JP3917535B2 - Information recording method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a WO (Write Once) type that can be additionally written among information recording media represented by a DVD (Digital Video Disk) and having a recording density dramatically improved over a conventional CD (Compact Disk) or the like. For information recording media (hereinafter referred to as DVD-R (DVD-Recordable)), control information such as address information or synchronization signals required for recording and reproduction of recording information such as image information on the DVD-R ( Control information recording method and apparatus for pre-recording pre-information) and information recording for recording pre-information from a DVD-R on which the pre-information is recorded and recording the recording information that should be recorded The present invention relates to a method and an apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an information recording medium such as an additionally recordable optical disk, pre-information for position search when recording information is written is recorded on the information recording medium in advance at a pre-format stage at the time of manufacturing the information recording medium. As a method for pre-formatting this pre-information, conventionally, information recording tracks (groove tracks or land tracks) for recording information are wobbled in a wavy pattern, or pre-information is recorded, or information for recording information is recorded. Recording was performed by forming prepits in a portion different from the portion for recording the recording information on the recording track.
[0003]
[Problems to be solved by the invention]
However, in the case of pre-formatting of pre-information by wobbling, the information recording track itself is swung to the left and right with respect to the rotation direction of the information recording medium based on the wobbling signal. There is a problem that the degree of modulation (wobbling amplitude) is limited and the C / N ratio (Carrior to Noise ratio) is poor. Further, since the adjacent information recording track is approached by wobbling, the interference between the adjacent information recording track is taken into consideration, the track pitch cannot be reduced so much, and there is a limit in improving the recording density. There was also.
[0004]
On the other hand, in the case of pre-formatting pre-information using pre-pits, since the pre-pits are formed on the information recording track, the original information cannot be recorded as much as the pre-pits are formed, and the use efficiency of the disk recording surface is poor. There was a point.
[0005]
Therefore, the present invention has been made in view of the above-described problems, and its problem is to improve the recording density of recorded information and to an information recording medium on which pre-information that can be accurately reproduced is recorded. On the other hand, it is an object to provide an information recording method and apparatus for recording recorded information that can be accurately reproduced.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1 is an information recording method for recording record information on an information recording medium, wherein the information recording medium is information for recording record information. Pre-information including a recording track and address information indicating a position on the information recording medium and having an interval corresponding to the length of a pre-information unit obtained by multiplying the length of the information unit in the recording information by a predetermined integer number of 2 or more And a guide track on which pre-pits that are pit rows corresponding to the information recording method are formed, and the information recording method detects the pre-information from the information recording medium, and corresponds to the detected pre-information. to, a generation step of generating the recording information synchronizing signal is added to each of the information unit, and the top the pre-information of the length of at least the information unit, the sync signal and So that the position overlapping in a direction perpendicular to the guide track, the record information said generated and a recording step of recording on the information recording track.
[0007]
In order to solve the above-mentioned problem, the invention according to claim 7 is an information recording apparatus for recording record information on an information recording medium, wherein the information recording medium is information for recording record information. Pre-information including a recording track and address information indicating a position on the information recording medium and having an interval corresponding to the length of a pre-information unit obtained by multiplying the length of the information unit in the recording information by a predetermined integer number of 2 or more And a guide track on which pre-pits corresponding to pits are formed, and the information recording apparatus detects detection of the pre-information from the information recording medium, and corresponds to the detected pre-information. to, a generation unit for generating the record information which the synchronization signal is added to each of the information unit, and the top the pre-information of the length of at least the information unit, the sync signal and Such that the position overlapping in a direction perpendicular to the guide track, the record information said generated and a recording means for recording on the information recording track.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, preferred embodiments of the present invention will be described with reference to the drawings.
[0009]
(I) in embodiment <br/> beginning of the cutting device, embodiments of the cutting device for forming a pre-pit corresponding to the pre-information is an embodiment corresponding to the present application, with reference to FIGS Description To do. In the following description of the embodiment of the cutting apparatus, an embodiment of a DVD-R as an information recording medium corresponding to the present application in which pre-pits are formed by the cutting apparatus will also be described.
[0010]
First, the structure of a DVD-R in which pre-pits are formed by a cutting apparatus according to this embodiment described later will be described with reference to FIG.
[0011]
In FIG. 1, DVD-R 1 is a dye-type DVD-R having a dye film 5 and capable of writing information only once. A groove track 2 as an information recording track and reproduction light or recording light on the groove track 2 are recorded. A land track 3 as a guide 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.
[0012]
When recording information (information such as image information to be originally recorded other than pre-information) is recorded on the DVD-R 1, pre-information is acquired in advance by detecting the pre-pit 4 in an information recording apparatus described later. Based on this, the optimum output of the light beam B as the recording light is set and the address information, etc., which is the position on the DVD-R1 where the recording information is to be recorded is acquired, and the recording information is based on this address information. Are recorded at the corresponding recording positions.
[0013]
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, the pre-information is acquired by detecting pre-information from the pre-pit 4 by the tangential push-pull method described later using a part of the reflected light of the light spot SP irradiated on the land track 3.
[0014]
Next, before specifically describing the cutting apparatus of the present embodiment, a recording format of pre-information recorded by the cutting apparatus of the present embodiment will be described with reference to FIG.
