JP4099202B2 - Information recording medium, information recording apparatus, information recording method, and information reproducing apparatus - Google Patents

Description

  The present invention is a recordable WO (Write Once) type recording medium (hereinafter referred to as DVD) among recording media whose recording density is dramatically improved over conventional CD (Compact Disk) and the like represented by DVD. -R (DVD-Recordable))), address information necessary for position search when recording information such as image information on the DVD-R is recorded, or rotation for controlling rotation of the DVD-R. A control information recording apparatus for pre-recording control information such as a control signal (hereinafter referred to as pre-information), a DVD-R on which the pre-information is recorded, and pre-information is reproduced from the DVD-R and originally recorded. It belongs to the technical field of information recording devices for recording the above-mentioned recording information.

  Conventionally, as a recording medium in which pre-information is recorded in advance as described above and information can be additionally recorded based on the pre-information, a CD-R (CD-Recordable) which is an optical disc having a recording capacity comparable to that of a CD. It has been known.

  When the pre-information is recorded on the CD-R, a track (groove track or land track) on which recording information is recorded is recorded in advance at the pre-format stage at the time of manufacturing the CD-R. The pre-information has been recorded by wobbling the information in a waveform at a frequency corresponding to a signal obtained by modulating the information in advance with FM (Frequency Modulation).

  When recording information is actually recorded on a conventional CD-R, the wobbling frequency of the wobbling track is detected, and a reference clock for controlling the rotation of the CD-R based on this is detected. A drive signal for controlling the rotation of the spindle motor that extracts and rotates the CD-R based on the extracted reference clock is generated.

  However, in the method of controlling the rotation of the CD-R based on the pre-information recorded by the conventional wobbling, the wobbling frequency of the track is changed to the position on the CD-R corresponding to the change of the content of the pre-information to be recorded. Therefore, the control for extracting the reference clock by taking the average value of these frequencies has been performed. However, according to this, there is a problem that the rotation control with high accuracy at the time of recording the record information cannot be performed.

  That is, for example, an average value of wobbling frequencies in an area where “0” and “1” should be alternately recorded continuously as pre-information, and an average value of wobbling frequencies in an area where only “0” is continuous as pre-information. The average value of the wobbling frequency in a region where only “1” is continuous as pre-information is naturally different. Accordingly, when the reference clock is extracted based on these average values, the frequency of the extracted reference clock also varies depending on the position of the CD-R, thereby making it impossible to perform highly accurate rotation control.

  Therefore, the present invention has been made in view of the above-mentioned problems, and the problem is that the accuracy of rotation control of the recording medium when recording the recording information on the recording medium on which the pre-information is recorded by wobbling. It is an object to provide a pre-information recording apparatus, a recording medium on which pre-information is recorded, and an information recording apparatus.

In order to solve the above-described problem, the invention according to claim 1 is an information recording medium in which a wobbling track in which a plurality of preset units are formed and recorded in advance is provided. This corresponds to a period for controlling the moving speed of the information recording medium when recording information on the recording medium, and the shape of the wobbling in the same region in each unit is the same, and other than the area of each said unit, characterized by having a wobbled shape corresponding to the pre-information to be recorded.

  In order to solve the above-mentioned problem, in the invention according to claim 3, a wobbled track composed of a plurality of preset units is formed in advance, and the unit records information on the information recording medium. This corresponds to a period for controlling the moving speed of the information recording medium during recording, and the wobbling shapes of the same area in each unit are the same, and other than the area in each unit Is an information recording apparatus for recording recording information on an information recording medium having a wobbling shape corresponding to pre-information to be recorded, wherein the track is irradiated with a light beam and the light beam is reflected from the track. Pickup means for outputting a detection signal based on light, extraction means for extracting the pre-information from the detection signal, and the extracted pre-information Based characterized in that it comprises a recording means for recording the recording information on the recording medium.

  In order to solve the above-mentioned problem, in the invention according to claim 4, a wobbling and a track composed of a plurality of preset units is formed in advance, and the unit records information on the information recording medium. This corresponds to a period for controlling the moving speed of the information recording medium during recording, and the wobbling shapes of the same area in each unit are the same, and other than the area in each unit Is an information recording method for recording recording information on an information recording medium having a wobbling shape corresponding to pre-information to be recorded, wherein the track is irradiated with a light beam, and the light beam is reflected from the track. A detection signal output step of outputting a detection signal based on light; an extraction step of extracting the pre-information from the detection signal; and the extracted pre-information Based characterized in that it comprises a recording step of recording the recording information on the recording medium.

  In order to solve the above-described problem, the invention according to claim 5 is an information recording medium in which a track composed of a plurality of preset units is formed in advance, and the unit includes the information recording medium. This corresponds to a period for controlling the moving speed of the information recording medium when recording information on the medium, and the shape of the wobbling in the same area in each unit is the same, and An information reproducing apparatus for reproducing information recorded on an information recording medium having a wobbling shape corresponding to pre-information to be recorded except for the area in each unit, and irradiating the track with a light beam, Pickup means for outputting a detection signal based on the reflected light from the track of the light beam, and an extractor for extracting the pre-information from the detection signal Characterized in that it comprises a and.

  Next, preferred embodiments of the present invention will be described with reference to the drawings.

(I) Embodiment of Movement Control Information Recording Device and Recording Medium First, pre-pits corresponding to pre-information are formed, and a groove track described later is wobbled corresponding to the pre-information, whereby the pre-information is used as a recording medium. A cutting apparatus which is an embodiment of the movement control information recording apparatus of the present invention for recording on a DVD-R will be described with reference to FIGS. In the following description of the embodiment of the cutting apparatus, an embodiment of a DVD-R as a recording medium in which prepits are formed by the cutting apparatus and the groove track is wobbled will also be described.

  First, the structure of a DVD-R in which prepits are formed and groove tracks are wobbled by a cutting apparatus according to this embodiment described later will be described with reference to FIG.

  In FIG. 1, a DVD-R 1 is a dye-type DVD-R having a dye film 5 and capable of writing information only once. The groove track 2 as a track and the groove track 2 as reproduction light or recording light A land track 3 as an adjacent track for guiding a light beam B such as a laser beam is formed by a cutting device described later. Further, a protective film 7 for protecting them and a gold vapor deposition film 6 for reflecting the light beam B when reproducing recorded information are provided. A pre-pit 4 corresponding to the pre-information is formed on the land track 3 by a cutting device described later. This pre-pit 4 is formed in advance before the DVD-R 1 is shipped.

  Further, in the DVD-R 1, the pre-information having the same contents as the pre-pit 4 is recorded by wobbling the groove track 2 at a frequency corresponding to the pre-information to be recorded and a predetermined constant wobbling frequency described later. Has been. Recording of pre-information by wobbling of the groove track 2 is executed in advance before the DVD-R 1 is shipped by a cutting device described later, like the pre-pit 4.

  When recording information (information such as image information to be originally recorded other than pre-information; the same applies hereinafter) is recorded on the DVD-R 1, the pre-pit 4 and the groove track 2 are recorded in the information recording apparatus described later. The pre-information is acquired in advance by detecting the wobbling frequency, and the optimum output of the light beam B as the recording light is set based on the pre-information, and the address which is the position on the DVD-R 1 where the recording information is to be recorded Information or the like is acquired, and recording information is recorded at a corresponding recording position based on the address information.

  Here, at the time of recording the recording information, the recording information is recorded by forming the recording information pit corresponding to the recording information on the groove track 2 by irradiating the center of the light beam B with the center of the groove track 2. Form. At this time, the size of the light spot SP is set so that a part of the light spot SP is irradiated not only on the groove track 2 but also on the land track 3 as shown in FIG. Then, a push-pull method (a push using a photodetector divided by a dividing line parallel to the rotation direction of the DVD-R1), which will be described later, using a part of the reflected light of the light spot SP irradiated on the land track 3 is used. The pre-information is detected from the pre-pit 4 by the pull method (hereinafter referred to as a radial push-pull method), and the pre-information is acquired. Pre-information is detected from the wobbling frequency of track 2 and the pre-information is acquired.

  Next, a recording format of pre-information recorded by the cutting apparatus according to the present embodiment will be described with reference to FIG. In FIG. 2, the upper row shows the recording format in the recording information, and the lower waveform waveform shows the wobbling state (plan view of the groove track 2) of the groove track 2 on which the recording information is recorded. An upward arrow between two wobbling states schematically shows a position where the prepit 4 is formed. Here, in FIG. 2, the wobbling state of the groove track 2 is shown using an amplitude larger than the actual amplitude for easy understanding, and the recording information is recorded on the center line of the groove track 2.

