JPH05325107A - External field generator - Google Patents

Abstract

PURPOSE:To suppress resonance of a leaf spring member by making multiple through holes through the leaf spring supporting a magnetic head. CONSTITUTION:A magnetic head 45 is supported at the leading end of a leaf spring member 180 having the base end part forming a free end. Since a plurality of through holes 187 are made through the member 180, resonance of the member 180 due to sliding of the head 45 on an optical disc can be suppressed as compared with a leaf spring member having no through hole without complificating the structure. Higher effect can be achieved through combination of a buffer member absorbing vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external magnetic field generator for applying an external magnetic field to a recording disk such as a magneto-optical disk when an information signal is recorded on the recording disk.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a recording / reproducing apparatus for recording / reproducing information signals by using a disc cartridge or the like which is constructed by accommodating a recording disc such as a so-called magneto-optical disc.

The above-mentioned magneto-optical disc has a disc substrate made of a transparent synthetic resin material and a signal recording layer made of a magnetic material adhered to one main surface of the disc substrate. There is. The writing of the information signal to the magneto-optical disk is performed by irradiating the predetermined portion of the signal recording layer with the focused light flux and applying an external magnetic field. The irradiation of the light flux is performed through the disc substrate from the other main surface side of the disc substrate. Then, the application of the external magnetic field is performed from the main surface portion on one side of the disk substrate. The portion of the signal recording layer irradiated with the light flux loses its coercive force by being heated to a temperature higher than the so-called Curie temperature.
Then, the heated signal recording layer is magnetized in the direction following the direction of the external magnetic field in the process of cooling.

That is, in the magneto-optical disk, while rotating the magneto-optical disk, the light intensity of the luminous flux or the magnetic field intensity of the external magnetic field is modulated in accordance with the information signal, whereby the signal recording layer The information signal can be recorded depending on the magnetization direction.

A disk device for recording an information signal using such a magneto-optical disk has a rotating operation mechanism for holding and rotating the magneto-optical disk and an external magnetic field for applying an external magnetic field to the magneto-optical disk. A magnetic head, which is a generator, and an optical pickup device that collects and irradiates a light flux on the magneto-optical disk are configured.
The magnetic head and the optical pickup device are arranged so as to face each other via the magneto-optical disk. That is, the magnetic head and the optical pickup device are connected to each other via the magnetic head support arm. Further, the magnetic head and the optical pickup device are arranged along with the magnetic head support arm so as to be movable in the radial direction of the magneto-optical disk over the inner and outer circumferences of the magneto-optical disk.

The magnetic head has a magnetic core and a magnetic field generating coil wound around the magnetic core. The magnetic head is substantially in sliding contact with the signal recording layer via a thin synthetic resin layer such as a so-called protective layer or a slipping layer formed on the signal recording layer, oil or fat, etc. Is disposed in close proximity to. That is, the magnetic head is supported by the magnetic head support arm in a state of being pressed against the magneto-optical disk by a slight pressing force.

The above optical pickup device is constituted by including a light source such as a laser diode and an optical device for guiding and condensing a light beam emitted from this light source. In this optical pickup device, the focal length of the objective lens that focuses the light flux on the signal recording layer is so positioned that the focus point of the light flux is located on the boundary surface between the signal recording layer and the disk substrate. And are arranged at a distance substantially equal to.

In reading the information signal recorded on the magneto-optical disk in the recording and reproducing apparatus, the signal recording layer is irradiated with a condensed light beam in a linearly polarized state, and the signal recording of the light beam is performed. This is performed by detecting the polarization direction of the light flux reflected by the layer. That is, when the light flux is reflected by the surface portion of the signal recording layer, the polarization direction is changed by the so-called Kerr effect according to the magnetization direction of the signal recording layer. Therefore, the change in the magnetization direction of the signal recording layer can be read by detecting the polarization direction of the reflected light flux.

The detection of the reflected light flux is performed by an analyzer and a photodetector provided in the optical pickup device. This analyzer is a so-called Wollaston prism, a half-wave plate, or the like, and converts a difference in polarization direction into a change in light intensity. The photodetector is a photodiode, a phototransistor, or the like, and converts the light intensity of the received light flux into an electric signal.

[0010]

As described above, the magnetic head used as the external magnetic field generator in the recording / reproducing apparatus is used in sliding contact with the magneto-optical disk. This is to maintain the magnetic head at a constant height position with respect to the magneto-optical disk without using a mechanism for controlling the drive of the magnetic head in the height direction.

However, when the magnetic head is in sliding contact with the magneto-optical disk, the sliding contact may cause vibration. Then, this vibration may excite resonance in the magnetic head support arm that supports the magnetic head.

When resonance occurs in the magnetic head supporting arm, the magnetic head is not slidably contacted with the magneto-optical disk in a certain state, and external self-harm cannot be properly applied to the magneto-optical disk. There is.

Therefore, the present invention is proposed in view of the above circumstances, and is an external magnetic field generator for applying an external magnetic field by slidingly contacting a magnetic head with a recording disk. It is an object of the present invention to provide an external magnetic field generation device that prevents occurrence of resonance of a magnetic head support arm that supports a magnetic head and that can favorably apply an external magnetic field.

[0014]

In order to solve the above problems and achieve the above objects, an external magnetic field generating apparatus according to the present invention has a magnetic head mounted on the front end side which is supported at the base end side and is a free end. The support has a substantially flat plate shape and has a plurality of through holes for preventing resonance.

Further, according to the present invention, in the above-mentioned external magnetic field generating device, a vibration absorbing cushioning member is attached to the support.

[0016]

In the external magnetic field generator according to the present invention, the substantially flat plate-shaped support body having the magnetic head attached to the tip end side which is supported at the base end side and serves as a free end is provided with a plurality of means for preventing resonance generation. Excitation of resonance is suppressed by having a through hole.

