JP2003199373A - Impact drive unit and recorder and/or reproducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow quality to be improved and a manufacturing cost to be reduced in an impact drive unit. <P>SOLUTION: The impact drive unit comprises a drive shaft 24, an electromechanical transducer 25 mounted at one end of the drive shaft 24 to axially expand or contract the drive shaft 24 in response to a drive pulse, and a movable unit 27 slidably supported to the shaft 24 and sliding axially of the shaft 24 by axially displacing the shaft 24, while the transducer 25 is expanded or contracted, in response to the drive pulse. The shaft 24 is integrally formed with the transducer 25. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact drive device using an electromechanical conversion element, and a recording and / or reproducing device equipped with such an impact drive mechanism.

[0002]

2. Description of the Related Art Conventionally, various disc players compatible with disc-shaped recording media such as optical discs and magneto-optical discs have appeared.

For example, a disc player that reproduces an information signal from an optical disc reproduces an information signal from a disc rotation drive mechanism that rotationally drives the optical disc and an optical disc that is rotationally driven by the disc rotation drive mechanism. An optical pickup, a support mechanism for movably supporting the optical pickup in the radial direction of the optical disc, and a drive mechanism for feeding and operating the optical pickup supported by the support mechanism in the radial direction of the optical disc are provided. The structure is mounted on the base of.

Among them, the disk rotation drive mechanism has a disk table on which an optical disk is placed and a spindle motor which rotationally drives the disk table. The optical pickup is an optical system in which a light beam emitted from a light source is condensed by an objective lens and applied to a signal recording surface of an optical disc, and a returning light beam reflected by the signal recording surface of the optical disc is received by a photodetector. Block and
A biaxial actuator for displacing the objective lens in a focusing direction parallel to the optical axis of the objective lens and a tracking direction orthogonal to the optical axis of the objective lens based on a detection signal detected by the photodetector is provided. is doing.
The support mechanism includes a support base that supports the optical pickup,
It has a main shaft and a sub shaft that support the support base so as to be movable in the radial direction of the optical disk. The drive mechanism rotatably drives a rack member provided on the support base, a gear group that meshes with the rack member, a gear group including a lead screw, etc., and drives the rack member along the main shaft and the auxiliary shaft. And a drive motor for moving in the direction.

In the disc player constructed as described above, when the optical disc is rotationally driven by the disc rotation drive mechanism, the optical pickup supported by the support mechanism is fed by the drive mechanism in the radial direction of the optical disc, and An information signal for the optical disc is reproduced by the pickup.

[0006]

By the way, in the conventional disc player, as the drive mechanism for feeding the above-mentioned optical pickup in the radial direction of the optical disc, the rotation drive by the drive motor is performed through the gear group and the rack member. A mechanism for converting to linear drive is generally used.

Therefore, in the conventional disc player,
Various drawbacks have been pointed out due to the large number of parts. Specifically, it is necessary to secure a space for arranging the drive motor, the gear group, the rack member, etc., which makes it difficult to further reduce the size of the disc player. In addition, the increase in the number of parts leads to an increase in the cost of parts and an increase in the number of assembling steps. Further, since the rotary drive is converted into the linear drive, the efficiency is poor and the power consumption is increased. Furthermore, the problem of noise generated from the drive motor, gear group, rack member, etc. has been pointed out.

In order to solve such a problem, it has been proposed to use an impact drive device using an electromechanical conversion element as a drive mechanism for moving the optical pickup in the radial direction of the optical disc.

Specifically, as shown in FIG. 8A, this impact drive device supports a movable portion 101 provided on the above-mentioned support base and the movable portion 101 slidably in the radial direction of the optical disc. Drive shaft 102 and an electromechanical conversion element 10 attached to one end of the drive shaft 102 and extending and contracting in the axial direction of the drive shaft 102 in response to a drive pulse.
3 and a fixing portion 104 that fixes one end of the electromechanical conversion element 103.

In the impact drive device, the electromechanical conversion element 103 is applied with a drive pulse in which a gradual increase in voltage and a rapid drop in voltage continue. In this case, when the drive pulse gradually increases in voltage, as shown in FIG. 8B, the electromechanical conversion element 103 gradually expands, and in conjunction with this, the drive shaft 102 gradually moves to one side in the axial direction. Is displaced to. At this time, the movable portion 101 moves together with the drive shaft 102 due to the frictional force acting between the movable portion 101 and the drive shaft 102. On the other hand, with a sudden voltage drop of the drive pulse, as shown in FIG. 8C, the electromechanical conversion element 103 contracts rapidly, and in conjunction with this, the drive shaft 102 rapidly moves to the other side in the axial direction. Displace. At this time, slippage occurs between the movable portion 101 and the drive shaft 102, and only the drive shaft 102 is displaced to the other side in the axial direction. As a result, the movable portion 101 is
The drive shaft 102 is in a so-called “displaced state” and relatively slides to one side in the axial direction.

