Abstract: A switching power supply circuit display an oscillation frequency will not be lowered with a light load. After the first output transistor 11 turns from conduction to cut-off, when the second output transistor 12 conducts, first, by means of the energy accumulated in the inductance element 13, a current will flow from the source terminal toward the drain terminal of the second output transistor 12, and then by means of the discharge of the output capacitor 14, a current will flow from the drain terminal toward the source terminal. Next, in case of a light load, the second output transistor 12, before being cut off by the control circuit 20, is cut off by the frequency control unit 50. By means of the discharge of the output capacitor 14, the lowering of oscillation frequency in case of a light load is prevented.

Abstract: The objective of this invention pertains to a drive signal supply circuit for a switching regulator. Switching regulator 1 of the present invention has amplitude center adjusting circuit 20. In switching regulator 1, a sawtooth wave and the output signal of error amplifier 11 are input to comparator 12, and a pulse signal that sets the ON/OFF state of switching transistor 2 is generated. Since the amplitude center voltage of the sawtooth wave is adjusted corresponding to the power source voltage Vcc, even when power source voltage Vcc is changed rapidly, the amplitude center adjusting circuit 20 can adjust the amplitude center voltage of the sawtooth wave at a high speed matching the rapid fluctuations, and this signal is output to comparator 12. Consequently, the pulse signal output from comparator 12 can follow the rapid fluctuations of power source voltage Vcc. As a result, the output voltage can follow the rapid fluctuations of the power source voltage.

Abstract: The objective of this invention pertains to a drive signal supply circuit for a switching regulator. Switching regulator 1 of the present invention has amplitude center adjusting circuit 20. In switching regulator 1, a sawtooth wave and the output signal of error amplifier 11 are input to comparator 12, and a pulse signal that sets the ON/OFF state of switching transistor 2 is generated. Since the amplitude center voltage of the sawtooth wave is adjusted corresponding to the power source voltage Vcc, even when power source voltage Vcc is changed rapidly, the amplitude center adjusting circuit 20 can adjust the amplitude center voltage of the sawtooth wave at a high speed matching the rapid fluctuations, and this signal is output to comparator 12. Consequently, the pulse signal output from comparator 12 can follow the rapid fluctuations of power source voltage Vcc. As a result, the output voltage can follow the rapid fluctuations of the power source voltage.

Abstract: This invention provides a magnetic recording medium which, even when the friction time is prolonged or the scan speed is increased to achieve a long time recording, will leave no burnt matters onto a magnetic head, reduce spacing loss, and prevent an increase in error rate. This invention also provides a cleaning tape which, without causing any wear and damage of a magnetic head, will remove the head of burnt matters adherent thereto.They are actually a magnetic recording medium and cleaning tape which hold an antiseize agent containing a compound with a pyridine skeleton and two or more ligand sites. Alternatively, they are a magnetic recording medium and cleaning tape which hold an antiseize agent containing a diketone compound. The antiseize agent may contain a titanium coupling agent, carboxylic acid, and phosphor-containing compound, in addition to the above compound.

Abstract: A cleaning tape having a cleaning effect for a magnetic head and an excellent picture quality and enabling the head cleaning state to be comprehended more reliably. The cleaning tape 1 includes a non-magnetic substrate 2 on which a magnetic paint mainly composed of magnetic powders and a binder is coated to form a magnetic layer 3. The Young's modulus in the longitudinal direction is 6000 to 10000 N/mm.sup.2, the residual magnetic flux density (Br) of the uppermost layer of the magnetic layer is not lower than 200 mT, the coercivity of the uppermost layer of the magnetic layer 3 is not lower than 127 kA/m and the centerline mean roughness of the surface of the magnetic layer (Ra) is 8 to 16 nm. The magnetic powders of the cleaning tape 1 are Fe--Co based alloy powders having a mean long-axis length of 0.06 to 0.20 .mu.

Abstract: A network management device for managing a plurality of network elements has a network element management data acquisition unit for acquiring, in stages, various management data possessed by the network elements when a session with a network element is resumed and when the network management device itself is started up, a rule management table for storing a dependence relationship between an operation and management data necessary to execute the operation, a feasible operation decision processing unit which, when an operation has been specified, refers to the dependence relationship to determine whether management data necessary to execute the operation has been acquired. If the necessary management data has been acquired, a network management execution unit executes network management conforming to the operation.

Abstract: A driving circuit with low power consumption and high operational speed, and including transistors Q.sub.1, Q.sub.2, Q.sub.3, Q.sub.4, P.sub.1 and P.sub.2, resistors R.sub.1 and R.sub.2, and diodes D.sub.1 and D.sub.2 which form a high-level feeding circuit for setting the output terminal level at the high level; and a constant-current source I.sub.BS, current mirror circuit MR.sub.12, transistors Q.sub.11, Q.sub.13 and Q.sub.14, resistor R.sub.11, and Schottky diode DS.sub.11 which form a low-level feeding circuit for setting the output terminal level at the low level. When the output terminal (T.sub.out) level is changed to the high level or low level, a large current flows into the base of transistor Q.sub.3 or Q.sub.13, and a rapid change takes place for the output terminal level. When the output terminal level reaches the prescribed voltage, the current flowing into the base of transistor Q.sub.3 or Q.sub.13 disappears.

