JP2006318561A - Disk recording device, disk recording method, disk recording program, recording medium, and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress useless consumption of a PCA and preventing sound of mechanical operation due to the OPC processing from being recorded at the time of starting recording. <P>SOLUTION: When the disk is loaded, the last use position PCAddr of the PCA is searched after disk discrimination, servo adjustment, and RMA reading. When the PCAddr is larger than a prescribed address A in the PCA and the already used quantity of the PCA is small, the OPC processing is executed. When the PCAddr is smaller than the prescribed address A and the already used quantity of the PCA is large, the OPC processing is performed at the time of starting recording. When the already used quantity of the PCA is small, the OPC processing is performed in advance at the time of disk insertion, and the OPC processing is not performed at the time of starting recording. Thus, the sound of mechanical operation due to the OPC processing or the like is not recorded. When the already used quantity of the PCA is large, because the OPC processing is not performed until starting recording, the PCA is not uselessly consumed by the loading/unloading of the disk without accompanied by recording. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk recording apparatus, a disk recording method, a disk recording program and a recording medium, and an imaging apparatus suitable for recording data on an optical disk using a laser beam.

  In recent years, it has become common to use recordable optical disks as recording media for recording digital data. In the field of optical discs, a plurality of types of recordable optical discs having different physical characteristics while maintaining reproduction compatibility have been developed and put into practical use. These types of recordable optical discs are rapidly spreading because they have the same recording capacity as playback-only optical discs and are compatible with playback.

  As such recordable optical disks, there are CD-R (Compact Disc-Recordable) and CD-RW (Compact Disc-ReWritable), which conform to the CD (Compact Disc) standard, and the DVD (Digital Versatile Disc) standard. DVD-R (DVD Recordable), DVD + R (DVD + R format), DVD-RW (DVD Re-recordable), DVD + RW (DVD + RW format), and the like are widely known. Among these, the type conforming to the DVD standard has a large recording capacity of 4.7 GB (Giga Byte) or more, is suitable for recording video data, and is particularly popular.

  With the widespread use of recordable optical discs, products using recordable optical discs of the type conforming to the DVD standard have appeared in the field of portable video cameras where magnetic tape has been used as recording media. Yes. Such a product is extremely convenient because a captured video can be viewed simply by loading a disc taken out of a portable video camera into a stationary playback device at home, for example.

  Among the recordable optical discs of the type conforming to the above-mentioned DVD standard, DVD-RW and DVD + RW, in which data can be rewritten, have a phase change film that forms a disc recording layer by the energy of laser light, a crystalline layer and an amorphous layer. A phase change method that reversibly changes between layers is used. On the other hand, DVD-R and DVD + R, which can only add data, use a method of condensing laser light on a disk recording layer made of an organic dye and deforming the recording layer and the adjacent substrate surface and reflecting layer. .

When recording on a recordable optical disc, a process called OPC (Optimum Power Control) is performed in order to obtain an optimum recording power of the laser beam. In this method, test writing is performed using a predetermined area on the disk based on laser power information recorded in advance on the disk, and the optimum recording power is obtained. The trial writing is performed using a predetermined area provided on the disc. For example, in the DVD-R standard and the DVD-RW standard, an area called PCA (Power Caribration Area) is defined as an area for trial writing. Patent Document 1 describes a technique for performing OPC processing at higher speed and higher accuracy.
Japanese Patent Laid-Open No. 2004-213808

  The OPC process is usually performed immediately before the start of recording. This is because there is an upper limit to the number of OPC processes that can be performed using PCA. That is, for example, if the OPC process is performed when a disk is loaded in the drive device, the PCA is wasted every time the disk is loaded and ejected regardless of whether or not data is recorded on the disk. In this case, for example, since the PCA is used up, there is a possibility that a recording operation cannot be performed on the disc even though there is a sufficient recordable area on the disc.

  Here, let us consider a case where when a recordable optical disk is used as a recording medium of a portable video camera, the specification is such that OPC processing is performed immediately before the start of recording. Since the OPC process requires a certain amount of processing time, in this case, there is a problem that the timing at which recording is actually started is delayed with respect to an operation for instructing the user to start recording. This is not preferable as the operation of the portable video camera.

  In order to solve this problem, the recording video data encoding process is started during the OPC process, and the generated data is temporarily stored in the buffer until the OPC process ends. A method of recording the stored data on a disk can be considered. However, since this method records audio along with video during OPC processing, there is a problem that mechanical operation sound accompanying OPC processing such as seek operation sound of optical pickup to PCA is recorded. It was.

  In Patent Document 1 described above, the optical pickup seek operation in the OPC process performed at the start of recording is reduced as much as possible by moving the optical pickup in advance to the address where the OPC process is performed before starting the recording. The mechanical operation sound due to the operation is suppressed. However, even with this method, there is a problem in that the seek operation from the PCA after the OPC processing to the recording start position is unavoidable and the operation sound is recorded.

