JP2006120249A - Recording / reproducing apparatus and image recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording / reproducing apparatus capable of improving the image quality of a visible image recorded on an optical disc.
An optical pickup 4 that records or reproduces information on an information recording surface of an optical disc 51, and a spindle motor 3 that rotationally drives the information storage medium when information is recorded or reproduced on the information recording surface of the optical disc 51. And a thermal head 5 provided on the image recording surface side of the optical disc 51 and recording a visible image on the image recording surface, when recording a visible image on the image recording surface of the optical disc 51. A printing motor 6 that rotationally drives the optical disc 51 and a system controller 21 that reproduces information from the information recording surface of the optical disc 51 and controls the rotational speed of the printing motor 6 based on the reproduced signal are provided.
[Selection] Figure 2

Description

  The present invention relates to a recording / reproducing apparatus and an image recording method for recording an image on a label surface of a disk by heat.

In recent years, various types of disk-shaped media in which optical information or magnetic digital information is recorded on a disk-shaped medium have become widespread, and these are generally collectively referred to as an optical disk. As types of such optical discs, information such as music CDs, CD-ROMs, and DVDs are recorded in advance, write-once optical discs that can be written only once, and can be rewritten any number of times. There are rewritable optical disks, which are rapidly spreading.
On the other hand, a label (also called “label”) is affixed to one side of an optical disc on which information is recorded in advance for the purpose of displaying the recorded content and improving the design. Is common. For example, a music CD has a title and a song title printed on one side (label side) together with a predetermined pattern, and a recorded content is printed on the CD-ROM together with a predetermined pattern. On the other hand, a write-once optical disc and a rewritable optical disc are used so that the user himself writes desired information. Therefore, a label on which predetermined items are printed in advance cannot be added. For this reason, it is common for such type of optical disc to be able to write the recorded content in the case.
However, it is convenient if a write-once or rewritable optical disc is provided with a label attached to a music CD or the like on which information is printed in advance, and the user can write desired items on this label. is there. For this reason, printers that can print desired items on labels attached to write-once optical discs have been commercialized.
For example, Patent Document 1 discloses a technique in which a printing mechanism is incorporated in an optical disc apparatus that records and reproduces information with respect to the optical disc.
Patent Document 2 discloses a technique for recording an image on an optical disk using a laser beam, and Patent Document 3 uses a thermal head. An output device that outputs characters and images to a thermal recording medium using a thermal head is widely applied to the output of electronic computers, facsimiles, automatic ticket vending machines, registers, and the like. Such a thermal recording apparatus is reversible in color as disclosed in Patent Document 4 and has many materials that can be repeatedly developed and erased, and is used for electronic commuter passes, point cards, prepaid cards, and the like. .
Japanese Patent Laid-Open No. 05-236005 Japanese Patent Laid-Open No. 11-134648 JP 2000-1118016 A JP 05-270144 A

However, when a visible image is recorded by rotating the disk, the image is usually recorded in polar coordinates. However, if image data of orthogonal coordinates is recorded as it is, characters are distorted with different widths at the top and bottom, and the appearance is poor. . For this reason, there is known a method of recording data obtained by converting Cartesian coordinate data into polar coordinates. In this case, if the recording start point and end point are not exactly matched, gaps or overlaps occur in the image, resulting in a significant increase in image quality. There was a problem of lowering.
In particular, it is good if the image can be arranged so as not to cross the start point and the end point, but it becomes a problem if there is no place where a seam can be placed like a photograph.
Accordingly, the present invention has been made in view of the above-described points, and an object thereof is to provide a recording / reproducing apparatus and an image recording method capable of improving the image quality of a visible image recorded on a disc. .

