JP2559719B2 - Optical information recording device - Google Patents

Description

The present invention relates to an optical information recording device for recording information on an optical recording medium such as an optical card, a compact disc, a video disc and a magneto-optical disc.

[Conventional technology]

The conventional optical information recording device is configured to record information on each track of the optical recording medium in only one row along the track direction.

[Problems to be solved by the invention]

Therefore, for example, in an optical card such as an optical card having a guideline for obtaining a clock signal indicating the timing of writing information for each track and a focus error signal and a tracking error signal for the track of the write head, There is a problem that the area ratio of the guideline to the information recording area becomes large and the information recording density in one track becomes low. Further, when recording and reproducing information while conveying an optical recording medium such as an optical card in the track direction, for example, the recording speed is 15 kb / s, the reproduction speed is 100 kb / s.
If it is set to s, even if the transport speed of the recording medium can be easily obtained at the time of recording, it is necessary to increase the speed at the time of reproduction, so a high output motor is required and power consumption increases. However, there is a problem that downsizing and cost reduction cannot be achieved.

The present invention has been made in view of such conventional problems, and it is possible to increase the recording density for one track of a recording medium and to reproduce the recorded information at high speed by a small-sized and low-cost reproducing apparatus. An object is to provide an appropriately configured optical information recording device.

[Means and Actions for Solving Problems]

In order to achieve the above object, in the present invention, means for illuminating an optical recording medium, and one track of the optical recording medium so as to receive reflected light of the illumination light by the illuminating means on the optical recording medium A plurality of light receiving elements arrayed in a direction orthogonal to the track corresponding to the light source, a light source for selectively emitting the first light capable of optically writing information and the second light not capable of writing information, and this light source Scanning means for scanning the light from the above in the direction orthogonal to the track on the illuminated area on the optical recording medium by the illuminating means, and the illuminating light to the light receiving element based on the output of each of the light receiving elements, and Means for detecting the incidence of the second light respectively, and control means for controlling the light source to selectively project the first light on the optical recording medium based on the output of the detecting means. Include the above While illuminating the optical recording medium in a spot shape by the illuminating means, the second light is emitted from the light source and is scanned by the scanning means in the direction orthogonal to the track, and based on the output of the detecting means. The first light is selectively emitted from the light source via the control means, so that information can be recorded in a plurality of lines on each track of the optical recording medium.

〔Example〕

1A to 1C show the essential parts of an embodiment of the present invention. This embodiment shows an optical card read / write device. FIG. 1A is a perspective view of a recording / reproducing head and its drive mechanism, FIG. 1B is a plan view, and FIG. 1C is FIG. 1B.
6 is a cross-sectional view taken along line CC of FIG. The recording / reproducing head 1 has a frame-shaped holding member 2 having a bottom, and in this holding member 2, all the optical elements of the light emitting diode 3, the lenses 4 and 5, the mirror 6, the photodetector 7, the semiconductor laser 8 and the mirror 9 are provided. Hold the system. Here, the lenses 4 and 5 are provided by fitting to the bottom surface 2a of the holding member 2, and the mirror 9 is attached to the holding member 2 via the bimorph 10. The mirror 9 is made of a material that transmits the light (wavelength 0.88 μm) from the light emitting diode 3 and reflects the light (wavelength 0.78 μm) from the semiconductor laser 8.

In this embodiment, the light from the light emitting diode 3 is transmitted through the mirror 9 and then projected onto the optical card 11 through the lens 4 to spot-illuminate the optical card 11, and the reflected light thereof is reflected by the lens 5 and the mirror 6. Through photo detector 7
Incident on the photodetector 7 to form a spot image of the optical card 11, and the light from the semiconductor laser 8 is reflected by the mirror 9 and then projected onto the optical card 11 via the lens 4 and reflected. Light is made to enter the photodetector 7 through the lens 5 and the mirror 6. In this way, the recording / reproducing head 1 can be made compact by holding all the optical systems on the holding member 2 and reflecting the reflected light from the optical card 11 by the mirror 6 and guiding it to the photodetector 7. . The light from the semiconductor laser 8 is spotted by the light emitting diode 3 on the optical card 11 by driving the bimorph 10 and displacing the mirror 9, as shown in a partial detailed view in FIG. In the illumination area, the optical card 11 is moved in the direction orthogonal to the track.

