摘要:
A magnetic recording and reproduction device having magnetic heads opposing each other across a magnetic disk. The heads have shaped control portions to generate a negative pressure between the magnetic heads and the magnetic disk. Each magnetic head is supported by an elastic member which is structured to be slightly dislocatable by the negative pressure. The magnetic heads are caused by the negative pressure to come in sliding contact with both sides of the magnetic disk, thereby obtaining positive sliding contact with extremely small contact resistance between the magnetic heads and the magnetic disk and achieving a good head contact while minimizing abrasion of the magnetic disk and the magnetic heads. The control portions to generate the negative pressure are formed integrally with the magnetic heads, thus simplifying the structure, reducing the manufacturing steps such as positioning procedures and achieving a reduction in cost.
摘要:
A magnetic head having a control portion provided integrally with an opposing surface located opposing the recording surface of a magnetic disc or a head mount for generating a negative pressure between the control portion and the magnetic disc to attract the magnetic disc towards the magnetic head, thereby generating an adequate and sufficient negative pressure in the vicinity of the magnetic head and achieving a good head touch. This configuration enables compact design of the mechanism and an increased recording area of the magnetic disc compared with the case in which a magnetic head and a negative pressure generation type stabilizing plate to attract the magnetic disc towards the magnetic head are separately disposed, and eliminates the need for procedures for separate positioning of the individual magnetic head and stabilizing plate, thereby achieving a considerable reduction in manufacturing steps and production cost.
摘要:
A magnetic head having a control portion provided integrally with an opposing surface located opposing the recording surface of a magnetic disc or a head mount for generating a negative pressure between the control portion and the magnetic disc to attract the magnetic disc towards the magnetic head, thereby generating an adequate and sufficient negative pressure in the vicinity of the magnetic head and achieving a good head touch. This configuration enables compact design of the mechanism and an increased recording area of the magnetic disc compared with the case in which a magnetic head and a negative pressure generation type stabilizing plate to attract the magnetic disc towards the magnetic head are separately disposed, and eliminates the need for procedures for separate positioning of the individual magnetic head and stabilizing plate, thereby achieving a considerable reduction in manufacturing steps and production cost.
摘要:
A regulating plate disposed opposite to a magnetic head with respect to a rotary flexible magnetic disk and in sliding contact with the flexible magnetic disk, having protruding portions provided on the regulating plate at upstream and downstream sides of the magnetic head, top portions of the protruding portions being formed to flat surfaces, thereby obtaining stable sliding contact of the magnetic head with the flexible magnetic disk from the beginning, and a thin film magnetic head comprised at least of a magnetic layer, a coil conductor layer, and an insulative layer formed on a substrate, and a protective layer stacked on the magnetic layer, characterized in that the protective layer comprises MgO, SiO.sub.2, and Al.sub.2 O.sub.3.
摘要翻译:调节板,相对于旋转的柔性磁盘与磁头相对设置并与柔性磁盘滑动接触,在磁头的上游侧和下游侧具有设置在调节板上的突出部分,突出部分的顶部 部分形成为平坦表面,从而从头开始获得磁头与柔性磁盘的稳定的滑动接触,以及至少包括磁性层,线圈导体层和绝缘层的薄膜磁头, 衬底和层叠在所述磁性层上的保护层,其特征在于,所述保护层包括MgO,SiO 2和Al 2 O 3。
摘要:
A methacrylic resin monomer composition comprising at least one of each of the following (A) to (C): (A) a methyl methacrylate monomer and/or a syrup thereof; (B) a compound represented by the general formula (1); and (C) a radical initiator, wherein, in the formula, R1 and R3, and R2 and R4 represent hydrogen atoms or methyl groups at the same, respectively. The composition can provide a crosslinkable methacrylic resin which is improved in resin properties such as heat resistance, rigidity, low water absorption, chemical resistance and the like without deteriorating high transparency a PMMA originally has. A transparent member and an optical member composed of such a resin are also disclosed.
