Abstract: The position of a feed shaft is monitored, the mean moving speed and moving frequency of the feed shaft are measured with every unit time for position correction, and a correction amount &dgr;n is determined from the speed and frequency according to an approximation formula and updated (c7 and c8). A position correction amount for a commanded position is determined from this correction amount, and the commanded position is corrected by the position correction amount (c1 to c6). The position correction amount for the commanded position is determined from this correction amount, and the commanded position is corrected by this position correction amount. Since the correction amount is determined according to the approximation formula, thermal displacement correction can be effected at all times without requiring any sensor.

Abstract: A light emitting device for focusing a laser beam without adopting an optical lens system is provided, as well as a composite magnetic recording head and a magnetic recording device, which realize a smaller laser spot diameter and a sharp magnetic field distribution, whereby an optical-assisted high density magnetic recording can be realized, and which also realize a simplified head structure, and improvements in productivity and costs. The composite magnetic recording head is prepared by integrally forming a magnetic coil layer for use in magnetic recording at around the center of the surface-emitting laser aperture, and further, a shielding plate is formed at the center of the laser aperture.

Abstract: The present invention provides a thermally assisted magnetic recording medium consists of a recording region for recording information including a recording layer and a carbon nitride film provided on a side from which light is incident with respect to the recording layer, wherein the recording region is locally heated using light as a heat source for magnetically recording and reproducing information.

Abstract: A magnetic signal recording method of the present invention superimposes a recording edge of a recordable region on a region where there is substantial equality between (a) a coercive force in a region on a magnetic recording medium in which the coercive force has been varied, and (b) magnetic field intensity, which is generated by a magnetic recording head. The magnetic field intensity has a magnetic field distribution whose lowering rate in an in-track position is maximum in the region. The magnetic recording head, whose recording magnetic field is distributed in a rectangular shape, is used in this way so as to form a magnetic bit having a rectangular shape that is suitable for reproduction performed by a common reproduction head having a rectangular reproduction region, thereby improving an S/N of a reproduction signal dramatically.

Abstract: A cathode ray tube which comprises a front panel coated with a nonglare film having a multi-layered structure. The multi-layered structure comprises at least a visible light absorbing layer containing a black dye, and an antistatic layer containing an inorganic metal compound as a conductive agent.

Abstract: In a machine tool controlled by using a numerical control device, a correction amount is determined for thermal displacement due to heat generation and heat conduction in a spindle motor and a feed shaft motor, in addition to thermal displacement due to heat generated by rotation of a spindle and a feed shaft. A tool position is corrected based on the correction amount. An entire stroke of the feed shaft is divided into a finite number of sections, and for each section, a correction amount for thermal displacement due to axial movement of the feed shaft is determined. The tool position is corrected based on the determined correction amount.

Abstract: An information write/read head writes or reads information on or from recording tracks by the heat-assisted system. The information write/read head includes a magnetic head provided in such a manner that a longitudinal direction of a magnetic gap crosses a scanning direction. Further, the information write/read head includes an aperture slit having a length of not less than a diffraction limit of a light beam, and a width shorter than the diffraction limit in the direction orthogonal to the recording track, which is formed in such a manner that the longitudinal direction thereof is aligned in a scanning direction of the recording track.

Abstract: An information recording and reproducing device includes a magnetic information detecting section for magnetically detecting magnetic information recorded at a given position on a recording medium, an optical information detecting section for optically detecting optical information recorded at a given position on each track of the recording medium, and a positional control section for controlling a position on the track using the detected magnetic information and optical information.

Abstract: An image processing apparatus which allows for information search from items arranged in virtual space, includes: an intra-visual field polygon discriminating means for determining the polygons constituting the surfaces of 3D shapes displayed in the visual field; a polygon data storing means for storing the polygons which were determined to be within the visual field by the intra-visual field polygon discriminating means; a pre-observed polygon identifying means for judging whether currently observed polygons are the same as those stored in the polygon data storing means; and a display processing means for changing the display state of polygons which have been determined to have been priorly seen.

Abstract: The present invention is a magnetic signal reproducing device for reproducing information from a magnetic recording medium in which a polarity of magnetization is inverted at a first temperature during temperature change. The device includes local temperature raising device for locally raising the temperature of the magnetic recording medium, and reproducing device for magnetically detecting information recorded on the magnetic recording medium. In the device, during a reproducing operation, the local temperature raising device forms an area having a lower temperature than the first temperature and an area having a higher temperature than the first temperature within an area in the magnetic recording medium, thereby reducing contribution to reproduced signal from magnetization of an area other than a reproduction target area.

Abstract: A composite magnetic head device includes a recording head and a reproducing head for magnetically recording and reproducing information on and from a recording medium, and further includes heat sources for heating the recording medium when recording and reproducing. As the heat sources, diffraction grating patterns for the recording head and the reproducing head are formed independently. With this structure, when recording and reproducing information based on the thermal distribution of the recording medium heated by the heat sources, the thermal damage on the recording medium can be suppressed, and the likelihood of such problem that the recording medium is heated too much and the information recorded in the heated portion are erased can be prevented.

