GB804343A - Improvements in or relating to gas discharge lamp apparatus - Google Patents

Improvements in or relating to gas discharge lamp apparatus

Info

Publication number
GB804343A
GB804343A GB1438656A GB1438656A GB804343A GB 804343 A GB804343 A GB 804343A GB 1438656 A GB1438656 A GB 1438656A GB 1438656 A GB1438656 A GB 1438656A GB 804343 A GB804343 A GB 804343A
Authority
GB
United Kingdom
Prior art keywords
discharge
lamp
electrodes
main
choke
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
Application number
GB1438656A
Inventor
George Stanley Elphick
Ernest Roy Hurr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rank Cintel Ltd
Original Assignee
Rank Cintel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rank Cintel Ltd filed Critical Rank Cintel Ltd
Priority to GB1438656A priority Critical patent/GB804343A/en
Publication of GB804343A publication Critical patent/GB804343A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
    • H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
    • H05B41/22—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps having an auxiliary starting electrode

Abstract

804,343. Control systems for discharge apparatus. RANK CINTEL, Ltd. March 22, 1955 [March 23, 1954], No. 14386/56. Divided out of 804,342, [Group XL (a)] Class 38 (4). Flash discharge lamp apparatus includes a discharge lamp 13 having main electrodes 4 and 5 between which the main discharge passes in a capillary portion of the lamp envelope, and an auxiliary electrode 10 adjacent the main electrode 5, the arrangement being such that the auxiliary discharge is shielded from the capillary portion of the lamp envelope, means for applying to the main electrodes 4 and 5 voltage pulses of sufficient amplitude to produce a main discharge therebetween and means for maintaining between the main electrode 5 and the auxiliary electrode 10, during periods when the lamp may be required to fire, a small continuous electric discharge. The lamp is constructed as described in Specification 804,342. The small continuous discharge between the electrodes 5 and 10 is produced by the potential between the terminals + and 22 which may be unidirectional or alternating and is preferably applied through a resistor 23. The circuit is preferably arranged so that the potential between electrodes 5 and 10 is greater than that between electrodes 4 and 10 to prevent discharge between the latter electrodes. When lamp 13 is to be flashed ave voltage pulse is applied by way of terminals 19, 20 between grid and cathode of pentode valve 15 so that the valve is cut off to interrupt the flow of current through choke 14 and cause a high-voltage pulse across the choke which is applied to the main electrodes 4 and 5. One end of choke 14 is connected to electrode 4, which is earthed, through capacitor 18 and the other end of the choke is connected to the electrode 5 through a resistor 25 close to the anode of the valve 15 to reduce the generation of high-frequency oscillations. The screen grid of valve 15 is connected to the + ve terminal of the source by a resistor 16 and to the earthed - ve terminal by a capacitor 17. The suppressor grid of the valve is connected to the cathode. To prevent damage in the event of lamp 13 failing to strike or being disconnected, a safety spark gap 21 is connected across choke 14 in series with a resistor 24. Numerical characteristics of a typical circuit are stated.
GB1438656A 1954-03-23 1954-03-23 Improvements in or relating to gas discharge lamp apparatus Expired GB804343A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1438656A GB804343A (en) 1954-03-23 1954-03-23 Improvements in or relating to gas discharge lamp apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1438656A GB804343A (en) 1954-03-23 1954-03-23 Improvements in or relating to gas discharge lamp apparatus

Publications (1)

Publication Number Publication Date
GB804343A true GB804343A (en) 1958-11-12

Family

ID=10040254

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1438656A Expired GB804343A (en) 1954-03-23 1954-03-23 Improvements in or relating to gas discharge lamp apparatus

Country Status (1)

Country Link
GB (1) GB804343A (en)

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