JP3449346B2 - Disk recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absolute time information (ATIP).
= Absolute Time in Pregroo
ve) and a writable optical disk device for writing data to a writable optical disk having address information such as
In particular, it relates to a disk recording / reproducing device such as a portable type optical disk device. 2. Description of the Related Art As a writable optical disk, a write-once CD-WO (Write Once) can be written only once.
rewritable CD-MO (Magnetic and Opt) that performs writing by applying a magnetic field together with laser irradiation.
ical compact disk) is known. These writable optical discs are formed with a pre-groove for guiding an information writing head. To write and record information accurately, the pre-groove must be properly formed along the pre-groove. Tracking follow-up control must be performed. If the write head gets out of the pre-groove for some reason (this is called detracking), the recording of that part will be inaccurate. Some optical disks have absolute time information in order to improve the recording density. This absolute time information has, for example, 75 frames per second and is composed of 42-bit absolute time data. This absolute time data has an NR having a bit rate of 3150 bps (ie, 42 bits × 75 frames = 3150 bps).
Z (Non Return to Zero) code, which is bi-phase mark modulated with a 6.3 kHz bit clock, and further frequency-modulated the modulated bi-phase mark signal, the subcarrier frequency 22.
It becomes a wobble signal of the 05 kHz PM signal. Thus, at the time of producing the master disc of the optical disc, a wobbling pre-groove wobbled in a direction orthogonal to the spiral recording track on the optical disc based on the wobble signal is formed, thereby having absolute time information. In the case of an optical disk having absolute time information as described above, as a countermeasure against a writing error due to the detrack, the continuity of writing and recording is checked while always monitoring the absolute time information. A method for detecting a detrack for stopping the writing operation is disclosed in Japanese Patent Application No. 1-332958 filed on Dec. 25, 1999 by the present applicant. [0005] However, the writing of information data to the optical disk is not completed just by stopping the writing operation, and the writing process must be continued again later. Furthermore, the post-processing also differs depending on the cause of the detrack. That is, if there is a scratch on the optical disk, writing and recording cannot be performed on the scratched portion. However, if the writing head is displaced by an impact force, the writing head is returned to that position again to perform writing. If it is performed, writing and recording can be performed. [0006] In view of the above problems, an object of the present invention is to:
It is an object of the present invention to provide a disk recording / reproducing apparatus for improving the efficiency of writing information data on an optical disk and performing appropriate writing while correcting detrack as much as possible. A disk recording / reproducing apparatus according to the present invention comprises: (a) address reproducing means for reproducing the address information from a recordable disk in which address information is previously described; and (b) Address demodulating means for demodulating the address information reproduced by the address reproducing means,
(C) address continuity detecting means for detecting whether or not the address information demodulated by the address demodulating means continuously changes; and (d) based on the address information demodulated by the address demodulating means. Error counting means for counting the cumulative number of errors during the write operation,
(E) an impact detection sensor for detecting an impact applied to the disk recording / reproducing device; and (f) the address detection means detects that the address information does not change continuously, and the impact detection sensor detects an impact. When it is determined that a detrack has occurred due to an impact, the address detecting means detects that the address information does not continuously change, and when the impact detection sensor does not detect an impact, the detrack caused by a cause other than an impact is detected. (G) when the discriminating means determines that detrack has occurred due to an impact, the address is adjusted so that writing is performed again from the address position at which the impact occurred. The error counting means when it is determined that The cumulative number of errors has increased sharply
If not , change the rewriting address after detracking.
Advance by the first distance , and accumulate the error of the error counting means.
If the product number increases rapidly, the rewrite address after the detrack is changed to a second address larger than the first distance.
