JPH0845078A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable verification at the same time as recording, to enable bidirectional recording with verification for recording and veryfying information in an outward course and a backward course of an information recording medium and then to drastically increase recording speed of information. CONSTITUTION:At least two minute spots S1 and S3 are disposed to get a recording minute spot S2 between them, whereas auto-tracking is performed by one of these minute spots S1 and S3, and auto-focusing is performed by the recording minute spot S2 or the auto-tracking minute spot (S1 or S3). Then, simultaneously with the information recording by the recording minute spot S2, the verification is carried out by one of the two minute spots S1 and S3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optical information for recording information on an optical information recording medium, reproducing the information recorded on the recording medium and / or erasing the information recorded on the recording medium. The present invention relates to a recording / reproducing device.

[0002]

2. Description of the Related Art Heretofore, various types of information recording media such as discs, cards, tapes, etc. have been known as information recording media for recording and reproducing information using light. Some of these optical information recording media are recordable and reproducible, and only reproducible. Recording of information on a recordable medium is performed by scanning an information track with a light beam that is modulated according to the record information and focused into a minute spot, and the information is recorded as an optically detectable information bit string. .

Information is reproduced from a recording medium by scanning an information bit string of an information track with an optical beam spot having a constant power such that recording is not performed on the medium and reflecting or transmitting light from the medium. Is detected.

The above-mentioned optical head used for recording and reproducing information on the recording medium is movable relative to the recording medium in the information track direction and in the direction transverse to the direction, and by this movement, the optical head is moved. Information track scanning of the beam spot is performed. An objective lens, for example, is used as a lens for narrowing the light beam spot in the optical head. The objective lens can be independently moved in its optical axis direction (focusing direction) and in a direction (tracking direction) orthogonal to both the optical axis direction and the information track direction of the recording medium. Held in. Such holding of the objective lens is generally performed through an elastic member, and the movement of the objective lens in the above two directions is generally driven by an actuator utilizing magnetic interaction.

Among the above-mentioned optical information recording media, a card-shaped optical information recording medium (hereinafter referred to as an optical card) is a small-sized, light-weight, convenient-to-carry, relatively large-capacity information recording medium, which will be large in the future. Demand is expected.

FIG. 11 is a schematic plan view of a write-once optical card,
FIG. 12 shows a partially enlarged view thereof.

In FIG. 11, a large number of information tracks 2 are arranged in parallel on the information recording surface of the optical card 1 in the LF direction. The information recording surface of the optical card 1 is provided with a home position 3 which serves as a reference position for accessing the information track 2. The information track 2 is in the order of 2-1, 2-2, 2-3, from the side closer to the home position 3.
, Are arranged, and as shown in FIG. 11, the tracking tracks 4 are adjacent to these information tracks 4-1 and 4
They are sequentially provided such as -2, 4-3, .... These tracking tracks 4 are used as guides for auto-tracking (hereinafter, referred to as AT) that controls the beam spot so that the beam spot does not deviate from a predetermined information track at the time of scanning the light beam spot during information recording / reproduction. .

This AT servo detects the deviation (AT error) of the light beam spot from the information track in the optical head, negatively feeds back the detection signal to the tracking actuator, and the objective lens is attached to the optical head main body. This is performed by moving in the tracking direction (D direction) and causing the light beam spot to follow a desired information track.

Further, during information recording / reproduction, when scanning an information track with a light beam spot, in order to make the light beam into a spot shape (focus) of an appropriate size on the optical card surface, Focusing (hereinafter referred to as AF) servo is performed. This AF servo detects a deviation (AF error) from the focused state of the light beam spot in the optical head, negatively feeds back the detection signal to the focusing actuator, and moves the objective lens to the optical head main body in the focusing direction. By moving the light beam spot to the optical card surface to focus the light beam spot on the optical card surface.

Incidentally, in FIG. 12, S ₁ , S ₂ , S ₃
Indicates the light beam spot, AT is performed using the light spots of S ₁ and S ₃ , and A is used using the light spot of S _2.
F and information bits at the time of recording are created and information bits at the time of reproducing are read. In each information track, 6-
Reference numerals 1, 6-2 and 7-1, 7-2 respectively denote a pre-formatted left side address portion and right side address portion, and the information track is identified by reading these address portions. Numeral 5 (corresponding to 5-1 and 5-2 in the figure) is a data part, in which predetermined information is recorded.

Now, the optical information recording method will be described with reference to the schematic view of the optical head optical system shown in FIG.

In FIG. 13, reference numeral 21 denotes a semiconductor laser which is a light source, and in this example, emits light having a wavelength of 830 nm which is polarized in a direction perpendicular to the track. Further, 22 is a collimator lens, 23 is a beam shaping prism, 24 is an aperture, 25 is a diffraction grating for splitting a light beam, 25 'is a diffraction grating portion, and 26 is a polarization beam splitter. Further, 27 is a quarter wavelength plate, 28 is an objective lens, 29 is a spherical lens, 30 is a cylindrical lens, and 31 is a photodetector. The photodetector 31 includes two light receiving elements 31a, 3a.
1c and the light receiving element 31b divided into four.

Further, 408 is an MPU, and 32 is a recording laser driver.

When recording information with the optical head of FIG. 13, a recording laser driver 32 injects a recording level current into the semiconductor laser 21 in accordance with a recording command from the MPU 408.

When reproducing information, the MPU 40
In accordance with a reproduction command from 8, a reproduction laser driver (not shown) injects a reproduction level current into the semiconductor laser 21.

The light beam emitted from the semiconductor laser 21 driven by the current injection becomes a divergent light beam and enters the collimator lens 22. Then, a parallel light beam is formed by the lens, and the beam shaping prism 23
Is shaped into a substantially circular beam. After that, it is incident on the diffraction grating 25, and is split into three effective light beams (0th-order diffracted light and ± 1st-order diffracted light) by the diffraction grating 25. These three light beams enter the polarization beam splitter 26 as P-polarized light beams.

Next, the three light beams are converted into a quarter wave plate 2
It is converted into circularly polarized light when passing through 7, and is focused on the optical card 1 by the objective lens 28. This focused light is converted into three minute beam spots S ₁ (+ _{1st order} diffracted light),
_{They are} S ₂ (0th-order diffracted light) and S ₃ (−1st-order diffracted light). S
₂ is used for recording, reproduction and AF control, and S ₁ and S ₃ are A
Used for T control. Spot position on the optical card 1, as shown in FIG. 12, the light beam spot S _1,
S ₃ is located on the adjacent tracking track 4, and the light beam spot S ₂ is located on the information track 2 between the tracking tracks. Thus, the reflected light from the light beam spot formed on the optical card 1 passes through the objective lens 27 again to be a parallel light beam, and the quarter wavelength plate 2
By passing through 7, the light beam is converted into a light beam whose polarization direction is rotated by 90 ° from that at the time of incidence. Then, it enters the polarization beam splitter 25 as an S-polarized beam.

In the detection optical system, the spherical lens 29 and the cylindrical lens 30 are combined, and the AF control by the astigmatism method is performed by this combination. The three light beams reflected from the optical card 1 are respectively collected by the detection optical system, and as shown in the figure, the photodetector 3
When incident on 1, three light spots are formed. The light receiving element 31a, 31c will receive the reflected light of the foregoing light spot S _1, S _3, using the difference between the outputs of the two light-receiving element A
T control is performed. Further, the four-divided light receiving element 31b receives the reflected light of the light spot S ₂ and uses its output to
The F control is performed and the recorded information is reproduced.

Further, in FIG. 14, 119 is a differential circuit for performing AT control, 117 and 118 are 4 respectively.
An adder circuit for adding the outputs of the photodetectors in the diagonal directions of the split photodetector 31b, 120 is a differential circuit for performing AF control, and 121 is an adder circuit for reproducing recorded information. .

By moving the entire optical head as described above relative to the optical card 1 in the directions of arrows L, F and D in FIG. 11, the information tracks in the recording area can be scanned.

[0021]

[Problems to be solved by the invention]

[Problems A to D] By the way, in an optical information recording / reproducing apparatus which records or reproduces information by reciprocating an information recording medium relative to a light beam like an optical card,
There is always a temporary stop state at the time of reversal during the reciprocating motion of the information recording medium. Therefore, at present, the recording / reproducing speed is inferior as compared with an information recording / reproducing apparatus such as a floppy disk driver which records or reproduces information by rotating the same in one direction. Also,
The verification after recording is indispensable in consideration of the reliability of recording or the countermeasure against error. For this reason, in the past, it was general to record information on the forward path and verify it on the return path for each track, and it was the actual situation that it took twice as long to record the information.

[Objects A to D of the Invention] The present invention has been made in order to solve such a problem, and makes it possible to perform an immediate recording verification in which a verification is performed at the same time as the recording, and further, the forward path of the information recording medium. It is an object of the present invention to provide an optical information recording / reproducing apparatus that enables bidirectional recording and immediate verification in which information is recorded and verified on the return path, and the information recording speed is significantly increased.

[Problem E] Further, in the conventional example, as is apparent from FIGS. 34 and 35, the recording data is recorded in a portion deviated from the center of the information track by Δd. Furthermore, F
The direction of deviation of the recorded data from the center of the information track is different between the case of recording in the L direction and the case of recording in the L direction. When such recorded information is attempted to be reproduced by the light spot S ₂ in the center while AT control is performed by the conventional 1-beam push-pull AT system, for example, data recorded in the direction of arrow F in FIG. When attempting reproduction with the optical spot S ₂ while controlling the AT with the optical spot S ₁ ,
There is a problem that the center of _{2 and} the center of the recorded data are displaced by a maximum of 2Δd, and the reproduction signal level of the data portion is lowered.

[0024]

[Means for Solving the Problems]

[Means A] An object of the present invention is to provide an optical information recording / reproducing apparatus which records or reproduces information by irradiating a plurality of spots on an information recording medium which relatively reciprocates, and reciprocates the recording spots substantially. Of the two spots arranged in the movement direction, AT and AF are performed on the front spot with respect to the relative reciprocal movement direction, and at the rear spot, recording and verification are performed at the same time to perform recording immediate verification and reciprocal recording immediate verification. This is solved by an optical information recording / reproducing device that is enabled.

[Means B] The object of the present invention is to provide a spot for recording in an optical information recording / reproducing apparatus which irradiates a plurality of spots on an information recording medium which relatively reciprocates to record or reproduce information. At least four spots are arranged on a substantially straight line so that the AT is performed at the two outermost spots of the at least four spots for recording, and at least the four spots for recording are recorded. This is solved by an optical information recording / reproducing apparatus that performs verification on a spot which is one of the two spots sandwiched between the spot for AT and the spot for AT and which is behind the spot for recording in the moving direction.

[Means C] Further, an object of the present invention is to provide a spot for recording in an optical information recording / reproducing apparatus which irradiates a plurality of spots on an information recording medium which moves back and forth relatively to record or reproduce information. At least four spots are arranged on a substantially straight line so as to sandwich at least four spots, and at least one of the two outermost spots with respect to the recording spot among the at least four spots is subjected to AT while the at least four spots are arranged. An optical information recording / reproducing apparatus for verifying a recording spot or one of two spots sandwiched between the AT spots and located behind the recording spot in the moving direction. Will be resolved.

[Means D] Another object of the present invention is to provide an optical information recording / reproducing apparatus which irradiates a plurality of spots onto an information recording medium which moves back and forth relatively to record / reproduce information. Of the two AT spots arranged in the approximately reciprocating direction so as to sandwich the AF spot, recording / reproducing with respect to the relative reciprocating movement direction and recording at the AT spot behind the AF spot at the same time. By performing the verification, the optical information recording / reproducing apparatus capable of performing the recording immediate verification and the reciprocal recording immediate verification can be solved.

[Means E] Further, according to the present invention, in an optical information recording / reproducing apparatus which irradiates a plurality of spots on an information recording medium which moves reciprocally relative to each other to record or reproduce information, a minute spot to be recorded is recorded. At least two minute spots are arranged on the two tracking tracks so as to be sandwiched, and one of the at least two minute spots is received by the photodetector having a dividing line parallel to the tracking track. By performing tracking, by shifting the spot center projected on the photodetector of the minute spot for performing the auto-tracking from the dividing line, the recording spot can be arranged at the center of the information track, Two-way recording and immediate verification using the 1-beam push bull AT method That not only allowed the device, reduction of the reproduction signal level, no change can be achieved more stable recording, reproduction and verify capable device.

[0029]

【Example】

[Example A1] Hereinafter, a specific example of the optical information recording / reproducing apparatus of the present invention will be described in detail with reference to the drawings.

The optical head of Example A1 of the optical information recording / reproducing apparatus according to the present invention shown in FIG. 1 is replaced with the diffraction grating 25 shown in FIG. 2 in place of the conventional one shown in FIG. Further, the configuration is such that a verify system is added, and the other components are the same, and therefore the description thereof is omitted here.

As shown in FIG. 1, the verify processing system comprises an MPU 408, a recording laser driver 32, optical head units 21 to 31 and a light receiving processing circuit 33.

That is, the recording laser driver 32 injects a recording level current into the semiconductor laser 21 in accordance with a recording command from the MPU 408.

The light emitted from the semiconductor laser 21 is irradiated onto the optical card to form an information pit. Almost simultaneously with the recording of information, the information pit is scanned with a light spot, the reflected light is received by the photodetector 31, the signal from the photodetector 31 is processed by the light receiving processing circuit 33, and the MPU is used as a verify signal.
Send to 408. MPU408 that received the verify signal
Compares the record information with the verify signal, and if they are the same, it is determined that the recording has been normally completed.

Next, the diffraction grating used in this embodiment will be described.

The diffraction grating 25 used in this embodiment is arranged so that the center of the diffraction grating 25 and the center of the incident light beam 50 coincide with each other as shown in FIG. The diameter of the diffraction grating is made smaller than the incident light beam diameter in order to diffract the light. With this arrangement and configuration,
As shown in FIG. 4, the luminous flux emitted from the diffraction grating 25 is a luminous flux l _{0 having} a diameter D including a non-diffracted component and a zero-order diffracted component, and the luminous flux l ₁ and l ₂ which are ± first-order diffracted luminous fluxes. Is a light beam having a diameter d of only ± 1st-order diffracted components. The relationship of the light flux diameters is D> d.

FIG. 5 and FIG. 6 show each spot arrangement on the optical card. The spot S ₂ is generated by a luminous flux having a luminous flux diameter D, and the spots S ₁ and S ₃ are luminous flux diameters d.
Is generated by the luminous flux. If the spot diameters are S _D and S _d , then S _D <S _d .

In the figure, an arrow F indicates a spot S on the optical card.
It is a direction in which ₁ , S ₂ , S ₃ are relatively moved back and forth,
The spots S ₁ and S ₃ are arranged so as to sandwich the spot S _{2 in the} moving direction.

The spot S ₁ is the track 4-2 and the recording pits 5-2, also spot S ₃ are arranged, respectively, as according to the right above the track 4-3, spots S ₁
The diameter S _{d of} S ₃ and S ₃ may be such that the spot does not reach the recording pit when the spot is placed right above the track.

Further, when the diffraction grating 25 is rotated around the luminous flux axis, the diffraction directions of the ± 1st-order diffracted light change and the degree of engagement with the track also changes. Therefore, if this effect is taken into consideration, an appropriate spot diameter S _d can be determined. Good.

Next, the principle of information recording and verification in the optical information recording / reproducing apparatus of the present invention will be described with reference to FIGS.

The spot S ₂ shown in FIG. 5 is used for recording and reproducing information and AF control. Also, spots S ₁ and S ₃
Is used for verifying recorded information and for AT control.

FIG. 5 is a diagram showing a state during recording of information. The spots S _{1 to} S ₃ are irradiated onto the unrecorded area 2-2,
The recording pit 5-2 is generated by scanning in the arrow F direction. Recording is performed by power-modulating a semiconductor laser, which is a light source, so that the spot S ₂ has a recording power. Also, the spots S ₁ and S during recording
The irradiation light amount of each spot is determined in advance by the diffraction grating 25 so that it is not recorded in ₃ .

Here, AF control is performed by the astigmatism AF method using the signal of the spot S ₂ , and AT control is performed by the 1-beam push-pull AT method using the signal of the spot S ₃ . Since the power is different for each spot during recording and playback, stable AT and AF
In order to perform the above, the gain of each photodetector is switched between recording and reproducing.

As is apparent from FIG. 5, while the AT spot S ₃ is performing AT control, the spot S ₁ arranged rearward with respect to the moving direction of the recording spot is on the pit 5-2 immediately after recording. As a result, the pit generation state immediately after recording can be confirmed. That is, it is possible to verify the recording immediately.

FIG. 6 shows the light in the direction opposite to that of FIG.
It is a diagram showing a recording state when scanning the spot,
Spot S₁ Complete AT immediately while recording at AT
Information is recorded in the unrecorded area 2-1 next to the completed recording area 2-2.
Spot S while recording information ₂ Than the direction of movement
Spot S located behind₃ Verify by
U

Here, each signal processing system, verify signal switching method and AT signal switching method of the present invention will be described with reference to FIGS. 7, 5 and 6.

In FIG. 7, S ₁ , S ₂ , and S ₃ are light spots incident on the respective photodetectors and correspond to the light spots on the optical card shown in FIGS. 5 and 6. 31a is 31a1
And 31a2 are two-division photodetectors, and 31b is 3
A four-division photodetector composed of 1b1, 31b2, 31b3, 31b4, and 31c is a two-division photodetector composed of 31c1, 31c2, and 201, 202, 20.
4, 206 and 208 are addition circuits, and 203 and 20 respectively.
5, 207 are differential circuits, 209 is an AT signal switching circuit, 210 is a verify signal switching circuit, 21
1 is a light spot relative movement direction detector, 408 is an MPU,
213 is a CPU.

First, the case where the recording direction is the arrow F direction as shown in FIG. 5 will be described. As mentioned above, the spot S ₁
Performs verification, spot S ₂ performs AF while performing recording, and spot S ₃ performs AT.

From the light spot relative movement direction detector 211, which generates a High electric signal when the movement direction of the light spot is an arrow F direction in FIG. 5, and a Low electric signal when the movement direction is an arrow L direction in FIG. The signal is sent by the MPU 408 to High.
Receive the h signal. Upon receiving the High signal, the MPU 408 recognizes that the recording direction is the arrow F direction, selects sw2 to the AT signal switching circuit 209, and sends a command to the verify signal switching circuit 210 to select sw3. By the way, AT is performed by the 1-beam push-pull AT method with the 2-split photodetector 31c, and AF is astigmatism AF with the 4-split photodetector 31b.
By law.

As a result, the AF is performed using the light spot S _2.
It is possible to record the information while performing the AT, perform the AT at the light spot S ₃ , and verify the information immediately after the recording at the light spot S ₁ .

Next, in the case of recording information in the direction of arrow L in FIG. 6, the MPU 408 uses the light spot relative movement direction detector 21.
It receives an electric signal of Low from 1 and instructs the AT signal switching circuit 209 to select sw1 and the verify signal switching circuit 210 to select sw4.

As a result, the AF is performed using the light spot S _2.
It is possible to record information while performing the above operation, perform AT at the light spot S ₁ , and verify information immediately after recording at the light spot S ₃ .

As described above, the reciprocal recording immediate verification of the optical card can be achieved by the respective signal processing systems, the verification signal switching method and the AT signal switching method shown in FIG. The reproduction of information is performed by the four photodetectors 31b1, 31b2, 31b3, 31b of the four-division photodetector 31b.
The signal from the adder circuit 206 which is the sum signal of 4 is used.

[Embodiment A2] Another embodiment of the present invention will be described with reference to FIG.

The difference from the above-mentioned embodiment A1 is that AF control is performed by a light spot and a photodetector which perform AT control.

In the figure, 31a 'and 31c' are four-division photodetectors for performing AT, AF and verification, and 31b '.
Is a photodetector for performing reproduction, 301 to 308 and 311 and 314 are adder circuits, and 309 and 310 and 31.
Reference numerals 2 and 313 are differential circuits, 315 is an AT signal switching circuit, 316 is an AF signal switching circuit, and 317 is a verify signal switching circuit.

Similarly to the embodiment A1, the MPU 408, which has received a high electric signal from the light spot relative movement direction detector 211, selects sw2 for the AT signal switching circuit 315 and sw4 for the AF signal switching circuit 316, and verifies. The signal switching circuit 317 is instructed to select sw5. Thus, FIG. 5 in the case of recording the direction of arrow F, the information light spot S ₂ is recorded, subjected to AT and AF each control a light spot S _3, the light spot S ₁
You can verify with. By the way, AT method and AF
The method is the same as in Example A1.

When recording in the direction of the arrow L shown in FIG. 6, the MPU 408 uses the light spot relative movement direction detector 21.
In response to the Low signal from 1, the sw signal is selected to the AT signal switching circuit 315, and the AF signal switching circuit 316 is selected.
To sw3 to the verify signal switching circuit
Command to select 6. Thus, in the case of recording to 6 the arrow L direction, the information light spot S ₂ is recorded, subjected to AT and AF each control a light spot S _1, can verify a light spot S _3. The recorded information is reproduced by the photodetector 31b '.

As described above, similar to the embodiment A1, each signal processing system, the verify signal switching method and the AT / A shown in FIG.
By the F signal switching method, the reciprocal recording and immediate verification of the optical card can be achieved.

[Other Embodiment A] The verification can be performed by selecting the verification spot by switching the moving direction of the spot, but in addition, the AT spots S ₁ and S _{3 (} not shown) can be used. An equivalent signal can be obtained even if the sum signal is used. In this case, the signal processing system can be simplified as compared with the above embodiment.

Further, in the case of normally reproducing the already recorded area, the reciprocal reproduction can be performed by the spot S ₂ .

As described above, in the apparatus for recording or reproducing information by moving the optical card and the spot relative to each other, the reciprocal reproduction and the reciprocal recording immediate verification are possible.

The spots S ₁ and S ₃ for AT and verify may be elliptical spots as shown in FIG. 9 using the diffraction grating 25 of FIG. Also,
Needless to say, even if the spots S ₁ , S ₂ and S ₃ all have the same diameter as shown in FIG.

Further, in the embodiment A1, an example in which information is sequentially recorded in the arrangement direction of the recording areas is shown, but an apparatus capable of random recording may be used, in which case the direction at the start of recording is limited. Without doing so, it has a feature that it is possible to verify the recording immediately from either of the reciprocating movement directions.

Further, in the embodiment A1, a plurality of light beams are generated by the diffraction grating, but the same effect can be obtained by arranging a plurality of light sources without using the diffraction grating.

[Embodiment B1] A specific embodiment of the optical information recording / reproducing apparatus of the present invention will be described in detail below with reference to the drawings.

The optical head of the first embodiment of the optical information recording / reproducing apparatus according to the present invention shown in FIG. 1 has a structure in which a diffraction grating is replaced with that of the conventional one shown in FIG. 13 and a verify system is added. Since the other components are the same, the description thereof is omitted here.

As shown in FIG. 1, the verify processing system is composed of an MPU 408, a recording laser driver 32, optical head sections 21 to 31 and a light receiving processing circuit 33.

That is, the recording laser driver 32 injects a recording level current into the semiconductor laser 21 in accordance with a recording command from the MPU 408.

The light emitted from the semiconductor laser 21 is irradiated onto the optical card to form an information pit. Almost simultaneously with the recording of information, the information pit is scanned with a light spot, the reflected light is received by the photodetector 31, the signal from the photodetector 31 is processed by the light receiving processing circuit 33, and the MPU is used as a verify signal.
Send to 408. MPU408 that received the verify signal
Compares the record information with the verify signal, and if they are the same, it is determined that the recording has been normally completed.

Next, the diffraction grating used in this embodiment will be described.

In the diffraction grating 25 in this embodiment, the film thickness and the grating pitch of the diffraction grating portion are determined so that a total of five luminous fluxes of 0th order diffracted light, ± 1st order diffracted light and ± 2nd order diffracted light can be generated. .

15 and 16 show the arrangement of light spots on the optical card. The light spot S ₃ is the 0th-order diffracted light, the light spots S ₂ and S ₄ are the ± 1st-order diffracted light, and the light spots S ₁ and S
₅ is the ± 2nd order diffracted light. The light spots S ₁ and S ₅ are on tracking tracks 4-2 and 4-3, respectively.

Next, the principle of information recording and verification in the optical information recording / reproducing apparatus of the present invention will be described with reference to FIG.
5 and FIG. 16.

The spot S ₃ shown in FIG. 15 is used for recording and reproducing information and AF control. Further, the light spot S ₂ and S ₄ are for verifying the recorded information, the light spot S ₁ and S
₅ is used for AT control respectively.

FIG. 15 is a diagram showing a state in which information is being recorded. The spots S _{1 to} S ₅ are irradiated onto the unrecorded area 2-2, and scanning is performed in the direction of arrow F to form the recording pit 5-.
Generates 2. Recording is performed by power-modulating a semiconductor laser, which is a light source, so that the spot S ₃ has recording power. In addition, the spot S ₃ during recording
The irradiation light amount of each spot is determined in advance by the diffraction grating 25 so that it is not recorded in other areas.

Here, AF control is performed by the astigmatism AF method using the signal of the spot S ₃ , and AT control is performed by the three-beam AT method using the signals of the spots S ₁ and S ₅ . Since the power of each spot is different during recording and reproduction, the gain of each photodetector is switched between recording and reproduction in order to perform stable AT and AF.

As is apparent from FIG. 15, a spot for AT is used.
To S₁ And S_Five Is a spot for recording while performing AT control
Verifying spots placed rearward with respect to the moving direction of
To S ₂ Will scan on pit 5-2 immediately after recording.
You can check the pit generation immediately after recording.
It That is, it is possible to verify the recording immediately.

FIG. 16 is a diagram showing a recording state when a light spot is scanned in the direction opposite to that of FIG. 15, that is, in the L direction. The unrecorded area 2 next to the recording area 2-2 in which the immediate recording verification is completed. Spot S while recording information on -1
Spot S ₄ arranged behind _{3 in the} moving direction
Verify by.

Here, each signal processing system and the verification signal switching method of the present invention will be described with reference to FIGS. 17, 15, and 16.

In FIG. 17, S _{1 to} S ₅ are the light spots incident on the respective photodetectors and correspond to the light spots on the optical card shown in FIGS. 15 and 16. 31a, 31b,
31d and 31e are non-divided photodetectors, 31c is a 4-division photodetector composed of 31b1, 31b2, 31b3 and 31b4, 401, 402 and 404 are addition circuits respectively, and 403 and 405 are differential circuits respectively. 406
Is a verify signal switching circuit, 407 is a light spot relative movement direction detector, 408 is an MPU, and 409 is a CPU.

First, as shown in FIG. 15, the recording direction is arrow F.
The case of the direction will be described. As described above, the spot S ₂ performs the verification, the spot S ₃ performs the AF control while recording, and the spots S ₁ and S ₅ perform the AT control.

When the moving direction of the light spot with respect to the optical card is, for example, the direction of arrow F in FIG. 15, High, and the arrow L in FIG.
In the case of the direction, the MPU 408 outputs the signal from the light spot relative movement direction detector 407 that generates a Low electric signal to the H level.
Receive the signal of high. Upon receiving the High signal, the MPU 408 recognizes that the recording direction is the arrow F direction, and sends a command to the verify signal switching circuit 406 to select sw1. Incidentally, AT is a 3-beam A that uses the output difference signals of the photodetectors 31a and 31c.
AF is performed by the T method, and AF is performed by the astigmatism AF method by the four-division photodetector 31c.

As a result, the AF is performed using the light spot S _3.
It is possible to record the information while performing the AT, perform the AT with the light spots S ₁ and S ₅ , and verify the information immediately after the recording with the light spot S ₂ .

Next, in the case of recording information in the direction of arrow L in FIG. 16, the MPU 408 uses the optical spot relative movement direction detector 4
Upon receiving the electrical signal of Low from 07, the verify signal switching circuit 406 is instructed to select sw2.

As a result, the AF is performed using the light spot S _3.
While recording information, the optical spot S ₁ ,
AT can be performed at S ₅ , and information just after recording can be verified at the light spot S ₄ .

As described above, the reciprocal recording and immediate verification of the optical card can be achieved by the respective signal processing systems and the verification signal switching method shown in FIG. The reproduction of information is performed by the four photodetectors 31b1 of the four-division photodetector 31c.
The signal from the adder circuit 404, which is the sum signal of 31b2, 31b3, and 31b4, is used.

[Embodiment B2] Next, another embodiment of the present invention will be described with reference to FIG.

The difference from the above-mentioned embodiment B1 is that AF control is performed by a light spot and a photodetector for verifying.

In the figure, 31b 'is a four-division photodetector for AF and verification, 31c' is a photodetector for reproduction, 501, 502, and 504 are addition circuits, 5
Reference numerals 03 and 405 are differential circuits, and 406 is a verify signal switching circuit. As in the first embodiment, the MPU 408 that has received the High electric signal from the light spot relative movement direction detector 407 instructs the verify signal switching circuit 406 to select sw1. As a result, when recording in the direction of arrow F in FIG.
Information can be recorded at ₃ , and AT can be controlled by the light spots S ₁ and S ₅ , and verification can be performed while performing AF control at the light spot S ₂ .

Incidentally, the AT method and the AF method are the same as those in the embodiment B1.

When recording is performed in the direction of arrow L shown in FIG. 16, the MPU 408 is the optical spot relative movement direction detector 40.
Upon receiving the Low signal from 7, the verify signal switching circuit is instructed to select sw2. As a result, when recording in the direction of arrow L in FIG.
Information was recorded at _3, AT in the light spot S ₁ and S ₅
AF can be performed with the light spot S ₂ , and verification can be performed with the light spot S ₄ . The reproduction of the recorded information is performed by the photodetector 31c '.

As described above, similar to the embodiment B1, each signal processing system shown in FIG.
By the AF signal switching method, the reciprocal recording and immediate verification of the optical card can be achieved.

The difference between the embodiment B1 and the embodiment B2 is not only in the signal processing system, but in the embodiment B1, the information of the recording pit at the time of recording is incident on the four-division photodetector 31c for AF control. On the other hand, in Example B2, L in FIG.
In the case of recording in the direction, there is a point that the information of the recording pit at the time of recording does not enter the four-division photodetector 31b 'which performs AF control, and more stable recording can be performed.

[Example B3] The example B2 was further improved.
The signal processing system shown in FIG.
A switching method and an AF / AT signal switching method.
It That is, the light spot S for verifying₂ And S_Four 
AF control is also performed with the AF control and verification.
The signal to be transmitted is detected from the optical spot relative movement direction detector 407
The point is to switch with the signal. Recording in this Example B3
The light spot preceding the spot is S _Four In case of S
_Four AF control with S₂ Verify with
The light spot preceding S₂ In case of S₂ And then A
F control to S_Four Verify with.

In Example B3, Example B1 and Example B2
This makes it possible to perform more stable AF control.

The verify is the moving direction of the spot.
You can select the verification spot by switching
Can be performed by using the
To S ₂ And S_Four Even if the sum signal of
It In this case, the signal processing system is simplified as compared with the above-described embodiment.
it can.

Further, when reproducing the already recorded area normally, the reciprocal reproduction can be performed by the spot S ₃ .

As described above, in the apparatus for recording or reproducing information by relatively moving the optical card and the spot back and forth, the reciprocal reproduction and the reciprocal recording immediate verification are possible.

Further, in the embodiment, the example in which the information is sequentially recorded in the arrangement direction of the recording area is shown, but an apparatus capable of random recording may be used, in which case the direction at the start of recording is limited. Without this, it is possible to verify the recording immediately from either of the reciprocating movement directions.

Further, although a plurality of light beams are generated by the diffraction grating in the embodiment, the same effect can be obtained by arranging a plurality of light sources as a light source without using the diffraction grating.

[Embodiment C1] A concrete embodiment of the optical information recording / reproducing apparatus of the present invention will be described below in detail with reference to the drawings.

The optical head of Example C1 of the optical information recording / reproducing apparatus according to the present invention shown in FIG. 1 has a structure in which a diffraction grating is replaced with that of the conventional head shown in FIG. 13 and a verify system is added. Other than these, the description is omitted here since they are the same.

As shown in FIG. 1, the verify processing system is composed of an MPU 408, a recording laser driver 32, optical head units 21 to 31 and a light receiving processing circuit 33.

That is, the recording laser driver 32 injects a recording level current into the semiconductor laser 21 in accordance with a recording command from the MPU 408.

The light emitted from the semiconductor laser 21 is applied to the optical card to form an information pit. Almost simultaneously with the recording of information, the information pit is scanned with a light spot, the reflected light is received by the photodetector 31, the signal from the photodetector 31 is processed by the light receiving processing circuit 33, and the MPU is used as a verify signal.
Send to 408. MPU408 that received the verify signal
Compares the record information with the verify signal, and if they are the same, it is determined that the recording has been normally completed.

Next, the diffraction grating used in this embodiment will be described.

In the diffraction grating 25 in this embodiment, the film thickness and the grating pitch of the diffraction grating portion are determined so that a total of five light fluxes of 0th order diffracted light, ± 1st order diffracted light and ± 2nd order diffracted light can be generated. .

36 and 37 show the arrangement of the respective light spots on the optical card. The light spot S ₃ is the 0th-order diffracted light, the light spots S ₂ and S ₄ are the ± 1st-order diffracted light, and the light spots S ₁ and S
₅ is the ± 2nd order diffracted light. The light spot S ₁ or S ₅ is projected right above the tracking track.

Next, the principle of information recording and verification in the optical information recording / reproducing apparatus of the present invention will be described with reference to FIG.
6 and FIG. 37.

The light spot S ₃ shown in FIG. 36 is used for recording and reproducing information and AF control. Also, the light spot S ₂
And S ₄ are used for verifying recorded information, and the light spots S ₁ and S ₅ are used for AT control.

