JP2007335026A - Optical disk recording and playback device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording and playback device wherein influence of a conductive casing on communication between an IC chip of an optical disk and a reader/writer of an optical disk drive is reduced and to provide its antenna. <P>SOLUTION: The reader/writer side antenna 40 is embedded in a chucking plate pressing plate 35 made of resin and the IC chip 21 mounted on the optical disk 10 communicates via an antenna coil 22. The whole drive including a turntable 30 and a spindle motor 32 is covered by the casing 50 of a conductive material. A magnetic shield member 51 is provided between the antenna 40 and the casing 50 and a supporting structural body 34 of a chucking plate 33 is fixed to the casing 50 via the magnetic shield member 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disk recording / reproducing apparatus capable of communicating with an IC (Integrated Circuit) chip mounted on an optical disk through a looped antenna coil, and in particular, communicating with a built-in reader / writer. The present invention relates to an optical disc recording / reproducing apparatus in which the above is not hindered.

  In recent years, DVD (Digital Versatile Disk) has been widely used as an optical disk medium capable of recording large-capacity data such as video. Recently, the development of an optical disc using a blue semiconductor laser as a light source has been promoted for the purpose of recording images with higher image quality and longer time. As one type, Blu-ray Disc (Sony shares) has already been developed. A registered trademark of the company (hereinafter abbreviated as BD) is commercialized.

  As described above, as high-quality digital content can be easily stored in a portable recording medium, the importance of protecting the copyright of the digital content is increasing. In the BD, an ID (Identification) unique to each disk is recorded as a barcode pattern on the innermost periphery of a signal recording area called a BCA (Burst Cutting Area), and this ID is read by a player to obtain an illegal The disc is managed so that it will not be played. However, technology for creating illegal discs is becoming more sophisticated year by year, and it is said that more robust copyright protection measures are required.

  On the other hand, in recent years, RFID (Radio Frequency Identification) tags, which are IC chips capable of exchanging information with the outside without contact, have come to be used for admission cards, traffic tickets, electronic money, and the like. An RFID tag receives a radio wave or magnetic field from a reader / writer (R / W) with an antenna and converts it into an electromotive force. Therefore, the RFID tag does not have a built-in battery, is lightweight, has excellent portability, and can be used semipermanently. It has the characteristics. In addition to this, there is a feature that replication is very difficult.

  From such a background, it is considered that an RFID tag is mounted on an optical disc to strengthen copyright protection measures. For example, by mounting an RFID tag having a disc ID recorded in a read-only state on an optical disc, the risk of duplicating an optical disc having the same disc ID is greatly reduced as compared to the case where the above BCA pattern is used. Can do.

  Furthermore, when there is a margin in the storage capacity of the RFID tag, it is possible to store an application that provides a benefit to the user in the remaining storage area and generate a new added value to the optical disc. For example, an RFID tag is provided on a ROM (Read Only Memory) type optical disc in which game software is stored, and the state of the game is stored in the RFID tag, or the recorded content in the optical disc is recorded on the RFID tag, It is conceivable that the recorded contents can be known only by holding the optical disc over the R / W without inserting it into the player.

  By the way, in the case of an optical disc equipped with an RFID tag, it is necessary to form an antenna for wireless communication and power supply on the optical disc. A plurality of frequency bands are considered for wireless communication of the RFID tag, and the length and shape of the antenna differ depending on the frequency band. Generally, a coiled antenna is used in the long wave band (125 to 135 kHz) and the short wave band (13.56 MHz), and a half wavelength is used from the UHF (Ultra High Frequency) band (near 900 MHz) to the microwave band (2.45 GHz). A linear antenna (dipole antenna) or a planar antenna (microstrip antenna) having a length corresponding to is used.

  Since an optical disk is a disk that rotates around a center hole (center hole), it is compatible with a loop or spiral antenna from the viewpoint of weight balance. For this reason, there are many cases where an annular or spiral antenna pattern is formed on the inner side (clamp area) or the back side of the signal recording area on the optical disk (see, for example, Patent Document 1). ).