In order to achieve the above object, the invention described in claim 1 is an optical pickup for recording or reproducing information on an information recording surface of an information recording medium, and records or reproduces information on the information recording surface of the information recording medium. A first rotational driving means for rotationally driving the information storage medium, and a visible image recording head provided on the image recording surface side opposite to the information recording surface and recording a visible image on the image recording surface; A second rotation driving means for rotating the information recording medium when a visible image is recorded on the image recording surface of the information recording medium, and information from the information recording surface. And control means for controlling the rotation speed of the second rotation driving means based on the reproduced signal.
According to the second aspect of the present invention, there is provided an optical pickup that records or reproduces information on an information recording surface of an information recording medium, and the information storage medium when information is recorded or reproduced on the information recording surface of the information recording medium. And a visible image recording head that is provided on the image recording surface side opposite to the information recording surface and records a visible image on the image recording surface. And a second rotation driving means for rotating the information recording medium when recording a visible image on the image recording surface of the information recording medium, and reproducing information from the information recording surface, and based on the reproduced signal. Control means for controlling the output timing of the image data recorded on the image recording surface.
According to a third aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, a signal used for reproducing information from the information recording surface and recording a visible image on the image recording surface is a bit. It is a clock signal.
According to a fourth aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, a signal used when reproducing information from the information recording surface and recording a visible image on the image recording surface is reproduced. It is a modulation signal.

According to a fifth aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, a signal used when reproducing information from the information recording surface and recording a visible image on the image recording surface is a wobble. It is a synchronous clock signal.
According to a sixth aspect of the invention, there is provided a recording / reproducing apparatus according to the first or second aspect, further comprising a PLL circuit that multiplies a binary signal read out by the optical pickup and reproduces information from the information recording surface. The signal used when recording a visible image on the image recording surface is a multiplied bit clock signal.
According to a seventh aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, a signal used for reproducing information from the information recording surface and recording a visible image on the image recording surface is specified. It is a dedicated signal for the area.
The invention according to claim 8 is the recording / reproducing apparatus according to claim 1 or 2, further comprising access means for accessing the optical pickup to a predetermined position, and before the start of recording of the visible image, the information recording medium. The optical pickup is moved to a predetermined position according to address information.
The invention according to claim 9 is the recording / reproducing apparatus according to claim 1 or 2, further comprising clock measuring means for measuring a circulating clock of the information recording medium, wherein the control means starts recording the visible image. The rotational speed control of the second rotation driving unit is performed based on a clock measurement result of one rotation of the information recording medium previously measured by the clock measuring unit.
The invention according to claim 10 is an image recording method for recording a visible image on an image recording surface opposite to an information recording surface for recording or reproducing information on an information recording medium, wherein the image recording surface is recorded on the image recording surface. When a visible image is recorded, information is reproduced from the information recording surface, and the rotation speed of the information recording medium is controlled based on the reproduced signal.
The invention according to claim 11 is an image recording method for recording a visible image on an image recording surface opposite to an information recording surface for recording or reproducing information on an information recording medium, the image recording surface being When a visible image is recorded, information is reproduced from the information recording surface, and the output timing of the image data is controlled based on the reproduced signal.

According to the first and tenth aspects of the present invention, an information recording medium is recorded when a visible image is recorded on the image recording surface based on a signal reproduced by reproducing information from the information recording surface of the information recording medium. Since the rotational speed of the second rotational driving means that rotates is controlled, the information recording medium can be rotated at a constant speed, and a high-quality visible image can be formed on the information recording medium. .
According to the second and eleventh aspects of the present invention, the fluctuation in the rotation of the disk is achieved by controlling the output timing of the image data based on the reproduced signal from the information recording surface of the information recording medium. Therefore, it is possible to output high-quality visible images on the information recording medium.
According to the third aspect of the present invention, if the signal used when reproducing from the information recording surface and recording the visible image on the image recording surface is a bit clock signal, the speed signal has high resolution and high accuracy control. Will be able to do.
According to the fourth aspect of the present invention, if a reproduction modulation signal is used as a reproduction modulation signal as a reproduction signal from the information recording surface and a visible image is recorded on the image recording surface, the circuit is simplified. Can be achieved.
According to the fifth aspect of the present invention, if the signal used for reproducing from the information recording surface and recording the visible image on the image recording surface is a wobble synchronization clock signal, the information recording medium can be controlled even with a blank disk. It becomes possible to do.
According to the sixth aspect of the present invention, the configuration of the PLL circuit can be simplified if the bit clock signal is obtained by multiplying the signal used when reproducing the information recording surface and recording the visible image on the image recording surface. be able to.
According to the seventh aspect of the present invention, if the signal used for reproducing from the information recording surface and recording the visible image on the image recording surface is a dedicated signal for the specific area, the circuit of the circuit is maintained while maintaining the control accuracy. Simplification can be achieved.
According to the eighth aspect of the present invention, a signal at a desired position can be acquired by moving the optical pickup to a predetermined position in accordance with the address information of the information recording medium before starting the recording of the visible image.
According to the ninth aspect of the present invention, the rotation speed control of the second rotation drive unit is performed based on the clock measurement result of one rotation of the information recording medium measured by the clock measurement unit before the start of visible image recording. As a result, the accuracy of one rotation can be increased.

