US3729643A - Mercury vapor discharge lamp with radiation plane in envelope - Google Patents

Mercury vapor discharge lamp with radiation plane in envelope Download PDF

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Publication number
US3729643A
US3729643A US00128658A US3729643DA US3729643A US 3729643 A US3729643 A US 3729643A US 00128658 A US00128658 A US 00128658A US 3729643D A US3729643D A US 3729643DA US 3729643 A US3729643 A US 3729643A
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US
United States
Prior art keywords
envelope
mercury
flat portion
wall
radiation plane
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.)
Expired - Lifetime
Application number
US00128658A
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English (en)
Inventor
K Hosokoshi
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
Application granted granted Critical
Publication of US3729643A publication Critical patent/US3729643A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/33—Special shape of cross-section, e.g. for producing cool spot

Definitions

  • Light-source devices using superhigh-pressure mercury-vapor lamps have extensive applications as point sources oflight for projectors as well as for the exposure of photosensitive films, for example, in the manufacture of phosphor screens of color picture tubes, printed circuit substrates, etc.
  • the arc in the form of a columnar light-emitting part of each light source is desired to be as small in diameter as Also, it is noted that, in such a conventional device which makes use of an are produced in the hollow of a cylindrical quartz envelope containing the superhighpressure mercury-vapor lamp as the principal light source, the diameter of the arc column appears to be comparatively large. This is because the apparent inside diameter of the envelope looks larger than the actual dimension due to the refraction of light on the outer wall of the envelope.
  • the radiation surface is formed on a flat portion of the envelope as briefly mentioned above.
  • the apparent inside diameter of the envelope is equal to the actual dimension.
  • the apparent diameter of the arc column is smaller than those of conventional columns.
  • FIG. 1 is a side elevation view, partly broken away, of a light-source device using a conventional superhighpressure mercury-vapor lamp;
  • FIG. 2 is a section view taken on the line IIII of FIG. 1;
  • FIG. 3 is a section view of a superhigh-pressure mercury-vapor lamp embodying the present invention.
  • FIG. 4 is a graph comparing the luminance distribution characteristics of a lamp according to the invention and a conventional lamp.
  • a conventional light-source device of the nature described is constructed with a base I having sockets, a superhigh-pressure mercury-vapor lamp 2 supported by the base 1 generally parallel to the axis of the base, and a sealed envelope 3 of quartz for the lamp.
  • the envelope 3 is formed with a cylindrical portion 4 having an inside diameter d), and an outside diameter (b so that an arc column produced in the center hollow serves as a principal light source.
  • the apparent inside diameter 4 of the envelope 3 as viewed from either of the directlons indicated by arrows in FIG. 2 is larger than the actual inside diameter because of refraction of the light through the outer wall surface of the envelope 3. Accordingly the diameter of the arc column looks relatively large.
  • a mercury-vapor lamp according to this invention has a quartz envelope 13 which is formed with a flat portion 14 parallel to the axis P of the envelope 13 on the outer peripheral wall surface.
  • This flat portion 14 constitutes a radiation plane. Its width W is larger than the inside diameter d), and extends across the same.
  • the flat portion 14 is formed by cutting and grinding or otherwise machining the envelope of an ordinary superhigh-pressure mercury-vapor lamp. Alternatively, it may be formed simultaneously with the envelope 13.
  • the apparent inside diameter 4V which is viewed through the flat portion 14 is equal to the inside diameter Q5 Therefore, the apparent diameter of the arc column that is formed inside the envelope 13 is smaller than those of conventional superhighpressure mercury-vapor lamps.
  • reference letter a indicates an arc
  • reference letter D represents the extent of the flat portion.
  • the superhigh-pressure mercury-vapor lamp is mounted on the base in such a manner that the flat portion 14 serves as a radiation plane.
  • Its luminance distribution characteristic in percentage is compared in FIG. 4 with that of a conventional device. From the figure it can be seen that the former, represented by a curve A, is by far superior in centralizability to the latter represented by a curve B.
  • the center axis of ordinate C represents a straight line normal to the axis P of the envelope and which passes through the center of the envelope.
  • On the axis of abscissa is plotted the radial distance from the envelope.
  • a mercury-vapor discharge lamp including a light-transparent elongate envelope with an electrode sealed at each end, the improvement wherein said envelope comprises a completely cylindrical inner wall coaxial with the longitudinal axis of said envelope and an outer wall, said outer wall having a cylindrical portion coaxial with said longitudinal axis and a flat portion parallel to said axis, the radial thickness of said envelope at said flat portion being less than at said cylindrical portion, said flat portion serving as a radiation plane.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
US00128658A 1970-04-03 1971-03-29 Mercury vapor discharge lamp with radiation plane in envelope Expired - Lifetime US3729643A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45028735A JPS4946794B1 (de) 1970-04-03 1970-04-03

