JP2551566B2 - Cartridge for magneto-optical disk - Google Patents

Description

The present invention relates to a disk cartridge suitable for housing a magneto-optical disk.

[Conventional technology]

Magneto-optical discs, which utilize the thermo-magnetic effect and can repeatedly erase and rewrite information signals, are being put to practical use.

This magneto-optical disk transfers a resin layer having a guide groove for tracking and an addressing pit for track address formed on the surface of a transparent substrate such as glass, and the surface of the resin layer is made of a magneto-optical recording material. A thin film is formed, and the thermomagnetic effect of the magneto-optical recording material is applied to write and erase information signals.

That is, as shown in FIG. 11 (a), a magnetic field H is applied to the magnetic coil 30 in the direction in which the perpendicular magnetic recording medium 31 is desired to be magnetized by passing a current I, and as shown in FIG. When the portion of the magnetic recording medium 31 to be recorded is irradiated with the laser beam 33 from the laser head 32 and the temperature of the portion is raised to near the Curie point, the direction of the magnetization M of the perpendicular magnetic recording medium 31 is reversed by the thermomagnetic effect. To do. When the linearly polarized laser light is reflected from the magnetic pole, the plane of polarization is rotated by the direction of the magnetization M (Kerr effect). Therefore, the rotation of this plane of polarization is passed through an analyzer and an output device to obtain the intensity of the light. Can be expressed as Therefore, as shown in FIG. 11 (c), the magnetization M is formed on the perpendicular magnetic recording medium 31 in a pattern according to a required information signal.
If the direction of is reversed, this can be used as a recording pit. On the contrary, if a magnetic field in the opposite direction is applied to the part where the direction of the magnetization M is once reversed and the temperature is raised to the vicinity of the Curie point, the direction of the external magnetization M is reversed again and the information signal is erased. You can

FIG. 12 is an optical circuit diagram of an optical device for recording / reproducing information on / from the magneto-optical recording medium 31, wherein 30 is a magnetic coil, 32 is a laser head, 34 is a laser, and 35 and 36 are beam splitters. , 37 is an analyzer, 38 is an output device, 39 is a pit signal detection system, and 40 is a magneto-optical disk having the perpendicular magnetic recording medium 31.

As described above, the recording / reproducing apparatus for the magneto-optical disk has
Magnetic coil for applying magnetization H to the perpendicular magnetic recording medium 31
30 and a laser head 32 for heating the perpendicular magnetic recording medium 31. The magnetic coil 30 and the laser head 32 can be arranged in parallel on one side of the magneto-optical disk, but from the viewpoint of easiness of manufacturing and the like, as shown in FIG. It is preferable to dispose the laser head 32 facing each other and to dispose the magnetic coil 30 facing the upper surface of the magneto-optical disc 40.

By the way, as a disk cartridge which rotatably accommodates such a magneto-optical disk, a disk cartridge as shown in FIG. 13 has been conventionally used (JP-A-58-150963).

In this figure, reference numeral 41 is a synthetic resin cartridge case, 40 is a magneto-optical disk rotatably housed in the cartridge case 61, and 43 is a shutter for opening and closing a window hole formed in the cartridge case 41 together. .

As shown in FIGS. 13 and 14, the cartridge case 41 is formed by superposing an upper case 44 and a lower case 45, which are formed in a shallow dish shape, in opposition to each other. The magneto-optical disk 40 and other components are housed. A window hole 46 is formed in each of the upper case 44 and the lower case 45 at a substantially central portion corresponding to the rotation center of the magneto-optical disc 40. The front edges of the upper case 44 and the lower case 45, that is, the side edges 48 on the insertion side into the recording / reproducing apparatus.
A connecting portion 49 that extends horizontally from the surfaces of the upper case 44 and the lower case 45 is formed between the upper case 44 and the lower case 45 at one end 47a of the head insertion hole 47. Since the structure of the shutter 43 and the means for attaching it to the cartridge case 41 are not directly related to the subject matter of the present application, detailed description thereof will be omitted.

In the conventional disk cartridge described above, the shutter 43 is opened in association with the insertion operation into the recording / reproducing apparatus, and the spindle provided in the recording / reproducing apparatus through the window hole 46 opened in the upper case 44 and the lower case 45. Is inserted, and the magneto-optical disc 40 is held in a rotatable state. Then, the 14th
As shown in the figure, the electromagnetic coil 30 and the laser head 32 are inserted from the outside of the head insertion holes 47 formed in the upper case 44 and the lower case 45 to the positions facing both the front and back surfaces of the magneto-optical disk 40, and the information signal Is ready for recording and playback.

[Problems of conventional technology]

The above-mentioned conventional disk cartridge is the upper case 44
And since the connecting portion 49 that extends horizontally from the surfaces of the upper case 44 and the lower case 46 is formed at the side edge portion 48 on the insertion side of the lower case 45, the electromagnetic coil 30 and the laser head 32 are connected to the magneto-optical disk 40. In order to set at a predetermined position, the electromagnetic coil 30 and the laser head 32 are configured to be movable up and down with respect to the magneto-optical disc 40 as shown in FIG. 15, and first, as shown in FIG. 30 and the laser head 32 with the gap L extended, and after insertion,
As shown in FIG. 15, the electromagnetic coil 30 and the laser head are
There is no choice but to move 32 inwardly and insert them into the cartridge case 41. Therefore, the structure of the carriage for holding and transferring the electromagnetic coil 30 and the laser head 32 becomes complicated and the recording / reproducing apparatus becomes large, and the positioning accuracy of the magneto-optical disk 40 and the electromagnetic coil 30 and the laser head 32 is poor. There is a problem.

[Means for solving problems]

The present invention solves the above-mentioned problems and provides a disc cartridge suitable for accommodating a magneto-optical disc. Therefore, the window is formed in a shallow dish and has a long hole-shaped window extending from the substantially central portion toward the front edge portion. An upper case and a lower case made of synthetic resin having holes formed therein, a slider made of synthetic resin slidably attached along the front edge of a cartridge case formed by joining these cases, In a magneto-optical disk cartridge having a shutter attached to a slider and opening and closing the window hole according to the sliding movement of the slider, the window is formed in a portion of the front edge of the upper case and the lower case facing the window hole. A reinforcing portion thinner than the portion facing both sides of the hole is integrally formed, and at the time of opening the shutter, the portion facing the reinforcing portion has a thickness equal to that of the reinforcing body. A slider connecting portion is formed with is, is characterized in that the slidably mounted to the upper case and lower case.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

First, referring to FIG. 1, an outline of the disk cartridge according to the present invention will be described. The disk cartridge is a synthetic resin cartridge case 1 and a magneto-optical disk rotatably housed in the cartridge cartridge case 1. 2 and a shutter 4 that opens and closes a window hole 3 opened in the cartridge case 1.

The cartridge case 1 is, as shown in FIG.
It consists of an upper case 5 and a lower case 6, and these both cases 5,
A space for accommodating the magneto-optical disc 2 and other required components is formed by joining the 6 with a plurality of joining screws (not shown).

As shown in FIG. 2, the lower case 6 extends from a substantially central portion corresponding to the rotation center P of the disk-shaped recording medium 2 toward a front edge 7 (a side on the insertion side into the recording / reproducing apparatus). A hole-shaped window hole 3 is opened. The width W of the window 3 is formed so that a spindle for rotating the magneto-optical disc 2 and an electromagnetic coil and a laser head for recording / reproducing information signals on / from the magneto-optical disc 2 can be inserted. To be done.

As shown in FIGS. 2 and 3, a joining wall 9 having a constant height is erected on the outer peripheral edge of the lower case 6 excluding the front edge 7, and the magneto-optical disk 2 is provided with the joining wall 9. A partition 10 having the same height as that of the joining wall 9 is provided upright on the circumference centered on the rotation center P.

At a portion of the front edge of the lower case 6 facing the window hole 3, a reinforcing portion 11 thinner than the thickness T of the lower case 6 is made flush with the joining wall 9 and the tip of the partition wall 10. Guide rails 12 and 12a for guiding a slider, which will be described in detail later, are formed in a straight line on both left and right sides of the front edge of the reinforcing portion 11 except the portion facing the window hole 3. Has been formed. The reinforcing portion 11 can be formed to have an arbitrary thickness as long as it is 1 or less within about 2 minutes of the set interval of the electromagnetic coil and the laser head. However, the magneto-optical disc housed in the cartridge case 1 can be formed. It is more preferable to set the thickness to half or less of the thickness of 2.

On the other hand, the upper case 5 is formed in substantially the same shape as that of the case 6 except that each member is provided at a symmetrical position.

 Next, the configuration of the shutter 4 will be described.

As shown in FIG. 4, the shutter 4 has a length capable of simultaneously covering the entire window hole 3 of the cartridge case 1 by bending a thin metal plate such as stainless steel into a U-shape. The upper piece 4a and the lower piece 4b are formed via the connecting piece 4c. In the connecting piece 4c, a through hole 13 for inserting the shutter opening / closing arm provided in the recording / reproducing apparatus is formed in the substantially central portion, and screw insertion holes 14, 14a are formed on both sides thereof.
Has been established.

In the shutter 4, a slider, which will be described in detail later, is attached to the connecting piece 4c, the slider is slidably attached to the guide rails 12 and 12a, and the upper piece 4a and the lower piece 4b are superposed on both sides of the cartridge case, respectively. . After that, Shattered 4
By attaching the elongated holding plate 15 to the cartridge case 1 so as to cover the tip of the cartridge case 1,
It can be attached to open and close freely.

As shown in FIG. 5, the slider 16 is provided at both ends of a connecting portion 17 having a length substantially equal to the width W of the window hole 3 and a width substantially equal to the thickness D of the front edge of the cartridge case 1. The sliding portions 19, 19a having the recessed grooves 18, 18a which can be extended over the guide rails 12, 12a are formed. Of course, when the thickness D of the front edge of the cartridge case 1 is formed to be substantially equal to that of the magneto-optical disk 2, the thickness of the connecting portion 17 is also approximately equal to that of the magneto-optical disk 2. It is formed.

One of the two sliding portions 19 and 19a has a length substantially equal to the lateral width A of the shutter 4, and has a through hole 13 formed in the shutter at the center of the front surface. Corresponding recessed portions 20 are provided as recesses, and screw holes 21, 21a corresponding to the screw insertion holes 14, 14a opened in the shutter 4 are formed at both ends thereof. The shutter 4 has the screw insertion holes 14, 14a.
It is attached by screwing the more inserted screws 22, 22a into the screw holes 21, 21a.

Of the slider 16, at least the sliding portions 19, 19a
Is, for example, nylon or polyacetal,
It is formed with a synthetic resin having excellent lubricity. As shown in FIG. 1, the slider 16 is attached to the guide rails 12 and 12a with the sliding portion 19 to which the shutter 4 is attached facing the opening side of the shutter 4.

In the disk cartridge constructed as described above, when the shutter 4 is opened, a step portion 23 communicating with the window hole 3 is formed on the front edge side of the window hole 3 as shown in FIG. The thickness D of the portion is formed thinner than the set interval of the recording / reproducing head.

In the disk cartridge according to the above-mentioned embodiment, the thickness D of the portion of the cartridge edge case 1 facing the window hole 3 at the front edge is made smaller than the set interval of the recording / reproducing head. It is possible to insert the electromagnetic coil and the laser head, which are arranged in the above, into the cartridge case 1. Therefore, it is not necessary to vertically drive the electric coil and the laser head with respect to the window hole 6 formed in the cartridge case 1 as in the conventional case, and the recording / reproducing apparatus is downsized and the magneto-optical disk 2 and the electromagnetic coil are used. Also, the setting accuracy of the laser bed can be improved. In addition, since the spindle for rotating the magneto-optical disc 2 and the window for inserting the electromagnetic coil and the laser head for writing and reading the information signal to and from the magneto-optical disc 2 are formed in series, the spindle and the electromagnetic The coil and the laser head can be arranged close to each other, and the recording density can be improved.

The second embodiment of the present invention will be described below with reference to FIGS. 7 to 10.

FIG. 7 is a perspective view of a slider applied to the disk cartridge according to the second embodiment. As shown in FIG.
This slider 16 has a shutter opening / closing function provided in the recording / reproducing apparatus on the front side of one sliding portion 19a of the two sliding portions 19, 19a formed at both ends of the connecting portion 17, to which the shutter 4 is not attached. A recess 24 for engaging the arm is provided, and a recess 20 provided in the other sliding portion 19 is omitted.

FIG. 8 is a plan view seen from the inside of the lower case applied to the day skirt ledge of the second embodiment. As shown in FIG. 8, the front edge of one of the guide rails 12a is cut away, A space 25 is formed in the portion for inserting the shutter opening / closing arm and operating it left and right. On the other hand, although not shown, a void similar to the void 25 is also formed at the symmetrical position of the upper case 5.

In the disk cartridge according to the second embodiment, one of the guide rails 12 and 12a formed on the upper case 5 and the lower case 6 is provided with one sliding portion 19 on which the shutter 4 is attached. Assembling is carried out so as to straddle the other sliding portion 19a on which the shutter 4 is not attached to the other guide rail 12a.

In the disk cartridge according to the second embodiment, as shown in FIG. 9, the recess 24 formed in the slider 16 is exposed at the front edge of the cartridge case 1. Therefore, as shown in FIG. 10, by inserting the shutter opening / closing arm 26 into the recess 24 and pressing the side surface of the recess 24 with the shutter opening / closing lever 26, the shutter 4 can be opened / closed.

The gist of the present invention lies in that the front edge of the cartridge case 1 is made thinner than the other parts when the shutter is opened, and the other parts of the upper case and the lower case are The shape and structure, the shape and material of the shutter and the slider, and the connecting means are not limited to those in the above embodiment.

Further, the disk cartridge according to the present invention is particularly effective as a cartridge cartridge for a magneto-optical disk, but it can also be applied to a disk cartridge containing another disk-shaped recording medium.

〔The invention's effect〕

As described above, in the magneto-optical disk cartridge of the present invention, the reinforcing portion that is thinner than the portion facing both sides of the window hole is integrally formed in the portion of the cartridge case facing the window hole at the front edge. At the same time, since the connecting portion having the same thickness as the reinforcing body is formed in a part of the slider facing the reinforcing portion when the shutter is opened, the portion facing the window hole at the front edge of the cartridge case when the shutter is opened. In addition, it is possible to form a step portion that is one step lower than the portion facing both sides of the window hole. Therefore, it is possible to insert the electromagnetic coil and the laser head into the window through the step portion, and it is not necessary to drive the electromagnetic coil and the laser head in the direction of approaching or separating from each other. It is possible to achieve simplification and miniaturization. Further, the positioning accuracy of the magneto-optical disk with the electromagnetic coil and the laser head can be improved.

Further, since the reinforcing portions are integrally formed at the front edges of the upper case and the lower case, the number of parts can be reduced as compared with the case where the reinforcing body is formed as a separate part, and the disc cartridge can be manufactured at low cost.

Further, the magneto-optical disk cartridge of the present invention,
Since the slider made of synthetic resin is slidably attached to the upper case and the lower case made of synthetic resin, harmful dust is not generated due to the sliding of the slider, and the magneto-optical disk is effectively protected.

[Brief description of drawings]

FIG. 1 is a perspective view of a disk cartridge according to the present invention,
2 is a plan view of the lower case as seen from the inside, and FIG. 3 is a second view.
FIG. 4 is a cross-sectional view taken along the line XX in FIG. 4, FIG. 4 is a perspective view of a shutter, FIG. 5 is a perspective view showing an example of a slider applied to the disc cartridge of the present invention, and FIG. FIG. 7 is a perspective view of a slider applied to the disk cartridge according to the second embodiment, and FIG. 8 is a lower case applied to the disk cartridge according to the second embodiment. FIG. 9 is a plan view seen from the inside, and FIG. 9 is a plan view of a main part of the disk cartridge of the second embodiment.
FIG. 10 is a perspective view of an essential part showing the usage state of the disk cartridge according to the second embodiment, FIGS. 11 (a), (b) and (c) are explanatory views showing the principle of the magneto-optical disk, and FIG. FIG. 13 is a circuit diagram showing the configuration of the signal detection system of the disk, FIG. 13 is an exploded perspective view showing an example of a conventional disk cartridge, and FIG. Cartridge cross section, No.
FIG. 15 is a sectional view for explaining the problems of the conventional disc cartridge. 1: Cartridge case, 2: Disk-shaped recording medium, 3: Window hole, 4: Shutter, 5: Upper case, 6: Lower case, 7: Front edge, 9:
Joining wall, 10: Partition wall, 11: Reinforcing plate, 12: Guide rail, 13: Through hole, 14, 14a: Screw insertion hole, 15: Holding plate, 16: Slider, 17:
Connection part, 18, 18a: recessed groove, 19, 19a: sliding part, 20: recessed part, 21,
21a: screw hole, 23: stepped portion, 24: recessed portion, 25: void, 26: shutter opening / closing arm

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-258381 (JP, A) JP-A-61-39280 (JP, A) Actually developed JP-A-60-132675 (JP, U)

Claims (4)

(57) [Claims] 1. An upper case and a lower case made of synthetic resin, which are formed in a shallow plate shape and have a long hole-shaped window opening from a substantially central portion toward a front edge portion, and these cases are joined together. A slider made of synthetic resin slidably attached along the front edge of the cartridge case formed by the above, and a shutter attached to the slider and opening and closing the window hole according to the sliding of the slider. In the magneto-optical disk cartridge, a reinforcing portion which is thinner than a portion facing both sides of the window hole is integrally formed at a portion of the front edge of the upper case and the lower case facing the window hole, and the shutter is provided. When the slider is opened, a slider, in which a connecting portion having a thickness equivalent to the thickness of the reinforcing body is formed in a portion facing the reinforcing portion, is slidably attached to the upper case and the lower case. Cartridge for a magneto-optical disk, characterized in that. 2. The thickness of the reinforcing portion and the connecting portion is set to be smaller than a set interval of the electromagnetic coil and the laser head inserted into the window hole. Cartridge for magneto-optical disk. 3. The thickness of the reinforcing portion and the connecting portion is made smaller than the thickness of the magneto-optical disk housed in the cartridge case.
A cartridge for a magneto-optical disk according to the item. 4. A straight guide rail of two lines is provided at a portion of the front edges of the upper case and the lower case, which is in front of a position where the reinforcing portion is formed and which faces both sides of the reinforcing portion with the reinforcing portion interposed therebetween. And a sliding portion slidably engaged with the guide rail on the shutter mounting portion of the slider and on the opposite side thereof through the connecting portion in a straight line. The magneto-optical disk cartridge according to claim 1, wherein the slider is slidably attached to the upper case and the lower case by engaging the sliding portion.