JP2007149162A - Optical disk recording/reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device capable of discriminating whether a disk is a two-layer optical disk or a one-layer optical disk by simple processing. <P>SOLUTION: When an optical disk is inserted to start a mounting process, a one-layer laser beam is set in a focus-on state to focus the one-layer laser beam emitted from an optical pickup to the recording surface of the optical disk, a sub-TE signal obtained by receiving, with a sub-light receiving section of the optical pickup, a part of a light leaked from the main light receiving part of the optical pickup among reflected lights obtained by reflecting the one-layer laser beam applied to the recording surface of the optical disk is measured, and whether the offset of the signal is equal or larger than a threshold value. When the offset is determined to be not less than the threshold value, the inserted optical disk is determined to be two-layer optical disk. When the offset is determined to be less than the threshold value, the inserted optical disk is determined to be one-layer optical disk. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc recording / reproducing apparatus that includes an optical pickup capable of emitting at least two types of laser beams having different wavelengths and that can record / reproduce information with respect to a single-layer optical disc or a dual-layer optical disc. In particular, the present invention relates to a disc discrimination process when discriminating between a single-layer optical disc and a double-layer optical disc.

  Conventionally, an optical disc recording / reproducing apparatus has a disc discriminating function for discriminating the type of an inserted optical disc, and uses disc information or address information of a lead-in zone defined by the disc standard. After reading, it is discriminated from the disc information or address information whether the disc is logically a two-layer optical disc or a single-layer optical disc.

  For example, in the optical disc recording / reproducing apparatus described in Patent Document 1, at least two control signals obtained from an inserted optical disc (a control signal including a reproduction signal and a focus signal, a control signal including a reproduction signal and a tracking error signal, A control signal including a focus error signal and a tracking error signal, a control signal including a level of the focus error signal and the number of S curves of the focus error signal, a control signal including a focus on signal and a tracking error signal, or a tracking error signal Control signal including the offset amount and the level of the tracking error signal) and inserted according to the detection results of the first and second signal detection means. Discriminating means for discriminating the type of optical disc, and inserting Type of the optical disk that has been (DVD-S (1-layer disc), DVD-D (2-layer disc), CD, CD-R) is adapted to determine.

  Further, the optical recording medium identifying device described in Patent Document 2 determines whether or not there is an offset in the tracking error signal detected by the first optical pickup or the second optical pickup when the tracking servo is off. Means for discriminating the type of the inserted optical disc (CD and single-sided recording SD or double-sided recording / single-sided reading SD or single-sided recording high-density SD or double-sided recording / single-sided high density SD).

In addition, the optical disc recording / reproducing apparatus described in Patent Document 3 generates a sum signal and a focus error signal generated based on the amount of reflection of the laser beam on the surface of the inserted optical disc for each of the laser beams having different wavelengths. Based on the sum signal and the focus error signal detected by the laser beams having different wavelengths detected, the type of the inserted optical disk (DVD-RAM, DVD-ROM (double layer), CD-R, DVD-ROM ( 1 layer), CD-ROM, CD-R). Further, the type of the inserted optical disk is determined based on the number of zero crossings of the focus error signal generated based on the amount of reflection of the laser beam on the surface of the inserted optical disk.
JP-A-9-320180 JP-A-9-204705 JP-A-11-213530

  However, the optical disc recording / reproducing apparatus described in Patent Document 1 detects at least two control signals obtained from the inserted optical disc, and determines the type of the inserted optical disc according to the detection result. Therefore, at least two control signals for discriminating the type of the optical disk are necessary. However, these two control signals cannot be taken out unless the mounting process after the optical disk is inserted until the end. In order to discriminate a layered optical disc (DVD-D), the average value of the signal reflected from the first recording surface and the signal reflected from the second recording surface is used as discrimination data. However, in order to generate this discrimination data, both the recording surface of the first layer and the recording surface of the second layer must be irradiated with a laser beam (laser light). In Ino, process control and disc discrimination of the optical pickup becomes complicated, problem arises that it takes much processing time of disc discrimination.

