WO2007029490A1

WO2007029490A1 - Lens moving device and disk device

Info

Publication number: WO2007029490A1
Application number: PCT/JP2006/316422
Authority: WO
Inventors: Osami Utsuboya
Original assignee: Pioneer Corporation
Priority date: 2005-09-09
Filing date: 2006-08-22
Publication date: 2007-03-15
Also published as: JPWO2007029490A1

Abstract

A lens moving device in which the ability of a lens to follow warp and surface run-out of an optical disk can be obtained by a simple adjustment means. The lens moving device (100) has a lens support body (104), a first lens position adjustment means (101) for adjusting the lens position in a focal point direction, and a second lens position adjustment means (102) for adjusting the lens position in a focal point direction. The first lens position adjustment means (101) is provided inside (IN) a scan direction of the lens support body (104) and adjusts the position in the direction (F) of the focal point of a lens (103) by magnetic force (P1). The second lens position adjustment means (102) is provided outside (OUT) the scan direction of the lens support body (104), adjusts the position in the direction (F) of the focal point of a lens (103) by magnetic force, and produces greater magnetic force (P2) than the first lens position adjustment means (101).

Description

Specification

Lens moving device and disk device

Technical field

The present invention relates to a technique for adjusting the position of a lens of an optical pickup provided in an optical disc apparatus.

Background art

In a disk device that reproduces information recorded on an optical disk or the like, or records and reproduces information on an optical disk or the like, light used for reading information or recording information is obtained by a lens provided in the optical system. It converges and irradiates the optical disc. This lens is generally attached to a support, and the position in the focal direction and the position in the scanning direction are adjusted by a magnetic field generated by a coil provided on the support. Patent Document 1 discloses an optical pickup that supports a lens holder by a plurality of springs so as to be swingable.

[0003] Patent Document 1: Japanese Patent Laid-Open No. 2003-346368

Disclosure of the invention

Problems to be solved by the invention

[0004] By the way, the optical disk looks flat at first glance, but warpage may occur due to manufacturing variations, usage environment, and the like. Also, since the optical disk rotates at a high speed, if the mass balance of the optical disk is biased, the surface deflection of the optical disk may occur due to this. If the optical disk is warped, or if surface wobbling occurs during rotation, the optical disk tilts and affects the information reading performance. Therefore, when reading or recording information, it is necessary to make the lens follow the inclination of the recording surface of the optical disk and maintain the difference between the inclination of the optical disk and the lens within a certain value.

[0005] In the technique disclosed in Patent Document 1, the lens is supported in the focal direction by supporting the lens holder with a spring having a different spring constant by adjusting the size and shape of the spring supporting the lens holder. It is conceivable to cause the lens to follow the warp of the optical disk when moving to the position. However, it is difficult to adjust the size and shape of the spring supporting the lens holder, which has a wire diameter as small as several tens / zm, on the order of several μm. [0006] Therefore, the present invention solves the above-described problem as an example, and a lens movement capable of giving the lens followability with respect to warpage or surface deflection of an optical disk by a simple adjustment means. An object is to provide a device and a disk device.

Means for solving the problem

The invention described in claim 1 is provided on a lens support body that supports a lens that irradiates a recording medium with light from a light source, and on the inner side of the lens support body in the scanning direction of the lens with respect to the recording medium. A first focus direction position adjusting means for adjusting the position of the lens in the focal direction by a magnetic force; and provided outside the lens support in the scanning direction of the lens with respect to the recording medium. And a second focal direction position adjusting unit that adjusts a position of the lens in the focal direction and generates a magnetic force larger than that of the first focal direction position adjusting unit. is there.

Brief Description of Drawings

FIG. 1 is a side view showing a lens moving device according to this embodiment.

FIG. 2 is a plan view showing the disk device according to the first embodiment.

FIG. 3 is an explanatory diagram of a scanning direction and a focal direction.

FIG. 4 is a perspective view showing an optical system of an optical pickup provided in the disk device according to Embodiment 1.

