Driving device, camera device and electronic equipment

Abstract

Provided are a lens drive device, a photographic device, and an electronic device capable of ensuring smooth movement of a lens support. The lens drive device comprises a lens support, a frame, and a guide mechanism for guiding the lens support to freely move relative to a predetermined component constituting the frame in a direction perpendicular to the optical axis of the lens. The guide mechanism comprises, on one side and on the other side in a direction perpendicular to the movement direction of the lens support, guide protrusions extending along the movement direction of the lens support and protruding in the optical axis direction, and guide grooves recessed in the optical axis direction to allow the guide protrusions to fit. When viewed in the direction in which the guide protrusions and the guide grooves extend, the guide protrusions and the guide grooves make line contact at two locations on the one side in a direction perpendicular to the movement direction of the lens support, and make surface contact on the other side.

Description

Technical field

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

[0002] Electronic devices such as mobile phones and smartphones are equipped with small camera devices.

[0003] It is well known that such a small camera has a shake compensation function, for example, as described in US Patent Application Publication No. 2015 / 049209. [Summary of the invention]

[0004] [Technical Problems to be Solved by the Present Invention]

[0005] The camera module disclosed in Patent Document 1 comprises a lens support body that supports a lens, and a frame surrounding the lens support body. Multiple balls are used to support the lens support body so that it can move freely relative to the frame body in a direction perpendicular to the optical axis of the lens. Furthermore, the camera module includes a magnet and a magnetic component positioned opposite the magnet. The attractive force between the magnet and the magnetic component sandwiches the balls between the lens support body and the frame.

[0006] However, there is a problem with the above arrangement. If a force not less than the attractive force is generated between the magnet and the magnetic component due to falling or other reasons, the lens support body will leave the ball, and then the lens support body will contact the ball again. As a result, the lens support body and the frame, which are in point contact with the ball, will be impacted, causing the part in contact with the ball to become concave and cracked, which may cause the lens support body to be unable to move smoothly.

[0007] The present invention aims to solve the above-mentioned problems that have always existed, and to provide a lens driving device, a photographing device and an electronic device that can ensure smooth movement of a lens support body.

[0008]

Technical solution

[0009] One aspect of the present invention is a lens driving device, which has a lens support body that supports the lens, a frame body that supports the lens support body, and a guide mechanism that guides the lens support body to move freely in a direction perpendicular to the optical axis direction of the lens relative to a specified component constituting the frame body. The guide mechanism has, on one side and the other side in a direction perpendicular to the moving direction of the lens support body, guide protrusions protruding toward the optical axis direction and extending along the moving direction of the lens support body, and guide grooves that are recessed toward the optical axis direction so that the guide protrusions can be embedded. When viewed from the direction in which the guide protrusions and the guide grooves extend, the guide protrusions and the guide grooves on one side are in line contact at two locations, and the guide protrusions and the guide grooves on the other side are in surface contact.

[0010] Preferably, the guide mechanism comprises a first guide mechanism arranged on one side of the optical axis direction and a second guide mechanism arranged on the other side of the optical axis direction, and at least one of the first guide mechanism or the second guide mechanism comprises the guide protrusion and the guide groove.

[0011] Moreover, preferably, the guide protrusion and the guide groove of the first guide mechanism extend in a first direction orthogonal to the optical axis direction, and when viewed from the first direction, the guide protrusion and the guide groove on one side of a second direction orthogonal to both the optical axis direction and the first direction make line contact at two locations, and the guide protrusion and the guide groove on the other side of the second direction make surface contact, and the guide protrusion and the guide groove of the second guide mechanism extend in the second direction, and when viewed from the second direction, the guide protrusion and the guide groove on one side of the first direction make line contact at two locations, and the guide protrusion and the guide groove on the other side of the first direction make surface contact.

[0012] Moreover, preferably, on the side where the guide protrusion and the guide groove are in line contact with each other, when viewed from the direction in which the guide protrusion and the guide groove extend, the shape of the guide groove changes so that its width becomes smaller as it approaches the bottom of the groove, and for the portion between the two positions of line contact and the bottom of the groove, a space is formed between the guide protrusion and the guide groove, and on the side where the guide protrusion and the guide groove are in surface contact with each other, when viewed from the direction in which the guide protrusion and the guide groove extend, the guide groove has a plane at its bottom that extends in a direction orthogonal to the direction in which the guide protrusion and the guide groove extend, and the guide protrusion has a plane that makes surface contact with the plane.

[0013] Moreover, preferably, on the lens support body, one side of the magnet and the magnetic component is arranged on the side where the guide protrusion is in linear contact with the guide groove, parallel to the extension direction of the guide protrusion and the guide groove, and the other side of the magnet and the magnetic component is arranged on the frame body, opposite to the one side of the magnet and the magnetic component.

[0014] Furthermore, preferably, the frame body moves in the optical axis direction together with the lens support body.

[0015] Furthermore, preferably, one surface of the lens support body on which the guide groove is formed has a dummy recess formed near the guide groove.

[0016] Moreover, preferably, the bottom height of the dummy recess is equal to the bottom height of the guide groove.

[0017] Furthermore, preferably, the lens support body is provided with a material injection port trace at a position not overlapping with the guide groove in the optical axis direction, and the trace is located on a surface opposite to a surface where the guide groove and the dummy recess are formed.

[0018] Furthermore, preferably, the lens support body is provided with a material injection port trace at a position overlapping with the dummy recess in the optical axis direction, and the trace is located on a surface opposite to a surface where the guide groove and the dummy recess are formed.

[0019] Another aspect of the present invention is a photographic apparatus including the lens driving device and a lens supported by the lens support body.

[0020] Another aspect of the present invention is an electronic device including the camera device.

