JPH0487032A - Optical disk device - Google Patents

Abstract

PURPOSE:To search a postscript point in a short time without waiting until the statically determinate time by detecting an additional recording starting position of the recorded information on an optical disk in performing a time code search after moving an optical pickup to a recordable outer circumference of the optical disk until an HF signal cannot be detected. CONSTITUTION:When the optical disk 1 is loaded, the optical pickup 3 is moved to the inner circumferential side of the optical disk 1 while the position of the optical pickup 3 is controlled by a detecting signal from a position sensor 22 fitted to a slide device 4. Then, the slide moving toward the outer circumference is stopped at the time when the HF signal cannot be detected, and then next time, on the contrary, the optical pickup 3 is brought back to the inner circumference of the optical disk 1 until the HF signal can be detected. From this time, an HF signal detecting circuit 7, an EFM demodulation circuit 8 and a subcode extraction circuit 11 are operated, and a subcode signal inputted for the last time when the HF signal cannot be detected is the last point of the already recorded one. By this method, the postscript point can be confirmed by the subcode signal in a short time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a recording and reproducing apparatus for optical discs and the like.

[Conventional technology: Conventionally, playback-only compact discs (hereinafter referred to as CDs)
When recording on an optical disc such as a write-once CD that is compatible with
An empty area is provided for recording f contents), and music signals, etc., are recorded from the outside to the outer periphery. Then, when recording is completed to a predetermined outer circumferential position, or
When it is decided that no further recording will be made on the optical disc, the optical pickup is moved to the TOC area on the inner circumference of the optical disc, and the table of contents information of the songs recorded so far is stored in this T.
The data was recorded in the OC area, and the write-once CD was used as a recording-completed disc.

Therefore, until the table of contents information of a song is recorded in the TOC area, E F M (eight to
The HF signal cannot be detected from the optical big amplifier because the recording pits (forteen Modulation) are not formed, but if multiple songs have already been recorded in the program area around the TOC area, the EFM
Since the bit string is on the disk, it is possible to detect the HF signal. Therefore, in the same way as when playing a playback-only CD, time code (subcode) information can be extracted from the HF signal and searched for the next recording point.

In this way, by tracing the EFM bit string and performing a time code search near the additional writing point, the user moves to the additional writing point.

[Problem to be solved by the invention]

However, it takes time to perform a time code search and move the optical pickup while tracing the EFM pivot column to the point where additional recording is to be performed. This is because the rotation speed of the spindle motor must be in a stable state in order to extract subcode information (time code) from the EFM focus row of the optical disc.

Therefore, when the optical pickup moves over a long stroke distance, the number of revolutions per unit time of the spindle motor becomes CL V (Constant Linear Vel
(ocity) It changes by a maximum of twice or more due to the control method, so it takes time for this to stabilize. After the rotational speed of the spindle motor has stabilized, the time code is read out and it is determined whether the destination has been reached.

If the difference in the number of trunks from the destination is within the search range of only the optical pickup actuator (1, 10 kicks), the time code can be read immediately after the search because there is no discrepancy in the rotational speed of the spindle motor.

As mentioned above, when the optical pick amplifier moves a long stroke distance to prepare for additional recording and searches just before the additional recording point, the wait time for the spindle motor rotation speed to stabilize and read out the time code is shortened. This caused the camera to be unable to enter recording standby mode.

[Means to solve the problem]

Therefore, in the present invention, in order to perform additional recording, the information recorded on the optical disc is moved to the outer periphery of the recordable optical disc until an HF signal is no longer detected. This method is characterized in that the additional recording start position is detected by a second means for performing a post-time code search.

[Effect]

Therefore, when performing a rough search for additional points, even if the optical pink-up moves over a long stroke distance in order to recognize only the presence or absence of an HF signal without recognizing the time code, the number of revolutions per hour of the spindle motor However, it is possible to search for additional points in a short time without waiting for the time to settle.

Embodiment C] FIG. 1 shows a block diagram of an embodiment of the present invention. In the figure, an optical disc 1 is subjected to CLV control by a spindle motor 5, and is given a necessary number of revolutions.

Recorded information on the optical disc 1 is read by an optical pink-up 3 and is applied to an EFM demodulation circuit 8 via a head amplifier 6 and an HF signal detection circuit 7. The output is applied to the system control section 13 via the subcode extraction circuit 11, and the music signal is demodulated via the demodulation circuit 10, and is output to the output terminal 9.

Further, a subcode signal from the system control unit 13 is applied to the EFM modulation circuit 20 via the subcode insertion circuit 16, and a recording signal from the recording signal input terminal 19 is applied to the A/D converter 18 and modulation. Signal processing circuit 1
Added via 7.

The output of the EFM modulation circuit 20 is applied to a laser modulation circuit 21, and the output of the laser modulation circuit 21 is applied to the optical pickup 3. A slide control signal from the system control section 13 is applied to the slide device 4 via the slide drive circuit 12. The optical pickup position detection output from the position sensor 22 and the optical disk placement detection output from the optical disk sensor 2 are transmitted to the system control unit 1, respectively.
Added to 3.

The operation of the above configuration will be explained in detail below.

In FIG. 1, when the power is turned on, the system control unit 13 controls the optical disc I by the output of the optical disc sensor 2.
Check for the presence or absence of. When the optical disk 1 is mounted, the optical pickup 3 is moved toward the inner circumference of the optical disk 1 while controlling the position of the optical pickup 3 based on a detection signal from a position sensor 22 attached to a slide device 4.