Further, in this external magnetic field generator, when a shock absorbing member for absorbing vibration is attached to the support, the shock absorbing member absorbs the vibration that causes the excitation of resonance, and therefore the support is used. Excitation of resonance at is suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. This example is an example in which the external magnetic field generating device according to the present invention is applied to a recording / reproducing device for recording / reproducing information signals on / from a magneto-optical disk. In this recording / reproducing apparatus, a recording medium shown in FIG.
And a recording / reproducing disk cartridge 2 shown in FIG.
01 or the reproduction-only disc cartridge 211 shown in FIGS. 21 and 22 is selectively used.

The recording / playback disc cartridge 2
Reference numeral 01 is configured by rotatably storing a recording / reproducing disk 205 in a recording / reproducing cartridge 202. The recording / reproducing disk 205 is a so-called magneto-optical disk, and is a disk-shaped disk substrate made of a transparent synthetic resin or the like, and a signal made of a magnetic material adhered to one main surface of the disk substrate. And a recording layer. The disk substrate is formed to have a diameter of about 64 mm, for example.

A chucked portion is provided at the center of the disk substrate. This chucked part is
The disk substrate is composed of a circular through hole 217 and a metal plate 216 that closes the through hole 217. The through hole 217 of the chucked portion has its center aligned with the center of curvature of a recording track formed in a spiral shape having a substantially concentric shape in the signal recording layer.

An annular portion around the through hole 217 on the other main surface portion of the disk substrate is formed so as to project and serves as a positioning reference portion 223. Further, the metal plate 216 is fitted and disposed in a recess 218 provided around the through hole 217 in the main surface portion on one side of the disc substrate, and is disposed on the main surface portion on one side of the disc substrate. It is designed not to project.

The recording / playback cartridge 202 is
It is formed in a thin housing having a size capable of accommodating the recording / reproducing disk 205. An opening 203 for a magnetic head is formed in the main surface portion of the upper surface of the recording / reproducing / reading cartridge 202 so that the main surface portion on one side of the recording / reproducing / reading disk 205 faces the outer side over the inner and outer circumferences. ing. The recording / playback cartridge 20 is also used.
In the main surface portion on the lower surface side of 2, the recording / playback disc 2
An opening 215 for an optical pickup device is formed so that the other main surface of 05 is exposed to the outside along the inner and outer circumferences. The openings 203 and 215 are formed at positions facing each other and have substantially the same size and shape. That is, the openings 203 and 215 are located on the lateral sides of the main surface of the recording / reproducing cartridge 202 from the substantially central position thereof with respect to the mounting direction of the recording / reproducing disc cartridge 201 in the recording / reproducing apparatus. Is formed in a substantially rectangular shape over the vicinity of the side portion. Further, a chucking opening 219 for exposing the chucked portion and the positioning reference portion 223 to the outside is provided in the central portion of the main surface portion on the lower surface side of the recording / playback cartridge 202. There is.

The recording / playback cartridge 2 is also used.
A shutter member 204 for opening and closing the openings 203 and 215 is slidably attached to 02. The shutter member 204 is formed by bending a rectangular thin plate member made of synthetic resin, metal, or the like into a U shape, and the opening portions 203, 2 are formed by the side portions.
The lid 15 can be closed. This shutter member 2
Reference numeral 04 designates the central portion of the recording / playback cartridge 20.
It is supported by one side edge portion 2 so as to be slidable in the front-rear direction along the one side edge portion. This shutter member 204
Slides with respect to the recording / reproducing cartridge 202 to open and close the openings 203 and 215.

A shutter lid operating hole 207 for closing the shutter member 204 is provided in a central portion of the shutter member 204 supported by one side edge of the recording / reproducing cartridge 202. ing.

The recording / playback cartridge 20 is also used.
2 has a pair of front and rear positioning holes 22 in the main surface portion on the lower surface side.
0,221 are drilled. These positioning holes 22
Nos. 0 and 221 are adapted to position the recording / reproducing cartridge 202 with respect to the recording / reproducing unit of the recording / reproducing apparatus by inserting a positioning pin in the recording / reproducing apparatus. Then, at the position on the front end side of the bottom surface of the recording / reproducing / combining cartridge 202, the recording / reproducing / combining marking portion 2 which is a disc type marking portion
09 are provided. This recording / playback dual-purpose marking unit 209
Is a recess formed on the bottom surface of the recording / playback cartridge 202 with a very shallow depth of about 0.7 mm, for example.

Further, the recording / playback cartridge 2 is also used.
The shutter member 20 is provided on one edge of the shutter member 20 from the front end side.
A shutter opening groove 206 is provided over the central portion of No. 4. In the recording / reproducing apparatus, by inserting the shutter opening piece into the shutter opening groove 206 from the front side, the shutter member 204 is slid to the rear side of the recording / reproducing cartridge 202 and the opening portions are opened. The lids 203 and 215 are opened. A shutter supporting projection 208 is provided at a central portion of the shutter member 204 supported by one side edge of the recording / reproducing cartridge 202 so as to project forward along the shutter release groove 206. Has been done.

The recording / playback cartridge 20 is also used.
An erroneous insertion prevention groove 224 is provided from the front end side at the side edge portion of the other side opposite to the above one side edge portion of 2. In the erroneous insertion prevention groove 224, in the recording and reproducing device,
The incorrect insertion prevention piece is inserted from the front side.

On the other hand, the read-only disc cartridge 211 is constructed by rotatably housing the read-only disc 214 in the read-only cartridge 212. The reproduction-only disc 214 has a disc-shaped disc substrate made of a transparent synthetic resin or the like, and a reflective layer made of a metal material adhered to one main surface portion of the disc substrate. There is. This read-only disc 214 is
It has the same size as the recording / playback disc 205. An information signal is recorded on the main surface portion of one side of the disc substrate of the reproduction-only disc 214 by forming fine irregularities by means such as injection molding. A chucked portion is provided at the center of the disc substrate. Like the chucked portion of the recording / playback disc 205, this chucked portion includes a circular through hole 217 formed in the disc substrate and a metal plate 216 that closes the through hole 217. It is configured.

