JPH087282A - Optical information recording medium and optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce read-out error in both a land and a group in a guide groove by newly providing an L/G selecting system, a polarity inverter and a waveform setting part. CONSTITUTION:This device is applied to a recording medium having a recessed part (land) and a projecting part (group) on a substrate and composed of an optical disk l, a spindle motor 2, an optical pickup 3 and five circuit systems controlling the respective parts of a light modulator system 4, control system 5, a signal reproducing system 6, an L/G selecting system 7 and a system controller 8. The L/G selecting system 7 selects tracking operation either on the projecting part (group) or on the recessed part (land) of the guide groove. The polarity inverter 18 of the control system 5 inverts the polarity of tracking linked with the L/G selecting system 7 and, at the same time, the waveform setting part 24 of the light modulator system 4 sets the condition of light irradiation corresponding to the land and the group, respectively. Consequently, the difference of a recording characteristic generated between the group and the land at the time of irradiating the light and signals with few distortion are recorded in both parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium and an optical recording / reproducing apparatus capable of recording and reproducing information by using a light beam, and more particularly to a signal for both a land and a groove of a guide groove. The present invention relates to an optical information recording medium and an optical recording / reproducing apparatus capable of obtaining a high track density by recording.

[0002]

2. Description of the Related Art As a recording medium (recording member) for recording or reproducing information by using optical means, an optical disc,
Optical cards or optical tapes are known. A laser beam is generally used as a light source for recording on these recording media, and information is recorded by irradiating a recording thin film of the recording medium with a laser beam that is minutely focused through a lens.

Among these recording media, an optical disk is basically composed of a circular substrate having spiral or concentric guide grooves on the surface thereof and a recording thin film formed thereon. . Information is recorded on the recording thin film by irradiating a beam, the intensity of which is modulated according to the information signal, along the guide groove.

The recording thin film is required to have the property that the physical properties of the thin film change due to the irradiation of light and that the state difference before and after the change can be optically detected. Typical changes in the physical properties of the recording thin film include deformation of the thin film due to absorption of light, or phase change of the thin film due to light irradiation.
They are known as a modified recording medium and a phase change recording medium, respectively. In recording by changing these physical properties, a signal is reproduced as a difference in the amount of reflected light.

Further, a magneto-optical recording medium is known in which information is recorded by applying a magnetic field at the same time as light irradiation and the Kerr effect is used to detect a difference in the magnetization direction of a recording thin film to reproduce a signal. ing.

These optical recording media have been put to practical use according to their respective uses, and in order to further increase the amount of recordable information, investigations for increasing the recording density are being actively conducted.

As one of methods for increasing the recording density of an optical information recording medium, in contrast to the conventional method of recording a signal in either the concave portion or the convex portion of the guide groove, the concave portion and the convex portion of the guide groove are used. A method of recording signals in both sides has been proposed (Japanese Journal of Applied Physics Vol.32 (1993).
p.5324-5328).

The method shown here uses a substrate in which the recesses and protrusions of the guide groove have substantially the same width and the depth is optimized, so that information signals can be applied to both the recesses and protrusions. It has been realized to record and reproduce. Hereinafter, in this specification, a convex portion with respect to the light incident side is referred to as a groove,
The case of recording on the convex portion is referred to as groove recording. Further, a portion on the concave side with respect to the incident side is called a land, and a case of recording on the concave portion is called a land recording. By using the method of recording signals on both the land and the groove, it is possible to double the track density as compared with the conventional method of recording on only one side of the guide groove.

In recording and reproducing information by this method, the same optical system and optical recording system as the conventional one can be used in principle, and the polarity of tracking is simply set to correspond to the concave or convex portion of the guide groove. This can be realized by adding a switching means and irradiating both regions with a light beam whose intensity is modulated according to the information signal.

[0010]

However, in the above-mentioned prior art, when the signal recorded on the recording medium is reproduced, there is a problem that the reproduced signal is different in amplitude and frequency characteristic between the land and the groove. there were. This difference in signal amplitude also changed depending on the structure of the recording thin film.

Therefore, in the process of demodulating the reproduced signal, even if good signal recording can be performed on one track of the land and the groove, many errors may occur on the other track.

Further, even if the recording thin films having the same structure are used, when the shape of the edge of the guide groove or the groove width is changed,
The same reproduced signal is different between both tracks.

In addition, there is a problem that the optical information recording medium needs to be manufactured with high processing accuracy in order to reduce read errors in both the land and the groove.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical recording medium with little read error in both the land and the groove of the guide groove, and the recording / reproducing thereof. To provide a device.

[0015]

An optical information recording / reproducing apparatus of the present invention comprises a recording thin film on a substrate having a guide groove composed of a concave portion and a convex portion to cause a change which can be optically detected by irradiation of light. An information signal is recorded / reproduced on both the concave portion and the convex portion of the guide groove of the recording medium provided,
An optical means having a light source and condensing a light beam emitted from the light source on the recording medium by using an objective lens, and a control for matching the converging position of the light beam and the position of the recording thin film are performed. A focus control means, a tracking control means for controlling the light beam position of the guide groove in a substantially vertical direction to follow the light beam in the guide groove, and a guide for recording the information signal or reproducing the recorded information signal. Selection means for selecting which of the concave portion and the convex portion of the groove should be performed, a polarity inverting means for inverting the polarity of the output signal of the tracking control means according to the selection result of the selection means, and the information signal In conformity with the above, a waveform setting means for setting a modulation pattern of the light beam applied to the recording medium, and demodulating an information signal from reflected light or transmitted light from a recording mark recorded on the recording medium And a No. reproducing means, said focus control means, said tracking control means, the waveform setting section,
And at least one of the signal reproducing means is provided with two or more kinds of operating conditions for recording and reproducing the information signal in the concave portion and the convex portion of the guide groove, and according to the selection result of the selecting means,
The above-mentioned object is achieved by the configuration selected by the operating condition.

Further, another optical information recording / reproducing apparatus of the present invention is provided with a recording thin film on a substrate having a guide groove composed of a concave portion and a convex portion to cause a change which can be optically detected by irradiation of light. An information signal is recorded / reproduced on both the concave portion and the convex portion of the guide groove of the recording medium, which has a light source, and collects a light beam emitted from the light source on the recording medium using an objective lens. The optical means for emitting light, the focus control means for controlling the converging position of the light beam and the position of the recording thin film, and the light beam position in the substantially vertical direction of the guide groove are set in the guide groove. Tracking control means for controlling the tracking of the beam; selecting means for selecting which of the concave portion and the convex portion of the guide groove is to record the information signal or reproduce the recorded information signal; According to the selection result of the selection means, Polarity inverting means for inverting the polarity of the output signal of the tracking control means, and at least two or more types of modulation patterns that conform to the information signal and record the information signal in each of the concave and convex portions of the guide groove, And a light modulator for modulating the intensity of the light beam according to the modulation pattern of the waveform setting unit, the waveform setting unit outputting any one of the modulation patterns according to the selection result of the selecting unit. As a result, the above object is achieved.

The waveform setting means has a multi-pulse modulation function for irradiating one recording mark to be recorded on the recording medium with light composed of a plurality of pulse trains. Between the modulation patterns of
The waveforms of a plurality of pulse trains may be different.

