JP3590605B2 - Optical disk drive - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk device capable of writing data to an optical disk.
[0002]
[Prior art]
In an optical disk device capable of writing data to an optical disk, with the recent increase in the speed of writing data to an optical disk, while writing data to the optical disk, the speed of writing data to the optical disk is reduced from the host computer or the like. In many cases, the transfer speed of the transferred write data is reduced. Such a state in which there is no data to be written is called a so-called buffer underrun.
Conventionally, when a buffer underrun occurs, writing is interrupted at that point, and this optical disk is no longer usable.
[0003]
Therefore, recent optical disk devices are often provided with a recording protection function called a so-called burn proof or just link so that the optical disk is not wasted due to the occurrence of a buffer underrun.
According to the recording protection function, when a buffer underrun occurs, the writing is interrupted and the process stands by for a while. If the data transfer speed increases after the interruption, the interruption is canceled and the writing is performed again.
By providing such a recording protection function, it was possible to prevent the optical disk from being wasted even if a buffer underrun occurred.
[0004]
[Problems to be solved by the invention]
When a recording protection function such as burn proof is activated, the optical disk is not wasted even if a buffer underrun occurs. However, if the recording protection function is operated too many times, even though the writing speed to the optical disk is being increased, the writing, interruption, and resuming are repeatedly performed. There is a problem that the entire processing time becomes longer.
[0005]
If the number of interruptions in writing data is too large, it is evident from the display of an indicator or the like provided on the front surface of the optical disk device that the number of interruptions in writing is large. There is also a problem that the user has anxiety about the quality of the product.
[0006]
Therefore, the present invention has been made to solve the above-described problem, and an object of the present invention is to reduce the number of times of operation of the recording protection function that eliminates write failure during buffer underrun, that is, when the number of interruptions during data writing is too large, An object of the present invention is to provide an optical disk device that can reduce the number of times.
[0007]
[Means for Solving the Problems]
That is, according to the optical disk apparatus of the present invention, data can be written to the optical disk, and when a buffer underrun occurs, the data writing is interrupted. an optical disk apparatus comprising a control unit having a recording protection for controlling to restart the data writing when sufficient data has been accumulated in the data written to the buffer memory for temporarily storing the data prior to recording protection Storage means for previously storing a threshold value of the number of times of operation of the recording protection function is provided, the control means counts the number of times of operation of the recording protection function, And that the counted number of times of operation of the recording protection function exceeds the threshold value read from the storage means. When disconnection is characterized in that automatically controlled to slow the writing speed to the optical disk.
By adopting this configuration, the writing speed is automatically reduced when the number of operations of the recording protection function is increased, so that the number of occurrences of buffer underrun is reduced, and the operation at the time of buffer underrun is reduced. The number of times the recording protection function is activated can also be reduced.
As a result, it is possible to prevent the data writing time from being prolonged due to the interruption of the data writing many times, and to eliminate the user's anxiety about the recording quality of the optical disk on which the data is written.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, FIG. 1 shows a block diagram of the internal structure of the optical disk device, and based on this, the configuration of the present embodiment will be described together with the operations thereof.
The optical disc device 30 includes an optical pickup 19 having a laser diode (not shown) that oscillates a laser beam for irradiating the optical disc 10 and a photodetector (not shown) that receives light reflected from the optical disc 10.
[0009]
The optical pickup 19 is movably provided by a feed mechanism 20 that moves the optical pickup 19 in the tracking direction of the optical disc 10. The feed mechanism 20 includes a thread shaft (not shown) on which the optical pickup 19 is slidably supported, a feed motor (not shown), and the like.
The optical disk 10 is mounted on a turntable provided on a rotation shaft of a spindle motor 22, and is rotated by driving the spindle motor 22.
[0010]
The servo processor 24 controls the rotation of the optical disk 10 by the spindle motor 22, the tracking of the objective lens (not shown) in the optical pickup 19, the focusing of the objective lens in the optical pickup 19, and the control of the feed mechanism 20 of the optical pickup 19.