  Further, in the optical recording medium identification device described in Patent Document 2, the presence or absence of offset of the tracking error signal detected by the first optical pickup or the second optical pickup when the tracking servo is off is discriminated. However, there is no disclosure of discriminating between two-layer optical discs.

  In addition, the optical disc recording / reproducing apparatus described in Patent Document 3 determines the type of the inserted optical disc, and generates a sum signal and a focus error signal that are generated based on the amount of reflection of laser light on the surface of the inserted optical disc. Is detected for each of the laser beams having different wavelengths, and the type of the inserted optical disk is discriminated based on the sum signal and the focus error signal by the detected laser beams having different wavelengths. In order to discriminate a two-layer optical disk, both the recording surface of the first layer and the recording surface of the second layer must be irradiated with laser light, the disc discrimination process becomes complicated, and the discrimination processing time is also long. Such a problem arises.

  The present invention has been made to solve the above-described problems, and an optical disc recording having a disc discrimination function capable of discriminating between a two-layer optical disc and a single-layer optical disc by a simple process. An object is to provide a playback device.

  In order to achieve the above object, the invention of claim 1 is provided with an optical pickup capable of emitting at least two types of laser beams having different wavelengths, and records / reproduces information with respect to a single-layer optical disk or a double-layer optical disk. In an optical disc recording / reproducing apparatus capable of performing, the optical disc is inserted, the mounting process is started, and the laser light for one layer is emitted in a focus-on state in which the focus of the laser light for one layer is focused on the recording surface of the optical disc. An optical pickup control means for controlling the optical pickup so as to emit; and a main light receiving portion of the optical pickup out of reflected light that is reflected when the laser light for the first layer is irradiated onto the recording surface of the optical disc in the focus-on state From the optical pickup obtained by receiving a part of the leaked light from the sub light receiving part of the optical pickup An offset determination unit that measures a sub-tracking error signal and determines whether or not the offset of the sub-tracking error signal is equal to or greater than a threshold value, and an optical disk that is inserted when the offset is determined to be equal to or greater than the threshold value And a disc controller for discriminating that the inserted optical disc is a single-layer optical disc if the offset is determined to be less than a threshold value. An optical disc recording / reproducing apparatus is provided.

  In this configuration, when the optical disk is inserted and the mounting process is started, the optical pickup control means brings the single-layer laser light into a focus-on state in order to focus the single-layer laser light on the recording surface of the optical disk. To do. In this focus-on state, the offset determination means optically picks up a part of the leaked light leaked from the main light receiving part of the optical pickup out of the reflected light that is reflected when the recording light of the optical disk is irradiated onto the recording surface of the optical disc. The sub-tracking error signal from the optical pickup obtained by receiving the light at the sub-light receiving unit is measured, and it is determined whether or not the offset is equal to or greater than a threshold value. The disc determination means determines that the inserted optical disc is a two-layer optical disc when it is determined that the offset is equal to or greater than a threshold value, and inserts when the offset is determined to be less than the threshold value. The optical disc being used is determined to be a single-layer optical disc.

  According to this configuration, a part of the leaked light leaked from the main light receiving portion of the optical pickup out of the reflected light that is reflected when the recording surface of the optical disk is irradiated with the laser light for one layer is received by the sub light receiving portion of the optical pickup. By determining whether or not the offset of the sub-tracking error signal from the optical pickup obtained in this way is greater than or equal to a threshold value, whether the inserted optical disk is a two-layer optical disk or a single-layer optical disk Since the determination is made, the optical disk inserted is a double-layer optical disk or a single-layer optical disk before reading the disk information or address information in the lead-in zone of the optical disk, that is, before the mounting process is completed. Can be determined by simple processing, which makes setting processing according to the inserted optical disk faster. As a result, it is possible to start earlier recording or reproducing the optical disc being inserted.

