JPS61243969A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To minimize kick quantity and to execute a stable kick operation by providing an auxiliary track having an area being parallel to a tracking track and an area making a prescribed angle against the 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 K which is in a near distance to one tracking track and parallel to the tracking track is provided. Subsequently, when entering into an area C, the track K is provided so as to be inclined by theta1 against the tracking track and when entering into areas D, E, the track K is provided so as to be in an equal distance to the tracking tracks of both sides and parallel to each tracking track. In this way, the kick quantity for moving the track can be minimized and the stable kick operation 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]

Conventionally, information is recorded using light and the recorded information is read out in the form of a medium, and it is in the form of a disk.

Various types of oak are cut into card and tape shapes.

Among these, card-shaped optical recording media (hereinafter referred to as optical cards) are expected to be in great demand as mediums with large storage capacities that are convenient for small children to carry.

FIG. 11 is a schematic plan view of such an original card, with 10
1 is the recording medium, 102 is fI! 103 is an information track, 104.1048 is a track selection area, and 105 is the home position of the original beam.

The above-mentioned optical card is modulated according to the recording fi# information, and by scanning the card with an original beam focused on a minute spot, information is transmitted as an optically detectable recording pit row (f# information track). recorded.

At this time, in order to accurately record information without causing problems such as crossing of information tracks, the irradiation position of the light beam is controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT). There is a need to. In addition, in order to stably irradiate the minute spot despite the bending of the optical card and mechanical errors, it is necessary to control it in a direction perpendicular to the optical card (auto 7 focusing, hereinafter referred to as AP).

The above AT and AP are also required during playback.

FIG. 12 shows a functional diagram of the original card recording/reproducing device, where 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, and 107 is a light source such as a semiconductor laser.
08 is a collimator lens, 109 is a beam splitter,
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
118 is a tracking control circuit, and 118 is a focusing control circuit. Therefore, by passing current through the tracking coil 111 and the 7 tracking coil 112, A
T, perform AP.

Next, the recording/reproducing method will be explained using FIG. 11. At first, the light beam is at home in 105, N. Next, the source beam moves through the track selection area 104 in the direction U in the figure, finds the track N to be recorded or reproduced, operates AT and Al', and scans the track N in the r direction. Record or play back. When the original beam enters the track selection area 104'', a large current is momentarily passed through the tracking coil 111 shown in FIG. 16 to move the original beam to track N+1.Then, the direction is changed to track N+1 Then, depending on the amount of information, this kicking operation is repeated several times.The kicking referred to here is when an optical pickup device with an auto-tracking mechanism scans the original beam and records or reproduces it. moving from one track to an adjacent or more distant track.

However, the track pitch of the original card is much larger than that of an optical disc, and is usually 20 μm to 40 μm.
m, and lζ to kick this t requires an excessive current to flow through the AT coil Iζ, resulting in problems such as coil burn-in and kick errors.

FIG. 13 is an enlarged view of the track selection area 104I of the optical card of FIG. 11, for example, and is a diagram illustrating a case where the tracking role is switched between multiple beams. As shown in the figure, in the information recording area 103, a clock track 20 is formed in an intermittent broken line shape with a clock signal recorded in advance.
21 t202t t2023..., a tracking track 203b2 formed in a continuous line shape
03z +203m... songs are arranged alternately at equal intervals. And a recording section 2041°204*+204m for recording information between each track.
is provided.

First, when recording information in the recording section 2041, the spots s and IsltSB are respectively clocked on the clock track 2o2.
1. Part 204x t) Racking track 203t
Irradiate it. Then, while tracking at spot S3 and reproducing the clock at spot S,
Record @8 at spot S2. After recording, when entering the track selection area 1041 (1's d in the figure), the distance XI beam spot is kicked in the direction of the arrow, and at the same time the role of the beam that was tracking is changed to the spot Ss.
Switch from to Sl. And, Subo) Sl
Tracking is performed at (the position marked ■ in the figure), the movement direction is switched, and while the clock is reproduced at the spot S3, information is recorded in the recording f42042 at the spot Sg (spot (It) at the position ■ in the figure).

However, in this way, the tracking signal 811! between multiple beams! When switching the beam for emitting IT, the switching must be done during the kicking operation, and there is a problem in that the track may be lost during switching, making it easy to cause kicking 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 can stably switch beams for detecting kicking motions and tracking signals.

