JP2002237177A - Thin optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin optical disk device which can detect vibration of a base (feed chassis) directly and accurately, which is constituted of inexpensive parts, and provided with at least a vibration detecting means which can detect vibration of at least two directions. SOLUTION: A magnet 41 is arranged at a feed chassis 25 to which a pickup section 23 and a turn table 24 are mounted, and a hole element 42 is arranged at a printed circuit board 17 of a position being adjacent and opposing when a drawer case is stored in an outer case 11. The magnet 41 is arranged in a state in which it is tilted by an angle of 45 deg. based on the hole element 42. The other magnetic sensor such as a MR element or the like can be used instead of the hole element, as a magnetic sensor. Arrangement of the magnet 41 and that of the hole element 42 may be reversed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to a thin optical disk device incorporated in a notebook personal computer or the like.

[0002]

2. Description of the Related Art Optical disc apparatuses of this type can be roughly classified into the following two types in terms of structure. The first type of optical disk device is a type in which a disk driving / reproducing mechanism such as an optical pickup, a disk motor, and a turntable is incorporated (mounted) in a tray (drawer case), and the second type of optical disk device is In this type, only an optical disk is mounted on a tray (drawer case), and the disk drive / playback mechanism is built in the unit (housing). Hereinafter, the former (the first type of optical disk device) is also referred to as a tray built-in type optical disk device,
The latter (the second type of optical disk device) is also called an optical disk device with a built-in unit.

In an optical disk device with a built-in unit, a disk drive / playback mechanism must be built in the unit, and it is difficult to reduce the thickness. On the other hand, an optical disk device with a built-in tray incorporates a disk drive / playback mechanism in a tray (drawer case), so that it can be made thinner. Therefore, the optical disk device with a built-in tray is also called a thin optical disk device. The present invention relates to a thin optical disk device. Such a thin optical disk device is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-44955 (hereinafter referred to as "prior art document").

A conventional thin optical disk device described in the above-mentioned prior art document has a main chassis (outer case) capable of storing a tray (drawer case).
A lower cover that covers the tray (drawer case) from below, a base (feed chassis) attached to the upper portion of the lower cover, and an optical pickup unit movably attached to the base (feed chassis).
And a turntable attached to a base (feed chassis). As described above, since the optical pickup section and the turntable are attached to the base (feed chassis), the base (feed chassis) vibrates when the optical pickup section slides or the turntable is driven to rotate. . In order to prevent the vibration of the base (feed chassis) from being transmitted to the main chassis (outer case) via the lower cover, a base (feed chassis) is provided between the lower cover and the tray (drawer case). A plurality of vibration isolating members (elastic members) for absorbing the vibrations are provided. The vibration isolating member (elastic member) is called an insulator.
The vibration isolating member (insulator) is made of a material such as butyl rubber and silicon rubber. Base (feed chassis)
Is made of resin and has a plurality of insulator mounting portions for mounting a plurality of insulators, respectively.

[0005] As described above, in the thin optical disk device, despite the measures against vibration by the vibration isolating member (insulator), due to the influence of the recent double speed competition, the vibration which the thin optical disk device gives to the notebook type personal computer. Has been viewed as a problem. More specifically, the optical disk itself is manufactured for 1 × speed, whereas the thin optical disk device rotates the optical disk at a very high speed such as 24 × speed. Therefore, if the center of gravity of the optical disk is shifted (that is, the center of rotation of the optical disk is shifted from the center of gravity of the optical disk), or if the optical disk is installed in a state inclined with respect to the turntable, the optical disk rotates at a high speed. Then, the turntable vibrates, and the vibration is transmitted to the main chassis (outer case) via the base (feed chassis), the vibration isolating member (insulator), and the lower cover.

Therefore, conventionally, the vibration value of the base (feed chassis) when the optical disc is rotated is detected, and when the vibration of the base (feed chassis) exceeds a specified value, the rotation of the optical disc is stopped. Countermeasures such as dropping (for example, 12 times speed) are taken.

Conventionally, the vibration of a base (feed chassis) is detected in a pseudo manner (indirectly) by monitoring a change in a servo signal for driving an optical pickup unit.

[0008]

However, it is difficult to accurately detect the vibration of the base (feed chassis) by the conventional indirect vibration detection method. This is because the change in the servo signal includes factors other than the vibration of the base (feed chassis). The above factors include that the optical disk is eccentric (that is,
Although the center of rotation of the optical disk substantially coincides with the center of gravity of the optical disk, the center of the track is shifted from the center of rotation of the optical disk.

On the other hand, a method using an acceleration sensor to directly detect vibration at the base (feed chassis) is also conceivable. That is, it is conceivable to attach the acceleration sensor to the base (feed chassis). However, the acceleration sensor is expensive, and there is a problem that the direction of detecting the vibration is limited by the mounting method (position). More specifically, when an optical disc whose center of gravity is shifted or tilted rotates at a high speed, the base (feed chassis) is moved to the main chassis (outer case).
In contrast, it is considered that the vibration occurs in the vertical direction, the front-back direction, and the left-right direction. Therefore, it is considered that at least three acceleration sensors are required to detect the components in these three directions.

Accordingly, an object of the present invention is to provide a thin optical disk device provided with a vibration detecting means capable of directly and accurately detecting the vibration of a base (feed chassis).

Another object of the present invention is to provide a thin optical disk device provided with vibration detecting means composed of inexpensive components.

Still another object of the present invention is to provide a thin optical disk apparatus provided with a vibration detecting means capable of detecting vibrations in at least two directions by one vibration detecting means.

[0013]

According to the present invention, there is provided a thin optical disk device (10) of a type in which a disk drive / playback mechanism is incorporated in a drawer case (12), wherein the drawer case can be stored. Outer case (11)
And a lower cover (1) that covers the drawer case from below.
3), a feed chassis (25) attached to the upper part of the lower cover, a pickup unit (23) movably attached to the feed chassis, and a turntable (24) attached to the feed chassis.
A plurality of insulators (30) disposed between the lower cover and the drawer case for absorbing vibrations in the feed chassis, and a print fixedly installed on the outer case and mounting electronic components thereon; In the above-mentioned thin optical disk device provided with a circuit board (17),
A magnet (41) and a magnetic sensor (42) are provided at one and the other of the feed chassis and the printed circuit board at positions close to and opposed to each other when the drawer case is housed in the outer case. A thin optical disk device characterized by being arranged is obtained.

In the above thin optical disk device, the magnet is, for example, at 45 ° with respect to the magnetic sensor.
It is preferable that they are arranged in a state of being inclined by a predetermined angle. As the magnetic sensor, a Hall element, an MR element, or the like can be used. In the thin optical disk device,
The magnet may be arranged on the feed chassis, and the magnetic sensor may be arranged on the printed circuit board, or the magnet may be arranged on the printed circuit board, and the magnetic sensor may be arranged on the feed chassis. .

[0015] The reference numerals in the parentheses are given to facilitate understanding of the present invention, and are merely examples, and it goes without saying that the present invention is not limited to these.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIGS. 2 and 3, a thin optical disk device 10 according to an embodiment of the present invention will be described. The illustrated thin optical disk device 10 is a CD-ROM drive device, which is a device built in a housing of a notebook personal computer (not shown).
The thin optical disk device 10 shown in the figure is a disk device with a built-in tray in which a disk drive / playback mechanism such as an optical pickup, a disk motor, and a turntable is incorporated (mounted) in a tray (drawer case) 12 as described later. It is.

FIG. 2 shows a state in which the tray (drawer case) 12 has been moved to a disk replacement position pulled out of the main chassis (outer case) 11, and FIG. 7 shows a state where the disk has been moved to the disk mounting position stored in the outer case 11. 2 and 3 show a state in which a top cover (not shown) to be attached to the upper surface and a front panel (not shown) to be attached to the front surface have been removed. 2, (a) is a plan view,
(B) is a right side view. 3A is a plan view, FIG. 3B is a right side view, and FIG. 3C is a right side view.

The thin optical disk device 10 includes a tray (drawer case) 12 for receiving an optical disk (CD-ROM) (not shown), and a lower cover 13 that covers the tray (drawer case) 12 at a lower side. And a tray sliding mechanism (guide rail) 14 that slidably supports a tray (drawer case) 12.

The tray (drawer case) 12 has a part of an optical disk (not shown) formed by the tray (drawer case) 1.
2 so that the width is smaller than the outer shape of the disk. The tray (drawer case) 12 is a tray sliding mechanism (guide rail) 1
As shown by arrows A and B in the figure, a manual chassis 4 allows the main chassis (outer case) 11 to slide in the front-rear direction. In FIG. 3, the tray (drawer case) 12 is inserted in the direction of arrow B and is located at the disc mounting position, and in FIG. It is located at the disk exchange position where the optical disk is exchanged.

The tray (drawer case) 12 is shown in FIG.
As shown in FIG. 3A, the optical disk drive has a disk facing surface 12a forming a space for the optical disk to face, and a pickup and turntable opening 12b formed in the disk facing surface 12a. Disk facing surface 12a
Has a width dimension smaller than the disk outer diameter,
It is formed so as to cover about 2/3 of the area of the disk. Thus, the thin optical disk device 10 can be reduced in size.

At the front end of the tray (drawer case) 12, a front panel (not shown) is fixed. The front panel slides integrally with the tray (drawer case) 12 in the front-rear direction indicated by arrows A and B. To the right of the center of the front panel is a tray (drawer case) 1
A switch button (not shown) is provided for releasing a lock by a lock mechanism described later when pulling out 2. Therefore, when the switch button is turned on in the state shown in FIG. 3, the front panel (tray 1) is operated as described later.
2) protrudes from the main chassis (outer case) 11 by a predetermined amount in the direction A. This facilitates the operation of pulling out the tray (drawer case) 12.

A printed circuit board 17 is provided at the rear (back) of the main chassis (outer case) 11, and a drive unit (feed assembly) 18 is attached to a tray (drawer case) 12, and a lower side is provided. From the lower cover 13. As described above, since the tray (drawer case) 12 moves in the directions of arrows A and B together with the drive unit (feed assembly) 18, the connection between the drive unit (feed assembly) 18 and the printed circuit board 17 is made by the flexible board 19. It is performed using. The printed circuit board side end of the flexible board 19 is
It is connected to the connector 20 provided on the printed circuit board 17. The drive unit side end of the flexible substrate 19 is connected to a connector (terminal) (described later) provided on a motor base (described below).

Next, the drive unit (feed assembly) 18 will be described with reference to FIGS. FIG. 4 is a plan view showing the drive unit (feed assembly) 18, and FIG.
Is a bottom view showing the drive unit (feed assembly) 18. FIG. The drive unit (feed assembly) 18 is provided with a pickup unit 23, a turntable 24, and the like. As described above, the drive unit (feed assembly) 18 is disposed above the lower cover 13. The drive unit (feed assembly) 18 includes a turntable 24, a base (feed chassis) 25 mounted on the upper portion of the lower cover 13, a pickup unit 23 movably mounted on the base (feed chassis) 25, and a pickup. A pickup driving unit (motor) 26 for moving the unit 23 in a predetermined disk radial direction;
Disk motor (spindle motor) 2 for rotating 4
7 and the like. The disk motor 27 is disposed on the motor base 21, and the connector (terminal portion) 22 is disposed on the motor base 21.

FIGS. 6 and 7 show a tray (drawer case) in which a base (feed chassis) 25 of a drive unit (feed assembly) 18 is fitted into the opening 12b.
FIG. FIGS. 6A and 6B are views showing a state where the lower cover 13 is removed, wherein FIG. 6A is a bottom view and FIG. 6B is a front view. FIGS. 7A and 7B are views showing a state where the lower cover 13 is attached, wherein FIG. 7A is a bottom view and FIG. 7B is a left side view.

As shown in FIG. 6A, a plurality of trays (drawer case) 12 for positioning the drive unit (feed assembly) 18 (four in this example) are provided.
Bosses 121). On the other hand, the lower cover 1
7 has a boss receiving portion 131 having a through hole (not shown) at a position corresponding to the four bosses 121, as shown in FIG. That is, at the time of assembly, as described later, the boss 12 of the tray (drawer case) 12 is used.
1 is fixed with the screw 28 in a state where it corresponds to the boss receiving portion 131 of the lower cover 13.

On the other hand, as shown in FIG. 6A, the base (feed chassis) 25 is fitted into the opening 12b of the tray (drawer case) 12. At this time, the lower cover 13 and the tray (drawer case) As shown in FIG. 4 and FIG. Is established. This vibration isolator 30 is also called an insulator.

As shown in FIGS. 4 and 5, the base (feed chassis) 25 includes three insulators 3.
It has three insulator mounting portions 251 for mounting the respective 0s. These three insulator mounting portions 251 are connected to the tray (drawer case) 12 described above.
The boss 121 is provided at a position corresponding to the boss 121. Therefore, each insulator 30 is attached to the corresponding insulator attachment portion 251, and the boss 1
Tray (drawer case) 1 with 21 inserted
2 and the boss receiving portion 131 of the lower cover 13.

Anyway, base (feed chassis) 2
Since the vibration of the vip-up portion 23 and the turntable 24 attached to the tray 5 is absorbed by the vibration isolator (insulator) 30, the influence of the vibration during the sliding operation of the tray (drawer case) 12 is reduced.

However, as described above, the center of gravity of the optical disk is shifted (that is, the center of rotation of the optical disk is shifted from the center of gravity of the optical disk), or the optical disk is installed in a state inclined with respect to the turntable 24. In such a case, when the optical disk rotates at a high speed, the turntable 24 vibrates, and the vibration is generated by the base (feed chassis) 25, the vibration isolator (insulator) 30,
And, it is transmitted to the main chassis (outer case) 11 via the lower cover 13.

Therefore, the present invention provides an inexpensive vibration detecting means for directly detecting the vibration in the base (feed chassis) 25.

FIG. 1 schematically shows a vibration detecting means 40 according to an embodiment of the present invention. 2 to 7 described above.
Also, all or a part of the vibration detecting means 40 is illustrated.

The vibration detecting means 40 according to the present embodiment comprises:
It comprises a magnet 41 disposed on a base (feed chassis) 25 and a Hall element 42 disposed on the printed circuit board 17. When the tray (drawer case) 12 is stored in the main chassis (outer case) 11, the magnet 41 and the hall element 42 are located close to and opposed to each other as shown in FIG. 1. The magnet 41 is arranged so as to be inclined at an angle of 45 ° with respect to the Hall element 42. The magnet 41
Is attached to a protruding portion 252 protruding from the base (feed chassis) 25 to the printed circuit board 17 side.

In such a configuration, the turntable 24
When the base (feed chassis) 25 vibrates due to the high speed rotation of the optical disc Disc mounted thereon,
A change in the magnetic field generated from the magnet 41 caused by this vibration can be detected by the Hall element 42. Further, four magnets 41 are connected to the Hall element 42.
Since the base (feed chassis) 25 is inclined at 5 °, the vibration direction of the base (feed chassis) 25 (up-down direction (focus direction),
Regardless of the horizontal direction or the front-back direction (tracking direction),
The vibration can be detected. Further, since the magnet 41 and the Hall element 42 are inexpensive, an inexpensive vibration detecting means can be provided.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to the above-described embodiments. For example, in the above-described embodiment, the thin optical disk device
The case of a D-ROM drive has been described as an example, but the present invention is not limited to this, and a CD-R drive, a CD-RW drive, a DVD-ROM drive, a DVD-R drive, Of course, the present invention can be applied to a DVD-RAM drive device. Further, in the above-described embodiment, a Hall element is used as a magnetic sensor, but it goes without saying that another magnetic sensor such as an MR element may be used. In the above embodiment, the magnet 41 is set at 45 ° with respect to the magnetic sensor (Hall element) 42.
However, the inclination angle may be changed (adjusted) to an appropriate angle in accordance with the characteristics of the thin optical disk device. Further, in the above embodiment, the magnet 41 is arranged on the base (feed chassis) 25 and the Hall element (magnetic sensor) 42 is arranged on the printed circuit board 17; Needless to say, the magnetic sensor may be arranged on the circuit board and the magnetic sensor may be arranged on the feed chassis. The magnet or the magnetic sensor attached to the feed chassis may be attached indirectly (for example, to the motor base 21).

[0036]

As is apparent from the above description, according to the present invention, the vibration of the feed chassis can be directly detected with high accuracy by using the vibration detecting means using the magnet and the magnetic sensor. Further, since the magnet and the magnetic sensor are inexpensive, an inexpensive vibration detecting means can be provided. Furthermore, by arranging the magnet at an angle with respect to the magnetic sensor, the vibration of the feed chassis can be detected regardless of the vibration direction (focus direction, tracking direction) of the feed chassis.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a thin optical disk device provided with a vibration detecting unit according to an embodiment of the present invention.

FIGS. 2A and 2B are schematic diagrams showing the thin optical disk device in FIG. 1 in a state in which a tray (drawer case) is pulled out from a main chassis (outer case), wherein FIG. 2A is a plan view and FIG. is there.

FIGS. 3A and 3B are schematic diagrams showing the thin optical disk device in FIG. 1 in a state in which a tray (drawer case) is housed in a main chassis (outer case), wherein FIG. 3A is a plan view and FIG. FIG. 3C is a front view.

FIG. 4 is a plan view showing a drive unit (feed assembly) used in the thin optical disk device shown in FIG.

FIG. 5 is a bottom view of FIG. 4;

FIG. 6 is a view showing a state in which a tray (drawer case) in a state where the base (feed chassis) of the drive unit (feed assembly) shown in FIGS. 4 and 5 is fitted in an opening, and a lower cover is removed; (A) is a bottom view and (b) is a front view.

7 is a view showing a state in which a lower cover is attached to the tray (drawer case) shown in FIG. 6, (a) is a bottom view,
(B) is a left side view.

[Explanation of symbols]

 11 Main Chassis (Outer Case) 12 Tray (Drawer Case) 13 Lower Cover 17 Printed Circuit Board 25 Base (Feed Chassis) 30 Vibration Isolator (Elastic Member, Insulator) 40 Vibration Detector 41 Magnet 42 Hall Element (Magnetic Sensor)

Claims (7)

[Claims] 1. A thin optical disk device of a type in which a disk drive / reproducing mechanism is incorporated in a drawer case, an outer case capable of storing the drawer case, a lower cover covering the drawer case from below, A feed chassis mounted on an upper portion of the lower cover, a pickup unit movably mounted on the feed chassis, a turntable mounted on the feed chassis, and disposed between the lower cover and the drawer case. The thin optical disk device further includes a plurality of insulators for absorbing vibration in the feed chassis, and a printed circuit board fixedly installed in the outer case and mounting electronic components. Place the drawer on one and the other of the chassis and the printed circuit board. A position facing close to each other when the Akesu is housed in the outer case, respectively, thin optical disk apparatus characterized in that a magnet and a magnetic sensor. 2. The apparatus according to claim 1, wherein the magnet is disposed at a predetermined angle with respect to the magnetic sensor.
2. The thin optical disk device according to claim 1. 3. The method according to claim 2, wherein the predetermined angle is 45 °.
2. The thin optical disk device according to claim 1. 4. The thin optical disk device according to claim 1, wherein said magnetic sensor is a Hall element. 5. The thin optical disk device according to claim 1, wherein said magnetic sensor is an MR element. 6. The thin optical disk device according to claim 1, wherein the magnet is arranged on the feed chassis, and the magnetic sensor is arranged on the printed circuit board. 7. The thin optical disk device according to claim 1, wherein the magnet is arranged on the printed circuit board, and the magnetic sensor is arranged on the feed chassis.