  According to a second aspect of the present invention, there is provided an optical pickup capable of emitting at least two types of laser beams having different wavelengths, and an optical disc recording / reproducing capable of recording / reproducing information on a single-layer optical disc or a dual-layer optical disc. In the apparatus, the optical disk is inserted, the mounting process is started, and the single-layer laser light is emitted from the optical pickup in a focus-on state in which the focus of the single-layer laser light is focused on the recording surface of the optical disk. Measuring a sub-tracking error signal from the optical pickup obtained by receiving leakage light of reflected light that is reflected when the laser light for one layer is irradiated and reflected on the recording surface of the optical disc in the focus-on state; If the offset of the sub-tracking error signal is equal to or greater than the threshold value, the inserted optical disk is replaced with a two-layer optical disk. Determines that, to provide an optical disk recording and reproducing apparatus characterized by comprising a system controller for determining that the optical disk has been inserted is less than the threshold value is an optical disk of the first layer.

  In this configuration, when the optical disk is inserted, the mounting process is started, and the single-layer laser light is emitted from the optical pickup in a focus-on state with respect to the recording surface of the optical disk, the single-layer laser light is recorded on the optical disk. Of the reflected light that is irradiated onto the surface, the leaked light is received by the optical pickup, and if the offset of the sub-tracking error signal due to the leaked light is greater than or equal to the threshold value, the inserted optical disk has two layers. If it is determined that the optical disk is an optical disk and is less than the threshold value, it is determined that the inserted optical disk is a single-layer optical disk.

  According to this configuration, the offset of the sub-tracking error signal obtained by receiving the leaked leaked light of the reflected light that is reflected by irradiating the recording surface of the optical disc with the single-layer laser light is the threshold value. By determining whether or not the above is true, it is determined whether the inserted optical disk is a two-layer optical disk or a single-layer optical disk. Before reading the address information, that is, before the mounting process is completed, it is possible to determine whether the inserted optical disk is a two-layer optical disk or a single-layer optical disk by a simple process. The setting process corresponding to the inserted optical disk can be performed quickly, and as a result, recording or reproduction can be performed quickly on the inserted optical disk. It can be started.

  According to a third aspect of the present invention, in the second aspect of the invention, the first layer laser light is obtained by receiving leakage light of reflected light that is reflected when the recording surface of the optical disk is irradiated in the focus-on state. The sub-tracking error signal from the optical pickup leaks from the main light receiving portion of the optical pickup out of the reflected light that is reflected when the laser light for the first layer is irradiated onto the recording surface of the optical disc in the focus-on state. Since it is a sub-tracking error signal from the optical pickup obtained by receiving a part of the leakage light by the sub-light receiving unit of the optical pickup, if a sub-tracking error signal from the sub-light receiving unit of the optical pickup is used, Whether the inserted optical disk is a two-layer optical disk or a single-layer optical disk can be determined with a simple process. So as to.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the system controller is configured to focus on the single-layer laser beam to be focused on the recording surface of the optical disk after the optical disk is inserted and the mounting process is started. Optical pickup control means for controlling the optical pickup so as to emit laser light for one layer in a state, and reflected light reflected from the recording surface of the optical disk irradiated with the laser light for one layer in the focus-on state. The sub-tracking error signal is measured by measuring the sub-tracking error signal from the optical pickup obtained by receiving a part of the leaked light from the main light-receiving unit of the optical pickup by the sub-light-receiving unit of the optical pickup. Offset determining means for determining whether or not the offset is greater than or equal to a threshold, and the offset is a threshold If it is determined that the optical disc is determined to be above, the inserted optical disc is determined to be a two-layer optical disc. If the offset is determined to be less than the threshold value, the inserted optical disc is a single-layer optical disc. Disc judging means for judging that.

  Therefore, the system controller can realize the optical pickup control process, the offset determination process, and the disk determination process, thereby determining whether or not the offset of the sub-tracking error signal is greater than or equal to the threshold value, and inserting It is possible to determine whether the optical disc being used is a two-layer optical disc or a single-layer optical disc.

  As described above, according to the present invention, an optical pickup capable of emitting at least two types of laser beams having different wavelengths is provided, and information can be recorded / reproduced with respect to a single-layer optical disk or a double-layer optical disk. In the optical disc recording / reproducing apparatus, the optical disc is inserted, the mounting process is started, and the single layer laser beam is emitted in a focus-on state in which the focus of the single layer laser beam is focused on the recording surface of the optical disc. Optical pickup control means for controlling the optical pickup, and leakage light leaked from the main light receiving portion of the optical pickup out of the reflected light that is reflected when the first layer laser light is irradiated onto the recording surface of the optical disc in the focus-on state. Sub-tracking from the optical pickup obtained by receiving a part of the optical pickup by the sub-light-receiving portion of the optical pickup An error determination unit that measures an error signal and determines whether or not the offset of the sub-tracking error signal is equal to or greater than a threshold value, and two optical disks that are inserted when the offset is determined to be equal to or greater than the threshold value. A disc controller for discriminating that the inserted optical disc is a single-layer optical disc when it is determined that the optical disc is a single-layer optical disc. A simple process determines whether the inserted optical disk is a two-layer optical disk or a single-layer optical disk before reading the disk information or address information in the lead-in zone of the optical disk, that is, before the mounting process is completed. This makes it possible to perform setting processing according to the inserted optical disk. Kudeki, this result can be started earlier recording or reproducing the optical disc being inserted.

  According to the present invention, there is provided an optical pickup capable of emitting at least two types of laser beams having different wavelengths, and optical disc recording capable of recording / reproducing information on a single-layer optical disc or a dual-layer optical disc. In the reproducing apparatus, the optical disk is inserted, the mounting process is started, and the single-layer laser light is emitted from the optical pickup in a focus-on state in which the focus of the single-layer laser light is focused on the recording surface of the optical disk. Measuring the sub-tracking error signal from the optical pickup obtained by receiving the leakage light of the reflected light that is reflected when the recording light of the optical disk is irradiated and reflected on the recording surface of the optical disc in the focus-on state, If the offset of the sub-tracking error signal is equal to or greater than the threshold, the inserted optical disk is A system controller that determines that the inserted optical disk is a single-layer optical disk if it is less than the threshold, before reading disk information or address information in the lead-in zone of the optical disk. That is, before the mounting process is completed, it is possible to determine whether the inserted optical disk is a two-layer optical disk or a single-layer optical disk by a simple process. The corresponding setting process can be performed quickly, and as a result, recording or reproduction can be started quickly with respect to the inserted optical disk.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.

  This optical disk recording / reproducing apparatus can emit a laser beam having at least two kinds of wavelengths and a system controller 22 for controlling the entire apparatus, a spindle motor 5 for rotating the optical disk 1, and writing / reading information to / from the optical disk 1. , An optical pickup 2 that optically performs this, a thread 3 for moving the optical pickup 2 in the radial direction of the optical disc 1, a spindle motor 5 via a motor drive circuit 34 in accordance with an instruction from the system controller 22, and The sled 3 is driven, and the objective lens (not shown) built in the optical pickup 2 is moved so that the focal position of the laser light is moved in the vertical and horizontal directions with respect to the recording surface of the optical disc 1. Servo control unit 4 that performs tilt control of optical pickup 2 It is equipped with a.

