JPS6320750A - Magneto-optical information recording device - Google Patents

Abstract

PURPOSE:To prevent two magnetic field giving means from exerting adverse effect to each other by providing one magnetic field giving means giving a magnetic field in the reverse direction to the magnetizing direction at the recording time and the other magnetic field giving means for an objective lens servo- driving on the perpendicularly magnetized film of a disk and disposing a magnetism shielding member between both the magnetic field giving means. CONSTITUTION:The magnetism shielding member 199 consisting of the blank having a high permeability is provided so as to cover the magnet 62 and yoke 63 which are as the magnetic field giving means for servo driving an objective lens 58. This member 199 is provided by being located in the space with the plate-shaped magnets 181, 182 of the magnetic field giving means to give the magnetic field in the reverse direction to the magnetizing direction of this magnet 62 and a disk 15, and the leaked magnetic flux from the magnets 181, 182 and magnet 62 is absorbed by this member 199 and these both magnetic field giving means are made to have no adverse effect each other.

Description

[Detailed description of the invention] Technical field The present invention relates to a magneto-optical information recording device.

BACKGROUND ART For example, a magneto-optical information recording device is known that records information using a disk having a recording surface made of an amorphous alloy thin film. This is because the thin film is a so-called perpendicular magnetization film with a magnetization direction perpendicular to its film surface, and when the thin film is heated above the Curie temperature or compensation temperature, the perpendicular magnetization direction is changed by a weak external magnetic field. It records information by taking advantage of its changeable nature. In other words, in a predetermined direction (corresponding to "0" of a binary signal)
A bias magnetic field in the opposite direction is applied by a magnetic field applying means to a thin film that is magnetized to The words are recorded by controlling the magnetization direction of the parts in the opposite direction.

Note that the reproduction of recorded information utilizes the Kerr effect, which is an interaction between magnetism and light, and while the linearly polarized irradiation light is incident on the perpendicularly magnetized film and reflected, the polarization plane becomes vertical. Since it rotates depending on the direction of magnetization, reproduction is possible by measuring the rotation angle using an analyzer.

When recording or reproducing as described above, it is necessary to accurately focus the irradiation light onto a predetermined position on the perpendicularly magnetized film as a fine spot. For this purpose, it is necessary to servo drive the objective lens for focusing the irradiation light emitted from the light emitting element onto the perpendicularly magnetized film in the direction of the optical axis of the objective lens and in the direction perpendicular thereto. Therefore, a servo drive mechanism is provided that includes a coil and a magnetic field applying means for applying a magnetic field to the coil, and performs the servo drive using electromagnetic force.

In a magneto-optical information recording device having such a configuration, there is an inconvenience that the magnetic field applying means for applying a bias magnetic field to the perpendicularly magnetized film and the above-mentioned magnetic field applying means for servo driving adversely affect each other due to leakage magnetic flux. Ta.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its purpose is to provide perpendicular magnetization, a magnetic field applying means for applying a bias magnetic field to a film, a magnetic field applying means for servo driving, etc. It is an object of the present invention to provide a magneto-optical information recording device that does not cause any adverse effects.

The magneto-optical information recording device according to the present invention includes a magnetic field applying means for applying a magnetic field in a direction opposite to the magnetization direction of the perpendicularly magnetized film of the recording medium, and another magnetic field applying means for driving the objective lens servo, It is characterized in that a magnetic shielding member is interposed between the two magnetic field applying means.

Embodiments Hereinafter, a magneto-optical information recording and reproducing apparatus including a magneto-optical information recording apparatus as an embodiment of the present invention will be described with reference to the accompanying drawings.

Note that the magneto-optical information recording/reproducing apparatus applies a bias magnetic field in a direction opposite to the predetermined direction to a disk including a perpendicular magnetization film magnetized in a predetermined direction by means of a magnetic field applying means, and records information. Information is recorded by emitting a light beam modulated by the light emitting means. In addition, when reproducing recorded information, due to the Kerr effect, which is an interaction between magnetism and light, while the linearly polarized irradiation light is incident on the perpendicularly magnetized film and reflected, the polarization plane is Reproduction is performed by utilizing the fact that the magnet rotates depending on the direction of magnetization, and measuring the rotation angle using a predetermined analyzer. In addition, in the magneto-optical information recording/reproducing apparatus, a disk to be recorded or reproduced is housed in a flat cartridge, and recording/reproduction is performed in this housed state.

Among the various mechanisms included in the magneto-optical information recording and reproducing apparatus, first, the recording ij generating means that performs the above-mentioned recording and reproduction will be explained.

A frame 1 shown in FIGS. 1 to 4 is provided within a housing (described later) of the magneto-optical information recording and reproducing apparatus, and is attached to the housing via four leg members 2.3. ing. Note that the frame 1 is made of aluminum or an alloy thereof.

A pair of cylindrical steel support rails 5 and 6 extending in the direction of arrow Y and the opposite direction and spaced apart in the direction of arrow Z and the opposite direction are fixed to this frame 1 at both ends thereof. .