Publications (1)

Publication Number Publication Date
US3729643A true US3729643A (en) 1973-04-24

Family

ID=12256673

Family Applications (1)

Application Number Title Priority Date Filing Date
US00128658A Expired - Lifetime US3729643A (en) 1970-04-03 1971-03-29 Mercury vapor discharge lamp with radiation plane in envelope

Country Status (7)

Country Link
US (1) US3729643A (de)
JP (1) JPS4946794B1 (de)
CA (1) CA927901A (de)
DE (1) DE2116205C3 (de)
FR (1) FR2089110A5 (de)
GB (1) GB1314317A (de)
NL (2) NL150618B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101044589B (zh) * 2003-05-12 2010-11-17 皇家飞利浦电子股份有限公司 金属卤化物灯和车辆前灯

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115283U (de) * 1976-02-27 1977-09-01
JPS52129296U (de) * 1976-03-29 1977-10-01

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2020726A (en) * 1932-10-01 1935-11-12 Gen Electric Gaseous electric discharge device
US2241968A (en) * 1939-06-21 1941-05-13 Gen Electric Light source
US2445012A (en) * 1946-10-29 1948-07-13 Clarence H Van Orden Luminous electrical discharge device
US3293493A (en) * 1963-09-25 1966-12-20 Gen Electric Light source for color synthesis
US3442582A (en) * 1966-12-07 1969-05-06 Ibm Lamp arrangement for document scanning and modified lamp
US3457447A (en) * 1966-07-01 1969-07-22 Sylvania Electric Prod Apertured fluorescent lamp with lens along the aperture
US3593056A (en) * 1968-06-29 1971-07-13 Sony Corp Mercury-arc lamp

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2020726A (en) * 1932-10-01 1935-11-12 Gen Electric Gaseous electric discharge device
US2241968A (en) * 1939-06-21 1941-05-13 Gen Electric Light source
US2445012A (en) * 1946-10-29 1948-07-13 Clarence H Van Orden Luminous electrical discharge device
US3293493A (en) * 1963-09-25 1966-12-20 Gen Electric Light source for color synthesis
US3457447A (en) * 1966-07-01 1969-07-22 Sylvania Electric Prod Apertured fluorescent lamp with lens along the aperture
US3442582A (en) * 1966-12-07 1969-05-06 Ibm Lamp arrangement for document scanning and modified lamp
US3593056A (en) * 1968-06-29 1971-07-13 Sony Corp Mercury-arc lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101044589B (zh) * 2003-05-12 2010-11-17 皇家飞利浦电子股份有限公司 金属卤化物灯和车辆前灯

Also Published As

Publication number Publication date
DE2116205A1 (de) 1971-10-14
JPS4946794B1 (de) 1974-12-12
GB1314317A (en) 1973-04-18
NL7104482A (de) 1971-10-05
FR2089110A5 (de) 1972-01-07
NL150618B (nl) 1976-08-16
DE2116205B2 (de) 1977-12-15
DE2116205C3 (de) 1978-08-31
CA927901A (en) 1973-06-05
NL150618C (de)

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