The holding member 2 is formed by projecting both end portions of opposite side walls 2b and 2c extending in the track direction of the optical card 11 so as to protrude from walls 2d and 2e connecting the both side walls 2b and 2c. The focus coil 12 is wound around the outer periphery of the holding member 2 across both side walls 2b and 2c.
Tracking coils 13a to 13d formed by bending flat coils are attached to the four corners around which is wound. This holding member 2 is 4
Through the linear elastic support members 14a to 14d of the book, the slider 15 rises so as to be displaceable in the focus direction which is the normal direction of the optical card 11 and the tracking direction which is orthogonal to the focus direction and the track direction of the optical card 11. It is supported by the part 15a.

The slider 15 is made of a magnetic material and has a third
As shown in detail in the drawing, the focus coil 12 extending parallel to the wall 2d is sandwiched between both side walls 2b and 2c of the holding member 2 and one vertical coil portion of each of the tracking coils 13a and 13b mounted thereon. The U-shaped yoke portion 15c that sandwiches the focus coil 12 extending in parallel with the U-shaped yoke portion 15b and the wall 2e and the vertical coil portion of each of the tracking coils 13c and 13d mounted thereon is integrally formed. The focus coil 12 and the tracking coils 13a to 13d are formed by mounting the permanent magnets 16a and 16b on the inner side surfaces of the outer rising portions that form the yoke portions 15b and 15c.
To generate a magnetic flux that crosses. As described above, by arranging only the coil inside each of the yoke portions 15b and 15c, the interval can be narrowed and the magnetic force of the permanent magnets 16a and 16b can be effectively used. For example, if the distance between the yoke parts 15b and 15c is changed from 2 mm to 1.5 mm, the magnetic force will be 1.8
Double. Therefore, small and inexpensive permanent magnets 16a and 16b can be used, and the yoke portions 15b and
The 15c can also be made small. On the other hand, if the wall of the holding member is also positioned inside the U-shaped yoke portion, the yoke spacing is widened by the thickness thereof, and the magnetic force is reduced.

The slider 15 is slidably attached to a guide shaft 18a extending in a direction orthogonal to the track direction of the optical card 11 via a bearing 17 at a rising portion 15a at one end, and the other end is integrally formed. The formed U-shaped engaging portion 15d is slidably engaged with the guide shaft 18b that extends parallel to the guide shaft 18a. Further, since the slider 15 is moved in the direction orthogonal to the track direction of the optical card 11,
Pin 15e is formed integrally with 15 and this pin 15e is used as a guide shaft.
It is engaged with a screw screw 19 extending parallel to 18a, 18b. In this way, the screw 15 is rotated in the forward and reverse directions by the motor (not shown), and the slider 15 is moved in the direction orthogonal to the track direction of the optical card 11.

FIG. 4 shows an example of the structure of the optical card 11.
This optical card 11 has a read-only area (RO
An M part) 22 and a data writing area (DRAW part) 23 are continuously provided in the card width direction.

Although the ROM section 22 and the DRAW section 23 each have a plurality of tracks along the longitudinal direction of the card, the ROM section 22 has a read-only portion in the entire area, whereas the DRAW section 23 has a clock section as described later. , A read-only portion such as a track number portion, and a data writing portion for actually writing data.

On the surface of the optical card 11, the ROM section 22 and the DRAW section 2 described above are
In addition to 3, the read / write device is provided with read-only high-reflectance card detection marks 24a and 24b that are detected by the photo reflector of the read / write device in order to control the conveyance of the optical card 11. In order to control the movement of the recording / reproducing head 1 in the / writing device, a read-only high reflectance head start detection mark 24c and a low reflectance track end detection mark 24d which are detected by the head are provided.

In this example, the ROM section 22 and the DRAW section 23 are provided with seek sections 25a and 25b having track numbers for searching for a desired track at both ends in the card longitudinal direction.