FIG. 36 is a diagram showing a state in which information is being recorded. The spots S _{1 to} S ₅ are applied to the unrecorded area 2-2, and scanning is performed in the direction of arrow F to form the recording pit 5-.
Generates 2. Recording is performed by power-modulating a semiconductor laser, which is a light source, so that the spot S ₃ has recording power. In addition, the spot S ₃ during recording
The irradiation light amount of each spot is determined in advance by the diffraction grating 25 so that it is not recorded in other areas.

Here, AF control is performed by the astigmatism AF method using the signal of the spot S ₃ , and AT control is performed by the one-beam push-pull AT method using the signal of the spot S ₁ or S ₅ . Since the power of each spot is different during recording and playback, stable AT
In order to perform AF and AF, the gain of each photodetector is switched between recording and reproduction.

As is apparent from FIG. 36, the AT spot S ₅ is subjected to AT control, and the verify spot S ₂ arranged rearward with respect to the moving direction of the recording spot.
Scans on the pit 5-2 immediately after recording, and the generation state of the pit immediately after recording can be confirmed. That is, it is possible to verify the recording immediately.

FIG. 37 is a diagram showing a recording state when a light spot is scanned in the direction opposite to that of FIG. 36, that is, in the L direction. The unrecorded area 2 next to the recording area 2-2 in which the immediate recording verification is completed. Spot S while recording information on -1
Spot S ₄ arranged behind _{3 in the} moving direction
Verify by.

Here, each signal processing system, the verify signal switching method and the AT signal switching method of the present invention will be described with reference to FIGS. 36, 37 and 38.

In FIG. 38, S _{1 to} S ₅ are light spots incident on the respective photodetectors and correspond to the light spots on the optical card shown in FIGS. 36 and 37. 31a and 31e are two-division photodetectors, and 31c is 31b1, 31b2, 31b.
3 and 31b4 is a 4-division photodetector, and 31b and 31d are non-division photodetectors.
02 and 404 are addition circuits, and 403 and 60, respectively.
1, 602 are differential circuits, 603 is an AT signal switching circuit, 406 is a verify signal switching circuit, 40
7 is a light spot relative movement direction detector, 408 is an MPU,
409 is a CPU.

First, as shown in FIG. 37, the recording direction is arrow F.
The case of the direction will be described. As described above, the spot S ₂ performs the verification, the spot S ₃ performs the AF control while recording, and the spot S ₅ performs the AT control.

When the moving direction of the light spot with respect to the optical card is, for example, the direction of arrow F in FIG. 36, it is High, and the arrow L in FIG.
In the case of the direction, the MPU 408 outputs the signal from the light spot relative movement direction detector 407 that generates a Low electric signal to the H level.
Receive the signal of high. Upon receiving the High signal, the MPU 408 recognizes that the recording direction is the arrow F direction, selects sw2 in the AT signal switching circuit, and sends a command to the verify signal switching circuit 406 to select sw3. By the way, AT is a 1-beam push-pull AT that uses the output difference signal of the 2-split photodetector 31e.
AF is performed by the astigmatism AF method using the four-division photodetector 31c.

As a result, the AF is performed using the light spot S _3.
It is possible to record information while performing the above operation, perform AT at the light spot S ₅ , and verify information immediately after recording at the light spot S ₂ .

Next, in the case of recording information in the direction of arrow L in FIG. 37, the MPU 408 uses the light spot relative movement direction detector 4
The low electric signal from 07 is received, the AT signal switching circuit 603 selects sw1, and the verify signal switching circuit 406 is instructed to select sw4.

As a result, AF is performed using the light spot S _3.
It is possible to record information while performing the above operation, perform AT at the light spot S ₁ , and verify information immediately after recording at the light spot S ₄ .

As described above, the reciprocal recording and immediate verification of the optical card can be achieved by the respective signal processing systems, the verification signal switching method and the AT signal switching method shown in FIG. The reproduction of information is carried out by the four-division photodetector 31c
Four photodetectors 31b1, 31b2, 31b3, 31
This is performed by the signal from the adder circuit 404 which is the sum signal of b4.

[Embodiment C2] Next, another embodiment of the present invention will be described with reference to FIG.

The difference from the above-described embodiment C1 is that AF control is performed by a light spot and a photodetector for verifying.

In the figure, 31b 'is a four-division photodetector for AF and verification, 31c' is a photodetector for reproduction, 501, 502, and 504 are addition circuits, and 6
01 and 602 and 503 are differential circuits, 603 is an AT signal switching circuit, and 406 is a verify signal switching circuit. As in the first embodiment, the MP receiving the electrical signal of High from the light spot relative movement direction detector 407
The U 408 selects AT2 in the AT signal switching circuit 603 and instructs the verify signal switching circuit 406 to select sw3. Thus, in the case of recording to Figure 36 the direction of arrow F, the information in the light spot S ₃ records performs AT control by the light spot S _5, the optical spot S ₂ can verify while performing AF control.

Incidentally, the AT system and the AF system are the same as those of the embodiment C1.

When recording in the direction of the arrow L shown in FIG. 37, the MPU 408 is the optical spot relative movement direction detector 40.
In response to the Low signal from 7, the AT signal switching circuit 603 is instructed to select sw1 and the verify signal switching circuit to select sw4. Thus, in the case of recording to Figure 37 the direction of arrow L, the information in the light spot S ₃ records, the AT with the light spot S _1, the light spot S ₂
AF can be performed with and the verification can be performed with the light spot S ₄ . The recorded information is reproduced by the photodetector 31.
c '.

As in the embodiment C1, the reciprocal recording and immediate verification of the optical card can be achieved by the respective signal processing systems, the verification signal switching method and the AT signal switching method shown in FIG.

The difference between the embodiment C1 and the embodiment C2 is not only in the signal processing system, but in the embodiment C1 the information of the recording pit at the time of recording is incident on the four-division photodetector 31c for AF control. On the other hand, in Example C2, L in FIG.
In the case of recording in the direction, there is a point that the information of the recording pit at the time of recording does not enter the four-division photodetector 31b 'which performs AF control, and more stable recording can be performed.

[Embodiment C3] The signal processing systems, verify signal switching method, and AF signal switching method shown in FIG. 21 are further improvements of the embodiment C2. That is, AF control is also performed by the light spots S ₂ and S ₄ to be verified, and the signal to perform the AF control and verification is switched by the signal from the light spot relative moving direction detector 407. The AF control in S ₄ when the preceding light spot than this example C3 the recording spot of S _4, performs verification in S _2, when the preceding light spot than the recording spot of S ₂ is S ₂ AF control with S
Verify with ₄ .

In Example C3, Example C1 and Example C2
This makes it possible to perform more stable AF control.

Further, from the signal processing systems shown in FIG. 22, the same effects as in the above embodiment can be obtained even with each signal switching circuit.

In the case of FIG. 22, a light spot for AT control is received by a four-division photodetector, and AF control similar to that in the above embodiment is performed.

When recording in the direction of arrow F in FIG. 36, the MPU 408 causes the verify signal switching circuit 406 to sw3.
Is selected, the AT signal switching circuit 603 selects sw2, and the AF signal switching circuit 508 instructs sw6 to be selected. When recording in the direction of arrow L in FIG. 37, the verify signal switching circuit 406 selects sw4 and the AT signal switching circuit 603 selects sw1.
The F signal switching circuit 508 selects sw5.

The verify is the moving direction of the spot.
You can select the verification spot by switching
Can be performed by using the
To S ₂ And S_Four Even if the sum signal of
It In this case, the signal processing system is simplified as compared with the above-described embodiment.
it can.

When the already recorded area is normally reproduced, reciprocal reproduction can be performed by the spot S ₃ .

As described above, in the apparatus for recording or reproducing information by moving the optical card and the spot relative to each other, the reciprocal reproduction and the reciprocal recording immediate verification are possible.

Furthermore, in the embodiment, an example in which information is sequentially recorded in the arrangement direction of the recording area is shown, but an apparatus capable of random recording may be used, in which case the direction at the start of recording is limited. Without this, it is possible to verify the recording immediately from either of the reciprocating movement directions.

In the embodiment, a plurality of light beams are generated by the diffraction grating, but the same effect can be obtained by arranging a plurality of light sources as a light source without using the diffraction grating.

[Embodiment D1] A specific embodiment of the optical information recording / reproducing apparatus of the present invention will be described in detail below with reference to the drawings.

The optical head of the embodiment D1 of the optical information recording / reproducing apparatus according to the present invention shown in FIG. 1 is replaced with the diffraction grating 25 shown in FIG. 2 in place of the conventional one shown in FIG. Further, the configuration is such that a verify system is added, and since the other configurations are the same, description thereof is omitted here.

