JPS57176644A - Manufacture of fluorescent lamp - Google Patents

Manufacture of fluorescent lamp

Info

Publication number
JPS57176644A
JPS57176644A JP6146181A JP6146181A JPS57176644A JP S57176644 A JPS57176644 A JP S57176644A JP 6146181 A JP6146181 A JP 6146181A JP 6146181 A JP6146181 A JP 6146181A JP S57176644 A JPS57176644 A JP S57176644A
Authority
JP
Japan
Prior art keywords
bulb
glass bulb
black spot
air
lamp
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
JP6146181A
Other languages
Japanese (ja)
Inventor
Michihisa Saito
Hiroshi Watabe
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6146181A priority Critical patent/JPS57176644A/en
Publication of JPS57176644A publication Critical patent/JPS57176644A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/42—Measurement or testing during manufacture

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

PURPOSE:To estimate the amount of mercury charged in a glass bulb by cooling the glass bulb locally, during the manufacturing process, by spraying air so as to produce a black spot at a voluntary position, and reading the size, the degree of absorbance, or both the size and the degree of absorbance of the black spot. CONSTITUTION:During an exhaustion process or other process following after mercury is dropped into a lamp bulb, the surface of a glass bulb 1 for a fluorescent lamp is locally cooled by spraying air with a temperature lower than that of the wall of the glass bulb 1, such as air with room temperature, by means of an air spraying equipment 3. As the result, part of mercuric vapor filling the lamp bulb 1 is condensed on a local part of the inner wall of the glass bulb 1 so as to form a black spot 2. Thus formed black spot 2 can be visually recognized from the outside of the bulb 1, and can be satisfactorily read optically.
JP6146181A 1981-04-24 1981-04-24 Manufacture of fluorescent lamp Pending JPS57176644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6146181A JPS57176644A (en) 1981-04-24 1981-04-24 Manufacture of fluorescent lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6146181A JPS57176644A (en) 1981-04-24 1981-04-24 Manufacture of fluorescent lamp

Publications (1)

Publication Number Publication Date
JPS57176644A true JPS57176644A (en) 1982-10-30

Family

ID=13171689

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6146181A Pending JPS57176644A (en) 1981-04-24 1981-04-24 Manufacture of fluorescent lamp

Country Status (1)

Country Link
JP (1) JPS57176644A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61232532A (en) * 1985-04-08 1986-10-16 Hitachi Ltd Manufacture of fluorescent lamp
JPS6348728A (en) * 1986-08-15 1988-03-01 Hitachi Ltd Manufacture fo circular fluorescent lamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61232532A (en) * 1985-04-08 1986-10-16 Hitachi Ltd Manufacture of fluorescent lamp
JPS6348728A (en) * 1986-08-15 1988-03-01 Hitachi Ltd Manufacture fo circular fluorescent lamp

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