CN100444250C

CN100444250C - Method and apparatus for inspecting optical disc

Info

Publication number: CN100444250C
Application number: CNB2006101543829A
Authority: CN
Inventors: 常盤和典
Original assignee: Victor Company of Japan Ltd
Current assignee: JVCKenwood Corp
Priority date: 2005-12-06
Filing date: 2006-09-25
Publication date: 2008-12-17
Anticipated expiration: 2026-09-25
Also published as: CN1979650A

Abstract

Reflected light caused by reflection of a laser beam at a first layer of an optical disc is converted into a main signal. Reflected light caused by reflection of the laser beam at a second layer of the optical disc is converted into a sub signal. An address of a currently-accessed position in the first layer is detected from the main signal. A reference address in the first layer corresponds to a boundary between a signal recorded area and a signal unrecorded area in the second layer. A specified address in the first layer corresponds to a position radially separated from the position at the reference address by an allowable range. A misalignment between tracks on the first and second layers is concluded to be within the allowable range in cases where the sub signal substantially takes a reference level when the detected address reaches the specified address.

Description

Optical disk check device and optical disk check method

Technical field

The present invention relates to optical disk check device and inspection method, particularly have in the CD-R of several record layers, check device and the method for corresponding orbital position in the predictive error scope between adjacent recording layer.

Background technology

As optical disk check device or inspection method, there is this existing mode of DVD-R dish dual layer discs inspection method.As in the conventional example first, utilize microscopical method.In two-layer the 0th layer and ground floor carry out the record of planned orbit width, measure the posting field at the 0th layer at three places and the frontier point of posting field not by two dimension, can measure the 0th layer orbit centre position and diameter.Equally, measure the posting field of three place's ground floors and the frontier point of posting field not, can measure the orbit centre position and the diameter of ground floor by two dimension.Specifically, draw two straight lines between 2 in 3 o'clock, draw vertical line to the orbit centre direction from its mid point.Point of crossing with two vertical lines is defined as the center separately.Centre deviation amount (Rd) (with reference to Fig. 4) when the distance of the orbit centre point of the 0th layer and ground floor becomes the CD rotation.

As the requirement of error range in the CD manufacturing, maximum relative error value Dmax and minimum relative error value Dmin have been stipulated.Specifically, the 0th layer start address be (=FFCFFFh) time, the orbital position of corresponding ground floor is address (=003000h) radial location+0.258mm (Ax value), but the error that is allowed in the manufacture process is, relatively should+0.258mm (Ax value), from+0.168mm extremely+0.348mm till (with reference to Fig. 8).

Try to achieve above-mentioned centre deviation amount (Rd), then maximum relative error value Dmax and minimum relative error value Dmin can try to achieve from following formula.

Maximum relative error value Dmax=(D _L0-D _L1)/2+Rd

Minimum relative error value Dmin=(D _L0-D _L1)/2-Rd

(D _L0: the 0th layer of race way diameter, D _L1: the ground floor race way diameter)

To the ECC block address of as shown in Figure 8 the 0th layer of track, above-mentioned maximum relative error value and minimum relative error value must satisfy the ground floor orbital position--the error of oblique line part.In addition, with the 0th layer start address (=FFCFFFh) address of corresponding ground floor orbital position (=003000h) can convert by the step-by-step negate and obtain, with the 0th layer start address (=FFCFFFh) position of the ground floor track of same radius, only need with above-mentioned address (=003000h) move above-mentioned Ax value and obtain (the Ax value of correspondence the 0th layer address please refer to Fig. 8) to periphery.

Secondly, as in the conventional example second has from the optical disk data reproducing signal with the electrical method method for measuring.Mensuration is recorded in HF signal asymmetric of DVD-R dual layer discs, by the address location of the change-detection CD of this asymmetry value.Specifically, write down the 0th layer on planned orbit width in advance, at the enterprising line item of ground floor so that cover the radius region of this track width.At this moment, because ground floor record is to carry out record by the laser beam of the recording layer by the 0th layer, so changes since the 0th layer the not posting field and the border Writing power of posting field, it is asymmetric poor to show as on ground floor HF signal.Utilize this phenomenon, if the 0th layer the start address that will write down in advance and end address are definite, ground floor playback time then, the ground of asymmetry value variation can detect as the 0th layer start-of-record address or end of record (EOR) address location.Address detected can be carried out by demodulation HF signal in the address of posting field.

According to Fig. 7 the chief component of this conventional example is described.The recorded information of the CD of resetting from optical picking-up head 700 is accepted by main PD (photodetector) 706 as main beam 701, converts voltage to by I/V amplifier 702, obtains as HF signal 707.The HF signal of resetting 707 is imported into the address demodulating unit 703 that detects the address, and, be imported into the asymmetric detecting unit 704 of the asymmetrical state that detects the HF signal.Detected asymmetric signal, because the central point deviation of same all tracks of the 0th layer of causing by CD rotation and ground floor, at the boundary vicinity of above-mentioned the 0th layer and ground floor posting field, the variation of generation asymmetry value and rotate the synchronous phenomenon that changes.Asymmetric detecting unit 704 is always worked in this change, to detect the minimum value of asymmetry value.In fact, during the posting field of playback ground floor, the 0th layer of the same radius position adjacent with this ground floor is under the situation of posting field, and it is big that asymmetry value becomes, and on the contrary, the 0th layer is that asymmetry value diminishes under the situation of not posting field.

Inspection unit 705 is obtained the permissible error scope corresponding with the orbital position of ground floor same radius from above-mentioned start-of-record address or the end of record (EOR) address that is recorded in the 0th layer in advance.And, from the address that above-mentioned address demodulating unit 703 is read ground floor, when the address value of this ground floor is the limits of error address of the same radius orbital position correspondence of above-mentioned ground floor, and when the signal level that is obtained by asymmetric detecting unit is identical with the asymmetric predetermined level that obtains from the 0th layer posting field, think that the structure of CD is in specification limit.

