JP2002367173A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To clearly record a visualized picture so as not to lower the recording quality of data already recorded on a recordable optical disk. SOLUTION: Picture encode data consisting of a pit and a space longer than reproducible data are produced by a picture encoder 17 on the basis of picture data, and the emission and the stop of a laser beam by an optical pickup 5 are controlled with an LD control part 15 on the basis of the picture encode data, then the long pit and space are formed by a CPU 16 at places on the data recorded surface, where the reproducible data are not recorded yet, so that the visible picture visualized by the difference of the light reflectance between these long pit and space is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an optical disk recording apparatus that draws characters and figures on a data recording surface of an optical disk such as a RW and a DVD, mainly an optical disk not sealed in a cartridge.

[0002]

2. Description of the Related Art CD-Rs represented by write-once optical disks have rapidly become widespread as the cost of optical disk recording devices and media has been reduced. The reason is that CD-Rs are now standard on personal computers (PCs).
This is because it is very convenient to record a large amount of data that cannot be recorded on a floppy (registered trademark) disk and transfer it to the outside, since it can be reproduced by a ROM drive. Also, music lovers can create original music CDs using CD-Rs, which is a very attractive media. In particular, a recent CD-R drive has a high data writing speed and can create a large amount of data-recorded CD-R in a short period of time. The demand is rising, and it is not uncommon for one person to own hundreds of CD-Rs.

As described above, when a large number of CD-Rs are owned, it is necessary to identify and organize each disk. In the stamp CD which is a pre-recorded data recording medium,
The label surface is printed, so that the disc can be easily identified and the recorded content can be easily determined. For example, JP-A-5-65
No. 76 discloses an optical disk in which a mark that can be viewed by the presence or absence of a pit is formed, and a method of manufacturing the optical disk.
Further, Japanese Patent Application Laid-Open No. H11-213455 discloses an optical disk in which visible marks are formed by increasing the pit width of a specific pit length among reproducible data pits. However, since the CD-R is for the user to write data, the label surface is plain or only the brand design is printed. It is impossible to judge.

Therefore, in the case of a CD-R, a user usually writes data, and then writes a disk title by hand on a label surface with an oil-based pen. However, in this case, an oil-based pen is required, and the handwritten appearance is disadvantageous. In addition, there are a method of printing and sticking on a CD-R exclusive label, and a method of directly printing on a printable CD-R with a special printer. According to these methods, a full-color beautiful label can be created. However, there is a problem that data loss occurs due to peeling of the data recording layer together with the label, and the latter is not an easy and inexpensive method because printable media and a dedicated printer are expensive.

[0005] From such a background, there is a demand for a method for a user to write a title or data content on an optical disk without using a pen or a printer. The CD-R records reproducible data by forming pits by deforming a recording film and a substrate with an intense laser beam. And
The recorded data is read out by a change in reflected light that returns with a weak laser beam. The change in the reflected light is strongly responsive to the wavelength of the laser beam, but the pit also changes the reflectance in visible light, so the color changes between the part where data is recorded and the part where data is not recorded. It looks like In the case of the stamp CD, the image formed by the stamp on the recording surface has a small change in reflectance, so that a practical contrast cannot be obtained.
The change in the color of the data recording portion can provide a sufficient contrast for visual observation.

That is, if an image such as a character or a mark is recorded by a pit using a track on a data recording surface of a CD-R as a scanning line, the character or mark becomes visible.
Therefore, conventionally, an optical disk recording apparatus (for example, see Japanese Patent Application Laid-Open No. H11-134648) that prevents a reduction in the amount of recorded data by forming a visible image by overlapping the already recorded data on the data recording surface of a recordable optical disk, ,
There has been proposed an optical disk recording apparatus that forms a visible image by changing a pit width on data recording surface of a recordable optical disk with data obtained by converting rectangular coordinates into polar coordinates (for example, see Japanese Patent Application Laid-Open No. H11-134648). .

