JPS63183664A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To detect a normally recorded information track or not, and to eliminate read-out of a track having an error and unnecessary retrying at the time of reproduction, by executing an error check of information recorded in an information recording medium, and recording a mark for showing whether an error exists or not. CONSTITUTION:A host control unit 9 is connected to a recording and reproducing device (drive) 19, and between the devices 19, 9, communication, a control, etc., of a data are executed. A card 1 on which a tracking track 5 has been placed at an equal interval is inserted into this device 19. This card 1 is detected by a sensor and fed in the direction L by turning of a motor 14, and by using light emitting and light receiving elements 37, 36, a state of each track of the card 1 is checked. Said each track 5 is executed repeatedly by a movement of an optical pickup 18, and whether an error by a G mark 7 recorded at the time of recording exists or not is checked. Subsequently, a normal recorded track or not is detected by a result of the check, and it becomes unnecessary to execute read-out of a track having an error and unnecessary retrying.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing apparatus, and more particularly to an information recording and reproducing apparatus that performs error checking by reproducing the recorded information after recording information.

[Prior Art] Conventionally, various types of information recording media, such as disk-shaped, card-shaped, tape-shaped, etc., are known for recording information using light and reading recorded information. Among these, card-shaped optical information recording media (hereinafter referred to as optical cards) are expected to be in great demand as small, lightweight, portable, and convenient large-capacity information recording media.

FIG. 16 is a schematic plan view of the optical card, and FIG. 17 is a partially enlarged view thereof.

In FIG. 16, l is an optical card, 2 is an information track,
3 is the home position. Information is recorded on the optical card 1 as an optically detectable recording pit array (information track) by scanning the optical card with a light beam that is modulated according to recorded information and focused on a minute spot. At this time, in order to accurately record and reproduce information without causing problems such as crossover of information tracks 2,
It is necessary to control the irradiation position of the light beam in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT). In addition, in order to stably irradiate a minute spot despite mechanical errors due to bending of the optical card, U4 (auto focusing, hereinafter referred to as AF) is used to control the micro spot in a direction perpendicular to the optical card.
There is a need to. As shown in FIG. 17, between the information tracks 2 (21, 22, . . . ) of the optical card I, a tracking track 5 (51, 5
20...) are provided.

Next, a method of recording and reproducing information on an optical card will be explained.

In Fig. 16, the light beam is initially at home position 3.
The zero-order light beam moving in the direction in the figure, finds the information track 2N to be recorded or reproduced, scans the information track 2N in the direction F in the figure, and records or reproduces the information.

Here, as a means for detecting whether it is the target information track or not, as shown in FIG. A method is adopted in which a track number recording area (hereinafter referred to as preformat) 6 is provided, the recorded track number is read, and the contents are inspected to determine whether it is the desired information track or not. The data to be written to (21, 22,...) including the track number is recorded as write data, and to detect the track number, play the information track once and then extract the track number part and use it as the target track number. A method of comparison is adopted.

[Problems to be Solved by the Invention] However, in the above method, since no information is written on an unrecorded track during recording, it is impossible to determine whether it is a target information track or not. , If you end up following a recorded information track due to some mistake,
There was a problem with overwriting.

In addition, when the optical information recording medium is a write-once recording medium that cannot be erased, the recorded data must be immediately reproduced and checked to see if it is the same as the recorded data (hereinafter referred to as "verify"), and as a result 1 If the information is incorrect, a recording method is used in which the information is recorded again on the next information track. However, there is a possibility that an error may occur when this information recording medium is reproduced.

If an error occurs, this is due to garbage during playback.

It is impossible to determine whether the problem is due to a scratch or an error that has existed since recording.0 During normal playback, playback is repeated when an error occurs, so-called retries are executed multiple times, and the Sometimes, the operation of reproducing the next information track is repeated, but if there are many error tracks during recording, the number of extra tries increases, resulting in a problem that tflJ becomes longer during reproduction.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an information recording and reproducing apparatus that can avoid overriding and shorten reproduction time.

[Means for solving the problem] The above problem is that after recording information on an information recording medium,
Information according to the present invention, comprising means for reproducing recorded information and performing an error check, and means for recording a mark indicating the presence or absence of an error in a predetermined position of the information recording medium based on the result of the error check. The problem is solved by a recording/playback device.

[Operation] The present invention records an error mark when there is an error in the information recorded on the information recording medium, and/or records a no-error mark when there is no error, so that the information can be recorded normally. This system detects and immediately judges whether or not the information track has been deleted, reduces overrides during recording, and eliminates reading of erroneous information tracks and unnecessary attempts during playback.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that an optical card will be explained as an example of the information recording medium used in the present invention.

