摘要:
An information recording and reproducing apparatus and an information storage disc for use therewith. The information storage disc has ID storage areas formed in predetermined locations in the radial direction of the disc, the ID storage areas storing either sector or track numbers previously and magnetically. In this setup, if the read head is dislodged from the center line of a given track, the read head still reads the sector number correctly. The information recording and reproducing apparatus has the read head and the write head arranged so that they are positioned on a given intermediate track in a substantially aligned manner. With the write head positioned on a given track, the read head is dislodged from that track only by a negligible distance. This allows the read head to read sector and track numbers unfailingly from the disc.
摘要:
A magnetic disk drive device that includes a disk-shaped medium with a magnetic film formed on a surface for recording or reproducing information, and a magnetic head for recording on and reproducing information from the disk-shaped medium. The disk-shaped medium has a data recording region and a control signal recording region. The data recording region is impressed to have convex recording regions for recording data and concave guard bands for separating adjacent recording regions. The control signal recording region has impressed concavities and convexities representing tracking marks (for effecting tracking control of the magnetic head), track number indicating marks and track numbers (for identifying the tracks), and clock marks dividing one circumference into equal intervals along a path of angular movement of the magnetic head. The disk-shaped medium has reduced track pitch and increased recording capacity because the concave guard bands can be very narrow without inducing crosstalk, and the tracking marks, track number indicating marks, and clock marks are impressed as concavities and convexities along the path of angular movement of the magnetic head.
摘要:
A magnetic disk drive device that includes a disk-shaped medium with a magnetic film formed on a surface for recording or reproducing information, and a magnetic head for recording on and reproducing information from the disk-shaped medium. The disk-shaped medium has a data recording region and a control signal recording region. The data recording region is impressed to have convex recording regions for recording data and concave guard bands for separating adjacent recording regions. The control signal recording region has impressed concavities and convexities representing tracking marks (for effecting tracking control of the magnetic head), track number indicating marks and track numbers (for identifying the tracks), and clock marks dividing one circumference into equal intervals along a path of angular movement of the magnetic head. The disk-shaped medium has reduced track pitch and increased recording capacity because the concave guard bands can be very narrow without inducing crosstalk, and the tracking marks, track number indicating marks, and clock marks are impressed as concavities and convexities along the path of angular movement of the magnetic head.
摘要:
To increase the recording capacity of a magnetic disc, tracks of this magnetic disc are divided into a number of sectors, with each sector being formed from a number of segments. Each segment is basically made up of a data region and a servo region with data being recorded on the data region and a clock pattern which becomes the basis for generation of a clock, a fine pattern which becomes the basis for the tracking operation, and an access pattern which becomes the basis for a seek operation being recorded on the servo region. An ID region and servo region are formed before the data region and servo region which make up the leading segment with the sector ID for this region being recorded in this ID region. After this ID has been read from this ID region, while it is being determined whether or not this ID is the same as the designated ID, the servo operation corresponding to the servo control signal occurring in the servo region is carried out. In this way, the recording of data corresponding to the data in the data region can commence straight after the ID has been decided upon.
摘要:
In an information recording/reproducing apparatus, frame synchronization is speedily performed when initialization is executed or the recording surfaces are switched, and the reliability of recorded data is improved. Segment IDs, each being formed by coding an information word representing a rotational angle measured from a rotational angle origin, are provided within the respective servo areas in such a manner that they are spaced equally in the track direction. While initial synchronization is performed, frame synchronization is established based on the information obtained by decoding the segment ID. This eliminates the need for detecting a home index pattern, thereby speedily performing the initial synchronizing operation. After initial synchronization is achieved, it is constantly monitored whether a frame is not out of synchronization based on the information obtained by decoding the segment ID. When it is detected that a frame is out of synchronization, a suitable operation is performed to minimize the destruction of recorded data.
摘要:
A current measurement apparatus includes multiple GMR elements and a calculation unit. The multiple GMR elements each include a pinned magnetic layer having a pinned magnetization direction, and a free magnetic layer having a magnetization direction to be changed by an external magnetic field. The calculation unit obtains the magnitude of a current to be detected, from outputs of the multiple GMR elements. The multiple GMR elements are disposed in ring shape around a conductor through which the current to be detected flows, and are electrically connected so as to form a series variable resistor by using the multiple GMR elements. The magnetization directions of the pinned magnetic layers are pinned in the same direction when viewed from an extension direction of the conductor at each of the positions of the elements.
摘要:
A vapor deposition mask (70) includes a first layer (71), a second layer (72) and a third layer (73) in this order. A plurality of first openings (71h), a plurality of second openings (72h) and a plurality of third openings (73h) are formed respectively in the first layer, the second layer and the third layer. The first openings, the second openings and the third openings communicate with each other, thereby constituting mask openings (75). The opening dimension of the second openings is larger than the opening dimension of the first openings and is larger than the opening dimension of the third openings. With this configuration, it is possible to prevent reduction of the opening dimension of the mask openings or clogging of the mask openings due to the vapor deposition particles adhering to the mask openings.
摘要:
A deposition mask is used to pattern a thin film 3 on a substrate 10 by depositing deposition particles through a plurality of openings K having a stripe pattern. The deposition mask includes a frame 65; a plurality of mask layers 70 provided in the frame so as to overlap each other; and a support layer 71 provided between the mask layers 70. Each of the mask layers 70 is formed by arranging a plurality of mask wires 72 in a stripe pattern in a tensioned state, and the support layer 71 is formed by arranging a plurality of support wires 74 in a tensioned state so as to cross the mask wires 72. A plurality of gaps 73 in each of the plurality of mask layers 70 overlap each other to form a plurality of through gaps 73a that linearly extend through all of the plurality of mask layers 70. The openings K are formed by the through gaps 73a.
摘要:
A deposition mask 601 is used to form a thin film 3 in a prescribed pattern on a substrate 10 by deposition. Each of a plurality of improved openings 62A of the deposition mask 601 has a protruding opening portion 64, and is formed so that the opening amount at an end in a lateral direction is larger than that in a central portion in the lateral direction. In a deposition apparatus 50, the deposition mask 601 is held in a fixed relative positional relation with a deposition source 53 by a mask unit 55. In the case of forming the thin film 3 in a stripe pattern on the substrate 10 by the deposition apparatus 50, deposition particles are sequentially deposited on the substrate 10 while relatively moving the substrate 10 along a scanning direction with a gap H being provided between the substrate 10 and the deposition mask 601.
摘要:
A carriage-type conveyance device using a carriage having a vertically movable object-supporting base that is controlled by a cam rail on the floor side, in which a turntable for changing the direction of the carriage has a low-floor structure. In the carriage-type conveyance device, the object-supporting base that is vertically movable between a lowered position and a lifted position is placed on a conveyance carriage (1), a cam follower roller vertically moving in association with the movement of the object-supporting body is provided at the bottom of the conveyance carriage (1), and a cam device (58) for pushing up the cam follower roller and a work section (3A) in which the object support base is supported at the lifted position are provided in a traveling route of the conveyance carriage (1). The conveyance device further has the turntable (7) placed in a traveling route on the downstream side of the work section (3A) and changing the direction of the conveyance carriage (1), and also has a means for holding at the lifted position the object-supporting body of the conveyance carriage (1) from at least the time immediately before the object-supporting body enters into the turntable (7) until it has exited from the rotated turntable (7).