JPS63164081A - Writing device for servo track of magnetic disk - Google Patents

Abstract

PURPOSE:To read information whose quality is equivalent to that of a signal that a magnetic disk device obtains from a servo track and to accurately confirm by providing, in addition to a servo track write mechanism, a read head dedicated for confirming and a mechanism the positioning of said head. CONSTITUTION:When positioning the head 4 on a target track, a servo track write information generated by a computer 14 is amplified by an amplifier 13 and a pre-amplifier for write 12, so that a magnetic pattern is formed on a magnetic disk 3 by the head 4. Next, this magnetic pattern is read by a read-only head 9 and amplified by a pre-amplifier 15 and an amplifier 9 dedicated to read, then transmitted to a verification circuit 17 and the computer 14. Thus, a position control signal similar to that in the magnetic disk device on which the disk is loaded is generated, and a drive motor 11 for read is excitened with this signal, so that a positioner 10 for read and the head 9 are positioned in the same position as that in which the servo head of the magnetic disk device is positioned. As a result, an accurate verification (confirmation) can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk servo track writing device for writing servo tracks on a magnetic disk mounted in a magnetic disk drive.

[Prior Art] FIG. 3 is a schematic diagram of a conventional servo track writing device disclosed in, for example, Japanese Unexamined Patent Publication No. 59-146484.

In the figure, (1) is the base, (2) is the spindle on which the base (1) is mounted, (3) is the magnetic disk group attached to the spindle (2), and (4) is the write/read head. ,(
5) is a positioner to which the head (4) is attached; 3 (6) is a drive motor that moves the positioner (5); and (7) is a drive motor that fires a laser beam at a target to measure the moving distance of the positioner (5). Laser range finder, (8) is positioner
(5) is a mirror that is attached to the mirror and reflects the laser beam.

FIG. 4 is a block diagram showing the flow of track information in FIG. 3, and (18) is a preamplifier for writing/reading only. (13) is a write-only amplifier, (
14) is a computer that processes data, (16) is a read-only amplifier, and (17) is a verify circuit.

FIG. 5 is an explanatory diagram showing the positional relationship between the magnetization pattern of servo track information on the magnetic disk (3) and the head (4). In FIG. Magnetization pattern, (20a) (
20b) is a magnetization pattern for position detection pulse generation written when the head (4) is at position 81 or a2;
(21a) and (21b) are magnetization patterns for position detection pulse generation written when the head (4) is at position C.

Next, these operations will be explained. First, the laser beam emitted from the laser range finder (7) is reflected by the mirror (8) attached to the positioner (5), and is received by the laser range finder again.
Since the relative positional relationship of 4) is determined, the target track (position of the head) is determined, and then the drive motor (
6) to position the head (4) on the target track. Also, the servo track writing information generated by the computer (14) is amplified by the write amplifier (13) and the preamplifier (18), and then
4) to sequentially form a magnetization pattern as shown in FIG. 5 on the magnetic disk (3). That is, head (4)
is the magnetization pattern (20a) (20b) at the position (a)
), and then write the magnetization pattern (21a) at the position (c).
) After writing (21b), return the head (4) to the position of (b). And the pattern (20a) (20b
) and adjacent patterns (21a) (21b
) is balanced with the readout signal of the head (4). Next, at this adjusted head position (b), the head (4) reads a signal based on the magnetization pattern, which passes through the preamplifier (18) and read-only amplifier (16) and enters the verify circuit (17).
The output signal is combined with the setting value of the computer (14) to confirm the signal quality. And as a next step,
The head (4) is positioned at position (a2) and the same procedure is repeated to form servo track information.

[Problems to be Solved by the Invention] The conventional servo track writing device is configured as described above, and writing of servo information, head positioning adjustment, and verification operations are performed using the same head and positioner.
This will be done using

In general, servo track writing devices require much more precise positioning than magnetic disk devices that actually use magnetic disks with servo tracks written on them, so they require a highly stable servo system. need to be formed.

For this purpose, the rigidity of the servo system such as the positioner that supports the head is increased, and this servo system is used to adjust the position of the head and perform the verification operation.
The quality of the read signal is checked by a servo system different from that of the magnetic disk device actually used, and the signal quality is different from that when the same processing is performed on an actual magnetic disk device, resulting in false judgments. There was a risk of doing so.

[Means for solving problems] A servo track writing device according to the present invention.

In addition to the write head, a positioner for positioning the write head, and a drive motor, a positioning mechanism such as a read-only head and a positioner for reading information and checking signal quality is separately provided.

[Function] In this invention, since the reading head and its positioning mechanism are provided separately as the servo track writing head and its positioning mechanism, this servo track serves as the reading head and its positioning mechanism. By using the same head and its positioning mechanism as the magnetic disk device that mounts the embedded magnetic disk, it is possible to check the same information as the quality of the servo track obtained by the magnetic disk device.

[Example] An embodiment of the present invention will be described below.

In FIG. 1, the parts numbered from (1) to (8) are the same parts as in FIG. 3 above. (9) is a read-only head; (10) holds this read-only head (9);
The reading positioner 1 (ll) for positioning is a reading drive motor that drives this positioner (lO), and this positioner (10) and drive motor (11
) constitute a reading head positioning mechanism. FIG. 2 is a block diagram showing the flow of track information at this time, with symbols (3) (4) (13) (14)
(16) and (17) are the same parts as in FIG. 4 above.
(12) is a write preamplifier, and (15) is a read preamplifier.

Next, these operations will be explained. First, the laser beam emitted from the laser range finder (7) is reflected by the mirror (8) attached to the positioner (5), and is received by the laser range finder again to determine the position of the positioner (5) ( distance traveled) is detected. Here, the above positioner
(5) and the head (4) are fixed, the target track is determined and then the drive motor (
6) to position the head (4) on the target track. Also.

The servo track write information generated by the computer (14) is amplified by a write-only amplifier (13) and a write preamplifier (12), which in turn creates a magnetized pattern on the magnetic disk (3) by the head (4). Form.

The read head (9) reads the magnetization pattern, and the signal is amplified by a read preamplifier (15) and a read-only amplifier (16), which is then sent to a verify circuit (17) and a computer (14). communicated. Here, a position control signal similar to that of the magnetic disk device to which the magnetic disk (3) is to be installed is generated, and this 1
By exciting the read drive motor (11) with No. 8, the read positioner (10) and the read-only head (9) held therein are positioned at the same position as the servo head of the magnetic disk drive. be done. The quality of the signal read at this position is confirmed again by the verify circuit (17) and computer (14).

In the above embodiment, the track position ill'l distance is determined using a laser range finder, but other means such as an optical field encoder may be used. In addition, in the above embodiment, an example was given in which all the reading sections for verification were dedicated, but servo track writing is performed while the head, positioner, and drive motor of the servo track writing device are mounted on the disk device. and the head in a disk device.

Even if positioning and reading are performed using a positioner and a drive motor, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, in addition to the servo track writing mechanism, it has a read head dedicated to verification and its positioning mechanism, so that it can be used with the same one as that of the disk device. By using this, it is possible to read a servo track signal of the same quality as the quality of the servo track read by the disk device, and there is an effect that a magnetic disk servo one-rack writing device capable of accurate verification can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block RIA diagram showing the flow of information on a servo track in this embodiment, and FIG. 3 is a block diagram showing a conventional servo track writing device. FIG. 4 is a block diagram showing the flow of servo track information in a conventional servo track writing device, and FIG. 5 is an explanatory diagram showing the positional relationship between the magnetization pattern of servo track information on a magnetic disk and a head. In the figure, (1) is the substrate, (3) is the magnetic disk, (4)
is the head, (5) is the positioner (head positioning mechanism), (6) is the drive motor (head positioning ia structure), (
7) is a laser range finder, (9) is a servo track read-only head, (10) is a read positioner (read head positioning mechanism), and (11) is a read drive motor (
(14) is a computer, and (I7) is a verify circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) Servo tracks containing servo information are sequentially written at predetermined positions on the magnetic disk, the servo information is read from the written servo tracks, and the read head is positioned using the read signals. In a magnetic disk servo track writing device for confirming the position of a servo track that has been inserted, the reading head and its positioning mechanism are provided separately from the servo track writing head and its positioning mechanism. A magnetic disk servo track writing device characterized by (2) The magnetic disc according to claim 1, wherein the reading head and its positioning mechanism are the same as a magnetic disk device to which the magnetic disc is mounted and used. Servo track writing device