JPS634262B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating magnetic sheet recording and/or reproducing apparatus in which a magnetic head inserted from outside the jacket is brought into stable sliding contact with a magnetic sheet rotating within the jacket.

When a thin disc-shaped magnetic sheet is rotated at high speed and a magnetic head is brought into sliding contact with the sheet to perform recording/reproduction on the recording track of the magnetic sheet, stable sliding contact between the sheet and the magnetic head is achieved. Otherwise, highly reliable recording and reproduction will not be possible. Since such a magnetic sheet is formed into an extremely thin sheet of, for example, about 40 microns, there is a risk that the sheet will be easily damaged or soiled if left uncovered. Therefore, this type of seat is usually formed so as to be stored inside a cover body A such as a protective jacket or case, as shown in Fig. The magnetic sheet C can be exposed to the outside only in the window portion B of the magnetic sheet. Therefore, during recording and reproduction, the sheet C, together with the cover body A, is attached to a recording and reproducing device (not shown), and while only the sheet C is rotated at high speed by a rotating mechanism, it is brought into sliding contact with the magnetic head at the window B for tracking. That's what I do. In this case, the size of the conventional magnetic sheet C of this type is relatively large. Therefore, when this sheet C is rotated at high speed within the cover body A, as shown in _{FIG .} The sheet C is maintained in a sufficiently tensioned state because an air film layer is formed by the air flow as illustrated by the arrow inside, or because of centrifugal force when the sheet C itself rotates. Therefore, under such conditions, even if the magnetic head D is slid into contact with the sheet C from one side in the uniaxial direction as shown in _FIG . Due to the force, the sheet C is moved to the magnetic head D.
A stable sliding state of the head can be easily obtained without the head escaping in the direction away from the head.

As mentioned above, it does not matter if the magnetic sheet C is formed into a relatively large sheet body, but if the sheet shape is formed into a small diameter, the centrifugal force and air layer of the sheet C itself are effective within the cover body A. If you try to bring the magnetic head D into sliding contact with the magnetic sheet C from one side, the magnetic sheet C will slide against the head D.
It escapes to the other side opposite to its position, making it impossible to obtain a stable sliding contact state.

In order to perform highly reliable recording and playback,
The reality is that the accuracy of the contact between the magnetic sheet C and the magnetic head D is required to be extremely precise, for example, in units of 20 microns.

By the way, especially today, there is a strong demand for miniaturization of this type of sheet C, and if the entire cover body A is formed so small that it can be easily placed on the palm of the hand, for example, about 5 cm on one side, it is difficult to The size of the sheet C within the cover body A is extremely small, with a radius of only about 2 cm, and the above-mentioned disadvantage becomes even more remarkable. Therefore, in order to solve this inconvenience, theoretically, the dimensional accuracy between the upper and lower walls _{A 1} and _{A 2 of} the cover body A should be set strictly, and the magnetic sheet Although it is possible to strictly set the positioning of C, it is difficult to avoid variations in the dimensions of the jacket, which is the cover body A, during manufacture, and this is not practical. In addition, if we temporarily avoid the above-mentioned jacket variations,
If the dimensional accuracy is to be improved, there is a disadvantage that the jacket, which is the cover A part, requires more effort and cost to manufacture than the magnetic sheet C, which is the main part.

The present invention was proposed in view of the above-mentioned conventional circumstances, and is particularly applicable to a rotary magnetic recording/reproducing device sheet recording and/or reproducing device that uses a miniaturized magnetic sheet device as a recording medium. The aim is to easily achieve an extremely reliable contact state between the magnetic sheet and the magnetic head, and it is possible to easily stabilize the magnetic sheet and the magnetic head with a simple configuration without complicating the structure of the magnetic sheet device or increasing costs. The purpose of this is to realize a sliding contact.

Furthermore, in order to achieve the above object, the present invention can achieve this by simply applying it to the periphery of the head on the recording/reproducing device side, without adding or improving any special structure to the magnetic sheet device itself. The purpose is to

That is, the present invention provides a sheet rotating table that engages with a rotating shaft insertion portion exposed at the center of a jacket of a rotating magnetic sheet device and rotationally drives a magnetic sheet housed in the jacket, and a seat rotary table that engages with a rotating shaft insertion portion exposed at the center of a jacket of a rotating magnetic sheet device, and a seat rotary table that rotates a magnetic sheet housed in the jacket; A magnetic head device is inserted through the formed head sliding contact window and is provided so as to be movable in the radial direction of the magnetic sheet while being in sliding contact with the lower surface of the magnetic sheet, and a head sliding contact formed on the upper surface of the jacket. a wide sheet regulating plate inserted through the window and positioned close to the upper surface of the magnetic sheet, and covering the moving range of the magnetic head device; By facing the magnetic head device, the sliding contact between the magnetic head device and the magnetic sheet is stabilized.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

First, an example of a rotating magnetic sheet device used in the apparatus of the present invention will be explained with reference to FIGS. 2 to 7.

