JPH0668482A - Both-side access mechanism of optical disk drive - Google Patents

Abstract

PURPOSE:To provide the both-side access mechanism of the optical disk drive which can evade a collision between a cassette and an optical head at the time of cassette loading. CONSTITUTION:This mechanism has a couple of carriages 14 and 15 mounted with optical heads 11 and 12, two guide shaft couples 20 and 21 which support the carriages 14 and 15 movably in a radius directions of an optical disk through a support bearing 16, a couple of movable bases 22 and 23 which support the guide shaft couples 20 and 21, and rotary support shafts 24 and 25 which support the movable bases 22 and 23 so that they slant and oscillate to optical disk surfaces around their one-end sides. Then the movable bases 22 and 23 are rotated between a 1st rotation position for disk reproduction and a 2nd rotation position for the loading and unloading of a cassette 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus, and more particularly to a double-sided access mechanism of an optical disk drive for reproducing both sides of an optical disk.

[0002]

2. Description of the Related Art Conventionally, in an optical disk drive for performing single-sided reproduction of an optical disk housed in a cassette,
As shown in FIG. 4, loading of the cassette is performed by moving the cassette 2 in which the optical disc D is housed in a fixed position where the optical head 1 is on standby in the horizontal and vertical directions with respect to the disc surface. When the loading is completed, the objective lens mounting portion 1a of the optical head 1 is inserted into the opening provided in the cassette 2, and the disc can be reproduced.

However, when considering a configuration in which two optical heads are fixedly arranged facing each other in order to reproduce both sides of an optical disk, the distance between the optical heads is smaller than the thickness of the cassette, that is, the optical heads are obstacles. As a result, the cassette cannot be transported to the target position.

[0004]

Thus, when an existing optical head access mechanism is used to construct a double-sided reproduction optical disk drive, the optical head becomes an obstacle and the cassette can be loaded to a target position. There was a problem that I could not do it.

The present invention is intended to solve such problems, and an object thereof is to provide a double-sided access mechanism for an optical disk drive which can avoid a collision between a cassette and an optical head during cassette loading / unloading. .

[0006]

In order to achieve the above-mentioned object, a double-sided access mechanism of an optical disk drive according to a first aspect of the present invention has two optical heads for performing double-sided reproduction of an optical disk housed in a cassette. In a double-sided access mechanism of an optical disk drive that is opposed to each other with the optical disk in between, a pair of carriages on which the optical heads are mounted, drive coils fixed to the respective carriages, and the optical disks via the support bearings of the respective carriages. A pair of guide shafts respectively movably supported in the radial direction of the, and a magnetic circuit that generates a driving force for moving each of the carriages along the pair of guide shafts with the drive coil. ,
A pair of movable bases that respectively support the pair of guide shafts; a rotation support member that supports the movable bases so as to tilt and swing with respect to the optical disk surface about one end of each of the movable bases; Through the rotation support member, there are provided means for rotating the first rotation position during disk reproduction and the second rotation position during loading / unloading of the cassette.

In order to achieve the above-mentioned object, the double-sided access mechanism of the optical disk drive of the second invention is designed to perform double-sided reproduction of the optical disk stored in the cassette.
In a double-sided access mechanism of an optical disc drive in which two optical heads are arranged to face each other with the optical disc interposed therebetween,
A pair of carriages on which the optical head is mounted, drive coils fixed to the respective carriages, and two guide shafts that respectively support the respective carriages via support bearings so as to be movable along the radial direction of the optical disk. A pair, a magnetic circuit that generates a driving force for moving each of the carriages along the pair of guide shafts and the drive coil, a movable base that supports one of the pair of guide shafts, and the movable base. A rotation supporting member that supports the base so as to be capable of tilting and swinging with respect to the optical disk surface with one end thereof as an axis, and the movable base via the rotation supporting member when the disk is reproduced.
And a second rotating position at the time of loading / unloading the cassette.

[0008]

According to the first aspect of the invention, each movable base is supported so as to be tiltable and swingable with respect to the optical disk surface about each one end as an axis.
When playing a disc, each movable base is tilted to the first rotational position where the distance between the optical heads is narrowed, and when loading / unloading the cassette, each movable base is moved to the second rotational position where the distance between the optical heads is widened. Tilt the base.

According to the second aspect of the invention, the movable base is supported so as to be tiltable and swingable with respect to the optical disk surface with one end thereof as an axis.
When playing a disc, the movable base is tilted to the first rotation position where the distance between the optical heads is narrowed, and when loading / unloading the cassette, the movable base is moved to the second rotation position where the distance between the optical heads is widened. Incline. Therefore, according to these inventions, it is possible to avoid a collision between the cassette and the optical head at the time of loading / unloading the cassette.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing the structure of a double-sided access mechanism of an optical disk drive according to an embodiment of the present invention, and FIG.
FIG.

In these figures, 11 and 12 are vertically opposed to each other with an optical disc interposed therebetween in order to perform double-sided reproduction of the optical disc D housed in the cassette 13.
Two optical heads are shown. Each optical head 11, 12
Are mounted on one end of each carriage 14, 15. Further, driving coils 17, 18 for generating a driving force between the carriages 14, 15 and a magnetic circuit 16 fixed to a casing (not shown) are fixed to the other ends of the carriages 14, 15. Further, each of the carriages 14 and 15 is provided with a pair of separate guide shafts 2 via a plurality of support bearings 19 so as to be moved in the radial direction of the optical disc D.
It is supported by 0 and 21. Also, each guide shaft pair 2
0 and 21 are supported by separate movable bases 22 and 23, respectively. One end of each of the movable bases 22 and 23 is fixed to the housing via rotary support shafts 24 and 25, and the movable bases 22 and 23 are tilted and oscillated with respect to the optical disk surface about the rotary support shafts 24 and 25. It is said to be movable. The movable bases 22 and 23 are connected to the loading mechanism and the unloading mechanism via a connecting mechanism (not shown) so as to rotate in association with the loading operation and the unloading operation of the cassette 13.