[0007]

However, in the above-described conventional optical disk recording apparatus, when a visible image is overlapped with the already recorded data on the optical disk, the pit width is changed by the data obtained by converting the rectangular coordinates into polar coordinates. Even if it is changed, not only is it difficult to maintain the recording quality of the already recorded data, but also it is difficult to obtain the contrast required for visual observation. The present invention has been made to solve the above problems, and has as its object to enable clear recording of a visible image so as not to lower the recording quality of data already recorded on a recordable optical disk. And

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention reproduces data by irradiating a data recording surface of an exchangeable optical disk with a laser beam generated from an optical pickup to form pits and spaces. In an optical disc recording apparatus for recording possible data, image encoded data generating means for generating image encoded data comprising pits and spaces longer than the reproducible data based on the image data, and the image encoded data generating means Laser beam irradiation / stop control means for controlling the irradiation and stop of the laser beam by the optical pickup based on the generated image encoding data; and the laser on the data recording surface where the reproducible data is not recorded. Control of laser beam irradiation and stop by beam irradiation / stop control means By by forming a the long pits and spaces, is provided with a visible image recording control means for recording the visible image becomes visible by the difference in reflectance of light with its long pits and spaces.

In the above optical disk recording apparatus, the amplification rate of the servo error signal of the optical pickup is adjusted in accordance with the amount of the laser beam which changes during the recording of the visible image, and the length of the long pit is reduced. It is preferable to provide an optical pickup control means for stably performing servo control of the optical pickup even when a space is formed. Further, in the optical disk recording apparatus as described above, at the time of recording the visible image, a constant angular velocity rotation control for rotating the optical disk at a constant angular velocity such that a track for one round of the optical disk corresponds to a horizontal scanning line of orthogonal coordinates. Means may be provided.

In the above optical disk recording apparatus, a laser beam irradiation light amount control means for changing the irradiation light amount of the laser beam by the optical pickup in a stepwise manner, and a laser light irradiation light amount by the laser beam irradiation light amount control means. It is preferable to provide a gray-scale image recording control means for changing the width and depth of the long pits to control the gray level of the visible image. Further, in the optical disk recording apparatus as described above, means for forming one pixel of the image data by a plurality of tracks, and expressing a multi-value of the pixel by the number and arrangement of pit tracks; It is preferable to provide a gray-scale image recording control means for applying a multi-level gray scale using a binary recording system.

In the above-mentioned optical disk recording apparatus, a recorded area for judging whether or not the area is a recorded area of the reproducible data on the data recording surface based on TOC, PMA or RMA information of the optical disk. It is preferable that a determination unit is provided, and the visible image is recorded in a place where the reproducible data is not recorded based on a determination result of the recorded area determination unit. Further, in the above-described optical disk recording device, the TO
An optical disc that is not recordable based on information of C, PMA or RMA, and is provided with a non-recordable area determining means for determining a non-recordable area on a data recording surface thereof. The visible image may be recorded in the non-recordable area as an unrecorded location of the reproducible data based on the reproducible data.

In the optical disk recording apparatus as described above, after recording the visible image, the P on the data recording surface may be changed.
Means for recording information indicating the recording area of the visible image in the MA or RMA may be provided. Further, in the optical disk recording device as described above, the optical disk recording device has a CPU having a clock synchronous serial data output circuit built therein, and the firmware of the CPU uses the image encoded data generating means to perform the reproduction of the data based on the image data. It is preferable to generate image encoded data composed of long pits and spaces.

In the above optical disk recording apparatus, it is preferable that the optical disk is rotated in synchronization with a clock output from the clock synchronous serial data output circuit to record the visible image.
Further, the optical disk recording apparatus as described above has PLL clock output means for outputting a clock with respect to the FG pulse of the spindle motor for rotating the optical disk, and in synchronization with the clock output by the PLL clock output means. The visible image may be recorded based on the output serial data.

[0014]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an optical disk recording apparatus according to an embodiment of the present invention. Note that arrows indicate typical flows of signals and data, and do not indicate all connection relationships between blocks. This optical disk recording device has a CPU, a ROM,
And an information recording processing device such as a CD-R drive realized by a microcomputer including a RAM and the like. The optical disk 20 is a recordable medium such as a CD-R, and is driven to rotate at a predetermined speed by the spindle motor 1. The rotation of the spindle motor 1 is controlled by the motor driver / servo processing unit 2 so that the linear velocity is constant or the angular velocity is constant. This linear velocity or angular velocity can be changed stepwise.

