JP2754065B2 - Recording method of optical recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical recording system having a function of self-diagnosing the recording power of a laser used for optical recording and reproduction using an optical disk or a card as a recording medium. The present invention relates to a recording method of a reproducing apparatus.

[Conventional technology]

In recent years, this type of optical recording / reproducing apparatus has been remarkably entering the industry for use in video disks, CDs, office file memories, and personal computers.

Hereinafter, an example of a conventional optical recording / reproducing apparatus will be described with reference to the drawings.

FIG. 2 shows a basic configuration of a conventional optical recording / reproducing apparatus. In FIG. 2, (1) shows an optical disk as a recording medium, and (2) shows a disk motor for rotating the optical disk (1). (3) an optical head for recording a signal on the optical disc (1) by a laser and reproducing the signal recorded on the optical disc (1);
A semiconductor laser, an optical system, an objective lens, a driving actuator, a focus error detection system, a tracking detection system, and a signal detection system.The light beam emitted from the semiconductor laser is condensed by the objective lens,
The light beam reaches the recording film surface of the optical disk, and the reflected light beam reaches a photodetector for error detection. The photodetector detects a shift in the focus direction and a shift in the tracking direction, and detects a shift in each direction. The objective lens is driven by an actuator to correct the value within a predetermined value.

Reference numeral (4) denotes a linear actuator which includes a carriage on which the optical head (3) is mounted, a coil, a magnet, a yoke, and a rail for the carriage. Move. (5) is an amplifier circuit for amplifying an output signal from the signal detection circuit of the optical head (3), (6) is a semiconductor laser driving circuit as a laser control circuit, and (7) is light for detecting a focus error and a tracking error. An amplifier circuit for amplifying an output signal from the detector, and (8) is a disk motor drive control circuit.

(9) a signal processing circuit for sending a pit reproduction signal from the optical head (3) amplified by the amplifier circuit (5) of the signal detection circuit to the drive control circuit as binarized data; At the time of recording, the output of the laser beam is radiated in the recording power mode onto the disk surface of the optical disk (1) in accordance with a signal from a drive control circuit (13), which will be described later, so that a pit row Further, at the time of reproduction, the presence or absence of a pit is read by the intensity of the reflected light by setting the output of the laser beam to the reproduction power mode.

(10) is a drive circuit of the linear actuator (4),
Control is performed to move the optical head (3) to a target position at a high speed based on the position signal and the speed signal detected by the photodetector of the optical head (3). (11) is the focus control circuit, (1)
2) is a tracking control circuit.

The drive control circuit (13) controls execution of various operations in response to commands from controllers such as the control circuits, and sends an execution state to each controller.

The operation of the optical recording / reproducing apparatus configured as described above will be described below.

First, the disk (1) is mounted on the disk motor (2). The disk motor drive control circuit (8) is driven by the disk motor (2) according to a command from the drive control circuit (13).
Is controlled to be constant. Next, the semiconductor laser of the optical head (3) is controlled by the semiconductor laser drive circuit (6) according to a command from the drive control circuit (13).

Further, a focus control circuit (11) and a tracking control circuit (12) control the focus direction and the tracking direction.
Do with. At this time, the optical head (3) is fed by a drive circuit (10) using a linear actuator (4).
Focus control circuit (11) and tracking control circuit (1
After the focus and tracking control operations are performed according to 2), the signal detection circuit amplifies the signal detection by the amplifier circuit (5) and sends it to the signal processing circuit (9). It is converted into a value and sent to the drive control circuit (13).

[Problems to be solved by the invention]

However, according to the conventional configuration as described above, the fluctuation of the power emitted from the semiconductor laser is controlled by a command from the drive control circuit (13).
However, these circuits cannot clearly detect the power degradation of the semiconductor laser. Therefore, when the power of the semiconductor laser is degraded, there is a problem that a data error occurs at the time of binarizing the reproduction signal of the pit at the time of recording on the optical disc (1).

The present invention has been made in view of the above-mentioned problems, and always detects deterioration of the recording power of a semiconductor laser prior to information recording on an optical disk, thereby enabling reproduction of a pit reproduction signal of a pit on an optical disk. It is an object of the present invention to provide a recording method of an optical recording / reproducing apparatus capable of stably performing value conversion.

[Means for solving the problem]

In order to achieve the above object, a recording method of an optical recording / reproducing apparatus according to the present invention comprises a semiconductor laser serving as a light source when optically recording / reproducing information, and a reflected light emitted from the semiconductor laser and reflected on an optical disk. An optical pickup device having a detector that outputs an electric signal, a laser power control unit that controls a laser power of the optical pickup device, and a detection circuit that detects a return light amount emitted from the semiconductor laser during recording; At a specific position of the recording medium, the laser power control unit sets the semiconductor laser in a recording state, and determines the laser deterioration by comparing the amount of light emitted from the semiconductor laser and returned from the recording medium with a preset reference value. By detecting disc contamination and lens contamination, a signal indicating laser deterioration is output from the detection circuit. Blocking the emission of the laser when it is force, it is characterized in that the data are recorded on the optical disk can be stabilized and protected.

