JPH05274834A - Head driving device - Google Patents

Abstract

PURPOSE:To provide a head driving device whose magnetic head is constituted so as to abut on the upper surface of a read-only disk by driving the read-only disk when a player capable of recording/reproducing the read-only disk and a DRAW type disk is gained and automatically moving up the magnetic head by detecting that when it is turned to a reproducing condition. CONSTITUTION:A type identification hole 38a or 38b capable of identifying a disk type is provided on either a disk cartridge 1 or 20 housing the read-only disk, or the DRAW type disk. By detecting this identification hole and based on this identification result, a magnetic head supporting arm 47 attached with a magnetic head 46 is moved up when a read-only disk cartridge is inserted and when the DRAW type disk cartridge is inserted, the magnetic head 46 is abutted on the upper surface of a disk 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drive device for a disc player which records and reproduces a read-only disc and a write-once or rewritable disc.

[0002]

2. Description of the Related Art Conventionally, as a read-only disc, as shown in FIG. 4, a disc cartridge for a CD-ROM in which a CD having a diameter of 8 cm is rotatably accommodated is known.

As shown in FIG. 4, such a disc cartridge for a CD-ROM has an upper half 2 and a lower half 3 which are formed by molding a synthetic resin, for example, and have a substantially flat plate shape and a rectangular shape. In the cartridge body 1 formed by butt-joining each other, a disc-shaped recording medium, for example, C
An optical disk 4 such as a D-ROM is rotatably housed.

A chucking portion provided at the center of the optical disk 4 housed here extends outward from the center of the upper half 2 and the lower half 3 constituting the cartridge body 1 to the front edge direction. The signal recording surface of the optical disk 4 is exposed to the outside, and the openings 7 and 8 facing the information signal reading means such as an optical head for reading the information signal written to the optical disk 4 are opened in a substantially rectangular shape. Has been done.

Further, a substantially U-shaped shutter 9 for opening and closing the openings 7, 8 is slidably attached to the cartridge body 1. The shutter 9 is formed by bending a metal plate such as a stainless plate.

On the opposite side surfaces of the upper and lower halves 2 and 3,
Side wall 1 of cartridge body 1 butted against each other
The rising walls 11 forming the reference numerals 2 and 13 are formed on three side surfaces, but the rear surface side opposite to the front surface side to which the shutter 9 is fitted is open without the rising wall 11 being provided. The rear surface side of the cartridge body 1 formed by abutting and coupling the upper and lower halves 2 and 3 formed in this way is an opening opened over substantially the entire width, and is housed in the cartridge body 1 with this opening. It is used as a disc insertion / removal opening for inserting / removing the optical disc 4.

In the cartridge body 1, an insertion / removal opening / closing member 16 for opening / closing the disk insertion / removal opening is formed of synthetic resin, and if the holding portion 15 is held and rotated in the clockwise direction in FIG. It is configured so that the optical disc 4 can be put in and taken out by opening it at the center.

FIGS. 5 and 6 show, for example, a 3.5-inch magneto-optical disk (hereinafter referred to as M
A reference numeral 20 denotes a disk cartridge that rotatably accommodates 23), and 20 is an MO cartridge main body, and a pair of upper half 21 and lower half 22 are butted to form a substantially flat plate rectangular shape. It is configured.

As shown in FIG. 5, an opening 25 for a magnetic head device is formed in the upper main surface of the cartridge main body 20 so as to expose a part of the upper main surface serving as the recording surface of the MO 23 to the outside along the inner and outer circumferences. It is provided. Further, as shown in FIG. 6, the lower main surface portion is formed so as to face the opening 25 for the magnetic head device so as to cover the inner and outer circumferences of a part of the lower main surface portion which serves as a signal recording surface of the MO 23. An opening 24 for the optical pickup device is provided for exposing the extending portion and the central portion of the MO 23, which is the chucked portion, to the outside. A shutter 27 for opening and closing the openings 24, 25 is attached to the cartridge body 20. The shutter 27 includes an upper shutter plate portion 28 for closing the magnetic head device opening 25, a lower shutter plate portion 29 for closing the optical pickup device opening 24, and
The shutter plate portions 28, 29 have a connecting plate portion 30 for connecting the base end sides thereof, and are integrally formed of a metal or a synthetic resin material in a substantially U-shaped cross section.

