JP2005215430A - Lens driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact lens driving device with good accuracy and of simple constitution. <P>SOLUTION: The objective lens driving device is equipped with a lens holder 12 including an objective lens 11, and bobbins 13a and 13b for winding a coil formed on the outside parts 12a of the lens holder 12, and coils 16a and 16b are formed by winding a wire 14 around the bobbins 13a and 13b. The device is equipped with the bobbins 13a and 13b so as to be adjacent to both sides of another coil 15, and the coils 16a and 16b are formed on the bobbins 13a and 13b and also another coil 15 formed beforehand in a desired shape is stuck to the center of the outside part 12a of the lens holder 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an objective lens driving device including a lens holder containing an objective lens and a coil winding bobbin formed on the outer side of the lens holder, and a coil is formed by winding a wire around the bobbin. .

  As shown in FIG. 16, the conventional lens driving device is an objective lens driving device that drives a lens holder on which the objective lens 3 is mounted in two orthogonal directions using the same magnetic field formed by a magnetic circuit. The lens holder 2 is provided with a first bobbin portion around which the first drive coil 4 is wound, and the winding width of the first drive coil 4 of the lens holder 2 on the effective side of the first drive coil 4 on which an effective magnetic field acts. A second bobbin portion that protrudes in the vertical direction from the winding surface of the first drive coil 4 is provided from both outer portions.

Then, by winding the first drive coil 11 around the first bobbin portion from the upper side of the effective side of the first drive coil 11 so as to overlap the second drive coils 1a and 1b. There is one in which predetermined portions of the first drive coil 4 and the second drive coils 1a and 1b that are orthogonal to each other are arranged in the same magnetic field (for example, Patent Documents 1 and 2).
Thus, if the bobbin for forming the 2nd drive coils 1a and 1b is provided in the lens holder 2, a wire can be wound with an automatic winding machine and an individual variation can be made small.

  On the other hand, as shown in FIGS. 17 (a) and 17 (b), a focusing drive coil 6 and a tracking drive coils 5a and 5b, which are bonded and fixed so as to be positioned on the outer surface 7a of the lens holder 7, are provided. A lens driving device is disclosed (for example, Patent Document 3). As shown in FIG. 17A, these coils are attached by bonding or the like with air-core coils 5a, 5b, 6 formed by fusing the coated wires of the coils. However, there is a problem that the work is complicated and the sticking position tends to vary when sticking.

  In particular, if tilt control (radial direction, tangential direction) is controlled with an objective lens of an optical disc drive, it is necessary to attach more coils, which increases the effect of assembly variation and complicates the work during assembly. There is a problem.

Japanese Patent Laid-Open No. 10-027360 JP-A-11-283261 JP 2000-057600 A

As an alternative to coil bonding, as shown in FIG. 18, it is conceivable to provide bobbins 8a, 8b, 8c for winding the wire w around the lens holder and wind the wire w with an automatic winding machine. Variations in the coil attachment position can be reduced. However, in order to wind the wire w by the automatic winding machine, the nozzle member n for guiding the wire w needs to pass between the focusing drive coil 6 and the tracking drive coils 5a and 5b. As shown in FIG. 19, the coils cannot be brought close to each other, and the distance between the focusing drive coil 6 and the tracking drive coils 5a and 5b must be widened. There exists a problem that a lens holder will enlarge and an apparatus itself will enlarge.
SUMMARY OF THE INVENTION An object of the present invention is to provide a compact lens driving device with a simple configuration and high accuracy.

The invention according to claim 1 includes a lens holder that contains an objective lens;
A coil winding bobbin formed on the outer side of the lens holder,
In the objective lens driving device in which a coil is formed by winding a wire around the bobbin,
The bobbin is provided so as to be adjacent to another coil, the coil is formed on the bobbin, and the other coil formed in advance in a desired shape is attached to the outer side of the lens holder. .

