CA1235453A - Rapid start fluorescent lamp with a bimetal electrode disconnect switch - Google Patents
Rapid start fluorescent lamp with a bimetal electrode disconnect switchInfo
- Publication number
- CA1235453A CA1235453A CA000465541A CA465541A CA1235453A CA 1235453 A CA1235453 A CA 1235453A CA 000465541 A CA000465541 A CA 000465541A CA 465541 A CA465541 A CA 465541A CA 1235453 A CA1235453 A CA 1235453A
- Authority
- CA
- Canada
- Prior art keywords
- electrode
- fluorescent lamp
- pair
- rapid start
- switch
- 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
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- Vessels And Coating Films For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
RAPID START FLUORESCENT LAMP WITH A BIMETAL ELECTRODE
DISCONNECT SWITCH
ABSTRACT
A rapid start fluorescent lamp having a glass envelope with a phosphor coated inner surface, a low pressure noble gas fill and an electrode at each end includes an electrode disconnect switch having a bimetal switch with a glass bottle and normally closed at room temperature and open at higher temperatures. The bottle is maintained at vacuum or is filled with a noble gas and the bimetal switch has a meltable bypass electrically conductive member shunted thereacross during manufacture of the lamp and removable thereafter.
DISCONNECT SWITCH
ABSTRACT
A rapid start fluorescent lamp having a glass envelope with a phosphor coated inner surface, a low pressure noble gas fill and an electrode at each end includes an electrode disconnect switch having a bimetal switch with a glass bottle and normally closed at room temperature and open at higher temperatures. The bottle is maintained at vacuum or is filled with a noble gas and the bimetal switch has a meltable bypass electrically conductive member shunted thereacross during manufacture of the lamp and removable thereafter.
Description
RAPID START FLUORESCENT LAMP WITH A BIMETAL ELECTRODE
DISCONNECT SWITCH
TECHNICAL FIELD
This invention relate to rapid tart fluorescent lamp and more particularly to rapid start fluorescent lamp having a bimetal electrode disconnect witch affixed to one electrode for discontinuing heater current flow upon effecting conductivity of the lamp.
BACKGROUND ART
In the fluorescent lamp art, both preheat type and rapid tart type fluorescent lamp are commonly encountered. It the preheat type of fluorescent lamp, heater current flows through the electrode only during lamp ignition whereupon an external voltage sensitize tarter opens the heaver current circuit and discontinues heater current flow. In contrast, the rapid tart fluorescent lamp normally has a constant heater current flow through each electrode both during ignition and operation of the lamp. Unfortunately, heater current flow during operation of thy rapid start fluorescent lamp it lost power which obviously reduces the operational efficiency of rapid tart fluorescent lamp.
Numerous suggestions have been made for enhancing efficiency of rapid tart fluoxe~cent lamp. For example, U.S. Patent No. 49052,687: 4,097,779; 4,114,g68: 4,156,B31 and 4,171,519, all afisigned to the Assignee of the prevent application, suggest numerous configurations for enhanced operation of rapid start fluorescent lamp. generally, 1~35~53 _ -2-each provides a thermally re6pon6ive circuit breaker suitable for use it discontinuing healer current upon operation of the fluorescent lamp.
However, it ha been found that problems till exist.
For example, it has been found that a problem occur whenever the thermally responsive circuit breaker extend in a direction parallel to the electrode of a lamp but for a distance greater than the length of the electrode.
Thereupon, positioning the lamp envelope properly it encumbered because the envelope tends to undesirably contact the circuit breaker when the circuit breaker and lamp electrodes are being inserted into the envelope. Such an encounter is obviou61y undesirable, and especially so in a high production manufacturing prows.
In another aspect, it has been found that positioning of the circuit breaker too close to the electrode ha a deleterious effect upon the life span of the fluorescent lamp More specifically, closely spacing the circuit breaker to an electrode generating heat tends to significantly reduce the life span of the fluorescent lamp wherein the electrode is located.
In still another aspect of the invention, it ha been found that the consistency and repeatability of operation of a circuit breaker disposed within a discharge lamp can be adversely affected when left unprotected from the environment within the dificharge lamp. In other words, a bimetal switch means placed nearby an activated electrode within a discharge lamp may be deleteriously affected when protection is not provided such that the bimetal switch surfaces are not isolated from the electrode discharge area.
D-83-1-150 1235~53 _ -3-OBJECTS AND SUMMARY OF THE INVENTION
An object of the present invention it to provide an enhanced rapid start fluorescent lamp. Another object of the invention it to improve the operating efficiency of a rapid start fluorescent lamp. Still another object of the invention it to improve the capabilities for manufacture of the above-described enhanced rapid start fluorescent lamp.
A further object of the invention it to reduce the energy reguirement6 during operational use of a rapid start fluorescent lamp.
These and other objects, advantages and capabilities are achieved in one aspect of the invention by a rapid start fluorescent lamp having an envelope with a phosphor-coated inner wall surface, a low pressure fill gay, an electrode within each end of the envelope and a pair of electrically conductive lead passing through each end of the envelope for coupling an electrode to an energizing source wherein an electrode disconnect switch ha a bimetal switch means normally closed a room temperature and open at a predetermined temperature higher than room temperature and spaced at least a millimeter from at least one of the electrode.
In another aspect of the invention, a rapid start fluorescent lamp has an electrode disconnect witch therein which include a bimetal switch means within a glue bottle with a pair of electrical conductors connecting the bimetal switch means to an electrode within the lamp and to an electrical lead passing through the discharge lamp to an energizing source.
... . . . . . .
D-83-1-150 ~.23S4~3 _ -4-- BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an elevation Al view, partly in section, of one end of a rapid start fluorescent lamp prior to processing;
FIG. 2 is an elevation Al vie, partly in section, of one end of a rapid tart fluorescent lamp of the invention:
and FIG. 3 is a chart illustrating the relative life of a 40-watt rapid start fluorescent lamp with regard to the average or mean distance of an electrode disconnect switch from the lamp electrode.
BEST MODE FOR CARRYING OUT THE INVENTION
For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following Delaware and appended claims in conjunction with the accompanying drawing.
Referring to FIGS. l and 2 of the drawings, a rapid tart 1uore~cent lamp suitable for processing includes an elongated glad envelope 5 having a coating 7 of phosphor on the inner wall surface of the envelope 5. A glass stem member g it sealed into the end of the envelope 5 and includes a pair ox electrical lead if and 13 sealed therein and pasting there through. An end cap 15 is telescoped over and attached to the end of the glass envelope 5 and includes a pair of pin 17 and lo electrically connected to a portion of the electLîcal leads if and 13 and formed to provide electrical connection to an external potential source (not shown). Moreover, the _ -5-envelope 5 has a gay fill therein selected from the group keynoting of argon, xenon, krypton, neon, helium and combinations thereof.
Within the envelope 5, an electrode 21 ha one end thereof connected to one of the electrical lead 13 and a longitudinal axis which extends in a direction substantially normal to the direction of the electrical lead 11 and 13. The electrode 21, which it often referred to a a heater or cathode, it I a well known type used in rapid tart fluorescent lamp and include a coating thereon which it usually on the form of alkaline earth oxides applied thereto in the form of carbonates which, upon processing, are converted to oxides.
The opposite end of the electrode 21 it connected to the other electrical lead 11 which it in turn, connected to the pin 17 by way of an electrode disconnect witch 23.
The electrical disconnect switch 23 is preferably in the form of a glass bottle 25 having a pair of electrical conductor 27 and 29 sealed into one end. A bimetal witch 31 it located within the glass bottle 25 and connected intermediate the electrical conductor 27 and 29. A
meltable bypa6fi member 33 it affixed to the conductors 27 and 29 in shunting relationship to the bimetal switch 31.
Moreover, a vacuum or a gas fill of noble gases or nitrogen ox combination thereon is contained within the glass bottle 25. Thus, electrical connection between the electrode 21 and the pin 17 it effected by way of the electrical lead 11, the electrical conductor 27 and 29 of the bimetal witch 23 and the bimetal witch 31 or the bypass member 33 as will be explained hereinafter.