[0021] Effects of the invention

[0022] According to the present invention, the guide protrusion and the guide groove extend along the moving direction of the lens support body on one side and the other side in a direction perpendicular to the optical axis direction of the lens, respectively. The guide protrusion and the guide groove on one side make line contact at two locations, and the guide protrusion and the guide groove on the other side make surface contact. Therefore, the lens driving device of the present invention can reduce the impact received in the direction of the optical axis, and accurately position the guide protrusion and the guide groove, thereby ensuring that the lens support body moves along the field.

Brief Description of the Drawings

[0023] Figure 1 This is an exploded perspective view of the camera device 10 according to the embodiment of the present invention, which is disassembled and viewed from obliquely above.

[0024] Figure 2 To constitute Figure 1 1 is an exploded perspective view of the movable body 18 of the photographic device 10 when it is exploded and viewed from obliquely above.

[0025] Figure 3 To observe from below Figure 2 An exploded perspective view of the moving body 18.

[0026] Figure 4 This is an exploded perspective view of a portion of the fixed body 16 used in the camera device 10 according to the embodiment of the present invention, as seen from obliquely above.

[0027] Figure 5 for Figure 4 An oblique view of the flexible printed substrate 78 mounted on the fixed body 16.

[0028] Figure 6 To observe from above Figure 2 A plan view of the moving body 18.

[0029] Figure 7A for Figure 6 VIIA-VIIA line cross-section diagram, Figure 7B for Figure 6 Cross-sectional view along line VIIB-VIIB.

[0030] Figure 8A for Figure 7A An enlarged cross-sectional view of part VIIIA of Figure 8B for Figure 7A An enlarged cross-sectional view of portion VIIIB of FIG.

[0031] Figure 9A for Figure 7B Enlarged cross-sectional view of the IXA section, Figure 9B for Figure 7B An enlarged cross-sectional view of section IXB.

[0032] Figure 10 This is an enlarged plan view of the optical axis direction guide mechanism 102 according to this embodiment as viewed from above.

[0033] Figure 11 It is a perspective view of the lens support body according to the present embodiment as viewed obliquely from below.

[0034] Figure 12 This is a plan view of the lens support body according to this embodiment as viewed from above.

[0035] Figure 13A In this embodiment, Figure 12 A cross-sectional view of the lens support molding mold taken along line XIIA shows the resin injection state.

[0036] Figure 13B In this embodiment, Figure 12 A cross-sectional view of the lens support molding mold taken along line XIIB shows the resin injection state.

[0037] Figure 14A In other embodiments, Figure 12 A cross-sectional view of the lens support molding mold taken along line XIIA shows the resin injection state.

[0038] Figure 14B In this embodiment, Figure 12 A cross-sectional view of the lens support molding mold taken along line XIIB shows the resin injection state.

[0039]

Explanation of symbols

[0040] 10. Camera

[0041] 12 Lens drive device

[0042] 14 Lens

[0043] 16 fixed body

[0044] 18 Mobile

[0045] 20 lens support

[0046] 22 First frame

[0047] 24 Lens mounting holes

[0048] 26 First moving plate

[0049] 28 Second moving plate

[0050] 30 First cover

[0051] 32, 34, 36 openings

[0052] 38 Orthogonal direction guide mechanism

[0053] 40 First guide mechanism

[0054] 42 Second guide mechanism

[0055] 44, 44A, 44B Lower guide protrusions

[0056] 46, 46A, 46B lower guide groove

[0057] 48, 48A, 48B Upper guide protrusions

[0058] 50, 50A, 50B upper guide groove

[0059] 52 First Magnet

[0060] 54 Second Magnet

[0061] 56 first magnetic component

[0062] 58 second magnetic component

[0063] 60 Installation Department

[0064] 62 mounting holes

[0065] 64 Installed part

[0066] 66 The Third Magnet

[0067] 68 Second frame

[0068] 70 third magnetic component

[0069] 72 First coil

[0070] 74 Second coil

[0071] 76 Third coil

[0072] 78 Flexible Printing Substrate

[0073] 80 abutment

[0074] 82 Second cover

[0075] 84, 86 through holes

[0076] 88 opening

[0077] 90 terminal part

[0078] 92 Y direction position detection element

[0079] 94 X-direction position detection element

[0080] 96 Z direction position detection element

[0081] 98 connection part

[0082] 100 Separator Opening

[0083] 102 Optical axis direction guide mechanism

[0084] 104 Third guide mechanism

[0085] 106 Fourth guide mechanism

[0086] 108 +X side guide shaft

[0087] 110 +X side guide hole

[0088] 110A guide surface

[0089] 110B Y side

[0090] 112 - X-side guide shaft

[0091] 114 - X-side guide groove

[0092] 114A protrusion

[0093] 116 Lower fixing portion

[0094] 118 upper fixing portion

[0095] 120 Insertion hole

[0096] 122 flat surface

[0097] 124 Dummy recess

[0098] 126A, 126B Material injection port traces

[0099] 128 Lens support molding mold

[0100] 130 guide groove forming portion

[0101] 132 dummy recess forming portion

[0102] 134A, 134B Material injection port [Specific implementation method]

[0103] The following embodiments illustrate the lens driving device, camera device, and electronic device of the present invention by way of example, but the present invention is not intended to be limited to the following embodiments.

[0104] Figure 1 A camera device 10 according to an embodiment of the present invention is shown. The camera device 10 is mounted on an electronic device such as a mobile phone or a smartphone, and includes a lens driving device 12 and a lens 14 mounted on the lens driving device 12 .

[0105] In the following description, for the sake of convenience, the optical axis direction of the lens 14 is referred to as the Z direction, a direction perpendicular to the Z direction is referred to as the X direction, and a direction perpendicular to both the Z direction and the X direction is referred to as the Y direction. Figure 1 The upper side in the figure is called the upper side, and the opposite side (i.e., the side where the image sensor is configured but not shown in the figure) is called the lower side.

[0106] The lens driving device 12 includes a fixed body 16 and a movable body 18 supported by the fixed body 16 and movable in the optical axis direction. The movable body 18 is disposed inside the fixed body 16 .