Hereinafter, embodiments of the recording / reproducing apparatus according to the present invention will be described. Before that, the structure of an information recording medium capable of label printing by the optical disk apparatus of the present embodiment will be described with reference to FIGS. deep.
FIG. 10 is an exploded perspective view of an information recording medium that can perform label printing by the recording / reproducing apparatus of the present embodiment, and FIG. 11 is a plan view of the information recording medium.
A film-like label 52 is attached to one surface of the optical disc (information recording medium) 101 shown in FIGS. The label 52 is a so-called TC film made of a thermoreversible recording medium. The TC film is composed of a thermoreversible material whose transparency and color tone are reversibly changed by applied heat and the transparency or color tone is maintained in two or more forms at room temperature.
FIG. 12 is a diagram showing the relationship between the temperature change of the TC film used for the label and the transparency.
As shown in FIG. 12, the TC film becomes transparent when heated to a temperature between the temperature T2 and the temperature T3, and thereafter, the transparent state is maintained even when the temperature returns to room temperature below the temperature T0. Moreover, when it heats more than temperature T4, it will be in a translucent state, and when it returns to normal temperature below temperature T0, it becomes cloudy. Such a phenomenon occurs because the organic low molecular weight substance particles dispersed in the resin base material constituting the label 52 are closely adhered to the resin base material, and there are voids in the organic low molecular weight substance particle part. This is because in the absence of light, the light incident from one side is transmitted to the opposite side without being scattered, so that the label looks transparent. In contrast, when fine crystals of low-molecular-weight organic substance particles are aggregated to form a polycrystal, a gap occurs at the crystal interface or the interface between the particle and the resin base material, and light incident from one side is generated. This is because the label looks white because it is refracted, reflected and scattered at the interface between the void and the crystal or between the crystal and the resin. Of course, the label 52 is not limited to one that changes into two modes of a transparent state and a white turbid state, and the state is maintained, but various thermoreversible in which the color tone changes to two or more modes and the state is maintained. It is possible to selectively use a recording medium. An irreversible recording medium having no thermoreversible characteristics can also be used.

Hereinafter, an optical disk apparatus will be described as an example of a recording / reproducing apparatus according to the present invention.
FIG. 1 is a schematic diagram of an optical disc apparatus according to the present embodiment.
The optical disk apparatus shown in FIG. 1 includes a turntable 2 for mounting an optical disk 51 and a spindle motor (first rotation driving means, rotation driving means) 3 for rotationally driving the optical disk 51 mounted on the turntable 2. Is provided. An optical pickup 4 is provided for irradiating the optical disc 51 mounted on the turntable 2 with laser light to record information on the optical disc 51 or to reproduce information recorded on the optical disc 51. . The optical pickup 4 is supported by a moving mechanism that supports the optical pickup 51 so as to be movable in the radial direction of the optical disk 51. Although not shown, the optical pickup 4 includes a laser diode, an irradiation optical system for spot-irradiating the recording surface of the optical disc 51 with the laser light emitted from the laser diode, and the optical disc 51. And a return optical system for guiding the reflected light to the light receiving unit for obtaining a reference signal, tracking signal, focusing signal and the like from the reflected light.
The optical disk apparatus according to the present embodiment further includes a thermal head (visible image recording head) 5 that prints and erases the label 52 on the opposite surface side of the optical pickup 4 via the optical disk 51. Printing and erasing of the label 52 by the thermal head 5 is performed by rotating the optical disc 51 by bringing the thermal head 5 into contact with the label 52. At this time, the optical disk 51 needs to be rotated at a rotational speed (for example, 3.8 rpm) much slower than the rotational speed (for example, 200 to 500 rpm) when information is recorded on the optical disk 51 from the optical pickup 4. Is driven to rotate not by the spindle motor 3 but by a printing motor (second rotational driving means) 6. The printing motor 6 rotates the rubber roller 8 through the speed reduction mechanism 7. The rubber roller 8 is pressed against the end face of the optical disc 51 to rotate the optical disc 51.

