JPS5765662A - Metal halide lamp - Google Patents

Metal halide lamp

Info

Publication number
JPS5765662A
JPS5765662A JP14102280A JP14102280A JPS5765662A JP S5765662 A JPS5765662 A JP S5765662A JP 14102280 A JP14102280 A JP 14102280A JP 14102280 A JP14102280 A JP 14102280A JP S5765662 A JPS5765662 A JP S5765662A
Authority
JP
Japan
Prior art keywords
coil
electrode
metal halide
layer
layers
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.)
Granted
Application number
JP14102280A
Other languages
Japanese (ja)
Other versions
JPH0117223B2 (en
Inventor
Toshihiko Ishigami
Hiromoto Sasaki
Akihiro Inoue
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14102280A priority Critical patent/JPS5765662A/en
Publication of JPS5765662A publication Critical patent/JPS5765662A/en
Publication of JPH0117223B2 publication Critical patent/JPH0117223B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode

Landscapes

  • Discharge Lamp (AREA)

Abstract

PURPOSE:To promote transfer to an arc discharge and improve the starting performance by winding three layers of electrode coil around an electrode shaft of a main electrode in a light emission tube such that the first layer is rough while the second and third layers have predetermined coil length. CONSTITUTION:In a metal halide light emission tube encapsulated with mercury, metal halide and starting rare gas, electrode oil 7 is wound in three layers around the electrode shaft 6 of a main electrode provided in said tube. The first layer coil 7a is rough winding, while the coil length L of the second layer coil 7b and the coil length 1 of the third layer coil 7c are arranged to satisfy the relation 0.3<=(l/6L)<= 0.8. With such structure the glow discharge will occur at the top G of the coil 2b and the heat at the top G is prevented from radiating to the electrode shaft 6 and the discharge space by the coils 2a, 2c. Since the temperature rise at the top G is quickened, the transfer to the arc discharge is quickened resulting in the improvement of the starting performance.
JP14102280A 1980-10-08 1980-10-08 Metal halide lamp Granted JPS5765662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14102280A JPS5765662A (en) 1980-10-08 1980-10-08 Metal halide lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14102280A JPS5765662A (en) 1980-10-08 1980-10-08 Metal halide lamp

Publications (2)

Publication Number Publication Date
JPS5765662A true JPS5765662A (en) 1982-04-21
JPH0117223B2 JPH0117223B2 (en) 1989-03-29

Family

ID=15282377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14102280A Granted JPS5765662A (en) 1980-10-08 1980-10-08 Metal halide lamp

Country Status (1)

Country Link
JP (1) JPS5765662A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009043452A (en) * 2007-08-06 2009-02-26 Seiko Epson Corp Arc tube, light source device and projector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009043452A (en) * 2007-08-06 2009-02-26 Seiko Epson Corp Arc tube, light source device and projector

Also Published As

Publication number Publication date
JPH0117223B2 (en) 1989-03-29

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