The optical disc 1 that has just been placed has N songs already recorded on it.
When additionally recording the N+1 song, an EFM pit string has not yet been formed in the TOC area, but an EFM bit string is present in the program area on the outer periphery of the TOC area.

Therefore, first, the system control unit 13 examines the output signal from the HF signal detection circuit 7 in the TOC area. and,
A signal from the optical pickup 3 is processed by a head amplifier 6, an HF signal detection circuit 7, and an EFM retraining circuit 8, and a subcode signal is extracted by a subcode extraction circuit 11.

Here, for optical discs based on the CD standard, it is T.

Area C (lead-in) contains information on the table of contents of the song. Therefore, if the optical disc has already been recorded, this TOC information will enter the system control unit 13 from the subcode extraction circuit II as a subcode signal, so that the mounted optical disc l will be a write-once type on which all recording has been completed. CD
Or, it is recognized as a play-only CD.

In this way, it can be determined whether or not the mounted optical disc 1 is recordable. If no HF signal is detected here, it is checked whether there is no recording at all on the mounted optical disc l, or whether some songs have already been recorded. For this purpose, the HF signal detection circuit WR shown in Fig.
The system control unit 13 examines the output signal from 7 and determines whether recording is possible or not.

Furthermore, if no HF signal can be detected, the optical disc is completely unrecorded. If an HF signal is detected, check how far it has been recorded. The aforementioned T.O.
The initial position is a little on the outer periphery from the boundary between the C area and the program area, and from there, the HF signal is transmitted via the optical big amplifier 3, head amplifier 6, and HF signal detection circuit 7.
The system control unit 13 controls and moves the slide drive circuit 12 and slide device w4 until the signal is no longer detected.

When the HF signal is no longer detected, the sliding movement toward the outer circumference is stopped, and the optical pickup 3 is returned to the inner circumference of the optical disk l until an HF signal is detected by one kick or the like.

From this point on, the HF signal detection circuit 7, the EFM demodulation circuit 8
, subcode extraction 11 is performed, and the last inputted subcode signal when the HF signal is no longer detected is the point after the already recorded amount. Therefore, the next recordable bond can be confirmed by the subcode signal.

Next, when the mounted optical disc 1 has already recorded up to N songs, a detailed explanation will be given of the sequence in which the optical pink-up 3 is moved to this additional recording point and the optical disc 1 enters recording standby.

Although not shown, when the system control unit 13 receives a recording standby command 14 from a host device, the system control unit 13 moves the optical pickup 3 to the additional writing point on the optical disc. To do this, first, the optical pickup 3 is operated via the slide drive circuit 12 to an initial position set slightly outside the boundary between the TOC area and the program area.

Then, the focus input operation of the optical pink-up 3 and the spindle motor 5 are activated.

The optical disk 1 is slid from this initial position toward the outer periphery of the optical disk until no HF signal is detected from the optical disk 1. The streak 1' operation can be performed in a short time with respect to the position of the optical disc. optical pickup 3,
When the HF signal is no longer detected through the head amplifier 6 and the HF signal output 17, the system control section 13 stops the sliding drive toward the outer periphery. By the time this sliding operation is stopped, due to overshoot, the recording point has gone too far to the outer periphery than the additional writing point.

Therefore, this time, it returns to the inner circumference until an HF signal is detected by one kick or the like. Then, the HF signal detection circuit 7
However, when an HF signal is detected, a subcode (timecode) search is performed at a position corresponding to 2.3 trunk minutes inside from the absolute timecode (elapsed time of the program area) of the subcode signal to be added. .

From the above process, this subcode search has already been performed for several trunks. Therefore, a kick by the tracking actuator of the optical pin group 73 completes the recording and enters recording standby. This time code is track held and a recording start command 15 is awaited.

A flowchart of the above operation is shown in FIG. First, in step S1, the optical pickup is moved to the initial position, and in step S2, the focus servo and spindle motor servo are turned on. Then, from step S3 to step S5, the rough search by sliding to the additional recording point is completed.

This means that the optical pickup has moved to the position where you want to record. Furthermore, from step S6 to step S7
The overshoot caused by the slide movement is then kicked back to the inner circumference until the HF signal is detected.

From step S8, extraction of the subcode obtained from the EFM bit string is started, and from step S9, SIO is performed within 2.3 tracks from the absolute time code (elapsed time of the program area) of the subcode signal to be additionally recorded. A search is performed for a subcode (time code) at a position corresponding to the lap. When the search is completed, the additional recording preparation standby 1' is entered.

〔Effect of the invention〕

As described above, according to the optical disc device of the present invention, when the optical pickup moves a long stroke distance and searches just before the additional writing point in preparation for additional recording, the search can be performed at high speed, and the recording preparation can be carried out at high speed. Operability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a flowchart in FIG. 1. l... Optical disc 2... Optical disc sensor 3... Optical pickup 4... Slide device 5... Spindle motor 6... Head amplifier 7... HF signal detection circuit 8... EFM demodulation circuit 0...Demodulation circuit ■...Subcode extraction circuit 2...Slide drive circuit 3...System'llJm section 6...Subcode insertion circuit 7...Signal processing circuit 8...A/ D converter 0...EFM modulation circuit 1...Laser modulation circuit 2...Position sensor Patent applicant Nippon Columbia Co., Ltd. Agent Patent attorney Kazumi Yamaguchi 2nd

Claims (1)

[Claims] A first means for moving an optical pickup to the outer periphery of the recordable optical disk until an HF signal is no longer detected for information already recorded on the optical disk in order to perform additional recording; and a time code search after the movement of the optical pickup. An optical disc device characterized in that an additional recording start position is detected by a second means for detecting an additional recording start position.