FIG. 5 is an explanatory view showing a modification of the lens moving actuator included in the lens moving device according to the first embodiment.

FIG. 6-1 is an explanatory diagram of an operation of the lens moving device according to the first embodiment.

FIG. 6-2 is an explanatory diagram of an operation of the lens moving device according to the first embodiment.

FIG. 7-1 is an explanatory diagram of a configuration of the lens moving device according to the second embodiment.

FIG. 7-2 is an explanatory diagram of a configuration of the lens moving device according to the second embodiment.

FIG. 7-3 is an explanatory diagram of a configuration of the lens moving device according to the second embodiment.

FIG. 8-1 is an explanatory diagram of an operation of the lens moving device according to the second embodiment.

FIG. 8-2 is an explanatory diagram of an operation of the lens moving device according to the second embodiment.

[FIG. 9-1] FIG. 9-1 is a side view showing the state where the actuator substrate is bonded to the lens holder. [Fig. 9-2] Fig. 9-2 is a side view showing a state where the actuator substrate is bonded to the lens holder.

[Fig. 10] Fig. 10 is an explanatory diagram showing a change in temperature of the lens with time when a current is passed through the focus coil or tracking coil in the lens moving device according to the second embodiment.

Explanation of symbols

[0009] 1 disk device

2 Optical pickup

2L optical system

15 Lens

19 Optical disc

301 Inner side j Focus coin

30O inner j focus focus

40, 40a, 100 lens moving device

50 Lens holder

101 First focal direction position adjusting means

102 Second focal direction position adjusting means

103 Lens

104 Lens support

105 Recording media

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the best mode for carrying out the invention (hereinafter referred to as an embodiment). In addition, constituent elements in the embodiments described below include those that can be easily assumed by those skilled in the art or those that are substantially the same.

FIG. 1 is a side view showing a lens moving device according to this embodiment. The lens moving device 100 according to this embodiment is mounted on an optical pickup of a disk device, and causes the lens 103 to follow a warp or a surface shake of the recording medium 105. As shown in Figure 1, this embodiment The lens moving apparatus 100 according to the embodiment includes a lens support 104, a first focal direction position adjusting unit 101, and a second focal direction position adjusting unit 102.

The lens support 104 supports the lens 103. The lens 103 converges light having a light source power such as a laser diode to irradiate the recording medium 105. The lens 103 moves in the focal direction F to focus on the recording surface of the recording medium 105, and moves in the scanning direction S to sequentially read information recorded on the recording medium 105, Record information to 105.

[0013] The first focal direction position adjusting means 101 is provided on the inner side IN of the lens support 104 in the scanning direction of the lens 103 with respect to the recording medium 105, and the focal direction of the lens 103 by the magnetic force P.

1

Adjust the position of F. The second focal direction position adjusting means 102 is provided on the lens support 104 on the outer OUT side in the scanning direction of the lens 103 with respect to the recording medium 105, and adjusts the position of the lens 103 in the focal direction F by magnetic force. And the magnetic force P larger than the first focal direction position adjusting means 101

Generate 2 Here, the inner side IN of the lens 103 in the scanning direction is the rotation center axis Zr side of the recording medium 105, and the outer side OUT of the scanning direction of the lens 103 is the outer side in the radial direction of the recording medium 105.

As described above, in the lens moving device 100 according to this embodiment, the magnetic force P 1S generated by the second focus direction position adjusting unit 102 P 1S is generated by the first focus direction position adjusting unit 101.

2

Greater than force P. Therefore, the first and second focus direction position adjusting means 101, 102

1

When the lens 103 is moved in the focal direction F, the moving amount of the lens moving device 100 is larger on the radially outer side of the recording medium 105 than on the radially inner side (that is, on the rotation center axis Zr side). .

As a result, for example, when the recording medium 105 is warped, if the lens moving device 100 moves in a direction approaching the recording medium 105, the outer side in the scanning direction of the lens moving device 100 moves toward the recording medium 105. Tilt. As a result, the lens 103 can follow the warp of the recording medium 105. When the lens moving device 100 moves away from the recording medium 105, the outer side of the lens moving device 100 in the scanning direction is inclined away from the recording medium 105. As a result, the lens 103 can follow the warp of the recording medium 105.

In the lens moving device 100 according to this embodiment, the first focal direction position adjustment By adjusting the magnetic force of the means 101 and the second focus direction position adjusting means 102, it is possible to adjust the characteristic that the lens 103 follows the warp and the surface shake of the recording medium 105. Therefore, it is much easier to adjust the tracking characteristics of the lens 103 than when the characteristics of the spring supporting the lens support 104 are changed.

Here, the first focal direction position adjusting unit 101 and the second focal direction position adjusting unit 102 can use coils. Then, the magnetic force P generated by the second focal direction position adjusting unit 102 is made larger than the magnetic force P generated by the first focal direction position adjusting unit 101.

2 1, the number of turns of the second focus direction position adjusting means 102 is set to be larger than the number of turns of the first focus direction position adjusting means 101. In this way, the magnetic force can be adjusted only by adjusting the number of turns of the coil, and fine adjustment of the magnetic force is easy. Accordingly, in the lens moving device 100 according to this embodiment, the lens can follow the disc warp or the surface shake by a simple adjustment means.

[0018] Further, the magnetic force generation width of the second focal direction position adjusting means 102 in the scanning direction S of the lens 103 with respect to the recording medium 105 is set as the first focal direction position adjustment in the scanning direction S of the lens 103 with respect to the recording medium 105. Make P> P larger than the magnetic force generation width of means 101.

2 1 May be adjusted. Even in this case, it is possible to give the lens followability with respect to the warp or surface deflection of the disk by a simple adjusting means.

The first focal direction position adjusting unit 101 and the second focal direction position adjusting unit 102 may be configured by forming a coil on the surface of a substrate provided on the lens support 104. In this way, the number of turns of the first focus direction position adjusting means 101 and the magnetic force generation width in the scanning direction S can be changed simply by changing the printed pattern of the substrate. As a result, it is possible to give the lens followability to the warp or surface deflection of the disk by a simple adjustment means.

As described above, in this embodiment, the lens support 104 that supports the lens 103 that converges the light having the light source power and irradiates the recording medium 105, and the lens support 104 with respect to the recording medium 105. The lens 103 is provided on the inner side IN of the scanning direction IN, and the lens P

1

The first focus direction position adjusting means 101 for adjusting the position of the focus direction S of the lens 103 and the lens support 104 on the outer side of the lens 103 in the scanning direction of the lens 103 with respect to the recording medium 105 A second focus direction that is provided at T and adjusts the position of the lens 103 in the focal direction S by the magnetic force, and generates a larger magnetic force より than the first focal direction position adjusting means 101.

2

Position adjusting means 102. In this embodiment, by adjusting the magnetic force of the first focal direction position adjusting unit 101 and the second focal direction position adjusting unit 102, the lens 103 follows the warp and the surface shake of the recording medium 105. Therefore, it is easy to adjust the tracking characteristic of the lens 103. As a result, it is possible to give the lens followability with respect to the warp or surface deflection of the disk by a simple adjustment means. Example 1

FIG. 2 is a plan view showing the disk device according to the first embodiment. This figure shows a state in which a disk device having a force opposite to the disk mounting side is viewed. FIG. 3 is an explanatory diagram of the scanning direction and the focal direction. FIG. 4 is a perspective view illustrating an optical system of an optical pickup provided in the disk device according to the first embodiment. The disc device 1 reproduces information recorded on an optical disc (recording medium) such as a CD (Compact Disc) or a DV D (Digital Versatile Disc). Note that the disk device according to this embodiment may further have a function of recording information on the optical disk.

[0022] The disk device 1 is normally stored in a housing. The disk device 1 includes an optical disk driving means, an information reading means for reading information recorded on the optical disk, and the like. Devices such as an optical disk driving unit, an information reading unit, an information reading unit support, and an information reading unit driving unit are attached to the frame 18 included in the disk device 1.