  Accordingly, an object of the present invention is to provide a disk recording apparatus, a disk recording method, a disk recording program, and a recording medium that suppress the useless consumption of PCA and prevent the recording of mechanical operation sound associated with the OPC process at the start of recording. To provide a medium and an imaging apparatus.

  In order to solve the above-described problem, the first invention is an OPC (Optimum Power Control) process for an optical disc using a recording unit for recording data on the optical disc and a test writing area provided in the loaded optical disc. And a control unit that sets the recording power by the recording unit based on the result of the OPC process, and the control unit performs OPC according to the use status of the test writing area of the loaded optical disc. A disk recording apparatus characterized in that processing is executed.

  The second aspect of the invention controls to perform an OPC process on the optical disk using a test writing area provided on the loaded optical disk, and records data when recording data on the optical disk based on the result of the OPC process. The disk recording method is characterized in that power is set and an OPC process is executed in accordance with a use state of a test writing area of a loaded optical disk.

  The third aspect of the invention controls to perform an OPC process on the optical disk using a test writing area provided on the loaded optical disk, and records data when recording data on the optical disk based on the result of the OPC process. A disk recording program characterized by causing a computer device to execute a disk recording method for setting power and executing an OPC process in accordance with a use state of a test writing area of an optical disk loaded.

  According to a fourth aspect of the present invention, control is performed so that an OPC process is performed on an optical disk using a test writing area provided on the loaded optical disk, and recording is performed when data is recorded on the optical disk based on the result of the OPC process. A disc recording program is recorded which causes a computer device to execute a disc recording method for setting power and executing an OPC process in accordance with a use state of a test writing area of a loaded optical disc. The recording medium can be read by a computer device.

  According to a fifth aspect of the present invention, there is provided an image pickup unit that picks up light from a subject and outputs it as a video signal, a sound pickup unit that picks up sound and converts it into a sound signal, and outputs the sound signal. OPC processing is performed on the optical disc using a recording unit that records data based on the video signal and data based on the audio signal output from the sound collection unit on the optical disc, and a test writing area provided on the loaded optical disc. A control unit that controls the recording unit to perform and sets the recording power by the recording unit based on the result of the OPC process, and the control unit performs the OPC process according to the usage status of the test writing area of the loaded optical disc. This is an imaging apparatus characterized by executing the above.

  In the first to fourth inventions, as described above, control is performed so that the OPC process is performed on the optical disk using the test writing area provided on the loaded optical disk, and data is recorded on the optical disk based on the result of the OPC process. When the recording power of the optical disc is set and the OPC process is executed according to the usage status of the trial writing area of the loaded optical disc, when the trial writing area of the optical disc is large By performing OPC processing at the time of loading an optical disk, the response at the time of actual recording is improved. When the test writing area is small, the test writing area is wasted by performing OPC processing when actually starting recording. Not consumed.

  In addition, as described above, the fifth aspect of the invention captures light from the subject and outputs it as a video signal, a sound collection unit that collects sound and converts it into an audio signal, and outputs it, and at least imaging A recording unit that records data based on the video signal output from the recording unit and data based on the audio signal output from the sound collecting unit on the optical disc, and a test writing area provided on the loaded optical disc A control unit that controls the recording unit to perform the OPC process on the optical disc and sets the recording power by the recording unit based on the result of the OPC process, and the control unit uses the test writing area of the loaded optical disc Therefore, when there is a lot of test writing area on the optical disc, the OPC processing is performed by loading the optical disc when the optical disc is loaded. Recording of mechanical operation sound and the like is prevented and response of the recording operation is improved, and when the test writing area is small, the OPC process is performed when actually starting the recording, so that the test writing area is set. Don't waste it.

  As described above, according to the present invention, when the used amount of PCA is small, the OPC process is performed when the disk 2 is loaded into the disk drive 3. For this reason, when the used amount of PCA is small, the OPC process is performed prior to the recording start instruction by the user, and the OPC process is not performed after the recording start instruction is given by the user. There is an effect that the operation is not performed and the sound accompanying the seek operation is not recorded. At the same time, there is an effect that vibration associated with the seek operation during recording is eliminated.

  Further, since the OPC process is performed in advance when the disc is loaded and not performed during the recording, the response from the recording operation to the start of recording is accelerated.

  Furthermore, when the amount of used PCA is large, the OPC process is not performed when the disc is loaded. For example, it is possible to prevent unnecessary consumption of PCA due to repeated loading / discharging of the disc 2 without recording operation. effective.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of the configuration of a video camera apparatus 1 applicable to the present invention. The video camera device 1 records a video signal based on an imaging signal imaged by an imaging element such as a CCD (Charge Coupled Device), an audio signal collected along with the imaging, and the like on a recordable disc 2. It is what you do. As the disc 2, DVD-R (DVD Recordable), DVD-RW (DVD Re-recordable), DVD + R (DVD + R format), DVD + RW (DVD + RW format), etc. conforming to the DVD (Digital Versatile Disc) standard Are suitable for use.

