Optical information storing carrier


PURPOSE: To detect accurately the number of mobile tracks even in case an optical spot passes over the retrieving signal, by forming a retrieving signal part with a part having the groove width (a) equal to a guide groove part and a part having the groove width (b) and satisfying the specific relation to a track pitch P. CONSTITUTION: For a light spot guide layer 43 consisting of a guide groove part 45 having recesses and projections and a retrieving signal part 48, a track 50 through which the light spot follows is formed with the projection parts when viewed from a lens 47 which condenses the light spot. The part 48 is used as a part of the track 50 and at the same time the part 48 includes a part 48a having the groove width (a) and a part 48b of the groove width (b) against the groove width (a) of the part 45. Thus the relation 'a - P/2 = P/2 - b' is satisfied to a track pitch P. As a result, the track control signal 53 is not affected even though a light spot passes over the part 48. Thus the accurate number of mobile tracks can be detected in case the information is retrieved at a high speed by means of a groove counting method. COPYRIGHT: (C)1987,JPO&Japio




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Cited By (12)

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    JP-H0512677-AJanuary 22, 1993Sharp Corp, シヤープ株式会社光記録媒体駆動装置
    JP-H06301976-AOctober 28, 1994Matsushita Electric Ind Co Ltd, 松下電器産業株式会社光ディスクと光ディスク装置
    JP-H09237423-ASeptember 09, 1997Sharp Corp, シャープ株式会社光記録再生装置
    US-5469416-ANovember 21, 1995Sony CorporationApparatus for reproducing recorded data and selectively either of read-only or recorded synchronization information from a magneto-optical recording medium
    US-5508996-AApril 16, 1996Sony CorporationOptical disc having an offset tracking groove for representing multi-value digital information signals and reproducing apparatus therefor
    US-5587901-ADecember 24, 1996Sony CorporationOptical recording medium having a pre-formed recording track which is offset along its width to record frame sync signals of information
    US-5949746-ASeptember 07, 1999Sony CorporationMethod for reproducing information recorded on an optical recording medium having a pre-formed recording track which is offset along its width to record frame sync signals of the information recorded on the medium
    US-6800348-B2October 05, 2004Sony Corporation, Fujitsu, Ltd.Optical recording medium
    US-7100680-B2September 05, 2006Thermal Corp.Integrated circuit heat pipe heat spreader with through mounting holes
    US-7321544-B2January 22, 2008Fujitsu LimitedOptical recording medium including identification region constituted of protrusions and recesses
    WO-02063615-A1August 15, 2002Fujitsu LimitedSupport d'enregistrement d'informations
    WO-9963534-A1December 09, 1999Sony Corporation, Fujitsu LimitedOptical recording medium