[0023] An electric motor 8 which is an optical disk driving means is attached to a frame 18 and rotates an optical disk. The optical pickup 2 includes an optical system 2L for reading information recorded on the optical disk. Then, the optical pickup 2 as information reading means moves in the radial direction of the optical disk (arrow S direction, that is, scanning direction) while the optical disk is rotating, and reads information recorded on the optical disk. In the case where the disk device 1 has a function of recording information on the optical disk, the information is recorded on the optical disk in the process of moving in the radial direction of the optical disk.

The optical pickup 2 is supported by a main shaft 3 and a sub shaft 4 which are information reading means supports. The main shaft 3 and the sub shaft 4 are attached to the frame 18. Here, the main axis 3 This is the axis that regulates the movement direction and inclination of backup. The optical pickup 2 has a first bearing portion 10 and a second bearing portion 10 that are support portions on the optical pickup side, and the main shaft 3 is

1 2

It penetrates these interiors. Further, the optical pickup 2 is formed with a sub bearing portion 11 that engages with the sub shaft 4. With such a configuration, the optical pickup 2 has the first bearing portion 10

1

The optical disk is supported by the main shaft 3 and the sub shaft 4 at the three points of the second bearing portion 10 and the sub bearing portion 11.

2

Move in the radial direction.

The first bearing portion 10 and the second bearing portion 10 are fitted to the main shaft 3 and slide. For this reason, the first bearing

1 2

Sliding bearings are provided inside the part 10 and the second bearing part 10 to reduce friction with the main shaft 3.

1 2

Decrease. The optical pickup 2 is moved in the radial direction of the optical disk by a feed motor 6 which is information reading means driving means. A feed screw 5 is attached to the output shaft of the feed motor 6, and a claw 7 provided on the optical pickup 2 is aligned with a screw groove formed on the outer periphery of the feed screw 5. As a result, when the feed motor 6 is driven, the optical pickup 2 moves outward or inward in the radial direction of the optical disk.

The main shaft 3 and the sub shaft 4 that support the optical pickup 2 are fixedly supported by the frame 18. The main shaft 3 has a first support end 3t and a second support end 3t connected to the first fixing screw 9 and the second fixing screw 9.

1 2 1 2 Therefore, it is attached by being fixed to the frame 18. In addition, a lubricant such as oil is applied to the main shaft 3, and a sliding shaft provided inside the first bearing portion 10 and the second bearing portion 10.

1 2

Reduce friction with the receiver.

As shown in FIG. 3, the optical disk 19 is rotated about the rotation center axis Zr by the electric motor 8. The optical pickup 2 moves in the scanning direction S, reads information from the optical disc 19, and records information on the optical disc 19. At this time, the position of the lens in the focal direction F is controlled by a lens moving device, which will be described later, so that the focal distance between the lens of the optical pickup 2 and the information recording surface of the optical disc 19 is constant. Here, the scanning direction S is a direction parallel to the radial direction of the optical disc 19, and the focal direction F is a direction orthogonal to the disc surface of the optical disc 19.

As shown in FIG. 4, the optical system 2L is stored in an optical system case 2C. The optical system includes a rising mirror 12, a synthesis prism 13, a half mirror 14, a lens 15, a first condensing lens 16a, a second condensing lens 16b, a light receiving element 17 as a reading means, and a semiconductor laser as a light source. Ichizaichi (and less than _LD, U) diode ₂₀ a, and a 20b! /, Ru. Further, a temperature sensor 21 for measuring the ambient temperature of the LD 20a, 20b is provided in the optical system case 2C. Here, the lens 15 is supported by the lens moving device 40 according to this embodiment.

The laser beams emitted from the two LDs 20a and 20b are combined by the combining prism 13 and then reflected by the half mirror 14. Then, the light is reflected by the rising mirror 12 through the first condensing lens 16a, then condensed by the lens 15 disposed at a position facing the rising mirror 12, and irradiated onto the recording surface of the optical disc. This laser light is reflected by the recording surface of the optical disk, and is guided to the light receiving element 17 through the lens 15, the rising mirror 12, the first condenser lens 16a, the half mirror 14, and the second condenser lens 16b.

FIG. 5 is an explanatory diagram illustrating a modification example of the lens moving actuator provided in the lens moving device according to the first embodiment. This lens moving device 40 includes focal point direction adjustment coils (hereinafter referred to as focus coils) 300 and 301 that adjust the position of the lens 15 in the focal direction F to a lens holder 50 that is a lens support that supports the lens 15. Provided. Here, the focus coil 30 O provided outside the lens 15 in the scanning direction is referred to as an outer focus coil 30 Ot, and the focus coil 301 provided inside the lens 15 in the scanning direction is referred to as an inner focus coil 301.

In this lens moving device 40, the magnetic force generated by the outer focus coil 30O is made larger than the magnetic force generated by the inner focus coil 301. Here, the inner focus coil 301 corresponds to the first focus direction position adjusting means, and the outer focus coil 30O corresponds to the second focus direction position adjusting means.

In the lens moving device 40 shown in FIG. 5, the dimension L2 of the outer focus coil 30O in the direction orthogonal to the focal direction of the lens 15 is set to the dimension of the inner focus coil 301 in the direction orthogonal to the focal direction of the lens 15. It is larger than L1. As a result, the magnitude of the magnetic force in the focal direction of the lens 15 is larger in the outer focus coil 30O than in the inner focus coil 301.

[0033] Note that even if the number of turns of the outer focus coil 30O is larger than the number of turns of the inner focus coil 301, the magnetic force generated by the outer focus coil 30O may be larger than the magnetic force generated by the inner focus coil 301. Good. The L2 and the L1 are the same size, and the outside By making the inner width 12 of the side focus coil 30O smaller than the inner width 11 of the inner focus coil 301, the magnetic force generated by the outer focus coil 30O is made larger than the magnetic force generated by the inner focus coil 301. Also good.

FIGS. 6A and 6B are explanatory diagrams illustrating the operation of the lens moving device according to this embodiment. In the lens moving device 40 according to this embodiment, the magnetic force generated by the outer focus coil 30O is larger than the magnetic force generated by the inner focus coil 301. For this reason, when the lens 15 is moved in the focal direction F by the outer and inner focus coils 300, 301, the lens moving device 40 has a larger movement amount on the outer side in the radial direction of the optical disc 19 than on the inner side in the radial direction. Become.

Accordingly, when the optical disc 19 is warped as shown in FIG. 6A, when the lens moving device 40 moves in a direction approaching the optical disc 19, the lens moving device 40 moves in the scanning direction. Outer O tilts toward the optical disc 19 side. As a result, the lens 15 can follow the warp of the optical disc 19. Further, as shown in FIG. 6B, when the optical disc 19 is warped in the opposite direction to the example shown in FIG. 6-1, when the lens moving device 40 moves away from the optical disc 19, The moving device 40 is inclined in a direction in which the outer side O in the scanning direction is separated from the optical disc 19. As a result, the lens 15 can follow the warp of the optical disk 19. Next, a second embodiment will be described. In the following examples, the configuration of Example 1 can be applied as appropriate.

Example 2

FIG. 7-1 to FIG. 7-3 are explanatory diagrams illustrating the configuration of the lens moving device according to the second embodiment.

8A and 8B are explanatory diagrams illustrating the operation of the lens moving device according to the second embodiment. The lens moving device 40a according to this embodiment includes a lens holder 50, an actuator substrate 51 attached to the lens holder 50, and a support spring 53 attached to the lens holder 50. Consists of. The lens 15 is supported by a lens holder 50 provided in the lens moving device 40a according to this embodiment.

[0037] The lens holder 50 corresponding to the lens support body includes a main body 50B that supports the lens 15, and a support arm 50A provided on the main body 50B. In this embodiment, the support arm 50A is formed integrally with the main body 50B. A spring 53 is provided on the support arm 50A. It is attached. One end of the spring 53 is fixed to the support arm 50A, and the other end of the spring 53 is fixed to the optical pickup 2. As a result, the lens holder 50 is supported by the optical pickup 2 via the spring 53. The lens holder 50 is configured to be able to swing around the portion where the spring 53 is fixed to the optical pickup 2 (see FIGS. 7-1 and 7-2).