[0015]
As shown in FIG. 2, the pre-information of this embodiment is recorded for each sync frame as an information unit. Furthermore, one recording sector as an information unit string is formed by 26 sync frames. One ECC (Error Correcting Code) block is formed by 16 recording sectors. Furthermore, one sync frame has a length of 1488 times (1488T) a unit length (hereinafter referred to as T) corresponding to a bit interval defined by a recording format when recording information is recorded. .
[0016]
Here, the pre-information is recorded in the head portion of 14T length of each sync frame. At this time, in the present embodiment, even-numbered sync frames are recorded in one recording sector. The pre-information is recorded only in (hereinafter referred to as an EVEN frame) or only in an odd-numbered sync frame (hereinafter referred to as an ODD frame). The pre-information to be recorded is classified into synchronous pre-information and data pre-information. Of these, the pre-information is recorded at the position of the sync frame where the pre-information at the beginning of each recording sector is to be recorded. The synchronization pre-information (EVEN synchronization pre-information) recorded in the EVEN frame and the synchronization pre-information (ODD synchronization pre-information) recorded in the ODD frame are recorded in different patterns as shown in FIG. Is read at the time of recording information to be described later, it can be determined whether the pre-information is recorded in the EVEN frame or the ODD frame.
[0017]
On the other hand, the data pre-information is distributed and recorded in a plurality of sync frames. In one sync frame, the data pre-information corresponding to “1” is recorded with a length of 2T as shown in FIG. The
[0018]
FIG. 2 shows information in which pre-information is recorded in the EVEN frame in the recording sector 0 and pre-information is recorded in the ODD frame in the recording sector 2.
[0019]
Furthermore, the recording information recorded based on the pre-information detected by the information recording apparatus described later is recorded in the same format as the recording format shown in FIG. At this time, in the recording information, data such as image information to be recorded is recorded in a position other than the first 14T in one sync frame. However, in the pre-information, the first information is recorded in the first sync frame. No information is recorded at positions other than 14T.
[0020]
Next, a cutting apparatus according to this embodiment for forming the prepit 4 having the recording format shown in FIG. 2 as shown in FIG. 1 will be described with reference to FIGS.
[0021]
First, the configuration of the cutting apparatus according to the embodiment will be described with reference to FIGS. 3 to 5. 3 to 5 is for manufacturing a stamper disk for mass production of a DVD-R1 corresponding to the information recording medium of the present application in which pre-pits 4 are formed and pre-information is recorded according to the present application. belongs to.
[0022]
First, the overall configuration of the cutting apparatus will be described with reference to FIG.
[0023]
As shown in FIG. 3, the cutting apparatus C according to the embodiment includes a data generation unit 20 that generates data pre-information _SPP to be recorded, a parallel / serial converter 21 that performs parallel / serial conversion on the data pre-information _SPP , and a feature of the present invention, based on the data pre-information S _PP, the pre-format encoder 22 to generate a record pre-information S _R for forming the pre-pits 4 in the recording format shown in FIG. 2, the pre-format encoder 22 On the other hand, a clock signal generator 23 for outputting a clock signal CLK (period is T) used for pre-formatting, and a groove track 2 shown in FIG. 1 are formed on the substrate of DVD-R1. light for forming as well as emitting a light beam L _G, the land track 3 and the pre-pit 4 is shown in Figure 1 for A laser generator 24 for emitting a beam L _L, a light modulator 25 for modulating based on the emitted light beam L _L to record pre-information S _R, condensing the light beam L _G and L _L on the stamper disc The objective lens 26, the spindle motor 29 for rotating the stamper disk, the rotation detector 30 for detecting the rotation speed of the stamper disk, the servo control of the rotation of the stamper disk based on the detected rotation speed, and the stamper a rotation servo circuit 31 for outputting a one rotation detection signal S _S once to one rotation of the disk pre-format encoder 22, in order to form a spiral groove track 2 and the land track 3, the rotation of the stamper disc Correspondingly, a feed unit 32 for feeding the spindle motor 29 and the stamper disk in the radial direction of the stamper disk; A position detector 33 for detecting the position of the feed unit 32 is constituted by a feed servo circuit 34 for servo controlling the movement of the feed unit based on the detected position of the feed unit 32. 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 irradiated on the stamper disc while always maintaining a constant intensity by a not-shown DC (direct current) drive Is done. 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.
[0024]
On the other hand, the stamper disk includes a glass substrate 27 as a stamper disk body and a resist (photosensitive material) 28 for forming prepits coated on the glass substrate.
[0025]
Next, a detailed configuration of the preformat encoder 22 will be described with reference to FIG.