According to the first aspect of the present invention, a bobbin is provided so as to be adjacent to another coil, the coil is formed on the bobbin, and another coil formed in advance in a desired shape is attached to the outer portion of the lens holder. Therefore, it is possible to reduce the number of parts to be attached by bonding, and to form a coil with an automatic machine at a part where work variation is likely to occur, thereby providing a device with stable performance.
Therefore, it is possible to provide a compact lens driving device with a simple configuration and high accuracy.

  According to a second aspect of the present invention, in the lens driving device according to the first aspect, the number of coils formed on the bobbin is greater than the number of the other attached coils.

According to the invention of claim 2, since there are more coils formed on the bobbin than other attached coils, instead of adhering all the coils, a part of all the coils are automatically and directly attached to the lens holder. Compared to the case where the attachment is performed by bonding, the coil work is simplified.
Therefore, it is possible to provide a compact lens driving device with a simple configuration and high accuracy.

  According to a third aspect of the present invention, in the lens driving device according to the first or second aspect, the plurality of wires having different driving directions are overlapped in order from the inside and wound to form a plurality of coils on one bobbin. It is characterized by that.

  According to the third aspect of the present invention, a plurality of coils having different driving directions are overlapped in order from the inside and wound to form a plurality of coils on one bobbin. Workability in the case of arranging at substantially the same position is improved.

  According to a fourth aspect of the present invention, in the lens driving device according to the first or second aspect, the coil or the another coil is formed by winding a plurality of the wires in parallel. .

  According to the invention of claim 4, since the coil or another coil is formed by winding a plurality of wires in parallel, the distance between each coil and the opposing magnet does not change, so that the thrust Prevents the decline.

  According to a fifth aspect of the present invention, in the lens driving device according to the first or second aspect, the coil or the another coil is provided close to the axial position of the bobbin. .

  According to the invention of claim 5, since the coil or another coil is provided close to the bobbin in the axial direction, a plurality of coils are arranged at substantially the same position for control in a plurality of directions. Workability is improved.

The invention described in claim 6 includes a lens holder that encloses the objective lens, and a plurality of coil winding bobbins formed on the outer side of the lens holder, and a wire is wound around the plurality of bobbins. In the objective lens driving device in which a plurality of coils are formed,
The plurality of coils are formed by winding the wire at different distances from the outer side of the lens holder.

  According to the invention of claim 6, since the plurality of coils are formed by winding the wire at different distances from the outer side of the lens holder, by shifting in the axial direction of the coil, from the surface facing the magnet It is possible to reduce the size of the apparatus by reducing the interval between the coils as seen.

  According to a seventh aspect of the present invention, in the lens driving device according to the sixth aspect, among the plurality of coils, a coil located at the center is formed in a direction away from the outer portion of the lens holder as compared with other coils. It is characterized by doing.

  According to the invention of claim 7, among the plurality of coils, the coil located at the center is formed in a direction away from the outer side of the lens holder as compared with the other coils, so that the coil follows the shape of the lens, Since the front-rear relationship is determined, the dimension of the objective lens frame in the wire longitudinal direction can be shortened.

The invention according to claim 8 is an objective lens driving device comprising: a lens holder containing an objective lens; and a coil winding bobbin formed on the outer side of the lens holder.
The bobbin is provided on the outer side of the lens holder to form a coil, and a plurality of bobbins are provided on both sides of the mounting window of the mounting plate on which the mounting window is formed to form another coil. When the coil is attached to the outer side of the lens holder while aligning the coil with the mounting window, the another coil is provided adjacent to both sides of the coil.

  According to the invention of claim 8, a bobbin is provided on the outer side of the lens holder to form a coil, and a plurality of bobbins are provided on both sides of the mounting window of the mounting plate on which the mounting window is formed to form another coil. And when it was attached to the outer side of the lens holder while aligning the coil with the mounting window of the mounting plate, it was provided so that another coil was adjacent to both sides of the coil, so the adhesive surface can be widened, Bonding work becomes easy. In addition, the coil wound around the bobbin can be arranged close to a substantially planar shape.

