JPH0758547B2 - 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 high fidelity reproduction. 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.

That is, 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 1.2 mm. Disks coated with metal thin films formed in parallel are driven to rotate at a variable rotation speed of about 500 to 200 rpm by the CLV (constant linear velocity) method, which is an optical type that incorporates a semiconductor laser and a photoelectric conversion element. Although it is a pickup that plays from the inner circumference side to the outer circumference side in a linear tracking system,
The disc has a track pitch of 1.6 μm,
Information is recorded in the program area with a radius of 25 to 58 mm, and the index data of the recording program is recorded in the lead-in area with a radius of 23 to 25 mm.

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 the playback time and the current playback time. On the other hand, in an optical disc recording / reproducing apparatus capable of optically recording, reproducing, and erasing information, it is not a reproduction-only type like an optical disc reproducing apparatus of a CD system, and therefore a reproduction time is recorded in a part of the recorded content. Therefore, it is difficult to specify the location on the disc for recording. Therefore, in the prior art, for example, a recording optical disk disclosed in Japanese Patent Laid-Open No. 61-4814 has been proposed.

Hereinafter, the conventional recording optical disc 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. If the total recording capacity of this optical disk 41 is 10,000 megabytes, the recorded information scale is about 3000 megabytes and the unrecorded capacity is about 7,000 megabytes from the positional relationship between the recorded portion 42 and the information scale M1 from FIG. It can be visually judged.

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, and automatic recording capacity of unrecorded area cannot be determined. Further, there is a problem that the medium of the recording layer is limited.

The present invention solves the above-mentioned conventional problems by recording the number of tracks of the recorded portion of the program in the lead-in area of the disc and reproducing it to display the recording time of the unrecorded portion. The present invention provides an optical disc recording / reproducing apparatus capable of specifying a recording location without requiring an information scale on the disc and limiting the medium of the recording layer.

Means for Solving the Problems To achieve this object, an optical disc recording / reproducing apparatus of the present invention has a laser light source, an objective lens, and a light receiving unit for an optical disc having a spiral guide track. A device that records or reproduces an information signal by tracing by an optical pickup, and generates a tracking error signal corresponding to a deviation of the optical pickup from the track based on an output signal of the optical pickup, Based on the tracking error signal, a tracking servo unit that corrects a deviation between the optical pickup and the track, and a focus error signal based on an output signal of the optical pickup, and based on the focus error signal. Drive the objective lens to focus Focus servo means for correcting an error, and a lead-in area, which is a predetermined portion where a predetermined number of tracks of the optical disc are present, of a portion recorded in a program area, which is a recordable area of an information signal of the optical disc. A means for recording the number of tracks; and a step of counting the recording time of the recorded portion of the program area based on the number of tracks by reproducing the number of tracks recorded in the lead-in area by the optical pickup. And a second counting means for counting the remaining time of the unrecorded portion of the program area based on the total number of tracks in the program area and the number of tracks recorded in the lead-in area. A display means for displaying the outputs of the first counting means and the second counting means A first signal comparison means for detecting that the tracking error signal reaches a predetermined level, said first
Third counting means for counting the number of tracks traversed by the optical pickup on the basis of the output signal of the signal comparing means, the optical pickup rotating at a constant linear velocity. Information is recorded by moving the optical pickup in the radial direction, and the number of tracks crossed by the optical pickup is counted by the third counting means based on the output signal of the optical pickup. It is configured such that the sum of the number of tracks recorded in the lead-in area before recording is recorded in the lead-in area.

Operation With this configuration, by reproducing the number of tracks of the recorded portion of the program area recorded in the lead-in area of the optical disc, the recording time of the recorded portion and the remaining time of the unrecorded portion can be calculated. By displaying
It is possible to specify the recording location.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. 1 is an optical disc, 2 is an optical pickup, 3 is a focus error signal generation circuit, 4 is a focus servo circuit, 5 is a tracking error signal generation circuit, 6 is a tracking servo circuit, 7 is a counter, 8 is a counter, 9 Is the display circuit, 10
Is a signal comparison circuit, and 11 is a counter.

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

FIG. 3 shows a tracking error signal.