[0011]
The servo processor 24 controls the CPU 28 based on the error signal extracted by the RF amplifier 26 from the intensity signal of the reflected light reflected from the optical disk 10 and the signal from the decoder 29 that decodes the data extracted by the RF amplifier 26. The control of each servo system is performed based on the control signal e.
That is, the servo processor 24 performs each servo control such as tracking and focusing of the objective lens by the control signals a and b based on the error signal from the RF amplifier 26.
Further, the servo processor 24 controls the feed mechanism 20 based on the address signal from the CPU 28 by the control signal c so that the optical pickup 19 moves to the specified address.
Further, the rotation of the spindle motor 22 is controlled by a control signal d from the servo processor 24 based on an error signal from the RF amplifier 26 and a control signal e from the CPU 28.
However, each of these servo controls may be performed by a servo processor with one IC, or a separate IC may be employed for each control.
[0012]
On the other hand, the optical disk device 30 is connected to a host computer 40 via a cable 41 via an input / output unit 34 including an interface such as SCSI or ATAPI.
The operation of the optical disk device 30 is started by inputting each command from the host computer 40. Normally, data to be written on the optical disk 10 is transferred from the host computer 40.
[0013]
Data transferred from the host computer 40 is temporarily stored in the buffer memory 42 via the input / output unit 34. As an example of the buffer memory 42, a DRAM having a capacity of about 4 MB is used.
The encoder 44 reads and encodes the data in the buffer memory 42. The laser driver 32 changes the light intensity of the laser diode of the optical pickup 19 based on the encoded data, and performs the data writing on the optical disk 20.
[0014]
The data read from the optical disk 10 is decoded by the decoder 29 and then output to the input / output unit 34 via a buffer memory (not shown).
[0015]
The CPU 28 of the present embodiment is a control unit described in the claims. The CPU 28 operates based on a control program stored in advance in a ROM or the like (not shown).
The CPU 28 has a recording protection function 36 (burn proof, just link, etc.) for interrupting data writing so that the optical disk is not wasted when a buffer underrun occurs.
The recording protection function 36 checks the remaining data in the buffer memory 42, and controls the encoder 44, the laser driver 32, and the servo processor 24 so as to interrupt the writing when the data in the buffer memory 42 becomes smaller than a predetermined capacity.
[0016]
When the recording protection function 36 operates in this way, the counter 38 in the CPU 28 counts the number of times the recording protection function 36 operates.
When the recording protection function 36 in the CPU 28 detects that the data stored in the buffer memory 42 has been stored to a predetermined capacity or more or to the maximum of the memory capacity, the recording protection function 36 controls the encoder to restart the data writing. 44, controlling the laser driver 32 and the servo processor 24;
[0017]
The CPU 28 is connected to a storage means 35 composed of a ROM or the like, and stores a preset operation limit of the recording protection function 36, that is, the number of interruption limits (hereinafter, sometimes referred to as a threshold α). Here, the limit number of interruptions refers to the number of times that in a single data write operation, if the recording protection function 36 is activated any more, the write time becomes long and the user becomes uneasy.
The threshold α may be changeable to any numerical value.
[0018]
The CPU 28 is provided with comparison means 39 for comparing the threshold value α read from the storage means 35 with the number of times the recording protection function 36 has been operated counted by the counter 38.
When the comparing means 39 determines that the number of times of operation of the recording protection function 36 exceeds the threshold value α read from the storage means 35, the CPU 28 controls the laser driver 32 and the servo processor 24 to reduce the writing speed.
Note that the writing speed in the present embodiment is a double writing speed such as 12 × speed or 20 × speed.
[0019]
When the writing speed decreases, the amount of data stored in the buffer memory 42 does not suddenly decrease, and the amount of data written to the optical disk 10 and the amount of data transferred from the host computer 40 are just in balance. Therefore, occurrence of a buffer underrun in which data to be written is lost can be suppressed.
Therefore, the number of times the recording protection function such as a burn proof that operates in the buffer underrun is also reduced.
[0020]
Next, the operation of the present invention will be described based on the flowchart of FIG.
