CA1215100A - Low pressure discharge lamp - Google Patents
Low pressure discharge lampInfo
- Publication number
- CA1215100A CA1215100A CA000448623A CA448623A CA1215100A CA 1215100 A CA1215100 A CA 1215100A CA 000448623 A CA000448623 A CA 000448623A CA 448623 A CA448623 A CA 448623A CA 1215100 A CA1215100 A CA 1215100A
- Authority
- CA
- Canada
- Prior art keywords
- base plate
- glass tube
- glass
- electrodes
- discharge lamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The low pressure discharge lamp has at least one glass tube containing therein mercury and a rare gas and provided with a fluorescent layer on its inner wall and electrodes set up in a single base place in an air tight manner. Each end of the glass tube is bonded with an adhesive to the base plate such that each of the electrodes is received in an open end thereby to form a sealed space by the glass tube and the base plate. Two glass tubes are connected in series via through holes in the base plate. With the structure, damage to the glass tube in the sealing process is prevented and the structure of the lamp is made compact while manufacture of the lamp is simplified.
The low pressure discharge lamp has at least one glass tube containing therein mercury and a rare gas and provided with a fluorescent layer on its inner wall and electrodes set up in a single base place in an air tight manner. Each end of the glass tube is bonded with an adhesive to the base plate such that each of the electrodes is received in an open end thereby to form a sealed space by the glass tube and the base plate. Two glass tubes are connected in series via through holes in the base plate. With the structure, damage to the glass tube in the sealing process is prevented and the structure of the lamp is made compact while manufacture of the lamp is simplified.
Description
so The present invention relates to a low pressure disk charge lamp such as a fluorescent lamp. More particularly, it else to a low pressure discharge tamp having a curved glass tube making its structure compact.
The present invention will be illustrated by reference to -the accompanying drawings, in which:-inure 1 is a front view partly cross sectioned show-in the construction of the conventional U-shaped fluorescent lamp;
Figure 2 is a perspective view showing a fluorescent lamp formed by further bending the conventional U-shaped glass tube;
Figure 3 is a perspective view of a fluorescent lamp according to an embodiment of the present invention;
Figure 4 is an exploded view of Figure 3; and figure 5 is a perspective view of another embodiment of the fluorescent lamp according to the present invention.
Generally, a fluorescent tamp is so constructed that electrodes are disposed at both ends of a linear glass tube and luminescence is caused by an exciting gas contained in -the glass tube due to the electric discharge between the electrodes. The lumillescence efficiency increases as the distance between the electrodes, namely, the length of electric discharge path is increased. Accordingly, if luminescence efficiency is con-ridered to be important, the use of a longer glass tube is advantageous. However, discharge tamps are used as slight sources in a variety of positions and it may be desirable for users to have one having a compact structure which is con-lenient -to handle. Various proposals have thus been made for a discharge lamp with a curved glass tube so that luminescence efficiency is maintained at a high level to some extent while the size of the lamp is reduced by making its structure compact.
Figure 1 shows a U-shaped fluorescent lamp as a typic eel example of the discharge lamp of this -type in which at both ends of a U-shaped glass tube 1 on the inner wall of which a fluorescent layer I is former, glass stems 3 each holding an electrode 2 are provided in an air tight manner.
The fluorescent lamp having the construction described above is utilized in the field requiring a compact light source since such lamp imparts substantially the same luminescence characteristic as an ordinary fluorescent lamp using a linear glass tube although the length of -the lamp is one half.
However, the discharge lamp having the construction above-mentioned has the disadvantage that it is more comply-acted to manufacture it in comparison with the conventional discharge lamp using a linear glass tube. Particularly, it is difficult to attach a glass stem to the end portion of the glass tube 1 to seal it. Namely, a general method of seal-bonding a glass stem 3 to the end of the glass tube 1 is that the glass stem 3 is brought to contact with the end of the glass tube which is previously bent into a U-shape; heat is applied to the periphery of the contacting par-t by a gas burner (no-t shown) to soften glass thereby causing melt bonding of the glass -tube and the glass stem.
In the discharge lamp having the shape shown in Figure 1, however, since both parts to be sealed are disposed keynote-guzzle to each other, it is difficult to apply heat from the burner to those parts thereby possibly causing defects such as cracking during sealing operations. Further, the conventional discharge lamp is no-t always of sufficiently compact structure because the linear glass -tube is bent only once.
