JPS6286550A - Recording and reproducing method for light information - Google Patents

Abstract

PURPOSE:To improve the efficiency of recording and reproducing of light information by forming a spot at the adjoining track of an optical disk with two light emitting elements, recording the information with one side spot and reproducing or detecting the condition of a track with other side spot. CONSTITUTION:An optical disk 1 is rotated, the light to come out from the first and second light emitting elements 2 and 18 is irradiated through a lens 3, a beam splitter 4 and a focusing lens 5 to an optical disk 1 and the first and second spots 21 and 22 are respectively converged at the center of the adjoining track. The bit recorded at the optical disk by the first spot 21 is detected by the second spot 22, the reflected light is made incident through a lens 5, beam splitters 4 and 6 and a condensing lens 7 on a photoelectric transducing element 19. The output signal is reproduced by an information reading circuit 20, collated with the signal sent to the light emitting element 2, and thereby, the correction of the reproducing information is decided.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an optical disc that allows the recording surface of an optical disc to be inspected after information has been recorded, and another invention that provides an optical disc that allows the state of the target to be recorded to be inspected. This relates to information recording and reproducing methods.

[Conventional technology]

FIG. 5 is a block diagram showing a conventional optical disk device. In the figure, (1) is an optical disk provided with concentric or spiral guide tracks so that information can be recorded, and (2) is a light source for recording information on the optical disk (11) and reproducing the recorded information. A semiconductor laser diode (hereinafter referred to as a light emitting element) that outputs light that is A beam splitter (5) reflects light toward the recording surface of the optical disc (1) and transmits the light reflected by the optical disc (1).
), and (6) is an eight-point mirror that splits the light reflected by the optical disk (1) and transmitted through the beam splitter (4) into first light and second light. , (7) is a condenser lens that converges the first light, and (8) is a photoelectric conversion element that converts the converged first light into an electrical signal, which converts the converged light, track deviation, and data signal. To detect. (9) is a processing circuit that receives the electric signal from the photoelectric conversion element (8) and reproduces the data signal and corrects the track deviation; OI is a tracking actuator for correcting the track deviation that operates according to the commands of the processing circuit (9); Qt) is the second
The second condenser lens (I2) that converges the light is a light amount conversion element that converts the converged second light into an electrical signal, and detects a focus shift. (13) is a photoelectric conversion element (12
) is a repair circuit that corrects the focus shift by receiving electrical signals, (+4) is a focus lens actuator that operates according to commands from the repair circuit (13), and Qs) is a signal circuit that processes information recording and reproduction signals. , (IG) is a rotating device that rotates the optical disk +11, (+7) is a rotating device (
(2) is a spot where the output light of the light emitting element (2) is focused on the recording surface of the optical disc (1). Next, the operation will be explained. When the control circuit (+7) drives the rotating device (IfJ) and the light emitting element (2) so that the optical disc (1) rotates at a predetermined rotational speed, the spot (2) is located at the center of the optical disc (11 tracks). Tracking control and 7-o-cutting control are performed so that the information is converged on the optical disc (11), and it is possible to record information on the optical disc (11) or reproduce the recorded information.When writing information to the optical disc (1), Light emitting element (2) by signal processing circuit (15)
Modulation suitable for information recording is applied to the optical disc (11), and the reflected light is changed physically or chemically, and the optical output necessary to maintain that state until it is restored to its original state by applying new heat or magnetism is applied. , information is recorded on the recording surface of the optical disk (1) by thermal or magnetic means with a change commensurate with the modulated information.(The recorded modulation part is called a pit) Also, information is recorded from the pits of the optical disk (1). Reproduce(
When writing data (reading), lower the optical output of the light emitting element (2) to an extent that does not change even if it is applied to the optical disc (1), and when writing data (writing information recording data), lower the optical output of the light emitting element (2) to the extent that it does not change when it is applied to the optical disc (1).
The change in the reflected light applied to 1, that is, the recorded information commensurate with the recorded information is reproduced by the photoelectric conversion element, the processing circuit, and the processing circuit (No. 3 processing circuit (15)).

[Problem that the invention seeks to solve]

Conventional optical information recording and reproduction is performed as described above, so when recording information on multiple tracks in succession, it takes a long time to check the status of the track to be recorded or to check the verify read after recording. There was a problem that it took time.

This invention was made to solve the above problems, and detects whether the recorded information is correct or incorrect in parallel with the recording of the information. It is designed to detect the state of the truck.

[Means for solving problems]

The method for recording and reproducing optical information according to the present invention includes forming a first spot and a second spot with a first light emitting element and a second light emitting element, and irradiating each spot onto each adjacent track of an optical disk. It is something to do.

In still another invention, information is recorded at a first spot, information recorded at a second spot is reproduced, and the state of the track before recording is detected at a third spot. It is.

[For production]

In this invention, information is recorded at the first spot and information recorded at the second spot is reproduced. Further, the state of the track before recording is recorded using the first spot and recorded using the second spot is detected.

Furthermore, in another invention, recording is performed using a first spot, the state of the track before being recorded is detected using a second spot, and the recording is reproduced using a third spot.

〔Example〕

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

In Figures 1 and 2, (1) to (17) and (2)
) is the same as the conventional one, but (2+ (81(91
For convenience of explanation, these will be referred to as a first light emitting element, a first photoelectric conversion element, and a first processing circuit, respectively. (1B) is the second light emitting element, which is arranged in parallel with the first light emitting element (2), and the re-emitting element (21 (+8) is driven by the circuit (+5) for signal processing.09) is the second light emitting element (2). A second photoelectric conversion element that outputs light from the light emitting element (21 (181) and applies it to the optical disc (1), and converts the light that is applied to the optical disc (1) and reflected by the optical disc (1) into a second electrical signal. (to) is a reading device that reads the second electrical signal, and the output of this reading device (to) is sent to the signal processing circuit θ5). ) is the second light emitting element (rumored second spot where the light is focused) on the recording surface of the optical disc +11, and the track (2) is illuminated by the first spot (9).
The adjacent track (2) is irradiated. (To) Track t is formed on the optical disc (1) and can record information.
24) is a pit in which information is recorded in the L rack (to).