The two or more types of modulation patterns of the waveform setting means may be arranged to change the power of the light beam.

The recording / reproducing apparatus includes signal reproducing means for demodulating an information signal from reflected light or transmitted light from a recording mark recorded on a recording medium, and the waveform setting means comprises:
Before recording an information signal on this recording medium, a plurality of pulse patterns for irradiating the concave and / or convex portions of the guide groove with light beams having different modulation patterns in a region close to the information recording region on the recording medium are stored. The recording medium is provided with the recording condition setting means, and the light modulating means irradiates the light beam modulated in accordance with the plurality of pulse patterns to form a plurality of recording marks on the recording medium. The obtained information signal is demodulated by the signal reproducing means, and the qualities of a plurality of reproduced signals obtained by the signal reproducing means are compared,
A configuration may be adopted in which optimum recording conditions are determined for the concave portion and the convex portion of the guide groove.

Recording condition recognition means for reading a recording condition identifier for correcting the characteristic difference between the concave portion and the convex portion of the guide groove is provided in a specific area outside the information recording area of the recording medium,
The recording condition recognition means may operate the optical means based on the read information.

Further, another optical information recording / reproducing apparatus of the present invention is provided with a recording thin film on a substrate having a guide groove composed of a concave portion and a convex portion to cause a change which can be optically detected by irradiation of light. An information signal is recorded / reproduced on both the concave portion and the convex portion of the guide groove of the recording medium, and recording of this information signal or reproduction of the recorded information signal is performed.
Selector for selecting which of concave and convex surfaces of the guide groove is to be used, and an optical means having a light source and condensing a light beam emitted from the light source on a recording medium using an objective lens. And at least 2 with respect to the concave and convex portions of the guide groove.
Focus control means having offset setting means for giving offsets of one or more levels, and performing control to match the focus position of the light beam with the position of the recording thin film by using the offset selected according to the selection result of the selection means. And tracking control means for controlling the light beam position in the substantially vertical direction of the guide groove to follow the light beam in the guide groove, and polarity reversing means for reversing the polarity of the output signal of the tracking control means according to the selection result of the selecting means. By the configuration with and,
The above object is achieved.

This recording / reproducing apparatus has a signal reproducing means for demodulating an information signal from reflected light or transmitted light from a recording mark recorded on a recording medium, and a focusing means for recording / reproducing a reference signal. A focus condition setting unit that stores a plurality of offset levels is used, and before the information signal is recorded / reproduced on / from the recording medium, the plurality of offset levels are used in an area near the information recording area on the recording medium. Are irradiated to the concave and / or convex portions of the guide groove to form a plurality of recording marks, a light beam is used, and a reproduction signal obtained from the plurality of recording marks is demodulated by the signal reproducing means and obtained by the signal reproducing means. A configuration may be adopted in which the qualities of a plurality of reproduced signals thus obtained are compared to determine the optimum offset level for the concave and convex portions of the guide groove.

The recording / reproducing apparatus includes signal reproducing means for demodulating an information signal from reflected light or transmitted light from a recording mark recorded on the recording medium, and the focusing means comprises:
The recording medium has focus condition setting means for storing a plurality of offset levels for recording / reproducing the reference signal, and before recording / reproducing the information signal on the recording medium, the light beam is emitted in an area close to the information recording area on the recording medium. Irradiating the concave portion and / or the convex portion of the guide groove to form a plurality of recording marks,
A light beam is emitted using a plurality of offset levels, a reference signal obtained from a plurality of recording marks is demodulated by a signal reproducing means, the qualities of a plurality of reproducing signals obtained by the signal reproducing means are compared, and a guide groove is obtained. The optimum offset level may be determined for the concave portion and the convex portion.

Interlocking with the operation of the polarity reversing means, there is provided jump means for moving the half-track spectral beam from the concave portion of the recording medium to the adjacent convex track or from the convex portion to the adjacent concave track. In the operation of, the offset may be an intermediate value between the offsets of the focusing means set for the concave portion and the convex portion of the recording medium.

The tracking control means has a second offset setting means for giving an offset of at least two levels, and the offset level of the second offset setting means is switched according to the selection result of the selection means. Good.

Further, another optical information recording / reproducing apparatus of the present invention is provided with a recording thin film on a substrate having a guide groove composed of a concave portion and a convex portion to cause a change which can be optically detected by irradiation of light. An information signal is recorded / reproduced on both the concave portion and the convex portion of the guide groove of the recording medium, and has a light source, and a light beam emitted from the light source is condensed on the recording medium using an objective lens. Optical means, focus control means for controlling the converging position of the light beam and the position of the recording thin film, and light beam position in a substantially vertical direction of the guide groove, and tracking control of the light beam in the guide groove. Tracking control means, a selection means for selecting which of the concave portion and the convex portion of the guide groove the recording of the information signal or the reproduction of the recorded information signal is performed, and the selection result of this selection means , Truckin Polarity inverting means for inverting the polarity of the output signal of the control means, and the information signal from the reflected light or transmitted light from the recording mark recorded on the recording medium, according to the selection result of this selecting means, the concave portion of the guide groove The above object can be achieved by a configuration including at least two or more signal demodulating conditions for demodulating the information signal of the convex portion.

The at least two or more demodulation conditions may be equalization conditions having different amplification characteristics with respect to frequency.

The signal reproducing means comprises at least two or more level setters for generating reference signals of different levels and a comparator for comparing the reference signal with the information signal from the recording medium, and at least two or more demodulators. The condition may be a configuration that is a reference signal for binarization.

A reference recording mark, which is provided in a specific area outside the information recording area of the recording thin film and is previously recorded in the concave and convex portions of the guide groove, is reproduced before demodulating the information signal from the recording medium, The demodulation condition of the signal reproducing means may be changed stepwise to demodulate, the demodulated reference recorded signals are compared, and the optimum demodulation condition may be determined.

Further, the optical information recording medium of the present invention comprises a substrate having a guide groove composed of a concave portion and a convex portion, and a recording thin film which is provided on the substrate and produces a change which can be optically detected by irradiation of light. The above-described object is achieved by a structure having a land / groove identifier indicating a difference in characteristics caused by the concave portion and the convex portion of the guide groove in a specific area outside the information recording area of the recording thin film.

The land / groove identifier may be provided with information indicating a light irradiation condition at the time of recording.

The land / groove identifier may be provided with an identifier consisting of information on the groove shapes of the concave portion and the convex portion of the guide groove.

Further, this land / groove identifier is
Provided in the concave and convex portions of the guide groove, which are adjacent areas on the same plane of the information recording area of the optical information recording medium,
It may be a reference recording mark that determines the reproduction condition of the information signal recorded in the information recording area.

[0034]

Function: Focus control means, tracking control means,
At least one of the waveform setting means and the signal reproducing means is provided with an operating condition for recording and reproducing the information signal in the concave portion and the convex portion of the guide groove, so that the concave portion and the convex portion are selected according to the selection result of the selecting means. Appropriate operating conditions are selected. Since this operating condition can be set individually for the concave portion and the convex portion, recording / reproduction can be performed under the optimal condition with little reading error for both the concave portion and the convex portion.

