摘要:
A mercury supplying method capable of always supplying a constant amount of mercury into a chamber part easily by executing measurement and ejection of the mercury at the same time. A small diameter pipe as a mercury supply path, is inserted through a glass tube elongating from a chamber part of an arc tube from above so as to have the tip part thereof substantially reaching into the chamber part, and connecting the upstream side of the sealed mercury supply path (mercury barrel) with a gas pressure adjuster. The gas pressure adjuster keeps the inside of the mercury supply path (mercury barrel) at a predetermined pressure so as to maintain the inside of the small diameter pipe in the state filled with mercury as well as applying a predetermined pressure to the mercury in the small diameter pipe for a predetermined time and thus ejecting a predetermined amount of mercury from the small diameter pipe tip part so as to be dropped and supplied to the chamber part. Measurement and ejection of the mercury can be executed at the same time with the small diameter pipe inserted through the glass tube of the arc tube from above. A predetermined amount of mercury can always be supplied into the chamber part in a short time.
摘要:
In the manufacture of arc tubes for use as light sources of vehicle headlamps, there is first prepared a semifinished arc tube by inserting one electrode assembly into a tubular glass envelope through one end thereof and by sealing this end. The semifinished arc tube is then placed in communication with a hermetically enclosed space filled with argon under pressure, with the consequent introduction of the inert gas into the glass envelope through a second end thereof. Another electrode assembly and chemicals such as a metal halide and mercury are then introduced from the enclosed space into the semifinished arc tube through the second end, totally without contact with the atmospheric air. Then, with the glass envelope placed out of communication with the enclosed space, the argon is exhausted from within the envelope, and xenon is charged instead into the envelope through the second end, which is closed subsequently.
摘要:
A method of manufacturing an arc tube for a discharge lamp unit, incorporating a primary pinch-sealing step for mounting an electrode assembly in an open end of a glass tube W with a chamber portion 12. The electrode assembly comprises an electrode rod 6, a connecting foil 7 and a lead wire 8 integrally connected in series. The electrode assembly is inserted into an open end of the glass tube W such that a leading end of the electrode rod projects into the chamber portion 12. A temporary pinch seal region L1 of the glass tube W is pinch-sealed such that a portion of the connecting foil that is connected to the lead wire is contacted by the glass tube W. A vacuum is maintained inside the glass tube and a main pinch seal region L2 of the glass tube is pinch-sealed such that a portion of the connecting foil connected to the electrode rod is contacted by the glass tube. When the main pinch seal region L2 of glass tube W is pinch-sealed, the negative pressure in the glass tube W is exerted on the softened sealed chamber portion 12 owing to supplied heat as well as the pressure exerted from the pincher 26b. Thus, the glass layer 15 is pressed against the surface of the molybdenum foil 7 so that hermetic contact is realized.
摘要:
A discharge lamp electrode having a spherical end portion which serves as a discharge part and has a diameter larger than the remaining base part is formed by simultaneously applying a plurality of laser beams to one end portion of a rod-shaped material of tungsten or tungsten alloy in different directions. Preferably, the rod-shaped material is held vertically while the laser beams are applied to its lower end portion.
摘要:
A heater has a cylindrical metallic shell, a heater body partly disposed in a front end portion of the metallic shell, an electrode disposed in a rear portion of the metallic shell and electrically connected to the heater body, and a terminal adapted to be capped with an electric connector. The terminal includes a terminal body for power supply to the heater body through the electrode and an engaging portion formed on an outer circumferential surface of the terminal body so as to be engageable with the electric connector. The electrode and the terminal body are formed integrally with each other. Such a heater can maintain good electrical conduction from the terminal to the heater body with its simple structure throughout an extended period of time.
摘要:
Supplying pellets without the risk of enlarging the apparatus size or moisture absorption of the pellets by disposing a rotation drum provided with a pellet storage room in a sealed case with an inert gas supply. The apparatus according to the present invention has a main body case with a rotation drum storage part formed therein, a lid mounted on the front surface opening part of the main body case, a rotation drum disposed rotatably in the rotation drum storage part, and a pellet supply nozzle elongating from the main body. Through holes having a size capable of inserting a pellet are provided on the circumferential wall of the rotation drum with an equal interval in the circumferential direction as well as the side wall of the main body case to be contacted slidably with the circumferential wall of the rotation drum. A gas supply hole for supplying an inert gas into the pellet storage room via the through holes, and a pellet discharging hole for discharging the pellets in the through holes at the time it coincides with the pellet storing through holes according to rotation of the rotation drum.
摘要:
A pair of chucks, which grip end portions of a cylindrical glass tube blank, are moved by a chuck moving mechanism toward each other, so that softened glass in an intermediate portion of the cylindrical glass tube blank is gathered, thereby forming a shape that is suitable for blow molding a light emitting tube portion. In the approaching movement, the position of one chuck is detected by using a laser position detector, and a result of the detection is fed back to the chuck moving mechanism, so as to control the approach distances of the chucks. The laser position detector detects the position of the chuck itself. Therefore, even when the positional relationship between the chuck and the chuck moving mechanism is varied, or backlash or deformation occurs in the chuck moving mechanism, the correct position of the chuck still is detected irrespective of such variation, backlash or deformation. Consequently, it is possible to effectively prevent the approach distances of the chucks from deviating from a desired value.
摘要:
An arc tube having a closed glass bulb having no broken-off portion, and a method of manufacturing the arc tube. A glass bulb is formed on a glass tube substantially at the middle. An electrode assembly is inserted into one end portion of the glass tube, and the one end portion is closed by pinch-sealing. A light emitting material is supplied into the glass bulb through the other end portion of the glass tube, another electrode assembly is inserted into the other end portion, and the latter is closed by pinch-sealing. Since the closed glass bulb has no broken-off portion, the arc tube is free from the difficulty that the distribution of light is adversely affected. Moreover, in manufacturing the arc tube of the invention, it is unnecessary to connect an exhaust tube to the glass tube. Therefore, the number of manufacturing steps is small, and the arc tube can be manufactured with ease.
摘要:
A glow plug according to one embodiment of the present invention includes a cylindrical metallic shell, an electrode rod disposed in a rear portion of the metallic shell, a heater disposed in a front portion of the metallic shell, and an electric insulator provided between an inner surface of the metallic shell and a circumferential surface of the electrode rod to keep the electrode rod insulated from the metallic shell. The metallic shell has a portion caulked to the electrode rod at a location axially corresponding to the electric insulator so that the circumferential surface of the electrode rod becomes deformed to define therein a recessed portion. The caulked portion is engaged in the recessed portion with the caulked portion with the electric insulator interposed between the caulked portion and the recessed portion, thereby securing the electrode rod in the metallic shell.
摘要:
The present invention provides an inexpensive heater exhibiting good gas-tightness, as well as a method for manufacturing the same. The heater includes a cylindrical metallic shell having a through-hole with a heating element disposed in the through-hole such that a portion projects from one end of the shell. The heater is adapted to generate heat upon application of electricity thereto. A rod-like axial member has a coil lead for electrically connecting a portion of the axial member and the heating element. A gas-tight seal member formed of an insulating polymeric material is interposed between the axial member and the inner surface of the through-hole in such a manner to surround the outer circumferential surface of the axial member. A crimped portion of the metallic shell brings the gas-tight seal member into close contact with the outer circumferential surface of the axial member and the inner wall surface of the through-hole form a gas tight seal.