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

First, the optical disc 1 is rotated at CLV (constant linear velocity), and the optical pickup 2 records the lead-in area (not shown) on the optical disc 1 on the optical disc 1 (not shown). The number of tracks in the recorded area of the program area, which is the recordable area of the information signal, is read (step 1), and based on this number of tracks,
The counter 7 counts the recording time of the recorded area of the program area, and based on the output of the counter 7, the counter 8 calculates the difference between the total number of tracks of the program area and the number of the recorded area of the program area, and converts the time unit. Then, the remaining time of the unrecorded portion is counted, and the outputs of the counter 7 and the counter 8 are displayed on the display circuit 9 (step 2). On the other hand, the focus error signal generation circuit 3 generates a focus error signal from the output signal of the optical pickup 2,
The focus servo circuit 4 that corrects the focus error based on this focus error signal is turned on, and the output signal of the optical pickup 2 corresponds to the deviation between the optical pickup 2 and the track (not shown) on the optical disc 1. A tracking error signal generating circuit 5 generates a tracking error signal to perform tracking error correction, and the tracking servo circuit 6 that corrects the tracking error based on the tracking signal error is turned off to move the optical pickup 2 in the radial direction on the optical disc 1. Fast-forward and count the circled portion shown in FIG. 3 with the counter 11 based on the output of the signal comparison circuit 10 that determines that the tracking error signal has reached the zero level as shown in FIG. To count the number of tracks that the optical pickup 2 has crossed. , The optical pickup 2 is moved until this output is equal to the number of tracks recorded in the lead-in area (step 3), the tracking servo is turned on, recording is started, recording is performed, and the same as above. Then, the counter 11 counts the number of tracks of the current recording portion (step 4), and after the recording is completed, the sum of this number of tracks and the number of tracks recorded in the lead-in area is recorded in the lead-in area (step 5). By reading the number of tracks recorded in the lead-in area, the recording time of the recorded portion and the remaining time of the unrecorded portion can be automatically known by the above method.

As described above, according to the present invention, the number of tracks in the recorded portion 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. By reproducing this, the recording time of the recorded area and the remaining time of the unrecorded area are displayed, and the recording location is specified by moving the optical pickup by the number of tracks read from the lead-in area. Can be realized.

[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 signal comparison circuit 10 of FIG. Counter 1
FIG. 4 is an explanatory view of the operation of 1, and FIG. 4 is an explanatory view of a conventional optical disc. 1 ... Optical disc, 2 ... Optical pickup, 3
...... Focus error signal generation circuit, 4 ...... Focus servo circuit, 5 ...... Tracking error signal generation circuit,
6 ... Tracking servo circuit, 7 ... Counter, 8 ...
… Counter, 9 …… Display circuit, 10 …… Signal comparison circuit, 11
……counter.

Claims (2)

[Claims] 1. An apparatus for recording or reproducing an information signal by tracing an optical disc having a spiral guide track with an optical pickup having a laser light source, an objective lens, and a light receiving section. A tracking error signal corresponding to the deviation of the optical pickup is generated from the track based on the output signal of the optical pickup, and the deviation between the optical pickup and the track is corrected based on the tracking error signal. Tracking servo means, a focus servo means for generating a focus error signal based on an output signal of the optical pickup, and drivingly controlling the objective lens based on the focus error signal to correct a focus error; The specified number of tracks on the optical disc Means for recording the number of tracks of a portion recorded in a program area, which is a recordable area of an information signal of the optical disc, in a lead-in area, which is a predetermined portion, and the track recorded in the lead-in area First counting means for counting the recording time of the recorded portion of the program area based on the number of tracks by reproducing the number with the optical pickup, and the total number of tracks in the program area and the lead-in area. Second counting means for counting the remaining time of the unrecorded portion of the program area, and the outputs of the first counting means and the second counting means based on the number of tracks recorded in Display means and a first signal ratio for detecting that the tracking error signal has reached a predetermined level Means, said first
Third counting means for counting the number of tracks traversed by the optical pickup on the basis of the output signal of the signal comparing means, the optical pickup rotating at a constant linear velocity. Information is recorded by moving the optical pickup in the radial direction, and the number of tracks crossed by the optical pickup is counted by the third counting means based on the output signal of the optical pickup. An optical disc recording / reproducing apparatus, wherein the sum of the number of tracks recorded in the lead-in area before recording is recorded in the lead-in area. 2. When recording an information signal in a program area of an optical disc, the number of tracks of the recorded portion recorded in the lead-in area is reproduced, the optical disc is rotated at a constant linear velocity, and a focus servo is performed. Is turned on, the tracking servo is turned off, and the optical pickup is fast-forwarded in the radial direction of the optical disc.
The optical disc recording / reproducing apparatus according to claim 1, wherein the optical pickup is automatically sent to a track portion indicated by the number of tracks recorded in the lead-in area.