[0026]
As shown in FIG. 4, the preformat encoder 22 is based on the input clock signal CLK, and based on the timing of the frame signal indicating each sync frame shown in FIG. 2, the EVEN frame signal S _E corresponding to the EVEN frame. When outputs the ODD frame signal S _O corresponding to ODD frame, EVEN frame count signal 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 and frame signal generator 40 for outputting a S _EC, or the EVEN frame sync frames forming a pre-pit 4 to be recorded in the 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 Whether it is an ODD frame Sink and ODD · EVEN judging gate signal generator 41 for outputting a gate signal S _G, based on the EVEN frame signal S _E and the gate signal S _G and one rotation detection signal S _S, to be recorded prepits 4 for A determination unit 42 that outputs a determination signal S _J for determining whether the frame is an EVEN frame or an ODD frame, and an EVEN frame signal S _E or an ODD frame signal S _O based on the determination signal S _J Of the switch 43 for selectively switching between the EVEN frame signal S _E or the ODD frame signal S _O output from the switch 43 and the data pre-information _SPP output from the parallel / serial converter 21. An AND circuit 44 that calculates a product and outputs a logical product signal S _A , and an EVEN frame signal S _E output from the switch 43 Corresponds to either the sync pattern in the sync pre-information recorded in the EVEN frame or the sync pattern in the sync pre-information recorded in the ODD frame using the determination signal S _J based on the ODD frame signal S _O. A sync pattern generator 45 for outputting a sync signal S _Y and a data latch pulse S _L for controlling a delay amount in a later-described delay flip-flop circuit 47, and an EVEN frame signal S _E or ODD output from the switch 43 Based on the frame signal S _O , a sync / data switching signal generator 46 for outputting a sync / data switching signal S _C for switching between synchronous pre-information and data pre-information, a data latch pulse S _L and a logical product signal S _A Based on this, the logical product signal S _A is obtained by delaying the logical product signal S _A by 2T period. Configuration and delay flip-flop circuit 47 which outputs a _D, sync / data switching based on the signal S _C, switches the delayed logical product signal S _AD or sink signal S _Y, by a switch 48 for outputting a recording pre-information S _R Has been. In the above configuration, the switch 43 is normally switched to the EVEN frame signal S _E side. The switch 48 is normally switched to the delayed logical product signal _SAD side.
[0027]
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.
[0028]
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 Counter 50, EVEN frame counter 51 that counts the elapsed time from the timing at which EVEN frame signal S _E should be generated based on clock signal CLK, and outputs EVEN frame count signal S _EC , and ODD frame counter A decoder 52 that outputs a pulse having a length of 2T as an ODD frame signal S _O when it is time to output the next ODD frame signal S _O based on the ODD frame count signal S _OC output from 50; EVEN frame count output from the EVEN frame counter 51 No. Based on S _EC, when it is time to be output the next EVEN frame signal S _E, is composed of a decoder 53 for outputting a pulse of a length 2T as EVEN frame signal S _E.
[0029]
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 resetting at the same value and cycle as the EVEN frame counter 51 and updates the value to the value recorded in the latch circuit 60 each time the one rotation 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 becomes the maximum reset And a mono multivibrator 62 which outputs a gate signal S _G of a predetermined length each time it is.
[0030]
Next, the operation of the cutting apparatus C having the above configuration will be described with reference to timing charts shown in FIGS.
[0031]
First, the operation of the frame signal generator 40 that generates the ODD frame signal S _O and the EVEN frame signal S _E will be described with reference to FIG.
[0032]
As shown in FIG. 6A, the frame signal has a pulse generated at an interval of the length 1488T of one sync frame, whereas the ODD frame signal S _O has a timing corresponding to the first sync frame. Thus, pulses having a length of 2T are generated at intervals of twice the frame signal. 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.
[0033]
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. As in the case of the ODD frame signal S _O , the EVEN frame signal S _E measures time corresponding to 2976T from the timing of the 0th sync frame in the EVEN frame counter 51, and every time 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.
[0034]
Next, the operation of the ODD / EVEN determination gate signal generator 41 will be described with reference to FIG.
[0035]
As shown in FIG. 7, 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).
[0036]
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 S _S 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 value of the gate counter 61 includes the position information of the prepit 4 recorded in the EVEN frame before one rotation.
[0037]
The mono multivibrator 62 generates a pulse signal as the gate signal S _G every time the gate counter 61 is reset to the maximum value. Accordingly, the gate signal S _G also includes the position information of the prepit 4 recorded in the EVEN frame before one rotation. The pulse width of the gate signal S _G is increased by Δ (more than the length of the synchronous pre-information 14T and the rotation of the stamper disk at the length of the land track 3 corresponding to one rotation of the stamper disk. Specifically, a pulse width of (14T + Δ) is obtained by adding a length corresponding to Δ = 2 × π × (track pitch between land tracks 3).
[0038]
Next, operation | movement of the determination device 42 is demonstrated using FIG.6 (b).
[0039]
As shown in FIG. 6B, in the determination unit 42, when the EVEN frame signal S _E is within the range of the gate signal S _G , the EVEN frame signal S _E is usually at the rising timing of the EVEN frame signal S _E. In order to switch the switch 43 switched to the S _E side to the ODD frame signal S _O side, a determination signal S _J as shown in FIG. 6B is output, whereby the switch 43 ANDs the ODD frame signal S _O. Output to the circuit 44.
[0040]
Therefore, normally, when the EVEN frame signal S _E is output to the AND circuit 44, the pre-pit 4 is formed at the position of the EVEN frame based on the EVEN frame signal S _E and pre-information is recorded. However, when the EVEN frame signal S _E falls within the range of the gate signal S _{G in} the determiner 42, that is, the position of the prepit 4 before one rotation on the stamper disk (the information is contained in the gate signal S _G). ) Is close to the position of the prepit (position of the EVEN frame) in the rotation (within the range of (14T + Δ) with respect to the position of the prepit 4 before one rotation), the switch 43 is turned on. A determination signal S _J is output to switch to the ODD frame signal S _O side, and the pre-pit 4 in the rotation is formed at the position of the ODD frame. Will be made.
[0041]
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 Accordingly, a determination signal S _J for switching the switch 43 to the EVEN frame signal S _E side is output from the determination unit 42.
[0042]
Next, operations of the AND circuit 44 and the delay flip-flop circuit 47 will be described with reference to FIG.
[0043]
The AND circuit 44 calculates the logical product of the EVEN frame signal S _E or ODD frame signal S _O output from the switch 43 and the data pre-information S _PP output from the parallel / serial converter 21 to obtain a pulse width of 2T. Although outputs a logical product signal S _a with which the data pre-information S _PP, 1 bit at a time to decompose, to one sync frame corresponds to 1-bit data pre-information S _PP ( "1" ) (See FIG. 2) only for recording with a pulse width of 2T.
[0044]
The delay flip-flop circuit 47 delays the AND signal S _A by a time of 2T based on the latch data pulse S _L from the sync pattern generator 45 to generate a delayed AND circuit _SAD . Thereafter, the delayed AND circuit _SAD is output to the switch 48 as data pre-information to be recorded.
[0045]
Here, delaying the logical product signal S _A in the delay flip-flop circuit 47, the recording information apparatus described later has a synchronization signal (the length of 14T in the recording signal on the groove track 2 adjacent to prepits Although it has) is being recorded, this time, if not delay the logical product signal S _a, may rise timing of the rising timing and the pre-information of the synchronization signal in the recording signal are the same, in which case This is because it becomes difficult to separate and reproduce the pre-information and the synchronization signal. Further, the delay amount of the logical product signal S _A and the 2T is margin for preventing the effect of jitter, etc. at the time of recording of the recording signals, that rising timings of the rising timing and the pre-information of the synchronization signals are close In consideration of the above, 2T is used.
[0046]
Next, the operation of the sync pattern generator 45 will be described with reference to FIG.
[0047]
Sync pattern generator 45, when the determination signal S _J being output from the determination unit 42 is indicative of the EVEN frame signal S _E, corresponding to the EVEN frame signal S _E output from the switch 43, It generates a EVEN synchronization pre-information having the sync pattern as shown in FIG. 8 (a) and outputs to the switch 48 as the sink signal S _Y.
[0048]
On the other hand, the determination unit 42 when the determination signal S _J being output is indicative of the ODD frame signal S _O from, corresponding to the ODD frame signal S _O output from the switch 43 shown in FIG. 8 (a) It generates 0DD synchronization pre-information having the sync pattern as shown in and outputs to the switch 48 as the sink signal S _Y.
[0049]
In parallel with these operations, the sync pattern generator 45, a clock signal CLK to generate the data latch pulse S _L having a period of 2T by expanding 1T period, and outputs it to the delay flip-flop circuit 47 (FIG. 6 (See (c)).
[0050]
Finally, the operation of the sync / data switching signal generator 46 will be described with reference to FIG.
[0051]
As shown in FIG. 8B, in the sync / data switching signal generator 46, when the signal output from the switch 43 is the EVEN frame signal S _E , the 0th EVEN frame in the EVEN frame is displayed. in order to record the EVEN synchronization pre-information on the position of the frame signal S _E, (corresponding to the length of the EVEN synchronization pre-information) the 0th EVEN frame signal S timing period 14T from the rising timing of the _E "H" and it outputs the sync / data switching signal S _C to be. As a result, the switch 48 is switched to the sync signal S _Y side for a period of 14T from the rising timing of the 0th EVEN frame signal S _E , thereby generating a sync pattern at the position of the 0th EVEN frame signal S _E. The EVEN synchronization pre-information output from the device 45 is recorded.
[0052]
On the other hand, when the signal output from the switch 43 is the ODD frame signal S _O , the ODD synchronization pre-information is recorded to record the ODD synchronization pre-information at the position of the first ODD frame signal S _{O in} the ODD frame. first (corresponding to the length of the ODD synchronization pre-information) ODD frame signal S _O for a period of 14T from the rising timing "H" and outputs the sync / data switching signal S _C comprising. Thus, the switch 48 is switched by the sync signal S _Y side period 14T from the rising timing of the first ODD frame signal S _O, thereby, ODD synchronization pre-on position of the first ODD frame signal S _O Information will be recorded.
[0053]
When the characteristic features of the operation of the cutting device C of the present embodiment described above are summarized, the operations of the ODD / EVEN determination gate signal generator 41 and the determiner 45 in the cutting device C of the present embodiment are described. Thus, when the position of the pre-pit 4 before one rotation on the stamper disc (usually recorded at the EVEN frame position) is close to the position of the pre-pit 4 at the next rotation, more specifically, the pre-pit 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 to be recorded at the position of S _O is generated, the light beam by the optical modulator 25 based on this _L is modulated land track 3 comprising pre-pits 4 are formed on the DVD-R1. 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.
[0054]
As described above, according to the cutting device C of the present embodiment, the prepit 4 is formed only at a position corresponding to the EVEN frame or only at a position corresponding to the ODD frame in one rotation of the stamper disk. Compared to the case where prepits 4 are recorded for every sync frame, the number of prepits 4 in the entire DVD-R1 can be reduced, and the groove track 2 is formed for the DVD-R1 in which the prepits 4 are formed. When forming the dye film 5 (see FIG. 1) for the purpose, the dye film 5 can be a layer having a predetermined thickness necessary for design.
