JP3306908B2 - Optical disk rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk rotation drive apparatus applied to a so-called compatible optical disk player capable of recording and / or reproducing two different types of optical disks.

[0002]

2. Description of the Related Art At present, as a sound system using a disk as a recording medium, an optical disk having a diameter of 12 cm called a compact disk (CD) has been widely used.
On the other hand, recently, a small optical disk called a mini disk (MD) smaller in diameter than the compact disk has been proposed. So this mini disk (MD)
There is a demand for a so-called compatible type disc player capable of reproducing (or recording) any of a disc and a compact disc (CD). In this type of compatible disc player proposed to date, an optical system for reading (or writing) a signal is shared by a mini disc (MD) and a compact disc (CD).
A motor as a drive source for rotating a disk is used exclusively for a mini disk (MD) and a compact disk (CD), that is, a structure having an independent rotation drive system is generally used.

[0003]

As described above, in the conventional compatible disc player, the mini disc (M
Since two motors are provided for D) and a compact disk (CD), space efficiency is poor, which is a major obstacle to miniaturization, and disadvantageous in cost.

[0004]

In order to solve the above-mentioned problems, the apparatus of the present invention is mounted on a rotating shaft of a motor, and a small-diameter optical disk housed in a disk cartridge is placed thereon and the small-diameter optical disk is chucked. A first disk table having a chucking magnet for king, a large diameter that is inserted coaxially with the first disk table through the rotation shaft of the motor, and is engaged with the first disk table; A second disk table on which the first optical disk is mounted, and a centering portion provided in the center portion for engaging with the center hole of the large-diameter optical disk, and a clamper unit for chucking the large-diameter optical disk together with the second disk table. And whether the loaded optical disk is a large-diameter disk or a small-diameter disk. Means for rotatably supporting the second disk table, and a lower position in which the second disk table engages with the first disk table and a lower position in which engagement with the first disk table is released. The first arm that moves between the two and the clamper part are rotatably supported,
An operating mechanism having a second arm for moving the clamper portion together with the second disk table to a position for chucking the large-diameter optical disk, wherein the operating mechanism is provided when the mounted optical disk is a small-diameter optical disk.
The small-diameter optical disk placed on the first disk table is chucked by the chucking magnet,
When the optical disk to be mounted is detected as a large-diameter optical disk by the detecting means, the second disk table is moved from the lowered position to the raised position by the first arm to move the second disk table to the first disk. The structure is such that a large-diameter optical disk is chucked by the second disk table and the clamper by moving the clamper with the second arm while engaging with the table.

[0005]

In the apparatus of the present invention configured as described above, the small-diameter disk and the large-diameter disk are driven by one motor, so that the space can be saved as compared with the conventional two-motor structure. This enables downsizing and also leads to cost reduction.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. In this example, the mini disc (M
D) is a structure of a disk rotation drive device applied to a compatible disk player capable of playing both a compact disk (CD) and a compact disk (CD). Before describing the structure of this disc player, the structure of the mini-disc (MD) and the compact disc (CD) will be briefly described. First, the mini-disc (MD) 100 has an outer diameter of φ64,
It is housed in a plastic cartridge 101 and has a center hole 102 of φ11 at the center, a clamping area of φ11 to 17, and a lead-in of φ30. A metal plate 103 for magnet chucking is fixed on the upper surface of the mini disc (MD) 100 so as to close the center hole 102 at the center. Meanwhile, compact disc (CD) 2
00 has an outer diameter of φ120, and has a center hole 201 of φ15 at the center thereof, and the clamping area is φ26 to φ26.
33, the lead-in is φ46.

[0007] The disc player of this embodiment, which can handle both the mini disc (MD) and the compact disc (CD), is basically a mini disc (MD).
And a chucking mechanism for a compact disk (CD) is added to the chucking mechanism for the disc. First, the structure of a chucking mechanism for a mini-disc (MD) will be described. In FIG. 1, reference numeral 1 denotes a motor as a disc drive source, and a rotary drive shaft 2 of the motor 1 extends vertically upward and has a mini-tip at its tip. A first disk table 3 on which a disk (MD) is placed is mounted. The first disk table 3 is provided with a tapered centering cap 4 at the center thereof, and a magnet 5 for magnet chucking is mounted at the center of the centering cap 4.

Next, the structure of the chucking mechanism for a compact disk (CD) will be described. First, the first and second arms, that is, the lower arm 7 and the upper arm 6, are moved up and down around the support shafts 7c and 6c, respectively. And one end 7a of the lower arm 7
A second disk table 8 on which a compact disk (CD) is mounted is composed of a compression coil spring 9 and a bearing 1.
It is rotatably mounted via a zero. The second disk table 8 is arranged coaxially with the first disk table 3, that is, the second disk table 8 has a hole 11 in the center, and the rotary drive shaft of the motor 1 2 extends upward through the hole 11 and the hole 12 of the lower arm 7. Teeth 13 are formed in the hole 11 in a mortar shape. When the lower arm 7 is rotated by an operation mechanism described later and the second disk table 8 is raised, the teeth 13 are moved to the first disk table. 3 is engaged with the teeth 14 formed on the outer peripheral surface.

On the other hand, the upper arm 6 has one end 6a,
The clamper 1 faces the second disk table 8.
5 are attached. The clamper 15 is rotatably supported with a predetermined play in a mounting hole 17 of the upper arm 6 via a shaft 16, and a tapered centering cap 18 is provided at the center thereof. It has a metal plate 19 located at the center. Also, the axis 1 of this clamper 15
The tip 16a of the upper arm 6 is formed so as to protrude greatly downward from the metal plate 19, and as described later,
When the clamper 15 is lowered by tilting, the tip 16a of the shaft 16 is inserted and fitted into a centering hole 20 provided at the center of the first disk table 3.

A tension coil spring 21 is stretched between the other end 6 b of the upper arm 6 and the other end 7 b of the lower arm 7. The arms 7 are biased in a direction in which the clamper 15 moves up and in a direction in which the second disk table 8 moves down. Reference numerals 22 and 23 denote stoppers. The upper arm 6 and the lower arm 7 come into contact with the stoppers 22 and 23, respectively, so that the upper arm 6 and the lower arm 7 are stopped and held at predetermined positions. .

Reference numeral 24 denotes an operating mechanism for operating the upper arm 6 and the lower arm 7, that is, the operating mechanism 24 includes inner surfaces of the other ends 6a and 7a of the upper arm 6 and the lower arm 7, respectively. Slide cam plate 25 slidably in contact with
And a motor 26 as an operation source of the slide cam plate 25. The driving force of the motor 26 is transmitted to the rack portion 25a of the slide cam plate 25 via gears 27, 28, and 29. Slide cam plate 25
Is slid. Then, the slide cam plate 25 slides outward, that is, in the direction approaching the extension coil spring 21, and simultaneously presses the inner surfaces of the other end portions 6a and 7a of the upper arm 6 and the lower arm 7, respectively. And the lower arm 7 are each rotated so as to be opposed to the force of the extension coil spring 21.

Reference numerals 30 and 31 denote stop switches for stopping the movement of the slide cam plate 25 at the moving end of the slide cam plate 25. That is, the stop switches 30 and 31 are pushed by the slide cam plate 25 to turn on the power ( ON)
As a result, the operation of the motor 26 is stopped.

Reference numerals 32 and 33 denote light emitters and light receivers as detecting means for detecting whether the disk is a mini disk (MD) or a compact disk (CD), that is, light emitted from the light emitter 32. The disc is distinguished from a mini disc (MD), which is a small-diameter disc, and a compact disc (CD), which is a large-diameter disc, depending on whether or not light is received by the photoreceptor 33.

Reference numeral 34 denotes an optical head for reproducing a signal from a disk (or recording a signal on the disk).
The optical head 34 is moved in the radial direction of the disk by an optical head feeding mechanism (not shown) with the rotation of the disk, and a signal is read (or written) by a laser beam applied to a signal recording surface of the disk. . The optical head 34 is a mini disk (MD)
And a compact disc (CD).

In the disk player of this embodiment configured as described above, first, in a normal state, that is, in a standby state, the upper arm 6 and the lower arm 7 abut against the stoppers 22 and 23, respectively, and the clamper 15 and the second disk table 8 Is the first
Is located far away from the disk table 3.

In this state, the mini disc (MD) 1
When the cartridge 101 containing the “00” is inserted and set at a predetermined mounting position (see FIGS. 1 and 3), the mini disc (MD) 100 is placed on the first disc table 3 and is placed on the centering cap 4. Center Hall 1
02 is fitted and centering is performed, and at the same time, the metal plate 103 is magnetically attracted to the magnet 5 to perform chucking.

Then, the mini disk (M
D) When the chucking of the disc 100 is completed, the mini disc (MD) 100 on the first disc table 3 is rotated by the drive of the motor 1, and at the same time, the optical head 34 is moved to the position of the lead-in (φ30) of the disc. The recording (reproducing (or recording)) is performed by moving toward the outer periphery of the disk while reading the signal (or writing the signal) by the laser beam irradiated from the position to the signal recording surface of the disk from this position. .

On the other hand, a compact disk (CD) 200
(See FIGS. 2 and 4), the light emitted from the light emitter 32 of the sensor is blocked by the compact disk (CD) 200 having a larger diameter than the mini disk (MD) 100 and When it does not reach, the motor 26 of the operating mechanism 24 is driven by using this as a signal, and the slide cam plate 25 is slid in the outward direction, that is, in the direction approaching the extension coil spring 21. For this reason, the upper arm 6 and the lower arm 7 are
Is pressed symmetrically against the force of the extension coil spring 21, whereby the clamper 15 is lowered and the second disk table 8 is raised.

When the second disk table 8 is lifted in this manner, the second disk table 8
The compact disc (CD) 200 is placed on the first disc table 8, and the teeth 13 of the hole 11 of the second disc table 8 mesh with the teeth 14 on the outer periphery of the first disc table 3. 3 and the second disk table 8 are rotated integrally. At this time, the second disk table 8 is compressed by the compression coil spring 9.
Is pressed against the first disk table 3, so that both disk tables 3 and 8 are reliably integrated.
On the other hand, when the clamper 15 is lowered, first, the tip 16a of the shaft 16 is inserted and fitted into the centering hole 20 at the center of the first disk table 3, whereby the rotation center of the clamper 15 is aligned (centering). At the same time, the metal plate 19 of the clamper 15 is
Is magnetically attracted to the magnet 5. Thus, the centering cap 18 of the clamper 15 is attached to the compact disc (CD) 20 by the suction of the clamper 15.
The centering is performed by fitting into the center hole 201, and the chucking is performed with the clamper 15 sandwiching the compact disk (CD) 200 with the second disk table 8. still,
In the chucking state of the compact disk (CD) 200 and the chucking state of the mini-disc (MD) 100, the height of the signal recording surface of the disk, that is, the distance to the optical head 34 is equal. .

When the chucking of the compact disk (CD) 200 is completed as described above, the motor 1 is operated to rotate the second disk table 8 integrally with the first disk table 3, whereby the second disk table 8 is rotated. Compact disk (CD) 200 on the second disk table 8
Is driven to rotate, and at the same time, the optical head 34 moves to the position of the lead-in (φ46) of the disk, and heads toward the outer periphery of the disk while reading a signal from this position by a laser beam applied to the signal recording surface of the disk. The reproduction is performed by being moved.

As described above, the disc player of the present embodiment can handle both mini discs (MD) 100 and compact discs (CD) 200 having different diameters. The disc player includes a mini disc (MD) 100 and a compact disc (CD) 2
00 is driven by a common single motor 1, which is smaller than a conventional two-motor disc player having a dedicated motor for each of a mini disc (MD) and a compact disc (CD). And the configuration is simple. Therefore, space efficiency is higher than before, that is, space saving is achieved, miniaturization is possible, and cost is also advantageous.

Although the embodiment of the present invention has been described above, the present invention is not limited to the configuration of this embodiment.

[0023]

As described above, according to the present invention, when the disc to be mounted is a small-diameter optical disc, the small-diameter optical disc mounted on the first disc table is chucked by the chucking magnet. When the detecting means detects that the disc to be mounted is a large-diameter optical disc, the first arm moves the second disc table from the lowered position to the raised position to move the second disc table to the first disc. While being engaged with the disk table, the clamper is moved by the second arm, and the large-diameter optical disk is chucked by the second disk table and the clamper. As a result, in the apparatus of the present invention, when the optical disk to be mounted is a large-diameter optical disk, the second disk table is engaged with the first disk table, and the first disk table and the second disk table are integrated. Therefore, a single motor can be driven to rotate regardless of the diameter of the large and small optical disks, and the device can be downsized. In addition, the second disk table is related to the first disk table. If the position accuracy of the first disk table in the height direction or the plane direction is obtained, the position accuracy of the second disk table can be obtained automatically. As described above, the apparatus of the present invention can provide the first disk table and the second disk table coaxially with high precision. Therefore, when the first disk table and the second disk table are integrally rotated. Even if there is, the amount of eccentricity does not increase.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment, showing a state in which a mini disc (MD) is driven.

FIG. 2 is a side view of the embodiment, showing a compact disc (C
This is the state at the time of driving of D).

FIG. 3 is a front view of the embodiment, showing a state in which a mini disc (MD) is driven.

FIG. 4 is a front view of the embodiment, showing a compact disc (C
This is the state at the time of driving of D).

[Explanation of symbols]

 Reference Signs List 1 motor (drive source) 3 first disk table 6 upper arm 7 lower arm 8 second disk table 15 clamper 24 operating mechanism 100 mini disk (small diameter disk) 200 compact disk (large diameter disk)

Claims (2)

(57) [Claims] 1. A attached to a rotating shaft of the motor, disc
A first disk table on which a small-diameter optical disk housed in a cartridge is placed and which has a chucking magnet for chucking the small-diameter optical disk; A second disk table on which a large-diameter optical disk is placed coaxially with the disk table and is engaged with the first disk table; and a center hole of the large-diameter optical disk in the center. A centering unit is provided to fit the second disk table, and a clamper unit for chucking a large-diameter optical disk together with the second disk table, and detects whether the mounted optical disk is the large-diameter disk or the small-diameter disk. Detecting means for rotatably supporting the second disk table; A first arm for moving the table between a raised position for engaging the first disk table and a lowered position for disengaging from the first disk table; and a rotatable clamper unit. And a second arm that supports and moves the clamper unit together with the second disk table to a position where the large-diameter optical disk is chucked. The operating mechanism comprises: Is a small-diameter optical disk, the small-diameter optical disk mounted on the first disk table is chucked by the chucking magnet, and the optical disk mounted by the detection means is a large-diameter optical disk. Is detected, the first arm moves the second disk table from the lowered position. The second disk table is moved to the first position by moving the second disk table to the first position.
An optical disk rotation drive device that engages with the disk table of the above, moves the clamper by the second arm, and chucks a large-diameter optical disk by the second disk table and the clamper. 2. The apparatus according to claim 1, wherein the clamper further includes a metal plate, and the metal plate is attracted by the chucking magnet.