JPH01173369A - Method for erasing information recording disk - Google Patents

Abstract

PURPOSE:To prevent information from being left for erasing at a re-recording time by positioning an engaging part to a transiting part between a second small groove part and a third small groove part corresponding to a position for fine adjustment and erasing a track position to correspond to the transiting part. CONSTITUTION:In a spiral shaped groove 22b in the shaft outer peripheral part of a screw shaft 22, first small groove parts A0, A8, A16...A8n (n: integer number) corresponding to the normal track position of an information recording position, second small groove parts A2, A6, A10...A(8n+2) (n: integer number) corresponding to the position for fine adjustment and third small groove parts A4, A12, A20...A(8n+4) (n: integer number) corresponding to the central part of the adjacent normal track position are continuously formed. Then, at a recording time, a connector executes a recording with being always positioned in the first small groove part A8n. At a reproducing time, for example, when a reproducing output is maximum in the second small channel part A2, the connector is positioned in a transiting part S between the second small groove part A2 and the adjacent third small groove part A4 and the erasing is executed. Then, picture information, which are recorded in an outer side than a recording track position to correspond to the second small groove part A2, are also erased.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information erasing method employed in a disk drive device that records and/or reproduces information on an information recording medium formed in a disk shape. In particular, the present invention relates to an erase method suitable for a still video floppy disk drive used for recording and/or reproducing still image information.

[Conventional technology]

In a disk drive device that records and/or reproduces information on an information recording medium, it is necessary to move, for example, a magnetic head in the radial direction of the recording medium for writing and/or reading signals. A transfer device for transferring this magnetic head requires a motor as a driving source and a transmission mechanism for transmitting the driving force of the motor to a carriage that supports the magnetic head.

An example of a disk drive device equipped with such a transfer device is proposed by the present applicant in Japanese Patent Laid-Open No. 62-212978. The disk drive device shown as an embodiment of this application is a so-called still video floppy device for recording/reproducing still images, and its outline will be explained with reference to FIGS. 4 to 7.

The disk drive device shown in the figure includes a frame 1 and a frame 1.
A slide plate 2 that can be slid in the vertical direction in FIG. 4 on the top surface of the
Side plate 2a of slide plate 2 adjacent to side plate 3.4 of frame body 1
, 2b are provided with protrusions 5a and 6b on their side surfaces that engage with cam guides formed in the holder 7, which holds a disk cartridge, and which is attached to the upper surface of the frame 1 and drives the turntable 8 to rotate. A motor 9 that together with 8 constitutes a disk drive mechanism; a carriage 10 that is located on the upper surface of the frame 1 and is moved in the radial direction of the disk (not shown); a carriage transfer mechanism 12 that moves the carriage 10 by a stepping motor 11; It mainly consists of a lock lever 14 that can regulate the sliding position of the slide plate 2.

The carriage transport mechanism 12 used in this disk drive is unitized into a carriage transport unit 20.
It consists of This carriage transfer unit 20 is
As shown in the exploded perspective view of FIG. 6 and the cross-sectional view of main parts of FIG. The support plate 21 is bent into two stages as shown in FIG. 24. Bearing 2 supported by 25
The screw shaft 22 is supported between G and 27. The screw shaft 22 and the stepping motor 11 are integrally attached to the support plate 21 to form one unit.

Intermittent drive screw 28 carved into screw shaft 22
is similar to that disclosed in Japanese Utility Model Application Publication No. 60-67564 filed by the present applicant, and is shown in Figures 8 to 1.
As shown in Fig. 0, a perpendicular line Y perpendicular to the axis
parallel to, that is, the leading angle is zero (-〇t),
A groove portion 22a having a straight bottom portion is formed on the shaft 22.
As a result, these grooves 22a form one spiral 122b.
is formed. A feeding portion 22c for moving the carriage 10 at a predetermined pitch is formed at each connection portion (transition portion) between adjacent grooves 22a.

In the carriage transfer unit 20 configured by fitting the engager 29 of the carriage 10 into the spiral groove (intermittent drive screw) 22b of the screw shaft 22,
As the screw shaft 22 rotates, the carriage 10 moves in a predetermined direction in accordance with the advance angle θ1 when the engager 29 slides within the feeding portion 22c of the spiral groove 22b.
Further, when the engaging element 29 reaches a desired groove portion 22a of the spiral groove 22b, the power supply to the stepping motor 11 is cut off and the movement of the carriage 10 is stopped. In this way, the feeder 22c moves the target groove 2.
By stopping the movement at 2a, the carriage 10 is moved intermittently. In the groove portion 22a, the advance angle θ2
is zero, so even if the rotation angle of the screw shaft 22 is slightly deviated, the stop position of the carriage 10 is set appropriately, and the stop position accuracy is increased.

Bearings 26.2 supporting both ends of the screw shaft 22
7 rotatably supports the end of the conical screw shaft 22 with a pot bearing, and on the bearing 26 side, the screw shaft 22 is biased rightward in FIG. 7 by a compression spring 30. On the bearing 27 side, the axial position can be adjusted using an adjusting screw 31. Further, on the bearing 27 side, the bearing 27 is supported by the side wall 25 as described above, and the adjustment screw 3
1 is embedded in the bearing 27 from the side wall 25, and the protruding portion 32 is inserted into the support hole 33 of the side plate 4 of the frame 1.
The height position of the carriage transfer unit 20 itself is defined by being fitted into the carriage transfer unit 20 itself.

The spur gear 34 fitted to the screw shaft 22 meshes with the crown gear 36 fitted to the rotating shaft 35 of the stepping motor 11 attached to the support plate 21, and the step operation of the stepping motor 11 is controlled by the crown gear 36.
6. Transmitted to the screw shaft 22 via the spur gear 35. Thereby, the rotational operation of the stepping motor 11 is transmitted to the carriage 10 via the intermittent drive screw 28, and the carriage 10 is caused to move straight at each step.

By the way, in the above-mentioned disk drive device,
The track spacing of a magnetic disk (in this case, a still video floppy disk) (not shown) is 100 μm,
Off-track amount on the disk drive side is maximum ±14μm
stipulated in

This is done in consideration of the compatibility of the disc with the player, and as long as the off-track amount falls within this range, there is no problem with normal playback.

However, if the playback device finely adjusts the head position according to this amount of off-track, the image quality will be significantly improved.

In the above disk drive device, fine adjustment of the position of the magnetic head 37 is performed using an adjustment screw 31.
If you make fine adjustments to the optimal position during playback and then record in that state, it will be recorded in an off-track state during playback. Then, when playing back on another disk drive, it is necessary to fine-tune the head position of that playback device again by the off-track amount, and this time, recording is performed using the disk drive that played back, This fine adjustment is also required when reproducing the data. If the fine adjustments are accumulated in this way, the off-track amount will also accumulate, and the off-track amount will no longer fall within the range of ±14 μm, which may impair the compatibility of the disc.

In order to avoid this, it is necessary to always maintain the normal track position during recording and to perform the above fine adjustment only during playback, especially when playing back a disc recorded with another disc drive. That is, during recording, it is necessary to apply servo so that the recording position always returns to the preset recording position regardless of fine adjustments during playback, and maintains the optimal position during playback.

This servo is performed by moving the carriage 10 itself in the thrust direction via the screw shaft 22, but if such a servo a mechanism is introduced, the disk drive device will become complicated and miniaturization will be hindered. , there is a problem of high cost.

Therefore, in Japanese Patent Application No. 61-128222, the present applicant provided a plurality of grooves along the circumferential direction on the outer circumference of the shaft, each having an extremely small advance angle and a substantially linear groove bottom, and A carriage having a screw shaft in which one helical groove is formed by sequentially shifting grooves in the axial direction, a stepping motor for rotationally driving the screw shaft, and an engaging means for engaging the helical groove. The stepping motor is rotated by a predetermined step to change the groove engaged by the engaging means by the number of steps, and the carriage is moved in the axial direction of the screw shaft by an amount of deviation corresponding to the number of steps of the groove. In a disk drive device equipped with a carriage transfer device for transferring,
We have proposed a disk drive device in which each of the grooves is divided into three parts, and the small grooves at both ends adjacent to the other grooves are shifted in the axial direction by a preset dimension with respect to the small groove in the center, and in the direction of the adjacent grooves. .

According to this disk drive device, if the amount of deviation of the small grooves at both ends is set, for example, to the prescribed maximum off-track amount, and the number of steps of each small groove and the stepping motor is made to correspond to 1:l, the stepping motor Off-track can be minimized simply by controlling the rotation angle. In other words, if the stepping motor is set so that it moves one step to the next small groove, the specified amount of off-track can be achieved just by moving the stepping motor one step forward or backward from the small groove in the center of off-track ■0 in the disk drive device. The optimum head position can be selected by simply selecting the detection position of the maximum signal level from the head device for the three small grooves.

[Problem that the invention seeks to solve]

In this way, in the above-mentioned conventional technology, sufficient consideration is given to compatibility during playback, but when re-recording is performed, the image information before being re-recorded may deviate from the normal track position. In this case, the image information of the portion outside the gap width still remains. Therefore, when a disk with erased remains is played back, depending on the relative positional relationship between the magnetic head and the recording track, noise may be added to the reproduced information, reducing the S/N and causing ghosts. cause
It becomes impossible to reproduce highly accurate images.

This is a problem that arises because the magnetic head used for recording image information as described above is not of the advance erase type, but of a type that performs recording and reproduction using the same gap.

This invention has been made in view of the actual state of the prior art, and its purpose is to provide a disk drive device that can always reproduce highly accurate images without leaving image information on the disk when re-recording is performed. The purpose is to propose an erase method.

[Means for solving problems]

In order to achieve the above object, the erasing method according to the present invention includes: a first small groove portion corresponding to a regular track position of an information recording disk;
A second small groove corresponding to the fine adjustment track position and a third small groove connected to one side of the second small groove and corresponding to the center of the adjacent regular track position are separated by an advancing angle. A screw shaft in which a single spiral groove is formed by sequentially displacing small grooves in the axial direction and circumferential direction of an off-axis shoulder part as small grooves having a zero and straight groove bottom, and a stepping mechanism that rotationally drives this screw shaft. A disk drive device comprising a motor and a carriage transport device including a carriage having an engaging means that engages with the spiral groove, the disk drive device comprising: a second motor;
The engaging means is positioned at the transition portion between the small groove portion and the third small groove portion, and the track position corresponding to the transition portion is erased.

[For production]

According to the above means, when fine tracking is performed at the recording track position corresponding to the second small groove part which is the position for fine adjustment, the corresponding second small groove part and the third small groove part adjacent thereto are fine tracked.
Erasing can be performed approximately at the center of the transition between the small groove and the small groove. This makes it possible to erase image information recorded further outside the recording track position corresponding to the second small groove portion, and it is possible to prevent information from remaining erased.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one Example of this invention is shown in the drawing, and is demonstrated based on the said drawing.

1 to 3 are for explaining a spiral groove of a screw shaft used in a disk drive device according to an embodiment of the present invention, and FIG. 1 is a front view of the spiral groove;
FIG. 2 is a plan view of the same, and FIG. 3 is an explanatory diagram of the advance angle of the spiral groove. In the following description, components that are the same as or can be considered to be the same as those of the conventional example are given the same reference numerals, and descriptions of overlapping parts are omitted as appropriate.

In FIGS. 1 and 2, the screw shaft 22
A groove portion 22a, which is parallel to the perpendicular Y perpendicular to the axis X, that is, has a lead angle of zero, and whose bottom portion is straight, is provided on the outer circumferential portion of the shaft 34 in a state in which the groove portion 22a is sequentially shifted in the axial direction of the shaft 34. A large number of grooves 22a are arranged in series, and these grooves 22a form one spiral groove 22b, similar to the conventional example.

In this embodiment, this spiral groove 22b is the first small groove part An, All corresponding to one regular rack position.

80, ......A, n (n: integer) and second small groove portions Az, A6, A corresponding to the fine adjustment positions
+o, ・・・・・・・・・A(a n + 2)
(n: integer) and a third small groove portion A4° AIz, Az corresponding to the center of the adjacent regular track position. ,・
・・・・・・・・・AflIn+41 (n: integer) is formed continuously corresponding to the number of steps of the stepping motor 11, and as shown in FIGS. 1 to 3, the first small Groove A. + AH+ AI6+ A24+
A3z, A4. and the second small groove part A2. A
,,A,,,8,4゜AIQI Azz+ Atbr
A301 A341 A3111 A4g+ A461
and the third small groove part A4 r AIZI A201 A2
111, A361A, and 44 form one pitch in the circumferential direction. The tenth small grooves A0 to A4° corresponding to the normal track positions are shifted by 100 μm in the axial direction and 60′ in the circumferential direction in accordance with the track pitch of the still video floppy disk, as shown in FIG. It is formed at intervals. The second small groove part A (ari.) corresponding to the fine adjustment position is the first small groove part A.
. Adjacent first small grooves A11f at both ends in the circumferential direction of -15 μm and +15 μm, which approximately correspond to the maximum allowable off-track amount of the still video floppy disk.
The center portion of the first small groove portion All, that is, the first small groove portion Al, is formed to be shifted in the axial direction on the i side.
A third small groove A is located at a position 50 μm axially shifted from In.
. . 4 is formed. As a result, one circumference of the entire circumference is intermittently divided into 24 small grooves. The positions of these small grooves, in other words, the positions of the small grooves in the circumferential direction of the screw shaft 22 that the engager 29 engages correspond to two steps of the stepping motor, and one track can be fed in eight steps. It is now possible to do so.

Other parts of the disk drive device other than the helical groove 22b of this screw shaft 22, which will not be particularly described, are constructed in the same manner as in the conventional example described above.

Next, the operation when the carriage transport device equipped with the screw shaft 22 is used as a disk drive device for a still video floppy disk camera will be described.

First, during recording, the engaging element 29 is always located at the first submant Aan corresponding to the regular track position, and recording is performed at this position.

During playback, a first small groove, for example, a small groove A0 corresponding to a regular track position, and a second small groove A0 adjacent thereto.
-2+Az+ detect the playback output, and select the small groove portion where the maximum playback output can be obtained. If this selected small groove part is, for example, the second small groove part A2 that is shifted by +15 μm from the normal track position, then this track position shifted by +15 μm is the fine tracking position that guarantees the best reproduced image. Detection of this fine tracking position is performed every time a seek is performed, and settings are made so that the best image is always reproduced.

In this way, the playback position is set to the second small groove A! In this case, the gap G of the magnetic head is -15 as shown in FIG.
This means that the data is reproduced at a position 45 μm from μm, and if this is erased at the position of the first small groove portion A0, which corresponds to the normal track position, there will be an unerased area of about 15 μm. Therefore, when the reproduction output in the second small groove part A2 is the maximum, the engaging element 29 is positioned at the transition part S between the second small groove part A2 and the third small groove part A4 adjacent thereto, The gap G is moved further outward from the normal track position to erase it (the gap at this position is indicated by G).

This erased position is the 3-step position of the stepping motor 11, and when the engager 29 is located at this position,
Track positions between approximately 0 μm and 60 μm will be erased. In this way, if fine adjustment of +15 μm is required, image information recorded with an error of about +15 μm can be almost completely erased, so even if image information is recorded at a deviation from the normal track position, the image There is no room for information to be left behind.

In this erasing position swung outward, the small groove section that obtains the maximum output is the second small groove section A (Ilal, + A TlIn
-H, and if the track position is shifted to the positive side from the normal track position, A(87,
3, or, if it is shifted to the negative side, it is approximately the center of the groove corresponding to A(an-3> of step (8n-3). This erased position is the reproduction position Therefore, when the regular track position is selected as the playback position, it becomes the first small groove AlIn.When recording, it always corresponds to the regular track position. As a result, when re-recording is performed using the first small groove A11fi, there is no remaining image information at a track position that is not a normal track position.

Although this embodiment describes the drive bag H for a still video floppy disk that records and plays back images, it is applicable to all disk drive devices in which off-track greatly affects signal recording and playback. Needless to say, this method is particularly effective for disk drives with high recording density.

〔Effect of the invention〕

As is clear from the above explanation, when erasing information recorded at a position deviated from the normal track position, the second small groove corresponding to the fine adjustment position and the adjacent normal track position are According to the present invention, the engaging means is positioned at the transition portion between the third small groove portion corresponding to the center portion and the track position corresponding to the transition portion is erased. Just by taking care of the above transition part, no C's or S's will be generated during playback.
It is possible to remove unerased information that causes a decrease in /N, and to obtain good recording and reproducing characteristics.

[Brief explanation of the drawing]

1 to 3 are for explaining the present invention in detail, and FIG. 1 is a front view of the main parts of the screw shaft;
FIG. 2 is a plan view of the same, FIG. 3 is an explanatory diagram showing the rotation angle (number of steps) and moving distance of the spiral groove, and FIGS. 4 to 10 are for explaining the conventional example. The figure is a plan view of the main part of the disk drive device, Fig. 5 is a front view of the same, Fig. 6 is an exploded perspective view of the carriage transfer unit, Fig. 7 is a sectional view of the main part, and Fig. 8 is a main part of the screw shaft. Front view, 10.
・・・・・・・・・Carriage, 11・・・・・・・・・
Stepping motor, 12... Carriage transfer barrel, 20... Carriage transfer unit, 22... Screw shaft,
22a...Groove, 22b...
...Spiral groove, 22c...Feeding section, 28
......Intermittent drive screw, 29...
...Engagement element, A, ......First small groove part, A
+lIn+1)......Second small groove part, A(
6□Ya)...Third small groove, S+
A +an+3)...Transition part Fig. 1 Fig. 2 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9

Claims (1)

[Claims] The first track position corresponding to the regular track position of the information recording disc.
a second small groove that extends to both ends of the first small groove and corresponds to the fine adjustment track position; and a second small groove that extends to one side of the second small groove and corresponds to the center of the adjacent regular track position. A third small groove corresponding to the part is sequentially shifted in the axial direction and circumferential direction of the shaft outer peripheral part as a small groove having a linear groove bottom with an advance angle of zero to form a single spiral groove. A disk drive device comprising a screw shaft formed in the above-mentioned shape, a stepping motor for rotationally driving the screw shaft, and a carriage transport device including a carriage having an engaging means for engaging with the spiral groove. A method for erasing an information recording disk, characterized in that an engaging means is positioned at a transition between a small groove and a third small groove, and a track position corresponding to the transition is erased.