JPH0355180Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention comprises a magnetic disk cassette in which a media disc is rotatably housed in a cassette case, and a magnetic head for reading or writing information on the media disc. The present invention relates to a magnetic recording device equipped with a magnetic disk drive.

[Prior Art] Conventionally, in this type of device, a spiral groove is provided on the surface of a hub portion provided on the inner periphery of a media disk, and this spiral groove is inserted into a needle attached to the carriage of a magnetic disk drive. There is a known device for recording and reproducing information on a media disc using a magnetic head attached to a carriage that moves integrally with the needle (International Publication No. WO85-02484).

By the way, in the above-mentioned magnetic disk drive, as shown in FIG. The motor 181 is held in a holding portion 185 at the other end, and the motor 181 is attached with an upward force applied to the motor 181 by a leaf spring 182. Then, the roller 189 of the motor 181 is brought into contact with the shaft portion 111 of the magnetic disk cassette 101 under a biased spring force, and rotational force is applied to the media disk 10.
7. In this configuration, a projection 18 is further provided on the upper part of the connecting portion 183A of the holding member 183 as a guide and support mechanism when the motor 181 rotates.
3a, and this protrusion 183a is connected to the chassis 127.
Means is provided for bringing the case of the motor 181 into contact with the lower surface of the motor 181 and against the support surface 187.

[Problems to be Solved by the Invention] However, in the above configuration, the rotating shaft 181a of the motor 181 is set parallel to the shaft portion 111, and the driving force of the motor 181 is transmitted via the roller 189. . Therefore, the shaft 111 moves up and down through the gap provided between the shaft 111 and the cassette case 103 for smooth rotation, and as a result, the media disk 107 also moves up and down.
There is a problem in that the input/output of signals read or written from a magnetic head (not shown) becomes unstable.

[Means for Solving the Problems] The present invention, which has been devised to solve the above problems, includes a magnetic disk cassette in which a media disk is rotatably supported within a cassette case via a hub portion having a shaft portion. a loading chamber provided in a drive case into which the magnetic disk cassette is loaded; a magnetic head that performs at least one of reading and writing on the media disk when the magnetic disk cassette is loaded into the loading chamber; a magnetic disk drive having a motor that comes into contact with the shaft of a cassette and rotates the media disc, the rotating shaft of the motor being inclined so as to apply an axial force to the media disc. The gist is a magnetic recording device characterized by the following.

[Operation] According to the present invention, the rotating shaft of the motor is inclined so as to apply an axial force to the media disk. Thereby, the driving force transmitted from the motor is transmitted as a force in the axial direction of the media disc in addition to the rotational force of the media disc. As a result, the media disk rotates with the hub portion of the media disk pressed against a fixed reference surface of the case of the magnetic disk cassette, and does not move up and down in the axial direction. In other words, the media disk can be rotated in a fixed plane relative to the magnetic head, and the S/
N is improved and there are no read or write errors.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a magnetic disk cassette, and a media disk 7 rotatably supported by a hub portion 5 is housed within this cassette case 3. As shown in FIG. That is, the media disk 7 is clamped and fixed by the inner peripheral portions of a pair of hub portions 5 having spiral grooves on the outer surfaces thereof, and is rotatably supported by the cassette case 3 by a shaft portion 11 in the center. A guide groove 9a and an engaging recess 3e are formed on the outside of the cassette case 3.

A slide member 13 having a protrusion 13a is slidably provided in a part of the cassette case 3, and by sliding the slide member 13, the media disk 7 is exposed through the access opening 14. It's summery.

Reference numeral 21 denotes a magnetic disk drive, and a loading chamber 25 into which the magnetic disk cassette 1 is loaded is formed within the drive case 23. Lower wall 2 forming chassis 27 in loading chamber 25
7a and the upper wall 25c are formed with a drive-side guide groove 25a for slidably guiding the cassette 1 with respect to the cassette-side guide rail 9a, and also guides the protrusion 13a of the slide member 13 to allow the cassette to slide. Guide groove 2 for opening member 13
3a is formed.

A carriage 31 is slidably supported on the chassis 27 by four ball bearings (not shown). At one end of the carriage 31, a magnetic head 41 is mounted on the protrusion 31c of the carriage 31. On the other hand, a support part 45 is formed at the other end of the carriage 31, and a needle attachment member 51 that moves integrally with the carriage 31 is supported by the support part 45 at its upper end. The other end of the needle attachment member 51 is provided with a needle 53 that traces the spiral groove of the hub portion 5 of the magnetic disk cassette 1, and is also provided with a stopper 51e that comes into contact with the protruding piece 31e of the carriage 31. The needle 5 is inserted between the carriage 31 and the needle attachment member 51.
A compression spring (not shown) is interposed at 3 to apply a spring force in the direction of the media disk 7.

In addition, a mounting portion 61 erected from one end of the carriage 31 has a pad arm 6 equipped with a pad 63 that sandwiches the media disk 7 together with the magnetic head 41.
5 is rotatably attached at both ends thereof.

A spring 70 is attached to the side of the lower surface of the chassis 27.
A rotating member 71 biased by a spring force is rotatably mounted, and the upper protrusion 7 of the rotating member 71
1a projects to the loading chamber 25 through a hole in the chassis 27, and an end 71b is formed to abut against the carriage 31.

