JPH11328742A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize weight balance of a whole optical disk even when the number of used electronic circuits are any number and to reproduce information recorded on an information recording area at an excellent characteristic without causing eccentricity and wobbly surface at a rotation time by constituting so that the electronic circuit is fitted to a substrate through a setting member uniformizing the weight balance in the state setting up the electronic circuit without directly burying the electronic circuit into the substrate. SOLUTION: This optical information recording medium 101 is provided with the substrate provided with the information recording area 102 and an information unrecorded area 103 existing on the inside of this area, the electronic circuit 104 writing-in/reading-out information without contacting and an antenna coil 105 for transmitting/receiving the information with the electronic circuit 104 and for supplying power source to the electronic circuit 104. In such a case, this recording medium is provided with the setting member 107 set upon the unrecorded area 103, formed with the antenna coil 105, set up with the electronic circuit 104 and uniformizing the weight balance in the state setting up the electronic circuit 104.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium provided with optical recording information such as a compact disc (hereinafter abbreviated as CD), and more particularly to an optical recording medium. Writing additional information other than information /
The present invention relates to an optical information recording medium that enables reading.

[0002]

2. Description of the Related Art CDs are mainly read-only optical information recording media. Recently, as described in JP-A-5-258347, a method of adding rewritable information to CDs, A method of adding secondary individual information to the information has been proposed. JP-A-5-258347 discloses two types of optical disks. The first optical disk has an EEP-ROM (Electrical ROM) in an information unrecorded area inside an information recording area in which optically recorded information is recorded.
ly Erasable & Programmable-Read Only Memory), and the second optical disc has a configuration in which a magnetic layer is provided in an information non-recording area inside an information recording area.

[0003] However, Japanese Patent Laid-Open Publication No.
The optical disc disclosed in Japanese Patent Publication No. 7 has the following problems. First, in the first optical disc,
Writing information to EEP-ROM and EEP-ROM
The electrode is EE to electrically read information from
There is a problem in that the optical disk must be pulled out from the P-ROM to the optical disk surface, the structure of the optical disk becomes extremely complicated, and the manufacturing cost increases. Further, since data is read and written by bringing the brush head into contact with the electrodes, there is a problem that the configuration of the recording / reproducing apparatus becomes complicated.

The second optical disc requires a magnetic head in addition to an optical pickup used for reproducing information recorded in an information recording area of the optical disc in a recording / reproducing apparatus for recording / reproducing the optical disc. In addition, there is a problem that a drive unit requiring high-precision control is provided in addition to the optical pickup drive unit, and the device becomes complicated and expensive.

An invention for solving the above problems is described in Japanese Patent Application Laid-Open No. 8-161790. FIG. 4 is a schematic diagram showing a planar configuration of a first embodiment of an optical disc disclosed in Japanese Patent Application Laid-Open No. 8-161790.
FIG. 5 is a schematic diagram showing a plan configuration of a second embodiment of the optical disk disclosed in Japanese Patent Application Laid-Open No. 8-161790. FIG. 6 is a schematic diagram showing a plan configuration of a third embodiment of the optical disc disclosed in Japanese Patent Application Laid-Open No. 8-161790. In the figure, 401 is an optical disk, 40
2 is an information recording area, 403 is an information unrecorded area, 404 is an electronic circuit, 405 is an antenna coil, and 406 is a center hole.

[0006] As shown in FIGS.
The optical disc 401 according to the first to third embodiments disclosed in Japanese Patent Application Laid-Open No. 61790 has an information recording memory in an information unrecorded area 403 between the innermost circumference of the information recording area 402 and the center hole 406. Means for transmitting and receiving data in a non-contact manner and an electronic circuit 40 in a non-contact manner
Antenna coil 40 as means for supplying operating power of 4
5 are formed. The antenna coil 405 includes an antenna coil for transmitting and receiving information and an antenna coil for supplying operating power.

The writing of secondary information to the electronic circuit 404 and the reading of secondary information from the electronic circuit 404 are performed by radio waves in a non-contact manner. Transmission and reception of signals between the electronic circuit 404 and the recording / reproducing device are performed by the antenna coil 4.
05. The operating power of the electronic circuit 404 is also electromagnetically supplied from the recording / reproducing device in a non-contact manner, and is supplied to the electronic circuit 404 via the antenna coil 405.

[0008] The optical disk 40 of the first embodiment shown in FIG.
Reference numeral 1 denotes an antenna coil 40 which arranges two electronic circuits 404 at symmetrical positions with respect to a center hole 406, transmits / receives information to / from each electronic circuit 404, and supplies operating power.
5 is formed in a region where the electronic circuit 404 is not disposed, at a symmetrical position with respect to the center hole 406.