[patent documentation 1] spy opens flat 11-203692 communique

Summary of the invention

The present inventor utilizes the DVD-RW double-layer CD that has the erasable type CD of a plurality of recording layers as this, has attempted checking with the means that the electrical method that is used in existing DVD-R dual layer discs is measured.But, under the situation of DVD-RW double-layer CD, almost can not detecting the variation of asymmetry value, it is very difficult that the electrical method method for measuring becomes.

The objective of the invention is to, address the above problem a little, the recordable CD with several record layers is provided testing fixture, the inspection method that to utilize electrical method to measure well.

In order to solve above-mentioned problem, the invention provides with lower device and method.

(1) a kind of optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: optical picking-up head, this optical picking-up head has for the signal of playback of recorded in the recording layer of above-mentioned CD, main beam is focused on the recording layer of playback object and shine, be used to accept first photoelectric conversion unit of the above-mentioned main beam of returning from above-mentioned CD reflection and be arranged at second photoelectric conversion unit around this first photoelectric conversion unit; Detecting signal unit, for a recording layer in the above-mentioned several record layers is made as first recording layer, on second recording layer adjacent with this first recording layer, with the presumptive address on the track is that the border is provided with posting field and not the inspection object CD of posting field, when resetting above-mentioned first recording layer by above-mentioned optical picking-up head, above-mentioned detecting signal unit detects the signal level that is subjected to light signal, and the above-mentioned light signal that is subjected to is to receive the light signal that is subjected to that above-mentioned main beam by above-mentioned second recording layer reflection obtains by above-mentioned second photoelectric conversion unit; The address demodulating unit at above-mentioned playback time, from receive being subjected to the light signal that above-mentioned main beam by the reflection of above-mentioned first recording layer obtains by above-mentioned first photoelectric conversion unit, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection unit, obtain determining by the above-mentioned presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with above-mentioned presumptive address same radius position is a base address, obtain from this base address along radial direction the address of position on above-mentioned first recording layer of only moving predetermined limits of error amount, be limits of error addresses, at above-mentioned playback time, when reading above-mentioned limits of error address by above-mentioned address demodulating unit, be under the situation of the above-mentioned detection level that obtains when posting field reflects above-mentioned main beam in by above-mentioned second recording layer only at the detection level that obtains by above-mentioned detecting signal unit, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

(2) a kind of optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: optical picking-up head, this optical picking-up head has for the signal of playback of recorded in the recording layer of above-mentioned CD, main beam is focused on the recording layer of playback object and shine, be used to accept first photoelectric conversion unit of the above-mentioned main beam of returning from above-mentioned CD reflection and be arranged at second photoelectric conversion unit around this first photoelectric conversion unit; Detecting signal unit, for a recording layer in the above-mentioned several record layers is made as first recording layer, on second recording layer adjacent with this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, when resetting above-mentioned first recording layer by above-mentioned optical picking-up head, detecting signal unit detects the signal level be subjected to light signal, and the above-mentioned light signal that is subjected to is to receive the light signal that is subjected to that above-mentioned main beam by above-mentioned second recording layer reflection obtains by above-mentioned second photoelectric conversion unit; The address demodulating unit at above-mentioned playback time, from receive being subjected to the light signal that above-mentioned main beam by the reflection of above-mentioned first recording layer obtains by above-mentioned first photoelectric conversion unit, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection unit, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, and, obtain equally by the second definite base address of above-mentioned second presumptive address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, and above-mentioned one side of obtaining from above-mentioned second base address along radial direction of posting field only moves the address of the position of above-mentioned limits of error amount at above-mentioned first recording layer, i.e. second limits of error address, at above-mentioned playback time, when reading above-mentioned first limits of error address and second limits of error address respectively by above-mentioned address demodulating unit, no matter when, only under the situation of the detection level that obtains by the above-mentioned detecting signal unit detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

(3) a kind of optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: optical picking-up head, this optical picking-up head has for the signal of playback of recorded in the recording layer of above-mentioned CD, main beam is focused on the recording layer of playback object and shine, be used to accept first photoelectric conversion unit of the above-mentioned main beam of returning from above-mentioned CD reflection and be arranged at second photoelectric conversion unit around this first photoelectric conversion unit; Detecting signal unit, for a recording layer in the above-mentioned several record layers is made as first recording layer, on second recording layer adjacent with this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, when resetting above-mentioned first recording layer by above-mentioned optical picking-up head, detecting signal unit detects the signal level be subjected to light signal, and the above-mentioned light signal that is subjected to is to receive the light signal that is subjected to that above-mentioned main beam by above-mentioned second recording layer reflection obtains by above-mentioned second photoelectric conversion unit; The address demodulating unit at above-mentioned playback time, from receive being subjected to the light signal that above-mentioned main beam by the reflection of above-mentioned first recording layer obtains by above-mentioned first photoelectric conversion unit, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection unit, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, at above-mentioned playback time, when reading above-mentioned first limits of error address by above-mentioned address demodulating unit, only under the situation of the detection level that obtains by the above-mentioned detecting signal unit detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

(4) a kind of optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: optical picking-up head, this optical picking-up head has for the signal of playback of recorded in the recording layer of above-mentioned CD, main beam is focused on the recording layer of playback object and shine, be used to receive first photoelectric conversion unit of the above-mentioned main beam of returning from above-mentioned CD reflection and be arranged at second photoelectric conversion unit around this first photoelectric conversion unit; Detecting signal unit, for a recording layer in the above-mentioned several record layers is made as first recording layer, on second recording layer adjacent with this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, when resetting above-mentioned first recording layer by above-mentioned optical picking-up head, detecting signal unit detects the signal level be subjected to light signal, and the above-mentioned light signal that is subjected to is to receive the light signal that is subjected to that above-mentioned main beam by above-mentioned second recording layer reflection obtains by above-mentioned second photoelectric conversion unit; The address demodulating unit at above-mentioned playback time, from receive being subjected to the light signal that above-mentioned main beam by the reflection of above-mentioned first recording layer obtains by above-mentioned first photoelectric conversion unit, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection unit, obtain determining by above-mentioned second presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned second presumptive address same radius position i.e. second base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned second base address along radial direction only moves predetermined limits of error amount, i.e. second limits of error address, at above-mentioned playback time, when reading above-mentioned second limits of error address by above-mentioned address demodulating unit, only under the situation of the detection level that obtains by the above-mentioned detecting signal unit detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

