JP2005285240A - Pickup actuator, pickup device, recording medium driving device, and method for manufacturing pickup actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pickup actuator capable of executing accurate control by preventing the resonance of a lens holder even when a disk recording medium is rotated at a high speed, a pickup device, a recording medium driving device, and a method for manufacturing the pickup actuator. <P>SOLUTION: This actuator is provided with a suspension base 500, a lens holder disposed to hold an objective lens and to move in focusing and tracing directions along the optical axis of the objective lens, and six suspensions 550A to 550F whose ends are connected to the suspension base 500 and the lens holder. A segment connecting the four connected parts of the suspensions 550A to 550F is formed into a rectangular shape, and the remaining two connected parts area arranged inside the rectangular shape. As the displacement of the suspensions 550A, 550B, 550D and 550E is larger than that of the suspensions 550C and 550F, large relative displacement occurs in an axial direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pickup actuator, a pickup device, a recording medium driving device, and a method of manufacturing a pickup actuator.

Conventionally, a pickup actuator is used as a mechanism for recording and / or reproducing a disk-shaped optical recording medium. There are various types of pickup actuators. In recent years, research on pickup actuators having a configuration capable of recording and / or reproducing optical recording media at higher speeds among the pickup actuators is underway.
As an example of such a pickup actuator, a lens holder that supports an objective lens, a magnet, and the like, a plurality of drive coils for driving the lens holder, a base, and between the lens holder and the base There are four linear elastic members having both ends connected to each other, and a lens holder is supported so as to be swingable in a focus direction and a tracking direction (for example, Patent Document 1). Such a pickup actuator includes six or more linear elastic members (Patent Document 2).

  Thus, in the pickup actuator having six linear elastic members, the six linear elastic members are parallel to each other, and the line segment connecting the base side connection portions and the connection portions on the lens holder side are connected to each other. Each of the line segments connecting to each other forms a rectangle.

Japanese Patent Laid-Open No. 2001-229555 (FIGS. 15 and 16) JP-A-8-273179 (paragraph number “0031”)

When the optical recording medium is rotated, the pickup actuator operates so that the lens holder follows the surface deflection and eccentricity of the recording medium.
Here, in order to prevent the lens holder from resonating when the pickup actuator is operated, the rolling frequency when the lens holder rotates (rolls) with respect to the base is usually set higher than the vibration frequency of the lens holder. ing.

However, when the recording medium is rotated at a high speed, the surface shake and eccentricity of the recording medium become severe, and the vibration frequency of the lens holder that follows the surface shake increases. On the other hand, the rolling frequency is uniquely determined by the shape of the connecting portion between the lens holder and the linear elastic member, and is not affected by the rotational speed of the recording medium.
For this reason, when the vibration frequency of the lens holder increases with the high-speed rotation of the recording medium, there is a possibility that it matches the rolling frequency. If the vibration frequency matches the rolling frequency, the lens holder resonates, and the pickup actuator cannot be controlled accurately.

  The present invention provides a pickup actuator, a pickup device, a recording medium driving device, and a method for manufacturing the pickup actuator that can perform accurate control by preventing resonance of a lens holder even when a disk-like recording medium is rotated at high speed. One purpose is to do.

  The invention described in claim 1 holds a fixed portion and an objective lens that can be opposed to a disk-shaped recording medium, and has a focus direction along the optical axis of the objective lens and a tracking direction substantially orthogonal to the focus direction. A plurality of linear elastic members, each having a movable part that is movable, and five or more linear elastic members each having an end connected to the movable part and the fixed part; In at least one of the connection part on the fixed part side and the connection part on the movable part side, a line segment that connects some of the connection parts is a rectangular shape, and the remaining connection parts are inside the rectangular shape. Pickup actuator characterized by being arranged in

  According to a fifth aspect of the present invention, there is provided a pickup apparatus comprising the pickup actuator according to any one of the first to fourth aspects, and an actuator driving unit that drives the pickup actuator.

  According to a sixth aspect of the present invention, there is provided a recording medium driving device comprising the pickup device according to the fifth aspect.

  The invention described in claim 7 holds the fixed portion and the objective lens that can be opposed to the disc-shaped recording medium, and has a focus direction along the optical axis of the objective lens and a tracking direction substantially orthogonal to the focus direction. A method of manufacturing a pickup actuator comprising a movable part that is movable respectively, and five or more linear elastic members each having an end connected to the movable part and the fixed part. In addition, at least one of the connection portion on the fixed portion side and the connection portion on the movable portion side of the plurality of linear elastic members, a line segment that connects some of the connection portions is rectangular. And a step of arranging the linear elastic member so that the remaining connecting portions are located inside the rectangular shape.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire pickup apparatus according to the first embodiment of the present invention. FIG. 2 is a plan view showing the entire pickup apparatus of the first embodiment.

[Configuration of pickup device]
1 and 2, reference numeral 1 denotes a pickup device. The pickup device 1 is a device that records and / or reproduces an optical recording medium such as an optical disc such as a CD, a DVD, or a Blu-ray. Accordingly, the pickup device 1 is incorporated in a drive device for recording and / or reproducing these optical recording media, for example.

The pickup device 1 includes a pickup body 200, an actuator base 300 fixed to the pickup body 200, and a pickup actuator 400 fixed to the actuator base 300.
The pickup actuator 400 includes a suspension base 500 as a fixed portion, a lens holder 600 as a movable portion, and six suspensions 550A to 550F as linear elastic members that connect the suspension base 500 and the lens holder 600. It has.

The actuator base 300 includes standing portions 310a and 310b that are parallel to each other, and a protruding portion 311 that protrudes toward the pickup body 200 is formed on the standing portions 310a and 310b.
The actuator base 300 is positioned by engaging the protrusion 311 with an M-shaped holding portion 210 formed on the pickup body 200. The actuator base 300 is inserted into a support post 201 with one end fixed to the pickup body 200, and the other end is fixed with a fixing screw 202.

  The pickup actuator 400 is positioned between the standing portions 310 a and 310 b by engaging the V-shaped groove 509 formed in the suspension base 500 and the M-shaped protruding plate 301 formed in the actuator base 300. The pickup actuator 400 is fixed to the actuator base 300 by screwing the suspension base 500 to the actuator base 300.

  In addition, a stopper member 320 is provided on the standing portions 310a and 310b. The stopper member 320 is a linear member that is bent into a substantially U shape as a whole. A stopper member (not shown) that protrudes to the inner side of the standing portions 310a and 310b, that is, the lens holder 600 side, is provided at the tip of the stopper member 320. The stopper member 320 is attached by inserting the stop portion into an insertion hole (not shown) provided in the standing portions 310a and 310b. The stopper member 320 limits the stroke (movable range) of the lens holder 600 in the focus direction F and the tracking direction T. As a result, when the focus servo or tracking servo malfunctions, the lens holder 600 moves and collides with the pickup body 200 or other members, damaging the lens holder 600 itself or members mounted on the lens holder 600. Is prevented.

  A laser light source (not shown) is attached to the end of the actuator base 300. Laser light emitted from the laser light source passes under an objective lens 620 (to be described later) through an optical path constituted by an optical system arranged in the actuator base 300. A raising mirror (not shown) is disposed below the objective lens 620, and the laser beam is routed upward by the raising mirror and passes through the objective lens 620 from the bottom to the top. An optical disk (not shown) is disposed above the objective lens 620, and the objective lens 620 focuses the laser beam on the information recording surface of the optical disk.

The suspensions 550A to 550F connect the suspension base 500 and the lens holder 600. As a material for the suspensions 550A to 550F, it is preferable to use a material having high strength that can withstand strong bending stress as a spring material and excellent in fatigue resistance against repeated action, such as beryllium copper. In addition, not only beryllium copper but other materials such as phosphor bronze alloy having high strength and fatigue resistance may be used as an alternative material.
Flat plate portions 560A to 560F to be inserted into the suspension base 500 and the lens holder 600 are provided at the front ends of the suspensions 550A to 550F.

The suspension base 500 is formed by insert molding in which the flat plate portions 560A to 560F at the tips of the suspensions 550A to 550F are placed in a mold and a synthetic resin is injected.
Concave suspension insertion portions 520 are formed at four corners of the suspension base 500. Suspension insertion portions 520 are inserted with suspensions 550A to 550F, and flat plate portions 560A to 560F provided at the front ends of the suspensions 550A to 550F are attached so as to penetrate from the suspension insertion portion facing surface to the back side.

A V-shaped groove 509 is formed on the back surface of the suspension base 500. The V-shaped groove 509 engages with an M-shaped protruding plate 301 formed on the actuator base 300 to position the suspension base 500 on the actuator base 300.
Two suspension holes 530 are formed on the upper surface of the suspension base 500 so as to penetrate the lower surface. The pickup actuator 400 is fixed to the actuator base 300 by inserting a spring screw and a fixing screw (not shown) into the mounting hole 530.

