Abstract: A tire vulcanization mold in which a surface roughness in the groove molding portion of the tread molding surface is made smaller than a surface roughness in the land portion molding portion, in which a surface roughness in the groove molding portion is minimized to 0.12 ?m or less in a range including at least a main groove molding portion, and in which a surface roughness in the land portion molding portion is made to be 3.2 ?m or more, is used to manufacture a tire, and when cleaning the tread molding surface, the tread molding surface is irradiated with a laser beam to remove contaminant adhered to the tread molding surface.

Abstract: Provided are a cleaning device and a method for cleaning a vulcanization mold. At the time of cleaning a molding surface of a vulcanization mold by irradiating with a laser beam from a laser head, an inert gas is supplied from a supply nozzle and an irradiation range of the molding surface irradiated with the laser beam is brought into an atmosphere of the inert gas.

Abstract: A tire vulcanization mold in which a surface roughness in the groove molding portion of the tread molding surface is made smaller than a surface roughness in the land portion molding portion, in which a surface roughness in the groove molding portion is minimized to 0.12 ?m or less in a range including at least a main groove molding portion, and in which a surface roughness in the land portion molding portion is made to be 3.2 ?m or more, is used to manufacture a tire, and when cleaning the tread molding surface, the tread molding surface is irradiated with a laser beam to remove contaminant adhered to the tread molding surface.

Abstract: Provided are a cleaning device and a method for cleaning a vulcanization mold. At the time of cleaning a molding surface of a vulcanization mold by irradiating with a laser beam from a laser head, an inert gas is supplied from a supply nozzle and an irradiation range of the molding surface irradiated with the laser beam is brought into an atmosphere of the inert gas.

Abstract: A surface lighting device includes a light guiding plate having a light incident surface formed at one end surface and a light exit surface formed on a front surface thereof; an elongated light source facing the light incident surface; a light source reflector which reflects light emitted from the elongated light source toward the light incident surface; a prism sheet, wherein an array of minute parallel prism projections is formed on a surface thereof, the array of minute parallel prism projections facing the light exit surface; a regular reflection type reflector facing a rear surface of the light guiding plate; a light guiding device for guiding light emitted from the elongated light source to two portions of the light incident surface which respectively face opposite ends of the elongated light source; and a diffuser, formed on the light incident surface, which diffuses incident light thereon.

Abstract: A surface lighting device including a light guiding plate (11) including two light incident surfaces (11a) formed at opposite end surfaces of the light guiding plate and a light exit surface (11b); two elongated light sources (12) that face the two light incident surfaces; and a reflector plate (14) positioned to face a rear surface of the light guiding plate, and to reflect light toward said light exit surface. The light guiding plate includes (i) alight projecting device (11d) that projects light from the light exit surface; (ii) a light quantity control device that controls a quantity of the light to be emitted, by the light projecting device, from the light exit surface; and (iii) a light condensing device (11e) that condenses the light to be emitted from the light exit surface.

Abstract: A surface lighting device includes a light guiding plate having a light incident surface formed at one end surface and a light exit surface formed on a front surface thereof; an elongated light source facing the light incident surface; a light source reflector which reflects light emitted from the elongated light source toward the light incident surface; a prism sheet, wherein an array of minute parallel prism projections is formed on a surface thereof, the array of minute parallel prism projections facing the light exit surface; a regular reflection type reflector facing a rear surface of the light guiding plate; a light guiding device for guiding light emitted from the elongated light source to two portions of the light incident surface which respectively face opposite ends of the elongated light source; and a diffuser, formed on the light incident surface, which diffuses incident light thereon.