(5) a kind of optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: playback step, for a recording layer in the above-mentioned several record layers is made as first recording layer, on the second adjacent recording layer of this first recording layer, with the presumptive address on the track is that the border is provided with posting field and not the inspection object CD of posting field, for the signal of playback of recorded on above-mentioned first recording layer, main beam is focused on above-mentioned first recording layer and shine, obtain reflected light; Signal detection step detects and to receive the signal level that is subjected to light signal that the above-mentioned main beam by above-mentioned second recording layer reflection obtains through opto-electronic conversion again; The address demodulation step from receiving above-mentioned main beam by the reflection of above-mentioned first recording layer again through being subjected to the light signal that opto-electronic conversion obtains, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection step, obtain determining by the above-mentioned presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with above-mentioned presumptive address same radius position is a base address, obtain from this base address along radial direction the address of position above-mentioned first recording layer of only moving predetermined limits of error amount, be limits of error addresses, when reading above-mentioned limits of error address by above-mentioned address demodulation step, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

(6) a kind of optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: playback step, for a recording layer in the above-mentioned several record layers is made as first recording layer, on the second adjacent recording layer of this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, for the signal of playback of recorded on above-mentioned first recording layer, main beam is focused on above-mentioned first recording layer and shine, obtain reflected light; Signal detection step detects and to receive the signal level that is subjected to light signal that the above-mentioned main beam by above-mentioned second recording layer reflection obtains through opto-electronic conversion again; The address demodulation step from receiving above-mentioned main beam by the reflection of above-mentioned first recording layer again through being subjected to the light signal that opto-electronic conversion obtains, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection step, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, when reading above-mentioned first limits of error address by above-mentioned address demodulation step, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

(7) a kind of optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that, have: playback step, for a recording layer in the above-mentioned several record layers is made as first recording layer, on the second adjacent recording layer of this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, for the signal of playback of recorded on above-mentioned first recording layer, main beam is focused on above-mentioned first recording layer and shine, obtain reflected light; Signal detection step detects and to receive the signal level that is subjected to light signal that the above-mentioned main beam by above-mentioned second recording layer reflection obtains through opto-electronic conversion again; The address demodulation step from receiving above-mentioned main beam by the reflection of above-mentioned first recording layer again through being subjected to the light signal that opto-electronic conversion obtains, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And inspection step, obtain determining by above-mentioned second presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned second presumptive address same radius position i.e. second base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned second base address along radial direction only moves predetermined limits of error amount, i.e. second limits of error address, when reading above-mentioned second limits of error address by above-mentioned address demodulation step, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

According to the present invention, for the recordable CD with several record layers, for example DVD-RW double-layer CD, DVD-R double-layer CD can check, confirm whether to constitute by specification requirement in the error in address of the track of the 0th layer and ground floor same radius position.

And, be located at interior week, week, periphery etc. by being used for checking the track record zone of mensuration, the error in address of corresponding track between the recording layer that arbitrarily radial location is adjacent can be checked, and the effect that whole Zhang Guangpan is whether up to specification can be accurately checked in addition.

And, in detecting signal unit (signal detection step), as the detected signal level that is subjected to light signal, under the situation that detects this peak value that is subjected to light signal, the tilting section of the curve of the detection level that detecting signal unit (signal detection step) obtains becomes precipitous, judge that at inspection unit (inspection step) detecting level becomes easier, judges whether the site error of corresponding track can more easily carry out in preset range.

On the other hand, in detecting signal unit (signal detection step), as the detected signal level that is subjected to light signal, under the situation that detects this mean value that is subjected to light signal, can realize detecting the detection level that obtains for detecting signal unit (signal detection step), alleviated the above-mentioned noise effect that is subjected to light signal, more stable level, in inspection unit (inspection step), whether the site error of corresponding track judgement in preset range, can more stably carry out.

Description of drawings

Fig. 1 is the block diagram that is used to illustrate the optical disk check device of principle of work of the present invention.

Fig. 2 is the synoptic diagram of the position relation of laser beam and track ditch.

Fig. 3 is the synoptic diagram that is used to illustrate the testing example of principle of work of the present invention.

Fig. 4 is the figure that is used for illustrating in embodiment 1 maximum relative error and minimum relative error.

Fig. 5 is used for illustrating the figure that works at embodiment 1.

Fig. 6 is the figure that is used for illustrating in embodiment 2 testings.

Fig. 7 is the block diagram of existing optical disk check device.

Fig. 8 is the synoptic diagram of the permissible error of orbital position between adjacent recording layer.

Fig. 9 is the figure of explanation judgement of inspection in embodiment 1.

Figure 10 is the synoptic diagram of testing flow process in embodiment 1.

Embodiment

The principle of work of optical disk check device of the present invention is described according to Fig. 1 to Fig. 3.

Fig. 1 is that expression has been suitable in the optical disk check device of the CD-R with a plurality of recording layers of the present invention, has related to the frame diagram of the present invention's part.

By describing as DVD-RW dual layer discs with erasable type CD of a plurality of recording layers.The recording layer structure of this CD shown in Fig. 3 (a), if from the state of the information of optical picking-up head one side playback record layer, then is called the 0th recording layer with the near recording layer of optical picking-up head, and the recording layer in distally is called first recording layer.

Optical picking-up head irradiates a main beam and two auxiliary bundle, in the example of Fig. 2, on the groove 203 of the track ditch of the 0th layer that has write down recording layer (zero layer posting field 301), focus on main beam 200, auxiliary 1 bundle 201 of irradiation and auxiliary 2 bundles 202 respectively on the base station 204 of adjacent orbit ditch.