The reproduction-only cartridge 212 is formed in a thin casing having a size capable of accommodating the reproduction-only disc 214. An opening 215 for an optical pickup device is formed in the lower main surface of the reproduction-only cartridge 212 so that the other main surface of the reproduction-only disc 214 faces the outer side over the inner and outer circumferences. There is. The opening 215 for the optical pickup device is located near the central portion of each main surface of the reproduction-only cartridge 212 and near the side of the reproduction-only disc cartridge 211 on the side with respect to the mounting direction in the recording and reproducing device. Is formed in a substantially rectangular shape. A chucking opening 219 for exposing the chucked portion and the positioning reference portion 223 to the outside is provided at the center of the lower main surface of the reproduction-only cartridge 212. ..

Then, the reproduction-only cartridge 212
A shutter member 213 for opening and closing the opening 215 for the optical pickup device is slidably attached to. The shutter member 213 is formed by bending one end side of a rectangular thin plate member made of synthetic resin, metal or the like, and has the opening 21 for the optical pickup device.
5 can be closed. This shutter member 21
The bent one end side portion is supported by one side edge portion of the reproduction-only cartridge 212 so as to be slidable in the front-back direction along the one side edge portion. The shutter member 213 slides with respect to the reproduction-only cartridge 212 to open and close the optical pickup device opening 215.

The shutter member 213 has a shutter member 20 of the recording / reproducing disk cartridge 201.
4, the shutter closing operation hole 207 and the shutter supporting projection 208 are provided.

The reproduction-only cartridge 212 has a pair of front and rear positioning holes 220 and 221 and a shutter opening groove 2 in the same manner as the recording / reproduction cartridge 202.
06 and erroneous insertion prevention groove 224 are provided.

Then, this reproduction-only cartridge 212
At the position on the front end side of the bottom surface of the disc, a reproduction-only indicator 210, which is a disc type indicator, is provided. The reproduction-only marking section 210 is a recess that is formed deeper than the recording / reproducing and marking section 209 and has a depth of, for example, about 2.5 mm and is formed on the bottom surface of the reproduction-only cartridge 212.

The recording / reproducing apparatus having the external magnetic field generating device according to the present invention has the chassis 1 as shown in FIG. This chassis 1 is made of a metal plate material or the like, and is made up of a chassis bottom plate portion 2 and left and right side plates 3 and 2 which are mounted on both sides of the chassis bottom plate portion 2 so as to be substantially perpendicular to the chassis bottom plate portion 2. And a part 4 are formed.

On the chassis bottom plate portion 2 of the chassis 1,
Writing and reading of information signals to / from the recording / playback disc 205, or the playback-only disc 214.
A recording / reproducing unit 41 for reading the information signal is fixedly attached. As shown in FIG. 2, the recording / reproducing unit 41 is configured to have a base unit 57 attached to the chassis bottom plate unit 2. The base portion 57 faces the upper surface of the chassis bottom plate portion 2 through the cutout portion 5 provided in the chassis bottom plate portion 2 so as to cover substantially the entire upper surface portion. A spindle motor for rotating the disks 205 and 214 is attached to the base 57 at approximately the center. In this spindle motor, the drive shaft 67 is projected to the upper surface side of the base 57. A disc table 43 on which the discs 205 and 214 are placed is attached to the tip end side of the drive shaft 67. The disc table 43 is formed in a substantially disc shape, and is supported by the drive shaft 67 by fitting the drive shaft 67 into a support hole provided in the central portion.
On the upper surface side of the disc table 43, a centering portion 66 formed in a substantially truncated cone shape is provided in the central portion, and the peripheral side portion of the centering portion 66 serves as a disc mounting portion 65. This centering portion 66
Is formed to have an outer diameter that can be fitted into the through hole 217 of the chucked portion of each of the disks 205 and 214. The centering portion 66 is provided for each of the disks 20.
When the positioning reference portions 223 of 5, 214 are placed on the disc placing portion 65, the outer peripheral surface portion is provided with the through hole 2
The discs 205, 21 are brought into contact with the inner edge of
4. Centering is performed.

On the disk table 43, the metal plate 21 of the chucked portion of each disk 205, 214 is attached.
A magnet for attracting 6 is attached. With this magnet, the disk table 43 positions and holds the disks 205 and 214.

A pair of front and rear positioning pins 59 and 60 are erected on the base 57. The positioning pins 59, 60 are formed in a substantially spindle shape with the diameter of the tip end reduced. These positioning pins 59, 60
Fits into the positioning holes 220, 221 of the disk cartridges 201, 211 mounted on the base 57, and positions the cartridges 202, 212 with respect to the base 57.

A pair of front and rear positioning projections 61, 62 are planted on the base 57. These positioning protrusions 61 and 62 abut on the bottom surfaces of the respective disk cartridges 201 and 211 mounted on the base part 57, and the respective cartridges 2 with respect to the base part 57.
The positioning of the height position of 02,212 is performed.

The optical pickup device 42 can be moved on the base 57 of the recording / reproducing unit 41 in the direction of contacting with or separating from the disc table 43, as shown by an arrow C in FIGS. 1 and 2. Installed on.

The optical pickup device 42 has an optical block section, and a light source such as a laser diode, a predetermined optical device for guiding a light beam emitted from the light source, and the disks 205 and 214 are reflected in the optical block section. In addition to having a built-in photodetector and the like for receiving the luminous flux, an objective lens driving device is attached to the optical block section. In this optical pickup device, the light flux emitted from the light source is emitted from the optical block portion and is incident on the objective lens 68 supported by the objective lens driving device. This objective lens 68
Collects the incident light flux. The objective lens driving device operates the objective lens 68 in two axial directions, that is, the optical axis direction of the objective lens and the direction orthogonal to the optical axis.

