JP2970533B2 - Optical information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording information using an optical recording medium such as an optical disk or a magneto-optical disk.
The present invention relates to an optical information recording / reproducing apparatus for performing reproduction or recording / reproducing / erasing, and more particularly to an optical information recording / reproducing apparatus capable of moving an optical head at high speed and accurately.

[0002]

2. Description of the Related Art Conventionally, as this type of optical information recording / reproducing apparatus, as shown in FIG. 16, a light source a such as a semiconductor laser and a diffused laser beam from this light source a are converted into parallel laser beams. A collimator lens b, a beam shaping prism c for converting the spot shape of the laser beam from an elliptical shape to a substantially circular shape, an incident laser beam incident on the optical recording medium d, and a reflected laser beam reflected from the optical recording medium d A beam splitter e that separates the laser beam from the linearly polarized laser beam passing through the beam splitter e into a circularly polarized beam.
A four-wavelength plate f, an objective lens g that converges the laser light passing through the movable quarter-wavelength plate f on a converging surface of an optical recording medium d, and a reflected laser separated by the beam splitter e It is known that a main part thereof is constituted by a cylindrical lens j for causing light to enter a four-division PIN photodiode h for obtaining a tracking error signal, a focusing error signal, and a reproduced RF signal.

In such an optical information recording / reproducing apparatus, information is spirally or concentrically recorded on the optical recording medium d, or an objective lens g or the like is used to reproduce the recorded information. The optical head incorporating the optical system is moved along the radial direction (that is, the track direction) of the optical recording medium d, and the optical head is moved in order to cope with surface deflection of the optical recording medium d. d
It is necessary to perform a moving operation in the vertical direction (that is, the focus direction), and a driving system as described below has been conventionally used.

[0004] First, as an example, FIG.
And a movable base K1 having a substantially H-shaped cross-section on which an optical head He incorporating a focus control drive coil p1 is mounted, and provided on the lower end surface of the movable base k1. A carriage k2 and a bearing k3 for movably supporting the movable table k1, and the movable table k1
And a pair of bobbins k4 and k5 mounted on both sides thereof and having a track control drive coil p2 wound thereon,
Magnetic yokes k6 and k7 inserted through the cylindrical portions of
Track control permanent magnets m1 to m4 provided on the upper and lower sides of each of the bobbins k4 and k5, and focus control permanent magnets m5 and m6 disposed over the length direction of the track control permanent magnets m1 to m4 These permanent magnets m1
The main part is constituted by a magnetic holder k8 holding m6, and the focus control is performed by moving the optical head He in the focus direction by the electromagnetic force accompanying the energization of the focus control drive coil p2. The movable table k is driven by the electromagnetic force accompanying the energization of the track control drive coil p2.
The track control is performed by moving the optical head He mounted on No. 1 in the direction of arrow A.

On the other hand, as another example, as shown in FIG. 19, an optical head He which is arranged near an optical recording medium d and floats by an air flow accompanying rotation of the optical recording medium d, and this optical head He The main part is constituted by a spring-like suspension n1 which is supported so as to be able to float, and a moving member n3 which holds the base end side of the spring-like suspension n1 and is operated by a driving device n2 to form an optical head. He controls the track by moving the He in the track direction, while performing the focus control using the floating phenomenon of the optical head He.

However, in the former optical recording apparatus, since the focus control is performed by using the focus control drive coil p1, there is a drawback that the control system becomes complicated, and FIG. As described above, the optical head He includes the movable table k1, the carriage k2, the bobbins k4, k
5, and is arranged at a position distant from the drive source k composed of the magnetic yokes k6, k7, etc., and the moment control is easily applied to the optical head He during the moving operation, so that the track control is not stable. Was.

On the other hand, in the latter optical recording device,
Since the focus control is performed using the floating phenomenon of the optical head He, there is an advantage that the control system is simplified. However, the optical head He includes a driving device n2, a moving member n3, and the like. Is arranged via a spring-like suspension n1 at a position distant from the driving source n, and a moment force is easily applied to the optical head He during the moving operation, and the track control is not stable similarly to the former optical recording apparatus. There were drawbacks.

