Abstract: When an input signal level is small, the electrical length of a phase line 21 and the electrical length of a phase line 23 are set in such a manner that the impedance seen by looking into the output side from an impedance reference point 11 at the output side of a carrier amplifier 3 becomes 2R+? (where R is a load resistance and ? is positive), and the electrical length of a phase line 22 is set at a difference between the electrical length of the phase line 21 and the electrical length of the phase line 23.

Abstract: When an input signal level is small, the electrical length of a phase line 21 and the electrical length of a phase line 23 are set in such a manner that the impedance seen by looking into the output side from an impedance reference point 11 at the output side of a carrier amplifier 3 becomes 2R+? (where R is a load resistance and ? is positive), and the electrical length of a phase line 22 is set at a difference between the electrical length of the phase line 21 and the electrical length of the phase line 23.

Abstract: A linearizer changes a gain characteristic to a valley characteristic in which a gain reduces and then increases. The linearizer includes: a signal path in which an RF signal input terminal an input side bias blocking capacitor, a diode pair, including diodes having opposite polarities to each other, an output side bias blocking capacitor and an RF signal output terminal in series in the stated order; a bias circuit in which a resistor is provided between and a signal path formed between the input side bias blocking capacitor and the diode pair and a bias terminal; an RF short-circuiting capacitor whose one end is connected with the bias circuit between the bias terminal and the resistor and whose other end is grounded; and a DC feed inductor whose one end is connected with the signal path between the diode pair and the output side bias blocking capacitor and whose other end is grounded.

Abstract: A linearizer changes a gain characteristic to a valley characteristic in which a gain reduces and then increases. The linearizer includes: a signal path in which an RF signal input terminal (1), an input side bias blocking capacitor (4), a diode pair (8, 12) including diodes having opposite polarities to each other, an output side bias blocking capacitor (5), and an RF signal output terminal (2) in series in the stated order; a bias circuit in which a resistor is provided between and a signal path formed between the input side bias blocking capacitor (4) and the diode pair (8, 12) and a bias terminal (3); an RF short-circuiting capacitor (6) whose one end is connected with the bias circuit between the bias terminal (3) and the resistor (7) and whose other end is grounded; and a DC feed inductor (11) whose one end is connected with the signal path between the diode pair (8, 12) and the output side bias blocking capacitor (5) and whose other end is grounded.

Abstract: A method of producing a protective film on recording media including forming a protective film on at least the surface facing a recording medium, said protective film having the composition represented by the formula: SiCXHYOZNW, where X=3-26, Y=0.5-13, Z=0.5-6 and W=0-6, in terms of atomic ratio, having a film thickness of 1-3 nm and having a refractive index of 2.0 or more.

Abstract: A protective thin-film for a magnetic head is produced by a method comprising vapor-depositing from an atmosphere containing Si, C and H under an operating pressure of less than 0.05 Torr while applying a negative bias voltage of less than ?400 V but greater than ?1000 V to a magnetic head, a protective thin film on at least the surface of the head facing a recording medium, the protective film containing Si, C and H in amounts of 3-9 at %, 61-81 at % and 16-30 at %, respectively, having a thickness of 1-3 nm and having a refractive index of 2.0 or more.

Abstract: A metal magnetic powder for a magnetic recording medium is provided whose particles have a metal magnetic phase, composed mainly of Fe or Fe plus Co, and an oxide layer, wherein the average major axis length of the powder particles is 10-50 nm, the average particle volume including the oxide layer is 5,000 nm3 or less, the atomic ratio (R+Al+Si)/(Fe+Co) calculated using the content values (at. %) of the elements contained in the powder particles is 20% or less, where R is rare earth element (Y being treated as a rare earth element). The metal magnetic powder is obtained by using a complexing agent and a reducing agent to elute nonmagnetic constituents after firing. The metal magnetic powder exhibits a large saturation magnetization ?s for its particle volume while maintaining weatherability comparable to the conventional level and is suitable for a coated-type magnetic recording medium.

Abstract: A high efficiency amplifier has an analog predistortion circuit (5) connected between an input side dividing circuit (2) and a quarter-wave line (6). This offers an advantage of being able to improve the linearity of the entire amplifier because the nonlinear distortion of a peak amplifier (7) is compensated.

Abstract: A method of producing a wear-resistant protective film for a thermal head comprises depositing a wear-resistant protective film by sputtering on a thermal head which includes a substrate, and a heat-developing layer and a pair of electrodes formed on either the substrate or a heat-regenerative layer formed thereon. A layer of the wear resistant protective film is formed under a RF larger bias and another layer without a bias or with a smaller bias. Good step coverage is obtained by the RF sputter layer of the wear-resistant and the protective film prevents the intrusion of water that can cause cracking, and the layer formed under no or smaller bias reduces internal stresses and inhibits the development of cracks due to internal stresses as well as the cracking by RF sputtering.

Abstract: A magnetoresistive thin-film magnetic head with high corrosion resistance for recording medium having massive capacity is provided by providing a protective film having a thickness of 40 ? or less. Since the distance between the head and the medium is remarkably reduced, the film is suitable for a recording medium having high-packing density. The magnetoresistive type thin-film magnetic head is provided, wherein the following layers are formed on at least the surface of the head facing a recording medium: (A) a lower layer composed of a thin film having the composition represented by the formula selected from the group consisting of: formula (i): SiCXHYOZNWFTBUPV (where X=0.5–26, Y=0.5–13, Z=0–6, W=0–6, T=0–6, U=0–1 and V=0–1, in terms of atomic ratio), and formula (ii): SiHYOZNWFTBUPV (where Y=0.0001–0.7, Z=0–6, W=0–6, T=0–6, U=0–1 and V=0–1); and (B) an upper layer composed of a diamond-like thin film having the composition represented by the following formula: CHaObNcFdBePf (where a=0–0.