The optical pickup 5 includes a well-known semiconductor laser (not shown), an optical system, a focus actuator,
A track actuator, a light receiving element, a position sensor, and the like are built-in, and a laser beam is generated and irradiated on the optical disc 20, and pits and spaces are formed on the optical disc 20 to record or reproduce data. A unit for reading reproducible data. The optical pickup 5 can be moved with respect to the data recording surface of the optical disc 20 by a known seek motor (not shown). These focus actuators, track actuators, and seek motors use a motor driver / servo processing unit 2 to process a laser spot of a laser beam on a target location (recording location) Or the playback position).

In the case of data reading from the data recording surface,
The reproduced signal obtained by the optical pickup 5 is read
, And then input to the CD decoder 7 for deinterleaving and error correction. Subsequently, this data is input to the CD-ROM decoder 8 and subjected to error correction processing to further improve the reliability of the data. Thereafter, the data is temporarily stored in a buffer memory (buffer RAM) by the buffer memory manager 9.
When the data is stored as sector data and sent to the host computer via the host interface (I / F) 11, the data is sent at once.

In the case of writing data to the data recording surface, data sent from the host computer through the host I / F 11 is temporarily stored in the buffer memory 10 by the buffer memory manager 9. Buffer memory 1
Writing starts when a certain amount of data is accumulated in 0, but before that, the laser spot must be positioned at the writing start point. This point is obtained based on a wobble signal that has been engraved on the optical disc 20 in advance by meandering of the track. ATI is included in the wobble signal.
It contains absolute time information called P, and the ATIP decoder 12 can extract this absolute time information.

The synchronization signal generated by the ATIP decoder 12 is input to the CD encoder 13 to enable writing of data at an accurate position. The data in the buffer memory 10 is subjected to error correction code addition and interleaving by a CD-ROM encoder 14 and a CD encoder 13, output as a signal modulated to a recording EFM from the CD encoder 13, and output to the LD control unit 15. Pits are recorded on the optical disk 20 by the laser beam controlled by the optical pickup 5. The LD control unit 15 emits a laser beam at a write power in accordance with the recording EFM, and constantly controls the light emission state so that appropriate recording and reproduction can be performed.

Next, a recording process of a visible image according to the present invention will be described. The image data sent from the host computer is temporarily stored in the buffer memory 10 through the host I / F 11 and the buffer memory manager 9. When all the image data has been received, or when a predetermined amount of image data has been received, recording of the visible image starts, but if the image data has not been received, the image from the host computer is also recorded during the recording of the visible image. Continue receiving data. The system controller (CPU) 16 activates the spindle motor 1 and the image encoder 17, and moves the optical pickup 5 to a location designated by the host computer (a location where a visible image is recorded). The motor driver / servo processing unit 2 uses the ATIP
The CLV control unit 3 rotates the spindle motor 1 at a constant linear speed in accordance with the synchronization signal output from the decoder 12.

The image encoder 17 generates image encoded data composed of pits and spaces longer than the reproducible data based on the image data.
Irradiates or stops a laser beam of a predetermined write power on the optical disc 20 in accordance with the pit signal of the image encode data. Thus, the system controller 16
Thus, by controlling the irradiation and stop of the laser beam, long pits and spaces are formed in an area of the data recording surface of the optical disc 20 where no reproducible data is recorded, and the light reflectance of the long pits and spaces is formed. A visible image that can be visually recognized due to the difference is recorded. When a physical pit is formed on the data recording surface of the optical disc 20, the reflectance of that portion changes, so that an image such as a character or a mark composed of a set of pits can be recorded as a clear visible image. .

That is, the function of the image encoded data generating means for generating image encoded data composed of pits and spaces longer than the data that can be reproduced by the image encoder 17 based on the image data is performed by the LD control unit 15. Laser beam irradiation for controlling the irradiation and stop of the laser beam by the optical pickup based on the image encoding data generated by the encoding data generating means.
The function of the stop control means is controlled by the system controller 16
And the like, on the data recording surface where the reproducible data is not recorded, to form long pits and spaces by controlling the irradiation and stop of the laser beam by the laser beam irradiation / stop control means. And a function of a visible image recording control means for recording a visible image that can be viewed by a difference in light reflectance between the two.