The center yokes 16a and 16b of the porcelain circuit 16 are inserted in the drive coils 17 and 18 fixed to the carriages 14 and 15, respectively. Is
Optical head 1 accompanying tilting and swinging of movable bases 22 and 23
It is larger than that of the cross section of the center yoke in consideration of the vertical movement amounts of 1 and 12.

Next, the operation of this double-sided access mechanism will be described with reference to FIG. When cassette loading is started from the state shown in FIG. 3A, as shown in FIG. 3B, the movable bases 22 and 23 interlock with the rotary support shaft 2 as shown in FIG. 3B.
It rotates about 4 and 25 in the directions of arrows A and A ′, respectively.

While the cassette 13 is being conveyed in the horizontal direction, that is, in the direction of arrow B, the movable bases 22 and 23 reach the limit of rotation, whereby the path of the cassette 13 is opened.

After this, when the cassette 13 reaches the disc reproducible position shown in FIG. 3C and the loading is completed, as shown in FIG. 3D, the movable bases 22, 2 are moved.
3 rotates in the opposite direction, that is, in the directions of arrows C and C ', and returns to the state of FIG. As a result, the objective lens mounting portions 11a and 12a of the optical heads 11 and 12 are inserted into the openings (not shown) provided on both sides of the cassette 13, respectively, so that both sides of the disc can be reproduced.

Also, when the cassette 13 is unloaded (discharged), the movable bases 22 and 23 are similarly rotated.

That is, immediately before the unloading operation is actually started, the movable bases 22 and 23 are moved in the direction in which the backward path of the cassette 13 is opened, that is, the arrow A in FIG.
It rotates in the A'direction. After this, when the cassette 13 is almost discharged, the movable bases 22, 23
Is a direction for closing the exit of the cassette 13, that is, an arrow C,
Each of the movable bases 22 and 23 is returned to its original state after the cassette 13 is completely ejected and starts to rotate in the C'direction.

Thus, according to the double-sided access mechanism of the optical disk drive of this embodiment, even if the two optical heads 11 and 12 for double-sided reproduction are arranged to face each other with the optical disk in between, collision with the optical heads 11 and 12 is prevented. The loading / unloading operation of the cassette 13 can be performed without inviting.

In this embodiment, each optical head 11,
12 is configured to move up and down together, the cassette 13
By adding not only horizontal movement but also vertical movement, that is, movement in the thickness direction of the optical disc, to the loading / unloading operation of 1, it is possible to move up and down only one optical head, that is, one movable base. is there.

[0020]

As described above, according to the optical disk drive of the present invention, even if the optical heads for double-sided reproduction are arranged to face each other with the optical disk in between, the cassette loading / loading can be performed without causing a collision with the optical head. An unloading operation can be performed.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a double-sided access mechanism of an optical disc drive according to an embodiment of the present invention.

2 is a side view of the double-sided access mechanism of FIG. 1. FIG.

FIG. 3 is a diagram showing an operation of the double-sided access mechanism shown in FIG. 1 during cassette loading.

FIG. 4 is a diagram showing a state of cassette loading in a conventional single-sided reproduction optical disk drive.

[Explanation of symbols]

11, 12 ... Optical head, 13 ... Cassette, 14, 15
... Carriage, 16 ... Magnetic circuit, 17, 18 ... Drive coil, 19 ... Support bearing, 20, 21 ... Guide shaft pair, 22, 23 ... Movable base, 24, 25 ... Rotation support shaft.

Claims (2)

[Claims] 1. A double-sided access mechanism of an optical disk drive, wherein two optical heads are arranged to face each other with the optical disk sandwiched therebetween to perform double-sided reproduction of an optical disk housed in a cassette. And a drive coil fixed to each of the carriages, and each of the carriages movably supported in the radial direction of the optical disk through a support bearing.
Pair of guide shafts, a magnetic circuit that generates a driving force for moving each of the carriages along the pair of guide shafts, and a pair of movable members that respectively support the pair of guide shafts. A base, a rotation support member that supports each of the movable bases so as to be tiltable and swingable with respect to the optical disc surface with one end thereof as an axis, and each of the movable bases via the rotation support member when the disc is reproduced. A double-sided access mechanism for an optical disk drive, comprising means for rotating the cassette between a first rotation position and a second rotation position during loading / unloading of the cassette. 2. A double-sided access mechanism of an optical disk drive, wherein two optical heads are arranged to face each other with the optical disk sandwiched therebetween in order to perform double-sided reproduction of the optical disk housed in a cassette. And a drive coil fixed to each of the carriages, and each of the carriages movably supported in the radial direction of the optical disk through a support bearing.
Pair of guide shafts, a magnetic circuit that generates a driving force for moving each of the carriages along the pair of guide shafts and the drive coil, and a movable base that supports one of the pair of guide shafts. A rotation supporting member that supports the movable base so that the one end of the movable base is tiltable and swingable with respect to the optical disc surface; and the movable base is a first rotation position during disc reproduction through the rotation supporting member. And a means for rotating the cassette between a second rotation position at the time of loading / unloading the cassette, and a double-sided access mechanism for an optical disk drive.