This rotating magnetic sheet device 1 has a small overall external dimension that can be easily held in the palm of the hand, and a disk-shaped magnetic sheet 3 housed in a jacket 2 has a large number of magnetic recording tracks on its circumference. It is formed in such a manner that it is possible to record and reproduce one still image on one track, and is suitable for use in which the same number of still images as the number of tracks are recorded. The surface of the magnetic sheet 3 is exposed to the outside only at the head sliding contact window 2A of the jacket 2. As shown in FIGS. 4 and 5, the magnetic sheet 3 is, for example, 40
It is formed into an ultra-thin disk shape of about micron size, and a rotating shaft insertion portion 4 is integrally attached to the center portion. This insertion part 4 is formed by integrally assembling a pair of upper and lower center bosses 5 and 6 made of synthetic resin, and forming a periphery of the center hole 3A of the sheet 3 between the center flange parts 5A and 6A of each boss 5 and 6. Metal rings 5D and 6D are arranged on the tip surfaces 5C and 6C of both end shaft parts, and are adapted to be attracted to a magnet 27C of a sheet rotating table 27, which will be described later. The magnetic sheet 3 can perform magnetic recording from the inner track _T1 to the outer track _T0 .

Further, the jacket 2 which rotatably holds the magnetic sheet 3 is attached to the bottom plate 2 as shown in FIG.
It is constructed by laminating and bonding B, the middle plate 2C, and the top plate 2D.

That is, each of the plates 2B, 2C, and 2D is formed of a material such as a thin plate-like synthetic resin material so that the outer dimensions thereof are approximately the same. In the center of the bottom plate 2B, a stepped portion 7 is provided in the middle in the axial direction.
A stepped hole 7 having a shape A is formed, and a notched recess 9 is formed near the center of one side edge 8, and positioning holes 22 and 23 for the jacket 2 are formed on both sides of this notched recess 9. A small circular hole 11 is bored in the elongated hole 10.

Further, the middle plate 2C is interposed and laminated between the bottom plate 2B and the top plate 2D to hold and form a sheet accommodation gap 12 within the jacket 2, and therefore is sufficiently thicker than the thickness of the magnetic sheet 3. A large circular hole 13, which is slightly larger than the outer dimensions of the magnetic sheet 3, is provided in the central portion. In addition, the bottom plate 2B is located near the center of one side edge 14 of the middle plate 2C.
A protective arm portion 15 is formed to protect the outer peripheral edge of the magnetic sheet 3 exposed within the head sliding contact window 2A formed by the notch recess 9 of the head and the notch recess 21 of the surface plate 2D to be described later. Circular holes 16 and 17, which together with the long hole 10 and small circular hole 11 of the bottom plate 2B constitute the positioning holes 22 and 23 of the jacket 2, are bored near each corner near the side edge 14, respectively. .

Next, the top plate 2D has a stepped hole 19 having a step 19A halfway in the axial direction, and a stepped hole 19 is formed in the center of the side edge 20 so that the front and back sides are symmetrical with the bottom plate 2B. A notch recess 21 is formed, and in the vicinity of each corner near the one side edge 20, there are elongated holes 10, a circular hole 16, a small circular hole 11, and a circular hole 17 in the bottom plate 2B and the middle plate 2C. Small circular holes 2 forming the positioning holes 22 and 23 of the jacket 2
2 and a long hole 23 are bored.

Then, the jacket 2 is formed by superimposing the middle plate 2C on the bottom plate 2B and the top plate 2D above the bottom plate 2B and joining them together. Incidentally, a magnetic sheet 3 is placed inside the gap 12 in the jacket 2. Then, the center flanges 5A, 6A of the rotating shaft insertion part 4 of the magnetic sheet 3 are inserted into the enlarged diameter holes 7B, 19B formed between the enlarged diameter parts of the respective stepped holes 7, 19, and the shafts at both ends thereof are further inserted. Part 5B, 6
The magnetic sheets 3 are loosely fitted and held so that they fit into the small diameter portions 7C, 19C of the stepped holes 7, 19, and the magnetic sheets 3 are opened by the notch recesses 9, 21 of the bottom plate 2B and the top plate 2C. The head sliding contact window 2A is internally exposed so that it can come into sliding contact with the magnetic head.