Abstract: A fixed first sleeve and a movable second sleeve are arranged in a center through hole of a main spindle. Balls at the rear end of the second sleeve engage a recessed slope of the first sleeve and a recessed slope of a draw bar, thereby amplifying the urging force of a spring for urging the draw bar upward. Balls at the distal end of the second sleeve hold and pull in the head of the pull stud with the amplified force. The pull stud has an axial through hole and a hole that connects with the through hole and opens sideways. Compressed air passes through these holes, thereby cleaning the respective taper surfaces and end faces of the main spindle and a tool shank. Switching means is used to close the hole that opens sideways, whereby a cutting fluid is allowed to flow through the axial through hole only.

Abstract: A media selecting device enabling a user to easily select any desired one of a plurality of selectable media. The media selecting device according to the present invention can easily select any one of a plurality of hierarchically-related icons by turning a rotary disk-type knob. The user presses a first change-over button to access the icon selected by the disk-type knob, and to display icons of a lower hierarchical layer or to display a deciding medium represented by icons. The user can press a second change-over button to cancel the selected icon, and to display icons of an upper hierarchical layer. Furthermore, the displayed icons have different three-dimensional shape and location information, and are disposed in a three-dimensional virtual space, thus increasing visibility and control of the device.

Abstract: A plasma addressing display device of the present invention includes: a plasma addressing substrate; a color filter substrate; and a display medium layer interposed between the plasma addressing substrate and the color filter substrate is provided. The plasma addressing substrate includes: a first substrate; a dielectric sheet provided near the display medium layer; a plurality of electrode lines provided at regular intervals on the first substrate; a plurality of partition walls provided respectively on the plurality of electrode lines; and a plurality of strip plasma discharge channels each enclosed by the first substrate, the dielectric sheet and the partition walls. The color filter substrate includes: a second substrate; a color filter layer provided on the second substrate; a plurality of strip electrodes provided on the color filter layer so as to extend in a direction orthogonal to the plurality of strip plasma discharge channels.

Abstract: A mold for molding a drum shaped magnetic core having two flanges connected by a coil winding core portion. The mold includes a die defining a cylindrical cavity having an inner diameter substantially equal to an outer diameter of the flanges. A pair of die inserts are movable in an orthogonal direction relative to the cylindrical cavity and define a diameter of the coil winding core portion of the drum shaped magnetic core. The diameter of the coil winding core portion is smaller than the outer diameter of the flanges. An upper punch and a lower punch are inserted into the cylindrical cavity from a corresponding end opening of the mold such that each forms a flange. A central punch is disposed coaxially within one of the punches to form the coil winding core portion.

Abstract: The image compositing apparatus includes: a texture image storage device for storing as a texture image the image of a three-dimensional polygon object viewed in the direction of its depth from a predetermined angle of view; a three-dimensional positional inputting device for inputting the movement of the view point from which the three-dimensional polygon object is viewed in the direction of its depth from the predetermined angle of view; and a display image generating device which, in accordance with the movement of the view point obtained from the three-dimensional positional inputting device, generates a display image by modifying the polygon onto which an image viewed in the direction of its depth from the predetermined angle of view is mapped, in such a manner that the perspective of the image viewed in the direction of its depth from the predetermined angle of view will be aligned with the perspective of three-dimensional polygon object viewed in the direction of its depth from the predetermined angle

Abstract: In an optical information recording-reproduction apparatus, a focus servo control circuit generates a focus error signal and a light beam is accurately converged on a surface of an optical disk according to a focus servo control signal based upon the focus error signal. In accordance with the present invention, the focus error signal is compensated by selecting a land section focus offset amount by a switch when land sections are tracked, and it is compensated by selecting a groove section focus offset amount when groove sections are tracked. As a result, since the land sections and the groove sections are controlled by different focus servo control signals, recording and reproducing operations are carried out at the most optimal focusing positions respectively obtainable, thereby making it possible to significantly improve the quality of a reproduced signal.

Abstract: A disk-shaped recording medium has a groove only one of whose side-walls wobbles or deviates in radial directions of the disk in order to prerecord first address information. In addition, the disk medium has block areas in the groove and in the land where the first address information is given and sector areas provided with second address information for every piece of recording data which is divided into predetermined lengths, wherein `m` pieces of sector areas are allocated for `n` pieces of block areas and recorded in the groove and the land (both n and m are integral numbers, and n is smaller than m). The second address information based on the first address information enables the sectors to be set at any length, and improves reliability of the address information. Moreover, the second address information realizes high density recording using both the land and the groove.

Abstract: A disk-shaped recording medium has a groove only one of whose side-walls wobbles or deviates in radial directions of the disk in order to prerecord first address information. In addition, the disk medium has block areas in the groove and in the land where the first address information is given and sector areas provided with second address information for every piece of recording data which is divided into predetermined lengths, wherein `m` pieces of sector areas are allocated for `n` pieces of block areas and recorded in the groove and the land (both n and m are integral numbers, and n is smaller than m). The second address information based on the first address information enables the sectors to be set at any length, and improves reliability of the address information. Moreover, the second address information realizes high density recording using both the land and the groove.

Abstract: A method of manufacturing the cathode ray tube comprises, cleaning the front panel, heating for drying the front panel, forming an visible light absorbing layer on the front panel by spraying a first ethyl silicate solution, forming the antistatic layer on the front panel by spraying a second ethyl solution, and baking the front panel to harden the nonglare film.