The above object of the present invention is to provide an optical information recording medium in which information is recorded by scanning a light beam along a plurality of tracking tracks formed parallel to each other.
between the tracking tracks, a first area that is equidistant from the tracking tracks on both sides and parallel to each tracking track; and a first area that is closer to either of the tracking tracks than the first area; The coupling is achieved by providing an auxiliary track having a second region parallel to the tracking track, and a third region connecting the first region and the second region and forming a predetermined angle with the tracking track. .

〔Example〕

FIG. 2 is a schematic plan view of an optical card to which the present invention is applied. In the figure, a clock track 21.2m + 28 + . 31t3! p...
... are arranged alternately at equal intervals. And a recording section 41 t for recording information on each open truck can.
4 snow s4s +... are provided.

That is, the optical card 1 has a recording section in the entire area between the clock track and the tracking track. FIGS. 3 and 4 show optical information recording/reproduction for recording and reproducing the optical card of the present invention. FIG. 3 is a perspective view and FIG. 4 is a side cross-sectional view for explaining the configuration of an embodiment of the apparatus. A beam emitted from a light source 11 such as a semiconductor laser is passed through a collimator lens 1
2 and split into three beams by a diffraction grating. These beams are imaged by the objective lens 14 on the original card 1 as shown in FIG. 2, and form beam spots s1*S*Sm, respectively. Here optical card 1
is moved in the direction of arrow R by a driving means (not shown),
The beam spot is scanned in the direction in which the tracking track and the tracking track extend.

The reflected light of the beam sub-al-8s-am passes through the objective lens again, is reflected by the beam-sub-al-8s-15, and is detected by the condensing lens 16 to the photodetector 17 placed on the focal plane.
18 and 19 respectively. These photodetectors are arranged side by side in the two directions shown in the figure as shown in FIG. It is divided into four parts as shown in f).

Next, the operation of recording information on the original card using the above-mentioned device will be explained with reference to FIG. FIG. 6 shows an enlarged view of the recording surface of the original card. When recording information on the recording section 41, the clock tracks 21. Recording section 41, tracking track 3
! irradiate. 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 spot a enters the aforementioned photodetector 171,
A clock signal is regenerated. In addition, the reflected light from the spot S3 enters the photodetector 19, and a tracking signal is detected by the so-called push-pull method.

That is, the light-receiving surface of the photodetector is aligned with A and O with respect to the y-axis direction corresponding to the length direction of the tracking track as shown in FIG.
It is divided into B and D. Therefore, when spot S is shifted from tracking track 3□, A, C and B,
There is a difference in the intensity of light incident on the light receiving surface D, and when the signals from these light receiving surfaces are compared, a tracking signal is obtained by k.

Based on this tracking signal, an unillustrated tracking means (for example, a means for moving the objective lens 14 in two directions in FIG. 3) is activated.
2e 83 are moved together in the direction perpendicular to the scanning direction (direction b) to perform AT. Then, the recording part 4□ is tracked by spot S.

Recording pits 5 are accurately recorded along the line 3□.

Further, in the above recording, the photodetector 19 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 AT. 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 S2 is obliquely incident on the recording surface 211C of the optical card, and the reflected light 22 is reflected when the spot S2 is accurately focused on the recording surface. 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 is vertically shifted from 21' to 21'' with respect to the focal position,
The reflected light becomes non-parallel to the incident light as 22I and 22'', respectively, and the irradiation position moves in the y direction Iζ on the detection surface 23. Therefore, such a change in the light intensity distribution in the y direction is By detecting the output difference between the light-receiving surfaces A, B and O, D of the photodetector 19 placed in the photodetector 19, a focus wave signal is obtained.

In accordance with this focus signal, the objective lens 14 is moved in the optical axis direction to perform AF.

Next, features of the optical information recording medium of the present invention will be explained with reference to FIG. 1(A). FIG. 1(A) is an enlarged view of the right end of the original 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 Fig. 2 and Fig. 6 are given the same reference numerals, and detailed explanations are omitted. When recording information, as shown in Fig. 1 (A), First, the beam spot is tracked at spot S3 while moving in the direction of arrow a, and recorded at spot Sm (the position of the workpiece in the figure). When the beam spot leaves the recording area, it enters kick area B. In the kick region B, an auxiliary track K is provided parallel to the tracking track and separated by a distance X@. Therefore, the beam spot is kicked in the b direction by a distance by a tracking means (for example, a means for moving the objective lens in the Z direction in FIG. 3), and the spot Ss
to track the auxiliary track K (position marked ■ in the diagram)
. The kick zx' at this time is 6 to 1, assuming that the pitch X of the normal tracking track is about 40txn.
The spot Ss then moves on the auxiliary track in the direction of the arrow a and enters the area 0.