The optical pickup device 42 is supported by a pair of guide shafts 69 and 70 which are parallel to each other and mounted on the base 57, and can be moved in the axial direction of the guide shafts 69 and 70. Has been done. That is, the guide shafts 69 and 70 are inserted through the bearing holes formed in the optical block portion.

In the optical pickup device 42, the objective lens driving device faces the upper side of the base 57. In the optical pickup device 42, the optical axis of the objective lens 68 is perpendicular to the base 57, that is, perpendicular to the chassis bottom plate 2.

A magnetic head 45 is attached to the optical pickup device 42 via a connecting arm 73. As shown in FIG. 4, the connecting arm 73 is attached to the optical block portion of the optical pickup device 42 at the base end side and extends substantially parallel to the base portion 57, and has a magnetic end on the front end side. It has a rising bent piece portion 80 for supporting the head support block 44. The rising bent piece portion 80 is formed by bending the connecting arm 73 upward. The magnetic head support block 44
Is rotatably supported at its base end side by a support shaft 71 attached to the rising and bending piece portion 80, and extends from the rear side of the base 57 to the front side. By rotating the magnetic head support block 44 around the support shaft 71, the front end side, that is, the free end side, is moved to the base portion 5.
It is possible to make a displacement in a direction in which the movable body is brought into contact with and separated from 7.

On the front end side of the magnetic head support block 44, a magnetic head support arm 58 is attached so as to extend in the forward direction. A magnetic head 45 is attached to the tip of the magnetic head support arm 58 on the side facing the base 57. The magnetic head 45 is held at a position facing the objective lens 68. That is, the magnetic head 45 is located on the optical axis of the objective lens 68 and can move in the direction of coming into contact with and separating from the objective lens 68.

The magnetic head support arm 58 is, as shown in FIGS. 8 and 9, the magnetic head support block 44.
A frame body 179 supported at the base end side thereof, and a leaf spring 18 serving as a magnetic head support body supported at the base end side by the frame body 179.
It is configured with 0 and.

The frame 179 is formed of a material such as synthetic resin into a substantially elongated flat plate shape. This frame 179
Has a plurality of mounting holes 181 and 182 on the base end side, and is fixed to the magnetic head support block 44 through the mounting holes 181 and 182 by means such as screwing or fusion. Installed. And this frame 1
79 is an opening 188 extending from the middle part to the tip side part.
have.

The leaf spring 180 is made of a material such as a thin metal plate and is formed into a substantially rectangular shape. This leaf spring 1
80 has a plurality of mounting holes 183, 184 on the base end side, and a plurality of mounting bosses 1 projecting in the middle of the frame 179 through these mounting holes 183, 184.
85 and 186 are fixedly attached by means such as fusion bonding. The leaf spring 180 faces the inside of the opening 188 from the middle portion to the tip side portion.

A limiter member 189 is provided on the front end side of the frame body 179. The limiter member 189 is located below the tip side portion of the leaf spring 180 and is integrally formed with the frame body 179. The limiter member 189 is provided with an insertion hole having a size into which the magnetic head 45 can be inserted.

The magnetic head 45 is inserted into the insertion hole of the limiter member 189 and is attached to the lower surface of the tip side portion of the leaf spring 180. As shown in FIG. 9, the magnetic head 45 has a magnetic core portion around which a coil for generating a magnetic field is wound, and a core support member to which the magnetic core is attached. This magnetic core is
It is composed of a core portion around which the coil is wound, and a pair of yoke portions that are continuously provided from the base end portion of the core portion and extend to both sides of the coil. The core support member has a substantially cylindrical shaft portion 192 made of a material such as a synthetic resin, and a sliding portion 190 integrally formed in a substantially flange shape on the lower end side of the shaft portion 192. Are integrally formed. The magnetic core is placed inside the core support member at a position below the shaft 192 with the tip of the core member facing downward. This magnetic head 4
5, the upper end portion of the shaft portion 192 of the core support member is attached to the lower surface portion of the tip side portion of the leaf spring 180, and the sliding portion 190 is attached to the limiter member 189 via the suspension spring 191. Being supported, being supported.

The leaf spring 180 has a plurality of through holes 187 for preventing the occurrence of resonance. The through holes 187 are formed over substantially the entire surface of the portion of the leaf spring 180 that faces the opening 188.

A torsion coil spring 74 is externally wound and attached to one end of the support shaft 71 which supports the magnetic head support block 44. The torsion coil spring 74 is interposed between the connecting arm 73 and the magnetic head support block 44. The torsion coil spring 74 urges the magnetic head support block 44 to rotate in a direction in which the magnetic head 45 is separated from the objective lens 68. Therefore, the magnetic head support block 44 is attached to each of the disk cartridges 20.
In the initial state in which 1 and 211 are not mounted, as shown in FIGS. 4 and 5, the magnetic head 45 is in the initial position separated from the objective lens 68.

The magnetic head support block 44
A disc type detection arm 78 is attached to the disc. The disc type detection arm 78 is provided in the base 5
When the disc cartridges 201 and 211 are mounted on the disk 7, the front end side extending to the front side is provided with the recording / reproducing dual-purpose marking unit 209 or the reproduction-only marking unit 21
It is pressed by the bottom surface of No. 0 and is rotated around the support shaft 71 together with the magnetic head support block 44.