And a write address control means for advancing by a distance . The address of the writing location is read by the reading means while writing data to the optical disk, and whether or not the address maintains continuity is determined by the determining means. Depending on the output of the impact sensor that detects the impact force received by the head, that is, whether the discontinuity is due to an external impact force alone or to the presence of scratches or protrusions on the optical disk Then, the control of the head position correction is made different by the position correction means, and the writing operation is continued. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the accompanying drawings. The absolute time information is, for example, 7
The information is one-fifth of a second as one unit, and this unit is called one frame. TR in FIG. 3 indicates a track along the pre-groove of the optical disk, and m, m + 1,... Indicate absolute time information for each frame. A disk recording / reproducing apparatus capable of reading the absolute time information is configured, for example, as shown in FIG. The optical disc D is rotated at a constant linear velocity by the spindle motor 1. Reference numeral 2 denotes an optical head unit, which outputs a laser beam on / off modulated by a given information data signal, a semiconductor laser 2a, and a laser beam for obtaining reflected light for generating a servo signal. Output semiconductor laser 2b, collimating lens 2c, polarizing beam splitter 2d, quarter-wave plate 2e, dichroic mirror 2f for reflecting only a specific wavelength beam, objective lens 2
An actuator 2h composed of a coil for driving g and a magnet, and a quadrant light detector 2j to which a laser beam from a beam splitter 2d is supplied via a cylindrical lens 2i. The output signal of the quadrant light detector 2j is A,
Assuming B, C, and D, A + B + C + D
Is formed, and the subtractor 4 outputs (A + D)-
A focus error signal represented by (B + C) is supplied to the focus servo circuit 5, and a control signal for focus control is supplied to the actuator 2h. The output of the addition circuit 3 is a band-pass filter 6
Supplied to Bandpass filter 6 is 22.05 kHz
A signal component having a pass band of z ± 900 Hz and corresponding to a pregroove is output from a band-pass filter 6 to a synchronous detection circuit 7 and a waveform shaping circuit 11. The synchronous detection circuit 7 has a terminal 22.0 to 22.0
A 5 kHz sine wave signal is provided. A tracking error signal is extracted from the output of the synchronous detection circuit 7 by a low-pass filter 9, and the extracted tracking error signal is supplied to a tracking servo circuit 10. A control signal for driving tracking control is provided. A pulse train modulated by the optical disc format absolute time code is obtained by the waveform shaping circuit 11. This pulse train is demodulated into data bits of an absolute time code in a demodulation circuit 12, and the demodulated absolute time information is supplied to a microcomputer 1 for controlling the system.
4 will be supplied. On the other hand, the optical head device 2 has an impact sensor 22 for detecting an impact force received from the outside.
The output of this sensor is input to the microcomputer 14. Further, the demodulation circuit 12
Is provided with an error counter 20 for counting the number of errors during writing from the absolute time information demodulated in step (1). This count number is always input to the microcomputer (14). The microcomputer 14 uses the absolute time information transmitted from the demodulation circuit 12, the output from the shock sensor 22, and the accumulated error number from the error counter 20 to perform a process described in detail below to execute the optical head unit 2. Is corrected and controlled. Further, the microcomputer 1
Reference numeral 4 denotes an error occurrence address and the like, and
To record the recording state of the optical disc D. Hereinafter, the flow of processing by the microcomputer 14 will be described with reference to FIG. In step 30, an initial value of a timer time variable t, which is a time signal as a reference, is set. In step 31, one frame (1) as the minimum unit of the absolute time information of the optical disc D to be written is set by the timer function of the microcomputer.
/ 75 seconds), the timer time variable t is incremented by one in step 32 every frame, and the absolute time information T is read in step 33. Unless an error has occurred, the read absolute time information T should match the read timer time t, and this determination is made in step 34. If they match, proceed to step 39,
If it is determined that writing has not been completed, step 3 is performed again.
Go to 1 and repeat the above steps. If not, it is determined in step 35 whether or not the output of the impact sensor 22 is present. The presence of this output indicates that the optical head device 2 has been forcibly moved from the original position to the position of the absolute time information read in step 33 due to the impact force. A position correction command is given to the tracking servo circuit 10 shown in FIG. Then, in step 37, the read absolute time information T and the timer time variable t at the time of the previous reading are stored. This step 37
The significance of this process will be described later with reference to FIG. Then, in step 38, the timer time variable t is reset to the absolute time information value T read at the present time. In step 39, it is determined whether or not the writing operation has been completed. If not completed, the above steps are repeated. If completed, in step 40, the stored absolute time information T and timer time t
May be displayed on a display, for example, or may be recorded on the optical disk D itself and used during reproduction. If there is no output from the impact sensor in step 35 described above, it means that detrack has occurred even though the optical head unit 2 is not subjected to an impact force, and scratches or projections are formed on the optical disc. It shows that there is. In this case, the processing is divided into two types from the history of the cumulative number of errors output from the error counter 20 shown in FIG. That is, in the case of a flaw, since the accumulated number of errors generally increases rapidly, the rate of increase rapidly increases. Therefore, if the history of the cumulative number of errors shows a tendency, it is determined that there is a flaw in front of it, and the optical head device unit 2 increases the address with respect to the optical head D in step 43 to avoid the flaw. Proceed. On the other hand, in the normal case where the cumulative number of errors does not increase particularly large, it is not a case like a flaw. Therefore, in order to avoid only the vicinity of the address where the error (detrack) has occurred, step 42 is executed. In step (1), the address of the optical head device 2 is advanced with respect to the optical head D. After the processing in step 42 or 43, the process proceeds to step 37 as in step 36. Referring to FIG. 3, a description will be given of the state of writing and recording when detrack occurs and the significance of steps 37 and 38 in FIG. First, in the write / record state M1, writing has been normally performed up to the absolute time (m + 4) frame position of the track TR along the pre-groove, but the next absolute time (m + 5) frame This shows a case where the user cannot move to the position, retreats to the absolute time (m + 3) frame position, and further writes from that position. In the case of the write recording state M2, the writing was normally performed up to the absolute time (m + 4) frame position. However, the writing jumps to the absolute time (m + 6) frame position due to an external impact force or the like, and the writing is performed from that position. Indicates when this was done. In the writing / recording state M1, the absolute time T read during writing at the absolute time (m + 3) frame position returned is (m + 3) frames, but the timer time t is (M + 3) frames. m + 5) frame. Therefore, in step 33 of FIG.
Proceed to steps 34 and 35. At step 37, the absolute time (m + 3) and the previous timer time (m + 4) are stored. (T, t) = ((m + 3), (m + 3) displayed on the display after the writing to the optical disc D is completed.
From 4)), first, since T <t, it can be seen that this detrack (error) is a backward detrack. Therefore, although the writing was normally performed up to the position of the absolute time (m + 4) frame, it can be recognized that the back has been performed to the position of the absolute time (m + 3) frame, and the subsequent writing has been started. That is, the recording state M1 shown in FIG. 3 can be reproduced. Next, in the writing / recording state M2, the absolute time T to be read when writing is performed at the absolute time (m + 6) frame position that has flown forward is (m + 6) frames, but the timer time t is an (m + 5) frame. Accordingly, in step 33 of FIG. 2, the two do not match, and the process proceeds to steps 34 and 35. In step 37, the absolute time (m + 6) and the previous timer time (m + 4)
Is stored. (T, t) = ((m + 6), (m + 6) displayed on the display after the writing to the optical disc D is completed.
From 4)), first, since T> t, it can be seen that this detrack (error) is a detrack that has flown forward. Therefore, although the writing has been normally performed up to the position of the absolute time (m + 4) frame, it can be recognized that the jump to the position of the absolute time (m + 6) frame has been started and the continuation has been started from there. That is, the write recording state M2 in FIG.
Can be reproduced. As is apparent from the above description, according to the present invention, even if there is a writing error, writing is not stopped at that point, so that the efficiency of writing information data to the optical disk can be improved. In addition, in the writing process, the causes of detracking are classified, and the position of the head is corrected according to each cause, so that writing to the optical disc is optimized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an embodiment of a disk recording / reproducing apparatus according to the present invention. FIG. 2 is a processing flowchart of a disk recording / reproducing apparatus according to the present invention. FIG. 3 is an explanatory diagram of a state of writing and recording on an optical disk. [Description of Signs] 14 Microcomputer 20 Error counter 22 Shock sensor D Optical disk M1 Write / record state M2 Write / record state TR Track along pregroove

Continuation of the front page (56) References JP-A-1-144281 (JP, A) JP-A-63-224091 (JP, A) JP-A-63-29322 (JP, A) JP-A-62-273763 (JP, A) JP-A-62-150560 (JP, A) JP-A-59-146445 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/09-7/095 G11B 19/04 G11B 20/18

Claims (1)

(57) [Claims] [Claim 1] Address reproducing means for reproducing the address information from a recordable disc in which address information is previously described, and demodulating the address information reproduced by the address reproducing means. Address demodulating means, address continuity detecting means for detecting whether or not the address information demodulated by the address demodulating means continuously changes, and writing based on the address information demodulated by the address demodulating means. An error counting means for counting the cumulative number of errors during operation; an impact detection sensor for detecting an impact applied to the disk recording / reproducing device; an address detection means for detecting that address information does not change continuously; When the impact detection sensor detects an impact, it is determined that detrack has occurred due to the impact. Discriminating means for detecting that address information does not change continuously in the address detecting means, and judging that detrack has occurred due to a non-impact cause when the impact detecting sensor does not detect an impact; When it is determined by the means that detrack due to an impact has occurred, the address is adjusted so that writing is performed again from the address position at the time of the occurrence of the impact, and the above-described determination means determines that detrack due to a non-impact cause has occurred. Sometimes, if the cumulative number of errors of the error counting means does not increase rapidly, the rewrite address after the detrack is advanced by a first distance , and the cumulative number of errors of the error counting means increases rapidly. And
On the re-write address after the above-mentioned de track in case that is
A recording / reproducing apparatus comprising: a write address control means for advancing by a second distance larger than the first distance .