Abstract:
PROBLEM TO BE SOLVED: To provide a holographic data storage system using an SLM having a PDLC optical element. SOLUTION: The holographic data storage system includes a spatial light modulator device (SLM) that comprises optical elements in the form of polymer dispersion liquid crystal (PDLC) elements. The PDLC elements are individually controllable and can be made substantially transmissive or substantially diffusive. The "on" or "off" state of the PDLC element is defined whether the given PDLC element is transparent or diffusive. Additional states may also be defined for the PDLC element, e.g., based on a level of diffusiveness of the PDLC element. Also, a mirror layer may be added adjacent to the PDLC element to demarcate a reflective mode SLM. In any case, the SLM is used to encode bit maps into a holographic object beam. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a single reel data storage tape cartridge with an internal tape guide. SOLUTION: The single reel data storage tape cartridge includes a housing having a tape access window. A single tape reel assembly is rotatably disposed within the housing and includes a hub about which a storage tape is wrapped. The tape guide is disposed within the housing adjacent to the single tape reel assembly while opposing the tape access window, and is configured to define a pathway of the storage tape from the single tape reel assembly to the tape access window and limit lateral motion of the storage tape. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide bias techniques for magnetic tape media.SOLUTION: The disclosure is directed to a method for creating a remanence magnetization on a magnetic tape medium. The magnetic tape is first substantially demagnetized, e.g., erased, by an erasure unit having multiple magnetic elements of alternating polarity. The erased magnetic tape is then passed by a bias magnet that creates a remanence magnetization on the magnetic tape. The remanence magnetized magnetic tape is then passed through a servo write head that writes servo patterns to the remanence magnetized magnetic tape. The bias magnet may be housed within the erasure unit or within a bias unit, and the distance between the bias magnet and the tape path of the magnetic tape may be adjustable to create the desired remanence magnetization on the magnetic tape. The remanence magnetization created on the magnetic tape may be greater than 20 percent to reduce defects in the servo pattern written to the magnetic tape.
Abstract:
PROBLEM TO BE SOLVED: To provide a recording-medium driving device in which an external connection part of a recording medium side is surely connected to a terminal member of the driving-device side even if a medium casing is inserted in a unusual state. SOLUTION: When a medium casing 1 is moved deep into a device, a reference guide pin 33 with a longer length provided in a driving-device body 20 is first inserted into a first positioning hole 6a of the medium casing 1 and a subsidiary guide pin 34 is subsequently inserted into a positioning hole 6b. By this, the medium casing 1 is guided deep into the device (Y1 direction) on the basis of the reference guide pin 33 having a greater diameter. Therefore, even if the medium casing 1 is inserted in a displaced state in a direction orthogonal to the insertion direction, such displacement can be compensated gradually together with the movement of the medium casing 1. This ensures proper connection between a plurality of external terminals of the medium casing 1 and a plurality of connector pins 32 of the driving-device body 20. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a magnetic recording medium defining a recording surface having improved smoothness characteristics. SOLUTION: The magnetic recording medium includes a substrate, a support layer and a magnetic recording layer. The substrate defines a first surface. The support layer is formed over the first surface of the substrate. The magnetic recording layer is formed over the support layer and has a resistivity less than about 1×10 8 ohm/square. The magnetic recording layer defines a recording surface opposite the support layer. The recording surface has an average roughness of less than about 2.5 nm. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide guide arrangements of a data storage tape guiding system. SOLUTION: The invention is directed to arrangements of tape guides which can improve the guiding of data storage tape. Tape guides having specific sizes relative to the data storage tape are also disclosed. The disclosed tape guides and arrangements of tape guides can improve the ability to properly guide the data storage tape, e.g., during media fabrication, servo recording or readout, data recording or data readout. The invention is particularly useful for a magnetic tape, but may also find application with optical tape, holographic tape, or other formats of data storage tape. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide holographic media fabrication techniques. SOLUTION: Holographic data storage media are described in which a holographic recording material is sandwiched between two substrates. The holographic media formulation is often formed of two or more components mixed to obtain a homogeneous formulation. The holographic media formulation may include two or more components which are mixed together prior to injection between the substrates. Curing of the holographic media formulation is substantially avoided during mixing, yet accelerated after the formulation is injected between the substrates. Accordingly, the system and techniques can be used to improve the large scale manufacturability of such media by allowing for fabrication of such media within reasonable cycle times, such as less than one minute, while adhering to stringent requirements for optical clarity and parallelism. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a tape reel assembly with radially symmetricaly deforming tape winding surface. SOLUTION: This tape reel assembly has a hub. The hub includes a cylindrical core, an annular arm, and a web. The cylindrical core demarcates a drive side and a top side. The annular arm is co-axially disposed exterior to and separated from the cylindrical core. Additionally, the annular arm demarcates a tape winding surface bisected by a center line into a top half opposite the drive side and a bottom half adjacent the drive side. The web extends from the top side of the core, and a web center connects to the annular arm at a point in the top half. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a magnetic recording medium wherein a signal-to-noise ratio is increased in a high-density broadband. SOLUTION: A dual-layer magnetic recording medium includes a nonmagnetic substrate having a front surface and a back surface, a lower support layer formed over the front surface, and a magnetic upper recording layer formed over the lower layer. The magnetic layer contains magnetic metallic pigment particles having at least a saturation coercivity of about 2,000 oersted (Oe), and a binder system for a pigment. The magnetic recording medium exhibits a square ratio greater than 0.84, a front coating Wyko Ra (average roughness) value of less than 5.5 nm, preferably, less than 4.0 nm, and has a BBSNR of greater than 11dB at 151kfci. COPYRIGHT: (C)2005,JPO&NCIPI