FIG. 2 is a block diagram showing a configuration of the optical disc apparatus according to the present embodiment. The same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, the arrows in the figure indicate the flow of typical signals and data, and do not represent all the connection relationships of the blocks.
In FIG. 2, the optical disk 51 mounted on the turntable 2 is rotationally driven by the spindle motor 3. The spindle motor 3 is controlled such that the linear velocity is constant or the angular velocity is constant by a spindle controller 11 constituted by, for example, a motor driver or servo means. This linear velocity or angular velocity can be changed in stages.
The optical pickup 4 includes a semiconductor laser (not shown), an optical system, a focus actuator, a track actuator, a light receiving element, and a position sensor. The optical pickup 4 irradiates the optical disc 51 with laser light to record data on the optical disc 51, This is a unit for reading data from 51. The optical pickup 4 is provided with a seek motor (not shown) and is configured to be movable by the seek motor.
The focus actuator, track actuator, and seek motor of the optical pickup 4 are controlled so that the laser spot is positioned at the target location by a motor driver and servo processing based on signals obtained from the light receiving element and the position sensor. .
The track / focus control unit 12 controls the focus actuator and the track actuator of the optical pickup 4.
In such an optical disc apparatus, during a read operation, the reproduction signal obtained by the optical pickup 4 is amplified and binarized by the read amplifier 13, and then input to the DVD decoder 14, where the DVD decoder 14 performs deinterleaving and error. Correction processing is performed. This data is temporarily stored in a buffer memory (buffer RAM) 16 by the memory manager 15 and sent to a host computer (not shown) through a host interface (host I / F) 17 when it is prepared as sector data.

On the other hand, during the recording operation, data sent from the host computer through the host I / F 17 is temporarily stored in the buffer memory 16 by the memory manager 15. Recording is started when a certain amount of data is accumulated in the buffer memory 16, but before that, the laser spot must be positioned at the writing start point. This point is obtained by a wobble signal preliminarily engraved on the optical disc 51 by meandering tracks. In the wobble signal, information called ADIP is modulated, and there is also absolute address information. These pieces of information can be read from the ADIP decoder 18. The synchronization signal generated by the ADIP decoder 18 is input to the DVD encoder 19 so that data can be written at an accurate position.
The data in the buffer memory 16 is added with an error correction code and interleaved by the DVD encoder 19 and then subjected to EFM modulation and output. This signal is supplied to the LD controller 20. The LD control unit 20 constantly controls the light emission state so that the laser beam can be emitted with the recording (write) power according to the recording EFM, or appropriate recording and reproduction can be performed. As a result, information is recorded on the optical disc 51.
Further, in the present embodiment, the signal amplified and binarized by the optical read amplifier 13 is multiplied by the PLL circuit 22. The signal multiplied by the PLL circuit 22 is supplied as a bit clock to the F / V conversion circuit 24 via the change-over switch 23, and is subjected to F / V conversion from the F / V circuit 24, whereby a voltage corresponding to the rotation speed of the optical disc 51 is obtained. Like to get. Such a voltage corresponding to the rotational speed of the optical disc is used when a visible image is recorded on the optical disc, as will be described later.
In the present embodiment, the signal amplified and binarized by the optical read amplifier 13 is supplied to the F / V conversion circuit 24 via the changeover switch 23 without passing through the PLL circuit 22, and the F / V It is also possible to obtain a voltage corresponding to the rotational speed of the optical disc 51 by performing F / V conversion from the V circuit 24. Further, the wobble signal (reproduction modulation signal) detected by the optical pickup 4 is multiplied by the PLL circuit 22 and supplied to the F / V conversion circuit 24 via the changeover switch 23, and F / V conversion is performed by the F / V circuit 24. Thus, a voltage corresponding to the rotation speed of the optical disc 51 can be obtained.

