Electric lamp and discharge devices – With getter
Patent
1997-01-08
1998-10-20
Patel, Ashok
Electric lamp and discharge devices
With getter
313559, 313560, 72 51, H01J 6124
Patent
active
058251278
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a method to produce a cap band for discharge lamps in which a substrate band is coated with a material to be introduced into a discharge lamp, especially a mercury alloy and/or a getter material; and to a cap band made by the method.
BACKGROUND
Published, Unexamined Japanese patent application 6-96728, discloses a low-pressure mercury vapor discharge lamp. This discharge lamp has a metal ring cap, which comprises two metal ring portions, in which one portion has a mercury-dispensing function while the other metal portion has no such function. The first of these metal portions comprises a nickel-coated iron substrate and a mercury alloy, which comprises a mercury-titanium alloy powder applied to the substrate.
The mercury alloy is located on one side, the inside of the ring portion, while getter is located on the other side, the outside of the ring portion. The amount of mercury to be introduced into the discharge lamp is determined by varying the length of the first portion. That is, if the amount of mercury is to be increased, the length of the first metal portion mentioned above is increased.
The ring cap of the previously known discharge lamp is accordingly not formed in one piece but rather comprises a plurality of components. This increases both the costs of production of the ring cap and the costs of production of the discharge lamp.
THE INVENTION
Briefly, a substrate band, having a width of the length of the entire cap band to be formed, or at least a portion thereof, is coated with at least one material to be introduced into the discharge lamp, typically a mercury alloy and/or a getter material. This base or substrate band is severed transversely to its longitudinal direction, to then form the cap band, or a portion thereof, for example in combination with an uncoated cap band strip.
According to the invention, this object is attained by a
The invention has the advantage that from a predetermined length of cap band produced by the method of the invention, many portions can be made, and each portion can be processed, e.g. by cutting in a simple way, in particular to make a one-piece ring cap.
As an example, the width of the substrate band used in the method of the invention is approximately 12 to 55 mm. If one assumes that for a ring cap a 5-millimeter-wide cap band should be provided, then from one running meter of, for example, 42 mm width, of substrate band, 200 cap bands can be made by the method of the invention; that is, 199 cuts are required. In the prior art, in which a substrate band has a width of 5 to 7 mm, only 23 cap bands can be made from 1 meter of substrate to provide caps with full ring cap circumference of 42 mm.
The application of getter and mercury alloy is multiple times more expensive than the material itself. If according to the invention cutting is done crosswise to the application of material, and moreover coating is done on one side, then the production speed for one portion (cap band) is multiple times greater (depending on the width BT, FIGS. 3, 4), for the same machine speed.
In a further advantageous embodiment of the method of the invention, the cap band is produced by coating the substrate band on one side with the at least one material to be introduced into the discharge lamp, and in particular with two materials namely with a mercury alloy and getter. This has the advantage, among others, that the coating of the two materials on the substrate band can be done simultaneously.
DRAWINGS
The invention will now be described in conjunction with the drawing.
Shown are in:
FIG. 1, a ring cap for a discharge lamp of the prior art;
FIG. 2, a cap band of the prior art;
FIG. 3A, a sectional view of a first embodiment of a cap band, produced by the method of the invention, coated on both sides;
FIG. 3B, a top view of FIG. 3A;
FIG. 4A, a sectional view of a second embodiment of a cap band, produced by the method of the invention, coated on one side;
FIG. 4B, a top view of FIG. 4A; and
FIGS. 5 and 6, two exemplary embodimen
REFERENCES:
patent: 2515179 (1950-07-01), Barger
patent: 3525009 (1970-08-01), Someya et al.
patent: 3544829 (1970-12-01), Someya et al.
patent: 3549936 (1970-12-01), Hama et al.
patent: 3549937 (1970-12-01), Hanada et al.
patent: 3657589 (1972-04-01), Della Porta et al.
patent: 4461981 (1984-07-01), Saikatsu et al.
patent: 4706488 (1987-11-01), Williamson
patent: 4855643 (1989-08-01), White
Japanese Journal of Applied Physics, Suppl. 2, Pt. 1, pp. 45-48, Dec. 1974, . della Port et al, "Mercury Dispensing and Gettering in Fluorescent Lamps" .
Patel Ashok
Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
LandOfFree
Method for producing a cap band for discharge lamps does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for producing a cap band for discharge lamps, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing a cap band for discharge lamps will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-247759