JP2008243242A - Optical disk medium data erasing method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk medium data erasing method and device which are high in thermal efficiency and can apply a required amount of heat to the required positions to directly break a write-once optical disk medium to discard it without no security problems thereby eliminating the possibility of reproducing and completely erase the data on the metal and coloring matter layers. <P>SOLUTION: The recording layers are destroyed through a step of focusing the light beam from a light source using halogen, xenon, etc. on the recording layer in an optical disk medium, a step of heating the above recording layer with the above light beam spot, a step of radiating the optical disk medium while moving the above light beam spot from the inner area to the outer area, and a step of randomly deforming the optical disk medium. Thus, the optical disk medium is changed into a state impossible to read its data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a so-called discard-at-once write at once (including multi-layer type), CD-RW, DVD ± RW, normal data CD, DVD, music CD, video DVD, next-generation DVD (Blu-ray, HD DVD, etc.) The present invention relates to a data erasing method of an optical disk medium and a data erasing apparatus for disposing of the optical disk medium such as) by information and physical destruction and denying the possibility of reuse.

  Currently, write-at-once optical disc media include CD-R (Compact Disc Recordable), DVD-R (Digital Versatile Disc Recordable), and BD-R (Blu-ray Disc Recordable) and next-generation optical disc media. HD DVD-R (High-Definition DVD-R) has been proposed.

  When erasing data from these write-at-once optical disc media, it is common to cut the media with a technique of damaging the recording layer with a cutter having a sharp blade such as a cutter, or a shredder. In this case, the metal piece constituting the recording layer and the coloring matter containing harmful substances are scattered, which may affect the environment and the human body.

  Further, there is a security problem that the data part can be read by connecting the cut recording layers only by breakage or cutting.

  Further, as another method, data is overwritten in the management area and the data storage area, and the optical disk medium cannot be recognized or the data cannot be read. However, in this case, there is no change in the shape of the media from which the data was erased, so it is necessary to see the color change of the recording layer to see if it has been erased, but depending on the material of the recording layer, the color change is poor, There was a problem that it was impossible to visually determine whether or not it was erased.

  By the way, since the CD-R is formed in the order of the polycarbonate layer, the organic dye layer that is the recording layer, the metal layer, the protective film layer, and the printing label layer from the side irradiated with the laser, another method is conventionally known as CD-R. Data was erased from the CD-R media by applying heat to the -R label surface (the side closer to the recording layer).

  However, relatively new media such as DVD ± R and next-generation DVD-R have a problem that the recording layer is located in the middle of the two polycarbonate layers, so heat cannot be transferred from the surface to the inside and cannot be erased. It was.

  Also, in the case of DVD ± R (Digital Versatile Disc plus R, Digital Versatile Disc Recordable) etc., the recording layer is protected by a polycarbonate layer in the method of scratching and destroying the medium surface, the damaged portion is polished to polish the data. There was a problem that reading was possible.

  On the other hand, some proposals have already been made. For example, Patent Document 1 claims a method in which an optical disk is rotated by CLV (Constant Linear Velocity) in the normal recording direction and then heated by light. is doing.

  Patent Document 2 discloses a technology that makes it difficult to read existing data by creating new pits (information) by irradiating a laser and obscuring previous data. Furthermore, a technique for disabling the disc itself by creating new pits (information) in an unrecorded area is disclosed.

  In addition, Patent Document 3 discloses a technique in which heat is applied to the printed label surface of the CD-R from the upper surface at 80 to 150 degrees Celsius to cause a thermal change around the data pits.

JP 2000-222741 A JP 2002-304736 A JP-A-10-214424

  However, since Patent Document 1 employs CLV, a mechanism for absorbing the difference between the circumferential lengths of the inner and outer peripheral portions of the disk is first required. Next, since the disk is always rotating during heating, the heating point is easily cooled, and in order to destroy the recording layer, a large amount of energy exceeding the cooled energy is required, and it is found that the thermal efficiency is poor. ing. Furthermore, if sufficient energy is applied to destroy the recording layer, heat will accumulate on the entire circumference of the rotating disk, and the circumference will be shorter and the rotation speed will increase, especially on the inner circumference. Although the temperature is about 150 ° C., it is softened due to the high temperature, and the entire circumference may be deformed by gravity, resulting in a dangerous state. In other words, the deformation hangs down as a whole, causing serious damage to the mechanism. Therefore, there is a need for a system with good thermal efficiency without such deterioration of thermal efficiency.

  In Patent Document 2, the disk is not directly destroyed, and the dye material of the recording layer and the disk substrate itself are not destroyed. For this reason, there is a problem that there is no possibility of being reproduced in some form.

  Furthermore, in Patent Document 3, 80 to 150 ° C. is the heat resistant temperature of the disk-based polycarbonate. For this reason, 300 to 400 ° C. is a temperature at which no damage is given to the dye in the recording layer. Further, although this technique is effective for CD-R, in DVD ± R, there is a high possibility that the dye cannot be damaged because the dye is located at the center in the thickness direction of the medium.

