JPH0675290B2 - Optical disc recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording / reproducing apparatus capable of optically recording, reproducing and erasing information.

2. Description of the Related Art In recent years, in the field of audio equipment, a digital recording / reproducing system using a PCM (pulse code modulation) technique is being adopted in order to achieve reproduction with high fidelity as much as possible. In other words, this is called digital audio conversion, and the principle is that the audio characteristics do not depend on the characteristics of the recording medium and are significantly superior to those of the conventional analog recording / reproducing method. This is because it has been established.

In other words, taking a CD (Compact Disc) type as an example, a pit (unevenness with different reflectance) corresponding to digital (PCM) data is spirally formed in a rotating direction on a transparent resin disk with a diameter of 12 cm and a thickness of 12 mm. Disks coated with a thin metal film forming pits are rotatably driven at a constant linear velocity at a variable rotation speed of about 500 to 200 rpm, which is an optical device incorporating a semiconductor laser and a photoelectric conversion element. A linear pickup is used to reproduce from the inner circumference side to the outer circumference side by a linear pickup, but the disk has a track pitch of 1.6 μm and a radius of 25 to 58 m.
Information can be recorded in the program area of m, radius 23
The index data of the recording program is recorded in the lead-in area of ~ 25mm.

Therefore, conventionally, in the CD type optical disc reproducing apparatus, the recording end time of the recorded contents recorded in the lead-in area of the disc and a part of the recorded contents recorded in the program area are periodically recorded. The remaining time is displayed by displaying both of them by using the reproduction time that is present.

On the other hand, the optical disc recording / playback method that can optically record, play, and erase information is not read-only like the optical disc playback device of the CD method, so that a portion of the recorded content has a periodic playback time. Was not recorded, and it was difficult to record by specifying the location on the disc. Therefore, as a conventional technique, a recording optical disk as disclosed in Japanese Patent Laid-Open No. 61-48145 has been proposed.

Hereinafter, the conventional recording optical disc as described above will be described with reference to the drawings.

FIG. 4 is an explanatory plan view of a conventional recording optical disc. In FIG. 4, 41 is a photosensitive recording optical disk using an organic dye in the recording layer, 42 is a recorded portion, 43 is an unrecorded portion, and M1, M2, M3, M4, M5 are information scales.

The operation of the recording optical disc configured as described above will be described below.

As shown in FIG. 4, the recording optical disc 41 is provided with information scales M1, M2, M3, M4, M5 that should be used as a guide for the amount of recorded information. By the way, when information is optically recorded on the recording optical disc 41, a visual change occurs at the recorded portion. This is the recorded portion 42 which is the shaded portion. In this example, the information scale is in increments of 2000 megabytes, and the information scales M1, M2, M3, M4, and M5 indicate 2000 megabytes, 4000 megabytes, 6000 megabytes, 8000 megabytes, and 10000 megabytes, respectively. Assuming that the total recording capacity of this optical disc 41 is 10,000 megabytes, the recorded information amount is about 3000 megabytes and the unrecorded capacity is about 7,000, according to the positional relationship between the recorded portion 42 and the information scale M1 as shown in FIG.
It can be visually judged that the size is megabyte.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, the recording capacity of the unrecorded portion can be visually recognized by the information scale graduated on the optical disc, Cost increase, inaccuracy for visual judgment, problem that the medium of the recording layer is limited, and
There is a problem that it is not possible to automatically determine the recording capacity of an unrecorded portion, identify each recorded location, and identify an unrecorded location.

The present invention solves the above-mentioned conventional problems by recording the number of tracks required for recording each information signal recorded in a program ellipse of an optical disc in a lead-in ellip in the recording order. By displaying the recording time of each information signal and the recording time of the recorded portion of the program ellipse based on the above, the optical disc does not require a scale and the medium of the recording layer is not limited, and the unrecorded portion The present invention provides an optical disc recording / reproducing apparatus capable of automatically determining the recording capacity, identifying each recorded location and identifying an unrecorded location.

In order to achieve this object, the optical disc recording / reproducing apparatus of the present invention includes a laser light source, an objective lens, and a light receiving unit for an optical disc having a spiral guide track. A tracking error signal that records and reproduces an information signal by tracing with an optical pickup that it has, and that generates a tracking error signal corresponding to the deviation between the optical pickup and the track based on the output signal of the optical pickup. Generating means, tracking servo means for minimizing the tracking error based on the tracking error signal, focus error signal generating means for generating the focus error signal based on the output signal of the optical pickup, and driving the objective lens based on the focus error signal Control and focus The focus servo means for minimizing the error, the tiger base drive for moving the optical pickup in the radial direction of the optical disc, and the information signal recorded on the optical disc in the program area which is a recordable area. A means for recording the number of tracks required for recording each information signal in a lead-in area, which is a predetermined portion of the optical disc in the order of recording and has a predetermined number of tracks, and an optical means for recording the number of tracks recorded in the lead-in area. The first time for reproducing by a pickup and calculating the recording time of each information signal in the program area and the total recording time of the recorded portion based on the number of tracks
And a second calculating means for calculating the remaining time of the unrecorded portion of the program area based on the total number of tracks of the program area and the number of tracks recorded in the lead-in area.
Based on the output of the first detecting means, the display means for displaying the outputs of the first calculating means and the second calculating means, the first detecting means for detecting one rotation of the optical disc, A first counting means for counting the number of tracks traced by the optical pickup by counting the number of revolutions of the optical disc, and an RF based on the recorded information signal based on the output signal of the optical pickup. RF signal generating means for generating a signal, envelope detecting means for generating an envelope signal corresponding to the envelope of the amplitude level of the RF signal, and detection that the signalless portion of the envelope signal extracted by the envelope detecting means is continuous for a predetermined time And a second signal comparing means for determining that the information signal to be recorded is below a predetermined level for a predetermined time. Signal comparing means, memory means for temporarily storing the number of tracks recorded in the lead-in area and the number of tracks traced by the optical pickup, and third calculating means for calculating the number of tracks stored in the memory means. It has a configuration that includes and.

Effect The present invention has the above-described configuration to reproduce the number of tracks recorded in the lead-in area with the optical pickup,
The recording time of the information signal stored in the memory means and recorded based on the number of tracks is obtained by the first arithmetic means, and the unrecorded time is calculated by the second arithmetic means based on the output of the first arithmetic means. The output of the both is displayed on the display means, the optical disc is rotated at a constant linear velocity, and at the time of reproduction, the number of tracks at the beginning of the recorded information signal to be reproduced or at the time of recording, the recorded area of the program area is recorded. The number of tracks hitting the end portion of the portion is calculated by the third calculating means, and the optical pickup is moved by the traverse drive device to the radial position of the optical disc corresponding to the number of tracks smaller than the number of tracks by a predetermined number of tracks. Move it at a high speed, and after moving, turn on both focus servo and tracking servo, and based on the output signal of the optical pickup, R The output of the first signal comparison means for generating the F signal, detecting the envelope signal corresponding to the envelope of the amplitude level of the RF signal, and detecting that the no-signal portion of the envelope signal has continued for a predetermined time,
Simultaneously with the detection, the traverse driving device is stopped to enter the reproduction or recording waiting state, the recording of the information signal is started from the track at the time of recording, and one rotation of the optical disc is detected by the first detecting means. The counting means counts the number of tracks traced by the optical pickup, and the second signal comparing means outputs an output of the counting means each time it determines that the information signal to be recorded is below a predetermined level for a predetermined time. The number of tracks required for recording each information signal is recorded in the lead-in area in the recording order after the recording in the memory.
That is, the recording time of the recorded portion and the remaining time of the unrecorded portion are displayed in the program area from the number of tracks recorded in the lead-in area of the optical disc, and the optical pickup is based on the number of tracks. Move
The playback or recording location can be automatically specified.

