JPH02166625A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent multiple recording on a recorded track due to a stray light spot by detecting abnormality in tracking by detecting the fact that a light beam spot locating outside a recording pit is positioned at the recording pit in normal tracking. CONSTITUTION:Signal detectors 24 and 25 are connected to optical sensors 10-1 and 10-3, respectively, and the signal detector 24 outputs a signal (c) when the signal of the recording pit appears in a signal (a), and the signal detector 25 outputs a signal (d) when the signal of the recording pit appears in a signal (b). An OR gate 26 outputs a tracking abnormality detecting signal (e) to a system controller when a level arrives at a high level either the signal (c) or (d). The abnormality of the tracking can be detected by such circuit when AT control is stepped out by shock from the outside or the defect of a recording carrier itself. In such a way, it is possible to prevent the multiple recording from being performed on the recorded track due to the stray light spot.

Description

Detailed Description of the Invention (Industrial Application!l!f) The present invention records information on optical information recording media 3 and 2, and
Optical information recording 11 that reproduces the information recorded on the medium and/or removes the information recorded on the eido body.
)Regarding the main device, especially 51 of auto tracking, new light 'I゛'s ↑+') information in constant detection; C record 1j
Regarding raw equipment.

(Prior art) Near 4B, electric file system using compact disk or write-once disk, optical disk system using eraseable magnetic material, phase change type material, optical information recording + lj raw There are 115 types of equipment, and research and development is active.

Recently, an optical card system that records information on an optical recording medium in the form of a card (hereinafter referred to as an optical card) has been developed, especially γ1: 'l'. It is characterized by being easy to carry and having a larger information capacity than a disk considering its area.

By the way, the recording medium listed in L can be optically detected by scanning the medium surface 1- with a light beam that is modulated according to recorded information and narrowed to a minute spot. Information is recorded as a recording pit row (information track). On this occasion,
without causing troubles such as intersection of information tracks i
F In order to accurately record information, 1) It is necessary to control the irradiation position of the 11th light beam in the same direction as the scanning direction (auto tracking, sometimes referred to as A'1゛). There is.

A conventional tracking signal detection method for such auto-tracking will be described below. .

FIG. 3 is a schematic diagram of an optical information recording device using the tracking (IE!; detection) J method disclosed in Japanese Patent Application Laid-Open No. 62-23933.

In the figure, a light beam emitted from an optical beam 1 such as a semiconductor laser is converted into a linear beam by a collimator lens 2, and is split into three beams by a collimator lens 3. The divided light beams are reflected by the beam splitter 4, focused onto the optical card 6F by the objective lens 5, and formed into three beam spots S1. S2. Form S3. The light beam reflected by the optical card 6 passes through the +Jj and objective lenses 5, passes through the beam splitter 4, and is separated from the incident beam. Then, this reflected beam is reflected by a mirror 7 and is reflected by a mirror 7, and is condensed by a sensor lens 8 and a cylindrical lens 9, and then enters a sensor 10, IO-2, IO-3. Ahead sensor 1 (1-1, 10-2, In-3
is arranged to receive light from the beam spots S1 and S2.33.

The light receiving surface of the two-layer sensor 10-2 is 4 as shown in FIG.
Detection of two silk light-receiving surfaces that are divided and placed opposite each other.
h': "By dividing the sum of J by t7.Z',
1);J1 which was used as an interrogator with the cylindrical lens 9 described in j.
Point aberration; τ is detected, and based on the principle of the known 41-point aberration method,
Obtain the phrase Kashingui No. 11. In addition, when the information is 1'1, +1g raw Shinkyu is obtained from the optical sensor 10-2. In addition, the detection of optical sensor 10-1.10-3 (1j
+j is divided by X, dynamic amplifier 11;
2 is output as a tracking signal S1. This dragging signal ST is fed back to the lens actuator 18 by a circuit not shown, and auto-tracking is performed by moving the objective lens 5 in the eastward direction of the light l+.

The nine card 6 moves backward in the direction of the arrow 1) J by a drive mechanism (not shown), thereby moving the previous spots Sl and S2.
．． S3 scans the optical card. Further, the optical head 19 including the above-mentioned optical system, etc. is mounted in a direction perpendicular to the arrow (■) for track access.

That is, in FIG. 3, it is configured to move in a direction perpendicular to the paper surface.

Figure 5 shows. 6 is a ten-sided view of the l-2 optical card 6. FIG. The optical card 6 is formed by forming a recording layer 20 of a silver salt type, dye type, etc. on a substrate made of a plastic shade.

The recording layer 2 ( ) has a tracking track 2 that can be optically detected due to the difference in P-level unevenness or reflectance.
1 are formed in plural parallel to each other. These tracking tracks 21 are arranged at intervals, and a recording area in which information is recorded is provided between each track.

FIG. 6 is an enlarged view of the recording surface of the optical card 6, illustrating the recording process using the apparatus shown in FIG. A recording area 22 is provided between the tracking tracks 21-1.21-2.21-3.
-1.22-2. Beam spot Sl,
A part of S3 is the tracking track 21-1.2.
So that it takes 1-2! 1!4. The recording area 22-1 is irradiated with the beam spot S2. Here, if the illumination row 1 (1'/1IVi of beam spots 81 to S3 is shifted in the direction perpendicular to the track, the reflected beam from spot S1: 1: and the reflected beam from spot S3: An imbalance occurs between 1 and 1. Therefore, as shown in Figure 3, by detecting the reflected light I: from these spots and subtracting the The beam spot S2 is set between the tracking tracks by performing auto-tracking based on this tracking signal. Guided precisely to the recording area on 1F, 1τ-recording pit 2
3, predetermined information can be recorded. Also,
1. L! When recording information in the recording area 222, beam spots Sl, S2 . S3 respectively on the tracking track 21-2 and the recording area 22-2. It is sufficient to irradiate the tracking track 21-3. Beam spot S1.
The light intensity distribution on the S3 optical card is usually a Gaussian distribution with a high concentration in the center, so if each of these beam spots is made to cover the tracking track by 1', the light due to track deviation: 1 ;Changes are large and tracking errors can be detected with high sensitivity.

(Problem to be solved by the invention) By the way, -1-+iL! When recording or recording information using a device such as 11, Δ'1' control may be lost due to an external attack or a defect in the recording device itself.

In particular, if such a °11 situation occurs during recording, the light spot may stray and cause a lot of damage to the already recorded track.
There was a problem that the data was recorded dry.

(A step to solve the problem in one step) I. In order to solve the above-mentioned problem, the optical information recording I11 generation device of the present invention provides a light beam spot for the information track of the optical information recording medium. 1) record information on the 11 record medium by relatively moving it while tracking and/or flashing; 1) generate the information recorded on the record medium; / or 1j; 1. Optical information recording for erasing 111j recorded on the recording medium 11) In the cattle device, 1iii. Tracking IF
The tracking abnormality is detected by detecting that the recording optical beam spot, which is normally placed 4:1 outside the recording pit, is placed on the recording pit L.

(1) In the configuration of the present invention described in 1, during the tracking 11, an optical beacon and spot for tracking and/or tracking placed outside of the recording base are used to: 1. The light beam spot is 1, L! Since it is possible to detect tracking abnormality by detecting that the recording pit 1 has been placed on recording pit 1, even if the hego control is lost due to an external impact or a defect in the recording pit 1, the f+X5J of the already recorded recording pit can be detected. By detecting this, tracking abnormality can be detected, and the light spot will not stray and record multiple peaks on the already recorded track.

(Embodiments) Please refer to the drawings for embodiments of the present invention. j Explain while using L.

FIG. 1 shows a tracking 5° angle diagram showing an embodiment of the present invention.
FIG. 2 is a schematic diagram of the Ninomiya detection circuit.

In Figure 1, 10-1 and 10-3 are optical sensors that receive the anti-Q-1 light of the tracking river beef 1 spots Sl and S3, as shown in Figures 3 and 4; The detected signal A,1 by this optical sensor is subtracted by a dynamic amplifier 11, and outputted from the end 1'+2 as a tracking track I,i5;S[. This circuit performs normal tracking signal detection.

On the other hand, each of the optical sensors IQ-1 and 10-3 has (+j
-j detection device 24.25 is connected. This Shinkyu detection device i'j 24 detects the recording pit 11 in the Shinjiji a.
When a signal appears, the signal C is output, and the signal detection AI
+2ii'i25, (+T ``i When record pit No. 411 appears in b (:j 'j (outputs 1. 26 is an or gate, Ii 1' + own i1; bow C When either of (1) and (1') reaches a high level, a tracking error signal (7i) is output to a system controller (not shown).

With this circuit, it is possible to detect a tracking abnormality in the case where the delta control goes out of order due to an external attack or a defect in the recording press itself, according to the method described below.

FIGS. 2(Fl) to ([) are explanatory diagrams of the small-4 tracking 5° normal detection circuit in FIG. 1.

Figure 2 (?]) shows ]・Rassing rack 21-1.
2+-2, 2m3, ... and the recording area 22-1, 22- provided between these racks 1-rack.
2, . . . is a partially enlarged view of the optical card recording area. In this figure, SS3 is i-racking river bee 1
1 spot, and S2i is the 1st Midorikawa beam spot. .

When tracking is abnormal, beam spots 31 and S2
Ha, people! For example, a part of / is the tracking track 21-
1.21-2, recording pits (indicated by black circles in FIG. 2 (?1)) are formed in the recording area 22-1 by the beam spot S2.

FIG. 2(a) shows a situation where recording is being performed in the recording area 22-2. Also, in this figure, the track force directions are XI, X2, X3, etc.
..., and the positions X1X2, X3 .・
The situation of signal a is shown in Fig. 2 (b), the situation of signal S is shown in Fig. 2 (c), and the situation of signal C is shown in Fig. 2 (d).
The situation of signal d is shown in FIG. 2(e), and the situation of signal C is shown in FIG. 2([).

Here, at 1 position X-1, from the outside? ! Suppose that spots 31 to S3 move in the direction due to an impact or a defect in the medium. At this time, as shown in FIG. 2(b), when the spot S1 moves on the track 21-2 (XI to X2), the signal a of the spot S1 decreases and becomes the first one on the track 21-2. It increases when it starts to come off. When the spot S1 moves and contacts the recording pit in the recording area 22-1,
The signal (R) of this recording pit begins to appear in the signal a. At position x3, the spot Sl passes through the center of the recording area 22-1, so the signal of the recording pit appearing in the signal a becomes maximum. Thereafter, as the spot S1 moves, the spot S1 gradually deviates from the "-" recording pit and becomes (a
The signal of the recording pit appearing at number a decreases and disappears completely after passing through x4.

-]J,L<')b does not come into contact with the recorded pits, so no pit signal appears (FIG. 2(C)).

However, when the sports S1 to S3 move in the direction opposite to the Δ direction, the opposite situation described in -1- occurs, and a recording pit signal J appears at the spot S3.

Here, -1, when the spots 31 to S3 move in the direction as described above, if an abnormality of Δ°1" is not detected,
The spot S2 enters the recording area 22-1, and the spot S2 enters the recording area 22-1.
This results in single recording from 2 to 1.

Therefore, the presence of the recording pit G"+"E in the signal a is detected by the A5 error detector 24 at the position Xd. As a result, 4;'', :j c are output.

As shown in 1-, when either signal C or d reaches a high level, tracking abnormality detection signal 0 is output to a system controller (not shown), and the system controller stops modulating the light beam. , double recording to the recording area 22-1 is prevented.

Note that even though the light beam is modulated, (n
The reason why no modulation appears in signal a is because the gain of the amplifier is switched according to modulation a).

The No. 44 detector 24.25 uses a binarization circuit and a litrigal multivibrator, and when the output of the litrigal multivibrator continues for a certain period of time, a signal is sent.
The configuration may be configured so that d is output.

In addition, in the tenth embodiment, S'ia, (r? S'i
Although a signal detector is connected to b, the present invention is not limited to this. Furthermore, a signal detector may be connected to a combination of signal a and signal l).

Additionally, a sensor 10 is provided for activating tracking.
Although signals of -1 and 10-3 are used, the present invention is not limited to this, and it is also possible to detect tracking IIJ using a focusing spot located on the tracking line.

(Effects of the Invention) As explained above, according to the optical information recording/reproduction device of the present invention, the spot arranged so as not to be located in the recording pit 1- when tracking is normal is located in the recording pit 1-.
By detecting the position of the tracking 51 and performing the tracking 51 detection, it is possible to prevent data destruction due to 21n recording.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a tracking control section according to an embodiment of the present invention. FIGS. 2(a) to 2(f) are diagrams for explaining the operation of the tracking control section shown in FIG. 1. FIG. 3 is a schematic diagram showing an optical information recording device 11# using the conventional tracking detection method. FIG. 4 is a plan view of the light receiving surface of the optical sensor of the recording device shown in FIG. 3. FIG. FIG. 5 is a schematic IL view of the optical card shown in FIG. FIG. 6 is an enlarged view of the recording surface of the nine card shown in FIG. Optical sensor 0-1... Spot 5 O-3... Spot S3 1... Differential amplifier 1... Tracking track 2... Recording area 4... Ir3 detector 6...・Orgate light sensor

Claims (1)

[Claims] (1) Record information on the recording medium by moving a light beam spot relative to the information track of the optical information recording medium while tracking and/or focusing, and reproduce the information recorded on the recording medium. and/or in an optical information recording and reproducing apparatus for erasing information recorded on the recording medium, detecting that the light beam spot, which is located outside the recording pit when the tracking is normal, is located on the recording pit. What is claimed is: 1. An optical information recording device that detects a tracking abnormality.