  As shown in FIG. 2, the record information recorded on the DVD-R 1 in this embodiment is divided in advance for each sync frame as an information unit. In addition, one recording sector is formed by 26 sync frames, and one ECC (Error Correcting Code) block is formed by 16 recording sectors. One sync frame has a length of 1488 times (1488T) a unit length (hereinafter referred to as T) corresponding to the bit interval defined by the recording format when recording the recording information. Furthermore, synchronization information SY for synchronizing each sync frame is recorded in the head portion of 14T length of one sync frame.

  On the other hand, the pre-information recorded on the DVD-R 1 in this embodiment is recorded for each sync frame. Here, when pre-information is recorded on the DVD-R 1 by the pre-pit 4, a sync signal in the pre-information is provided on the land track 3 adjacent to the area where the sync information SY in each sync frame in the record information is recorded. As shown, one pre-pit 4 is always formed, and two or one of the pre-information to be recorded is indicated on the land track 3 adjacent to the first half of the sync frame other than the sync information SY. (The pre-pit 4 may not be formed in the first half of the sync frame other than the synchronization information SY depending on the content of the pre-information to be recorded). At this time, in the present embodiment, in one recording sector, the pre-pit 4 is formed only in even-numbered sync frames (hereinafter referred to as EVEN frames) or only in odd-numbered sync frames (hereinafter referred to as ODD frames). And pre-information is recorded. That is, in FIG. 2, when the prepit 4 is formed in the EVEN frame (indicated by a solid line upward arrow in FIG. 2), the prepit 4 is not formed in the adjacent ODD frame.

On the other hand, when pre-information is recorded by changing the wobbling frequency of the groove track 2, first, the first half of all sync frames is set to a predetermined constant wobbling frequency regardless of the content of the pre-information to be recorded. (in FIG. 2,. indicated by symbol f ₀₎ is wobbled at further second half portion in the sync frame of each is wobbled at a frequency corresponding to the contents of the pre-information to be recorded. In this case, the wobbling frequency in the latter half part of each sync frame has two frequencies (indicated by reference numeral f ₁ or f ₂ in FIG. 2), which will be described later according to the contents of the pre-information to be recorded. They are used separately as shown below. In this embodiment, “0” or “1” in the pre-information to be recorded is expressed by two adjacent sync frames (a pair of EVEN frame and ODD frame).

  Next, a cutting apparatus according to this embodiment for forming the prepit 4 and the groove track 2 shown in FIG. 2 into the shape shown in FIG. 1 in the form shown in FIG. 2 will be described with reference to FIGS.

  First, the configuration of the cutting device according to the embodiment will be described with reference to FIGS. 3 to 6. The cutting apparatus shown in FIGS. 3 to 6 is for manufacturing a stamper disk for mass production of a DVD-R 1 on which pre-pits 4 and wobbling groove tracks 2 are formed and pre-information is recorded. Is.

  First, the overall configuration of the cutting apparatus will be described with reference to FIG.

As shown in FIG. 3, the cutting apparatus C according to the embodiment includes a data generator 20 that generates pre-information _SPP to be recorded, a parallel / serial converter 21 that performs parallel / serial conversion of the pre-information _SPP , a feature of the invention, based on the pre-information S _PP, certain wobbling signal generating means for generating a record pre-information S _R and wobbling signal S _W described later to form the pre-pits 4 and the groove track 2 in the format shown in FIG. 2 The preformat encoder 22 as the control wobbling signal generation means and the pit formation signal generation means, and the clock signal CLK (the period is set to T) used for preformatting to the preformat encoder 22 are output. For the clock signal generator 23 and the DVD-R1 substrate While emitting a light beam L _G to form while wobbling the groove track 2 as shown in 1, a laser generator 24 for emitting a light beam L _L to form the land track 3 and the pre-pit 4 is shown in FIG. 1 A light modulator 25 that modulates the emitted light beam L _L or L _G based on the recording pre-information S _R , an objective lens 26 that focuses the light beams L _G and L _L on the stamper disk, and a stamper disk A spindle motor 29 for rotating the stamper, a rotation detector 30 for detecting the rotation speed of the stamper disk, and servo-controlling the rotation of the stamper disk based on the detected rotation speed, and once per rotation of the stamper disk. a rotation servo circuit 31 for outputting a one rotation detection signal S _S preformat encoder 22, a spiral groove track 2 and the land track 3 to form the spindle motor 29 and the stamper disk in the radial direction of the stamper disk corresponding to the rotation of the stamper disk, and a position detector for detecting the position of the feed unit 32 33, a feed servo circuit 34 for servo controlling the movement of the unit feeding on the basis of the detected position of the feed unit 32, to vibrate the light beam L _G in the radial direction of the stamper disc on the basis of the wobbling signal S _W described later The electromagnet 35 for forming the wobbling groove track 2 is fixed to the optical modulator 25, and the optical modulator 25 is actually vibrated in the radial direction of the stamper disk by the magnetic interaction with the electromagnet 35. the groove track 2 to wobbling by vibrating the light beam L _G It is constituted by a permanent magnet 36 for forming. Here, the laser generator 24 is composed of a beam emitter 24 _G for emitting a light beam _{L G,} by an emitting device 24 _L for emitting a light beam _{L L.} Then, the light beam L _L is modulated based on the recording pre-information S _R by the optical modulator 25, the light beam L _G is not shown DC (direct current) drive and the stamper disc while always maintaining a constant intensity by The stamper disk is irradiated while vibrating in the radial direction. Furthermore, the light beam L _G to form a light beam L _L and the groove track 2 to form the land track 3 is irradiated while shifting the irradiation position in the radial direction of the stamper disc, concentric spiral land track 3 and the groove track 2 Will be formed at the same time.

  On the other hand, the stamper disk is composed of a glass substrate 27 as a stamper disk body, a prepit 4 coated on the glass substrate, and a resist (photosensitive material) 28 for forming each track.

  In the above configuration, the laser generator 24, the light modulator 25, and the objective lens 26 constitute recording means.

  Next, a detailed configuration of the preformat encoder 22 will be described with reference to FIG.

As shown in FIG. 4, the pre-format encoder 22 uses the EVEN frame signal S _E corresponding to the EVEN frame and the ODD at the timing corresponding to each sync frame shown in FIG. 2 based on the input clock signal CLK. outputs the ODD frame signal _{S O} corresponding to the frame, the EVEN frame count signal _{S EC} outputted from the EVEN frame counter described later EVEN frame signal _{S E} corresponding to one of EVEN frame is reset each time that occurs output, further, a frame signal generator 40 for outputting a first frame signal S _H indicating the beginning of recording sectors respectively, in a period corresponding to one round of the stamper disc on the basis of the clock signal CLK and the one rotation detection signal S _S The prepit 4 to be recorded should be formed The sync frame, the ODD · EVEN judging gate signal generator 41 for outputting a gate signal _{S G} for one of the discrimination and or ODD frame is EVEN frame, EVEN frame signal _{S E,} the gate signal _{S G} and Based on the single rotation detection signal S _S , a determination unit 42 that outputs a determination signal S _J for determining whether a sync frame in which the prepit 4 is to be formed is an EVEN frame or an ODD frame, and a leading frame signal _S H, EVEN frame signal _S E, ODD frame signal _{S O,} based on the clock signal CLK and the pre-information _{S PP,} an even record pre-information _{S RE} and for forming a pre-pit 4 corresponding to the EVEN frame of the record information Odd recording pre-information for forming pre-pits 4 corresponding to the ODD frame of the recording information Recording pre-information generator 44 for outputting S _RO, based on the determination signal _{S J,} a switch 43 for outputting an even record pre-information _{S RE} or odd recording pre-information _{S RO} selectively switched, EVEN frame signal S counting the clock signal included in an initialized while the clock signal CLK by using _E as an initialization signal, a counter 45 for outputting a count signal S _C every time the number of clock head and half of the sync frame, based on the count signal S _C and the pre-information S _PP, wobbling signals groove track 2 corresponding to the first half of the sync frame is stored in advance for wobbling by the predetermined constant wobbling frequency f ₀ S _{W (digital} signal) Alternatively, the groove track 2 corresponding to the second half of the sync frame is Information _{S PP} wobbling signal is stored in advance for wobbling by frequency _{f 1} or _{f 2} corresponding to _{S W} ROM for outputting (digital signal) (Read Only Memory) 46, the outputted wobbling signal _{S W} is constituted by a D / a converter 47 for converting the wobbling signal S _W is an analog signal for vibrating the optical modulator 25. In the above configuration, the switch 43 is normally switched to the even number recording pre-information S _RE side.

  Next, detailed configurations of the frame signal generator 40 and the ODD / EVEN determination gate signal generator 41 will be described with reference to FIG.

As shown in FIG. 5, the frame signal generator 40, ODD frame based on the clock signal CLK, and measures the elapsed time from the timing for generating the ODD frame signal _{S O} outputs the ODD frame count signal _{S OC} the use counter 50, based on the clock signal CLK, the EVEN frame counter 51 for outputting the EVEN frame count signal _{S EC} by counting the elapsed time from the timing to generate the EVEN frame signal _{S E,} the counter for ODD frame based on the ODD frame count signal _{S OC} output from the 50, when it is time to be output the next ODD frame signal _{S O,} a decoder 52 for outputting a pulse length 2T as ODD frame signal _{S O,} The EVEN frame output from the EVEN frame counter 51 Based on Mukaunto signal _{S EC,} the count when it is time to be output the next EVEN frame signal _{S E,} a decoder 53 for outputting a pulse length 2T as EVEN frame signal _{S E,} the EVEN frame signal _{S E} The counter 54 that outputs the count signal S _CC as the boundary of the recording sector every time the thirteenth EVEN frame signal S _E is output, and the start frame that indicates the start of the recording sector based on the count signal S _CC It is composed of a decoder 55 for outputting a signal S _H.

On the other hand, as shown in FIG. 5, ODD · EVEN judging gate signal generator 41, based on the EVEN frame count signal _{S EC} and one rotation detection signal _{S S,} one single revolution detection signal _{S S} is input Each time (in other words, every time the stamper disc makes one rotation), a latch circuit 60 for latching the value of the EVEN frame count signal S _EC at that time, on the basis of the clock signal CLK and the one rotation detection signal S _S, A gate that counts while being reset at the same value and cycle as the EVEN frame counter 51 and that is updated to the value recorded in the latch circuit 60 each time the one-turn detection signal _SS is input. a gate counter 61 for outputting a use count signal S _GC, based on the gate count signal S _GC, the value of the gate counter 61 is the maximum value Going on and a mono multivibrator 62 which outputs a gate signal S _G of a predetermined length each time it is reset.

  Next, the configuration of the recording pre-information generator 44 will be described with reference to FIG.

As shown in FIG. 6A, the recording pre-information generator 44 includes an EVEN unit 44E that outputs the even recording pre-information S _RE based on the EVEN frame signal S _E and the clock signal CLK, and an ODD frame signal S. based on the _O and the clock signal CLK, and is constituted by a oDD unit 44O for outputting the odd recording pre-information _{S RO.}

Among, EVEN portion 44E based on the EVEN frame signal _{S E} and the clock signal CLK, and is formed in a region of the pre-pit 4 each in EVEN frames (synchronization signal SY in the EVEN frame in the land track 3 (see FIG. 2) The timing signal S _B0 (formed in the region of the synchronization signal SY in the EVEN frame in the land track 3) indicating the timing at which the one prepit 4 to be formed and the other prepits 4 to be formed in the region other than the synchronization signal SY are to be formed. Corresponding to one pre-pit 4 to be performed) and timing signals S _B1 and S _B2 (corresponding to other pre-pits 4 to be formed in an area in the EVEN frame other than the synchronization signal SY). The generator 65 and the configuration shown in FIG. Timing signal _{S B0, S B1} and _{S B2,} pre-information _{S PP} and the first frame signal _{S H} is input, eventually OR circuit 69, the AND circuit 66 and OR circuit for outputting the even-numbered recording pre-information _{S RE} 67.

On the other hand, ODD unit 44O, based on the ODD frame signal _{S O} and clock signal CLK, and is formed in a region of the pre-pit 4 each in ODD frame (synchronization signal SY in the ODD frame in the land track 3 (see FIG. 2) The timing signal S _B0 (formed in the region of the synchronization signal SY in the ODD frame in the land track 3) indicating the timing at which the power pre-pit 4 and other pre-pits 4 to be formed in the region other than the synchronization signal SY are to be formed. Bit timing generation that outputs timing signals S _B1 and S _B2 (corresponding to other pre-pits 4 to be formed in the region in the ODD frame other than the synchronization signal SY). a vessel 70, the timing signal in the configuration shown in FIG. 6 (a) respectively S _{0, S B1} and _{S B2,} pre-information _{S PP} and the first frame signal _{S H} is inputted is composed of a final AND circuits 71 and 72 and the OR circuit 73 outputs the odd recording pre-information _{S RO.}

Next, the configuration of the bit timing generator 65 or 70 in the recording pre-information generator 44 will be described with reference to FIG. The bit timing generator 65 and the bit timing generator 70 have basically the same configuration. As shown in FIG. 6B, the bit timing generator 65 (70) is initialized by a pulse in each frame signal based on the clock signal CLK and the EVEN frame signal S _E (or ODD frame signal S _O ). In addition, among the clocks in the clock signal CLK, the timing of the seventh clock from the pulse of each frame signal, the timing of the 193rd clock from the pulse of each frame signal, and the 379th clock from the pulse of each frame signal The timing signal S _B0 is output at the timing of the seventh clock from the pulse of each frame signal on the basis of the counter 74 that outputs the count signal S _CCC at each timing, and the count signal S _CCC. The 193rd clock tie from the previous pulse And outputs the timing signal S _B1 in timing, is constituted by a decoder 75 for outputting the timing signal S _B2 at the timing of the 379-th clock pulse of each frame signal.

  Next, the operation of the cutting apparatus C having the above configuration will be described with reference to timing charts shown in FIGS.

First, with reference to FIG. 7 (a), ODD frame signal _S O, EVEN frame signal _{S E,} the operation of the frame signal generator 40 for generating a first frame signal _{S H} and the EVEN frame count signal _{S EC} will be described.

As shown in FIG. 7 (a), whereas pulses are generated at length intervals 1488T frame signal one sync frame showing each sync frame in the ODD frame signal S _O, 1st Pulses having a length of 2T are generated at intervals of twice the frame signal from the timing corresponding to the sync frame. Pulses of the ODD frame signal _{S O} is the ODD frame counter 50, each time a clocking a time corresponding the timing of the first sync frame in 2976T (= 1488T × 2), this time elapses, the decoder At 52, it is generated continuously by repeating the generation of a pulse of length 2T.

On the other hand, in the EVEN frame signal S _E , pulses having a length of 2T are generated at intervals of twice the frame signal from the timing corresponding to the 0th sync frame. The EVEN frame signal _{S E,} as in the case of the ODD frame signal _{S O,} the EVEN frame counter 51, whenever measures the time corresponding to 2976T from the timing of the 0th sync frame, this time elapses Further, it is continuously generated by repeating the generation of a pulse having a length of 2T in the decoder 53. At this time, EVEN frame for counting signal _S EC outputted by the EVEN frame counter 51 is output to the latch circuit 60 of the ODD · EVEN judging gate signal in generator 41.

Further, in the first frame signal S _H, pulses corresponding to twice the length of the frame signal from the timing corresponding to the 0th sync frame (2976T) is generated. For the occurrence of the first frame signal _{S H,} first, the count of the EVEN frame signal _{S E} with the counter 54 at the timing of EVEN frame signal _{S E} corresponding to the 0-th sync frames and outputs a count signal _{S CC} It started, by generating a signal that maintains the value of "H" and becomes thereafter between 2976T "H" in the decoder 55 which receives the count signal _{S CC} as trigger count signal _{S CC,} the first frame signal _{S H} Is generated. Note that, in the counter 54 continues to count also EVEN frame signal _{S E} after outputting the count signal _{S CC,} at the timing of counting pulses of thirteen EVEN frame signal _{S E} output the next count signal _{S CC} To do. Thus, at all times so that the first frame signal S _H is output with a pulse from the beginning of the timing length of 2976T of recording sectors per one recording sector.