Here, when an image is recorded using a track as a horizontal scanning line of orthogonal coordinates, the physical positional relationship with an adjacent track is important. The ATIP of the CD-R is recorded in CLV, and when an image is recorded based on this signal, complicated coordinate calculation and correction processing are required. If this processing is performed by the host computer, the load on the optical disk recording apparatus is reduced, but correction beyond the recording resolution is impossible, and as a result, image data may increase or image quality may deteriorate. Therefore, in order to easily solve these problems, it is preferable to record a visible image by CAV control.

First, a system controller (CPU) 1
Reference numeral 6 activates the spindle motor 1 and the image encoder 17 to move the optical pickup 5 to a location designated by the host computer (a location where a visible image is recorded). In the motor driver / servo processing unit 2, the CAV control unit 4 rotates the spindle motor 1 at a constant angular speed according to the reference signal output from the image encoder 17. CAV control unit 4
Compares the reference signal output from the image encoder 17 with the FG signal output from the spindle motor 1, and performs accurate rotation control synchronized with the image data. That is,
The CAV control unit 4 and the image encoder 17 function as a constant angular velocity rotation control means for rotating the optical disc at a constant angular velocity so that a track for one round of the optical disc corresponds to a horizontal scanning line of orthogonal coordinates when a visible image is recorded. Fulfill.

The image encoder 17 generates image encoded data composed of pits and spaces longer than reproducible data based on the image data, and uses the FG signal of the spindle motor 1 to generate data for one line of the image. Are sent to the LD controller 15 and the read amplifier 6 in synchronization with each other so that the start positions always have the same rotation angle. Since the synchronization performance greatly affects image quality, it is more preferable to increase the number of FG pulses or to provide a dedicated index pulse circuit. Also, the image data may have a specification of about half a round instead of one round of one line. The LD control unit 15 irradiates or stops a laser beam of a predetermined write power on the optical disc 20 according to the pit signal of the image encoded data.

In this way, the system controller 16 forms long pits and spaces on the data recording surface of the optical disc 20 where the reproducible data is not recorded by controlling the irradiation and stop of the laser beam. A visible image that can be visually recognized by a difference in light reflectance between the pit and the space is recorded. When a physical pit is formed on the data recording surface of the optical disc 20, the reflectance of that portion changes, so that a clear visible image can be recorded by a set of pits. In this way, the user can visually record the disc title and disc contents on the optical disc without using the pen or the printer, and the quality of the recorded data is not degraded.

Here, the laser beam is controlled by a track servo so as not to protrude from a groove of an optical disk called a track, and is controlled by a focus servo to form a spot on a recording film by focusing. Since the error signal required for the servo control is generated from the reflected light of the laser beam, if the amount of the emitted laser beam changes, the amplitude of the error signal changes, which affects the servo control. In order to cope with this problem, the amplification factor of the error signal is switched during recording and during reproduction in which the emitted light amount of the laser beam greatly changes. When the data recording is viewed in detail, the light amount changes greatly even in the pits and spaces, but since the cycle is sufficiently shorter than the servo band, this does not cause a serious problem.

However, it is conceivable that pits will continue in the recording of a visible image, and servo control may not be performed properly unless switching is performed even during the recording. Therefore, the pit data is also sent to the read amplifier 6,
The amplification degree of the error signal necessary for servo control of the actuator may be adjusted by the system controller 16 in accordance with the increase in the amount of reflected light due to the write power. That is,
The system controller 16 adjusts the amplification factor of the servo error signal of the optical pickup 5 in accordance with the amount of the laser beam that changes during the recording of the visible image, and controls the servo of the optical pickup 5 even when long pits and spaces are formed. Performs a function of an optical pickup control means for stably performing the operation. In this way, it is possible to stabilize the servo control when recording the visible image on the optical disc and improve the recording accuracy of the pits forming the visible image.

