Abstract: The present invention provides a sheet material container being made of a sheet material and including a body portion and a bottom portion that is to be disposed on a placement surface, and the sheet material including a plurality of film layers. A body portion sheet that constitutes the body portion includes a bonding portion where peripheral edge portions of the sheet materials are bonded. In a bottom surface sheet that constitutes the bottom portion, a non-adhesive region is provided in the plurality of film layers. The non-adhesive region forms a bottom filler-filled portion. The bottom filler-filled portion extends annularly around a non-filled portion, and includes at least three protruding leg portions that are to be placed on the placement surface so as to allow the container to stand by itself. The protruding leg portions protrude toward the placement surface past other portions in the bottom filler-filled portion due a leg forming portion.

Abstract: Disclosed is a PRML regenerating apparatus for regenerating a signal read by a head from a storage medium. This PRML regenerating apparatus has a waveform equalizing circuit for waveform-equalizing the read signal, a maximum-likelihood decoder for maximum-likelihood-decoding, after obtaining a determination value by comparing the equalized output with upper and lower slice levels, this determination value and a control circuit for setting variable a distance between the upper slice level and the lower slice level of the maximum-likelihood decoder. The distance between the upper and lower slice levels can be thereby set variable in accordance with an equalization characteristic. A ternary determination circuit of the maximum-likelihood decoder is constructed of a memory for storing a correspondence table of the equalized output and the upper or lower slice level versus the determination result and the next upper or lower slice level.

Abstract: Disclosed is a PRML regenerating apparatus for regenerating a signal read by a head from a storage medium. This PRML regenerating apparatus has a waveform equalizing circuit for waveform-equalizing the read signal, a maximum-likelihood decoder for maximum-likelihood-decoding, after obtaining a determination value by comparing the equalized output with upper and lower slice levels, this determination value and a control circuit for setting variable a distance between the upper slice level and the lower slice level of the maximum-likelihood decoder. The distance between the upper and lower slice levels can be thereby set variable in accordance with an equalization characteristic. A ternary determination circuit of the maximum-likelihood decoder is constructed of a memory for storing a correspondence table of the equalized output and the upper or lower slice level versus the determination result and the next upper or lower slice level.

Abstract: A magnetic disk module adapted to be inserted in a data storing device body which is in use. The module includes two sets of disk drive units and printed wiring boards in one housing so that are disk drive unit or printed wiring board can be easily attached or detached in one set while the other set is in an operating state. The module includes a first connector attached to the disk drive unit, a second connector attached to the printed wiring board, a third connector at the rear end of the housing for plug-in connection to a connector of a data storing device body, a fourth connector arranged in the housing for plug-in connection to the first connector, and a fifth connector arranged in the housing for plug-in connection to the second connector.

Abstract: An arrangement of a designation of a drive element number using mother boards interposed between an upper grade device and a plurality of drive elements includes a plurality of groups of drive elements, each of which drive elements has a specifically designated drive element number, an upper grade device for carrying out a signal communication through tag bus line cables with a selected drive element, and a plurality of mother boards interposed between the upper grade device and the plurality of drive elements, each of the mother boards corresponding to one of the plurality of groups of drive elements. The plurality of mother boards has a same potential level arrangement of connection pins for a drive element number designation in connecting portions.

Abstract: A delay circuit which compensates for a variable phase output of an index signal by delaying the read out index signal. The delay time of the delay circuit depends on the cylinder on which a read/write head is located, and is chosen so that the delayed index signals are generated at an essentially constant phase angle with respect to a reference angular position. The delay circuit may include a counter which is pre-loaded with an address of the cylinder on which the head is located, and which counts number of clock pulses input to the counter. Overflowing of the counter generates the compensated index signal. Thus, synchronous operation of plural disk apparatus is accomplished, when the head seeks a new cylinder.

Abstract: A magnetic disk storage apparatus in which a plurality of magnetic head positioners are independently driven with respect to each other. A housing having a sensor secured thereto indirectly senses mechanical vibration of a magnetic disk and issues a sense signal. The mechanical vibration is inevitably caused by a seek operation of a selected magnetic head positioner. Based on the sense signal, a compensating signal is generated in a mechanical vibration follow-up system disposed in the apparatus. The compensating signal is input to a coil of a driving motor of non-selected magnetic head positioners such that the effect of the mechanical vibration on the other positioners is cancelled. Thus, magnetic heads supported by the other positioners do not become off-track.

Abstract: A system for driving a constant current drive type DC motor a which enables the supply of a low power to switching elements in a constant current drive circuit therein during, and in particular, at start-up of the motor. The DC motor drive system includes a DC motor, a unit for detecting a rotation of a rotor of the motor, a power supply unit for supplying a drive power to the motor, and a current drive circuit providing a constant current passing through a coil of the motor supplied with the drive power during a normal operation of the motor. The power supply unit sequentially increases a voltage therefrom in multi-steps in response to the increase of the rotation during a start-up operation. The power supply unit may change the voltage supplied therefrom so that a maximum value of the current is sequentially increased during the start-up.