JP2005182911A - Optical information recording/reproducing apparatus and optical information recording/collating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information recording/reproducing apparatus and an optical information recording/collating method, which allow high speed recording/collating operation so that the collation of the recorded information is successively carrying out with the slight time difference immediately after the recording. <P>SOLUTION: This apparatus is equipped with a 1st laser diode 31 for recording data on an optical disk 11 and a 2nd laser diode 32 for reading out the data recorded on the optical disk, which is placed adjacent to the 1st laser diode 31 and so that an oscillation optical axis becomes parallel, and a track top is irradiated by the 1st laser diode 31 and the 2nd laser diode 32, and these diodes are arranged so that the position of the track top at the side to be recorded after a series of the recording operation is irradiated by the 1st laser diode 31, and the position on the track at the side firstly recorded is irradiated by the 2nd laser diode 32, then, emissions of the 1st and 2nd laser diodes 31, 32 are individually controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical information recording / reproducing apparatus and an optical information recording / collating method, and more particularly to an optical information recording / reproducing apparatus and an optical information for collating the recorded information with the original information after recording the information on an optical disk or a magneto-optical disk. The present invention relates to a record verification method.

  In recent years, there has been a demand for an increase in capacity of an information recording medium and a higher speed of recording on the information recording medium.

  Increasing the capacity of information recording media is accompanied by an increase in recording and reproduction speed. In order to increase the capacity, that is, to improve the recording density, in the optical disc, from CD (Compact Disc) to DVD (Digital Versatile Disc), in the magneto-optical disc, the recording density of MO (Magneto-Optical Disc) is improved. The transition is seen. This is in line with the technological development of a laser diode whose emission wavelength has been shortened from infrared light to red, and the development of a blue-violet laser diode with a shorter wavelength is underway.

  Each optical disc, such as a CD or DVD, starts from a read-only ROM (Read Only Memory), and includes a light source as a light source, a laser diode with a large light output, an additionally recordable organic dye type disc, and a recordable and erasable phase change type disc. An optical information recording / reproducing apparatus (hereinafter referred to as an optical information recording / reproducing apparatus) using these optical discs as recording media has been developed. As the optical output increases, the time for heating the recording surface of the optical disk to a constant temperature is shortened, and the speed of information recording is increased.

  When data is recorded on such a write-once or rewritable optical disk or magneto-optical disk, read after write is performed to check whether the data is correctly recorded. For example, in the case of an optical disc, when correct data cannot be read, this sector area is determined as a defective sector area, and data recorded in this defective sector area is recorded in a preset replacement sector area. .

  An optical disc has, for example, a format having a spiral (spiral) track, a plurality of sector areas having a predetermined track length, and a block area having a collection of these sector areas.

  Then, a sector having an initial defect at the time of manufacture is skipped in units of sectors and data is recorded in another sector, and a predetermined number of blocks among a plurality of blocks are blocks including sectors having a secondary defect at the time of data recording. A method is disclosed in which a block including a sector having a secondary defect is replaced with the replacement block on a block basis (see, for example, Patent Document 1). Here, after one unit (block) is recorded using one laser diode, verification (verification) is performed.

  During recording, the injection current is increased to increase the optical output of the laser diode, and the recording layer on the surface of the optical disk is heated to the required temperature, causing a phase change on the surface of the recording layer, for example, Write. During reproduction, the laser diode injection current is lowered to reduce the optical output, and the reflected light from the recording layer is received by the light receiving element to read the data.

At the time of collation, since the recorded data is read out and collated with the original data, for example, after recording of one sector or one block, the sector or block is reproduced and the original data is reproduced. A verification process is performed. That is, as long as recording and verification are performed using one laser diode, it is necessary to perform irradiation twice in total, once in the recording mode and once in the verification mode. However, there is a problem that it becomes an obstacle to high-speed record collation.
JP-A-9-259547 (page 9, FIG. 18)

  As described above, when recording on a recording medium, using a single laser diode and reproducing and collating after recording of one unit, it takes time to add the recording time and the collation time. There was a problem of becoming.