First, when a write command is input from the host computer 40, a data write operation is started (start).
If a buffer underrun occurs during data writing, the data protection is temporarily stopped by the recording protection function. When the buffer underrun is resolved, the data writing is restarted.
[0021]
Then, in step S100, the CPU 28 starts counting the number of operations of the recording protection function in which writing is temporarily stopped. In the following step S102, the count of the number of times the recording protection function is activated is continued.
In the following step S104, the CPU 28 determines whether or not the counted number of times of operation of the recording protection function exceeds a predetermined threshold α. The threshold value α is set in advance and stored in the storage unit 35. The CPU 28 reads the threshold value α from the storage unit 35 and compares it with the counted number of times of operation of the recording protection function. As a result of the comparison, if the number of times of activation of the recording protection function does not exceed the threshold α, the process proceeds to step S106. On the other hand, when the number of times of the operation of the recording protection function exceeds the threshold α, the process proceeds to step S105.
[0022]
In step S105, the CPU 28 controls the servo processor 24 and the laser driver 32 to reduce the data writing speed.
For example, if writing is performed at 24 × speed and the number of operations of the recording protection function increases, the writing speed such as 16 × speed, which is lower than 24 × speed, is reset in step S104.
If the writing speed is reduced in step S105, the process returns to step S100 to count the number of times the recording protection function has been activated since the writing speed was reduced.
[0023]
On the other hand, in step S106, the CPU 28 determines whether data writing to the optical disk 10 has been completed. That is, if the data writing has not been completed, the process returns to step S102, and the counting of the number of operations is continued.
When the data writing is completed in step S106, the process ends.
[0024]
【Example】
A case where data is written to a CD-R at 24 × speed using a CD-R as an example of an optical disk will be described.
In such a case, if the maximum capacity of the buffer memory is 4 MB, the data in the buffer memory is used up in 0.97 sec. If the data transfer speed from the host computer is about 3 MB / sec, the data write is interrupted every 2 sec by the recording protection function, and the data write is resumed in about 1.3 sec. In this case, the number of interruptions of data writing is too large.
Thus, by reducing the writing speed to 16 times speed, the number of interruptions of data writing can be greatly reduced.
[0025]
Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the embodiments, and it is needless to say that many modifications can be made without departing from the spirit of the invention. .
[0026]
【The invention's effect】
According to the optical disc device of the present invention, the writing speed is automatically decreased when the number of operations of the recording protection function increases, so that the number of times of buffer underruns is reduced, The number of times the activated recording protection function is activated can also be reduced.
As a result, it is possible to prevent the data writing time from being prolonged due to the interruption of the data writing many times, to eliminate the user's concern about the recording quality of the optical disk on which the data is written, and to ensure the data writing. It has a significant effect that it can be performed.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an optical disc device according to the present invention.
FIG. 2 is a flowchart illustrating a self-diagnosis operation of the optical disc device.
[Explanation of symbols]
Reference Signs List 10 optical disk 19 optical pickup 20 moving means 22 spindle motor 24 servo processor 26 RF amplifier 28 CPU (control means)
29 decoder 30 optical disk device 32 laser driver 34 input / output unit 35 storage means 36 recording protection function 38 counter 39 comparing means 40 host computer 41 cable 42 buffer memory 44 encoder

Claims (1)

Data can be written to an optical disk, and when a buffer underrun occurs, the data writing is interrupted. After the data writing is interrupted, the data transfer speed increases or data is written to a buffer memory that temporarily stores data before data writing. An optical disc device having a control unit having a recording protection function of controlling to restart data writing when sufficient data has been accumulated,
Storage means for storing a threshold value of the number of times of operation of the recording protection function is provided in advance,
The control means,
Count the number of times the recording protection function is activated,
Compare the counted number of times of operation of the recording protection function with the threshold value read from the storage means,
An optical disk apparatus, characterized in that, when it is determined that the counted number of times of operation of the recording protection function exceeds a threshold value read from the storage means , control is performed so as to automatically reduce a writing speed to the optical disk.

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