Next, the operation of the recording pre-information generator 44 using the EVEN frame signal S _E , the ODD frame signal S _O and the head frame signal S _H , the clock signal CLK and the pre-information S _PP from the frame signal generator 40 will be described. This will be described with reference to FIGS. 4, 6 and 8.

First, the EVEN frame signal S _E , the ODD frame signal S _O , the head frame signal _SH and the clock signal CLK are input to the recording pre-information generator 44 at the timing shown in FIG. At this time, the EVEN frame signal _{S E} and the ODD frame signal _{S O} is always each pulse every two sync frames is input.

The bit timing generators 65 and 70 (including the counter 74 and the decoder 75) to which the EVEN frame signal S _E , the ODD frame signal S _O , the head frame signal _SH and the clock signal CLK are input include the EVEN frame. The count of the clock signal CLK is started using the pulse in the signal S _E or the ODD frame signal S _O as a trigger signal, and the seventh clock and the 193rd clock from the timing when the pulse of the EVEN frame signal S _E or the ODD frame signal S _O is input. At the 379th clock and the 379th clock, the timing signal S _B0 , the timing signal S _B1 and the timing signal S _B2 are output, respectively. At this time, the bit timing generator 65 outputs the timing signal S _B0 , the timing signal S _B1 and the timing signal S _B2 using the EVEN frame signal S _E as a trigger signal, and the bit timing generator 70 outputs the ODD frame signal S _O. The timing signal S _B0 , the timing signal S _B1 and the timing signal S _B2 are output as trigger signals.

The timing signal S _B0 is output at the seventh clock from each frame signal because the pre-pit 4 (first pre-pit 4 in one sync frame) formed corresponding to the timing signal S _{B0. 0} of.), formed within the synchronization information SY in the recording information is recorded (between 14T from the timing of the frame signal), which synchronization signal in the pre-information S _PP recorded by prepits 4 ( This is because the pre-pit B ₀ is formed at a position corresponding to 7T (seventh clock) from the timing of each frame signal so as to be a signal indicating the head in the sync frame).

The reason why the timing signals S _B1 and S _B2 are output at the 193rd clock and the 379th clock from the respective frame signals is as follows. In the DVD-R1 of this embodiment, the pre-information S in the recording of the digital information _SRR is recorded. to facilitate taking the phase synchronization of the time of _PP detection, the pre-pit 4 for recording the pre-information S _PP by recording the pre-pit 4 of the pre-information S _PP by the wobbling groove track 2, the position of the maximum amplitude of the wobbling as described below Is going to form. At this time, a predetermined constant wobbling frequency unrelated above the pre-information S _PP in order to make the constant wobbling frequency at the time of recording the record information can be easily detected, wobbling of 8 Namibun enters the one sync frame Frequency (140 kHz). Therefore, in order to form the second and third pre-pits 4 (hereinafter referred to as pre-pits B ₁ and B ₂ ) in one sync frame in accordance with the wobbling of the constant wobbling frequency, pre-pits B ₀ to 186T are formed. Since it is necessary to output the timing signal S _B1 and the timing signal S _B2 corresponding to the pre-pits B ₁ and B ₂ apart by (1488T ÷ 8), the interval between the timing signals S _B1 and S _B2 is also determined. 186T. For these reasons, the timing signal S _B1 is output at 193T (7 + 186) from each frame signal, and the timing signal S _B2 is output at 379T (7 + 186 × 2) from each frame signal.

Next, the timing signal S _B0 output from the bit timing generator 65 based on the EVEN frame signal S _E is input to the OR circuit 67 as it is, and the timing signal S _B1 is input to the AND circuit 66. The leading frame signal _SH is input to the other input terminal of the AND circuit 66. On the other hand, the timing signal S _B2 is input to the AND circuit 68. The other input terminal of the AND circuit 68 receives the output signal of the OR circuit 69 to which the pre-information _SPP and the head frame signal _SH are input. Finally, the output signal of the AND circuit 66 and the output signal of the AND circuit 68 are input to the other two input terminals of the OR circuit 67, respectively. Therefore, the even recording pre-information S _RE that is an output signal of the OR circuit 67 is based on the timing signals S _B0 , S _B1, and S _B2 during the first sync frame of one recording sector, as shown in FIG. The even-numbered recording pre-information S _RE shown in the fourth row from the bottom is output (in the present embodiment, the pre-information S _PP corresponding to the first sync frame of one recording sector corresponds to “0”). The pre-information _SPP to be set is set in advance.) On the other hand, between the sync frames other than the first sync frame of one recording sector, the pre-information _SPP corresponding to “0” based on the timing signals S _B0 , S _B1 and S _B2 is shown in the lower part of FIG. The even-numbered recording pre-information _SRE shown in the second row is output. For the pre-information _SPP corresponding to “1”, the even-numbered recording pre-information _SRE shown in the lowermost row in FIG. 8 is output.

The timing signal _{S B0} outputted from the bit timing generator 70 based on the ODD frame signal _{S O} is directly input to the OR circuit 73, the timing signal _{S B1} are inputted to the AND circuit 71. The leading frame signal _SH is input to the other input terminal of the AND circuit 71. On the other hand, the timing signal S _B2 is input to the AND circuit 72. The pre-information _SPP is input to the other input terminal of the AND circuit 72. Finally, the output signal of the AND circuit 56 and the output signal of the AND circuit 72 are input to the other two input terminals of the OR circuit 73, respectively. Accordingly, the odd recording pre-information _SRO that is the output signal of the OR circuit 73 is shown in FIG. 8 based on the timing signals S _B0 , S _B1, and S _B2 during the first sync frame of one recording sector. Odd recording pre-information _SRO shown in the third row from the bottom is output. On the other hand, between sync frames other than the first sync frame of one recording sector, based on the timing signals S _B0 , S _B1, and S _B2 , pre-information S _PP corresponding to “0” information S _RE odd recording pre-information S _RO shown in the second row from the bottom 8 of the same as is output, the pre-information S _PP corresponding to "1", the same Figure 8 top and the even recording pre-information S _RE Odd recording pre-information _SRO shown in the lower row is output.

  Next, the operation of the ODD / EVEN determination gate signal generator 41 will be described with reference to FIGS.

As shown in FIG. 9, in the frame signal generator 40, the count signal S _EC for EVEN frame for generating an EVEN frame signal S _E corresponding to the frame signal is generated, the latch circuit 60, one rotation the value of the detection signal _{S S} for counting EVEN frame at the timing that is the input signal _{S EC} latches (stores).

At this time, the gate counter 61 counts while resetting at the same value and cycle as the EVEN frame counter 51 based on the clock signal CLK, but every time one rotation detection signal _SS is input, Is updated to the value stored in the current latch circuit 60, and counting from the value is repeated. That is, the gate counter 61 repeats the same operation as the EVEN frame counter 51 before one rotation in the stamper disk in one rotation immediately after the one rotation. In other words, the output value of the gate counter 61 includes the position information of the prepit 4 recorded in the EVEN frame before one rotation.

Then, the monostable multivibrator 62 every time it is reset the output value becomes the maximum value of the gate counter 61 generates a pulse signal as a gate signal S _G. Therefore, it contains the location information of the pre-pit 4 recorded in the EVEN frame before one rotation to the gate signal S _G. The pulse width of the gate signal S _G, the length 14T of the synchronization pre-information, increase the stamper disc is increased by one rotation in the length of the land track 3 corresponding to the stamper disc one rotation delta (more Specifically, a pulse width of (14T + Δ) is obtained by adding a length corresponding to Δ = 2 × π × (track pitch between land tracks 3).

  Next, operation | movement of the determination device 42 is demonstrated using FIG.7 (b).

As shown in FIG. 7B, in the determination unit 42, when the EVEN frame signal S _E is within the range of the gate signal S _G , normally, even-number recording pre-recording is performed at the rising timing of the EVEN frame signal S _E. In order to switch the switch 43 switched to the information S _RE side to the odd-numbered recording pre-information S _RO side, a determination signal S _J as shown in FIG. 7B is output, whereby the recording pre-information generator 44 odd recording pre-information S _RO is output as a recording pre-information S _R via a switch 43.