When the waveform setting means has two or more types of modulation patterns as operating conditions, the intensity of the light beam can be changed between the signal recording on the concave portion and the signal recording on the convex portion. It is possible to correct the temperature rise and the difference in cooling conditions that occur when the concave and convex portions of the groove are irradiated with the light beam.

When the focus control means or the tracking control means has operating conditions for recording / reproducing information signals in the concave and convex portions of the guide groove, the recording thin film and convex recording of the concave portion of the guide groove Since an offset can be given to both of the thin films so that the light beam can be accurately focused, the optimum light beam can be irradiated during recording and reproduction.

When the signal reproducing means has operating conditions for recording and reproducing the information signal in the concave portion and the convex portion of the guide groove, the information signal from the recording mark recorded in the concave portion and the convex portion are formed. Even if there is a difference between the information signal from the recorded recording mark and the demodulation conditions such as the equalizing characteristic or the slice level, the demodulation signals from the concave and convex portions of the guide groove can be aligned.

Further, before recording / reproducing the information signal, the optical information recording medium and the optical information recording / reproducing apparatus in use are pre-recorded / reproduced by using the reference signal in a predetermined area of the optical information recording medium. By setting the optimum operating conditions for the optical information recording medium and the optical information recording / reproducing apparatus, individual differences can be compensated.

Furthermore, by giving a characteristic identifier to the optical information recording medium in advance, the individual difference of the optical information recording medium can be compensated.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the optical information recording medium and the optical information recording / reproducing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the optical information recording / reproducing apparatus of the present invention. The optical information recording / reproducing apparatus of the present invention condenses a light beam generated from a spindle motor 2 for rotating an optical disc 1 which is an optical information recording medium provided with a guide groove having irregularities, and a light source such as a laser beam. The optical pickup 3 is composed of the following five circuit systems for controlling the respective parts. The first is an optical modulation system 4 that drives the light source of the optical pickup. The second is a control system 5 that controls the operation of a light beam such as tracking for collecting the light emitted from the pickup on the optical disc 1 and causing the light beam to follow the guide groove. The third is a signal reproducing system 6 for reading an information signal formed on the optical disc. At least one of each of these three circuits is
Two or more types of condition setting functions are provided so that optimum conditions can be set for each of the land and groove of the guide groove.

Fourth, a land / groove selection system (hereinafter, L / G) that switches the above-mentioned three circuit conditions depending on whether the light beam follows the land or the groove of the guide groove.
It is also expressed as a selection system) 7. The fifth is a system control system 8 that controls the timing of the operation of the four circuits.

According to the present invention, when recording or reproducing information on both the land and the groove of the optical disc, the L / G selection system 7 is used to optimally select the conditions of the above-mentioned circuit system to thereby eliminate the error. It enables recording and reproduction of a small amount of information.

As shown in FIG. 2, the optical disc 1 has a structure in which a recording thin film 26 showing an optically detectable change is provided on a substrate 25 having a guide groove formed on its surface as an irregularity. Examples of the recording thin film 26 include deformation recording accompanied by a shape change of the thin film due to heat of a light beam, phase change recording utilizing a change in phase state of the thin film, magneto-optical recording utilizing a change in magnetization direction, photochromic material, and the like. As described above, a thin film whose recording state changes by utilizing light energy can be applied. Further, an uneven pit may be provided near the center of both the land and the groove of the guide groove to provide information. In this case, it is impossible to record information, and the medium is a read-only medium.

When reproducing the information signal recorded on the optical disc, the spindle motor 2 is driven by the rotation control unit 9 based on an instruction from the system control system 8 to rotate the optical disc 1 as a recording medium at a constant speed. Let Next, a control signal indicating the reproduction state is input from the system control unit 8 to the laser drive unit 10, and the current flowing through the light source 11 is controlled so that the intensity of the light emitted from the optical pickup 3 becomes constant.

The light beam emitted from the light source 11 passes through the optical system of the pickup 3 and the final objective lens 12 to become a condensed beam, which is applied to the optical disc 1. The light beam reflected by the optical disc 1 is again reflected by the objective lens 12,
The light enters the photodetector 13 having a light receiving surface divided into a plurality of parts through the optical system in the pickup.

The photodetector 13 photoelectrically converts the incident light and outputs a voltage signal corresponding to the change in the amount of light on each light receiving surface. The output signal of the photodetector 13 is amplified by the preamplifier 14, and the light beam position is controlled using the low frequency component therein.

Specifically, the focus control unit 16 obtains a focus error signal by using a part of the output signal from each light receiving surface of the photodetector 13, and according to the signal, a voice coil of the optical pickup 3 is obtained. By driving 15 to finely move the objective lens 12 in the direction perpendicular to the optical disc surface, control is performed so that the light spot is focused on the recording thin film on the optical disc 1. The tracking control unit 17 also obtains a tracking control signal from another combination of output signals of the photodetector 13 so that the light beam follows the guide groove, and the voice coil 1
The control for slightly moving 5 in the radial direction of the optical disk is performed.

Next, the polarity of the output from the tracking controller 17 is inverted by the polarity reversing device 18 depending on which of the land and the groove of the guide groove the light beam follows. It should be noted that, according to the control signal of the system control system 8, the L / G selection system 7 including the optical modulation system 4 and the signal reproduction system 6 for selecting the condition of the land / groove is instructed, and the inversion operation by the polarity inverter 18 is performed. Is done. As a result, the light beam can be made to follow the groove portion or the land portion of the guide groove formed on the optical disc.

Further, when the recording medium is manufactured and / or the quality of the apparatus is operated, variations in the shape of the guide groove, distortion of the intensity distribution of the light beam of the recording / reproducing apparatus, a photodetector, etc. There are variations in sensitivity. Therefore, during the servo operation, an error voltage of a signal that does not originate from the recording medium is generated in either the tracking error signal or the focus error signal generated depending on which of the land and the groove of the guide groove is irradiated with the light beam. To do.

In order to correct the error of these control signals, L
The offset adjustment is performed for each control unit in conjunction with the setting of the / G selection system 7. For example, by applying a small offset to the focus control signal, the focus shift that occurs between the land and the groove is corrected, and by applying the offset to the tracking control signal as well, the tracking shift is corrected. With the above configuration, the optimum condensing state can be obtained in both the land and the groove.

When the light beam is moved to the adjacent track during the tracking operation, the jumping circuit 19 outputs the pulse voltage for instantaneously moving the voice coil 15 in the radial direction to the output signal of the polarity inverter 18. Superimpose. The movement from a groove to an adjacent groove or from a land to an adjacent land is defined as a 1-track jump,
A movement from a groove to an adjacent land or vice versa is defined as a half track jump. In the half-track jump, it is necessary to reverse the polarity of tracking by the polarity inverter 18 at the same time as applying the jumping pulse. The jumping circuit 19 enables the light beam to follow an arbitrary track designated by the system control unit 8.

The binarization unit 20 of the signal reproduction system 6 uses the high frequency component of the signal from the preamplifier 14 and compares the signal level with a reference level to convert it into a binarized signal. Next, the decoder 21 decodes the binarized signal according to a predetermined signal format. As a result, the information signal from the recording mark formed on the optical disc 1 is demodulated, and the data signal is sent to the external device according to the instruction of the system control unit 8.

