JPH01166340A - Optical information recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical information recording/reproducing apparatus, and more particularly to an optical information recording/reproducing apparatus that performs an auto-tracking operation using a three-beam method.

[Prior Art] Conventionally, persimmon-shaped media such as disk-shaped, card-shaped, and tape-shaped media are known for recording information using light and reproducing the recorded information. Among these, optical information recording media formed in the form of cards (hereinafter referred to as optical cards) are expected to be in great demand as mediums with a large storage capacity BT that are small, lightweight, and convenient to carry.

The optical information recording medium described above scans a track previously formed on the medium with a light beam that is modulated according to recorded information and focused on H minute spots.
Information is recorded as an optically detectable recorded bit string. At this time, in order to accurately record information without causing problems such as crossing of recorded bit strings, the irradiation position of the light beam is controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as T). It is also necessary to perform focus control (autofocusing, hereinafter referred to as ΔF) in order to keep the light beam accurately focused on the medium.

FIG. 6 is a diagram showing a schematic configuration of an optical information recording/reproducing apparatus using an optical card as a medium, as an example.

In the figure, the first card 20 is placed on a mounting table 22 fixed to a belt 21. The belt 21 is passed around pulleys 23 and 24, and is moved by the motor 25 in the six directions of the arrows, and the optical card 20 accordingly reciprocates in the six directions. The motor 25 is controlled by a motor drive circuit 26.

30 indicated by a broken line is an optical head. Laser drive circuit 4
The light flux from the conductor laser 31 is controlled by 0, and is converted into a parallel light flux by the collimator lens 32, and converted into 0th-order light and ±1st-order diffracted light by the diffraction grating 33. After that, polarizing beam splitter (P13S) 34.1/4
The optical card 2 is transmitted through the wavelength plate 35 and the objective lens 36
0 as three minute spots. The light beam reflected by the optical card 20 passes through the objective lens 36° and quarter wavelength plate 35 again, is reflected by P[3S:34, passes through the spherical lens 37 and the cylindrical lens 38, and reaches the photodetector 39. reach.

Recording of information on the optical card 20 and reproduction of information from the optical card 20 are performed using the zero-order light. Furthermore, AF using the astigmatism method is also performed using zero-order light. Further, Δ'F by the three-beam method is performed using the ±1st-order diffracted light. The basic principles of the astigmatism method and the three-beam method are well-known techniques and will not be described here.

No. 18 detected by the photodetector 39 is transmitted to a signal demodulation circuit 41, an AP control circuit 42 . The signal is sent to the AT control circuit 43. The AP control circuit 42 and the AT control circuit 43 respectively move the objective lens 36 in the optical axis direction (in the direction of arrow B) and in the C direction (perpendicular to the paper plane) perpendicular to the six directions and the B direction.
Perform AF and 8T.

The signal demodulation circuit 41 demodulates the detected signal into an information signal.

The stepping motor 44 moves the optical head 30 in the C direction, thereby performing track access (seek operation).
Do this.

Furthermore, the motor drive circuit 26 and the laser drive circuit 4
0, signal demodulation circuit 41. ΔF control circuit 42, AT control circuit 43. The stepping motors 44 are each connected to a central processing unit (CPU) 46 via an interface 45.

FIG. 7 is a schematic diagram showing the relationship between spots and tracks on an optical card during recording.

In the figure, a plurality of information tracks +1 for recording information are previously formed on the optical card 20. A tracking track 12 exists between adjacent information tracks 11 to separate the information tracks. The information track II and the tracking track 12 can be distinguished, for example, by having different reflectances or by providing a step in the direction perpendicular to the paper surface. In FIG. 7, there are 9 O-order optical spots for the information track 11° with track number M! When recording bit 13, +1st-order diffracted light 2 is transferred to information track 11, tracking track +2. On which boundary, the first-order diffracted light 3 is further connected to the information track 114 and the tracking track 12M-1.
It shows how the two are positioned on the boundary between the two and performing ΔC.

[Problems to be Solved by the Invention] However, when recording in the state shown in FIG. 7, an offset occurs during recording, and as a result, there is a drawback that the pit 13 cannot be recorded at the center of the information track 11. 3
8T by the beam method consists of the 11th-order diffracted light 2 and the 11th-order diffracted light 3.
This is done by detecting the respective amounts of reflected light with the photodetector 29 and moving the objective lens 36 so that the difference between them becomes zero. However, as is clear from FIG. 7, information track 11. When recording the above, −1st order diffracted light 3
is information track 1, and tracking track 12m
−+ Affected by which boundaries and further recorded bits 13. On the other hand, since the +1st-order diffracted light 2 is in the unrecorded area, it is not affected by the bit 13. Therefore, when the 0th-order light is located at the center of the information track lll1, the difference in the amount of reflected light between the ±1st-order diffracted light is not zero, and as a result, the 0th-order light l is displaced from the center of the information track +1+m in either the vertical direction on the paper. In this state, A1' control is performed so that the difference in the amount of reflected light becomes zero.

However, during playback, since information is often already recorded from end to end on the information track that is the target of playback, both the ±1st-order diffracted light is affected by bit +3, and the optical card 20 and optical Since the head 30 moves linearly at a relatively high speed, the influence of the bit 13 on the n11 ±1st-order diffracted light is almost the same, and as a result, the 0th-order light 1
AT control operates so that the information track II is located at the center of the information track II.

Therefore, the center position of the O-order light 1 during reproduction does not coincide with the center of the bit iris 3, which introduces a deterioration in the quality of the reproduced signal.

In order to eliminate this inconvenience, it is possible to match the center of the bit with the center position of the zero-order light at the time of waiting by using the controller 1t which gives an offset to the T control in advance either during recording or during playback. It is conceivable that the electrical processing system would become complicated, which is undesirable, or by making the width of the information track 11 sufficiently wide compared to the diameter of the minute spot,
It is possible to prevent AT offset during recording, but
In this case as well, the storage capacity of the optical card 20 will be reduced, which is not preferable.

Means for Solving Problem E] In view of the above-mentioned problems of the prior art, an object of the present invention is to provide an optical information recording device that can accurately perform A' both during recording and reproduction. It is in.

The purpose of the above is to optically record information while performing automatic tracking control using the three-beam method on an optical information recording medium in which a plurality of information tracks on which information is recorded are formed in advance. and/or in an optical information recording and reproducing device that performs reproduction, when the track number of the information track to be recorded is represented by M, the number 2 used for auto-tracking of the three-beam method
The two spots are located corresponding to two information tracks having track numbers M±(2N-1) (both M and N are positive integers), and from the information track with track number M. When recording, if M is an odd number, an odd numbered information track is selected and recorded, then an even numbered information track is selected and recorded, and if M is an even number, the information track is selected and recorded. This is achieved by an optical information recording/reproducing bag:n, which is characterized in that even-numbered information tracks are selected for recording, and then odd-numbered information tracks are selected for recording.

[Function] In the optical information recording/reproducing apparatus of the present invention as described above,
When recording or reproducing the information track 11- with the number M, the ±1st-order diffracted light is positioned so as to correspond to the information track 11- with the number M±(2N-1), and the H
In recording, for example, M first records only on odd-numbered information tracks 11, and after recording on all odd-numbered information tracks 11, records on even-numbered information tracks 11. By doing so, during recording, the conditions of the tracks from which tracking error signals are taken on both sides of the information track are the same, and the drawbacks of the conventional example described above can be overcome.

[Example] Hereinafter, the optical information recording internal production device of the present invention will be described in detail based on a specific example.

When the optical information recording and reproducing device n of the present invention is applied to an optical card recording and reproducing main device, the mechanical device configuration is as follows.
The configuration is similar to that shown in the figure. However, since it is necessary to select and record the information track as described below,
To apply this to a conventional device, it is necessary to provide a new control circuit for this purpose or to incorporate a program for that processing into the sequence of Cl) LJ 46 in FIG.

Note that, due to its nature, the present invention is applicable not only to card-shaped recording media but also to disk-shaped recording media and the like.

FIG. 1 is a diagram for explaining the present invention in detail, and is a schematic diagram for explaining the relationship between spots and tracks on an optical card and the recording method thereof. For convenience of explanation, it is assumed that 1M is an odd number. Recording is first performed using the 0th order light 1 on odd numbered information tracks II+, IIs, "", l111.
-i, Ilm.

This is performed only for + 1 , , , -... At this time, +1st-order diffracted light 2 and -1st-order diffracted light 3 are each L-3=
It is located at the end of the information tracks IILI and IIL-1 numbered M+ (2N-1), L-, =M-(2N-1). (However, in the embodiment shown in FIG. 1, an integer of 1F, N=1, that is, L+ = M+1.l, -1=M-
1, the ±1st-order diffracted light beams 2°3 correspond to information tracks 11□1.11. , at the end of the . M+1
1M-1 is an even number, and information track l 111. +
, l +-+ has not yet recorded information, so the AT control signal is not affected by the already recorded bit 13, and therefore the information track 11 . iJ Noh is about recording at the center of the world.

Figure 2 shows even numbered information tracks;
The state of recording to lm-+ is schematically shown.

As explained using FIG. 1, all the odd lean bar information tracks...l111-, , Il
,-a.

I+,,11. ,,． It is shown that recording to 11□4... has been completed. When recording information on even-numbered information tracks l1v-+, the +1st-order diffracted light 2 affects the bits on the information track il=+, and the -1st-order diffracted light 3 affects the bits on the information track l1v-i. affected by each. However, since the optical card 20 and the optical helad 30 relatively move linearly at high speed in the left and right directions in the figure, the influence on each diffracted light can be considered to be almost equal, and as a result, the information track IIM It is possible to record at the center of -+.

As is clear from the explanation using FIGS. 1 and 2, even when 1j is generated from the information track 11, both the ±1st-order diffracted lights are located at the edge of the information track where the bit 13 does not exist, or Alternatively, both are located at the end of the information track where bit 13 exists, and as a result, it is possible for the O-order light l to pass through the center of bit 13 and reproduce the signal.

In the explanation using Figures 1 and 2, recording starts from the odd-numbered information track, and after recording is finished for all the odd-numbered information tracks, recording is performed for the even-numbered information track. Although we have shown an example of starting , the reverse may also be used.

FIG. 3 is a diagram showing the state of recording at the edge of the recording area. For convenience of explanation-F, information is recorded in information tracks 111 to 11. with subscripts 1 to i. shall be carried out against.

First, a case will be described in which recording is first performed on odd-numbered information tracks, and then recording is performed on even-numbered information tracks later. In this case, in order to perform recording on the information track 11+, it is sufficient to have a tracking track 12-1 formed with physical characteristics such as the same pitch and equal line width of 1 as the tracking track 12, and the zero-order Light 1. ．． By moving the +1st-order diffracted light 2t and the 1st-order diffracted light 31 by 16 degrees as shown in the figure, the recording becomes 6
It is Ding Noh.

Consider recording to the opposite end, ie, information track II. At this time, if i is an odd number, the tracking track 120. , and O-order light +2.
Recording is possible by arranging the +1st-order diffracted light 2□ and the -1st-order diffracted light 38 as shown in the figure. Also, if i is an even number, recording to information track ll+-+ has been completed before recording information track I+.
Information track 11. It is preferable that some bits are already formed in the , , and . The bits recorded on the information track +1+- do not have to be meaningful as information, and furthermore, the existence of the bit string itself is ml! ' and
The center of the pit row does not need to completely coincide with the center of the information track +-+, so for example, after recording to the information track opening -1, the tracking track 12. . Using the proverb, by setting the arrangement a of the 0th order light 1*, + 1st order diffracted light 21, = 11th order diffracted light 3 as shown in the figure, information track II, . . . If hetami data is recorded,
This becomes suitable for later recording onto the information track 12+.

Next, a case will be described in which recording is first performed on even-numbered information tracks, and then recording is performed on odd-numbered information tracks.

Information track I1. When recording onto the top, since the information has already been recorded on the top of the information track, dummy data has also been recorded on the information track 11.
For example, after recording to the even numbered information track is completed, the tracking track 12 is preferably
-8, θ-order light 1 a, + + order diffracted light 2.
．． Dummy data may be recorded on the information track 11° by arranging the −1st-order diffracted light 34 as shown in the figure.Next, the information track 11. However, if i is an even number, the 0th order light 1 m, + 1st order diffracted light 2 m,
Recording is possible by the arrangement of the first-order diffracted light 32,
When i is an odd number, 0th order light 13, +2nd order diffracted light 2
Information track III□ by arrangement of s, -J order diffraction light 33
Record dummy data on the top in advance 1■
As a result, recording on the information track 111 is completed.

As explained above with reference to FIG. 3, information tracks 11+ to 11. on which regular information is to be recorded. By forming a plurality of information tracks for dummy data and tracking tracks on the outer side of each end, it is possible to perform suitable recording.

[Other Embodiments] A historical embodiment of the recording method and recording/reproducing apparatus according to the present invention will be described below.

In Figure 2, for the sake of explanation, let M be odd.

After recording to the odd numbered information track 11, recording is performed to the even numbered information track +1, and now 1
1.3, recording is assumed to have ended at -[-1, 11n-+. When reproducing information from the optical card in this state, if a device with the same configuration is used, when reproducing the information on the information track llv, the +1st-order diffracted light 2 is transmitted to the unrecorded information track 11. The -1st order diffracted light 3 is located at the end of +□, and the -1st order diffracted light 3 is located at the recorded information track ll.
Since it is at the end of m-+, it is possible that an offset will occur in the AT signal, leading to a decrease in the quality of the raw signal (this problem does not occur when playing from other information tracks. ) Therefore, a more suitable recording method for recording and recording with an apparatus having the same configuration will be explained with reference to FIGS. 4 and 5.

When recording a chunk of information on an optical card, it is possible to know how many information tracks the information to be recorded corresponds to in the item 651. Fourth
The figure shows an example in which the information t1 to be recorded corresponds to an odd number of information tracks, for example three. Already from the bottom of the figure, information track 11. In the case where it is assumed that recording has been performed up to -2, 11. ．． Recording is performed in the order of 117*i % I I Jul, and information track I 1. , I IJ,
In order to improve the iQ raw state of , dummy data 1
4 (indicated by a broken line) is the last information track IJ-1,
I IJ, record in s. As a result, the information track 1 can be transferred to the information track 1 while performing accurate AT sub-control.
1. , l I,,.

, 11J,, It is possible to make the above record 1[i cow. At this time, the flow of recorded information is I IJ, 11J
-1, 11, , even if they occur in the order of ambivalence and have meaning, I l, , l IJ+l, l lJ
, i may occur once and have a meaning.

After this, when recording the next set of information, leave one information track blank11. . 4)
, information track I+, , it is sufficient to start recording from the information track I+, , s.

An example will be explained in which the information m to be recorded corresponds to an even number of information tracks, for example, four tracks. In this case, for the information track, IIJ, IIJ-*, IIJ
. 4. IIJ-1, l +, , , , 11. It is preferable to record in the order of . However, information track I
IJ-1,l Dummy data 14 is recorded in IJ44H. After that, when recording the next set of information, the information track Ila,a is left blank and the information track IIJ is recorded.

You can start recording from 6.

In the embodiment described using FIG. 4, there are two -
There are two information tracks on which dummy data 14 is recorded between the pieces of information. For example, information track I
They are IJ41 and IIJ-4. Therefore, when a relatively small amount of information is recorded sequentially, the ratio of the number of information tracks on which dummy data having no meaning as information is recorded to the total number of information tracks increases. Therefore, an exemplary embodiment that improves this point will be explained using FIG. 5.

In Fig. 5, the information track I is already starting from the bottom of the figure.
It is assumed that recording is being performed up to IJ-1. An example will be shown in which the amount of information to be recorded corresponds to an odd number of information tracks, for example three.

In this embodiment, 11 for the information track. +
1 Recording is performed in the order of 11J+-, IIJ, and 1la-s. However, information track 11. Dummy data is recorded in and. Also, to record the amount of information for an even number of videos, - for example, the information equivalent to 4 videos, l +,...
, I IJ. , , IJ, , IIa+i+]14, and so on. In this case, information track 11
．． Record dummy data in □.

In the above explanation, an optical card was used as an example of an optical information recording medium, but as mentioned above, it is clear that the present invention can be similarly applied to media such as optical disks and optical tapes. be.

[Effects of the Invention] As described in detail above, according to the optical information recording and reproducing apparatus of the present invention, the optical information recording + IG production apparatus that performs Δ]° control using the three-beam method, Number M
Information track 11. When recording against
The ±1st-order diffracted light is made to have the modality 1 corresponding to the information track 11□JPN-11゜11 v-+2H-n with the number M±(2N-1) (however, M and N are positive integers)
For example, when recording from an odd-numbered information track, use a recording method in which recording is performed on the odd-numbered information track, and then recording is performed on the even-numbered information track. This prevents tracking deviations due to differences in optical detection between recorded and unrecorded information tracks, and enables accurate information recording and information self-generation.

[Brief explanation of the drawing]

Figures 1, 2, and 3 show the light of the present invention, respectively. 1 is a diagram for explaining an embodiment of a digital information recording and reproducing device. FIG. 4 and FIG. 5 are diagrams for explaining further embodiments of the present invention, respectively. FIG. 6 is a diagram showing the configuration of the optical card recording/reproducing device. FIG. 7 is a diagram showing a conventional recording method. 1: 0th order light, 2: +1st order diffracted light, 321st order diffracted light, 11: Information track. 12 tracks for tracking, 13: bits, 14: dummy data. Agent Patent Attorney Jo Taira YamashitaFigure 2Figure 3Figure 4Figure 5Figure 7

Claims (1)

[Claims] (1) For optical information recording media in which multiple rows of information tracks on which information is recorded are formed in advance,
In an optical information recording and reproducing device that optically records and/or reproduces information while performing auto-tracking control using the three-beam method, when the track number of the information track to be recorded is represented by M, the auto-tracking control of the three-beam method is performed. Used for tracking 2
The two spots are located corresponding to two information tracks having track numbers M±(2N-1) (both M and N are positive integers), and from the information track with track number M. When recording, if M is an odd number, an odd numbered information track is selected and recorded, then an even numbered information track is selected and recorded, and if M is an even number, the information track is selected and recorded. An optical information recording and reproducing apparatus is characterized in that it selects even-numbered information tracks for recording, and then selects odd-numbered information tracks for recording.