[0055]
To explain this effect, in general, in the formation of the prepit 4 on the land track 3, in order to quickly detect the pre-information, all the prepits 4 are formed in one place on the predetermined land track 3, Pre-information is recorded by repeatedly forming the pre-pit 4 on the land track 3 at a predetermined interval.
[0056]
By the way, when the DVD-R 1 is actually manufactured, first, the necessary prepits 4 are formed together with the groove track 2 and the land track 3, and then the material of the dye film 5 is applied to the DVD by a method such as spin coating. A recording layer having a required film thickness is formed by coating on -R1 and baking (heating) it.
[0057]
However, as described above, in the method of forming the necessary prepits 4 in one place on the land track 3, the upper surface of the prepit 4 (when the light beam irradiation direction is set upward) and the groove track are usually used. Since the upper surface of 2 is flush (see FIG. 1), the material of the dye film 5 that should originally remain on the groove track 2 flows into the prepit 4, and has a predetermined film thickness required for the design with respect to the groove track 2. The dye film 5 cannot be formed. When the dye film 5 having a predetermined thickness is not formed, the direct current (DC) component in the reproduction signal changes when reproducing the recorded information recorded by the pits formed on the dye film 5. Therefore, jitter due to the instability of the pit shape occurs, and the recorded information cannot be reproduced accurately.
[0058]
On the other hand, as described above, according to the cutting device C of the present embodiment, the number of prepits 4 can be reduced as compared with the case where the prepits 4 are recorded for every sync frame. In this sync frame, only the pre-pit 4 having a length of 2T is formed. Therefore, when the dye film 5 is formed on the DVD-R 1 on which the pre-pit 4 is formed, the dye film 5 has a predetermined thickness necessary for designing. Therefore, it is possible to prevent the occurrence of jitter due to the change of the direct current (DC) component and the instability of the pit shape as described above, and the recorded information can be reproduced accurately.
[0059]
Furthermore, according to the cutting apparatus C of the present embodiment, when the position of the prepit 4 recorded at the EVEN frame position before one rotation on the stamper disk is close to the position of the prepit 4 in the next rotation, the next rotation In this case, the pre-pit 4 is formed at the position of the ODD frame, and further, after one revolution, 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 guide track 3. In the detection of pre-information in recording of recording information described later, pre-information on adjacent guide tracks 3 can be prevented from leaking when pre-information on one guide track 3 is read, Accurate pre-information can be read.
[0060]
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 disk. 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.
[0061]
In addition, since the frame signal used when recording the pre-information on one guide track 3 is stored and the frame signal used when recording the pre-information on the adjacent guide track 3 is output, one frame can be obtained with a simple configuration. The position of the pre-pit 4 of the guide track 3 and the position of the adjacent guide track 3 can be made different.
[0062]
(II) Embodiment of information recording apparatus Next, an embodiment of an information recording apparatus which is an embodiment corresponding to the present application will be described with reference to Figs.
[0063]
First, the overall configuration of the information recording apparatus according to the embodiment will be described with reference to FIG.
[0064]
As shown in FIG. 9, the information recording apparatus R of the embodiment includes a laser diode (not shown), an objective lens described later, a deflection beam splitter, a photodetector, and the like. Detecting means for detecting pre-information by reading the pre-pit 4 for the DVD-R 1 on which the groove track 2 is formed, and emitting a light beam B as recording light for recording recording information such as image information; A pickup 70 as a recording means, a pre-pit signal detector 71 for detecting a pre-pit signal (pre-information S _P ) from a reproduction signal detected by a tangential push-pull method, which will be described later, by the pup-up 70, and detected pre-information S _P (including the synchronization pre-information and data pre-information.) waveform shaper 72 for shaping the waveform of the And a pre-pit signal detected with the reference data transfer clock output from the reference data transfer clock generator 74 to phase comparison, and PLL (Phase Locked Loop) circuit 73 for outputting the data transfer clock synchronized with the pre-information S _P The spindle motor 75 for rotating the DVD-R 1 is compared in phase with the detected pre-pit signal and the rotation speed detection signal output from the spindle motor 75, and a spindle error signal is output to the spindle motor 75. , a PLL circuit 76 for servo-controlling the rotational speed of the spindle motor 75 to a predetermined number, the pre-information S _P synchronization pre-information from the S _SY (sync pattern as the detected pre-pit signal, EVEN synchronization pre-information and shown in FIG. 2 A sync separator 77 for separating ODD synchronization pre-information) and a sync separator. A gate 78A which is opened by the output synchronization pre-information S _SY from over data 77 based on the output data transfer clock from the PLL73, the input signal S _D as a recording signal to be recorded which is input from the outside 8-16 generates recording information stream S _DS by modulating, serial and 8-16 encoder 78 of this as a generation means for output when set to the gate 78A is opened, the detected pre-information S _P / parallel conversion, if requested by the interrupt signal S _I from the CPU80 described later, the serial / parallel converter 79 outputs address information S _AD in the pre-information S _P, a recording / reproducing switching from external When the write command for recording information by a signal is input and outputs an interrupt signal S _I, in the address information S _AD obtained thereby And CPU80 outputs a brute preparation signal S _RD, 8-16 is output from the encoder 78, the pulse controller 81 with a delay amount and outputs the pulse control record information stream S _DS which is finely adjusted, pulsed control record based on the information stream S _DS, and outputs a drive signal S _DR drives the laser diode, not shown, is constituted by the LD (lASER diode) driver 82 for outputting a light beam B as the recording light.
