Optical component driving device, camera device and electronic equipment

Abstract

Provided are an optical component driving device, a camera device, and an electronic device capable of precise position control. The optical component driving device includes a sensor substrate for fixing an image sensor, a first sliding body fixed on the sensor substrate, a second sliding body for keeping the first sliding body slidable in a first direction orthogonal to the optical axis direction of a lens body, a third sliding body fixed on a lens assembly and keeping the second sliding body slidable in the optical axis direction of the lens body and in a second direction orthogonal to the first direction, a first convex portion extending in a first direction is formed on one of the first sliding body and the second sliding body, a first concave portion embedded in the first convex portion is formed on the other of the first sliding body and the second sliding body, a second convex portion extending in a second direction is formed on one of the second sliding body and the third sliding body, and a second concave portion embedded in the second convex portion is formed on the other of the second sliding body and the third sliding body.

Description

[Technical field]

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

[0002] Small cameras are mounted on electronic devices such as mobile terminals and smartphones. As is well known, such small cameras have a shake compensation function as shown in Patent Document 1. Among the technologies for implementing the shake compensation function, there is a technique called sensor shift. This sensor shift is a method of moving an image sensor in a direction orthogonal to the optical axis of a lens (e.g., Patent Document 1).

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2013-50668 [Summary of the invention]

[0006] [Technical Problems to be Solved by the Invention]

[0007] However, in the above conventional case, since the lens support body is suspended by four thin wires and shaken, the sensor substrate rotates unexpectedly, making it difficult to perform precise position control.

[0008] The present invention aims to provide an optical component driving device, a camera device and an electronic device capable of performing precise position control.

[0009]

Technical solution

[0010] One aspect of the present invention is an optical component driving device, which includes a lens assembly in which a lens body is provided, a sensor substrate fixed to an image sensor for detecting light input from the lens body through the lens assembly, a first sliding body fixed to the sensor substrate, a second sliding body that keeps the first sliding body slidable in a first direction orthogonal to the optical axis direction of the lens body, and a third sliding body that is fixed to the lens assembly and keeps the second sliding body slidable in the optical axis direction of the lens body and in a second direction orthogonal to the first direction, a first convex portion extending in the first direction is formed on one of the first sliding body and the second sliding body, a first concave portion embedded in the first convex portion is formed on the other of the first sliding body and the second sliding body, a second convex portion extending in the second direction is formed on one of the second sliding body and the third sliding body, and a second concave portion embedded in the second convex portion is formed on the other of the second sliding body and the third sliding body.

[0011] Preferably, a magnet is provided on one of the sensor substrate and the lens assembly, and a coil is provided on the other of the sensor substrate and the lens assembly. The lens assembly or the sensor substrate is driven to a direction orthogonal to the optical axis direction of the lens body by the magnet and the coil.

[0012] In order to reduce the height of the optical component driving device in the optical axis direction, the first sliding body is in the shape of a square frame, and a first receiving portion is formed by cutting inwardly at its side portion and a first corner portion is provided at its corner, and the first receiving portion can accommodate one of the magnet or the coil. Furthermore, the third sliding body is in the shape of a square frame, and a third receiving portion is formed by cutting inwardly at its side portion and a third corner portion is provided at its corner, and the other of the magnet or the coil can be accommodated in the third receiving portion. Furthermore, the second sliding body is in the shape of a square frame, and a second receiving portion is formed by cutting inwardly at its side portion and a second corner portion is provided at its corner, and the second receiving portion can accommodate at least one of the coils or a part of the magnet.

[0013] Furthermore, in order to ensure driving stability, the first convex portion, the first concave portion, the second convex portion, and the second concave portion may also be arranged on the first corner portion, the second corner portion, or the third corner portion.

[0014] The distance of the second receiving portion is preferably greater than the sliding distance of the second sliding body, and the second receiving portion has an end surface away from the coil or the magnet received in the second receiving portion to ensure the sliding width of the second sliding body.

[0015] Furthermore, a magnetic body may be provided on the other of the sensor substrate and the lens assembly so as to face the magnet via the coil, thereby restricting movement of the lens body between the sensor substrate and the lens assembly in the optical axis direction.