Next, an operation when a visible image is recorded on a label attached to the optical disc will be described.
As described above, image data sent from a host computer (not shown) is temporarily stored in the buffer memory 16 through the host I / F 17 and the memory manager 15. This image data is polar coordinate system data, and is bitmap data that can be driven as it is according to the data at a predetermined angle. However, it is also possible to receive character data and generate a data pattern by a driver IC provided in the thermal head 5, or receive orthogonal coordinate data and convert it to polar coordinate data by the driver IC.
Then, the optical disk apparatus according to the present embodiment starts recording when image data from the host computer has been received or when a certain amount of image data has been received. It will continue to receive image data.
The system controller (control means) 21 activates the printing motor 6 via the motor driver 25 and supplies image data to the thermal head 5 at a predetermined timing.

FIG. 3 shows a configuration example of the driver IC provided in the thermal head. The timing chart is shown in FIG.
As shown in FIG. 3, the thermal head 5 is provided with a plurality of pixel recording heating elements 31-0, 31-1,. Data for determining whether or not these pixel recording heating elements 31-0, 31-1,... 31-n generate heat is sent serially via a DATA signal line. The DATA bit is input to the shift register 32 and is sequentially shifted by the CLOCK signal. When one line of data is transferred, the data in the shift register 32 is latched in the register 33 by the LATCH signal. At this point, the next line of data can be transferred to the shift register 32. Then, the latched data is output to the register 33 in response to the STROBE signal, and the transistors Tr0, Tr1,... Trn are turned on / off by the data D0, D1,. When the transistors Tr0, Tr1,... Trn are turned on, current flows through the pixel recording heating elements 31-0, 31-1,. In this case, the temperature control is performed by PWM control.
The image is recorded by pressing the thermal head 5 against a heat sensitive film (TC film) 52 of the optical disc 51 and rotating the optical disc 51. At this time, if the rotation of the optical disc 51 and the data transmission are synchronized and recording is not performed exactly once, a gap is generated between the recording start point Ps and the end point Pe as shown in FIG. However, duplication may occur and the quality of the visible image may be degraded.
Therefore, in the optical disk apparatus according to the present embodiment, when a visible image is recorded on the optical disk, the optical disk is accurately rotated at a constant speed.
However, since the rotational speed of the disk when recording a visible image on the label 52 affixed to the optical disk 51 is a very slow rotational speed of about 3.8 rpm, information recording / reproduction of the optical disk 51 is performed when recording a visible image. Therefore, it is difficult to rotate the optical disk 51 using the spindle motor 3 for use.
Therefore, in the optical disk apparatus according to the present embodiment, the printing motor 6 is provided separately from the spindle motor 3, and the reproduction read from the information recording surface of the optical disk 51 by the optical pickup 4 to control the rotation of the printing motor 6. By using the signal, the influence of play and slippage of the drive system is suppressed, and the optical disk is rotated accurately at a constant speed when recording a visible image.

FIG. 5 is a control block diagram of a printing motor for realizing the rotation control described above.
Here, an explanation will be given by taking an optical disk such as a DVD + R with a heat sensitive label as an example.
In this case, since user data can be recorded on the information recording surface of the optical disc by the laser beam from the optical pickup 4, in the optical disc apparatus of the present embodiment, the user data recorded on the information recording surface of the optical disc 51 is optically picked up. 4 is detected. The detected RF signal is binarized by the read amplifier 13, and then the bit clock generated by multiplying by the PLL circuit 22 is F / V converted by the F / V conversion circuit 24, and a voltage corresponding to the rotation speed of the optical disk 51 is obtained. To get.
In this case, if a PLL circuit that reads and uses user information from the optical disk is used as the PLL circuit 24, the circuit can be simplified. For this purpose, basically, the oscillation range of the VCO may be widened, but it is difficult to construct a VCO having oscillation ranges with different digits. Therefore, by dividing the output frequency of the VCO and locking it to the input signal, a bit clock multiplied signal can be generated relatively easily, and when this is used as a disk speed signal, the circuit can be simplified. can do.
In the optical disk apparatus according to the present embodiment, the signal binarized by the read amplifier 13 is F / V converted by the F / V conversion circuit 24 without being multiplied by the PLL circuit 22 to obtain the rotation speed of the optical disk 51. A corresponding voltage can also be obtained. In this case, the frequency changes because the RF signal is a reproduction modulation signal that is EFM-modulated. However, if the F / V conversion band is appropriately set, the RF signal can be realized without any problem.
However, in this case, user data must be recorded on the optical disc, and it is not possible to deal with a blank disc.
Therefore, the optical disk apparatus according to the present embodiment uses the read switch 13 to binarize the wobble signal as shown in FIG. It is also possible to input to the F / V conversion circuit 24 and perform F / V conversion by the F / V conversion circuit 24 to obtain a voltage corresponding to the rotational speed of the optical disc 51.
The speed voltage corresponding to the rotational speed of the optical disk 51 obtained by the F / V conversion circuit 24 is supplied to the comparator 27 of the motor driver 25, and the target speed data output from the system controller (CPU) 21 in the comparator 27. Is compared with the target speed voltage D / A converted by the D / A converter 26. The differential voltage is supplied to the printing motor 6 through the feedback control filter 28 and the amplifier 29. Thus, the printing motor 6 is driven. The user data described in the present embodiment includes not only user area information but also information other than the user area.

