Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
  • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
  • H01J9/32—Sealing leading-in conductors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
  • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
  • H01J9/32—Sealing leading-in conductors
  • H01J9/323—Sealing leading-in conductors into a discharge lamp or a gas-filled discharge device

Definitions

• the present invention relates to the complete production of a fluorescent bulb with a tubular base with two stages of electrodes and a cylindrical envelope.
• the bell is blown, which corresponds to the following heavy operations in the manufacturing process. These are, melting, blowing, bursting, deburring, re-burning, flaring, annealing.
• the invention therefore relates to a bulb with notable improvements when in its manufacture, not tament the foot alone forming three quarters of said bulb.
• the production of the bulb according to the invention is done in three phases,
• the manufacture of the foot is new in that it is carried out entirely with tubular glass elements (1,7) and at the maintenance of a free central channel for the passage of the current supply wires (24) to the electrodes second stage (17-18) (fig. 2, fig. 9).
• the foot tube (1) with a diameter of 9 to 35 millimeters, 12 according to the invention is cut from cane, in 40 mm sections and then flared (2) in an automatic machine (fig. .1). Then, it is fixed on a lathe (T) with conical mandrel
• the foot electrodes (4, 5) or first stage are kept fixed in two dies of a sliding block (12) itself hollow in its center (8) to let pass a conical punch (16) graphite or other, the part of the tube to be melted being 1 cm from the end,
• the foot electrodes are exposed up to a centimeter or more from the area, towards the outside of the tube (1).
• the tube (7) is retracted which will then carry the second pair of electrodes, along the length of the area to be melted.
• This tube is driven by the second head of the lathe.
• the torch (11) melts said zone and the molten glass (15) collapses, traps the electrodes (4, 5).
• the molten part is crushed according to the cut, it is applied to the molten zone (15) trapping the electrodes (4, 5), which then form two glass-metal passages (6) in the glass crushed (3) while an internal and axial punch (16) previously retracted either by the tube (7) for supporting the second electrodes, or by the foot tube (1). comes (fig.8) at the level of the crushed molten glass to maintain the internal diameter of the tube (7) free of any noticeable deformation. This is to keep the passage of the current supply wires (24) to the electrodes of the second stage free.
• the two tubes are held for operation in two jaws, and a linkage system controls the punch and the clamp. (fig. 7)
• the shank (9) is welded close to the crushing zone P, so that the length M delimiting the shank of the foot flaring (2) for welding as short as possible.
• the diameter of the envelope chosen also partly corresponds to the power of the bulb to be produced and its emission in Lumens, by the total of its emitted-sive surface.
• the glass of the same type as that of the base is cut into cylinders from 200 to 800 mm, then passed into a jumping machine, separated and melted in its center giving two round bottoms, at the end (22) of the envelope.
• a variant consists in making a reverse semi-hemispherical throttling, then in separating the tubes, putting them face to face, welding them, stretching the molten glass, and remaking two round bottoms.
• the envelopes (21) are filled with fluorescent paste.
• Various methods are known for applying the electro-luminescent material to the walls of a discharge tube, in particular:
• the method used according to the invention is the filling of each enclosure with the pasty solution, then tilting of the solution.
• the envelopes are placed upright, opening upwards and are filled with dough.
• a sensor or a photocell stops the filling and causes the enclosure to tip over, by a mechanical device, this in a container, the envelope is thus kept open down several minutes, so that only one film remains on its walls.
• a variant consists of a jet of said paste towards the walls, in horizontal or vertical rotation of the tube provided with a certain quantity of paste which moving then covers the walls of the tube. It is necessary to evacuate the surplus.
• a thin stream of air is sent into the enclosure, by a hollow rod which is advanced more or less towards the bottom (22) of the enclosure.
• the tube is placed in a tubular oven at more than 500 degrees centigrade for pyrolization of the dough; the paste forming only the binder and the support of the fluorescent material.
• the tube is gradually returned to the oven, starting with the closed end.
• the foot (1,2) is gradually warmed in order to withstand the thermal shock of its welding on the envelope.
• the extremities of this one are rid of fluorescent powder on 2 to 4 mm, then the bulb is welded using a lathe, envelope on the left in the jaws, and foot on the right maintained by the rod of queusot.
• the weld according to the preparation of the envelope can be with a round edge (30) or a straight edge (29) (fig. 10), in this case, the Edison or other standardized base can be fitted with a semi-hemispherical part (fig. .12) or flat, fluorescent tube cap type (fig. 11).

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Vessels And Coating Films For Discharge Lamps (AREA)
• Forging (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9352167

Family Applications (1)

Country Status (5)

Family Cites Families (4)

• 1987
  • 1987-06-17 FR FR8708486A patent/FR2616962B1/fr not_active Expired - Lifetime
• 1988
  • 1988-06-14 KR KR1019890700280A patent/KR920007422B1/ko not_active Expired
  • 1988-06-14 EP EP88905865A patent/EP0366697A1/de not_active Withdrawn
  • 1988-06-14 AU AU19635/88A patent/AU1963588A/en not_active Abandoned
  • 1988-06-14 WO PCT/FR1988/000304 patent/WO1988010507A1/fr not_active Ceased

Non-Patent Citations (1)

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