Alternatively, the electrical disconnect witch 23 may be in the form of a bimetal witch 31 having either a substantially U-shaped or straight configuration which ~3~S3 D-83-1~150 _ . -6-would be located within the lamp envelope. Although a hermetically sealed glue bottle 25 having a gas fill it preferable, the witch 31 may have an insulating cover or -be disposed within bottle merely shielding the witch 31 from the electrode 21. Also, it it conceivable that the electrical disconnect witch 23 could be of a form wherein the electrical conductors 27 and 29 exit from opposite end of the gla6fi bottle 25.
As to manufacture, it it well known that the glass envelope 5 has the glad stem member 9 inserted therein and sealed thereto. Accordingly, it has been found most expedient to position the electrode disconnect witch 23 in a manner such that the switch 23 it located between and does not extend beyond a pair ox substantially parallel plane extending on a direction normal to the longitudinal axis of the electrode 21 and intercepting the end of the electrode 21 Thus, it ha been found that the electrode disconnect witch 23 it not normally disturbed when the envelope 5 it telescoped o'er the electrode 21 wince the disconnect White 23 doe not extend beyond a plane normal to the end of the electrode 21.
As to operation of the electrode disconnect witch 23, it it known that the previou~ly-mentioned alkali earth oxides on the electrode 21 are derived from a coating of carbonates during the manufacturing process. Normally, this prows it effected by applying current to the electrical leads 11 and 13 in an amount sufficient to raise the temperature of the electrode to about 1700 C.
However, the bimetal witch 31, which it normally cloyed at room temperature it a 40-watt lamp, tends to operate or open at a temperature I the range of about 140 to 180 C. Thea the process temperature employed to bake and Neal toe envelope 5 to the glue stem member 9 would D-83-1-150 1~3S~53 _ -7-tend to activate the bimetal witch 31. Moreover, current applied to the leads 11 and 13 would fail to effect the desired 1700 C. temperature of the electrode 21 for processing the carbonate thereon wince the bimetal witch 31 is operational and would interrupt the process.
In order to achieve this desired processing of the electrode 21 during manufacture, a beep member 33 of a refractory Metro ugh a molybdenum or stainless steel, it connected across the electrical conductors 27 and 29 of the electrical disconnect witch 23. This bypass member 33 it of a meltable material and in ripen to an electrical pulse potential, such as a pulse from a 270 micro farad capacitor charged to 300V DO is removed or melted away after processing he carbonates to provide the desired electrode disconnect switch 23 capability.
Additionally, it ha been found that the position of the electrode disconnect witch 23 with respect to the electrode 21 within the lamp envelope 5 it important.
Since rapid start fluorescent lamp may be of different I wattage and of a length of 3, 4, 6 or 8-feet for example, it ha been found that the electrode disconnect switch 23 should be fipaced a least one millimeter from the electrode 21. Also, the electrode disconnect switch 23 should be ox a material and configuration to operate at ~emperature6 in the range of about 75 C to 300 C depending upon the capacity of the lamp and the location of the disconnect switch 23 with respect Jo the electrode 21.
More specifically a it ha been found that a normal 4-foot, 40-watt fluorescent lamp preferably ha an electrode disconnect witch 23 such that the average spacing, X of FIG. 2, between the switch 23 and the electrode 21 it not lets than about 8.0 mm. and not more than about 14.0 mm. Moreover, the temperature necessary to ... ...... .........
-8- ~2~5~3 operate the electrode disconnect witch 23 in the above-mentioned White lamp is in the range of about 140 C to about 180 C.
Finally. it it to be noted that curve A of the comparison chart or a 40-watt rapid start fluorescent lamp of FIG. 3 provide a comparison of relative lamp life in percentage, with the average distance of the electrode disconnect switch 23 from the electrode 21. A aye readily be seen, the relative lamp life increases at a relatively rapid rate a the spacing between the disconnect switch 23 and electrode 21 increases. However, hi increased lamp life tend to level off at a spacing of about 8.0 mm.