Abstract: A magnetic recording medium comprising a substrate made of non-magnetic material, and a magnetic layer formed on the substrate, the magnetic layer being composed primarily of a ferromagnetic powder and a binder, wherein an amount of a sulfuric ion extracted when the magnetic recording medium is immersed in a pure water having a temperature of 30.degree. C. for one hour, is 100 .mu.g or less per one square meter of the magnetic recording medium.

Abstract: An input signal processing circuit which prevents saturation of the input transistor. It has an input npn transistor QN1, a transistor QP1, the emitters of which are connected to the cathode terminal T.sub.CTD, and the collectors of which are connected to the collector of the input transistor. Transistors QP2,QP3 have emitters connected to the cathode terminal T.sub.CTD, and bases connected to the bases of transistor QP1. Transistor QN2 has its emitter connected to anode terminal T.sub.AND via resistor R5 and its collector connected to a common connecting point with the bases of transistors QP1,2. Transistor QN3 has its emitter connected to the anode terminal T.sub.AND, its base connected to the base of transistor QN2, and its collector connected to base and the collector of transistor QP2. A resistor R4 is connected between the collector of input transistor QN1 and the collector of third transistor QN2.

Abstract: A magnetic recording medium having a magnetic layer formed by coating a non-magnetic support member with a magnetic coating material mainly composed of ferromagnetic iron alloy powder and a binding material, wherein the magnetic coating material includes ferromagnetic iron alloy powder containing Co by 6 to 30 atom %, Y by 1 to 6 atom % and Al by 10 to 15 atom % with respect to Fe and having an average major axis length of 0.06 .mu.m to 0.20 .mu.m, polyvalent carboxylic acid having a molecular weight of 300 or less or an anhydride of the polyvalent carboxylic acid, a binding material, and a lubricant, and the maxim diameter of pores in the magnetic layer is 10 nm to 30 nm.

Abstract: An overdrive circuit having a first current source which supplies an overdrive current and a second current source which supplies an ordinary current smaller than the overdrive current. A first circuit operates the first current source that supplies the overdrive current for a predetermined time period after the start of current supply. A second circuit stops the action of the first current source after the predetermined time period has passed and drives the second current source to supply the ordinary current as the driving current.

Abstract: A command file processing system includes a terminal which inputs a password and commands which are to be executed. A command table prestores command names in correspondence with information which indicates passwords authorized to execute the commands. A command made up of the commands are to be executed and are registered in the command file. A judging part judges whether or not the password input from the terminal has authority to execute an arbitrary command which is to be registered in the command file when registering the commands in the command file. The judging part controls the command file creating part to reject the registration of the arbitrary command in the command file when the password has no authority to execute the arbitrary command.

Abstract: A magnetic recording medium having minute irregularities on the surface of a magnetic layer is disclosed. The value of the ratio A.sub.V /A.sub.P, where A.sub.V and A.sub.P are cross-sectional areas of valleys and projections as measured in a plane lower by 50 nm and in a plane higher than 50 nm than an intermediate plane of the magnetic layer, respectively, with the measurement being made using a three-dimensional roughness meter, is given by A.sub.V /A.sub.P .gtoreq.0.90, wherein the intermediate plane is a plane for which the cross-sectional area of the projections is approximately equal to that of the valleys. The minute irregularities on the surface of the magnetic layer are produced by providing a non-magnetic substrate presenting different surface roughnesses on its front surface and back surface, and by transferring surface irregularities constituting the surface roughness of the back surface of the non-magnetic substrate to the front surface of the substrate.

Abstract: A magnetic recording medium improved in electromagnetic conversion characteristics and runnability is disclosed. The magnetic recording medium is formed by coating a non-magnetic substrate with a magnetic layer. The magnetic layer contains a fine ferromagnetic powder having a specific surface area larger than 45 m.sup.2 /g, a binder having polar groups such as --SO.sub.3 M and --OSO.sub.3 M in the molecule in an amount of 0.2 to 0.8 .mu.mol per m.sup.2 of the specific surface area of the ferromagnetic powder, and a compound having 2 or more carboxylic groups in an amount of 0.5 to 5.0 .mu.mol per m.sup.2 of the specific surrface of the ferromagnetic powder. The magnetic layer is further incorporated with a carbon powder having a mean diameter of 200 to 400 nm and a specific surface area of 5 to 20 m.sup.2 /g to improve the runnability of the magnetic recording medium while keeping the improved magnetic characteristics.

Abstract: A magnetic recording medium such as magnetic tape or magnetic disc is disclosed in which a magnetic layer if formed on the non-magnetic base material and in which the fatty acid ester with diglycerol is contained as the lubricant.The fatty acid ester with diglycerol employed as the lubricant is an ester of diglycerol with a saturated or unsaturated fatty acid with 8 to 22 carbon atoms.