JP2001291253A - Optical storage device and its objective lens driving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical storage device equipped with an objective lens driving mechanism whose mechanical resonance frequency is sufficiently high. SOLUTION: The optical storage device is a device capable of reading out information recorded in an optical storage medium, the device includes a carriage movably loaded on a base in the radial direction of the optical storage medium, a first driving mechanism which has a first coil fixed to the carriage and a first magnetic circuit loaded on the base and which is for moving the carriage, an objective lens for focusing a light beam emitted from a light source on the optical storage medium, and a lens holder for holding the objective lens. The device also includes an elastic supporting member for movably supporting the lens holder against the carriage which has the first end fixed to the carriage and the second end fixed to the lens holder, and a second moving mechanism for moving in the focusing direction the objective lens which has the second coil fixed to the lens holder and the second magnetic circuit fixed to the carriage. A high rigidity reinforcing member is fixedly stuck to the carriage so as to connect between the first coil and the first end of the elastic supporting member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to an optical storage device, and more particularly, to an objective lens driving mechanism of the optical storage device.

2. Description of the Related Art An optical disk has been spotlighted as a core memory medium in the rapidly developing multimedia in recent years, and is usually used in a state housed in a cartridge case.

An optical disk cartridge is loaded into an optical disk device, and an optical pickup (optical head) is provided.
Reads / writes data to / from the optical disk.

[0004]

2. Description of the Related Art In order to realize a compact optical disk apparatus, a fixed optical assembly including a laser diode, a beam splitter for reflecting and transmitting a laser beam, a photodetector for receiving reflected light from an optical disk, and the like are used. , A carriage and a moving optical assembly including an objective lens, a supporting member thereof, and a focusing mechanism having a focusing coil attached to the carriage.

[0005] The objective lens is supported by a lens holder, and the lens holder is cantilevered by a carriage by two parallel leaf springs made of metal. A pair of focusing coils are fixed to the lens holder.

[0006] A pair of focusing magnetic circuits are mounted on the carriage so as to face a focusing coil fixed to the lens holder, and the focusing magnetic circuit supplies a magnetic flux to the focusing coil fixed to the lens holder to generate an electromagnetic force. The interaction generates a force in the optical axis direction of the objective lens to drive the objective lens.

The carriage is guided by a pair of guide rails and is movable in the radial direction of the optical disk. A pair of carriage drive coils are fixed to both side surfaces of the carriage.

A part of the carriage driving coil is inserted into a gap of a carriage driving magnetic circuit arranged on a base on both sides of the carriage, and when the carriage driving coil is energized, the carriage is driven in a radial direction of the optical disk by electromagnetic interaction. To generate a driving force.

With such a configuration, the focusing mechanism controls the focusing position of the objective lens so that the focal point of the objective lens always coincides with the recording surface of the optical disk that fluctuates.

Further, the objective lens is positioned on an arbitrary track on the optical disk by driving the carriage (seek control). Further, the position of the objective lens in the radial direction of the optical disk is determined by vibration of the spindle motor and eccentricity during chucking of the optical disk. Tracking control is performed such that the objective lens focal position always follows a fluctuating track.

A laser beam of write power emitted from a laser diode of the fixed optical assembly is collimated by a collimator lens, passes through a beam splitter, is reflected by a beam raising mirror, and is focused on an optical disk by an objective lens. Data is written to the optical disk.

On the other hand, reading of data is performed by irradiating the optical disk with a laser beam of read power. The reflected light from the optical disk is returned to the collimated beam by the objective lens, and then reflected by the beam splitter of the fixed optical assembly. The reflected light is detected by the photodetector and converted into an electric signal.

Recent optical discs are required to have a high recording density, and one means for achieving this is to reduce the track interval. In order to narrow the track interval, it is necessary to improve the accuracy of tracking control for causing the objective lens to follow the track.

FIG. 1 shows the result of measuring the frequency characteristic of the displacement (compliance) of the objective lens with respect to the driving force of the carriage driving coil of the conventional objective lens driving mechanism.
Compliance decreases in proportion to (1 / frequency) ² as the frequency increases.

As is apparent from FIG. 1, in the conventional objective lens driving mechanism, as shown by an arrow R, the compliance sharply increases at about 16 kHz. This is a result of the influence of mechanical resonance of the carriage including the focusing mechanism.

The frequency of this mechanical resonance is determined by the rigidity of the force transmission path from the driving force generating portion of the carriage driving coil to the objective lens to be positioned.

In a positioning servo system such as tracking control, the control performance is limited by the mechanical vibration characteristics between the driving force generator and the object to be positioned (objective lens). When the mechanical resonance frequency is low, the tracking control is performed. It is known that the accuracy of the slab cannot be increased.

[0018]

Therefore, in order to realize a high-density optical disc by increasing the accuracy of tracking control, it is necessary to improve the mechanical resonance frequency, that is, a force transmission path from the carriage driving force generator to the objective lens. It is necessary to increase the stiffness.

In order to realize high tracking control performance, it is not only necessary to simply increase the rigidity of the carriage, but the positioning direction between the driving point (driving force generating section) and the positioning point (objective lens), that is, the optical disk It is necessary to increase the coupling stiffness in the radial direction.

In the conventional carriage, the carriage main body is made of molded resin from the viewpoint of improving productivity, and the resin is also formed between the carriage drive coil and the fixed end of the objective lens support spring on the carriage side.

The rigidity of the resin is lower than that of a metal or the like, which is one of the reasons why the rigidity of the force transmission path from the carriage driving force generator to the objective lens is reduced.

Japanese Patent Application Laid-Open No. 3-273856 discloses a configuration in which a portion of the coil generating a force is reinforced with a metal plate or the like to improve the mechanical vibration characteristics of the carriage. However, as described above, simply increasing the stiffness of the driving force generating portion of the coil is not sufficient from the viewpoint of increasing the stiffness between the driving force generating portion and the objective lens which is a positioning point.

Japanese Patent Application Laid-Open No. 9-54960 discloses a configuration in which the rigidity of the carriage is enhanced by using the cover of the carriage as a coil reinforcing material. However, even in this conventional example, there is no mention of increasing the rigidity between the driving force generator and the objective lens which is a positioning point.

Therefore, this conventional example also merely increases the rigidity of the carriage, and is judged to be basically ineffective from the viewpoint of improving the positioning accuracy.

Accordingly, it is an object of the present invention to provide an objective lens driving mechanism of an optical storage device capable of achieving highly accurate focus positioning of an objective lens.

Still another object of the present invention is to provide an optical storage device capable of achieving high-precision focus positioning of an objective lens and realizing high-density recording and reproduction of information.

[0027]

According to the present invention, there is provided an optical storage device capable of reading at least information recorded on an optical storage medium, comprising: a base; mounted on the base so as to be able to reciprocate in a first direction. Driving means for moving the carriage, including a coil fixed to the carriage and a magnetic circuit mounted on the base; a light source mounted on the base; and a light beam emitted from the light source An objective lens for focusing on the optical storage medium; a lens holder for holding the objective lens; a first end fixed to the carriage and a second end fixed to the lens holder; An elastic support member that movably supports the lens holder; and a carriage that connects between the coil and the first end of the elastic support member. A reinforcing member of the constant is high stiffness; optical storage apparatus characterized by comprising a are provided.

Preferably, the carriage is formed of a mold resin, and the high-rigidity reinforcing member is formed of stainless steel. Preferably, the elastic support member is formed from a metallic leaf spring and is adhered to the carriage and the coil. An elastic support member is spot welded at a first end to the metallic leaf spring.

According to another aspect of the present invention, there is provided an objective lens driving mechanism for an optical storage device having a base, wherein the carriage is reciprocally mounted on the base in a first direction;
Driving means for moving the carriage, including a coil fixed to the carriage and a magnetic circuit mounted on the base; and a light beam emitted from a light source is focused on an optical storage medium loaded in the apparatus. An objective lens; a lens holder for holding the objective lens; a first end fixed to the carriage and a second end fixed to the lens holder, the lens holder being movable with respect to the carriage. An objective lens driving mechanism, comprising: an elastic support member for supporting; and a high-rigidity reinforcing member fixed to the carriage connecting between the coil and the one end of the elastic support member. Provided.