Next, an example of a magnetic recording apparatus B to which the present invention is applied, in which the rotating magnetic sheet apparatus 1 is mounted to perform magnetic recording, will be explained with reference to the figures shown in FIG. 8 and subsequent figures.

The outline of this device is, for example, as shown in FIG.
, a magnetic head 28 , a head movement operation unit 29 , a motor 30 , etc., and when recording, the rotating magnetic sheet device 1 is attached and the case cover 26 is closed, so that the magnetic sheet disposed on the case substrate 25 can be moved. A lower guide plate 31 as a guide plate and an upper guide plate 3 as a regulation plate disposed on the case cover 26 side.
2, it is possible to stabilize the contact of the magnetic sheet 3 against the magnetic head 28 and perform highly reliable recording and reproducing.In particular, this device is formed in a small size that can be held in the palm of the hand, and the head movement operation is easy. By moving the magnetic head 28 one track at a time in the radial direction of the magnetic sheet 3 using a ratchet wheel 33 disposed at the operating end of the magnetic sheet 3, one staple image can be recorded on one track of the magnetic sheet 3. It is configured.

That is, in this example, the case substrate 25 has left and right side walls 25B, 25C rising and bent on both sides of a plate-shaped main body 25A.

In addition, bearing portions 3 for attaching the case cover are provided near one end of each of the left and right side wall portions 25B and 25C.
4A and 34B are formed.

Note that the case cover 26 has a plate-shaped main body 26.
Right and left side walls 26B, 26C are bent at both ends of A, and the case board 2 is formed at the bearing portions 34A, 34B at portions near one end of each of these side walls 26B, 26C.
It is pivoted to 5. That is, the case board 25
and the case cover 26 are connected to the bearing portions 34A, 34B.
It is rotatably supported by a pivot shaft 35 at.

Further, the sheet rotating table 27 magnetically attracts the disk-shaped magnetic sheet 3 of the magnetic sheet device 1 and rotates the disk-shaped magnetic sheet 3 in an integrated manner.

That is, as shown in FIG. 9, for example, this sheet rotating table 27 has a rotating shaft 27A fitted and locked in the rotating shaft fitting part 4 of the magnetic sheet 3 at the center of the upper end, and this rotating shaft base. Edge peripheral step 27
An annular magnet 27C is disposed at B so as to be able to attract and support the metal ring 5D or 6D of the insertion portion 4. Furthermore, a belt pulley 27D is formed in the middle of the rotary table 27, around which a transmission belt 30A, which is passed around by the drive motor 30, is wound. Bearings 35A, 3
5B is interposed and rotatably supported.

Further, the tip of the rotating shaft 27A passes through the insertion section 4 and protrudes above the magnetic sheet device 1 when the magnetic sheet device 1 is attached, and makes contact with the tip of the upper guide mounting plate, which will be described later. becomes. Therefore,
A sliding means such as, for example, a sphere 27F is arranged at this tip.

Then, the magnetic sheet 3 of the magnetic sheet device 1
The installation height position is determined by the position of the stepped portion 27B of the seat rotating table 27.

Next, the magnetic head 28 is moved as shown in FIGS.
It is formed as shown in Figure 1. Note that although the illustrated example is a three-head system, the invention is not limited to this.

That is, the head tip 38 of the magnetic head 28 is attached to a head tip support portion 36A formed upright from one end of a head slider 36 formed in a U-shape. Further, the slider 36 has contact sliding portions 36 on both end edges thereof with the upper and lower guide plates 31.
B and 36C are formed, and are further supported by a tip plate spring 37 of the head moving operation section 29 on the lower surface 36D, and are biased so that the respective sliding sections 36B and 36C are pressed against the lower guide plate 31. .

The lower guide plate 31 constitutes a magnetic sheet guide plate, and as shown in FIGS. 11 to 14, it has an L-shaped vertical portion 31A and a horizontal portion at the upper end of the base end block 31B. 31C is integrally formed, and a head protruding window 31D is formed vertically through the center of this horizontal portion 31C. This window 31D shows that the magnetic head 28 is connected to the magnetic sheet 3.
The head tip 38 is opened to protrude so that it can track all the tracks from the innermost track _T1 to the outermost track _T0 . Further, the horizontal portion 31C serves to regulate the area around the head of the magnetic sheet 3 from the bottom side of the sheet, and therefore the surface becomes a sheet guide surface 31E formed in a smooth surface shape, and the side edges The portions 31F and 31G are processed into arc shapes as shown in FIG. Further, on the lower surface side of the horizontal portion 31C, each sliding portion 36B, 36C of the head slider 36 is provided as shown in FIG.
Guide surfaces 31H and 31I that slide relative to each other are formed. These guide surfaces 31H and 31I are parallel to the sheet guide surface 31E.