First, the basic structure of the optical card and the structure of the optical head section will be explained. In the following description, the same members will be given the same numbers.

FIG. 2 is a schematic diagram of an example of an optical card used in the present invention.

FIG. 3 is a partially enlarged view of section A in FIG. 2.

In both figures, the optical card 1 has a tracking track 5 (51, 52,
) are arranged at equal intervals. A data recording section 4 (41.degree. 42, . . . ) for recording information for each tracking track is provided. That is, the optical card 1 has a data recording section located between each tracking track.

As shown in FIG. 3, tracking tracks 5-1 and 5
A G mark 7 is provided between the mark 1 and the mark 1. This G mark 7 is a mark for identifying a reference track, and is placed at a predetermined location on the optical card by preformatting. On the extension line of the data recording section 40 with the G mark 7, a pattern 8 for medium type identification, which is an auxiliary data section, is recorded and formed by preformatting or optical spots 7. This medium type identification pattern 8 represents the type of optical card, and information such as the modulation/demodulation method, data capacity per track, total number of tracks, etc. is recorded therein.

FIG. 4 is an explanatory diagram of the configuration of the optical head section of the information recording/reproducing apparatus.

FIG. 5 is an explanatory diagram showing a light beam irradiated onto an optical card.

FIG. 6 is an explanatory diagram showing the configuration of a photodetector.

A light beam emitted from a light source 27 such as a semiconductor laser is collimated by a collimator lens 28 and divided into three beams by a diffraction grating 30.

These light beams are directed by an objective lens 26 to a tracking track 51 .
52 and the data recording section 41 to form beam spots St , 32 and S3. Here, the optical card 1 is moved in the direction of arrow R by a driving means (not shown), and is scanned by the beam spot in the direction in which the tracking track extends. Beam spot St
, S2.

The reflected light from S3 passes through the objective lens 26 again.

The light is reflected by the beam splitter 20 and sent to the photodetectors 22 and 23 by the condensing lens system 21.

24 respectively. The condensing lens system 21 is an astigmatism system, and is an example arranged so that autofocusing can be performed using a well-known astigmatism method. These photodetectors are configured in the arrangement shown in FIG. 6, and the photodetector 23 is divided into four sections such as A, B, C, and D.

In FIG. 4, 29 is a prism for converting the cross-sectional distribution of the collimated light beam emitted from the semiconductor laser from an ellipse to a circular shape, and 25 is a mirror that guides the light beam to the objective lens 26.

Next, the operation of recording information on an optical card using the above-mentioned apparatus will be explained with reference to FIG.

First, when recording information in the data recording section 41, beam spots St, S2 . 33 is irradiated onto the tracking track 52, the data recording section 41, and the tracking track 51, respectively. These beam spots are scanned in the direction of arrow F by the movement of the optical card 1 as described above. The reflected light from the beam spot Sl enters the aforementioned photodetector 22, and the reflected light from the beam spot S3 enters the photodetector 24, and a tracking signal is detected by a so-called three-beam method. i.e. Beam Subbot) 31 and S
3 with respect to the tracking track 52.degree. 51, a difference occurs in the intensity of light incident on the photodetectors 22 and 24, and a tracking signal is obtained by comparing the signals from these light receiving surfaces. Based on this tracking signal, a beam spot Sl is determined by a tracking means (not shown) (for example, a means for moving the objective lens 26 in the Z direction in FIG. 4).

52 and 33 are moved together in a direction perpendicular to the scanning direction (second drawing direction), and AT is performed. Then, the recording bits 31 are accurately recorded in the data recording section 41 along the tracking tracks 51 and 52 by the beam subsystem 52.

Next, the information recording/reproducing apparatus of the present invention will be explained.

The information recording and reproducing apparatus of the present invention is characterized in that a special mark indicating the presence or absence of an error is recorded on an extension of the information track after verification.

Special marks that indicate the presence or absence of an error are: a mark (hereinafter referred to as the E mark) is recorded when an error occurs, and a mark (hereinafter referred to as the ■ mark) is recorded when there is no error. , or depending on the presence or absence of an error, E
Marks and V marks may be selected and recorded.

Below, as an example of mark recording, the E mark recording method,
and effects will be explained.

FIG. 7 is an explanatory diagram of the operation of the information recording/reproducing apparatus of the present invention during recording on an optical card.

FIG. 8(A) is an explanatory diagram showing the locus of the light beam spot during recording, the vertical axis represents the speed, and F and L correspond to F and L in FIG. 7.

FIG. 8 CB) is an explanatory diagram showing recording timing, and H
IGH is a non-recording portion, and LOW is a recording portion.