  Therefore, an object of the present invention is to discard the write-at-once optical disc media to be discarded without having a security problem, so that the heat efficiency is high and the necessary amount of heat can be directly applied to a necessary portion. An object of the present invention is to provide a data erasing method and a data erasing apparatus for an optical disc medium that completely destroys data such as a metal layer and a dye layer by destroying the disc and eliminating the possibility of reproduction.

  In order to solve the above problems, an optical disc media data erasing method according to the present invention comprises irradiating a recording layer in an optical disc medium with a light beam spot, heating the recording layer with the light beam spot, Optical disk media that may affect the surrounding environment and the human body by irradiating a light beam spot while moving the optical disk media from the inner periphery to the outer periphery, and by randomly deforming the optical disk media By destroying the recording layer without scattering the metal pieces or the dye of the recording layer, the optical disc medium is made in a state in which the data cannot be read.

  Further, the optical disk medium may be deformed in the thickness direction to such an extent that the optical disk medium cannot be inserted into a playback device by random deformation of the optical disk medium.

  Further, the optical disk medium may be deformed to such an extent that it can be clearly distinguished from the non-irradiated optical disk medium by random deformation of the optical disk medium.

  In addition, the metal layer constituting the optical disk medium may be destroyed, and the resin layer adjacent to the metal layer may be foamed so that the optical disk medium cannot read the data.

  Subsequently, the movement of the light beam spot is performed from the inner circumference to the outer circumference and from the outer circumference to the inner circumference, and by rotating the optical disk media, the surrounding environment and By destroying the recording layer without scattering the metal pieces of the optical disk medium that may affect the human body or the dye of the recording layer, the optical disk medium is made in a state in which the data cannot be read. Also good.

  Next, the movement of the light beam spot is performed from the inner periphery to the outer periphery and from the outer periphery to the inner periphery, and by rotating the optical disc media, a part of the entire circumference is surrounded. It is impossible to read the data of the optical disc media by destroying the recording layer without scattering the metal pieces of the optical disc media and the dye of the recording layer, which may affect the environment and human body. It may be in a state.

  Subsequently, when the light beam spot is irradiated while moving in the radial direction from the inner periphery to the outer periphery of the optical disc medium, at least one spot is irradiated over the entire data area existing in the radial direction. Also good.

  In addition, when the light beam spot is irradiated while moving in the radial direction from the inner periphery to the outer periphery of the optical disk medium, the ratio of the irradiation area to the entire periphery is corrected by correcting the data recorded on the optical disk. You may irradiate more than the extent which becomes impossible to reproduce with a flag.

  In order to solve the above problems, an optical disc media data erasing apparatus according to the present invention comprises a light beam spot portion for condensing a light beam using halogen, xenon, or the like as a light source on a recording layer in the optical disc media, and the light A light beam output control unit that heats the recording layer with a beam spot; and a light beam drive control unit that irradiates the light beam spot while moving the light beam spot from an inner periphery to an outer periphery of the optical disc medium. By randomly deforming the recording layer without destroying the metal pieces of the optical disk medium that may affect the surrounding environment or the human body or the dye of the recording layer, The data may not be read.

  Furthermore, the optical disk medium may be deformed in the thickness direction to such an extent that the optical disk medium cannot be inserted into a playback device by random deformation of the optical disk medium.

  In addition, the optical disk medium may be deformed to such an extent that it can be clearly distinguished from the non-irradiated optical disk medium by random deformation of the optical disk medium.

  Subsequently, the optical disk medium is destroyed by destroying the metal layer, or by foaming the resin layer adjacent to the metal layer, or by destroying the metal layer and foaming the resin layer adjacent to the metal layer. The medium may be made in a state where it cannot read the data.

  Next, the movement of the light beam spot is performed from the inner periphery to the outer periphery and from the outer periphery to the inner periphery, and by rotating the optical disc media, the surrounding environment and By destroying the recording layer without scattering the metal pieces of the optical disk medium that may affect the human body or the dye of the recording layer, the optical disk medium is made in a state in which the data cannot be read. Also good.

  Further, the movement of the light beam spot is performed from the inner circumference to the outer circumference and from the outer circumference to the inner circumference, and by rotating the optical disc media, a part of the entire circumference is The optical disc media cannot be read by destroying the recording layer without scattering the metal pieces of the optical disc media that may affect the environment or the human body or the dye of the recording layer. It may be.

  By adopting the optical disk media data erasing method according to the present invention, the method of applying heat by focusing on the recording layer of the data storage area in the optical disk media with a light beam spot may affect the environment and the human body. By destroying the recording layer without scattering a certain metal piece or dye of the recording layer, the data cannot be read.

  In addition, using a method of applying heat by focusing on the recording layer in the data storage area in the optical disk medium with a light beam spot, the recording layer is destroyed and at the same time, the heat itself is used to randomize the medium itself, mainly the polycarbonate layer. By making the deformation, it is possible to easily determine whether or not the disk has been erased at the same time that it cannot be inserted into the optical disk drive.

