JPS63282928A - Information processor - Google Patents

Abstract

PURPOSE:To attain a secure abnormality detection without an erroneous action by making the interval between condensing spots traveling succeedingly and precedingly to be focused in the same track on a recording medium narrower than the gap between the finishing of the unit of an information recording and the next header. CONSTITUTION:At the time of recording information, recording data 27 is supplied through an AND circuit 12 to a laser driving circuit 11. The circuit 11 drives a semiconductor laser 8 and the laser light flux of a strong luminous intensity is generated from the laser 8. By a laser driving circuit 10, the laser light flux of a weak luminous intensity is generated from a semiconductor 9. These laser lights are focused toward an optical disk 2 by an objective lens 5 and on the same track 28, a spot 4 to travel behind and a spot 3 to travel ahead are projected. The interval d1 between these spots 3 and 4 is provided so as to be narrower than a gap between the finishing of the recording unit of the information and the next header. Thus, the spot 3 detects the next block or the address information of a sector and an erroneous action to stop recording is erased.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to an information processing device such as an optical disk device that records or reproduces information on an optical disk using, for example, two focused beams. Regarding.

(Prior art) In recent years, image information such as documents, which are generated in large quantities, is photoelectrically converted by two-dimensional optical scanning, and this photoelectrically converted image information is recorded on an image recording device, or it can be converted as needed. Recently, optical disk devices (information processing devices) have been used as image recording devices in image information file devices that can search, reproduce, and reproduce and output as hard copies or soft copies.

Conventionally, such optical disk devices have used an optical disk that records information in a spiral manner, and recorded or reproduced information using an optical head that moves linearly in the radial direction of the optical disk using a linear motor. It has become.

In such devices, a single-beam optical head using one semiconductor laser is used, and recording and reproduction are performed using this single beam.

Is there any practical use of double recording prevention, which is intended to prevent previously recorded information from being destroyed due to track misalignment due to external vibrations or track defects during recording? (Japanese Unexamined Patent Application Publication No. 1989-1999)
147006).

However, in the above-mentioned apparatus, double writing is detected during recording using a single beam optical head. For this reason, if a track jump occurs during recording, detection is performed after partially destroying the information that has already been recorded, so the error rate may drop or address information may be destroyed. There was.

(Problems to be Solved by the Invention) This invention eliminates the drawback that information that has already been recorded may be destroyed, and can prevent the destruction of information that has already been recorded. Another object of the present invention is to provide an information processing device that can perform reliable abnormality detection without malfunctioning.

[Configuration of the Invention (Means for Solving the Problems)] The information processing device of the present invention includes a first
a focusing means for focusing the second light beams onto the same track on the recording medium, the interval between the focused spots of the light beams being narrower than the gap between the end of the information recording unit and the next header; A detection means detects the reflected light from the condensed spot of the preceding first light beam as the medium progresses as the medium rotates, and information is transmitted according to the detection signal detected by the detection means. It is comprised of a determining means for determining whether or not recording has been completed, and a recording means for recording information using a condensed spot of a trailing second light beam in accordance with the determination result of this determining means.

(Function) This invention focuses first and second light beams emitted from a light source onto the same track on a recording medium, and determines the distance between the focused spots of these light beams or the end of an information recording unit. The gap between the header and the next header is narrower, and as the track progresses as the recording medium rotates, the reflected light from the focused spot of the preceding first light beam is detected, and according to the detected detection signal. It is determined whether the information has been recorded or not, and depending on the result of this determination, the information is recorded using the condensed spot of the second light beam that follows.

(Example) An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of an information processing device, such as an optical disk device, according to the present invention. That is, the optical disk (recording medium) 2 is rotated in the direction of the arrow 1 with a constant linear velocity with respect to the optical head 30 by a motor (not shown). The optical disk 2 has a circular substrate made of glass or plastic, for example, and a donut-shaped metal coating layer made of tellurium or bismuth coated on the surface of the substrate.

Further, the optical disc 2 is formed with spiral tracks as shown in FIG. 2, or concentric tracks (not shown).

Hayabusa An optical head 30 for recording and reproducing information is provided on the line side of the optical disc 2.

This optical head 30 is configured as follows.

That is, 8.9 are semiconductor lasers (light sources), and diverging laser beams (second and first light beams) are generated from these semiconductor lasers 1 and 8.9. In this case, the semiconductor laser 8 transfers information to the optical disk 2.
When writing (recording) on the recording film of the optical disc 2, a laser beam whose optical intensity is modulated according to the information to be written is generated, and the information is read from the recording film of the optical disc 2 (reproduction).
In some cases, laser light with a constant light intensity is generated.

