GB1199535A

GB1199535A – Low-Pressure Sodium Vapour Discharge Lamp
– Google Patents

GB1199535A – Low-Pressure Sodium Vapour Discharge Lamp
– Google Patents
Low-Pressure Sodium Vapour Discharge Lamp

Info

Publication number
GB1199535A

GB1199535A
GB32169/68A
GB3216968A
GB1199535A
GB 1199535 A
GB1199535 A
GB 1199535A
GB 32169/68 A
GB32169/68 A
GB 32169/68A
GB 3216968 A
GB3216968 A
GB 3216968A
GB 1199535 A
GB1199535 A
GB 1199535A
Authority
GB
United Kingdom
Prior art keywords
protuberance
lamp
sodium
discharge tube
orifice
Prior art date
1967-07-10
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
GB32169/68A
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.)

Philips Electronics UK Ltd

Original Assignee
Philips Electronic and Associated Industries 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.)
1967-07-10
Filing date
1968-07-05
Publication date
1970-07-22

1968-07-05
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd

1970-07-22
Publication of GB1199535A
publication
Critical
patent/GB1199535A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H01—ELECTRIC ELEMENTS

H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS

H01J61/00—Gas-discharge or vapour-discharge lamps

H01J61/02—Details

H01J61/24—Means for obtaining or maintaining the desired pressure within the vessel

H—ELECTRICITY

H01—ELECTRIC ELEMENTS

H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS

H01J61/00—Gas-discharge or vapour-discharge lamps

H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium Abstract 1,199,535. Metal-vapour lamps. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 July, 1968 [10 July, 1967], No. 32169/68. Heading H1D. In a low-pressure sodium-vapour discharge lamp containing sodium not in vapour form in the operating condition of the lamp, and having the discharge tube mounted within an outer envelope exhausted to 10-3 torr or below, substantially the whole of the non-vapourized sodium is contained in an appendage which lies entirely outside of, but opens into, the discharge space, the condition V > 0À5A#A being satisfied, where V is the volume of the protuberance in cm3 and A is the area, in cm2, of the orifice between the protuberance and the discharge space; the appendage is disposed in the vicinity of an electrode of the lamp, is heated only by heat evolved in the lamp, and has no conductive connection to an electrode of the lamp in the inoperative condition. As shown, Fig. 6, the sodium may be contained in a re-entrant portion 54 of the discharge tube 51, the closed end of the protuberance being adjacent, and heated by, the electrode 53. In the embodiment of Fig. 4, in which the outer envelope is not shown, the protuberance 23 is so twisted with respect to the plane p which passes through both the axis of the discharge tube and the orifice 24 of the protuberance, that for any orientation of the lamp, a portion of the protuberance lies below the level of the orifice, whereby to ensure that the enclosed sodium, liquid under operating condition, is prevented from flowing into the discharge space. In further embodiments the protuberance communicates with one limb of a U-shaped discharge tube (Figs. 1 to 3, not shown), and may be in the form of a sodium container connected to the discharge tube by a supply tube (Fig. 5, not shown). The lamp may be manufactured by sealing the protuberance, containing the whole of the sodium required for the lamp filling, to the discharge tube such that it communicates with the latter via an orifice, and heating the protuberance.

GB32169/68A
1967-07-10
1968-07-05
Low-Pressure Sodium Vapour Discharge Lamp

Expired

GB1199535A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

NL6709573A

NL6709573A
(en)

1967-07-10
1967-07-10

Publications (1)

Publication Number
Publication Date

GB1199535A
true

GB1199535A
(en)

1970-07-22

Family
ID=19800674
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB32169/68A
Expired

GB1199535A
(en)

1967-07-10
1968-07-05
Low-Pressure Sodium Vapour Discharge Lamp

Country Status (8)

Country
Link

US
(1)

US3548240A
(en)

AT
(1)

AT280419B
(en)

BE
(1)

BE717798A
(en)

CH
(1)

CH485319A
(en)

ES
(1)

ES355868A1
(en)

FR
(1)

FR1572848A
(en)

GB
(1)

GB1199535A
(en)

NL
(1)

NL6709573A
(en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3784863A
(en)

*

1973-01-11
1974-01-08
Thorn Electrical Ind Ltd
Vapour discharge lamps

NL7906203A
(en)

*

1979-08-15
1981-02-17
Philips Nv

LOW-PRESSURE MERCURY DISCHARGE LAMP.

US4835442A
(en)

*

1987-01-29
1989-05-30
Kabushiki Kaisha Toshiba
Lamp for generating ultraviolet radiation

WO2016135008A1
(en)

*

2015-02-26
2016-09-01
Philips Lighting Holding B.V.
Lighting device with dispenser for a reactive substance

Family Cites Families (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US2103039A
(en)

*

1929-07-10
1937-12-21
Gen Electric
Gaseous electric discharge device

DE684934C
(en)

*

1936-12-05
1939-12-08
Quarzlampen Gmbh

Electric metal vapor arc lamp with fixed electrodes activated to high levels of electron emission and a storage container for the metal to be evaporated

US3331977A
(en)

*

1965-03-15
1967-07-18
Westinghouse Electric Corp
High output discharge lamp with vapor pressure control means

1967

1967-07-10
NL
NL6709573A
patent/NL6709573A/xx
unknown

1968

1968-06-25
US
US739830A
patent/US3548240A/en
not_active
Expired – Lifetime

1968-07-05
GB
GB32169/68A
patent/GB1199535A/en
not_active
Expired

1968-07-08
CH
CH1016968A
patent/CH485319A/en
not_active
IP Right Cessation

1968-07-08
BE
BE717798D
patent/BE717798A/xx
unknown

1968-07-08
AT
AT654968A
patent/AT280419B/en
not_active
IP Right Cessation

1968-07-08
ES
ES355868A
patent/ES355868A1/en
not_active
Expired

1968-07-10
FR
FR1572848D
patent/FR1572848A/fr
not_active
Expired

Also Published As

Publication number
Publication date

DE1764615A1
(en)

1971-09-09

US3548240A
(en)

1970-12-15

NL6709573A
(en)

1969-01-14

AT280419B
(en)

1970-04-10

CH485319A
(en)

1970-01-31

BE717798A
(en)

1969-01-08

FR1572848A
(en)

1969-06-27

DE1764615B2
(en)

1976-07-29

ES355868A1
(en)

1970-03-16

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(en)

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Legal Events

Date
Code
Title
Description

1970-12-02
PS
Patent sealed [section 19, patents act 1949]

1978-02-01
PLNP
Patent lapsed through nonpayment of renewal fees

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