[0016] Another aspect of the present invention is a camera device having a lens driving device, and still another aspect is an electronic device having the camera device.

[0017] [Effects of the invention]

[0018] According to the present invention, a first sliding body, a second sliding body and a third sliding body are provided, a first convex portion extending in a first direction is formed on one of the first sliding body and the second sliding body, a first concave portion embedded in the first convex portion is formed on the other of the first sliding body and the second sliding body, a second convex portion extending in a second direction is formed on one of the second sliding body and the third sliding body, and a second concave portion embedded in the second convex portion is formed on the other of the second sliding body and the third sliding body, thereby reducing the jitter of the sensor substrate relative to the lens assembly and enabling precise position control.

Brief Description of the Drawings

[0019]

Figure 1

[0020]

Figure 2

[0021]

Figure 3

[0022]

Figure 4

[0023]

Figure 5

[0024]

Figure 6

[0025]

Figure 7

[0026]

Figure 8

[0027]

Fig. 9

[0028]

Explanation of symbols

[0029] 10. Camera Device

[0030] 12 Lens Components

[0031] 14Sensor drive components

[0032] 16 Lens

[0033] 18 frame

[0034] 20, 22 opening

[0035] 24 first sliding body

[0036] 26 second sliding body

[0037] 28 Third sliding body

[0038] 30 sensor driver components

[0039] 32 First light passage hole

[0040] 34 Containment Unit 1

[0041] 36 First corner

[0042] 38 coils

[0043] 40 Image Sensor

[0044] 42X Direction Position Detector

[0045] 44Y direction position detector

[0046] 46 first positioning protrusion

[0047] 48 first positioning hole

[0048] 50 first convex part

[0049] 52 Second corner

[0050] 54 first recess

[0051] 56 Second light passage hole

[0052] 58 Second Containment Unit

[0053] 60 magnets

[0054] 62 second convex part

[0055] 64 Third corner

[0056] 66 second recess

[0057] 68Third light through hole

[0058] 70 Containment Unit 3

[0059] 72 Magnetic body

[0060] 74 second positioning protrusion

[0061] 76 Second positioning hole

[0062] 78 Block

[0063] 80 stopper support [Specific implementation method]

[0064] Embodiments of the present invention will be described below with reference to the drawings.

[0065] Figures 1 to 5 A camera device 10 according to an embodiment of the present invention is shown. Figures 6 to 9 A sensor driving unit 14 is shown as an optical component driving device used in the camera device 10 according to the embodiment of the present invention.

[0066] like Figures 1 to 5 As shown, the camera device 10 includes a lens assembly 12 and a sensor drive assembly 14. The lens body 16 of the lens assembly 12 is disposed in a frame 18. The lens assembly 12 is fixed to a camera body (not shown). The frame 18 is quadrangular when viewed from the optical axis direction of the lens body 16. In the center of the frame 18, openings 20 and 22 are formed at the upper and lower parts of the lens body 16, which are circular when viewed from the optical axis direction of the lens body 16. The openings 20 and 22 are formed to allow light to pass through the lens body 16 or to install and remove the lens body 16 in the frame 18.

[0067] The lens body 16 may also be fixed on the frame 18. In this embodiment, the lens assembly 12 is supported so that the lens body 16 can move freely in the optical axis direction of the lens body 16 relative to the frame 18, and it has a driving mechanism for driving the lens body 16. That is, the lens assembly 12 has a well-known focusing function, and is supported by the frame 18 through a lens support body such as a spring that supports the lens body 16. A magnet is set on any one of the lens support body and the frame 18, and a coil is set on the other. By energizing the coil, the lens support body moves in the optical axis direction of the lens body 16.

[0068] In this specification, for convenience, the optical axis direction of the lens body 16 is referred to as the Z direction, the direction perpendicular to the optical axis direction is referred to as the X direction, and the direction perpendicular to the Z direction and the X direction is referred to as the Y direction. Furthermore, the subject side of the optical axis is referred to as the top, and the opposite side (i.e., the side where the image sensor described later is arranged) is referred to as the bottom.