[Action]

According to the present invention, first, when there is an abnormality in the laser control circuit, the abnormality can be detected by the laser power diagnosis means.

Immediately after the recording medium is started, if the optical disk is used as a recording medium, the head is moved to the specific position of the recording medium, for example, the innermost circumference. Since the deterioration of the head can be detected, it is possible to confirm the necessity of the laser exchange of the head by notifying the information of the deterioration of the control system laser power after the detection.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an optical recording / reproducing apparatus according to this embodiment. In this figure, portions having the same configuration and operation as those of the above-described conventional example are denoted by the same reference numerals, and description thereof will be omitted to avoid duplication.

(J) is a laser power diagnostic means, which has a diagnostic function of detecting an abnormality of the semiconductor laser drive circuit (6) as a laser control circuit and rotates the optical disk (1) to a state where recording and reproduction can be performed. Immediately after the optical disk (1) is started, at a specific position on the optical disk (1), the presence or absence of an abnormality in the laser power is diagnosed. And a switch (15) for switching the output of the amplifier (5) to a path to the signal processing circuit (9) and a path to the comparator (14). ing.

The operation of the optical recording / reproducing apparatus having the above-described laser power diagnostic means (J) will be described below.

First, after mounting the optical disk (1) on the disk motor (2), the disk motor drive control circuit (8) controls the rotation speed of the disk motor (2) to be constant according to a command from the drive control circuit (13). Next, the drive control circuit (13)
The semiconductor laser of the optical head (3) is controlled to the reproducing power by the semiconductor laser drive circuit (6) in accordance with the command from. Further, the focus control and the tracking direction are controlled by a focus control circuit (11) and a tracking control circuit (12). At this time, the optical head (3) is fed by a drive circuit (10) using a linear actuator (4). After the focus and tracking control operations are performed by the focus control circuit (11) and the tracking control circuit (12), the signal detection is amplified by the amplifier circuit (5).
The signal is sent to the signal processing circuit (9) via the changeover switch (15), and the signal is binarized and sent to the drive control circuit (13).
The optical recording / reproducing apparatus is now in a reproducing state.

Thereafter, the linear actuator (4) is operated to the innermost circumference by the drive control circuit (13). Next, the laser power is changed to the recording power by the drive control circuit (13), the switch is switched to the path of the comparator (14) by the changeover switch (15), and the return light from the optical disk (1) is amplified by the amplifier circuit (5). ), And the detection signal is compared by a comparator (14). When the detected signal is equal to or higher than the reference set voltage Vref, the laser power is diagnosed as normal, a normal signal is sent to the drive control circuit (13), and the changeover switch ( 15) is changed to the path of the signal processing circuit (9), and normal operation is performed.

When the detection signal is equal to or lower than the reference set voltage Vref, it is diagnosed that the laser power is degraded, an abnormal signal is sent to the drive control circuit (13), and the changeover switch (15) is set to the signal processing circuit (9). , The operation of the optical recording / reproducing apparatus is stopped, and the laser is changed.

As described above, according to this embodiment, the optical disk (1) is moved by the linear actuator (4) immediately after the reproduction state.
The optical head (3) is moved to the innermost periphery of the optical head, and the return light for forcibly emitting the recording power is received by the detector of the optical head.
The optical head (3) converts the light amount into a voltage and compares whether or not the laser power is degraded by the comparator (14) of the laser power diagnostic means (J).
Of the laser power can be detected. When the laser power is degraded, the laser degradation is always recognized by operating the laser power diagnostic means (J) every time the optical disc (1) is mounted.

Although the present invention has been described with reference to a disk, the present invention is also effective for media such as tapes and cards.

〔The invention's effect〕

As described above, according to the present invention, it has a diagnostic function of detecting an abnormality of the laser control circuit, and immediately after starting to rotate or run the recording medium in a state where recording and reproduction can be performed, By providing a laser power diagnosis means for diagnosing the presence or absence of an abnormality in the laser power at a specific position, whether or not the laser power of the optical head has deteriorated can always be recognized prior to recording on the optical disk. The excellent effect that the binarization of the reproduced signal of the pit can be stably performed can be achieved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an optical recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a basic configuration of a conventional optical recording and reproducing apparatus. (1) ... recording medium, (3) ... head, (6) ... laser control circuit, (J) ... laser power diagnostic means.

Claims (1)

(57) [Claims] An optical pickup device comprising: a semiconductor laser serving as a light source for optically recording / reproducing information; and a detector for outputting, as an electric signal, a reflected light emitted from the semiconductor laser and reflected on an optical disk; A laser power control unit that controls the laser power of the optical pickup device, and detects laser deterioration by detecting the amount of return light of the semiconductor laser from the recording medium at the time of recording with the detector and comparing it with a preset reference value. Providing a detection circuit for outputting a signal, immediately after starting to rotate or run the recording medium in a recording / reproducible state, at a specific position of the recording medium, the laser power control unit in a recording state, An optical recording / reproducing device which shuts off the emission of the laser when a signal indicating laser deterioration is output from a detection circuit. Recording method of the device.