Abstract: A VIPA plate having a configuration where a translucent reflection film and a total reflection film are respectively arranged on one side and the other side of a transparent parallel plate can be used as a wavelength dispersion compensator by using a special mirror and a lens. However, the transparency characteristic of the wavelength dispersion compensator using such a VIPA plate is a periodical characteristic which is asymmetric with a central wavelength in a wavelength regime. Accordingly, not parallel light but converged or diverged light having angular dispersion is input to an etalon plate, so that a filter whose transparency characteristic is an asymmetric periodical characteristic which is reverse to the VIPA plate is configured for the central wavelength in the wavelength regime. With this filter, the transparency characteristic of the wavelength dispersion compensator using the VIPA plate is optimized.

Abstract: A rolling bearing intended for longer life by improving seizure resistance and wear resistance in the circumstance with slip contact or in the circumstance where lubricant tends to be exhausted, which is manufactured by applying carburization or carbonitridation to an Si-added material to disperse and precipitate carbides or carbonitrides containing Si or Si—X (X=one or more of Mn, Mo, and Cr) thereby improving the seizure resistance and the wear resistance by the self-lubrication effect thereof, the size of the carbides or carbonitrides being preferably 10 &mgr;m or less for preventing flaking, and the area ratio for the carbides or carbonitrides being preferably 1.0-30% for obtaining sufficient self-lubrication effect.

Abstract: An object of the invention is to provide a small and low-cost variable polarization plane rotator that can control a rotation angle of the polarization plane easily, and an optical device using the same.

Abstract: A movable mirror having a mirror surface reflecting a light input from an input fiber collimator is moved in an arrow (1) direction so that the reflection frequency of the input light reflected by an optical filter can be variable. The light is reflected plural times between the mirror surface and the optical filter, directed to a fixed mirror by the mirror surface, reflected by the fixed mirror, and is connected to an output fiber collimator. By moving the movable mirror in parallel, the reflection count of the light between the optical filter and the mirror surface is variable. Therefore, the wavelength characteristic of the light is obtained as an accumulated wavelength characteristic depending on the reflection count.

Abstract: At least any one of a bearing member (inner race, outer race and rolling element) is formed with a steel material containing 0.2 to 1.2 wt % of C, 0.7 to 1.5 wt % of Si, 0.5 to 1.5 wt % of Mo, 0.5 to 2.0 wt % of Cr, and 12 ppm or less of O. The bearing member is treated with carbonitriding, and thereafter, quenching and tempering so as to provide carbon concentration in the steel surface being 0.8 to 1.3 wt % and nitrogen concentration on the same being 0.2 to 0.8 wt %.

Abstract: Rays of light having respective wavelengths angular-dispersed and output from a VIPA plate are collected by a lens, and diffracted by a grating pair which is an optical path shift generation unit and optical path shift amount variation unit, and have a shift in a path of rays having different wavelengths. When the rays are reflected by a dispersion leveling three-dimensional mirror and input into the VIPA plate again, they are received by portions having different dispersion compensation amount of the three-dimensional mirror, thereby realizing different amounts of wavelength dispersion for respective wavelengths, and independently adjusting an amount of wavelength dispersion of the entire wavelengths of the WDM rays and the wavelength dispersion slope.

Abstract: A substrate 2 is autorotatably installed in a vacuum chamber 1 at an upper part thereof. MgF2 granules 3 as a film source material are put in a quartz boat 4 and mounted on a magnetron cathode 5. The magnetron cathode 5 is connected through a matching box 6 to a 13.56 MHz radio frequency power source 7. Cooling water 8 for holding the temperature of the magnetron cathode 5 constant flows on a lower face of the magnetron cathode 5. A side face of the vacuum chamber 1 is provided with gas introduction ports 9, 10 for introducing gas in the vacuum chamber 1. A shutter 11 is placed between the magetron cathode 5 and the substrate 2. This structure provides a process enabling forming a thin film at a high speed by sputtering, especially, a high speed sputtering enabling forming a thin fluoride film free of light absorption.

Abstract: A toroidal type continuously variable transmission, includes: at least one pair of disks concentrically disposed on each other and rotatably supported independent from each other; a trunnion swingable about a pivot shaft; a displacement shaft including a support shaft portion and a pivot shaft portion that are parallel and eccentric to each other, the support shaft portion rotatably supported to the circular hole of the trunnion through a radial bearing, the pivot shaft portion being protruded from an inner surface of the middle portion of the trunnion; a power roller nipped between the concave surfaces of the pair of disks while being rotatably supported on an outer circumferential surface of the pivot shaft portion; and a thrust bearings located between the power roller and the inner surface of the middle portion of the trunnions. An eccentric quantity of the displacement shaft being a distance between the support shaft portion and the pivot shaft portion is within a range from 5 mm to 15 mm.

Abstract: A substrate 2 is autorotatably installed in a vacuum chamber 1 at an upper part thereof. MgF2 granules 3 as a film source material are put in a quartz boat 4 and mounted on a magnetron cathode 5. The magnetron cathode 5 is connected through a matching box 6 to a 13.56 MHz radio frequency power source 7. Cooling water 8 for holding the temperature of the magnetron cathode 5 constant flows on a lower face of the magnetron cathode 5. A side face of the vacuum chamber 1 is provided with gas introduction ports 9, 10 for introducing gas in the vacuum chamber 1. A shutter 11 is placed between the magetron cathode 5 and the substrate 2. This structure provides a process enabling forming a thin film at a high speed by sputtering, especially, a high speed sputtering enabling forming a thin fluoride film free of light absorption.

Abstract: A substrate 2 is autorotatably installed in a vacuum chamber 1 at an upper part thereof. MgF2 granules 3 as a film source material are put in a quartz boat 4 and mounted on a magnetron cathode 5. The magnetron cathode 5 is connected through a matching box 6 to a 13.56 MHz radio frequency power source 7. Cooling water 8 for holding the temperature of the magnetron cathode 5 constant flows on a lower face of the magnetron cathode 5. A side face of the vacuum chamber 1 is provided with gas introduction ports 9, 10 for introducing gas in the vacuum chamber 1. A shutter 11 is placed between the magnetron cathode 5 and the substrate 2. This structure provides a process enabling forming a thin film at a high speed by sputtering, especially, a high speed sputtering process enabling forming a thin fluoride film free of light absorption.

Abstract: An induction-hardened rolling bearing device used by disposing rolling elements in a raceway track member, with excellent cold drawability and improved wear resistance and extended service life, in which ingredients of an alloy for the raceway track member contain, from 0.40 to 0.90% of C, from 0.05 to 0.80% of Si, from 0.10 to 2.0% of Mn, from 0.05 to 0.50% of Ti and 0.03% or less of N, on the weight basis, induction hardening is applied at least to the raceway surface of the raceway track member, and Ti carbide and Ti carbonitride each having an average particle diameter of from 5 to 100 nm are dispersed on the surface and in the steels of the raceway track member to make the hardness of the raceway surface to HRC 59 or more.

Abstract: A toroidal type continuously variable transmission, includes: at least one pair of disks concentrically disposed on each other and rotatably supported independent from each other; a trunnion swingable about a pivot shaft; a displacement shaft including a support shaft portion and a pivot shaft portion that are parallel and eccentric to each other, the support shaft portion rotatably supported to the circular hole of the trunnion through a radial bearing, the pivot shaft portion being protruded from an inner surface of the middle portion of said trunnion; a power roller nipped between the concave surfaces of the pair of disks while being rotatably supported on an outer circumferential surface of the pivot shaft portion; and a thrust bearings located between the power roller and the inner surface of the middle portion of the trunnions. An eccentric quantity of the displacement shaft being a distance between the support shaft portion and the pivot shaft portion is within a range from 5 mm to 15 mm.

Abstract: A toroidal type continuously variable transmission, includes: at least one pair of disks concentrically disposed on each other and rotatably supported independent from each other; a trunnion swingable about a pivot shaft; a displacement shaft including a support shaft portion and a pivot shaft portion that are parallel and eccentric to each other, the support shaft portion rotatably supported to the circular hole of the trunnion through a radial bearing, the pivot shaft portion being protruded from an inner surface of the middle portion of said trunnion; a power roller nipped between the concave surfaces of the pair of disks while being rotatably supported on an outer circumferential surface of the pivot shaft portion; and a thrust bearings located between the power roller and the inner surface of the middle portion of the trunnions. An eccentric quantity of the displacement shaft being a distance between the support shaft portion and the pivot shaft portion is within a range from 5 mm to 15 mm.

Abstract: A substrate 2 is autorotatably installed in a vacuum chamber 1 at an upper part thereof. MgF2 granules 3 as a film source material are put in a quartz boat 4 and mounted on a magnetron cathode 5. The magnetron cathode 5 is connected through a matching box 6 to a 13.56 MHz radio frequency power source 7. Cooling water 8 for holding the temperature of the magnetron cathode 5 constant flows on a lower face of the magnetron cathode 5. A side face of the vacuum chamber 1 is provided with gas introduction ports 9, 10 for introducing gas in the vacuum chamber 1. A shutter 11 is placed between the magnetron cathode 5 and the substrate 2. This structure provides a process enabling forming a thin film at a high speed by sputtering, especially, a high speed sputtering process enabling forming a thin fluoride film free of light absorption in a high speed by sputtering.

Abstract: A power roller of a power roller bearing in a half-toroidal type continuously variable transmission is manufactured as follows. In step S1, a work used as material is heated up to a temperature suitable for forging. In step S2, the work is pressed by using a first die set, with its end face being held. In step S3, the work is forged by using a second die set. The work is formed into a work having a curved face corresponding to a traction surface, a hole corresponding to a center hole, and a recess corresponding to a raceway groove. In step S4, the work is punched by using a third die set. In step S5, the work is subjected to a cutting process and a heating process, thereby obtaining the power roller.

Abstract: A cam disk for use in a loading cam mechanism of a toroidal type continuously variable transmission comprises a first projecting portion, a second projecting portion, a flange portion, a cam surface, a bearing raceway and a corner section. The cam disk has metal flows along the cam surface, metal flows along a surface of the raceway, and metal flows along a surface of the corner section. To produce the cam disk, material is shaped into a predetermined form through a first forging step using a first die unit, a second forging step using a second die unit, a third forging step using a third die unit, a finishing step, etc. The metal flows are also formed in these steps.

Abstract: A linear guide bearing device includes a rail, a bearing supported by the rail and rectilinearly movable along the axial direction of the rail, and rolling members interposed between the rail and the bearing to roll along with motion of the bearing. At least one of the rail and the bearing is made of induction-hardened steel including 0.6 to 0.9 wt % of carbon, 0.05 to 0.25 wt % of silicon, 0.3 to 0.9 wt % of manganese, 0.1 to 0.5 wt % of chromium, 0.2 to 1.0 wt % of molybdenum, and residual portion as iron and unavoidable impurities, and the induction-hardened steel has a total content of carbon, manganese, and molybdenum, which satisfies predetermined inequalities.

Abstract: There is provided a trunnion for a toroidal continuously variable transmission in which the material is strengthened against the wear and plastic deformation of a trunnion. The trunnion includes a base portion having a body portion, which connects and supports a base end portion of a displacement shaft at a surface intermediate portion, and a pair of plate portions, in which an edge apart from the body portion is a tip end edge, and a pair of axis (shaft) portions protruding from the outside surfaces of the plate portions in opposite directions to each other. The toroidal continuously variable transmission is characterized in that at least the rolling surface of a radial needle bearing for supporting the tilted rotation of the trunnion has a hardness not lower than HRC55, and a core portion has a hardness not lower than HRC20 and not higher than HRC45.

Abstract: An outer race of a thrust ball bearing supporting a thrust load applied to a power roller is rotatably supported around a displacement shaft. A portion in which the contact pressure between an outer race track and the rolling surface of a rolling member is high changes so that the fatigue of the outer race track does not progress locally. Also, the power roller and the outer race are subjected to predetermined treatment and working. Irrespective of a great thrust load applied during operation, stress is alleviated and the lubricating property of the portion of contact is made good to thereby prevent cracks or early wear from occurring.

Abstract: A rolling bearing comprises races including an inner race and an outer race formed of an alloy steel material; and a plurality of rolling elements formed of a ceramic material and interposed between the inner race and the outer race in such a manner as to be capable of rolling, wherein at least one of the inner race and the outer race is formed of an alloy steel containing 0.7-1.5 wt. % Si, 0.5-2.0 wt. % Cr, and 0.5-2.0 wt. % Mo in a steel, and is subjected to carbonitriding treatment on the surface of the alloy steel material. The rolling bearing excels in the durability and heat resistance even if it is used in a high-temperature high-speed environment, and does not cause a noise fault.