Accordingly, the following apparatus has been developed as an optical recording apparatus for solving these disadvantages.

That is, this optical recording apparatus has a structure shown in FIG.
As shown in FIG. 22, an elliptic cylindrical first and second movable body r1, r2 composed of a track control drive coil q1 disposed near an optical recording medium and a bobbin q2 around which the coil q1 is wound. A carriage q3 and a bearing q4 attached to the bottom surface side, and a pair of magnetic yokes q5 and q6 inserted through the cylindrical portions of the first and second movable bodies r1 and r2 and arranged in the radial direction of the optical recording medium; A drive unit q having permanent magnets q7, q8 disposed in the vicinity of the magnetic yokes q5, q6 along its length direction, and an elastic support member in a gap between the first and second movable bodies r1, r2. and an optical head He that is mounted via the optical recording medium and floats by an airflow accompanying rotation of the optical recording medium and converges a converged light from a light source on a converging surface of the optical recording medium. Drive By electromagnetic force caused by the energization of the yl q1 by moving the first and second movable body r1, r2 is obtained so as to move the operation of the optical head He to the track direction.

In this optical recording apparatus,
Since the focus control is performed by utilizing the floating phenomenon of the optical head He, the control system is simplified, and the optical head He is mounted in the gap between the first and second movable bodies r1 and r2. Therefore, the optical head He can be arranged in the vicinity of the drive center of the drive section q, and the moment force acting on the optical head He is reduced, and the track control thereof is advantageously stabilized.

[0011]

However, the above-mentioned prior art has the following problems. That is, in the case of the optical information recording / reproducing apparatus shown in FIGS. 17 to 19, a cylindrical rolling bearing or a sliding bearing is used as a guide for moving the optical head He in the track direction of the optical recording medium d. . At this time, if a cylindrical rolling bearing is used, at least three or more bearings are required, and a holding body for holding the bearing is required.
When a plain bearing is used, a cylinder having excellent strength and durability is required to hold the shaft, and it is necessary to assemble the shaft and the cylinder with high accuracy in assembling the head. In addition, in order to move the optical head with low vibration, it is necessary to apply a lubricant or form a lubricating film, but the durability is low, and vibration is generated due to depletion of the lubricant or peeling of the lubricating film. There was a problem. This is because, when a driving force in the track direction acts on the main body of the optical head, it is difficult to completely match the center of gravity of the head main body with the point of application of the driving force. It is presumed that the force acting on the carriage does not completely coincide with the track direction, and the component of this shift causes the carriage to incline, thereby accelerating wear at a specific location. In particular, when using a flying head, the flying body presses the optical head in a direction perpendicular to the optical disk surface, and at the same time, a driving force is applied to move the head in the track direction. Since it works, it works so that it slides into the sliding bearing surface, so that the durability is particularly low and it is difficult to reduce the vibration.

[0012]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art.
It is an object of the present invention to provide an optical information recording / reproducing apparatus which can move an optical head at high speed and accurately and can reduce the weight of the optical head and efficiently assemble the optical head.

[0013]

[0014]

[0015]

[0016]

That is, according to the first aspect of the present invention, the movable portion of the optical head including the reflecting member and the condenser lens is moved in the track direction of the optical recording medium by the driving means to record and reproduce information. In the optical information recording / reproducing apparatus for performing the above, a part of a driving coil constituting a driving means for moving the movable portion in the track direction is a double-body type, and the movable portion is moved in the track direction. Using a linear motion bearing as a guide for the movable part,
An elliptical cylindrical coil body, and the coil body
Between the magnetic yoke to be inserted and the inner wall of the coil body.
A reinforcing coil wall forming an insertion portion of the magnetic yoke between
The track of the inner wall and the coil reinforcing wall
A curvature half of the reinforcing coil wall with respect to a cross-sectional shape perpendicular to the direction.
It is configured to have an arc shape whose diameter is larger than the radius of curvature of the inner wall .