Therefore, normally, even-numbered recording pre-information S _RE from the recording pre-information generator 44 is output via the switch 43, so that the pre-pit 4 is formed at the position of the EVEN frame based on the even-numbered recording pre-information S _RE. Thus, the pre-information _SPP is recorded, but when the EVEN frame signal S _E falls within the range of the gate signal S _{G in} the determination unit 42, that is, one rotation before the rotation in the stamper disk. the pre-pit 4 (containing the information to the gate signal _{S G.)} the position of the (pre-pit _B 0, _{B 1} and _{B 2)} is close to the position of the pre-pit in the rotational (position of EVEN frame) (before one rotation when the relative position of the pre-pit 4 are in the range of (14T + Δ)) switches the switch 43 to the odd recording pre-information S _RO side Judgment signal S _J is outputted, the pre-pit 4 in the rotation will be formed at the position of the ODD frame.

When you have one rotation to the position of the ODD frame in a state where the pre-pit 4 is recorded is detected by one rotation detection signal S _S, in the subsequent rotation, to form a pre-pit 4 to the position of the EVEN frame again so, the judgment signal S _J to switch the switch 43 to the even recording pre-information S _RE side is output from the determination unit 42, thereby, the even-numbered recording pre-information S _RE is output as a recording pre-information S _R.

Next, the operation of the counter 45, ROM 46 and D / A converter 47 for generating the wobbling signal _{S W,} will be described with reference to FIGS. 4 and FIG.

First, the counter 45 uses the input EVEN frame signal S _E as an initialization signal, and counts the number of clocks of the clock signal CLK while being initialized each time the EVEN frame signal S _E is input. and outputs the number as a count signal S _C.

Then, the count signal _{S C} and the pre-information _S PP is input as the address data in the ROM 46, thereby ROM 46 is in the counting signal _{S C} and set in advance corresponding to the contents of pre-information _{S PP} in the ROM47 The output value stored in the form of a table is output as a wobbling signal S _W (digital value).

Here, in the present embodiment, the constant wobbling frequency f ₀ is 140 kHz (frequency at which wobbling for 8 waves is included in one sync frame), and the frequencies f ₁ and f ₂ are each 105 kHz (140 kHz × (3/4), that is, the frequency at which wobbling for 3 waves enters a half area of one sync frame) and 175 kHz (140 kHz × (5/4), that is, 5 waves for a half area of one sync frame. The frequency at which wobbling enters is set in advance. The reason why the respective wobbling frequencies are set in this way is to reliably detect all the wobbling frequencies of the groove track 2 wobbled at the respective wobbling frequencies as described above when recording information is recorded. This is also for smooth connection between regions of different wobbling frequencies in each sync frame, that is, for shifting while maintaining the continuity of the shape of the groove track 2 when shifting to a region of different wobbling frequencies. The relationship between the wobbling frequency of the groove track 2 and the presence or absence of each of the prepits 4 (prepits B ₀ , B _1, and B ₂ ) in one EVEN frame and the subsequent ODD frame is that the one EVEN frame is the head of the recording sector. Is set as shown in Table 1 below in correspondence with the content of the pre-information to be recorded in the one EVEN frame and the subsequent ODD frame.

この表において、プリピットの有無の欄の「有」は対応するプリピット４が形成されることを示し、「無」は対応するプリピット４が形成されないことを示しており、夫々の「有」、「無」の組合わせは、図８下から４段目乃至最下段に示す偶数記録プリ情報Ｓ_ＲＥ又は奇数記録プリ情報Ｓ_ＲＯの波形に対応している。すなわち、レコーディングセクタの先頭のシンクフレームにおいては、それがＥＶＥＮフレームである場合には図８下から４段目に示す偶数記録プリ情報Ｓ_ＲＥに対応して全てのプリピット４（プリピットＢ_０、Ｂ_１及びＢ_２）が形成され、レコーディングセクタの先頭のシンクフレームがＯＤＤフレームである場合には図８下から３段目に示す奇数記録プリ情報Ｓ_ＲＯに対応してプリピットＢ_０及びＢ_１のみが形成され、レコーディングセクタの先頭以外のシンクフレームにおいては、当該シンクフレームに記録すべきプリ情報Ｓ_ＰＰが「１」のときには、図８最下段に示す偶数記録プリ情報Ｓ_ＲＥ（又は奇数記録プリ情報Ｓ_ＲＯ）に対応してプリピットＢ_０及びＢ_２のみが形成され、レコーディングセクタの先頭以外のシンクフレームに記録すべきプリ情報Ｓ_ＰＰが「０」のときには、図８下から２段目に示す偶数記録プリ情報Ｓ_ＲＥ（又は奇数記録プリ情報Ｓ_ＲＯ）に対応してプリピットＢ_０のみが形成される。

In this table, “presence” in the column of presence / absence of prepits indicates that the corresponding prepit 4 is formed, and “none” indicates that the corresponding prepit 4 is not formed. The combination of “none” corresponds to the waveform of the even-numbered recording pre-information S _RE or the odd-numbered recording pre-information S _RO shown in the fourth to the bottom of FIG. That is, in the sync frame at the head of the recording sector, if it is an EVEN frame, all the prepits 4 (prepits B ₀ , B) correspond to the even recording pre-information S _RE shown in the fourth row from the bottom in FIG. ₁ and B ₂ ) and the _first sync frame of the recording sector is an ODD frame, only pre-pits B ₀ and B ₁ corresponding to the odd-numbered recording pre-information S _RO shown in the third row from the bottom of FIG. In the sync frame other than the head of the recording sector, when the pre-information _SPP to be recorded in the sync frame is “1”, the even-numbered record pre-information S _RE (or the odd-numbered record only the pre-pit B ₀ and B ₂ in response to information S _RO) is formed, the sink other than the head of the recording sector When the pre-information _SPP to be recorded in the frame is “0”, only the pre-pit B ₀ is formed corresponding to the even-numbered recording pre-information S _RE (or odd-numbered recording pre-information S _RO ) shown in the second row from the bottom of FIG. Is done.

Regarding the wobbling frequency of the groove track 2, in the first sync frame of the recording sector, if it is an EVEN frame, the wobbling frequency of the first half of the EVEN frame is f ₀ (140 kHz), and the wobbling frequency of the second half is f ₂ (175 kHz), the wobbling frequency of the first half of the ODD frame next to the EVEN frame is f ₀ (140 kHz), and the wobbling frequency of the second half is f ₁ (105 kHz). Further, when the first sync frame of the recording sector is an ODD frame, the wobbling frequency of the first half of the ODD frame is f ₀ , the wobbling frequency of the second half is f ₁ , and the first half of the next EVEN frame of the ODD frame is wobbling The frequency is f ₀ and the latter wobbling frequency is f ₂ . Further, in the sync frame other than the head of the recording sector, when the pre-information _SPP to be recorded in the sync frame is “1”, the first sync frame (EVEN frame or ODD frame) is included in the sync frame. ) Is set to f ₀ , the latter half wobbling frequency is f ₂ , the first half wobbling frequency of the second sync frame is f ₀ , and the latter half wobbling frequency is f ₁ . Furthermore, in the sync frame other than the head of the recording sector, when the pre-information _SPP to be recorded in the sync frame is “0”, the first sync frame (EVEN frame or ODD frame) is included in the sync frame. 1), the first half wobbling frequency is f ₀ , the second half wobbling frequency is f ₁ , the first half wobbling frequency of the second sync frame is f ₀ , and the second half wobbling frequency is f ₂ . By combining the wobbling frequencies in this way, a signal for controlling the rotation of the spindle motor is detected by detecting the wobbling frequency f ₀ part in each sync frame as movement control information in the information recording apparatus described later. In addition, by detecting the wobbling frequency f ₁ or f ₂ as control information, the pre-information S _PP (in this embodiment, one pre-information S _PP is recorded in two sync frames in the combination). Is detected). Then, the wobbling frequency of the groove track 2 is stored in the table ROM47 for outputting the wobbling signal S _W so as to obtain the combination shown in Table 1, based on the count signal S _C and pre-information S _PP It outputs the contents of the table as wobbling signal S _W. As the form of storage of the specific ROM 47, for example, the MSB (Most Significant Bit) in the address data pre-information _{S PP,} the count signal _{S C} to the non-MSB in the address data digit (2SB, 3SB ...... LSB ), Data “f ₀ ” − “f ₁ ” − “f ₀ ” − “f ₂ ” for the two sync frames is stored in the addresses “0000” to “0FFF” in the ROM 47, Data “f ₀ ”-“f ₂ ”-“f ₀ ”-“f ₁ ” for the two sync frames is stored in the addresses “1000” to “1FFF”, and the input pre-information _SPP and it may be read any of these as a wobbling signal S _W based on the counter signal S _C.