  Accordingly, an object of the present invention is to provide an optical information recording / reproducing apparatus and an optical information recording / collating method capable of high-speed recording collation that can sequentially execute collation of recorded information with a slight time difference immediately after recording. And

  In order to achieve the above object, an optical information recording / reproducing apparatus according to an aspect of the present invention has a spiral track on which data is recorded, and a format having a sector area or a block area including a data area is defined. An optical information recording / reproducing device for an information recording medium, the first laser diode for recording data on the information recording medium, and an oscillation optical axis adjacent to the first laser diode and parallel to each other A second laser diode that reads data recorded on the information recording medium placed thereon, the first laser diode and the second laser diode irradiate a track, and the first laser diode Irradiates a position on the track to be recorded later in a series of recording operations, and the second laser diode is tracked on the track to be recorded first. It arranged to illuminate the position of the upper, light emission of the first and second laser diodes are being controlled individually.

  An optical information recording / collating method according to another aspect of the present invention provides an optical information recording medium having a spiral track on which data is recorded and a format having a sector area or a block area including a data area. An information recording collation method comprising: preparing a first data based on a recording instruction; and recording the first data onto the information recording medium using a first laser diode. And after the recording by the first laser diode, before the information recording medium makes one rotation, the second data is irradiated with a second laser diode and read, and the read first And a step of collating the second data with the first data.

  According to the present invention, it is possible to provide an optical information recording / reproducing apparatus and an optical information recording collation method capable of high-speed recording collation that can be performed sequentially with a slight time difference immediately after recording. .

  Embodiments of the present invention will be described below with reference to the drawings. In each figure, the same component is denoted by the same reference numeral.

  An optical information recording / reproducing apparatus and an optical information recording collating method according to an embodiment will be described with reference to FIGS.

  FIG. 1 is a block diagram schematically showing a configuration of an optical information recording / reproducing apparatus using an optical method, and FIG. 2 is a block diagram schematically showing an optical head which is a main part of the optical information recording / reproducing apparatus. FIG. 3 is a perspective view of an integrated laser which is a main part of the optical head with a part of the envelope cut out, and FIG. 4 is a perspective view showing an LD chip in which two laser diodes (hereinafter referred to as LDs) are monolithically integrated. FIGS. 5 and 6 are flowcharts showing operations for recording and verifying information (hereinafter referred to as data), and FIG. 6 is a schematic diagram showing an enlarged recording mark and two LD irradiation portions recorded on the recording layer of the optical disc. FIG. 7 is a time chart comparing the optical output in the recording process and the collating process performed using two LDs with the case where one LD is used.

  As shown in FIG. 1, an optical disc apparatus 1 that is an optical information recording / reproducing apparatus is an apparatus that irradiates an optical disc 11 with LD light to record data or reproduce recorded data.

  The optical disk apparatus 1 includes a spindle motor 12 that rotates an optical disk 11, an optical head 13 that irradiates the optical disk 11 with LD light and detects reflected light, an LD controller 14 that drives the LD, a modulator 15 that generates data, and a recording A data collating unit 16 for collating data, a demodulating unit 17 for reproducing data, a servo control unit 18 for driving and controlling operations of the spindle motor 12 and the optical head 13, a controller 21 having a CPU, a memory, etc., a host computer ( This is a configuration having an interface 22 serving as a window for a not-shown) or the like.

  The optical disk 11 is, for example, a DVD-RAM (Random Access Memory) disk, and tracks are formed in a spiral shape. The optical disk 11 is composed of three parts, a lead-in area, a data area, and a lead-out area, from the inner peripheral side. The data area is further divided into a plurality of zones composed of a plurality of track portions, and the clock wave value increases from the inner circumference toward the outer circumference for each zone. One zone is composed of a plurality of sectors. For example, the number of zones is 35, the innermost zone is 25, and the outermost zone is composed of 59 sectors. One sector length is 2697 bytes, and main data having a data length of 2048 bytes is converted and stored in a form suitable for the recording format. When data is read, for example, it is read as one block (16 sectors).

  The optical disk 11 is rotated by a spindle motor 12 during recording or reproduction, and rotation driving and control are performed by a servo control unit 18.

  The optical head 13 is composed of a first LD 31 which is a first laser diode for recording and a second laser diode for reproduction in order to irradiate recording or reproducing LD light toward the recording layer of the optical disc 11. A certain second LD 32 is mounted. The first and second LDs 31 and 32 are arranged to irradiate the track at the same time, but are driven and controlled separately by the LD control unit 14.

  The optical head 13 includes a light receiving PDIC 39 including a light receiving element and an amplification circuit for detecting and amplifying light irradiated from the second LD 32 for reproduction and reflected on the recording layer of the optical disk 11. The detection signal is output to the data collating unit 16, the demodulating unit 17, or the servo control unit 18.