The diverging laser beam generated by the semiconductor laser 8 . 9 is converted into a parallel beam by the collimator lens 7 and guided to the polarizing beam splitter 6 . The laser beam guided to this polarizing beam splitter 6 passes through this polarizing beam splitter 6, enters an objective lens (focusing means) 5 as a condensing lens, and is directed toward the recording film of the optical disc 2 by this objective lens 5. is focused. As a result, as shown in FIG.
．． 4 is now available. Above focal spot 3
is a focused spot that precedes the progress of the track 28 caused by the semiconductor laser 9, that is, the progress of the track as the optical disk 2 rotates; Track 2 above
This is a condensed spot that follows in the traveling direction 1 of 8.

The distance d1 between the focused spots 3.4 on the same track 28 of the optical disc 2 is the gap d shown in FIG.
It is arranged so that it is narrower (smaller) than 2. This eliminates the possibility of malfunctions such as the preceding focused light spot detecting the address information (header) of the next block or sector and stopping recording before one unit of recording is completed, ensuring reliable operation. can be done.

Further, the objective lens 5 is supported movably in the direction of its optical axis and in the direction orthogonal to the optical axis, and when the objective lens 5 is positioned at a predetermined position, the focused light emitted from the objective lens 5 is Laser light (focusing spot 3.
The beam waist of 4) is projected onto the long surface of the recording film of the optical disc 2, and the minimum beam spot is formed on the surface of the recording film of the optical disc 2. In this state, the objective lens 5 is maintained in a focused state and a focused track state, and information can be written and read.

Further, the light reflected from the track 28 by the following focused spot 4 is converted into a parallel light beam by the objective lens 5 at the time of focusing, and is returned to the polarizing beam splitter 6 again. This light is reflected by the polarizing beam splitter 6,
This reflected light passes through a cylindrical lens 13 and a convex lens 14 onto a photodetector 16, which is composed of a four-part detector.
(not shown). The outputs of these photodetection cells become the outputs of the optical head 30.

The output of the optical head 30, that is, the output of the photodetector 16, is used for focal length correction, tracking correction, and reproduction signal.

Further, the reflected light from the track 28 caused by the preceding focused spot 3 is reflected by the objective lens 5 when in focus.
The light beam is converted into a parallel light beam and returned to the polarizing beam splitter 6 again. This light is reflected by a polarizing beam splitter 12, and this reflected light is imaged through a cylindrical lens 13 and a convex lens 14, and is constituted by a photodetection cell (not shown) that converts the light into an electrical signal. . The output of this photodetection cell becomes the output of the optical head 30.

The output of the optical head 30, that is, the output of the photodetector 16, is outputted to a tracking servo circuit 19 and a focusing servo circuit 20 for tracking (track deviation) correction and focal force correction. It is now used for various purposes.

One of the above tracking servo circuits uses the push-pull method to perform the above-mentioned optical detection! Track misalignment is detected in accordance with the detection signal from the +-I device 16, and a current is applied to the coil 29 in response to the detected track misalignment, thereby moving the objective lens 5 in a direction perpendicular to the optical axis. This is to correct track deviation.

The focus servo circuit 20 detects defocus according to the detection signal from the photodetector 16 using an astigmatism method, and causes current to flow through the coil 21 in response to the detected defocus. Accordingly, the objective lens 5 is moved in the optical axis direction to correct the focal point.

The output of the optical head 30, that is, the output of the photodetector 18, is output to a recorded information detection circuit (judgment means) 40, and is used for detecting recorded information. The completed information detection circuit 40 will be explained.

That is, the output of the photodetector 18, that is, the photocurrent, is converted into a voltage by the preamplifier 22. This preamplifier 22
The output of is amplified by the band amplifier 23, and the envelope detection circuit 2
4. This envelope detection circuit 24 obtains an envelope detection output when recorded information exists, and a comparator 25
This is what is output to. This comparator 25 detects recorded information when the envelope detection output is supplied. At this time, if there is recorded information, the comparator 25 outputs a "0" signal as the recorded information detection signal 26.

The output of the recorded information detection circuit 40, that is, the comparator 25
The output of CP
U (not shown) as status information.

The AND gate 12 is connected to the recorded information detection circuit 4.
If the recorded information detection signal is not supplied from 0,
Record data 27 from a CPU (not shown) is output to the laser drive circuit 11 (described later), and when a recorded information detection signal is supplied, the record data 27 from the CPU is output to the laser drive circuit 11 (described later). It is something to block.

The laser drive circuit 10 drives the semiconductor laser 9, and the laser drive circuit 11 drives the AND gate 12.
The semiconductor laser 8
It is what drives the.

Next, the operation in the above configuration will be explained. That is, when recording information, recording data from a CPU (not shown) is supplied to the laser drive circuit 11 via the AND circuit 12. As a result, the laser drive circuit 11 causes intermittent high current to flow through the semiconductor laser 8, and the semiconductor laser 8 generates intermittent laser beams with high luminous intensity. Further, the laser drive circuit 10 generates a (continuous) laser beam of low intensity from the semiconductor laser 9 .

These laser beams are converted into a parallel beam by the collimator lens 7, pass through the polarizing beam splitter 6, enter the objective lens 5, and are focused by the objective lens 5 toward the recording film of the optical disk 2. As a result, as shown in FIG. 3, focused spots 3.4 are irradiated on the same track 28 of the optical disc 2 at predetermined intervals one after the other.

The light reflected from the track 28 by the following condensed spot 4 is guided to the polarizing beam splinter 6 via the objective lens 5. The light guided to this polarizing beam splitter 6 is reflected and irradiated onto a photodetector 16 via a cylindrical lens 13 and a convex lens 14. This photodetector 16 outputs a detection signal corresponding to the amount of irradiated light to a tracking servo circuit 19 and a forcing servo circuit 20. As a result, tracking (track deviation) correction and focusing (defocus) correction are performed. Further, the detection signal from the photodetector 16 is used as a reproduction signal.

Further, the reflected light from the track 28 caused by the preceding focused spot 3 is guided to the polarizing beam splitter 6 via the objective lens 5. This polarizing beam splitter 6
The light guided to is reflected and passes through the cylindrical lens 13,
The light is irradiated onto the photodetector 18 through the convex lens 14. The output of this photodetector 18, that is, the photocurrent is transmitted to the preamplifier 22.
The signal is converted into a voltage by the band amplifier 23, and is supplied to the envelope detection circuit 24. If there is recorded information, the envelope detection circuit 24 obtains an envelope detection output, and the comparator 2) detects the recorded information. As a result, if there is recorded information, the comparator 25 outputs a recorded information detection signal, that is, a "0" signal.

This recorded information detection signal is output to the AND gate 12 and is also output to the CPU (not shown) as status information. Therefore, when the recorded information detection signal is supplied to the AND gate 12, the above C
Laser drive circuit 1, which will be described later, records data 27 from the PU
Cuts off output to 1. This stops the optical disc 2 from being irradiated with laser light based on the recorded data.

As a result, it is possible to stop irradiating the optical disc 2 with the laser light from the recorded data before the recorded information is destroyed due to double writing.

As mentioned above, the track to be recorded is detected by the leading focused spot of the two-beam optical head.
Since it is determined whether a track that has already been recorded is an unrecorded track and whether or not recording is possible is determined based on the result of this determination, even if a recorded track is designated for recording by mistake, it will not be duplicated. Even if the recorded information is not destroyed due to recording, and there is no track skipping due to external vibrations or track defects, etc., we always check in advance with the advance beam, so we can prevent the destruction of recorded information. can.

In addition, the interval between two focused spots on the same track of an optical disc is made narrower than the gap between the end of an information recording unit of one block or one sector and the next header, so that before one unit of recording ends, In addition, reliable operation can be performed without causing a malfunction in which a preceding focused spot detects the address information of the next block or sector and stops recording.

In the above embodiments, the case where information is reproduced using the reflected light from the following focused spot has been described, but the invention is not limited to this, and the reproduction can be performed using the reflected light from the preceding focused spot. You can do it like this. For example, the detection output of the photodetector 18 may be used as the reproduction signal.

Further, although the case where an optical disk is used as the recording medium has been described, the present invention is not limited to this, and a laser card or the like may be used.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to prevent information that has already been recorded from being destroyed, and it is also possible to reliably detect abnormalities without causing malfunctions. Information processing equipment can be provided.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram schematically showing the configuration of an optical disc device, FIG. 2 is a diagram for explaining tracks on an optical disc, and FIG. FIG. 4 is a diagram for explaining two focused spots on a track. FIG. 4 is a diagram for explaining the gap between the end of a storage unit of information and the next header. 2... Optical disk (recording medium), 5... Objective lens (focusing means), 8.9... Semiconductor laser (light source), 1
0.11... Laser drive circuit, 12... AND gate, 18... Photodetector (detection means), 22... Preamplifier, 23... Bandwidth amplifier, 24... Envelope detection circuit , 25... Comparator, 30... Optical head, 4o
...recorded information detection circuit (judgment means), d, ...
Distance between focused spots, d2...gap.

Claims (2)

[Claims] (1) In an information processing device that records information in an information recording unit of one block or one sector between a pre-header on a recording medium, the first and second light beams emitted from the light source are emitted from the same on the recording medium. A focusing means for converging the light beams on the track and having a narrower interval between the focused spots of the light beams than the gap between the end of the information recording unit and the next header; , a detection means for detecting reflected light from the condensed spot of the preceding first light beam; a determination means for determining whether information has been recorded in accordance with a detection signal detected by the detection means; and a determination means for determining whether information has been recorded or not. An information processing device comprising: recording means for recording information using a condensed spot of a trailing second light beam according to a determination result of the means. (2) When the determining means determines that the information has been recorded, it stops recording the information by the condensed spot of the subsequent second light beam. The information processing device described.