Moreover, test indicate that a spacing between the switch 23 and electrode 21 of greater than about 14.0 mm. in a 40-watt rapid start fluorescent lamp create problems in achieving the desired temperatures consistent with proper operation of the disconnect switch 23.
Thus, there ha been provided a rapid tart fluorescent lamp which include an electrode disconnect switch having a I capability for effecting desired processing of an electrode as well as disconnection thereof during operational use of the lamp. Also, the electrode disconnect witch is positioned such that interference thereof with the joining of an envelope and stem member is not a problem and provision is made for removing the electrode heating capability during manufacture.
While there ha been shown and described what it at present considered the preferred embodiments of the invention, it will be obvious to those skilled in the art thaw various changes and modification may be made therein without departing from the invention a defined by the appended claims.
... .. ... ... ...
DISCONNECT SWITCH
TECHNICAL FIELD
This invention relate to rapid tart fluorescent lamp and more particularly to rapid start fluorescent lamp having a bimetal electrode disconnect witch affixed to one electrode for discontinuing heater current flow upon effecting conductivity of the lamp.
BACKGROUND ART
In the fluorescent lamp art, both preheat type and rapid tart type fluorescent lamp are commonly encountered. It the preheat type of fluorescent lamp, heater current flows through the electrode only during lamp ignition whereupon an external voltage sensitize tarter opens the heaver current circuit and discontinues heater current flow. In contrast, the rapid tart fluorescent lamp normally has a constant heater current flow through each electrode both during ignition and operation of the lamp. Unfortunately, heater current flow during operation of thy rapid start fluorescent lamp it lost power which obviously reduces the operational efficiency of rapid tart fluorescent lamp.
Numerous suggestions have been made for enhancing efficiency of rapid tart fluoxe~cent lamp. For example, U.S. Patent No. 49052,687: 4,097,779; 4,114,g68: 4,156,B31 and 4,171,519, all afisigned to the Assignee of the prevent application, suggest numerous configurations for enhanced operation of rapid start fluorescent lamp. generally, 1~35~53 _ -2-each provides a thermally re6pon6ive circuit breaker suitable for use it discontinuing healer current upon operation of the fluorescent lamp.
However, it ha been found that problems till exist.
For example, it has been found that a problem occur whenever the thermally responsive circuit breaker extend in a direction parallel to the electrode of a lamp but for a distance greater than the length of the electrode.
Thereupon, positioning the lamp envelope properly it encumbered because the envelope tends to undesirably contact the circuit breaker when the circuit breaker and lamp electrodes are being inserted into the envelope. Such an encounter is obviou61y undesirable, and especially so in a high production manufacturing prows.
In another aspect, it has been found that positioning of the circuit breaker too close to the electrode ha a deleterious effect upon the life span of the fluorescent lamp More specifically, closely spacing the circuit breaker to an electrode generating heat tends to significantly reduce the life span of the fluorescent lamp wherein the electrode is located.
In still another aspect of the invention, it ha been found that the consistency and repeatability of operation of a circuit breaker disposed within a discharge lamp can be adversely affected when left unprotected from the environment within the dificharge lamp. In other words, a bimetal switch means placed nearby an activated electrode within a discharge lamp may be deleteriously affected when protection is not provided such that the bimetal switch surfaces are not isolated from the electrode discharge area.
D-83-1-150 1235~53 _ -3-OBJECTS AND SUMMARY OF THE INVENTION
An object of the present invention it to provide an enhanced rapid start fluorescent lamp. Another object of the invention it to improve the operating efficiency of a rapid start fluorescent lamp. Still another object of the invention it to improve the capabilities for manufacture of the above-described enhanced rapid start fluorescent lamp.
A further object of the invention it to reduce the energy reguirement6 during operational use of a rapid start fluorescent lamp.
These and other objects, advantages and capabilities are achieved in one aspect of the invention by a rapid start fluorescent lamp having an envelope with a phosphor-coated inner wall surface, a low pressure fill gay, an electrode within each end of the envelope and a pair of electrically conductive lead passing through each end of the envelope for coupling an electrode to an energizing source wherein an electrode disconnect switch ha a bimetal switch means normally closed a room temperature and open at a predetermined temperature higher than room temperature and spaced at least a millimeter from at least one of the electrode.