As described above, in the optical disk apparatus according to the present embodiment, it is very cheap and inexpensive if a signal (including user data) recorded on the information recording surface of the optical disk 51 is used in place of the rotary encoder. High resolution speed control becomes possible.
As a result, the high-resolution rotary encoder required for controlling the rotation speed of the rotary motor and the rotation angle of the recording medium by detecting the rotation angle by a rotary encoder connected to the rotary table on which the disk is placed as in the prior art. In addition to being unnecessary, it is not necessary to provide a speed increasing mechanism or the like in order to increase the resolution, so that a small optical disk can be realized at low cost.
In addition, there is an advantage that the angle error, speed error, etc. of the disk due to the slip that occurs when the disk is rotated by open loop control using a step motor or the like can be ignored.
In the optical disk apparatus according to the present embodiment, the print motor 6 is controlled by the clock signal obtained from the optical disk 51, whereby high-quality control such as matching the start point and the end point of the visible image recorded on the optical disk 51 is also possible. It becomes possible.
Furthermore, in the optical disc apparatus of the present embodiment, the reproduction modulation signal read from the optical disc 51 is used as it is as a control signal. Such a reproduction modulation signal (EFM modulation signal) has a wide signal cycle, but since the reproduction modulation signal has a higher frequency than the motor control band and the data output band, if the period is treated as an average value, It is not necessary to provide a PLL circuit, and the image quality of the visible image can be improved without increasing the cost.
Furthermore, the optical disk apparatus according to the present embodiment records user data on the optical disk when the wobble clock signal used for the rotation control at the time of information recording or the generation of the write clock is used as the control signal at the time of image recording. A so-called blank disc can be used.
Furthermore, in the optical disk device of the present embodiment, since the frequency range of the VCO can be suppressed by multiplying the clock signal, conventionally, a clock signal of a low frequency signal reproduced at the number of rotations at the time of image recording is generated. Therefore, it is not necessary to make the frequency range of the PLL VCO very large, and the circuit can be simplified.

Next, an optical disc device according to a second embodiment of the present invention will be described.
The optical disk device according to the second embodiment is characterized in that a high-quality visible image is printed by controlling the pixel printing timing, that is, the output timing of image data in accordance with the rotational fluctuation.
FIG. 6 is a control block diagram of image data output timing.
In this case, the signal input to the F / V conversion circuit 24 in FIG. 5 is input to the counter 41 provided in the system controller 21 so that the counter 41 is counted up as the optical disk 51 rotates. I have to. Although it is desirable that the counter 41 can count a signal for one rotation of the disk, the overflow may be counted by the CPU 44. The CPU 44 drives the printing motor 6 via the motor driver 25 (see FIG. 2), and starts recording from a predetermined position or an appropriate position when the thermal head 5 is lowered onto the optical disk 51. When rewriting the entire surface of the optical disc 51 instead of adding a visible image, an appropriate position may be used. The counter 41 is reset simultaneously with the start of image recording, and the first image data is transmitted. The counter value for sending the next image data is set to the target value, and the counter 41 waits for the target value to be reached. The counter value for one round is X, the number of pixels for one round in the circumferential direction is Y, and the target value 43 for outputting the nth image data is X ÷ Y × n. The comparator (CMP) 42 compares the counter 41 with the target value 43, and notifies the CPU 44 if they match, each time the CPU 44 repeats sending image data and setting the next target value 43. When all the image data is sent and finally the clear data is sent to the thermal head 5, the thermal head 5 may be lifted to stop the rotation of the disk.
With this configuration, conventionally, when an image is recorded using the thermal head 5, the rotational speed of the disk must be 1/100 or less as compared with the case where information is recorded. For this reason, in order to stably control the low-speed rotation by direct driving of the motor, a low-speed rotation motor is required, and the information recording spindle motor cannot be used as it is. Even when driven by a motor having a speed reduction mechanism, it is difficult to obtain a stable low speed rotation with an inexpensive speed reduction mechanism with a lot of play.