FIG. 13 is a diagram showing a configuration of a conventional optical disc on which an RFID tag is mounted.
Here, as an example, an optical disk 100 is shown in which an IC chip 210 constituting a RFID tag and a spiral antenna (antenna coil 220) pattern are formed on the inner peripheral side of the disk. In this optical disc 100, a reflective film is formed in a region 120 between the center hole 110 and the outermost peripheral portion, and the inner region 130 is used as a signal recording surface. Further, the IC chip 210 and the antenna coil 220 for wireless communication are provided in the clamp region 140 between the reflective film region 120 and the center hole 110 where the reflective film is not formed. The antenna coil 220 is formed as a thin film of a conductive material such as silver (Ag) or aluminum (Al), and is connected to the connection terminal of the IC chip 210 by a conductive adhesive or the like.

  Wireless communication in a long wave band or a short wave band is more resistant to water, obstacles, radio wave interference, and the like than a band having a shorter wavelength, and is said to have high reliability. For example, at 13.56 MHz, when the antenna coil 220 is formed around the center hole 110 of the optical disc 100, the degree of freedom in design is high, for example, the number of coil turns is about five. For these reasons, at present, many RFID tags that communicate using the long wave band and the short wave band have been put to practical use in applications that do not require a long communication distance. However, the use of RFID tags is expected to expand in the future, and since RFID tags using UHF band and microwave band are promoted internationally, RFID tags using these bands will be used in the future. Is also expected to spread rapidly.

FIG. 14 is a side sectional view showing an example of the chucking mechanism of the optical disc recording / reproducing apparatus.
The turntable 310 is coupled to the rotation shaft 321 of the spindle motor 320. A ferromagnetic metal part 311 is provided at the center of the turntable 310. On the other hand, the chucking plate 330 is provided with a magnet 331 at the center for clamping the optical disk from above.

  During chucking of the optical disk, the turntable 310 is lifted together with the spindle motor 320, abuts against the clamp area of the optical disk and pushes it up, and the metal part 311 of the turntable 310 protrudes from the center hole of the optical disk. At this time, the magnet 331 of the chucking plate 330 and the metal part 311 of the turntable 310 are fixed by magnetic force due to the rise of the turntable 310. As a result, the chucking plate 330 rotates together with the optical disk fixed to the turntable 310. Further, when the optical disc is ejected from the disc tray, the spindle motor 320 is controlled to be lowered to release the optical disc from the turntable 310.

  Such a conventional optical disc recording / reproducing apparatus uses an antenna coil, an electrostatic coupling element, or an optical coupling element as a medium for performing non-contact communication with an IC chip mounted on the optical disk. (For example, refer to Patent Document 2).

FIG. 15 is a diagram showing a state of non-contact communication with an IC chip mounted on the inner periphery of the optical disc.
Here, as an example, a state where the antenna 400 on the reader / writer side is embedded in a resin chucking plate pressing plate 333 which is a support structure of the chucking plate 330 and the optical disc 100 is clamped on the turntable 310 is shown. Show. The support structure 332 of the chucking plate 330 defines the movable range of the chucking plate 330 so that the chucking plate 330 and the turntable 310 are separated from each other when the optical disk 100 is ejected from the disk tray. 330 prevents the optical disk 100 from coming into contact.

Here, the antenna coil 220 on the IC chip 210 side and the antenna 400 on the reader / writer side are both a loop antenna having one or more turns arranged so as to be centered on the rotation shaft 321 of the spindle motor 320. Thus, communication between the antenna coil 220 and the antenna 400 is possible even when the optical disc 100 is rotating. Further, since the main part of the chucking plate 330 itself is formed of a non-conductive material, no eddy current is generated in the magnetic field for communication. Therefore, the adverse effect of the chucking mechanism on the communication between the optical disc recording / reproducing apparatus and the optical disc can be eliminated and reduced.
JP-A-9-245381 (paragraph numbers [0011] to [0014], FIG. 1) JP 2000-509541 A (Page 12-14, Figure 3)

FIG. 16 is a cross-sectional view showing the overall structure of an optical disk drive provided with the chucking mechanism of FIG.
As shown in FIG. 16, an optical disk drive is generally covered with a conductive material casing 500 in order to maintain a magnetic shield from the outside. In this case, a support structure 332 that supports the chucking plate is provided integrally with the housing 500, or the housing 500 exists directly above the chucking plate pressing plate 333. Therefore, even if the main part of the chucking plate 330 is formed of resin, the drive housing 500 made of a conductive material may be present at a position close to the antenna 400 mounted on the reader / writer side. Since it is general, an eddy current is generated in the housing 500 by the magnetic field 401 generated by the antenna 400. Such an eddy current may be an obstacle to communication by the magnetic field 401, making it difficult to communicate between the IC chip on the optical disc 100 and the reader / writer.