[0038] The first and second side surfaces 50S and 50S of the lens holder 50 are respectively provided with an actuator base.

1 2

A plate 51 is attached. The lens holder 50 is sandwiched between the two actuator substrates 51. Here, the first and second side surfaces 50S, 50S of the lens holder 50 are

This is a side surface parallel to the focal direction F of the lens 2 and parallel to the scanning direction S of the lens 15.

As shown in FIG. 7-3, an actuator board 51 corresponding to the board includes a focus direction position adjustment coil (hereinafter referred to as a focus coil) 30 that adjusts the position of the lens 15 in the focal point direction F, and a lens. A position adjustment coil (hereinafter referred to as a tracking coil) 31 for adjusting the position of 15 in the scanning direction S is formed to constitute a lens moving actuator 41. Thus, the lens moving actuator 41 according to this embodiment is a so-called printed coil formed on the actuator substrate 51 which is a print substrate. Here, the focus coil 30 corresponds to a focus direction position adjusting unit.

[0040] When the focus drive current If flows through the focus coil 30, the focus coil 30 generates a magnetic field and moves the lens 15 together with the lens holder 50 in the focal direction F (in this example, the direction of the arrow F).

1

) (Fig. 8-1). As a result, the distance (focal length) between the lens 15 and the optical disk 19 is controlled. When the tracking drive current It flows through the tracking coil 31, the tracking coil 31 generates a magnetic field and moves the lens 15 together with the lens holder 50 in the scanning direction S (in this example, the arrow S direction) (Fig. 8-2). ). As a result, the scanning direction of the lens 15

1

Control position in S.

As shown in FIG. 7-3, on the actuator substrate 51, two tracking coils 31 are arranged side by side in the scanning direction S of the lens 15. On the actuator substrate 51, two focus coils 30 are arranged on the inner side I in the scanning direction and the outer side O in the scanning direction of the lens 15. In this way, the two tracking coils 31 are arranged on the actuator substrate 51 so as to be sandwiched between the two focus coils 30. In this example, Thus, the end 30t of the focus coil 30 on the lens 15 side is disposed at a position farther from the lens 15 than the end 31t of the tracking coil 31 on the lens 15 side. Here, the inner side I of the lens 15 in the scanning direction is the rotation center axis Zr side of the optical disk 19 rotated by the electric motor 8 which is an optical disk driving means provided in the disk device 1, and the inner side I of the lens 15 in the scanning direction is The outside of the optical disc 19 in the radial direction.

As described above, in the lens moving device 40a according to this embodiment, the two focus coils 30 and the two tracking coils 31 are disposed on the actuator substrate 51 in a substantially gate shape. The shape of the actuator substrate 51 is also substantially gate-shaped. Accordingly, the lens moving device 40a can keep the size in the focal direction F small. Further, the laser light can be passed through the opening 51ο of the actuator substrate 51, which contributes to space saving.

FIGS. 9-1 and 9-2 are side views showing a state where the actuator substrate is bonded to the lens holder. In addition, it is the partial force adhesion part shown by hatching in Fig. 9-1 and Fig. 92. As shown in FIGS. 9-1 and 9-2, in the lens moving device 40a according to this embodiment, the two actuator substrates 51 are bonded to the first and second side surfaces 50S and 50S of the lens holder 50.

1 2 is fixed.

[0044] At this time, as shown in FIGS. 9-1 and 9-2, the lens moving device 40a according to the present embodiment! Thus, at least one of the portions 51f where the focus coil 30 is provided on the actuator substrate 51 (focus coil forming portion) 51f is not in contact with the lens holder 50. In this embodiment, the portion (tracking coil forming portion) 5 It provided on the actuator substrate 51 where the tracking coil 31 is provided is bonded to the main body portion 50 B of the lens holder 50.

[0045] The focus coil forming portion 5 If of the actuator substrate 51 is disposed outside the main body 50B of the lens holder 50, and between the focus coil forming portion 5 If and the support arm 50A of the lens holder 50. Provide a gap t (see Fig. 7-1). In this embodiment, the focus coil forming portion 51f of one of the actuator substrates 51 and the support arm 50A far from the lens 15 are bonded (FIG. 91), but the other actuator substrate 5 The focus coil forming portion 51f of 1 and the lens holder 50 are not in contact, that is, not bonded (FIG. 92). The heat generation amount of the focus coil 30 is larger than that of the tracking coil 31. This is due to the following reasons. The focus coil 30 supports the weight of the lens moving actuator 41, the lens 15 and the like, and also changes the focal length depending on the type of the optical disc 19 and causes the lens to follow the surface shake of the optical disc 19, etc. Compared to the tracking coil 31, it is necessary to pass more current. As a result, the heat generation amount of the focus coil 30 is larger than that of the tracking coil 31.

[0047] In the lens moving device 40a according to this embodiment, the area where the focus coil forming portion 5 If and the lens holder 50 are in contact with each other can be reduced by the above configuration. The heat transmitted to can be reduced. Further, by arranging the focus coil 30 on the inner side I in the scanning direction and the outer side O in the scanning direction of the lens 15, the heat generated in the focus coil 30 can be efficiently radiated into the air. Further, by disposing the focus coil 30 on the inner side I and the outer side O in the scanning direction of the lens 15, the distance between the focusing coil 30 and the lens holder 50 can be secured. The amount of heat transfer to the lens holder 50 can be suppressed. Due to these actions, the amount of heat transfer from the focus coil 30 to the lens holder 50 can be suppressed, so that a decrease in durability of the lens 15 can be suppressed.

[0048] In particular, when the disk device 1 is mounted on a vehicle, it is used in a high temperature environment. Therefore, the force that will be used in a state where the margin of the heat-resistant temperature of the lens 15 is reduced. If the lens moving device 40a according to this embodiment is used, the temperature rise of the lens 15 can be suppressed. The margin can be increased. In order to improve the reading speed and recording speed of the optical disk 19, the force required to rotate the optical disk 19 at a high speed increases the surface vibration acceleration of the optical disk 19 accordingly. In order to cause the lens 15 to follow this surface vibration, a larger amount of current flows through the focus coil 30, so that the heat generation amount of the focus coil 30 also increases. If the lens moving device 40a according to this embodiment is used, the temperature increase of the lens 15 can be suppressed. Therefore, the optical disk 19 is rotated at a high speed by the amount of the temperature increase, and the reading speed and recording speed of the optical disk 19 are increased. Can be improved.

[0049] FIG. 10 is an explanatory diagram showing a change in temperature of the lens with time when a current is passed through the focus coil or tracking coil in the lens moving device according to this embodiment. is there. The ambient temperature is 25 ° C. In the lens moving device 40a according to this embodiment, as described above, the focus coil forming portion 51f of one of the actuator substrates 51 and the support arm 50A of the lens holder 50 are bonded. In this case, about 20% of the heat generation area (plan view) of all four focus coils 30 included in the lens moving device 100 is in contact with the support arm 50A of the lens holder 50.

[0050] As can be seen from FIG. 10, the focus coil 30 generates more heat than the tracking coil 31, but the focus coil 30 is energized only when the focus coil 30 is energized more than when only the tracking coil 31 is energized. The temperature T of the lens 15 is about 10 ° C lower. Thus, it was confirmed that in the lens moving device 40a according to this example, the temperature increase of the lens 15 due to the heat generation of the focus coil 30 can be suppressed. If the area of the four focus coils 30 provided in the lens moving device 100 is in contact with the support arm 50A etc. of the lens holder 50 is 50% or less, the lens 15 is practically used. The effect of suppressing the temperature rise is obtained.