  Furthermore, the recording layer (CD / DVD / next-generation DVD (HD DVD, Blu-ray, etc.) / CD-RW / DVD ± RW in the case of the data storage area in the optical disk medium by the light beam spot, the metal layer, and write-at-once In this case, a method of applying heat by focusing on the dye layer), destroying the recording layer itself, generating bubbles in the polycarbonate layer, and randomly deforming the medium mainly composed of the polycarbonate layer, It is possible to make a state in which data cannot be read and a state in which it cannot be inserted into the optical disk drive.

  In addition, since this method is not CLV, there is no need to control the linear velocity during rotation, and there is no adverse effect due to heat accumulation in the inner periphery during rotation.

  Further, in the present method, when the light beam spot is irradiated while moving in the radial direction from the inner periphery to the outer periphery of the optical disc medium, the light beam spot is overlapped with the previous irradiation region and the current irradiation region. Scanning has the effect of less heat diffusion.

  In addition, the present method does not rotate the optical disk when irradiating the light beam spot while moving the optical beam spot in the radial direction from the inner periphery to the outer periphery of the optical disk medium. Difficult to occur.

  Hereinafter, embodiments of the present invention will be described using a plurality of examples.

  In addition, this invention is not limited to said embodiment, Embodiment can be changed suitably within the range of the technical idea of this invention.

  Next, the configuration of the embodiment of the present invention will be described in detail with reference to the drawings. Referring to FIG. 1, an optical disk media data erasing apparatus 10 using a light beam spot according to the present embodiment includes a light beam spot unit 100, a media slot 101, a media storage unit 102, and a media rotation unit, which are the next 17 blocks. 103, media rotation control unit 104, light beam output control unit 105, light beam drive unit 106, position sensor unit 107, light beam drive control unit 108, CPU 109, memory unit 110, operation mode DB 111, start SW 112, and operation mode selection SW 113. The operation mode display unit 114, the power supply unit 115, and the temperature sensor unit 116 are all arranged in the same housing 12 (not shown).

  These are centered on the CPU 109, the media insertion port 101 is electrically coupled to the media storage unit 102, the media storage unit 102 is electrically coupled to the media rotation unit 103, and the media rotation unit 103 is coupled to the media rotation control unit 104. The media rotation control unit 104 is electrically coupled to the CPU 109.

  Further, the light beam spot unit 100 is electrically coupled to the light beam output control unit 105, the light beam output control unit 105 is electrically coupled to the light beam driving unit 106, and the light beam driving unit 106 is coupled to the position sensor unit 107. The position sensor unit 107 is electrically coupled to the light beam drive control unit 108, and the light beam drive control unit 108 is electrically coupled to the CPU 109.

  Further, the memory unit 110 and the temperature sensor 116 are electrically coupled to the CPU 109.

  On the other hand, the start SW 112 is electrically coupled to the operation mode selection SW 113, the operation mode selection SW 113 is electrically coupled to the operation mode display unit 114, and the operation mode display unit 114 is electrically coupled to the operation mode DB 111 and the CPU 109. To do. The power supply unit 115 is connected to all blocks and to an AC power supply.

  The operation of the optical disk media data erasing apparatus 10 will be briefly described below.

  Optical Disc Media Using Light Beam Spot The data erasing apparatus 10 stores the optical disc media in the media storage unit 102 when the optical disc media is inserted, and displays that the optical disc media is inserted in the operation mode display unit 114.

  Optical Disc Media Using Light Beam Spot In the data erasing apparatus 10, an optical disc media is stored in the media storage unit 102. When the start SW 112 is pressed while the operation mode is set in this state, the CPU 109 discriminates the selected operation mode, and sets the operation parameter for each designated operation mode (media type, erase mode type). On the basis of the erase operation.

  In the optical disk media data erasing apparatus 10 using the light beam spot, when the complete erasure mode is selected, the CPU 109 outputs the light beam spot output (12V as an example) in the operation mode DB 111 for each type of the corresponding optical disk medium, and Optical beam drive operating speed (6 seconds / edge as an example), rotation angle at the outermost circumference (8 degrees as an example), rotation angle at the innermost circumference (8 degrees as an example), and optical disk media surface temperature (As an example, 250 degrees) is read and written into the memory unit 110.

  Thereafter, the CPU 109 sends an output start signal to the light beam output control unit 105 to start the output of the light beam.

  At the same time, the CPU 109 continuously measures the temperature of the optical disk medium surface by following the light beam driving unit 106 by the temperature sensor unit 116, periodically reads the temperature of the medium surface, writes it in the memory unit 110, and monitors it.

  When the surface temperature becomes higher than a preset temperature, the CPU 109 transmits an output reduction signal for reducing the output of the light beam spot unit 100 to the light beam output control unit 105.

  Conversely, when the surface temperature becomes lower than a preset temperature, the CPU 109 transmits an output increase signal for increasing the output of the light beam spot unit 100 to the light beam output control unit 105.

  The CPU 109 sends a control signal for moving the light beam spot unit 100 from the innermost circumference to the outermost circumference of the optical disk medium while keeping the surface temperature constant within a certain time (for example, within 10 seconds). Send. After this movement, the CPU 109 rotates the optical disk medium by a predetermined angle, and transmits a control signal to the light beam drive control unit 108 to move the light beam spot unit 100 from the outermost periphery to the innermost periphery while irradiating the light beam.