  In addition, in a thin drive adopted in a notebook PC or the like, there is one in which a chucking mechanism is provided as a ball chucking mechanism on the turntable side without using a chucking plate or the like. The IC chip mounted optical disk installed on the turntable and the drive housing are very close to each other, making it difficult to install an antenna for communication between the IC chip mounted on the optical disk and the reader / writer. Moreover, when the top plate of the drive is made of a conductive material, there is a problem that the antenna cannot be directly installed there.

  The present invention has been made in view of the above points, and by suppressing the generation of eddy currents in the conductive casing, the effect of the conductive casing on the communication between the IC chip of the optical disc and the reader / writer is affected. An object of the present invention is to provide an optical disc recording / reproducing apparatus with reduced influence.

  In the present invention, in order to solve the above problem, when an optical disc mounted with a loop-shaped or spiral antenna coil and an IC chip is inserted, along with recording and reproduction of signals to and from the signal recording area of the optical disc, In an optical disc recording / reproducing apparatus capable of non-contact communication with the IC chip, a disc clamp mechanism provided inside a casing made of a conductive material and supporting a rotation center of the optical disc at the time of recording / reproducing the optical disc, A spindle unit disposed inside a housing and configured to rotate the optical disc supported by the disc clamp mechanism integrally with the disc clamp mechanism; and the antenna coil in a state in which the optical disc is rotatable by the spindle unit. The IC chip is disposed at the opposite position and the antenna coil is interposed through the antenna coil. And an antenna for communicating with contactless, optical disk recording and reproducing apparatus characterized by comprising a magnetic shield member disposed between said housing adjacent to face the antenna is provided.

  In such an optical disc recording / reproducing apparatus, the optical disc is supported by the disc clamp mechanism inside the casing made of a conductive material, and is rotated integrally with the disc clamp mechanism by the spindle unit. In this state, on the optical disc recording / reproducing apparatus side, the antenna can communicate with the IC chip provided on the optical disc via the antenna coil in a non-contact manner. At this time, since the magnetic shield member provided between the antenna and the housing prevents a magnetic field leaking from the antenna to the housing, generation of eddy current is suppressed even in the housing made of a conductive material. .

  According to the optical disk recording / reproducing apparatus of the present invention, when performing non-contact communication with an IC chip on an optical disk, the influence on the communication signal from the casing made of a conductive material is eliminated, and the communication environment is improved. it can.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a plan view and a cross-sectional view showing an optical disc on which signals are recorded and reproduced by the optical disc recording / reproducing apparatus.

  First, the optical disk 10 and the IC chip module 20 mounted thereon will be described. The optical disk 10 shown in FIG. 1 has the following basic structure common to general optical disk media such as CD (Compact Disc), DVD, and BD. That is, the optical disc 10 is provided with a central hole 11 at the center. When the optical disc 10 is inserted into a player, the optical disc 10 is rotated around the central hole 11 and the signal recording surface is irradiated with laser light. Then, a signal is read according to the amount of the reflected light.

  A reflective film 12 made of a conductive material such as Ag or Al is formed in a region outside the center hole 11 of the optical disk 10 by a predetermined distance. Out of the area where the reflective film 12 is formed, the inner side excluding the lead-in area on the inner peripheral side and the lead-out area on the outer peripheral side is the signal recording area. In this embodiment (the same applies to other embodiments), a read-only optical disk from the signal recording area is mentioned as an example. In the case of a writable optical disk, the signal recording area has a reflective film. In addition, a recording film, a dielectric film, and the like are further formed.

  The IC chip module 20 includes a non-contact communication IC chip 21 and a four-turn loop antenna coil 22 attached to a PET (Poly Ethylene Terephthalate) substrate 23 having a diameter of 35 mm. It has an annular shape in which 18 mm round holes 24 are provided. The IC chip 21 and the antenna coil 22 are joined by an anisotropic conductive film (ACF) or the like on the lower surface of the IC chip, for example. The IC chip module 20 is affixed to a clamp region 13 between the optical disc 10 and the central hole 11 where the reflective film 12 is not formed. Here, when the disk substrate is injection-molded, a recess having a size capable of fitting the IC chip 21 is formed, and the IC chip module 20 is attached so that the IC chip 21 is embedded therein. I have to.

FIG. 2 is a side sectional view showing the optical disc recording / reproducing apparatus according to the first embodiment.
As shown in FIG. 2, the optical disc recording / reproducing apparatus according to the first embodiment includes a turntable 30 and a spindle motor 32 that drives a rotating shaft 31 thereof. The optical disk 10 is clamped by the chucking plate 33 on the turntable 30. The chucking plate 33 has a movable range defined by the support structure 34. An antenna 40 of a reader / writer (not shown) mounted on the optical disc recording / reproducing apparatus is embedded in the resin chucking plate pressing plate 35. As a result, the IC chip 21 mounted on the optical disk 10 can communicate with the reader / writer side antenna 40 via the antenna coil 22. The entire drive including the turntable 30 and the spindle motor 32 is covered with a casing 50 made of a conductive material, and a magnetic shield from the outside is secured.

  Here, the difference from the conventional optical disk recording / reproducing apparatus (FIG. 15) is that a magnetic shield member 51 is provided between the antenna 40 and the housing 50 in order to prevent the induction magnetic field from leaking from the antenna 40 to the housing 50. The support structure 34 of the chucking plate 33 is fixed to the housing 50 with the magnetic shield member 51 interposed therebetween. Therefore, when the IC chip 21 exchanges information with the outside in a non-contact manner, an induced magnetic field generated by the antenna 40 passes through the magnetic shield member 51, and an eddy current is generated in the casing 50 of the conductive material. Will not occur. Further, reflection of electromagnetic waves generated by the antenna 40 by the casing 50 can also be suppressed.

  The magnetic shield member 51 described above is made of a soft magnetic material having a high magnetic permeability such as sendust (Fe—Si—Al), permalloy (Ni—Fe), or ferrite (Ni—Zn, Mn—Zn). It is a sheet-like member that is formed and needs to be disposed as a magnetic absorption layer having a necessary thickness between the antenna 40 and the casing 50 of the conductive material. By using such a sheet-like (or film-like) magnetic shield member, the communication environment with the IC chip 21 can be improved without increasing the thickness of the optical disk recording / reproducing apparatus.

  In FIG. 2, only a part of the housing 50, the support structure 34, and the optical disk 10 are shown. In addition, an optical pickup mechanism for recording a signal in the recording area where the reflective film 12 of the optical disk 10 is formed or reproducing the recorded signal is provided in the housing 50 of the optical disk recording / reproducing apparatus. However, it is omitted in FIG. The optical pickup mechanism is arranged on the lower side in the figure with respect to the optical disc 10.

  FIG. 3 is a plan view showing an example of the arrangement and shape of the magnetic shield member in the optical disk recording / reproducing apparatus of FIG. Here, along with the shape of the magnetic shield member 51 when viewed from above the optical disk 10, the positional relationship with the chucking plate 33 is also shown by an imaginary line by a two-dot chain line.

  The IC chip module 20 affixed to the clamp area 13 of the optical disk 10 has the reader / writer side antenna 40 disposed substantially concentrically with the optical disk 10 in a state where the optical disk 10 is clamped by the chucking plate 33. Communication is possible. Therefore, the magnetic shield member 51 is arranged to be concentric with the optical disc 10 so as to cover the region corresponding to the antenna 40, so that the above-described effect of suppressing the eddy current is exhibited. The magnetic shield member 51 is, for example, the same size as the IC chip module 20 and can be formed in a circular shape as shown in FIG.

FIG. 4 is a plan view showing another shape of the magnetic shield member applicable to the antenna of the optical disk recording / reproducing apparatus of FIG.
Here, a regular hexagonal magnetic shield member 52 is used. By using the polygonal magnetic shield member 52 in this way, when cutting a plurality of sheets of the same shape from a single sheet-like magnetic shield member, compared to the circular one shown in FIG. It is possible to effectively use the material by reducing the useless portion of the material. In particular, by using a regular hexagon, wasteful parts of the material can be remarkably reduced.

  In this type of disk drive device, the lid or door provided on the device main body is opened, the disk is directly mounted on the turntable facing from the device, and the disc is inserted into the disk tray that is horizontally removed from the device main body. There is a type in which the disc is automatically mounted on the internal turntable when the disc tray is pulled.

[Second Embodiment]
Next, a ball chucking mechanism for directly mounting an optical disc on a turntable provided on a disc tray or the like of the optical disc recording / reproducing apparatus will be described.

FIG. 5 is a diagram showing a chucking mechanism in the optical disc recording / reproducing apparatus according to the second embodiment.
In the ball chucking mechanism of this optical disk recording / reproducing apparatus, a center hub 61 is integrally formed at the center of the turntable 60, and an annular disk mounting surface 62 is horizontally formed on the outer peripheral upper surface. An annular concave portion 63 is formed between the mounting surface 62 and a tapered surface 64 is formed on the outer periphery of the upper end of the center hub 61.

  In the center hub 61 of the ball chucking mechanism, four concave portions 65 are formed at the upper part of the taper surface 64 at four circumferential positions, and balls 66 such as steel balls are loosely fitted therein. . In the center hub 61, pressing means such as an O-ring or a spring material is incorporated in the lower part of the four recesses 65, and the four balls 66 are pressed toward the outside of the center hub 61 by the compression repulsive force. Thus, the optical disk 10 is fixed to the center hub 61 by its action.

FIG. 6 is a diagram showing a state of non-contact communication with the IC chip in the optical disc recording / reproducing apparatus according to the second embodiment.
The optical disk 10 is fixed to the turntable 60 of the optical disk recording / reproducing apparatus with the center hole 11 inserted in the center hub 61. At this time, since the optical disk 10 receives force from the four balls 66 of the center hub 61 in the outer circumferential direction and in the downward direction in the figure, when the turntable 60 is rotationally driven by the spindle motor 32, the optical disk 10 is also integrated. Will rotate. An IC chip module 20 having an antenna coil 22 shown in FIG.

  The reader / writer side antenna 40 is formed by being embedded in a thin disc 41 made of a resin material. The disc 41 is attached to the inside of the conductive material casing 50 via the magnetic shield member 53 and above the center hub 61 of the ball chucking mechanism. The magnetic shield member 53 is a sheet-like member made of a soft magnetic material having a high magnetic permeability, as in the first embodiment.

  The antenna 40 can communicate with the IC chip 21 mounted on the optical disc 10 through the antenna coil 22. That is, the induction magnetic field generated by the antenna 40 on the reader / writer side passes through the inside of the magnetic shield member 53, so that no eddy current is generated in the conductive material casing 50. Therefore, the IC chip 21 of the optical disk 10 is not affected by the casing 50 of the conductive material through the antenna coil 22 formed in the clamp region 13 and is not affected by the antenna 40 on the reader / writer side. Communication using an induced magnetic field can be performed. In addition, the distance between the optical disk 10 and the antenna coil 22 is small, and reliable magnetic coupling is possible.

  In the second embodiment described above, an example in which the ball chucking mechanism is used to fix the optical disk 10 on the turntable 60 side has been described. However, a member other than the ball is used for such fixing. It may be done. As in the first embodiment, the thickness of the optical disc recording / reproducing apparatus is fixed by fixing the optical disc 10 only by the mechanism on the turntable 60 side without providing the chucking plate 33 or the like on the side facing the turntable 30. Therefore, such a mechanism is often used in an optical disc recording / reproducing apparatus for a notebook PC (personal computer). Then, as in the present embodiment, the sheet-like or film-like magnetic shield member suppresses the generation of eddy currents in the conductive casing, thereby increasing the thickness of the optical disk recording / reproducing device without increasing the thickness. This is particularly effective because the communication environment with the chip 21 can be improved.