The recording layer that is in Fig. 1 in the playback procedure is made as ground floor, accepted by main PD 106 by the main beam of the recording layer of ground floor reflection, auxiliary 1 bundle by auxiliary 1PD 104 accept, auxiliary 2 bundles are accepted by auxiliary 2PD 105.

The 0th layer flare 109 is represented to shine in the state of all photodetectors (main PD 106, auxiliary 1PD 104, auxiliary 2PD 105) after main beams are by the 0th layer recording layer reflection in Fig. 1.With Fig. 3 is that example describes this state.

Optical picking-up head 100 has laser diode (LD) 305 in Fig. 3 (a), make laser become the standard value lens (CL) 306 of directional light, to be worth light beam that lens 306 come out from standard and be divided into a main beam and two auxiliary bundle grating 307 of totally 3 bundles, to guide the polarised light splitter 308 of object lens (OL) 310 from the light beam that grating 307 comes out into, to become 1/4 λ plate 309 of circularly polarized light from the linearly polarized light that polarised light splitter 308 comes out, and will focus on object lens 310 on the CD from the light beam that 1/4 λ plate 309 comes out.

Optical picking-up head 100 also has: make by CD reflection and the light beam by object lens 310,1/4 λ plate 309, polarised light splitter 308 and focus on detection lens 311 on the photodetector (PD); Accept to have focused on the main PD 106 of main beam 103 irradiations; Accept the auxiliary 1PD 104 of auxiliary 1 bundle 101 irradiations; Accept the auxiliary 2PD 105 of auxiliary 2 bundles 102 irradiations.

The optical picking-up head of Fig. 3 (a) expression is an example, and under the situation of simplifying the optical picking-up head structure, even omit grating 307,1/4 λ plate 309, polarised light splitter 308 constitutes also as optical splitter can realize same action.

Because optical picking-up head 100 is recording layers 303 of playback ground floor, so main beam is by the 0th layer recording layer 301.At this moment, between the recording layer of the 0th layer and ground floor, there is wall (not shown), because of it is extremely thin layer, so though main beam 200 not the 0th layer recording layer 301 focusing, but is in very approaching state.Therefore, though very weak from the 0th layer of reflected light that comes out, the light path of passing through optical picking-up head 100 is with around the 0th layer of flare (109) the back light electric explorer (PD).

Common this hot spot light is compared very little with each light beam that main beam is reflected by ground floor, therefore almost not influence.But, pick up under the first-class situation in recording light, the situation as 1/15 that the light quantity of auxiliary bundle is designed to be reduced to main beam is more, the light quantity of the auxiliary bundle that auxiliary relatively 1PD 104, auxiliary 2PD 105 are accepted, the light quantity ratio of the 0th layer of flare 109 that auxiliary 1PD 104, auxiliary 2PD 105 are accepted becomes big, and the 0th layer of signal that flare 109 causes reaches the level that can be used as being subjected to light summation signals (SBAD signal 110) of auxiliary bundle signal and be detected.The present invention utilizes this signal to check.

In addition, accept though this hot spot light also is used to the main PD 106 of main beam, the light income of main beam is compared very big with the light income of hot spot, therefore can not be affected at aspects such as focus detection.And, when detecting differential push-pull signal (DPP) with tracking, though perform calculations according to the light quantity of main beam and auxiliary bundle, because the photodetector of main beam and auxiliary bundle receives roughly the same hot spot light, therefore fallen by payment in above-mentioned DPP calculation, it influences disappearance.

At above-mentioned example, represented to comprise the optical picking-up head 100 of the three beam-type of auxiliary bundle among Fig. 1, but for implementing the present invention, it also is feasible that the luminous a branch of type optical picking-up head of main beam is only arranged.And this moment, if accept the PD element of the 0th layer of flare 109 be arranged at main PD 106 around, then can detect hot spot.

Shown in Fig. 3 (b), the 0th layer of flare 109 and accept the position relation of the PD element (PD that is used for auxiliary bundle) of this 0th layer of flare 109 is preferably the largest interval (the maximum length d2 of photodetector components) of assisting 1PD 104 and auxiliary 2PD 105 and is arranged to diameter d 1 (d1＞d2) less than above-mentioned the 0th layer of flare 109.And,,, then do not do particular provisions and can detect hot spot light yet if in the diameter d 1 of above-mentioned the 0th layer of flare 109 as for the direction that is provided with of auxiliary 1PD 104 and auxiliary 2PD 105.

SBAD signal 110 as shown in Figure 1 be two auxiliary 1PD 104 that are used for auxiliary bundle, auxiliary 2PD 105 accept signal be subjected to the light summation signals, also be the signal that is converted to voltage by an auxiliary side I/V amplifier 107.This SBAD signal 110 is imported into detecting signal unit 111.

In addition, this SBAD signal 110 used two auxiliary 1PD 104 that are used for auxiliary bundle, auxiliary 2PD 105 accept signal be subjected to the light summation signals, but use an auxiliary PD signal that is used for auxiliary bundle also to be fine.

SBAD signal 110, when causing the orbit centre point deviation in the 0th layer and same week of ground floor by CD rotation, in the above-mentioned ground floor track playback procedure, in the posting field (posting field) of the 0th layer of track and the not output and the synchronous phenomenon that changes of rotation of the boundary vicinity generation SBAD signal 110 of posting field.Detecting signal unit 111 carries out work, with crest voltage or the mean value that detects this SBAD signal.

In fact shown in Fig. 3 (a), the playback ground floor is not during posting field 303, in same radius position on the 0th layer adjacent with this ground floor is under the situation of the 0th layer of posting field (posting field) 301, the output of detecting signal unit 111 is reduced to voltage V1H, on the contrary, be the 0th layer not under the situation of posting field 302, the output of detecting signal unit 111 increases and is voltage V2H (317).

At the posting field of the 0th layer of track and the boundary vicinity of posting field not, because the influence of main beam beam diameter, the SBAD signal is got current potential between it.