Figure 2 shows a fluorescent lamp of compact strut lure disclosed in Japanese Unexamined Publication 83147/1980 in which the fluorescent lamp has a base plate 23 to one surface of Jo which is integrally attached a lamp base 9 and the other surface of wtlich is firmly secured to a glass tube 1 as a luminescence tube. 'Lowe glass tube 1 is in a general saddle shape and is formed by bending a linear glass -tube at its intermediate port lion into a U-shape and further bending the U-shaped glass tube by 180 in the direction perpendicular to the axis of -the bending. The discharge lamp also provided, similarly to the conventional lamp, with glass stems 3 attached to both ends of the glass tube 1 and electrodes 2 held by the glass sterns 3.
in the discharge lamp having a doubly curved glass tube as above mentioned bending operations of the glass tube are more complicated because a shaped glass tube is further bent into double U-shapes. Furthermore, in the second bending operations, two portlorls in the glass tube are simultaneously bent- and accordingly, if there is a large curvature, defects may result in the glass tube. Therefore, there has been restriction ion compact structure of dischclrge lamps.
The proselyte inverlti.orl eliminates -the disadvantages of the corlventional discharcJe lalnp and provides a low pressure discharge lamp for preventing brealcing of the glass tube in the sealing process and making its manufacture easy, which comprises a base plate, electrodes attached to the base plate in an air tight manner and at least one glass tube both of whose open ends are adhesively bonded air-tightly -to the base plate both open ends receiving -therein the electrodes, to form a sealed space between the glass tube and -the base plate. Two glass tubes are connected in series via through holes in the base plate.
The present invention also provides a low pressure discharge lamp comprising a base plate provided with electron dyes and through holes and at least one glass tube, each open end of which is adhesively bonded -to the base plate such -that each of the electrodes is contained in an open end, certain open ends of the glass tube being connected to each other via the through holes of the base plate, whereby at least a second bending operation to form a U-shape of the glass tube is eliminated -thereby simplifying the manufacturing steps and providing a come pact construction of the lamp.
An embodiment of the present invention will be desk cried with reference to Figures 3 and 4.
In Figures 3 and 4, there is shown a circular ceramic base plate which is divided in-to two parts along a radial direct shunner i.e. a bottom part 12 and a cover part 13 covering the entirety of one surface of -the bottom part 12. An elliptical through hole 15 is formed in the half area of the bottom part 12 and two circular through holes, 14,14 are formed in the cover pat 13. The through holes 14,14 are above the elliptical hole 15 at the time of bonding the bottom part 12 and the cover part 13 with an adhesive such that a communication hole 8 having the through holes 14,14 as open ends is formed. Two electrodes 2 extending from a semi-circular area of the cover par-t 13 opposite an area where two -through holes 14,14 are formed and lead wires 16 to support the electrodes 2 pass out through the bottom part 12.
Two glass tubes 1 each bent in-to a U-shape and having open ends are attached to the base plate 23 so that respective one ends of the glass -tubes are air-tightly bonded with the adhesive 4 to the cover part 13 containing therein the elect trove 2 and the other ends are air-tightly bonded with the adhesive 4 to the cover part 13 around the periphery of the respective through holes 14 whereby these other ens commune-gate through the communication hole 8. A fluorescent layer 11 is coated on the inner wall of the glass tubes 1 which contain -therein specified amount of mercury and a rare gas such as argon gas. A base metal 9 is bonded to the base plate 23 with its I. - 4 -side surface bonded with an adhesive (not shown). Terminals 10 of a conductive material are attached to the bottom surface ox the base metal 9 to be electrically connected with the lead wires 16 supporting the electrodes 2.
In the fluorescent lamp having the construction above-mentioned, when a voltage is applied across the electrodes 2 through the terminals 10, there takes place an electric disk charge -through an electric path formed by: one of the electrodes
The present invention will be illustrated by reference to -the accompanying drawings, in which:-inure 1 is a front view partly cross sectioned show-in the construction of the conventional U-shaped fluorescent lamp;
Figure 2 is a perspective view showing a fluorescent lamp formed by further bending the conventional U-shaped glass tube;
Figure 3 is a perspective view of a fluorescent lamp according to an embodiment of the present invention;
Figure 4 is an exploded view of Figure 3; and figure 5 is a perspective view of another embodiment of the fluorescent lamp according to the present invention.
Generally, a fluorescent tamp is so constructed that electrodes are disposed at both ends of a linear glass tube and luminescence is caused by an exciting gas contained in -the glass tube due to the electric discharge between the electrodes. The lumillescence efficiency increases as the distance between the electrodes, namely, the length of electric discharge path is increased. Accordingly, if luminescence efficiency is con-ridered to be important, the use of a longer glass tube is advantageous. However, discharge tamps are used as slight sources in a variety of positions and it may be desirable for users to have one having a compact structure which is con-lenient -to handle. Various proposals have thus been made for a discharge lamp with a curved glass tube so that luminescence efficiency is maintained at a high level to some extent while the size of the lamp is reduced by making its structure compact.
