JPS61151884A - Disk driver - Google Patents

Abstract

PURPOSE:To obtain a disk driver which has high tracking accuracy and is suited to the high density recording by detecting an on-track state to a reference track of a record/reproduction head through the coincidence between small holes provided to two rotary disks having a small difference of revolving ratio. CONSTITUTION:A reference disk 11 is loaded to a turntable 9 and a disk drive motor 10 is driven. Then a step motor 4 is revolved to shift a head carriage 5. The motor 4 is stopped when a record/reproduction head 6 is set correctly on a reference track 11a. The coincidence is secured between small holes 22a and 23a of disks 22 and 23, and both disks 22 and 23 are fixed to rotary shafts 20 and 21 by means of screws 29 and 30 respectively. These disks 22 and 23 have a small difference of revolving ratio. Thus those holes 22a and 23a are separate completely from each other when a rotary shaft 4a of the motor 4 is revolved just by a single pulse. Thus the light made incident on a photoreceptor of a detection switch 28 is cut off. As a result, the detection error can be reduced less than the shift amount of the carriage 5 which is obtained when the motor 4 is revolved by a single pulse.

Description

[Detailed description of the invention] [Field of application of the invention] Books! @Ming is a ji! with Kijira and Niu heads installed on a disk-shaped recording medium! Quasi-track VC on-track is equipped with a head position fl detection device for t-horizontal movement, and is a nine-disk drive Jl! ! Regarding the casing.

[Back mold of invention]

For example, in magnetic disk devices for electronic still cameras, video floppy devices, etc., where the track pitch is very small, in a disk-driven vertical VC, the output signal deteriorates due to off-track rζ. need to be controlled.

In order to meet such technical demands, conventionally, a magnetic disk is provided with a head position detection device that detects when a reproducing head is on-track on a flfc reference track, and a head position detection device is provided to detect when a reproducing head is on track from the reference track. As a result, a disk drive device designed to regulate the distribution of balls and the position of the Nyu head becomes known.

FIG. 2 shows an example of this conventionally known Toku de C SC IIA operating device.

In this figure, 1 is chassis 7, 2.2a is chassis 1
3 is a feed screw rotatably supported on the bearing 2゜2a; 4 is a step motor that rotationally drives the feed screw 3; 5 is a head screw screwed onto the feed screw 5; The recording/reproducing head 6 is mounted on the recording/reproducing head 5; 7 is a reference track detection switch; 8 is a light-shielding piece for operating the detection switch 7; 9 is an extension of the transport path of the recording/reproducing head 6; The turntable includes a magnetic disk. 10 is a disk drive motor that drives the turntable 9 to rotate.

The detection switch 7 has a pair of emitters arranged opposite to each other.
It is composed of a tX element 7a and a light receiving element 7b,
As shown in FIG.
When the reproducing head 6 is aligned with the reproducing head 6, the light shielding piece 8 is fixed on the chassis 1 in such a positional relationship that the source of radiation from the light emitting element 7a to the light receiving cable 7b is blocked.

In the above-described conventional disk drive device, when a control device (not shown) is operated to drive the disk drive motor 10, the magnetic disk 11 mounted on the turntable 9 is moved to the rotating part w.
J-surureru. Further, when the step motor 4 is rotated step by step by operating the control device, the feed screw 3 is rotated in the forward or reverse direction, and the head carriage 5 screwed into the feed screw 3 is rotated according to 9.
is transferred along the feed screw 3 in the direction of the arrow 19.

As a result of the transfer of the head cartridge 5, when the light-shielding piece 8 formed integrally with the head carriage 5 reaches the opposing portion of the light-emitting element 7m of the detection switch 7 and the light-receiving cable 7b, the light enters the light-receiving cable 71). The light is blocked and it is possible to detect that the recording/reproducing head 6 is on track with the reference track 11a. This makes it possible to position each recording track on the magnetic disk drive 11 with reference to the reference track 11a, and to correctly on-track the recording and reproducing heads to a predetermined recording track. (Magazine [Electronic Science J, December 1980 issue) 0 The above-mentioned conventional disk drive device detects the reference track 11a, records on the required recording track, and then records the data on the reproducing head 6.
Since the recording head is transported, tracking accuracy can be improved compared to a disk drive device that does not have a head position detection device.

However, since the conventional head position detection device described above directly detects the position of the recording/reproducing head 6 by the operation of the head carriage 5, the mounting of the light emitting element 7a and the light receiving element 7b is subject to errors and If these detection capabilities directly result in errors in the head position, and if the tracking 1v degree cannot be sufficiently improved within yc, for example, if the track pitch is 48TP or 6TP
This method is effective for floppy disk devices used in manufacturing processes, but when the track pitch is 100Arh, the recording to the reference track 11a and the positioning accuracy of the playback head 6' are not as accurate as ±1.
It cannot be applied to magnetic disk devices for electronic still cameras, video storage devices, etc. that require a thickness of 3 μm or less. [Object of the Invention] The present invention solves the drawbacks of the above-mentioned prior art and provides a The purpose of this invention is to provide a disk drive device that has high recording accuracy and is suitable for high-density recording.