A longitudinal pickup body 7 as a holding member extending in the arrow Z direction and the opposite direction is attached to both support rails 5.
, 6, and is movably supported by both support rails. This pickup body 7 is also made of aluminum or its alloy. Two M520-RAs 8 are attached to one side of the pickup body 7 so as to roll on the support rails 5.

There are also two on the other side of the pickup body 7, a total of 4
Two other steel rollers 9 are mounted at two intervals apart in the direction of movement of the pickup body, and are in contact with the other support 13 rail 6. As is particularly clear from FIG.
Point supported.

As shown in FIG. 4, a roller 8 provided on one side of the pickup body 7 is attached to a pin 1
1 to the free end of a swing lever 12 which is swingably mounted in the direction of arrow R. Note that the direction of arrow R is perpendicular to the direction of movement of the pickup body (direction of arrow Y and its opposite direction). Further, a spring member 13 is provided as a suppressing means for pressing the roller 8 against the support rail 5. 3 mentioned above
By pressing the roller 8 on the one point side of the point support against the support rail 5 in this way, the rollers 9 on the other two point sides are also pressed against the other support rail 6 by the reaction force.

Note that the magneto-optical information recording/reproducing device is installed so that the direction of arrow Z is the anti-gravitational direction. In other words, 1 above
The roller 8 on the point side is always positioned in the anti-gravity direction with respect to the roller 9 on the two point side. 2. Due to this, there is a large weight such as the spring member 13 or the pickup body for pressing the roller 8 against the support rail 5]
I no longer receive it.

In addition, both the above-mentioned support rails 5 and 6 and the steel roller 8,
9, the spring member 13, and peripheral small members related thereto constitute a support means that supports the pickup body 7 so as to be movable along the recording surface of the disk 15, which is a recording medium.

As shown in FIGS. 2 and 4, in frame 1,
A pair of longitudinal magnetic circuits 20 are fixed, each extending along the direction of movement of the pickup body 7 (the direction of arrow Y and the opposite direction thereof) and consisting of a longitudinal magnet 16 and a longitudinal yoke 17, 18 which are engaged with each other. Further, as shown in FIG. 2, a pair of drive coils 21 are attached to the pickup body 7 so that the center axis of the coils is parallel to the direction of movement of the pickup body. The magnetic circuit 20 described above generates a magnetic flux that interlinks with the drive coil, and together with the drive coil constitutes a linear motor as a moving force applying means for applying a moving force to the moving optical system including the pickup body 7.

Note that the linear motor applies a moving force to a portion of the moving optical system including the pickup body 7 that corresponds to a node of primary transverse vibration.

As shown in FIG. 2, a detection coil 22 is wound around the outer periphery of each drive coil 21 described above so that the center axis of the coil is concentric with the center axis of the drive coil. The magnetic flux described above and emitted from the magnetic circuit 20 of the near motor also interlinks with this detection coil 22. These magnetic circuit 20 and detection coil 22 constitute a speed detecting means for detecting the moving speed of the pickup body 7 and controlling the moving speed. That is, the magnetic circuit 20 constituting the linear motor is also used as the magnetic circuit of the speed detecting means.

As is clear from FIG. 2, the aforementioned steel rollers 8 and 9 are arranged on the yoke 17 side of the magnetic circuit 20.

As shown in FIGS. 1, 3, and 4, a flat rectangular parallelepiped-shaped holding member 25 is attached to the rear end of the frame 1. As shown in FIGS. As shown in FIG. 5, this holding member 25 includes a laser diode 27 as a light emitting element,
A collimator lens 28 that converts the irradiation light emitted from the laser diode into parallel light, two condensing lenses, and a disk 1.
A light receiving element 30 for finally receiving the reflected light from the recording surface of No. 5 to obtain an information signal, shapes the irradiation pattern of the parallel light emitted through the collimator lens 28, guides it to an objective lens to be described later, and performs disk recording. The composite prism 31 guides the reflected light from the surface to the light receiving element 30, and detects the focal error of the light beam emitted toward the disk recording surface.
For the purpose of this, an astigmatism element 32 is attached to give astigmatism to the reflected light. Further, as shown in FIG. 5, the above-mentioned -.
A part of the β destination is reflected within the compound prism and sent to the outside by 7
A monitor light-receiving element 34 is arranged for detecting the 171 radiation.

FIG. 6 shows the ■-Vl arrow view in FIG. 5, and as is clear from both figures, the laser diode 27
is fitted into a counterbore formed in a rectangular plate-shaped holder 35, and is attached to the holding member 25 via the holder. As shown in FIG. 6, a substantially triangular holding plate 36 is provided to prevent the laser diode 27 from being removed from the holder 35, and is fixed to the holder 35 with screws 37.

The rectangular plate-shaped holder 35 described above is movable with respect to the holding member 25 together with the supported laser diode 27 in a plane perpendicular to the optical axis of the laser diode, in this case, in the direction of arrow Y and in the opposite direction. It has become. As a result, the relative positions of the laser diode 27 and the collimator lens 28 in the plane are adjusted,
The parallel light emitted toward the pickup body 7 through the collimator lens 28 is matched with the moving direction of the pickup body.

