摘要:
An optical disk having a dual layer layout includes two recording layers each having a data area for recording information. An optical information recording apparatus handles the two data areas of the two recording layers of the optical disk as a single continuous data area and divides the continuous data area into plural divided areas such as sessions and fragments. The optical information recording apparatus then records data on each of the sessions or fragments corresponding to the divided areas.
摘要:
A recording apparatus includes a first power supply having a first output voltage, a second power supply having a second output voltage different from the first output voltage, and a recording circuit for recording input digital data on a recording medium selectively using the first power supply or the second power supply. The recording circuit selectively uses the first power supply or the second power supply in accordance with a state of the input digital data. It is thereby possible to reduce power consumption in the circuitry of the apparatus during recording.
摘要:
The present invention is applicable to an apparatus which is arranged to reproduce a signal from a recording medium by using a plurality of heads each having a different azimuth angle and which includes a PLL circuit formed by an oscillator, a phase-difference detector for detecting a phase difference between an output clock signal of the oscillator and the reproduced signal, and a loop filter for receiving an output of the phase-difference detector. The present invention generates a clock signal phase-synchronized with the reproduced signal, by detecting an oscillation frequency error of the oscillator relative to a target frequency, integrating the oscillation frequency error together with an output of the loop filter to provide an integral output, adding the integral output to the output of the loop filter and inputting an addition result to the oscillator, and varying an operation for detecting the oscillation frequency error, according to the azimuth angle of each of the plurality of heads.
摘要:
A flat multifilament yarn having a very soft unique touch is obtained by arranging two or more types of multifilament yarns having different drawings properties in parallel, and applying a false twisting procedure which includes a twist applying and twist releasing operations to the paralleled multifilament yarn at a temperature of 120.degree. C. or less, and subjecting the resultant false twisted composite yarn to a heat treatment at a temperature of 130.degree. C. or more in a subsequent procedure, the resultant high elongation multifilaments derived from the high drawability multifilaments in the multifilament yarn having a crystallinity (density method) of 10% to 30%, a non-crystalline portion orientation of 0.035 to 0.10, a non-crystalline portion density of 1.31 to 1.36 g/cm.sup.3, and a Young's modulus of 200 to 700 kg/mm.sup.2.
摘要:
A process for manufacturing a bulky flat yarn comprising: preparing at least two kinds of thermoplastic synthetic undrawn yarns having different natural draw ratios, respectively; simultaneously drawing said prepared yarns at a draw ratio which is equal to or larger than the smallest natural draw ratio of the yarns and which is equal to or smaller than the largest natural draw ratio; and releasing drawing tension in the yarns after they are drawn. The yarns are mixed by means of an interlacing air nozzle before or after they are drawn.
摘要:
A deep-dyeable polyester fiber of soft hand comprising recurring units consisting mainly of ethylene terephthalate and --SO.sub.3 M groups in which M is an alkali metal, and having a degree of crystallinity .chi..sub..rho. of from 30 to 55%, a degree of orientation .DELTA.n of from 0.06 to 0.12 and .chi..sub..rho. /.DELTA.n of from 350 to 550. The fiber can be produced by heat treating a melt spun, slightly oriented filament under relaxation and then drawing the heat treated filament at a low temperature.
摘要:
Disclosed is a textured composite yarn composed of a first multifilament yarn having a lower extensibility and a second multifilament yarn having a higher extensibility, as well as a process for manufacturing such textured composite yarn. The first multifilament yarn forms a core yarn, while the second multifilament yarn is wrapped at least partially around the core yarn. Some individual filaments of the second multifilament yarn are entangled and interlaced with some filaments of the first multifilament yarn in the boundary region between the core yarn and the wrapping yarn.
摘要:
A method for converting a multifilament bundle of a synthetic material into a sliver and an apparatus for effecting the method. The apparatus comprises: a feed roller device for feeding the bundle; a draft roller device consisting of a pair of draft rollers, the peripheral speed of which draft roller device is higher than that of the feed roller device, for stretch breaking the filaments in the bundle between the feed roller device and the draft roller device; and an apron belt, belted between one roller of the draft roller device and the intermediate portion of the feed roller device and the draft roller device, which is wound around the other draft roller. The broken filaments are smoothed between the apron belt and the other draft roller so that the evenness of the sliver thickness is improved and the uniformity in quality of the spun yarn obtained from the sliver is also improved. Accordingly, the method and apparatus has advantages when a multifilament bundle of a synthetic material is converted into a sliver at a high speed of not less than 200 m/min.
摘要:
A disk-shaped rewritable information recording medium having at a first recording layer and a second recording layer is disclosed. The information recording medium includes a first data area situated in the first recording layer, the first data area having a plurality of addresses allocated thereto, the plural addresses continuously increasing in a first direction, a second data area situated in the second recording layer, the second data area having a plurality of addresses allocated thereto, the plural addresses continuously increasing in a second direction opposite to the first direction, and a management information area having an area for recording end recorded area information thereto, the end recorded area information including information for identifying an area in the second data area having data that corresponds to an end position of the second data area.
摘要:
An information recording apparatus and method can prevent an information recording medium having a plurality of recording layers from being incompatible with a reproduction-only information recording medium due to an unrecorded area, which is produced by completion of recording in a middle of a data area of the recording layer. The recording layers include at least a first recording layer and a second recording layer, the first recording layer providing a reference with respect to a position of said data area in each of the recording layers. The user data is recorded in response to a recording request. After recording the user data, predetermined data is recorded in a predetermined unrecorded area in the second recording layer.