If necessary, the L / G condition identifying section 22 demodulates information regarding recording or reproduction of the land and groove formed in a specific area on the optical disc 1. The information recognized by the L / G condition identifying unit 22 is preferably recorded and stored in the manufacturing process of manufacturing the recording medium. The contents are information for correcting the characteristic difference between the land and the groove, and include information such as optimum conditions for light irradiation on both sides, optimum conditions for focus control or tracking control, and optimum conditions for reproduction signal demodulation. .
Alternatively, information about the shape of the guide groove, such as groove width,
It may be groove depth, pitch, surface property, etc. In this case, after identifying this value, optimum recording conditions, servo conditions, and reproduction conditions may be determined from the correlation determined in advance from this shape information. .

Next, regarding the signal recording on the recording medium, the difference generated between the land and the groove during recording will be described.
Most of the recordable recording media shown so far are
By absorbing the irradiated light, the temperature of the recording thin film rises, and a recording mark is formed according to the temperature change. Therefore, even if the energy of the recorded light is constant,
The shape of the recording mark varies depending on the degree of thermal diffusion of the recording thin film. Specifically, the difference in the surface condition such as the surface roughness between the land and the groove, which occurs in the process of forming the guide groove, the difference in the shape of the guide groove edge for separating each, or the difference in the shape of the guide groove and the recording thin film. It is considered that there is a difference in temperature rise or cooling conditions after temperature rise due to a difference or the like.

In order to deal with this, when recording a signal on a recording medium, first, the system control unit 8 shown in FIG. 1 outputs a recording signal S01 consisting of information to be recorded at a predetermined timing to the optical modulation system 4. take in. The encoder 23 of the light modulation system 4 converts the recording signal into a recording signal of a predetermined format.

Next, pulse division or intensity change is set for the signal converted according to the conditions of the waveform setting section 24, and the laser drive section 10 modulates the light intensity of the light source 11. The recording thin film on the optical disc 1 absorbs the intensity-modulated light to form a recording mark and signal recording is performed. The waveform setting section 24 has a recording pattern optimized for recording on lands and grooves, and changes its output in synchronization with the output of the L / G selection system 7. As a result, the laser drive unit 10 intensity-modulates the light source 11 based on the modulation waveforms corresponding to the land and the groove.

With the above structure, it is possible to record a signal on the recording thin film or reproduce the recorded information signal under the optimum conditions for both the land and the groove. Detailed examples of each specific operation will be described below.

(Embodiment 1) Here, a specific example of a method of setting independent recording conditions for each of the land and the groove when recording the information signal on the optical information recording medium will be described. By switching the modulation waveform of the light at the time of recording depending on which surface the signal is recorded, the difference in the thermal conditions generated between the land and the groove is compensated, and a recording mark with less distortion is obtained on both sides. FIG. 3 shows the waveform setting section 2 of the optical modulation system 4.
4A and 4B, and FIG. 4A and FIG. 4B show setting patterns generated in the waveform setting unit. 4 (a) and (b)
Indicates patterns used for recording on the land and the groove, respectively. Further, FIG. 5 shows the optical output output from the optical pickup 3 and the recording marks recorded on the optical information recording medium based on the signal input to the optical modulation system 4 and the signal output from the optical modulation system 4. 3 is a chart showing the timing of the above.

The waveform setting section 24 shown in FIG. 1 uses the reference pulse pattern 31 for land and groove as shown in FIG.
pattern setters 31, 3 having s and 32s on the memory
2, a pattern selector 33 for selecting one of the patterns, and a pulse modulator 34 for converting a code signal into a pulse pattern.

According to the output signal 7s of the L / G selector which operates depending on whether to record on the land or the groove, the pattern selector 33 causes the output signal 31 of the pattern generator.
Either the pulse pattern of s or 32s is selected. The pulse modulator 34 outputs a modulation pulse 34s corresponding to the inversion interval of the code signal 23s of the encoder 23 based on the output pattern from the pattern selector 33, and irradiates a focused beam on the optical information recording medium. Power Pp, P
A waveform that changes between the voltages Vp, Vb, and Vr corresponding to b and Pr is output to the laser drive unit 10. Laser drive unit 1
0 converts the output signal 34s of the pulse modulator 34 into a voltage-current and modulates the light source 11. As a result, pickup 3
Emits a light beam having a predetermined output waveform 11s,
Predetermined information is recorded on the optical information recording medium 1.

The parameters set in the pattern modulator and included in the pulse pattern are shown only by the pulse arrangement and pulse width in FIGS. 4 and 5, but the pulse interval and the pulse height (irradiation power) are further shown. It is also effective to change. In particular, when the land and groove have the same shape of the recording marks formed on the recording medium and the difference is only in size, or when the modulation method is less susceptible to the difference in the shape of the recording marks, this irradiation All you have to do is set the power for the land and groove. In this case, the setting circuit can be greatly simplified.

As shown in FIG. 4, in the pulse patterns set in the pattern setters 31 and 32, when the intensity is modulated based on the level of the encoder output 23s, that is, the mark length recording and the level of the encoder output 23s are included. There is a case where a pulse is generated every time it is inverted, that is, mark position recording.

In the case of corresponding to the mark length recording, a multi-pulse modulation method for forming a plurality of pulse trains for one signal inversion is used as shown in FIG. This is used to prevent the recording mark from being distorted due to heat transfer on the recording thin film when the optical information recording medium is irradiated with light. That is, a symmetrical recording mark is recorded by setting the energy density high at the inverted portion of the signal and the recording start point and setting the energy density low thereafter. As a result, the temperature of the recording thin film becomes substantially constant at the start and end of recording, and symmetrical recording marks can be obtained.

However, as described above, the heating and cooling conditions of the recording film are different between the land and the groove even if the light irradiation conditions are the same. Therefore, in the present invention, a pulse pattern that is an optimum light irradiation condition is set for each of them. When the encoder 23 is compatible with EFM (8-14 conversion) modulation used in, for example, a compact disc, assuming that the clock cycle is T, the inversion interval of the signal 23s is 9T of 3T to 11T.

In this case, as shown in FIGS. 4 (a) and 4 (b), nine types of setting patterns for recording on the land and the groove are stored in the pattern setters 31 and 32, respectively. Then, the pattern setters 31 and 32
The nine types of patterns read from are the pattern selector 3
3 and the pulse modulator 34 selects a pattern having a cycle corresponding to the inversion interval of the encoder output 23s.

On the other hand, in the case of mark position recording, the shape of the recording marks formed on the optical information recording medium is the same, and the interval thereof becomes an information signal, so the pattern generator 3
For 1 and 32, it suffices to set one type of pulse pattern consisting of a pulse width and a power value for each of the land and the groove, and the pattern generator has a simpler structure than the mark length recording.

Up to this point, the method of storing the pulse patterns corresponding to the lands and the grooves in the memory of the pattern generators 31 and 32 in advance has been described. However, when the pulse patterns correspond to different types of recording media, If an attempt is made to perform recording with higher quality, there are the following two methods.

The first method is to carry out preliminary recording (test writing recording) in advance before recording an information signal. The first method involves variations between optical information recording media, differences between recording / reproducing devices, and recording / reproducing devices. It corrects the characteristic difference between the land and the groove, including changes in the ambient temperature and the attachment of dust to the recording medium or the optical system.

In this case, if a fluctuation factor that causes fluctuations in the recording conditions of the recording medium is detected, trial writing recording is performed each time to select the optimum pulse pattern and reset the pulse pattern. . FIG. 8 is a flowchart explaining the trial writing process, and FIG. 6 is a perspective view of the optical disc. FIG. 7 shows a pulse pattern used for trial writing. The trial writing process will be described with reference to these drawings.

In the trial writing process, the reference signal S0 indicating that the variation factor of the optical information recording medium shown in FIG. 1 has occurred.
When 3 is input to the system control unit 8, the operation starts. As shown in FIG. 8, the trial writing starts in response to an instruction to start 81 the trial writing from the system control unit 8. As shown in FIG. 6, the position of the light beam 27 used for recording and reproduction is set to the information area 61 of the optical disk 1 and the adjacent test area 62 on the same plane by the instruction 82 for moving to the test area 62 of the optical disk 1. To move.

Next, according to the instruction of the pattern setting 83, the first pulse pattern in the recording condition setting device 36 (FIG. 3) which stores a plurality of pulse patterns is changed to the pattern setting device 3.
Read in 1 and 32.

Next, the drive circuit 1 according to the recording pattern.
0 is operated (FIG. 1), and modulated light is first irradiated onto the groove according to the instruction of the light irradiation 84. Then, a series of light irradiation is performed on the land by the same method.

The recording condition setter 36, as shown in the example of 15 kinds of 11T pulse patterns in FIG. 7, records so as to obtain a recording mark symmetrical with respect to the conditions of the environment in which the recording medium and the apparatus are used. A start point and a pulse pattern after which the energy distribution is changed are set. These pulse patterns confirm the existence of the next pulse pattern 8
In this example, 15 types of patterns are sequentially output according to the determination result of 5. As a result, recording marks having different shapes corresponding to the recording conditions are formed on the recording medium.

Next, the signal is reproduced from the recording mark on the recording medium. At this time, the error rate of the reproduced signal from each recording mark is detected in the error detecting step 86, and the value is compared in the error rate comparing step 87 to obtain the optimum recording condition. Error rate detection is
The optimum pattern is selected by using the error correction signal generated in the process of demodulating the data by the decoder 20 and comparing the error rates by the system control unit 8 to obtain the recording condition with the minimum error rate. . By performing this test writing process on both the land and the groove, the optimum pulse pattern can be obtained for each.

If it is desired to shorten the time required for the test writing process or to simplify the circuit, this process can be sequentially omitted. The correlation between the land and the groove is obtained in advance, and for example, trial writing is performed only on the land to obtain the optimum pulse pattern of the land. Next, the groove pulse pattern can be obtained based on the above-mentioned correlation.

The condition for operating the recording condition setting device 6, that is, the condition for the reference signal S03 to be in an operating state, is that when the optical disc is replaced, when the disc drive is started, when the temperature of the use environment changes more than a certain value, There may be a case where a certain time has elapsed after setting, or an error of a certain amount or more is detected from the reproduced signal. Detection at the time of disc replacement or drive startup can guarantee changes between the disc and the drive or variation factors between them. Further, by managing the temperature change of the use environment and the time elapsed from the setting of the recording condition, it is possible to compensate the temperature dependency of the recording medium or the fluctuation of the control state of the drive.

The second method corresponds to recording the optimum recording condition or the identifier of the recording condition for each of the land and the groove in advance in a specific area of the optical information recording medium. The identifier has optimum pulse pattern information for both the land and the groove, and is provided in the inner peripheral portion or outer peripheral portion outside the information area of the optical disc in a form conforming to the information signal or the address signal. For example, it may be a position corresponding to the information area 61 of the optical disc 1 shown in FIG.

The form of the identifier in this case may be the same as that of the information signal, but from the viewpoint of improving the reading accuracy, it may be a code signal having a relatively low recording density with respect to the information signal. Desirably, it is more desirable to provide the guide groove on either the land or the groove.
The identifier of this form is used for the signal reproduction system 6 like the information signal.
After that, the reproduced signal is binarized at a predetermined level, and then the L / G condition recognizer 22 demodulates the information.
Based on this result, the system control unit 8 sets the recording conditions of the light modulation system 4.

Other identifiers may be provided depending on the scale of the device, such as printing information on a part of a protective plate or cartridge provided to protect the medium, forming a specific shape, or providing a semiconductor memory. Can take various forms. The information from these identifiers is read by the system control unit 8 when the optical information recording medium is attached to the recording / reproducing apparatus, and the patterns are set in the pattern generators 31 and 32 according to the contents. With the above configuration, it is possible to optimally set the light irradiation conditions according to the type of recording medium.

With the above configuration, the recording condition is set each time according to the reference signal for setting the recording condition of the optical disc, and the data can be recorded in the optimum state at all times. The reliability as a data recording device is improved.

(Embodiment 2) In this embodiment, when the optical information recording medium is irradiated with the light beam, the servo condition is switched between the land and the groove so as to follow the optimum focusing and the guide groove on both sides. A method of enabling tracking of the data will be described.

A knife edge method or an astigmatism method is known as a focusing technology for converging a light beam onto an optical information recording medium. The knife edge method requires the positional accuracy of optical components. Therefore, there is a problem that the detection system becomes large. On the other hand, if the astigmatism method is used, it is easy to downsize the detection system. However, when trying to focus on both the land and the groove that are the objects of the present invention,
In the ideal state, there is no difference in focus control between the land and the groove, but if there is a slight distortion in the shape of the guide groove or the beam spot, the distribution of the reflected light beam from the recording medium will be the pattern on the photodetector 13. There is a problem that there is a difference between the two.

In this embodiment, a method of compensating for the difference in the light spot on the photodetector 13 between the groove and the land by applying an offset to the focusing control signal is applied.

FIG. 9 shows details of the focus control section 16. A focus error detection circuit 90 obtains a focus error signal 90s from a signal related to focus control in the output signal 14s of the preamplifier, and a focus drive circuit 92 obtains a focus control signal 16s via a focus compensation circuit 91. Based on this, the voice coil 15 of the optical pickup 3 is driven, and focus control is performed.

The offset compensating circuit 91 has a structure capable of setting a plurality of offset levels according to a signal from the outside. The offset input to the offset compensating circuit 91 is an offset setter 93 that sets an offset when tracking to a land, an offset setter 94 when tracking to a groove, and a half-track jump from land to groove or groove to land. It is generated in the offset setter 95 that sets the offset in the track jump operation.

The offset selector 96 corresponds to the output 7s of the L / G selection system 7 and the offset setter 93,
One of the signals 94 is output. Further, the offset selector 96 indicates that the system controller has instructed to perform a half-track jump.
Is input to the output level of the offset setter 95.

The offset setting of the half track jump is used to stabilize the operation before and after the track jump when the level difference between the offset setters 93 and 94 is extremely large, and when the level difference is small. Can be omitted.