More specifically, for example, when the pre-information S _PP is “0”, the counter 45 corresponds to each value when the count value of the counter 45 is “0”, “744”, “1488”, and “2232”. and it outputs a count signal _{S C.} This is because the count value is between “0” (the head of the EVEN frame) and “744” (the half position of the EVEN frame) and “1488” (the head of the ODD frame) to “2232” (the half of the ODD frame). 2, the wobbling frequency of the groove track 2 is set to a constant wobbling frequency f ₀ as shown in FIG. 2, and the wobbling frequency of the groove track 2 between the count values “744” and “1488” is 2 and the frequency f ₁ as shown in, than it data is stored to the frequency f ₂ showing the wobbling frequency of the groove track 2 in FIG. 2, for example between up to further count value is then initialized from the "2232" .

When the pre-information S _PP is “1”, the wobbling frequency when the count value of the counter 45 is between “744” and “1488” is set to f ₂ , and the count value is initialized next from “2232”. The data having the wobbling frequency f ₁ until the time of f1 is stored.

Thereafter, the wobbling signal S _W is converted into an analog signal by a D / A converter 47, by the operation of the electromagnet 35 and the permanent magnet 36 based on the wobbling signal S _W which has been converted into the analog signal, the optical modulator 25 By moving (vibrating) in the radial direction of the stamper disk, a groove track 2 wobbling at a desired frequency is formed, and a pre-pit 4 is formed at the head of the sync frame. At the same time, so that the pre-pit 4 is formed at a position of the maximum amplitude in the portion of the wobbling frequency f _0.

When the characteristic features of the operation of the cutting device C of the present embodiment described above are summarized, the operations of the gate signal generator 41 and the determiner 42 for determining the ODD / EVEN in the cutting device C of the present embodiment are described. Thus, when the position of the prepit 4 in the stamper disc before one rotation (usually recorded at the EVEN frame position) is close to the position of the prepit 4 in the next rotation, more specifically, the prepit 4 before one rotation. When the determination unit 42 determines that the EVEN frame signal S _E in the next rotation falls within the range of the gate signal S _{G including} the position information of the pre-pit 4 in the next rotation, recording pre-information S _R is generated so as to be recorded at the position of S _O, Hikaribi by the light modulator 25 based on this The track L _L is modulated, and the land track 3 including the pre-pit 4 is formed on the DVD-R 1. At this time, the groove track 2 so as to parallel to the land track 3 by the light beam L _L simultaneously the outputted light beam L _G is formed. Further, by the movement of the optical modulator 25 based on the wobbling signal S _W, it is irradiated while wobbling the light beam L _G is, the groove track 2 is formed of a wobbling frequency corresponding to pre-information S _PP each pre-pit 4 and to be recorded The

As described above, according to the cutting apparatus C of the present embodiment, the predetermined constant wobbling in which the wobbling frequencies at the same position (first half) are set in advance for the groove tracks 2 corresponding to all the sync frames. Since the frequency f ₀ is used, when recording information is recorded, if the constant wobbling frequency f ₀ is detected and the rotation of the DVD-R 1 is controlled based on the detected frequency, it can be accurately detected in the period of each sync frame. The rotation is controlled based on the constant wobbling frequency f ₀ , and the rotation of the DVD-R 1 in recording of recorded information can be accurately controlled.

Further, as the groove track 2 in one sync frame, in addition to the groove track 2 having the constant wobbling frequency f ₀ , the groove track 2 having the wobbling frequency f ₁ or f ₂ corresponding to the pre-information _SPP to be recorded is formed. since, at the time of recording the record information, it becomes possible to the pre-information S _PP wobbling frequency corresponding to is detected accurately in a cycle of each sync frame, the recording of the record information while performing rotation control of the DVD-R1 accurately Necessary address information and the like can be acquired.

Further, for the groove track 2 in one sync frame, the region wobbled at the constant wobbling frequency f ₀ is the first half of the groove track 2 in the one sync frame. it can be simplified, and further, it is possible to reliably detect both wobbling frequency f ₁ or f ₂ corresponding to the constant wobbling frequency f ₀ and the pre-information S _PP at the time of recording the record information.

Furthermore, in addition to the wobbling of the groove track 2, so pre-information S _PP is recorded by the pre-pit 4, any of the recorded pre-information S _PP by pre-information S _PP or pre-pits 4 which is recorded by wobbling Even when one of them is not detected, the rotation of the DVD-R 1 can be reliably controlled.

Furthermore, according to the cutting device C of the embodiment, when the position of the prepit 4 recorded at the EVEN frame position before one rotation in the DVD-R1 is close to the position of the prepit 4 in the next rotation, the next rotation is performed. In this case, the pre-pit 4 is formed at the position of the ODD frame, and after further one rotation, the pre-pit 4 is formed at the original EVEN frame position, so that the position of the pre-pit 4 overlaps in the adjacent land track 3. it is no, in the detection of pre-information S _PP in the recording of the record information to be described later, when reading the pre-information S _PP on one land track 3, the pre-information S _PP adjacent land track 3 that is Komu leak Therefore, the accurate pre-information _SPP can be read.

At this time, since the gate signal S _G has a pulse width of a length (14T + Δ) including an increase Δ of the length corresponding to one round of the land track 3 per rotation in the stamper disk, the stamper The position of the prepit 4 on the adjacent land track 3 does not approach due to the change of the radial position on the disc. Therefore, in any part on the stamper disk, the position of the prepit 4 on the adjacent land track 3 can be set to a position not on the same straight line in the radial direction.

Further, the length of the section in which the wobbling frequency in one sync frame is f ₀ is not limited to the above-mentioned 1/2 sync frame, and corresponds to at least three prepits 4 ( If the wobbling frequency in the section where the pre-pits B _{0 to} B ₂ ) are formed is f _0, it may have any length within one sync frame.

(II) Embodiment of Information Recording Device Next, an embodiment of an information recording device according to the present invention will be described with reference to FIGS. In the following description, an embodiment in which the present invention is applied to an information recording apparatus for recording digital information transmitted from a host computer onto the DVD-R1 will be described.

  First, the overall configuration and operation of the information recording apparatus according to the present embodiment will be described with reference to FIG. In the following embodiment, in the DVD-R1, the prepit 4 including the address information on the DVD-R1 and the wobbled groove track 2 are formed in advance, and the prepit is recorded when digital information is recorded. 4 and the wobbling frequency of the groove track 2 are detected in advance to obtain address information on the DVD-R1, thereby detecting and recording the recording position on the DVD-R1 where the digital information is recorded.

As shown in FIG. 10, the information recording apparatus S of the embodiment includes a pickup means, a pickup 76 as a recording means, a reproduction amplifier 77, a decoder 78, a pre-pit signal decoder 79, and a spindle motor 80 as a driving means. Servo circuit 81 as drive signal generation means, processor 82, encoder 83, power control circuit 84, laser drive circuit 85, interface 86, filter 88, waveform shaper 89, and extraction means And a control signal extractor 90. In addition, digital information _SRR to be recorded from an external host computer 87 is input to the information recording apparatus S via an interface 86.

  Next, the overall operation will be described.

The pickup 76 includes a laser diode (not shown), a deflected beam splitter, an objective lens, a photodetector, and the like. The pickup 76 irradiates the information recording surface of the DVD-R1 with the light beam B based on the laser drive signal _SDL and applies the reflected light to the reflected light. The digital information _SRR to be recorded is recorded by detecting the wobbling frequency of the pre-pit 4 and the groove track 2 by the radial push-pull method, and if there is already recorded digital information, the light beam B The already recorded digital information is detected based on the reflected light.

The reproduction amplifier 77, the pre-information by amplifying the detection signal S _DT including information corresponding to the wobbling frequency of the pre-pit 4 and the groove track 2, which is outputted from the pickup 76, corresponding to the wobbling frequency of the pre-pit 4 and the groove track 2 and it outputs a signal S _PPP, and outputs an amplified signal S _P corresponding to the digital information that has already been recorded.

Then, the decoder 78 decodes the amplified signal _{S P} by performing 8-16 demodulation and deinterleaving on the amplified signal _{S P,} and outputs a demodulated signal _{S DM} and a servo demodulated signal _{S SD.}

On the other hand, pre-information signal decoder 79 decodes only the signal obtained by detecting the pre-pits 4 included in the pre-information signal S _PPP outputs a demodulated pre-pit signal S _PD.