In addition, the situation when 316 expressions of the tilting section 315 of Fig. 3 (a) figure and tilting section detect the average voltage of SBAD signal by detecting signal unit 111, the situation when tilting section 313 and tilting section 314 expressions detect the crest voltage of SBAD signal.Detect the average voltage or the crest voltage of SBAD signal, can select according to the state of the SBAD signal that is changed by the CD rotation is suitable.

And the recording layer of ground floor is that recording status also can be done similar detection.At this moment, the ground floor in the playback procedure writes down, so the reflectivity of CD reduces, so the output of detecting signal unit 111 changes to low voltage side.Among Fig. 3 (a), adjacent the 0th layer in the track same radius position of having write down with ground floor is under the situation of posting field (posting field), the output voltage of detecting signal unit 111 is reduced to V1L, the 0th layer is under the situation of not posting field, and the output voltage of detecting signal unit 111 increases and is V2L (318).

Address demodulating unit 113, the address of from the main beam signal, reading ground floor, this main beam signal is to be obtained by the main beam that, the main PD 106 that is used for main beam receives by the ground floor reflection.

Detecting unit 112 is obtained, and answers corresponding and the identical radial location of the start-of-record address value that is recorded in the posting field 301 on the 0th layer in advance (or end of record (EOR) address value), and comprises the limits of error address of the limits of error of ground floor orbital position.And, the address value of the ground floor of being read by address demodulating unit 113 is the limits of error address of ground floor, and when the signal level that is obtained by detecting signal unit 111 is identical with the predetermined level that is obtained by the 0th layer flare, detecting unit 112 is thought the structure of CD in specification limit, and wherein the 0th layer flare is to obtain from the 0th layer posting field 301.In addition, the limits of error are meant, the maximum error scope that can allow with the orbital position of the ground floor of the 0th layer start-of-record address (or end of record (EOR) address) same radius.

Further describe, inspection unit 112 obtain by the start-of-record address value that is recorded in the 0th layer posting field 301 (or end of record (EOR) address value) determine and the ground floor corresponding with start-of-record address value (or end of record (EOR) address value) same radius position on address--base address; Obtain from its base address along radial direction the address of position on ground floor--the limits of error address of only moving predetermined limits of error amount; And, the ground floor of determined CD is reset period, when reading limits of error address by address demodulating unit 113 (, the limits of error address location playback time of ground floor), only under the identical situation of detection level that the detection level that is obtained by detecting signal unit 111 and main beam posting field 301 reflex times on by the 0th layer obtain, detecting unit 112 just can be judged as: should be in the scope that the site error of the locational corresponding track of same radius between the 0th layer of adjacent recording layer and the ground floor is being scheduled to, and promptly the structure of determined CD is in specification limit.

(embodiment 1)

Utilize Fig. 4 and Fig. 5 that embodiments of the invention 1 are described.

Fig. 4 represents that the planned orbit zone of the 0th layer recording layer is a record (the 0th layer of posting field 301), and the recording layer of ground floor is the situation that does not write down (one deck is posting field 303 not).Owing to the reasons such as error of CD in making, there is the inconsistent situation of central point of 1 track 407 of the 0th layer the central point of 1 track 406 and ground floor, generation centre deviation amount Rd 408.The radius of the 0th layer and ground floor is respectively with 1 (404) expression of 0 (405), 1 layer of radius R of zero layer radius R.

The 0th layer of orbital region of going up record among Fig. 4, when CD rotate around rotation center C (409), owing to have deviation with the 0th layer central point, so the boundary position of orbital region (zero layer of posting field 301) and be rotated in variation synchronously about diametric(al).

Therefore, for example can there be error in the orbital position of the position of the 0th layer 1 track 406 ground floor identical with radial location.The maximal value of this error is expressed as maximum relative error Dmax (403), minimum value is expressed as minimum relative error Dmin (402).

For the X zone 410 of CD among Fig. 4, when moving optical picking-up head by playback limit, interior circumferential neighboring, the output of detecting signal unit 111 is shown in Fig. 5.

The determined CD that uses among Fig. 5 (DVD-RW double-layer CD 500) is carrying out record till from start address Z520 to end address Y530 on the 0th layer the recording layer.Limits of error B504 among the figure is meant the error range of the maximum that the orbital position of ground floor of the same radius of corresponding the 0th layer start-of-record address Z520 or end of record (EOR) address Y530 can allow.Limits of error B504, the inspection prior to the determined CD of checking object is pre-determined by following computing formula.

Limits of error B504 is the maximum eccentric error | Rd|501, zero layer beam radius Rb502, maximum allowance | and the sum of T|503.These limits of error B504 represents the error range of the maximum that the orbital position of ground floor same radius of corresponding the 0th layer planned orbit position can allow, and available following computing formula is represented.

Limits of error B=maximum allowance | T|+ maximum eccentric error | Rd|+ zero layer beam radius Rb

Maximum allowance | T|=0.04mm

The maximum eccentric error | Rd|=0.05mm

Zero layer beam radius Rb=L * tan (sin ^-1(NA/n))

(the laser NA of the thickness of L=wall, NA=determinator, n=refractive index)

Address z521 (first base address) is equivalent to, with the 0th layer start-of-record address Z520 (first presumptive address) address with the corresponding ground floor orbital position of same radius; Address y531 (second base address) is equivalent to, with the 0th layer end of record (EOR) address Y530 (second presumptive address) address with the corresponding ground floor orbital position of same radius.And, consider limits of error B504, be used for the ground floor mensuration address that determined CD is checked, under the situation of outer circumferential side, become the address My532 (second limits of error address) that obtains from inside Zhou Fangxiang (posting field 301 1 sides of radial direction) the only mobile limits of error B504 of address y531 (second base address); Under the situation of interior all sides, become the address Mz522 (first limits of error address) that obtains to peripheral direction (posting field 301 1 sides of radial direction) only mobile limits of error B504 from address z521 (first base address).

Measuring the ECC block address of address My532 and Mz522 can be tried to achieve by following formula.