Figure 1 shows a U-shaped fluorescent lamp as a typic eel example of the discharge lamp of this -type in which at both ends of a U-shaped glass tube 1 on the inner wall of which a fluorescent layer I is former, glass stems 3 each holding an electrode 2 are provided in an air tight manner.
The fluorescent lamp having the construction described above is utilized in the field requiring a compact light source since such lamp imparts substantially the same luminescence characteristic as an ordinary fluorescent lamp using a linear glass tube although the length of -the lamp is one half.
However, the discharge lamp having the construction above-mentioned has the disadvantage that it is more comply-acted to manufacture it in comparison with the conventional discharge lamp using a linear glass tube. Particularly, it is difficult to attach a glass stem to the end portion of the glass tube 1 to seal it. Namely, a general method of seal-bonding a glass stem 3 to the end of the glass tube 1 is that the glass stem 3 is brought to contact with the end of the glass tube which is previously bent into a U-shape; heat is applied to the periphery of the contacting par-t by a gas burner (no-t shown) to soften glass thereby causing melt bonding of the glass -tube and the glass stem.
In the discharge lamp having the shape shown in Figure 1, however, since both parts to be sealed are disposed keynote-guzzle to each other, it is difficult to apply heat from the burner to those parts thereby possibly causing defects such as cracking during sealing operations. Further, the conventional discharge lamp is no-t always of sufficiently compact structure because the linear glass -tube is bent only once.
Figure 2 shows a fluorescent lamp of compact strut lure disclosed in Japanese Unexamined Publication 83147/1980 in which the fluorescent lamp has a base plate 23 to one surface of Jo which is integrally attached a lamp base 9 and the other surface of wtlich is firmly secured to a glass tube 1 as a luminescence tube. 'Lowe glass tube 1 is in a general saddle shape and is formed by bending a linear glass -tube at its intermediate port lion into a U-shape and further bending the U-shaped glass tube by 180 in the direction perpendicular to the axis of -the bending. The discharge lamp also provided, similarly to the conventional lamp, with glass stems 3 attached to both ends of the glass tube 1 and electrodes 2 held by the glass sterns 3.
in the discharge lamp having a doubly curved glass tube as above mentioned bending operations of the glass tube are more complicated because a shaped glass tube is further bent into double U-shapes. Furthermore, in the second bending operations, two portlorls in the glass tube are simultaneously bent- and accordingly, if there is a large curvature, defects may result in the glass tube. Therefore, there has been restriction ion compact structure of dischclrge lamps.
The proselyte inverlti.orl eliminates -the disadvantages of the corlventional discharcJe lalnp and provides a low pressure discharge lamp for preventing brealcing of the glass tube in the sealing process and making its manufacture easy, which comprises a base plate, electrodes attached to the base plate in an air tight manner and at least one glass tube both of whose open ends are adhesively bonded air-tightly -to the base plate both open ends receiving -therein the electrodes, to form a sealed space between the glass tube and -the base plate. Two glass tubes are connected in series via through holes in the base plate.
The present invention also provides a low pressure discharge lamp comprising a base plate provided with electron dyes and through holes and at least one glass tube, each open end of which is adhesively bonded -to the base plate such -that each of the electrodes is contained in an open end, certain open ends of the glass tube being connected to each other via the through holes of the base plate, whereby at least a second bending operation to form a U-shape of the glass tube is eliminated -thereby simplifying the manufacturing steps and providing a come pact construction of the lamp.
An embodiment of the present invention will be desk cried with reference to Figures 3 and 4.
In Figures 3 and 4, there is shown a circular ceramic base plate which is divided in-to two parts along a radial direct shunner i.e. a bottom part 12 and a cover part 13 covering the entirety of one surface of -the bottom part 12. An elliptical through hole 15 is formed in the half area of the bottom part 12 and two circular through holes, 14,14 are formed in the cover pat 13. The through holes 14,14 are above the elliptical hole 15 at the time of bonding the bottom part 12 and the cover part 13 with an adhesive such that a communication hole 8 having the through holes 14,14 as open ends is formed. Two electrodes 2 extending from a semi-circular area of the cover par-t 13 opposite an area where two -through holes 14,14 are formed and lead wires 16 to support the electrodes 2 pass out through the bottom part 12.
Two glass tubes 1 each bent in-to a U-shape and having open ends are attached to the base plate 23 so that respective one ends of the glass -tubes are air-tightly bonded with the adhesive 4 to the cover part 13 containing therein the elect trove 2 and the other ends are air-tightly bonded with the adhesive 4 to the cover part 13 around the periphery of the respective through holes 14 whereby these other ens commune-gate through the communication hole 8. A fluorescent layer 11 is coated on the inner wall of the glass tubes 1 which contain -therein specified amount of mercury and a rare gas such as argon gas. A base metal 9 is bonded to the base plate 23 with its I. - 4 -side surface bonded with an adhesive (not shown). Terminals 10 of a conductive material are attached to the bottom surface ox the base metal 9 to be electrically connected with the lead wires 16 supporting the electrodes 2.
In the fluorescent lamp having the construction above-mentioned, when a voltage is applied across the electrodes 2 through the terminals 10, there takes place an electric disk charge -through an electric path formed by: one of the electrodes
2 - zone of the glass tubes lo communication hole 8 the other of the glass tubes 1 - the other of the electrodes 2.
In this way, it is easy to make a fluorescent lamp of the embodiment shown in Figures 3 and 4 since only one bending operation to the glass tube 1 is required to form a U-shape.
Furthermore, with the single bending structure, it is possible to give a large curvature to a portion to be bent so that both leg portions of the glass tube 1 are in a close juxtaposition.
also, even in use of two glass -tubes, this relationship is applicable. Accordingly, all the legs of the glass -tubes 1 can be gathered closely to the central axis of the base plate 23 whereby a further compact structure of the lamp is obtainable.
In the embodiment shown in Figures 3 and 4, -the base plate 23 is divided in its radial direction into two parts.
The present invention is not limited to this embodiment and it is possible that only upper portion of the base plate is divided at a position related at least to -the communication hole 15 or without dividing the base plate 23, a communication hole 8 is formed to provide openings at the side surface of -the base plate 23 as shown in Figure 5. In this case, if the electrodes 2 are provided at positions corresponding to each of the openings, a low pressure discharge lap making its manufacture easy and ox a fresh design can be obtained.
Further, when soda glass or lead glass is used for the glass tube 1, ceramics its suitable to the base plate 23. It is, however, possible to use the same glass material as -the glass tube 1.
In this way, it is easy to make a fluorescent lamp of the embodiment shown in Figures 3 and 4 since only one bending operation to the glass tube 1 is required to form a U-shape.
Furthermore, with the single bending structure, it is possible to give a large curvature to a portion to be bent so that both leg portions of the glass tube 1 are in a close juxtaposition.
also, even in use of two glass -tubes, this relationship is applicable. Accordingly, all the legs of the glass -tubes 1 can be gathered closely to the central axis of the base plate 23 whereby a further compact structure of the lamp is obtainable.
In the embodiment shown in Figures 3 and 4, -the base plate 23 is divided in its radial direction into two parts.
The present invention is not limited to this embodiment and it is possible that only upper portion of the base plate is divided at a position related at least to -the communication hole 15 or without dividing the base plate 23, a communication hole 8 is formed to provide openings at the side surface of -the base plate 23 as shown in Figure 5. In this case, if the electrodes 2 are provided at positions corresponding to each of the openings, a low pressure discharge lap making its manufacture easy and ox a fresh design can be obtained.
Further, when soda glass or lead glass is used for the glass tube 1, ceramics its suitable to the base plate 23. It is, however, possible to use the same glass material as -the glass tube 1.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A low pressure discharge lamp comprising a ceramic base plate, at least one pair of electrodes passing air-tightly through and extending from said base plate, and at least one bent glass tube which is coated on its inner wall with a fluorescent layer; contains mercury and a rare gas and has its both open ends in juxtaposition, each of open ends of said glass tube being air-tightly bonded to said base plate while receiving therein one of said electrodes, two glass tubes being connected in series via through holes in said base plate.
2. The low pressure discharge lamp according to claim 1, wherein said through holes in said base plate have their openings at the same side of the extension of said electrodes.
3. The low pressure discharge lamp according to claim 1 or 2, wherein said base plate is made of ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000448623A CA1215100A (en) | 1984-03-01 | 1984-03-01 | Low pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000448623A CA1215100A (en) | 1984-03-01 | 1984-03-01 | Low pressure discharge lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1215100A true CA1215100A (en) | 1986-12-09 |
Family
ID=4127314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000448623A Expired CA1215100A (en) | 1984-03-01 | 1984-03-01 | Low pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1215100A (en) |
-
1984
- 1984-03-01 CA CA000448623A patent/CA1215100A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |