摘要:
An amount of a semiconductor substrate cut due to etching in the bottom of a contact hole formed by the SAC technique is reduced. Silicon oxide films are dry etched under the conditions of increasing the etching selective ratio of the silicon oxide films to an insulating film. Then, the conditions are changed to those increasing the etching selective ratio of the insulating film to the silicon oxide films and the insulating film is etched by a predetermined amount.
摘要:
An internal gear oil pump made of Al alloys having less mutual damage property and superior wear resistance is provided. The internal gear oil pump has a casing with a gear compartment, a drive gear, and a driven gear, all of which are the structural members of the internal gear oil pump. The casing is constituted of an Al-alloy casting. The drive gear and the driven gear are constituted of a hot plastic working material of Al—Si alloy powder. The hot plastic working material is constituted of an Al—Si alloy having a structure in which unit crystal phases are dispersed in a base matrix by 10 to 40 area percent. by the structural observation with an optical microscope, the unit. crystal phases being harder than the base matrix. The base matrix is constituted of an Al—Si alloy which contains, on weight basis, 10% to 18% Si, 4% to 8% Fe, 1% to 3% Ni, 1% to 3% Cr, and the balance being Al and incidental impurities. The alloy has a structure in which ultrafine grains of intermetallic compounds and Si are dispersed in the matrix. The unit crystal phases are constituted of an Al—Si alloy which contains, on weight basis, 25% to 40% Si, 1% to 3% Fe, 2% to 6% Ni, 0.3% to 2% Cr, and the balance being Al and incidental impurities. The alloy has a structure in which ultrafine grains of intermetallic compounds and Si, and primary Si crystal grains are dispersed in the matrix of the unit crystal phases.
摘要:
An inverted hybrid type thin film magnetic head including a substrate, an inductive recording element provided on the substrate and a magnetoresistive reading element provided on the inductive recording element. The inductive recording element having a first magnetic film provided on an inner surface of a recessed portion formed in the surface of the substrate and on the surface of the substrate to constitute a pole portion, a thin film coil formed within the recessed portion, a gap film formed on the pole portion of the first magnetic film and on an insulating film which supports and isolates coil turns, and a second magnetic film applied on the gap film and having a pole portion which is opposed to the pole portion of the first magnetic film via the gap film. The magnetoresistive reading element includes a magnetoresistive film formed within a shield gap film provided on the second magnetic film and a third magnetic film formed on the shield gap film. The pole portion of the second magnetic film is preferably formed by a protrusion projecting into a groove. A bonding pad electrically connected to one end of the thin film coil is provided on a side wall of a slider such that a center of the bonding pad situates within a pattern of the coil. Remaining bonding pads connected to the other end of the coil as well as to both ends of the magnetoresistive film are also provided on the side wall of the slider.
摘要:
In the thin film magnetic transducer element, the front end portions of the upper pole piece and the lower pole piece are partially removed in such a manner that they align non parallel to the gap film on the opposite sides of the gap film. The condition .DELTA.P1>.DELTA.P2 is satisfied when the difference between the maximum pole length P1max and the minimum pole length P1min of the lower pole piece is .DELTA.P1 and the difference between the maximum pole length P2max and the minimum pole length P2min of the upper pole piece is .DELTA.P2. The sub pulse is reduced and so the partial response method can be employed.
摘要:
In the thin film magnetic transducer element, the front end portions of the upper pole piece and the lower pole piece are partially removed in such a manner that they align non parallel to the gap film on he opposite sides of the gap film. The condition .DELTA.P1>.DELTA.P2 is satisfied when the difference between the maximum pole length P1max and the minimum pole length P1min of the lower pole piece is .DELTA.P1 and the difference between the maximum pole length P2max and the minimum pole length P2min of the upper pole piece is .DELTA.P2. The sub pulse is reduced and so the partial response method can be employed.
摘要:
An asynchronous transfer mode type multimedia radiocommunication system including a transmitter and a receiver connected to the transmitter via an asynchronous transfer mode network and wherein accesses to two channel data which communicate by radio and have different levels of communication quality, are performed by the asynchronous transfer mode network. A separator of a transmitter separates input data into L-bit main channel data and one-bit sub channel data. A convolutional coder convolutionally codes the data. Further, a mapper maps the resultant binary information onto crossed I and Q channel axes according to the data by switching for each L bit of the main channel data, thereby enabling transmission of additive information corresponding to data of 1/L the transfer rate. Thereafter, a viterbi decoder of a receiver decodes the information. Further, a sub channel having arbitrary communication quality can be provided by arbitrarily selecting the value (L.sub.min .ltoreq.L) of an L bit.
摘要:
A differential circuit configuration for generating an inverted signal and a non-inverted signal of an original signal is presented. The waveforms of the output signals are highly synchronous and precise owing to the circuit design which provides matched gate-to-source voltage vs drain-to-source current to produce output trace matching in the output voltage traces of a pair of pull-up transistors with a pair of pull-down transistors. The circuit configuration does not require adjustable capacitors or driving circuits, and is therefore suitable for use in advanced compact devices.
摘要:
A semiconductor memory device includes a memory cell array with each cell being connected to respective pairs of complementary bit lines, and a write circuit for writing data to the memory cells by applying complementary write signals to the complementary bit lines. The write circuit includes complementary data lines, a buffer circuit for applying complementary data signals to the data lines in response to the input data, and sense amplifier connected to the data lines and the bit lines for amplifying the data lines differential signals and for producing the complementary write signals.
摘要:
A micro computer 6 reads a manual switch signal Sm from an operating section 15, and sets a target output W0 of an electrically driven compressor 11 based on the manual switch signal Sm. A temperature sensor 20 detects a temperature Ts of a designated component in the compressor control system. Micro computer 6 judges whether the detected temperature Ts is larger than a predetermined upper limit Ta, and generates an output command W equalized to the target output W0 when the temperature Ts is within a predetermined allowable range. On the other hand, when the detected temperature Ts is higher than the upper limit Ta, micro computer 6 sets a modified output W1 smaller than target output W0 by a predetermined correction value .DELTA.W (W1=W0-.DELTA.W>0), and adjusts the output command W to the modified output W1. Then, the compressor 11 is actuated based on thus obtained output command W.
摘要:
In an inverter apparatus for air conditioner for converting DC voltage supplied from a DC power source into pseudo AC voltage of variable voltage and variable frequency by means of pulse-width modulation, a control circuit varies pulse-widths of the pseudo AC voltage in response to degree of rise/drop of the DC voltage from the nominal DC voltage; and when the voltage has an insufficient value to obtain the frequency-voltage characteristic, the control circuit controls switching devices to issue a maximum AC voltage obtained by the present DC voltage independent of frequency.