A guide groove 31 for movably supporting the shutter connecting plate portion 30 is provided on the front surface of the cartridge body 20. The shutter plates 28 and 29 are moved along the guide groove 31 to open and close the magnetic head device opening 25 and the optical pickup device opening 29.

Numerals 32a and 32b are positioning holes into which positioning pins of the drive mechanism are inserted, and numerals 33a and 33b are used to load the cartridge body 20 of the MO 23.
It is a positioning hole for positioning the cartridge body 20 in the height direction when loading is completed.

[0012]

DISCLOSURE OF THE INVENTION Conventionally, there has been known a disc player adapted to exclusively reproduce a read-only disc, for example, an 8 cm CD-ROM described in FIG.

Similarly, a disc player configured to record and reproduce an MO23 which is a write-once or rewritable disc as shown in FIGS. 5 and 6 is well known. In this player, the optical pickup is irradiated with laser light from the lower surface of the cartridge main body 20 shown in FIG. 6 from the lower surface of the MO 23 through the opening 24 for the optical pickup device,
Writing or the like is performed by bringing the magnetic head into contact with the upper surface of the MO 23 through the opening 25 for the magnetic head device.

Although no disc player capable of reproducing both of these cartridges at the same time is commercially available, there is a strong demand for providing a player capable of recording and reproducing both of these discs.

The magnetic head for the MO 23 used when reproducing the 8 cm CD-ROM 4 in the case of making a disc player which meets such a demand is an 8 cm CD-ROM.
However, there is a problem in that the surface of the disk 4 is damaged by being brought into contact with the upper surface of the disk 4, and the reproduction capability of the 8 cm CD-ROM is reduced.

The present invention has been made in order to solve the above problems, and its purpose is to provide a read-only disc when a player capable of recording or reproducing a read-only disc and a write-once or rewritable disc is obtained. Provided is a head drive device configured to prevent the magnetic head from coming into contact with the upper surface of the read-only disc by detecting the disc drive and automatically moving the magnetic head upward when the disc is driven into the reproduction state. Is what you are trying to do.

[0017]

As shown in FIG. 1, the head driving device of the present invention is designed to perform reproduction or recording by using a read-only disc 4 and a write-once or rewritable disc 23. In the head drive device including the optical pickup 45 and the magnetic head 46, the read-only disc 4 and the write-once or rewritable disc 23 are rotatably housed in the cartridges 1 and 20, respectively. A discriminating means 38a capable of discriminating whether a read-only disc is accommodated or a write-once or rewritable disc is accommodated in either one of the 20 discs, and the read-only disc 4 is detected by detecting the discriminating means during recording and reproduction. When reproducing, the recording magnetic head 46 is automatically moved above the surface of the read-only disk to perform additional recording or Recording of recombinant disc 23 can, those made in the manner to automatically contact a magnetic head for recording on the write-once or rewritable disk surface at the time of erasing.

[0018]

According to the head drive device of the present invention, a read-only disc, for example, 8
When the cartridge storing the cmCD-ROM disc 4 is inserted, the disc type discriminating means provided on the surface of the cartridge body automatically discriminates that the disc is a reproducing-only disc accommodating cartridge and is provided on the head drive device. Of the optical pickup and the magnetic head, the magnetic head is automatically moved up to move from the upper surface of the read-only disc 4 to the non-contact state, so that the disc surface is not damaged and the discs of different types are reproduced. It is possible to provide a compatible disc player capable of recording.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the head drive device of the present invention will be described below with reference to the drawings. In this example, the read-only disc is a cartridge 1 containing an 8 cm CD-ROM, and the write-once and rewritable disc is a cartridge 20 containing a 3.5-inch MO 23, which can be recorded, reproduced, and erased in a single disc player. A different head drive device will be described.

FIG. 1 shows an overall schematic system diagram of a read-only disc equipped with the head drive device of this embodiment and a disc player for both write-once and rewritable discs.

