JPH0442747B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention has a main body provided with a magnetic recording and/or reproducing device, and a jacket holder provided on the main body via a hinge mechanism so as to be rotatably openable and closable. A rotary magnet, in which a magnetic sheet jacket in which a magnetic sheet serving as a magnetic recording medium is rotatably housed is housed in the jacket holder, and when the holder is closed, the magnetic sheet is attached to the main body. This invention relates to a seat device.

<Background Art and its Problems> The magnetic sheet conventionally used as a recording medium in a rotating magnetic sheet device is made up of a disk having an annular recording surface formed with a center core having an insertion hole at the center of rotation. be.

The main body of the rotating magnetic sheet device is provided with a center spindle that is inserted into the insertion hole and serves as a center of rotation of the magnetic sheet, and is also provided with a rotary table for rotating the magnetic sheet. The rotary table is provided with an adsorption/fixing member such as a permanent magnet for adsorbing and fixing the center core, and by adsorbing, for example, an annular metal plate provided on the center core, the magnetic sheet is fixed to the rotating table. Therefore, the magnetic sheet rotates about the center spindle as the rotary table rotates.

By the way, the insertion hole provided in the center core is provided with a resilient member or a tapered portion so that the magnetic sheet is not eccentric with respect to the center spindle, and when inserting the center spindle, has a certain fitting friction force and slides into contact with the spindle so as to fit into the spindle. Moreover, since the magnetic sheet is attached to the main body when the cover of the jacket holder, which is rotatably provided on the main body via a hinge mechanism, is closed, the insertion hole and the center spindle fit together. When mating, the insertion hole is inserted with a slight inclination in the axial direction of the spindle, and the above-mentioned mating frictional force becomes larger. Further, the adsorption force of the adsorption/fixing member such as a permanent magnet provided on the rotary table must be of a level that does not affect signal recording or reproduction of the rotating magnetic sheet device.

Therefore, for this reason, there is a possibility that the attraction and fixation of the center core and the rotary table may be hindered by the above-mentioned fitting friction force. In other words, the center core is stopped in the middle of the center spindle due to this fitting friction force, and the center core and the rotary table come close enough to be attracted by the above-mentioned attraction force. It means that you can't do it. Therefore, the rotating magnetic sheet device may be operated while the magnetic sheet is not fully installed, resulting in recording leakage or the like.

<Purpose of the Invention> The present invention was proposed in view of the above-mentioned circumstances, and includes a method of pressing the center core of the magnetic sheet to a position where it can be attracted to the rotary table so as to approach it, and at the same time preventing the rotation of the magnetic sheet. It is an object of the present invention to provide a rotating magnetic sheet device that has a pressing member that does not cause problems and allows a magnetic sheet to be reliably mounted.

<Summary of the Invention> That is, in order to achieve the above-mentioned object, the rotating magnetic sheet device of the present invention has a center that is fitted and locked to a center core of a magnetic sheet that is rotatably housed in a magnetic sheet jacket. A rotary table having a spindle and an adsorption/fixing member disposed relative to the core; a main body including the rotary table and a magnetic head that slides into contact with the magnetic sheet for recording and reproducing; and the main body. a sheet jacket holder which is arranged so as to be rotatably openable and closable via a hinge mechanism and for attaching and detaching the magnetic sheet jacket to and from the rotary table; The center core is protruded so as to come into contact with the center core when the lid is closed and press the core to at least a position where the attraction force of the attraction and fixing member exceeds the fitting friction force between the center spindle and the core. The present invention is characterized in that a center core pressing member is provided which is held in a state separated from the core after being suctioned and fixed by the suctioning and fixing member.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the state before a magnetic sheet jacket is inserted into a jacket holder constituting a rotating magnetic sheet device.

In FIG. 1, a jacket holder 4 into which a magnetic sheet jacket 3 can be inserted and removed is rotatably attached to a main body 2 on which a magnetic recording device 1 is placed via a hinge shaft 4a.

