JPS58199469A - Recording and reproducing device using discoid recording medium - Google Patents

Abstract

PURPOSE:To secure and stabilize jumping operation by avoiding address areas where a tracking signal falls into disorder and sector separator areas during the jumping operation. CONSTITUTION:An RS flip-flop 6 is set by a jumping specifying signal (a) during the jumping operation and complement data D0-D3 on the number of tracks to be jumped are set in a counter 7 at the same time. Both information areas are detected by a sector separator area detecting circuit 8 and an address area detecting circuit 9 from a reproduction output and when fine spot light is present in both areas, an AND circuit 10 outputs ''0''. The tracking signal (g) is shaped by a shaping circuit 14 to generate a transverse signal (h) for outputting a pulse signal every time a head crosses a guide track and this signal is applied through an AND circuit 23 to a counter 7 while a jumping ON signal (d) is ''1'' to increase the counter's contents.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the following features:
This relates to a recording/reproducing device having a tracking control means for automatically scanning a signal converting means for recording or reproducing a signal, and is characterized by a jumping device that moves the signal converting means to a desired guide track when necessary.

A jumping device uses, for example, a photosensitive recording material to form a disc-shaped recording medium (disc), rotates the disc, and irradiates the disc with light such as a laser focused to a minute diameter of 1 μm or less. In an optical recording/reproducing device for recording or reproducing signals at high density as irregularities, hole formation, or changes in density, etc. on the disk,
It is an essential means for conducting searches.

In order to perform high-density recording with a narrow track pitch, an optical recording/reproducing device is provided with an optically detectable guide track on a disk, and this guide track is subjected to conventional tracking control to achieve a 3/" ,].

A device for recording and reproducing signals along or on the guide track is known, and an example thereof is described in Japanese Patent Laid-Open No. 109601/1983.

By using a disk having such an optically detectable guide track, it is possible to obtain a high-density optical recording/reproducing device that is less affected by vibrations of the device, uneven feeding of the feeding mechanism, and eccentricity of the disk.

The guide track is selected depending on the content of the information to be recorded or the signal, but generally has a spiral or concentric shape with respect to the center of the disk.

In order to record digital information on the guide track, since the length of the information is indefinite, it is advantageous to record the guide track by dividing it into a plurality of information areas (hereinafter referred to as sectors). The number of the current sector (sector number) that distinguishes these multiple sectors from each other and is currently being recorded or played back.
In order to make it clear, a sector separator area is provided in advance at the beginning of each sector. Each guide track is preliminarily provided with one or more address signal recording areas (hereinafter referred to as address areas) during one rotation of the disk, and the address of the guide track currently being recorded or reproduced is reproduced.

When attempting to perform jumping on a disk having the structure described above, the tracking signal that controls the tracking may be disturbed in the sector separator area or the address area, resulting in unstable jumping.

The present invention has been made in view of the above drawbacks, and provides a novel device that performs stable and accurate jumping operations by providing means for prohibiting the jumping device in the sector separator area or address area. The purpose is to

An embodiment of the present invention will be described below in detail with reference to the drawings. Fig. 1 shows an example of a disk used in the present invention.

Disk 1 in FIG. 1 has a sector area sj for recording information.
~S32, a sector 5/-P1 separator area SP+~5P32 for separating each sector area, and an address area TA+~Tm2 indicating a track address.

The disk is provided with a circular or spiral guide track 2, and sector separator information 9 address information is created in advance on each guide track.

FIG. 2a shows the sector area s of the guide track 2 in FIG.
+, sector separator area SP1, address area TA
A plan view of the disk along the guide track in the + section, and b also shows a sectional view of the same. The guide track is a groove with a depth δ9 and a width W, where δ is the wavelength of the laser beam, which is about the same as a human tumor, to make it easier to obtain a tracking signal, and W is about 0.6 μm to increase the density. Address area TA+ (same for Tm2) and sector separator area -8P+ (same for SP2-5P32) are provided with information on the disc in advance, regardless of the presence or absence of grooves, and are created at the same time when grooves are cut. Then, for example, an amorphous metal thin film is deposited on the entire surface of the disk 1, and optical recording and reproduction are performed in units of sectors.

3 and 4 show tracking signals when the minute spot light 5 jumps from the guiding track 6 base 3 to the adjacent guiding track 4, and FIG. 3 shows the timing when jumping to the sector area of the guiding track. , FIG. 4 shows jumping in the address area or sector separator area.

The tracking signal detection method is, for example, a known tracking signal detection method in which changes in a far-field image of reflected light from the disk are obtained from a two-split pin photodiode.

As the minute spot light 5 moves from A to O as shown in FIG. 3, in the sector area, a one-cycle figure-eight tracking signal is obtained as shown in FIG.

However, in the address area or sector separator area,
The reflected light is affected by diffraction due to the address information or sector separator information (uneven pits) transmitted on the guide track, and the tracking signal is disturbed as shown in Figure 4.

In the jumping operation, the number of tracks crossed can be obtained by shaping this tracking signal and counting 7 pages. Especially in the sector separator area or address area, the number of tracks crossed can be accurately determined due to the influence of the uneven focus. cannot be counted.

FIG. 5 shows an embodiment of the jumping circuit of the present invention,
FIG. 6 shows the output waveforms at the points a to h in FIG. 5. An embodiment of the present invention will be described in detail using both figures.

At the time of jumping, the RS flip-flop 6 is set as shown in FIG. 6 by the jumping designation signal a, and at the same time, complement data DO-D3 of the number of tracks to be jumped is set in the counter 7. The image information area is detected from the reproduced output, the sector separator area detection circuit 8 and the address area detection circuit 9, and when the minute spot light 5 is in both areas, the output of the AND circuit 1o is set to "o" (
FIG. 6C), Therefore, the jumping O of the AND circuit 11
After receiving the jumping command signal a, the N signal d is output after the minute spot has passed the address area or the sector separator area or in the sector area.

The jumping signal 0N (ld) is applied to the jumping signal output circuit 12, as shown on the e+ side of FIG. Jumping drive means (
(not shown).

On the other hand, as explained in FIGS. 3 and 4, the tracking signal shown in FIG. 6q is obtained by the minute spot light 5 crossing the guide track. The tracking signal q
is shaped by the shaping circuit 14 to create a crossing track signal that outputs a pulse signal every time the guide track is crossed, and while the jumping ON signal d is l111+, the AND circuit 23
is added to the counter 7 through the counter 7, and the count is increased.

If the minute spot light enters the sector separator area or address area during jumping, it will re-Ill (J.
1 and the tracking signal q are disturbed, so jumping is not performed between the above regions, as will be explained below.

That is, since the jumping ON signal d becomes 0'' in the 9-beta region, it is added to the brake circuit 16 through the inverter circuit 15, and the brake pulse 19 (Fig. 6e) is applied.
is generated and applied to the jumping driving means through the driving circuit 13 to stop jumping. At the same time, AND circuit 23
Therefore, the cross track signal of the waveform shaping circuit 14 is not outputted, and the counter stops counting during this time.

After the above region passes, the jumping ON signal d is turned on again? +
Since the value becomes 11+, a jumping drive signal 20°21 (e in FIG. 1) is generated to start jumping again, and the counter also operates.

The counter 7 is counted by the crossing track signal.
When the desired number of tracks is jumped and this counter overflows, one jumping stop pulse is generated from the MAX output f of the counter 7, and the brake output circuit 16 generates a brake signal 22 (Fig. e) to control the jumping driving means. In addition, stop jumping and reset RS flip-flop 6 at the same time! .・
As described above, according to the present invention, the tracking signals 10, -
,-.

Since jumping is performed while avoiding address areas or sector separator areas where the data is disturbed, the number of tracks crossed can be accurately counted, and reliable and stable jumping can be performed.

[Brief explanation of the drawing]

Figure 1 is a plan view schematically showing each area on the disk.
Figure 2a is a plan view showing the address area and sector separator area, b is a cross-sectional view of the same, and Figures 3 and 4 respectively show the relationship between the light spot and the guide track during jumping and the tracking signal waveform. 5 is a block diagram showing essential parts of a jumping device according to an embodiment of the present invention, and FIG. 6 is a diagram showing output waveforms at each point in FIG. 5. 1... Disk, 2... Guide track, TA+, TA2... Address area, SP1~
5P52...Sector separator area, 5...
...Minute spot light, 7...Counter, 1
2...Jumping signal output circuit, 13...
... Drive circuit, 14 ... Brake output circuit. Name of agent Patent attorney Toshio Nakao 1 person 1 Figure 3 Figure 55 (q)

Claims (1)

[Claims] Having a concentric or spiral guide track on the surface,
a rotationally driven disk-shaped recording medium having an address area in which address information is recorded in the guide track or a sector separator area dividing the guide track; and a signal converting means for recording or reproducing a signal on the guide track. ,
jumping means for moving the signal converting means to cross the guide track during a search; and detecting that the signal converting means has crossed the guide track based on a level change of a reproduction signal of the signal converting means, and outputting the detection output. a jumping driving means for driving the jumping means until a predetermined number is reached; a jumping driving means for driving the jumping means when the signal converting means is located in the address area or the sector separator area; A recording/reproducing device using a disk-shaped recording medium having two pages of means and means for stopping the operation.