  After the movement, the CPU 109 transmits a control signal for rotating the optical disk medium by a predetermined angle to the media rotation control unit 104. The CPU 109 repeats these series of operations, and transmits a control signal for continuing the optical disk medium until it rotates once, to the media rotation control unit 104, the light beam output control unit 105, and the light beam drive control unit.

  Finally, the CPU 109 transmits a control signal for stopping the output of the light beam spot unit 100 to the light beam output control unit 105. Simultaneously with this stop, the result is displayed on the operation mode display unit 114 (“complete erase complete” display as an example).

  In the optical disk media data erasing apparatus 10 using the light beam spot, when the simple erasing mode is selected, the CPU 109 outputs the light beam spot output (10 V as an example) and the light in the operation mode DB 111 for each type of the corresponding optical disk medium. Reads the operating speed of the beam drive unit (between 4.5 seconds / edge as an example), the rotation angle at the outermost circumference (8 degrees as an example), and the rotation angle at the innermost circumference (52 degrees as an example) Write to part 110.

  Thereafter, the CPU 109 sends a drive start signal to the light beam driving unit 106 to start output of the light beam spot.

  The CPU 109 transmits a control signal for moving the light beam spot unit 100 from the innermost periphery to the outermost periphery to the light beam drive control unit 108. After the movement, the CPU 109 transmits a control signal for rotating the optical disk medium by a certain angle to the light beam rotation control unit 104 to rotate the optical disk medium by a certain angle, and then the light beam spot unit 100 irradiates the light beam while irradiating the light beam. A control signal for moving from the outer periphery to the innermost periphery is transmitted to the light beam drive control unit 108.

  After the movement, the CPU 109 transmits a control signal for rotating the optical disk medium by a predetermined angle to the media rotation control unit 104. The CPU 109 repeats these series of operations, and transmits a control signal for continuing the optical disk medium until it rotates once, to the media rotation control unit 104, the light beam output control unit 105, and the light beam drive control unit.

  Finally, the CPU 109 transmits a control signal for stopping the output of the light beam spot unit 100 to the light beam output control unit 105. Simultaneously with this stop, the result is displayed on the operation mode display unit 114 (for example, “simple erasure complete” is displayed).

  Next, each component will be described.

  The light beam spot unit 100 is a light beam spot heater that brings out a hot spot at the focal position by condensing light generated from a high-output light beam light source using a spheroid curved reflector or the like. Halogen, xenon, or the like is used as the light source. The light beam spot unit 100 concentrates a light beam using halogen, xenon, or the like as a light source on the recording layer in the optical disk medium to raise the temperature to destroy the recording layer, and to randomly deform the optical disk medium itself. Used when.

  The media slot 101 is a slot that is opened in the housing 12. It is used when optical disc media are stored in the media storage unit 102 or ejected from the media storage unit 102.

  The media storage unit 102 includes a media storage tray for mounting and processing the media, and a tray driving unit for transferring the tray to the outside and mounting and moving the media. This media storage unit 102 is used when storing optical disk media from the media insertion slot 101 into the drive.

  The media rotation unit 103 includes a motor such as a stepping motor whose rotation can be controlled by the media rotation control unit 104. The media rotation unit 103 is used when rotating the optical disk medium.

  The media rotation control unit 104 is a motor control circuit of the media rotation unit 103 and controls the rotation angle and the angular velocity. A control signal for controlling the media rotation unit 103 to rotate to a designated angle is transmitted.

  The light beam output control unit 105 is a control circuit that controls the light beam spot unit 100. Furthermore, it has a function of performing output control of the light beam spot, ON / OFF control, and the like.

  The light beam driving unit 106 is a carriage that moves the light beam spot unit 100 and the temperature sensor unit 116. The light beam driving unit 106 is used when the light beam spot unit 100 and the temperature sensor unit 116 are moved to positions designated by the light beam driving control unit 108.

  The position sensor 107 is a micro switch for confirming the position of the light beam driving unit 106. When the microswitch is turned ON / OFF, it is detected that the light beam driving unit is close to or away from the specified position. The position sensor 107 has a function of detecting the innermost circumference position and the outermost circumference position of the optical disc medium. A plurality of sensors are provided for each detection position.

  The light beam drive control unit 108 is a control circuit for the light beam drive unit 106. A stepping motor or the like for moving the light beam is controlled and controlled based on a signal from the position sensor 107. It is used when performing control so that the light beam driving unit 106 can move to a designated position.

  The CPU 109 is a central processing unit composed of a microprocessor or the like, and includes a media insertion slot 101, a media storage unit 102, a media rotation control unit 104, a light beam drive control unit 108, a memory unit 110, an operation mode display unit 114, The temperature sensor unit 116 and the like are controlled.

  The memory unit 110 is a semiconductor storage device such as a RAM and a ROM that can be directly read and written by the CPU 109, and is used to store operation parameters at the time of complete erasure and simple erasure, position information from each control unit, and the like.

  The operation mode DB 111 includes an operation mode (type of optical disc medium and erasure mode) and parameters necessary for each operation mode (for example, light beam spot output, light beam driving unit operation speed, innermost circumference, and rotation angle at the outermost circumference). , Media surface temperature, etc.) are linked to form a database and stored in the memory unit 110 when operating in each operation mode. The data contents are shown in Table 1.

  The start SW 112 is a switch using a push button or the like, and is used when executing each operation mode such as a complete erase mode and a simple erase mode. The operation mode selection SW 113 is a switch using a push button or the like, and is used when selecting an operation mode.

  The operation mode display unit 114 is a display circuit such as a 7-segment LED or a liquid crystal display, and is used to monitor the state of the start SW 112 and the operation mode selection SW 113 and display the operation mode and the operation result.

  The power supply unit 115 is a power supply that converts AC input to DC, and supplies power to each module as a DC power supply.

  The temperature sensor unit 116 is a temperature sensor that can measure a high temperature (for example, a maximum of 600 degrees). The temperature sensor unit 116 is used when the light beam driving unit 106 measures the temperature of the optical disk media surface at the light beam output position.

  Next, the operation of the present invention will be described in more detail with reference to FIGS.

  First, the optical disk media data erasing apparatus 10 using the light beam spot will be described with reference to the flowchart of FIG. 2. When the operator operates the operation mode selection SW 113, the selection signal of the operation mode selection SW 113 is transmitted to the CPU 109. . The CPU 109 reads data indicating the operation mode into the built-in register and transmits a new operation mode selection signal to the operation mode display unit 114 to change the display of the new operation mode (step A1).

  After the change of the operation mode, the CPU 109 enters a media standby state. When the optical disk medium is inserted into the medium insertion slot 101 by the operator, the media detection sensor detects the optical disk medium and proceeds to the next process (step A2 Yes). If the optical disk medium is not detected, the medium standby state is maintained (No in step A2).

  The media storage unit 102 stores the optical disk media in the media storage unit 102. When the media detection sensor detects the optical media, the CPU 109 that has received the detection signal sends a signal to the operation mode display unit 114 to indicate “Ready”. Display (step A3).

  In the optical disk media data erasing apparatus 10 using the light beam spot, the start SW 112 is pressed by the operator while the operation mode is selected and the optical disk medium is stored in the media storage unit 102 (step A4).

  Subsequently, the operation mode is awaited (step A5). The CPU 109 waits for selection of an operation mode (step A6).

  The type of the optical disk medium (DVD ± R, HD DVD-R, Blu-ray-R, CD-R, etc.) set in step A1 in response to the pressing signal of the start SW 112 is set, that is, DVD ± R. Is selected, the operation parameters necessary for the corresponding operation mode are stored in the memory unit 110 from the operation mode DB 111 (step A7). The same applies to HD DVD-R, Blu-ray-R, CD-R, etc. in addition to DVD ± R.

  Next, it waits for an instruction for the erase mode (step A8).

  In addition, the CPU 109 identifies selection information such as an operation mode such as an erase mode (for example, a complete erase mode or a simple erase mode) (step A9).

  The CPU 109 stores the operation parameters and the erasing method necessary for the corresponding operation mode from the operation mode DB 111 according to the identified parameters in the memory unit 110, and starts the erasing operation in the corresponding operation mode (Step A10, Step B1). .

  Referring to FIGS. 3 and 4 in more detail, according to the flowchart of the erasing method according to the present invention shown in FIG. 3, the optical disk media data erasing apparatus 10 using the light beam spot has the erasing method in the complete erasing mode ( In the case of steps B2 and B3), the output of the light beam spot unit 100 is started at a voltage specified based on the operation parameter stored in the memory unit 110 (step B4).

  Optical disk media using light beam spot The data erasing apparatus 10 uses the light beam driving unit 106 to move the light beam spot unit 100 from the innermost circumference position to the outermost circumference of the optical disc medium. As 10 seconds / the movement time between the innermost circumference and the outermost circumference) (step B5). By making the moving speed constant, the control is simple and the stability of the operation is improved. Moreover, when irradiating from the innermost periphery position to the outermost periphery, it is necessary to irradiate the entire radius along the radial direction. This is because if there is a leak, there is a possibility that data that is not destroyed may occur. Specifically, as shown in FIG. 4A, the light beam spot portion 100 is irradiated in the direction of the arrow.

  The light beam is focused on the recording layer in the optical disk medium. The temperature rises according to the concentration of light, and as a result, the media is deformed randomly.

  Optical Disc Media Using Light Beam Spot In the data erasing apparatus 10, while the light beam is being output from the light beam spot unit 100, the CPU 109 follows the light beam driving unit 106 by the temperature sensor unit 116 and the surface of the optical disc medium is The temperature is continuously measured and stored in the memory unit 110 to monitor the temperature of the media surface. Here, when the surface temperature becomes higher than a preset temperature, the CPU 109 sends a signal for decreasing the output of the light beam spot unit 100 to the light beam output control unit 105, and conversely, the surface temperature becomes lower. In this case, the CPU 109 transmits a signal for increasing the output of the light beam spot unit 100 to the light beam output control unit 105. The surface temperature is kept constant within a certain time (for example, within 10 seconds) (step B6, step B7).