FIG. 9 is a flowchart explaining the operation during recording.
In the figure, the rF force direction indicates the direction of the light spot.

Hereinafter, the recording operation will be explained according to the flowchart in FIG. 9 while referring to FIG. ts7 and FIG. 8.

As shown in FIGS. 7 and 8, when the light spot is at point a, the light spot starts moving at a low speed in the F direction, and
Until the point is reached (by a position detector (not shown) or 1
If the E mark signal does not appear (based on time measurement), start recording, and after recording, set the speed to high speed and the direction to L (point b). If the E mark signal is detected, , moves to the next information track and performs the same operation.

While the light spot is moving in the L direction, the data is reproduced and errors are checked, and when it reaches point C, that is, after all the data has been reproduced, the direction remains the same and the speed is lowered, and when it reaches point d, if there is an error, A predetermined pattern, ie, an E mark, is recorded in the recording area 34 for a predetermined period. If there is no error, recording of the E mark is prohibited by inhibiting the recording control signal (dotted line) in FIG. 8(B).

There is an error. In both cases, e
After passing the point, the light spot is moved from the data recording section 32 to the data recording section 33, and the same operation is repeated for 0 or more,
As described, according to the present invention, data recording, verification, and E mark recording are completed in one round trip on the same information track, so that the recording time can be shortened. In the above description, as shown in FIG. 8(B), the recording speed and the reproduction speed are different, but the effect remains the same even if the speed is the same.

As shown in Fig. 14 (A), the E mark has a single bar-shaped pattern and is basically good. (
C)) is considered an E mark, and even a good track may be recognized as a pad track.

In order to eliminate this drawback, by recording the E mark in a dotted line pattern as shown in FIG. 14(B), it becomes possible to distinguish the signal from the signal shown in FIG. 14(C).

To explain this using FIG. 15, as shown in the same figure, when the E mark is detected by the photodetector 23, the output signal 23-1 of the photodetector 23 has the E mark part as part b, and the dust , parts due to scratches etc. will be counted as 0 copies. Output signal 2
When the signal 3-1 is inputted to a signal processing circuit 1 (not shown), such as a retriggerable monostable multivibrator, an output signal 23-1a shown in FIG. 15 is output. Since the E mark is a dotted line pattern, the pulse width T due to the signal in the C area is
′, the pulse width T due to the signal in the b region becomes larger,
If the pulse width T is greater than a certain value, it is considered as an E mark, thereby eliminating the E mark (Fig. 14 (B)), scratches, and dust (Fig. 14 (B)).
(C)).

Note that the pattern shape and detection method of the ■ mark are also the same as those for the above-mentioned E mark.

When recording as described above, if there is no E mark, there are times when there is no error, but information is recorded, and times when it is not recorded. Although it is difficult to completely prevent overrides, depending on the presence or absence of errors, , E mark and V mark are selected and recorded, it is possible to identify whether there is no error, there is an error, or there is no recording.

During reproduction, the processing is slightly different depending on whether the light spot is at point a or point b at the start of reproduction. When at point a, if a signal due to the E mark is detected before reaching point 0, a track change is made at point b without performing data reproduction processing, and reproduction of the primary information track is executed. On the other hand, when it is at point b, it executes up to the error check and then
When a mark is detected, the track is changed and the next information track is played, regardless of whether there is an error or not. If an error occurs even though the E mark is not detected, the trial is repeated a predetermined number of times.

As a result, when multiple information tracks are played back in succession, even if there is an information track with an E mark (hereinafter referred to as a pad track), there is no need to perform a pad track retry, so the pad Even if there are a large number of tracks, the time required for playback will not be much longer than when there are no pad tracks.

As described above, according to the present invention, recording/reproducing time can be significantly shortened by simply executing simple control.

Note that the same effect can be obtained by using a V mark instead of an E mark.

FIG. 10 is a flowchart illustrating the operation during recording when V marks are used.

7 in the same manner as when using the E mark.

As shown in Figure 8, when the light spot is at point a,
Start moving the light spot in the F direction at a low speed, and if no signal from the V mark appears until the zero point is reached (by a position detector (not shown) or by time measurement), start recording and end recording. After that, the speed is set to high speed and the direction is set to L (point b). If a signal from the ■ mark is detected, the process moves to the next information track and performs the same operation.

While the light spot is moving in the L direction, data is reproduced and errors are checked, and when it reaches point C, that is, after all data has been reproduced, the direction remains the same and the speed is lowered, and when it reaches point d, if there are no errors. A predetermined pattern, ie, a V mark, is recorded in the desired recording area 34 for a predetermined period. If there is an error, the recording control signal shown in Figure 8 (B) is inhibited.
By setting h (dotted line), recording of the V mark is prohibited.