FIG. 2 is an image diagram of a visible image formed on the recording surface of the optical disk. FIG. 3 is an image diagram showing the visible image portion in an enlarged manner. As shown in FIG.
In the case of a CD-R, since data is recorded from the inner circumference, the inner circumference is a recording area 40 where reproducible data is recorded, and the outer circumference is an unrecorded area 41. This unrecorded area 4
The visible image 42 is recorded in the portion 1. In this case, if data capable of reproducing data is recorded to fill the recording capacity of the CD-R, a visible image can hardly be recorded, but normal data is rarely recorded to fill the data recording surface. Often, only a small amount of data is written to It is also possible to reduce the amount of recording data for image recording. The visible image is recorded by a scanning line method, and a track for one round of a disk becomes a scanning line. The length of the scanning line differs between the inner circumference and the outer circumference, and an arc is drawn. Therefore, if bit data of orthogonal coordinates is drawn as it is, the scanning line will be deformed. However, characters and the like can be sufficiently read.

FIG. 3 shows an example in which 12 are drawn with pits. In the case of a CD-R, the track pitch is as narrow as 1.6 μm, so that it is difficult to read the numbers drawn with 10 tracks with the naked eye. Therefore, it is good to form it with 10 or more tracks. That is, a visible image can be formed by recording the bit data in the orthogonal coordinate system as it is. In this way, for example, by forming a pit sequence of a visible image in an area of a surplus portion after writing data, a visible image can be recorded in a place different from recording data on a data recording surface of an optical disc. There is no danger of lowering the recording quality of data such as already recorded programs, documents, music, etc., and the excess portion of the data recording surface can be used without waste. Also, since the data recording location and the visible image recording location are each independent,
A visible image can be recorded after data recording, or a visible image can be recorded on an optical disk on which data has been recorded by another optical disk recording device, and there is an advantage that the usability is good.

Next, there is a method of performing hologram processing on a label surface in order to prove the originality of an optical disc because digital data on a CD can be easily copied. The visible image recorded on the data recording surface as described above cannot be read out as data, and has the same effect as a hologram. There is. Therefore, in order to enable the visible image to be expressed in gradation, the width and depth of each pit constituting the visible image may be changed. To that end, by changing the write power of the laser beam with respect to the optical pickup 5, the width and depth of each pit can be changed. Therefore, since the reflectance changes depending on the width and depth of the pit, the visible image can be recorded with shading by adjusting the write power of the laser beam of the optical pickup 5 by the LD control unit 15. First, analog or digital multi-valued pit data is output from the image encoder 17 based on the image data, and the LD control unit 15 increases the irradiation light amount of the write power to the optical pickup 5 based on the multi-valued pit data. The optical pickup 5 irradiates the optical disc 20 by changing the light quantity of the laser beam by changing the irradiation light quantity, and makes the pit width and depth different on the data recording surface of the optical disc 20. Record the visible image.

That is, when the LD control unit 15 and the image encoder 17 record a visible image on the data recording surface, a laser beam irradiation light amount control means for changing the irradiation light amount of the laser beam by the optical pickup 5 in a stepwise manner; By controlling the irradiation light quantity of the laser beam by the light irradiation light quantity control means, it functions as a gray-scale image recording control means for changing the width and depth of a long pit to give a shade to a visible image. FIG.
FIG. 4 is an enlarged image diagram showing a visible image portion with shading. The width of each pit constituting "1" of the numeral "12" is made narrower and deeper, and the width of each pit constituting "2" is made wider and shallower. In this way, it is possible to record a complex visible image with shading by a multi-valued image, and to exert the effect of discriminating a copy.

Next, in the above-described processing, laser control for changing the width and depth of the pits requires a new circuit to be added to the conventional optical disk recording apparatus, which causes an increase in cost. . The track pitch of the CD-R is about 1.6 μm and the horizontal resolution is very high. Therefore,
Since one pixel is actually composed of 62 lines and a pixel resolution of 100 μm is sufficient,
A new circuit becomes unnecessary if the pixel is given a gradation by the number and arrangement of the lines. That is, when recording the visible image, one pixel of the image data is formed by a plurality of tracks,
The multi-value of the pixel is formed according to the number and arrangement of the pit tracks, and is recorded with multi-level shading by a binary recording method.