  In the optical disk media data erasing apparatus 10 using the light beam spot, if the temperature measured by the temperature sensor unit 116 of the optical disk medium does not return to the specified temperature within a certain time, the CPU 109 outputs the light beam to the light beam output control unit 105. Is transmitted to the operation mode display unit 114. Finally, the operation result (“temperature abnormality” as an example) is displayed. Thereafter, the optical disk medium is moved from the media storage unit 102 to the media insertion slot 101 by the media storage unit 102 (step B8).

  When the optical beam spot unit 100 detects that the optical beam spot unit 100 has moved to the outermost peripheral position of the optical disc medium by the position sensor 107 (step B9), the optical disk media data erasing apparatus 10 using the optical beam spot is stored in the memory unit 110. The optical disk medium is rotated by the stored rotation angle (8 degrees as an example) (step B10) (see FIG. 4- (b) as an example of operation).

  Here, it is preferable to set the rotation angle slightly smaller than the irradiation diameter when the beam spot is on the outermost periphery. By setting this rotation angle, the entire circumference of the optical disk medium can be irradiated. Furthermore, by setting the rotation angle slightly smaller than the irradiation diameter at the outermost periphery, it is possible to irradiate the beam spot so as to partially overlap with the previously irradiated portion when moving the beam spot in the radial direction.

  Next, the optical disk media data erasing apparatus 10 using the light beam spot moves the light beam spot unit 100 from the outermost peripheral position of the optical disk medium to the innermost periphery by the light beam driving unit 106. (Step B11) (see FIG. 4- (c) as an example of operation). When the optical beam spot unit 100 detects that the optical beam spot unit 100 has moved to the innermost peripheral position of the optical disc medium by the position sensor 107 (step B12), the data erasing device 10 using the optical beam spot in the memory unit 110 The optical disk medium is rotated by the rotation angle stored in (for example, 8 degrees in the complete erasure mode) (step B13) (see FIG. 4- (d) as an example of operation).

  In the complete erasing mode, the optical disk media data erasing apparatus 10 using the light beam spot repeats steps B5 to B10 until the medium rotates once (step B14), and then stops the output of the light beam spot unit 100, Finally, after displaying the operation result (for example, “complete erasure complete”) on the operation mode display unit 114, the optical disk medium is moved from the medium storage unit 102 to the media insertion slot 101 by the media storage unit 102 (step B15) (FIG. B15). 5 shows an example of an optical disk medium at the time of erasing in the complete erasing mode).

  With the above configuration, the optical disc media can be stored in its data by destroying the recording layer without scattering the metal pieces of the optical disc media that may affect the surrounding environment or the human body or the dye of the recording layer. Can not be read.

  Further, random deformation of the optical disk medium makes it possible to deform the optical disk medium in the thickness direction to the extent that it cannot be inserted into the playback device, and there is no need to re-deform the deformed disk.

  Furthermore, since the optical disk medium can be deformed to such an extent that it can be clearly distinguished from the non-irradiated optical disk medium by random deformation of the optical disk medium, it is not necessary to determine the deformation.

  In addition, the recording layer of the optical disk medium is used to destroy the metal layer constituting the optical disk medium and foam the resin layer adjacent to the metal layer so that the optical disk medium cannot read the data. The optical disk can be reliably destroyed by destroying and generating bubbles in the polycarbonate layer.

  On the other hand, the case where the simple erasing method is selected as the erasing method is shown below.

  When the erasing method is the simple erasing mode (steps B2 and B3 ′), the output of the light beam spot unit 100 is started at a voltage specified based on the operation parameters stored in the memory unit 110 (step B4 ′). ).

  Optical disk media using light beam spot The data erasing apparatus 10 uses the light beam driving unit 106 to move the light beam spot unit 100 from the innermost circumference position to the outermost circumference of the optical disc medium. (Step B5 ′) (FIG. 4- (a) is shown as an example of the operation).

  Optical Disc Media Using Light Beam Spot The data erasing apparatus 10 uses the temperature sensor unit 116 to follow the light beam driving unit 106 and adjust the temperature of the optical disc media surface while the light beam is output from the light beam spot unit 100. Continuously measure and monitor the temperature of the media surface. If the surface temperature becomes higher than the set temperature, the output of the light beam spot unit 100 is lowered by the light beam output control unit 105, and the surface temperature becomes low. In this case, the output of the light beam spot unit 100 is increased by the light beam output control unit 105, and the surface temperature is kept constant within a certain time (for example, within 10 seconds) (step B6, step B7).

  The optical disk media data erasing apparatus 10 using the light beam spot stops the output of the light beam by the light beam output control unit 105 when the temperature of the optical disk medium does not return to the specified temperature within a predetermined time, and finally displays the operation mode. After the operation result (“temperature abnormality” as an example) is displayed on the unit 114, the optical disk medium is moved from the medium storage unit 102 to the media slot 101 by the media storage unit 102 (step B8).

  When the optical beam spot unit 100 detects that the optical beam spot unit 100 has moved to the outermost peripheral position of the optical disc medium by the position sensor 107 (step B9 ′), the data erasing device 10 using the optical beam spot in the memory unit 110 The optical disk medium is rotated by the rotation angle (8 degrees as an example) stored in (Step B10 ′) (FIG. 4- (b) is shown as an example of the operation).

  Next, the optical disk media data erasing apparatus 10 using the light beam spot moves the light beam spot unit 100 from the outermost peripheral position of the optical disk medium to the innermost periphery by the light beam driving unit 106. (Step B11 ′) (FIG. 4- (c) is shown as an example of the operation). When the optical beam spot unit 100 detects that the optical beam spot unit 100 has moved to the innermost peripheral position of the optical disc medium by the position sensor 107 (step B12 ′), the memory unit 110 The optical disk medium is rotated by the rotation angle stored therein (for example, 52 degrees in the simple erase mode) (step B13 ′) (FIG. 4- (d) is displayed as an example of the operation). Here, by setting the angle to 52 degrees, six irradiation lines are provided on the optical disc medium, and irradiation can be completed in a short time. In the error rate, if there is an error of 2 bytes or more in one frame, it cannot be corrected. Therefore, if there is an unreadable portion of 6% or more of this area, it cannot be reproduced. Therefore, data reproduction can be sufficiently prevented if the ratio is one per rotation angle of 52 degrees.

  The optical disk media using the light beam spot The data erasing apparatus 10 repeats the steps B5 ′ to B10 ′ until the medium rotates once (step B14 ′), then stops the output of the light beam spot unit 100, and finally After displaying the operation result (for example, “simple erasure complete”) on the operation mode display unit 114, the optical disk medium is moved from the medium storage unit 102 to the media insertion slot 101 by the media storage unit 102 (step B15 ′). FIG. 6 shows an example of an optical disk medium at the time of erasing in the simple erasing mode. Here, the instruction number 118 is an optical disk medium, 120 indicates an irradiated part, and 122 indicates an unirradiated part.

  As described above, in the present embodiment, a method called a radial scan that moves the heating point radially from the center of the optical disk to the outer peripheral portion without rotating the disk during heating is devised and adopted. It is possible to prevent a point that must be a mechanism and a fatal deformation due to heat accumulation in the inner peripheral portion.

  In these embodiments, since the heating performed at the first reciprocation can be used as the subsequent preheating, the preheating can be performed without any special mechanism.

  Further, in this embodiment, scanning is performed while overlapping a small area, so that heat diffusion is small and thermal efficiency is very good.

  In addition, since it does not rotate at all times, heat conduction to the opposite side of the disk hardly occurs, and the entire disk does not deform at a time. Even in that case, the deformation occurs only in the heated radial straight line, but since it is sent sequentially, it has an effect that it gradually cools and does not reach a fatal deformation.

  Next, it is also possible to reduce the number of scans per sheet by widening the radial scan step interval and adopt a simple erasing method. Further, since radial deformation occurs after scanning, the difference between the erased disk and the normal disk is easy to understand visually. Even this simple type breaks the continuity of the recorded data, so that sufficient secrecy can be obtained. This is because data is not continued in the circumferential direction.

  Finally, since the heating point always moves in a narrow range at the same speed, the control as a system is simple and the operation stability is high.

  In this embodiment, heating is performed with a light beam of about 500 ° C. to 800 ° C. at the focal point to directly destroy the dye layer and the disk substrate inside the disk.

  Note that the angles 8 degrees and 52 degrees shown in the present embodiment are values determined by the size of the beam spot in the present embodiment, and are not limited to these angles.

  By implementing the present invention, it is possible to improve data security, which has been a problem when discarding a conventional optical disc, and to meet various requirements.

1 is a block diagram of an optical disk media data erasing apparatus for explaining an embodiment of the present invention; FIG. 3 is a flowchart of a method for erasing data on an optical disc medium for explaining an embodiment of the present invention. 3 is a flowchart of a method for erasing data on an optical disc medium for explaining an embodiment of the present invention. It is an operation state diagram of the optical disk medium from which the data of the optical disk medium is removed for explaining the embodiment of the present invention, (a) radial movement from the inner circumference to the outer circumference, (b) rotational movement, (c) outer circumference (D) rotational movement from the inner circumference to the inner circumference. FIG. 3 is an external view of an optical disc medium erased by a complete erase mode in an optical disc media data removal method for explaining an embodiment of the present invention. FIG. 3 is an external view of an optical disc medium erased by a simple erase mode in an optical disc media data removal method for explaining an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical disk media Data erasing apparatus 12 Case 100 Light beam spot part 101 Media insertion slot 102 Media storage part 103 Media rotation part 104 Media rotation control part 105 Light beam output control part 106 Light beam drive part 107 Position sensor part 108 Light beam drive Control unit 109 CPU
110 Memory unit 111 Operation mode DB
112 Start SW
113 Operation mode selection SW
114 Operation mode display unit 115 Power supply unit 116 Temperature sensor unit 118 Optical disk media 120 Irradiation unit 122 Non-irradiation unit

Claims (16)

Condensing a light beam using halogen, xenon, or the like as a light source on a recording layer in the optical disc medium;
Heating the recording layer with the light beam spot;
Irradiating while moving the light beam spot from the inner periphery to the outer periphery of the optical disc medium;
By randomly deforming the optical disc media,
It is impossible to read the data on the optical disk media by destroying the recording layer without scattering the metal pieces of the optical disk media that may affect the surrounding environment and the human body or the dye of the recording layer. Method for erasing data on optical disc media to be in a proper state.   2. The method of erasing data on an optical disk medium according to claim 1, wherein the optical disk medium is deformed in a thickness direction so that the optical disk medium cannot be inserted into a playback device by random deformation of the optical disk medium.   2. The data erasing method of an optical disk medium according to claim 1, wherein the optical disk medium is deformed to such an extent that the optical disk medium can be clearly distinguished from the non-irradiated optical disk medium by random deformation of the optical disk medium.   2. A data erasing method for an optical disk medium according to claim 1, wherein the metal layer constituting the optical disk medium is destroyed and a resin layer adjacent to the metal layer is foamed so that the optical disk medium cannot read data. .   The movement of the light beam spot is performed from the inner circumference to the outer circumference and from the outer circumference to the inner circumference, and the optical disk media is rotated to influence the surrounding environment and the human body over the entire circumference. 2. The optical disk medium is made in a state in which the data cannot be read by destroying the recording layer without scattering the metal piece of the optical disk medium or the dye of the recording layer. A data erasing method of the optical disk medium described.   The movement of the light beam spot is performed from the inner circumference to the outer circumference and from the outer circumference to the inner circumference, and by rotating the optical disk media, a part of the entire circumference is changed to the surrounding environment or By destroying the recording layer without scattering the metal pieces of the optical disk medium that may affect the human body or the dye of the recording layer, the optical disk medium becomes incapable of reading the data. The method for erasing data on an optical disk medium according to claim 1.   When the light beam spot is irradiated while moving in the radial direction from the inner periphery to the outer periphery of the optical disk medium, at least one spot is irradiated over the entire data area existing in the radial direction. The method for erasing data on an optical disk medium according to claim 1.   When the light beam spot is irradiated while moving in the radial direction from the inner periphery to the outer periphery of the optical disk medium, the ratio of the irradiation area to the entire periphery is reproduced by the error correction flag. 2. The method for erasing data from an optical disc medium according to claim 1, wherein the irradiation is performed to an extent that makes it impossible.   When irradiating the light beam spot while moving in the radial direction from the inner periphery to the outer periphery of the optical disc medium, the light beam spot is scanned so that the previous irradiation region and the current irradiation region overlap. The method for erasing data on an optical disk medium according to claim 1.   2. The data erasure of an optical disk medium according to claim 1, wherein the irradiation speed is constant when the light beam spot is irradiated while moving in the radial direction from the inner periphery to the outer periphery of the optical disk medium. Method. A light beam spot portion for condensing a light beam using halogen, xenon, or the like as a light source on a recording layer in an optical disc medium;
A light beam output controller for heating the recording layer with the light beam spot;
A light beam drive control unit that irradiates the light beam spot while moving the light beam spot from the inner periphery to the outer periphery of the optical disc medium,
The optical disk media is randomly deformed,
Without scattering the metal pieces of optical disc media and the recording layer dyes that may affect the surrounding environment and human body,
A data erasing device for an optical disk medium that makes the optical disk medium unreadable by destroying the recording layer.   12. The optical disk media data erasing apparatus according to claim 11, wherein the optical disk media is deformed in a thickness direction so that the optical disk media cannot be inserted into a playback device by random deformation of the optical disk media.   12. The data erasing apparatus for an optical disk medium according to claim 11, wherein the optical disk medium is deformed to such an extent that it can be clearly distinguished from the non-irradiated optical disk medium by random deformation of the optical disk medium.   The optical disk medium is made by destroying a metal layer constituting the optical disk medium, or foaming a resin layer adjacent to the metal layer, or destroying the metal layer and foaming a resin layer adjacent to the metal layer. 12. The data erasing apparatus for an optical disk medium according to claim 11, wherein the data is unreadable.   The movement of the light beam spot is performed from the inner circumference to the outer circumference and from the outer circumference to the inner circumference, and the optical disk media is rotated to influence the surrounding environment and the human body over the entire circumference. 12. The optical disk medium is made in a state in which the data cannot be read by destroying the recording layer without scattering the metal piece of the optical disk medium or the dye of the recording layer that may give the recording medium. A data erasing device for the optical disk medium described.   The movement of the light beam spot is performed from the inner circumference to the outer circumference and from the outer circumference to the inner circumference, and by rotating the optical disk media, a part of the entire circumference is changed to the surrounding environment or By destroying the recording layer without scattering the metal pieces of the optical disk medium that may affect the human body or the dye of the recording layer, the optical disk medium becomes incapable of reading the data. 12. A data erasing apparatus for optical disc media according to claim 11.

Images