In area C, the auxiliary track is tilted by θ1 with respect to the tracking track, and the beam spots 81 to SL move in the direction of arrow a according to the tracking control of spot S1, and in the direction indicated by arrow A,
゛Move that position〇 (position marked ■ in the diagram). here,
The tilt angle θ1 is determined by the relative moving speed V between the beam spot and the optical card, and the response frequency F of the tracking means (for example, when tracking is performed by the advantage of the objective lens, the limit frequency at which the amount of deviation is guaranteed) Then, the critical angle of inclination θ that prevents the shoe from slipping off is θ, , , n
-12Fx+ ■. And θ1 satisfies the relationship θri≦θ°.

Next, the beam spot S3 is guided to E ( (Position of ■ in the figure). At this time, the photodetector F receiving the reflected light from the spot Sl performs AT and AP to spot 83.
The photodetector 17.18.1 described later
The role of the signal processing system from 9 is switched in the area 0 and ζ, and the auxiliary track in E is equipped with spora) 8 as described above.
Since the spot S1 is separated from the tracking track 31 by a distance equal to the distance between the spot S1 and the spot Ss, the spot S1 is located on the tracking track 31, and such a role switching can be performed smoothly.

After this, the beam spot changes its direction of movement to the direction of arrow a1, moves while tracking with the beam spot S2 when it enters area A.
Recording of information is started again at (position V in the figure).

The operation of reproducing the information recorded in this way using the same device will be explained using FIG. 8.

On the recording surface of the optical card, there are clock tracks 21 * 2! as shown in Figure 8. , and tracking track 31,
. . . , an information track 25 consisting of a recording bit string is recorded between . , 252, . . . are formed. Here, at the aforementioned spots 5t-82-8s, information track 251,) racking track 31. Information track 25! is scanned in the direction of arrow a. Then, while the photodetector 18 performs AT and AP, the photodetectors 17 and 19 simultaneously output information on the information tracks 251 and 251. By repeating such operations, information in the entire area of the original card can be read out at twice the recording speed. Although it is not possible to obtain a clock signal from the clock track with this kind of operation, in the case of playback,
Since the clock can be extracted from the signal itself recorded on the information track (so-called self-clock), there is no problem in practical use.

FIG. 1(B) is a diagram illustrating the operation at the time of reproduction in the characteristic part of the present invention described above, and corresponds to an extension of the right side of the optical card on which information has already been recorded as shown in FIG. 8. Incidentally, in the figure, the same reference numerals as in FIG. 8 are used for W1, and detailed explanation thereof will be omitted.

In Fig. 1 (CB), the beam spot moves in the direction of arrow a while tracking with the spot S, and is reproduced at S, S, S (position of the workpiece in the figure).

When the beam spot leaves recording area A, it enters kick area B. Therefore, as in the case of recording, the beam spot is kicked in the direction b by a distance l1llX', and tracking is performed on the auxiliary track with the spot S. (Position of ■ in the diagram).

Next, the beam spot passes through a region C with an inclination angle θ1 (the position of the square in the figure) and enters a region H parallel to the tracking track. In area E, there is an auxiliary track KI parallel to the tracking track and a distance gll
'Kick, spot S, to the auxiliary track #
(position marked ■ in the figure).

Then, the beam spot changes its moving direction to the direction of arrow a1 and enters the area again. Here, the auxiliary track and the illusion are tilted by θ1 with respect to the tracking track, and as expected, θ=
satisfies θ2 × θ'(θ" is the limit angle of inclination).

After that, the beam spot is moved to the area 0. Recording area A through B
When it enters, playback is performed using Subo F s, t 8M.