  The lens holder 600 is swingably connected to the suspension base 500 by six suspensions 550A to 550F. The lens holder 600 is a substantially square member having a hollow structure formed of a synthetic resin. The lens holder 600 is a suspension formed by insert molding in which a flat plate portion 560 of the suspensions 550A to 550F is installed in a mold and a synthetic resin is injected. It is formed simultaneously with the base 500. A pair of support arms 630 are provided at both ends in the tracking direction T of the lens holder 600, and the ends of the suspensions 550A to 550F are fixed to the support arms 630.

Coil substrates 610 </ b> A and 610 </ b> B are attached to both side surfaces of the lens holder 600, and an objective lens 620 is attached to the approximate center of the upper surface of the lens holder 600.
Magnets 340A and 340B are fixed to actuator base 300 so as to face a pair of coil substrates 610A and 610B attached to lens holder 600, respectively. Here, the actuator drive unit of the present embodiment is configured by the coil substrates 610A and 610B and the magnets 340A and 340B.

The pair of magnets 340A and 340B are fixed at positions facing each other, and a magnetic field is formed in a space between them according to the magnetization pattern of the magnets 340A and 340B.
The lens holder 600 to which the coil substrates 610A and 610B are attached to the side surfaces is disposed in a magnetic field formed by the pair of magnets 340A and 340B. Therefore, when a drive current having a frequency of a predetermined servo band (for example, 0 to 5 kHz) is applied to the focus coil and tracking coil formed on the coil substrates 610A and 610B, the force generated by the current and magnetic field in the coil The lens holder 600 moves together with the objective lens 620 in the focus direction F and the tracking direction T.

[Suspension mounting structure]
3 and 4 schematically show the attachment structure of the suspensions 550A to 550F. 3A is a schematic view of the attachment structure of the suspensions 550A to 550F as viewed from the tracking direction, and FIG. 3B is a schematic view of the attachment structure of the suspensions 550A to 550F as viewed from the focus direction (above). 4 is a schematic view of the attachment structure of the suspensions 550A to 550F as viewed from the suspension base 500 toward the lens holder 600. FIG.

3A and 3B, the six suspensions 550A to 550F are arranged in parallel to each other when viewed from both the tracking direction and the focus direction.
In FIG. 4, the connection portions of the six suspensions 550A to 550F on the suspension base 500 side and the lens holder 600 side are respectively located in a plane including both the focus direction and the tracking direction.

A line segment connecting the connection portions of the suspensions 550A, 550B, 550D, and 550E is formed in a rectangular shape, and the connection portions of the remaining suspensions 550C and 550F are located inside the rectangular shape.
A line segment connecting the connection part of the suspension 550A and the connection part of the suspension 550E and a line segment connecting the connection part of the suspension 550B and the connection part of the suspension 550D are parallel to each other and extend in parallel with the focus direction. . A line segment connecting the center points of these line segments passes through the center of the virtual circle X.
A line segment connecting the connection portion of the suspension 550A and the connection portion of the suspension 550B and a line segment connecting the connection portion of the suspension 550D and the connection portion of the suspension 550E are parallel to each other and extend in parallel to the tracking direction. .
A line segment connecting the connection portions of the suspensions 550C and 550F passes through the center of the virtual circle X and is parallel to the tracking direction. The dimensions of the suspension 550C and the suspension 550F from the center of the virtual circle X are L (L <M), respectively.

In the pickup actuator 400 having the above configuration, when the lens holder 600 is rotated by the angle θ with respect to the suspension base 500, the suspensions 550A, 550B, and 550D in which the connection portions are located on the virtual circle X among the suspensions 550A to 550F. , 550E, the displacement h generated at the time of rotation is h = M × tan θ, and the displacement h of the suspensions 550C, 550F in which the connecting portion is located inside the rectangular shape composed of these line segments is h = L × tan θ .
Here, since L <M, the displacements of the suspensions 550A, 550B, 550D, and 550E are larger than the displacements of the suspensions 550C and 550F (L × tan θ << M × tan θ). Will occur. This relative displacement increases in proportion to the ratio of L and M.