In FIG. 1, reference numeral 35 denotes a holder into which the above-mentioned dual-purpose disk cartridge can be inserted. In the holder 35, the cartridge main body 1 or 20 in which the MO 23 or the CD-ROM 4 is rotatably accommodated is mounted, and the disk 4 or The disk 4 or 23 is rotatably fitted on a hub 37 fixed on the spindle shaft of a spindle motor 36 that drives 23.

To determine whether the lower surface of the cartridge body 1 or 20 is, for example, the cartridge body 1 containing a read-only disc or the cartridge body 20 containing a write-once or rewritable disc, FIG. As shown, for example, the disc type discrimination hole 38 is provided near the height positioning holes 33a and 33b of the cartridge body 20.
a or 38b is provided. In this case, 8c described in FIG.
It is not necessary to provide a disc type discrimination hole in the reproduction-only cartridge body 1 for the mCD-ROM. Of course, it may be reversed to determine that the hole is the disk cartridge body for the CD-ROM.

In addition, in order to determine such a disc type, in addition to the mechanical recesses and protrusions provided in the cartridge, the reflectance of the shutter may be changed, or a member having a high reflectance may be attached to a specific portion of the cartridge. A detector 39 is provided by mechanically or optically detecting these by sticking or applying a luminescent agent, or by magnetically detecting them by disposing a magnetic material or the like.
Can be configured. In FIG. 1, a mechanical detection pin 40 is inserted into the disc type discrimination hole 38 a, a mechanical displacement thereof is electrically detected by a discrimination circuit 41, and this is digitally converted to a microcomputer (hereinafter referred to as CPU) 42. It is configured to supply a detection signal to.

A spindle motor 36 for rotationally driving the disk 1 or 20 is controlled by a CPU 42, and driven and servoed by a spindle servo drive circuit 43. That is, if the disk cartridge inserted in the holder 35 of the disk player is the CD-ROM 4, the drive circuit 43 for spindle servo is CLV (Constant Linear).
Velocity), and if the disk cartridge is MO23, CAV (Constant Angular Velocity).

Reference numeral 44 denotes a substrate for moving the optical pickup device 45 in the radial direction of the disc 4 or 23, which is placed on the substrate 44 and irradiated with a laser beam from the lower surface of the disc 4 or 23 for recording or reproduction. The magnetic head support arm 47 for supporting the magnetic head 46 as well as the optical pickup device 45 for performing the spindle motor 3 is described later with reference to FIG.
6 is extended to the center position of 6 and is driven by the head drive device in the paper surface direction (shortened because it is difficult to understand in FIG. 1).

The optical pickup device 45 is controlled by a pickup servo circuit 48, and the pickup servo circuit 4 is controlled.
8 is controlled by the CPU 42. These servos include focus, tracking, head drive servo, and the like.

Further, the substrate 44 and the magnetic head supporting arm 47.
And are pivotally attached so that the
The sliding shaft of is pivotally attached. Plunger 49 is CPU
It is energized by a plunger drive circuit 50 controlled by 42. Reference numerals 51 and 52 are keyboards as input devices and output devices, and display devices such as LCDs.

FIG. 3 shows the head drive device portion described in FIG. 1 and the upward movement mechanism of the magnetic head 46. Board 4
The optical pickup device 45 attached to the No. 4 is MO2
3 or the longitudinal direction of the screw rod 53 and the guide rod 54 along the radial direction of the CD-ROM 4. Although not shown, the magnetic head 47 and the optical pickup device driving motor are rotated by a driving motor provided at the tip of the screw punch 53. This drive motor is controlled by the pickup servo circuit 48.

The plunger 49 is fixed on the substrate 44,
The tip of the sliding rod 55 of the plunger 49 is fixed to the tip of a vertical piece 56 that is bent in a substantially L shape. Further, the tip end of the vertical piece 56 is fixed to a support shaft 58 which is rotatably pivoted so as to bridge between the support pieces 44a and 44b which are erected at both ends of the substrate 44, and the support shaft 58 is centered. The magnetic head support arm 47 is constructed so as to be able to rotate in a clockwise or counterclockwise direction as shown by arrows A and B, and the magnetic head 46 is attached to the lower surface of the horizontal piece 57 of the magnetic head support arm 47. The magnetic head 46 is configured to face or contact the upper surface of 4 or 23.

