Abstract: A magnetic head which can apply magnetic fields in opposite directions from each other within a beam spot formed on a magneto-optical disk. This magnetic head includes two cores located in close proximity and two coils. The level of the magneto-optical signal output from the optical head becomes greater as a function of deviation of the center of the magnetic head from the center of the laser beam. Therefore, the magnetic head is moved in the tracking direction or the track direction so that the level of the magneto-optical signal becomes 0.

Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.

Abstract: A magneto-optical head includes an optical member, objective lens, SIL and coil. The magneto-optical head converts a laser beam to an evanescent light and directs it to a magneto-optical recording medium. Further, the magneto-optical head applies a magnetic field to the magneto-optical recording medium. When tilt is caused, it decreases the tilt angle. The optical member refracts the laser beam to a prescribed direction to be directed to the objective lens when the laser beam is displaced from a designed optical axis. The objective lens allows the laser beam to be focused onto a point on an end face of the SIL. Further, the SIL emits the evanescent light. The optical member is arranged in contact with the optical member. As a result, a signal can accurately be recorded or reproduced even when tilt is caused to an optical disk while alleviating the problem associated with the tilt.

Abstract: A magneto-optic recording medium reproduction device includes a multi-clad, step index optical fiber, a semiconductor laser arranged on one end surface side of the optical fiber for providing laser beam to one end surface of the optical fiber, a photodetector arranged on one end surface side of the optical fiber and receiving laser beam from one end surface of the optical fiber, and a magnetic head for applying an alternating field to the magneto-optic recording medium. Since the other end surface of the optical fiber is arranged adjacent to the magneto-optic recording medium, an accurate signal can be reproduced even from an extremely small recorded domain. Furthermore, since an alternating field is applied to the magneto-optic recording medium, a domain transferred from a recording layer of the magneto-optic recording medium to a reproducing layer is expanded and a large reproduced signal can be obtained from the expanded domain.

Abstract: A magneto-optic disk and a recording/reproduction device therefor adopt optical super-resolution to increase recording capacity. More specifically, the magneto-optic disk has an heat emitting layer (6) on a recording layer (4) and still preferably has an intermediate layer (8) between a reproduction layer (3) and the recording layer (4). The recording/reproduction device includes a circuit (33) for pulsing a laser beam to be radiated to the magneto-optic disk and still preferably includes a polarization rotating unit (50) and a polarizing filter (51) for blocking only the center of the laser beam in reproduction. The heat emitting layer (6) diffusing any heat generated by the laser beam, and the discontinuously radiated laser beam allow small recording domain. The laser beam having its center blocked forms smaller main lobe due to diffraction effect.

Abstract: A magneto-optic recording medium reproduction device includes a multi-clad, step index optical fiber, a semiconductor laser arranged on one end surface side of the optical fiber for providing laser beam to one end surface of the optical fiber, a photodetector arranged on one end surface side of the optical fiber and receiving laser beam from one end surface of the optical fiber, and a magnetic head for applying an alternating field to the magneto-optic recording medium. Since the other end surface of the optical fiber is arranged adjacent to the magneto-optic recording medium, an accurate signal can be reproduced even from an extremely small recorded domain. Furthermore, since an alternating field is applied to the magneto-optic recording medium, a domain transferred from a recording layer of the magneto-optic recording medium to a reproducing layer is expanded and a large reproduced signal can be obtained from the expanded domain.

Abstract: The invention relates to a dispersion compensating optical fiber which is connected to a single-mode optical fiber having zero dispersion in the wavelength of 1.31 &mgr;m and has both a dispersion compensating function and a function serving as an optical transmission line, wherein the distribution of refractive indexes of dispersion compensating optical fiber is of W-type profile, the dispersion value in the wavelength of 1.55 &mgr;m is in a range from −20 ms/nm/km or more to −10 ps/nm/km or less, the ratio of dispersion slope to the dispersion value in the wavelength of 1.55 &mgr;m is set to almost the same as the absolute value of the ratio of dispersion slope with the dispersion value in the same wavelength of 1.55 &mgr;m of the single-mode optical fiber while the positive and negative codes thereof are inversed, the specific refractive index difference &Dgr;+ of center core 1 to clad 3 is in the range from 1.0% or more to 1.