Embodiment One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, 1 is an optical disc having a spiral guide track, 2 is an optical pickup having a laser light source for tracing the optical disc 1, an objective lens, and a light receiving portion (neither is shown), Reference numeral 3 denotes a tracking error signal generation circuit for generating a tracking error signal corresponding to the deviation of the optical pickup 2 from the track based on the output signal of the optical pickup 2.
Is a tracking servo circuit that minimizes the deviation between the optical pickup 2 and the track based on the tracking error signal, and 5 is a focus error signal generation circuit that generates a focus error signal based on the output signal of the optical pickup 2. Reference numeral 6 denotes a focus servo circuit that drives and controls the objective lens based on the focus error signal to minimize the focus error. Reference numeral 7 denotes a traverse drive device that moves the optical pickup 2 in the radial direction of the optical disc 1. Reference numeral 8 is an RF signal generation circuit for generating an RF signal based on the recorded information signal based on the output signal of the optical pickup 2, and 9 is envelope detection for generating an envelope signal corresponding to the envelope of the amplitude level of the RF signal. Circuit, 9 is an error signal extracted by the envelope detection circuit 9. No signal portions of the Beropu signal detects that a continuous predetermined time, a first signal comparator circuit for controlling the traverse drive unit according to the detected state.

Reference numeral 11 is a memory for reproducing and recording the number of tracks of each information signal recorded in the program area of the optical disc by the optical pickup 2, 12 is a detection circuit for detecting one rotation of the optical disc 1, 13 Is a counter for counting the number of tracks by counting the number of rotations of the optical disk 1 based on the output of the detection circuit 12, and 14 is the recording time of each recorded information signal or the program area based on the number of tracks. An arithmetic unit that calculates the recording time of the recorded area of the computer, 15 is an arithmetic unit that calculates the remaining time of the unrecorded portion of the program area, based on the total number of tracks in the output program area of the arithmetic unit 14, 16 is an arithmetic unit A display circuit that displays the outputs of 14 and the calculator 15, 17 is a signal comparison circuit that determines that the recorded information signal is below a predetermined level for a predetermined time, and 18 is a memory 1 This is a computing unit that computes the number of tracks stored in 1.

FIG. 2 is a simple flow chart of the main operation of this embodiment.

FIG. 3 is a diagram for explaining the mutual relationship among the detection circuit 12, the counter 13, the memory 11, and the signal comparison circuit 17.

The operation of the optical disc recording / reproducing apparatus configured as described above will be described below with reference to FIGS. 1, 2, and 3.

The optical disc 1 is composed of a lead-in area having a predetermined number of tracks (not shown) and a program area, and the lead-in area has the number of tracks required for recording each information signal recorded in the program area in the order of recording. It is recorded. This is reproduced by the optical pickup 2 and stored in the memory 11 (step 1). Based on this track number, the recording time of each recorded information signal or the recording time of the recorded portion of the program area is calculated. Calculate with 14. Further, based on the output of the arithmetic unit 14 and the total number of tracks in the program area, the arithmetic unit 15 calculates the remaining time of the unrecorded portion of the program area, and the outputs of the arithmetic units 14 and 15 are displayed on the display circuit 16. By doing so, the recorded time before recording and the unrecorded time are displayed (step 2). Next, when the optical disc 1 is rotated at a constant linear velocity for reproduction, the number of tracks required to record the information signal recorded before the information signal to be reproduced is read from the memory 11 by the calculator 18. The total number of tracks or, when recording, the total number of tracks required for the information signal recorded in the program area is read from the memory 11
After the optical pickup 2 is moved at a high speed by the traverse drive device 3 to a position on the optical disc 1 corresponding to the number of tracks which is smaller than the number of tracks summed in 18, the output of the optical pickup 2 A focus error signal generation circuit 5 generates a focus error signal based on the signal, and a focus servo circuit 6 that minimizes the focus error based on the focus error signal.
Is turned on, and a tracking error signal generation circuit 3 generates a tracking error signal corresponding to a deviation between the optical pickup 2 and a track (not shown) on the optical disc 1 based on an output signal of the optical pickup 2. Then, based on this tracking error signal, the tracking servo circuit 4 that minimizes the tracking error is turned on, the reproduction state is started from the position close to the position to be specified on the program area of the optical disc 1, and the optical pickup 2 Based on the output signal, an RF signal corresponding to the information signal recorded by the RF signal generation circuit 8 is generated, an envelope signal corresponding to the amplitude envelope of this RF signal is generated by the envelope detection circuit 9, and this envelope signal The signal comparison circuit 10 determines that the no-signal portion has continued for a predetermined time. And, determined to stop the traverse driving device 3 simultaneously, and playback or recording waiting state (Step 3).