Measure address My=YY+Ax-(B * (2 * Ry-B) * π)/C

Measure address Mz=ZZ+Ax+ (B * (2 * Rz-B) * π)/C

YY+Ax: y is identical with the address

ZZ+Ax: z is identical with the address

B: the limits of error (mm)

Ry: the radius of address Y

Rz: the radius of address Z

C: the area (mm that conversion coefficient is per 1 ²)

YY: with the value of the address date step-by-step negate of Y

ZZ: with the address date step-by-step negate of Z value

Ax: the difference value of corresponding zero layer

Among Fig. 5, optical picking-up head is moved to address My532 from address y531, before the arrival address My532, if the output of detecting signal unit 111 becomes voltage V1, then the error of internal Zhou Fangxiang is in allowed band.On the other hand, optical picking-up head is moved to address Mz522 from address z521, before the arrival address Mz522, (main beam is by the 0th layer of posting field 301 reflex time if the output of detecting signal unit 111 becomes voltage V1, according to its reflected light--the 0th layer of detection level that flare is obtained by detecting signal unit 111), then to the error of peripheral direction in allowed band.In addition, voltage V2 is a main beam by the 0th layer of posting field 302 reflex time not, according to its reflected light--and the 0th layer of flare, the detection level that obtains by detecting signal unit 111.

So, to inspection unit 112, measure the address location of address My532 and Mz522 at each, if the output of detecting signal unit 111 all is that (main beam is by the 0th layer of posting field 301 reflex time for the voltage V1 of predetermined level, according to its reflected light--the 0th layer of flare, the detection level that is obtained by detecting signal unit 111), then its result is exactly the specification that the error of corresponding orbital position satisfies the CD structure.In addition, the error that then is judged as corresponding orbital position does not satisfy the specification that CD is constructed.

In addition, the situation when 536 expressions of the tilting section 533 of figure and tilting section detect the average voltage of SBAD signal by detecting signal unit 111 among Fig. 5, the situation when tilting section 534 and tilting section 535 expressions detect the crest voltage of SBAD signal.Under the detection peak voltage condition, the tilting section of detecting signal unit curve of output becomes precipitous, judges that address My532 that is measured or the voltage of measuring address Mz522 become easier.And, detecting under the situation of mean value, the noise effect that can alleviate the SBAD signal can detect more stable voltage.In implementation process, rotating in the state of the SBAD signal that causes change by CD, can suit to select which is used.

In above-mentioned example, moving range and the moving range from address z521 to address Mz522 of moving range from address y531 to address My532, to these two movings range, obtain voltage V1 as the output of detecting signal unit 111, be the necessary condition of error in judgement in allowed band.According to situation, for example, can guarantee in moving range on one side, to obtain under the situation of voltage V1, can be with only in the moving range of another side, obtaining voltage V1, as the necessary condition of error in judgement in allowed band.

In addition, to address demodulating unit 113,, can detect the address location of CD no matter not posting field and posting field when carrying out address detected, are formed at the LPP signal of track ditch according to demodulation.As the address value that uses among the present invention, for example, can use the ECC block address at posting field, can use the LPP address at posting field not.Be recorded in the spy about the address information of LPP and open flat 10-293926 communique.

Process flow diagram when utilizing program to implement Fig. 5, embodiment illustrated in fig. 91 testing according to Figure 10 explanation.On ground floor, focus on and make it to carry out ground floor playback work (playback step 10).

The 0th layer at posting field 301 position playback ground floors, detect the signal level that is subjected to light signal of main beam flare on the 0th layer of posting field 301, and to establish this detection level be predetermined level V1 (predetermined level detection step 11).Can detect the peak value that is subjected to optical signal level this moment, also can detect the mean value that is subjected to optical signal level.

Secondly, calculate corresponding with the 0th layer of start-of-record address value Z520 and the ground floor orbital position of end of record (EOR) address value Y530 on same radius respectively each limits of error address value Mz522, My532 of comprising limits of error B504 and (calculate limits of error address step 12).

Then, each limits of error address location Mz522, My532 of playback ground floor.That is,, read each limits of error address Mz522, My532 (measuring address playback step 13) by the address demodulation.

Each limits of error address location playback time of ground floor, the detection signal level that is subjected to light signal by the 0th layer of flare light of main beam, when all the above-mentioned predetermined level V1 that obtains with the 0th layer of flare light of main beam from the 0th layer of posting field 301 was identical, the error that is judged as corresponding orbital position satisfied the specification of CD structure and (checks step 14).

(embodiment 2)

In embodiment 1, when resetting the recording layer of ground floor as shown in Figure 5, use is used for the photodetector of auxiliary bundle, detection is at the flare of the 0th layer recording layer reflection, but as other embodiment, in the time of also can resetting the 0th layer recording layer, be used for the photodetector of auxiliary bundle, detect flare in the reflection of ground floor recording layer.

Utilize Fig. 6 that embodiment 2 is described.The part identical with Fig. 3 represented with same label and omitted explanation.The determined CD (DVD-RW double-layer CD 600) that uses is provided with not posting field 602 of one deck posting field 601 and one deck, and the not posting field 603 of zero layer of resetting.At this moment, main beam focuses on the 0th layer recording layer (zero layer is posting field 603 not).

But the part of this main beam light beam shines the recording layer (one deck posting field 601) of adjacent ground floor through the 0th layer recording layer (zero layer is posting field 603 not).There is wall between this 0th layer and the ground floor, but because of it is extremely thin layer, so main beam 200 sees through the 0th layer recording layer and is reflected by the recording layer of ground floor, main beam 200 is as ground floor flare 609, almost turned back to around the photodetector in the optical picking-up head 100 by identical light path.

This ground floor flare 609 is subjected to light summation signals (SBAD signal 110) as the auxiliary bundle signal, is detected by the auxiliary 1PD 104 and the auxiliary 2PD 105 of the photodetector that is used for auxiliary bundle.

In addition, this SBAD signal 110 has used that two auxiliary 1PD 104 that are used for auxiliary bundle, auxiliary 2PD 105 accepted is subjected to the light summation signals, but uses an auxiliary PD signal that is used for auxiliary bundle also to be fine.