According to a ninth aspect of the present invention, a lens holder including an objective lens, and a plurality of bobbins for winding a coil on an outer portion of the lens holder, a plurality of coils are wound by winding a wire around the plurality of bobbins. In the objective lens driving device formed with
The plurality of bobbins are connected through a bent portion to form a bobbin unit. When forming the plurality of coils, the wire is wound by bending the bent portion, and the bobbin unit is attached to the lens holder. The bent portion is extended and attached.

  According to the invention of claim 9, a plurality of bobbins are connected to each other through the bent portion to form a bobbin unit, and when forming the plurality of coils, the wire is wound by bending at the bent portion, and the bobbin unit is attached to the lens holder. At the time of attachment, since the bent portion is extended and attached, it is possible to wind the coil close to a substantially planar shape with an automatic winding machine.

  According to a tenth aspect of the present invention, in the lens driving device according to any one of the first to ninth aspects, the inclination of the coil is corrected in accordance with the shape of the outer portion of the lens holder to which the bobbin is attached. A bobbin is formed.

  According to the invention of claim 10, since the bobbin is formed so as to correct the inclination of the coil in accordance with the shape of the outer portion of the lens holder to which the bobbin is attached, the shape of the bobbin end face is formed in accordance with the draft. This simplifies the mold structure of the objective lens frame. Moreover, since it is not necessary to touch the wire directly, the wire is not damaged.

  According to an eleventh aspect of the present invention, there is provided an optical disk drive device comprising the lens driving device according to any one of the first to tenth aspects.

  According to the eleventh aspect of the present invention, the performance of the optical disk drive device is improved by mounting the objective lens having a stable quality.

  A twelfth aspect of the present invention is an optical pickup comprising the lens driving device according to any one of the first to tenth aspects.

  According to the invention of claim 12, the performance of the optical pickup is improved by mounting the objective lens having a stable quality.

According to the first aspect of the present invention, a bobbin is provided so as to be adjacent to another coil, the coil is formed on the bobbin, and another coil formed in advance in a desired shape is attached to the outer portion of the lens holder. Since it is attached, it is possible to reduce the number of parts to be attached by adhesion, and to form a coil by an automatic machine in a part where work variation is likely to occur, and to provide a device with stable performance.
Therefore, it is possible to provide a compact lens driving device with a simple configuration and high accuracy.

According to the invention described in claim 2, since there are more coils formed on the bobbin than other attached coils, instead of adhering all the coils, all of them are directly and directly attached to the lens holder. Compared to the case where the coil is attached by bonding, the coil operation can be simplified.
Therefore, it is possible to provide a compact lens driving device with a simple configuration and high accuracy.

  According to the third aspect of the present invention, a plurality of coils having different driving directions are overlapped in order from the inside and wound to form a plurality of coils on one bobbin. The workability when the coils are arranged at substantially the same position can be improved.

  According to the invention of claim 4, since the coil or another coil is formed by winding a plurality of wires in parallel, the distance between each coil and the opposing magnet can be kept unchanged. It is possible to prevent a decrease in thrust.

  According to the fifth aspect of the present invention, since the coil or another coil is provided close to the bobbin in the axial direction, the plurality of coils are arranged at substantially the same position for control in a plurality of directions. The workability in the case can be improved.

  According to the sixth aspect of the present invention, since the plurality of coils are formed by winding the wires at different distances from the outer portion of the lens holder, the surface facing the magnet can be obtained by shifting in the axial direction of the coils. Since the distance between the coils viewed from the side can be reduced, the apparatus can be miniaturized.

  According to the seventh aspect of the present invention, the coil located at the center of the plurality of coils is formed in a direction away from the outer portion of the lens holder as compared with the other coils, so that the coil follows the shape of the lens. Since the front-rear relationship is determined, the length of the objective lens frame in the wire longitudinal direction can be shortened and made compact.

