JP3353326B2 - Measuring device, adjusting method and adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring apparatus and an adjusting method suitable for adjusting a recording / reproducing apparatus for a magneto-optical disk.

[0002]

2. Description of the Related Art When recording a signal on a magneto-optical disk with a magneto-optical disk recording / reproducing apparatus, a magnetic field is applied by a magnetic head while irradiating a laser beam to a recording position of the disk and heating the disk. Thermomagnetic recording is performed. When performing this thermomagnetic recording, it is necessary to apply a relatively large magnetic field to a beam spot position on the disk where a laser beam is irradiated to saturate the disk. Therefore,
It is necessary to bring the magnetic head as close as possible to the surface of the disk, and to position the optical pickup for irradiating the laser beam with an accurate position corresponding to the magnetic head.

FIG. 7 and FIG. 8 show a configuration near a magnetic head and an optical pickup of a conventional magneto-optical disk recording / reproducing apparatus. In FIG. 1, reference numeral 1 denotes a magneto-optical disk. It is rotationally driven by a spindle motor 2. A magnetic head 3 is arranged near the surface of the disk 1, and an optical pickup 4 is arranged on the back surface of the disk 1 facing the magnetic head 3.
In this case, the optical pickup 4 is fixed to a frame 5, and the magnetic head 3 is fixed to a tip of an arm 6 attached to the upper part of the frame 5 with a screw 8. The frame 5 can be moved linearly in the radial direction of the disk 1 along the rail 7, and the position of the magnetic head 3 and the optical pickup 4 with respect to the disk 1 changes by this linear movement.

As shown in FIG. 7, for example, the fixing state of the arm 6 by the screw 8 is such that the long hole 6a of the arm 6 is inserted with the screw 8, and the position where the long hole 6a is inserted is adjusted. The optical pickup 4 of the magnetic head 3
Is slightly adjustable.

[0005]

By such an adjustment operation, the magnetic head 3 is set to be directly above the optical pickup 4. However, in practice, it is troublesome to perform an accurate adjustment. was there. That is, the magneto-optical disk has a very high signal recording density, the pitch of tracks formed on the disk is very narrow, and even if there is a slight displacement of the magnetic head, the data recording efficiency may be reduced. However, it is very troublesome to accurately and precisely adjust the position to such an optimum position.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an adjusting measuring device and an adjusting method capable of easily adjusting the position between a magnetic head and an optical pickup of such an apparatus.

[0007]

According to the measuring apparatus of the present invention, as shown in FIG. 1, for example, error detection data output based on a detection state of an error detection circuit of a recording / reproducing apparatus 10 is output only for a reproducing period. A counter 22 for counting, a reset unit 21 for clearing the count value of the counter 22 at regular intervals, and a display unit 25 for displaying the count value of the counter 22 are provided.

Further, according to the adjusting method of the present invention, a current is applied to the head to generate a magnetic field in a non-saturated area, and recording is performed. When the recorded signal is reproduced, an error occurrence signal is counted at a predetermined cycle. The relative position between the magnetic head and the optical system is adjusted so that the displayed error rate is minimized.

[0009]

According to the adjustment method of the present invention, the relative rate of the magnetic head and the optical system is adjusted based on the adjustment method of the present invention while displaying the error rate of the reproduced data of the recording / reproducing apparatus at regular intervals by using the measuring apparatus of the present invention. By adjusting the position, it is possible to adjust the recording / reproducing apparatus optimally by adjusting the displayed error rate to a position where the error rate is minimized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In the present embodiment, the recording and / or
The adjustment of the relative position between the magnetic head of the reproducing apparatus and the optical system is performed. First, the configuration of the measuring apparatus used for this adjustment will be described with reference to FIG.

In FIG. 1, reference numeral 10 denotes a recording / reproducing apparatus for a magneto-optical disk. This recording / reproducing apparatus 10 has an error rate other than input / output terminals (not shown) for ordinary recording data and reproduction data. A monitor terminal 11 and a playback state monitor terminal 12 are provided. Here, the error rate monitor terminal 11 outputs the data of the error rate determined by the error correction circuit of the data recorded by this apparatus or the reproduced data by one.
This terminal is output for each frame. The playback state monitor terminal 12 is used when the recording / playback apparatus is in the playback state.
High-level signal is outputted, a terminal to which the low-les <br/> level signal is output when in the recording state. Note that these monitor terminals 11 and 12 are terminals that are not used in a normal use state, and may be provided, for example, inside the apparatus so that they can be used only during internal adjustment.

