JPS5883336A - Disk recording or reproducing system - Google Patents

Abstract

PURPOSE:To improve the use rate of a disk while allowing signal recording and reproduction even in a deficient band area by making recording density lower than that of a main recording part, and recording a coded signal on an internal circumferential surface. CONSTITUTION:A head 4 is moved to an internal circumferential surface and a rotation driver 3 is rotated at a specified speed; and a bar code signal is supplied from a condition signal supplying circuit 11 to an optical modulator 8. Consequently, a radiation beam from a light source 6 is modulated by a bar code signal to obtain a modulated light beam 2, which is projected upon a disk 1 to form a recording area corresponding to the bar code signal. During reproduction, light radiated from a light emitting element 16 is reflected by the disk 1 to reach a photodetecting element 17, and a bar code reader 18 reads the bar code signal. Then, a main recording signal is recorded and reproduced. Consequently, a condition signal in the form of a bar code is recorded by the same recording device with the main recording signal, improving the use rate of the disk.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recording or reproducing signals using a disk-shaped recording medium.

The inner peripheral portion of the video disc is not used for recording or playback due to insufficient bandwidth. Therefore, the disk utilization rate was poor.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a recording or reproducing method that effectively utilizes the inner peripheral portion of a disc.

In order to achieve the above object, the present invention provides a coded recording or reproduction condition signal on the inner circumferential side of the main recording portion, the recording density of which is higher than the recording density of the main recording signal in the main recording portion. rotating a disk recorded at a small recording density; reproducing the encoded recording or reproducing condition signal prior to recording or reproducing the main recording portion;
A disc recording or reproducing method comprising setting a recording or reproducing condition based on the reproduced recording or reproducing condition signal and recording or reproducing the main recording part. According to the present invention, the main recording Since the recording or playback condition signal is coded and recorded at a recording density lower than the area, it is possible to record and play back signals even in areas where there is insufficient bandwidth, making it possible to improve disk utilization. Become. In addition, recording or reproduction condition signals such as a light beam intensity setting signal, a rotation speed setting signal, and a program for determining the optimum light intensity are recorded. It becomes possible to record or reproduce data appropriately and easily.

Embodiments of the present invention will be described below with reference to the drawings.

The optical recording and reproducing system according to the embodiment of the American invention shown in FIG. is configured to cause Incidentally, the relative scanning motion moves the disk fi+ to the disk rotation driving bag f.
The head (4) rotates at (3) and projects the light beam (2).
) by feeding with a radial feed drive (5). The light beam (2) is provided by a light source (6) consisting of an Ar laser.
), an attenuator (7) for controlling the amount of light, an optical modulator (8), a beam splitter (9), and a condensing lens.

A condition signal supply circuit aυ is provided in order to record a recording or reproduction condition signal in the form of a bar code, that is, a rod-shaped code, in a narrow part of the frequency band in the inner circumference of the disk +11. It is configured to be selectively connected to the optical modulator (8) via the amplifier a3. Further, a video signal supply line I is connected to contact a of the changeover switch α2 for recording a video signal, that is, a main recording signal.

This device is specially equipped with a light source for reproduction. Therefore, the reproduction light beam is created by reducing the laser power to the reproduction level by the attenuator (7) and by setting the optical modulator (8) to non-modulated operation. The reproduction light beam thus obtained is projected onto the disk (1), and its reflected light passes through the beam splitter (9) and reaches the photoelectric converter (L!9), where the signal is read.

The reproduction of the main recording is performed using the light beam (2) as described above, but the reproduction of the recording or reproduction condition signal recorded on the pad is performed using the light emitting element ( In this embodiment, the optimum light intensity for the disc (1) #c is set as a barcoded condition signal, which is performed by a barcode reading device a second, that is, a barcode sensor, consisting of a light receiving element (171) and a light receiving element (171). The optimum light quantity setting control signal is recorded and is detected to control the light quantity, so an optimum light quantity setting control signal forming circuit Ql is connected between the light receiving element aη and the optical attenuator (7).

The optimum light amount setting control signal is a setting control signal for obtaining the optimum light amount determined in relation to the type, thickness, etc. of the metal layer Qv as shown in FIG. 3 in the disk (11). In other words, the attenuator (7) is attached to the disk (11) shown in FIG.
The light intensity of the light beam (2) is changed over time from the minimum to the maximum or vice versa, and a constant modulated light beam corresponding to a constant frequency signal of, for example, 3 MHz is projected onto the disk Ill K to form a record. A reproduction light beam is projected immediately after the reproduction light beam to perform virtually simultaneous monitoring, and changes in light intensity and reproduction output are determined, and the light quantity when the reproduction output is maximum is determined as the optimum light quantity, and the attenuation at this time is determined. The control signal of the device (7) is used as the optimum light amount setting signal. Furthermore, in detail, the transmitted or reflected light of the reproduced light beam is detected by a photoelectric converter, this is envelope-detected, the time when this output is maximum is determined as the optimum light intensity, and the light beam (2) with the optimum light intensity is projected. The control signal for the attenuator (7) at the point in time is defined as the optimum light amount setting control signal. Then, the determined optimum light intensity setting control signal is stored in a memory, and is applied to a condition signal supply circuit (11) K, where it is converted into, for example, a 75-bit barcode signal and recorded in the area P of the disk tt+. . The barcode signal corresponding to the optimum light intensity setting control signal read by the barcode reading device α is converted into an analog optimum light intensity setting control signal by the control signal forming circuit (li) and is supplied to the attenuator (7). , used for light intensity control.

