Abstract: The synthetic resin container according to the present invention has a waist dividing a container main body portion into upper and lower parts, wherein the waist is formed on an annular groove surrounding the main body portion to as to be convex toward the interior of the container. The annular groove has reinforcing ribs with a level higher than a groove bottom of the annular groove and lower than the surface of the main body portion. The container main body portion includes reinforcing lateral ribs each having a concave portion which is positioned at the same level as a surface of the container, which or forms a slight step relative to the surface of the container. The main body portion has a plurality of ridges converging toward the associated central convergent point, respectively, thereby defining multi-faceted concave walls inclined toward the associated convergent points, respectively.

Abstract: It is intended to provide a synthetic resin bottle, in which the stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned. The body 2 of the synthetic resin bottle is configured to have a smooth seal surface 8 with no irregularity over the entire circumference in the upper portion of the outer neck wall where no parting line is formed. In this configuration, a stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned.

Abstract: A chopper circuit generates a voltage to be supplied to a primary side of a transformer, and an inverter circuit supplies an output voltage of the chopper circuit to the primary side of the transformer in a positive phase or a negative phase. Thereby, an electric-discharge lamp connected to a secondary side of the transformer is lighted. A controlling section detects a lamp current, and thereby determines a type of the electric-discharge lamp. The controlling section decides the control value optimal for the chopper circuit and the inverter circuit on the basis of the determination result. The controlling section controls the chopper circuit and the inverter circuit with the decided control value. Thereby, the lighting device drives the electric-discharge lamp in an optimal state. For instance, the lighting device always makes the electric-discharge lamp lighting in a 100% light-modulated state regardless of its type.

Abstract: A bottle-shaped container according to the present invention includes a mouth portion (1) for discharging contents, a shoulder portion (2), a main body portion (3), and a bottom portion (4), wherein these portions are integrally molded and successively arranged with each other. An annular projection (5) surrounds the main body portion (3) and protrudes from a surface thereof, along a boundary between the shoulder portion (2) and the main body portion (3). Further, narrow grooves (6a, 6b) are provided on both sides of the annular projection (5) to extend along the same, respectively.

Abstract: In a bottle-shaped synthetic resin container having a body part of substantially rectangular tubular shape, groove ribs, having a comparatively wide vertical groove form, are depressingly provided at the centers in the width direction of flat wall portions of shoulder lower end parts, which are portions of a shoulder part that connect with the body part, to make these portions higher in rigidity and difficult to deform and, even when a deformation occurs, prevent the deformation from becoming a permanent deformation. Safe handling of the container is thus promoted, especially for the stacked storage of containers in a sideways-laid orientation.

Abstract: It is intended to provide a synthetic resin bottle, in which the stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned. The body 2 of the synthetic resin bottle is configured to have a smooth seal surface 8 with no irregularity over the entire circumference in the upper portion of the outer neck wall where no parting line is formed. In this configuration, a stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned.

Abstract: A bottle-shaped container according to the present invention includes a mouth portion (1) for discharging contents, a shoulder portion (2), a main body portion (3), and a bottom portion (4), wherein these portions are integrally molded and successively arranged with each other. An annular projection (5) surrounds the main body portion (3) and protrudes from a surface thereof, along a boundary between the shoulder portion (2) and the main body portion (3). Further, narrow grooves (6a, 6b) are provided on both sides of the annular projection (5) to extend along the same, respectively.

Abstract: The synthetic resin container according to the present invention has a waist dividing a container main body portion into upper and lower parts, wherein the waist is formed on an annular groove surrounding the main body portion to as to be convex toward the interior of the container. The annular groove has reinforcing ribs with a level higher than a groove bottom of the annular groove and lower than the surface of the main body portion. The container main body portion includes reinforcing lateral ribs each having a concave portion which is positioned at the same level as a surface of the container, which or forms a slight step relative to the surface of the container. The main body portion has a plurality of ridges converging toward the associated central convergent point, respectively, thereby defining multi-faceted concave walls inclined toward the associated convergent points, respectively.

Abstract: In a bottle-shaped synthetic resin container having a body part of substantially rectangular tubular shape, groove ribs, having a comparatively wide vertical groove form, are depressingly provided at the centers in the width direction of flat wall portions of shoulder lower end parts, which are portions of a shoulder part that connect with the body part, to make these portions higher in rigidity and difficult to deform and, even when a deformation occurs, prevent the deformation from becoming a permanent deformation. Safe handling of the container is thus promoted, especially for the stacked storage of containers in a sideways-laid orientation.

Abstract: A bottle-shaped container shows a large critical strength against buckling and is made of a reduced amount of synthetic resin material. A manufacturing method can manufacture such a bottle-shaped container. A lightweight bottle-shaped container made of synthetic resin and formed by biaxially-oriented blow-molding, characterized in that a wall thickness is increased to 109% or more of an average wall thickness of blow-molded pad of the wall at an infection point between a portion having a transversal cross sectional area and a portion having a different transversal cross sectional area in a cylindrical wall. The wall is thicker between the heel and the bottom, or at the waist, at the recessed rib, or at the projection.

Abstract: A dual tube type fluorescent lamp including a luminescence tube. The luminescence tube has a long and slender airtight glass bulb with a nonlinear form part, a pair of electrodes and a phosphor layer formed on the inside surface of the glass bulb. A gap is formed between the circumference of the luminescence tube and an outside glass tube. The luminescence tube encloses an electric discharge medium coating mercury and a rare gas. An inorganic substance layer is formed at least at the nonlinear form part either on the outer surface of the luminescence tube, on the inner surface of the outside glass tube, or both. The inorganic substance layer has a softening point higher than the softening point of the glass.

Abstract: A lighting device controls power to a discharge lamp according to the temperature detected by a lamp sensor, which detects temperature around the discharge lamp. The discharge lamp has an arc tube and an outer bulb between which an airtight space is defined. Therefore, the lamp can be actuated without reduction in luminosity even at low temperatures. Also, the lamp luminosity rises quickly.

Abstract: A low-pressure mercury vapor-filled discharge lamp has a glass arc tube and a glass outer tube disposed coaxially with the arc tube forming a space therebetween. A gas is disposed in the space. The arc tube contains a gas and is coated with a phosphor. A first seal hermetically seals the inner tube. A second seal seals the inner tube to the outer tube. The inner tube further contains a pair of cathodes coupled to Dumet wires extending from the interior of the inner tube to the outside of the lamp structure. The pressure in the space is set at not more than 1 Pa, which is nearly high vacuum. The longer the radial dimension of the space, the greater the heat retaining capacity and the better the temperature characteristics which can be obtained. However, by setting the pressure of the space at 1 Pa or less, the optimum heat retaining capacity can be obtained while reducing the diameter of the low-pressure mercury vapor filled discharge lamp 1.

Abstract: The present invention relates to a refractory for casting process composed mainly of 0.3 to 10 wt % light burned magnesia, 3 to 30 wt % micro fine calcined alumina, and the remainder of either sintered alumina, fused alumina and MgO-Al.sub.2 O.sub.3 spinel or sintered alumina and MgO-Al.sub.2 O.sub.3 spinel or fused alumina and MgO-Al.sub.2 O.sub.3 spinel.