# US 6,724,693 B1 · Optical disk having readable information on both sides of the disk combination with an optical disk device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,724,693 B1 - Document ID: US6724693B1 - Status: Granted - Kind: B1 - Application number: 09/505,047 - Filed: 2000-02-16 - Granted: 2004-04-20 - Earliest claimed: 1999-02-19 - Assignees: Sony Computer Entertainment Inc. - Inventors: Ken Kutaragi; Kazuo Miura - Web page: https://patentgrep.com/patent/US6724693B1 ## CPC - G11B 23/40: Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract An optical disk has a magnetic recording medium and/or magnetic playback medium. The magnetic substance carrying recording data is formed on the label side of the optical disk. The magnetic substance is formed as a pattern of a desired shape by silk screen printing using an ink containing a magnetic substance. ## Claims ### Claim 1 An optical disk device in combination with an optical disk, said optical disk comprising: a central opening and an outer circumferential edge with: a recording area for recording programs defined therebetween, a lead-out area defined between said recording area and said outer circumferential edge, and an outside area defined outside of said recording area and said lead-out area, a first side having thereon a label indicating at least a recording data, a second side opposite to said first side, and a magnetic substance formed on said outside area of said first side, wherein said optical disk device comprises: an optical reading device positioned adjacent said second side of said optical disk to read signals from said optical disk recording area, and a magnetic sensor positioned adjacent said second side of said optical disk to read said magnetic substance formed on said optical disk outside area, wherein said optical reading device and said magnetic sensor are positioned relative to each other so that such device and sensor do not collide when reading their respective optical disk areas. ### Claim 2 (depends on 1) The optical disk device as defined in claim 1, wherein said magnetic substance is used as one of a magnetic recording medium and a magnetic playback medium. ### Claim 3 (depends on 1) The optical disk device as defined in claim 1, wherein personal information about the owner of said optical disk is recorded on said magnetic substance. ### Claim 4 (depends on 1) The optical disk device as defined in claim 1, wherein said magnetic substance is formed by printing. ### Claim 5 (depends on 4) The optical disk device as defined in claim 4, wherein said magnetic substance is formed on said first side as a pattern of a desired shape by printing. ### Claim 6 (depends on 5) The optical disk device as defined in claim 5, wherein said pattern is circular and is concentric with the optical disk. ### Claim 7 (depends on 5) The optical disk device as defined in claim 5, wherein said pattern is of a radial shape with respect to the optical disk. ### Claim 8 (depends on 5) The optical disk device as defined in claim 5, wherein said pattern is of a bar-code shape. ### Claim 9 (depends on 1) The optical disk device as defined in claim 1, wherein said magnetic substance is formed by silk screen printing using an ink containing a magnetic substance. ### Claim 10 (depends on 1) The optical disk device as defined in claim 1, wherein said optical disk is provided With a lead-in area defined between said central opening and said recording area and wherein said magnetic substance is formed by printing in a region at the inside of said lead-in area. ### Claim 11 (depends on 1) The optical disk device as defined in claim 1, wherein said magnetic substance utilizes at least one of recording and playback for security information. ### Claim 12 (depends on 1) The optical disk device as defined in claim 1, wherein said first side is the top side of the optical disk. ### Claim 13 (depends on 1) The optical disk device as defined in claim 1, wherein said optical disk is a CD-ROM. ### Claim 14 (depends on 1) The optical disk device as defined in claim 1, wherein said optical disk device is an entertainment system, said first side is. ### Claim 15 An optical disk device in combination with an optical disk, said optical disk comprising: a central opening and an outer circumferential edge with a recording area for recording programs defined therebetween, a lead-out area defined between said recording area and said outer circumferential edge, and an outside area defined outside of said recording area and said lead-out area, a first side having thereon a label indicating at least a recording data, a second side opposite to said first side, and a magnetic substance formed on said outside area of said first side, wherein said optical disk device comprises: an optical reading device positioned adjacent said second side of said optical disk o read signals from said optical disk recording area, ad a magnetic sensor positioned adjacent said second side of said optical disk to read said magnetic substance formed on said optical disk outside area, wherein said optical reading device and said magnetic sensor are moved to read the recording, area and the outside area of the lead-out area respectively without colliding with each other.