When recording the reproducing condition signal in the form of a bar code using the device configured as shown in Fig.
The head (4) is moved so that the image 2) is projected onto the narrow band area on the inner circumference of the disk Il+ shown in FIG. A 76-bit /(-code signal) is supplied from the signal supply circuit al to the preconditioner (8). As a result, the beam emitted from the light source (6) is modulated by the -code signal. A light beam (2) is projected onto the disk (11), and a reflective metal layer (silica 1) consisting of a Cr vapor deposited layer previously provided on the entire surface of the transparent glass substrate (11) shown in FIG. 3 is selectively removed by laser etching. A recording area force is formed in which the reflective metal layer υ and the light/transparent part @ are arranged corresponding to, for example, a 75-bit code signal. When the scanning is 1/(-), if the record cannot be optically read by the code signal reading device Qgj, a record as shown in Fig. 2 is formed by scanning multiple times. When the recording of the code signal is completed, as shown in FIG. This makes it possible to read barcode signals corresponding to the presence or absence of the reflective metal layer Qυ.Therefore, the disc (
11 main recording area P! When the disk (1) is rotated in order to record the main recording signal on the head ( A scanning position detection signal from the scanning position detector (incorporated) provided in connection with 4) is input to the control circuit (19). A signal is formed and sent to the attenuator.Therefore, when recording a video signal at high density in the main recording area using the modulated light beam (2) corresponding to the main recording signal, the beam (2) with the optimum light intensity is transmitted to the disk (
11.

Note that the change in light amount corresponding to the scanning position is set such that the light amount increases linearly as the scanning position moves toward the outer periphery. In this embodiment, since one disk (1) is rotated at a constant speed, the scanning speed increases as it approaches the outer periphery.If the light intensity of the beam (2) is constant, the light intensity will be insufficient at the outer periphery, and optimal recording will not be possible. It becomes impossible. Therefore, the amount of light is linearly increased toward the outer periphery. However, in the case of a constant speed scanning method, there is no need to change the light intensity of the beam (2) depending on the scanning position.

As is clear from the above embodiment, this embodiment has the following advantages.

(al) The barcoded condition signal is recorded at a low recording density using the narrow frequency band on the inner circumference of the disk (1).This button makes it possible to easily set the recording conditions. This enables optimal recording.

[b) It is possible to record the barcoded condition signal with the same recording device as the main recording signal, and barcode recording can be easily achieved.

(Since CI barcodes are recorded at a low density, barcodes can be read without focus or tracking control. They can also be read with high reliability.

(d) Since the barcode reader a9 is installed,
It becomes possible to read the barcode signal regardless of the scanning position, and even when recording from the middle of the disc tl+, it is possible to obtain the optimal light amount control signal j for this position.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and can be further modified. For example, while a constant frequency signal is supplied to the optical modulator (8), the light amount is changed cointegratively with time by the attenuator (7), and a trial record for determining the optimum light amount is made outside the area P. The light intensity at the point where the recording is read by the reproduction light beam and the reproduction output is maximum is defined as the optimum light intensity, and the barcode signal for obtaining this optimum light intensity is set in the area P as shown in FIG.

may be recorded.

Furthermore, the attenuator (7) may be inserted on the output side of the optical modulator (8). Also, the control of the light source (7) or the light modulator (9)
If it is possible to change the light amount by controlling the above, the optimum light amount may be determined by these controls.

Further, the present invention is not limited to the case of forming a record for reproduction by the transmission method, but can also be applied to the case of making a disc to be reproduced by the reflection method. It is also applicable to a reproduction-only disc, and reproduction condition signals such as reproduction beam intensity, focus conditions, rotation speed, etc. may be recorded in each area. It is also applicable when using a magneto-optical recording medium, etc., as shown in Fig. 3. Also, it is possible to record signals using optical pits like a Philips format video disk. It is also applicable to those who

Further, the code notes indicating recording or reproduction conditions may not be read by a dedicated code reading device, but may be read by a reproduction light beam for reading the color record.

Moreover, although it is desirable that the records of area birds be concentric circles, the records of -area P are not limited to concentric circles and may be spiral. Further, the beam (2) may be either visible light or non-visible light.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a recording and reproducing system according to an embodiment of the present invention, FIG. 2 is a plan view of a recording medium, and FIG. 3 shows the relationship between the area P1 of the disk in FIG. FIG. 2 is a partially cutaway sectional view. In addition, in the symbols used in the drawings, 111 is a disk, (2) is a light beam, (3) is a rotational drive device, and (5)
is the feed drive device, Qυ is the code signal supply circuit, (L9 is the seed reading device. Agent Noriji Takano)

Claims (2)

[Claims] (1) A disc in which a coded recording or reproduction condition signal is recorded on the inner circumferential side of the main recording part at a recording density that is smaller than the recording density of the main recording signal in the main recording part. rotating the main recording portion; reproducing the encoded recording or reproducing condition signal prior to recording or reproducing the main recording portion; and setting recording or reproducing conditions based on the reproduced recording or reproducing condition signal. , recording or reproducing the main recording portion. (2) The recording or reproducing condition signal is recorded as a bar code on one circumference of the disk, and reproducing the recording or reproducing condition signal is provided separately from the recording or reproducing head of the main recording section. 1. The recording or reproducing method according to claim 1, wherein the recording or reproducing method is to read a bar code using a bar code sensor.