As shown in FIG. 1, the verify processing system is composed of an MPU 408, a recording laser driver 32, optical head units 21 to 31 and a light receiving processing circuit 33.

That is, the recording laser driver 32 injects a recording level current into the semiconductor laser 21 in accordance with a recording command from the MPU 408.

The light emitted from the semiconductor laser 21 is applied to the optical card 1 to form an information pit. Almost simultaneously with the recording of information, the information pit is scanned with a light spot, the reflected light thereof is received by a photodetector 31, the signal from the photodetector 31 is processed by a light receiving processing circuit 33, and MP is used as a verify signal.
Send to U408. MPU40 that received the verify signal
Reference numeral 8 compares the record information with the verify signal, and if they are the same, it is determined that the recording has been normally completed.

Next, the diffraction grating used in this embodiment will be described.

The diffraction grating 25 used in this embodiment is arranged so that the center of the diffraction grating 25 and the center of the incident light beam 50 coincide with each other as shown in FIG. The diameter of the diffraction grating is made smaller than the incident light beam diameter in order to diffract the light. With this arrangement and configuration,
As shown in FIG. 4, the luminous flux emitted from the diffraction grating 25 is a luminous flux l _{0 having} a diameter D including a non-diffracted component and a zero-order diffracted component, and the luminous flux l ₁ and l ₂ which are ± first-order diffracted luminous fluxes. Is a light beam having a diameter d of only ± 1st-order diffracted components. The relationship of the light flux diameters is D> d.

23 and 24 show the spot arrangements on the optical card. The spot S ₂ is generated by a light beam having a light beam diameter D, and the spots S ₁ and S ₃ are generated by a light beam having a light beam diameter d. If the spot diameters are S _D and S _d , then S _D > S _d .

In the figure, an arrow F indicates a spot S on the optical card.
It is a direction in which ₁ , S ₂ , S ₃ are relatively moved back and forth,
The spots S ₁ and S ₃ are arranged so as to sandwich the spot S _{2 in the} moving direction.

The spot S ₁ is located on the track 4-2 and the recording pit 5-2, and the spot S ₃ is located on the track 4-3 and the recording pit 5-3.
The diameter S _d of the spots S ₁ and S ₃ may be a diameter that covers both the track and the recording pit.

Further, when the diffraction grating 25 is rotated around the luminous flux axis, the diffraction directions of the ± 1st-order diffracted lights change, and the degree of engagement with the track also changes. Therefore, if this effect is taken into consideration, an appropriate spot diameter S _d can be determined. Good.

Next, the principle of information recording and verification in the optical information recording / reproducing apparatus of the present invention will be described with reference to FIGS.

The spot S ₂ shown in FIG. 23 is used for recording and reproducing information and AF control. Also, spots S ₁ and S
₃ is used for verifying recorded information and AT control.

FIG. 23 is a diagram showing a state in which information is being recorded. The spots S _{1 to} S ₃ are irradiated on the unrecorded area 2-2, and the recording pit 5 is formed by scanning in the direction of arrow F.
Generates 2. Recording is performed by power-modulating a semiconductor laser, which is a light source, so that the spot S ₂ has a recording power. In addition, the recording spot S ₁
The irradiation light amount of each spot is previously determined by the diffraction grating 25 so that it is not recorded in S ₃ and S ₃ .

Here, AF control is performed by the astigmatism AF method using the signal of the spot S ₂ , and AT control is performed by the 3-beam AT method using the signals of the spots S ₁ and S ₃ . Since the power of each spot is different during recording and reproduction, the gain of each photodetector is switched between recording and reproduction in order to perform stable AT and AF.

As is clear from FIG. 23, the AT spots S ₁ and S ₃ perform AT control, and the AT spot S ₁ arranged rearward with respect to the moving direction of the recording spot.
Scans on the pit 5-2 immediately after recording, and the generation state of the pit immediately after recording can be confirmed. That is, it is possible to verify the recording immediately.

FIG. 24 is a diagram showing a recording state when a light spot is scanned in the direction opposite to that of FIG. 23, that is, in the L direction. The unrecorded area 2 next to the recording area 2-2 in which the verify immediately after recording is completed. Spot S while recording information on -1
Spots S ₃ arranged behind the moving direction of ₂
Verify by.

Here, each signal processing system and the verify signal switching method of the present invention will be described with reference to FIG. The same parts as those in FIG. 14 shown in the conventional example are denoted by the same reference numerals.

S ₁ , S ₂ , and S ₃ are light spots, 31a,
31b and 31c are photodetectors, 117, 118 and 121 are addition circuits, 119 and 120 are differential circuits, 122 is a verify signal switching circuit, 123 is an optical card movement direction detector, 408 is an MPU, and 125 is a CPU. . The detection system and the signal processing system for the AT signal, the AF signal, and the RF signal are the same as those in the conventional example, and the description thereof is omitted here.

As described above, the verification according to the present invention is performed with the AT light spot arranged behind the recording light spot S _{2 in} the recording direction. When the recording direction is changed, it is necessary to switch the AT light spot for verification. The switching method will be described below.

First, the relative movement direction detector for detecting the relative movement direction of each light spot with respect to the optical card and generating an electric signal of High in the direction of FIG. 23F and Low in the direction of FIG. The MPU 408 receives the signal from 123. When the received signal is High, the MPU 408 commands the verify signal switching circuit 122 to select the signal TS1 from the photodetector 31a and sets TS1 as the verify signal.

The signal received by the MPU 408 is L
If it is ow, the verify signal switching circuit 122 is instructed to select the signal TS2 from the photodetector 31c,
TS2 is used as a verify signal.

Two AT photodetectors 31a as described above
And by choosing to receive the signal from 31c,
Even if the recording direction is changed, it is possible to always achieve the verify immediately after recording. [Embodiment D2] The verification can be performed by selecting the verification spot by switching the moving direction of the spot. Alternatively, as shown in FIG. 26, the sum signal of the AT spots S ₁ and S ₃ can be obtained. The same signal can be obtained even if the above is performed. In this case, the signal processing system can be simplified as compared with the above embodiment.

When the already recorded area is reproduced normally, the reciprocal reproduction is performed by the spot S ₂ .

As described above, in an apparatus for recording or reproducing information by relatively reciprocating the optical card and the spot, the reciprocal reproduction and the reciprocal recording immediate verification are possible.

[Other Embodiment D] The spots S ₁ and S ₃ for AT and verify may be elliptical spots as shown in FIG. 27 using the diffraction grating 25 of FIG. Further, as shown in FIG. 28, the spots S ₁ , S ₂ ,
It goes without saying that the same effect can be obtained even if all S ₃ have the same diameter.

Further, in the embodiment D1, the example in which the information is sequentially recorded in the arrangement direction of the recording areas is shown, but an apparatus capable of random recording may be used, in which case the direction at the start of recording is limited. Without doing so, it has a feature that it is possible to verify the recording immediately from either of the reciprocating movement directions.

Further, in the embodiment D1, a plurality of light beams are generated by the diffraction grating, but the same effect can be obtained by arranging a plurality of light sources as a light source without using the diffraction grating.

[Embodiment E1] The present invention is to correct the deviation between the center of recorded data and the center of information track of a recording medium.

FIG. 29 and FIG. 30 show 3 irradiation on the optical card.
It shows the arrangement of two light spots. A (= B)
Indicates the center of the information track. The code is the same as the conventional example.

FIG. 31 shows a two-divided photodetector 62 for receiving the light spot S ₁ or S ₃ for auto-tracking.
And the projected image of the light spot S ₁ or S ₃ incident on the photodetector.

[0172] In FIG. 31, 60 dividing line of the photodetector 62, 61 is the center of the projected image of the light spot S _1, 63 is a light scattering portion by the tracking tracks of the optical spot S _1, the light amount is substantially 0 Become. Such a light spot S ₁
In order to perform the one-beam push-pull AT so that the mutual difference output of the two-division photodetector 62 becomes 0 using the projection image of, the division line 60 is displaced from the center 61 of the projection image as shown in the figure Are provided at different positions, or with respect to the dividing line 60,
It suffices to shift the center 61 of the projected image to make it incident. The same applies when the AT control is performed with the light spot S ₃ .

According to the positional relationship between the two-divided photodetector 62 and the projected image of the light spot received by the photodetector 62, an apparatus using the 1-beam push-pull AT system is as shown in FIGS. 29 and 30. The center A of the information track and the center B (or B ′) of the light spot S ₂ for recording or reproducing can be matched.

[0174] subjected to AT control in FIG. 29 the optical spot S _3, performs recording and AF control by the light spot S _2,
Verification is performed at the light spot S ₁ . Since the recording direction in FIG. 30 is opposite to that in FIG. 29, the roles of the light spots S ₁ and S ₃ are opposite to those in the case of FIG. When reproducing information, since the light spot S ₂ can be scanned directly above the recording data, the highest level without deviation between the center B (or B ′) of the recording data and the center of the light spot S ₂ can be obtained. A reproduction signal can be obtained.

FIG. 39 shows an example of the signal processing system and each control system, but detailed description thereof will be omitted.

As shown in FIGS. 32 and 33, recording is performed with ± 0th-order diffracted light S ₃ , verification is performed with ± 1st-order diffracted lights S ₂ and S ₄ , and 1 beam is obtained with ± 2nd-order diffracted lights S ₁ and S _5. Even when the push-pull AT is performed, it goes without saying that if the AT control is performed with the configuration shown in FIG. 31, the same effect as that of the above-described embodiment can be obtained.

Further, auto-focusing is performed with the minute spots for recording, and the auto-tracking is performed with the minute spots in front of the minute spots for recording during the relative movement among the two minute spots. By performing the verification with the minute spots, it is possible to provide an apparatus which enables the verification immediately after recording similarly to the above-mentioned embodiment.

The verification or the auto-tracking is performed according to the change in the relative movement direction.
It is characterized in that it is performed by a switching circuit that selects one of the two minute spots, and the switching circuit is controlled by the MPU.

Further, the plural light flux generating means is a diffraction grating or a plurality of light source groups arranged, and the diffraction grating diffracts a part of the incident light flux.

Further, the diameter of the minute spot for performing the auto-tracking is larger than the diameter of the minute spot for performing the recording.

[0181]

【The invention's effect】

[Effect A] As described above, in the optical information recording / reproducing apparatus that records and / or reproduces information by relatively moving the optical information recording medium and the light spot, the recording spot is sandwiched. Placed AT
Among the two spots for recording, the spot for AT arranged behind the recording spot with respect to the moving direction scans a part of the recording pit, thereby making it possible to verify the recording immediately. Thereby, speeding up of recording and reproduction and improvement of reliability can be achieved.

[Effect B] Further, as described above, in the optical information recording / reproducing apparatus for recording and / or reproducing information by moving the optical information recording medium and the light spot relatively, recording is performed. The reciprocal recording verification can be performed by sandwiching the light spot to be performed with at least four light spots, and of the at least four light spots, the recording pit is scanned with a light spot behind the light spot to be recorded during movement. . Thereby, speeding up of recording and improvement of reliability can be achieved.

[Effect C] Further, as described above, in the optical information recording / reproducing apparatus for recording and / or reproducing information by moving the optical information recording medium and the light spot relatively, recording is performed. The reciprocal recording verification can be performed by sandwiching the light spot to be performed with at least four light spots, and of the at least four light spots, the recording pit is scanned with a light spot behind the light spot to be recorded during movement. . Thereby, speeding up of recording and improvement of reliability can be achieved.

[Effect D] Further, as described above, in the optical information recording / reproducing apparatus for recording and / or reproducing information by moving the optical information recording medium and the light spot relatively, Of the two spots for AT arranged so as to sandwich the spot, a spot for AT arranged behind the spot for recording in the moving direction causes a part of the recording pit to be scanned, thereby performing the immediate recording verification. Made possible Thereby, speeding up of recording and reproduction and improvement of reliability can be achieved.

[Effect E] Further, as described above, in the optical information recording / reproducing apparatus for recording and / or reproducing information by relatively moving the optical information recording medium and the light spot, recording is performed. Out of the at least two light spots arranged so as to sandwich the light spot to be performed, the two outermost light spots are arranged on the two tracking tracks, and one beam push-pull is performed on either of the two light spots. AT using AT method
A device for controlling, and capable of performing reciprocal recording immediate verification using a stable 1-beam push-pull AT by relatively shifting the center of a light spot received by a 2-split photodetector from a split line. Can be achieved. Further, since the recording or reproducing light spot can be arranged in the middle (center) of the information track, it is possible to achieve a more stable and high-performance recording or reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a diagram showing an optical head unit and a verify system of an optical information recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram showing a relationship between a diffraction grating and an incident light beam according to an embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a diffraction grating and an incident light beam according to an embodiment of the present invention.

FIG. 4 is a diagram showing a relationship between a diffraction grating and an incident / emitted light beam according to an embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a spot and a recording medium according to an embodiment of the present invention.

FIG. 6 is a diagram showing a relationship between a spot and a recording medium according to an embodiment of the present invention.

FIG. 7 is a diagram showing a signal processing and control system in the embodiment of the present invention.

FIG. 8 is a diagram showing a signal processing and control system in the embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 11 is a schematic view of an optical card.

FIG. 12 is a diagram showing a relationship between a spot and an optical card in a conventional example.

FIG. 13 is an optical layout diagram of an optical head unit in a conventional example.

FIG. 14 is a diagram showing a relationship between a photodetector and a spot and a signal processing system of a conventional example.

FIG. 15 is a diagram showing a relationship between a spot and a recording medium according to an example of the present invention.

FIG. 16 is a diagram showing a relationship between a spot and a recording medium according to an example of the present invention.

FIG. 17 is a diagram showing a signal processing and control system in an example of the present invention.

FIG. 18 is a diagram showing a signal processing and control system in the embodiment of the present invention.

FIG. 19 is a diagram showing a signal processing and control system in an example of the present invention.

FIG. 20 is a diagram showing a signal processing and control system in an example of the present invention.

FIG. 21 is a diagram showing a signal processing and control system in the example of the present invention.

FIG. 22 is a diagram showing a signal processing and control system in an example of the present invention.

FIG. 23 is a diagram showing a relationship between a spot and a recording medium according to an example of the present invention.

FIG. 24 is a diagram showing a relationship between a spot and a recording medium according to an example of the present invention.

FIG. 25 is a diagram showing a signal processing and control system in an example of the present invention.

FIG. 26 is a diagram showing a signal processing and control system in an example of the present invention.

FIG. 27 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 28 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 29 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 30 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 31 is a diagram showing a relationship between a photodetector and a spot and a signal processing system.

FIG. 32 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 33 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 34 is a diagram showing a relationship between a spot and a recording medium in a conventional example.

FIG. 35 is a diagram showing a relationship between a spot and a recording medium in a conventional example.

FIG. 36 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 37 is a diagram showing a relationship between a spot and a recording medium according to another embodiment of the present invention.

FIG. 38 is a diagram showing a signal processing and control system in the example of the present invention.

FIG. 39 is a diagram showing a signal processing and control system in the example of the present invention.

[Explanation of symbols]

1 Optical Card 21 Semiconductor Laser 22 Collimator Lens 23 Beam Shaping Prism 24 Aperture 25 Diffraction Grating 25 'Diffraction Grating Part 26 Polarizing Beam Splitter 27 1/4 Wave Plate 28 Objective Lens 29 Spherical Lens 30 Cylindrical Lens 31 Photodetector 32 Recording Laser Driver 33 Light receiving processing circuit 50 Incident light flux S ₁ , S ₃ AT and verify spot S ₂ Recording / reproducing and AF spot 2-1 to 2 Recording area 4-1 to 3 Tracking track 5-1 to 2 Recording pit 210 , 317 Verify signal switching circuit 211 Spot relative movement direction detector 408 MPU

Claims (42)