That is, the LD control unit 15 and the image encoder 17 form one pixel of the image data by a plurality of tracks, and express the multi-value of the pixel by the number and arrangement of the pit tracks. This functions as a gray-scale image recording control means for applying a multi-level gray scale to a visible image by a binary recording method. Thus, as described above, multi-valued pit data and multi-stage control of write power require complicated circuits, but the track pitch of the CD-R is 1.6 μm.
If one dot as a practical image resolution is composed of dozens of tracks and the density of the visible image is represented by the density of pits, a circuit is added to the binary image forming circuit. It is possible to form a complex visible image by using a multi-valued image without performing the above operation. FIG.
It is a figure which shows each image at the time of expressing the pixels 1-4 with the density of four steps of the visible image comprised by the book.

Next, it is absolutely necessary to avoid overwriting reproducible data by recording a visible image. The optical disc recording device can determine the extent of data recorded from the TOC or PMA on the data recording surface of the optical disc 20, and using that information, the visible image recording area specified by the host computer overlaps with the reproducible data area. Judgment is made to prevent writing. Further, even if an image is recorded in an unrecorded area as described above, in the case of a recordable disc, data may be recorded later in a portion where a visible image is recorded, and the data cannot be read out. In order to avoid the above-described problem, the CD-R cannot record the visible image by using the fact that the CD-R can select whether to enable or disable the additional recording when closing the session. It is better to limit to optical disks.

Further, in the case of ordinary data, track information is written in the PMA. However, if the recording area of the visible image is also written as a track in the PMA, the visible image can be easily read.
Double recording and additional recording can be prevented, and the usability is greatly improved. For this purpose, it is preferable to write information on the visible image recording area on the optical disc 20 (for example, PMA) after image recording.

FIG. 6 is a flowchart of a visible image recording process according to claims 6 to 8 of the present invention. In this process, it is determined in step (indicated by "S" in the figure) 1 whether or not an optical disc such as a CD-R is inserted into the optical disc recording apparatus, and if inserted, in step 2 the TOC is read from the data recording surface of the optical disc. , PMA. Step 3
Then, it is determined whether or not an image recording command has been received from the host computer. If the image recording command has been received, it is determined in step 4 whether or not the optical disk is recordable from the information of the TOC which has been already read. If the optical disc is recordable, the process is terminated with an error. If the optical disc is not recordable, the process proceeds to step S5.

In step 5, it is determined whether or not the image recording start position specified by the block address from the host computer is in the data recorded area based on the information of the TOC and PMA. If it is within the data recorded area, this process ends with an error, and if it is outside the data recorded area, the visible image recording process is started in step 6. When the recording of the visible image is completed, at step 7, the recording start position and the end position of the visible image are calculated, and the time information is recorded on the PMA of the optical disk with the track number following the data track. The image recording end position is calculated from the number of tracks, but a method of reading the ATIP immediately after the end of recording may be considered. That is, the system controller 16 sets the TO
C, PMA, or RMA functions as a recorded area determination unit that determines whether or not the area is a recorded area of reproducible data on the data recording surface. The visible image is recorded at the recording location.

The optical disc 20 is a non-recordable optical disc based on the information of the TOC, PMA or RMA of the optical disc 20, and functions as a non-recordable area determining means for determining a non-recordable area of the data recording surface. Based on the determination result, a visible image is recorded in a non-recordable area as an unrecorded location of reproducible data. Further, the system controller 16 and the like also function as means for recording information indicating the recording area of the visible image in the PMA or RMA of the data recording surface after the recording of the visible image. In this way, it is possible to prevent an accident that data is lost by overwriting the recorded data with the visible image. Further, it is possible to prevent an accident in which data is lost by overwriting data on a recorded visible image. Furthermore, additional writing of a visible image becomes possible.

Next, the encoding process of the image data greatly changes depending on the data format sent from the host computer. The simplest way is to have the pixel data sent at the same resolution as the recording resolution on the optical disk 20, but in this case, encoding only requires outputting the pixel data serially, and the processing by the firmware is fully possible. It is. However, the amount of image data is considerably large in terms of track density, and for high-speed recording, it is not enough to output data one bit at a time to the I / O port by firmware.

However, CPUs for most embedded devices
Has a built-in serial data output circuit, which eliminates the need for additional hardware for encoding. Also, a visible image cannot be formed unless the data output from the serial data output circuit and the spindle motor are synchronized. Therefore, control is performed so that the clock output from the clock-synchronized serial data output circuit and the FG pulse of the spindle motor 1 are phase-synchronized.

FIG. 7 is a block diagram showing a circuit configuration according to claims 9 and 10 of the present invention. Basically, if pixel data is recorded as pits, a visible image can be formed on the data recording surface of the optical disc 20. Speaking of image encoding, if data is sent from the host computer with the track pitch as the pixel resolution, only synchronization processing is sufficient,
Processing can be sufficiently performed by the CPU 16 of the optical disk recording device. Even so, it is not enough to operate the I / O port with the firmware. Therefore, as shown in FIG. 7, a clock synchronous serial data output circuit 31 built in the CPU 16 for incorporation is used.

The FG signal of the spindle motor 1 is
6, the timing at which the spindle motor 1 reaches a certain rotation angle can be known. Using this as the visible image line data output timing, the CPU 16 reads out the image data from the buffer memory 10 and outputs the clock synchronous serial data output circuit 31.
Set to. Pit data is output from the clock synchronous serial data output circuit 31, and at the same time, a data clock is output. The CAV controller 4 controls the spindle motor 1 at a constant angular velocity using the output data clock as a rotation reference signal. In this way, there is no need to provide a special image encoder in the optical disk recording apparatus, and a visible image recording function can be provided at low cost. In addition, synchronization between data and the number of rotations can be easily performed.

Next, if the FG pulse of the spindle motor 1 is used as the clock of the clock-synchronized serial data output circuit, it becomes possible to output image data synchronized with the rotation.
However, the FG pulse of the spindle motor 1 used in the optical disk recording apparatus is very small, from several shots to several tens of shots per rotation, which is far from the image resolution. Therefore, a PLL clock that is phase-synchronized with the FG pulse of the spindle motor 1 may be generated. The number of pulses of one rotation of the spindle motor 1 corresponds to the image resolution, and a visible image can be easily formed by inputting this as a clock of a clock synchronous serial data output circuit.

FIG. 8 is a block diagram showing a circuit configuration according to claim 11 of the present invention. The spindle motor 1 is controlled at a constant angular velocity not by an output data clock but by an appropriate reference signal. Although the FG signal of the spindle motor 1 is input to the counter circuit 30 and used for line synchronization as in the case of FIG. 7, the FG signal is input to the PLL oscillation circuit 32 differently. That is, the PLL oscillation circuit 3
2 functions as a PLL clock output means for outputting a clock for the FG pulse of the spindle motor for rotating the optical disk, and the CPU 16 visualizes the clock based on the serial data output in synchronization with the clock output by the PLL clock output means. Record the image. The PLL oscillation circuit 32 generates a clock synchronized with the rotation of the spindle motor 1. When this clock is input to the clock synchronous serial data output circuit 31 as a data clock, a visible image can be formed as in the case shown in FIG. In this manner, the synchronization between the image data and the rotation speed can be easily performed with high accuracy.

[0045]

As described above, according to the optical disk recording apparatus of the present invention, a visible image can be recorded clearly so as not to degrade the recording quality of data already recorded on a recordable optical disk. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disk recording device according to an embodiment of the present invention.

FIG. 2 is an image diagram of a visible image formed on a recording surface of an optical disc.

FIG. 3 is an enlarged image diagram showing a visible image portion of FIG. 2;

FIG. 4 is an image diagram showing an enlarged viewable visible image portion;

FIG. 5 is a diagram showing each image when pixels 1 to 4 are expressed in a visible image composed of 10 tracks with four levels of densities.

FIG. 6 is a flowchart of a visible image recording process according to claims 6 to 8 of the present invention.

FIG. 7 is a block diagram showing a circuit configuration according to claims 9 and 10 of the present invention.

FIG. 8 is a block diagram showing a circuit configuration according to claim 11 of the present invention.

