Abstract: According to one or more embodiments of the disclosure, an alignment-overlay mark is provided. The alignment-overlay mark includes a pair of first marks and a plurality of second marks. The first marks extend in a first direction and are arranged in parallel to each other in a second direction. The second direction is perpendicular to the first direction. The second marks are between the first marks, extend in the second direction and are arranged in parallel to each other in the first direction.

Abstract: A tilting mechanism of a view device for a vehicle has a configuration in which a rotating section is rotatably supported on a shaft of a fixed portion. A helical compression spring is fitted onto the shaft. A plate is attached to the free-end side of the shaft via a washer. An outer circumferential surface of the shaft and a center hole of the washer include respective different diameter portions. A gap g in a radial direction is formed between the outer circumferential surface of the shaft and an inner circumferential surface of the center hole of the washer. The tilting mechanism includes a deviation mechanism. The deviation mechanism makes the gap g become narrow or zero at the different diameter portions at at least one place, the different diameter portions facing each other, by making the washer move relative to the shaft in the radial direction.

Abstract: A tilting mechanism of a view device for a vehicle has a configuration in which a rotating section is rotatably supported on a shaft of a fixed portion. A helical compression spring is fitted onto the shaft. A plate is attached to the free-end side of the shaft via a washer. An outer circumferential surface of the shaft and a center hole of the washer include respective different diameter portions. A gap g in a radial direction is formed between the outer circumferential surface of the shaft and an inner circumferential surface of the center hole of the washer. The tilting mechanism includes a deviation mechanism. The deviation mechanism makes the gap g become narrow or zero at the different diameter portions at at least one place, the different diameter portions facing each other, by making the washer move relative to the shaft in the radial direction.

Abstract: Provided is a coupling unit capable of accurately determining a relative position between connectors despite welding across main pipes and connectors in a lattice structure. A coupling unit includes connectors to be joined to ends of main pipes, and a connector interconnection member that interconnects connectors to one another. Each of the connectors includes: a fitted part fittable to the end of the main pipe; a detachable connection part detachably connectable to a counterpart connector provided to an end of the other lattice structure; an outer peripheral surface weldable to an outer peripheral surface of the end of the main pipe while the fitted part is fitted to the end of the main pipe; and a connected part to which an end of the connector interconnection member is to be connected.

Abstract: Provided according to the present invention are an adamantyl (meth)acrylate represented by formula (1), having a formazin standard turbidity of less than 1.7 NTU (Nephelometric Turbidity Unit) in methylethylketone or tetrahydrofuran, and also a (meth)acrylic copolymer comprising the adamantyl (meth)acrylate as a repeating unit: (in the formula, R1 represents hydrogen or a methyl group; R2 through R4 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having a carbon number of 1 to 3, an aryl group, an alkoxy group, an aryloxy group, a halogen group, an alkyl halide group, or a hydroxyalkyl group; and n1 represents 0 or 1).

Abstract: Provided according to the present invention are an adamantyl (meth)acrylate represented by formula (1), having a formazin standard turbidity of less than 1.7 NTU (Nephelometric Turbidity Unit) in methylethylketone or tetrahydrofuran, and also a (meth)acrylic copolymer comprising the adamantyl (meth)acrylate as a repeating unit: (in the formula, R1 represents hydrogen or a methyl group; R2 through R4 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having a carbon number of 1 to 3, an aryl group, an alkoxy group, an aryloxy group, a halogen group, an alkyl halide group, or a hydroxyalkyl group; and n1 represents 0 or 1).

Abstract: A door mirror base including a base main unit for holding a vehicular door minor and a gasket disposed between the base main unit and a vehicle body. The gasket includes a hook protruding toward a vehicle body side and to be hooked onto the vehicle body. The base main unit includes a reinforcing pin passed through the gasket and protruding toward the vehicle body side of the gasket along the hook. The reinforcing pin includes a locking portion exposed on the vehicle body side of the gasket and caught by a surface of the gasket on the vehicle body side. By visually recognizing the locking portion from the vehicle body side of the gasket, it can be confirmed that the reinforcing pin is sufficiently passed through the gasket. Additionally, the locking portion makes it difficult for the reinforcing pin to be removed from the gasket.

Abstract: A glass polarizer having an excellent transmittance and extinction ratio with respect to light in the visible light range including blue using silver halide containing glass as a starting material is provided. A manufacturing method according to the present invention to manufacture glass polarizers is characterized in that borosilicate glass in which silver halide particles are dispersed and deposited by heat treatment is reduced to generate metallic silver particles from at least a portion of silver halide and then, heated for stretching to generate silver halide particles oriented and stretched in the glass.

Abstract: A glass polarizer having an excellent transmittance and extinction ratio with respect to light in the visible light range including blue using silver halide containing glass as a starting material is provided. A manufacturing method according to the present invention to manufacture glass polarizers is characterized in that borosilicate glass in which silver halide particles are dispersed and deposited by heat treatment is reduced to generate metallic silver particles from at least a portion of silver halide and then, heated for stretching to generate silver halide particles oriented and stretched in the glass.

Abstract: A polarizing glass comprising geometrically anisotropic particles dispersed in an oriented manner in at least the surface of a glass base body. The glass base body is denoted by the weight percentages of 50-65 percent SiO2, 15-22 percent B2O3, 0-4 percent Al2O3, 2-8 percent ZrO2, 6 percent <Al2O3+ZrO2<12 percent, 6-16 percent R2O (where R denotes at least one from among Li, Na, and K), 0-3 percent Li2O, 0-9 percent Na2O, 4-16 percent K2O, Li2O+Na2O<K2O, 0-7 percent BaO and/or SrO, and 0-3 percent TiO2. The glass base body comprises per 100 weight percent of essentially the above composition at least 0.15-1.0 percent Ag and at least the chemical equivalent to Ag of Cl and/or Br; and the geometrically anisotropic silver particles are metallic Ag particles. The polarizing glass is employed in optical products such as optical isolators.

Abstract: A polarizing glass comprising geometrically anisotropic particles dispersed in an oriented manner in at least the surface of a glass base body. The glass base body is denoted by the weight percentages of 50-65 percent SiO2, 15-22 percent B2O3, 0-4 percent Al2O3, 2-8 percent ZrO2, 6 percent <Al2O3+ZrO2<12 percent, 6-16 percent R2O (where R denotes at least one from among Li, Na, and K), 0-3 percent Li2O, 0-9 percent Na2O, 4-16 percent K2O, Li2O+Na2O<K2O, 0-7 percent BaO and/or SrO, and 0-3 percent TiO2. The glass base body comprises per 100 weight percent of essentially the above composition at least 0.15-1.0 percent Ag and at least the chemical equivalent to Ag of Cl and/or Br; and the geometrically anisotropic silver particles are metallic Ag particles. The polarizing glass is employed in optical products such as optical isolators.

Abstract: Chalcogenide glass fibers having a glass core with two cladding glass layers, the second cladding glass layer having a refractive index lower than that of the core glass and higher than that of the first cladding glass. The core glass does not contain germanium. Glass fiber having this core-cladding structure is mechanically strong and exhibits only small transmission loss of infrared light passing through the fiber.

Abstract: A process for producing a preform for a chalcogenide glass fiber which comprises inserting a cladding tube having contained therein a chalcogenide glass rod for core into a quartz tube having at its bottom a nozzle having an aperture smaller than the outer diameter of the cladding tube, locally heating the bottom of the quartz tube and pulling the cladding tube having contained the glass rod for core and a process for producing a chalcogenide glass fiber by heating and drawing the preform thus obtained, by which processes the devitrification of glass and the generation of bubbles in the core glass or at the core glass-cladding glass interface can be prevented and the adhesion between the core glass and the cladding glass can be improved. In particular, when the glass material for core does not contain Ge, a chalcogenide glass fiber having such a core-cladding structure that the transmission loss of the glass fiber when infrared light pass through the fiber is small and the mechanical strength is high.

Abstract: In a method of manufacturing a preform for a nonoxide glass fiber, cladding and core glass materials are placed in a cylinder of an extrusion apparatus such that ground end faces of the respective cladding and core glass materials are in contact with each other and such that the cladding glass material is located adjacent a molding section of the extrusion apparatus. The cladding and core glass materials are heated within inert-gas atmosphere, to their respective temperatures equal to or below their respective sag points and equal to or above their respective crystallization start temperatures. An extrusion punch of the extrusion apparatus is pushed within the atmosphere, to extrude the cladding and core glass materials through a molding nozzle in the molding section while the cladding and core glass materials are in fusible contact with each other, thereby forming the preform of a core and cladding structure.

Abstract: A single mode laser glass fiber showing excellent laser oscillation characteristics even at a short fiber length can be efficiently obtained using a phosphate laser glass with excellent laser characteristics.

Abstract: The fluoride glass of the present invention, which contains, as anions, a small amount of chlorine in addition to fluorine, has advantages such as (1) it is less liable to crystallize as compared with a fluoride glass containing no chlorine and yet shows substantially no deterioration in chemical durability and mechanical strength due to chlorine inclusion and (2) its refractive index can easily be changed by changing the addition amount of chlorine.

Abstract: A high quality fluorophosphate laser glass free from bubbles, inclusions and coloring can be obtained by melting a fluorophosphate glass having a total oxide content of 5 to 30% in terms of cationic %, in a carbon container under a non-oxygen gas atmosphere.

Abstract: An tinted eyeglass lens having a photochromic gradient and a process for producing the same are disclosed. The photochromic gradient is provided by changing the particle diameter of silver halide particles in the face direction of the glass.

Abstract: A fluoride glass comprising AlF.sub.3, ZrF.sub.4 and/or HfF.sub.4, and at least one compound selected from CaF.sub.2, SrF.sub.2 and BaF.sub.2, and a fluoride glass comprising these components and at least one additional component selected from MgF.sub.2, YF.sub.3, NaF and other like compounds have the advantages that there hardly occurs crystallization in the production thereof, and that they are excellent in chemical durability, high in surface hardness, so that they can ideally serve as glass to be used for low loss optical fiber, infrared optical fiber for thermometer, infrared laser window, etc.

Abstract: A Faraday rotation single-mode fiber having a high Verdet constant is disclosed, the core and the cladding of the fiber being made of a glass having the following composition: 26 to 38 mol % SiO.sub.2, 18 to 34 mol % B.sub.2 O.sub.3, 17 to 26 mol % Al.sub.2 O.sub.3, 18 to 32 mol % Tb.sub.2 O.sub.3, 0 to 5 mol % ZrO.sub.2, 0 to 5 mol % Ce.sub.2 O.sub.3, 0 to 5 mol % Pr.sub.2 O.sub.3, 0 to 5 mol % Dy.sub.2 O.sub.3 and 0 to 5 mol % Ho.sub.2 O.sub.3, provided that the total amount of the above ingredients is not less than 97 mol % and the total amount of Ce.sub.2 O.sub.3, Pr.sub.2 O.sub.3, Dy.sub.2 O.sub.3 and Ho.sub.2 O.sub.3 is 0 to 5 mol %.