[0069] The sensor driving unit 14 includes a first slider 24 , a second slider 26 , and a third slider 28 in a rectangular frame shape, which are substantially the same size as the lens unit 12 when viewed from the Z direction, and a rectangular plate-shaped sensor substrate 30 .

[0070] The first sliding body 24 is fixed to the sensor substrate 30. The first sliding body 24 has a first light passing hole 32 in a substantially quadrangular shape at the center. A first receiving portion 34 is formed on each of the four sides of the first sliding body 24. The first receiving portion 34 has four first corners 36 remaining, and a quadrangular groove is formed by cutting inward in the XY direction. The first receiving portion 34 receives a coil 38.

[0071] The sensor substrate 30 has an image sensor 40, for example, in a square shape, fixed at the center of the upper surface of the sensor substrate 30. Furthermore, a coil 38 is fixed around the image sensor 40 near the four sides of the sensor substrate 30. The coil 38 is composed of two straight line portions extending in the X or Y direction and a semicircular connecting portion connecting the two straight line portions. The length of the first housing portion 34 from the top to the inner end is substantially equal to the entire width of the straight line portion of the coil 38, and the length to both side ends is equal to or slightly larger than the entire width of the semicircular connecting portion of the coil 38. Furthermore. The thickness of the coil 38 in the Z direction is substantially equal to the thickness of the first sliding body 24 in the Z direction.

[0072] Moreover, if Figure 2 , Figure 7 , Figure 8 As shown, an X-direction position detector 42 for detecting the X-direction position of the sensor substrate 30 is provided in one coil 38 arranged in the X direction, and a Y-direction position detector 44 for detecting the Y-direction position of the sensor substrate 30 is provided in one coil 38 arranged in the Y direction.

[0073] Furthermore, first position positioning protrusions 46, 46 are formed on the lower sides of the two first corner portions 36, 36 at the diagonal positions of the first sliding body 24, and protrude downward (see Figure 3 On the other hand, first position positioning holes 48, 48 are formed on the sensor substrate 30 corresponding to the first position positioning protrusions 46, 46 (see Figure 3 The first position positioning protrusions 46 , 46 are inserted into the first position positioning holes 48 , 48 , and the first slider 24 is positioned and fixed by the sensor substrate 30 .

[0074] The second sliding body 26 holds the first sliding body 24 to be able to slide in the Y direction. That is, first convex portions 50 extending in the Y direction are formed below the four second corner portions 52 of the second sliding body 26 (see Figure 3 ), first recessed portions 54 extending in the Y direction are formed on the four first corner portions 36 of the first sliding body 24 (see Figure 2 ), the first convex portion 50 is embedded in the first concave portion 54 and is movable only in the Y direction. The lengths of the first convex portion 50 and the first concave portion 54 in the X direction are substantially equal, and the length of the first convex portion 50 in the Y direction is slightly shorter than the length of the first concave portion 54 in the Y direction, and the second sliding body 26 is allowed to move only in the Y direction relative to the first sliding body 24.

[0075] A second light-passing hole 56 having a generally square shape is formed in the center of the second sliding body 26 corresponding to the first light-passing hole 32. Second receiving portions 58 are formed on the four sides of the second sliding body 26, respectively. The second receiving portion 58 has four second corner portions 52 remaining, and a cut is made inward in the XY direction to form a square groove. The second receiving portion 58 accommodates about half of the lower side of the magnet 60 described later. Moreover, the distance between the end face of each second receiving portion 58 and the magnet 60 is greater than the sliding distance of the second sliding body 26.

[0076] The third sliding body 28 holds the second sliding body 26 slidable in the X direction. That is, second convex portions 62 extending in the X direction are formed on the four second corner portions 52 of the second sliding body 26 (see FIG. Figure 2 ), a second recess 66 extending in the X direction is formed below each of the four third corners 64 of the third sliding body 28 (see Figure 3 ), the second convex portion 62 is embedded in the second concave portion 66 and can move only in the X direction. The lengths of the second convex portion 62 and the second concave portion 66 in the Y direction are substantially equal, and the length of the second convex portion 62 in the X direction is slightly shorter than the length of the second concave portion 66 in the X direction. The second sliding body 26 is allowed to move only in the X direction relative to the third sliding body 28 (refer to Fig. 9 ).