  This video camera device 1 is obtained by a disk drive 3 that performs recording / reproduction with respect to the disk 2, a front controller 11 that is provided with various controls and receives user operations, an operation control signal corresponding to an operation input, imaging, and sound collection. HI control unit 12 that performs input / output control of video and audio signals, a camera unit 13 that captures light from a subject by an image sensor and outputs it as a video signal, a camera control unit 14 that controls the imaging operation of the camera unit 13, and a program Codec that performs compression encoding processing of video signals and audio signals and decompression processing of the compressed video signals and audio signals using the system control unit 15 that controls the overall operation of the video camera device 1 and the memory 23 Display unit 1 used as a viewfinder in which images captured by the processing unit 16 and the camera unit 13 are projected. , Having an audio processing unit 22 for performing predetermined processing on the audio signal outputted from the microphone (MIC) 21 and a microphone 21 for converting the audio signal picked up sound.

  The front control unit 11 is provided with various operators, display elements, and the like, and generates an operation control signal corresponding to an operation input by the user. The generated operation control signal is supplied to the HI control unit 12 described later.

  The camera unit 13 uses, for example, a CCD (Charge Coupled Device) as an imaging device, converts light incident from the subject into an electrical signal by photoelectric conversion, and obtains an imaging signal. Further, the camera unit 13 performs predetermined signal processing on the imaging signal and outputs it as a video signal. For example, the camera unit 13 performs a correlated double sampling process on the imaging signal to remove noise components, performs signal processing such as shading correction, masking correction, knee correction, γ correction, and contour compensation, The video signal is A / D converted and output as a digital video signal.

  The digital video signal output from the camera unit 13 is supplied to the camera control unit 14. Based on the supplied digital video signal, the camera control unit 14 performs imaging by the camera unit 13 such as mechanical shutter control, strobe control, camera shake correction, in addition to video signal processing control, zoom adjustment, pan / tilt adjustment, and focus adjustment in the camera unit 13. Various controls regarding. The digital video signal output from the camera control unit 14 is supplied to the codec processing unit 16 via the HI control unit 12 and the system control unit 15.

  The digital video signal output from the camera control unit 14 is also supplied to the display unit 17 having, for example, an LCD (Liquid Crystal Display) as a display element via the system control unit 15.

  The microphone 21 is built in the housing of the video camera device 1 and collects sound and converts it into an electrical signal during shooting to obtain an audio signal. The audio signal output from the microphone 21 is supplied to the audio processing unit 22, subjected to predetermined gain control, A / D converted, and converted into a digital audio signal. The audio processing unit 22 also performs noise reduction processing, sound quality correction processing, and the like on the digital audio signal. The digital audio signal output from the audio processing unit 22 is supplied to the codec processing unit 16 via the HI control unit 12 and the system control unit 15.

  The codec processing unit 16 temporarily stores the supplied digital video signal and digital audio signal in the memory 23. The memory 23 is used to compress and encode these digital video signal and digital audio signal. The compression-coded digital video signal and digital audio signal are stored in the memory 23 again.

  As a compression encoding method for digital video signals, for example, MPEG2 (Moving Pictures Experts Group 2) method can be applied. For example, AC3, AAC (Advanced Audio Coding), mp3 (Moving Pictures Experts Group 1 Audio Layer 3), ATRAC (Adaptive Transform Acoustic Coding), or the like can be applied to the digital audio signal. The digital audio signal can be omitted from compression encoding. The digital video signal and digital audio signal that have been compression-encoded and stored in the memory 23 are read out from the memory 23 with predetermined timing control and supplied to the system control unit 15.

  In addition, the compressed and encoded digital video signal and digital audio signal can be transmitted to other electronic devices via a USB (Universal Serial Bus) cable connected to the HI control unit 12. As a result, the video camera apparatus 1 can also monitor the imaging result and the reproduction result with the external device.

  The system control unit 15 time-division-multiplexes the digital video signal and digital audio signal supplied from the codec processing unit 16 and adds header information unique to the DVD, header information of an extension file, and the like. Furthermore, the system control unit 15 generates file system management information and predetermined data conforming to the DVD video standard such as VMG and VTIS. These data are supplied to the disk drive 3 as recording data.

  The disk drive 3 includes a recording / playback signal processing unit 20 and a drive control unit 19. The recording / reproducing signal processing unit 20 generates a recording signal by performing error correction encoding processing, recording encoding processing, modulation processing, and the like on the recording data, and records the recording data on the disc 2 by an optical pickup (not shown). To do.

  Further, the recording / reproducing signal processing unit 20 generates a focus error signal and a tracking error signal based on an output of an optical pickup (not shown). The drive control unit 19 controls the recording / reproducing operation with respect to the disc 2 and controls the focus drive, tracking drive, and sled drive of the optical pickup based on the focus error signal, the tracking signal, and the like generated by the recording / reproduction signal processing unit 20. To do.

  The HI control unit 12 transmits / receives various signals and information to / from the camera control unit 14 and the system control unit 15 via the bus and generates commands based on various operation control signals received from the front control unit 11. . The generated command is supplied to the system control unit 15 and each unit constituting the video camera device 1, and realizes the operation of the video camera device 1 in accordance with, for example, a user operation.