[0107] The moving body 18 is as follows Figure 2 、 Figure 3 As shown, there is a lens support body 20 that supports the lens 14 and a first frame body 22 that surrounds the lens support body 20. When viewed from above, the lens support body 20 and the first frame body 22 have a substantially square shape.

[0108] A circular lens mounting hole 24 is formed inside the lens support 20 and penetrates from the upper side to the lower side when viewed from the Z direction. The lens 14 is mounted in the lens mounting hole 24 .

[0109] The first frame body 22 includes a first movable body plate 26, a second movable body plate 28, and a first cover 30, each of which has a roughly square shape when viewed from above. 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), polyoxymethylene, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, etc. The first cover 30 is made of, for example, metal. Openings 32, 34, and 36 for allowing light to pass through are respectively formed in the first movable body plate 26, the second movable body plate 28, and the first cover 30, respectively, and extend from the upper side to the lower side. The openings 32, 34, and 36 are respectively roughly circular.

[0110] The first frame 22 supports the lens support 20 for free movement in both a first direction (i.e., the X direction) and a second direction (i.e., the Y direction). Specifically, a guide mechanism (i.e., an orthogonal guide mechanism 38) is provided on the lens support 20 and the first frame 22 to support free movement of the lens support 20 in both the X and Y directions relative to a predetermined component of the frame (i.e., the second movable plate 28). The orthogonal guide mechanism 38 is composed of a first guide mechanism 40 provided on one side (the lower side) in the Z direction and a second guide mechanism 42 provided on the other side (the upper side) in the Z direction.

[0111] The first guide mechanism 40 consists of a lower guide protrusion 44 projecting in the -Z direction from below the first movable plate 26, and a lower guide groove 46 recessed in the -Z direction to allow the lower guide protrusion 44 to fit over the second movable plate 28. The lower guide protrusion 44 and the lower guide groove 46 are formed near the four corners of the first movable plate 26 and the second movable plate 28, respectively, and extend in the X direction.

[0112] The lower guide protrusion 44 and lower guide groove 46 each extend in the X-direction, allowing relative movement only in the X-direction, while limiting movement in the Y-direction. Consequently, the first movable plate 26 can move only in the X-direction relative to the second movable plate 28, limiting movement in the Y-direction. In other words, the first guide mechanism 40 allows the lens support 20 to move in the X-direction relative to the second movable plate 28, along with the first movable plate 26.

[0113] Furthermore, the lower guide protrusions 44 and the lower guide grooves 46 are arranged on one side and the other side in a direction perpendicular to the moving direction of the first movable plate 26 (i.e., the Y direction). Specifically, the lower guide protrusions 44 include two lower guide protrusions 44A, 44A provided on one side in the Y direction (the -Y side) and two lower guide protrusions 44B, 44B provided on the other side in the Y direction (the +Y side). Furthermore, the lower guide grooves 46 include two lower guide grooves 46A, 46A provided on one side in the Y direction and two lower guide grooves 46B, 46B provided on the other side in the Y direction.

[0114] like Figure 7A 、 Figure 8B As shown, when viewed from the X-direction, the cross-section of the lower guide grooves 46A, 46A on one side in the Y-direction is V-shaped. The shape of the lower guide grooves 46A, 46A changes so that their width decreases as they approach the bottom of the groove. To achieve this, the guide grooves are inclined. Furthermore, the lower guide protrusions 44A, 44A are semicircular. As a result, the arcuate portions of the lower guide protrusions 44A, 44A and the straight portions of the lower guide grooves 46A, 46A make line contact at two locations. Furthermore, a space is formed between the lower guide protrusions 44A, 44A and the lower guide grooves 46A, 46A between the two points of line contact and the bottom of the groove. The cross-section of the lower guide protrusions 44A, 44A may also be square. In this case, the cross-section of the lower guide grooves 46A, 46A may also be V-shaped or U-shaped. By making line contact at two locations, the positions of the lower guide protrusions 44A, 44A relative to the lower guide grooves 46A, 46A in the Y direction can be determined without deviation.

[0115] Moreover, if Figure 7A 、 Figure 8AAs shown, when viewed from the X-direction, the cross-sections of the lower guide protrusions 44B, 44B and the lower guide grooves 46B, 46B on the other side of the Y-direction are each square. Specifically, the lower guide grooves 46B, 46B have a flat surface at their bottoms that extends in a direction perpendicular to the direction in which the lower guide protrusions 44B, 44B and the lower guide grooves 46B, 46B extend, and the lower guide protrusions 44B, 44B have a flat surface that makes surface contact with this flat surface. Thus, the lower guide protrusions 44B, 44B and the lower guide grooves 46B, 46B are in surface contact with each other on the other side of the Y-direction. This allows the height of the first movable plate 26 relative to the second movable plate 28 in the Z-direction to be determined. Furthermore, the flat surface of the lower guide grooves 46B, 46B is larger than that of the lower guide protrusions 44B, 44B. Therefore, even if the distance between the lower guide protrusions 44A, 44A and the lower guide protrusions 44B, 44B is different from the distance between the lower guide grooves 46A, 46A and the lower guide grooves 46B, 46B due to manufacturing errors, assembly can be performed, thereby allowing the first movable body plate 26 to move smoothly.

[0116] The second guide mechanism 42 comprises an upper guide protrusion 48 projecting in the +Z direction from the upper portion of the first movable plate 26, and an upper guide groove 50 recessed in the +Z direction to allow the upper guide protrusion 48 to fit under the lens support 20. The upper guide protrusion 48 and the upper guide groove 50 are formed near the four corners of the first movable plate 26 and the lens support 20, respectively, and extend in the Y direction.