  The optical disc recording / reproducing apparatus also amplifies an RF signal which is a read signal from the optical pickup 2 during reproduction of the optical disc 1 and converts the RF signal output from the RF amplifier 6 into digital data. A digital signal processing unit 8 that stores data generated by performing signal demodulation processing and error correction processing according to the data format of the optical disc 1 in a RAM 7 as a reproduction buffer memory, and digital signal processing according to instructions from the system controller 22 A stream separation unit 9 that separates audio data, sub-picture data, and video data from the data stream output from the unit 8;

  The optical disc recording / reproducing apparatus also receives an audio decoder 11 that receives the audio data output from the stream separation unit 9 and performs a predetermined decoding process, and temporarily stores the data to perform the decoding process in the audio decoder 11. The RAM 10 to be stored in the sub-picture decoder 13, the sub-picture decoder 13 that inputs the sub-picture data output from the stream separation unit 9 and performs a predetermined decoding process, and the sub-picture decoder 13 temporarily stores the data to perform the decoding process. A video MPEG decoder 15 that receives the video data output from the stream separation unit 9 and performs decoding processing by MPEG (Moving Picture Experts Group), and the video MPEG decoder 15 performs decoding processing. RAM 1 for temporarily storing data in 4 is provided.

  The optical disk recording / reproducing apparatus also includes a video processor 17 that synthesizes the data output from the video MPEG decoder 15 and the data output from the sub-picture decoder 13 in accordance with an instruction from the system controller 22, and the video processor 17. A video encoder 18 that converts the output synthesized data into a video signal for display and displays an image on the display device 20, and an audio circuit (not shown) that converts the data output from the audio decoder 11 into an analog audio signal. For example, a D / A converter 16 supplied to the speaker 19 is provided.

  The optical disc recording / reproducing apparatus also has a recording key for giving a recording instruction to the system controller 22, a reproducing key for giving a reproducing instruction, a stop key for giving a recording / reproducing stop instruction, a power key, and the like. And a remote controller 21 having various operation keys. In addition, this optical disk recording / reproducing apparatus performs a calculation process according to the flash ROM 23 storing a program and data for controlling each component of the apparatus and controlling the entire apparatus, and the program and data of the flash ROM 23. A CPU 24 for controlling the system controller 22 and a RAM 27 for temporarily storing data necessary for arithmetic processing of the CPU 24 are provided.

  The optical disk recording / reproducing apparatus also includes a tuner 29 connected to an antenna 28, an analog video / audio signal of a television broadcast selected by the tuner 29, or a television receiver or other video / audio output not shown. An A / D conversion circuit 30 that converts a video / audio signal from the device into digital video / audio data, an MPEG encoder 31 that encodes the video / audio data in MPEG, and the encoded video / audio data (encoded data) temporarily. A RAM 32 serving as a recording buffer memory for storing a predetermined amount in the memory, an ATAPI (AT Attachment Packet Interface) 33 that is an interface connected to the recording data modulation circuit 25, and encoded data sent from the ATAPI 33 are recorded on the optical disc 1. Recording data to be modulated And a laser modulation circuit 26 for outputting a laser modulation signal for modulating laser light emitted from the optical pickup 2 to the optical pickup 2 based on the modulation data modulated by the recording data modulation circuit 25. I have.

  The system controller 22 is a focus-on state in which the optical disk 1 is inserted as a characteristic element of the present embodiment, the mounting process is started, and the focus of the laser light for one layer is focused on the recording surface of the optical disk 1 And optical pickup control means 221 for controlling the optical pickup 2 so as to emit the laser light for one layer, and the reflected light reflected by the recording light of the optical disc 1 being irradiated with the laser light for the first layer in the focus-on state. Among these, the sub light from the optical pickup 2 obtained by receiving a part of the leaked light leaked from the main light receiving portion 2a (see FIG. 2) of the optical pickup 2 by the sub light receiving portion 2b (see FIG. 2) of the optical pickup 2. An offset that measures a tracking error signal and determines whether the offset of the sub-tracking error signal is greater than or equal to a threshold value If it is determined that the offset is equal to or greater than a threshold value, the inserted optical disk 1 is determined to be a two-layer optical disk, and if it is determined that the offset is less than the threshold value, And disc determination means 223 for determining that the inserted optical disc 1 is a single-layer optical disc.