In another aspect of the invention, a rapid start fluorescent lamp has an electrode disconnect witch therein which include a bimetal switch means within a glue bottle with a pair of electrical conductors connecting the bimetal switch means to an electrode within the lamp and to an electrical lead passing through the discharge lamp to an energizing source.
... . . . . . .
D-83-1-150 ~.23S4~3 _ -4-- BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an elevation Al view, partly in section, of one end of a rapid start fluorescent lamp prior to processing;
FIG. 2 is an elevation Al vie, partly in section, of one end of a rapid tart fluorescent lamp of the invention:
and FIG. 3 is a chart illustrating the relative life of a 40-watt rapid start fluorescent lamp with regard to the average or mean distance of an electrode disconnect switch from the lamp electrode.
BEST MODE FOR CARRYING OUT THE INVENTION
For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following Delaware and appended claims in conjunction with the accompanying drawing.
Referring to FIGS. l and 2 of the drawings, a rapid tart 1uore~cent lamp suitable for processing includes an elongated glad envelope 5 having a coating 7 of phosphor on the inner wall surface of the envelope 5. A glass stem member g it sealed into the end of the envelope 5 and includes a pair ox electrical lead if and 13 sealed therein and pasting there through. An end cap 15 is telescoped over and attached to the end of the glass envelope 5 and includes a pair of pin 17 and lo electrically connected to a portion of the electLîcal leads if and 13 and formed to provide electrical connection to an external potential source (not shown). Moreover, the _ -5-envelope 5 has a gay fill therein selected from the group keynoting of argon, xenon, krypton, neon, helium and combinations thereof.
Within the envelope 5, an electrode 21 ha one end thereof connected to one of the electrical lead 13 and a longitudinal axis which extends in a direction substantially normal to the direction of the electrical lead 11 and 13. The electrode 21, which it often referred to a a heater or cathode, it I a well known type used in rapid tart fluorescent lamp and include a coating thereon which it usually on the form of alkaline earth oxides applied thereto in the form of carbonates which, upon processing, are converted to oxides.
The opposite end of the electrode 21 it connected to the other electrical lead 11 which it in turn, connected to the pin 17 by way of an electrode disconnect witch 23.
The electrical disconnect switch 23 is preferably in the form of a glass bottle 25 having a pair of electrical conductor 27 and 29 sealed into one end. A bimetal witch 31 it located within the glass bottle 25 and connected intermediate the electrical conductor 27 and 29. A
meltable bypa6fi member 33 it affixed to the conductors 27 and 29 in shunting relationship to the bimetal switch 31.
Moreover, a vacuum or a gas fill of noble gases or nitrogen ox combination thereon is contained within the glass bottle 25. Thus, electrical connection between the electrode 21 and the pin 17 it effected by way of the electrical lead 11, the electrical conductor 27 and 29 of the bimetal witch 23 and the bimetal witch 31 or the bypass member 33 as will be explained hereinafter.
Alternatively, the electrical disconnect witch 23 may be in the form of a bimetal witch 31 having either a substantially U-shaped or straight configuration which ~3~S3 D-83-1~150 _ . -6-would be located within the lamp envelope. Although a hermetically sealed glue bottle 25 having a gas fill it preferable, the witch 31 may have an insulating cover or -be disposed within bottle merely shielding the witch 31 from the electrode 21. Also, it it conceivable that the electrical disconnect witch 23 could be of a form wherein the electrical conductors 27 and 29 exit from opposite end of the gla6fi bottle 25.
As to manufacture, it it well known that the glass envelope 5 has the glad stem member 9 inserted therein and sealed thereto. Accordingly, it has been found most expedient to position the electrode disconnect witch 23 in a manner such that the switch 23 it located between and does not extend beyond a pair ox substantially parallel plane extending on a direction normal to the longitudinal axis of the electrode 21 and intercepting the end of the electrode 21 Thus, it ha been found that the electrode disconnect witch 23 it not normally disturbed when the envelope 5 it telescoped o'er the electrode 21 wince the disconnect White 23 doe not extend beyond a plane normal to the end of the electrode 21.