摘要:
There is disclosed a chuck adapted to be attached to the spindle of a machine tool, for gripping an intended tool, comprising a chuck barrel adapted to grip an intended tool and having a conical outer peripheral surface and not having slots extending along the generating lines thereof, a clamp ring fitted over said chuck barrel, and a number of rollable bodies in the form of needle rollers interposed between said clamp ring and said chuck barrel and inclined at a fixed angle with respect to the generating lines, the arrangement being such that when said clamp ring is manipulated for rotation, said rollable bodies spirally revolve around the axis of the chuck barrel along the conical peripheral surface thereof while rotating around their own axes, thereby effecting the contraction and configurational restoration of the chuck barrel, said chuck being characterized in that a restraining ring is attached to the outer peripheral surface of said clamp ring and rollable bodies, particularly in the form of needle rollers, are interposed between said restraining ring and said clamp ring, thereby restraining said chuck barrel from developing a flection deformation when said chuck barrel is contracted and restraining said clamp ring from developing a restoration deformation as it tends to radially expand by the reaction due to the contracting force, thereby increasing the power for gripping the tool.
摘要:
A 3-D coordinate measurement is performed in such a way that an electrooptical distance-measuring device is used to measure a linear distance to a target point set on a surface of a measurement object, an angle measuring device is used to measure shifted angles of an optical axis of the electrooptical distance-measuring device, and a 3-D coordinate of the target point is measured according to a measured distance and a measured angle after the optical axis of the electrooptical distance-measuring device has been aligned to the target point. The present method includes a coordinate recognizing step for observing a plurality of targets, recognizing a plurality of target points, and calculating approximate 3-D coordinates of the target points; a macroscopic sighting step for approximate aligning the optical axis of the electrooptical distance-measuring device; and a microscopic sighting step for aligning the optical axis of the electrooptical distance-measuring device to the one of the target points in the predetermined viewfield range.
摘要:
Described are a high-speed polymerizable resin composition and a lens obtained from it. The composition comprises:a) at least 70 but smaller than 90 parts by weight of a mixture composed of:i) an aromatic polyisocyanate compound represented by the following formula (I): ##STR1## wherein R represents a hydrogen atom or a methyl group, and ii) a polythiol having at least 3 mercapto groups per molecule and a sulfur content of at least 40 wt. %; andb) at least 10 but smaller than 30 parts by weight of a compound which has, in a molecule, at least one functional group selected from a hydroxyl group or a mercapto group and also at least one functional group selected from an acrylic group, methacrylic group or styrylic group, said composition containing isocyanato groups.
摘要:
The present invention provides a hydrophilic film that has high adhesion to inorganic materials and is safer and excellent in transparency and also exhibits both very high hydrophilicity and abrasion resistance, and also provides a laminate including the hydrophilic film. The hydrophilic film is produced by applying a specific hydrophilic compound (c) having an acryloyl group and a potassium sulfonate group or the like to a surface of a layer formed from a mixture containing a silane compound (a) including one silicon atom, a mercapto group or the like, and at least one silicon-bonded group selected from the group consisting of an alkoxy group, a halogen group, and a hydroxy group, and a silane compound (b) including at least four silicon-bonded groups selected from the group consisting of an alkoxy group, a halogen group, and a hydroxy group and not including groups reactive with a carbon-carbon double bond, and allowing a reaction between at least a part of acryloyl groups contained in the hydrophilic compound (c) and at least a part of mercapto groups derived from the compound (a).
摘要:
The guanidine derivative represented by the formula [III], ##STR1## (commonly known under the name "Cimetidine") is produced by reaction of the compound represented by the formula [I], ##STR2## with a compound represented by the formula [II], ##STR3## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, is each hydrogen atom, a lower alkyl group, phenyl group, or a radical of --OR.sub.7 or --COOR.sub.7, in which R.sub.7 is hydrogen atom, a lower alkyl group or an alkali metal, followed by reaction with methylamine.