A stopper arm 75 is disposed on the base 57 as shown in FIGS. 2 and 3. The stopper arm 75 is rotatably supported in the middle of the rear portion of the base 57 via a support shaft 77. The stopper arm 75 has a cartridge contact pin 76 on the upper surface on one end side. As shown by an arrow S in FIG. 2, the stopper arm 75 is urged by an urging member such as a coil spring (not shown) in a direction to move the cartridge contact pin 76 to the front side, and is moved to the initial position. It is positioned. At this time, the other end side portion of the stopper arm 75 is located below the tip end side portion of the disc type detection arm 78, that is, between the tip end side portion and the base portion 57. In this state, the disc type detection arm 78 is brought into contact with the stopper arm 75, so that the base portion 5 is
It is prevented from turning to the 7 side. That is, at this time, the magnetic head support block 44 is prevented from rotating in the direction of bringing the magnetic head 44 closer to the base 57 than the initial position, via the disk type detection arm 78.

Then, the cartridge contact pin 76
As shown in FIG. 3, when the disc cartridges 201 and 211 are mounted on the base portion 57, the disc cartridges 201 and 211 come into contact with the front end portions of the disc cartridges 201 and 211 and are moved to the rear side. As shown by the middle arrow T, the stopper arm 75 is rotated. At this time, the other end side portion of the stopper arm 75 is moved forward from the lower side of the tip end side portion of the disc type detection arm 78,
The restriction on the rotation of the disc type detection arm 78 is released.

When the recording / reproducing disk cartridge 201 is mounted on the base 57, the magnetic head support block 44 is mounted on the disk type detecting arm 7.
8 is pressed by the bottom portion of the recording / reproducing / displaying portion 209 to rotate about the support shaft 71, and FIG.
As shown in, the magnetic head 45 is in the first position in which the magnetic head 45 is slidably contacted with the recording / reproducing disk 205. In addition, the magnetic head support block 44 is provided on the base 5
When the reproduction-only disc cartridge 211 is mounted on the disk 7, the contact protrusion 79 is attached to the reproduction-only marking portion 21.
6, the magnetic head 45 is moved toward the read-only disc 214 side relative to the initial position, as shown in FIG. The head 45 is located at a second position separated from the reproduction-only cartridge 212.

On the chassis bottom plate 2, as shown in FIG. 1, the disc cartridges 201,
A cartridge holder 26 for holding the disk cartridges 201 and 211 is provided by inserting 211 from the front side. The cartridge holder 26 is supported by the cartridge pressing plate 27. The cartridge pressing plate 27 is provided on the disk cartridge 20.
The main surface portions 1 and 211 have flat plate-shaped main surface portions having substantially the same size and shape, and side wall portions hanging from both sides of the main surface portion, and are formed of a metal plate or the like. The cartridge pressing plate 27 is arranged on the chassis bottom plate portion 2, and the rear side portions of the side wall portions are attached to the chassis bottom plate portion 2.
Is rotatably supported with respect to the chassis bottom plate portion 2
It is possible to approach and separate from. On the cartridge pressing plate 27, a plurality of leaf spring portions 27a for pressing and supporting the cartridges 202 and 212 downward are formed by cutting and raising.

The cartridge holder 26 has a housing-like shape having a size substantially corresponding to the cartridges 202 and 212 so that the cartridges 202 and 212 can be inserted from the front side. A part of the lower surface portion is formed to be open. The cartridge holder 26 is arranged on the lower surface side of the cartridge pressing plate 27 so as to extend substantially along the cartridge pressing plate 27, and both rear side portions can be pivoted to a middle portion of the cartridge pressing plate 27. Supported by. That is, the cartridge holder 26 can be brought into and out of contact with the cartridge pressing plate 27, and when the cartridge pressing plate 27 is rotated toward the chassis bottom plate portion 2 side, the cartridge pressing plate 2 is moved.
7 and the chassis bottom plate portion 2.

When the disc cartridges 201 and 211 are inserted into the cartridge holder 26 from the front side in a predetermined direction, the cartridge holder 26 is inserted.
The shutter opening piece provided inside is the shutter opening groove 2
Enter into 06. When the disk cartridges 201 and 211 are moved inward of the cartridge holder 26 and the shutter opening piece comes into contact with the front end portion of the shutter supporting projection 208, the cartridge holder 26 is provided. The shutter closing piece is fitted into the shutter closing operating hole 207. Then, when the disc cartridges 201 and 211 are further inserted into the cartridge holder 26, the shutter members 204 and 213 cause the front ends of the shutter supporting projections 208 to be the shutter opening pieces. Since it is stopped at the contacted position, the cartridge 20
2, 212 are slid with respect to each of the above-mentioned openings 20
Open the lids 3, 215.

A disc tray 30 is arranged on the chassis bottom plate 2. The disc tray 30 includes a receiving plate 39 on which the disc cartridges 201 and 211 are placed, and a frame portion that supports the receiving plate 39 so as to be vertically movable. The receiving plate 3
Reference numeral 9 has substantially the same shape and size as the main surface portions of the disk cartridges 201 and 211, and is formed of a thin metal plate or the like. The receiving plate 39 has a plurality of openings. These openings are formed on the receiving plate 3
When the disk cartridges 201 and 211 are placed on the disk 9,
No. 1 optical pickup device opening 215, chucking opening 219, positioning hole 220, each marking portion 20.
9, 210 and the like are made to face the lower side of the receiving plate 39.

The frame portion is made of a material such as a synthetic resin and has a linear portion located on the front end side of the receiving plate 39 and linear portions located on both sides of the receiving plate 39, and is substantially formed. It is formed to have a U-shape. That is, the frame portion is open on the rear side. The length of this frame portion in the front-rear direction is approximately twice the length of the main surface portion of the disk cartridges 201, 211 in the front-rear direction. The rear end side portions of both side portions of the frame portion are connected to each other via a connecting plate 31. The connecting plate 31 is made of a material such as a thin metal plate and is attached to the upper surface of the frame.

The frame portion supports the receiving plate 39 so as to be movable in the vertical direction. A pair of support pins 145, 146 are planted on both sides of the upper surface of the receiving plate 39. The support pins 145, 146 are fitted in a pair of support holes provided on both side portions of the frame portion from the lower side in a corresponding manner. The receiving plate 39 is movable in the up-down direction along the support holes 145, 146 along the support holes. This receiving plate 39 is
The front edge is near the front straight portion of the frame. The receiving plate 39 is elastically biased upward by a spring arranged in the frame portion.

The frame portion corresponds to both side portions of the disc cartridges 201 and 211 so that the disc cartridges 201 and 211 placed on the receiving plate 39 can be easily placed and taken out. At the position, a pair of cutouts 32 and 33 are provided to expose a part of both side portions of the disk cartridge 201 or 211 to the outside.

The disc tray 30 is arranged on the chassis bottom plate 2 and the disc cartridges 201 and 211 mounted on the receiving plate 39 are recorded and reproduced by the recording and reproducing unit 41.
Above the disk and the disk cartridge 20
It is movable between the attachment / detachment operation positions of 1 and 211. That is, the guide member 34 is attached to one side portion of the frame body 30. This guide member 34
Is formed of a material such as a synthetic resin having a shaft insertion hole 35, is attached to the frame portion, and is projected in one side direction from the frame portion. The guide shaft 29 attached to the left side plate portion 3 is inserted into the shaft insertion hole 35 of the guide member 34. The guide shaft 29 has a front end side supported by a shaft support portion formed by bending a front end side portion of the left side plate portion 3 outward, and is provided at a rear end side portion of the left side plate portion 3. The rear end side is supported by the shaft support portion, extends in the front-rear direction, and is attached to the left side plate portion 3. A guide protrusion 139 is provided in the front-rear direction on the other side portion of the frame portion. The guide protrusion 139 is slidably supported on the upper side portion of the right side plate portion 2. The disc tray 30 is slidable in the front-rear direction along the guide shaft 29 and the guide protrusion 139.

This disc tray 30 is indicated by an arrow B in FIG.
Direction, the receiving plate 39 is set to the loading position which is the upper position of the recording / reproducing section 41, and when the receiving plate 39 is moved to the front side in the direction of arrow A in FIG. 39 is a position projecting to the front side of the chassis 1 and is an unloading position that enables the operation of attaching and detaching the disc cartridges 201 and 211 on the receiving plate 39.

The disc tray 30 is moved by a cam gear 28 which is rotated by a loading motor attached to the left side plate portion 3. The cam gear 28 is a gear in which the outer peripheral gear portion is formed on the outer peripheral side and the first cam groove is formed on one main surface portion. In the outer peripheral gear portion, a toothless portion which is approximately half the entire width of the outer peripheral gear is formed over an angular range of approximately 90 °.

On the other hand, on the bottom surface of the frame portion, the outer peripheral gear portion of the cam gear 28 is substantially half the entire width of the outer peripheral gear portion, that is, the portion corresponding to the portion where the toothless portion is formed. A rack gear that meshes with is formed. That is, when the cam gear 28 rotates, the frame portion is moved and operated within a rotation range of approximately 270 ° of the cam gear 28, that is, within a range in which the outer peripheral gear portion meshes with the rack gear. And this frame part
Within the rotation range of the cam gear 28 of about 90 °, that is, within the range where the toothless portion faces the rack gear, the movement operation is not performed.

The cam gear 28 is used not only for the disc tray 30 but also for the cartridge pressing plate 2.
Move 7 as well. The operation of moving the cartridge pressing plate 27 by the cam gear 28 is performed by rotating the toothless portion within an angle range of about 90 ° where the toothless portion faces the rack gear of the frame portion.

That is, the cartridge pressing plate 27
Is engaged with the first cam groove via a driven arm (not shown). That is, the cartridge pressing plate 27 is rotated with respect to the chassis bottom plate portion 2 when the cam gear 28 is rotated.

The chassis 1 is so-called floating-supported and attached to the support substrate 18 fixedly arranged in the outer casing of the recording and reproducing apparatus. That is, the chassis 1 corresponds to the support substrate 1
8 tension coil springs 6, 7, 8, 9
And four dampers 22, 23, 24, 25 are supported. These dampers 22, 23, 24, 25 are
A liquid material having a high viscosity is enclosed in a bag-shaped member made of a flexible material such as rubber.

In the recording / reproducing apparatus having the external magnetic field generating device according to the present invention as described above, first, the recording / reproducing disc cartridge 201 or the reproduction-only disc cartridge 211 is mounted. The disc tray 30 is set to the unloading position. At this time, the cartridge pressing plate 27 is held at a position separated from the chassis bottom plate portion 2, and the cartridge holder 26 is separated from the chassis bottom plate portion 2. In this state, the disc cartridges 201 and 211 are placed on the receiving plate 39.

When the cam gear 28 starts to rotate by the loading motor, the disc tray 30 is moved to the rear side as shown by an arrow B in FIG. When the disc tray is moved further rearward, the disc cartridges 201, 21
1 is inserted into the cartridge holder 26 from the front side. Then, the disk cartridges 201, 2
11, the shutter members 204 and 213 are
The shutter opening piece allows the cartridge 202,
The optical pickup device opening 215 or the magnetic head opening 203 is moved with respect to 212.
Then, the opening 215 for the optical pickup device is opened. At this time, the shutter closing piece is fitted into the shutter closing operating hole 207. Until this time,
As shown in FIGS. 4 and 5, the magnetic head support block 44 is at an initial position for holding the magnetic head device 45 in the raised position.

When the disc tray 30 reaches the loading position, the toothless portion faces the rack gear of the disc tray, and even if the cam gear 28 further rotates, the disc tray 30 remains stopped. Maintained. At this time, the disc cartridge 201,
As shown in FIG. 5, 211 is conveyed to a position above the recording / reproducing unit 41. At this time, the arrow U in FIG.
The space between the bottom surfaces of the disk cartridges 201 and 211 and the disk table 43 shown by is a sufficient distance of, for example, about 4 mm.

When the cam gear 28 further rotates, the cartridge pressing plate 27 is rotated by the first cam groove to the side closer to the chassis bottom plate portion 2. Then, the disk cartridges 201, 21
As shown in FIG. 6 and FIG.
It is mounted and mounted on the base part 57, and the loading operation is completed. These disk cartridges 201,
211 is elastically pressed and supported by the leaf spring portions 27a of the cartridge pressing plate 27 on the side of the base portion 57. The receiving plate 39 is pressed by the disc cartridges 201 and 211 and moved downward with respect to the frame portion. The cartridges 202 and 21
2 is positioned at a predetermined position on the base 57 by the positioning pins 59, 60 and the positioning protrusions 61, 62.

Then, the magnetic head support block 44
When the recording / playback disc cartridge 201 is mounted, as shown in FIG.
Playback-only disc cartridge 2
When 11 is attached, as shown in FIG.
The first position is set. In addition, each of the above disks 20
5, 214 are positioned and mounted on the disc table 43. At this time, the spindle motor can rotate the disks 205 and 214 together with the disk table 43.

In the case where the recording / reproducing disk cartridge 201 is mounted on the base 57,
As shown in FIG. 9, the magnetic head 45 places the lower surface of the sliding portion 190 on one main surface of the recording / reproducing disk 205. Then, when the recording / reproducing disk 205 is rotated by the spindle motor and the recording / reproducing disk 205 moves with respect to the magnetic head 45 as shown by an arrow β in FIG. 9,
The magnetic head 45 makes the sliding portion 190 slidably contact one main surface portion of the recording / reproducing disk 205. At this time, the leaf spring 180 causes the magnetic head 4 to move.
5 is pressed against the recording / reproducing disk 205 with an appropriate pressing force. Further, the suspension spring 191 absorbs vibrations of the magnetic head 45 due to fine unevenness caused by dust or damage on the main surface of the recording / reproducing disk 205. In addition, the leaf spring 1
Reference numeral 80 denotes a plurality of through holes 18 for preventing resonance as described above.
Since 7 is provided, the excitation of resonance due to the vibration of the magnetic head 45 is suppressed. That is, the leaf spring 180 does not cause so-called "squeal".

In this state, in the optical pickup device 42, the objective lens 68 is opposed to the main surface portion on the other side of the recording / reproducing disk 205 or the reproduction-only disk 214. In addition, the optical pickup device 42 includes the disks 205,
The objective lens 68 can be moved over the inner and outer circumferences of the disks 205 and 214 while the objective lens 68 is opposed to the disk 214. The optical pickup device 42 is capable of irradiating each of the disks 205 and 214 with a light beam from the other main surface side. The optical pickup device 42 includes the disks 205, 21.
When the disc type detection arm 78 is moved in the radial direction over the inner and outer peripheries of 4, the movement of the support shaft 71 in the axial direction is blocked by the base portion 57, and remains at a fixed position. At this time, the support shaft 71 and the rotation restricting shaft 72 are moved together with the magnetic head support block 44 and slide in the axial direction with respect to the disc type detection arm 78.

By operating the spindle motor, the optical pickup device 42, and the magnetic head device 45, the recording / playback disk 205 is also used.
It is possible to write an information signal to. That is, the recording / playback disc 205 is rotated, and the signal recording layer of the recording / playback disc 205 is focused by the optical pickup device 42 to irradiate the luminous flux to heat the illuminated area, which is then heated. The magnetic head device 45 applies an external magnetic field to the portion to write the information signal. In this state, the information signal can be read from the reproduction-only disc 214. That is, the reproduction-only disc 214 is rotated, and the optical pickup device 42 collects and irradiates the luminous flux on the reflective layer.
The information signal is read by detecting the reflected light flux of the light flux.

Then, in order to take out the respective disk cartridges 201 and 211 mounted in the recording / reproducing section as described above from the recording / reproducing apparatus, the cam gear 28 is used.
Is rotated in the reverse direction of the loading operation described above, and is rotated in the direction in which the disc tray is transferred to the front side. Then, the cartridge pressing plate 27 is rotated in a direction away from the chassis bottom plate portion 2, and the cartridge holder 26 is moved to the upper side of the chassis bottom plate portion 2. At this time, the disc cartridge 20
The reference numerals 1 and 211 are separated from the base 57 of the recording / reproducing unit 41 and placed on the receiving plate 39. Further, the magnetic head support block 44 returns to the initial position by the biasing force of the torsion coil spring 74, as shown in FIG. At this time, the magnetic head 45 moves downward with respect to the frame body 179 together with the tip side portion of the leaf spring 180, but the limiter member 189 contacts the tip side portion of the leaf spring 180. , This leaf spring 18
Prevent excessive deviation of zero.

When the cam gear 28 is further rotated, the disc tray 30 is moved forward. At this time, the disc cartridges 201 and 211 are conveyed forward while being placed on the receiving plate 39. At this time, in the disc cartridges 201 and 211, the shutter closing pieces are used to close the shutter members 204 and 213. Further, the cam gear 28 is rotated,
When the disc tray 30 reaches the unloading position, the disc cartridges 201 and 211 are
It can be removed from the disc tray 30.

The external magnetic field generator according to the present invention is
As shown in the above-described embodiment, the leaf spring 180 is not limited to the configuration in which the plurality of through holes 187 are formed, and as shown in FIGS. 10 to 12, 17 and 18, the leaf spring 18 is formed.
0 may be provided with the resonance preventing opening 187 having a larger opening area than the through hole 187 in the above-described example. Also in this case, the leaf spring 180 is provided with the resonance preventing opening 187, so that the occurrence of resonance is suppressed. 11 and 12, the magnetic core 193 and the core material portion 193 of this magnetic core are shown.
The structure of a and the coil 194 is shown.

Further, as shown in FIGS. 13 and 14, the external magnetic field generator according to the present invention has the leaf spring 180.
Alternatively, a cushioning member 195 for absorbing vibration or shock may be attached. The cushioning member 195 is formed of a material such as synthetic resin into a substantially plate shape along the leaf spring 180. The cushioning member 195 is attached in close contact with the leaf spring 180 by inserting a plurality of boss portions 197 into the through holes provided in the leaf spring 180. The buffer member 195 may be attached to the leaf spring 180 by melting after the boss portion 197 is inserted into the through hole, and may be attached to the leaf spring 180 by so-called outsert molding. It may be formed. Even in this case, the leaf spring 180 is provided with the cushioning member 1.
By attaching 95, the occurrence of resonance is suppressed.

In this example, the magnetic head 45 has the leaf spring 18 on the tip side of the leaf spring 180.
0 and the magnetic head mounting hole 196 penetrating the buffer member 195, the shaft portion 192 is fitted and supported. Further, in this case, the magnetic head 45 may be supported on the tip end side of the leaf spring 180 by heat-sealing the core support member to the buffer member 195.

In the external magnetic field generator according to the present invention, when the cushioning member 195 is attached to the leaf spring 180, as shown in FIGS. The spring 180 may be continuously provided on both sides. That is, the cushioning member 195 is composed of a portion attached to one surface side of the leaf spring 180 and a portion attached to the other surface side of the leaf spring 180. The respective portions forming the cushioning member 195 are continuously provided in the intermediately provided continuous portion 198. The continuous portion 198 is inserted through the through hole provided in the leaf spring 180. The cushioning member 195 is attached in close contact with the leaf spring 180 by inserting the plurality of boss portions 197 into the through holes provided in the leaf spring 180 at the respective portions forming the cushioning member 195. ing.

In this case, even if the leaf spring 180 and the cushioning member 195 have different thermal expansion rates or contractions due to the different coefficients of thermal expansion, the leaf spring 180 has the cushioning effect on both sides. By providing the member 195, the curving deviation in one direction is prevented. The cushioning member 195 is also melted by inserting the boss portion 197 into the through hole and then melting the boss portion 197.
It may be attached to the plate spring 180, or may be attached to the leaf spring 180 by so-called outsert molding. In this case as well, the leaf spring 180 has the cushioning member 195 attached thereto, so that the occurrence of resonance is suppressed.

Also in this example, the magnetic head 45 is used.
Is supported by inserting the shaft portion 192 into a magnetic head mounting hole 196 provided at the tip end side of the leaf spring 180 and penetrating the leaf spring 180 and the buffer member 195. At this time, the core supporting member may be heat-sealed to the buffer member 195.

[0086]

As described above, in the external magnetic field generator according to the present invention, the substantially flat plate-shaped support body having the magnetic head attached to the distal end side which is supported at the base end side and is a free end, Excitation of resonance is suppressed by having a plurality of through holes for preventing resonance generation.

Further, in this external magnetic field generator, if a cushioning member for absorbing vibration is attached to the support, the cushioning member absorbs the vibration that causes excitation of resonance. Excitation can be suppressed.

That is, the present invention is an external magnetic field generator for applying an external magnetic field by sliding the magnetic head against the recording disk, and the resonance of the magnetic head support arm for supporting the magnetic head is generated. It is possible to provide an external magnetic field generation device that is prevented and can favorably apply an external magnetic field.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a recording and reproducing apparatus configured using an external magnetic field generating apparatus according to the present invention.

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

FIG. 3 is a plan view showing a state in which a disc cartridge is mounted on the recording / reproducing unit.

FIG. 4 is a side view showing a configuration of the recording / reproducing unit and a disc cartridge mounted in the recording / reproducing unit.

FIG. 5 is a side view showing a state in which the disc cartridge is being mounted in the recording / reproducing unit.

FIG. 6 is a side view showing a state in which a read-only disc cartridge is mounted in the recording / playback unit.

FIG. 7 is a side view showing a state in which a recording / reproducing disk cartridge is mounted in the recording / reproducing unit.

FIG. 8 is an enlarged plan view showing a configuration of a main part of the external magnetic field generator according to the present invention.

FIG. 9 is an enlarged side view showing a configuration of a main part of the external magnetic field generator.

FIG. 10 is an enlarged plan view showing another example of the configuration of the main part of the external magnetic field generator.

11 is an enlarged side view showing a configuration of a main part of the external magnetic field generation device shown in FIG.

12 is an enlarged bottom view showing a configuration of a main part of the external magnetic field generation device shown in FIG.

FIG. 13 is an enlarged plan view showing a case where the external magnetic field generator is provided with a buffer member.

14 is an enlarged side view showing a configuration of a main part of the external magnetic field generating device shown in FIG.

FIG. 15 is an enlarged plan view showing another example of the case where the external magnetic field generator is provided with a buffer member.

16 is an enlarged side view showing a configuration of a main part of the external magnetic field generation device shown in FIG.

FIG. 17 is an enlarged plan view showing the external magnetic field generator having a magnetic head configuration different from that of the above example.

FIG. 18 is an enlarged side view showing a configuration of a main part of the external magnetic field generation device shown in FIG.

FIG. 19 is a perspective view showing the structure of a disk cartridge for both reproduction and reproduction.

FIG. 20 is a perspective view of the recording / reproducing disk cartridge as viewed from the bottom side.

FIG. 21 is a perspective view showing the structure of a reproduction-only disc cartridge.

FIG. 22 is a perspective view of the reproduction-only disc cartridge as seen from the bottom side.

[Explanation of symbols]

 45 ... Magnetic head 58 ... ..Magnetic head supporting arm 179 ... Frame body 180 ... ..... leaf spring

Claims (2)

[Claims] 1. A substantially flat plate-shaped support body having a base end side supported and a magnetic head attached to a free end side, the support body having a plurality of through holes for preventing resonance generation. An external magnetic field generator comprising: 2. The external magnetic field generator according to claim 1, wherein a shock absorbing member for absorbing vibration is attached to the support.