  For example, when a recording mode and a reproduction mode are designated by the user via the front control unit 11, an operation control signal to that effect is transmitted to the HI control unit 12. The HI control unit 12 identifies details of the designated mode based on the operation control signal, and transmits a predetermined control signal to the drive control unit 19 of the disk drive 3.

  The HI control unit 12 also executes DVD playback navigation control, data communication with other electronic devices via a USB interface, and the like.

  At the time of reproduction, the reproduction signal reproduced from the disk 2 is demodulated by the recording / reproduction signal processing unit 20, and further, decoding processing of the recording code and decoding processing of the error correction code are performed to generate reproduction data. The reproduction data is supplied to the system control unit 15. The system control unit 15 separates the playback digital video signal and the playback digital audio signal from the supplied playback signal, and also DVD standard such as DVD-specific header information, extended file header information, file system management information, VMG and VTIS. Separate the data according to. The reproduced digital video signal and the reproduced digital audio signal are supplied to the codec processing unit 16 and stored in the memory 23. The separated other data is stored in, for example, a RAM included in the system control unit 15.

  The codec processing unit 16 decodes the reproduction digital video signal and the compression code of the reproduction digital video signal to obtain a baseband digital video signal and a digital audio signal. The digital video signal and the digital audio signal are supplied to, for example, the HI control unit 12 and are output to the outside as a digital signal or D / A converted into an analog video signal and an audio signal.

  FIG. 2 shows an exemplary configuration of the disk drive 3. The disk drive 3 includes a spindle motor 32 that rotates the disk 2, a spindle motor driver 38 that generates a drive signal for driving the spindle motor 32 and supplies the drive signal to the spindle motor 32, and irradiates the disk 2 with a laser beam. In addition, the optical pickup 31 that receives the laser beam reflected by the disk 2, the sled motor 33 that moves the optical pickup 31 in the radial direction of the disk 2, and the biaxial mechanism (not shown) in the optical pickup 31 are driven and controlled. And a biaxial control unit 36.

  The disk drive 3 also includes an RF unit 34 that processes the output signal of the optical pickup 31, a signal processing unit 35 that generates various control signals based on the output of the RF unit 34, and a program stored in advance in a ROM (not shown). The microcomputer 39 that controls the entire disk drive 3 in accordance with the above, the nonvolatile memory 40 that can be rewritten and retains the written data even after the power is turned off, and the outside, that is, the system control described above. And an interface (I / F) unit 43 that controls communication with the unit 15.

  The disk drive 3 further includes a temperature sensor 41 and a shock sensor 42. The temperature sensor 41 detects the temperature in the disk drive 41 and supplies the detection result to the microcomputer 39. The shock sensor 42 detects an impact on the disk drive 42 and supplies the detection result to the microcomputer 39.

  In the spindle motor 32, a disk table for mounting the disk 2 is integrally attached to the drive shaft. Based on the drive signal supplied from the spindle motor driver 38, the drive shaft is, for example, a constant linear velocity (CLV: The disk 2 mounted on the disk table is rotated by being rotationally driven at a constant linear velocity (CAV) or constant angular velocity (CAV). The spindle motor driver 38 outputs a pulse corresponding to the rotation of the drive shaft.

  Although not shown, the optical pickup 31 includes a laser diode as a laser light source, a laser diode driver that drives the laser diode, and a laser beam emitted from the laser diode as a laser beam that is focused on the recording layer of the disk 2. And an optical system for detecting the laser beam reflected from the disk 2. The optical system is driven biaxially in the disk surface direction and the disk radial direction based on the drive signal supplied from the biaxial control unit 36, and focus and tracking are controlled.

  For example, the optical system irradiates the disk 2 by dividing one laser beam into three zero-order light and two first-order light using a grating or the like. The photodetector includes, for example, two two-divided detectors each having a light-receiving surface divided into two and a four-divided detector into which the light-receiving surface is divided into four, and the reflected light of each of the two primary lights is divided into two by the detector. In addition to receiving the light, one reflected light of the 0th order light is received by the four-divided detector, and detection signals corresponding to the light receiving surfaces are respectively output.

  Detection signals from the respective divided light receiving surfaces of the photodetector output from the optical pickup 31 are supplied to the RF unit 34. The RF unit 34 performs amplification processing on each supplied detection signal, performs a predetermined calculation between the signals, generates a focus error signal and a tracking error signal, and reflects the laser reflected from the disk 2. A reproduction RF signal corresponding to the light is generated. The focus error signal and the tracking error signal are supplied to the signal processing unit 35. Further, the reproduction RF signal is demodulated to a reproduction signal and supplied to the signal processing unit 35.

  Further, the RF unit 34 generates a light amount control signal for controlling the amount of laser light emitted from the optical pickup 31 to the disk 2 based on the signal supplied from the optical pickup 31, and the laser of the optical pickup 31. Supply to the diode driver. The RF unit 34 generates a light amount control signal for controlling the amount of laser light emitted from the optical pickup 31 to the disk 2 to be constant during reproduction, and is output from the signal processing unit 35 during recording. The level of the light quantity control signal is controlled according to the recording signal.