Therefore, in the impact drive device, such a drive pulse is repeated and the electromechanical conversion element 103 is repeated.
Is applied to the movable part 10 while vibrating the drive shaft 102 in the axial direction due to expansion and contraction of the electromechanical conversion element 103.
1 can be continuously slid in the axial direction of the drive shaft 102, and accordingly, the support base on which the optical pickup is supported can be linearly driven in the radial direction of the optical disc.

By the way, in this impact drive device,
The drive shaft 102 and the electromechanical conversion element 103 are joined together with an adhesive or the like. Therefore, in the conventional impact drive device, the bonding strength between the drive shaft 102 and the electromechanical conversion element 103 varies due to changes in the amount of adhesive applied and the working environment during manufacturing, resulting in unstable quality. There was a problem that became. Also,
The process of joining the drive shaft 102 and the electromechanical conversion element 103 requires a long working time, resulting in a problem of increased manufacturing cost.

Therefore, the present invention has been proposed in view of such conventional circumstances, and an object thereof is to provide an impact drive device capable of improving quality and reducing manufacturing cost.

It is another object of the present invention to provide a recording and / or reproducing apparatus which is equipped with such an impact driving apparatus and which can improve quality and reliability.

[0015]

In order to achieve this object, an impact drive device according to the present invention is attached to a drive shaft and one end of the drive shaft, and in the axial direction of the drive shaft according to a drive pulse. The electromechanical conversion element that expands and contracts, and is slidably supported by the drive shaft, and the drive shaft is displaced in the axial direction while expanding and contracting the electric conversion element in response to the drive pulse, so that It is characterized in that it has a movable part that slides, and the drive shaft and the electromechanical conversion element are integrally formed.

As described above, in the impact drive device according to the present invention, since the drive shaft and the electromechanical conversion element are integrally formed, the joint strength between the drive shaft and the electromechanical conversion element is improved. Therefore, the manufacturing cost can be reduced.

Further, the recording and / or reproducing apparatus according to the present invention has a recording / reproducing means for recording and / or reproducing a signal to / from a disc-shaped recording medium, and a support base to which the recording / reproducing means is attached. A supporting means for movably supporting the support base in the radial direction of the disk-shaped recording medium, a movable part provided on the support base, and a drive for slidably supporting the movable part in the radial direction of the disk-shaped recording medium. A shaft and an electromechanical conversion element that is attached to one end of the drive shaft and that expands and contracts in the axial direction of the drive shaft according to a drive pulse, while expanding and contracting the electromechanical conversion element according to the drive pulse, An impact drive device that slides the movable portion in the axial direction of the drive shaft by displacing the drive shaft in the axial direction. And-mechanical conversion element is characterized in that it is integrally formed.

As described above, in the recording and / or reproducing apparatus according to the present invention, in the impact drive device, the drive shaft and the electromechanical conversion element are integrally formed, and the drive shaft and the electromechanical conversion element are joined together. By improving the strength, it is possible to improve the operation reliability when the movable part is slid in the axial direction of the drive shaft, and the support base to which the recording / reproducing means is attached can be properly moved in the radial direction of the disc-shaped recording medium. Can be moved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which the present invention is applied to a recording / reproducing apparatus for recording / reproducing information signals on / from a magneto-optical disk, which is a disk-shaped recording medium rotatably housed in a disk cartridge, A detailed description will be given with reference to the drawings.

The disc cartridge 2 used in the recording / reproducing apparatus 1 shown in FIG. 1 has a cartridge body formed by butting up a pair of upper half 2a and lower half 2b, and a magneto-optical disc 3 having a diameter of about 64 mm. Has a structure that is rotatably accommodated. Also, on the surfaces of the upper half 2a and the lower half 2b facing each other, recording / reproducing openings 4a, 4b are formed so that a part of the magneto-optical disk 3 is exposed to the outside over the inner and outer circumferences. . These recording / reproducing openings 4a, 4b allow the signal recording area of the magneto-optical disk 3 to be exposed outward over the inner and outer circumferences, and are large enough for the optical pickup 14 and the magnetic head 15 to be described later to enter. Is formed in.