On the other hand, in the optical disk apparatus of the second embodiment, the rotation of the optical disk 51 is not accurately and stably maintained, but the output timing of image data, that is, the heat generation timing of the thermal head 5 is matched with the rotation of the optical disk 51. By doing so, a high-quality visible image can be printed.
FIG. 7 is a flowchart showing a process for obtaining a dedicated signal necessary for image recording. The processing shown in FIG. 7 is a diagram showing processing when a fixed-cycle signal is written from an optical disk to a predetermined location without using a PLL circuit, and the reproduced signal is used for control during image recording. The processing shown in FIG. 7 is executed by the system controller 21.
In this case, if it is determined that image recording is started (“Yes” in S1), the disk is rotated at a writable speed (S2), and the servo of the optical pickup is turned on (S3). Then, the OPC area is accessed (S4), a signal with a fixed period of 10T is written instead of OPC, jumpback is performed (S5), and the disk is rotated at the image recording speed at a reduced rotational speed (S6). Then, when the previously written signal is detected, the process proceeds to the image recording process (S8). By performing processing in this way, the circuit can be simplified while maintaining high control accuracy with a dedicated signal.

FIG. 8 is a flowchart showing processing for obtaining an RF signal and a wobble signal necessary for image recording. The process shown in FIG. 8 is also executed by the system controller 21.
In the process shown in FIG. 8, if the rotational speed of the disk is reduced to the rotational speed at the time of image recording, the decoder does not operate and the address cannot be read. If it is determined that image recording starts (“Yes” in S11), the address can be read. The disk is rotated at the speed (S12), and the servo of the optical pickup is turned on (S13). Then, after accessing an address of a desired radius position or a position where an RF signal is present (S14), the disk is rotated at the image recording speed by reducing the rotation speed of the disk (S15). Thereafter, the process may be shifted to an actual image recording process (S16). By performing processing in this way, a signal can be acquired at a desired position.
FIG. 9 is a flowchart showing a process for measuring the count value for one rotation of the disk. The process shown in FIG. 9 is also executed by the system controller 21.
The process shown in FIG. 9 generally cannot determine an accurate radius from an address. In addition, the recording linear density may differ depending on the media, and it is difficult to position and reproduce the signal at a portion where the count value for one round is clear. In this case as well, if it is first determined that image recording will start ("Yes" in S21) When the disk is rotated (S22) and the optical pickup servo is turned on (S23), the counter is reset (S24). The disk waits for one rotation (S25), and the counter value is read (S26). Thereafter, the process proceeds to image recording processing (S27). The FG signal of the spindle motor is used to detect that the disk has made one revolution. In this way, the accuracy of one rotation can be increased.

1 is a schematic diagram of an optical disc apparatus as an embodiment. 1 is a block diagram showing a configuration of an optical disc device according to an embodiment. The figure which showed the structural example of the driver IC provided in the thermal head. The timing chart of driver IC. The control block diagram of the motor for printing. The control block diagram of the output timing of image data. The flowchart which showed the process for obtaining the dedicated signal required at the time of image recording. The flowchart which showed the process for obtaining RF signal and a wobble signal required at the time of image recording. The flowchart which showed the process for measuring the count value for 1 round of a disk. 1 is an exploded perspective view of an information recording medium on which label printing can be performed by the recording / reproducing apparatus of the present embodiment. FIG. 11 is a plan view of the information recording medium shown in FIG. 10. The figure which showed the relationship between temperature change and transparency as a characteristic of TC film used for a label.