Next, from the state after the end of step 3, the reproduction or recording is started, the detection circuit 12 detects that the optical disc 1 has rotated once, and based on this output, the counter 13 performs the optical reproduction or recording operation. Based on the number of tracks traced by the optical pickup 2 by counting the number of revolutions of the optical disc 1, the arithmetic unit 14 and the arithmetic unit 15 reproduce the reproducing time and the remaining time, or the recording during recording. The time and the remaining time are calculated, and this output is displayed on the display circuit 16 (step 4).

At the time of recording, the signal comparison circuit 17 determines that the information signal being recorded is below a predetermined level for a predetermined time, and at the same time, the output of the counter 13 is written in the memory 11 and the counter 13 is set. Reset and start counting again (Fig. 3).

After the recording is completed, the number of tracks required for recording the newly recorded information signal written in the memory 16 is additionally recorded in the lead-in area (step 5), so that the recording time of the recorded portion of the program area and the unrecorded portion are recorded. The remaining time of can be automatically known by the above method.

The operation of the arithmetic unit 15 in the present embodiment is performed by setting the number of tracks, which is the difference between the number of tracks required to record each information or the total number of tracks in the program area and the number of tracks recorded in the lead-in area. Although it is converted into units, it can also be realized by outputting the difference between the recording time required for recording each information or the total recordable time of the program area and the reproduction or already recorded time which is the output of the calculator 14. .

The number of tracks to be recorded in the lead-in area is the number of tracks required to record each information signal, but the number of tracks at the end of recording each information signal is counted from the beginning of the program area. Can also be realized.

As described above, according to the present invention, the track required for recording each information signal is recorded every time the recording is performed in the program area, which is the recordable area of the information signal, on the determined lead-in area on the optical disc. An optical system that counts the number of tracks, records the number of tracks in the lead-in area after recording, reproduces the number of tracks recorded in this lead-in area, and reacts to the number of tracks smaller than the number of tracks by a predetermined number of tracks. Move the pickup at a high speed and then put it in the playback state.When it detects that no signal continues for a predetermined time, it stops playback of the optical pickup at the same time and puts it in the playback or recording standby state for high-speed and accurate playback or recording. The location can be specified.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical disc recording / reproducing apparatus showing an embodiment of the present invention, FIG. 2 is a simplified flow chart of the main operation of FIG. 1, and FIG. 3 is a detection circuit, counter of FIG. FIG. 4 is a front view of a conventional recording optical disc, in which the memory and the signal comparison circuit are related to each other. 1 ... Optical disc, 2 ... Optical pickup, 3
...... Tracking error signal generation circuit, 4 ...... Tracking servo circuit, 5 ...... Focus error signal generation circuit, 6 ...... Focus servo circuit, 7 ...... Traverse drive device, 8 ...... RF signal generation circuit, 9 ...... Envelope Detection circuit, 10 ... Signal comparison circuit, 11 ... Memory, 12 ... Detection circuit, 13 ... Counter, 14,15 ... Calculator, 16 ... Display circuit, 17 ... Signal comparison circuit, 18 ... Calculator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidemasa Kitagawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-63-26635 (JP, A)

Claims (3)

[Claims] 1. An apparatus for recording or reproducing an information signal by tracing an optical disc having a spiral guide track by an optical pickup having a laser light source, an objective lens, and a light receiving section to trace the guide track. A tracking error signal corresponding to the deviation of the optical pickup from the track is generated based on the output signal of the optical pickup, and the deviation between the optical pickup and the track is generated based on the tracking error signal. And a focus servo means for generating a focus error signal based on the output signal of the optical pickup, and controlling the drive of the objective lens based on the focus error signal to minimize the focus error. And the optical pickup A traverse driving device for moving in a radial direction of the optical disk, on the optical disc, the number of tracks which the information signal is required for recording each information signal in the program area is recordable region of the respective
Means for recording on a lead-in area where a predetermined number of tracks are present, which is a predetermined part of the optical disc, and by reproducing the number of tracks recorded in the lead-in area with the optical pickup, First computing means for calculating the recording time of each information signal and the total recording time of the recorded portion of the program area based on the number of tracks of the recorded portion of the information signal in the program area; Based on the total number of tracks and the total number of tracks in the recorded area in the program area, which is the sum of the number of tracks recorded in the lead-in area, the remaining time of the unrecorded area in the program area is calculated. Second calculating means for calculating, and the first
Display means for displaying the output of the computing means and the output of the second computing means, first detecting means for detecting one rotation of the optical disc, and output of the first detecting means, Counting means for counting the number of tracks on the optical disc traced by the optical pickup by counting the number of rotations of the optical disc,
Based on the output signal of the optical pickup, an RF signal generating means for generating an RF signal based on the recorded information signal, and an envelope detecting means for generating an envelope signal corresponding to the envelope of the amplitude level of the RF signal. First signal comparing means for detecting that the no-signal portion of the envelope signal taken out by the envelope detecting means has continued for a predetermined time, and determining that the information signal to be recorded is below a predetermined level for a predetermined time Second signal comparing means, memory means for temporarily storing the number of tracks recorded in the lead-in area and the number of tracks traced by the optical pickup, and the tracks stored in the memory means. An optical disc recording / reproducing device comprising a third arithmetic means for calculating the number. Apparatus. 2. An optical pickup is moved in a radial direction of an optical disc rotating at a constant linear velocity,
The information signal is spirally recorded, the counting means counts the number of tracks traced by the optical pickup, and the second signal comparing means continuously records the information signal at a predetermined level or lower for a predetermined time. Then, the output of the counting means at this time is stored in the memory means, and the number of tracks required for recording each information signal stored in the memory means is recorded in the lead-in area in the recording order after the recording is completed. The optical disc recording / reproducing apparatus according to claim 1, wherein 3. When reproducing an information signal recorded in a program area of an optical disc or recording an information signal in the program area, the optical disc is rotated at a constant linear velocity. The number of tracks recorded in the lead-in area is reproduced, and this is stored in the memory by the memory means. Based on the number of tracks stored in the memory, at the time of reproduction, the number of tracks corresponding to the head portion of the information signal to be reproduced or At the time of recording, the number of tracks corresponding to the last part of the recorded portion of the program area is obtained by the third calculating means, and traverses to a position in the radial direction of the optical disc corresponding to the number of tracks smaller than the number of tracks by a predetermined number of tracks. The optical pickup is moved at a high speed by a driving device, and after the movement,
Both the focus servo and the tracking servo are turned on, and the second signal comparing means detects that the no-signal portion of the recorded information signal continues for a predetermined time, and at the same time, the traverse driving device is stopped to reproduce or record. The optical disc recording / reproducing apparatus according to claim 1, wherein the optical disc recording / reproducing apparatus is placed in a waiting state.