As to operation of the electrode disconnect witch 23, it it known that the previou~ly-mentioned alkali earth oxides on the electrode 21 are derived from a coating of carbonates during the manufacturing process. Normally, this prows it effected by applying current to the electrical leads 11 and 13 in an amount sufficient to raise the temperature of the electrode to about 1700 C.
However, the bimetal witch 31, which it normally cloyed at room temperature it a 40-watt lamp, tends to operate or open at a temperature I the range of about 140 to 180 C. Thea the process temperature employed to bake and Neal toe envelope 5 to the glue stem member 9 would D-83-1-150 1~3S~53 _ -7-tend to activate the bimetal witch 31. Moreover, current applied to the leads 11 and 13 would fail to effect the desired 1700 C. temperature of the electrode 21 for processing the carbonate thereon wince the bimetal witch 31 is operational and would interrupt the process.
In order to achieve this desired processing of the electrode 21 during manufacture, a beep member 33 of a refractory Metro ugh a molybdenum or stainless steel, it connected across the electrical conductors 27 and 29 of the electrical disconnect witch 23. This bypass member 33 it of a meltable material and in ripen to an electrical pulse potential, such as a pulse from a 270 micro farad capacitor charged to 300V DO is removed or melted away after processing he carbonates to provide the desired electrode disconnect switch 23 capability.
Additionally, it ha been found that the position of the electrode disconnect witch 23 with respect to the electrode 21 within the lamp envelope 5 it important.
Since rapid start fluorescent lamp may be of different I wattage and of a length of 3, 4, 6 or 8-feet for example, it ha been found that the electrode disconnect switch 23 should be fipaced a least one millimeter from the electrode 21. Also, the electrode disconnect switch 23 should be ox a material and configuration to operate at ~emperature6 in the range of about 75 C to 300 C depending upon the capacity of the lamp and the location of the disconnect switch 23 with respect Jo the electrode 21.
More specifically a it ha been found that a normal 4-foot, 40-watt fluorescent lamp preferably ha an electrode disconnect witch 23 such that the average spacing, X of FIG. 2, between the switch 23 and the electrode 21 it not lets than about 8.0 mm. and not more than about 14.0 mm. Moreover, the temperature necessary to ... ...... .........
-8- ~2~5~3 operate the electrode disconnect witch 23 in the above-mentioned White lamp is in the range of about 140 C to about 180 C.
Finally. it it to be noted that curve A of the comparison chart or a 40-watt rapid start fluorescent lamp of FIG. 3 provide a comparison of relative lamp life in percentage, with the average distance of the electrode disconnect switch 23 from the electrode 21. A aye readily be seen, the relative lamp life increases at a relatively rapid rate a the spacing between the disconnect switch 23 and electrode 21 increases. However, hi increased lamp life tend to level off at a spacing of about 8.0 mm.
Moreover, test indicate that a spacing between the switch 23 and electrode 21 of greater than about 14.0 mm. in a 40-watt rapid start fluorescent lamp create problems in achieving the desired temperatures consistent with proper operation of the disconnect switch 23.
Thus, there ha been provided a rapid tart fluorescent lamp which include an electrode disconnect switch having a I capability for effecting desired processing of an electrode as well as disconnection thereof during operational use of the lamp. Also, the electrode disconnect witch is positioned such that interference thereof with the joining of an envelope and stem member is not a problem and provision is made for removing the electrode heating capability during manufacture.
While there ha been shown and described what it at present considered the preferred embodiments of the invention, it will be obvious to those skilled in the art thaw various changes and modification may be made therein without departing from the invention a defined by the appended claims.
... .. ... ... ...
Claims (13)
1. A rapid start fluorescent lamp having an envelope with a phosphor-coated inner wall surface, a low pressure fill gas, an electrode within each end of the envelope and a pair of electrically conductive leads passing through each end of said envelope for coupling each of said electrodes to an energization source, said fluorescent lamp characterized by the improvement wherein an electrode disconnect switch is affixed to at least one of said pair of electrical leads associated with at least one of said electrodes within said envelope, said electrode disconnect switch including a bimetal switch normally closed at room temperature and open at a predetermined temperature higher than room temperature and spaced at least 8.0 millimeters from said electrode and a pair of electrical conductors coupled to said bimetal switch, one of said pair of electrical conductors of said disconnect switch connected to one of said pair of electrically conductive leads of said lamp and the other of said pair of electrical conductors of said disconnect switch connected to said electrode with the other of said pair of electrically conductive leads of said lamp coupling said electrode to said energization source.