A disk-shaped magnetic sheet 6 is rotatably housed in a jacket housing 5 that constitutes the outer housing portion of the magnetic sheet jacket 3.
On the top, video signals such as still image information are magnetically recorded to form a plurality of annular tracks. A window 7 is formed in a part of the jacket housing 5 so that a part of the magnetic recording surface 6a of the magnetic sheet 6 is exposed to the outside. One or more (one in this embodiment) magnetic head 8 provided on the main body 2 side is inserted into the window 7 so that the above-described magnetic recording is performed on the magnetic sheet 6. It's getting old. Further, a center core 9 is provided at the center of rotation of the magnetic sheet 6 so as to face outside through a hole 9A provided in the center of the casing 5 of the magnetic sheet jacket 3. . Almost at the center of the center core 9 is an insertion hole 9 into which a center spindle 11, which is provided on the main body 2 side and serves as a rotation axis of the magnetic sheet 6, is inserted.
A is provided. In order to prevent eccentricity between the center spindle 11 and the magnetic sheet 6, the insertion hole 9a is formed, for example, in a substantially pentagonal shape as shown in the figure, and has an elastic spring 9b, so that it can be fitted with the center spindle 11. Thus, the magnetic sheet 6 can be positioned relative to the center spindle 11. Note that the center core 9 is provided with an annular metal plate 9c, which will be described later (see FIG. 3).

Further, the main body 2 is fitted with the above-described magnetic sheet 6, and also has a center spindle 11 which is the center of rotation of the sheet 6, and a center spindle 11 which is the center of rotation of the sheet 6.
The above-mentioned still image information, etc. is transmitted to a rotary table 10 which is rotatably provided around 1 and on which the center core 9 of the magnetic sheet 6 is placed, and the magnetic sheet 6 in the magnetic sheet jacket 3. A magnetic head 8 for recording, a guide plate 12 for stabilizing the contact state of the magnetic head 8 with the magnetic sheet 6, and an automatic and intermittently automatic feeding of the magnetic head 8 in the radial direction of the magnetic sheet 6. A head movement operation section 13 composed of a moving arm 15 and the like for rotating the head, and a drive motor 14 for rotationally driving the rotary table 10 and the like are provided.

As shown in FIG. 2, the magnetic head 8 is mounted on the middle part of the movable arm 15, and faces upward in FIG. 2 through a head projection window 17 formed in the guide plate 12. The magnetic sheet 6 is provided so as to come into contact with the magnetic sheet 6 mounted on the center spindle 11 through the window 7 of the magnetic sheet jacket 3.

The guide plate 12 is inserted into the window 7 of the magnetic sheet jacket 3 and serves to guide the magnetic sheet 6 in the sheet jacket 3 so that it rotates in a stable state. It is something.
This guide plate 12 is formed by integrally forming a plate-shaped horizontal part 18A and a base end block 18 formed at its base end, and the magnetic sheet 6 is attached to the upper end surface of the horizontal part 18A. A sheet guide surface 18a for guiding the sheet substantially parallel to the rotating surface is formed in the shape of a smooth surface.

Further, on the lower surface of the base end block 18 is a head slider 16 to which the magnetic head 8 is attached.
A guide surface 18b on which the upper surface slides is formed parallel to the sheet guide surface 18a. Further, the window portion 17 for protruding the magnetic head described above is formed in the center portion of the horizontal portion 18. This window part 1
Reference numeral 7 is an opening that is opened so that the magnetic head 8 can track all the recording tracks from the innermost track to the outermost track on the recording surface 6a of the magnetic sheet 6.

The magnetic head 8 has a window 17 for protruding the head.
The moving arm 15 is moved by the intermittent movement of the moving arm 15 to perform magnetic recording of all the recording tracks described above.

Further, a pair of regulating pins 20a and 20b are erected on the guide plate 12 for positioning and regulating a regulating plate 19, which will be described later, provided on the jacket holder 4 side with respect to the magnetic head 8.

Further, as shown in FIG. 3, the tip end 11a of the center spindle 11 provided approximately at the center of the main body 2 is connected to the magnetic sheet 6 when the magnetic sheet jacket 3 is installed in the magnetic recording apparatus 1. The insertion hole 9 of the center core 9 attached to the center of the
It penetrates through the inside of the magnetic sheet jacket 3 and projects above the magnetic sheet jacket 3.

Further, as shown in FIG. 3, the rotary table 10 is rotatably mounted around the center spindle 11 via a ball bearing 21. As shown in FIG. 1, this rotary table 10 is rotated by the drive motor 14 via a belt 22. The rotary table 10 has a circle serving as a suction and fixing member for suctioning the metal plate 9c provided on the center core 9 in order to fix the center core 9 of the magnetic sheet 6 to the rotary table 10. An annular permanent magnet 10a is provided. Note that a leaf spring (not shown) is interposed between the head slider 16 and the head moving arm 15 for the purpose of bringing the magnetic head 8 into elastic contact with the magnetic sheet 6. It is located.