Note that the laser diode 27 and the frimeter lens 28
, a composite prism 31, and a holding member 2 that holds these.
5 are collectively referred to as a light source mount.

Furthermore, the light source mount is movable in parallel in the direction of arrow Z perpendicular to the optical axis of the parallel light emitted toward the pickup body 7 through the collimator lens 28 and the compound prism 31, and in the opposite direction. Further, the objective lens and its servo drive mechanism, which will be described later, are movable in parallel on the pickup body 7 in the direction of arrow Y and in the opposite direction. As a result, the relative position of the light source mount and the objective lens (described later) in the Y-2 plane is adjusted, and the center axis of the intensity distribution of the parallel light emitted toward the pink-up body 7 is adjusted to the position of the objective lens (described later). It is possible to align it with the optical axis.

FIG. 7 shows a view taken along arrows 1--2 in FIG. 5, and as is clear from both figures, the light-receiving element 30 is also attached to the holding member 25 via a rectangular plate-shaped holder 39. This holder 39 has a clearance in the X direction, the Y direction, and the opposite directions thereof, and has a notch 40 in which a screw 41 is engaged, and is fixed to the holding member 25 by the screw 41. Position adjustment is possible within the clearance range.

FIGS. 8 and 9 show a cross section along ■--■ and a cross-section along IX-IX in FIG. 5, respectively.
8. The part that holds the condensing lens 29 and the astigmatism element T-32 is a groove 43.4 whose cross section perpendicular to the optical path is V-shaped.
4 and 45.

As shown in FIG.
a circular correction surface 50 that is inclined at a predetermined angle with respect to the parallel light obtained through 8 and performs circular correction of the parallel light (makes the elliptical irradiation pattern of the parallel light circular); a total reflection surface 51 that totally reflects the parallel light transmitted through the
It has a polarized light reflecting surface 52 for transmitting the parallel light reflected by the total reflection surface and guiding the reflected light from the disk recording surface to the light receiving element 30. Further, the second prism 49 is attached to this polarized light reflecting surface 52, and cooperates with the polarized light reflecting surface to direct the reflected light from the disk recording surface to the light receiving element 30.
It has the effect of leading to The polarization reflecting surface 52 extends widely to serve as a reference surface, and by using the reference surface as a reference, the second prism 49 and the like can be easily positioned.

In addition, as shown in FIG. 5, the collimator lens 28
The angle between the parallel light emitted through and this reference plane is 4
It is 5°. This makes the incident optical axis 54 and the outgoing optical axis 55 parallel to the composite prism 31, making it easy to arrange the laser diode 27 and the light receiving element 30.

As shown in FIG. 3, the pickup body 7 includes:
The collimator lens 28 and the first summer prism 31 mentioned above
A total reflection prism 57 is also provided as a guide means for bending the optical path of parallel light emitted through it at right angles. Further, as shown in FIGS. 1 and 2, the pickup body 7 includes an objective lens 58 for focusing the parallel light that has passed through the total reflection prism 57 onto the recording surface of the disk 15 as a fine spot light. and an objective lens that includes a holder 59 and a support member 60 (shown in the first diagram) and supports the objective lens movably in two directions: the forward axis direction (direction of arrow F) and the direction perpendicular thereto (direction of arrow T). It consists of a support mechanism, a magnetic circuit consisting of a magnet 62 and a yoke 63, and a coil (not shown) wound around five holders so that the magnetic flux from the magnetic circuit interlinks with the objective lens 58 in the above two directions. A driving source is provided to provide a moving force to the. Note that this drive source and the objective lens support mechanism described above are collectively referred to as a servo drive mechanism. That is, the servo drive mechanism drives the objective lens 58 using electromagnetic force.

As shown in FIG. 4, a flexible printed circuit board 65 is provided for supplying drive current to the servo drive mechanism mounted on the pickup body 7. The printed circuit board is bent into a U-shape in its thickness direction, and is disposed within the movement locus of the pickup body 7 so that its thickness direction is parallel to the recording surface of the disk 15. As shown in FIGS. 1 and 3, a turntable 66 is provided in front of the pickup body 7 and rotates while supporting the disk 15. As shown in FIGS.

As shown in FIG. 4, a rack portion 71 is provided at one end of the pickup body 7 along the direction of movement of the pickup body (the direction of arrow Y and the opposite direction thereof). Further, a rack member 72 is arranged near the rack portion along the moving direction of the pickup body 7 and corresponding to the entire length of the movement stroke, and can be freely engaged with and disengaged from the rack portion 71. so frame 1
movably attached to. Further, although not shown, a spring member is provided as a suppressing means for pressing the rack member 72 toward the rack portion 71 so as to mesh with the rack portion 71 .

These spring members 71 and rack members 72 constitute fixing means for fixing the pickup body 7 to the frame 1, that is, to the housing (described later). The rack member 72 is configured to be detached from the rack portion 71 by a cartridge holder, which will be described later.

It should be noted that all the materials described so far constitute most of the recording/reproducing means for recording information on the disk 15 and reproducing the same.