Then, the monitor terminals 11 and 12 are connected to the measuring device 20. The measuring device 20 includes a timer circuit 21 that outputs a latch pulse at a constant cycle, a counter 22 that counts while being reset by the latch pulse supplied from the timer circuit 21,
And a display driver 24 for displaying the count value on the display panel 25. And in the counter 22,
A process of integrating the error rate supplied from the error rate monitor terminal 11 of the recording / reproducing apparatus 10 as a count value is performed. In this case, the error rate monitor terminal 11
Rate supplied from the terminal and the playback state monitor terminal 1
AND with the data in the reproduction state supplied from 2
The logical product is taken by the gate 23 and supplied to the counter 22. Therefore, the error rate monitor terminal 11 only outputs the high- level signal as the reproduction state data supplied from the reproduction state monitor terminal 12.
The data of the error rate output from the counter 22 is counted by the counter 22. Each time the timer circuit 21 is reset, the error occurrence amount integrated immediately before the reset is displayed on the display panel 25 by a number or the like.
This display is continued until the next reset is performed.

Next, the measuring device 20 constructed as described above
First, the monitor terminals 11 and 12 of the recording / reproducing device 10 to be adjusted are connected to the measuring device 20 as shown in FIG. Is set so that the error occurrence amount of the reproduction data is displayed. In this state, a current for forming a magnetic field in an unsaturated region is applied to a magnetic head (not shown) of the recording / reproducing apparatus 10 to record some data on a predetermined track of the disk. Then, the recording data is immediately reproduced, and the error occurrence amount of the reproduced data is displayed on the display panel 25.

In this case, recording and reproduction on the disk are performed at the timing shown in FIG. That is, each time the head scans a predetermined track, the head jumps and the predetermined track is repeatedly scanned. This track jump will be described with reference to FIG. 4. A track T is spirally formed on the disk. Here, the track jump J is performed repeatedly so that one track jump is performed each time one round of scanning is performed. Only the track indicated by the solid line in FIG. 4 is repeatedly scanned.

Then, as shown in FIG. 3A,
Writing (recording) data every time one track is scanned
And read (reproduction). At this time, as shown in B of FIG. 3, the track jump is generated to the middle of the middle of writing and reading, time reproduction state signal outputted from the monitor terminal 12 of the recording and reproducing apparatus 10 is at a high level Only the counter 22 counts the amount of error occurrence. The count is reset by the latch pulse shown in FIG. 3C, and as shown in FIG. 3D, the error occurrence amount is integrated for a predetermined period from the reset timing to the next reset, and the integrated value is calculated. Are sequentially displayed on the display panel 25.

In a state where the data written on the predetermined track of the disk is immediately read out and the error occurrence amount is displayed, the relative position between the magnetic head and the optical system (optical pickup) is adjusted. . For this adjustment, for example, when a magnetic head is mounted as shown in FIGS. 7 and 8, the position of the magnetic head 3 is moved little by little by adjusting the screw 8 to find an optimum position. In this case, in this example, the position where the amount of error displayed on the display panel 25 is minimum is set as the optimal adjustment position.

Here, a description will be given of the fact that the position where the error generation amount is the minimum is the optimum adjustment position.
FIG. 2 shows the relationship between the relative positional relationship between the magnetic head and the optical pickup and the error rate. When a current that generates a saturation magnetic field is applied to the magnetic head, the magnetic head is moved to the center position (optimal position). ), There is no change in the error rate of the reproduced data even if it is moved left and right to some extent. On the other hand, when the current applied to the magnetic head is reduced to form an unsaturated magnetic field, the error rate becomes lowest when the magnetic head is at the center position,
Moving from the center position to the left or right causes the error rate to increase sharply. In this example, the adjustment is performed utilizing this fact, and the magnetic head is automatically adjusted to the center position by setting the error occurrence amount to the minimum position. In this case, in this example, since the data recorded immediately before on the same track is reproduced to detect the error rate, the reliability of the detected value of the error rate is high.

In the above-described embodiment, the switching between writing and reading of data and the track jump at the time of adjustment are performed at different timings, but may be performed at the same timing. That is, for example, as shown in FIG.
Each time scanning for a track is performed, data writing and reading are switched, and a track jump is performed at this switching timing. Even when the adjustment is performed in this manner, the same adjustment as in the above-described embodiment can be performed.