  FIG. 2 is a block diagram showing a configuration of a light receiving unit and a tracking error signal calculation circuit included in the optical pickup in the present embodiment. FIG. 3 is a view showing each light receiving region of the main photo detector and the sub photo detector provided in the light receiving unit. In FIG. 3, a main photo detector 201 has light receiving areas a, b, c, and d divided into four vertical and horizontal as viewed from the figure, and the preceding sub-detector 202 is arranged in two horizontally as viewed from the figure. The rear sub-detector 203 has light receiving regions g and h of the light receiving element which are divided into two laterally as seen in the figure. Here, the output signals of the light receiving areas a, b, c, and d of the main photodetector 201 are A, B, C, and D, the output signals of the light receiving areas e and f of the light receiving element of the preceding sub-detector 202 are E and F, The output signals of the light receiving areas g and h of the rear sub-photodetector 203 are G and H.

  In FIG. 2, an optical pickup 2 emits a laser beam composed of a main beam and a sub beam to an optical disc, and receives a reflected light of the main beam from a target track of the optical disc, and from the target track. The sub-beam light receiving unit 2b that receives the reflected light of the sub-beam from the shifted position and the tracking error signal calculation circuit 60 are configured. The main light receiver 2a has a main photodetector 201 (see FIG. 3) that receives the reflected light of the main beam from the target track on the optical disc, and the main photodetector 201 outputs signals A, B, C, and D.

  Further, the sub light receiving unit 2b includes a preceding sub-photodetector 202 (see FIG. 3) that receives the preceding reflected light of the sub beam from a position shifted from the target track on the optical disc, and a position from the position shifted from the target track on the optical disc. A rear sub-detector 203 (see FIG. 3) that receives reflected light behind the sub-beam, the preceding sub-photo detector 202 outputs signals E and F, and the rear sub-photo detector 203 outputs signals G and H.

  The tracking error signal calculation circuit 60 includes a sum calculator 61, a sum calculator 62, a difference calculator 63, a sum calculator 64, a sum calculator 65, and a difference calculator 66. The sum calculator 61 calculates the sum of the signal A and the signal D from the main light receiving unit 2a and outputs the sum as a signal (A + D). The sum calculator 62 calculates the sum of the signal B and the signal C from the main light receiving unit 2a and outputs the sum as a signal (B + C). The difference calculator 63 calculates the difference between the signal (A + D) from the sum calculator 61 and the signal (B + C) from the sum calculator 62 and outputs the difference as a signal [(A + D) − (B + C)]. This signal [(A + D) − (B + C)] becomes a TE (tracking error) signal.

  The sum calculator 64 calculates the sum of the signal E and the signal H from the sub light receiving unit 2b and outputs the sum as a signal (E + H). The sum calculator 65 calculates the sum of the signal F and the signal G from the sub light receiving unit 2b and outputs the sum as a signal (F + G). The difference calculator 66 calculates the difference between the signal (E + H) from the sum calculator 64 and the signal (F + G) from the sum calculator 65 and outputs the difference as a signal [(E + H) − (F + G)]. This signal [(E + H) − (F + G)] becomes a sub TE (tracking error) signal.

  FIG. 4 is a flowchart for explaining the disk discrimination processing in this embodiment. The disc discrimination process will be described with reference to this flowchart and FIGS.

  First, when the optical disc 1 is inserted into the optical disc recording / reproducing apparatus, the system controller 22 detects that the optical disc 1 has been inserted (step S1), and is a so-called mount that is a process of starting up the optical disc 1 and reading disc information. The process is started (step S2). Then, the optical pickup control means 221 of the system controller 22 controls the servo control unit 4 to adjust the focusing actuator (not shown) of the optical pickup 2 in order to focus the recording layer 1 on the recording surface of the optical disc 1. By driving, the objective lens is moved in the direction perpendicular to the recording surface of the optical disc 1, and the single layer laser beam is brought into a focus-on state (step S3).

  In this focus-on state, the offset determination unit 222 of the system controller 22 leaks from the main light receiving unit 2a of the optical pickup 2 out of the reflected light that is reflected when the recording light of the optical disc 1 is irradiated with the laser light for the first layer. A sub TE signal (output signal of the difference calculator 66) from the optical pickup 2 obtained by receiving a part of the leaked light by the sub light receiving unit 2b of the optical pickup 2 is measured (step S4), and the offset is It is determined whether or not the threshold value is exceeded (step S5).

  The reason why it is determined whether or not the offset of the sub TE signal is equal to or greater than the threshold value is as follows. The laser beam from the optical pickup 2 is applied to the recording surface of the optical disc 1 regardless of whether the optical disc 1 is a single-layer optical disc or a two-layer optical disc. Since it is set on the recording surface, when the inserted optical disc 1 is a two-layer optical disc, laser light is irradiated on the first recording surface, and a part of the irradiated laser light is reflected on the second layer. The light reaching the recording surface and the reflected light from the second recording surface and the reflected light from the first recording surface (reflected light other than the reflected light incident on the main light receiving portion 2a) become leakage light.

  On the other hand, when the inserted optical disk 1 is a single-layer optical disk, reflected light other than the reflected light incident on the main light receiving unit 2a becomes leakage light. Comparing the leakage light from the two-layer optical disk and the leakage light from the one-layer optical disk, the leakage light from the two-layer optical disk is larger than the leakage light from the one-layer optical disk. As a result, the offset of the sub TE signal is 2 A layered optical disc is larger. Therefore, by determining whether or not the offset of the sub TE signal is equal to or greater than the threshold, it is possible to determine whether the optical disc 1 is a two-layer optical disc or a single-layer optical disc.

  When it is determined that the offset is greater than or equal to the threshold (step S5), the disk determination unit 223 of the system controller 22 determines that the inserted optical disk 1 is a two-layer optical disk (step S6). If it is determined that the offset is less than the threshold (step S5), the inserted optical disk 1 is determined to be a single-layer optical disk (step S8). When it is determined that the inserted optical disk 1 is a two-layer optical disk, the system controller 22 sets the setting corresponding to the two-layer optical disk (the rotation speed of the spindle motor 5 in the case of a two-layer optical disk is set to one layer). In the case of the optical disk of the above, the motor control setting is set so that the number of rotations of the spindle motor 5 becomes 1.1 times that of the optical disk (step S7), and it is determined that the inserted optical disk 1 is a single-layer optical disk. If so, the system controller 22 performs settings corresponding to the single-layer optical disk (settings such as motor control settings for the spindle motor 5 in the case of a single-layer optical disk) (step S9).

  As described above, according to the present embodiment, a part of the leaked light leaked from the main light receiving portion of the optical pickup out of the reflected light that is reflected when the recording surface of the optical disc is irradiated with the laser light for one layer is picked up by the optical pickup. Whether the inserted optical disk is a two-layer optical disk or not is determined by determining whether or not the offset of the sub-tracking error signal from the optical pickup obtained by receiving the light at the sub light-receiving unit is greater than or equal to the threshold value. Therefore, before reading the disc information or address information in the lead-in zone of the optical disc, that is, before the mounting process is completed, the inserted optical disc is a two-layer optical disc. Whether it is a single-layer optical disk or not can be determined with a simple process. Setting process can be faster, as a result, it is possible to start earlier recording or reproducing the optical disc being inserted.

