JPS5444372A - Lighting apparatus - Google Patents

Lighting apparatus

Info

Publication number
JPS5444372A
JPS5444372A JP11172677A JP11172677A JPS5444372A JP S5444372 A JPS5444372 A JP S5444372A JP 11172677 A JP11172677 A JP 11172677A JP 11172677 A JP11172677 A JP 11172677A JP S5444372 A JPS5444372 A JP S5444372A
Authority
JP
Japan
Prior art keywords
bulb
pitting
caused
film
central portion
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
JP11172677A
Other languages
Japanese (ja)
Inventor
Futoshi Okamoto
Makoto Toho
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 Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP11172677A priority Critical patent/JPS5444372A/en
Publication of JPS5444372A publication Critical patent/JPS5444372A/en
Pending legal-status Critical Current

Links

Landscapes

  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

PURPOSE: To prevent occurrence of "pitting" in the tubular body of fluorescent lamp, by air-cooling the central portion of a rapid-start type fluorescent lamp.
CONSTITUTION: In a rapid-start type fluorescent lamp, in which a transparent conductive film 2 principally made of tin oxide is formed on the inner surface of bulb 1 and fluorescent material 3 is coated on the film 2, the lowest temperature points where condensation of mercury is promoted is located at the portions 10 to 30 % bulb length from both ends of the bulb 1, and minute discharge is caused between the condensed mercury and said conductive film 2, ao that there is caused dark "pitting" 5 due to rupture, discoloration or other of the fluorescent material 3. In order to prevent such "pitting", cool air supplying ports 7 connected to air condioning duct 12 are opened at the central portion of lithting apparatus 6, and cool air is blown out downwards of the lighting apparatus 6 by the aid of covers 6a on both sides of the same, to forcibly cool the bulb 1. With such an arrangement, central portion of the bulb 1 is cooled effctively, so that any discharge is not caused between said film 2 and condensed mercury, if condensation of merucry is caused, since almost no potential difference between the film 2 and Hg gas. Thus, occurrence of pitting of the bulb 1 can be positively prevented
COPYRIGHT: (C)1979,JPO&Japio
JP11172677A 1977-09-14 1977-09-14 Lighting apparatus Pending JPS5444372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11172677A JPS5444372A (en) 1977-09-14 1977-09-14 Lighting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11172677A JPS5444372A (en) 1977-09-14 1977-09-14 Lighting apparatus

Publications (1)

Publication Number Publication Date
JPS5444372A true JPS5444372A (en) 1979-04-07

Family

ID=14568598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11172677A Pending JPS5444372A (en) 1977-09-14 1977-09-14 Lighting apparatus

Country Status (1)

Country Link
JP (1) JPS5444372A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6756723B2 (en) 1997-12-16 2004-06-29 Hitachi, Ltd. Fluorescent lamp, method for manufacturing the same, and fluorescent lamp device
US7164224B2 (en) 2000-12-14 2007-01-16 Sharp Kabushiki Kaisha Backlight having discharge tube, reflector and heat conduction member contacting discharge tube
JP2010186604A (en) * 2009-02-10 2010-08-26 Hitachi Lighting Ltd Fluorescent lamp

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6756723B2 (en) 1997-12-16 2004-06-29 Hitachi, Ltd. Fluorescent lamp, method for manufacturing the same, and fluorescent lamp device
US7164224B2 (en) 2000-12-14 2007-01-16 Sharp Kabushiki Kaisha Backlight having discharge tube, reflector and heat conduction member contacting discharge tube
US7169005B2 (en) 2000-12-14 2007-01-30 Sharp Kabushiki Kaisha Method of producing a backlight having a discharge tube containing mercury
US7309146B2 (en) 2000-12-14 2007-12-18 Sharp Kabushiki Kaisha Backlight having discharge tube, reflector and heat conduction member contacting discharge tube
US7541723B2 (en) 2000-12-14 2009-06-02 Sharp Kabushiki Kaisha Backlight having a polarization separating element
JP2010186604A (en) * 2009-02-10 2010-08-26 Hitachi Lighting Ltd Fluorescent lamp

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