[Pickup Actuator Manufacturing Method]
In order to manufacture the pickup actuator 400, first, six suspensions 550A to 550F are arranged at predetermined positions of a mold (not shown) having a cavity for molding the suspension base 500 and the lens holder 600. Here, the six suspensions 550A to 550F are arranged in parallel to each other, the suspensions 550A, 550B, 550D, and 550E are positioned on a virtual circle, and the connection portions of the suspensions 550A, 550B, 550D, and 550E are connected to each other. The connection portions of the remaining suspensions 550C and 550F are positioned inside the shape.
Thereafter, the fluid synthetic resin is injected into the mold. Then, the pickup actuator 400 is insert-molded in a state where the suspensions 550A to 550F are connected between the suspension base 500 and the lens holder 600.

[Effects of pickup actuator]
(1) The pickup actuator 400 according to the first embodiment holds the suspension base 500 and the objective lens 620 and is movable in the focus direction and the tracking direction along the optical axis of the objective lens 620. 600, and six suspensions 550A to 550F each having an end connected to the suspension base 500 and the lens holder 600, and a line segment connecting the four connecting portions among the suspensions 550A to 550F is rectangular. The remaining two connecting portions are arranged inside the rectangular shape. Therefore, when the lens holder 600 is rotated by the angle θ with respect to the suspension base 500, the displacements of the suspensions 550A, 550B, 550D, and 550E are larger than the displacements of the suspensions 550C and 550F. As a result, the rolling frequency increases. Therefore, even when the disk-shaped recording medium is rotated at high speed, the lens holder 600 can be prevented from resonating and accurately controlled.

(2) Since the suspensions 550 </ b> A to 550 </ b> F are composed of six suspensions, the lens holder 600 can be stably moved by arranging them uniformly around the rotation center O.

(3) Since the pickup apparatus 1 of the first embodiment includes the pickup actuator 400 having the above-described configuration, and the coil substrates 610A and 610B and the magnets 340A and 340B that drive the pickup actuator 400, the above-described effects. It is possible to provide a pickup device 1 that can achieve the above.
(4) Since the recording medium driving device of the first embodiment includes the pickup device 1 having the above-described configuration, it is possible to provide a recording medium driving device that can achieve the above-described effects.

(5) In manufacturing the pickup actuator 400, six suspensions 550A to 550F are installed at predetermined positions in the mold, and insert molding is performed by injecting molten resin from the injection port of the mold. Since these members can be connected by the suspensions 550A to 550F simultaneously with the molding of the lens holder 600 and the lens holder 600, the pickup actuator 400 can be manufactured in a short time.

(6) Since the six suspensions 550A to 550F are parallel to each other, the suspensions 550A to 550F can be easily positioned on the suspension base 500 and the lens holder 600, and the pickup actuator 400 can be easily manufactured.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. The second embodiment differs from the first embodiment in the arrangement of the suspensions 550A to 550F, and the other configuration is the same as that of the first embodiment. Here, in the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[Suspension mounting structure]
5 and 6 schematically show the attachment structure of the suspensions 550A to 550F. FIG. 5A is a schematic view of the mounting structure of the suspensions 550A to 550F viewed from the tracking direction, and FIG. 5B is a schematic view of the mounting structure of the suspensions 550A to 550F viewed from the focus direction (upward). 6 is a schematic view of the attachment structure of the suspensions 550A to 550F as viewed from the lens holder 600 toward the suspension base 500. FIG.

In FIG. 5A, the suspension 550C is disposed so as to be orthogonal to the focus direction when viewed from the tracking direction, and the suspension 550B and the suspension 550D are disposed with the suspension 550C interposed therebetween.
The adjacent suspensions 550B and 550C are wider in the dimension between the connection parts 500B and 500C in the suspension base 500 than the dimension between the connection parts 600B and 600C in the lens holder 600, and the adjacent suspensions 550C and 550D are the suspension base 500. The dimension between the connection parts 500C and 500D is wider than the dimension between the connection parts 600C and 600D in the lens holder 600. The suspensions 550B and 550C are arranged in an approximately eight shape. That is, the suspensions 550B and 550D are arranged in an approximately eight shape.
Similarly, the adjacent suspensions 550A and 550F have a wider dimension between the connection portions 500A and 500F in the suspension base 500 than the dimension between the connection portions 600A and 600F in the lens holder 600, and the adjacent suspensions 550F and 550E are suspensions. The dimension between the connection parts 500F and 500E in the base 500 is made wider than the dimension between the connection parts 600F and 600E in the lens holder 600. The suspensions 550E and 550A are arranged in an approximately eight shape.