[0065]
Next, the information recording apparatus above tangential push-pull method used for detection of pre-information S _P in R, together with the detailed structure of the pickup 70 and the pre-pit signal detector 71 will be described with reference to FIGS.
[0066]
The tangential push-pull method refers to the push-pull method in the rotation direction of the DVD-R1, and the reflected light from the light spot SP by the light beam B formed on the land track 3 of the DVD-R1 is converted into the prepit 4 Of reproducing the pre-information based on a difference signal of the partial detector in a photodetector divided into two partial detectors by a dividing line optically perpendicular to the moving direction of the disc (the rotating direction of the disk) It is.
[0067]
More specifically, as shown in FIG. 10, the light beam B as recording light (which becomes reproduction light for the prepit 4) generated by a laser diode (not shown) or the like is a polarization beam splitter. 91 and reflected by the objective lens 90 on the groove track 2 and the land track 3 of the DVD-R 1 (see FIG. 1). Then, the reflected light of the light beam B, which is modulated by the pre-pit 4 and whose polarization plane is rotated by reflection by the DVD-R1, passes through the polarization beam splitter 91 due to the rotation of the polarization plane, and in the rotation direction of the DVD-R1. Each light receiving surface of the photodetector 92 divided into two partial detectors 92A and 92B is irradiated and detected by an optically vertical dividing line. The light receiving outputs of the partial detectors 92A and 92B (in the following description, the outputs of the partial detectors are indicated by symbols A and B) are subtracted by a subtractor 93 that constitutes the prepit signal detector 71, and the difference between them is subtracted. The signal (A-B) is output to the waveform shaper 72 as a reproduction signal (pre-pit information S _P ).
[0068]
Next, generation of a difference signal (tangential push-pull signal) (AB) by the photodetector 92 and the subtractor 93 will be described with reference to FIG.
[0069]
In FIG. 11, when the reflected light from the pre-pit 4 having the shape shown in the sectional view of the rotation direction of the DVD-R 1 in FIG. 11 (a) is received by the photodetector 92, the received light output of the partial detectors 92A and 92B is Based on the positional deviation, as shown in FIG. 11B, the phase detectors output RF (Radio Frequency) signals (A and B) from the respective partial detectors 92A and 92B. Then, the difference signal (tangential push-pull signal) (AB) shown in FIG. 11B is generated by taking the difference between the respective RF signals by the subtractor 93.
[0070]
Next, the operation of the information recording apparatus R for recording the recording information based on the pre-information S _P detected by the above-mentioned tangential push-pull method will be described with reference a flowchart shown in FIG. 12.
[0071]
First, the operation of the CPU 80 will be mainly described with reference to FIG.
[0072]
As shown in FIG. 12 (a), the CPU 80 first determines whether or not a recording information write command has been input from the outside (step S1). If no write command is input (step S1; NO) ) as it waits, if the write command is input (step S1; YES), then, in order to obtain the address information S _AD corresponding to the recording information to be recorded, a serial / parallel interrupt signals S _I The data is output to the converter 79 (step S2). In parallel with the processing of steps S1 and S2, the DVD-R1 is rotated by the spindle motor 75, and the pre-pits formed on the land track 3 of the DVD-R1 by irradiating the light beam B corresponding thereto. acquisition of pre-information S _P is being carried out from 4.
[0073]
When the interrupt signal S _I is output in step S2, the interrupt signal S _I in response to input from the serial / parallel converter 79 the address information S _AD is predetermined address information corresponding to the recording information to be recorded it is determined whether the S _AD (step S3), and if not the predetermined address information S _AD (step S3; nO), outputs the interrupt signal S _I to get again other address information S _AD As soon as possible, the process returns to step S2.
[0074]
On the other hand, if the obtained address information S _AD is the predetermined address information S _AD (step S3; YES), by which the predetermined address information S _AD is acquired for 8-16 encoder 78 in order to prepare the output of the record information stream S _DS outputs a ready signal S _RD (step S4), and ends the process.
[0075]
Next, the operation in the 8-16 encoder 78 to which the preparation signal S _RD is input will be described with reference to FIG.
[0076]
As shown in FIG. 12 (b), in the 8-16 encoder 78, first, whether the preparation signal S _RD from CPU80 are inputted is judged (step S10), and if not inputted (step S10; NO) waiting to be input, when the preparation signal S _RD is inputted (step S10; YES), whether the synchronization pre-information S _SY in the detected pre-information S _P from the sync separator 77 is input It is determined whether or not the head of the recording sector has been detected (step S11). If not detected (step S11; NO), the process waits until the next preparation signal _SRD is input in step S10. return, if the synchronization pre-information S _SY is detected (step S11; YES), ECC block period Tsugini (26 recording Kuta period) counted (step S12), the in the case where the timing is not finished (step S12; wait until the end of NO), if completed (step S12; YES), the input signal S _D 8 The output of the recording information stream S _DS is started by performing −16 modulation and opening the gate 78A (step S14). Note that the recording information stream _SDS is output based on the data transfer clock from the PLL circuit 73. In the record information stream S _DS, the synchronization signal (the position pre-pit 4 is formed in the pre-information) (length 14T) is added beginning of each for each one sync frame. Here, the reason for counting the ECC block period in steps S12 and S13 is to reliably record the recording information from the head of the ECC block.