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

Here, 51 is a switch sw1. Control circuit that controls the opening and closing of sw, 52, 53, 54, 55゜5
6.62,63,64,65e66.69,70171
．． 72 is an addition amplifier, 57, 58, 67.68, 73.
74 is a subtraction amplifier, and 01 to 011 are terminals. In FIG. 6, when recording is performed in the recording area 411, the control circuit 51 connects the switch SW1 to the terminal O1 side and the switch SW2 to the terminal C3 side according to the recording mode. Therefore, the output of the terminal Oti is obtained as the clock signal OL, which is the sum of the outputs of the light-receiving surfaces A, B, O, and D of the photodetector 17 through the adding amplifiers 53, 56, and 52, and the spot signal S is obtained as a reference signal through a processing circuit (not shown). Control recording by Further, the difference between the output sum of the light receiving surfaces A and O of the photodetector 19 and the output sum of B and D of the photodetector 19 is obtained as a tracking signal AT through the terminal 06 through addition amplifiers 63 and 66 and subtraction amplifier 68. This signal AT is supplied from a terminal 06 to a tracking navigation circuit (not shown). Further, the difference between the sum of the outputs of the light receiving surfaces A and B of the photodetector 19 and the sum of the outputs of O and D is sent to the terminal C through the addition amplifier 64°65 and the subtraction amplifier 67 to the focusing signal F.
obtained as n. This signal AP is supplied from terminal C to a focus servo circuit (not shown).

When recording in the recording area 4 snow, the control circuit 51 connects the switch SW1 to the terminal 03 side and the switch SW max to the terminal CT side. Then, do the same thing as in 1 and connect the terminal O! Tracking signal T1 terminal 06I clock signal OL
, 7 ordering signal AP is obtained at terminal 04.

Here, the switching by the control circuit 51 is carried out by, for example, if an address signal for each track is recorded in advance in the recording area, this address signal is read by the photodetector 18, and the control circuit 51 reads out the address signal based on the address signal. 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.

Next, when reproducing information as shown in FIG. 7, the control circuit 51 switches the switch SW1 to the terminal C! in the reproduction mode in response to a mode switching signal from the outside. On the other hand, the switch SW3 is connected to the terminal Cγ side.

Addition amplifier 69.70 and subtraction amplifier 7 are connected to terminal 016.
3, the output sum of the light receiving surfaces A and O of the photodetector 18 and B
, D is obtained as the tracking signal AT. This signal AT is supplied from a terminal 010 to a tracking servo circuit (not shown).

Further, the light receiving image of the photodetector 18 is connected to the terminal 011 through addition amplifiers 71 and 72 and subtraction amplifiers 74.

The difference between the output sum of B and the output sum of O and D is obtained as the 7-ordering signal AP. This signal AP is supplied from a terminal 011 to a 7.4-h servo circuit (not shown). Reproduction signals RF successively output by photodetectors 17 and 19 are taken out from terminals 01 and C6, 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.

〔Effect of the invention〕

As explained above, the present invention provides an auxiliary track between the tracking tracks, which has an area parallel to the tracking track and an area forming a predetermined angle with the tracking track.

It is possible to minimize the amount of kick of the source beam for movement, and it is also possible to make the kick amount the same during recording and playback, which eliminates the problem of AT coil burn-in and eliminates kick errors. It is now possible to perform a stable kicking motion without any bumps.

[Brief explanation of the drawing]

1A and 1B 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. FIG. 7 is a diagram explaining the principle of detection of focusing signals in the device shown in FIG. 3, and FIG. 8 is a diagram explaining how information is reproduced by the device shown in FIG. 3. 9 is a block diagram showing a configuration example of the signal detection circuit in the device shown in FIG. 3, FIG. 10 is a diagram explaining the tilt angle of the auxiliary track and the operation of the tracking means, and FIG. 11 is a block diagram showing an example of the configuration of the signal detection circuit in the device shown in FIG. FIG. 12 is a schematic diagram illustrating the functions of the original card recording and reproducing device, and FIG. 13 is a schematic plan view of the recording surface of the original card illustrating the recording operation of a conventional optical card. 21*21t2m・・・Clock track, 31
t31... To2tsukin/)? Tsuku, 41.4
Goose t41... Recording Department, 251* 25* s
25s t 254...Information track, s,
,s, *SB/song/beam spot 1, KI...
...Auxiliary truck. 4th chart 50th - Te Ahi T

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, a space is placed between the tracking tracks at an equal distance from the tracking tracks on both sides. a first region that is parallel to each tracking track; a second region that is closer to any of the tracking tracks than the first region and parallel to the tracking track; and a second region that is parallel to the tracking track. 1. An optical information recording medium characterized in that an auxiliary track is provided which connects the first area and the second area and has a third area forming a predetermined angle with the tracking track.