  According to the eighth aspect of the present invention, the bobbin is provided on the outer side of the lens holder to form a coil, and a plurality of bobbins are provided on both sides of the mounting window of the mounting plate on which the mounting window is formed. When affixed to the outer side of the lens holder while aligning the coil with the mounting window of the mounting plate, the adhesive surface can be widened because another coil is provided adjacent to both sides of the coil. Therefore, the bonding work becomes easy. Further, the coil wound around the bobbin can be arranged close to a substantially planar shape.

  According to the ninth aspect of the present invention, a plurality of bobbins are connected to each other through the bent portions to form a bobbin unit. When forming a plurality of coils, the bobbin unit is wound by bending at the bent portions. At the time of attachment to the lens holder, since the bent portion is extended and attached, the coil can be wound close to a substantially planar shape by an automatic winding machine.

  According to the invention described in claim 10, since the bobbin is formed so as to correct the inclination of the coil in accordance with the shape of the outer portion of the lens holder to which the bobbin is attached, the shape of the bobbin end surface is adjusted in accordance with the draft. By forming, the structure of the mold of the objective lens frame can be simplified. In addition, if the lens holder is designed to simplify the mold structure of the lens holder, it is difficult for the lens holder to be parallel to the optical axis, which affects the coil mounting accuracy, but directly contacts the coil wire and damages the wire. Nothing will happen.

  According to the eleventh aspect of the present invention, it is possible to improve the performance of the optical disk drive device by mounting the objective lens with stable quality.

  According to the twelfth aspect of the present invention, it is possible to improve the performance of the optical pickup by mounting the objective lens having a stable quality.

[First Embodiment]
FIG. 1 is a perspective view of an embodiment of a lens driving device of the present invention. The lens driving device includes a lens holder 12 that contains the objective lens 11 and coil winding bobbins 13a and 13b formed on the outer side 12a of the lens holder 12, and a wire 14 is attached to the bobbins 13a and 13b. The coils 16a and 16b are formed by winding.

  Specifically, another coil 15 formed in a desired shape in advance is attached to the center of the outer portion 12a of the lens holder 12, and bobbins 13a and 13b are provided so as to be adjacent to both sides of the other coil 15, Coils 16a and 16b are formed on the bobbins 13a and 13b.

  That is, if one another coil 15 (air-core coil) is stuck, the work efficiency is good, and the influence of variation in the sticking position is small. Therefore, as shown in FIGS. 2 (a) and 2 (b), after the wire 14 is wound around the bobbins 13a and 13b, another coil 15 that is an air-core coil is adhered to the center with an adhesive or the like. . You may provide the projection part for positioning in the center hole of a coil in the attachment position of the air core coil stuck later.

At this time, as shown in FIGS. 3A and 3B, when the wire 14 is wound around the bobbins 13a and 13b, a plurality of wires 14 may be wound to form a plurality of coils 16a and 16b.
That is, a plurality of wires 14 having different driving directions may be overlapped in order from the inside and wound to form a plurality of coils 16a and 16b on one bobbin.

  That is, the coils 16 (a), 16 (b), and 15 are wound sequentially from the inside without providing a flange for partitioning the coils on the bobbin 13. In the figure, an example in which three coils are formed is illustrated, but it may be two or four or more.

  Since the length of the part that acts on the drive on the inner side becomes shorter, if the current and number of turns are the same, the generation of thrust will be smaller, so the number of turns and the current that flows can be changed, or depending on the required thrust Decide whether to wind the wire on the outside or on the inside. For example, when the coil necessary for focusing, radial tilt, and tangential tilt drive control of the objective lens is formed by winding a wire around a bobbin, the focusing coil that requires the most thrust is placed on the outermost side. Can be considered.

  Further, the coils 16a, 16b or another coil 15 may be formed by winding a plurality of wires 14 in parallel.

  That is, as shown in FIGS. 4A and 4B, the wires 14 are wound in parallel in the same direction, and a plurality of coils 15, 16a, 16b are formed at the same position. Although the figure shows an example in which three wires are wound, the number may be two or four or more.

In the above example, the coil wound inside has a great influence when the relative positional relationship with the magnet is shifted by driving, but the length of the portion acting on driving can be the same for any coil. No coil affected.
When the required thrust differs depending on the driving direction, it is also conceivable to reduce the number of turns by changing the current to flow and delaying the start of winding of some wires from the start of winding of other wires.

  Furthermore, as shown in FIG. 5, the coil 15 or other coils 16 a and 16 b may be provided close to each other while being displaced in the axial direction of the bobbin.

Specifically, the bobbin 13a will be described as an example. A spacer 21 for partitioning the three coils 15, 16a, and 16b is provided, and a wire 14 is wound between the spacers 21 to form desired coils 15, 16a, and 16b, respectively. Are formed separately. In other words, the coil bobbin is wound around the coil where multiple coils are wound, and the position where only one-way control is performed is determined by whether the coil bobbin is brought to the center or both ends so that the coil is bonded. .
In this example, three coils 15, 16a and 16b are formed on one bobbin 13a. However, the present invention is not limited to this.

In this example, the case where three coils, another coil 15, and coils 16a and 16b are arranged is described as an example. However, when two coils are arranged, one is wound around a bobbin. This is true even if the coil and the other are in the form of attaching an air-core coil. The same applies when four or more coils are arranged.
Further, the driving method for arranging the coils 15, 16a, 16b on the objective lens 11 side has been described. However, for the coil holding when the permanent magnet is arranged on the objective lens 11 side and the coil is arranged in the vicinity of the lens holder 12. Is also applicable.

  The driving direction is supported by four wires 20 as shown in FIG. 1, and is moved in the direction when a driving force is generated in the optical axis direction and the direction perpendicular to the optical axis. In addition, as shown in FIG. 6, it can be moved in two directions perpendicular to the optical axis by holding it nested so that it can move vertically and horizontally and generating a driving force in that direction. It can also be used as lens driving means such as camera shake correction.

[Second Embodiment]
FIG. 7 is a perspective view of another embodiment of the lens driving device of the present invention. The lens driving device includes a lens holder 12 containing the objective lens 11 and a coil winding bobbin 13c formed on the outer side 12a of the lens holder 12, and a wire 14 is wound around the bobbin 13c to form a coil. 15 are formed adjacent to each other.

  Specifically, the coil 15 is formed by providing a bobbin 13 c at the center of the outer portion 12 a of the lens holder 12, and other coils 16 a and 16 b formed in a desired shape are adjacent to both sides of the other coil 15. Stick to form.

  When the three coils 15, 16 a, and 16 b are arranged close to each other on the outer portion 12 a of the lens holder 12, the central coil 15 has a bobbin 13 c on the lens holder 12 as shown in FIG. The wire 15 is wound around the bobbin 13c by an automatic winding machine, and the coil 15 is formed as shown in FIG. 8B. As the other coils 16a and 16b at both ends, those wound with an air core are prepared in advance, and the coils on both sides are attached after being wound with a winding machine. In this way, the operation becomes easier as compared to the case where all the coils are bonded together.

[Third Embodiment]
FIG. 9A is a front view of another embodiment of the lens driving device of the present invention, and FIG. The lens driving device includes a lens holder 12 containing the objective lens 11, and three bobbins 13a, 13b, and 13c for coil winding formed on the outer side portion 12a of the lens holder 12, and the three bobbins 13a. , 13b, 13c, and the wire 14 is wound to form three coils 15, 16a, 16b.

  Specifically, the coil 15 is first formed by winding a wire as shown in FIG. 10A, with different distances L1, L2, and L3 from the outer portion 12a of the lens holder 12, and then FIG. As shown in FIG. 10B, the coils 16a and 16b are formed to form a lens driving device as shown in FIG. At this time, in order to change the distances L1, L2, and L3 from the outer portion 12a of the lens holder 12, the bobbins 13a and 13b are made longer than the bobbin 13c by attaching the spacer 21 to the bobbins 13a and 13b. Form with different end faces. In this way, by shifting in the depth direction, it is possible to secure the passage of the nozzle member of the winding machine, to make the coils 15, 16a, 16b closer, and to make the lens driving device more compact. it can.

That is, as shown in FIG. 10A, compared with the bobbin 13c, the spacers 21 are attached to the bobbins 13a and 13b at both ends, and the bobbins 13a and 13b are projected.
Instead of FIGS. 10A to 10C, as shown in FIGS. 11A, 11B, and 11C, the center of the outer portion 12a of the lens holder 12 is formed in a convex shape, and the spacer 21 is formed. The bobbins 13a to 13c may be provided so that the bobbin 13c protrudes.

  In this case, first, as shown in FIG. 11B, the wires 14 are wound around the bobbins 13a and 13b at both ends to form the coils 16a and 16b, and then the wire 14 is wound around the central bobbin 13c to form the coil 15. To do. In this example, since the coils 16a to 16c can be arranged along the shape of the side surface of the lens, the shape of the lens holder 12 can be made smaller than when the coils 16a and 16b at both ends are protruded. . Further, the lens holder can be reduced in weight. Further, since the protruding portion is reduced, when the objective lens 11 of the optical disk is driven at the speed of light, it is difficult to elastically deform and the gain margin of higher order resonance is improved.

  10 and 11, the coils can be continuously arranged adjacent to each other, and the apparatus can be downsized.

[Fourth Embodiment]
12 (a) and 12 (b) are perspective views of still another embodiment of the lens driving device of the present invention. FIG. 12 (a) shows a state before the plate-like member is attached, and FIG. 12 (b) shows a plate-like member. After attaching. The lens driving device includes a lens holder 12 that contains the objective lens 11, and a coil winding bobbin 13 c formed on the outer side 12 a of the lens holder 12.

  Specifically, the bobbin 13c is provided on the outer portion 12a of the lens holder 12 to form the coil 15, and two bobbins 13a and 13b are provided on both sides of the mounting window 23 of the mounting plate 24 on which the mounting window 23 is formed. When 16a and 16b are formed and the mounting plate 24 is attached to the outer side of the lens holder while aligning the coil 15 with the mounting window 23, the coils 16a and 16b are provided adjacent to both sides of the coil 15.

  That is, apart from the lens holder 12 in which the bobbin 13c is provided in the center and the coil 15 is formed, a mounting plate 24 having a mounting window 23 formed in the center is prepared. The attachment window 23 is formed so that the coil 15 penetrates when the attachment plate 24 is attached to the outer portion 12 a of the lens holder 12. Further, adjacent to both sides of the mounting window 23, bobbins 13a and 13b are provided to form coils 16a and 16b.

  Then, the attachment window 23 of the attachment plate 24 is attached through the coil 15, and the back surface of the attachment plate 24 and the outer portion 12a of the lens holder 12 are adhered and fixed with an adhesive or the like. At this time, another coil 15 and the coils 16a and 16b formed on the mounting plate 24 are adjacent to each other.

  The lens holder 12 is provided with the bobbin 13 of the coil 15 arranged in the center among the three coils 15, 16 a, 16 b in which the wire 14 is wound, and the wire 14 is wound around the coil holder 15. The coil 15 is formed. On the other hand, a bobbin 13 is formed on the mounting plate 24 as a means for arranging the coils 16a and 16b at both ends, and a mounting window 23 for avoiding the bobbin 13 of the lens holder 12 is opened between the bobbin 13 and the bobbin 13. .

  A wire 14 is wound around each bobbin 13 in a state of being separated from the lens holder 12, and coils 16a and 16b are formed. As shown in FIG. 12B, the two coils 16 a and 16 b are attached to the lens holder 12 while avoiding the bobbin 13 on the lens holder 12 side with the attachment window 23 of the attachment plate 24. Note that the mounting plate 24 may also serve as a relay substrate for holding the end of the wire 14.

[Fifth Embodiment]
13 (a) and 13 (b) are cross-sectional views of another embodiment of the lens driving device of the present invention. FIG. 13 (a) shows a state in which a wire is wound around a bobbin, and FIG. b) is a view showing a state where a coil is formed and a bobbin unit is formed.
A lens holder 12 containing the objective lens 11, and three bobbins 13 a, 13 b, 13 c for winding a coil are provided on the outer portion 12 a of the lens holder 12, and a wire 14 is wound around the three bobbins 13 a to 13 c. Thus, the coils 15, 16a and 16b are formed adjacent to each other.

  Specifically, three bobbins 13a to 13c are connected to each other via a bent portion 26 to form a bobbin unit 27. When the coils 15, 16a, and 16b are formed, as shown in FIG. When the bobbin unit 27 is attached to the lens holder 12, the bent portion 26 is extended to attach the attachment surface 27a to the outer portion 12a of the lens holder 12, as shown in FIG. Attach it with an adhesive.

  That is, as shown in FIG. 13A, the wire 14 is wound around each bobbin 13 a to 13 c with a winding machine in a state where it is bent at the bending portion 26. Since the bobbins 13a to 13c and the coils 15, 16a and 16b are removed from the path of the nozzle member 25 for guiding the wire 14 to be wound by bending at the bending portion 26, the nozzle member 25 is separated from another coil or bobbin. The wire 14 can be wound around each bobbin with a winding machine.

  After winding the wire 14 and forming the coil, as shown in FIG. 13B, the bent portion 26 is extended and the three coils, the coils 15, 16a, and 16b are close to each other and arranged in a plane. It becomes a state. A boss and a boss hole can be considered as positioning means for setting in the winding machine and as a positioning means for attaching the lens holder. If a boss hole is provided in the flange portion of the lens bobbin, the positioning means can be shared if it is placed so as to fit both the boss of the winding machine and the boss of the lens case.

In addition, the bobbin of the lens driving device may be molded and attached in a shape that corrects the inclination of the coil in accordance with the shape of the outer side of the lens holder that is the mounting surface of the flange portion.
That is, when the mold of the lens holder 12 is formed in two parts in the optical axis direction, the outer portion 12a indicated by the arrow in FIG. It is difficult to ensure the accuracy of the outer portion 12a, which is a surface to which a coil is attached for a parting line or the like.

Therefore, a large draft is provided on the outer portion 12a of the lens holder 12 as shown in FIGS. 14 (b) and 14 (c). Since a large draft is originally provided, it is easy to perform die-cutting, and it is easy to maintain the precision of the draft plane. If the shape of the flange 30 on the attachment side of the bobbin 13 is made in accordance with the draft as shown in FIGS. 15A and 15B, the inclination of the end face 31 when the coil is attached can be reduced.
This method can also be applied to the case where the coil is attached between the bobbin when the bobbin 13 is provided on the coil mounting surface.
The coils 15, 16a16b are preferably applied to any of a focus coil, a radial (tilt) coil, and a tangential (tilt) coil. At this time, both a radial (tilt) coil and a tangential (tilt) coil are not necessarily required, and a focus coil and a radial (tilt) coil or a combination of a focus coil and a tangential (tilt) coil may be used.

  Further, this lens driving device can be applied to an optical disk drive device and an optical pickup.

