Abstract:
A vessel according to the present invention is made of a transparent or translucent material; and comprises a main portion and end portions which are integrated into the main portion, respectively. At least a central area of the main portion has a thickness smaller than at the respective end portions and at the boundary areas of the respective end portions and the main portion. An inner diameter of the respective end portions is not more than about 2 mm.
Abstract:
It is provided a ceramic vessel 1A for a high pressure discharge lamp and for filling an ionizable luminous substance and a starter gas in the inner space of the vessel. The discharge vessel 1A has a tubular central luminous portion 2A, and a pair of tubular end portions 3 protruding from both ends of said central luminous portion, respectively. Each of the end portions 3 has a maximum wall thickness "l" of 0.5 times or larger and 0.9 times or smaller of the wall thickness "t" of the central luminous portion 2A. A ceramic discharge vessel is thereby provided enabling for improving the luminous efficiency of the high pressure discharge lamp.
Abstract:
A vessel according to the present invention is made of a transparent or translucent material; and comprises a main portion and end portions which are integrated into the main portion, respectively. At least a central area of the main portion has a thickness smaller than at the respective end portions and at the boundary areas of the respective end portions and the main portion. An inner diameter of the respective end portions is not more than about 2 mm.
Abstract:
PROBLEM TO BE SOLVED: To provide a translucent polycrystalline sintered body which has high linear transmittance of light, has large bending strength and is suitable for manufacturing of an arc tube used for a high-intensity discharge lamp such as a high-pressure sodium lamp and a metal halide lamp. SOLUTION: The translucent polycrystalline sintered body, made of alumina as a principal component, and is suitable for manufacturing the arc tube used for the high-intensity discharge lamp, wherein the particles of the sintered body has an average particle diameter of 35-70 μm, preferably 50-60 μm. A linear transmittance at the time of a flat plate shape of the sintered body with a thickness of 0.5 mm is 30% or more, preferably 50% or more. A ratio of the maximum value and the minimum value of the linear transmittance of a visible light zone (360-830 nm) at the time of the flat plate shape with a thickness of 0.5 mm is 2:1 to 1:1. A bending strength of the sintered body is 250 MPa or more, preferably 300 MPa or more. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a light emitting vessel for a high pressure discharge lamp which can prolong the life of the lamp even if the discharging space is cylinder- shaped. SOLUTION: The light emitting vessel is composed of a cylinder-shapes trunk part 1 forming a light emitting space of discharge, ring-shaped sealing parts 2, 2 sealing both ends of the trunk part 1, respectively, and capillary parts 3, 3 extruding outsides from almost center part of the sealing part so as to face each other in opposite direction, and fixing an inserted discharge electrodes, which are formed so as to have translucency by using alumina as a main component and adding MgO, and the wall thickness of the trunk part at the boundary part between the trunk part 1 and the sealing part 2 is made thicker than the wall thickness at the neighbor of the middle part of the light emitting space of discharge by forming a taper part 4a.
Abstract:
PROBLEM TO BE SOLVED: To reduce the corrosion of frit glass caused by an illuminant material when emission vessel is used in a high pressure discharge lamp. SOLUTION: Atrunk part 1 forms the discharge space on its inside and has opening parts for inserting electrode member inserting parts 3a, 3b at both ends of the discharge space. The electrode member inserting parts 3a, 3b have fins 6a, 6b arranged between inserting parts 4a, 4b and exposed parts 5a, 5b respectively. Since heat is radiated from the vicinities of fins 6a, 6b, liquefaction of an illuminant material in through holes of electrode member inserting parts 3a, 3b is accelerated, the liquefied illuminant material is solidified before it enters an exposed part in the inner space of the trunk 1 of the frit glasses 11a, 11b. The illuminant materials 12a, 12b solidified in this manner are attached to the inside of the through holes of the electrode member inserting parts 3a, 3b. This reduces the corrosion of the frit glasses 11a, 11b caused by contacting of the liquefied illuminant materials with part the exposed in the inner space of the trunk 1 of the frit glasses 11a, 11b.
Abstract:
PROBLEM TO BE SOLVED: To cut a ceramic base material surely when obtaining a ceramic substrate by dividing the ceramic base material along a division groove.SOLUTION: A ceramic base material is divided into a plurality of substrate regions 2, and a division groove 7 is formed between adjoining substrate regions 2. The corner 8 of each substrate region 2 faces a cavity 9B connecting with the division groove 7, and has an arcuate shape. At the contact point P of the cavity 9B with the division groove 7, the arcuate corner 8 is tangent to the center line 7a of the division groove 7. A ceramic substrate is obtained by dividing the ceramic base material along the division groove 7.
Abstract:
PROBLEM TO BE SOLVED: To provide a luminous tube which simplifies production process, reduces color variations, and improves life properties, lamp efficiency, and reliability.SOLUTION: A first light emitting tube 10A includes a light emitting part 12 emitting light therein and a first ceramic tube 16A having a first narrow tube 14a and a second narrow tube 14b which are respectively and integrally formed on both sides of the light emitting part 12. In the first light emitting tube 10A, a first electrode 18a is inserted into the first narrow tube 14a of the first ceramic tube 16A to seal the first narrow tube 14a and a second electrode 18b is inserted into the second narrow tube 14b to seal the second narrow tube 14b, where the first electrode 18a is sealed in the first narrow tube 14a through thermal insertion.