Industrial applicability

[0051] As described above, the lens moving device and the disk device according to the present invention are useful for recording and reproduction with respect to an optical disk, and in particular, have lens followability with respect to warpage, surface deflection, and the like of the optical disk. Suitable for

Claims

The scope of the claims

[1] a lens support (104) that supports a lens (103) that irradiates the recording medium (105) with light from the light source (20a, 20b);

The lens support (104) is provided on the inner side in the running direction of the lens (103) with respect to the recording medium (105), and adjusts the position of the lens (103) in the focal direction by magnetic force. A focal direction position adjusting means (101);

The lens support (104) is provided on the outer side in the running direction of the lens (103) with respect to the recording medium (105), adjusts the position of the lens (103) in the focal direction by magnetic force, and Second focus direction position adjusting means (102) that generates a magnetic force larger than the first focus direction position adjusting means (101);

A lens moving device.

[2] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

(102) is a coil,

2. The lens moving device according to claim 1, wherein the number of turns of the second focal direction position adjusting means (102) is larger than the number of turns of the first focal direction position adjusting means (101). .

[3] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

(102) is a coil,

The magnetic force generation width of the second focal position adjustment means (102) in the scanning direction of the lens (103) with respect to the recording medium (105) is the scanning of the lens (103) with respect to the recording medium (105). 3. The lens moving device according to claim 1, wherein the lens moving device is larger than a magnetic force generation width of the first focal direction position adjusting means in a direction.

[4] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

3. The lens moving device according to claim 1, wherein (102) is formed on a surface of a substrate (51) provided on the lens support (104).

[5] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

(102) is a coil,

The second focus in the scanning direction of the lens (103) with respect to the recording medium (105). The magnetic force generation width of the point direction position adjusting means (102) is larger than the magnetic force generation width of the first focal direction position adjusting means (101) in the scanning direction of the lens (103) with respect to the recording medium (105). Big

The first focal direction position adjusting means (101) and the second focal direction position adjusting means (102) are formed on the surface of a substrate (51) provided on the lens support (104). The lens moving device according to claim 1 or 2.

[6] Optical disc drive means (8) for rotating the optical disc (19);

A light source (20a, 20b) for irradiating the optical disc (19) with light;

A lens support (104) for supporting a lens (103) for irradiating light from a light source (20a, 20b) to a recording medium (105), and the lens support (104) with respect to the recording medium (105) A first focal direction position adjusting means (101) provided inside the scanning direction of the lens (103) for adjusting the focal position of the lens (103) by a magnetic force; and the lens support (104) The lens (103) is arranged on the outer side in the scanning direction of the recording medium (105), adjusts the position of the lens (103) in the focal direction by magnetic force, and the first focal direction position adjusting means. A lens moving device (40; 40a; 100) comprising: a second focal direction position adjusting means (102) that generates a magnetic force larger than (101);

A disk device comprising:

[7] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

(102) is a coil,

7. The disk device according to claim 6, wherein the number of turns of the second focus direction position adjusting means (102) is larger than the number of turns of the first focus direction position adjusting means (101).

[8] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

(102) is a coil,

The magnetic force generation width of the second focal position adjustment means (102) in the scanning direction of the lens (103) with respect to the recording medium (105) is the scanning of the lens (103) with respect to the recording medium (105). 8. The disk device according to claim 6, wherein the first magnetic direction position adjusting means (101) in the direction is larger than a magnetic force generation width of the first focal direction position adjusting means (101). [9] The first focal direction position adjusting means (101) and the second focal direction position adjusting means (102) are formed on the surface of the substrate (51) provided on the lens support (104). 8. The disk device according to claim 6 or 7, wherein:

[10] The first focal direction position adjusting means (101) and the second focal direction position adjusting means

(102) is a coil,

The magnetic force generation width of the second focal position adjustment means (102) in the scanning direction of the lens (103) with respect to the recording medium (105) is the scanning of the lens (103) with respect to the recording medium (105). Larger than the magnetic force generation width of the first focus direction position adjusting means (101)

The first focal direction position adjusting means (101) and the second focal direction position adjusting means (102) are formed on the surface of a substrate (51) provided on the lens support (104). The disk device according to claim 6 or 7.