In addition, the jacket holder 4 is shown in FIGS. 1 and 2.
As shown in the figure, it is comprised of a plate-shaped receiving frame 23 that receives the magnetic sheet jacket 3, and a case cover 24 that covers the entire magnetic sheet jacket 3 from above.

On both sides of the receiving frame 23, receiving parts 23a and 23b having a substantially U-shaped cross section are formed to receive the both sides 3a and 3b of the magnetic sheet jacket 3, and the regulating plate 1 provided on the case cover 24 is formed.
Opening 23c formed so as not to interfere with 9.
is provided.

Moreover, on one side 23b of this receiving frame 23,
An engagement groove 23d is provided, and a stopper portion 25 is formed at the tip thereof to temporarily fix the jacket holder 4 to the main body 2 in the operating position. This stopper portion 25 is adapted to engage with a locking piece 26 provided on the main body 2 side.

Further, the case cover 24 has bent portions 24a and 24b formed along both side edges thereof, and one of the bent portions 24a is inserted into the engagement groove 23d of the receiving frame 23 and engaged. An engagement pin 27 that engages with the engagement groove 23d is fixed. This engagement pin 27 is provided to prevent the case cover 24 from being opened too much with respect to the receiving frame 23, and the engagement pin 27 and the engagement groove 23d work together to prevent the case cover 24 from opening too much with respect to the receiving frame 23. , the receiving frame 23 and the case cover 24 cannot be separated.

Note that a leaf spring 28 is fixed to the inner surface of the case cover 24 with screws 28a and 28b, but this is done so that the magnetic sheet jacket 3 can be easily inserted from the case cover 24 into the receiving frame. 23 by a predetermined distance.

Further, a regulation plate 19 is disposed on the case cover 24 . This regulating plate 19 has a rectangular sheet regulating portion 19a for regulating the position of the magnetic sheet 6 from the upper surface side, as shown in FIGS. 1 and 2.
and a plate-shaped attachment portion 19b integrally formed on the upper surface of the restriction portion 19a, and is disposed at a position on the case cover 24 side facing the guide plate 12. This regulating plate 19 is attached to the case cover 24 with screws 30e and 3, as shown in FIG.
Four locking pins 30a, 30b, 30c and 3 are fixed and suspended by 0f, 30g, 30h.
0d to be movable in their axial directions.

Further, a compression spring 31 is interposed between the case cover 24 and the regulating plate 19.
One end of the compression spring 31 contacts the inner wall of the case cover 24, and the other end is housed in a recess 32 provided in the center of the upper surface of the regulating plate 19. Due to the elastic force of the compression spring 31, the regulating plate 19 is always held at each locking pin 3.
Guide plate 1 along 0a, 30b, 30c, 30d
It is elastically biased in two directions.

Furthermore, a smooth sheet regulating surface 19c as shown in FIGS. 3 and 4 is formed on the lower end surface of the sheet regulating portion 19a constituting the regulating plate 19. As shown in FIGS. This regulating surface 19c is for regulating the position of the sheet surface 6a of the magnetic sheet 6 at a predetermined distance from both the upper and lower sides with the sheet guiding surface 18a of the guide plate 12 described above. The height adjustment of the regulating plate 19 having the regulating surface 19c with respect to the guide plate 12 is performed as shown in FIGS.
Adjustment screws 29a, 29b, 29 screwed onto 9b
It is now done by c. That is, the tips of the adjusting screws 29a, 29b, 29c are connected to the center spindle 11 and the regulating pins 2.
These adjustment screws 29a, 29b,
By screwing 29c forward or backward, the regulating plate 19 can be accurately positioned and adjusted relative to the guide plate 12. In this way, the regulation plate 19 is fixed to the adjustment screws 29a, 29b,
29c is received at the bottom dead center as shown in FIG. They will be accurately positioned so that they face each other with a gap between them.

In addition, when the magnetic head 8 is brought into sliding contact with the magnetic sheet 6, a relief portion of the magnetic sheet 6 is formed at a position facing the magnetic head protrusion window 17 near the center of the sheet regulating surface 19c. A semicircular grooved portion 38 is formed so as to form a groove.
Further, the circumferential edge of the sheet regulating surface 19c is chamfered in an arc shape.

Between the sheet regulating surface 19c of the regulating plate 19 and one adjustment screw 29a, as shown in FIG. , this storage section 3
Detection coils 33a and 33b for detecting the rotational phase of the magnetic sheet 6 are arranged within the magnetic sheet 9. A coil iron core 3 hanging from a plate-shaped support member 34 is located at the center of each of the detection coils 33a, 33b.
5a and 35b are arranged. These detection coils 33a, 33b and coil cores 35a, 35b
As shown in FIG. 3, the magnetic body 36 embedded in the center core 9 of the magnetic sheet 6 rotates with the center core 9, and the coil iron cores 35a, 3
The rotational speed and phase of the magnetic sheet 6 can be detected by detecting that the magnetic sheet 6 has passed a position opposite to the magnetic sheet 5b.

Note that the other end of the support member 34 is connected to the regulation plate 19.
The upper surface of the support member 34 is provided with necessary wiring 41a, 41b, .
...One end is soldered.

Further, as shown in FIGS. 2 and 3, the mounting portion 19b extends to a position in front of the center spindle 11, and a protrusion 37 is provided near its tip in a direction facing the rotary table 10. It is hanging down. The protrusion 37 is formed so that its tip hanging down toward the rotary table 10 has the same height as each tip of the coil iron cores 35a, 35b of the detection coils 33a, 33b. Above coil iron core 3
5a, 35b and the protrusion 37 are arranged to face the center core 9 of the magnetic sheet 6 placed on the rotary table 10, as shown in FIG. As shown in FIG. 3, these coil iron cores 35a, 35b and the protrusions 37 are arranged so that when the jacket holder 4 is closed, the center core 9 of the magnetic sheet 6 connects the metal plate 9c to the permanent magnet 1.
After being fixed to the rotary table 10 by adsorption to the center core 9, for example, 0.4
They are provided so that they are spaced apart with a gap of about mm.

Further, the center core 9 is the permanent magnet 10
In the state before being attracted to the permanent magnet 10a, the protrusions 37 and the coil iron cores 35a, 35b act as center core pressing members for pressing the center core 9 and ensuring that it approaches the position where it can be attracted to the permanent magnet 10a. It is becoming.

In order to attach the magnetic sheet 6 housed in the magnetic sheet jacket 3 to this rotating magnetic sheet device, the receiving frame 2 of the jacket holder 4 is attached.
3, and the jacket holder 4 is rotated and closed with respect to the main body 2. When the jacket holder 4 is closed, as shown in FIG. It is designed to be fixed by suction.

Further, as shown in FIG. 6, the center core 9 of the magnetic sheet 6 is provided on the aforementioned regulating plate 19 when the jacket holder 4 is not completely closed, and is moved by the elastic force of the compression spring 31. It is pressed by the energized projection 37 and the coil iron cores 35a, 35b. Therefore, when the jacket holder 4 is closed, the center core 9 is pressed by the protrusion 37 and the coil iron cores 35a, 35b, and the center core 9 is pushed through the insertion hole 9a and the center spindle 11.
It is designed so that it can be reliably fitted to the spindle 11 against the frictional force therebetween. As shown in FIG. 7, the center core 9 is supported by the protrusion 37 and the coil cores 35a and 35b, and the magnetic force of the permanent magnet 10a provided on the rotary table 10 is applied to the frictional force. The center core 9 will be approached to a position where the center core 9 can be reliably attracted. In this way, the rotating table 10
The center core 9 is attracted to the metal plate 9c by the permanent magnet 10a, and as shown in FIG. It will be installed in a condition where it can be used.

Further, the regulation plate 19 is connected to each of the adjustment screws 29.
a, 29b, 29c are received by the center spindle 11 and the end surfaces of the regulating pins 20a, 20b, respectively, so that their positions are regulated at the bottom dead center. After being suctioned and fixed to the center core 9, it is separated from the center core 9. Therefore, the above-mentioned protrusion 37 and each coil iron core 35a,
35b does not interfere with the high speed rotation of the magnetic sheet 6 during recording.

In this way, in this embodiment, when the magnetic sheet 6 is attached, the center core 9 of the magnetic sheet 6 is
The protrusion 37 and coil iron cores 35a, 35 mentioned above
Since the center core 9 is fitted with the center spindle 11 and can approach the rotary table 10 while being pressed and supported by the rotary table 10, the center core 9 is reliably suctioned and fixed to the rotary table 10.
The adsorption is not hindered by the fitting friction force between the spindle 11 and the insertion hole 9a, and does not become incomplete.