1 is a perspective view showing a first embodiment as an example of a lens driving device of the present invention. (A), (b) is the figure which showed the condition which forms a coil in the lens drive device of FIG. 5A and 5B show a fifth embodiment as an example of a lens driving device according to the present invention, in which FIG. 4A and 4B show a fourth embodiment as an example of a lens driving device of the present invention, in which FIG. It is a principal part expanded side view which shows another example of the lens drive device of this invention. It is a top view which shows another example of the lens drive device of this invention. It is a perspective view which shows 2nd Embodiment as an example of the lens drive device of this invention. (A), (b) is the figure which showed the condition which forms a coil in the lens drive device of FIG. A third embodiment as an example of a lens driving device of the present invention is shown, (a) is a front view, and (b) is a plan view of a main part. (A)-(c) is the figure which showed a mode that a coil was formed in the lens drive device of FIG. (A)-(c) is the figure which showed a mode that a coil was formed in the modification of the lens drive device of FIG. It is a perspective view which shows 6th Embodiment as an example of the lens drive device of this invention, (a) is a figure which showed the mode after attaching a mounting plate, (b) before attaching a mounting plate. is there. It is sectional drawing which shows 7th Embodiment as an example of the lens drive device of this invention, (a) is the state which has attached the coil, (b) has stuck on the lens holder, after attaching a coil. It is the figure which showed the state. (A)-(c) is a figure for demonstrating the shaping | molding method of the lens drive device of this invention. (A), (b) is the figure which formed according to the shape of the outer side part of the lens holder of FIG.14 (b), (c), and showed the flange, respectively. It is the side view which showed the conventional lens drive device. It is the perspective view which showed the conventional lens drive device, (a) is a figure which showed a mode that the coil was affixed, (b) is the figure which affixed the coil. It is a figure for demonstrating a mode that a coil is formed in the lens drive device of FIG. It is another side view which showed the conventional lens drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Objective lens 12 Lens holder 12a Outer part 13a, 13b, 13c Bobbin 14, 20 Wire 15, 16a, 16b Coil 21 Spacer 23 Mounting window 24 Mounting plate 25 Nozzle member 26 Bending part 27 Bobbin unit 30 Flange 31 End face

Claims (12)

A lens holder containing the objective lens;
A coil winding bobbin formed on the outer side of the lens holder,
In the objective lens driving device in which a coil is formed by winding a wire around the bobbin,
The bobbin is provided so as to be adjacent to another coil, the coil is formed on the bobbin, and the other coil formed in advance in a desired shape is attached to an outer portion of the lens holder. Lens drive device.   2. The lens driving device according to claim 1, wherein the number of coils formed on the bobbin is greater than that of the another attached coil.   3. The lens driving device according to claim 1, wherein a plurality of coils are formed on a single bobbin by overlapping and winding a plurality of wires having different driving directions from the inside in order.   The lens driving device according to claim 1, wherein the coil or the another coil is formed by winding a plurality of the wires in parallel.   3. The lens driving device according to claim 1, wherein the coil or the another coil is provided close to the bobbin in a position shifted in an axial direction. 4. A lens holder containing the objective lens;
A plurality of bobbins for coil winding formed on the outer side of the lens holder,
In the objective lens driving device in which a plurality of coils are formed by winding wires around the plurality of bobbins,
The lens driving device, wherein the plurality of coils are formed by winding the wire at different distances from the outer side of the lens holder.   The lens driving device according to claim 6, wherein among the plurality of coils, a coil located at the center is formed in a direction away from an outer portion of the lens holder as compared with other coils. A lens holder containing the objective lens;
In an objective lens driving device comprising a coil winding bobbin formed on the outer side of the lens holder,
The bobbin is provided on the outer side of the lens holder to form a coil, and a plurality of bobbins are provided on both sides of the mounting window of the mounting plate on which the mounting window is formed to form another coil. A lens driving device characterized in that when the coil is attached to the outer side of the lens holder while the coil is aligned with an attachment window, the other coil is provided adjacent to both sides of the coil. A lens holder containing the objective lens;
A plurality of bobbins for winding a coil on the outer side of the lens holder;
In the objective lens driving device in which a plurality of coils are formed by winding wires around the plurality of bobbins,
The plurality of bobbins are connected via a bent portion to form a bobbin unit,
When forming the plurality of coils, bend the wire at the bent portion,
The lens driving device according to claim 1, wherein when the bobbin unit is attached to the lens holder, the bent portion is extended.   The lens driving device according to any one of claims 1 to 9, wherein the bobbin is formed so as to correct the inclination of the coil in accordance with the shape of the outer side of the lens holder to which the bobbin is attached. .   An optical pickup comprising the lens driving device according to claim 1. An optical disk drive device comprising the lens driving device according to claim 1.

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