[Claims] 1. A plurality of light flux generating means, an objective lens which irradiates a plurality of light fluxes generated by the plurality of light flux generating means as a plurality of minute spots on an optical information recording medium, and receives reflected light from the optical information recording medium. With a detector,
In an optical information recording / reproducing apparatus that records and / or reproduces information by relatively moving the plurality of minute spots with respect to the optical information recording medium, at least two microspots are inserted so as to sandwich the minute spots to be recorded. Minute spots are arranged, and auto-tracking is performed by any one of the at least two minute spots, and the minute spot for performing the recording or the minute spot for performing the auto-tracking is used to perform the above-mentioned minute recording. An optical information recording / reproducing apparatus, characterized in that, at the same time as recording information with a spot, verification is performed with any one of the at least two minute spots. 2. In the at least two minute spots, during the relative movement, the auto-tracking and auto-focusing are performed by the minute spots that are in front of the minute spots that perform the recording, and that are behind the minute spots that perform the recording. 2. The optical information recording / reproducing apparatus according to claim 1, wherein the verification is performed with the minute spots. 3. Autofocusing is performed on the minute spots to be recorded, and in the relative movement of the at least two minute spots, the autotracking is performed on the minute spots in front of the minute spots to be recorded, 2. The optical information recording / reproducing apparatus according to claim 1, wherein the verification is performed at the minute spots behind the minute spots for recording. 4. The verifying and the auto-tracking are performed by a switching circuit that selects one of the two minute spots according to a change in the relative movement direction. An optical information recording / reproducing apparatus as described in the item. 5. The optical information recording / reproducing apparatus according to claim 4, wherein the switching circuit is controlled by an MPU. 6. The optical information recording / reproducing apparatus according to claim 1, wherein the plural light flux generating means is a diffraction grating. 7. The optical information recording / reproducing apparatus according to claim 6, wherein the diffraction grating diffracts a part of an incident light beam. 8. The optical information recording / reproducing apparatus according to claim 1, wherein the plural light flux generating means is a plurality of light source groups arranged. 9. The optical information recording / reproducing apparatus according to claim 1, wherein the diameter of the minute spot for performing the auto-tracking is larger than the diameter of the minute spot for performing the recording. 10. A plurality of light flux generating means, an objective lens for irradiating the plurality of light fluxes generated by the plurality of light flux generating means as a plurality of minute spots on an optical information recording medium, and a reflected light from the optical information recording medium. An optical information recording / reproducing apparatus including a detector for recording and / or reproducing information by relatively moving the plurality of minute spots with respect to the optical information recording medium, At least four minute spots are arranged so as to be sandwiched, and at least four of the at least four minute spots are auto-tracked while the two outermost minute spots of the at least four minute spots to be recorded are arranged. Of the micro spots, the micro spots for performing the recording and the auto track By either of the two said minute spot sandwiched minute spot performing grayed, optical information recording and reproducing apparatus characterized by simultaneously verify is performed to record information in the minute spot performing the recording. 11. In the two minute spots to be verified, at the time of the relative movement, autofocusing is performed at the minute spots in front of the minute spots to be recorded, and the minute spots rearward to the minute spots to be recorded. 11. The optical information recording / reproducing apparatus according to claim 10, wherein the verification is performed with a spot. 12. The verifying and auto-focusing are performed by a switching circuit that selects one of two minute spots for which the verifying is performed according to a change in the relative movement direction. Optical information recording and reproducing device. 13. The optical information recording / reproducing apparatus according to claim 12, wherein the switching circuit is controlled by an MPU. 14. The optical information recording / reproducing apparatus according to claim 10, wherein the plural light flux generating means is a diffraction grating. 15. The optical information recording / reproducing apparatus according to claim 14, wherein the diffraction grating diffracts a part of an incident light beam. 16. The optical information recording / reproducing apparatus according to claim 10, wherein the plural light flux generating means is a plurality of light source groups arranged. 17. A plurality of light flux generating means, an objective lens for irradiating the plurality of light fluxes generated by the plurality of light flux generating means as a plurality of minute spots on an optical information recording medium, and a reflected light from the optical information recording medium. An optical information recording / reproducing apparatus including a detector for recording and / or reproducing information by relatively moving the plurality of minute spots with respect to the optical information recording medium, At least four minute spots are arranged so as to be sandwiched, and at least one of the at least four minute spots arranged on the outermost side with respect to the minute spot to be recorded is subjected to auto-tracking, and at least Of the four micro spots, the micro spot for recording and the auto spot The optical information recording and reproducing apparatus characterized by performing the verification at the same time to record information in the minute spot performing the recording by the minute spot sandwiched minute spot to perform racking. 18. At the time of the relative movement, auto-focusing is performed with a minute spot for recording, and auto-tracking is performed with a minute spot arranged on the outermost side in front of the minute spot for recording. 18. The optical information recording / reproducing apparatus according to claim 17, wherein the verification is performed with the micro spots for performing the verification arranged behind the micro spots for performing the verification. 19. A micro-spot located outside of the micro-spot to be recorded for auto-tracking, and a micro-spot located to the front of the micro-spot to be recorded to be verified. 18. The optical information recording / reproducing apparatus according to claim 17, wherein the auto-focusing is performed, and the verification is performed at the verifying micro-spots arranged behind the recording micro-spots. 20. Auto-tracking and auto-focusing are performed on the outermost micro-spots arranged in front of the micro-spots for recording, and the verify is arranged behind the micro-spots for recording. 18. The optical information recording / reproducing apparatus according to claim 17, wherein the verification is performed with a minute spot. 21. The auto-tracking, the auto-focusing, and the verify are performed by a switching circuit that selects a minute spot for performing each of the auto-tracking, the auto-focusing, and the verify in accordance with a change in the relative movement direction. The optical information recording / reproducing apparatus according to any one of claims 17 to 20, characterized in that. 22. The optical information recording / reproducing apparatus according to claim 19, wherein the switching circuit is controlled by an MPU. 23. The optical information recording / reproducing apparatus according to claim 17, wherein the plural light flux generating means is a diffraction grating. 24. The optical information recording / reproducing apparatus according to claim 23, wherein the diffraction grating diffracts a part of an incident light beam. 25. The optical information recording / reproducing apparatus according to claim 19, wherein said plural light flux generating means is a plurality of light source groups arranged. 26. A plurality of light flux generating means, an objective lens for irradiating the plurality of light fluxes generated by the plurality of light flux generating means as a plurality of minute spots on an optical information recording medium, and a reflected light from the optical information recording medium are received. An optical information recording / reproducing apparatus including a detector for recording and / or reproducing information by relatively moving the plurality of minute spots with respect to the optical information recording medium, An optical information recording / reproducing apparatus characterized in that at least two minute spots are arranged so as to be sandwiched, and information is recorded at the minute spots for recording, and at the same time, verification is performed at any one of the at least two minute spots. . 27. The minute spot for recording has an information reproducing and / or auto-focusing function, and the at least two minute spots have an auto-tracking function for recording information at the minute spot for recording. At the same time as performing the auto-tracking with the at least two minute spots,
27. The optical information recording / reproducing apparatus according to claim 26, wherein the verification is performed with any one of the two minute spots. 28. The optical information recording / reproducing apparatus according to claim 26, wherein the verifying is performed by a minute spot arranged behind the minute spot for performing the recording during the relative movement. 29. The optical information recording / reproducing according to claim 26, wherein the verification is performed by a switching circuit that selects one of the two minute spots according to a change in the relative movement direction. apparatus. 30. The optical information recording / reproducing apparatus according to claim 29, wherein the switching circuit is controlled by an MPU. 31. The optical information recording / reproducing apparatus according to claim 26, wherein the plural light flux generating means is a diffraction grating. 32. The optical information recording / reproducing apparatus according to claim 31, wherein the diffraction grating diffracts a part of an incident light beam. 33. The optical information recording / reproducing apparatus according to claim 26, wherein the plurality of light flux generating means is a plurality of light source groups arranged. 34. The optical information recording / reproducing apparatus according to claim 27, wherein the diameters of the two minute spots for performing the auto-tracking are larger than the diameters of the minute spots for performing the recording / reproducing and the auto-focusing. .. 35. An objective lens for irradiating an optical information recording medium having a recording area and a tracking track with a plurality of light flux generating means and a plurality of light fluxes generated by the plurality of light flux generating means as a plurality of minute spots, and the optical information recording medium. And a detector for receiving reflected light from the optical information recording medium, wherein the optical information recording medium reproduces and / or reproduces information by relatively moving the plurality of minute spots with respect to the optical information recording medium. At least two minute spots are arranged so as to sandwich the minute spots for recording, and the outermost two minute spots of the at least two minute spots are set to two.
Auto-tracking is performed by arranging one of the two minute spots by the photodetector having a dividing line parallel to the tracking track. The optical information recording / reproducing apparatus, wherein the center of the spot of the minute spot projected on the photodetector is relatively displaced from the dividing line. 36. Auto-focusing is performed with a minute spot for performing the recording, and the auto-tracking is performed with the minute spot in front of the minute spot for performing the recording during the relative movement among the two minute spots. 36. The optical information recording / reproducing apparatus according to claim 35, wherein verification is performed with the minute spots. 37. The verifying or the auto-tracking is performed by a switching circuit that selects one of the two minute spots according to a change in the relative movement direction.
6. The optical information recording / reproducing device according to item 6. 38. The optical information recording / reproducing apparatus according to claim 37, wherein the switching circuit is controlled by an MPU. 39. The optical information recording / reproducing apparatus according to claim 35, wherein the plural light flux generating means is a diffraction grating. 40. The optical information recording / reproducing apparatus according to claim 39, wherein the diffraction grating diffracts a part of an incident light beam. 41. The optical information recording / reproducing apparatus according to claim 35, wherein the plurality of light flux generating means is a plurality of light source groups arranged. 42. The optical information recording / reproducing apparatus according to claim 35, wherein a diameter of the minute spot for performing the auto-tracking is larger than a diameter of the minute spot for performing the recording.