[0077] A third light passage hole 68 having a substantially square shape is formed in the center of the third sliding body 28, corresponding to the first light passage hole 32 and the second light passage hole 56. A third receiving portion 70 is formed on each of the four sides of the third sliding body 28. The third receiving portion 70 has four third corner portions 64 remaining, and a cutout is made toward the inside in the XY direction to form a square groove. The lower half of the magnet 60 is fixed to the third receiving portion 70.

[0078] The magnet 60 is fixed to the bottom of the lens assembly 12 and the inner side of the third receiving portion 70 of the third sliding body 28. The magnet 60 is magnetized on the surface facing the coil 38, for example, the inner half is magnetized to N level and the outer half is magnetized to S level. The inner N level faces the straight line portion inside the coil 38, and the outer S level faces the straight line portion outside the coil 38. In addition, the X-direction position detector 42 and the Y-direction position detector 44 are composed of, for example, Hall elements and are arranged in the coil 38. If it moves relative to the magnet 60, the magnetic flux density changes, and the position relative to the magnet 60, that is, the position of the image sensor 40, is detected.

[0079] The magnetic body 72 is fixed to the lower side of the sensor substrate 30 and faces the magnet 60 via the coil 38. The magnet 60 and the magnetic body 72 attract each other by magnetic force, and the third slider 28 is attracted to the sensor substrate 30 in the Z direction.

[0080] Furthermore, second position positioning protrusions 74, 74 are formed on the upper surfaces of the two third corner portions 64, 64 at the diagonal positions of the third sliding body 28, and protrude upward (see Figure 2 On the other hand, second position positioning holes 76, 76 are formed on the bottom surface of the frame 18 of the lens assembly 12 corresponding to the second position positioning protrusions 74, 74 (see Figure 3 The second position positioning protrusions 74 , 74 are inserted into the second position positioning holes 76 , 76 , and the third sliding body 28 is positioned and fixed by the frame body 18 of the lens assembly 12 .

[0081] Furthermore, cylindrical stoppers 78 are formed to protrude downwardly at the four third corners 64 of the third slider 28. On the other hand, four corner portions of the first slider 24, the second slider 26, and the sensor substrate 30 are cut at 45 degrees to form stopper support portions 80. If the sensor substrate 30 moves in the XY directions relative to the lens assembly 12, the stoppers 78 come into contact with the stopper support portions 80, restricting its further movement.

[0082] In the above structure, if the coils 38, 38 facing the magnets 60, 60 on two surfaces in the X direction where magnetic flux in the Z direction exists are energized, current in the Y direction flows through the coils 38, 38, and according to Fleming's left-hand rule, the coils 38, 38 generate Lorentz forces in the X direction. The sensor substrate 30 can slide relative to the lens assembly 12 in the X direction via the second convex portion 62 and the second concave portion 66, and thus moves in the X direction due to the Lorentz forces generated by the coils 38, 38. The position of the sensor substrate 30 moved in the X direction is detected by the X direction position detector 42.

[0083] Furthermore, when the coils 38, 38 facing the magnets 60, 60 on two Y-direction surfaces where magnetic flux in the Z-direction exists are energized, current in the X-direction flows through the coils 38, 38, and according to Fleming's left-hand rule, the coils 38, 38 generate Lorentz forces in the Y-direction. The sensor substrate 30 can slide relative to the lens assembly 12 in the Y-direction via the first convex portion 50 and the first concave portion 54, and thus moves in the Y-direction due to the Lorentz forces generated by the coils 38, 38. The position of the sensor substrate 30 moved in the Y-direction is detected by the Y-direction position detector 44.

[0084] Thus, the image sensor 40 can be moved in the XY direction, thereby achieving shake compensation. In this case, the sensor substrate 30 is limited in movement by the first convex portion 50 and the first concave portion 54 extending in the XY direction, and the second convex portion 62 and the second concave portion 66, thereby suppressing rotation around the Z axis. For this reason, the shake of the sensor substrate 30 relative to the lens assembly 12 can be reduced, and accurate position control can be achieved.

[0085] Furthermore, in the above-mentioned embodiment, the lens assembly 12 is fixed so that the sensor substrate 30 moves in the XY direction, but the sensor substrate 30 may be fixed in reverse so that the lens assembly 12 moves in the XY direction. Furthermore, the first convex portion 50 and the first concave portion 54, and the second convex portion 62 and the second concave portion 66 may be replaced with each other. Furthermore, the extending directions of the first convex portion 50 and the first concave portion 54, and the extending directions of the second convex portion 62 and the second concave portion 66 may be replaced. Furthermore, the positions of the magnet 60 and the coil 38 (including the magnetic body 72) may be replaced.

[0086] Furthermore, the second receiving portion 58 can simultaneously receive the coil 38 and the magnet 60. Alternatively, the coil 38 can be received alone. In this case, the distance between the end surface of the second receiving portion 58 and the magnet 60 or the coil 38, whichever is smaller, is greater than the sliding distance of the second sliding body 26. Furthermore, when the second receiving portion 58 does not receive the coil 38 and the magnet 60, the second receiving portion 58 does not need to be provided.

Claims

1. An optical component driving device, characterized in that: It includes A lens assembly is provided with a lens body, a sensor substrate for fixing an image sensor for detecting light input through the lens body of the lens assembly, a first sliding body fixed on the sensor substrate, a second sliding body which holds the first sliding body slidable in a first direction orthogonal to the optical axis direction of the lens body; a third sliding body fixed to the lens assembly and configured to keep the second sliding body slidable in the optical axis direction of the lens body and in a second direction orthogonal to the first direction, A first convex portion extending in the first direction is formed on one of the first sliding body and the second sliding body, and a first concave portion embedded in the first convex portion is formed on the other of the first sliding body and the second sliding body. A second convex portion extending in the second direction is formed on one of the second sliding body and the third sliding body, and a second concave portion embedded in the second convex portion is formed on the other of the second sliding body and the third sliding body; A magnet is arranged on one of the sensor substrate and the lens assembly, and a coil is arranged on the other of the sensor substrate and the lens assembly; The first sliding body is in the shape of a square frame, a first receiving portion is formed by cutting inwardly at its side, and a first corner portion is provided at its corner, and the first receiving portion receives the magnet or the coil; the first sliding body has a first light passing hole formed in the center in an almost square shape; The second sliding body is in the shape of a quadrangular frame, and a second receiving portion is formed by cutting inwardly at its side portion and a second corner portion is provided at its corner portion, and the second receiving portion receives at least one of the coils or a part of the magnet; the center of the second sliding body corresponds to the first light passing hole, forming a second light passing hole in a substantially quadrangular shape; The third sliding body is in the shape of a square frame, and a third receiving portion is formed by cutting inwardly at its side and a third corner portion is provided at its corner, and the other of the magnet or the coil is received in the third receiving portion; the center of the third sliding body corresponds to the first light passing hole and the second light passing hole, forming a third light passing hole in a substantially square shape; The first sliding body, the second sliding body, and the third sliding body are sequentially disposed between the sensor substrate and the lens assembly.

2. The optical component driving device according to claim 1, characterized in that: One of the first convex portion or the first concave portion is arranged on the first corner portion; and the other of the first convex portion or the first concave portion is arranged on the second corner portion.

3. The optical component driving device according to claim 1, characterized in that: One of the second convex portion or the second concave portion is arranged on the third corner portion; and the other of the second convex portion or the second concave portion is arranged on the second corner portion.

4. The optical component driving device according to claim 1, characterized in that: The second housing portion has a distance greater than a sliding distance of the second sliding body and has an end surface away from the coil or the magnet housed in the second housing portion.

5. The optical component driving device according to claim 1, characterized in that: A magnetic body is provided on the other of the sensor substrate and the lens assembly via the coil, and faces the magnet.

6. A photographic device, characterized in that: An optical component driving device according to any one of claims 1 to 5.

7. An electronic device, characterized in that: A photographic device according to claim 6.

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