[0117] The upper guide protrusion 48 and the upper guide groove 50 each extend in the Y direction, allowing relative movement only in the Y direction, limiting movement in the X direction. Consequently, the lens support 20 can move only in the Y direction relative to the first movable plate 26, limiting movement in the X direction. In other words, due to the second guide mechanism 42, the lens support 20 can move in the Y direction relative to the first movable plate 26. Combined with the first guide mechanism 40, the lens support 20 can move in both the X and Y directions relative to the second movable plate 28. Furthermore, the first guide mechanism 40 and the second guide mechanism 42 are independent guide mechanisms. Even when the X and Y directions are driven simultaneously, no rotational force is generated in the Z direction, thereby preventing rotational vibration of the lens support 20.

[0118] Furthermore, the upper guide protrusion 48 and the upper guide groove 50 are arranged on one side and the other side in a direction perpendicular to the movement direction of the lens support 20 (i.e., the X direction). Specifically, the upper guide protrusion 48 includes two upper guide protrusions 48A, 48A provided on one side (-X side) in the X direction, and two upper guide protrusions 48B, 48B provided on the other side (+X side) in the X direction. Furthermore, the upper guide groove 50 includes two upper guide grooves 50A, 50A provided on one side in the X direction, and two upper guide grooves 50B, 50B provided on the other side in the X direction.

[0119] like Figure 7B 、 Figure 9A As shown, when viewed from the Y direction, the cross-section of the upper guide grooves 50A, 50A on one side in the X direction is V-shaped. The shape of the upper guide grooves 50A, 50A changes so that their width decreases as they approach the bottom of the groove. To achieve this, the guide grooves are inclined. Furthermore, the upper guide protrusions 48A, 48A are semicircular in shape. As a result, the arcuate portions of the upper guide protrusions 48A, 48A and the straight portions of the upper guide grooves 50A, 50A make line contact at two locations. Furthermore, a space is formed between the upper guide protrusions 48A, 48A and the upper guide grooves 50A, 50A between the two line contact locations and the bottom of the groove. The cross-section of the upper guide protrusions 48A, 48A may also be square. In this case, the cross-section of the upper guide grooves 50A, 50A may also be V-shaped or U-shaped. By making line contact at two locations, the positions of the upper guide grooves 50A, 50A relative to the upper guide protrusions 48A, 48A in the X direction can be determined without deviation.

[0120] Moreover, if Figure 7B 、 Figure 9B As shown, when viewed from the Y direction, the cross-sections of the upper guide protrusions 48B, 48B and the upper guide grooves 50B, 50B on the other side of the X direction are each square. Specifically, the upper guide grooves 50B, 50B have a flat surface at their bottoms extending in a direction perpendicular to the direction in which the upper guide protrusions 48B, 48B and the upper guide grooves 50B, 50B extend, and the upper guide protrusions 48B, 48B have a flat surface that makes surface contact with this flat surface. Thus, the upper guide protrusions 48B, 48B and the upper guide grooves 50B, 50B are in surface contact with each other on the other side of the X direction. This allows the height of the lens support 20 relative to the first movable plate 26 in the Z direction to be determined. Furthermore, the flat surface of the upper guide grooves 50B, 50B is larger than that of the upper guide protrusions 48B, 48B. Therefore, even if the distance between the upper guide protrusions 48A and 48B is different from the distance between the upper guide grooves 50A and 50B due to manufacturing errors, assembly is possible and the lens support 20 can be moved smoothly.

[0121] A first plate-shaped magnet 52 and a second plate-shaped magnet 54 are fixed to the outside of the lens support body 20. The first magnet 52 faces the Y direction and is arranged on one side of the Y direction, that is, the side where the lower guide protrusions 44A, 44A and the lower guide grooves 46A, 46A are in line contact. The second magnet 54 faces the X direction and is arranged on one side of the X direction, that is, the side where the upper guide protrusions 48A, 48A and the upper guide grooves 50A, 50A are in line contact. The first magnet 52 sets the S pole on the plate surface on the side facing the Y direction and the N pole on the plate surface on the other side. The second magnet 54 sets the S pole on the plate surface on the side facing the X direction and the N pole on the plate surface on the other side.

[0122] A first magnetic component 56 and a second magnetic component 58, each composed of a magnetic material, are disposed below the second movable plate 28. The first magnetic component 56 is disposed along the X direction and on one side in the Y direction, parallel to the first magnet 52. The second magnetic component 58 is disposed along the Y direction and on one side in the X direction, parallel to the second magnet 54. Thus, the first magnetic component 56 and the first magnet 52 face each other in the Z direction across the second movable plate 28, and similarly, the second magnetic component 58 and the second magnet 54 face each other in the Z direction across the second movable plate 28.

[0123] On one side in the Y direction, the first magnet 52 and the first magnetic member 56 are positioned between the combination of the lower guide protrusion 44A and the lower guide groove 46A on one side and the combination of the lower guide protrusion 44A and the lower guide groove 46A on the other side, thereby attracting each other. Therefore, compared to positioning the first magnet 52 and the first magnetic member 56 in other positions, the lower guide protrusions 44A, 44A and the lower guide grooves 46A, 46A, which are in line contact with each other, can achieve stronger contact, thereby enabling more accurate Y-direction positioning.

[0124] On one side in the X direction, the second magnet 54 and the second magnetic member 58 are positioned between the upper guide protrusion 48A and the upper guide groove 50A combination on one side and the upper guide protrusion 48A and the upper guide groove 50A combination on the other side, thereby attracting each other. Therefore, compared to positioning the second magnet 54 and the second magnetic member 58 in other positions, the upper guide grooves 50A, 50A and the upper guide protrusions 48A, 48A, which are in line contact with each other, can achieve stronger contact, thereby enabling more accurate X-direction positioning.