In the objective lens driving mechanism of the present invention, the rigidity of the force transmission path from the carriage driving force generating section to the objective lens can be increased by the high-rigidity reinforcing member fixed to the carriage. It is possible to realize high accuracy tracking control.

[0031]

FIG. 2 is an exploded perspective view of an optical disk device 2 according to an embodiment of the present invention. The optical disk device 2 includes a load / eject mechanism unit 4 and a read / write mechanism unit 6.

The load / eject mechanism unit 4 includes a chassis 8 having a bottom plate 8a and a pair of side plates 8b, and a cartridge holder 10 attached to the chassis 8 so as to be vertically movable with respect to the bottom plate 8a of the chassis 8. Contains.

The optical disk cartridge is moved by the arrow C with the cartridge holder 10 and the bottom plate 8a of the chassis 8.
An insertion port 12 for insertion from a direction is defined.

The cartridge holder 10 has a guide groove 14
Are formed. The guide groove 14 is formed obliquely inward from the end of the insertion opening 12 of the cartridge, and is bent from the middle to be parallel to the longitudinal direction of the cartridge holder 10.

A first slider 16 and a second slider 18 are slidably fitted in the guide groove 14. On one side of the cartridge holder 10, a first spring arm 20 and a second spring arm 22 are integrally formed with the cartridge holder 10 by a slit 23 formed continuously.

On the other hand, on the other side of the cartridge holder 10, a third spring arm 24 is formed integrally with the cartridge holder 10 by a slit 25. A bias magnetic field generator 26 is mounted on the cartridge holder 10.

On the bottom plate 8a of the chassis 8,
A cartridge identification sensor 28 for detecting the write-protection state of the cartridge and the type of the cartridge is attached.

An eject motor 32 for ejecting the optical disk cartridge inserted into the cartridge holder 10 is mounted on the bottom plate 8a on the side opposite to the insertion opening 12.

A mechanism for raising and lowering the cartridge holder 10 is provided between the chassis 8 and the cartridge holder 10. When the optical disk cartridge is completely inserted into the cartridge holder 10, the cartridge holder 10 is moved to the bottom plate of the chassis 8. The optical disk cartridge is moved in the direction 8a, and is pressed against the bottom plate 8a.

In this state, the shutter of the optical disk cartridge is opened, and the exposed optical disk is chucked by the spindle motor. This cartridge holder 1
Since the zero elevating mechanism is known, it will not be described further here.

The load / eject mechanism unit 4 includes:
A flexible printed wiring board (FPC) 30 is provided. The tip of the FPC 30 is branched into three,
The first FPC 30a is connected to the bias magnetic field generator 26, the second FPC 30b is connected to the eject motor 32, and the third FPC 30c is connected to the cartridge identification switch 28.

The read / write mechanism unit 6 includes a metallic base 34. The load / eject mechanism unit 4 is mounted on the base 34. A spindle motor 36 is fixed to the base 34.

The base 34 further includes a moving optical assembly 38, a fixed optical assembly 40, and the printed wiring board 4.
2 is mounted. The moving optical assembly 38 includes a carriage 44 on which an objective lens 46 is mounted.

On the printed wiring board 42, a connector 48 for connecting to a printed wiring board (not shown) mounted on the load / eject mechanism unit 4 is mounted.

Reference numeral 50 denotes an F for transmitting a signal to the spindle motor 36 and a signal to the moving optical assembly 38.
It is a PC. FIG. 3 shows the magneto-optical disk drive 2 shown in FIG.
FIG. 2 shows a plan view of a state in which is assembled.

Referring to FIG. 4, there is shown a perspective view of the objective lens driving mechanism according to the first embodiment of the present invention. A spindle motor 36 is mounted on a base 34 of the optical disk device.

When the optical disk cartridge is inserted into the apparatus as described above, the cartridge holder 10 is moved in the direction of the spindle motor 36 as shown by the arrow 37, and the optical disk 52 is chucked by the spindle motor 36.

A fixed optical assembly 40 having a laser diode 41 is mounted on the base 34. The moving optical assembly 38 includes a carriage 44 which is guided by a pair of guide rails 66 and 68 fixed to the base 34 and is movable in the radial direction of the optical disk 52.

The carriage 44 includes a carriage main body 54 formed of a mold resin. As shown in the sectional view of FIG.
55 for receiving the laser beam emitted from
And a beam raising mirror 64 mounted on the inclined surface 57 of the carriage body 54 for reflecting the laser beam in the direction of the objective lens 46.

A pair of magnetic circuits 75 are used as guide rails 66,
It is mounted on the base 34 in parallel with 68. Each magnetic circuit 75 includes yokes 70 and 72 mounted on the base 34 and a permanent magnet 74 fixed to the yoke 72 by bonding or the like.

A reinforcing member 58 made of, for example, stainless steel is adhered to an end of the carriage main body 54 opposite to the objective lens 46. As shown in FIG. 6, the reinforcing member 58 has a hole 59 for passing a laser beam and a pair of holes 61 into which a pair of guide rails 66 and 68 are inserted.

The reinforcing member 58 includes a pair of coil fixing portions 58a.
The carriage driving coil 56 is bonded to each coil fixing portion 58a. Reference numeral 56a denotes a driving force generator of the coil 56.

One end of a pair of parallel leaf springs 60 made of, for example, stainless steel is spot-welded to the reinforcing member 58. The other end of each leaf spring 60 is bonded to a lens holder 62 that holds the objective lens 46.

On the carriage body 54, a pair (only one is shown) of a focusing magnetic circuit 80 is mounted.
The focusing magnetic circuit 80 includes a yoke 76 bonded to the carriage body 54 and a permanent magnet 78 bonded to the yoke 76.

On the other hand, a pair of focusing coils (not shown) are bonded to the lens holder 62 so as to face each focusing magnetic circuit 80. A voice coil motor (VCM) is formed by the focusing magnetic circuit 80 and the focusing coil, and when the focusing coil is energized, the objective lens 46 is moved in the optical axis direction (focusing direction).

The focusing mechanism constituted by the focusing magnetic circuit 80 and the focusing coil focuses the focal position of the objective lens 46 so that the focal point of the objective lens 46 always coincides with the recording surface of the optical disk 52 which fluctuates. Control.

On the other hand, each carriage drive coil 56 is inserted into a gap between the yoke 70 of the magnetic circuit 75 and the permanent magnet 74. A voice coil motor (VCM) is formed by the magnetic circuit 75 and the coil 56.
When the carriage 44 is energized, the guide rail 6
The optical disk 52 is moved in the radial direction of the optical disk 52 while being guided by 6, 68.

The carriage 44 is moved in the radial direction of the optical disk 52 by the carriage driving mechanism composed of the magnetic circuit 75 and the coil 56 to position the objective lens 46 on an arbitrary track of the optical disk 52 (seek control). .

Further, the objective lens 46 is always used by the carriage driving mechanism for a track whose position changes in the radial direction of the optical disk 52 due to vibration of the spindle motor 36 or eccentricity during chucking of the optical disk 52.
The tracking control is performed such that the focal position follows.

The gist of the present invention is to provide a carriage structure that can increase the rigidity of a force transmission path from the carriage driving force generating section 56a to the objective lens 46.

In this embodiment, a reinforcing member 58 made of, for example, stainless steel is adhered to the carriage body 54, and a pair of carriage driving coils 5 is attached to the reinforcing member 58.
6 is adhered. Further, a pair of leaf springs 60 supporting the lens holder 62 are spot-welded to the reinforcing member 58.

Therefore, the rigidity between the carriage driving coil 56 and the fixed end of the leaf spring 60 can be increased. As a result, the mechanical resonance frequency of the carriage 44 can be increased, and high-accuracy tracking control can be performed.

FIG. 7 shows the result of measuring the frequency characteristic of the displacement (compliance) of the objective lens with respect to the driving force of the carriage driving coil in the first embodiment. In the conventional example shown by the dotted line, the resonance frequency which was around 16 kHz as shown by R2,
As shown by 1, the frequency rises to around 20 kHz, and the effect of providing the reinforcing member 58 can be confirmed.

FIG. 8A shows a modification of the reinforcing member used in the first embodiment. The reinforcing member 58A is connected to the force generating portion 56a of the carriage driving coil 56 by the reinforcing member 5A.
The coil fixing portion 58a 'of 8A extends.

Since the rigidity of the force generating portion 56a of the coil 56 can be increased as compared with the reinforcing member 58 shown in FIG. 6, the mechanical resonance frequency of the carriage 44 can be further improved.

On the other hand, when this reinforcing member 58A is employed,
The coil fixing portion 58a 'of the reinforcing member 58a is
Therefore, it is necessary to increase the gap length by the thickness of the reinforcing member 58A. As a result, the magnetic circuit 7
5 has a disadvantage that the magnetic flux density in the gap portion decreases and the driving force decreases for the same driving current.

FIG. 8B is a perspective view of an improved type of the reinforcing member of the first embodiment. Reinforcing member 5 with the carriage drive coil 56 and the fixed portion of leaf spring 60 as close as possible
8B. By bringing them closer to each other, the rigidity between the carriage drive coil 56 and the fixed end of the leaf spring 60 can be further increased.

However, generally, in such a configuration, since the carriage drive magnetic circuit 75 needs to be arranged close to the fixed optical assembly 40 side, the depth dimension of the apparatus may be increased.

Therefore, this modification can be made even in the case where the carriage driving coil 56 and the fixed end of the leaf spring 60 are made close to each other, as long as the apparatus depth falls within a predetermined value.

Referring to FIG. 9, there is shown a perspective view of an objective lens driving mechanism according to a second embodiment of the present invention. In this embodiment, the magnetic circuit configuration is such that the magnetic flux of the carriage drive magnetic circuit 85 flows in the optical axis direction of the objective lens 46 in the gap 87.

That is, each magnetic circuit 85 includes a yoke 84 fixed to the base 34, a yoke 86 mounted on the yoke 84, and a permanent magnet 88 bonded to the lower surface of the yoke 86.

A pair of coils 56 'is adhered to the side surface of the carriage body 54 of the carriage 44, and each coil 5'
6 'is inserted into the gap 87 of the magnetic circuit 85. A reinforcing member 90 made of, for example, stainless steel is adhered to the carriage body 54 and the coil 56 '.

As best shown in FIG. 10, the lower leaf spring 60 is spot-welded to the reinforcing member 90,
A metal spacer 92 is spot-welded to the leaf spring 60 below. Further, the upper leaf spring 60 is attached to the spacer 92.
Are spot welded. The other ends of the pair of parallel leaf springs 60 are bonded to a lens holder 62 '.

On the side surface of the lens holder 62 ′, a focusing magnetic circuit 80 attached to the carriage body 54.
A pair of focusing coils 82 (only one is shown) are adhered to each other.

In this embodiment, the entire focusing mechanism is mounted on the upper portion of the carriage body 54. Also in the present embodiment, the rigidity between the driving force generating portion of the carriage driving coil 56 'and the fixed end of the leaf spring 60 is enhanced by the reinforcing member 90, so that the mechanical resonance frequency of the carriage 44 can be increased. As a result, highly accurate tracking control becomes possible.

FIG. 11 shows a modification 90 'of the reinforcing member 90 shown in FIG. In the reinforcing member 90 ', a bent portion 94 is integrally formed, and the bent portion 94 also serves as the spacer 92 shown in FIG.

The lower leaf spring 60 is spot-welded to the lower surface of the bent portion 94 of the reinforcing member 90 ′, and the upper leaf spring 6
0 is spot-welded to the upper surface of the bent portion 94.

Referring to FIG. 12, there is shown a perspective view of a carriage 44 according to the third embodiment of the present invention. In the first and second embodiments described above, the leaf spring 60 is provided with the reinforcing member 58,
90.

However, when the reinforcing member 58 is made of a stainless steel plate or the like, there is a possibility that the parallelism between the pair of leaf springs 60 becomes insufficient due to poor accuracy of the joint surface of the leaf springs 60. As a result, there is a concern that the accuracy of supporting the lens holder 62 is reduced.

In such a case, as shown in FIG. 12, the leaf spring 60 is directly bonded to the carriage main body 54, and the reinforcing member 58 is bonded to the carriage main body 54 and the leaf spring 60.

Since the carriage main body 54 made of a molded resin can be manufactured with sufficiently high precision, the parallelism of the leaf spring 60 can be maintained at a sufficiently high level.
6, the rigidity between the driving force generating portion 56a and the fixed end of the leaf spring 60 can be increased at the same time.

The present invention includes the following supplementary notes.

(Supplementary Note 1) An optical storage device capable of reading at least information recorded on an optical storage medium, comprising: a base; a carriage mounted on the base so as to reciprocate in a first direction; Drive means for moving the carriage, including a fixed coil and a magnetic circuit mounted on the base; a light source mounted on the base; and a light beam emitted from the light source on the optical storage medium. An objective lens for focusing; a lens holder for holding the objective lens; a first end fixed to the carriage and a second end fixed to the lens holder;
An elastic supporting member that movably supports the lens holder with respect to the carriage; a high-rigidity reinforcing member fixed to the carriage that connects between the coil and the first end of the elastic supporting member; An optical storage device comprising:

(Supplementary Note 2) The optical storage device according to supplementary note 1, wherein the carriage is made of a mold resin, and the high-rigidity reinforcing member is made of stainless steel.

(Supplementary Note 3) The elastic support member is formed of a metal leaf spring, the reinforcing member is bonded to the carriage and the first coil, and the metal leaf spring is reinforced at the first end. 3. The optical storage device according to claim 2, wherein the optical storage device is welded to the member.

(Supplementary Note 4) The optical storage device according to Supplementary Note 1, wherein the elastic support member includes a pair of metal leaf springs arranged in parallel with each other.

(Supplementary Note 5) The coil and the magnetic circuit of the driving means are arranged so as to generate a magnetic flux in a direction perpendicular to the recording surface of the optical storage medium loaded in the apparatus, and the reinforcing member is The optical storage device according to claim 4, wherein the metallic parallel leaf spring is bonded to the carriage and the coil, and the metallic parallel leaf spring is fixed to the reinforcing member at the first end.

(Supplementary Note 6) An objective lens driving mechanism for an optical storage device having a base, comprising: a carriage mounted on the base so as to reciprocate in a first direction; a coil fixed to the carriage and the base fixed to the base. Driving means for moving the carriage, including a mounted magnetic circuit; an objective lens for focusing a light beam emitted from a light source on an optical storage medium loaded in the apparatus; and a lens for holding the objective lens A holder; an elastic support member having a first end fixed to the carriage and a second end fixed to the lens holder, movably supporting the lens holder with respect to the carriage; A high-rigidity reinforcing member fixed to the carriage connecting the first end of the elastic support member and the first end of the elastic support member. Dynamic mechanism.

(Supplementary note 7) The objective lens driving mechanism according to supplementary note 6, wherein the carriage is made of a mold resin, and the high-rigidity reinforcing member is made of stainless steel.

(Supplementary Note 8) The elastic support member is formed of a metallic leaf spring, the reinforcing member is bonded to the carriage and the coil, and the metallic leaf spring is attached to the reinforcing member at the first end. 8. The objective lens drive mechanism according to claim 7, wherein the objective lens drive mechanism is welded.

(Supplementary note 9) The objective lens driving mechanism according to supplementary note 6, wherein the elastic support member is composed of a pair of metal leaf springs arranged in parallel with each other.

(Supplementary Note 10) The coil and the magnetic circuit of the driving means are arranged so as to generate a magnetic flux in a direction perpendicular to the recording surface of the optical storage medium loaded in the apparatus, and the reinforcing member is The objective lens driving mechanism according to claim 9, wherein the metallic parallel leaf spring is adhered to the carriage and the coil, and the metallic parallel leaf spring is fixed to the reinforcing member at the first end.

[0093]

According to the present invention, as described in detail above, the driving force generator of the carriage driving coil and the fixed end of the leaf spring supporting the objective lens are connected by a highly rigid reinforcing member. It is possible to increase the mechanical resonance frequency, and as a result, there is an effect that a highly accurate tracking control can be achieved.

Further, since the mechanical resonance frequency of the carriage can be increased, it is possible to provide an optical storage device capable of high-density recording and having high reliability.

[Brief description of the drawings]

FIG. 1 is a graph showing a frequency characteristic of compliance in a conventional example.

FIG. 2 is an exploded perspective view of the optical disc device.

FIG. 3 is a plan view of the optical disc device.

FIG. 4 is a perspective view of the first embodiment of the present invention.

FIG. 5 is a sectional view of a carriage.

FIG. 6 is a perspective view of a reinforcing member according to the first embodiment.

FIG. 7 is a graph showing frequency characteristics of compliance according to the first embodiment.

FIG. 8A and FIG. 8B are diagrams showing modified examples of the reinforcing member.

FIG. 9 is a perspective view of a second embodiment of the present invention.

FIG. 10 is a perspective view of a reinforcing member according to a second embodiment.

FIG. 11 is a perspective view of a modification of a reinforcing member.

FIG. 12 is a perspective view of a third embodiment of the present invention.

[Explanation of symbols]

 34 Base 36 Spindle Motor 38 Moving Optical Assembly 40 Fixed Optical Assembly 41 Laser Diode 44 Carriage 46 Objective Lens 52 Optical Disk 54 Carriage Body 56 Carriage Driving Coil 58 Reinforcing Member 60 Leaf Spring 62 Lens Holder 75 Carriage Driving Magnetic Circuit 80 Focusing Magnetic Circuit 82 Focusing coil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D068 AA02 BB01 CC07 EE02 GG03 5D117 GG01 HH12 JJ03 JJ13 5D118 AA23 DC03 EA02 EA18 EB01 EB25 ED04 FA02 FA15 FA17 FB20 5D119 AA35 CA05 MA01 MA03

Claims (5)

[Claims] 1. An optical storage device capable of reading at least information recorded on an optical storage medium, comprising: a base; a carriage mounted on the base so as to reciprocate in a first direction; and fixed to the carriage. Drive means for moving the carriage, including a coil mounted and a magnetic circuit mounted on the base; a light source mounted on the base; and a light beam emitted from the light source focused on the optical storage medium. An objective lens; a lens holder for holding the objective lens; a first end fixed to the carriage and a second end fixed to the lens holder, the lens holder being movable with respect to the carriage. An elastic support member for supporting; a high-rigidity reinforcing member fixed to the carriage connecting between the coil and the first end of the elastic support member; Optical storage apparatus characterized by comprising. 2. The optical storage device according to claim 1, wherein said carriage is made of a mold resin, and said high-rigidity reinforcing member is made of stainless steel. 3. The optical storage device according to claim 1, wherein said elastic support member comprises a pair of metal leaf springs arranged in parallel with each other. 4. The coil and the magnetic circuit of the driving means are arranged so as to generate a magnetic flux in a direction perpendicular to a recording surface of the optical storage medium loaded in the apparatus, and the reinforcing member includes the carriage and the magnetic member. 4. The optical storage device according to claim 3, wherein the metal parallel leaf spring is adhered to the coil, and the metal parallel leaf spring is fixed to the reinforcing member at the first end. 5. An objective lens driving mechanism for an optical storage device having a base, comprising: a carriage mounted on the base so as to be able to reciprocate in a first direction; a coil fixed to the carriage and mounted on the base. Driving means for moving the carriage, including: a magnetic circuit; an objective lens for focusing a light beam emitted from a light source on an optical storage medium loaded in the apparatus; and a lens holder for holding the objective lens. ;
An elastic support member having a first end fixed to the carriage and a second end fixed to the lens holder, and movably supporting the lens holder with respect to the carriage;
A high-rigidity reinforcing member fixed to the carriage connecting the coil and the first end of the elastic support member.