2. The rapid start fluorescent lamp of Claim 1 wherein said electrode disconnect switching is disposed within a glass bottle.
3. The rapid start fluorescent lamp of Claim 1 wherein said electrode disconnect switch is hermetically sealed within a glass bottle.
4. The rapid start fluorescent lamp of Claim 1 wherein said electrode disconnect switch is operable at a temperature in the range of about 75° C to 300° C.
5. The rapid start fluorescent lamp of Claim 1 wherein said bimetal switch is in the form of a substantially U-shaped bimetal switch.
6. The rapid start fluorescent lamp of Claim 1 wherein said electrode disconnect switch is disposed within a hermetically sealed bottle having a fill gas selected from the group consisting of nitrogen, the noble gases and combinations thereof.
7. The rapid start fluorescent lamp of Claim 1 wherein said electrode disconnect switch has an average spacing from said electrode of not less than about 8.0 mm.
and not more than about 14.0 mm.
and not more than about 14.0 mm.
8. The rapid start fluorescent lamp of Claim 1 wherein said electrode disconnect switch is operable at a temperature in the range of about 140° C to 180° C.
9. In a rapid start fluorescent lamp having a glass envelope with a phosphor coated inner wall surface, a fill gas and a pair of spaced electrodes disposed within the opposite ends of said glass envelope with a pair of electrically conductive leads passing through each end of said envelope for coupling said electrodes to an energization source, the improvement comprising at least one electrode disconnect switch disposed with said lamp and having an average spacing of at least 8.0 millimeters from one of said electrodes, said electrode disconnect switch having a bimetal switch means normally closed at room temperature and open at a predetermined temperature higher than room temperature with a pair of electrical conductors connected to said bimetal switch means, one of said pair of electrical conductors coupling said bimetal switch to said electrode and the other of said pair of electrical conductors coupling said bimetal switch to one of said electrically conductive leads of said lamp and said other electrically conductive lead coupling said electrode to said energization source.
10. The improvement of Claim 9 wherein said bimetal switch means is hermetically sealed within a glass bottle and operable at a temperature in the range of about 75° C
to 300° C.
to 300° C.
11. The improvement of Claim 9 wherein said bimetal switch means is hermetically sealed within a glass bottle having a fill gas therein selected from the group consisting of nitrogen, the noble gases and combinations thereof.
12. The improvement of Claim 9 wherein said bimetal switch means is hermetically sealed within a glass bottle and operable at an average spacing of about 8.0 to 14.0 mm. from said electrode.
13. The improvement of Claim 9 wherein said bimetal switch means is hermetically sealed within a glass bottle and operable at a temperature in the range of about 140° C
to 180° C.
to 180° C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US54607283A | 1983-10-27 | 1983-10-27 | |
| US546,072 | 1990-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1235453A true CA1235453A (en) | 1988-04-19 |
Family
ID=24178752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000465541A Expired CA1235453A (en) | 1983-10-27 | 1984-10-16 | Rapid start fluorescent lamp with a bimetal electrode disconnect switch |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS60112246A (en) |
| BR (1) | BR8402953A (en) |
| CA (1) | CA1235453A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4156831A (en) * | 1978-05-24 | 1979-05-29 | Gte Sylvania Incorporated | Fluorescent lamp having heater circuit disconnect device |
-
1984
- 1984-06-18 BR BR8402953A patent/BR8402953A/en not_active IP Right Cessation
- 1984-10-16 CA CA000465541A patent/CA1235453A/en not_active Expired
- 1984-10-26 JP JP22427384A patent/JPS60112246A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60112246A (en) | 1985-06-18 |
| BR8402953A (en) | 1985-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |