Abstract: A light irradiation apparatus in which high peak irradiance is obtained and the heat influence on the article being irradiated with light is reduced, and also an inkjet printer which has such a light irradiation apparatus in which pictures with high image quality can be reliably made and the amount of heat influence on the recording medium is low is achieved using a light irradiation apparatus having a discharge lamp of the short arc type and a reflection component for reflecting the light of this discharge lamp. The light of the discharge lamp is radiated in a state in which it is focused by the reflection component so as to extending linearly on the light irradiation area.

Abstract: A light irradiation device that is capable of good irradiance uniformity in the lengthwise direction and that is applicable to an inkjet printer. A light-emitting portion of a short-arc type discharge lamp is positioned at the first focal point of a reflector that has a reflecting surface in the shape of an ellipsoid of revolution, and the light from the discharge lamp is reflected by the reflector and is focused at the second focal point; after which the light is incident on multiple, columnar rod lenses 14. Of the light that is incident on the rod lenses, the light along the axial direction is focused at the second focal point of an elliptical reflector without being affected by the rod lenses, and the light along the direction perpendicular to the axial direction is focused by the rod lenses and then spreads and irradiates the light irradiation surface.

Abstract: An ultraviolet ray emitting element package comprises a condenser lens, and an ultraviolet ray emitting element which is arranged approximately at a center and in a bottom side of the condenser lens and which is apart from a bottom of the condenser lens, wherein a refractive index difference reduction substance having an ultraviolet ray durability is filled in a gap formed by the ultraviolet ray emitting element and the bottom of the condenser lens.

Abstract: To prevent clogging of a nozzle of a printing head, a light irradiator for an ink jet printer is composed of a short arc type discharge lamp (10) and optical elements used for linearly condensing light from the lamp (10), e.g., an elliptic light condensing mirror (20) and a rod lens (30) in order to linearly condense light emitted from the lamp onto a substrate (5). A slit-type light outlet (40) is provided on a bottom plate (60) of a housing (8) so that the direct light from the lamp cannot reach places on the substrate (5) in the vicinity of the nozzle (4) of a printing head (4), and antireflection material (70) is provided on the surface of the bottom plate (60) facing the substrate (5) so that the light emitted from the light irradiator and reflected by the substrate (5) can be absorbed by the antireflection material (70).

Abstract: In a printer, an image is formed by discharging a light curing type ink from a recording head on a recording medium and irradiating light from a light emission unit so as to harden the ink. The printer comprises a short arc type discharge lamp in which a pair of electrodes is provided in an electric discharge container so as to face each other a reflector which is provided so as to surround the discharge lamp, which has a concave face which reflect light from the discharge lamp wherein the pair of the electrodes are arranged so that a straight line formed by connecting the pair of electrodes, extends along an optical axis of the reflector, and wherein mercury of 0.08-0.30 mg/mm3, rare gas, and halogen is enclosed in the electric discharge container and a distance between electrodes is 0.5-2.0 mm.

Abstract: A light irradiation device and an inkjet printer equipped with the light irradiation device, the light irradiation device having a short-arc type discharge lamp with a pair of electrodes which face each other within a discharge vessel, a reflector surrounding the discharge lamp so as to reflect light from the discharge lamp, and a cylindrical lens that focuses light reflected by the reflector in a uniaxial direction in a manner forming a light irradiation zone having an elongated linear shape. Plural lamps with respective reflectors and lenses can be arranged in a row to increase the size of the linear irradiation zone formed.

Abstract: A light irradiation device that is capable of good irradiance uniformity in the lengthwise direction and that is applicable to an inkjet printer. A light-emitting portion of a short-arc type discharge lamp is positioned at the first focal point of a reflector that has a reflecting surface in the shape of an ellipsoid of revolution, and the light from the discharge lamp is reflected by the reflector and is focused at the second focal point; after which the light is incident on multiple, columnar rod lenses 14. Of the light that is incident on the rod lenses, the light along the axial direction is focused at the second focal point of an elliptical reflector without being affected by the rod lenses, and the light along the direction perpendicular to the axial direction is focused by the rod lenses and then spreads and irradiates the light irradiation surface.

Abstract: An ultraviolet ray emitting element package comprises a condenser lens, and an ultraviolet ray emitting element which is arranged approximately at a center and in a bottom side of the condenser lens and which is apart from a bottom of the condenser lens, wherein a refractive index difference reduction substance having an ultraviolet ray durability is filled in a gap formed by the ultraviolet ray emitting element and the bottom of the condenser lens.

Abstract: A light irradiation apparatus in which high peak irradiance is obtained and the heat influence on the article being irradiated with light is reduced, and also an inkjet printer which has such a light irradiation apparatus in which pictures with high image quality can be reliably made and the amount of heat influence on the recording medium is low is achieved using a light irradiation apparatus having a discharge lamp of the short arc type and a reflection component for reflecting the light of this discharge lamp. The light of the discharge lamp is radiated in a state in which it is focused by the reflection component so as to extending linearly on the light irradiation area. The inkjet printer has a head part with the above described light irradiation apparatus, the light from which sets ink of the photosetting type which has been applied to the recording medium.

Abstract: A particle counting device is improved to prevent adhesion impurities that result from condensation of condensation vapor on optical systems and the like in a particle detection area or the like of a measuring device to detect particles contained in the atmosphere or in certain gases and using condensation nuclei. In particular, in a particle measuring operation in which, in a chamber for saturated vapor that contains a liquid that can condense at a room temperature, a gas is added to a saturated vapor, the gas is introduced into a condensation part that is at a room temperature, the vapor is condensed on the particles as nuclei, and in which the particles, in a connected particle detection area, are measured, a heater is provided to keep the temperatures of the detection area, the connection pipe and the nozzle at least at a temperature higher than or equal to the temperature of the condensation part, to prevent adhesion impurities of condensation vapor on optical systems and the like in the detection area.

Abstract: An endless belt for the power transmission, wherein a plurality of block bodies each comprising a body member formed of a highly rigid material and provided at opposite side portions thereof with inclined surfaces being in frictional engagement with pulleys and a clamp member formed separately of said body member are arranged in a row and adjacent to one another on a belt-shaped endless carrier formed of fabric in such a manner that the endless carrier is clamped between the body members and the clamp members, the endless belt being of such an arrangement that the belt-shaped endless carrier formed of fabric is woven by warps disposed in the longitudinal direction and wefts disposed in the widthwise direction, with the wefts restraining the warps.