[0077]
8-16 after being outputted record information stream S _DS from the encoder 78, the record information stream S _DS is pulsed controlled by pulse controller 81, the driving signal corresponding to the record information stream S _DS by the LD driver 82 S _DR is outputted, this by the drive signal S _DR is a laser diode (not shown) in the pickup 70 is driven light beam B emitted, the recording information pits corresponding to the recording information stream S _DS is formed on the groove track 2 Recording information is recorded. When the input signal _SD is modulated by the 8-16 modulation method, the length of the recording information pit formed on the DVD-R1 is between 3T and 14T.
[0078]
Here, by the operation in the 8-16 encoder 78 (see FIG. 12B), the synchronization pre-information in the pre-pit 4 and the synchronization signal in the recording information coincide. Therefore, within one recording sector, the data pre-information after the synchronization pre-information (recorded at the head of one sync frame at a length of 2T as described above) and the sync signal in the recording information are synchronized. Will be. That is, when recording information pits P _D corresponding to this recorded information look at DVD-R1 recorded on the groove track 2, as shown in FIG. 13, corresponding to the invention described in claim 16 , so that the sync signal pit P _S in always recorded information next to the pre-pit 4 is formed. In FIG. 13, the light spot SP (see FIG. 1) is formed on the groove track 2 with respect to the rotation direction of the DVD-R1, and adjacent to the outer peripheral side (right side in the rotation direction) of the groove track 2. The case where the prepit 4 to be read is read is shown. Further, the length of the rotational direction of the respective pre-pit 4 is 2T, which is the be different from any of the length of the recording information pits P _D formed by 8-16 modulation.
[0079]
As described above, according to the information recording apparatus R of the embodiment, the recording information is recorded with the synchronization signal added for each sync frame, and the synchronization signal and the pre-information are recorded in synchronization. On the DVD-R 1 on which both pre-information and recorded information are recorded, the position of the synchronization signal on the groove track 2 and the position of the pre-pit 4 on the land track 3 are adjacent to each other, so that detection of the pre-information is performed. Alternatively, in reproducing recorded information, it is possible to easily separate and reproduce recorded information and pre-information, and it is possible to accurately detect pre-information or reproduce recorded information.
[0080]
Furthermore, since the rotational direction of the length of the pre-pit 4 corresponding to pre-information (2T) is a length different from any of the length of the recording information pits P _D corresponding to the recording information (3T to 14T), the record information In reproduction, it is possible to reliably reproduce the pre-information separately, and it is possible to reproduce the recorded information accurately.
[0081]
Furthermore, the first 2T period in each pre-information (synchronous pre-information or data pre-information) recorded at the head of the sync frame is set to “L” by the operation of the delay flip-flop circuit 47 (see FIG. 2). ) Even if the position of the pre-pit 4 corresponding to the pre-information and the position of the synchronization signal in the recording signal are adjacent, both can be detected without crosstalk.
[Brief description of the drawings]
FIG. 1 is an external view showing an example of a DVD-R in which prepits are formed on a land track.
FIG. 2 is a diagram showing a recording format of pre-information or recording information.
FIG. 3 is a block diagram illustrating a schematic configuration of the cutting apparatus according to the embodiment.
FIG. 4 is a block diagram illustrating a schematic configuration of a preformat encoder according to the embodiment.
FIG. 5 is a block diagram illustrating a schematic configuration of a frame signal generator and an ODD / EVEN determination gate signal generator according to the embodiment;
FIG. 6 is a timing chart (I) showing the operation of the preformat encoder, (a) is a timing chart showing the EVEN frame signal and the ODD frame signal, and (b) is a timing chart showing the operation of the determiner. (C) is a timing chart showing the operation of the AND circuit and the delay flip-flop circuit.
FIG. 7 is a timing chart showing operations of a frame signal generator and an ODD / EVEN determination gate signal generator.
FIG. 8 is a timing chart (II) showing the operation of the preformat encoder, (a) is a timing chart showing the operation of the sync pattern generator, and (b) is an operation of the sync data switching signal generator. It is a timing chart which shows.
FIG. 9 is a block diagram showing a schematic configuration of the information recording apparatus of the embodiment.
FIG. 10 is a block diagram illustrating a schematic configuration of a pickup and a prepit signal detector according to the embodiment.
11A and 11B are diagrams for explaining generation of a tangential push-pull signal, FIG. 11A is a cross-sectional view showing a pre-pit shape, and FIG. 11B is a graph showing waveforms of an RF signal and a tangential push-pull signal. is there.
FIG. 12 is a flowchart showing the operation of the information recording apparatus, (a) is a flowchart showing the operation of the CPU, and (b) is a flowchart showing the operation of the 8-16 encoder.
FIG. 13 is a plan view of a recording surface of a DVD-R on which recording information is recorded.
[Explanation of symbols]
1 ... DVD-R
2 ... groove track 3 ... land track 4 ... pre-pit 5 ... dye film 6 ... gold vapor 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 ... optical modulator 26, 90 ... objective lens 27 ... glass substrate 28 ... resist 29, 75 ... 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 ... Determinators 43, 48 ... Switch 44 ... AND circuit 45 ... Sync pattern generator 46 ... Sync data switching signal Generator 47 ... delay flip-flop circuit 50 ... ODD frame counter 51 ... EVEN frame Counter 52, 53 ... decoder 60 ... latch circuit 61 ... gate counter 62 ... mono multivibrator 70 ... pickup 71 ... pre-pit signal detector 72 ... waveform shapers 73, 76 ... PLL circuit 74 ... reference data transfer clock generation 77 ... Sync separator 78 ... 8-16 encoder 78A ... Gate 79 ... Serial / parallel converter 80 ... CPU
81 ... Pulse controller 82 ... LD driver 91 ... Polarizing beam splitter 92 ... Photo detectors 92A, 92B ... Partial detector 93 ... Subtractor C ... Cutting device CLK ... Clock signal R ... Information recording device L _L , L _G , B ... light beam SP ... light spot S _P ... pre-information S _PP ... data pre-information S _R ... recording pre-information S _S ... one rotation 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 ... judgment signal S _L ... data latch pulse S _Y ... sync signal S _C ... sync / data switching signal S _G ... gate signal S _GC ... gate count signal S _A ... logical product signal S _AD ... Delayed AND signal S _DR ... Drive signal S _I ... Interrupt signal S _AD ... Address information S _RD ... Preparation signal S _SY ... Synchronization pre-information S _D ... Input signal S _DS ... Recording information data stream P _D ... Recording information pit P _S ... Synchronization signal pit

Claims (12)

An information recording method for recording recorded information on an information recording medium,
The information recording medium is
An information recording track for recording the recording information;
Pits corresponding to pre-information having an interval corresponding to the length of a pre-information unit obtained by multiplying the length of the information unit in the recording information by a predetermined integer number of 2 or more and including address information indicating a position on the information recording medium A guide track on which prepits that are rows are formed;
With
The information recording method includes:
A detection step of detecting the pre-information from the information recording medium;
A generation step of generating the recording information to which a synchronization signal is added for each information unit corresponding to the detected pre-information,
The generated recording information is recorded on the information recording track so that at least the head pre-information in the length of the information unit and the synchronization signal overlap with each other in a direction perpendicular to the guide track. Recording process;
An information recording method comprising: The information recording method according to claim 1,
  One information unit is one sync frame,
  The pre-information is recorded for each pre-information unit obtained by doubling the one sync frame.
  An information recording method, further comprising a determination step of determining an address where the recording information is to be recorded based on the pre-information. The information recording method according to claim 1 or 2,
  The pre-information includes synchronous pre-information and data pre-information,
  The information recording method, wherein the synchronization pre-information corresponds to the head of a sector composed of a plurality of information units. In the information recording method of Claim 3,
  In the recording step, the recording information is set so that both the head of the synchronization pre-information located at the head of the sector and the synchronization signal in the recording information are located on a straight line perpendicular to the guide track. A method for recording information. In the information recording method as described in any one of Claims 1 thru | or 4,
  The information recording method according to claim 1, wherein the pre-information is detected by using a light beam irradiated so that the center of the information recording track coincides with the center. In the information recording method as described in any one of Claims 1 thru | or 5,
  The information recording medium is a stamper disk;
  An information recording method, further comprising the step of manufacturing a disc on which information can be written using the stamper disc. An information recording apparatus for recording recorded information on an information recording medium,
  The information recording medium is
An information recording track for recording the recording information;
A pit corresponding to pre-information having an interval corresponding to the length of a pre-information unit obtained by multiplying the length of the information unit in the recording information by a predetermined integer number of 2 or more and including address information indicating a position on the information recording medium A guide track on which prepits that are rows are formed;
With
  The information recording device includes:
  Detecting means for detecting the pre-information from the information recording medium;
  Generating means for generating the recording information to which a synchronization signal is added for each information unit corresponding to the detected pre-information;
  The generated recording information is recorded on the information recording track so that at least the head pre-information in the length of the information unit and the synchronization signal overlap with each other in a direction perpendicular to the guide track. Recording means;
  An information recording apparatus comprising: The information recording apparatus according to claim 7,
  One information unit is one sync frame,
  The pre-information is recorded for each pre-information unit obtained by doubling the one sync frame.
  An information recording apparatus, further comprising: a determination unit that determines an address where the recording information is to be recorded based on the pre-information. In the information recording device according to claim 7 or 8,
  The pre-information includes synchronous pre-information and data pre-information,
  The information recording apparatus, wherein the synchronization pre-information corresponds to the head of a sector composed of a plurality of information units. The information recording apparatus according to claim 9,
  The recording means records the recording information so that both the head of the synchronization pre-information located at the head of the sector and the synchronization signal in the recording information are located on a straight line in a direction perpendicular to the guide track. An information recording apparatus for recording. In the information recording device according to any one of claims 7 to 10,
  The information recording apparatus according to claim 1, wherein the pre-information is detected by using a light beam irradiated so that a center of the information recording track coincides with the center. In the information recording device according to any one of claims 7 to 11,
  The information recording medium is a stamper disk;
  An information recording apparatus further comprising means for manufacturing a disk on which information can be written using the stamper disk.

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