[0125] Mounting portions 60 are provided at the four corners of the first cover 30, extending downward in the Z direction. A mounting hole 62 is formed in each mounting portion 60. Furthermore, mounting portions 64 are formed at the four corners of the second movable plate 28, protruding laterally. The mounting holes 62 are inserted into the mounting portions 64, thereby securing the first cover 30 to the second movable plate 28. Furthermore, between the lower portion of the first cover 30 and the upper portion of the lens support 20, as shown in FIG. Figure 7A 、 Figure 7B As shown, a necessary minimum gap is formed including errors caused by tolerances, etc. Therefore, even when subjected to impact, the lens support 20 and the first and second movable plates 26 and 28 are regulated and do not have an excessive distance between them.

[0126] A plate-shaped third magnet 66 is fixed to the outer surface of the second movable plate 28 on the side opposite to the side where the first magnet 52 is located (i.e., the +Y side), with its plate surface facing the Y direction. This third magnet 66 is divided into two parts, an upper side and a lower side in the Z direction, with an S pole and a N pole provided on the plate surface. This arrangement results in opposite polarities at the top and bottom.

[0127] like Figure 1 As shown, the fixed body 16 includes a second frame body 68 having a base 80 and a second cover 82, a third magnetic component 70 mounted on the second frame body 68, a first coil 72, a second coil 74, a third coil 76, and a flexible printed substrate 78. The base 80 and the second cover are respectively made of resin or non-magnetic metal and have a square shape when viewed from above in the Z direction. The second cover 82 is embedded on the outer side of the base 80, thereby forming the second frame body 68. The second frame body 68 surrounds the first frame body 22 of the movable body 18. Through holes 84 and 86 are formed in the base 80 and the second cover 82 to allow light to pass through or be inserted into the lens 14.

[0128] Moreover, if Figure 1 、 Figure 4 As shown, openings 88 that open upward in the Z direction are formed on each of the four side surfaces of the base 80. Furthermore, the flexible printed substrate 78 is arranged so as to surround three side surfaces of the base 80. Specifically, the flexible printed substrate 78 is bent into a U-shape, surrounding two side surfaces perpendicular to the Y direction and one side surface perpendicular to the X direction (the -X side) of the base 80.

[0129] Inside the flexible printed substrate 78, the first coil 72 and third coil 76 are fixed on two surfaces perpendicular to the Y direction, and the second coil 74 is fixed on one surface perpendicular to the X direction. A terminal portion 90 is provided on the lower portion of the flexible printed substrate 78 in the Z direction, through which current is supplied, signals are output, etc.

[0130] Moreover, if Figure 5As shown, on the inner side of the flexible printed substrate 78, a Y-direction position detection element 92 is configured on the middle side of the first coil 72, an X-direction position detection element 94 is configured on the middle side of the second coil 74, and a Z-direction position detection element 96 is configured at a position adjacent to the third coil 76.

[0131] The first coil 72 and the Y-direction position detection element 92 are arranged within the opening 88, adjacent to the inner side of the base 80, and face the first magnet 52. Similarly, the second coil 74 and the X-direction position detection element 94 are arranged within the opening 88, facing the second magnet 54. Furthermore, the third coil 76 and the Z-direction position detection element 96 are arranged within the opening 88, facing the third magnet 66.

[0132] Moreover, if Figure 1 As shown, a third magnetic member 70 composed of a magnetic material is disposed outside the portion of the flexible printed substrate 78 where the third coil 76 is fixed, parallel to the third coil 76. The third magnetic member 70 is closely attached to and fixed to the side of the base 80 via the flexible printed substrate 78. The third magnetic member 70 and the third magnet 66 sandwich the flexible printed substrate 78 and the third coil 76 and face each other.

[0133] The magnetic flux from the third magnet 66 flows toward the third magnetic member 70, generating an attractive force between the third magnet 66 and the third magnetic member 70. As a result, an attractive force in the Y direction is generated on the movable body 18 relative to the fixed body 16.

[0134] Two separation openings 100, 100 are formed on the third magnetic component 70, which are divided into two parts in the X direction by a connecting portion 98 extending in the Z direction. The connecting portion 98 may also extend in the Y direction. In this case, the separation openings 100, 100 are divided into two parts in the Z direction. The third magnetic component is made of a magnetic stainless steel plate or iron that has been plated. By forming the separation openings 100, 100 on the third magnetic component 70, the attraction between it and the third magnet 66 can be adjusted to a desired strength. In other words, the driving force required for movement in the Z direction can be reduced, and at the same time, when an external impact is applied, the damage to the optical axis direction guide mechanism 102 described below can be reduced.

[0135] like Figure 1As shown, the movable body 18 is supported by the optical axis direction guide mechanism 102 and can move in the Z direction relative to the fixed body 16. In other words, the optical axis direction guide mechanism 102 guides the first frame body 22 to move freely in the Z axis direction relative to the second frame body 68. That is, thereby, the lens support body 20 is guided to move freely in the optical axis direction together with the first frame body 22. The optical axis direction guide mechanism 102 is composed of a third guide mechanism 104 and a fourth guide mechanism 106. The third guide mechanism 104 is composed of a +X side guide shaft 108 provided on the second frame body 68 and a +Z side guide hole 110 provided on the movable body 18 to accommodate the +X side guide shaft 108. The fourth guide mechanism 106 is composed of a -X side guide shaft 112 provided on the second frame body 68 and a -X side guide groove 114 provided on the movable body 18.

[0136] In this embodiment, the +X-side guide shaft 108 and the -X-side guide shaft 112 are cylindrical, extending in the Z direction, and are made of, for example, ceramic, metal, or resin. The +X-side guide shaft 108 and the -X-side guide shaft 112 are positioned near the inner corner of the side surface of the base 80 where the third coil 76 is positioned. Furthermore, the +X-side guide shaft 108 and the -X-side guide shaft 112 are circular in cross-section in the X-Y direction, but may be partially circular or elliptical. Alternatively, they may be polygonal, such as a square.