  The LD control unit 14 controls the light intensity of the first LD 31 irradiated from the optical head 13 to the optical disc 11 during recording in accordance with the recording signal from the modulation unit 15, and irradiates the optical disc 11 from the optical head 13 during reproduction. Control is performed so that the second LD 32 light has a constant level.

  For example, the modulation unit 15 converts data to be recorded stored in a buffer memory (not shown) or the like so as to be suitable for the recording format, and outputs the data to the LD control unit 14.

  The servo control unit 18 generates a rotation servo signal, a thread control signal, a tracking servo signal, and a focus servo signal based on the detection signal from the light receiving PDIC 39. The rotation servo signal is supplied to a motor driver (not shown) in the servo control unit 18, and the spindle motor 12 is controlled based on this signal.

  The thread control signal, the tracking servo signal, and the focus servo signal are supplied to, for example, a motor driver (not shown) in the servo control unit 18, and the motor driver moves the optical head 13 in the radial direction of the optical disk 11 by the thread control signal. The optical head 13 is moved in the radial direction by the tracking servo signal. By this operation, so-called tracking control is performed in which the LD light irradiated from the optical head 13 to the optical disk 11 follows the track.

  The motor driver in the servo control unit 18 swings the optical head 13 in a direction perpendicular to the optical disk 11 based on the focus servo signal. As a result, so-called focus control is performed in which the LD light irradiated from the optical head 13 onto the recording layer of the optical disk 11 is focused on the optical disk 11.

  The data collation unit 16 collates the detection signal from the light receiving PDIC 39 with the signal output from the modulation unit 15 in order to verify whether or not the data written on the optical disc 11 is accurately recorded. Based on this result, for example, an instruction is issued from the controller 21, and a process for replacing the defective sector or defective block with a replacement sector or replacement block is performed.

  The demodulator 17 demodulates the detection signal from the light receiving PDIC 39 to obtain reproduced data. The reproduction data demodulated by the demodulator 17 is stored in a buffer memory (not shown) in the controller 21, for example. The reproduced data is subjected to error correction based on the added parity data.

  The error-corrected reproduction data is output from the controller 21 to the host computer (not shown) through the interface 22, and data for recording from the outside is input to the controller 21 through the interface 22.

  Next, in particular, the optical head 13 will be described in detail with respect to the optical system and the LD used therein.

  As shown in FIG. 2, the optical head 13 suitably uses LD light having a large light output for recording, for example, several tens of mW, and LD light having a small light output for reproduction, for example, several mW. This is an apparatus for irradiating the recording layer of the optical disc 11.

  An integrated laser 5 in which a first LD 31 capable of large light output and a second LD 32 of small light output are embedded in a metal envelope close to each other so that the oscillation optical axis is parallel, and a collimator lens that converts light into parallel light beams 36, a beam splitter 35 that separates light into transmitted light and reflected light, light reflected by the beam splitter 35 travels toward the optical disc 11, and is reflected from the objective lens 37 and the surface of the optical disc 11 for collecting the light. The light receiving PDIC 39 collects the incoming light with the condenser lens 38 and detects and amplifies it, and the first monitor PD 34 for controlling the light output of the first LD 31.

  The first LD 31 and the second LD 32 are formed, for example, with a light emitting point interval of 110 μm apart. The first LD light 41 and the second LD light 42 from these pass through one collimator lens 36 and one beam splitter 35 and irradiate the track on the optical disk 11 using one objective lens 37 in common. The distance between the first LD irradiation unit 51 and the second LD irradiation unit 52 on the recording layer on the track is the shortest. The first and second LD lights 41 and 42 are bent 90 degrees at the reflection surface of the beam splitter 35.

  Since the track is spiral but very close to a concentric circle, the line segment connecting the first LD irradiation unit 51 and the second LD irradiation unit 52 is on the recording layer of the optical disc 11, and the vertical line segment of the line segment is 2 etc. If the dividing line is placed in a positional relationship that passes through the center of rotation of the optical disc 11, both irradiation units are on the track.

  The first LD 31 irradiates the rear side with respect to the rotation direction of the optical disc 11, and the second LD 32 is arranged in a positional relationship to irradiate the front side of the rotation direction of the optical disc 11. That is, when the optical disc 11 is rotating, the first LD 31 irradiates the same portion of the optical disc 11 first, and then the second LD 32 installed at a certain distance is irradiated.

  The first monitor PD 34 is installed by moving the light receiving portion of the first monitor PD 34 upward in the drawing so as to receive only the LD light of the first LD 31 without receiving the LD light from the second LD 32. The light receiving PDIC 39 is installed by moving the light receiving portion of the light receiving PDIC 39 in the left direction of the drawing so as to receive only the LD light of the second LD 32 without receiving the LD light from the first LD 31 reflected from the optical disk 11. It is. The distances to be moved are distances in consideration of the spread of the LD light in the interval between the light emitting points of the first LD 31 and the second LD 32.

  Further, the first monitor PD 34 is inclined by giving an inclination of several degrees from a position perpendicular to the incident direction in order to prevent the incident LD light from being reflected and returned in the incident direction.

  Next, as shown in FIG. 3, the integrated laser 5 has a structure in which the LD chip 30 composed of the first LD 31 and the second LD 32 arranged close to each other is placed inside an envelope composed of a stem 46 and a cap 47. It is. The integrated laser 5 includes a metal stem 46 in which three of the four lead pins 33 are electrically insulated, and a first stem for monitoring the LD light of the LD chip 30 and the second LD 32. 2 Monitor PD40 is fixed.

  The LD chip 30 is mounted on an insulating submount 45 with good heat dissipation, and is fixed perpendicular to the stem 46 so as to emit LD light on the opposite side of the stem 46. Further, the second monitor PD 40 is fixed to the stem 46 so as to receive one radiated light of the LD chip 30. The LD chip 30 and the second monitor PD 40 are electrically connected to the leads 33 by Au wires.

  The metallic cap 47 is sealed to the metallic stem 46. A window glass 48 for extracting laser light is provided on the top of the cap 47, and the first and second LD lights 41 and 42 from the LD chip 30 are externally passed through the window glass 48 from one end face of the LD chip 30. Radiated toward the outside of the enclosure. On the other end face, the LD light from the second LD 32 enters the second monitor PD 40 for controlling light emission, but the LD light from the first LD 31 is blocked by a convex portion (not shown) provided on the stem 46. Almost 100%.

  As shown in FIG. 4, the LD chip 30 includes first and second LDs 31 and 32 made of InGaAlP that oscillate red LD light having a wavelength of 650 nm, which are monolithically formed on the same semiconductor substrate. The structure is juxtaposed. In addition, although LD light is radiated | emitted from the both end surfaces of LD chip | tip 30, only the radiation | emission from one end surface is shown in FIG. Further, the light-emitting point interval between the first and second LDs 31 and 32 is 110 μm as described above, and the first and second LDs 31 and 32 are electrically separated by the separation groove 43, and each is independent. And can be driven.

  The LD chip 30 is manufactured on a single semiconductor substrate by a semiconductor manufacturing process. Therefore, the interval between the first and second LDs 31 and 32 is determined by mask alignment, crystal growth, other processing accuracy, etc. in the semiconductor manufacturing process, and as a result, the light emitting point interval or the parallelism of the LD oscillation optical axis is also determined. It is possible to emit parallel LD light with high accuracy to such an extent that variations are almost negligible. Therefore, it is possible to irradiate the first and second LD lights 41 and 42 onto the track with high accuracy.

  Next, a process of writing data to be recorded on the optical disk 11 using the optical disk device 1 described above and checking whether the written data is correct will be described.

  As shown in FIG. 5, for example, the DVD-RAM optical disk apparatus 1 receives a recording instruction input from the outside through the interface 22 (step S11).

  Based on this instruction, data to be recorded on the optical disk 11 is taken into, for example, a buffer memory (step S12).

  The data taken into the buffer memory is converted into a data recording format suitable for DVD-RAM (step S13).

  The converted data (first data) is output to the LD control unit 14 (step S14).

  The optical head 13 moves to a predetermined position on the optical disk 11 and is subjected to focus adjustment, and at the same time, the LD control unit 14 converts the data for optical output of the first LD 31 for recording and drives the LD. Thus, for example, the GeSbTe recording layer formed on the surface of the optical disc 11 is urged to emit radiation from the first LD 31. When the irradiated recording layer changes to an amorphous phase or a crystalline phase, binarized data (second data) having different reflectivities is formed, and this is recorded (step S15).

  On the other hand, the second LD 32 for reproduction / collation is controlled to irradiate with a constant light output from the LD control unit 14 and irradiates a predetermined position of the optical disc 11. Since the interval between the first LD 31 and the second LD 32 is set to 110 μm between the emission points of the integrated laser 5 described above, the second LD 32 is delayed by about 110 μm and sequentially irradiates the track immediately after recording by the first LD 31. The data is read (step S16).

  The read data (second data) is collated with the original data (first data) stored in the buffer memory or the like called from the modulation unit 15 (step S17).

  If the read data is correct, it is confirmed whether or not data to be recorded remains (step S19). Steps S14 to S19 are repeated until there is no data to be recorded, writing is performed, and the process ends when there is no more data to be recorded.

  On the other hand, if the read data is not correct, the sector or block being written is designated as a defective sector or defective block, and a replacement process for writing into the replacement sector or replacement block is performed (step S18). Here, the replacement process is a process in which the data being written is written in one unit (sector or block, etc.) in the data recording area for replacement process on the optical disk prepared in advance assuming a defect. This is a process for replacing the sector or block. Defective sectors are registered and managed.

  After the replacement process, the process moves to the next unit of data, confirms whether or not the data to be recorded remains (step S19), and writes until there is no more data to be recorded. End.

  In this method, since the written data is read and verified immediately after writing, writing (recording) and reading (reproduction) can be performed before the optical disk 11 rotates once. The distance on the track from the end of writing to the end of reading is about 110 μm, and the rotation angle is 1 degree or less.

  Further, since it is known immediately after writing whether or not the data being written has a defect, it is possible to immediately shift to the replacement process. That is, it is possible to omit the waste of writing until one unit is completed thereafter.

  Next, how the recording verification time is shortened when data recording and verification is performed according to the above-described configuration and process will be described. Here, it is limited to the operation and detection of the LD for recording and verification.

  First, as shown in FIG. 6, the recording marks 55 recorded on the recording layer of the optical disc 11 are connected to form a track in the left-right direction. The track interval is, for example, 0.615 μm. The recording mark 55 is a portion formed in the amorphous phase by the first LD irradiation unit 51, and the portion in the track direction sandwiched between the recording marks 55 is a portion formed in the crystal phase by the first LD irradiation unit 51. The first LD irradiation unit 51 records data to be newly recorded while increasing the optical output of the LD and erasing previously recorded data.

  The second LD irradiating unit 52 irradiates the track including 55 recorded marks and the like without interruption while keeping the light output of the LD low and constant.

  The interval between the first LD irradiation unit 51 and the second LD irradiation unit 52 is in a positional relationship proportional to the interval between the light emitting points of the first LD 31 and the second LD 32 in the LD chip 30, for example, the beam so that both intervals are the same. When the reflecting surface of the splitter 35 is bent by 90 degrees, the interval is about 110 μm. The recorded amorphous phase or crystalline phase becomes a sufficiently stable phase as the optical disk rotates and travels through this 110 μm.

  Next, with reference to FIG. 7, a time chart of a recording process including erasure and a subsequent verification process will be described with the relative optical output of the LD taken on the vertical axis. As shown in FIG. 7, writing is performed with Pw having the largest optical output Po (amorphous phase formation), erased with Pe (crystal phase formation) with a slight decrease, and reading (reproduction) is performed with a lower Pr state. The recording process is a process of changing the recording layer into an amorphous phase or a crystalline phase by controlling the pulse output by determining three stages of light output Pw, Pe, and Pe or less, and the collating process is a process of changing the light output. This is a reproduction process in which Pr is read without changing the state of the recording layer.

  FIG. 7A shows the operation of the first LD 31 for recording. Initially, it is in a standby state until a recording data write instruction is received, but when the write instruction is issued (at time t1), the LD control unit 14 starts controlling the light output suitable for the write signal. Thereafter, pulsed LD light is emitted in response to a signal from the LD control unit 14 to form an amorphous phase recording mark 55 and a crystal phase therebetween, and writing is terminated by an instruction from the LD control unit 14 ( t2).

  After that, it is in a standby state until a writing instruction is issued. On the right side of the drawing, for reference, an end time t4 when recording / collation using one conventional LD is entered. The shape of the recording mark 55 corresponding to the optical output of the first LD 31 is schematically shown by shading in the vicinity of the time axis with the horizontal axis as the time axis.

  FIG. 7B shows the operation of the second LD 32 for reproduction. Initially, it is in a standby state until a collation data reading instruction is received, but when a collation instruction is issued simultaneously with the writing instruction (t1), the LD control unit 14 starts control so that a constant light output Pr is obtained. Compared with the first LD 31 for recording shown in FIG. 7A, the start of the collation process may be delayed because of the delay in rotating the track distance of about 110 μm. Then, data is sequentially verified. At the end, since the record written immediately before by the first LD 31 has to be read, the reading is finished (t3) after rotating the track distance of about 110 μm. During this time, the rotation angle of the optical disk 11 is at most about 0.3 degrees, and t3 may be considered to be almost the same as t2.

  For comparison, FIG. 7C shows an operation in the case where conventional recording and reproduction are performed by one LD. As shown in FIG. 7 (c), the first half recording is exactly the same as the operation of the first LD for recording shown in FIG. 7 (a) (from t1 to t2), and the second half reproduction is shown in FIG. 7 (b). This is almost the same as the operation of the second LD for reproduction. However, the playback process time (from t2 to t4) is added after the recording process (from t1 to t2). If the rotation speed of the optical disk 11 is constant in the recording process and the collation process, the time from t1 to t4 is about twice the time from t1 to t2.

  As described above, when comparing (a), (b), and (c) in FIG. 7, the time required for the recording process and the collation process is t3 in (a) and (b) in which two LDs are arranged. -T1 (≈t2-t1), in (c) where one LD is arranged, t4-t1 is obtained, and t4-t3 can be shortened. If the rotation speed of the optical disk 11 in both steps is constant, the former is about half of the latter. In other words, by arranging two LDs, it is possible to play back immediately after recording, and the time required for the recording process and verification process is halved compared to the conventional method, in other words, approximately twice as high-speed recording verification is possible. It becomes.

  Since the verification of the recorded data is sequentially performed over all of the recorded data, an optical disk on which highly reliable data is recorded is used in the same manner as the conventional method for verifying data for each unit. Offering remains the same.

  As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, It can implement in various deformation | transformation within the range which does not deviate from the summary of this invention.

  For example, in order to maximize the recording collation speed, the first LD irradiating unit for recording and the second LD irradiating unit for reproduction are arranged so that the distance on the track is the shortest. When the delay of about one rotation of the optical disc is negligible, the first LD irradiation unit irradiates the position on the track on the recording side in time in a series of recording operations, and the second LD irradiation unit If it is arranged so as to irradiate a position on the track on the side to be recorded first, both LD irradiating parts may be arranged so as to straddle adjacent tracks.

  In addition, an example in which two LDs are used for DVD-RAM recording / reproducing using a red LD having a wavelength of 650 nm band has been shown, but the present invention can be applied to an optical information recording / reproducing apparatus for a writable / rewritable optical disc of other DVD standards. It is. As two LDs for CD, it can be applied to an infrared LD of wavelength 780 nm band, and as two LDs for MO, it is applied to an optical information recording / reproducing apparatus using a red LD of wavelength 680 nm band or 650 nm band It is possible to do. Similarly, the present invention can be applied to an optical information recording / reproducing apparatus using a blue-violet LD of 405 nm band or the like capable of higher density recording.

  In addition, the monolithic two LDs having a light emitting point interval of 110 μm were selected. However, it is appropriate to receive one LD light at the light receiving part of the light receiving PDIC or the monitor PD and remove the other from these light receiving parts. It is. In view of the spread angle of the LD light, the distance to the light receiving portion, and the like, the interval between the light emitting points is preferably 50 μm or more. Moreover, in order to share a lens and a beam splitter by two LD lights, 200 micrometers or less are preferable.

  In addition, an example in which two LDs belonging to the same wavelength band are formed monolithically has been shown. The same wavelength band is a range in which the same function can be maintained in the optical information recording / reproducing apparatus when the wavelength is changed. That is. For example, even if the optical information recording / reproducing apparatus designed in the wavelength 650 nm band is replaced with an LD having a wavelength of 670 nm, the same function can be exhibited. That is, the two LDs of the optical information recording / reproducing apparatus designed in the 650 nm band may be replaced with a 670 nm LD, or a combination in which one is replaced with a 650 nm LD and the other is replaced with a 670 nm LD. However, if it deviates from the designed wavelength by more than 25 nm, it becomes difficult to exhibit all the functions of the optical information recording / reproducing apparatus. Usually, since the LD with the center wavelength of the design value is used, the allowable range of the wavelengths of the two LDs is ± 25 nm.

  Also, an example in which two LDs belonging to the same wavelength band are formed monolithically has been shown. For example, for an optical information recording / reproducing apparatus capable of recording and reproducing both CD and DVD, two LDs for 650 nm band It is possible to manufacture and use an integrated laser in which a total of four LDs of two LDs for the 780 nm band are integrated monolithically. Similarly, by adding two blue-violet LDs for the 405 nm band, it is possible to form and use an integrated laser in which a total of four or more combined LDs are integrated in a hybrid or monolithic manner.

  In addition, although the example in which the integrated laser is housed in a metal envelope has been shown, it may be housed in an envelope in which an LD chip is mounted on a lead frame and a plastic material is combined.

1 is a block diagram schematically showing the configuration of an optical information recording / reproducing apparatus according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows schematically the optical head which is the main components of the optical information recording / reproducing apparatus based on the Example of this invention. The perspective view of the integrated laser which is the main components of the optical head which notched some envelopes which concern on the Example of this invention. The perspective view which shows LD chip which integrated two LD concerning the Example of this invention monolithically. The flowchart which shows the operation | movement of recording and collation of the information which concerns on the Example of this invention. The top view which expands and schematically shows the recording mark recorded on the recording layer of the optical disk based on the Example of this invention, and the irradiation part of two LD. The time chart which compared the optical output in the recording process and collation process performed using two LD which concerns on the Example of this invention with the case where one LD is used.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 5 Integrated laser 11 Optical disk 12 Spindle motor 13 Optical head 14 LD control part 15 Modulation part 16 Data collation part 17 Demodulation part 18 Servo control part 21 Controller 22 Interface 30 LD chip 31 1st LD
32 2nd LD
33 Lead pin 34 First monitor PD
35 Beam splitter 36 Collimating lens 37 Objective lens 38 Condensing lens 39 Light receiving PDIC
40 Second monitor PD
41 First LD light 42 Second LD light 43 Separation groove 45 Insulating submount 46 Stem 47 Cap 48 Window glass 51 First LD irradiation part 52 Second LD irradiation part 55 Recording mark

Claims (8)

An optical information recording / reproducing apparatus for an information recording medium having a spiral track on which data is recorded and a format having a sector area or a block area including a data area,
A first laser diode for recording data on the information recording medium;
A second laser diode for reading data recorded on an information recording medium placed adjacent to the first laser diode and having an oscillation optical axis parallel thereto;
The first laser diode and the second laser diode irradiate a track, and the first laser diode irradiates a position on the track on the recording side after a series of recording operations. The second laser diode is disposed so as to irradiate a position on a track on the side to be recorded first, and light emission of the first and second laser diodes is individually controlled. Information recording / reproducing apparatus.   2. The optical information recording / reproducing according to claim 1, wherein the second laser diode is arranged so as to irradiate a portion having a shortest distance on a track with the first laser diode irradiation portion. apparatus.   3. The optical information recording / reproducing apparatus according to claim 1, wherein the first laser diode and the second laser diode are formed monolithically on the same semiconductor substrate.   4. The optical information recording / reproducing apparatus according to claim 1, wherein an interval between light emitting points of the first laser diode and the second laser diode is 50 μm to 200 μm. 5.   5. The oscillation wavelength of the first laser diode and the second laser diode is any one of a 780 nm band, a 680 nm band, a 650 nm band, and a 405 nm band. 2. An optical information recording / reproducing apparatus according to item 1.   6. The optical information recording / reproducing apparatus according to claim 1, wherein a deviation in oscillation wavelength between the first laser diode and the second laser diode is 50 nm or less. An optical information recording collation method to an information recording medium having a spiral track on which data is recorded and a format having a sector area or a block area including a data area,
Preparing the first data based on the recording instruction;
Recording the first data on the information recording medium using a first laser diode to form second data;
Irradiating the second data with a second laser diode and reading it before the information recording medium makes one revolution after recording by the first laser diode;
Collating the read second data with the first data;
An optical information recording collating method characterized by comprising:   As a result of collating the second data with the first data, if it is determined that the second data does not match the first data, a replacement sector prepared in advance in units of one sector or block Or it replaces with a replacement block, The optical information recording collation method of Claim 7 characterized by the above-mentioned.

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