[Explanation of symbols]

 1: Spindle motor 2: Motor driver / servo processing unit 3: CLV control unit 4: CAV control unit 5: Optical pickup 6: Read amplifier 7: CD decoder 8: CD-ROM decoder 9: Buffer memory manager 10: Buffer memory 11 : Host I / F 12: ATIP decoder 13: CD encoder 14: CD-ROM encoder 15: LD control unit 16: System controller (CPU) 17: Image encoder 20: Optical disk 30: Counter circuit 31: Clock synchronous serial data output Circuit 32: PLL oscillation circuit 40: Recorded area 41: Unrecorded area 42: Visible image

Claims (11)

[Claims] An optical disk recording apparatus for recording reproducible data by irradiating a laser beam generated from an optical pickup on a data recording surface of an exchangeable optical disk to form pits and spaces, based on image data Image encoded data generating means for generating image encoded data comprising pits and spaces longer than the reproducible data, and a laser beam by the optical pickup based on the image encoded data generated by the image encoded data generating means. Laser beam irradiation to control irradiation and stop of
Stop control means, at the unrecorded location of the reproducible data on the data recording surface, by controlling the irradiation and stop of the laser beam by the laser beam irradiation / stop control means, to form the long pits and spaces. An optical disc recording apparatus, further comprising: a visible image recording control means for recording a visible image that can be viewed by a difference in light reflectance between the long pit and the space. 2. The optical disk recording apparatus according to claim 1, wherein an amplification rate of a servo error signal of the optical pickup is adjusted according to a light amount of the laser beam that changes during recording of the visible image. An optical disc recording apparatus, comprising: an optical pickup control means for stably performing servo control of the optical pickup even when a space is formed. 3. The optical disk recording apparatus according to claim 1, wherein at the time of recording the visible image, the optical disk is rotated at a constant angular velocity such that a track for one round of the optical disk corresponds to a horizontal scanning line of rectangular coordinates. An optical disc recording apparatus provided with a constant angular velocity rotation control means for rotating. 4. The optical disk recording apparatus according to claim 1, wherein a laser beam irradiation light amount control unit that changes the irradiation light amount of the laser beam by the optical pickup in a stepwise manner, and the laser beam irradiation. An optical disc recording apparatus, comprising: a gray-scale image recording control unit for changing the width and depth of the long pits by controlling the irradiation light amount of a laser beam by a light-quantity control unit to shade the visible image. 5. The optical disc recording apparatus according to claim 1, wherein one pixel of the image data is formed by a plurality of tracks,
Means for expressing multi-values of the pixels by the number and arrangement of pit tracks; and gray-scale image recording control means for multi-level shading of the visible image by a binary recording method by the means. Optical disk recording device. 6. The optical disc recording apparatus according to claim 1, wherein a recorded area of the reproducible data on the data recording surface on the basis of information of TOC, PMA or RMA of the optical disc. A recorded area determination unit for determining whether or not the visible image is recorded in an unrecorded location of the reproducible data based on a determination result of the recorded area determination unit. Optical disk recording device. 7. The optical disc recording apparatus according to claim 1, wherein the optical disc is an optical disc that cannot be additionally recorded based on information of TOC, PMA or RMA of the optical disc, and the data recording surface thereof is additionally recorded. Providing an unrecordable area determining means for determining an unrecordable area, and recording the visible image in the unrecordable area as an unrecorded location of the reproducible data based on the determination result of the unrecordable area determining means An optical disk recording device characterized in that the recording is performed. 8. The optical disc recording apparatus according to claim 1, wherein after recording the visible image, information indicating a recording area of the visible image is recorded in PMA or RMA of the data recording surface. An optical disk recording device comprising means. 9. The optical disk recording apparatus according to claim 1, wherein a clock synchronous serial data output circuit is incorporated.
U, wherein the firmware of the CPU generates image encoded data composed of pits and spaces longer than the reproducible data based on the image data by the image encoded data generating means. Optical disk recording device. 10. The optical disk recording apparatus according to claim 9, wherein the visible image is recorded by rotating the optical disk in synchronization with a clock output by the clock synchronous serial data output circuit. Optical disk recording device. 11. The optical disk recording apparatus according to claim 9, further comprising: PLL clock output means for outputting a clock for an FG pulse of a spindle motor for rotating the optical disk, wherein the clock output by the PLL clock output means is provided. An optical disk recording apparatus for recording the visible image based on serial data output in synchronization with the optical disk.