  In each of the above embodiments, when the casing 50 is made of a non-conductive material, the reader / writer side antenna 40 can be disposed outside the casing 50. Even in such a case, since many of the outer casings surrounding the casing 50 are made of a conductive material, by disposing the magnetic shield member 53 between the outer casing and the antenna 40, the outer casing is arranged. Generation of eddy currents in the body can be prevented.

[Third Embodiment]
By the way, in the above-described two embodiments, the reader / writer side antenna 40 is formed corresponding to the IC chip module 20 in the clamp area 13 which is the signal non-recording area formed in the inner peripheral portion of the optical disc 10. It was what has been. However, in the optical disc recording / reproducing apparatus having the structure in which the optical disc 10 is clamped by the chucking plate 33 made of a conductive material, communication with an induced magnetic field is performed with the optical disc 10 in which the IC chip module 20 is embedded in the clamp region 13. I can't.

  Therefore, it is conceivable to arrange the antenna coil of the IC chip module in the signal recording area formed on the outer periphery of the optical disk. Hereinafter, an optical disk recording / reproducing apparatus capable of communicating with such an optical disk will be described.

FIG. 7 is a plan view showing an optical disc according to the third embodiment.
As shown in FIG. 7, the optical disk 10 has an IC chip module 70 mounted on the recording area where the reflective film 12 is formed. In this IC chip module 70, an IC chip 71 for non-contact communication and a three-turn loop antenna coil 72 are attached on a PET substrate 73 having a diameter of 119 mm, which is slightly smaller than the diameter of the optical disk 10. A round hole 74 is formed in the center of the PET substrate 73, and the round hole 74 is formed to have a diameter of 18 mm that is slightly larger than the center hole 11 of the optical disk 10.

  In this example, since the IC chip 71 has a predetermined thickness, it is disposed in the clamp area 13 of the optical disc 10. Therefore, a concave portion for embedding the IC chip 71 is formed in the clamp region 13 of the optical disc 10 in advance, and the IC chip module 70 is attached.

  In the optical disc 10, the antenna coil 72 of the IC chip module 70 is disposed in the signal recording area of the optical disc 10. Therefore, unlike the optical disk recording / reproducing apparatus shown in FIG. 1, even if the optical disk 10 is clamped by a chucking plate made of a conductive material, the antenna coil 72 is connected to the reader / writer side antenna. It is possible to communicate via

FIG. 8 is a side sectional view showing an optical disk recording / reproducing apparatus to which the optical disk of FIG. 7 is mounted.
The optical disk recording / reproducing apparatus shown in FIG. 8 is different from that shown in FIG. 1 in that the optical disk 10 is clamped on the turntable 30 by a conductive chucking plate 83 and rotated integrally by a spindle motor 32. The support structure 84 that defines the movable range of the chucking plate 83 is made of a non-conductive material, and the reader / writer side antenna 40 is provided there. In this case, the magnetic shielding member 54 is provided between the support structure 84 and the outer casing 50 so that the induction magnetic field does not leak into the casing 50 of conductive material. Therefore, when the IC chip 71 exchanges information with the outside in a non-contact manner, the induced magnetic field generated by the antenna 40 passes through the magnetic shield member 54, and eddy current is generated in the casing 50 of the conductive material. It does not occur and information transfer with the IC chip 71 is not hindered.

  FIG. 9 is a plan view showing an example of antenna arrangement and shape in the optical disc recording / reproducing apparatus of FIG. Here, the positional relationship with the chucking plate 83 is also shown by an imaginary line by a two-dot chain line together with the shape of the magnetic shield member 54 when viewed from above the optical disk 10.

  In the IC chip module 70 attached to the signal recording area of the optical disc 10, the reader / writer side antenna 40 is substantially the same shape as the antenna coil 72 on the optical disc 10 in a state where the optical disc 10 is clamped by the chucking plate 83. Communication is possible if they are arranged at substantially concentric positions. In view of this, the magnetic shield member 54 is arranged in a size that covers the area corresponding to the antenna 40 and is substantially the same shape and substantially concentric as the formation area of the antenna coil 72 on the optical disk 10, thereby exhibiting the above-described eddy current suppression effect. I try to let them. The shape of the magnetic shield member 54 may be an annular shape as shown in FIG.

FIG. 10 is a plan view showing another shape of the magnetic shield member applicable to the antenna of the optical disk recording / reproducing apparatus of FIG.
When a plurality of annular magnetic shield members 54 are cut out from a single high permeability sheet as shown in FIG. 9, only the material corresponding to the hollow portion is wasted. Therefore, as an example, eight rectangular magnetic shield members 55 are bonded to each other so as to cover the annular antenna 40. If comprised in this way, compared with the thing of the shape shown in FIG. 9, a high magnetic permeability material can be utilized efficiently.

FIG. 11 is a side sectional view showing a modification of the optical disc recording / reproducing apparatus according to the third embodiment.
Here, when the support structure 84 of the chucking plate 83 is also made of a conductive material, a magnetic shield member is provided between the antenna 40 and the support structure 84 in order to prevent an induced magnetic field from leaking to the support structure 84. 55 is provided. Therefore, when the IC chip 71 exchanges information with the outside in a non-contact manner, an induced magnetic field generated by the antenna 40 passes through the magnetic shield member 55, and the support structure 84 made of a conductive material has a vortex. No current is generated and the communication environment can be improved.

  In each of the above-described embodiments, the reader / writer side antenna 40 is formed by being embedded in a resin chucking plate pressing plate 35, its supporting structure 34, or a resin material disk 41. In addition, for example, the antenna 40 in which an antenna pattern made of a metal layer is formed on a resin film or the like may be used. If it is the antenna 40 formed in such a resin film, it can affix in advance on the magnetic shield members 51, such as a ferrite sheet, and can be installed easily. Further, the antenna 40 formed on the resin film can be disposed on either the upper surface or the lower surface of the chucking plate pressing plate 35 and the support structure 34 made of resin. 51 must be arranged on the upper surface of the antenna 40 (on the conductor housing side).

FIG. 12 is a diagram showing an antenna forming procedure of the optical disc recording / reproducing apparatus.
First, the high permeability sheet is cut, and a magnetic shield member having a size including the antenna area on the optical disk side and the antenna area on the reader / writer side is cut out therefrom (step S1). Next, an antenna pattern is formed on the cut magnetic shield member by sputtering, plating, or printing (step S2).

  Next, the antenna pattern is connected to the reader / writer by bonding a cable for bonding with the reader / writer to the terminal on the magnetic shield member formed simultaneously with the antenna pattern (step S3). Finally, the magnetic shield member on which the antenna pattern is formed is attached to a predetermined position of the drive housing or the chucking plate pressing plate 35 and its support structure 34 (step S4).

It is a top view which shows the optical disk by which a signal is recorded and reproduced | regenerated with this optical disk recording / reproducing apparatus. It is side surface sectional drawing which shows the optical disk recording / reproducing apparatus concerning 1st Embodiment. FIG. 3 is a plan view showing an example of the arrangement and shape of a magnetic shield member inside the optical disc recording / reproducing apparatus of FIG. 2. It is a top view which shows the magnetic shield member of another shape applicable to the antenna of the optical disk recording / reproducing apparatus of FIG. It is a figure which shows the chucking mechanism in the optical disk recording / reproducing apparatus which concerns on 2nd Embodiment. It is a figure which shows the state of non-contact communication with IC chip in the optical disk recording / reproducing apparatus which concerns on 2nd Embodiment. It is a top view which shows the optical disk which concerns on 3rd Embodiment. It is side surface sectional drawing which shows the optical disk recording / reproducing apparatus with which the optical disk of FIG. 7 was mounted | worn. It is a top view which shows an example of arrangement | positioning and the shape of the antenna in the optical disk recording / reproducing apparatus of FIG. It is a top view which shows the magnetic shield member of another shape applicable to the antenna of the optical disk recording / reproducing apparatus of FIG. It is side surface sectional drawing which shows the modification of the optical disk recording / reproducing apparatus which concerns on 3rd Embodiment. It is a figure which shows the formation procedure of the antenna of an optical disk recording / reproducing apparatus. It is a figure which shows the structure of the conventional optical disk with which the RFID tag was mounted. It is side surface sectional drawing which shows an example of the chucking mechanism of an optical disk recording / reproducing apparatus. It is a figure which shows the state of non-contact communication with the IC chip mounted in the inner peripheral part of the optical disk. It is sectional drawing which shows the whole structure of the drive for optical discs provided with the chucking mechanism of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Optical disk, 11 ... Center hole, 12 ... Reflection film, 13 ... Clamp area | region, 20, 70 ... IC chip module, 21, 71 ... IC chip, 22, 72 ... Antenna coil, 23, 73: PET substrate, 24, 74 ... Round hole, 30, 60 ... Turntable, 31 ... Rotating shaft, 32 ... Spindle motor, 33, 83 ... Chucking plate, 34, 84 ... Support structure Body, 35 ... Chucking plate holding plate, 40 ... Antenna, 41 ... Disc, 50 ... Housing, 51-55 ... Magnetic shield member, 61 ... Center hub, 62 ... Disc mounting surface 63 ...... Recessed portion, 64 ...... Tapered surface, 65 ...... Recessed portion, 66 …… Ball