Abstract: A thin-film head is provided wherein a protective film is formed on at least the surface facing a recording medium, said protective film having the composition represented by the formula (I): SiCXHYOZNW [where X=3-26, Y=0.5-13, Z=0.5-6 and W=0-6, in terms of atomic ratio], having a film thickness of 1-3 nm and having a refractive index of 2.0 or more; and the method for producing the film by applying a negative bias voltage is provided. The resultant film has excellent coherence to the components of the thin-film head, rendering excellent durability to the head.

Abstract: A thin-film head is provided wherein a protective film is formed on at least the surface facing a recording medium, said protective film containing Si, C and H in amounts of 3-9 at %, 61-81 at % and 16-30 at %, respectively, having a film thickness of 1-3 nm and having a refractive index of 2.0 or more. The resultant film has excellent coherence to the components of the thin-film head, rendering excellent durability to the head. Also, a method is provided for producing the thin-film head in which a thinner film can be obtained with less production steps and lower costs.

Abstract: A divider 3 for dividing and distributing a high-frequency signal input from an input terminal 1 to two output sides, a main amplifying unit 4, connected to one output side of the divider 3, for amplifying one high-frequency signal output from the divider 3, a subsidiary amplifying unit 5, connected to the other output side of the divider 3, for performing no operation in case of a low instantaneous electric power of the other high-frequency signal output from the divider 3 and amplifying the other high-frequency signal in case of a high instantaneous electric power of the other high-frequency signal and a circulator 6 for injecting the high-frequency signal amplified in the subsidiary amplifying unit 5 into the output side of the main amplifying unit 4 and injecting the high-frequency signal amplified in the main amplifying unit 4 into an output terminal 2 are arranged.

Abstract: A fluid dynamic bearing has a shaft (11) fitted in a sleeve (12) for rotation, with a fluid filled therebetween. The shaft (11) and/or sleeve (12) is formed with a pattern consisting of grooves (111g) and lands for generating a pressure distribution in the fluid and then covered with a diamond-like carbon film (11c) over the surface of the grooves and the surface of the lands.

Abstract: An, magnetoresistive thin-film magnetic head with high corrosion resistance for recording medium having massive capacity is provided by providing a protective film having a thickness of 40 Å or less. Since the distance between the head and the medium is remarkably reduced, the film is suitable for a recording medium having high-packing density. The magnetoresistive type thin-film magnetic head is provided, wherein a protective film made of a diamond-like thin film having the composition represented by the following formula: CHaObNcFdBePf (where a=0-0.7, b=0-1, c=0-1, d=0-1, e=0-1 and f=0-1, in terms of atomic ratio), and having a thickness of 40 Å or less, is formed on at least the surface of the head contacting a recording medium. Also provided are a method for producing the same, and a magnetic head device using the same.

Abstract: A magnetoresistive thin-film magnetic head with high corrosion resistance for recording medium having massive capacity is provided by providing a protective film having a thickness of 40 Å or less. Since the distance between the head and the medium is remarkably reduced, the film is suitable for a recording medium having high-packing density.

Abstract: A feedforward amplifier combines an input signal combined by a first error rejection loop with an error component and a first pilot signal detected by a second error detection loop, thereby canceling out the error component and the first pilot signal residual in the input signal.

Abstract: A method of producing a wear-resistant protective film for a thermal head comprises depositing a wear-resistant protective film by sputtering on a thermal head which includes a substrate, and a heat-developing layer and a pair of electrodes formed on either the substrate or a heat-regenerative layer formed thereon. A layer of the wear resistant protective film is formed under a RF larger bias and another layer without a bias or with a smaller bias. Good step coverage is obtained by the RF sputter layer of the wear-resistant and the protective film prevents the intrusion of water that can cause cracking, and the layer formed under no or smaller bias reduces internal stresses and inhibits the development of cracks due to internal stresses as well as the cracking by RF sputtering.

Abstract: A divider 3 for dividing and distributing a high-frequency signal input from an input terminal 1 to two output sides, a main amplifying unit 4, connected to one output side of the divider 3, for amplifying one high-frequency signal output from the divider 3, a subsidiary amplifying unit 5, connected to the other output side of the divider 3, for performing no operation in case of a low instantaneous electric power of the other high-frequency signal output from the divider 3 and amplifying the other high-frequency signal in case of a high instantaneous electric power of the other high-frequency signal and a circulator 6 for injecting the high-frequency signal amplified in the subsidiary amplifying unit 5 into the output side of the main amplifying unit 4 and injecting the high-frequency signal amplified in the main amplifying unit 4 into an output terminal 2 are arranged.

Abstract: A method of producing a wear-resistant protective film for a thermal head comprises depositing a wear-resistant protective film by sputtering on a thermal head which includes a substrate, and a heat-developing layer and a pair of electrodes formed on either the substrate or a heat-regenerative layer formed thereon. A layer of the wear resistant protective film is formed under a RF larger bias and another layer without a bias or with a smaller bias. Good step coverage is obtained by the RF sputter layer of the wear-resistant and the protective film prevents the intrusion of water that can cause cracking, and the layer formed under no or smaller bias reduces internal stresses and inhibits the development of cracks due to internal stresses as well as the cracking by RF sputtering.