In this way, as shown in FIG. 5A, the card reflectors 26a, 26b of the read / write device detect the card detection marks 24a, 24b, and the photoreflectors 26a, 26b are detected.
Based on the output of (1), the drive of a card transport motor (not shown) is controlled to rotate the transport rollers 27a and 27b, thereby controlling the transport of the optical card 11. That is, as shown in FIG. 5B, the optical card 11 is inserted into the read / write device, and the photoreflector 26a detects the tip of the card detection mark 24a to drive the card conveying motor to automatically load the optical card 11. At the same time, as shown in FIG. 5C, the photoreflector 26a detects the rear end of the card detection mark 24a to temporarily stop the card conveyance. In this state, the recording / reproducing head 1 indicated by an X mark is in the ROM section 2
2 and seek section 2 including the track number section of DRAW section 23, etc.
The head start detection mark 24 formed at the position 5a in this state in contact with the head track of the ROM section 22 by the head 1
When c is detected, the head 1 is scanned in the seek portion 25a in a direction orthogonal to the track to search for a desired track.
The track end detection mark 24d formed in contact with the final track of the DRAW section 23 indicates the end of the track, and when the head 1 detects this, the movement in the track direction is stopped. In addition, the card detection mark 24b
Is for detecting the end of scanning of one track by the head 1, and the photoreflector 26a detects the card detection mark 24b as shown in FIG. In this state, the recording / reproducing head 1 is located at the seek portion 25b, and in this state, a desired track can be searched again.

FIG. 6 shows an example of a track format in the ROM section 22 and the DRAW section 23 described above. One track 31 is composed of a seek portion 25a at the head portion, a data portion 32 and a seek portion 25b following the seek portion 25a. Seek section 2
The reference numeral 5b is similar to the seek portion 25a, so that the illustration thereof is omitted. In this example, one track 16 is equally divided into 20 lines, and a clock unit for clock generation, focus error detection, and tracking error detection, which consists of black patterns at even intervals on the 10th line counting from above. 33 is formed so as to extend over the seek portion 25a, the data portion 32, and the seek portion 25b. In this example, in the seek units 25a and 25b, in order to widen the detection range of the tracking error signal,
In a part thereof, the width of the black pattern is made slightly larger than the width of the black pattern in the data section 32.

In the seek section 25a, 1 to 5 lines and 15
The .about.17 lines are used as the track number portion 34 to form a pattern representing the track number, and the 6 to 14 lines are used as the pattern recognition portion 35 to form a pattern for recognizing the track number. In this example, lines 1 to 9 and lines 11 to 20 are all white in the 0th track, 1 line is the track number part 34 in the first track is black, and 6 out of the 6 to 14 lines are the pattern recognition part 35. The 14th line and 14th line are black and the others are white, and the pattern is recognized so that the track number portion 34 is read. Only the pattern in the track number portion 34 is made different in the second and subsequent tracks. The 18th and 19th lines of each track are the recording confirmation section 36 used in the DRAW section 23. When both lines are white, it indicates that the track is in an unrecorded state. After finishing, set the 19th line to black to indicate that it has been recorded. In the data section 32, a black frame sync line 37 for detecting a frame sync signal is formed on 20 lines.

Thus, in this example, the data portion 32 of each track is
1 to 8 lines above the clock section 33 and 12 to 19 lines below constitute a byte consisting of 8 bits each, and the ROM section 22 has a total of 1 for each track.
Reads 6 lines of data, and 1 in DRAW section 23
Data is written to a total of 16 lines for the track, and the written data is read as required. In addition,
Whether the track is the ROM section 22 or the DRAW section 23 is recorded in the 0-track data section 32. Further, in this embodiment, the read-only portions of the ROM section 22 and the DRAW section 23 are binary data "0" on the card substrate and a low reflectance material forming the background portion, and binary data "1". The DRAW part is made up of a high-reflectivity metal reflective film such as Al.
The data writing portion of 23 has a low reflectance material that constitutes the background portion and a high reflectance that represents “1” of the binary data, and by writing light (first light) irradiation, the binary data “ The recording medium is composed of a gelatin layer or the like having a silver-based coloring agent having a low reflectance representing "0", and the reflectance of "1" of the binary data in the read-only portion is that of the binary data in the data writing portion. It is higher than the reflectance of "1".

FIG. 7 shows a structure of the photodetector 7 shown in FIGS. 1A to 1C and a structure of a main part of its signal processing circuit. The photodetector 7 includes light receiving regions 41-1 to 41-17 arranged in the width direction of the track corresponding to 1 to 8 lines and 12 to 20 lines of the track, and tracks corresponding to the black pattern of the clock unit 33. 4 pairs of light receiving regions 42-1 to 42-8 for clock generation arranged in the direction, and a clock unit
A pair of tracking light-receiving regions 43-1 and 43-2 arranged in the track width direction so as to be able to receive images of a plurality of black patterns of 33, and a plurality of black patterns of the clock unit 33 similarly. And a pair of focusing light receiving regions 44-1 and 44-2 which are arranged apart from each other in the track direction so that the respective images can be received.

The outputs of the light receiving areas 41-1 to 41-17 are AV converters 45-1 to 45.
After voltage conversion by -17, comparators 46-1 to 46-
It is binarized by 17 and supplied to the signal processing circuit 47. The light receiving regions 42-1 to 42-8 for clock generation are the light receiving regions 42-1, 42.
The sum of the outputs of −3, 42−5, 42−7 and the light receiving areas 42−2, 42−4,
The sum of the outputs of 42-6 and 42-8 and the AV converter 45-18 and 4
After voltage conversion by 5-19, it is supplied to the comparator 46-18 to obtain a clock signal, which is supplied to the control circuit 48.
Further, the outputs of the tracking light receiving regions 43-1 and 43-2 are
The voltage is converted by the AV converters 45-20 and 45-21 and then supplied to the operational amplifier 49-1 to obtain a tracking error signal. This tracking error signal is supplied to the drive circuit 51-1 via the switching circuit 50-1 under the control of the control circuit 48, and the drive circuit 51-1 supplies a current corresponding to the tracking error signal to the tracking coils 13a to 13d. Tracking control is performed so that the tracking error signal is supplied to zero. In addition, the light receiving areas for focusing 44-1, 44-
The outputs of 2 are subjected to voltage conversion by AV converters 45-22 and 45-23, respectively, and then supplied to a differential amplifier 49-2 to obtain a focus error signal. This focus error signal is supplied to the drive circuit 51-2 through the switching circuit 50-2 under the control of the control circuit 48 similarly to the tracking error signal, and the drive circuit 51-2 supplies a current corresponding to the focus error signal. Is supplied to the focus coil 12 to perform focus control so that the focus error signal becomes zero.

In this embodiment, the light emitting diode 3 described above spot-illuminates the track of the optical card 11 via the mirror 9 and the lens 4, and the image thereof is passed through the lens 5 and the mirror 6 and then on the photodetector 7 by the reference numeral 52 in FIG. The image is formed as shown in (4), and the outputs of the comparators 46-1 to 46-17 corresponding to the outputs of the light receiving areas 41-1 to 41-17 are synchronized with the clock signal and signaled under the control of the control circuit 48. It is taken into the processing circuit 47 and a reproduced signal of data is obtained. Further, when writing data, the laser drive control circuit 53 and the bimorph drive circuit 54 are driven under the control of the control circuit 48 while the light emitting diode 3 similarly illuminates the track, and the semiconductor laser 8 does not write data. A possible second light is generated, and the second light is scanned in the track width direction in the track portion corresponding to the light receiving regions 41-1 to 41-17 by the displacement of the mirror 9 by driving the bimorph 10. In addition, during the scanning, the signal processing circuit 47 obtains the synchronizing signal of the line corresponding to the track based on the outputs of the light receiving areas 41-1 to 41-17, and the data to be written from the data source 55 by this synchronizing signal. Is read, and based on this, the laser drive control circuit 53 is controlled to selectively generate writable first light from the semiconductor laser 8 to write data. The spot diameter of the laser light projected from the semiconductor laser 8 onto the optical card 11 is approximately one line width of the track.

Here, as described above, the reflectance of the binary data “1” in the ROM section 22 of the optical card 11 is higher than the reflectance of the binary data “1” in the data writing section of the DRAW section 23.
Therefore, when reading data by irradiating only the illumination light from the light emitting diode 3, the output current i ₁ of the light receiving areas 41-1 to 41-17 in the ROM section 22 when the binary data is “1” is the DRAW section. It becomes larger than the output current i ₂ of the binary data “1” in the data writing portion of 23. In addition, since the second light is projected from the semiconductor laser 8 in addition to the illumination light from the light emitting diode 3 at the time of writing data, the output current i ₃ when the reflected light of both is received is more than i ₁ . Is also extremely large, and there is a relationship of i ₃ >> i ₁ > i ₂ .

Therefore, in this embodiment, the binary data can be accurately read by the illumination light from the light emitting diode 3 in the ROM 22 and the DRAW unit 23, and when the data is written in the DRAW unit 23, the data from the light emitting diode 3 is read. In order to obtain an accurate synchronization signal with the illumination light and the second light from the semiconductor laser 8, the threshold voltages of the comparators 46-1 to 46-17 are set according to each case. For this reason,
A resistor 56-for setting the threshold voltage for reading the ROM section 22-
1. A resistor that sets the threshold voltage for reading the DRAW section 23
56-2 and the resistor 56-3 for setting the threshold voltage at the time of writing data to the DRAW section 23, the comparators 46-1 to 46-
The switching transistors 57-1 to 57-3 are respectively connected between the inverting input terminal for inputting the threshold voltage of 17 and the voltage source.
These transistors 57-1 to 57 are connected in parallel via
-3 is selected under the control of the control circuit 48 via the drive circuit 58 in accordance with each case to make it conductive, thereby switching the threshold voltage.

Further, the amount of emitted light of the semiconductor laser 8 changes depending on the temperature change. Therefore, in this embodiment, the light receiving region 41-
The output of 17 is supplied to the AD converter 59, and this is A / D converted based on the output of the comparator 46-17 in the data writing mode in which the semiconductor laser 8 is emitting the second light, and the light amount is corrected. The signal is supplied to the signal generation circuit 60, where it is compared with a reference value corresponding to a predetermined light amount to obtain a light amount correction signal, and this light amount correction signal is supplied to the laser drive control circuit 53 to control the drive current of the semiconductor laser 8. As a result, the semiconductor laser 8 is caused to generate a predetermined amount of light of the first and second lights, respectively. Note that this light amount correction is performed by the DRAW unit 23 in which 20 lines of the track are white, that is, a portion which constitutes “1” of the binary data, for example, the seek unit 25a outputs the second light 2
This is done by projecting on line 0.

Thus, in this embodiment, the ROM section 22 and the DRA
When reading the data in the W section 23, the comparator 46
Set the threshold voltage of -1 to 46-17 to a predetermined value,
Illumination light is projected from the light emitting diode 3 to perform tracking control and focus control, while receiving light receiving regions 41-1 to 41-1.
The reproduced signal is obtained based on the output of 41--17. Also, the DRAW section
Similarly, when writing data to 23, the comparator
While setting the threshold voltages of 46-1 to 46-17 to corresponding values and projecting illumination light from the light emitting diode 3 to perform tracking control and focus control, first, the semiconductor laser 8
The second light from is driven by driving the bimorph 10 through the bimorph drive circuit 54 and swinging the mirror 9 to scan up to 20 lines of the track, and the light amount is corrected based on the output of the light receiving area 41-17. Then, by scanning the second light over the 1st to 19th lines of the track, in synchronization with the synchronizing signals respectively obtained based on the outputs of the light receiving regions 41-1 to 41-16 corresponding to the respective lines, According to the data to be written, the semiconductor laser 8 selectively emits the first light to write the data. That is, when the binary data “1” is written in the line corresponding to the light receiving area at the time when the synchronization signal is obtained, the output light of the semiconductor laser 8 is left as it is as the binary light “0”. When writing ", output light first
As the light of, the reflectance of that part is lowered. In this way, when writing of data to lines 1 to 19 is completed at a certain clock signal generation position, the mirror 9 is initialized via the bimorph drive circuit 54 and the bimorph 10 by a synchronizing signal based on the output of the light receiving region 41-16. The position is set, and data is written in the same manner at the next clock signal generation position.

In this way, by scanning the second light from the semiconductor laser 8 to obtain the synchronization signal corresponding to each line of the track and writing the data based on this, even if the bimorph 10 has hysteresis, each line is accurately recorded. You can write data to.

Further, in the above-described embodiment, since the size of the black pattern forming the clock unit 33 is partially increased in the seek unit 25a, the detection range of the tracking error signal is widened during the seek for detecting the track number, and Seeks can be performed quickly.

Incidentally, in the seek of the track number, after the reading of a certain track is completed, that is, when the photo reflector 26a detects the card detection mark 24b, the card transport motor is stopped for a predetermined time and the tracking control drive circuit.
The operation of 51-1 is stopped, the head 1 is moved in the next track direction at the seek portion 25b, and the drive circuit 51-1 is operated when a predetermined time has elapsed thereafter. You can move to the next track. Further, the standby position of the head 1 with respect to the optical card 11 can be set to a substantially intermediate track position.
By doing so, the seek distance can be shortened when reading data randomly as in a dictionary, and the access time can be shortened.

Although the seek portions 25a and 25b have the same pattern in the above-described embodiment, the seek portion 25b may be only the clock portion or may be omitted. Furthermore, the present invention can be effectively applied not only to the above-mentioned optical card, but also to the case where an optical disk or another optical recording medium is used.

〔The invention's effect〕

As described above, according to the present invention, since the data is written in a plurality of lines for one track, the recording density for one track of the recording medium can be increased and the head and the recording medium can be read in reading the data. The recorded data can be reproduced at high speed even if the relative movement speed of the recording medium is not increased, and thus even with a low-cost reproducing device.

[Brief description of drawings]

1A to 1C are views showing the main part of one embodiment of the present invention, FIG. 2 is a partial detailed view of the optical system shown in FIG. 1, and FIG. 3 shows the structure of the slider shown in FIG. FIG. 4 is a perspective view, FIG. 4 is a diagram showing an example of the configuration of an optical card, FIGS. 5A to 5D are diagrams for explaining the operation when the optical card shown in FIG. 4 is used, and FIG. 6 is FIG. FIG. 7 is a diagram showing an example of a track format of the optical card shown in FIG. 7, and FIG. 7 is a diagram showing a configuration of a main part of an example of a signal processing circuit. 1 ... Recording / reproducing head, 2 ... Holding member 3 ... Light emitting diode, 4,5 ... Lens 6 ... Mirror, 7 ... Photodetector 8 ... Semiconductor laser, 9 ... Mirror 10 ... Bimorph, 11 ...... Optical card 12 ...... Focus coil 13a to 13d ...... Tracking coil 14a to 14d ...... Linear elastic support member 15 ...... Slider, 15b, 15c ...... Yoke part 16a, 16b ...... Permanent magnet, 17 ...... Bearing 18a, 18b …… Guide shaft, 19 …… Screw screw 22 …… ROM section, 23 …… DRAW section 24a, 24b …… Card detection mark 24c …… Head start detection mark 24d …… Track end detection mark 25a, 25b… … Seek section 26a, 26b …… Photo reflector 27a, 27b …… Conveying roller 31 …… Track, 32 …… Data section 33 …… Clock section, 34 …… Track number section 35 …… Pattern recognition section, 36 …… Record Confirmation unit 37 ... Frame synchronization lines 41-1 to 41-17 ... Areas 42-1 to 42-8 ... light receiving area for clock generation 43-1, 43-2 ... light receiving area for tracking 44-1, 44-2 ... light receiving area for focus 45-1 to 45-22 ... AV converters 46-1 to 46-18 ... Comparator 47 ... Signal processing circuit, 48 ... Control circuit 49-1, 49-2 ... Differential amplifier 50-1, 50-2 ... Switching circuit 51- 1,51-2 ...... Drive circuit 52 ...... Spot image 53 ...... Laser drive control circuit 54 ...... Bimorph drive circuit 55 ...... Data source 56-1 to 56-3 ...... Resistance 57-1 to 57-3 ... Switching transistor 58 Driving circuit 59 A / D converter 60 Light intensity correction signal generation circuit

Claims (1)

(57) [Claims] 1. A means for illuminating an optical recording medium, and a track corresponding to one track of the optical recording medium so as to receive reflected light of the illumination light by the illuminating means on the optical recording medium. A plurality of light receiving elements arranged in a direction orthogonal to the light source, a light source that selectively emits first light that can optically write information and second light that cannot be written, and light from this light source. Scanning means for scanning the illuminated area on the optical recording medium by the illuminating means in a direction orthogonal to the track, and the illuminating light and the second light on the light receiving element based on the output of each of the light receiving elements. The illumination means includes means for detecting incidence of light and control means for controlling the light source to selectively project the first light on the optical recording medium based on the output of the detection means. By the optical description While illuminating the recording medium, the second light is emitted from the light source and is scanned by the scanning means in the direction orthogonal to the track, while the light source is transmitted via the control means based on the output of the detection means. An optical information recording device, characterized in that information can be recorded in a plurality of lines on each track of the optical recording medium by selectively emitting the first light from the optical recording medium.