[0018]

[0019]

As the driving coil, for example, a coil made of a material having substantially the same thermal expansion coefficient as the heat insulating material is used.

Optical information recording / reproducing for recording / reproducing information by moving a movable portion of an optical head composed of a reflecting member, a condensing lens, etc. in a track direction of the optical recording medium by a driving means. In the apparatus, a part of a driving coil constituting a driving means for moving the movable portion in the track direction is a double-body type, and a side surface of the coil facing the optical recording medium and a bearing serving as a movement guide for the movable portion. You may comprise so that an opening may be provided in the side surface facing a member.

A condensing lens is attached to the opening of the driving coil facing the optical recording medium via, for example, an elastic support member. The opening is provided on a side surface of the coil facing the bearing of the coil. Is provided with a reflecting member for reflecting laser light from a light source toward the optical recording medium.

Further, the reflecting member may be directly joined to the bearing member.

Further, a groove for mounting the reflection member is formed in the portion of the bearing member where the reflection member is mounted, for example.

As the movable member of the linear motion bearing, for example, a light alloy is used.

As the movable member of the linear motion bearing, for example, an inorganic material is used.

Further, a configuration may be adopted in which a gap is provided in the movable portion of the linear motion bearing.

Further, a thin film of, for example, metal is formed in a contact area of the movable portion of the linear motion bearing with the steel ball.

In such a technical means, the portion of the optical head to which the condensing lens is attached is, for example, one that floats by receiving an airflow accompanying rotation of the optical recording medium, and uses a floating pressure from the optical recording medium. Is formed at least on the bottom side in order to receive the vehicle efficiently. In addition, as a material constituting a member that floats a portion of the optical head to which the condenser lens is attached, a ceramic material, amorphous carbon, or the like can be used.

When the floating member is attached to the optical head via a leaf spring, the supporting position of the supporting member that movably supports in the track direction and the mounting position of the leaf spring to which the floating member is joined are determined. The optical head is arranged so as to be located in the center region in the moving direction.

[0031]

[Action]

[0032]

According to the above technical means,
For example, the invention according to claim 1 has a structure in which a part of a driving coil constituting a driving unit for moving a movable portion in a track direction is a twin-body type, and the drive coil for moving the movable portion in a track direction. Since the linear motion bearing is used as the guide, an opening is provided on the side of the driving coil facing the optical recording medium and the side facing the bearing member serving as the moving guide of the movable portion, so that the movable portion A reflecting member, a condensing lens, and the like can be provided at the center, and a moment force is not applied to the optical head when the optical head is moved, so that the optical head can be quickly and accurately moved to a predetermined position. .

[0034] Further, according to the first aspect of the present invention, the movable portion is formed between the coil main body formed into an elliptical cylindrical shape, a magnetic yoke inserted through the coil main body, and an inner wall of the coil main body. A reinforcing coil wall forming an insertion portion of the magnetic yoke, wherein a radius of curvature of the reinforcing coil wall is larger than a radius of curvature of the inner wall with respect to a cross-sectional shape of the inner wall and the coil reinforcing wall perpendicular to the track direction. Since it is configured to have a large arc shape, no useless space is formed in the coil main body, and from this point as well, the size and weight of the movable portion can be reduced.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

That is, as shown in FIGS. 1 to 4, an optical information recording / reproducing apparatus according to this embodiment includes an optical head 2 disposed near an optical disc 1 as an optical recording medium, A driving unit 3 for moving the head 2 in the track direction of the optical disk 1 constitutes a main part thereof.