  The signal processing unit 35 is composed of, for example, a DSP (Digital Signal Processor) and corresponds to the recording / reproducing signal processing unit 20 described above. Further, the microcomputer 39 corresponds to the drive control unit 19 described above. At the time of reproduction, the signal processing unit 35 performs A / D conversion on the supplied reproduction signal based on the control of the microcomputer 39 and temporarily stores it in the storage unit 37. Then, the storage unit 37 is used to decode the recording code of the reproduction data and the decoding process of the error correction code. The decoded reproduction data is read from the storage unit 37 at a predetermined timing and supplied to the system control unit 15 via the I / F 43.

  At the time of recording, the signal processing unit 35 temporarily stores the recording data supplied via the I / F 43 in the storage unit 37, and uses the storage unit 37 to perform error correction encoding processing and recording code on the recording data. The process is applied. Then, a recording pulse is generated based on the recording data subjected to these processes, and is supplied to the optical pickup 31.

  Further, the signal processing unit 35 generates management information of data to be recorded on the disk 2 and temporarily stores it in the flash memory 40, for example. Then, for example, in accordance with an instruction from the microcomputer 39, the management information stored in the flash memory 40 is referred to, and each unit of the disk drive 3 is controlled so as to execute various reproduction methods such as random reproduction and shuffle reproduction.

  The focus error signal and tracking error signal supplied to the signal processing unit 35 are A / D converted, subjected to predetermined signal processing, and supplied to the biaxial control unit 36. The biaxial controller 36 controls the operation of the biaxial mechanism of the optical pickup 31 based on the supplied signal. The biaxial control unit 36 generates a drive signal for moving the optical pickup 31 to the designated track position on the disk 2 in accordance with a command from the microcomputer 39 and supplies the drive signal to the sled motor 33.

  FIG. 3 shows a schematic disk layout structure of the disk 2 in the DVD-R standard and the DVD-RW standard applicable to the embodiment of the present invention. In the DVD-R standard and the DVD-RW standard, a recording information management area (R-Information Area) is provided on the innermost periphery of the disc, and a data area (Information for use in recording user data) is provided outside the recording information management area. Area) is provided. In the recording information management area, a PCA (Power Calibration Area) and an RMA (Recording Management Area) are provided.

  The PCA is used for the disk drive 3 to perform a test for optimizing the laser power during recording. In the case of a DVD-R standard disc, for example, when one block is consumed for one OPC process, the PCA can perform the OPC process about 400 times. Further, in the case of a DVD-RW standard disc, when 8 blocks are consumed per OPC process, about 50 OPC processes can be performed. The number of possible OPC processes in PCA differs depending on the amount of use of one OPC process. The RMA records record management information such as power calibration information, recorder ID, and recording history. In the case of the unrecorded disc 2, no signal is recorded in the PCA and RMA.

  The data area is a lead-in area, a data area, and a lead-out area from the inner periphery side. In the lead-in area, information related to the disk 2 such as the format version, the disk type (DVD-R, DVD + R, DVD-RW, DVD + RW, etc.), the start and end sector numbers, and the like is recorded.

  In the DVD-R and DVD-RW, a groove wobbled at a predetermined frequency is formed in the recording layer of the disk 2 as a guide groove for guiding a laser beam for recording to a track. The space between the grooves is called a land. In the land, pits (land pre-pits) are embedded in advance according to a certain rule. The land prepit indicates address information at the time of recording and other information necessary for recording. The wobble generates a control signal for the spindle motor and a gate signal for detecting the land pre-pits, thereby detecting the land pre-pits with high accuracy, so that the address information of the unrecorded area of the disc 2 can be accurately obtained. I can know.

  In the above configuration, for example, the microcomputer 39 performs the OPC process corresponding to the disk 2 when the disk 2 is loaded into the disk drive 3 or when a recording instruction is given to the loaded disk 2. Control the whole. In the OPC process, for example, under the control of the microcomputer 39, the RMA of the loaded disk 2 is read, and based on the optimum recording power information written in the RMA, the recording power changed to a predetermined value from the optimum recording power information. A predetermined signal is written to the PCA. Then, this signal written in the PCA is read out, the asymmetry at each changed recording power is measured, and the optimum recording power in actual recording is found.

  Next, OPC processing according to an embodiment of the present invention will be described. In the present invention, the timing for performing the OPC process is changed according to the usage status of the PCA, for example, the usage amount already used. That is, when the disc is inserted into the disc drive 3, the amount of PCA used is checked. If the amount of PCA used is less than a predetermined value, the OPC process is executed as it is. Execute the process.

  In this way, when a new disk or a disk that is used less frequently is used, the OPC process is executed when the disk is inserted, and the mechanical operation sound or the like due to the OPC process is collected by the built-in microphone 21. Is prevented. Further, when a disc that has been used to some extent is used, OPC processing is performed at the time of recording, so that PCA is prevented from being wasted.

  The processing for the DVD-R standard disc will be described more specifically with reference to FIGS. FIG. 4 is a flowchart showing an example of processing when a disc is inserted according to the embodiment of the present invention. Each process in the flowchart of FIG. 4 is executed by, for example, the microcomputer 39 according to a predetermined program.

  When the disk 2 is inserted into the disk drive 3 in step S10 and loaded in a predetermined manner, the type of the disk 2 loaded in step S11 is determined. For example, the microcomputer 39 of the disk drive 3 issues a command for performing a focus search, and based on this command, the biaxial control unit 36, the optical pickup 31, the RF unit 34, the signal processing unit 35, and the like are controlled in a predetermined manner, so that the optical pickup 31 By irradiating the disk 2 with laser light, the reflected light is detected by a photodetector. The type of the loaded disc 2 is discriminated based on the detected amount of reflected light. That is, if the amount of light reflected from the disc is larger than a predetermined value, it can be discriminated as DVD-R, and if it is smaller, DVD-RW.

  When the type of the loaded disk is determined, servo adjustment is performed in the next step S12. For example, servo adjustment for each disk such as offset adjustment of the focus servo and tracking servo, gain adjustment for the output signal of the optical pickup 31, and correction for the inclination of the disk is performed. As a result, data can be written to and read from the disk 2.

  When various servos are adjusted in step S12, the process proceeds to step S13, and information on the loaded disk 2 is acquired. That is, the RMA of the disk 2 is accessed, and recording management information (RMD: Recording Management Data) recorded in the RMA is read. Based on the information acquired from the RMA, the type of the disc 2 (any one of DVD-R, DVD + R, DVD-RW, or DVD + RW), the usage history of the disc 2 and the like can be known.

  In the next step S14, the PCA is searched to find out to what part the PCA is used. For example, the PCA is searched while monitoring the reproduction RF signal of the optical pickup 31, and the final use address PCAddr which is the final address where the PCA is used is searched based on the change of the reproduction RF signal. As an example, a position where the amplitude of the reproduction RF signal becomes substantially zero is set as a final use address PCAddr. When the PCA last used address PCAddr is written in the RMA, this information may be used.

  This will be described more specifically with reference to FIG. FIG. 5 shows the disk layout described with reference to FIG. 3 in more detail with a focus on PCA. In the DVD-R standard, the range of physical address PSN (Physical Sector Number) = 0x1E800 to PSN = 0x203B0 on the disc is PCA, and the data area after PSN = 0x30000 is the data area. In the physical address notation, “0x” indicates that the subsequent numerical value is in hexadecimal notation.

  The PCA is used from the outer peripheral side to the inner peripheral side of the disk 2, that is, from the larger physical address to the smaller physical address. Therefore, in step S14, for example, the amplitude of the reproduction RF signal output from the optical pickup 31 is monitored while moving the optical pickup 31 from the position of PSN = 0x203B0 to PSN = 0x1E800, and the amplitude is substantially 0. Search for a position. In FIG. 5, it is assumed that the PCA has been used up to the shaded portion, and the innermost peripheral end of the shaded portion with respect to the disk 2 is the final use address PCAddr of the PCA.

  Note that the processing from step S10 to step S14 described above is always executed when the disk 2 is loaded in the disk drive 3.

  When the final use address PCAddr of the PCA is acquired in step S14, the acquired final use address PCAddr is compared with a predetermined physical address A in the PCA in the next step S15. The predetermined physical address A is, for example, PSN = 0x1F5E0, which is a substantially midpoint of PCA. The predetermined physical address A to be compared with the final use address PCAddr is not limited to the physical address at the midpoint of the PCA, but may be a physical address at another position.

  If it is determined in step S15 that the value of the last used address PCAddr is larger than the value of the predetermined physical address A, the process proceeds to step S16, and the OPC process is executed. That is, in this case, it can be determined that the PC 2 consumes relatively little PCA due to the past OPC process, and the OPC process is executed in advance when the disk 2 is loaded into the disk drive 3. The OPC process is performed by a well-known existing method.

  When the OPC process is executed, in the next step S17, the OPC flag is turned ON, indicating that the OPC process has been executed. The value of the OPC flag is stored in, for example, a register of the microcomputer 39, a RAM connected to the microcomputer 39, or the flash memory 40, and is initialized when the disk 2 is ejected. In step S18, the temperature when the OPC process is performed is measured by the temperature sensor 41. The measurement result is written into a RAM or flash memory 40 connected to the microcomputer 39, for example.

  On the other hand, if it is determined in step S15 that the value of the last used address PCAddr is smaller than the value of the predetermined physical address A, a series of processes according to the flowchart of FIG. In other words, in this case, it can be determined that a relatively large amount of PCA is consumed by the past OPC process, and the OPC process is not performed when the disk 2 is loaded into the disk drive 3, and the data is actually stored in the disk 2. OPC processing is performed when recording.