5B, in the suspensions 550A and 550B adjacent to each other when viewed from the focus direction, the dimension between the connection parts 500A and 500B in the suspension base 500 is wider than the dimension between the connection parts 600A and 600B in the lens holder 600. The suspensions 550A and 550B are arranged in an approximately eight shape.
Similarly, the suspensions 550D and 550E adjacent to each other as viewed from the focus direction have a dimension between the connection portions 500D and 500E on the suspension base 500 wider than the dimension between the connection portions 600D and 600E on the lens holder 600, and the suspension 550D. , 550E are arranged in an approximately eight-letter shape.
The suspensions 550C and 550F adjacent to each other when viewed from the focus direction have a dimension between the connection portions 500C and 500F at the suspension base 500 wider than a dimension between the connection portions 600C and 600F at the lens holder 600. It is arranged in an approximately eight-letter shape.

In FIG. 6, the connection portions 500A, 500B, 500D, and 500E on the suspension base 500 side of the suspensions 550A, 550B, 550D, and 550E are located on the virtual circle 500X. A line segment connecting these connection portions 500A, 500B, 500D, and 500E is rectangular, and the connection portions 500C and 500F of the remaining suspensions 550C and 550F are positioned inside the rectangle.
The connection portions 600A, 600B, 600D, and 600E of the suspensions 550A, 550B, 550D, and 550E on the lens holder 600 side are located on the virtual circle 600X. A line segment connecting these connection portions 600A, 600B, 600D, and 600E is rectangular, and the connection portions 600C and 600F of the remaining suspensions 550C and 550F are located inside the rectangle.
The centers of these two virtual circles 500X and 600X coincide with the rotation center O of the lens holder 600.
In the pickup actuator 400 having the above configuration, as in the first embodiment, when the lens holder 600 is rotated by the angle θ with respect to the suspension base 500, the displacements of the suspensions 550A, 550B, 550D, and 550E are the suspensions 550C and 550F. Therefore, a relative displacement occurs in the axial direction.

Therefore, in 2nd Embodiment, there can exist the following effect other than the effect similar to (1)-(5) of 1st Embodiment.
(7) The adjacent suspensions 550A to 550F viewed from both the focus direction and the tracking direction have the dimensions of the connection portions 500A to 500F at the suspension base 500 wider than the dimensions between the connection portions 600A to 600F at the lens holder 600. In other words, since the suspensions 550A to 550F are arranged in an eight-character shape, the lens holder 600 can be made small, so that the space of the apparatus can be saved.

[Modification of Embodiment]
Note that the recording medium driving device of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention.
For example, in the above embodiment, six suspensions 550A to 550F are used. However, in the present invention, the number of suspensions 550A to 550F is not limited as long as the number of suspensions 550A to 550F is five or more. There may be 7, 7, 8, or more.

  Further, in manufacturing the pickup actuator 400, the insert molding method is used. In the present invention, the suspension base 500 and the lens holder 600 are molded separately or simultaneously by the injection molding method, and then the suspension base 500 and the lens are formed. The suspensions 550A to 550F may be bonded to the holder 600, soldered, screwed, or the like.

  In each of the embodiments described above, the line segment connecting the four connecting portions of the six suspensions 550A to 550F is rectangular, and the remaining two are arranged inside the rectangular shape. It is possible that only one is disposed on the inner side of the suspension, and the remaining five may form a rectangular shape. Further, what shows the relationship of such connection portions is the suspension base side of the suspensions 550A to 550F. Or the lens holder side.

In the second embodiment, the suspensions 550A to 550F that are adjacent to each other when viewed from both the focus direction and the tracking direction have the dimensions of the connection portions 500A to 500F on the suspension base 500 between the connection portions 600A to 600F on the lens holder 600. In the present invention, the opposite is the case, that is, the dimensions of the connecting portions 500A to 500F in the suspension base 500 are made narrower than the dimensions between the connecting portions 600A to 600F in the lens holder 600. But you can.
Further, in each of the above embodiments, the connection portions of the suspensions 550A to 550F are located on a plane including the focus direction and the tracking direction. However, in the present invention, the connection portions of the suspensions 550A to 550F are offset, It is included even if it is not.
For example, as shown in FIG. 7, the line segment that connects the connection portions of the suspensions 550A to 550F with the lens holder 12 is not parallel to the plane of the coil substrate (not shown) attached to the lens holder 600. Similarly, the line segment connecting the connection portions of the suspensions 550A to 550F on the suspension base 500 is not parallel to the plane of the coil substrate.