Explanation of symbols

  2 Turntable, 3 Spindle motor, 4 Optical pickup, 5 Thermal head, 6 Printing motor, 7 Reduction mechanism, 8 Rubber roller, 11 Spindle control unit, 12 Track / focus control unit, 13 Read amplifier, 14 DVD decoder, 15 Memory Manager, 16 buffer memory, 17 host interface (host I / F), 18 ADIP decoder, 19 DVD encoder, 20 LD control unit, 21 system controller, 22 PLL circuit, 23 changeover switch, 24 F / V conversion circuit, 25 motor Driver, 31-0, 31-1,... 31-n Pixel recording heating element, 32 shift register, 33 register, 41 counter, 42 comparator, 43 target value, 44 CPU, 51 optical disc, 52 label

Claims (11)

  An optical pickup that records or reproduces information on an information recording surface of an information recording medium, and a first rotation driving unit that rotationally drives the information storage medium when information is recorded or reproduced on the information recording surface of the information recording medium And a visible image recording head that is provided on the image recording surface side opposite to the information recording surface and records a visible image on the image recording surface. A second rotational driving means for rotationally driving the information recording medium when a visible image is recorded on the image recording surface, and information is reproduced from the information recording surface, and the second rotational driving is performed based on the reproduced signal. And a control means for controlling the rotational speed of the means.   An optical pickup that records or reproduces information on an information recording surface of the information recording medium, a rotation driving means that rotationally drives the information storage medium when recording or reproducing information on the information recording surface of the information recording medium, An image recording surface of the information recording medium, comprising: a visible image recording head provided on an image recording surface side opposite to the information recording surface, and a visible image recording head for recording a visible image on the image recording surface. And a second rotational driving means for rotationally driving the information recording medium when recording a visible image, and image data for reproducing information from the information recording surface and recording on the image recording surface based on the reproduced signal And a control means for controlling the output timing of the recording / reproducing apparatus.   The recording / reproducing apparatus according to claim 1 or 2, wherein a signal used when reproducing information from the information recording surface and recording a visible image on the image recording surface is a bit clock signal. Playback device.   3. The recording / reproducing apparatus according to claim 1, wherein a signal used when reproducing information from the information recording surface and recording a visible image on the image recording surface is a reproduction modulation signal. Playback device.   3. The recording / reproducing apparatus according to claim 1, wherein a signal used when reproducing information from the information recording surface and recording a visible image on the image recording surface is a wobble synchronous clock signal. Recording / playback device.   3. The recording / reproducing apparatus according to claim 1, further comprising a PLL circuit that multiplies a signal that is read out by the optical pickup and binarized, and reproduces information from the information recording surface to display a visible image on the image recording surface. A recording / reproducing apparatus, wherein a signal used for recording is a multiplied bit clock signal.   3. The recording / reproducing apparatus according to claim 1, wherein a signal used when reproducing information from the information recording surface and recording a visible image on the image recording surface is a dedicated signal for a specific area. Recording / playback device.   3. The recording / reproducing apparatus according to claim 1, further comprising access means for accessing the optical pickup to a predetermined position, wherein the optical pickup is set to a predetermined position according to address information of the information recording medium before the start of recording of the visible image. A recording / reproducing apparatus that is moved.   3. The recording / reproducing apparatus according to claim 1, further comprising a clock measuring unit that measures a circular clock of the information recording medium, wherein the control unit measures the clock measured by the clock measuring unit before starting the recording of the visible image. A recording / reproducing apparatus for controlling the rotation speed of the second rotation driving means based on a measurement result of one rotation of the information recording medium.   An image recording method for recording a visible image on an image recording surface opposite to an information recording surface for recording or reproducing information on an information recording medium, wherein the information is recorded when the visible image is recorded on the image recording surface. An image recording method comprising reproducing information from a recording surface and controlling a rotation speed of the information recording medium based on the reproduced signal.   An image recording method for recording a visible image on an image recording surface opposite to an information recording surface for recording or reproducing information on an information recording medium, wherein the information is recorded when the visible image is recorded on the image recording surface. An image recording method comprising reproducing information from a recording surface and controlling output timing of image data based on the reproduced signal.

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