  FIG. 6 is a flowchart showing an example of processing when recording on the disk 2 is started according to the embodiment of the present invention. When recording of data to the disk 2 is instructed by a user operation, for example, with the disk 2 loaded in the disk drive 3, first, the OPC flag is referred to in step S20, and the disk 2 is loaded into the disk drive 3. Then, it is determined whether or not the OPC process has been executed for this disk 2.

  If the OPC flag is set to OFF, for example, a value indicating that the OPC process is not executed, this disk 2 has not been executed yet after the disk drive 3 is loaded. In step S23, the OPC process is executed. When the OPC process is executed, the OPC flag is turned ON in the next step S24, indicating that the OPC process has been executed. At this time, it is preferable to measure the temperature with the temperature sensor 41 and store the measurement result in a register or memory. Then, in the next step S25, data recording to the disk 2 is started.

On the other hand, if the OPC flag is ON in step S20, that is, if the value indicates that the OPC process has already been performed, the process proceeds to step S21, and the temperature sensor 41 measures the temperature. In step S22, the difference between the temperature measured last time and the temperature measured in step S21 is obtained as a temperature difference ΔT, and this temperature difference ΔT is compared with a predetermined value ΔT _th . The predetermined value ΔT _th is set to 40 ° C., for example.

If it is determined in step S22 that the temperature difference ΔT is smaller than the predetermined value ΔT _th , the process proceeds to step S25, and data recording on the disk 2 is performed without performing the OPC process. That is, if the temperature variation is small since the previous temperature measurement, it can be considered that the temperature dependent parameter value of the optical pickup 31 is also small, and the OPC process can be omitted.

If the temperature difference ΔT is larger than the predetermined value ΔT _th in step S22, the process proceeds to step S23, and the OPC process is executed. In this case, the temperature variation from the previous temperature measurement is large, and the value adjusted by the OPC processing performed at the previous temperature measurement may change with the temperature variation. I do.

  Thus, according to the present invention, when the used amount of PCA is small, the OPC process is performed when the disk 2 is loaded into the disk drive 3. Thus, for example, since the OPC process is not performed after the start of recording is instructed by the user, the seek operation to the PCA is not performed at the start of recording, and the sound accompanying the seek operation is not recorded. At the same time, vibration associated with the seek operation during recording is eliminated. Furthermore, since the OPC process is performed in advance when the disc is loaded and not performed during recording, the response from the recording operation to the start of recording is speeded up.

  Furthermore, when the amount of used PCA is large, the OPC process is not performed when the disc is loaded, so that wasteful consumption of PCA due to repeated loading / discharging of the disc 2 without recording operation can be prevented.

  In the above description, the determination as to when the OPC process is performed is described as being performed when the disk 2 is loaded in the disk drive 3, but this is not limited to this example. For example, when the operation mode of the video camera apparatus 1 is switched to the recording mode, it may be determined when to perform the OPC process. For example, in the flowchart of FIG. 4 described above, the operation mode is discriminated between step S14 and step S15, and if the current operation mode is the recording mode, the processing from step S16 is continued and data for the disc 2 is recorded. If, for example, the playback mode is not performed, a series of processing is terminated. That is, in this case, in the playback mode, even if the disk 2 is loaded in the disk drive 3, the OPC process is not performed.

  In the above description, the present invention has been described as being applied to the case where a recordable optical disc conforming to the DVD-R standard is used. However, this is not limited to this example, and the DVD-R standard disc and disc layout are used. The same applies to the DVD-RW standard disc, which is a rewritable disc. In a DVD-RW standard disc, since the dependence of the recording characteristics on the temperature of the optical pickup 31 is small, the OPC process may be performed only once when the disc is loaded or recorded.

  Furthermore, the present invention is also applicable to the case of using a recordable optical disc according to another standard such as the DVD + R standard, which has a different disk layout from the DVD-R standard.

  FIG. 7 schematically shows a disk layout of a recordable optical disk according to the DVD + R standard. In FIG. 7, attention is paid to portions related to the OPC process. In the DVD + R standard disc, an inner disc test zone (Inner Disc Test Zone), a count zone (Count Zone) and a TOC zone (Table Of Contents Zone) are arranged from the inner circumference side, and the lead-in area, Arranged with the data area. The inner disk test zone is an area corresponding to PCA in the DVD-R standard and the DVD-RW standard, and is used for OPC processing. The inner disk test zone has a physical address ranging from PSN = 0x23080 to PSN = 0x27080. As the inner disk test zone is used, “0” is written to the address of the count zone corresponding to the used address of the inner disk test zone.

  Also in the DVD + R standard, the inner disk test zone is used from the outer peripheral side to the inner peripheral side during the OPC process. Therefore, the predetermined physical address A ′ in the DVD + R standard corresponding to the predetermined physical address A described above is set to PSN = 0x23080 and PSN = 0x25080, which is the approximate middle point of PSN = 0x27080, and the inner disk test zone is used by OPC processing. The final address used is compared with the predetermined physical address A ′.