There is an error. In both cases, e
After passing the point, the light spot is moved from the data recording section 32 to the data recording section 33, and the same operation is repeated.

As described above, similarly to the E mark, data recording, verification, and recording of the ■ mark are completed in a round trip of the same information track, so that the recording time can be shortened. In the above description, as shown in FIG. 8 CB), the speeds during recording and reproduction are different, but the effect remains the same even if the speed is the same.

During reproduction, the processing is slightly different depending on whether the light spot is at point a or point b at the start of reproduction. When at point a, if no signal due to the V mark is detected before reaching point 0, a track change is made at point b without performing data reproduction processing, and reproduction of the next information track is executed. On the other hand, when it is at point b, an error check is executed, and if no mark is detected, a track change is made regardless of whether there is an error or not, and reproduction of the next information track is executed. ■If there is an error even though the mark is detected, repeat the trial a predetermined number of times.

As a result, when multiple information tracks are played back consecutively in the same way as with the E mark, even if there is an information track without the ■ mark (hereinafter referred to as a bar two track),
Since there is no need to perform a pad track retry, even if there are a large number of pad tracks, the time required for reproduction is not so long compared to when there are no pad tracks.

As described above, similar to the E mark, recording/reproducing time can be significantly shortened by simply executing vi control.

Next, the configuration of the information recording/reproducing apparatus of the present invention will be explained.

FIG. 1 is a schematic diagram of an embodiment of an information recording/reproducing apparatus according to the present invention.

The information recording/reproducing device (hereinafter referred to as "Tochibu") 19 is connected to the upper control device (hereinafter referred to as "CPU") 9, and the MPU10 in the drive 19 performs data communication, control, etc. between the drive 19 and the CPU 9. has built-in ROM and RAM.

Mainly card feed motor 14 and head feed motor 13) 4
The AT/AF control circuit 11 controls the photodetector 22.2.
3. In response to the signal of 24, the AF actuator l5,
AT actuator 16 is driven. Furthermore, the modulation/demodulation circuit 12 performs recording by changing the light emission intensity of the irradiation optical system 17 during recording, and based on the information from the light detection 323 during reproduction.

Demodulate the data. However, when inserting a card, the medium type identification pattern 8 of the reference track shown in FIG.
0 demodulates and identifies.

Next, FIGS. 1, 2, and 11 show recording and reproducing operations by the information recording and reproducing apparatus.

This will be explained using FIGS. 12 and 13.

FIG. 11(A) is a schematic explanatory diagram of an optical card feeding device, and FIG. 11 CB') is a configuration diagram of the optical card feeding device.

FIG. 12 is an explanatory diagram for determining the home position of the optical card.

FIG. 13 is an explanatory diagram of the reference track detection operation.

When a sensor (not shown) detects that the optical card l has been inserted into the drive 19, the card feed motor 14 is controlled to feed the optical card l in the L direction, and as shown in FIG.
As shown in CB), the optical card l is sent in the L direction by the roller 35.

38 and 39 are rollers that support the optical card.

Using the light emitting element 37 and the light receiving sensor 36, when the tip f of the optical card 1 passes the light receiving sensor 36 as shown in FIG.
When it becomes IGH and the detection hole 40 passes, it becomes LOW at point g,
After passing, it becomes HIGH again at point h. f-g, g-hl! using a position detector (not shown). By measuring the distance or time fi, it is determined whether or not the optical card l has been inserted with force, and if it is correct, the optical card l is further conveyed a predetermined distance and then stopped. This stop position is home position 3.

If it is not correct, the control circuit immediately moves the feed roller 35
The optical card 1 is reversed, the card 1 is ejected, and the operator is prompted to reinsert the optical card 1 using a buzzer, lamp, etc.

Next, an operation is performed to find a reference track (hereinafter referred to as track 00). The operation is as follows: First, when the light spot is at home position 3 due to the above operation, the MPU l
0 drives the head feed motor 13 so that the optical pickup 18 moves in the second @D direction, and as illustrated in FIG. 13, the output 22-1 of the photodetector 22 corresponding to the optical spot Sl is the time of j if nothing is written between the tracking tracks,
If it is written, it will be the time k, so the a control circuit measures the interval at which the optical spot crosses the tracking track and searches for G mark 7, or moves the optical card l to L.
G at a predetermined position for each track while feeding in the
The presence or absence of the mark is inspected to find the G mark 7. When the G mark is detected, the head feed motor 13 is stopped, the optical card is returned to the F direction, then moved to the L direction, and the G mark is again detected. By detecting , it is confirmed that the current information track is track OO.

After detecting the G mark 7, the optical card 1 is sent directly in the L direction (the optical spot is in the F direction), and the MPU 1 O moves to track 0.
The medium type identification pattern 8 (third
(Illustrated). This medium type identification pattern 8 is
The type to which the information recording/reproducing device should be applied is registered in advance in the ROM in the MPUIO, and the MPUIO determines whether the inserted optical card is capable of recording/reproducing.If applicable, the optical card is If it is not possible, send the information "Recording/playback is not possible" to the CPU 9.
Send to PU9.

Also, when applicable, the MPU 10 notifies the CPU 9 that it has become unit ready.

Upon receiving this, the CPU 9 sends a recording or playback command to the MPU.
Send to l0. To explain the reproduction operation again using FIG. 7, when the optical spot is at point a, the optical card 1 is
(that is, the light spot is in the F direction), and it is confirmed whether or not an E mark or a V mark exists before reaching the 0 point, and this is stored. After reaching point C, the data demodulation signal from the modulation/demodulation circuit 12 is stored in the RAM in MPU10, and an error check is executed. - After storing all the data for the information track and executing an error check, check whether there is an E mark or V mark (stored in RAM) on the information track at the time of current playback, and check whether E-f
- If there is no error and there is an error, or if there is a V mark and an error, the card feeding direction is reversed and playback (retry) is performed again. If there is no E mark and no error, or if there is a V mark and no error, a track change is made to prepare for the next playback operation, and the MPU10 transfers the played data to the CPU9. When there is an E mark or when there is no V mark, the track is changed and the next track is played, regardless of whether there is an error or not. Due to the effect of this E mark or ■ mark, even if a playback error occurs, it can be immediately determined whether the cause is due to an error during recording, so there is no need to perform unnecessary trials. Throughput during playback is improved.

[Effects of the Invention] As described in detail above, according to the information recording and reproducing apparatus according to the present invention, by performing an error check on information recorded on an information recording medium and recording a mark indicating the presence or absence of an error, It is possible to detect and immediately judge whether or not an information track has been recorded normally, reducing overrides during recording, and eliminating reading of erroneous information tracks and unnecessary attempts during playback. can. As a result, the reliability of information recording can be improved and the recording and reproducing time can be significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of an information recording/reproducing apparatus according to the present invention. FIG. 2 is a schematic plan view of an example of an optical card used in the present invention. FIG. 3 is a partially enlarged view of section A in FIG. 2. FIG. 4 is an explanatory diagram of the configuration of the optical head section of the information recording/reproducing apparatus. FIG. 5 is an explanatory diagram showing a light beam irradiated onto an optical card. FIG. 6 is an explanatory diagram showing the configuration of a photodetector. FIG. 7 is an explanatory diagram of the operation of the information recording/reproducing apparatus of the present invention when recording onto an optical card. FIG. 8(A) is an explanatory diagram showing the locus of the light beam spot during recording, and FIG. 8(B) is an explanatory diagram showing the recording timing. FIG. 9 is a flowchart illustrating the recording operation when using the E mark. FIG. 10 is a flowchart illustrating the operation during recording when V marks are used. FIG. 11 is a schematic three-sided view of the optical card feeding device. FIG. 12 is an explanatory diagram of the optical card feeding operation. FIG. 13 is an explanatory diagram of the reference track detection operation. Figure US14 is a schematic diagram for explaining the E mark. FIG. 15 is a waveform diagram for explaining the E mark detection operation. FIG. 16 is a schematic plan view of the optical card, and FIG. 17 is a partially enlarged view thereof. l...Φ...Optical card 911...-CPU 10-...@MPU 11...Red...AT/AF control circuit 12...-Modulation/demodulation circuit 13...φ...Head feed motor 14 @...-Card feed motor 15, fist...-AF actuator 16...AT actuator 17, Φ...Irradiation optical system 18...Optical pickup 19...Drive agent Patent Attorney Jo Taira Yamashita Figure 1 Figure 2 Figure 3 -11 → -F Figure 7 L--F Figure 8 System g114B5 Figure 9 Figure 10 Figure 11 (B) Figure 14 (A ) 2 bites in the mouth (B) 20 mouths Figure 15

Claims (2)

[Claims] (1) After recording information on an information recording medium, means for reproducing the recorded information and performing an error check, and determining whether or not there is an error at a predetermined position of the information recording medium based on the result of the error check. 1. An information recording/reproducing device comprising: means for recording a mark indicating a mark. (2) The information recording and reproducing apparatus according to claim 1, wherein the mark is a discontinuous pattern.