A shutter member 5 for opening / closing the recording / reproducing openings 4a, 4b is slidably attached to the cartridge body. The shutter member 5 is a flat plate member that is bent in a substantially U-shape along the outer shape of the cartridge body, and has a recording / reproducing opening 4.
It is formed in a size sufficient to close a and 4b.
The shutter member 5 is slidably supported along the edge of the cartridge body between a position where the recording / reproducing openings 4a and 4b are opened and a position where the recording / reproducing openings 4a and 4b are closed.

A center hub (not shown) made of metal or the like is attached to the center of the magneto-optical disk 3, and the center hub is outwardly provided at the substantially center of the lower half 2b. An opening (not shown) for driving which faces is formed.

The recording / reproducing apparatus 1 includes an apparatus main body (not shown), a lid attached to the apparatus main body so as to be openable and closable, and a disc cartridge 2 of the apparatus main body when the lid is opened. A holder for holding the disc cartridge 2 between the inserting / removing position and the mounting position where the disc cartridge 2 of the apparatus body is mounted when the lid is in the closed state, and this holder is inserted. The base 10 is movably supported between the detached position and the device position.

The disc cartridge 2 is held by the holding portion of the holder so that the shutter member 5
Is slid so that the recording / reproducing openings 4a and 4b are opened. Then, the disc cartridge 2 is moved to the base 10 of the apparatus main body by opening the lid while being held by the holder.

The main body of the apparatus is a disk rotation drive mechanism 6 for rotationally driving the magneto-optical disk 3 housed in the disk cartridge 2 and an information signal for the magneto-optical disk 3 rotationally driven by the disk rotation driving mechanism 6. A recording / reproducing mechanism 7 for recording / reproducing and a support mechanism 8 for movably supporting the recording / reproducing mechanism 7 in the radial direction of the magneto-optical disk 3.
And an impact drive device 9 for moving the recording / reproducing mechanism 7 supported by the support mechanism 8 in the radial direction of the magneto-optical disk 3, which are mounted on a base 10.

The disk rotation drive mechanism 6 has a disk table 11 on which the magneto-optical disk 3 is placed, and a spindle motor 12 which drives the disk table 11 to rotate. Of these, the disk table 11 has its central portion attached to the rotary shaft 12a of the spindle motor 12, and the main surface facing the disk cartridge 2 is passed through an opening for driving the disk cartridge 2 so as to pass through the magneto-optical disk 3. A permanent magnet 13 that attracts the center hub of the above is attached. Spindle motor 12
Is attached to a substantially central portion of the base 10 and rotationally drives the magneto-optical disk 3 chucked on the disk table 11 described above.

The recording / reproducing mechanism 7 has an optical pickup 14 for irradiating a main surface of the magneto-optical disk 3 which is exposed from the recording / reproducing opening of the disk cartridge 2 to the outside during recording or reproduction. The magnetic head 1 is arranged so as to face the optical pickup 14 and applies an external magnetic field to the other main surface of the magneto-optical disk 3 which faces outward from the recording / reproducing opening of the disk cartridge 2 during recording.
5 and 5.

The optical pickup 14 is a light source for emitting a light beam to at least the magneto-optical disk 3 and a semiconductor laser (not shown), and the light beam emitted from the semiconductor laser is a signal of the magneto-optical disk 3. An optical block having an objective lens 16 for condensing on the recording surface, and a photodetector (not shown) for receiving the returning light beam reflected by the signal recording surface of the magneto-optical disk 3, and the photodetector. It has a uniaxial actuator (not shown) that displaces the objective lens 16 in the focusing direction parallel to the optical axis of the objective lens 16 based on the detected detection signal.

The magnetic head 15 is attached to the tip end portion of the head attachment arm 17 so as to be opposed to the objective lens 16 of the optical pickup 14 via the magneto-optical disk 3. The head mounting arm 17 is made of an elastically displaceable member, and is brought into contact with or close to the surface of the magneto-optical disk 3 opposite to the surface facing the optical pickup only during recording by a head lifting mechanism (not shown). Has been done.

As shown in FIGS. 2 and 3, the optical pickup 14 and the magnetic head 15 are arranged in an area S where the recording / reproducing openings 4a and 4b of the disk cartridge 2 are projected. An opening 10a corresponding to the recording / reproducing opening 4a is formed in the base 10.

The support mechanism 8 supports the optical pickup 14 and a support base 19 for supporting the magnetic head 15 attached to the tip of the head attachment arm 17 via the connecting arm 18, and the support base 19 as an optical source. It has a guide shaft 20 that supports the magnetic disk 3 so as to be movable in the radial direction.

The support base 19 is arranged so that the optical pickup 14 faces outward from the opening 10a formed in the base 10, while the guide shaft 20 is parallel to the radial direction of the magneto-optical disk 3. Both ends are fixedly supported by a pair of support members 21 and 21 provided around the opening 10a of the base 10. The support base 19 is integrally formed with a support portion 23 having a guide hole 22 through which the guide shaft 20 is inserted.

As shown in FIGS. 1, 2 and 4, the impact drive device 9 has a drive shaft 24 arranged in parallel with the guide shaft 20, that is, in parallel with the radial direction of the optical disk, and is integrated with the drive shaft 24. Electromechanical conversion element 25 formed on
And a fixed portion 26 for fixing one end of the electromechanical conversion element 25, and a movable portion 27 slidably supported in the axial direction of the drive shaft 24.

The drive shaft 24 has a length sufficient to move the support base 19 over the inner and outer circumferences of the magneto-optical disk 3, and an electromechanical conversion element 25 is embedded inside at one end thereof. It is integrally formed as described above.

The electromechanical conversion element 25 is called a piezo element or a piezoelectric element, and the speeds of expansion and contraction in the axial direction of the drive shaft 24 differ depending on the drive pulse from a drive circuit (not shown). Generate expansion and contraction displacement.

The fixing portion 26 is fixed as a balancer to the end of the electromechanical conversion element 25 opposite to the end to which the drive shaft 24 is attached, and is fixed inside the drive shaft 24 together with the electromechanical conversion element 25. It is provided so as to be embedded.

The impact drive device 9 is supported by a bracket 28 attached to the surface of the base 10 opposite to the surface facing the disk cartridge 2 by screwing or the like. Specifically, the bracket 2
The fixing portion 26 is fixedly supported at one end of the bracket 8 while the shaft hole 29 is formed at the other end of the bracket 28.
By inserting the other end of the drive shaft 24 into the drive shaft 24, the drive shaft 24 is supported so as to be slidable in the axial direction.

The movable portion 27 is composed of a pair of a first support piece portion 30 and a second support piece portion 31 provided on the support base 19. Of these, the first support piece 30 is
The support base 19 is formed so as to project toward the drive shaft 24 from the end portion of the support base 19 opposite to the support portion 23. On the other hand, the second support piece portion 31 is made of an elastically displaceable member, such as a leaf spring, and is attached to the support base 19 by screwing or the like while being cantilevered. And these first
The support piece portion 30 and the second support piece portion 31 are arranged to face each other, and by sandwiching the drive shaft 24 therebetween, the support piece portion 30 and the second support piece portion 31 are slidably supported in the axial direction of the drive shaft 24.

Therefore, the support base 19 is the support portion 2
While the guide shaft 20 is inserted through the guide hole 22 of 3,
Since the movable portion 27 is slidably supported in the axial direction of the drive shaft 24, the guide shaft 20 and the drive shaft 2 are
4 is movably supported in the axial direction, that is, in the radial direction of the magneto-optical disk 3.

Then, the impact drive device 9 expands and contracts the electromechanical conversion element 25 in accordance with the drive pulse,
The movable portion 27 is slid in the axial direction of the drive shaft 24 by displacing the drive shaft 24 in the axial direction. Thereby, the support base 19 can be linearly driven in the radial direction of the magneto-optical disk 3.

Specifically, in the impact drive device 9, when the support base 19 is linearly driven in the direction shown by the arrow A in FIG. 1, the electromechanical conversion element 25 is shown in, for example, FIG. A drive pulse having a pulse waveform in which a gentle voltage rise and a sharp voltage drop are continuous is applied.

In this case, the electromechanical conversion element 25 gradually expands due to the gradual voltage rise of the drive pulse, and in conjunction with this, the drive shaft 24 is gradually displaced in the direction indicated by the arrow A in FIG. At this time, the movable portion 27 moves in the direction shown by the arrow A in FIG. 1 together with the drive shaft 24 due to the frictional force acting between the movable portion 27 and the drive shaft 24. On the other hand, when the drive pulse suddenly drops, the electromechanical conversion element 25 rapidly contracts, and in conjunction with this, the drive shaft 24 rapidly displaces in the direction shown by the arrow B in FIG. At this time, slippage occurs between the movable portion 27 and the drive shaft 24, and only the drive shaft 24 is displaced in the direction indicated by the arrow B in FIG. As a result, the movable portion 27 is connected to the drive shaft 24.
On the other hand, it slides in the direction indicated by arrow A in FIG.

Therefore, in the impact drive device 9, the movable portion 27 is moved by axially vibrating the drive shaft 24 by repeatedly applying the drive pulse as shown in FIG. 5A to the electromechanical conversion element 25. The drive shaft 24 can be continuously slid in the direction indicated by the arrow A in FIG. 1, and the support base 19 can be linearly driven in the direction indicated by the arrow A in FIG.

On the other hand, in this impact drive device 9, when the support base 19 is linearly driven in the direction shown by the arrow B in FIG.
A drive pulse having a pulse waveform opposite to the above-described pulse waveform shown in FIG. 5A, in which a gentle voltage drop as shown in FIG.

In this case, the electromechanical conversion element 25 gently contracts due to the gradual voltage drop of the drive pulse, and in conjunction with this, the drive shaft 24 is gently displaced in the direction shown by the arrow B in FIG. At this time, the movable portion 27 moves in the direction shown by the arrow B in FIG. 1 together with the drive shaft 24 due to the frictional force acting between the movable portion 27 and the drive shaft 24. On the other hand, when the drive pulse suddenly increases in voltage, the electromechanical conversion element 25 expands rapidly, and in conjunction with this, the drive shaft 24 is rapidly displaced in the direction indicated by arrow A in FIG. At this time, slippage occurs between the movable portion 27 and the drive shaft 24, and only the drive shaft 24 is displaced in the direction indicated by the arrow A in FIG. As a result, the movable portion 27 is connected to the drive shaft 24.
On the other hand, it slides in the direction indicated by the arrow B in FIG.

Therefore, in the impact drive device 9, the drive pulse as shown in FIG. 5B is repeatedly applied to the electromechanical conversion element 25, and the drive shaft 24 is vibrated in the axial direction to move the movable portion 27. The drive shaft 24 can be continuously slid in the direction indicated by the arrow B in FIG. 1, and the support base 19 can be linearly driven in the direction indicated by the arrow B in FIG.

In the impact drive device 9, the frictional force acting between the drive shaft 24 and the movable portion 27 and the drive shaft 2 are used.
By adjusting the elastic force of the second support piece portion 31 with respect to 4, the friction force acting between the drive shaft 24 and the movable portion 27 causes the support base 19 to move in any direction in the moving direction even when it is not driven. It can be held in a stable position. Further, the impact drive device 9 has no backlash, can perform drive control with high resolution of nm order, and can perform silent drive in an ultrasonic range of 20 kHz or higher.

As described above, the impact drive device 9 has a simplified structure and a reduced number of parts as compared with the conventional mechanism for converting the rotational drive by the drive motor into the linear drive via the gear group and the rack member. By doing so, it is possible to achieve a large reduction in size.

Therefore, this impact drive device 9
As shown in FIGS. 2 and 3, together with the recording / reproducing mechanism 7 described above, the recording / reproducing openings 4a and 4b of the disk cartridge 2 can be arranged in the projected area S. As a result, in the recording / reproducing apparatus 1, the optical pickup 14 having a dimension in the thickness direction and the impact driving apparatus 9 which is greatly reduced in size may be arranged inside the disc cartridge 2 through the opening 4b of the lower half 2b. It is possible, and the overall thickness and size of the device can be further reduced. In addition, in the recording / reproducing apparatus 1, it is not necessary to cut a screw for driving the guide shaft 20 described above, and the guide shaft 20 can be formed thin. Therefore, the guide shaft 20 is connected to the recording / reproducing openings 4a, 4b of the disc cartridge 2 described above.
It is also possible to dispose it in the area S in which is projected, and the size of the entire apparatus can be further reduced.

By the way, in the impact drive device 9, as described above, the drive shaft 24 and the electromechanical conversion element 2 are used.
And 5 are integrally formed. As a result, the bonding strength between the drive shaft 24 and the electromechanical conversion element 25 is improved as compared with the conventional one in which the drive shaft 102 and the electromechanical conversion element 103 are bonded and integrated using an adhesive or the like. It is possible to stabilize the quality.

Therefore, in this impact drive device 9, the joint strength between the drive shaft 24 and the electromechanical conversion element 25 is improved to improve the operational reliability when the movable portion 27 is slid in the axial direction of the drive shaft 24. It is possible to improve, and it is possible to appropriately move the support base 19 supporting the recording / reproducing mechanism 7 in the radial direction of the magneto-optical disk 3.

In the impact drive device 9, the drive shaft and the electromechanical conversion element are integrally formed to reduce the number of parts and simplify the assembling man-hours, thereby significantly reducing the manufacturing cost. It is possible.

Further, as shown in FIG. 6, the impact drive device 9 may have a structure in which the drive shaft 24, the electromechanical conversion element 25, and the fixing portion 26 are integrally formed. In this case, it is possible to further reduce the number of parts and reduce the manufacturing cost.

Although not shown, the impact drive device 9 is formed by extending the drive shaft 24 from one end of the electromechanical conversion element 25 so that the drive shaft 24 and the electromechanical conversion element 25 are integrated. It may be a structure formed in.

Next, as shown in FIG. 7, the control unit 50 included in the recording / reproducing apparatus 1 will be described.

This control unit 50 generates R signals for generating various signals.
An F amplifier 51, a servo control circuit 53 that controls driving of each mechanism via a driver 52, a digital signal processor (hereinafter, referred to as DSP) 54 that performs digital signal processing, and a D that converts a digital signal into an analog signal. A / A converter 55, an A / D converter 56 that converts an analog signal into a digital signal, a digital interface 57 that inputs and outputs a digital signal, and a D-RAM (Dynam
ic Random Access Memory), a buffer memory 58 for controlling the drive of the magnetic head 15, an operation unit 60 operated by the user, a display unit 61 for displaying to the user, and a system. The system controller 62 includes a microcomputer (CPU) that controls the entire system.

The RF amplifier 51 performs a required arithmetic processing on the detection signal from the magneto-optical disk 3 detected by the optical pickup 14 during reproduction, thereby reproducing the reproduction signal RF.
Also, the tracking error signal TE, the focus error signal FE, and the like are generated, and the groove information GFM, which is the absolute position information recorded as the wobbling groove on the magneto-optical disk 3, is extracted.

The servo control circuit 53 is based on the focus error signal FE and the tracking error signal TE supplied from the RF amplifier 51, the track jump command and the access command from the system controller 62, and the impact drive device 9 and the spindle motor 12. Drive control of the optical pickup 14 and the like is performed.

Specifically, this servo control circuit 53 is
Focus error signal FE supplied from the F amplifier 51
Then, the amount of error from the target value in the focus direction is detected, and a control signal based on the detection result is supplied to the driver 52. Then, the driver 52 displaces the objective lens 16 in the focusing direction by applying a drive voltage according to the control signal to the uniaxial actuator of the optical pickup 14. As a result, a focusing operation for focusing the objective lens 16 on the signal recording surface of the magneto-optical disk 3 is performed.

Further, the servo control circuit 53 detects the error amount from the target value in the tracking direction from the tracking error signal TE supplied from the RF amplifier 51, and the control signal based on the detection result is sent to the driver 52. Supply. Then, the driver 52 applies a drive voltage according to the control signal to the impact drive device 9 to displace the support base 19 in the radial direction of the magneto-optical disk 3. As a result, a tracking operation is performed in which the spot of the light beam focused by the objective lens 16 is always positioned on the recording track of the magneto-optical disk 3.

Further, the servo control circuit 53 has a tracking error signal TE supplied from the RF amplifier 51,
In addition, a control signal based on a track jump command or an access command from the system control is generated, and this control signal is supplied to the driver 52. And driver 5
2 applies a drive pulse according to this control signal to the impact drive device 9 to displace the support base 19 in the radial direction of the magneto-optical disk. As a result, a feeding operation for moving the recording / reproducing mechanism 7 over the inner and outer circumferences of the magneto-optical disk 3 is performed.

Further, the servo control circuit 53 drives the spindle motor 12 to rotate at a constant linear velocity via the driver 52 and supplies a control signal based on a command from the system controller 62 to the driver 52. Drive control for starting or stopping the spindle motor 12 is performed. Further, the servo control circuit 53 supplies a control signal based on a command from the system controller 62 to the driver 52, so that the optical pickup 1
Turning on / off of the semiconductor laser in 4 and driving control of laser output and the like are performed.

The DSP 54 has an address decoder 63 to which the groove information GFM is supplied from the RF amplifier 51. The address decoder 63 has the RF decoder 51.
The address information is extracted by decoding the groove information GFM supplied from This address information is supplied to the system controller 62 and used for various drive controls.

Further, the DSP 54 has an EFM / CIRC encoder / decoder 64, a vibration-proof memory controller 65, and a voice compression encoder / decoder 66, and from the RF amplifier 51 to the EFM / CI at the time of reproduction.
A reproduction signal RF is supplied to the RC encoder / decoder 64, and an EFM (Eight to Four) is applied to the reproduction signal RF.
CI for demodulation and error correction
Decoding processing such as RC (Cross Interleave Reed-Solomon Code) is performed. As a result, the compressed data signal is extracted, and the extracted data signal is stored in the buffer memory 5 by the vibration-proof memory controller 65.
8 is written. Then, the data signal once written in the buffer memory 58 is read for each predetermined data unit and supplied to the audio compression encoder / decoder 66, and an ATRAC (Adaptive) is applied to this data signal.
Decoding processing by Transform Acoustic Coding) is performed. This causes the compression to be decompressed into a digital audio signal.

This digital audio signal is converted into an analog audio signal by the D / A converter 55 and then output from the audio output terminal 67. Also,
This digital audio signal can also be directly output from the digital output terminal 69 via the digital interface 57.

On the other hand, during recording, the audio input terminal 6
The analog audio signal input from 8 is converted into a digital audio signal by the A / D converter 56, and then supplied to the audio compression encoder / decoder 66. Further, in this recording / reproducing apparatus 1, a digital audio signal can be directly input from the digital output terminal 70 via the digital interface 57.

In the DSP 54, the digital audio signal supplied to the audio compression encoder / decoder 66 is converted into a compressed data signal by the ATRAC encoding process, and the vibration-proof memory controller 65 causes the buffer memory 58. Written to. Then, the data signal once written in the buffer memory 58 is read out for each predetermined data unit and supplied to the EFM / CIRC encoder / decoder 64, which relates to the EFM modulation and the error correction for this data signal. It is supplied to the head drive circuit 59 after encoding processing such as CIRC is performed.

The head drive circuit 59 causes the magnetic head 15 to generate an external magnetic field modulated according to the data signal subjected to the encoding process. At this time, the head elevating mechanism brings the magnetic head 15 into contact with or close to the surface of the magneto-optical disk 3 opposite to the surface facing the optical pickup 14 based on a command from the system controller 62. Further, the servo control circuit 53, based on a command from the system controller 62, causes the driver 52 so that the semiconductor laser outputs a light beam whose irradiated portion has a Curie temperature or higher with respect to the signal recording surface of the magneto-optical disk 3. The optical pickup 14 is driven via. This allows
The compressed digital signal is recorded on the magneto-optical disk 3.

The operation section 60 is composed of operation switches, operation buttons, etc., for example, for reproduction, recording, pause,
Operation information related to recording or playback operations such as stop, fast forward, fast rewind, cue search, normal playback, program playback,
Operation information related to a play mode such as shuffle reproduction is supplied to the system controller 62.

The display section 61 is composed of a liquid crystal display panel or the like, and the magneto-optical disk 3 at the time of recording or reproduction.
The operation mode status, track number, recording time or playback time, editing operation status, etc. are displayed.

The system controller 62 has an operating section 60.
The operation control of each unit according to the operation information supplied from the unit is executed, and the display unit 61 is caused to execute the display operation.

In the recording / reproducing apparatus 1 configured as described above, the drive shaft 2 is used in the above-mentioned impact drive apparatus 9.
4 and the electromechanical conversion element 25 are integrally formed, and the joint strength between the drive shaft 24 and the electromechanical conversion element 25 is improved, so that the movable portion 27 is slid in the axial direction of the drive shaft 24. It is possible to improve reliability. Therefore, in this recording / reproducing apparatus 1, since the support base 19 supporting the recording / reproducing mechanism 7 can be appropriately moved in the radial direction of the magneto-optical disk 3,
It is possible to appropriately record and reproduce the information signal with respect to the magneto-optical disk 3.

Further, in the recording / reproducing apparatus 1, since the impact driving apparatus 9 can appropriately perform the tracking operation and the feeding operation described above, the objective lens 16 is driven by the uniaxial actuator of the optical pickup 14 described above. It is possible to greatly simplify the structure of the optical pickup 14 by setting only the focus direction by.

Further, in the recording / reproducing apparatus 1, it is not necessary to correct the detection signal in consideration of the offset due to the field swing of the objective lens 16 as in the conventional case, and the tracking servo by the one-spot optical system can be easily applied. You can Therefore, in this recording / reproducing apparatus 1, it is possible to simplify the mechanism and the like for performing the above-mentioned tracking operation, and it is possible to greatly improve the reliability.

Further, in the recording / reproducing apparatus 1, the manufacturing cost can be greatly reduced by reducing the number of parts and the number of assembling steps, and the driving time of the battery can be extended by reducing the power consumption. is there.

The present invention is based on the recording / reproducing apparatus 1 described above.
As described above, the present invention is not limited to the one for recording / reproducing information signals on / from the magneto-optical disk 3 rotatably housed in the disk cartridge 2, and for example, C
D (Compact Disk), CD-R (CD-Recordable), CD-
RW (CD-ReWritable), DVD (Digital Versatile Dis)
It is widely applicable to a recording and / or reproducing device for recording and / or reproducing a signal on an optical disc such as k).

[0077]

As described in detail above, in the impact drive device according to the present invention, the drive shaft and the electromechanical conversion element are integrally formed, so that the joint strength between the drive shaft and the electromechanical conversion element is increased. The manufacturing cost can be reduced by reducing the number of parts and simplifying the number of assembling steps.

Further, in the recording and / or reproducing apparatus according to the present invention, by providing such an impact driving device, the supporting base to which the recording / reproducing means is attached can be appropriately moved in the radial direction of the disc-shaped recording medium. Therefore, it is possible to appropriately record and / or reproduce signals on the disc-shaped recording medium.

[Brief description of drawings]

FIG. 1 is a perspective view showing a recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a plan view showing the recording / reproducing apparatus.

FIG. 3 is a cross-sectional view of the recording / reproducing device as seen from the thickness direction.

FIG. 4 is a cross-sectional view showing a configuration example of an impact drive device to which the present invention has been applied.

5 is a waveform diagram of a drive pulse applied to the electromechanical conversion element, and FIG. 5A is a waveform diagram of the drive pulse when the support base is moved in a direction indicated by an arrow A in FIG.
(B) is a waveform diagram of a drive pulse when the support base is moved in a direction indicated by an arrow B in FIG. 1.

FIG. 6 is a cross-sectional view showing another configuration example of an impact drive device to which the present invention has been applied.

FIG. 7 is a block diagram showing a control unit of the recording / reproducing apparatus.

FIG. 8 is a schematic diagram for explaining the operation principle of the impact drive device, in which (a) shows an initial state and (b).
Indicates a state where the electromechanical conversion element is extended, (c)
Indicates a state in which the electromechanical conversion element is contracted.

[Explanation of symbols]

1 recording / reproducing device, 2 disc cartridge, 3 magneto-optical disc, 4a, 4b recording / reproducing opening, 6
Disk rotation drive mechanism, 7 recording / reproducing mechanism, 8 support mechanism, 9 impact drive device, 10 base, 10a
Opening, 11 disk table, 12 spindle motor, 14 optical pickup, 15 magnetic head, 16
Objective lens, 19 support base, 20 guide axis, 24
Drive shaft, 25 electromechanical conversion element, 26 fixed portion, 2
7 Movable part, 28 Bracket, 30 1st support piece part, 31 2nd support piece part, 50 Control part

Claims (4)

[Claims] 1. A drive shaft, an electromechanical conversion element that is attached to one end of the drive shaft, and expands and contracts in the axial direction of the drive shaft in response to a drive pulse, and is slidably supported by the drive shaft. A movable portion that is slid in the axial direction of the drive shaft by displacing the drive shaft in the axial direction while expanding and contracting the electric conversion element according to the drive pulse; and the drive shaft and the electromechanical conversion device. An impact drive device characterized by being formed integrally with an element. 2. An electromechanical conversion element, comprising a fixing portion attached to an end portion opposite to an end portion to which the drive shaft is attached, wherein the drive shaft, the electromechanical conversion element and the fixing portion are provided. The impact drive device according to claim 1, wherein the impact drive device is integrally formed. 3. A recording / reproducing means for recording and / or reproducing a signal to and from a disc-shaped recording medium, and a support base to which the recording / reproducing means is attached.
Support means for supporting the support base so as to be movable in the radial direction of the disc-shaped recording medium, a movable portion provided on the support base, and a support for the movable portion slidable in the radial direction of the disc-shaped recording medium. And a drive shaft attached to one end of the drive shaft, and an electromechanical conversion element that expands and contracts in the axial direction of the drive shaft in response to a drive pulse, and expands and contracts the electromechanical conversion element in response to the drive pulse. However, an impact drive device that slides the movable portion in the axial direction of the drive shaft by displacing the drive shaft in the axial direction is provided, and in the impact drive device, the drive shaft and the electromechanical conversion element. The recording and / or reproducing apparatus is characterized by being integrally formed. 4. The impact drive device has a fixing portion attached to an end portion of the electromechanical conversion element opposite to an end portion to which the drive shaft is attached, the drive shaft, the electric machine. The recording and / or reproducing apparatus according to claim 3, wherein the conversion element and the fixing portion are integrally formed.