  As in the case of the DVD-R described above, if it is determined that the last used address is larger than the physical address A ′ and the consumption of the inner disk test zone due to the past OPC processing for this disk is small, the disk is loaded. OPC processing is sometimes performed. If the last used address is smaller than the physical address A ', OPC processing is performed during recording.

  In the DVD + R standard, an area corresponding to RMA in the DVD-R standard is an inner disk ID (Identification) zone included in the TOC zone and the lead-in area.

It is a block diagram which shows the structure of an example of the video camera apparatus applicable to this invention. It is a block diagram which shows the structure of an example of a disk drive. It is a basic diagram which shows the rough disc layout structure in DVD-R specification and DVD-RW specification. It is a flowchart which shows an example process at the time of the disc insertion by one Embodiment of this invention. It is a basic diagram which shows the disk layout in DVD-R standard and DVD-RW standard in detail, paying attention to PCA. It is a flowchart which shows an example of a process at the time of starting recording with respect to the disc by one Embodiment of this invention. It is a basic diagram which shows roughly the disk layout of the recordable optical disk by DVD + R specification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video camera apparatus 2 Disc 3 Disc drive 31 Optical pick-up 34 RF part 35 Signal processing part 36 2-axis control part 39 Microcomputer 41 Temperature sensor

Claims (10)

A recording unit for recording data on an optical disc;
The recording unit is controlled to perform OPC (Optimum Power Control) processing on the optical disc using a test writing area provided on the loaded optical disc, and the recording power by the recording unit is set based on the result of the OPC processing. And a control unit that
The disk recording apparatus according to claim 1, wherein the control unit executes the OPC process in accordance with a usage state of the test writing area of the loaded optical disk. The disk recording apparatus according to claim 1, wherein
The disk recording apparatus according to claim 1, wherein the usage status is an already used amount of the trial writing area. The disk recording apparatus according to claim 2, wherein
The control unit performs the determination when the optical disc is loaded,
If the used amount of the test writing area of the loaded optical disk is below a predetermined value, the OPC process is performed when the optical disk is loaded,
The disk recording apparatus according to claim 1, wherein the OPC process is performed when the recording is performed by the recording unit if the used amount of the test writing area of the loaded optical disk is a predetermined amount or more. The disk recording apparatus according to claim 2, wherein
Having at least a first operation mode in which data is recorded on the optical disc by the recording unit, and a second operation mode in which data is not recorded on the optical disc by the recording unit;
The control unit performs the determination when the first operation mode is entered,
If the used amount of the test writing area of the loaded optical disc is less than or equal to a predetermined amount, the OPC process is performed when the first operation mode is entered,
The disk recording apparatus according to claim 1, wherein the OPC process is performed when the recording is performed by the recording unit if the used amount of the test writing area of the loaded optical disk is a predetermined amount or more. The disk recording apparatus according to claim 1, wherein
A temperature detection unit for detecting the temperature in the apparatus
The control unit
After performing the OPC process on the optical disc, a flag indicating that the OPC process has been performed is stored, and the first temperature information is detected and stored in the temperature detection unit,
When data is recorded on the optical disc by the recording unit, if the flag indicates that an OPC process has been performed, the temperature detection unit detects second temperature information,
2. A disk recording apparatus according to claim 1, wherein the recording is performed after the OPC process if the difference between the first temperature information and the second temperature information is not less than a predetermined value. The disc recording apparatus according to claim 5, wherein
The disk recording apparatus according to claim 1, wherein the controller performs the recording without performing the OPC process if a difference between the first temperature information and the second temperature information is equal to or smaller than a predetermined value. Control is performed to perform OPC processing on the optical disc using a test writing area provided on the loaded optical disc, and a recording power for recording data on the optical disc is set based on a result of the OPC processing. And
A disk recording method characterized in that the OPC process corresponding to the usage state of the test writing area of the loaded optical disk is executed. Control is performed to perform OPC processing on the optical disc using a test writing area provided on the loaded optical disc, and a recording power for recording data on the optical disc is set based on a result of the OPC processing. And
A disk recording program for causing a computer apparatus to execute a disk recording method for executing the OPC process in accordance with the usage state of the test writing area of the loaded optical disk. Control is performed to perform OPC processing on the optical disc using a test writing area provided on the loaded optical disc, and a recording power for recording data on the optical disc is set based on a result of the OPC processing. And
Reading to a computer device, recorded with a disk recording program for causing the computer device to execute the disk recording method for executing the OPC process according to the usage state of the test writing area of the loaded optical disk Possible recording media. An imaging unit that images light from a subject and outputs it as a video signal;
A sound collection unit that collects sound, converts it into a sound signal, and outputs the sound signal;
A recording unit that records at least data based on the video signal output from the imaging unit and data based on the audio signal output from the sound collection unit on an optical disc;
A control unit configured to control the recording unit to perform an OPC process on the optical disc using a test writing area provided on the loaded optical disc, and to set a recording power by the recording unit based on a result of the OPC process; Have
The imaging apparatus according to claim 1, wherein the control unit executes the OPC process according to a use situation of the test writing area of the loaded optical disc.

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