When main beam is reset the 0th layer recording layer (zero layer is posting field 603 not), the recording layer of ground floor is under the situation of one deck posting field 601, the output of detecting signal unit 111 is voltage V3H, the recording layer of ground floor is one deck not under the situation of posting field 602, and the output of detecting signal unit becomes voltage V4H (617).At the posting field 601 of ground floor track and the boundary vicinity of posting field 602 not, because the influence of main beam beam diameter, the SBAD signal is got current potential between it.

In addition, the situation when 616 expressions of the tilting section 615 of figure and tilting section detect the average voltage of SBAD signal by detecting signal unit 111 among Fig. 6, the situation when tilting section 613 and tilting section 614 expressions detect the crest voltage of SBAD signal.

The 0th layer recording layer is also can make similar detection under the situation about having write down.At this moment, the 0th layer is recorded, so reflectivity reduces, so output voltage changes to low voltage side.That is, voltage V3H changes voltage V3L into, and voltage V4H changes voltage V4L into.

In embodiment 2, in the zone that ground floor writes down determined CD, the start-of-record address is that address z521, end address are address y531, then can convert to obtain measuring the address and be respectively MZ523 and MY524 (with reference to Fig. 5).

And the output characteristics of the detecting signal unit 111 of Fig. 3 and Fig. 6 is identical.Therefore except the detection method part, structure and work are identical with embodiment 1, can check the error of orbital position between adjacent recording layer.Voltage V1 among the embodiment 1 (voltage V1H or voltage V1L) and voltage V2 (voltage V2H or voltage V2L) replace with voltage V3 (voltage V3H or voltage V3L) and voltage V4 (voltage V4H or voltage V4L) respectively in embodiment 2.

Under the situation of embodiment 2, also can for example, can guarantee in moving range on one side, to obtain under the situation of voltage V3 according to situation, will in the moving range of another side, obtain voltage V3, as the necessary condition of error in judgement in allowed band.

In addition, as explanation, can realize on computers by the function of program with above-mentioned each optical disk check device to Figure 10.This program can read storage on computers from recording medium, also can be by communication network transmission storage on computers.

Claims

1. optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Optical picking-up head, this optical picking-up head has for the signal of playback of recorded in the recording layer of above-mentioned CD, main beam is focused on the recording layer of playback object and shine, be used to accept first photoelectric conversion unit of the above-mentioned main beam of returning from above-mentioned CD reflection and be arranged at second photoelectric conversion unit around this first photoelectric conversion unit;

Detecting signal unit, for a recording layer in the above-mentioned several record layers is made as first recording layer, on second recording layer adjacent with this first recording layer, with the presumptive address on the track is that the border is provided with posting field and not the inspection object CD of posting field, when resetting above-mentioned first recording layer by above-mentioned optical picking-up head, above-mentioned detecting signal unit detects the signal level that is subjected to light signal, and the above-mentioned light signal that is subjected to is to receive the light signal that is subjected to that above-mentioned main beam by above-mentioned second recording layer reflection obtains by above-mentioned second photoelectric conversion unit;

The address demodulating unit at above-mentioned playback time, from receive being subjected to the light signal that above-mentioned main beam by the reflection of above-mentioned first recording layer obtains by above-mentioned first photoelectric conversion unit, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And

Inspection unit, obtain determining by the above-mentioned presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with above-mentioned presumptive address same radius position is a base address, obtain from this base address along radial direction the address of position on above-mentioned first recording layer of only moving predetermined limits of error amount, be limits of error addresses, at above-mentioned playback time, when reading above-mentioned limits of error address by above-mentioned address demodulating unit, only the detection level that obtains by above-mentioned detecting signal unit be above-mentioned main beam by above-mentioned second recording layer under the situation of the detection level that obtains of the above-mentioned reflex time of posting field, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

2. optical disk check device as claimed in claim 1 is characterized in that,

Above-mentioned inspection object CD, at above-mentioned playback time, above-mentioned first recording layer is in than the position of above-mentioned second recording layer further from optical picking-up head one side,

Above-mentioned detecting signal unit is the unit that detects the signal level that is subjected to light signal that received before arriving above-mentioned first recording layer, obtained by the hot spot light of the above-mentioned main beam of above-mentioned second recording layer reflection by above-mentioned second photoelectric conversion unit.

3. optical disk check device as claimed in claim 1 is characterized in that,

Above-mentioned inspection object CD, at above-mentioned playback time, above-mentioned second recording layer is in than the position of above-mentioned first recording layer further from optical picking-up head one side,

Above-mentioned detecting signal unit is to detect the unit that receives the signal level that is subjected to light signal that sees through after above-mentioned first recording layer, obtained by the hot spot light of the above-mentioned main beam of above-mentioned second recording layer reflection by above-mentioned second photoelectric conversion unit.

4. optical disk check device as claimed in claim 1 is characterized in that,

Above-mentioned detecting signal unit is, detects the peak value that is subjected to light signal or mean value as the above-mentioned unit that is subjected to the signal level of light signal that detects.

5. optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Detecting signal unit, for a recording layer in the above-mentioned several record layers is made as first recording layer, on second recording layer adjacent with this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, when resetting above-mentioned first recording layer by above-mentioned optical picking-up head, detecting signal unit detects the signal level be subjected to light signal, and the above-mentioned light signal that is subjected to is to receive the light signal that is subjected to that above-mentioned main beam by above-mentioned second recording layer reflection obtains by above-mentioned second photoelectric conversion unit;

Inspection unit, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, and, obtain equally by the second definite base address of above-mentioned second presumptive address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, and above-mentioned one side of obtaining from above-mentioned second base address along radial direction of posting field only moves the address of the position of above-mentioned limits of error amount at above-mentioned first recording layer, i.e. second limits of error address, at above-mentioned playback time, when reading above-mentioned first limits of error address and second limits of error address respectively by above-mentioned address demodulating unit, no matter when, only under the situation of the detection level that obtains by the above-mentioned detecting signal unit detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

