JPS5471880A - High-pressure sodium vapor lamp - Google Patents

High-pressure sodium vapor lamp

Info

Publication number
JPS5471880A
JPS5471880A JP13932977A JP13932977A JPS5471880A JP S5471880 A JPS5471880 A JP S5471880A JP 13932977 A JP13932977 A JP 13932977A JP 13932977 A JP13932977 A JP 13932977A JP S5471880 A JPS5471880 A JP S5471880A
Authority
JP
Japan
Prior art keywords
lamp
electrodes
alumina
pressure sodium
sodium vapor
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.)
Pending
Application number
JP13932977A
Other languages
Japanese (ja)
Inventor
Naoki Saito
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
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 Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Priority to JP13932977A priority Critical patent/JPS5471880A/en
Publication of JPS5471880A publication Critical patent/JPS5471880A/en
Pending legal-status Critical Current

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  • Discharge Lamp (AREA)

Abstract

PURPOSE: To provide a high-pressure sodium vapor lamp, which is designed such that top of electrodes is shaped in a conical form pointed with a suitable angle, and the portion of core rod of the electrodes projected from electrode coil is selected suitabley, such that it is enabled to prevent voltage rise of the lamp due to vibration and thus to prevent unexpected extinguishing of the lamp.
CONSTITUTION: Electrodes 6, 7 of light emitting tube 1 are protruded outward from the top of respective electrode coil 9, and they have an electrode rod 8 shaped at its top in a conical form. It was found from experiments that voltage rise of the lamp is small when the angle θ at the top of the cone is 30°W90° and ratio of protrusion length (l) to the diamether ϕ of core rod 8 is 1.8W2.7. In the above arrangement, light emitting tube 1 made of polycrystalline alumina or monocrystalline alumina is sealed at its opposite end portions with cement by means of end caps 2, 3 which are made of polycrystalline alumina ceramics or monocrystalline alumina.
COPYRIGHT: (C)1979,JPO&Japio
JP13932977A 1977-11-18 1977-11-18 High-pressure sodium vapor lamp Pending JPS5471880A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13932977A JPS5471880A (en) 1977-11-18 1977-11-18 High-pressure sodium vapor lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13932977A JPS5471880A (en) 1977-11-18 1977-11-18 High-pressure sodium vapor lamp

Publications (1)

Publication Number Publication Date
JPS5471880A true JPS5471880A (en) 1979-06-08

Family

ID=15242770

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13932977A Pending JPS5471880A (en) 1977-11-18 1977-11-18 High-pressure sodium vapor lamp

Country Status (1)

Country Link
JP (1) JPS5471880A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5035356A (en) * 1973-06-07 1975-04-04

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5035356A (en) * 1973-06-07 1975-04-04

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