[0137] Near the corner of the side surface of the bottom portion around the through hole 84 of the base 80 where the third coil 76 is arranged, lower fixing portions 116, 116 forming cylindrical insertion grooves are provided. The lower ends of the +X side guide shaft 108 and the -X side guide shaft 112 are inserted and fixed to the lower fixing portions 116, 116. Moreover, the upper end of the third magnetic component 70 forms upper fixing portions 118, 118 bent in the Y direction at both ends in the X direction. An insertion hole 120 is formed in each upper fixing portion 118. The upper ends of the +X side guide shaft 108 and the -X side guide shaft 112 are inserted into and fixed to the insertion holes 120, 120. Thus, the +X side guide shaft 108 and the -X side guide shaft 112 are fixed to the base 80. The third magnetic component 70 is also responsible for supporting the +X side guide shaft 108 and the −X side guide shaft 112 . Compared with using other components for support, the number of components can be reduced, thereby stably supporting the +X side guide shaft 108 and the −X side guide shaft 112 .

[0138] like Figure 2 、 Figure 6 As shown, the +X side guide hole 110 is a hollow through hole that penetrates downward from the Z direction of the second movable body plate 28. Moreover, the -X side guide groove 114 extends downward from the Z direction of the second movable body plate 28 and forms a groove open to the outside in the -X direction.

[0139] like Figure 6 、 Figure 10 As shown, the cross-sectional shape of the +X side guide hole 110 in the X-Y plane is V-shaped on the -Y side and square on the +Y side. The cross-sectional shape of the +Y side can also be semicircular.

[0140] Due to the attractive force between the third magnet 66 and the third magnetic component 70 mounted on the movable body 18, the movable body 18 is pulled in the +Y direction. Consequently, at least on the -Y side of the +X-side guide hole 110, as viewed from the Z direction, the X-shaped guide surfaces 110A, 110A make line contact with the outer surface of the +X-side guide shaft 108 at two locations. This allows for accurate positioning of the movable body 18 relative to the fixed body 16 in the X and Y directions. Furthermore, while it is preferable that the square portion of the +X-side guide hole 110 not make line contact with the outer surface of the +X-side guide shaft 108, with a very small gap provided, line contact is possible.

[0141] Furthermore, the -X side guide groove 114 is composed of two wall surfaces facing each other in the Y direction on the cross section of the X_Y plane. Curved protrusions 114A, 114A protruding in the Y direction are formed on these two wall surfaces. Figure 10 As shown, at least the center of the -Y-side protrusion 114A contacts the outer surface of the -X-side guide shaft 112. That is, the -X-side guide groove 114 and the -X-side guide shaft 112 make contact at least at one point, thereby reducing frictional resistance. Furthermore, it is preferable that the +Y-side protrusion 114A not make point contact with the outer surface of the -X-side guide shaft 112, but rather provide a very small gap. However, line contact is also possible. As a result, the movable body 18 is pressed against the +X-side guide shaft 108 and the -X-side guide shaft 112 by the magnetic force, and thus does not tilt relative to the +X-side guide shaft 108 and the -X-side guide shaft 112. Furthermore, as the lens 14 increases in size, the weight of the movable body 18 carrying the lens 14 increases. In this case, the required attraction force due to the magnetic force must be increased, resulting in an increase in friction. However, the increased driving force must be less than the increase in lens weight. However, in this embodiment, since it is a guide shaft structure, there is no need to increase the necessary attraction force due to the magnetic force, and the driving force is also small, so the problem can be solved.

[0142] In the lens driving device 12, the first magnet 52 and the first coil 72 constitute a driving mechanism that moves the lens support body 20 in the Y-axis direction relative to the second movable body plate 28. If the first coil 72 is energized, the current in the X direction flows to the first coil 72. The first magnet 52, which is opposite to the first coil 72, generates a magnetic flux with a Z-direction component, thereby generating a Lorentz force in the Y direction on the first coil 72. The first coil 72 is fixed on the base 80, so the corresponding reaction force generated on the first magnet 52 becomes a driving force relative to the lens support body 20. The lens support body 20 is guided to move in the Y direction by the second guide mechanism 42.

[0143] If the first coil 72 is no longer energized after the lens support body 20 moves in the Y direction, the lens support body 20 stops at the position where the first coil 72 is no longer energized due to the attraction between the first magnet 52 and the first magnetic body 56, the attraction between the second magnet 54 and the second magnetic body 58, the friction between the lower guide protrusion 44 and the lower guide groove 46, and the friction between the upper guide protrusion 48 and the upper guide groove 50.

[0144] Furthermore, the second magnet 54 and the second coil 74 constitute a driving mechanism that causes the lens support 20 to move relative to the second movable plate 28 in the X-axis direction together with the first movable plate 26. When the second coil 74 is energized, a current in the Y-direction flows to the second coil 74. The second magnet 54, which is opposite to the second coil 74, generates a magnetic flux having a Z-direction component, thereby generating a Lorentz force in the X-direction on the second coil 74. The second coil 74 is fixed to the base 80, so the corresponding reaction force generated on the second magnet 54 becomes a driving force relative to the lens support 20 and the first movable plate 26, and the lens support 20 and the first movable plate 26 are guided by the first guide mechanism 40 to move in the X-direction.

[0145] If the second coil 74 is no longer energized after the lens support 20 and the first movable plate 26 move in the X direction, the lens support 20 and the first movable plate 26 stop at the position where the second coil 74 is no longer energized due to the attraction between the first magnet 52 and the first magnetic body 56, the attraction between the second magnet 54 and the second magnetic body 58, the friction between the lower guide protrusion 44 and the lower guide groove 46, and the friction between the upper guide protrusion 48 and the upper guide groove 50.

[0146] The third magnet 66, the third coil 76, and the third magnetic component 70 constitute a driving mechanism that moves the movable body 18 relative to the fixed body 16 in the optical axis direction. If the third coil 76 is energized, the current in the X direction flows to the third coil 76. The third magnet 66, which is opposite to the third coil 76, generates a magnetic flux in the Y direction, thereby generating a Lorentz force in the Z direction on the third coil 76. The third coil 76 is fixed to the base 80, so the corresponding reaction force generated on the third magnet 66 becomes a driving force relative to the movable body 18, and the movable body 18 is guided to move in the Z direction by the optical axis direction guide mechanism 102. That is, the lens support body 20 moves in the optical axis direction.

[0147] If the third coil 76 is no longer energized after the movable body 18 moves in the Z direction, the lens support body 20 included in the movable body 18 stops at the position where the third coil is no longer energized due to the attraction between the third magnet 66 and the third magnetic body 66, and the friction between the +X side guide shaft 108 and the +X side guide hole 110, the -X side guide shaft 112 and the -X side guide groove 114.

[0148] Here, let's assume that the camera device 10 is subjected to an impact in the Y direction. Even if the +X guide shaft 108 and +X guide hole 110, as well as the -X guide shaft 112 and -X guide groove 114, separate, they return to their original positions immediately after only a small separation, resulting in minimal damage. Lower guide protrusions 44A, 44B and lower guide grooves 46A, 46B, as well as upper guide protrusions 48A, 48B and upper guide grooves 50A, 50B, maintain contact, resulting in virtually no damage.

[0149] Here, it is assumed that the camera device 10 is subjected to an impact in the X direction. The +X-side guide shaft 108 and the +X-side guide hole 110, the -X-side guide shaft 112 and the -X-side guide groove 114, the lower guide protrusions 44A and 44B and the lower guide grooves 46A and 46B, and the upper guide protrusions 48A and 48B and the upper guide grooves 50A and 50B respectively maintain contact, and thus are hardly damaged.

[0150] Assume that the camera device 10 is subjected to an impact in the Z direction. The +X guide shaft 108 and the +X guide hole 110, as well as the -X guide shaft 112 and the -X guide groove 114, maintain contact, resulting in minimal damage. Even if the lower guide protrusions 44A, 44B and the lower guide grooves 46A, 46B, and the upper guide protrusions 48A, 48B and the upper guide grooves 50A, 50B separate, they return to their original positions immediately after only a small distance. Furthermore, the contact is linear or surface contact, resulting in minimal damage.

[0151] Therefore, no matter which direction the camera 10 is impacted, the lens driving device 12 of this embodiment is minimally damaged or almost not damaged, thereby ensuring smooth movement of the lens support 20 in the X, Y, and Z directions.

[0152] In the above embodiment, the first movable plate 26 is provided with the lower guide protrusion 44 and the upper guide protrusion 48, the second movable plate 28 is provided with the lower guide groove 46, and the lens support 20 is provided with the upper guide groove 50. However, the positions of the protrusions and grooves may be reversed, with the guide grooves formed above and below the first movable plate 26 and the guide protrusions formed on the second movable plate 28 and the lens support 20 facing each other. Furthermore, only the upper or lower sides may be reversed.

[0153] Moreover, in the above embodiment, an example is given of a case where the first coil 72, the second coil 74, the third coil 76 and the third magnetic body 70 are installed on the fixed body 12, and the first magnet 52, the second magnet 54, and the third magnet 66 are installed on the movable body 18, but the first coil 72, the second coil 74, the third coil 76 and the third magnetic body 70 can also be installed on the movable body 18, and the first magnet 52, the second magnet 54, and the third magnet 66 can be installed on the fixed body 12.

[0154] The lens support body 20 will be further described below.

[0155] like Figure 11 As shown, at the four corners of the lens support body 20, flat portions 122 are formed from the bottom of the main body to a certain upper portion. Upper guide grooves 50 are formed on the flat portions 122, and the upper guide grooves 50 are recessed upward from the flat portions 122.

[0156] Furthermore, a dummy recess 124 is formed near the upper guide groove 50 on the planar portion 122, recessed upward from the planar portion 122. In this case, if the dummy recess 124 is not formed, the thickness of the lens support body 20 remains relatively large, and the deformation of the periphery, including the upper guide groove 50, remains relatively large. However, if the dummy recess 124 is formed, the actual thickness of the lens support body 20 around the portion where the dummy recess 124 is formed is reduced. Therefore, the dummy recess 124 can reduce the actual thickness of the lens support body 20, thereby reducing the deformation of the upper guide groove 50 during the molding of the lens support body 20.

[0157] Furthermore, a dummy recess 124 is formed not only in the planar portion 122 but also in the main body of the lens support body 20. The bottom height of the dummy recess 124 is substantially equal to the bottom height of the upper guide groove 50. In other words, the distance from the planar portion 122 to the bottom of the upper guide groove 50 is substantially equal to the distance from the planar portion 122 to the bottom of the dummy recess 124. The same applies to the dummy recess 124 formed in the main body, where the bottom height of the dummy recess 124 is substantially equal to the bottom height of the upper guide groove 50.

[0158] As mentioned above, the lens support 20 is formed by resin molding. Figure 12 As shown, two material injection port marks 126A and 126B are formed at point-symmetrical positions on the lens support body 20. These material injection port marks 126A and 126B are formed at positions in the Z direction that do not overlap with the upper guide groove 50 but overlap with the dummy recess 124. Furthermore, these material injection port marks 126A and 126B are formed on the inner side of the dummy recess 124 in the Y direction. These material injection port marks 126A and 126B are recessed further than their surrounding areas.

[0159] Figure 13A 、 13B The lens support body 20 is molded. A lens support body molding mold 128 includes a guide groove forming portion 130 and a dummy recess forming portion 132. The guide groove forming portion 130 and the dummy recess forming portion 132 are equal in height, so that the bottom heights of the upper guide groove 50 and the dummy recess 124 are equal, and this "equal" includes the meaning of being substantially equal.

[0160] Furthermore, material injection ports 134A and 134B are formed in the lens support molding die 128. These material injection ports 134A and 134B face the dummy recess forming portion 132. A material injection port mark 126A corresponds to the material injection port 134A, and a material injection port mark 126B corresponds to the material injection port 134B.