An optical disk 40 according to a second embodiment shown in FIG.
Reference numeral 1 denotes one electronic circuit 404 and an antenna coil 405 for transmitting / receiving information to / from the electronic circuit 404 and supplying operating power.
Are arranged symmetrically with respect to the center hole 406.

An optical disc 40 according to a third embodiment shown in FIG.
Reference numeral 1 denotes an antenna coil 40 that arranges two electronic circuits 404 at symmetrical positions across a center hole 406, transmits and receives information to and from each of the electronic circuits 404, and supplies operating power.
5 is formed concentrically with the center hole 406 in the outer peripheral portion of the information unrecorded area 403.

With the optical disk having the above configuration, writing of information to the electronic circuit 404, reading of information from the electronic circuit 404, and power supply to the electronic circuit 404 can all be performed in a non-contact manner. It is not necessary to provide an electrical contact structure on the surface of the optical disk. Further, in the recording / reproducing apparatus for reproducing the optical disk, a magnetic head or the like is not required, so that there is an effect that the apparatus can be configured with a relatively simple configuration and inexpensively.

[0012]

The optical disk of the second embodiment shown in FIG.
05 are arranged symmetrically with respect to the center hole 406. Electronic circuit 404 and antenna coil 40
Since the weight of the optical disk 5 is not always the same, the weight balance in the radial direction of the optical disk is not uniform, and there is a problem that eccentricity, surface runout, and the like occur when the optical disk rotates.

The optical discs of the first and third embodiments shown in FIGS. 4 and 6 have the electronic circuit 404 and the antenna coil 405 at symmetrical positions with respect to the center hole 406.
, The dynamic balance during rotation of the optical disk becomes uniform. However,
The electronic circuit 40 is designed to maintain the dynamic balance.
Arranging the antenna coil 405 and the antenna coil 405 at an accurate position with the center hole 406 interposed therebetween has a problem that a highly accurate adjustment is required.

If the formation position of the electronic circuit 404 is slightly shifted in the radial direction or the circumferential direction, the dynamic balance at the time of rotation of the optical disk is lost, which causes eccentricity or surface runout.

Further, similarly to the electronic circuit 404, forming the antenna coil 405 at an accurate position also requires complicated adjustment, which has been a factor of increasing the manufacturing cost.

Further, even in an optical disk using only one electronic circuit 404, the electronic circuit 404 and the antenna coil 405 must be provided at symmetrical positions in consideration of the dynamic balance during rotation of the optical disk.
This was a factor of high cost.

[0017]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 of the present application is directed to an information recording area and an information unrecorded area inside the area. An optical information recording medium comprising: a substrate having an area; an electronic circuit capable of writing / reading information in a non-contact manner; and an antenna coil for transmitting / receiving information of the electronic circuit and supplying operating power. Installed in unrecorded area,
The antenna coil is formed, the electronic circuit can be installed thereon, and an installation member is provided which has a uniform weight balance when the electronic circuit is installed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the optical information recording medium according to the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a schematic diagram showing a planar structure of an optical information recording medium according to a first embodiment of the present invention. In the figure, 101 is an optical disk,
102 is an information recording area, 103 is an information non-recording area, 10
4 is an electronic circuit, 105 is an antenna coil, 106 is a center hole, and 107 is an installation member. FIG. 2 is a schematic diagram showing a sectional structure of the optical information recording medium according to the first embodiment of the present invention. In the figure, the same parts as those in FIG. 201 is a substrate, 202 is a recess, 203 is a reflective film, and 204 is a protective film. It is assumed that the antenna coil 105 in this embodiment has both functions of data transmission / reception and operation power supply.

As shown in FIG. 1 and FIG.
Reference numeral 01 denotes information provided with non-rewritable information, that is, information recording area 102 in which information is recorded as a pit row, and information between information recording area 102 and center hole 106 in which information is not recorded. It has a disk-shaped substrate 201 provided with an unrecorded area 103 and an annular recess 202 formed in the information unrecorded area 103. The inner diameter of the recess 202 is larger than the diameter of the center hole 106, and the outer diameter is smaller than the inner diameter of the information recording area 102. The depth of the concave portion 202 is formed to be substantially the same as the height of the installation member 107 described later.

The surface of the information recording area 102 of the substrate 201 is covered with a reflective film 203 of aluminum, gold or the like. The surface of the reflective film 203 is covered with a protective layer 204 made of a resin material or the like for protecting the reflective film 203 from being damaged.

