JPS61243972A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To execute a stable kick operation by providing an auxiliary track having partially an area being parallel to a tracking track, between the tracking tracks. CONSTITUTION:On an optical card, clock tracks 21, 22,... and tracking tracks 31, 32,... are placed in advance alternately and at an equal interval, and information recording parts 41, 42,... are provided between each track. When going out of a recording area A and entering into a kick area B, an auxiliary track L is provided between both the tracking tracks. The track K is formed in parallel to the tracking tracks of both sides, in the area B and areas D, E. In this way, a kick quantity of an optical beam for the track movement can be minimized, also, the kick quantity of the time of recording and the time of reproduction can be made the same, as well, baking of an auto focus use coil is prevented, and a stable kick operation being free from a kick mistake can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an optical information recording medium, and more particularly to a card-shaped optical information recording medium provided with a tracking track for obtaining a tracking signal.

[Prior art]

2. Description of the Related Art Conventionally, various types of media, such as disks, cards, tapes, etc., are known for recording information using light and for reading the recorded information. Among these, optical optical storage media (hereinafter referred to as optical cards), which are formed in the form of cards, are expected to be in great demand as a medium that is small, lightweight, convenient to carry, and has a large storage capacity.

Figure 15 is a schematic plan view of such an original card, 101
is a recording medium, 102 is an information recording area, 103 is an information track% 104, 104' is a track selection area,
1a5 is the home position of the light beam.

The above-mentioned optical card is modulated according to the recorded information, and is optically detectable by scanning the card with a narrowed light beam (micro spots).
Information is recorded as . At this time, in order to accurately record information without causing troubles such as crossing of information tracks, the irradiation position of the light and beam must be controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as beam T). ). In addition, in order to stably irradiate the minute spot despite mechanical errors due to the bending of the optical card, it is necessary to control the optical card in a direction perpendicular to the optical card (auto 7 focusing, hereinafter referred to as MUF).

Also, during reproduction, the above-mentioned 5T and MU are necessary.

Figure 1x16 is a functional diagram of an optical card recording/reproducing device, in which 106 is a motor for driving the optical card in the direction of the arrow in the figure, 107 is a light source such as a semiconductor laser,
108 is a collimator lens, 109 is a beam splitter, and 110 is an objective lens.

111 is a tracking coil, 112 is a focusing coil, 113 and 114 are condensing lenses, 115 and 116 are photoelectric conversion elements, 117 is a tracking control circuit, and 118 is a focusing control circuit. Therefore, tracking coil 111 and 7 tracking coil 1
MuT and AP are performed by passing a current through 12.

Next, the recording and reproducing method will be explained using FIG. Initially, the light beam is at home position 105. Next, the light beam moves through the track selection area 104 in the direction U in the figure, finds the track N to be recorded or reproduced, and
Then, the AT and the MU r are activated to scan the track N in the r direction and perform recording or reproduction. When the light beam enters the track selection area 104', a large current is momentarily passed through the tracking coil 111 shown in FIG. 16 to center the light beam on the track 1. Therefore, the direction is changed to the t direction and the track N11 is scanned and recorded or reproduced. Then, depending on the amount of information, repeat this kicking motion several times. The term "kick" referred to here means, in an optical pickup device having an auto-tracking mechanism, to move the light beam from the currently tracked track to an adjacent or distant track.

However, the track pitch of an optical card is much larger than that of an optical disk, and is usually 20 μm or 40 μm.
K kicking this amount requires an excessive current to flow through the 5T coil, which may cause burn-in of the fill,
There were problems such as kick mistakes.

[Summary of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an optical information recording medium that allows stable kicking operations.

The above object of the present invention is to scan an original beam along two nine tracking tracks formed in parallel to each other.
Therefore, in an optical information recording medium on which information is recorded,
This is achieved by providing between the tracking tracks an auxiliary track having an area at least partially parallel to the tracking tracks.

〔Example〕

FIG. 2 is a schematic plan view of an optical card to which the present invention is applied. In the figure, a clock signal is recorded in advance on the optical card 1, and intermittent broken line tracking tracks 21m, 22p, 25e, . . . , and continuous linear tracking tracks 31, 3, , . . . are arranged alternately at equal intervals.

And a recording section 4 for recording information on each track opening bank.
1, 42, 43. ...is provided. The Sokusha optical card 1 has a recording section located entirely between the clock track and the tracking track.

5 and 4 are diagrams illustrating the configuration of an embodiment of an optical information recording and reproducing device for recording and reproducing information on an optical card according to the present invention. FIG. 3 is a perspective view, and FIG. 4 is a side view. FIG.