In FIG. 10, reference numeral 75 indicates the entire magneto-optical information recording and reproducing apparatus. As shown in FIGS. 1 to 3, the disk 15 is rotatably housed in a cartridge 77, and information can be recorded on and reproduced from the disk while in this housed state. 1st
As shown in FIG. 0, the cartridge 77 and its storage disk 15 are inserted into the housing through a slot 80 formed in a front panel 79 of a housing 78 that covers the entire magneto-optical information recording/reproducing apparatus.

Here, the cartridge 77 will be explained in detail based on FIGS. 11(a) to 13.

As is clear from FIGS. 11(a) and (b), the cartridge 77 has a main body 83 formed as a flat rectangular plate as a whole, and the disk 15 is rotatably housed within the main body. has been done. A substantially circular hole 84 is formed at substantially the center of both the front and back surfaces of the main body 83, and the center of the disk 15 is exposed through the chain hole.
5 can be placed on a disk supporting surface 85 (shown in FIG. 3) of a turntable 66 (see FIG. 3, etc.) to rotate (drive) the disk. In addition, the main body 8
A substantially rectangular opening 87 communicating with the hole 84 is formed in the main surface of the disc 3, and the recording/reproducing means described above can access the disk 15 through this opening 87.

A lid 88 that can close the opening 87 and the hole 84 is provided on the main body 83, and in the Z direction and the opposite direction, the opening 87 is located at a position where the hole 84 is closed and opened. It can be slid freely between positions. Further, as shown in FIG. 11, the lid body 88 has an opening 8.
A coil spring 89 is connected as a biasing means for biasing the lid in the direction of closing the hole 7 and the hole 84 (in the direction of arrow Z).

The lid body 88 is made of stainless steel f! 4! Ii2, etc., and as is particularly clear from FIGS. 11 and 12, the main body 83
A base part 90 that is slidably engaged with the end in the insertion direction into the slot 80 described above, and a closing part 91 that is formed integrally with the base part and can close the opening 87 and hole 84 of the main body 83. Become.

For the cartridge 77 configured in this manner, there is a direction in the housing 78 that opens the opening 87 and the hole 84 when the cartridge is inserted into the housing through the slot 80 (shown in FIG. 10). Lid body 88
A lid moving means is provided for moving the lid using its insertion force.

This lid moving means will be explained. Figure 11.

As shown in FIGS. 13 to 16, the lid moving means is provided in the housing 78 so as to be able to swing freely relative to each other around support shafts 93 and 94, and is provided in the cartridge insertion path.
A pair of lever members 95 and 96 are provided to be inclined with respect to the direction of the arrow Y), and a base portion 90 of the lid body 88 (see FIG. A pin 99 that can be fitted into a notch 98 formed in the
100, and a coil spring 101 that applies a bias tension to both lever members. That is, when the cartridge 77 is inserted through the slot 80 (shown in FIG. 10) in the direction opposite to the arrow Y, one lever member, in this case lever member 9, as shown in FIGS. 11 and 13.
A pin 99 protruding from the free end of 5 fits into the notch 98 of the base portion 90, and as the cartridge 77 is inserted, the lever member swings in the direction of arrow U (also shown in FIG. 14). The cover body 88 is moved in the opening direction (counter-arrow Z direction). Further, the pin 100 protruding from the other lever member 96 comes into contact with the insertion direction end of the main body 83 of the cartridge 77, and as the lever member swings in the direction of arrow W, the insertion direction end It slides on the base part 90 and rides on the base part 90.

The above explanation is for recording or reproducing on, for example, side A of the disc 15. When recording or reproducing on the 8th side of the disc 15, the cartridge 77 is turned over and inserted into the slot 80. (shown in Figure 10). Then, the lid 88 is moved in the opening direction by the other lever part 96, which did not operate when recording and reproducing side A, and its protruding bottle 100. Note that the cartridge 77 is inserted into the slot 80 (the 10th slot).
(Illustrated) When pulled out, each lever member 95 and 9
6 is returned to its original rest position (the position shown in FIG. 14) by a coil spring 101 shown in FIG.

As is clear from FIG.
Recesses 104 and 105 are formed corresponding to the connecting portion 103 between the base portion 90 and the closing portion 91 . As described above, the nine pins protruding from one lever member, for example, the lever member 95, fit into the notch 98 formed in the base portion 90 of the lid 88, and the lid opens in the opening direction. When moving the
The pin 100 protruding from the other lever member 96 slides on the insertion direction end of the main body 83 of the cartridge 77 and then rides on the base body 90 . As is clear from FIGS. 12 and 13, the connecting portion 103 between the base portion 90 and the closing portion 91 is sharp. Therefore, when the pin 100 rides on the base portion 90, it is likely to get caught in the connecting portion 103. However, as described above, the pin 100 or 99 has a portion corresponding to the coupling portion 103 in the recess 10.
5.104, and the pins 99, 100 and the connecting portion 103 do not engage with each other.