It is a block diagram which shows the structure of the optical disk recording / reproducing apparatus which concerns on one Embodiment of this invention. FIG. 3 is a block diagram illustrating a configuration of a light receiving unit and a tracking error signal calculation circuit included in the optical pickup in the embodiment. It is a figure which shows each light-receiving area | region of the main photodetector provided in the said light-receiving part, and a subphotodetector. 4 is a flowchart for explaining a disk discrimination process in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical pick-up 2a Main light-receiving part 2b Sub light-receiving part 22 System controller 221 Optical pick-up control means 222 Offset determination means 223 Disc determination means

Claims (4)

In an optical disc recording / reproducing apparatus equipped with an optical pickup capable of emitting at least two types of laser beams having different wavelengths and capable of recording / reproducing information with respect to a single-layer optical disc or a double-layer optical disc,
Light for controlling the optical pickup so that the single layer laser beam is emitted in a focus-on state in which the optical disc is inserted and the mounting process is started, and the focus of the single layer laser beam is focused on the recording surface of the optical disc. Pickup control means;
A part of the leaked light leaked from the main light receiving portion of the optical pickup out of the reflected light that is reflected when the laser light for the first layer is irradiated onto the recording surface of the optical disc in the focus-on state is sub-light receiving portion of the optical pickup An offset determination means for measuring a sub-tracking error signal from the optical pickup obtained by receiving the light and determining whether or not the offset of the sub-tracking error signal is equal to or greater than a threshold;
If it is determined that the offset is greater than or equal to the threshold value, the inserted optical disk is determined to be a two-layer optical disk, and if the offset is determined to be less than the threshold value, one optical disk is inserted. An optical disc recording / reproducing apparatus comprising a system controller having disc determination means for determining that the disc is an optical disc. In an optical disc recording / reproducing apparatus equipped with an optical pickup capable of emitting at least two types of laser beams having different wavelengths and capable of recording / reproducing information with respect to a single-layer optical disc or a double-layer optical disc,
The optical disk is inserted, the mounting process starts, and the single-layer laser light is emitted from the optical pickup in a focus-on state in which the focus of the single-layer laser light is focused on the recording surface of the optical disk. The sub-tracking error signal is measured by measuring the sub-tracking error signal from the optical pickup obtained by receiving the leakage light of the reflected light that is reflected when the laser light is irradiated onto the recording surface of the optical disk in the focus-on state. A system controller that determines that the inserted optical disk is a two-layer optical disk if the signal offset is equal to or greater than a threshold value, and determines that the inserted optical disk is a single-layer optical disk if the signal offset is less than the threshold value; An optical disc recording / reproducing apparatus comprising:   The sub-tracking error signal from the optical pickup obtained by receiving the leakage light of the reflected light that is reflected when the laser light for the first layer is irradiated and reflected on the recording surface of the optical disc in the focus-on state, A part of the leaked light leaked from the main light receiving part of the optical pickup out of the reflected light that is reflected when the laser light for one layer is irradiated on the recording surface of the optical disk in the focus-on state is reflected by the sub light receiving part of the optical pickup. 3. The optical disk recording / reproducing apparatus according to claim 2, wherein the optical disk recording / reproducing apparatus is a sub-tracking error signal obtained by receiving light from the optical pickup.   The system controller is configured to emit the single-layer laser light in a focus-on state in which an optical disk is inserted and a mounting process is started to focus the single-layer laser light on the recording surface of the optical disk. Optical pickup control means for controlling the pickup; and leakage light leaked from the main light receiving portion of the optical pickup out of reflected light that is reflected when the laser light for the first layer is irradiated onto the recording surface of the optical disc in the focus-on state. An offset for determining whether or not the offset of the sub-tracking error signal is equal to or greater than a threshold value by measuring a sub-tracking error signal from the optical pickup obtained by receiving a part of the light by the sub-light receiving unit of the optical pickup. Inserted if it is determined that the offset is greater than or equal to a threshold value with the determination means Disc discriminating means for discriminating that the disc is a two-layer optical disc and judging that the inserted optical disc is a one-layer optical disc when the offset is judged to be less than a threshold value. The optical disc recording / reproducing apparatus according to claim 2.

Images