In addition, the base end block 31B of the lower guide plate 31
A pair of positioning pins 31J and 31K are provided on the top side of the
has been planted. These pins 31J, 31K determine the position of a sheet regulating surface 32A of the upper guide plate 32, which will be described later, and faces a sheet guiding surface 31E of the lower guide plate 31.

Further, the upper guide plate 31 is disposed to face the lower guide plate 31 and constitutes a sheet regulating plate that prevents the magnetic sheet 3 from floating up from the magnetic head 28 and stabilizes the state of sliding contact with the magnetic head 28. A guide plate 32 is supported on the inner surface of the case cover 26. The lower guide plate 31 is formed wide enough to regulate the magnetic sheet 3 at a portion of the magnetic sheet 3 that comes into sliding contact with the magnetic head 28 and on both sides of this sliding portion. It is formed to be large enough to at least cover the range of movement of.

In this embodiment, the upper guide plate 32
are locking pins 41A, 41B, 41C, and 41D that are planted and hang down on the main body 26A of the case cover 26.
The upper guide mounting plate 40 is mounted on the lower surface of the upper guide mounting plate 40, which is supported so as to be vertically movable. Also,
A tip 42B of a leaf spring 42 having a base 42A fixed to the case cover 26 is pressed against the upper guide plate 32 and is biased downward, ie, in the direction of the lower guide plate 31, along each of the pins 41A to 41D. Further, the mounting plate 40 has a distal end 40A that protrudes beyond the upper guide plate 32, and an upper end 27 of the rotating shaft 27A.
F is adapted to abut and engage.

Further, on the lower side of the upper guide plate 32, that is, near the center of the sheet regulating surface 32A, a semicircular grooved strip 32B is provided for the magnetic head so as to form a relief section when facing the head protrusion 31D. 28
It is formed over the movement range of. The regulating surface 32A of the upper guide plate 32 also has a smooth surface shape, and both end edges 32C and 32D thereof are arcuate.

A small gap is maintained between the upper and lower guide plates 32 and 31 on both sides of the magnetic sheet 3 when the plates 32 and 31 are positionally adjusted from both the upper and lower sides so as to sandwich the magnetic sheet 3. However, the positional relationship between each guide plate 32 and 31 is such that the upper guide plate 32 engages and abuts the positioning pins 31J, 31K that are set up from the lower guide plate 31. The rotating shaft 27A
By engaging and abutting the lower guide mounting plate 40 with the sphere 27F at the tip of the lower guide plate 40, the distance between the positions of the upper guide plate 32 is adjusted based on the position of the lower guide plate 31.

Next, the head movement operation unit 29 moves the magnetic head 2
8 in the radial direction of the magnetic sheet 3 to move the recording track on the sheet 3 from the innermost track _T1 to the outermost track T0 _.
This is a member for tracking scanning over the entire distance.

In the illustrated example, an L-shaped head moving arm 43 whose midway portion 43B is rotatably supported by a pivot shaft 44 mounted on the case board 25
The head slider 36 is attached to the tip 43A of the head slider 36 via the leaf spring 37. Also,
The base end 43C of the movable arm 43 is abutted and engaged with an engagement shaft 47 mounted on a ratchet 46 that is rotatable around a ratchet shaft 45. The ratchet oil 33 is meshed with a pinion 48 that is integrated with the ratchet wheel 33.
The engaging shaft 47 is rotated around the ratchet shaft 45 by rotating the engaging shaft 47.
5 and move the moving arm 43 around the pivot shaft 44.
It is designed so that it can be rotated around. Therefore, the ratchet wheel 33 has, for example, an outer peripheral edge protruding outward from the case so that it can be rotated easily from the outside of the case. In addition,
49 in FIG. 16 for the head moving arm 43;
This is a tension spring for pulling back the pivot shaft 44 in a clockwise direction.

Further, 50A and 50B are jacket positioning pins installed on the case substrate 25, and are engaged with the positioning holes 2B and 2C of the jacket of the magnetic sheet device 1.

Therefore, in order to attach the magnetic sheet device 1 to the recording device having the above configuration, open the case cover 26, match the positioning holes 22 and 23 of the jacket 2 to the positioning pins 50A and 50B, and insert the rotary shaft insertion portion 4.
The rotating shaft 27A of the seat rotating table 27 is inserted into the seat.
In this state, the magnetic sheet portion exposed within the head sliding contact window 2A of the jacket 2 is fitted onto the sheet guide surface 31E of the lower guide plate 31. When the case cover 26 is closed to cover the magnetic sheet device 1 loaded in this way, the upper guide plate 32
faces the head sliding contact window 2A of the jacket 2 from above, and the sheet regulating surface 32A contacts the magnetic sheet portion within the window 2A. At this time, the upper guide plate 3
2 abuts and engages with the positioning pins 31J and 31K that are set up from the lower guide plate 31 side, so that the upper guide plate 32 is positioned accurately at the facing interval position set with the lower guide plate 31 side as a reference. will be supported by Further, when the magnetic head 28 is in sliding contact with the magnetic sheet 3, the area around the sliding contact portion of the head is held between the sheet guiding surface 31E and the sheet regulating surface 32A of the upper and lower guide plates 31 and 32 from above and below. Since the magnetic head 28 is positioned so as to be in sliding contact with the magnetic sheet 3, the magnetic head 28 can always be in a stable state of sliding contact with the magnetic sheet 3.

As described above, in the present invention, the positional regulation of the magnetic sheet is performed between the sheet regulating surface and the sheet guiding surface, which face each other, independently of the jacket, and the installation interval of each of these surfaces is determined by the height of the positioning pin. Since a desired spacing can be easily set by selecting the spacing, the sliding state of the magnetic sheet with respect to the magnetic head is stabilized, and good recording and reproducing characteristics can be guaranteed.

In particular, the present invention provides for controlling the magnetic sheet with a sheet regulating plate that is disposed without moving together with the magnetic head, covers the magnetic sheet over the range of movement of the head, and widely covers both sides of the sliding portion of the magnetic head. Because of this, it is possible to maintain stable sliding contact between the magnetic sheet and the magnetic head without applying a large load to the magnetic sheet in a small device that rotates the magnetic sheet at high speed.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a conventional magnetic sheet, in which A is a perspective view of the appearance of the back side, B is an enlarged cross-sectional view with a portion cut away, and C is a diagram showing the state of sliding contact with a magnetic head. FIG. Fig. 2 is an external perspective view showing an example of a magnetic sheet device applied to the device of the present invention, Fig. 3 is a plan view, Fig. 4 is a perspective view of the magnetic sheet portion, and Fig. 5 is a sectional view. FIG. 6 is an exploded perspective view of the jacket, and FIG. 7 is a sectional view of the magnetic sheet device. FIG. 8 is a schematic external perspective view of a recording apparatus to which the present invention is applied, FIG. 9 is an enlarged sectional view of the sheet rotating table, FIG. 10 is an enlarged perspective view of the magnetic head, and FIG. FIG. 12 is an enlarged front view showing the guide plate portion, and FIG. 12 shows the lower guide plate, A is a left external perspective view, B is a right external perspective view, and C is a front view. FIG. 13 is an enlarged perspective view showing the relative relationship between the upper and lower guide plates, and FIG. 14 is an enlarged view showing the position regulation state of the magnetic sheet.
B is a vertical front view, and B is a vertical side view. FIG. 15A is a perspective view of the upper guide plate seen from below, and FIG. 15B is a cross-sectional view of the upper guide plate. FIG. 16 is a schematic plan view for explaining the head movement operation section. 1... Magnetic sheet device, 2... Jacket, 3
...Magnetic sheet, 28...Magnetic head, 31...
Lower guide plate serving as a guide plate; 31J, 31K: positioning pin; 32: upper guide plate serving as a regulating plate;

Claims (1)

[Scope of Claims] 1. A sheet rotating table that engages with a rotating shaft insertion portion exposed at the center of a jacket of a rotating magnetic sheet device and rotationally drives a magnetic sheet housed in the jacket; and a lower surface of the jacket. a magnetic head device inserted through a head sliding contact window formed in the jacket and movable in the radial direction of the magnetic sheet while slidingly in contact with the lower surface of the magnetic sheet; and a head sliding window formed in the upper surface of the jacket. a wide sheet regulating plate inserted through a window and positioned close to the upper surface of the magnetic sheet, and covering a movement range of the magnetic head device, the sheet regulating plate being inserted across the magnetic sheet; A rotating magnetic sheet recording and/or reproducing device which stabilizes the sliding contact between the magnetic head device and the magnetic sheet by arranging the magnetic sheet to face the magnetic head device. 2. The seat regulating plate is attached via a spring to a support configured to be close to and away from the seat rotating table fixed to the chassis, and abuts against positioning pins set up with the chassis as a reference. The rotating magnetic sheet recording and/or reproducing apparatus according to claim 1, wherein the rotating magnetic sheet recording and/or reproducing apparatus is configured to be positioned in the height direction by being supported by the rotating magnetic sheet.