As shown in FIG. 5, the optical head includes a semiconductor laser 64 as a light source and a semiconductor laser 64 as a light source.
Lens 65 for converting the diffused laser light from the laser beam into parallel laser light, and a beam shaping prism 66 for converting the spot shape of the laser light from an elliptical shape to a substantially circular shape.
And a beam splitter 67 for separating incident laser light incident on the optical disk 1 and reflected laser light reflected from the optical disk 1, and converts laser light that is linearly polarized light passing through the beam splitter 67 into circularly polarized light.さ せ る wavelength plate 68 to be moved, and 上 記 wavelength plate 68 movably provided
The objective lens 69 for converging the laser light passing through the optical disc 1 on the converging surface of the optical disc 1, and the reflected laser light split by the beam splitter 67 into four parts for obtaining a tracking error signal, a focusing error signal, and a reproduction RF signal. It is known that a cylindrical lens 71 that enters a PIN photodiode 70 constitutes a main part thereof.

In such an optical information recording / reproducing apparatus, information is recorded spirally or concentrically on one surface of the optical disk, or an optical lens such as an objective lens 9 is used to reproduce the recorded information. The optical head 2 incorporating the system is moved by the driving unit 3 along the radial direction of the optical disk 1 (that is, the track direction).

First, the optical head 2 is mounted on the optical disk 1
A floating body 22 made of alumina ceramics provided with an optical path opening 21 for floating the laser beam from the semiconductor laser light source 4 toward the optical disk 1 while floating by an air flow accompanying the rotation of the floating body 22; It is composed of a plastic objective lens 9 for converging laser light from the semiconductor laser 4 attached to the optical path opening 21 to the converging surface of the optical disk 1 and facing the optical disk 1 of the floating body 22. At the air inflow end and the air outflow end of the surfaces to be tapered, tapers 24 and 25 are provided for smoothing the inflow and outflow of air, and a central escape portion for stabilizing the floating traveling of the optical head 2 is provided at the center thereof. 26 are provided.

On the other hand, the driving section 3 is a movable body 4 formed by a bobbin-less driving coil 40 which is formed by joining the wound coils with an epoxy adhesive and integrally forming the same.
An aluminum carriage 51 and a linear bearing 52 attached to the bottom surface of the movable body 4, and a pair of pure irons inserted through the insertion portion 41 of the movable body 4 and arranged in the track direction of the optical disc 1. Magnetic yokes 61, 6
2, arc-shaped magnets 71, 72 formed along the length direction of the magnetic yokes 61, 62 and formed of rare-earth iron-based permanent magnets, and a holder 73 for holding these magnets 71, 72; The main part thereof is constituted by a pure iron magnetic fixing base 74 that supports the entire components such as the carriage 51 and the linear bearing 52.

A hard thin film of chromium metal or the like is formed on the contact surface side of the carriage 51 with the linear bearing 52 to improve durability, and a bearing 53 is fitted to reduce frictional force. I have.

As shown in FIGS. 2 and 3, the movable body 4 is formed into an elliptical cylinder and has a coil body 42 having a substantially square opening 43 on a side surface facing the optical disc 1. And a pair of reinforcing coil walls 45 and 46 that form the insertion portions 41 of the magnetic yokes 61 and 62 between the inner wall 44 in the coil main body 42 and
A prism 47 for introducing laser light from a semiconductor laser to the optical disk 1 is disposed on an inner wall surface of the coil body 42 facing the opening 43.

As shown in FIG. 1, the cross-sectional shape of the inner wall 44 of the coil body 42 is set to an arc shape substantially equal to the radius of curvature of the arc-shaped magnets 71, 72.
2, the cross-sectional shape of the reinforcing coil walls 45, 46 is set to an arc shape having a larger radius of curvature than the inner wall 44 of the coil body 42. It is adjusted so that no useless space is formed.

Next, a spring member 8 made of phosphor bronze shown in FIG. 7 is attached to the opening 43 of the coil main body 42, and the optical head 2 is attached to the opening 43 via the spring member 8 to provide the optical member. Is an information recording and reproducing apparatus.

By the way, in this embodiment, a heat insulating material is interposed in a joining region between the driving coil constituting the driving means for moving the movable portion in the track direction and the movable portion. .

That is, on the driving coil, FIG.
As shown in the figure, the spring material 8 formed in a substantially circular shape in a plane is
It is mounted and fixed via an annular mounting member 81. As shown in FIG. 7, the spring member 8 has an outer annular portion 8a, an intermediate annular portion 8b, and an inner annular portion 8c arranged concentrically, and each of the annular portions 8a, 8a, 8c. 8d extending diametrically and forming an angle of 90 degrees with each other
And are connected to each other. The annular mounting member 81 is formed so as to have the same diameter as the outer peripheral portion of the spring member 8, and is bonded and fixed to the outer peripheral portion of the spring member 8.

As shown in FIG. 1, a heat insulating material 81 formed in the same shape as the annular mounting member is interposed between the annular mounting member and the driving coil by bonding or the like. As the heat insulating material 81, for example, a material made of a material having substantially the same thermal expansion coefficient as the driving coil is used.

As shown in FIG. 8, a heat insulating material 82 formed in a flat rectangular shape is interposed between the driving coil and the linear bearing 52 by bonding or the like.

In the optical information recording / reproducing apparatus thus constructed, the movable body moves in the track direction of the optical disk due to the electromagnetic force generated when the drive coil is energized, as in the prior art. The optical head is also moved to perform track control, while focus control is performed by utilizing the floating phenomenon of the optical head to simplify the drive system.

In this optical information recording / reproducing apparatus, since the movable body is constituted by a bobbin-less driving coil, the weight of the movable body is reduced by the amount without the bobbin as compared with the conventional apparatus. It has the advantage that can be achieved.

Incidentally, in this embodiment, the total weight of the movable part including the optical head is 4 g or less as shown below, which is 60% lighter than the conventional one.

Optical head: 0.3 g

Driving coil 1.8 g

Prism: 0.3 g

Mounting jig such as spring material: 0.7 g

Further, in this optical information recording / reproducing apparatus, since the pair of reinforcing coil walls 45 and 46 are provided at the opening 43 forming portion in the coil main body 42, the rigidity of the coil main body 42 is increased, and Since the coil body 42 and the coils for the reinforcing coil walls 45 and 46 also exist in the opening 43 forming portion, there is an advantage that the strength of the electromagnetic force accompanying the energization of the driving coil is increased.

Further, an opening 43 in the coil body 42 is provided.
A prism 47 for reflecting the laser beam from the light source toward the optical disk 1 is disposed on the inner wall surface facing the optical disk 1, and the optical head 1 is provided in the opening 43 of the coil main body 42 via the spring material 8.
Since the optical head 1 is mounted, the mounting position of the optical head 1 approaches the vicinity of the drive center axis of the movable body 4, so that there is an advantage that the moment force during the movement of the optical head 1 can be reduced.

Accordingly, in the optical information recording / reproducing apparatus, the rigidity and weight of the movable body 4 can be increased, the strength of the electromagnetic force accompanying the energization can be increased, and the moment when the optical head 1 moves can be improved. Since the force can also be reduced, stable high-speed operation of the optical head 2 becomes possible, and there is an advantage that the access time can be reduced.

Further, a spring member 8 for attaching the optical head 2 is provided.
The configuration is arbitrary as long as it can support the optical head 2 so as to be able to float and does not block the laser beam from the light source. Instead of the spring material 8 of FIG. 7 applied in this embodiment, For example, the spring materials shown in FIGS. 9A to 9C can naturally be applied. still,
When the spiral spring shown in FIG. 9B is applied, the support condition of the optical head 1 becomes uniform, the floating traveling of the optical head 1 is stabilized, and the spiral condition of the spring material 8 is adjusted and attached. There is an advantage that the fine adjustment at the time of operation can be performed and the mounting operation can be simplified.

Further, in this embodiment, since the heat insulating material is interposed in the joint area between the driving coil constituting the driving means for moving the movable section in the track direction and the movable section, The heat generated by energizing the driving coil can be prevented from being transmitted to other parts of the movable part, and no displacement occurs in the head movable part joined to the driving coil. An optical information recording / reproducing device capable of highly accurate positioning can be realized.

Further, in this embodiment, a linear motion bearing is used as a guide for moving the movable portion in the track direction.

That is, the movable body 4 of the optical head is mounted on the carriage 51 of the linear motion bearing 52 as shown in FIG. This linear motion bearing 5
As shown in FIG. 14, in the second carriage 51, a light alloy material having a low specific gravity, such as aluminum, is used for the movable portion of the bearing, so that the weight of the movable portion of the head can be reduced. In addition, as the movable member of the carriage 51 of the linear motion bearing 52, a lightweight and durable bearing can be realized by using an inorganic material such as ceramic in addition to the light alloy material.

The carriage 51 of the linear motion bearing 52
By forming a thin film of chromium or the like on the contact portion with the steel ball 53, the durability can be improved while maintaining the weight reduction.

Further, as shown in FIG. 15, the carriage 51 of the linear motion bearing 52 may be provided with an air gap penetrating in the thickness direction. Lightening can be achieved while maintaining strength.

As described above, since the linear motion bearing is used as a guide for moving the movable portion in the track direction, the structure of the guide for moving the movable portion in the track direction is simplified. Therefore, it is not necessary to use a large number of bearing members, so that the weight of the optical head can be reduced and the optical head can be efficiently assembled.

Second Embodiment

FIG. 10 shows a second embodiment of the present invention. The same parts as those of the above embodiment are denoted by the same reference numerals and described. A part of the driving coil constituting the driving means for moving the coil in the track direction is a double-body type, and the side of the coil facing the optical recording medium and the side facing the bearing member serving as the moving guide of the movable portion are provided. It is configured to provide an opening.

That is, as shown in FIG. 10 and FIG. 11, the movable body 4 is formed in an elliptic cylindrical shape and has a substantially square opening 43 on the side surface facing the optical disc 1 as described above.
Are formed, and a pair of reinforcing coil walls 45 and 46 that form the insertion portions 41 of the magnetic yokes 61 and 62 between the coil body 42 having the coil body 42 and the inner wall 44 in the coil body 42.

A prism 47 for reflecting laser light from a light source toward the optical recording medium is disposed in an opening provided on the side of the coil facing the linear bearing.
The prism 47 is directly joined to the bearing member as shown in FIG. Further, as shown in FIG. 12, a groove for attaching the prism 47 is formed in a portion where the prism 47 of the linear bearing is attached, so that the positioning and attachment of the prism 47 can be easily performed.

As described above, a part of the driving coil which constitutes the driving means for moving the movable portion in the track direction is of a double-body type, and the side of the coil facing the optical recording medium and the moving guide of the movable portion are provided. An opening is provided on the side surface facing the bearing member to be used, and the constituent members of the optical system are arranged in the opening. By arranging the components of the system, even when the components of the optical system such as the reflection member and the condenser lens are arranged in the movable part, the center of gravity of the optical system components such as the reflection member and the condenser lens is adjusted. The optical head can be matched with the center of gravity of the movable part, and a moment force is not applied to the optical head when the optical head is moved, so that the optical head can be quickly and accurately moved to a predetermined position.

Third Embodiment

FIG. 13 shows a third embodiment of the present invention. The same parts as those of the above embodiment are denoted by the same reference numerals. It is configured to use a linear motion bearing as a guide for moving the motor in the track direction.

That is, the movable body 4 of the optical head is mounted on the carriage 51 of the linear motion bearing 52 as shown in FIG. This linear motion bearing 5
As shown in FIG. 14, in the second carriage 51, a light alloy material having a low specific gravity, such as aluminum, is used for the movable portion of the bearing, so that the weight of the movable portion of the head can be reduced. In addition, as the movable member of the carriage 51 of the linear motion bearing, a lightweight and durable bearing can be realized by using an inorganic material such as ceramic in addition to the light alloy material.

The carriage 51 of the linear motion bearing 52
By forming a thin film of chromium or the like on the contact portion with the steel ball 53, the durability can be improved while maintaining the weight reduction.

Further, as shown in FIG. 15, the carriage 51 of the linear motion bearing 52 may be provided with a void portion penetrating by the thickness method. In such a case, the strength of the carriage 51 of the linear motion bearing is provided. , While reducing the weight.

As described above, since the linear motion bearing is used as a guide for moving the movable portion in the track direction, the configuration of the guide for moving the movable portion in the track direction is simplified. Therefore, it is not necessary to use a large number of bearing members, so that the weight of the optical head can be reduced and the optical head can be efficiently assembled.

[0077]

According to the present invention, there is provided the above-described structure and operation. The optical information can be moved at high speed and accurately, and the optical information can be lightened and the optical head can be efficiently assembled. A recording / reproducing device can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an optical information recording / reproducing apparatus according to the present invention.

FIG. 2 is a perspective view showing the optical information recording / reproducing apparatus.

FIG. 3 is a longitudinal sectional view showing the optical information recording / reproducing apparatus.

FIG. 4 is a perspective view of the optical information recording / reproducing apparatus with a part thereof removed.

FIG. 5 is a perspective view showing an optical system of the optical information recording / reproducing apparatus.

FIG. 6 is a perspective view showing a linear sliding bearing.

FIG. 7 is a plan view showing a leaf spring.

FIG. 8 is a plan view of the optical information recording / reproducing apparatus with a part removed.

FIGS. 9A to 9C are plan views each showing another example of a leaf spring.

FIG. 10 is a sectional view showing another embodiment of the optical information recording / reproducing apparatus according to the present invention.

FIG. 11 is a longitudinal sectional view showing the optical information recording / reproducing apparatus.

FIG. 12 is a perspective view showing a linear sliding bearing in the embodiment.

FIG. 13 is a sectional view showing another embodiment of the optical information recording / reproducing apparatus according to the present invention.

FIG. 14 is a perspective view showing a linear sliding bearing according to the embodiment.

FIG. 15 is a perspective view showing a modification of the linear sliding bearing according to the embodiment.

FIG. 16 is a perspective view showing an optical system of a conventional optical information recording / reproducing apparatus.

FIG. 17 is a perspective view of a conventional optical information recording / reproducing apparatus with a part thereof removed.

FIG. 18 is a cross-sectional view showing a part of a conventional optical information recording / reproducing apparatus with a part thereof removed.

FIG. 19 is a perspective view showing another example of a conventional optical information recording / reproducing apparatus.

FIG. 20 is a perspective view showing still another example of the conventional optical information recording / reproducing apparatus.

FIG. 21 is a sectional view showing still another example of the conventional optical information recording / reproducing apparatus.

FIG. 22 is a partially omitted perspective view showing still another example of the conventional optical information recording / reproducing apparatus.

[Explanation of symbols]

2 Optical head, 40 drive coil, 51 carriage, 52 linear motion bearing, 53 steel ball.

Claims (1)

(57) [Claims] 1. An optical information recording / reproducing device for recording / reproducing information by moving a movable portion of an optical head including a reflecting member, a condenser lens and the like in a track direction of an optical recording medium by a driving means. In the apparatus, a part of a driving coil constituting a driving means for moving the movable portion in the track direction is a double-body type, and a linear motion bearing is provided as a guide for moving the movable portion in the track direction. Used, the movable part is a coil main body formed into an elliptical cylindrical shape,
A magnetic yoke inserted through the coil body,
Forming the magnetic yoke insertion portion between the inner wall of the body
A reinforcing coil wall, the inner wall and the coil reinforcing wall
With respect to the cross-sectional shape perpendicular to the track direction
A circle in which the radius of curvature of the il wall is larger than the radius of curvature of the inner wall
An optical information recording / reproducing device having an arc shape .