On the other hand, the focus drive circuit 92 outputs the signal 16s that cancels the input signal 91s to zero, and drives the voice coil 15. The gain used for the focus drive circuit 92 is generated in the gain setter 97 that sets the gain when tracking the land and the gain setter 98 that sets the gain when tracking the groove. In the gain selector 99, L
In response to the output 7s of the / G selection system 7, either one of the gain setting devices 97 and 98 is output. With the above configuration, it is possible to set the optimum focus state for both the land and the groove.

Regarding the tracking control as well, if the optimum state is set for the land and the groove, more satisfactory recording and reproduction can be performed. FIG. 10 shows details of the tracking control unit 17. The tracking error signal 100s is obtained by the tracking error detection circuit 100 from the signal relating to the tracking control in the output signal 14s of the preamplifier, the focus control signal 17s is obtained by the tracking drive circuit 102 through the tracking compensation circuit 101, and the polarity reversing device is obtained. Tracking control is performed by driving the voice coil 15 of the optical pickup via 18.

The tracking compensation circuit 101 has a structure capable of setting a plurality of offset levels according to a signal from the outside. The offset input to the tracking compensation circuit 101 is an offset setter 103 that sets an offset when tracking a land, and an offset setter 10 when tracking a groove.
4. It occurs in the offset setter 105 that sets the offset in the half track jump operation of track jump from land to groove or from groove to land.

The offset selector 106 corresponds to the output 7s of the L / G selection system 7 and corresponds to the offset setter 10 described above.
Either the signal 3 or 104 is output. In addition, the system control unit sends an instruction for a half-track jump to the offset device 1.
If it is input to 06, it becomes the output level of the offset setter 105.

The offset setting of the half track jump is used to stabilize the operation before and after the track jump when the level difference between the offset setters 103 and 104 is extremely large, and when the level difference is small. Can be omitted.

On the other hand, the tracking drive circuit 102 cancels the input signal 101s to make the signal 17 zero.
s is output to drive the voice coil 15. The gain used in the tracking drive circuit 102 is a gain setter 10 that sets a gain when tracking is performed on a land.
This occurs in the gain setter 108 when tracking to 7 and the groove. In the gain selection circuit, L / G
Corresponding to the output 7s of the selection system 7, either of the signals of the offset setting devices 107 and 108 is output. With the above configuration, it is possible to set the optimum tracking state for both the land and the groove.

Further, in order to set the optimum focus condition or tracking condition, recording / reproducing is performed stepwise by changing the servo condition before the signal recording / reproducing as in the trial recording shown in the first embodiment. May be. For this step, a procedure similar to the trial writing step described with reference to FIG. 8 can be used.

When setting the focus condition, as shown in FIG. 9, the system control signal 8s is supplied to the offset setters 93, 94 and 95 via the focus condition setter 141.
And the gain setters 97 and 98. As shown in FIG. 11, according to the instruction of the test reproduction start 111, the light beam is moved 112 to the test zone on the optical disk, the track on which the reference recording mark is recorded is scanned in advance, and the reproduction of the signal is started.

Then, in the servo condition setting step 113, one focus offset and one focus gain are set based on the signal from the focus condition setting device 141, and then the error rate detection step 114 demodulates the signal to obtain an error. Rate the rate. Further, the focus condition setter 1 is checked in the existence confirmation step 115 of the servo condition.
The servo condition next to 41 is confirmed. If there are remaining setting conditions that have not yet been executed, the servo condition setting step 113 is repeatedly executed to execute all the setting conditions. The obtained results are compared in the error rate comparison step 116 to determine the optimum focus condition.

As for the tracking condition, as shown in FIG. 10, the system control signal 8s is sent to the offset setting devices 103, 104, 1 via the tracking condition setting device 142.
05 and the gain setters 107 and 108, and
Optimal tracking conditions are determined by the procedure shown in FIG.

Further, although the method of reproducing the reference recording mark previously recorded in the test area is shown here, the trial recording is performed in the state where the focusing condition or the tracking condition is changed by the same method as described above. By demodulating the reproduction signal from each recording mark, the servo condition at the time of recording can be obtained. In this case, a light irradiation step for recording may be added between the servo condition setting step 113 and the error rate detecting step 114.

The optimum servo condition at the time of recording thus obtained and the optimum condition at the time of reproduction often have slightly different values. In order to deal with this, either value is adopted as necessary, or the servo state is switched between recording and reproduction. With the above configuration, it is possible to perform recording on the land and the groove in response to variations between discs or in the recording / reproducing apparatus.

(Embodiment 3) Here, the step of switching the recording condition between the land and the groove at the time of recording is omitted or simplified, and an information signal is generated based on the reflected light of the light beam applied to the optical information recording medium. An example of a method of switching the demodulation condition between the land and the groove when demodulating will be described. Here, it is intended to correct the signal amplitude difference and the difference in the mark length dependency of the signal amplitude among the differences generated between the land and the groove of the reproduction signal. Note that the mark length dependency of the signal amplitude means an amplitude ratio generated between the shortest recording mark and the longest recording mark among the recording marks formed corresponding to the information signal.

FIG. 12 shows details of the binarization unit 20. The high band pass filter (HPF) 120 outputs the high frequency component of the output signal 14s of the preamplifier, and the equalizing circuit 121 further amplifies the signal of the high frequency component in the signal band of the input signal and outputs it as the signal 121s. The signal 121s is input to the decoder 21 as a binarized signal 20s via the comparator circuit 122 and the phase compensation circuit 129, and the information signal is demodulated. Further, the binarized signal 20s is converted into the L / G condition discriminator 2 as shown in FIG.
Input to 2 and monitor the playback status.

The equalizing circuit 121 has a structure in which equalizing characteristics such as a frequency band and gain of equalizing can be arbitrarily set according to an external signal. In the equalizing circuit 121, a gain setter 123 that sets a gain when tracking to a land,
A gain setter 114, which sets the gain when tracking to the groove, is connected via a gain selector 125. The gain selector 125 is the L / G selection system 7
One of the values set by the gain setters 123 and 124 is output to the equalizing circuit 121 based on the output 7s of. The equalizing circuit 121 equalizes the signal that has passed through the high band pass filter 120 based on the set gain received by the gain selector 125, and outputs the signal 1
It is output as 21s.

The comparator circuit 122 outputs the signal 121s
Is compared with a reference level, and the obtained binarized signal is output to the phase compensation circuit 129. The phase compensation circuit 129 compensates the phase of the binarized signal and outputs the phase-compensated binarized signal 20.
Output as s. The slice level which is the reference level of the comparator circuit 122 is set by the level setter 126 that sets the level when tracking the land and the level setter 127 that sets the level when tracking the groove.

The level selector 128 outputs the set value of one of the level setters 126 and 127 to the comparator circuit 122 based on the output 7s of the L / G selection system 7, and gives the reference level to the comparator 122.

With the above configuration, the reproduction signal is set to the optimum slice level 2 for both the land and the groove.
Quantify. By performing signal processing on the information signals recorded on the lands and the grooves under mutually independent conditions, it is possible to reduce the difference in recording characteristics caused by the lands and the grooves.