[Summary of the invention]

In order to achieve the above object, the present invention provides a chassis with two rotating shafts that are rotationally driven by a step motor that transports a head carriage, and a disk that rotates by having outer peripheral portions overlapped with each other on these two rotating shafts. ] and record it on each disk.

Small holes are opened in a positional relationship that matches when the playback head matches a reference track previously provided on the disk-shaped recording medium, and a pair of light emitting lights are formed on both the front and back surfaces of the disk in which these small holes are formed. A head position detection device is provided in which a detection switch consisting of an element and a light-receiving element is arranged, and the position of the recording/reproducing head can be detected by enlarging the circumference length at the position of the small hole in the disk. This is a special ridge.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a perspective view showing a first embodiment of the present invention, and the same members as shown in FIG. 3 are denoted by the same reference numerals. It is.

In this figure, 20 is a first rotating shaft, 21 is a second rotating shaft, 22 is a first disc attached to the first rotating shaft 20, and 23 is a shaft attached to the first rotating shaft 21. The attached second disk 24 is the rotating shaft 4a of the Stellar Motor 4.
K kRF) attached driving gear, 25 is the feed screw 3
26 is a first driven gear attached to the six first rotating wheels 20 and meshed with the intermediate gear 25; 27 is a attached to the second rotating shaft 21;
A second driven gear, 28, meshed with the driven gear 26 of
1 is a detection switch arranged so as to sandwich the first disc 22 and the second disc 25.

The first disc 22 and the second disc 25 include! Ic!
Recording, re-recording. A small hole 22a that matches when the head 6 is on-track on a reference track provided on the magnetic disk 11.
and 23a have been established.

The diameters and opening positions of the small holes 22a, 23a are such that, when these small holes 22a, 25a match, a sufficient amount of light can pass through to activate the light receiving element of the detection switch 28, which will be described later. When the rotary shaft 4a of the step motor 4 rotates by one pulse from the state where the light is turned, the small holes 22a and 23a are completely misaligned, so that the source of light entering the light receiving element of the detection switch 28 is blocked. Designed.

For example, the diameter of the small hole 22a is 1111. First disk 22
The distance from the center of the hole 22a to the opening position of the small hole 22a is 5. l+
w, the diameter of the small hole 25a is 1 MM, and the distance from the center of the second disk 23 to the opening position of the small hole 25a is 4s2-, then the rotation angle per pulse of the step motor 4 is 18
When the small holes 22i and 23a are aligned, when one pulse is applied to the rotating shaft 4a of the step motor 4, the relative positions of the small holes 22a and 23a are approximately 1.3 cm apart, blocking the source from the light emitting element. can do.

It should be noted that these small holes 22a and 2511 are not limited to transparent holes as shown in FIG. , a disk formed with a transparent window 22.25
In the figure, reference numeral 29 indicates that the first disc 22 is connected to the first rotating shaft 2.
0 indicates a screw that fixes it, and 30 indicates a screw that fixes the second disc 23 to the second rotating shaft 21.

The detection switch 28 has a pair of light emitting element 2814 and a light receiving element 28b facing each other.
A small hole 22a opened in the disc 22 of and the second disc 2
3, the optical axes of the light emitting element 28g and the light receiving element 28b align with the small hole 25m opened in the small hole 22a,
They are arranged in such a way that they coincide with the central axis of 23a.

The number of teeth of the driving gear 24, the intermediate gear 25, the first driven gear 26, and the second driven gear 27, and the thread pitch of the feed screw 3 are determined in advance during the movement of the recording and reproducing head. The small holes 22a and 25a are designed so that they do not coincide with each other at positions other than those where they are on-track with the reference track.

For example, the number of teeth of the driving gear 24 is 15, the number of teeth of the intermediate gear 25 is 42, the number of teeth of the first driven gear 26 is 25, the number of teeth of the second driven gear 27 is 26, and the screw pitch of the stray screw 3 is set. is 350 μm, and the small hole 22a opened in the first disc 22 and the small hole 23 opened in the second disc 23.
a matches each time the recording/reproducing head 6 is moved by about 5416 μm (every time the intermediate gear 25 makes 25×24/42 rotations and the first driven gear 26 makes 26 rotations). Therefore, if the track pick is 100 μm, 54 recording tracks can be formed on the magnetic disk 11.

The initial adjustment of the disk drive device of the first embodiment configured as described above is performed as follows.

That is, first, a reference disk 11° on which signals have been correctly recorded on a predetermined reference track 11a is mounted on the turntable 9, and the disk drive motor 10 is driven.

Next, the step motor 4 is rotated, and the recording/reproducing head 6 reads out the signal from the reference disk 11 while transporting the medium cartridge 5. The step motor 4 is stopped when the recording/reproducing head 6 is correctly on-track at the position where the output signal of the recording/reproducing head 6 reaches its maximum output, that is, on the reference track 11a. In this state, the small hole 22a opened in the first disc 22 and the small hole 23a opened in the second disc 23 are aligned, and the first disc 22 is moved to the first rotation axis using the screw 29. .

20, and the second disc 2 with screws 50.
6 is fixed to the second rotating shaft 21.

The disk drive device of the above embodiment has small holes 22a formed in two rotating disks 22.25 having slightly different rotation ratios.
, 25& match, the reference track 11
Since the on-track state of the recording/reproducing head 60 is detected with a, even if the light emitting element 2 of the detection switch 28
Even if there is an error in the precision of the mounting of the light receiving element 8a and the light receiving element 28b, the detection error can be suppressed to less than the amount of movement of the spear 5 in the head when the step motor 4 rotates for one pulse. Therefore, the number of teeth of the intermediate gear 25 is 42, and the number of teeth of the intermediate gear 25 is set to 42.
The number of teeth of the second driven gear 26 is set to 25, the number of teeth of the second driven gear 27 is set to 26, the thread pitch of the feed screw 3 is set to 350 Am, and the rotation angle per pulse of the step motor is set to 18 degrees. The example disk drive device can suppress the detection error of the reference track 111 to ±3 μm or less,
In a head stroke range of 5.4 mm, it is possible to reduce the off-tock amount to ±3 μm or less. Therefore,
It is possible to realize a high recording density disk drive device in which the track pitch varies by 100 μm.

Next, a second embodiment of the present invention will be described based on FIG. 2. FIG. 2 is a perspective view showing a second embodiment of the present invention, in which the same members as shown in FIG. 1 are designated by the same reference numerals. A plate, 40a is a small hole made in the first disk 40, 41 is a second disk, 41a is a small hole made in the second disk 41, 42 is a rotating shaft, 43
44 indicates a driving gear, 44 indicates an intermediate gear, and 45 indicates a driven gear.

The first disc 40 is a rotating shaft 41 of the step motor 4.
has been defeated by. Further, the second circle or plate 41 is attached to a rotating shaft 42 rotated by the step motor 4 via an intermediate gear 44. Said first disk 4
The light emitting element 28a and the light receiving element 28b of the detection switch 28 are placed on both the front and back surfaces of these two mutually polymerized disks. is placed. The driving gear 43, intermediate gear 4
4. The number of teeth of the driven gear 45 and the thread pitch of the feed screw 3 are recorded as in the disk sea bream driving device of the first embodiment.
It is designed so that the small hole 40a opened in the first disc 40 and the small hole 41m opened in the second disc 41 match each time the regeneration Rad 6 is transferred by about 5416 μm. The disk drive device of the second embodiment can reduce the number of gears compared to the first embodiment, so
The structure is simple and can be implemented at low cost.

It should be noted that the numerical values listed in the first and second embodiments above indicate one embodiment of the present invention, and the gist of the present invention is not limited thereto. These numbers are
It is possible to design it arbitrarily, taking into consideration the required tracking accuracy.

Further, in the first embodiment and the second embodiment, the driving force of the step motor 4 is transferred to the feed screw 3 and the rotating shaft 20,
21 (42) Although an embodiment has been described in which a gear mechanism is used as a power transmission mechanism for transmitting K, the gist of the present invention is not limited thereto. For example, winding using a timing belt can transfer the driving force of the step motor 4 to the feed screw 3 and rotating shaft 20 without slipping.
, 21 (42), or any combination thereof.

can be used.

[Effects of the Invention] As described above, the disk drive device of the present invention turns on the recording/reproducing head to the reference track at the point when the small holes formed in the two rotating disks with slightly different rotation ratios match. Since the track is detected and the detection switch is not activated even if the step Tanabata deviates by one pulse from that state, the detection error of the reference track can be kept below the amount of head movement when the step motor rotates by one pulse. be able to. Therefore, using this reference track as a reference, recording,
It is possible to perform high-precision RK positioning of the reproducing head, and it is possible to realize high-density recording with a track pitch of 100 μm or less.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a disk drive device showing a first embodiment of the invention, FIG. 2 is a perspective view of a defence-shift drive device showing a second embodiment of the invention, and FIG. 3 is a perspective view of a conventional disk drive device. It is a perspective view of a drive device. 3...Feed screw 4...Step motor 5
... head middle 6 ... recording/playback head 9
...Turntable 10...Disk drive motor 11...Disk-shaped recording medium 11a...Reference track 20...First rotating shaft 21...Second rotating shaft 22...First disk 2
3...Second disk 24, 25, 26, 27...Gear 28...Detection switch 40...First disk 41...Second disk 45, 44, 45...・・Gear rate 1 Quotation 2m A

Claims (1)

[Claims] a turntable that rotationally drives a disk-shaped recording medium;
a head carriage on which a recording/reproducing head is mounted; a step motor for transporting the head carriage in a radial direction of a disk-shaped recording medium mounted on the turntable; and a predetermined reference for the recording/reproducing head. In a disk drive device equipped with a head position detection device for detecting on-track, the head detection device is connected to two rotating shafts rotationally driven by the step motor, and one for each of these rotating shafts. It is confirmed that these two small holes are aligned with a disk that is attached and has small holes on the outer periphery with a positional relationship that matches when the recording/reproducing head is on-track to the reference track. A disk drive device characterized by comprising a detection switch for detecting.