The operation of this example in the disc player having the above-mentioned configuration will be described. When the cartridge body 1 containing the CD-ROM 4 is inserted, the cartridge body 1
Since the disc type discriminating hole 38a or 38b is not formed in the disc, the pin 40 of the detector 39 has the discriminating hole 38a or 38
Since it is not inserted in b, the determination circuit 41 determines that the cartridge contains the CD-ROM and supplies a detection signal to that effect to the CPU 42. The CPU 42 outputs a control signal for energizing the plunger drive circuit 50 based on the detection signal, and energizes the plunger 49.

Accordingly, the horizontal piece 57 of the magnetic head support arm 47 shown in FIG. 3 rotates clockwise about the support shaft 58, and the magnetic head 46 moves upward in the direction A from the upper surface of the disk 4 and holds it. To be done. At the same time, the CPU 42 controls the spindle motor by CLV.

On the other hand, when the cartridge body 20 containing the MO 23 is inserted, the pin 40 of the detector 39 is inserted into the disc type discrimination hole 38a or 38 of the cartridge body 20.
The pin 40 is inserted into b, and the detection signal indicating that the disk cartridge is the disk cartridge containing the MO 23 is output from the determination circuit 41 to the CPU 42.

When the CPU 42 turns off the plunger drive circuit 50, the plunger 49 is in a non-energized state, and the sliding rod 55 of the plunger projects from the inside of the plunger by the spring force so that the horizontal piece of the magnetic head support arm 47 is released. 5
7 is rotated counterclockwise about the support shaft 58 to move the magnetic head 46 to the upper surface of the MO 23 (a protective film is applied).
To increase the magnetic conversion efficiency and perform a recording or erasing operation.

At this time, of course, the CPU 42 CAV servos the spindle motor 36 and operates the optical pickup device.

In the above-mentioned embodiment, the upper operation of the magnetic head 46 is performed by the plunger. However, it is possible to mechanically or electrically move the magnetic head support arm 47 up or down by using a magnet or the like. it is obvious.

According to the head driving device of the present invention, the CD-R
A read-only disc cartridge such as an OM and a rewritable disc cartridge such as an MO that can be rewritten and recorded can be recorded and reproduced by one disc player, and which type is automatically selected when the cartridge is inserted into the device. Since the magnetic head is moved up or down depending on whether the disk cartridge is a disk cartridge, it is possible to obtain a head drive device that does not damage the disk when reproducing the read-only disk cartridge.

[0037]

According to the present invention, it is possible to provide a player having compatibility between a CD-ROM disc cartridge and an MO disc cartridge and to provide a head drive device which does not damage a read-only disc.

[Brief description of drawings]

FIG. 1 is an overall system diagram showing an embodiment of a head drive device of the present invention.

FIG. 2 is a bottom view of an MO cartridge used in the head drive device of the present invention.

FIG. 3 is a perspective view of essential parts showing an embodiment of the head drive device of the present invention.

FIG. 4 is a perspective view of a conventional CD-ROM cartridge.

FIG. 5 is a plan view of a conventional MO cartridge.

FIG. 6 is a bottom view of a conventional MO cartridge.

[Description of reference numerals] 1,20 Cartridge body 4 CD-ROM 23 MO 39 Detector 41 Discrimination circuit 46 Magnetic head 47 Magnetic head support arm 49 Plunger

Claims (1)

[Claims] 1. A head drive device comprising an optical pickup and a magnetic head adapted to perform reproduction or recording using a read-only disc and a write-once or rewritable disc, wherein the read-only disc and write-once or rewrite The type discs are rotatably housed in respective cartridges, and a discriminating means capable of discriminating whether a read-only disc or a write-once or rewritable disc is housed in either one of the cartridges is provided. By detecting the discriminating means at the time of recording and reproducing, the magnetic head for recording is automatically moved above the surface of the read-only disc at the time of reproducing the read-only disc, and at the time of recording / erasing the write-once or rewritable disc Magnetic head automatically contacts the surface of the write-once or rewritable disc. Head driving apparatus characterized by comprising the like.