Further, as a method for setting the optimum equalizing condition or slice condition, it is effective to provide a reproducing condition setting step for predetermining the reproducing condition as in the trial writing of the first embodiment. This step can use a procedure similar to the trial writing step described with reference to FIG. 8, but when setting the reproduction condition, the system control signal 8s is set to the reproduction condition setting unit 143 as shown in FIG. Via the gain setters 123 and 124 and the level setter 12
6 and 127.

As shown in FIG. 13, the test reproduction start 13
According to the instruction 1, the light beam is moved to the test area on the optical disk, the track on which the reference recording mark is recorded is scanned, and the reproduction of the signal is started. Then, in the reproduction condition setting step 133, one equalizing characteristic and one slice level are set based on the signal from the reproduction condition setting device 143, and then the error rate detection step 134 demodulates the signal to evaluate the error rate. . Further, in the reproduction condition existence confirmation step 135, the reproduction condition setting unit 14
Check the regeneration conditions following the number 3. In the case where there are still remaining set-up and reproduction conditions that have not been executed yet, the reproduction condition setting step 1
33 is repeated and all the setting conditions are executed.
The obtained results are compared in the error rate comparison step 136 to determine the optimum reproduction condition.

With the above configuration, it is possible to reproduce the signals recorded in the lands and the grooves in response to the variation between the disks or in the recording / reproducing apparatus. Further, by providing the recording condition setting step shown in the first and second embodiments before this reproducing condition setting step, the quality of the recording / reproducing apparatus can be further improved.

Although the recording medium was not described in detail in Examples 1 to 3, the present invention can be applied to all recording media having an optically detectable recording state. Further, the groove depth, which is the shape parameter of the groove, the angle of the slope area of the boundary between the land and the groove, and the like have not been described in detail, but these are not the restrictions of the present invention.

The present invention relates to a light modulation system in the first embodiment, and a second embodiment.
The method of compensating for the characteristic difference between the land and the groove separated from the control system and the signal reproducing system in the third embodiment has been described. Accordingly, it is obvious that the above conditions can be combined or simplified and applied.

[0111]

According to the present invention, since the recording condition is changed depending on which of the concave portion and the convex portion of the guide groove is tracked, the recording which compensates the heating / cooling characteristic at the time of recording occurring between the groove and the land. Therefore, information can be recorded stably.

Further, it is possible to independently compensate for the focus and tracking error caused by the difference in tracking the concave portion and the convex portion of the guide groove and the distortion of the reproduced signal generated at the time of signal demodulation. Therefore, according to the present invention, it is possible to obtain an optical recording / reproducing apparatus with little reading error in both the land and the groove of the guide groove.

Further, by providing the characteristic identifier, it is possible to compensate for individual differences, and an optical recording medium with few reading errors can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical information recording / reproducing apparatus of the present invention.

FIG. 2 is a partial configuration diagram of an optical information recording medium of the present invention.

FIG. 3 is a block diagram showing a configuration of a waveform setting unit according to the first embodiment.

FIG. 4 is a signal waveform diagram of the pattern setter of the first embodiment, (a) is a signal waveform diagram when recording on a land, and (b) is a signal waveform diagram when recording on a groove.

FIG. 5 is a diagram of a signal waveform and a recording state of the waveform setting device of the first embodiment.

FIG. 6 is a configuration diagram of an optical information recording medium according to a first embodiment.

FIG. 7 is a signal waveform diagram of the recording condition setting device of the first embodiment.

FIG. 8 is a flowchart of recording condition setting according to the first embodiment.

FIG. 9 is a block diagram showing a configuration of a focus control unit according to a second embodiment.

FIG. 10 is a block diagram showing the configuration of a tracking control unit according to a second embodiment.

FIG. 11 is a flowchart of servo condition setting according to the second embodiment.

FIG. 12 is a block diagram showing a configuration of a binarizing unit according to a third embodiment.

FIG. 13 is a flowchart of reproduction condition setting according to the third embodiment.

[Explanation of symbols]

 1 optical disk 2 motor 3 optical pickup 4 optical modulation system 5 control system 6 signal reproduction system 7 L / G selection system 8 system control system 9 rotation control 10 laser drive unit 11 light source 12 objective lens 13 photodetector 14 preamplifier 15 voice coil 16 Focus control unit 17 Tracking control unit 18 Polarity inverter 19 Jumping circuit 20 Binarization unit 21 Decoder 22 LG condition recognizer 23 Encoder

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Akabira 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (19)

