus includes: a cemented lens 10; a lens holding member 20 which holds the cemented lens 10; and a holder 30 which holds the lens holding member 20 and is driven in the optical axis direction of the cemented lens 10. The lens holding member 20 holds the cemented lens 10 by being stacked on the cemented lens 10 in the optical axis direction. Moreover, the lens holding member 20 is attached into the holder 30 by screwing a thread part 22 into a thread part 32 so as to be movable in the optical axis direction, and so as to be attachable/detachable to/from the holder 30.

Description

  The present invention relates to a lens driving device and a camera module including the same.

  Conventionally, a camera module is mounted on a mobile phone or the like. Such a camera module includes a lens driving device. The lens driving device includes, for example, a lens, a barrel that supports the lens, a holder that supports the barrel, a base that supports the holder so as to be movable in the optical axis direction of the lens, and a base cover that supports the base from below the base. (For example, Patent Document 1). The barrel has a hollow cylindrical shape and is threaded on the outer surface. The inner surface of the holder is threaded so as to mesh with a screw formed on the outer surface of the barrel. The barrel is attached to the holder by screwing the barrel and the holder screws together.

  In the space inside the barrel, a plurality of lenses are supported so that the optical axis of each lens coincides with the central axis of the barrel (the central axis when the barrel is viewed as a cylinder). Since the barrel is supported by the holder via a screw, the barrel can be rotated to displace the relative position of the barrel with respect to the holder in the optical axis direction of the lens. Thereby, the position of the lens can be adjusted in the direction of the optical axis of the lens. By this adjustment, it is possible to adjust the back focus for imaging the light collected by the lens on the image sensor.

JP 2007-271821 A

  In the lens driving device, since the periphery of the lens is surrounded by the barrel, the outer diameter of the lens cannot be made larger than the inner diameter of the barrel. In this case, a configuration in which the barrel is omitted and the lens is directly attached to the holder may be employed. In this way, the diameter of the lens can be increased because there is no barrel.

  However, in this configuration, since the lens is directly bonded and fixed to the holder, it is difficult to displace the relative position of the lens with respect to the holder in the optical axis direction of the lens. For this reason, when the lens driving device having such a configuration is used in a camera module, it is difficult to adjust the back focus.

  In this configuration, since it is difficult to attach the lens to the lens driving device after the lens driving device is assembled, an operation test of the lens driving device is performed in a state in which the lens is incorporated in advance. Therefore, when it is found that the lens driving device is defective after assembly, there is a problem that the incorporated lens is discarded even if there is no problem with the lens.

  The present invention has been made to solve such a problem, a lens driving device and a camera that can use a large lens, can easily adjust back focus, and can suppress wasteful consumption of the lens. The purpose is to provide modules.

  A first aspect of the present invention relates to a lens driving device. The lens driving device according to this aspect includes a lens, a holding member that holds the lens, and a holder that holds the holding member and is driven in the optical axis direction of the lens. Here, the holding member holds the lens so as to be stacked on the lens in the optical axis direction. The holding member is attached to the holder so as to be movable in the direction of the optical axis and detachable from the holder.

  According to this configuration, since the holding member is configured to hold the lens so as to be stacked on the lens in the optical axis direction of the lens, the outer periphery of the lens is not covered by the holding member, and thus the diameter of the lens is increased. be able to. Further, since the holding member is mounted on the holder so as to be movable in the direction of the optical axis of the lens, the back focus can be adjusted when the lens driving device is mounted on the camera module. Further, since the holding member is attached to the holder so as to be detachable, the lens can be attached to the lens driving device after the lens driving device is assembled and the operation is confirmed. Therefore, useless consumption of the lens can be suppressed.

  In the lens driving device according to this aspect, the holding member and the holder may be configured to include screw portions that are screwed together. In this case, the holding member is attached to the holder by screwing these screw portions together.

  According to this configuration, the position of the lens in the optical axis direction can be adjusted by changing the screwing state of the screw portions formed on the holding member and the holder. Therefore, the back focus can be easily adjusted.

  The lens driving device according to this aspect may be configured such that a plurality of lenses are held by the holding member.

  In this case, the plurality of lenses may be integrated, and the light incident side surface of the lens closest to the light incident side may be fixed to the light emission side surface of the holding member.

  According to this configuration, the plurality of integrated lenses can be attached to the holding member only by fixing the lens closest to the light incident side to the holding member.

  In this configuration, the holding member is formed with a fitting portion into which the lens on the most light incident side is fitted, and when the lens on the most light incident side is fitted into the fitting portion, The optical axes of the plurality of lenses may be aligned with the central axis of the screw portion.

  According to this configuration, the optical axes of the plurality of integrated lenses can be adjusted by merely fitting the lens on the light incident side to the fitting portion.

  In this configuration, the lens having the smallest diameter among the plurality of lenses may be configured to be disposed on the light incident side.

  According to this configuration, since the holding member can be disposed on the outer periphery of the lens having the smallest diameter on the light incident side, the thread portion of the holding member can be reduced in the radial direction of the lens.

  In this case, the screw portion of the holding member may be disposed at a position closer to the light incident side than the side surface of the second lens from the light incident side of the plurality of lenses.

According to this configuration, since the holding member can be arranged in an empty space in the direction perpendicular to the optical axis between the first and second lenses from the light incident side, the large size of the lens driving device by the holding member. Can be suppressed.

  A second aspect of the present invention relates to a camera module. The camera module according to this aspect includes the lens driving device according to the first aspect.

  According to the camera module according to this aspect, the same effect as that of the first aspect can be obtained.

  As described above, according to the present invention, it is possible to provide a lens driving device and a camera module which can use a lens having a large aperture, can easily adjust the back focus, and can suppress wasteful consumption of the lens. it can.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example when the present invention is implemented, and the present invention is not limited to what is described in the following embodiment.

It is a disassembled perspective view which shows the structure of the lens drive device which concerns on embodiment. It is sectional drawing which shows the structure of the holder which concerns on embodiment, a cemented lens, and a lens holding member. It is a figure explaining the assembly process of the lens drive device which concerns on embodiment. It is a figure explaining the assembly process of the lens drive device which concerns on embodiment. It is a figure explaining operation | movement of the lens drive device which concerns on embodiment. It is a figure which shows the structure of the camera module which concerns on embodiment. It is sectional drawing which shows the structure of the holder which concerns on the example 1 of a change, a cemented lens, and a lens holding member. It is a figure explaining the assembly process of the lens drive device concerning the example 1 of a change. It is a disassembled perspective view which shows the structure of the lens drive device which concerns on the example 2 of a change. It is sectional drawing which shows the structure of the holder which concerns on the example 2 of a change, a cemented lens, and a lens holding member. It is a figure explaining the assembly process of the lens drive device concerning the example 2 of a change. It is a figure explaining the assembly process of the lens drive device concerning the example 2 of a change.

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

  FIG. 1 is an exploded perspective view showing the configuration of the lens driving device. FIG. 1A is an exploded perspective view seen from the upper side, and FIG. 1B is an exploded perspective view seen from the lower side.

  Referring to FIG. 1, the lens driving device includes a cemented lens 10, a lens holding member 20, a holder 30, a magnet 40, a shaft 50, a base 60, a coil 70, and a cover 80. .

  The cemented lens 10 includes lenses 11 to 14. The lens holding member 20 holds the cemented lens 10 and is attached to the holder 30.

The holder 30 is divided into two parts: a columnar part 30a having a substantially hollow cylindrical shape composed of approximately half of the upper side, and a prismatic part 30b consisting of the remaining approximately half of the lower side. Holder 3
0 has a symmetrical shape with respect to the central axis.

  An opening 33 leading to the lens housing portion 31 is formed in the central portion on the upper side of the cylindrical portion 30a. The prism portion 30b has a substantially square shape in plan view. More precisely, the prism 30b has an octagonal shape in which four corners are similarly cut off in plan view.

  FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1A for explaining the shapes of the cemented lens 10, the lens holding member 20, and the holder 30, and the assembly of these members. FIG. 2 (a) is a view before assembling these members, and FIG. 2 (b) is a view showing an arrangement of each member after assembling.

  With reference to FIG. 2A, the cemented lens 10 includes four lenses 11 to 14 and a clamp ring 15.

  The lenses 11 to 14 are stacked from the light incident side to the light emission side in the order of the lens 11, the lens 12, the lens 13, and the lens 14 so that the optical axes of the respective lenses coincide with each other and from the smallest outer diameter. These are integrated by being bonded and fixed to each other. The clamp ring 15 has a hollow cylindrical shape whose diameter is substantially the same as the diameter of the lens 14. A clamp ring 15 is mounted on the outer periphery of the light exit surface of the lens 14 so that the central axis coincides with the optical axes of the lenses 11-14. A diaphragm (not shown) is inserted between the lenses. In addition, a spacer for adjusting the distance between the lenses can be provided.

  In the present embodiment, the lens 11, the lens 12, the lens 13, and the lens 14 are formed with a lens portion having a curved surface at the center, and an assembly portion for stacking the lenses is formed on the outer peripheral side of the lens portion. Has been. The effective diameters of the lenses 11 to 14 are set in the lens portions of the lenses 11 to 14. The light passes through the central lens part and receives optical actions such as convergence and diffusion. Light that has passed through the lens portions of the lenses 11 to 14 is guided to a light receiving portion such as an image sensor.

  When the outer diameters of the lens 11, the lens 12, the lens 13, and the lens 14 (outer diameters of the assembly portion) are φ11, φ12, φ13, and φ14, respectively, φ11 <φ12 <φ13 <φ14. In the present embodiment, the lenses 11 to 14 are arranged so that the effective diameters are arranged in ascending order from the light incident side.

  The lens holding member 20 has a circular shape in plan view. In the center of the lens holding member 20, a circular hole 21 for allowing light to enter the lens driving device is formed. Further, the outer peripheral side surface of the lens holding member 20 is threaded to form a threaded portion 22.

  In the center of the bottom of the lens holding member 20, a circular recess 23 for fitting the uppermost part of the cemented lens 10 is formed. In addition, the above-mentioned hole 21 is connected to the center part of the recessed part 23, and light can penetrate now in the direction of the optical axis of a lens.

  The diameter of the recess 23 is substantially equal to the diameter of the circle formed by the outer periphery of the uppermost surface of the lens 11. As shown in FIG. 2B, the cemented lens 10 is attached to the lens holding member 20 so that the upper portion of the lens 11 is fitted into the recess 23. When the upper portion of the lens 11 is thus fitted into the recess 23, the central axis of the lens holding member 20 (the central axis of the screw portion 22) and the optical axis of the cemented lens 10 coincide. When the lens holding member 20 to which the cemented lens 10 is mounted is viewed from above, the central portion of the upper surface of the mounted lens 11 faces the outside from the hole 21 of the lens holding member 20.

The holder 30 includes a lens housing portion 31 for housing the cemented lens 10 at the center thereof. A screw portion 32 that is screwed into the screw portion 22 of the lens holding member 20 is formed on the innermost surface of the uppermost portion of the lens housing portion 31.

  The space formed by the lens housing portion 31 has a substantially cylindrical shape. More precisely, as shown in FIG. 2A, the lens housing part 31 has a plurality of cylindrical spaces having different diameters. These spaces are stacked so that the central axes thereof coincide with each other and are arranged in order from the light incident side from the smallest diameter.

  After the cemented lens 10 is mounted on the lens holding member 20 as described above, the screw portion 22 of the lens holding member 20 is screwed to the screw portion 32 of the holder 30, as shown in FIG. It is accommodated in the lens accommodating portion 31 of the holder 30. When the cemented lens 10 is housed in the lens housing portion 31 in this way, the optical axes of the lenses 11 to 14 coincide with the central axis of the holder 30. Moreover, the position of the lenses 11 to 14 with respect to the holder 30 can be changed in the optical axis direction by changing the screwed state of the screw portion 22 of the lens holding member 20 and the screw portion 32 of the holder 30. Thereby, the back focus adjustment (described later) for the lenses 11 to 14 can be performed.

  In the state where the cemented lens 10 is accommodated in the lens accommodating portion 31, a gap having a substantially constant width is provided between the cemented lens 10 and the side surface portion of the holder accommodating portion 31 as shown in FIG. It is formed.

  Further, as shown in FIG. 2B, the bottom portion of the clamp ring 15 is located above the bottom portion of the holder 30 in a state where the cemented lens 10 is accommodated in the holder 30.

  Returning to FIG. 1, the magnet 40 has a rectangular plate shape. The magnet 40 is magnetized so that one surface is an N pole and the other surface is an S pole.

  Magnet mounting portions 34 are formed on the four side surfaces of the prism 30b of the holder 30, respectively. The magnet mounting portion 34 is a recess, and the shape of the recess is substantially the same as the shape of the magnet 40. The magnets 40 are mounted and fixed to the magnet mounting portions 34 so that the south pole faces inward and the north pole faces outward. When the magnet 40 is mounted on the magnet mounting portion 34, the N pole side surface of the magnet and the side surface of the prism portion 30b are flush with each other.

  The shaft 50 has a round bar shape. Holes 35 penetrating in the direction of the central axis of the holder 30 are formed in two corners of the prism 30b of the holder 30 at diagonal positions. The two shafts 50 are each inserted into the holes 35. The inner diameter of the hole 35 is substantially the same as the diameter of the cross section of the shaft 50. The shaft 50 is used as a means for holding the holder 30 so as to be movable in the optical axis direction for focus adjustment.

  The base 60 has a box shape with an upper surface opened. The outer shape of the base 60 is a substantially rectangular parallelepiped. The base 60 includes a holder accommodating portion 61 for accommodating the holder 30. The shape of the holder accommodating portion 61 substantially matches the outer shape of the holder in plan view. A rectangular window 62 is formed on each side surface of the base 60.

  The coil 70 is wound around the base 60 in one direction so as to cover all the four window portions 62. When the holder 30 is accommodated in the base 60 with the magnet 40 mounted on the holder 30, the N-pole surface of the magnet 40 faces the coil 70 through the window 62. Each window 62 is larger than the N-pole surface of the magnet 40.

  In addition, a circular opening 64 is formed at the center of the bottom 63 of the base 60 to allow light incident from above to pass downward.

  The cover 80 has a box shape with an open lower surface, and has a substantially square shape in plan view. The cover 80 includes a base accommodating portion 81 for accommodating the base 60. The shape of the base accommodating portion 81 is substantially equal to the outer shape of the base 60. In the center of the upper surface of the cover 80, a circular opening 82 is formed for allowing the upper portion of the cylindrical portion 30a of the holder 30 to pass from below. The diameter of the opening 82 is slightly larger than the diameter of the cylindrical portion 30a.

  Two holes 65 into which the shaft 50 is fitted are formed at diagonal positions on the bottom 63 of the base 60. Similarly, two holes 83 into which the shaft 50 is inserted are formed at diagonal positions on the upper surface of the cover 80. In a state where the base 60 is fitted into the cover 80, the hole 65 and the hole 83 are formed to be at the same position in plan view. Further, the distance between the two holes 65 of the base 60 and the distance between the two holes 83 of the cover 80 are equal to the distance between the holes 35 formed in the holder 30.

  The shaft 50 is inserted into the hole 65 and the hole 83 at both ends so as to pass through the hole 35. Thus, when the shaft 50 is mounted, the shaft 50 is disposed in a direction parallel to the optical axis. As a result, the shaft 50 can hold the holder 30 so as to be displaceable in the direction of the optical axis. Further, when the base 60 is fitted into the cover 80, the base 60 is fixedly held by the cover 80, and the position of the shaft 50 is also fixed.

  In the present embodiment, the outer diameter of the cemented lens 10 (the diameter of the outermost periphery of the cemented lens in plan view) is smaller than the diameter of the opening 33 of the holder 30. Therefore, the cemented lens 10 can be accommodated in the lens accommodating portion 31 through the opening 33 of the holder 30.

  Next, with reference to FIGS. 3 and 4, the assembly process of the lens driving device will be described. 3A and 3B are perspective views of the state of the assembly process as viewed from above and below, respectively, and FIG. 4A is a view of the state before the cemented lens 10 is mounted as viewed from above. A perspective view and FIG.4 (b) are the perspective views which looked at the state at the time of assembly completion from the upper side.

  As shown in FIGS. 3A and 3B, when the lens driving device is assembled, the cemented lens 10 is attached to the lens holding member 20 as described above. Further, the holder 30 to which the magnet 40 is attached is accommodated in the holder accommodating portion 61 of the base 60. Further, the shaft 50 is inserted into the hole 35 from above, and the tip of the shaft 50 is fitted into the hole 65 formed in the base 60. A coil 70 is wound around the base 60.

  Next, as shown in FIG. 4A, the cover 80 is fitted into the base 60 from above, and at the same time, the upper end of the shaft 50 is fitted into the hole 83 formed in the cover 80. As a result, the upper portion of the cylindrical portion 30 a of the holder 30 faces the outside from the opening 82 of the cover 80.

  In this state, an operation test of the lens driving device is performed. If any abnormality is found in the lens driving device by the operation test, the cemented lens 10 is not attached to the lens driving device.

  If there is no abnormality in the lens driving device in the operation test, the lens holding member 20 to which the cemented lens 10 is attached is attached to the holder 30. In this case, the cemented lens 10 is accommodated in the holder 30 through the opening 33. Then, the screw portion 22 formed on the lens holding member 20 and the screw portion 32 formed on the uppermost portion of the holder 30 are screwed together, and the lens holding member 20 is attached to the holder 30. In this way, the cemented lens 10 is held by the holder 30 and the assembly of the lens driving device is completed as shown in FIG.

  When the lens driving device assembled in this way is incorporated into a camera module, for example, the back focus is adjusted. In this adjustment, the lens holding member 20 is rotated around the optical axis of the lens, and the screwing depth between the screw portion 22 of the lens holding member 20 and the screw portion 32 of the holder 30 is changed. Thereby, the position of the cemented lens 10 with respect to the holder 30 is displaced in the direction of the optical axis. In this way, the position of the cemented lens 10 is adjusted so that the position of the cemented lens 10 in the optical axis direction is displaced, and the light transmitted through the cemented lens 10 is best irradiated to the image sensor on the camera module side. Is done. By this adjustment, the cemented lens 10 is disposed at a position where the back focus is the best.

  FIG. 5 is a diagram for explaining the driving operation of the lens driving device in the assembled state. (A), (b) is a figure which shows typically the BB 'cross section of Fig.3 (a). In the figure, a black dot mark on the circle and a cross mark on the circle indicate the direction of current flow through the coil. A black dot mark on the circle indicates the direction in which the current flows toward the drawing referenceer, and a cross mark on the circle indicates the opposite direction. Further, in the figure, the cemented lens 10 is schematically shown by a broken line.

  As illustrated, the N pole of the magnet 40 faces the coil 70 wound around the base 60. In the state where the holder 30 is in the position (home position) shown in FIG. 5A, when a current in the direction shown in FIG. 5 flows through the coil 70, a propulsive force in the direction of the arrow in FIG. . The holder 30 receives this driving force and is displaced as shown in FIG. 5B, and the cemented lens 10 is also displaced accordingly.

  When the application of current to the coil 70 is stopped, the above-mentioned driving force is lost. In this case, the holder 30 and the cemented lens 10 are held at a position when application of current is stopped by a frictional force between the hole 35 and the shaft 50.

  In the state shown in FIG. 5B, when a current in the direction opposite to the above is applied to the coil 70, the holder 30 is displaced in the direction toward the home position, and accordingly, the cemented lens 10 is also displaced.

  In this way, the cemented lens 10 is positioned at the on-focus position by displacing the holder 30 in the optical axis direction.

  FIG. 6 is a diagram showing a schematic configuration of a camera module on which the lens driving device having the above configuration is mounted. In the figure, reference numeral 100 denotes a lens driving device.

  A base cover 101 is attached to the lower surface of the base 60. The base cover 101 has an opening (not shown) through which light passes in the center.

  Below the base cover 101, a circuit board 103 on which an image sensor 102 is mounted is disposed. The base 60 is provided with a hall element 104 as a position sensor, and the position of the holder 30 is detected based on a signal from the hall element 104.

During the focus operation, a CPU (Central Processing Unit) 105 controls the driver 106 to displace the holder 30 from the home position to a predetermined position in the optical axis direction of the lens. At this time, the position detection signal from the hall element 104 is input to the CPU 105, and at the same time, the CPU 105 processes the input signal from the image sensor 102 to acquire the contrast value of the captured image. Then, the position of the holder 30 having the best contrast value is acquired as the on-focus position.

Thereafter, the CPU 105 drives the holder 30 so that the holder 30 is positioned at the acquired on-focus position. The CPU 105 monitors the signal from the hall element 104 and drives the holder 30 until the signal from the hall element 104 indicates a state corresponding to the on-focus position. Thereby, the holder 30 is positioned at the on-focus position.

  As described above, according to the present embodiment, since the lens holding member 20 is configured to hold the lens so that the cemented lens 10 is stacked in the optical axis direction of the lens, the outer periphery of each of the lenses 11 to 14 is the lens holding member 20. Therefore, the apertures of the lenses 11 to 14 can be increased.

  In addition, according to the present embodiment, the cemented lens 10 can be moved in the direction of the optical axis of the lens by adjusting the screwing depth of the screw portion 22 of the lens holding member 20 and the screw portion 32 of the holder 30. As described above, since the lens 30 is attached to the holder 30 via the lens holding member 20, the back focus can be easily adjusted when the lens driving device is attached to the camera module.

  Further, according to the present embodiment, since the cemented lens 10 and the lens holding member 20 are detachably attached to the holder by screwing of the screw portion 32 and the screw portion 21, before the cemented lens 10 is assembled. After the operation test of the lens driving apparatus is performed, the cemented lens 10 can be assembled. Therefore, useless consumption of the cemented lens 10 can be suppressed.

  As described above, according to the present embodiment, a lens driving device and a camera module that can use a large lens for the lens driving device, can easily adjust the back focus, and can suppress wasteful consumption of the lens. Can be provided.

  Further, according to the present embodiment, the plurality of integrated lenses 11 to 14 can be attached to the lens holding member 20 simply by fixing the lens 11 closest to the light incident side to the lens holding member 20. Can do. In addition, according to the present embodiment, the light of the integrated lenses 11 to 14 can be obtained simply by fitting the uppermost portion of the lens 11 on the light incident side into the concave portion 23 of the lens holding member 20. The axis can be aligned with the central axis of the lens holding member 20.

  Further, according to the present embodiment, since the lens holding member 20 is disposed on the outer periphery of the lens 11 having the smallest diameter, the screw portion 22 of the lens holding member 20 can be reduced in the radial direction of the cemented lens 10. . According to the present embodiment, since the lens holding member 20 is arranged in the empty space in the direction perpendicular to the optical axis between the first lens 11 and the second lens 12 from the light incident side, the lens holding An increase in the size of the lens driving device 100 "by the member 20 can be suppressed.

<Modification 1>
In the above embodiment, the cemented lens 10 is accommodated in the holder 30 from above the holder 30. On the other hand, in this modified example, the cemented lens 10 is accommodated in the holder 30 from below the holder 30.

  FIG. 7 is a cross-sectional view illustrating the shapes of the cemented lens 10, the lens holding member 20, and the holder 30, and the assembly of these members. Fig.7 (a) is a figure before the assembly of these members, FIG.7 (b) is a figure which shows the mode of arrangement | positioning of each member after an assembly. FIG. 7 corresponds to FIG. 2 in the above embodiment.

  Referring to FIG. 7A, the cemented lens 10 includes four lenses 11 to 14 and a clamp ring 15 as in the above embodiment. This modified example is different from the above embodiment in that the outermost diameter of the cemented lens 10 is larger than the diameter of the screw portion 32 of the holder 30. Further, the diameters of the lenses 11 to 14 are different from those of the above embodiment.

  In this modified example, when the lens driving device is assembled, the cemented lens 10 cannot be accommodated in the lens accommodating portion 31 of the holder 30 through the opening 33 of the holder 30 as shown in FIG. Therefore, in this modified example, as shown in FIG. 8A, the diameter of the opening 64 formed on the bottom surface of the base 60 is wider than that in the above embodiment, and the cemented lens 10 is attached to the holder from the opening 64. 30.

  Also in this modified example, the operation of the lens driving device is confirmed in the state before the cemented lens 10 is mounted, as in the above embodiment. Thereafter, the lens holding member 20 to which the cemented lens 10 is attached is accommodated in the holder 30 from the opening 64 on the bottom surface side of the base 60. Then, the screw portion 22 of the lens holding member 20 is screwed into the screw portion 32 of the holder 30, and the cemented lens 10 is held by the holder 30. Thereby, as shown in FIG.8 (b), the assembly of a lens drive device is completed.

  Also in this modified example, the back focus is adjusted by changing the threading depth of the screw portion 22 of the lens holding member 20 and the screw portion 32 of the holder 30 as in the above embodiment.

<Modification 2>
In the above embodiment, the screw portion 22 of the lens holding member 20 is outward. On the other hand, in the present modified example, the screw portion 22 of the lens holding member 20 is inward. Therefore, the screw portion 32 of the holder 30 is outward. Other configurations in this modification are the same as those in the above embodiment.

  9 to 12 are diagrams showing the configuration of this modification. FIGS. 9A and 9B are diagrams corresponding to FIGS. 1A and 1B in the above embodiment, and FIGS. 10A and 10B are FIGS. 2A and 2B in the above embodiment. ), FIG. 11A and FIG. 11B are diagrams corresponding to FIG. 3A and FIG. 3B in the above embodiment, and FIG. FIG. 5 is a diagram corresponding to FIGS. 4A and 4B in the embodiment.

  As shown in FIGS. 9A and 9B, the lens holding member 20 in this modified example has a larger diameter than the above embodiment. As shown in FIGS. 10A and 10B, the screw portion 22 of the lens holding member 20 in this modified example is inward, and the screw portion 32 of the holder 30 is outward. The lens holding member 20 to which the cemented lens 10 is attached is attached to the holder 30 by screwing the screw portion 22 of the lens holding member 20 with the screw portion 32 of the holder 30. Thereby, the cemented lens 10 is held by the holder 30.

  Also in this modified example, the operation of the lens driving device is confirmed in the state before the cemented lens 10 is mounted (see FIG. 12A), as in the above embodiment. Thereafter, the lens holding member 20 to which the cemented lens 10 is attached is accommodated in the holder 30 through the opening 33. Then, the screw portion 22 of the lens holding member 20 is screwed into the screw portion 32 of the holder 30, and the cemented lens 10 is held by the holder 30. Thereby, as shown in FIG.12 (b), the assembly of a lens drive device is completed.

  Also in this modified example, the back focus is adjusted by changing the threading depth of the screw portion 22 of the lens holding member 20 and the screw portion 32 of the holder 30 as in the above embodiment.

The embodiment and the modification of the present invention have been described above. However, the present invention is not limited to the embodiment and the modification, and the embodiment of the present invention is not limited to the above. Is possible.

  For example, in the above-described embodiments and modifications, the lenses 11 to 14 are arranged so that the outer diameters are arranged in ascending order from the light incident side. However, the arrangement order of the lenses 11 to 14 is various in addition to the above. Can be changed. However, in order to reduce the size of the lens holding member 20, it is desirable to attach a lens having an outer diameter as small as possible to the lens holding member.

  In the embodiment and the modification, the lens holding member 20 is attached to the lens closest to the light incident side, but the lens holding member 20 is attached to the lens closest to the light emission side. good.

  Moreover, in the said embodiment, although the one magnet 40 was arrange | positioned at one side of the holder 30, you may make it arrange | position two or more magnets on each side.

  Further, although the magnet 40 is disposed on the prism 30b of the holder 30, a portion corresponding to the prism 30b of the holder 30 may be changed to a cylindrical shape. An arc-shaped magnet that extends along the line may be mounted. In this case, the magnet mounting portion 34 is also formed in an arc shape. The base 60 is also formed so that the coil 70 is wound in a circular shape.

  Further, the number of lenses accommodated in the holder 30 is not limited to four, and may be other numbers.

  Furthermore, the shapes of the holder 30 and the base 60 are not limited to the above, and can be changed as appropriate. The diameters of the two shafts 50 may not be the same, and the holder 30 may be guided in the optical axis direction of the lens by a guide mechanism other than the shafts.

  The lens holding member 20 and the lens can be fixed by a method such as adhesion or press-fitting with an adhesive. For example, in the case of bonding with an adhesive, in FIG. 2B, the lens holding member 20 and the lens 11 are fixed by interposing an adhesive between the lens holding member 20 and the lens 11 facing each other. You can go. Further, referring to FIGS. 2A and 2B, the lens 11 and the lens holding member are held by interposing an adhesive in a region BD sandwiched between the outer peripheral surface 11P of the lens 11 and the bottom surface 20B of the lens holding member 20. The member 20 may be fixed. That is, the outer peripheral surface 11P of the lens 11 and the bottom surface 20B of the lens holding member 20 may be fixed with an adhesive.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

DESCRIPTION OF SYMBOLS 100 ... Lens drive device 10 ... Joint lens (lens)
20 ... Lens holding member (holding member)
22 ... Thread part 23 ... Recessed part (fitting part)
30 ... Holder 32 ... Screw part

Claims (7)

A lens,
A holding member for holding the lens;
A holder that holds the holding member and is driven in the optical axis direction of the lens,
The holding member is attached to the holder so as to hold the lens so as to be stacked on the lens in the optical axis direction, and to be movable in the direction of the optical axis and detachable from the holder.
A lens driving device. The lens driving device according to claim 1,
The holding member and the holder include screw portions that are screwed together,
The holding member is attached to the holder by screwing these screw portions together.
A lens driving device. The lens driving device according to claim 2,
A plurality of lenses are held by the holding member, and the plurality of lenses are integrated, and a light incident side surface of the lens closest to the light incident side is fixed to a light emitting side surface of the holding member. The
A lens driving device. The lens driving device according to claim 3,
The holding member is formed with a fitting portion into which the lens on the light incident side is fitted, and when the lens on the light incident side is fitted into the fitting portion, the screw portion of the holding member is The optical axes of the plurality of lenses are aligned with a central axis;
A lens driving device. The lens driving device according to claim 3 or 4,
The lens having the smallest diameter among the plurality of lenses is arranged on the light incident side,
A lens driving device. The lens driving device according to claim 5,
The screw portion of the holding member is disposed at a position closer to the light incident side than the side surface of the second lens from the light incident side of the plurality of lenses.
A lens driving device.   A camera module comprising the lens driving device according to claim 1.

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