In the device shown in FIG. 1, when the optical disk (1) is rotated and the first and second light emitting elements (21 (o+l) are driven, the first spot (6) is focused on the center of the track (to). Tracking control and focus lens control are performed in the same way as in the past.At this time, the second spot (2) is located at the center of a predetermined track (to) adjacent to the first spot (2). has been converged on.

Here, a case will be described in which the second spot (#) is irradiated to a pit that is one track behind the first spot (6). However, the path and operation of the output light of the first light emitting element (2) are the same as in the prior art, so a description thereof will be omitted. 1st
(in the pit where information is recorded on the optical disk (1) by the spot (2)) is detected by the second pot (to) after a delay of one track, and the reflected light is (5) - (4)
-+61, the light is converted into a second electrical signal by the condensing lens (7) and the second photoelectric conversion element θ9).

The second electrical signal is reproduced into information by the information reading circuit (to), and the signal processing circuit (+5) compares it with the signal sent to the first light emitting element (2) as recorded information, thereby generating the reproduced information. If the reproduced information error correction section of the signal processing circuit (15) cannot correct the error, the alternative sector is controlled to be re-recorded on the alternative track.

Also, if the second spot (2) is irradiated onto the pit one track earlier than the first spot (6), the second spot (2)
spot (a pit k in which information has already been recorded on the track (2) scheduled for recording with the first spot (2), for example, by leading continuous recording by the first spot (2))
The presence or absence of defects in the track (2) is checked, and if the track (2) is not suitable for recording information, the alternative sector is controlled to be recorded on the alternative track.

Other embodiments are shown in FIGS. 3 and 4. In the figure, (
1) to (2) @) are almost the same as those in FIGS. 1 and 2. (2) is a spectroscopic element such as a diffraction grating or beam splitter that splits the light beam outputted by the second light emitting element (18) and made parallel by the collimator (3) into two, and (27) is a spectroscopic element (2S). The luminous flux divided by It has been converged. (to) is a third photoelectric conversion element installed in parallel with the first photoelectric conversion element (8), with the first photoelectric conversion element (3) in the center and the second photoelectric conversion element ((-)) A third photoelectric conversion element (2)) is arranged on each predetermined side, and reflected light from the optical disk (1) is focused on each spot (2) (1) Φ) by a condenser lens (7). is converted into a predetermined electrical signal.

The electric signal of the first spot (2) is also sent to the first processing circuit (9).
), the electrical signals are sent to the second and third spots (E) (27) respectively to the reading device (To), and the signal processing circuit (1
5).

In such an optical disk device, information is recorded and reproduced at the first spot (2) by the output of the first light emitting element (2), and information is recorded and reproduced at the first spot (2) by the output of the second light emitting element (18). The state of track (2) one round before the track (2) on which information is recorded in the first spot (2), that is, the state of the track (2) that has already been recorded, is determined by one of the second spot k) and the third spot ψ). The presence or absence of defects in the track (c) and the presence or absence of defects in the track (c) are detected, and the bit recorded in the first spot (2) is detected in the other spot. The information detected from both spots (e) and stem) is sent to the second processing circuit (
) and the signal processing circuit (+5), and the track (
When it is impossible to record information in (b) or when there is an error in the recorded information, control is performed to re-record on an alternative sector or alternative track in the same way as in the embodiment of FIG.

[Effects of the Invention] As described above, according to the present invention, tracks adjacent in the radial direction of an optical disc are irradiated with first and second spots formed by the first and second light emitting elements, respectively, adjacent to each other. However, since information is recorded in one spot and the recorded information is reproduced or the state of the track is detected in the other spot, the efficiency of recording and reproducing optical information is improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an optical disk device according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of the optical disk used in the first embodiment, and FIGS. 3 and 4 are block diagrams showing other embodiments. FIG. 5 is a partially enlarged view of an optical disc, and is a block diagram showing a conventional one. In the figure, (1) is the optical disk, (2) is the first light emitting element, (8) is the first photoelectric conversion element, (1m is the second light emitting element, (+9) I and the second
In the photoelectric conversion element, (9) is the first spot, and (to) is the second spot. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (4)

[Claims] (1) In a method of recording and reproducing optical information by irradiating a track of an optical disk with a spot obtained by converging the output light of a light emitting element, a first light emitting element and a second light emitting element A method for recording and reproducing optical information, characterized in that two spots are formed and each of the spots is irradiated onto each of the adjacent tracks of the optical disc. (2) The first spot records information, and the second spot reproduces the information recorded in the first spot. How to play. (3) The light according to claim 1, wherein the first spot records information, and the second spot detects the state of a track one track before the first spot. How to record and reproduce information. (4) In a method of recording and reproducing optical information by irradiating a track of an optical disk with a spot obtained by converging the output light of a light emitting element, the first spot emitted from the first light emitting element records information on the first track. recording, and dividing the light emitted from the second light emitting element to form a second spot and a third spot, so that the second spot is connected to the first spot irradiated with the first spot. 2nd row adjacent to the track
detecting information on the first track by irradiating the spot on the first track, and detecting the state of the recording surface by irradiating the third spot on a preceding third track adjacent to the first track. A distinctive method for recording and reproducing optical information.