A beam emitted from a light source 11 such as a semiconductor laser is collimated by a remeter lens 12, and is collimated by a diffraction grating.
Divided into book beams. These beams are imaged by the objective lens 14 onto the optical card 1 as shown in FIG. 2, and each form a beam spot 81*82tB3. Here, the optical card 1 is moved in the direction of arrow R by a drive means (not shown), and is scanned by the beam spot in the direction in which the tracking track and the clock track extend.

The reflected light of the beam S1*52es5 passes through the objective lens again, is reflected by the mirror 15, and is detected by the collecting light lens 16 to the photodetectors 17 and 18 placed at the focal plane.
．． 19 respectively. These photodetectors are the fifth
As shown in the figure, they are arranged side by side in the two directions shown in the figure.

In addition, the light receiving surfaces of the photodetectors 17, 18, and 19 are A and B.
, O, and D.

Next, the operation of recording information on an optical card using the above-mentioned apparatus will be explained with reference to FIG. FIG. 6 shows an enlarged view of the recording surface of the optical card. First, when recording information in the recording section 41, the clock track 21 and the recording section 41. tracking track 3
Irradiate to 1.

These spots are scanned in the direction of the arrow a by the movement of the optical card 1 as described above. The reflected light from the spot S1 enters the aforementioned photodetector 17, and a clock signal is reproduced. i9, the reflected light from the spot Ss enters the photodetector 19, and a tracking signal is detected by the push-pull method. In other words, the light-receiving surface of the photodetector is y, which corresponds to the length direction of the tracking track, as shown in Figure 4.
It is divided into M, C and B, D in the axial direction. Therefore, spot ss is on tracking track 3. If it deviates from the light receiving surface, a difference will occur in the intensity of light incident on M, 0 and B, D, and a tracking signal can be obtained by comparing the signals from these light receiving surfaces. Based on this tracking signal, the spots 81°, 8□, 8. is the scanning direction Km
They are moved together in the vertical direction (direction b), and the beam T is formed.

Then, in the recording section 4°K, recording pits 5 are accurately recorded along the tracking track 3 by the spot 82.

In addition, during the above recording, the photodetector 19 also detects a focusing signal for controlling the % spot to be accurately focused on the recording surface of the optical card at the same time as the beam T. This detection principle will be briefly explained with reference to FIG. In FIG. 7, members common to those in FIG. 4 are denoted by the same reference numerals, and detailed explanations will be omitted. As shown in the figure, the incident light 20 forming the spot 82 is obliquely incident on the recording surface 21 of the optical card, and if the spot is accurately focused on the recording surface, the reflected light 22 will be The light enters the mirror 15 parallel to the incident light 20 and is guided to the detection surface 23 . However, if the recording surface shifts vertically like 21', 21' with respect to the focal position,
The irradiation position of the reflected light moves in the y direction on the detection surface 25, which is non-parallel to the incident light, such as 22' and 22', respectively. Therefore, this gradual change in the light intensity distribution in the y direction can be determined by
A focusing signal is obtained by detecting the difference in the outputs of D. According to this focusing signal, the objective lens 14 is moved in the optical axis direction to perform AP.

Next, in FIG. 1 (4), the percentage of the optical information recording medium of the present invention is shown.
Explain the image part. FIG. 1(6) is an enlarged view of the right end of the optical card as shown in FIG. 2, and corresponds to an extension of the right side of FIG. In the figure, the same parts as in FIGS. 2 and 6 are given the same reference numerals, and detailed explanations will be omitted.

When recording information, use 5K as shown in Figure 1).

First, the beam spot is tracked at the spot date while moving in the direction of arrow a, and recorded at spot 82 (position 10 in the figure). Next, when one beam spot exits the recording area, it enters the kick area B. In the kick area B, an auxiliary track X is provided parallel to the tracking track and at a distance X' away from the tracking track. Therefore,
Tracking means (for example, in FIG. 3, not shown)
The beam spot is kicked by a distance X' in the b direction by a means for moving an objective lens in two directions, etc., and the auxiliary track X is tracked at the spot S3 (position I in the figure). If the pitch X of the normal tracking track is about 40 μm, the kick amount X' at this time is 6~
Approximately 10 μm is sufficient. Then, the BS moves in the direction of arrow a on the auxiliary track X and enters area C.

In region C, the auxiliary track (position marked ■ in the diagram). Here, the tilt angle θ1 is the relative moving speed V between the beam spot and the optical card.
and the response frequency F of the tracking means (for example, KFi when tracking is performed by deflection of the objective lens.