Then, the servo circuit 81, based on the demodulated pre-pit signal S _PD and the servo demodulated signal S _SD, and outputs a pickup servo signal S _SP for the focus servo control and tracking servo control in the pickup 76. Further, the servo circuit 81 servo-controls the rotation of the spindle motor 80 and outputs a spindle servo control signal S _SS based on the spindle servo signal S _SPS described later.

Along with these, the processor 82 is already outputs a reproduction signal S _OT corresponding to the digital information recorded in the external, mainly controls the entire information recording apparatus S on the basis of the demodulated signal S _DM.

On the other hand, the interface 86 performs an interface operation for taking the digital information _SRR transmitted from the host computer 87 into the information recording apparatus S under the control of the processor 82, and the digital information _SRR is obtained. Output to the encoder 83.

The encoder 83, ECC generator (not shown), 8-16 modulation unit includes a scrambler or the like, on the basis of the digital information _{S RR,} as well as constituting an ECC block which is a unit for performing error correction during reproduction, the ECC The block is subjected to interleaving, 8-16 modulation, and scramble processing to generate a modulated signal S _REE .

Thereafter, the power control circuit 84 outputs a recording signal _SD for controlling the output of a laser diode (not shown) in the pickup 76 based on the modulation signal _SREE .

Further, the laser driving circuit 85 outputs the laser driving signal S _DL for actually driving the laser diode and emitting the light beam B based on the recording signal _SD .

On the other hand, the filter 88 extracts only the wobbling frequency of the groove track 2 included in the pre-information signal S _PPP , and outputs an extraction signal S _P1 corresponding to each wobbling frequency (the frequencies f ₀ , f ₁ and f ₂ ). To do.

Then, the extracted signal S _P1 is output to the waveform shaper 89, and a shaped signal S _P2 having each original wobbling frequency is output even if the noise included in the extracted signal S _P1 is removed.

Finally, the control signal extractor 90 outputs the spindle servo signal S _SPS based on the shaping signal S _P2 and uses the address information included as a combination of wobbling frequencies in the shaping signal S _P2 as the address signal S _DTT. Output to the processor 82.

The above information recording apparatus S is also possible to reproduce the information recorded on the DVD-R1, At this time, the reproduction signal S _OT through the processor 82 on the basis of the demodulated signal S _DM It will be output to the outside.

  Next, detailed configurations of the filter 88, the waveform shaper 89, and the control signal extractor 90 according to the present invention will be described with reference to FIG.

As shown in FIG. 11, the filter 88 extracts the wobbling frequency from the A / D converter 91 that converts the pre-information signal S _PPP , which is an analog signal, into a digital signal, and the digitized pre-information signal S _PPP. And a band-pass filter 92 that passes only the pre-information signal S _PPP having a frequency of 105 kHz to 175 kHz.

  The waveform shaper 89 includes a switch 94, a delay circuit 95, a window comparator 96, and a prediction calculator 93.

  The control signal extractor 90 includes a comparator 97, an edge extractor 98, a counter 99, a hold device 100, a window comparator / comparator 101, and a data determination circuit 102.

  Next, the operations of the filter 88, the waveform shaper 89, and the control signal extractor 90 will be described with reference to FIGS.

The pre-information signal S _PPP output from the regenerative amplifier 77 is input to the filter 88 and converted into a digital signal, and then only the frequency component corresponding to the wobbling frequency of the groove track 2 is extracted and output as the extracted signal _SP1. The

The extracted signal _SP1 is output to the switch 94 (usually switched to the extracted signal _SP1 side) in the waveform shaper 89, and also to the delay circuit 95 and the window comparator 96. Then, the extracted signal _SP1 is delayed for a predetermined time by the delay circuit 95, the amplitude of the delayed signal and the amplitude of the current extracted signal _SP1 are compared by the window comparator 96, and the delayed signal is compared with the current signal. A difference in amplitude from the extracted signal _SP1 is detected, and when the difference is larger than a predetermined value set in advance, the switch 94 is switched from the extracted signal _SP1 side to the output signal side of the predictive calculator 93 described later. This operation, as shown in FIG. 12 uppermost, the extraction signal S _P1 in impulse noise (FIG. 12 top by the pre-pit 4 on the land track 3 adjacent to the groove track 2, indicated by the solid line arrows .) are included, in order to remove it, the signal delayed and the current extraction signal S _P1 compared in the window comparator 96, and when the difference is the predetermined value or greater than the extraction of current as the signal S _P1 contains the impulse noise, without outputting the current extraction signal S _P1 as shaping signal S _P2 from the switch 94, it shapes the output signal of the prediction calculator 93 instead of this This is because the signal _SP2 is output.

Here, the predictive calculator 93 predicts and outputs the amplitude value of the current extracted signal _SP1 from the average value of the amplitude of the extracted signal _SP1 one or several samples before, for example,
(Amplitude value in the previous sample) + (Average change) = (Amplitude value of the current extraction signal _SP1 )
The calculated current amplitude value is output to the switch 94.

The extracted signal S _P1 from which the impulse noise has been removed in this way is output to the control signal extractor 90 as the shaped signal S _P2 .

Then, the comparator 97 in the control signal extractor 90 binarizes the shaping signal S _P2 and outputs a comparison signal S _P3 having three types of pulse lengths corresponding to changes in the frequency (wobbling frequency). Thus, the edge extractor 98 extracts the edge of the comparison signal S _P3, and outputs the edge signal S _P4 having three types of intervals corresponding to original wobbling frequency as shown in FIG. 12. The edge signal _SP4 is output to the counter 99, the hold device 100, the window comparator / comparator 101, and the data determination circuit 102.

Counter 99 the edge signal S _P4 is input, counts the clock signal CLK, which is input separately the edge signal S _P4 as a trigger signal, counts the count value at that time every time the edge signal S _P4 is input Output as signal _SP5 . The count signal _SP5 includes three types of values (indicated by “K”, “L”, and “M” in FIG. 12) corresponding to the original wobbling frequency. Thereafter, the hold device 100 to which the count signal _SP5 is input holds each value of the count signal _SP5 based on the edge signal _SP4 , and corresponds to the three types of values included in the count signal _SP5 . A hold signal _SP6 having a ternary level is output. The window comparator / comparator 101 to which the hold signal _{S P6} is input, based on the edge signal _{S P4,} the hold signal _{S P6} inputted, corresponding to the original wobbling frequency _{f 0} in the count signal _{S P5} and level to generate a spindle servo signal S _SPS having two levels of the level corresponding to the other values in the count signal S _P5, and outputs to the servo circuit 81. Since this spindle servo signal S _SPS is a signal having a period of exactly one sync frame regardless of the value of the pre-information S _PP , the spindle servo signal S _SPS having this waveform is output to the servo circuit 81, By comparing this with a preset reference signal, it is possible to accurately detect the deviation of the current DVD-R1 from the reference value.

On the other hand, the window comparator / comparator 101 in parallel with this, corresponding to the input hold signal S _P6 in three original from the level of the address signal recorded by wobbling frequency ( "0" or "1" 105kHz and outputs the _{signal) S P7} indicating the frequency or 175kHz in the data judgment circuit 102. Then, the data determination circuit 102 is responsive to address signals _{S P7} and demodulated pre-pit signal _{S PD,} are you currently detected by the demodulated pre-pit signal _{S PD} has been recognized that an EVEN frame, and the address signal S when wobbling frequency which is currently detected by _P7 is 175kHz outputs the address signal S _DTT indicating this as pre-information S _PP is "1" which is detected currently processor 82. On the other hand, been recognized that are you currently detected by the demodulating pre-pit signal S _PD is EVEN frame and the pre being detected current when wobbling frequency which is currently detected by the address signal S _P7 is 105kHz _Assuming that the information _SPP is “0”, an address signal S _DTT indicating this is output to the processor 82.

The data determination circuit 102 is recognized that that are currently detecting an ODD frame by demodulating the pre-pit signal S _PD, and, when a wobbling frequency which is currently detected by the address signal S _P7 is 175kHz is An address signal S _DTT indicating that the pre-information S _PP currently detected is “0” is output to the processor 82. On the other hand, been recognized that are you currently detected by the demodulating pre-pit signal S _PD is ODD frame, and the pre being detected current when wobbling frequency which is currently detected by the address signal S _P7 is 105kHz The address signal S _DTT indicating that the information _SPP is “1” is output to the processor 82.

Then, the processor 82 the address signal _{S DTT} is input, that on the basis with the address signal _{S DTT} in the demodulated pre-pit signal _{S PD,} to obtain the address information on the DVD-R1 to be recorded the current digital information _{S RR} It becomes.

Note that the address signal S _DTT and the demodulated pre-pit signal S _PD contain the same address information. Normally, the address information is acquired based on the demodulated pre-pit signal S _PD. Address information S _DTT is reserved, and address information is acquired based on address signal S _DTT only when demodulated pre-pit signal S _PD is not detected due to noise or the like.

As described above, according to the information recording apparatus S of the present embodiment, regardless of the value of the pre-information S _PP, currently based on the spindle servo signal S _SPS is exactly signal having a period of one sync frame Since the deviation of the rotational speed of the DVD-R1 from the reference value is accurately detected and the spindle servo control signal _SSS is generated to control the rotation of the spindle motor 80, the accuracy corresponding to the actual rotational speed of the DVD-R1 Rotation control is possible.

Further, since the pre-information _SPP is also recorded by wobbling the groove track 2 on the DVD-R1, it is possible to acquire the address information necessary for recording the recorded information while accurately controlling the rotation of the DVD-R1. .

Furthermore, the first half of one sync frame is a constant wobbling frequency f _0, the second half part because it is the wobbling frequency corresponding to pre-information S _PP, it is possible to record the record information is reliably detect both .

Furthermore, since the pre-information S _PP is recorded by prepits 4 to DVD-R1, the pre-information for the recorded rotation control by pre-information S _PP or pre-pits 4 for the rotation control recorded by wobbling even if one of the S _PP is not detected, it is possible to reliably record information by controlling the rotation of the DVD-R1.

  In each of the above embodiments, the case where the present invention is applied to the DVD-R1 has been described. However, the present invention is not limited to this, and a recording medium that detects information for movement control by wobbling a track (for example, tape-like recording) The present invention can be widely applied to recording information for each predetermined information unit on a medium or the like.

It is a perspective view which shows an example of a structure of DVD-R of embodiment. It is a figure which shows an example of the recording format in DVD-R of embodiment. It is a block diagram showing a schematic structure of a cutting device of an embodiment. It is a block diagram which shows the outline | summary structure of the preformat encoder of embodiment. It is a block diagram which shows the schematic structure of the frame signal generator of embodiment, and the gate signal generator for ODD * EVEN determination. FIG. 2 is a block diagram showing a schematic configuration of a recording pre-information generator and a bit timing generator of the embodiment, (a) is a block diagram showing a schematic configuration of a recording pre-information generator, and (b) is a bit timing generator. FIG. 2 is a timing chart showing the operation of the pre-format encoder, (a) is a timing chart showing the EVEN frame signal and ODD frame signal, and (b) is a timing chart showing the operation of the determiner. It is a timing chart which shows operation | movement of a recording pre-information generator. It is a timing chart which shows operation | movement of a frame signal generator and the gate signal generator for ODD * EVEN determination. It is a block diagram which shows schematic structure of an information recording device. It is a block diagram which shows the detailed structure of a filter, a waveform shaper, and a control signal extractor. It is a timing chart which shows operation | movement of a filter, a waveform shaper, and a control signal extractor.

Explanation of symbols

1 DVD-R
2 Groove Track 3 Land Track 4 Prepit 5 Dye Film 6 Gold Deposition Film 7 Protective Layer 20 Data Generator 21 Parallel / Serial Converter 22 Preformat Encoder 23 Clock Signal Generator 24, 24 _G , 24 _L Laser Generator 25 Light Modulator 26 Objective lens 27 Glass substrate 28 Resist 29, 80 Spindle motor 30 Rotation detector 31 Rotation servo circuit 32 Feed unit 33 Position detector 34 Feed servo circuit 40 Frame signal generator 41 ODD / EVEN determination gate signal generator 42 Determinator 43 Switch 44 Recording pre-information generator 44E EVEN unit 44O ODD unit 45, 54, 74, 99 Counter 46 ROM
47 D / A converter 50 ODD frame counter 51 EVEN frame counter 52, 53, 55, 75, 78 Decoder 60 Latch circuit 61 Gate counter 62 Mono multivibrator 65, 70 Bit timing generator 66, 68, 71, 72 AND circuit 67, 69, 73 OR circuit 76 Pickup 77 Reproduction amplifier 79 Prepit signal decoder 81 Servo circuit 82 Processor 83 Encoder 84 Power control circuit 85 Laser drive circuit 86 Interface 87 Host computer 88 Filter 89 Waveform shaper 90 Control signal extractor 91 A / D converter 92 Band pass filter 93 Prediction calculator 94 Switch 95 Delay circuit 96 Window comparator 97 Comparator 98 Edge extractor 100 E Field 101 window comparator / comparator 102 data judging unit C cutting apparatus CLK clock signal S information recording apparatus _L L, L G, B light beam SP light spot S _PP pre-information S _R recording pre-information S _S single revolution detection signal S _E EVEN frame signal S _EC EVEN frame count signal S _O ODD frame signal S _OC ODD frame count signal S _J decision signal _{S C, S CC, S CCC} , S P5 count signal S _W wobbling signal S _G gate signal S _H head frame signal S _RE even recording pre information S _RO odd recording pre information S _GC gate count signal S _B0 , S _B1 , S _B2 timing signal S _RR digital information S _REE modulation signal S _D recording signal S _DT detection signal S _DL laser drive signal S _OT Raw signal S _P amplified signal S _PPP pre-pit signal S _DM demodulated signal S _SD servo demodulated signal S _PD demodulated pre-pit signal S _SP pickup servo signal S _SPS spindle servo signal S _SS spindle servo control signal S _{DTT, S P7} address signal S _P1 extract Signal _SP2 shaping signal _SP3 comparison signal _SP4 edge signal _SP6 hold signal

Claims (5)

An information recording medium in which a track composed of a plurality of wobbling and preset units is formed and recorded in advance.
The unit corresponds to a cycle for controlling the moving speed of the information recording medium when recording information is recorded on the information recording medium.
The wobbling shape of the same region in each unit is the same as each other, and the wobbling shape other than the region in each unit has a wobbling shape corresponding to pre-information to be recorded . The information recording medium according to claim 1,
The information recording medium according to claim 1, wherein each of the areas is wobbled at a predetermined constant wobbling frequency. A track composed of a plurality of units that are wobbled and set in advance is formed in advance, and the unit corresponds to a cycle for controlling the moving speed of the information recording medium when recording information is recorded on the information recording medium. In addition, the wobbling shape of the same area in each unit in each unit is the same, and the area other than the area in each unit has a wobbling shape corresponding to pre-information to be recorded. An information recording apparatus for recording recorded information,
Pick-up means for irradiating the track with a light beam and outputting a detection signal based on reflected light from the track of the light beam;
Extraction means for extracting the pre-information from the detection signal;
Recording means for recording the recording information on the recording medium based on the extracted pre-information;
An information recording apparatus comprising: A track composed of a plurality of units that are wobbled and set in advance is formed in advance, and the unit corresponds to a cycle for controlling the moving speed of the information recording medium when recording information is recorded on the information recording medium. In addition, the wobbling shape of the same area in each unit in each unit is the same, and the area other than the area in each unit has a wobbling shape corresponding to pre-information to be recorded. An information recording method for recording recorded information,
A detection signal output step of irradiating the track with a light beam and outputting a detection signal based on reflected light from the track of the light beam;
An extraction step of extracting the pre-information from the detection signal;
A recording step of recording the recording information on the recording medium based on the extracted pre-information;
An information recording method comprising: An information recording medium in which tracks composed of a plurality of preset units are formed in advance, and the unit is a moving speed of the information recording medium when recording information is recorded on the information recording medium And the wobbling shape of the same area in each unit in each unit is the same, and the wobbling corresponding to the pre-information other than the area in each unit is recorded. An information reproducing apparatus for reproducing information recorded on an information recording medium having a shape,
Pick-up means for irradiating the track with a light beam and outputting a detection signal based on reflected light from the track of the light beam;
Extraction means for extracting the pre-information from the detection signal;
An information reproducing apparatus comprising:

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