[Effects of Embodiment]
In the pickup actuator 400 of the present embodiment, the suspension base 500 and the objective lens 620 that can be opposed to the disk-shaped recording medium are held, and are movable in the focus direction and the tracking direction along the optical axis of the objective lens 620. A plurality of suspensions 550A to 550F having ends connected to the suspension base 500 and the lens holder 600, respectively, and the suspension base side of the suspensions 550A to 550F. In at least one of the connection portion at the lens holder 600 and the connection portion at the lens holder 600 side, the line segment connecting some of the connection portions is rectangular, and the remaining connection portions are arranged inside the rectangular shape. . Therefore, when the lens holder 600 is rotated by the angle θ with respect to the suspension base 500, the displacements of the suspensions 550A, 550B, 550D, and 550E are larger than the displacements of the suspensions 550C and 550F. As a result, the rolling frequency increases. Therefore, even when the disk-shaped recording medium is rotated at high speed, the lens holder 600 can be prevented from resonating and accurately controlled.

1 is a perspective view showing an entire pickup apparatus according to a first embodiment of the present invention. The top view which shows the whole pickup apparatus. (A) The schematic diagram which looked at the attachment structure of the suspension from the tracking direction. (B) The schematic diagram which looked at the attachment structure of the suspension from the focus direction. The schematic diagram which looked at the attachment structure of the suspension toward the lens holder from the suspension base. The 2nd Embodiment of this invention is shown, (A) The schematic diagram which looked at the attachment structure of the suspension from the tracking direction. (B) The schematic diagram which looked at the attachment structure of the suspension from the focus direction. The schematic diagram which looked at the attachment structure of the suspension toward the suspension base from the lens holder. The schematic diagram which shows the modification of this invention and corresponds to FIG. 3 (B).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pickup apparatus 400 ... Pickup actuator 500 ... Suspension base (fixed part)
500A to 500F ... Connection portion 500X ... Virtual circles 550A to 550F ... Suspension (linear elastic member)
600 ... Lens holder (movable part)
600A-600F ... Connection part 600X ... Virtual circle X ... Virtual circle

Claims (8)

A fixed portion, and a movable portion that holds an objective lens that can face a disc-shaped recording medium and is movable in a focus direction along the optical axis of the objective lens and in a tracking direction that is substantially perpendicular to the focus direction; And five or more linear elastic members each having an end connected to the movable part and the fixed part,
At least one of the connection part on the fixed part side and the connection part on the movable part side of the plurality of linear elastic members has a rectangular line segment that connects some of the connection parts, and the rest A pickup actuator characterized in that a connecting portion is arranged inside the rectangular shape. The pickup actuator according to claim 1,
The pickup actuator, wherein the plurality of linear elastic members are parallel to each other. The pickup actuator according to claim 1,
The linear elastic members adjacent to each other when viewed from the focus direction are different in the dimension between the connection parts at the fixed part and the dimension between the connection parts at the movable part, and are adjacent to each other when viewed from the tracking direction. The shape-like elastic member is different in the dimension between the connection parts in the fixed part and the dimension between the connection parts in the movable part.
A pickup actuator characterized by that. In the pickup actuator according to any one of claims 1 to 3,
The pickup actuator characterized in that there are six linear elastic members. 5. A pickup apparatus comprising: the pickup actuator according to claim 1; and an actuator driving unit that drives the pickup actuator. A recording medium driving device comprising the pickup device according to claim 5. A fixed portion, and a movable portion that holds an objective lens that can face a disc-shaped recording medium and is movable in a focus direction along the optical axis of the objective lens and in a tracking direction that is substantially perpendicular to the focus direction; A method of manufacturing a pickup actuator comprising five or more linear elastic members each having an end connected to the movable part and the fixed part,
At least one of the connection part on the fixed part side and the connection part on the movable part side of the plurality of linear elastic members, the line segment connecting a part of the connection parts is rectangular, Arranging the linear elastic member so that the remaining connecting portion is located inside the rectangular shape;
A method for manufacturing a pickup actuator, comprising: In the manufacturing method of the actuator for pickups described in Claim 7,
A pickup characterized in that the linear elastic member is installed in a mold for molding the fixed portion and the movable portion, and a pickup actuator is insert-molded by injecting molten resin from an injection port of the mold. Method for manufacturing an actuator.

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