Claims (10)

An optical disc capable of non-contact communication with the IC chip as well as recording and reproduction of signals to and from the signal recording area of the optical disc when an optical disc mounted with a loop-shaped or spiral antenna coil and an IC chip is inserted In the recording / reproducing apparatus,
A disc clamp mechanism provided inside a housing made of a conductive material and supporting the rotation center of the optical disc during recording and reproduction of the optical disc;
A spindle unit disposed inside the housing and rotating the optical disc supported by the disc clamp mechanism integrally with the disc clamp mechanism;
An antenna that is disposed at a position facing the antenna coil in a state where the optical disk is rotatable by the spindle unit, and communicates with the IC chip through the antenna coil in a contactless manner;
A magnetic shield member provided between the housing and facing the antenna; and
An optical disc recording / reproducing apparatus comprising:   When the antenna has a loop shape or a spiral shape corresponding to the antenna coil mounted on the optical disc, the magnetic shield member is formed in an annular shape covering a region corresponding to the antenna. The optical disk recording / reproducing apparatus according to claim 1.   When the antenna has a loop shape or a spiral shape corresponding to the antenna coil mounted on the optical disc, the magnetic shield member is formed in a polygonal shape covering a region corresponding to the antenna. The optical disk recording / reproducing apparatus according to claim 1.   4. The optical disk recording / reproducing apparatus according to claim 3, wherein the magnetic shield member is formed in a regular hexagonal shape.   When the antenna has a loop shape or a spiral shape corresponding to the antenna coil mounted on the optical disc, the magnetic shield member is formed by a plurality of polygonal members each having the same shape and size, 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the polygonal member covers an area corresponding to the antenna.   2. The optical disk recording / reproducing apparatus according to claim 1, wherein the magnetic shield member is a sheet-like or film-like member made of a high magnetic permeability material that blocks an induction magnetic field from the antenna to the housing.   When the disc clamp mechanism includes a turntable that supports the optical disc and a chucking plate that chucks the optical disc from above the turntable, the antenna and the magnetic shield member are each of the chucking 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the optical disk recording / reproducing apparatus is disposed on a plate support structure.   When the disc clamp mechanism has a chucking structure for chucking the optical disc on the turntable by a pressing mechanism that presses the edge of the center hole of the optical disc, the antenna and the magnetic shield member are respectively provided on the casing. 2. The optical disk recording / reproducing apparatus according to claim 1, wherein the optical disk recording / reproducing apparatus is disposed on an inner surface at a position facing the antenna coil.   2. The optical disc recording / reproducing apparatus according to claim 1, wherein the antenna is formed by depositing a conductive material on one surface of a resin film or a resin sheet.   The casing is an outer casing made of a conductive material, the disk clamp mechanism and the spindle unit are housed in a non-conductive inner casing provided inside the outer casing, and the antenna is The magnetic shield member may be disposed between the inner casing and the outer casing that are adjacent to and opposed to the antenna when disposed between the inner casing and the outer casing. Item 4. The optical disc recording / reproducing apparatus according to Item 1.

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