[0161] In order to shape the lens support body 20, as shown in FIG. Figure 13A 、 13BAs shown, if resin is injected into the lens support molding mold 128 from material injection ports 134A and 134B, the resin is expected to flow as indicated by the arrows. The closer the direction of the arrow on the guide groove forming portion 130 is to the direction of the upper surface of the guide groove forming portion 130, the smoother the resin flow, indicating that the sliding surface of the upper guide groove 50 is less likely to have unevenness. In this case, as previously described, the heights of the guide groove forming portion 130 and the dummy recess forming portion 132 are approximately equal. Therefore, the dummy recess forming portion 132 rarely interferes with the flow of resin, and the resin flows smoothly inward around the guide groove forming portion 130. This prevents the sliding surface of the upper guide groove 50 from forming wavy unevenness, thereby ensuring stable and smooth movement of the lens support 20.

[0162] On the other hand, if the bottom height of the dummy recess 124 is made much higher than the bottom height of the upper guide groove 50, Figure 14A 、 14B In the other embodiment shown, resin injected into the lens support molding die 128 from the material injection ports 134A and 134B immediately contacts the dummy recess forming portion 132, thereby preventing smooth flow of the resin toward the surrounding area. Therefore, a wave pattern is formed inwardly around the guide groove forming portion 130, and after molding, a wave-like concave and convex pattern is formed on the sliding surface of the upper guide groove 50.

[0163] In other embodiments, since the bottom height of the dummy recess 124 is much higher than the bottom height of the upper guide groove 50, a corrugated concave-convex shape is formed on the sliding surface of the upper guide groove 50. On the other hand, the deformation of the upper guide groove 50 can be reduced. As long as the concave-convex shape of the sliding surface of the upper guide groove 50 is within the allowable range, the bottom of the dummy recess 124 can also be raised. Figure 13A 、 13B 、 Figure 14A 、 14B In the embodiment, two material injection ports 134A and 134B are provided, but one or more than three material injection ports may be provided.

[0164] Furthermore, in the above embodiment, the lens driving device 12 used in the photographic device 10 has been described, but the present invention can also be applied to other devices.

Claims

1. A lens driving device, comprising a lens support body for supporting the lens, a frame body supporting the lens support body, a guide mechanism for guiding the lens support body to freely move in a direction perpendicular to the optical axis direction of the lens relative to a predetermined member constituting the frame body; Its characteristics are: The guide mechanism includes, on one side and the other side in a direction perpendicular to the moving direction of the lens support, a guide protrusion extending along the moving direction of the lens support and protruding toward the optical axis, and a guide groove recessed toward the optical axis for the guide protrusion to fit into. When viewed from the direction in which the guide protrusion and the guide groove extend, the guide protrusion and the guide groove on one side make line contact at two locations, and the guide protrusion and the guide groove on the other side make surface contact. On the side where the guide protrusion and the guide groove are in line contact with each other, when viewed from the direction in which the guide protrusion and the guide groove extend, the shape of the guide groove changes so that its width decreases as it approaches the bottom of the groove, and a space is formed between the guide protrusion and the guide groove in the portion between the two positions of line contact and the bottom of the groove. On the side where the guide protrusion and the guide groove are in surface contact with each other, when viewed from the direction in which the guide protrusion and the guide groove extend, the guide groove has a plane at its bottom extending in a direction orthogonal to the direction in which the guide protrusion and the guide groove extend, the guide protrusion has a plane in surface contact with the plane, and the plane of the guide groove is larger than the guide protrusion.

2. The lens driving device according to claim 1, wherein: The guide mechanism includes a first guide mechanism arranged on one side of the optical axis direction and a second guide mechanism arranged on the other side of the optical axis direction. At least one of the first guiding mechanism or the second guiding mechanism includes the guiding protrusion and the guiding groove.

3. The lens driving device according to claim 2, wherein: The guide protrusion and the guide groove of the first guide mechanism extend in a first direction perpendicular to the optical axis direction; when viewed from the first direction, the guide protrusion and the guide groove on one side of a second direction perpendicular to both the optical axis direction and the first direction make line contact at two locations, and the guide protrusion and the guide groove on the other side of the second direction make surface contact, The guide protrusion and the guide groove of the second guide mechanism extend in the second direction. When viewed from the second direction, the guide protrusion and the guide groove on one side of the first direction make line contact at two locations, and the guide protrusion and the guide groove on the other side of the first direction make surface contact.

4. The lens driving device according to any one of claims 1 to 3, wherein: On the lens support body, one side of the magnet and the magnetic component is arranged on the side where the guide protrusion is in linear contact with the guide groove, parallel to the extension direction of the guide protrusion and the guide groove, and the other side of the magnet and the magnetic component is arranged on the frame body, opposite to the one side of the magnet and the magnetic component.

5. The lens driving device according to claim 4, wherein: The frame body moves together with the lens support body in the optical axis direction.

6. The lens driving device according to claim 1, wherein: The surface of the lens support body on which the guide groove is formed has a dummy recess formed near the guide groove.

7. The lens driving device according to claim 6, wherein: The bottom height of the dummy recess is equal to the bottom height of the guide groove.

8. The lens driving device according to claim 7, wherein: The lens support body is provided with a material injection port trace at a position that does not overlap with the guide groove in the optical axis direction, and the trace is located on a surface opposite to a surface where the guide groove and the dummy recess are formed.

9. The lens driving device according to claim 7, wherein: The lens support body is provided with a material injection port trace at a position overlapping with the dummy recess in the optical axis direction, and the trace is located on a surface opposite to a surface on which the guide groove and the dummy recess are formed.

10. A photographic device, characterized in that: The lens driving device comprises the lens driving device according to any one of claims 1 to 9, and a lens supported by the lens supporting body.

11. An electronic device, characterized in that: The device comprises the camera according to claim 10.

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