Next, the cartridge 77 inserted through the slot 80 (shown in FIG. 10), which is provided in the housing 78 together with the above-mentioned recording and reproducing means, is guided to the recording and reproducing position together with the disc 15 therein, and the disc is placed on the turntable 6.
6 (see FIG. 3, etc.), the guide conveyance means for conveying and placing the disk on the disk holding surface 85 will be explained.

Figures 15 to 20 (a), (b), (c
), at both ends of the frame 1 in the transverse direction (direction of arrow Z and its opposite direction), which are the main constituent members of the recording and reproducing means, there are two sheets, which are the main constituent members of the guiding and conveying means. Vertical chassis 106 and 1 (7) are fixedly installed. FIG. 19 shows the general arrangement of each member, and the shape of each member is schematically shown in this figure. A pair of flat plate-shaped moving members 109 and 110 are disposed on the outside of each of these vertical chassis 106 and 107, and are arranged in the insertion direction of the cartridge 77 (
It is attached to each chassis so as to be able to reciprocate along the arrow Y direction). Details of these moving members 109, 110 are shown in FIGS. 21 and 22. To explain in detail how each of the moving members 109 and 110 is attached to the vertical chassis 106, 107, as is particularly clear from FIGS. A plurality of elongated holes 111 and 112 extending in the opposite direction) are formed, and the vertical chassis 1
The same number of pins 113 protruding from each outer surface of 06.107
．． The elongated hole is slidably engaged with 114.

As shown in FIGS. 14, 16, and 22, at the rear end of one of the pair of moving members 109 and 110, there is a section extending along the moving direction of the moving member. A rack member 116 is attached thereto. On the other hand, as shown in FIGS. 14 and 16, a gear transmission mechanism 117 including a final gear that meshes with the rack member 116, and a worm 118 that meshes with the first gear of the gear transmission mechanism are attached to its output shaft. A fitted motor 119 is attached to the vertical chassis 106. These rack members 116. @Car transmission mechanism 117. The worm 118 and the motor 119 constitute a driving force applying means for applying a driving force to the moving member 109.

As shown in FIGS. 14 to 17 and 19, the pair of moving members 109 and 110 described above is an interlocking mechanism consisting of a shaft 122 and a pair of lever members 123 and 124 provided at both ends of the shaft. They are interlocked with each other by a mechanism.

To explain in detail, the shaft 122 is a double-column moving member 109° 11
0 and both longitudinal chassis 106 and 107
It is rotatably supported by. Each lever member 123, 124 is firmly connected at one end to one end of the shaft 122, and pins 125, 126 protruding from the inner surface of each other end are connected to each moving member. 109
, 110, respectively. That is, the driving force applied to one moving member 109 by a driving force applying means such as a motor 119 is transmitted to the other moving member 110 via the interlocking mechanism, and both pillar moving members 109 and 110 are interlocked. It is.

As shown in FIGS. 14 to 19, vertical shears 106, 107 and moving members 109, provided in pairs,
The cartridge holder 13 is sandwiched by the cartridge holder 110.
1, and in the direction of the arrow X and the opposite direction, that is, the disk supporting surface 85 of the turntable 66.
It is attached to the longitudinal chassis 106, 107 so as to be movable in a direction perpendicular to (third figure). 23rd
Details of the cartridge holder 131 are shown in Figures (a) to (C). This cartridge holder 131 is
It carries a cartridge 77 inserted into the housing 78 through a slot 80 (10th illustration).

Specifically, as shown in FIGS. 15, 16, and 23(a) to C), a total of three pins 132 are provided protruding from both sides of the cartridge holder 131. On the other hand, as shown in FIGS. 15, 16, 20(b) and (c), the vertical chassis 106.107 has a notch 134.1 extending in the direction of the arrow X and in the opposite direction.
35 is formed, and when the pin 132 is slidably engaged with each of the notches, the cartridge holder 131
is attached to each vertical chassis 106,107.

Each pin 132 further protrudes outward from each vertical chassis 106, 107 through the notch 134, 135, and also extends through a cam hole 137 formed in the movable members 109, 110.
, 138 in a slidable manner. The cam holes 134 and 135 are formed so as to have inclined portions extending in the direction of the arrow Y and slanting in the direction of the arrow X. In other words, the cartridge holder 131 is moved in the direction of the arrow X and the opposite direction by the movement of the re-moving members 109 and 110 (reciprocating movement in the direction of the arrow Y and the opposite direction).

The above-mentioned moving members 109, 110, a driving force applying means including the morph 119 and applying a driving force to the moving members, a shaft 122 and lever members 123, 124 for interlocking the re-moving members 109, 110. Guidance for guiding the cartridge 77 together with the disc 15 stored therein to the recording/reproducing position by the interlocking mechanism and the cartridge holder 131, and transporting and placing the disc on the disc carrying surface 85 (shown in the third figure) of the turntable 66. A conveying means is configured. The guide conveyance means also includes a lid moving means (described above) that moves the lid 88 provided on the cartridge 77 in the opening direction using the cartridge insertion force.

Next, the turntable 66 is moved by the guiding conveyance means.
A clamp mechanism for clamping the disk 15 placed above will be explained.