An annular installation member 107 is embedded in an annular concave portion 202 formed in the information unrecorded area 103. The installation member 107 has substantially the same shape as the concave portion 202, but has an outer diameter, an inner diameter, and a height that can be embedded in the concave portion 202. An embedding portion (not shown) for embedding one or more electronic circuits 104 is formed in the installation member 107. The number of the embedded portions is the same as the number of the electronic circuits 104 to be used. The depth and the width in the vertical and horizontal directions of the embedded portion are substantially the same as those of the electronic circuit 104.
4 is a size that can be embedded.

The installation member 107 is designed so that the entire weight balance becomes uniform with one or a plurality of electronic circuits 104 embedded therein, and is made of, for example, an insulating material such as resin or ceramic. That is, when a solid having the same volume as the electronic circuit 104 is manufactured using the material, the installation member 107 may be selected from a material whose weight is the same as the weight of the electronic circuit 104.

The electronic circuit 104 has a configuration including a nonvolatile rewritable information recording memory (for example, EEP-ROM), and includes means for transmitting and receiving data in a non-contact manner and means for generating operating power in a non-contact manner. A certain antenna coil 1
05 are connected. Thus, secondary information other than the information recorded in the information recording area 102 can be written to the electronic circuit 104 and the information can be read from the electronic circuit 104.

The antenna coil 105 connected to the electronic circuit 104 is spirally formed on the surface of the installation member 107. The antenna coil 105 is made of copper (Cu), gold (A
u), a conductive material such as silver (Ag), nickel chromium (NiCr), and aluminum (Al). The antenna coil 105 may be formed by directly attaching a lead wire made of these materials, or may be formed by means such as vapor deposition or sputtering. Here, the antenna coil 1
05 and the protective film 20 to protect the electronic circuit 104.
4, the surface of the installation member 107 may be covered.

FIG. 3 is a schematic view showing one embodiment of the shape of the installation member when three electronic circuits are used. In the conventional optical disk, when three electronic circuits 104 are directly installed on the substrate 201, the position at which the electronic circuits are installed must be determined by very strict adjustment. Since the embedded portion for embedding the antenna coil 105 and the three electronic circuits 104 is formed, and the three electronic circuits 104 are installed, the weight balance is designed to be uniform when the three electronic circuits 104 are installed. 107 to the optical disk 10
1 may be installed in any orientation, and manufacturing is simple.

[0026]

As described above, in the optical information recording medium of the present invention, the electronic circuit is not directly embedded in the substrate, and the electronic circuit is installed on the substrate via the installation member having a uniform weight balance. With this configuration, the weight balance of the entire optical disc becomes uniform regardless of the number of electronic circuits used. Therefore, the information recorded in the information recording area can be reproduced with good characteristics without causing eccentricity and surface runout during rotation.

Further, since the electronic circuit is mounted on the mounting member on which the embedded portion for embedding the electronic circuit and the antenna coil are formed and then mounted on the substrate, an optical disk having a uniform weight balance can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a planar structure of an optical information recording medium according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a cross-sectional structure of the optical information recording medium according to the first embodiment of the present invention.

FIG. 3 is a schematic view showing one embodiment of a shape of an installation member when three electronic circuits are used.

FIG. 4 is a schematic view showing a planar configuration of a first embodiment of an optical disc disclosed in Japanese Patent Application Laid-Open No. 8-161790.

FIG. 5 is a schematic diagram showing a planar configuration of a second embodiment of the optical disc disclosed in Japanese Patent Application Laid-Open No. 8-161790.

FIG. 6 is a schematic diagram showing a planar configuration of a third embodiment of the optical disc disclosed in Japanese Patent Application Laid-Open No. 8-161790.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Optical disk 102 Information recording area 103 Information unrecorded area 104 Electronic circuit 105 Antenna coil 106 Center hole 107 Installation member 201 Substrate 202 Depression 203 Reflection film 204 Protection film 401 Optical disk 402 Information recording area 403 Information unrecorded area 404 Electronic circuit 405 Antenna coil 406 center hole

Claims (1)

[Claims] A substrate provided with an information recording area and an information non-recording area located inside the area;
An optical information recording medium comprising an readable electronic circuit and an antenna coil for transmitting and receiving information of the electronic circuit and for supplying operating power, wherein the antenna coil is formed in the information unrecorded area, An optical information recording medium characterized by comprising an installation member on which an electronic circuit can be installed and which has a uniform weight balance when the electronic circuit is installed.