Further, data may be written and read continuously for a plurality of tracks. That is, as shown in FIG. 6A, for example, data is written to a predetermined track N, and data is also written to the next track N + 1. And writing and reading to and from these two tracks N and N + 1 are repeatedly performed. Then, the error occurrence amount is counted only during the reading period, and the count value of the error occurrence amount (D in FIG. 6) is displayed in conjunction with the latch pulse (C in FIG. 6). Here, writing and reading are performed continuously for two tracks, but writing and reading may be performed for more tracks continuously.

In the above embodiment, the relative positional relationship between the magnetic head and the optical pickup is adjusted by adjusting the position of the magnetic head. However, the adjustment is performed by adjusting the optical pickup. You may do it.

[0022]

According to the adjustment method of the present invention, while the error rate of the reproduction data of the recording / reproducing apparatus is displayed at regular intervals using the measuring apparatus of the present invention, the relative position between the magnetic head and the optical system is adjusted. By adjusting the initial position, the displayed error rate is adjusted to the position where the displayed error rate is minimized, so that the optimal adjustment of the relative position between the magnetic head and the optical pickup can be easily performed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an adjustment device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a change state of an error rate according to one embodiment.

FIG. 3 is a timing chart showing a measurement state at the time of adjustment according to an embodiment;

FIG. 4 is an explanatory diagram showing a track jump state according to one embodiment.

FIG. 5 is a timing chart showing a measurement state at the time of adjustment according to another embodiment.

FIG. 6 is a timing chart showing a measurement state at the time of adjustment according to another embodiment.

FIG. 7 is a plan view showing an arrangement state of a magnetic head and an optical system of the magneto-optical disk device.

FIG. 8 is a side view showing an arrangement state of a magnetic head and an optical system of the magneto-optical disk device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magneto-optical disk 3 magnetic head 4 optical pickup 10 magneto-optical disk recording / reproducing device 11 error rate monitor terminal 12 reproduction state monitor terminal 20 measuring device 21 timer circuit 22 counter 24 display driver 25 display panel

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-128615 (JP, A) JP-A-5-20723 (JP, A) JP-A-5-182286 (JP, A) JP-A-5-182286 12744 (JP, A) JP-A-4-186503 (JP, A) JP-A-4-157649 (JP, A) JP-A-1-158648 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) G11B 11/105

Claims (3)

(57) [Claims] A magnetic head and an optical head;
Reproduced from a recording medium by the optical head
The error rate signal indicating the error rate of the signal and the optical
Reproduction indicating the period during which the signal is being reproduced by the head
The magnetic recording and reproducing apparatus for outputting a state monitor signal;
For adjusting the relative position between the head and the optical head
In the measuring device, the output error rate signal is output as
The reproduction state monitor signal is reproduced by the optical head.
Gate means for monitoring only during the live
And an error rate signal gated by the gate means.
Integrating means for integrating the error rate signal by the integrating means
A clock means for performing a clock for initializing every time, and an error rate integrated every predetermined time by the integrating means.
Display means for displaying an error rate of the reproduction signal by a beat signal . 2. Recording comprising a magnetic head and an optical head.
A recording medium irradiated from the optical head of the reproducing apparatus to the recording medium.
So that a magnetic field in the unsaturated region is formed at the beam spot position.
To apply a current to the magnetic head to record a predetermined signal on a recording medium, the predetermined signal recorded on the recording medium reproduced by the optical head, the reproduction signal during reproduction by the optical head Error rate
Is accumulated every predetermined time, an error rate is displayed every predetermined time, and the magnetic head and the magnetic head are displayed according to the displayed error rate.
An adjustment method for adjusting a relative position with respect to the optical head . 3. Recording comprising a magnetic head and an optical head.
Relative position between the magnetic head and the optical head of the reproducing apparatus
The adjustment device for adjusting the location, and recording means for recording a predetermined signal to the non-saturation region of the magnetic field current applied to a recording medium formed by the magnetic head, the predetermined recorded on said recording medium reproducing means for playback of the signals, the adjusting device comprising a cumulative means for accumulating the error rate of the signal reproduced from said reproducing means at a predetermined time interval, and display means for displaying the cumulative result for each said predetermined period.