6. optical disk check device as claimed in claim 5 is characterized in that,

7. optical disk check device as claimed in claim 5 is characterized in that,

8. optical disk check device as claimed in claim 5 is characterized in that,

9. optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Inspection unit, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, at above-mentioned playback time, when reading above-mentioned first limits of error address by above-mentioned address demodulating unit, only under the situation of the detection level that obtains by the above-mentioned detecting signal unit detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

10. optical disk check device as claimed in claim 9 is characterized in that,

11. an optical disk check device, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Optical picking-up head, this optical picking-up head has for the signal of playback of recorded in the recording layer of above-mentioned CD, main beam is focused on the recording layer of playback object and shine, be used to receive first photoelectric conversion unit of the above-mentioned main beam of returning from above-mentioned CD reflection and be arranged at second photoelectric conversion unit around this first photoelectric conversion unit;

Inspection unit, obtain determining by above-mentioned second presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned second presumptive address same radius position i.e. second base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned second base address along radial direction only moves predetermined limits of error amount, i.e. second limits of error address, at above-mentioned playback time, when reading above-mentioned second limits of error address by above-mentioned address demodulating unit, only under the situation of the detection level that obtains by the above-mentioned detecting signal unit detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

12. optical disk check device as claimed in claim 11 is characterized in that,

13. an optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Playback step, for a recording layer in the above-mentioned several record layers is made as first recording layer, on the second adjacent recording layer of this first recording layer, with the presumptive address on the track is that the border is provided with posting field and not the inspection object CD of posting field, for the signal of playback of recorded on above-mentioned first recording layer, main beam is focused on above-mentioned first recording layer and shine, obtain reflected light;

Signal detection step detects and to receive the signal level that is subjected to light signal that the above-mentioned main beam by above-mentioned second recording layer reflection obtains through opto-electronic conversion again;

The address demodulation step from receiving above-mentioned main beam by the reflection of above-mentioned first recording layer again through being subjected to the light signal that opto-electronic conversion obtains, is read the address of the orbital position that is in above-mentioned first recording layer in the playback procedure; And

Check step, obtain determining by the above-mentioned presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with above-mentioned presumptive address same radius position is a base address, obtain from this base address along radial direction the address of position above-mentioned first recording layer of only moving predetermined limits of error amount, be limits of error addresses, when reading above-mentioned limits of error address by above-mentioned address demodulation step, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

14. optical disk check method as claimed in claim 13 is characterized in that:

In above-mentioned playback step, in the above-mentioned inspection object CD, above-mentioned first recording layer is in than the position of above-mentioned second recording layer further from the plane of incidence one side of above-mentioned main beam,

Above-mentioned signal detection step detects and receives the signal level that is subjected to light signal that arrives before above-mentioned first recording layer, obtained through opto-electronic conversion by the hot spot light of the above-mentioned main beam of above-mentioned second recording layer reflection again.

15. optical disk check method as claimed in claim 13 is characterized in that:

In above-mentioned playback step, in the above-mentioned inspection object CD, above-mentioned second recording layer is in than the position of above-mentioned first recording layer further from the plane of incidence one side of above-mentioned main beam,

Above-mentioned signal detection step detects and receives the signal level that is subjected to light signal that sees through after above-mentioned first recording layer, obtained through opto-electronic conversion by the hot spot light of the above-mentioned main beam of above-mentioned second recording layer reflection again.

16. optical disk check method as claimed in claim 13 is characterized in that:

Above-mentioned signal detection step detects the peak value be subjected to light signal or mean value as the above-mentioned signal level that is subjected to light signal that detects.

17. an optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Playback step, for a recording layer in the above-mentioned several record layers is made as first recording layer, on the second adjacent recording layer of this first recording layer, being that the border is provided with posting field and not the inspection object CD of posting field as second presumptive address as the end of record (EOR) address on first presumptive address of start-of-record address and the track on the track, for the signal of playback of recorded on above-mentioned first recording layer, main beam is focused on above-mentioned first recording layer and shine, obtain reflected light;

Check step, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address on above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, and, obtain equally by the second definite base address of above-mentioned second presumptive address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, and above-mentioned one side of obtaining from above-mentioned second base address along radial direction of posting field only moves the address of the position of above-mentioned limits of error amount at above-mentioned first recording layer, i.e. second limits of error address, when reading above-mentioned first limits of error address and second limits of error address respectively by above-mentioned address demodulation step, no matter when, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

18. optical disk check method as claimed in claim 17 is characterized in that:

19. optical disk check method as claimed in claim 17 is characterized in that:

20. optical disk check method as claimed in claim 17 is characterized in that:

21. an optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Check step, obtain determining by above-mentioned first presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned first presumptive address same radius position i.e. first base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned first base address along radial direction only moves predetermined limits of error amount, i.e. first limits of error address, when reading above-mentioned first limits of error address by above-mentioned address demodulation step, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

22. optical disk check method as claimed in claim 21 is characterized in that:

23. an optical disk check method, to having the recordable CD of several record layers, inspection should be between adjacent recording layer the error of the corresponding orbital position in same radius position whether in preset range, it is characterized in that having:

Check step, obtain determining by above-mentioned second presumptive address in above-mentioned second recording layer, and the address in above-mentioned first recording layer corresponding with the above-mentioned second presumptive address same radius position i.e. second base address, obtain the address of position on above-mentioned first recording layer that above-mentioned one side of posting field from above-mentioned second base address along radial direction only moves predetermined limits of error amount, i.e. second limits of error address, when reading above-mentioned second limits of error address by above-mentioned address demodulation step, only under the situation of the detection level that obtains by the above-mentioned signal detection step detection level that to be above-mentioned main beam obtained by the above-mentioned reflex time of posting field of above-mentioned second recording layer, judgement should be between above-mentioned adjacent recording layer the error of the corresponding orbital position in same radius position in above-mentioned preset range.

24. optical disk check method as claimed in claim 23 is characterized in that: