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EP0110645B1 - Photodrucklampen - Google Patents

Photodrucklampen Download PDF

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Publication number
EP0110645B1
EP0110645B1 EP19830307089 EP83307089A EP0110645B1 EP 0110645 B1 EP0110645 B1 EP 0110645B1 EP 19830307089 EP19830307089 EP 19830307089 EP 83307089 A EP83307089 A EP 83307089A EP 0110645 B1 EP0110645 B1 EP 0110645B1
Authority
EP
European Patent Office
Prior art keywords
arc tube
volume
lamp
per
reflector
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
Application number
EP19830307089
Other languages
English (en)
French (fr)
Other versions
EP0110645A2 (de
EP0110645A3 (en
Inventor
Robert Brian Page
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.)
EMI Group Ltd
Original Assignee
Thorn EMI PLC
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 Thorn EMI PLC filed Critical Thorn EMI PLC
Publication of EP0110645A2 publication Critical patent/EP0110645A2/de
Publication of EP0110645A3 publication Critical patent/EP0110645A3/en
Application granted granted Critical
Publication of EP0110645B1 publication Critical patent/EP0110645B1/de
Expired 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
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent

Definitions

  • This invention relates to discharge lamps, primarily but not exclusively for the photoprinting industry.
  • diazo diazo
  • photopolymer printing plates which are then used to transfer ink to the printing paper.
  • the former diazo
  • the latter requires a lamp having a spectral energy distribution which peaks at approximately 420 nm while the latter material requires a lamp having a spectral energy distribution peaking at approximately 380 nm.
  • these different requirements are met by two different lamps each with a fill designed to produce radiation of the desired wavelength.
  • a lamp with a fill of 1.3 mg of gallium tri iodide would be used for diazo prints while a lamp with a fill of 2.5 mg of iron iodide would be used for the polymer material, each lamp of course would have the necessary fill of mercury.
  • Metal halide lamps having in addition to mercury, a mixture of gallium and ferric iodide are disclosed in the article "A metal halide lamp using both gallium and ferric iodides" by Shunji Kondoh, Lighting Research Laboratory, Lamp and Lighting Division, Storage Battery Co., Kyoto, Japan.
  • the lamps disclosed therein are restricted to linear tubular lamps of 1000-5000 watts and arc lengths of between 98 to 200 mm. These lamps require some kind of cooling system because of the heat generated.
  • the present invention embraces a discharge arc tube having a basic fill of mercury plus between 0.025 to 1.0 mg Gal3 per cm 3 of the arc tube volume and between 0.1 to 1.0 mg of Fel 2 per cm 3 of the arc tube volume.
  • an arc tube of quartz material suitable for a sealed beam reflector photoprinting lamp including spaced electrodes to sustain a discharge therebetween and a fill comprising
  • a sealed beam reflector lamp for photoprinting comprising, in combination, a reflector including a dichroic or aluminised layer selected to reflect ultra violet radiation and an arc tube of quartz material, the arc tube including spaced electrodes to sustain a discharge therebetween and a fill comprising
  • the outer jacket By providing the outer jacket with a dichroic layer on the inner rear surface thereof and positioning the discharge arc tube near the focus of the reflector, radiation can be diffused through the prismatic window at the front of the reflector and a substantially uniform directionally controlled beam of light is produced.
  • the dichroic layer reflects UV radiation and provides for heat dispersal.
  • the glass outer jacket affords a high degree of protection from short wave UV radiation.
  • the geometry of the discharge arc tube with an electrode length of approximately 25 mm or less and a diameter of 26 mm allows a high wall loading and a hot restart facility. If a hot re-start facility is not required then an aluminised reflector may be substituted for the dichroic layer. This feature combined with a fast run up facility avoids the need to simmer at a reduced power thus achieving reduced running costs when compared with conventional linear sources for photoprinting.
  • the reference numeral 10 denotes generally a 800 watt sealed beam reflector lamp combination according to the present invention comprising a reflector 11 containing a metal halide quartz discharge arc tube 12.
  • a prismatic lens 13 is sealed to the reflector 11 providing a front window and a dichroic layer 14 is formed on the rear inner surface of the reflector 11.
  • the dichroic layer is selected to reflect UV rather than visible light.
  • the discharge arc tube 12 is shown in more detail in Figure 2.
  • the discharge arc tube 12 is disposed adjacent the focus of the reflector 11 and is carried on nickel alloy inner lead in members 15 and 16 joined to outer lead in members 17 and 18 formed of copper braid.
  • a ceramic bridge member 19 maintains the electrically conducting pins 20 and 21 at the correct spacing. This is a standard G38 bi-pin construction providing a hot restart facility.
  • the discharge arc tube 12 is shown in more detail. It is seen to comprise a quartz envelope 22 of approximately 10 cm 3 internal volume having a fill 23 selected from a mixture of iron iodide (Fel 2 ), Gallium Tri iodide (Gal3) and mercury (Hg). Tungsten electrode coils 24, 25 are carried on tungsten shanks 26, 27 which are joined respectively to inner molybdenum foils 28 and 29. Outer molybdenum lead-in members 30, 31 are also joined to the foils 28, 29 and hermetically sealed in the pinches 32, 33. A typical electrode length between the electrodes 24 and 25 would be 25 mm with an overall length over the pinch seals of 78 mm while the maximum envelope nominal diameter would be 26 mm. Such an arc tube 12 would then be suitable for a metal halide discharge lamp.
  • a quartz envelope 22 of approximately 10 cm 3 internal volume having a fill 23 selected from a mixture of iron iodide (Fel 2 ), Gallium Tri iodide (Gal3) and mercury (
  • FIG. 3 there is shown a graph of a Fel 2 -Gal 3 -Hg system according to the invention which indicates a peak irradiance at the particular total iodide dose of 2.5 mg Fel 2 +0.5 mg Gal 3 +50 mg Hg in an approximately 10 cm 3 volume arc tube.
  • Other values of relative irradiance at difference dosage rates are given in the following Tables 1 and 2 where all values refer to arc tubes of approximately 10 cm 3 volume.
  • lamps having arc tubes of approximately 10 cm 3 volume with a fill of 2.5 mg Fel 2 plus 0.5 mg Gal3 and 65 mg Hg instead of 50 mg were tested and found to have an average irradiance of between 46.2 and 48.5 W/M 2 .
  • fills suitable for approximately 10 cm 3 arc tubes comprise a) 0.5 to 0.55 mg Gal3 plus 2.45 to 2.65 mg Fel 2 and 60 to 65 mg Hg and b) 0.5 mg Gal3 plus 2.5 mg Fel 2 and a quantity of mercury selected from between 50 to 65 mg.

Landscapes

  • Discharge Lamp (AREA)

Claims (7)

1. Bogenentladungsröhre aus Quarzmaterial, die für eine Reflektor-Fotodrucklampe mit gerichteter Strahlung geeignet ist, wobei die Bogenentladungsröhre im Abstand von einander angeordnete Elektroden einschließt, um zwischen diesen eine Ladung aufrechtzuerhalten, und eine Füllung, die umfaßt
zwischen 0.025 bis 1.0 mg Gal3 pro cm3 des Bogenentladungsröhre-Volumens,
zwischen 0.1 bis 1.0 mg Fel2 pro cm3 des Bogenentladungsröhren-Volumens, und
zwischen 2.5 bis 6.5 mg Hg pro cm3 des Bogenentladungsröhren-Volumens.
2. Bogenentladungsröhre nach Anspruch 1, bei der die Füllung 0.5 bis 0.55 mg Gal3 plus 2.45 bis 2.65 mg Fel2 plus 60 bis 65 mg Hg umfaßt und die Bogenentladungsröhre ein inneres Volumen von etwa 10 cm3 hat.
3. Bogenentladungsröhre nach Anspruch 1, bei der die Füllung 0.5 mg Gal3 plus 2.5 mg Fel2 und 50 bis 65 mg an Hg umfaßt und die Bogenentladungsröhre ein inneres Volumen von etwa 10 cm3 hat.
4. Bogenentladungsröhre nach Anspruch 3, bei der der Quecksilbergehalt 50 mg ist.
5. Bogenentladungsröhre nach einem der vorhergehenden Ansprüche, bei der der Abstand zwischen den Elektroden etwa 25 mm oder weniger und der innere Durchmesser der Bogenentladungsröhre 26 mm ist.
6. Reflektorlampe mit gerichteter Strahlung für fotografischen Druck, wobei die Lampe in Kombination einen Reflektor mit einer dichroitischen oder aluminisierten Schicht, die ausgewählt ist, um ultraviolette Strahlung zu reflektieren und eine Bogenentladungsröhre nach einem der Ansprüche 1 bis 5 umfaßt.
7. Reflektorlampe mit gerichteter Strahlung nach Anspruch 6, bei der die genannte Bogenentladungsröhre benachbart dem primären Brennpunkt des Reflektors angeordnet ist.
EP19830307089 1982-11-30 1983-11-21 Photodrucklampen Expired EP0110645B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8234089 1982-11-30
GB8234089 1982-11-30

Publications (3)

Publication Number Publication Date
EP0110645A2 EP0110645A2 (de) 1984-06-13
EP0110645A3 EP0110645A3 (en) 1985-05-29
EP0110645B1 true EP0110645B1 (de) 1988-06-01

Family

ID=10534624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830307089 Expired EP0110645B1 (de) 1982-11-30 1983-11-21 Photodrucklampen

Country Status (3)

Country Link
EP (1) EP0110645B1 (de)
DE (1) DE3376922D1 (de)
DK (1) DK548283A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3568512D1 (en) * 1984-04-19 1989-04-06 Gen Electric Reflector lamp and lighting systems particularly suitable for architectural lighting
NL191812C (nl) * 1987-09-04 1996-08-02 Philips Electronics Nv Hogedrukgasontladingslamp en armatuur voorzien van die lamp.
GB8725913D0 (en) * 1987-11-05 1987-12-09 Emi Plc Thorn Plant growth lamps
GB9607129D0 (en) * 1996-04-04 1996-06-12 Gew Ec Ltd Uv dryer with improved reflector

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2110663A5 (de) * 1970-10-26 1972-06-02 Aquitaine Total Organico
GB1397034A (en) * 1973-07-05 1975-06-11 Thorn Electrical Ind Ltd Discharge lamps
DE2718527A1 (de) * 1977-04-26 1978-11-09 Patra Patent Treuhand Spektrallampe zur erzeugung des eisenlinienspektrums
US4197480A (en) * 1978-09-11 1980-04-08 Westinghouse Electric Corp. Reflector-type hid sodium vapor lamp unit with dichroic reflector

Also Published As

Publication number Publication date
DE3376922D1 (en) 1988-07-07
DK548283A (da) 1984-05-31
EP0110645A2 (de) 1984-06-13
EP0110645A3 (en) 1985-05-29
DK548283D0 (da) 1983-11-30

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