摘要:
Protective coating composition which comprises dispersed fine particles of one or more of compounds selected from a metal salt of a higher fatty acid, a higher fatty acid having a melting point of 40.degree.-90.degree. C., and a wax having a melting point of 40.degree.-90.degree. C. in an aqueous solution of a water-soluble film base and a surface-active agent having an HLB value of about 1.7 to 8.6 or silicon oil.
摘要:
A prism and an optical pickup employing such prism includes a parallel prism having a polarization beam splitter film and a reflection film. The polarization beam splitter film is formed on an angled plane of a glass material having an approximate parallelogram cross-section, and consists of a multi-layer film of a composite film made of Si and SiO.sub.2-x (x
摘要:
A thin film magnetic head device to be equipped on a magnetic recording and reproducing system can meet a plurality of recording formats and carry out stabilized recording/reproducing without depending on the running direction of the magnetic tape. There are combined either of at least two thin film magnetic heads for recording each having on a substrate a recording transducer for recording information on a magnetic tape or two thin film magnetic heads for reproducing each having a reproducing transducer for reading out information recorded on a magnetic tape or two thin magnetic heads for recording and reproducing .in which the recording transducer and the reproducing transducer exist together. According to the running direction of the magnetic tape, only the thin film magnetic head Which is situated at the downstream side in the running direction of the magnetic tape is activated to be always in an operating condition.
摘要:
A thin film magnetic head includes an upper magnetic layer comprising a first yoke, a portion of which is divided into front and rear sections and which is provided near the divided sections with a magneto-resistive element, a second yoke provided adjacent to the opposite ends of the first yoke in a widthwise direction of a recording track and a third yoke provided between the first yoke and the second yoke and having a larger magnetic reluctance than those of the first and second yokes. In the above constitution, the first, second and third yokes can be mainly used in recording to record in an area of a large width on the recording medium, and only the first yoke can be used in reproducing to reproduce in an area of a small width on the recording medium, so that the reproducing output is not reduced when the recording medium experiences a running deviation.
摘要:
A magnetic recording and reproducing apparatus of the invention comprises a measuring unit for measuring a space between a recording head and a reproducing head, a detecting unit for detecting a position of a front one of record magnetization reversal units in a data domain, and a recording unit for recording in a corresponding manner with the record magnetization reversal units. The magnetic recording and reproducing apparatus of this structure can perform excellent recording on a patterned medium by virtue of providing a proper timing from the front record magnetization reversal unit.
摘要:
In accordance with the present invention, in a magnetic recording medium for perpendicular magnetic recording, a recording characteristic which is not inferior to that of double-layer medium and a resolution of reproduction which is not inferior to that of single layer medium are provided. On a non-magnetic substrate, a soft magnetic layer for increasing a perpendicular component of recording magnetic field in a perpendicular magnetic recording layer is formed. A non-magnetic layer for suppressing extension of signal magnetic field loop from recording magnetization in the perpendicular magnetic recording layer is formed on the soft magnetic layer. The perpendicular magnetic recording layer is formed on the non-magnetic layer. The non-magnetic layer has a thickness required to effectively reduce the signal magnetic field loop. The required thickness exceeds 20 nm.
摘要:
In an integrated thin film magnetic head, a write pole or inductive head I.sub.h includes first and second magnetic cores magnetically coupled to form a magnetic circuit and a coil formed between the first and second magnetic cores. An MR element read pole or MR head MR.sub.h includes first and second yokes, an MR element and a bias conductor for applying a biasing magnetic field on the MR device, and the first magnetic core or the second magnetic core constitutes the second yoke.
摘要:
A magnetic head for multi-track data recording on magnetic tape is formed of a combination of two head modules, each having a linear array of thin-film transducer elements formed on a substrate, each of these arrays consisting of a mixture of write elements and read elements. These are positioned on the respective head modules such that when the head modules are combined with the substrates mutually opposing, pairs of transducer elements are formed for respective tape tracks, each pair consisting of a read and a write element. "Read-after-write" recording confirmation can thereby be implemented together with bidirectional recording operation, by using only a combination of two head modules.
摘要:
An enteric-soluble composition for coating drugs and the like comprises a conventional enteric-soluble polymer in admixture with a polyanionic polymer which is soluble at low pH values. By altering proportions and types of both polymer, it is possible to alter the pH value at which the composition will disintegrate to release the drug or the like.