As shown in FIGS. 14 and 19, a substantially flat support member 140 is swingably attached to a shaft 122 for interlocking a pair of moving members 109 and 110. Two support pins 141 extending parallel to the shaft 122 are provided at the free end of the support member 140, and an intermediate member 142 formed in a flat plate shape is swingably supported by the two pins. This intermediate member 1
A disc-shaped suppressing member 143 for pressing the disc 15 against the turntable 66 is rotatably attached to the disc 42 . Further, the suppression member 143 is connected to the turntable 66
Spring member 14 that urges support member 140 to approach
4 is fitted onto the shaft 122. As shown in FIGS. 14 and 15, a small shaft 145 is provided at one end of the support member 140, and a cam portion 146 (shown in FIGS. 15 and 21) formed on the moving member 110
The small shaft is engaged with. That is, the moving member 1
10 moves, the support member 140 swings.

The shaft 122 described above, the support member 140 including the support pin 141, the intermediate member 142, the pressing member 143,
The spring member 144 constitutes a clamp mechanism.

As shown in FIG. 15, a protruding lever 147 and an intermediate lever 148 are disposed near the rear end of the housing 78, and are connected via pins 149 and 150 extending in the Z direction and the opposite direction, respectively. Vertical chassis 10
It is rotatably attached to 7. Projection lever 147
The pivot end 151 engages with the insertion direction end of the cartridge 77 (see FIG. 11). Further, the other rotating end of the protruding lever 147 is pivotally connected to one rotating end of the intermediate lever 148 by a pin 152. Protruding lever 1
47 and the detection switch 15 near the intermediate lever 148.
4 are arranged, and the other rotating end 1 of the intermediate lever 148
55 can be engaged with an actuator 156 of this detection switch 154.

The intermediate lever 148 includes the intermediate lever and the protruding lever 1.
A coil spring 158 is connected to the coil spring 158 for biasing the cartridge 77 in the counterclockwise direction in FIG. 15 to move the cartridge 77 in the direction of arrow Y.

The above-mentioned protruding lever 147, intermediate lever 148, and coil spring 158 constitute protruding means for protruding the cartridge 77 out of the housing 78.

As shown in FIGS. 15 and 21, the moving member 110
An L-shaped hole 160 is formed in the L-shaped hole, and a pin 152 that pivots the protruding lever 147 and intermediate lever 148 together is slidably fitted into the L-shaped hole.
The shaped hole 160 consists of a fruit portion 161 that extends in the direction of the arrow Y and the opposite direction, and a nub portion 162 that extends in the direction of the arrow X and the opposite direction. When the cartridge 77 is inserted into the housing 78 and its insertion direction end engages with one rotating end of the protrusion lever 147, the protrusion lever 14
7 and the intermediate lever 148 are rotated clockwise in FIG. 15 against the pulling force of the coil spring 158 by this insertion force. Then, the pin 152 moves from the position shown in FIG.
2 and reaches the intersection of the continuous portion 162 and the manufactured portion 161. Therefore, after this, when the moving member 110 moves in the direction of the arrow Y to transport the disk, the manufacturing part 161 supports the pin 152 and is urged by the coil spring 158 to rotate counterclockwise in FIG. The protruding lever 147 and the intermediate lever 148 are locked in that position.

Further, as described above, when the cartridge 77 is inserted and the intermediate lever 148 rotates together with the protruding lever 147 in the clockwise direction in FIG. 15, the other rotating end 155 of the intermediate lever operates the detection switch 154. .

This detection switch 154 functions as a detection means for detecting that the cartridge 77 is inserted into the housing 78.

Figures 14 to 16 and Figures 23 (a) and (b)
, as shown in (C), the cartridge holder 1
A pair of leaf springs 165 are provided on both sides of the cartridge holder 31 for frictional contact with the cartridge 77 carried on the cartridge holder. Lid body 88 provided on cartridge 77
A coil spring 89 (shown in FIG. 11) biases the lid (shown in FIG. 11, etc.) in the closing direction, and a coil spring 101 (shown in FIG. 14) serves to push the cartridge 77 out of the housing 78.

The above-mentioned temporary spring 165 is each of these coil springs 8
It acts as a movement suppressing means for suppressing the movement of the cartridge relative to the housing 78 against the pushing force (acting in the direction of arrow Y) applied to the cartridge 77 by the cartridges 9 and 101.

Next, a magnetic field applying means for applying a magnetic field in the opposite direction to the perpendicularly magnetized film provided on the disk 15 will be described.

As shown in FIGS. 14 to 16 and FIG. 19, a support 167 bent in a U-shape is disposed behind the clamp mechanism described above, and the support body 167 is bent in a U-shape. It is attached so that it can freely reciprocate in the direction of arrow X and in the opposite direction. For details, see Figure 15.