81 is a motor provided on the lower surface of the chassis 27, and as shown in FIG. An upward spring force is applied by a leaf spring 82 attached to the holding member 85 and in contact with the protrusion 83a of the connecting portion 83A of the holding member 83. There are two protrusions 8 on the support surface 87 of the chassis 27 that comes into contact with the case of the motor 81.
7d and 87e are formed in a 180° arrangement (Fig. 3). Further, a protrusion 90a is formed at the end of the support surface 90 of the holding portion 85, and the protrusions 87d, 8
The rotating shaft 81a of the motor 81 is tilted together with 7e. The holding member 83 of the motor 81 is attached to a spring 8 attached to the drive case 23 shown in FIG.
8 is biased by a spring force, and this spring force causes the roll 89 attached to the rotating shaft 81a of the motor 81 to move against the side surface 11a of the shaft portion 11 of the magnetic disk cassette 1 when the magnetic disk cassette 1 is loaded.
The media disk 7 is rotated by the driving force of the motor 81.

Next, the operation of the above configuration will be explained.

In FIG. 2, when the magnetic disk cassette 1 is loaded into the loading chamber 25 of the magnetic disk drive 21, the following operations are performed almost simultaneously, and the information on the media disk 7 becomes readable or writable.

(1) The guide groove 2 in which the protrusion 13a of the slide member 13 of the magnetic disk set 1 is provided in the loading chamber 25
3a, the slide member 13 slides to open the access opening 14.

(2) The guide rail 25a on the inner wall of the loading chamber 25 guides the guide groove 9a of the magnetic disk cassette 1, and then the presser tongue piece 25e engages with the engagement recess 3e to position the magnetic disk cassette 1. .

(3) The end of the cassette case 3 pushes the upper protrusion 71a of the rotating member 71 of the magnetic disk drive 21, rotates the rotating member 71 counterclockwise, and applies the spring force of the spring 70 to the cartridge 31. Release it from the resting state and put it in a state where it can slide freely.

(4) The outer periphery of the media disc 7 is inserted between the magnetic head 41 and the pad 63, and the information on the media disc 7 can be read or written.

(5) The needle 53 at the tip of the needle attachment member 51 is set in the spiral groove on the outer periphery of the hub portion 5 with a spring biased toward the media disk 7.

(6) The shaft portion 11 of the magnetic disk cassette 1 presses and moves the roller 89 of the motor 81 against the spring force of the spring 88, and contacts the roller 89 with the spring force applied.

Due to this operation, the magnetic disk cassette 1
When the motor 81 is driven to rotate from the set state, the rotational force is transmitted to the rotating shaft 11 of the media disk 7 via the roller 89, causing the media disk 7 to rotate. As a result, the needle 53 traces the spiral groove, and the carriage 31 is moved toward the inner circumference of the media disk 7 via the needle attachment member 51. As a result of this movement, the magnetic head 41 on the carriage 31 moves toward the inner circumference while being in contact with the media disk 7.
Access information on media board 7. Then, the motor 81 is driven by a command from a microcomputer or the like.
A desired position on the media disk 7 can be accessed by rotating forward, reverse, or stopping.

When the magnetic disk cassette 1 is taken out after reading or writing, the rotating member 71 rotates clockwise due to the spring force of the spring 70, and the end 71b of the rotating member 71 rotates the cartridge 3.
1 is pushed in the opposite direction to the cassette removal direction and moves to the initial position. In this state, again
Wait until the magnetic disk cassette 1 is set.

By the way, as shown in FIG. 4, the rotating shaft 81a of the motor 81 is inclined so as to apply an axial force to the media disk 7. As shown in FIG. That is, the driving force F transmitted from the motor 81 is transmitted as a force F2 in the axial direction of the media disc 7, in addition to the rotational force F1 of the media disc 7. As a result, the media disk 7 rotates with the shaft portion 11 of the media disk 7 pressed against the lower surface of the case 3 of the magnetic disk cassette 1, and does not move up and down in the axial direction. That is, the media disk 7 can be rotated in a constant plane relative to the magnetic head 41, improving the S/N ratio and eliminating reading or writing errors.

[Effects of the Invention] As explained above, according to the present invention, the rotating shaft of the motor is inclined so as to apply an axial force to the media disc. Thereby, the driving force transmitted from the motor is transmitted as a force in the axial direction of the media disc in addition to the rotational force of the media disc. As a result, the media disk rotates with the hub portion of the media disk pressed against a fixed reference surface of the case of the magnetic disk cassette.
There is no vertical movement in the axial direction. In other words, the media disk can be rotated in a fixed plane relative to the magnetic head, and stable input/output signals can be obtained.
No more read or write errors.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of a magnetic disk drive according to an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of the magnetic recording device of the same embodiment, and FIG.
This figure is a bottom view showing the main parts of the magnetic disk drive of the same embodiment, FIG. 4 is an explanatory view showing the operation of the same embodiment, and FIG. 5 is a sectional view showing the main parts of the conventional magnetic disk drive. 1... Magnetic disk cassette, 3... Cassette case, 5... Hub section, 7... Media disc, 11
...Shaft portion, 21...Magnetic disk drive, 23
...Drive case, 25...Loading chamber, 31...
Carriage, 41... Magnetic head, 51... Needle mounting member, 53... Needle, 65... Pad arm, 8
1... Motor, 83... Holding member, 87, 90...
...Supporting surface, 87d, 87e, 90a...Protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] A magnetic disk cassette in which a media disk is rotatably supported in a cassette case via a hub portion having a shaft portion, and a loading device provided in a drive case for loading the magnetic disk cassette. a magnetic head that performs at least one of reading and writing on the media disk when loading the magnetic disk cassette into the loading chamber; and a motor that comes into contact with the shaft of the magnetic disk cassette to rotationally drive the media disk. What is claimed is: 1. A magnetic recording device comprising: a magnetic disk drive having: a rotating shaft of the motor is inclined so as to apply an axial force to a media disk.