[Claims] 1. A recording medium provided with a recording thin film which produces a change which can be optically detected by irradiation of light on a substrate having a guide groove composed of a concave portion and a convex portion. Is an optical information recording / reproducing apparatus for recording / reproducing an information signal, the optical means having a light source, and condensing a light beam emitted from the light source onto the recording medium using an objective lens; Focus control means for controlling the condensing position of the beam and the position of the recording thin film, and tracking control means for controlling the light beam position in the substantially vertical direction of the guide groove to follow the light beam in the guide groove. And a selecting means for selecting which of the concave portion and the convex portion of the guide groove is to be used for recording the information signal or reproducing the recorded information signal, and according to the selection result of the selecting means, Tracking control hand Polarity inversion means for inverting the polarity of the output signal, waveform setting means for setting the modulation pattern of the light beam applied to the recording medium according to the information signal, and recording recorded on the recording medium. Signal reproduction means for demodulating an information signal from reflected light or transmitted light from the mark, and at least one of the focus control means, the tracking control means, the waveform setting means, and the signal reproduction means, An optical recording / reproducing apparatus comprising two or more kinds of operating conditions for recording / reproducing an information signal in a concave portion and a convex portion of a groove, and the operating condition is selected according to a selection result of the selecting means. 2. A recording medium provided with a recording thin film which produces a change which can be optically detected by irradiation of light on a substrate having a guide groove consisting of a concave portion and a convex portion. Is an optical information recording / reproducing apparatus for recording / reproducing an information signal, the optical means having a light source, and condensing a light beam emitted from the light source onto the recording medium using an objective lens; Focus control means for controlling the condensing position of the beam and the position of the recording thin film, and tracking control means for controlling the light beam position in the substantially vertical direction of the guide groove to follow the light beam in the guide groove. And a selecting means for selecting which of the concave portion and the convex portion of the guide groove is to be used for recording the information signal or reproducing the recorded information signal, and according to the selection result of the selecting means, Tracking control hand At least 2 of the polarity and the polarity inverting means for inverting the output signal, conforming to the information signal, recording the information signal to each of the concave and convex portions of the guide grooves
A light having a plurality of types of modulation patterns, having waveform setting means for outputting any one of the modulation patterns according to the selection result of the selecting means, and modulating the intensity of the light beam according to the modulation pattern of the waveform setting means. An optical recording / reproducing apparatus equipped with a modulation means. 3. The waveform setting means records on a recording medium 1
It is provided with a multi-pulse modulation function for irradiating each recording mark with light composed of a plurality of pulse trains, and the waveforms of the plurality of pulse trains differ between two or more types of modulation patterns provided in the waveform setting means. The optical recording / reproducing apparatus according to claim 1, which is characterized in that. 4. The optical recording / reproducing apparatus according to claim 1, wherein the two or more types of modulation patterns of the waveform setting means change the power of the light beam. 5. A recording / reproducing apparatus is provided with a signal reproducing means for demodulating an information signal from reflected light or transmitted light from a recording mark recorded on a recording medium, and the waveform setting means has an information signal on the recording medium. Recording condition setting means for storing a plurality of pulse patterns for irradiating the concave and / or convex portions of the guide groove with light beams having different modulation patterns in a region close to the information recording region on the recording medium before recording Information obtained by irradiating a light beam modulated according to the plurality of pulse patterns by the light modulating means to form a plurality of recording marks on the recording medium and irradiating the light beam. A signal is demodulated by the signal reproducing means,
3. The optical recording / reproducing according to claim 2, wherein qualities of a plurality of reproduced signals obtained by the signal reproducing means are compared to determine optimum recording conditions for the concave and convex portions of the guide groove. apparatus. 6. A recording condition recognition means for reading a recording condition identifier for correcting a characteristic difference between a concave portion and a convex portion of the guide groove is provided in a specific area outside the information recording area of the recording medium,
3. The optical recording / reproducing apparatus according to claim 1, wherein the recording condition recognition means operates the optical means based on the read information. 7. A recording medium provided with a recording thin film on a substrate having a guide groove formed of a concave portion and a convex portion, the change being optically detectable by irradiation of light, both the concave portion and the convex portion of the guide groove. In an optical information recording / reproducing apparatus for recording / reproducing an information signal, which of the concave portion and the convex portion of the guide groove is to be used for recording the information signal or reproducing the recorded information signal? At least with respect to the concave portion and the convex portion of the guide groove, and the selecting means for selecting, the optical means having a light source, and condensing the light beam emitted from the light source on the recording medium by using the objective lens. An offset setting means for giving offsets of two or more levels is provided, and the offset selected according to the selection result of the selecting means is used to control the converging position of the light beam and the position of the recording thin film. Focus control means A tracking control means for controlling the light beam position in the substantially vertical direction of the guide groove to follow the light beam in the guide groove, and a polarity for inverting the polarity of the output signal of the tracking control means according to the selection result of the selecting means. An optical recording / reproducing apparatus having an inverting means. 8. A recording / reproducing apparatus includes signal reproducing means for demodulating an information signal from reflected light or transmitted light from a recording mark recorded on a recording medium, and a focusing means records and reproduces a reference signal. A focus condition setting unit that stores the offset level, and uses the plurality of offset levels in an area close to the information recording area on the recording medium before recording and reproducing the information signal on the recording medium,
A plurality of recording marks are formed by irradiating a concave portion and / or a convex portion of a guide groove with a light beam, and a reproduction signal obtained from the plurality of recording marks is demodulated by the signal reproducing means using the light beam, and the signal is reproduced. 8. An optical recording / reproducing apparatus according to claim 7, wherein the qualities of a plurality of reproduced signals obtained by the reproducing means are compared to determine the optimum offset level for the concave portion and the convex portion of the guide groove. 9. A recording / reproducing apparatus includes signal reproducing means for demodulating an information signal from reflected light or transmitted light from a recording mark recorded on the recording medium, and the focusing means comprises:
Having a focus condition setting unit that stores a plurality of offset levels, before recording and reproducing an information signal on the recording medium, a reference recording mark prerecorded in an area close to the information recording area on the recording medium, Irradiating the light beam using the plurality of offset levels, demodulating the reference signal obtained from the reference recording mark by the signal reproducing means, and comparing the qualities of the plurality of reproduced signals obtained by the signal reproducing means. 9. The optical recording / reproducing apparatus according to claim 7, wherein an optimum offset level is determined for the concave portion and the convex portion of the guide groove. 10. A jump means for interlocking with the operation of the polarity reversing means, for moving the half-track spectral beam from the concave portion of the recording medium to the adjacent convex track or from the convex portion to the adjacent concave track, 9. The optical recording according to claim 7, wherein when the jump means is in operation, the offset is an intermediate value between the offsets of the focus means set for the concave portion and the convex portion of the recording medium. Playback device. 11. The tracking control means is at least two.
8. The optical recording according to claim 7, further comprising a second offset setting means for giving an offset of one or more levels, and switching the offset level of the second offset setting means according to the selection result of the selection means. Playback device. 12. A recording medium having a recording thin film, which has a recording thin film which is optically detectable by irradiation of light on a substrate having a guide groove composed of a concave portion and a convex portion, and both the concave portion and the convex portion of the guide groove. Is an optical information recording / reproducing apparatus for recording / reproducing an information signal, the optical means having a light source, and condensing a light beam emitted from the light source onto the recording medium using an objective lens; Focus control means for controlling the condensing position of the beam and the position of the recording thin film, and tracking control means for controlling the light beam position in the substantially vertical direction of the guide groove to follow the light beam in the guide groove. And recording of the information signal or reproduction of the recorded information signal,
The selecting means for selecting which of the concave portion and the convex portion of the guide groove should be used, the polarity inverting means for inverting the polarity of the output signal of the tracking control means according to the selection result of the selecting means, and the recording. At least two or more demodulations for demodulating the information signal from the reflected light or transmitted light from the recording mark recorded on the medium according to the selection result of the selecting means to the information signal of the concave portion and the convex portion of the guide groove. An optical recording / reproducing apparatus comprising a signal reproducing means for switching conditions. 13. The optical recording / reproducing apparatus according to claim 12, wherein at least two or more demodulation conditions are equalization conditions having different amplification characteristics with respect to frequency. 14. The signal reproducing means comprises at least two or more level setters for generating reference signals of different levels, and a comparator for comparing the reference signals with an information signal from a recording medium, and at least two. The above demodulation conditions are 2
13. The optical recording / reproducing apparatus according to claim 12, wherein the optical recording / reproducing device is the reference signal for digitizing. 15. A reference recording mark, which is provided in a specific area outside the information recording area of the recording thin film and is previously recorded in the concave and convex portions of the guide groove, is reproduced before demodulating the information signal from the recording medium. 13. The optical recording / reproducing apparatus according to claim 12, wherein the demodulating conditions of the signal reproducing means are changed stepwise for demodulation, and the demodulated demodulated signals are compared to determine an optimum demodulating condition. . 16. A substrate having a guide groove composed of a concave portion and a convex portion, a recording thin film provided on the substrate to cause a change that can be optically detected by irradiation of light, and a portion outside the information recording area of the recording thin film. An optical information recording medium having, in a specific area, a land / groove identifier that indicates a difference in characteristics caused by a concave portion and a convex portion of the guide groove. 17. The optical information recording medium according to claim 16, wherein the land / groove identifier includes information indicating a light irradiation condition at the time of recording. 18. The optical information recording medium according to claim 16, wherein the land / groove identifier comprises an identifier consisting of information on the groove shapes of the concave portion and the convex portion of the guide groove. 19. A land / groove identifier is an area adjacent to each other on the same plane of an information recording area of a recording medium, which is provided in a concave portion and a convex portion of a guide groove, and represents the information signal recorded in the information recording area. The optical information recording medium according to claim 16, which is a reference recording mark that determines a reproduction condition.