As shown in FIGS. 16 and 19, support 167
Three notches 168 extending in the direction of arrow X and the opposite direction are formed on both sides of the cartridge holder 131, and three pins 169 protruding from both sides of the cartridge holder 131 are formed.
(Also shown in FIGS. 23(a) to 23(c)) are slidably engaged with the notches. As shown in FIGS. 15, 16, and 19, a pair of pins 170 are protruded from both sides of the support 167 along with the above-mentioned notch 168, and are located on both sides of the cartridge holder 131. Cam holes 171.1 formed in each of the moving members 109 and 110
The pin is slidably engaged with 72. This cam hole 1
Similar to the pond cam holes 137 and 138, the holes 71 and 172 are formed to have inclined portions that are inclined in the direction of the arrow Y and in the direction of the arrow X. That is, the removable member 109,
By reciprocating the support member 110 (in the direction of the arrow Y and the opposite direction), the support body 167 moves in the direction of the arrow X and the opposite direction. As shown in FIGS. 15, 16, 21, and 22, the removable member 109 and 110 have three pins 169 protruding from both sides of the cartridge holder 131.
Three diagonal holes 175, 176 are formed corresponding to the locus of movement, and each pin moves within each diagonal hole while maintaining a predetermined clearance.

As shown in FIG. 14, a U-shaped intermediate portion 4178 is provided at the center of the support 167, and the intermediate member includes sliders 179, 180.
A pair of flat magnets 181 and 182 are attached so as to be able to reciprocate in the direction of arrow Z and in the opposite direction. The two-handed plate-shaped magnets 181 and 182 extend parallel to the movement path (in the direction of arrow Y and the opposite direction) of the pickup body 7 (shown in FIG. They are arranged so that their magnetic poles are in opposite directions. Further, each plate-shaped magnet moves along the perpendicular magnetization film of the disk 15.

The above-described intermediate member 178 and sliders 179, 180 are collectively referred to as a support mechanism that movably supports both magnets 181, 182.

As shown in FIGS. 14 and 18, behind a pair of flat magnets 181, 182, a pair of solenoid plungers 186. 187 is arranged and attached to the cartridge holder 131. Both solenoid plungers are connected to the support mechanism (intermediate member 17) so as to move the pair of magnets 181, 182 (in the direction of arrow Z and in the opposite direction).
8 and sliders 179 and 180). In addition, both solenoid plungers 186
, 187 is provided with a lever 190 that swings in the Y-Z plane around the 18 support bins. A pair of detection switches 195 and 196 are arranged on both sides of the lever 190 so that the free end of the lever engages with its actuator 192.i93.

The above-described solenoid plungers 186 and 187, a support mechanism including the intermediate member 178 and the like and driven by the solenoid plungers, and flat magnets 181 and 182.
This constitutes a magnetic field applying means that applies a bias magnetic field in the forward and reverse directions to the perpendicularly magnetized film provided on the disk 15 and magnetized in advance in a predetermined direction. In addition, the output shafts 184, 18 of the solenoid plungers 186, 187
The protrusion operation 5 is performed while the disk 15 rotates once.

As shown in FIGS. 2 and 17, a magnetic shielding member made of a material having high magnetic permeability is provided to cover the magnet 62 and yoke 63, which serve as magnetic field applying means for servo driving the objective lens 58. 199 is provided. The magnetic shielding member is located between this magnet 62 and the above-described flat magnets 181 and 182,
Leakage magnetic flux from both magnets is absorbed by the magnetic shielding member.

As is clear from the above description, the magnetic field applying means including the flat magnets 181 and 182 and the pickup body 7 (shown in FIGS. 2, 3, etc.) are connected to the sloft 80 ( The turntable 66 (shown in FIG. 3, etc.) and the clamp mechanism are arranged on the slot side with respect to the magnetic field applying means and the pickup body 7. has been done. Regarding the positional relationship of the support member 140, which is a component of the clamping machine (?), and the shaft 122 that swingably supports the support member, the shaft is located on the slot/throat 80 side with respect to the support member 140. positioned.

Next, the operation of the magneto-optical information recording and reproducing apparatus having the above-described configuration will be briefly explained along with the performance procedure.

First, as shown in FIG. 10, the cartridge 77 containing the disc 15 to be recorded or reproduced is inserted.
It is inserted into the housing 78 from the slot 80 and carried on the cartridge holder 131 (shown in FIG. 17, etc.). Along with this insertion, the lid 88 of the cartridge 77 is moved in the opening direction by the action of the lever members 95, 96 shown in FIG. 14 and the like. Immediately before the cartridge 77 is completely inserted into the housing 78, the insertion direction end of the cartridge is inserted into the protruding lever 147 shown in FIG.
The protruding lever 147 and the intermediate lever 148 rotate clockwise in FIG. 15 against the biasing force of the coil spring 158. As a result, the detection switch 154 shown in FIG. 15 operates,
Motor 119 (shown in FIGS. 15 and 16) rotates.

Therefore, the pair of moving members 109 and 110 are moved in the direction of the arrow Y, and the cam holes 137 formed in the six moving members are moved.
, 138, the cartridge holder 131 carrying the cartridge 77 moves in the opposite direction of arrow Z, and the disk 15 moves onto the disk supporting surface 85 of the turntable 66.
(Third figure shown) is placed on top. On the other hand, Figures 15 and 21
As is clear from the figure, as the movable member 110 moves in the direction of arrow Y, the cam portion 14 formed on the movable member
6, the supporting member 140 including the small shaft 145 engaged therewith swings substantially in the opposite direction of the arrow X, thereby clamping the disk.

Recording and playback are possible in this state.

When the operation signal to start recording or playback is issued,
The pickup body 7 begins to move and recording or reproduction begins. When recording, the pair of flat magnets 181 and 182 shown in FIG. The magnetization direction of the bias magnetic field applied to the magnetized film is switched.

When recording or reproduction is completed, the cartridge 77 and the disc 15 containing it are returned by following the process completely reverse to that described above. The cartridge 77 is projected out of the housing 78 and recovered by a projection means shown in FIG. 15, which includes a projection lever 147 and a coil spring 158 biasing the projection lever.

In this embodiment, as shown in FIG. 13, pins 99.96 protrude from the lever members 95.96. ioo
Although the pin has a generally cylindrical shape, the pin may be formed into a conical shape as shown in FIG.

Effects of the Invention As detailed above, the magneto-optical information recording apparatus according to the present invention includes a magnetic field applying means (for applying a magnetic field in a direction opposite to the direction of magnetization of the perpendicularly magnetized film of the recording medium (disk 15) during recording on the perpendicularly magnetized film of the recording medium (disk 15). (including flat magnets 184 and 182);
It also has other magnetic field applying means (magnet 62, etc.) for driving the objective lens servo, and a magnetic shielding member (199) is interposed between the two magnetic field applying means. Therefore, leakage magnetic flux from both magnetic field applying means is absorbed by this magnetic shielding member, and both magnetic field applying means do not adversely affect each other.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the recording/reproducing section of the magneto-optical information recording/reproducing apparatus according to the present invention, FIGS. 2 and 3 are sectional views taken along the lines 1--2 and 1--2, respectively, and FIG. 4. 5 to 9 are partial detailed views of the recording/reproducing section, FIG. 10 is a schematic overall perspective view of the magneto-optical information recording/reproducing apparatus, and FIG. 11 to 13 are diagrams for explaining the disk storage cartridge, FIG. 14 is a plan view of the internal structure including the recording and reproducing section, and FIGS. View, X
VI-XVI arrow view, X■-X■ lost trace diagram and X■-X■
The arrow views and FIGS. 19 to 24 are partially detailed views of the interior. Explanation of symbols of main parts 5.6...Support rail 7...Pickup body 8. 9...Steel roller, 3...Spring member 15...Disc 16...Longitudinal magnet L7, 18...Longitudinal yoke 20... Longitudinal magnetic circuit 21...Drive coil 22...Detection coil 25...Holding member 27...Laser diode 28...Two collimator lenses... ... Condensing lens 30 ... Light receiving element 31 ... Complex prism 32 ... Astigmatism element 34 ... Monitor light receiving element 43.44.45. ...V-shaped groove 48...
・First prism 49...Second prism 50...Circular correction surface 51...Total reflection surface 52...Polarization reflection surface 58...Objective lens 65-...Flexible printed circuit board 66...Turntable 71...Rack portion 72.116...Rack member 77...Cartridge 78... ... Housing 80 ... Slot 83 ... Main body 84 ... Hole 87 ... Opening 88 ... Lid body 89, 101, 158・・・・・・Coil spring 9
0... Base part 91... Closing part 93.94... Support shaft 95.96, 123, 124... Lever member 99
．． 100...Pin 103...Connection part 104.105...Four parts 106.107...Vertical chassis 109.110
...Moving member 117...Gear transmission mechanism 119...Motor 122...Shaft 131...Cartridge holder 137, 138, 171, 172-... ...Cam hole 1
40...Support member 143...Press member 144-...Spring member 147...Protrusion lever 154.195.196...Detection switch 165
...Temporary spring 178...Intermediate member 179.180...Slider 181.182...Small flat magnet 184.185
... Output shaft: +86.187 ... Solenoid plunger 19
9-...Magnetic shielding member E- Author, Figure 5 tail l = concave υ1 QLL 4j
ζ5 ear, 12 concave saw) 3 tail 142 i, no52J funeral a/6 concave L2/concave dragon 22 concave

Claims (1)

[Claims] A light that records information by applying a magnetic field in the opposite direction to a recording medium that includes a perpendicularly magnetized film that has been magnetized in a predetermined direction using a light emitting device while applying a magnetic field in the opposite direction using a light emitting device. A magnetic information recording device, comprising a plurality of optical elements including a light emitting element and an objective lens that focuses irradiation light emitted from the light emitting element onto the perpendicularly magnetized film, a coil and other magnetic field applying means for applying a magnetic field to the coil. a servo drive mechanism that servo drives the objective lens by electromagnetic force; a holding member that holds at least the objective lens and the servo drive mechanism and moves along the perpendicular magnetization film; A magneto-optical information recording device characterized in that a magnetic shielding member is interposed between other magnetic field applying means.