The limit tilt angle θ' at which tracking does not deviate is as follows.

And θ1 satisfies the relationship θ, ≦θ'.

Next, the beam spot 83 is guided to a region K that is parallel to the tracking track and equidistant from the tracking tracks 31 and 32 on both sides (that is, the distance between the spots S and 83 is also the same). (Position of ■ in the diagram). At this time, the photodetector 17 receiving the reflected light from the spot S performs AT and AP, and the spot Bs
The photodetectors 17, 18, 19, which will be described later, regenerate the clock signal with the photodetector 19 receiving reflected light from the
Switch the role of the signal processing system from Here, the auxiliary track in the area is the spot S as described above.
1 and 8. Tracking track 3. by a distance equal to the distance between the tracking track 3. Therefore, spot S is on tracking track 3. It is located at the top and can smoothly switch between multiple roles.

Thereafter, the beam spot changes its moving direction to the direction of arrow a', moves while repeatedly tracking with beam spot S1, and enters area A.

Recording of information is started again at the beam spot 82 (at V ft in the figure).

The operation of reproducing the information recorded in this way using the same device will be explained using FIG. 8. The recording surface of the optical card has a clock track 2. as shown in FIG. ．． 22
, and tod trucking track 31. Information track 251 @ 252 consisting of a % recording bit string for ...
*... is formed. Here, the aforementioned spots)
S, +82+83 respectively information track 25. t) Rough Jung Track 31. The information track 25□ is scanned in the direction of arrow a. Then, the photodetector 18 detects MU T, MU! While performing this, information track 25 is detected by photodetectors 17 and
．． ．． 252 pieces of information are read simultaneously. By repeating these operations, the information in the entire area of the optical card can be recorded at the time of recording.
It can be read at twice the speed. In such an operation, it is not possible to obtain a clock signal from the clock track, but in the case of reproduction, it is possible to extract the clock signal from the signal itself recorded on the information track (so-called self-clock).
Since it can be done, there is no practical problem.

Figure 1 is a diagram explaining the operation during playback in the characteristic part of the present invention described above, and corresponds to the extension of the right side of the optical card on which information has already been recorded as shown in Figure 8. The same parts as in FIG. 8 are given the same reference numerals, and detailed explanation will be omitted.

In FIG. 1(B), the beam spot moves in the direction of arrow a while tracking at spot S, and reproducing at spot S, S, (position ! in the figure). When the beam spot leaves recording area A, it enters kick area B.
Enter K. Therefore, as in the case of recording, the beam spot is
The target is kicked a distance M

Next, the beam spot has an inclination angle of 0. It passes through area C with , and enters area E, which is parallel to the tracking track. In area E, parallel to the tracking track and distance #IIi xl or x'+2 (Position ■ in the diagram). Then, the beam spot changes its moving direction to the direction of arrow a' and enters the area again. Here, the auxiliary track' is inclined by θ2 with respect to the tracking track, and θ2 also satisfies θ2 and θ'(θ'σ limit angle).

After that, the beam spot is moved to the area 0. After passing through B and entering the recording area M, playback is performed using Spora) Sl and Sg.

FIG. 9 is a block diagram showing a specific example of a signal processing system from the photodetectors 17, 18, and 19 described above.

Here, 51 is a control circuit that controls opening and closing of switches 8W1 and sw2, 52, 55, 54, 55,
56,62°65.64,65,66.69,70,7
1.72 is an addition amplifier, 57°58.67.68.73
．． 74 indicates subtraction amplifiers 01 to 011, which are terminals. In FIG. 6, when recording is to be performed in the recording area 41, the control circuit 51 connects the switch 8W to the terminal C2 side and the switch sw2 to the terminal CB side according to the recording command. Therefore, the summing amplifier 55,
56. Through 52, the light receiving surfaces A, B, O,
The output sum of D is obtained as a clock signal OL, which is passed through a processing circuit (not shown) as a reference signal to control the recording by the spora (spora) 82. Further, the difference between the sum of the outputs of the light receiving surface C of the photodetector 19 and the sum of the outputs of B and D is obtained as a tracking signal AT at the terminal 06 through an addition amplifier 63.degree. 66 and a subtraction amplifier 68. This signal T is supplied to a tracking servo circuit (not shown) from a terminal C6. In addition, addition amplifier 64.65 and subtraction amplifier 6 are connected to terminal C9.
7, the light receiving surface area of the photodetector 19, the output sum of B and C
, D is obtained as the focusing signal AP.

This signal F is supplied from a terminal C9 to a focus servo circuit (not shown).

When recording in the recording area 42, the control circuit 51 connects the switch sw1 to the terminal C side and the switch 8W2 to the terminal 07 side. Similarly, a tracking signal AT is obtained at the terminal 01, a clock signal OL is obtained at the terminal C6, and a focusing signal A'P is obtained at the terminal C4.

Here, switching by the control circuit 51 is carried out by, for example, when an address signal for each track is recorded in advance in the recording area, this address signal is read out by the photodetector 18, and the control circuit 51 reads out the address signal based on the address signal. Then, the arrangement of the recording area to be scanned and the tracking track (which side of the recording area the tracking track is on) is determined and carried out.

Next K. When reproducing information as shown in Figure 7,
In response to a mode switching signal from the outside, the control circuit 51 sets the switch SW to playback mode.

is connected to the terminal C2 side, and the switch 8W2 is connected to the terminal 07 side. The difference between the sum of the outputs of the light receiving surfaces A and C of the photodetector 18 and the sum of the outputs of B and D of the photodetector 18 is obtained as a tracking signal AT at the terminal 010 through the addition amplifiers 69 and 70 and the subtraction amplifier 73. This signal AT is passed through a terminal subtraction amplifier 74, and the difference between the sum of the outputs of the light receiving surfaces A and B and the sum of the outputs of C and D of the photodetector 18 is obtained as a focusing signal AF.

This signal AP is supplied from the terminal "11 to a focus servo circuit (not shown). Then, from the terminals C1 and C6, a reproduced signal RF is read out by the photodetectors 17 and 19, respectively.
However, the present invention is not limited to the format described in the above embodiment, and the positional relationship between the clock track and the tracking track may be in any manner. It can also be applied to formats without clock tracks.

11 to 14 are schematic plan views of the recording surface of an optical card showing other embodiments of the present invention. By the way,
Tracking track TN.

Tll◆1 and the auxiliary track, , and 2...e
Only Kn is shown. In the figure, the hatched spot moves in the direction of the arrow. Further, a kicking operation is performed in the area indicated by k, and the spot moves from the tracking track GA to Tll◆1. θ is 0 and satisfies θ′ (θ′ is the above-mentioned limit angle of inclination). FIGS. 11 and 12 are examples in which the spot can be moved only from track TN to track T4◆1. Further, FIG. 13 shows an embodiment in which the inclination angle 0 is set to zero. In FIG. 14, n auxiliary tracks are provided between the tracking tracks TN and TI+1, 2...Kn are provided between the tracking tracks TN and TI+1, and n+
This is an example of moving the spot by repeating one kicking motion.

〔Effect of the invention〕

As explained above, the present invention provides an auxiliary track between the tracking tracks, which has an area at least partially parallel to the tracking track, thereby minimizing the kick amount of the light beam for moving the track. It is possible,
Also, since the kick amount can be made the same during recording and playback, the problem of AT coil burn-in has been resolved, and stable kicking operations without kick errors are now possible.

[Brief explanation of the drawing]

1(A) and (n) are schematic plan views showing the configuration of characteristic parts of the optical information recording medium of the present invention, FIG. 2 is a schematic plan view of an optical card to which the present invention is applied, and FIG. and FIG. 4 are schematic diagrams showing the configuration of an example of an apparatus for recording and reproducing the medium of the present invention, FIG. 5 is a diagram showing the arrangement of photodetectors in the apparatus of FIG. 3, and FIG. 7 is a diagram illustrating the principle of detection of focusing signals in the device shown in FIG. 3, and FIG.
9 is a block diagram showing an example of the configuration of the signal detection circuit in the device shown in FIG. 3, and FIG. 11, 12, 13, and 14 are schematic plan views showing other embodiments of the present invention, FIG. 15 is a schematic plan view of an optical card, and FIG. 16 is a schematic plan view of an optical card. FIG. 2 is a schematic configuration diagram illustrating the functions of a card recording/reproducing device. 21.22.25... Clock track 31.52.
・・Tracking track"p'2T'S ・・
・Recording section 251.25g, 25g, 254...Information track 8
, , s2 , s Self-beam spot, ni'...Auxiliary track 1/Figure 1? is/θ5

Claims (1)

[Claims] (1) In an optical information recording medium in which information is recorded by scanning a light beam along a plurality of tracking tracks formed in parallel to each other, at least a portion of the tracking tracks are located between the tracking tracks. An optical information recording medium characterized in that an auxiliary track having an area parallel to a tracking track is provided.