In addition, the protrusion 37 and each coil iron core 35a,
The magnetic sheet 6 High-speed rotation during recording is not hindered by each of the protrusions 37 and the coil iron cores 35a, 35b. Moreover, since the positions of the protrusion 37 and the coil iron cores 35a, 35b are regulated by the center spindle 11 and the regulating pins 20a, 20b provided on the main body 2 side, for example, Even if an external force or the like is applied to the case cover 24, etc., and the case cover 24 etc. is distorted, the rotary table 10, each protrusion 37, and the coil iron cores 35a, 35b are affected by the distortion of the case cover 24 etc. This makes it possible to maintain an accurate facing state without any problems.
Therefore, even if the case cover 24 etc. is distorted and the initial manufacturing precision of the case cover 24 is lost, the protrusions 37 and the coil iron cores 35a, 35b will remain in the same position as the magnetic sheet 6. Does not interfere with rotation.

In this embodiment, the pin-shaped protrusion 37 and the coil iron cores 35a and 35b are used as a pressing member to press the center core 9, but the pressing member may have a shape such as a plate-like member or a plate-like member. It may be a hemispherical protrusion or the like, and its shape and number can be varied.

Furthermore, although the above embodiments have described a rotating magnetic sheet device equipped with a magnetic recording device, the present invention can also be applied to a rotating magnetic sheet device equipped with a reproducing function or a rotating magnetic sheet device having both magnetic recording and reproducing functions. Needless to say, you can get it.

<Effects of the Invention> As is clear from the description of the above-mentioned embodiments, according to the present invention, the attraction force of the attraction and fixing member provided on the rotary table holds the center core of the magnetic sheet so that the center core and the center spindle fit together. Since the pressing member is used to bring the center core close to a position where it can be attracted by the combined friction force, the magnetic sheet can be installed reliably, and signal leakage due to incomplete installation can be avoided. There is no risk of this happening. Further, since the pressing member is provided so as to be separated from the center core after the magnetic sheet is attached, the high-speed rotation of the magnetic sheet is not hindered by the pressing member, and the magnetic sheet It is possible to maintain smooth magnetic recording and reproduction of data.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention;
Fig. 2 is a partially omitted exploded perspective view showing the main parts of the rotating magnetic sheet device, Fig. 3 is a partially omitted vertical cross-sectional view showing the state when the magnetic sheet is attached, and Fig. 4 is the partially omitted longitudinal sectional view showing the state in which the regulating plate is attached. 5 is a partially omitted vertical sectional view, and FIG. 5 is a schematic plan view showing the positional relationship between the regulating plate and the magnetic sheet.
Fig. 6 is a partially omitted longitudinal cross-sectional view showing the state in which the jacket holder is being closed, and Fig. 7 shows the state before the jacket holder is closed and the magnetic sheet is adsorbed and fixed to the rotary table. It is a partially omitted vertical cross-sectional view. 2...Main body, 3...Magnetic sheet jacket, 4
...Jacket holder, 6...Magnetic sheet, 8...
... Magnetic head, 9 ... Center core, 9a ... Insertion hole, 9c ... Metal plate, 10 ... Rotating table, 10a
... Permanent magnet, 11 ... Center spindle, 1
2... Information board, 19... Regulation board, 20a, 20b
...Regulation pin, 23 ... Receiving frame, 24 ... Case cover, 29a, 29b, 29c ... Adjustment screw, 3
0a, 30b, 30c, 30d...Lock pin, 3
1... Compression spring, 33a, 33b... Detection coil, 35a, 35b... Coil iron core, 37...
…protrusion.

Claims (1)

[Scope of Claims] 1. An attraction and fixing member having a center spindle that is fitted and locked to a center core of a magnetic sheet that is rotatably housed in a magnetic sheet jacket, and that is disposed relative to the core. a main body including the rotating table and a magnetic head that records and reproduces data in sliding contact with the magnetic sheet; and a jacket holder for attaching and detaching the magnetic sheet jacket to and from the rotary table, the magnetic sheet jacket is resiliently supported by the jacket holder, and comes into contact with the center core when the holder is closed, thereby fixing the core by at least the suction. The member is provided in a protruding manner so that it can be pressed to a position where the attraction force of the member exceeds the fitting frictional force between the center spindle and the core, and is held in a state separated from the core after the attraction and fixation member has secured the member by attraction. A rotating magnetic sheet device characterized by being provided with a center core pressing member. 2. The rotating magnetic sheet device according to claim 1, wherein the center core pressing member is a coil iron core of a detection coil for detecting the phase of the magnetic sheet.