Abstract: The present invention provides a dispersion compensating optical fiber, connected to a transmission single-mode optical fiber having zero dispersion in a 1.3-.mu.m wavelength band, for efficiently compensating for the dispersion of a light signal of a 1.55-.mu.m wavelength band. The refractive index configuration is such that the refractive index profile is a W type and that the dispersion value is a high negative value of not more than -80. The ratio Ra (Ra=a/b) of the diameter a of a core 1 and the diameter b of a side core 2 is set within a range of not less than 0.33 and not more than 0.37. The ratio DPS(SMF)/DPS(DCF) of a value DPS(SMF) obtained by dividing the dispersion value of the transmission single-mode optical fiber in the 1.55-.mu.m wavelength band by the dispersion slope of the transmission single-mode optical fiber in the 1.55-.mu.m wavelength to a value DPS(DCF) obtained by dividing the dispersion value of the dispersion compensating optical fiber in the 1.55-.mu.

Abstract: In magneto-optical recording medium, on a transparent substrate of polycarbonate resin, an SiN film having the thickness of 600 to 800 .ANG. and surface roughness Rmax of at most 10 nm is formed. On the SiN film, a GdFeCo reading layer having the thickness of 800 to 1200 .ANG. with Gd content of 30 to 36 at. % and Co content of 12 to 50 at. % is formed. On the reading layer, a TbFeCo recording layer of which Co content is 10 to 16 at. % is formed. The recording layer is a perpendicular magnetization film, and the reading layer is an in-plane magnetization film. At the time of reading, the reading and recording layers are heated, and the direction of magnetization of the recording layer is transferred to the reading layer only in the prescribed heated area. Information can be read only from the transferred portion, and thus a super resolution effect is obtained. When Kerr rotation angle .theta..sub.

Abstract: An information recording and reproduction apparatus for a magnetically induced superresolution magneto-optical recording medium includes an optical head that emits a laser beam to a signal recording plane of the medium and detecting a laser beam reflected therefrom. The optical head includes a polarization plane rotary unit and a polarizing filter between a light source and an objective lens. The polarization plane rotary unit transmits the laser beam while rotating the direction of polarization of the laser beam. The polarizing filter allows the laser beam to be transmitted at the outer portion independent of the direction of polarization, and allows only the laser beam that is polarized in a particular direction to be transmitted at the inner portion. The polarization plane rotary unit is controlled so as to rotate the direction of polarization of the laser beam in a direction different from the particular direction in reproduction.

Abstract: The magneto-optical recording medium, including a transparent polycarbonate substrate, an interference layer made of SiN, a reading layer made of GdFeCo, a recording layer made of TbFeCo, an oxidation-preventing layer made of SiN, a irradiation layer made of Al and an ultraviolet-setting plastic layer, is disclosed. Each layer is deposited to a suitable thickness in the above-named order on the transparent polycarbonate substrate. The composition of each element in the reading layer and the recording layer is set to a suitable value to achieve acceptable characteristics. A high recording and reading density is achieved.

Abstract: A surface acoustic wave (SAW) device includes a plurality of SAW filters connected in cascade. An impedance matching element in the form of a SAW resonator is interposed between two adjoining SAW filters. Each filter includes a first piezoelectric substrate having a first electromechanical coupling factor and the resonator includes a second piezoelectric substrate having a second electromechanical coupling factor. The second electromechanical coupling factor is greater than the first factor so that the inductive band of the SAW resonator is wider than the pass band of the SAW filter. The device affords improved filter properties including an increased fractional bandwidth and an increased out-of-band attenuation.

Abstract: To provide a composition containing a mint flavor with an improved taste, polygodial or a polygodial-containing plant extract is added thereto. Enhancement of the coolness, suppression of the bitter/offensive taste and an improvement of the long-lasting properties are imparted to the taste of the mint flavor, thus enabling the effective application of the mint flavor to foods, drinks, cosmetics, toothpastes, drugs, etc.

Abstract: An electronic elemental A1 has a lead electrode at the edge and a supporting member A2, positioned so that it faces the electronic element across a gap G. The supporting member A2 also has an external connecting terminal A5 at a location opposite the lead electrode A4. A resin layer A3 is positioned between electronic element A1 and supporting member A2, indented by the distance d from the edge of the electronic element A1. The resin layer bonds the electronic element (A1) and supporting member A2. The relationship of the distance d with G should satisfy this expression; d>G. A solder A6 fills the space created by the gap G between the lead electrode A4 and the external connecting terminal A5 over the distance d which is the distance from the edge of the electronic component A1, to the resin layer A3. The solder connects the lead electrode A4 and the external connecting terminal A5.

Abstract: There is disclosed a flavor and test composition for a chewing gum which has an effect of extending release of a flavor and taste of the chewing gum and is constructed by coating or melting and dispersing a flavor and taste substance which is an essence of expressing the flavor and taste, wherein a material used for the coating or the melting and dispersing of the flavor and taste substance is composed of a substance group comprising sterols as main ingredients. There is also disclosed a chewing gum which contains the above mentioned flavor and taste composition for a chewing gum.

Abstract: A simplified apparatus for measurement of receipt light quantity of ultraviolet radiation wherein a colored material is carried on a solid support which material discolors or fades in accordance with the receipt of light quantity due to light receipt of ultraviolet radiation having wavelength in the range of at least 300 to 360 nm, and a method for measurement of ultraviolet radiation having wavelength in the range of at least 300 to 360 nm in sunlight which comprises exposing the above measurement apparatus to sunlight and monitoring discoloration or fading of the colored material of the measurement apparatus to detect receipt light quantity of ultraviolet radiation of the wavelengths.

Abstract: A method of yarn piecing in a fasciated yarn spinning unit is disclosed by which a yarn having a broken end and drawn out from the yarn package is introduced through the false-twisting nozzle by conducting an intermediate portion of the yarn into a slit which is formed on a lateral side of the nozzle and extends to the yarn passage channel in the nozzle. Because the yarn has been previously cut into a predetermined length thereof, the cut end of the yarn is placed in the drafting zone of the drafting mechanism at a position where the cut yarn end overlaps a broken end of the fiber bundle. By restarting the spinning operation, the overlapping ends of the yarn and fiber bundle are drafted properly in the drafting zone and then the fibers in the overlapping ends are intermingled by the false-twisting effect of the rotary stream of jetted air while they are advanced through the false-twisting nozzle.

Abstract: A bundle of optical fibers is disclosed in which optical fibers each provided with a cladding layer are stacked tier upon tier in a close-packed hexagonal structure and the ratio of a radius of the core of each optical fiber to a radius of the optical fiber including the cladding layer ranges from 0.55 to 0.65.

Abstract: A drafting device for a spinning machine, in which a plurality of loading devices for top rollers is provided, by which each top roller is held in a weighting arm in such a state as being displaceable independently from the other roller without disturbing the drafting operation of the other rollers. By this, a yarn piecing operation in a fasciated yarn spinning system can easily be carried out.

Abstract: A novel method for yarn piecing in a fasciated yarn spinning unit, in which a broken end of a yarn and the fiber bundle to be pieced together are nipped and intermingled with each other between a soft nipping area between middle top and bottom aprons and thereafter are false-twisted by a vortex in an air nozzle. Motions of the associated parts are controlled as so to be able to achieve a suitable overlapping length of the yarn and the fiber bundle in the nipping area of the aprons.