EP0213495A2 - Schmelzfixierlampe mit mehreren Intensitäten - Google Patents

Schmelzfixierlampe mit mehreren Intensitäten Download PDF

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Publication number
EP0213495A2
EP0213495A2 EP86111217A EP86111217A EP0213495A2 EP 0213495 A2 EP0213495 A2 EP 0213495A2 EP 86111217 A EP86111217 A EP 86111217A EP 86111217 A EP86111217 A EP 86111217A EP 0213495 A2 EP0213495 A2 EP 0213495A2
Authority
EP
European Patent Office
Prior art keywords
envelope
lamp
filaments
lamp according
contact means
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.)
Ceased
Application number
EP86111217A
Other languages
English (en)
French (fr)
Other versions
EP0213495A3 (de
Inventor
Merle E. Morris
Lawrence M. Rice
Steven L. Meade
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.)
Osram Sylvania Inc
Original Assignee
GTE Products 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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0213495A2 publication Critical patent/EP0213495A2/de
Publication of EP0213495A3 publication Critical patent/EP0213495A3/de
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated

Definitions

  • the present invention relates in general to tubular incandescent lamps, and pertains, more particularly, to such lamps as applied in heating or photoreproduction processes.
  • a photocopy machine typically employs two different types of lamps, one being referred to as an exposure lamp and the other as a fusing lamp.
  • the exposure lamp is purely for light emitting purposes during the exposure phase of operation.
  • the fusing lamp on the other hand is primarily for heating purposes to "set" the toner employed in the photocopy machine.
  • the principles thereof are applied primarily in connection with a fusing lamp, but may also be applied to other general heating purposes.
  • Fusing lamps are typically of single filament construction and have a length corresponding to the maximum size (length) of paper that is to be reproduced.
  • One infrared lamp in particular, has utilized two filaments disposed and electrically connected in parallel within a quartz envelope in order to allow substantially higher operating wattages to be achieved by simultaneously energizing both filaments (see U.S. Pat. No. 3,433,144 to Robert Freeze).
  • the use of parallel filaments provides higher heat density per unit area of envelope wall.
  • the lamp in Freeze, as described does not provide for selective activation of the filaments (i.e. dual level fusing), to adjust for different incremental wattage output requirements.
  • the Freeze lamp provides a series of spacers disposed along the length of the filaments to prevent them from sagging against the quartz envelope, but does not isolate the filaments from each other to prevent shorting.
  • tubular incandescent lamp providing multiple levels of energy for heating applications while promoting compactness and manufacturing ease would constitute a significant advancement in the art.
  • Still another object of the invention is to provide an improved incandescent lamp which is compact, can be produced both at a lower cost and on a mass production basis.
  • a tungsten-halogen incandescent lamp comprising a tubular quartz envelope having first and second press sealed end portions, a pair of coiled tungsten filaments extending longitudinally through the interior of the tubular envelope and a fill gas mixture disposed within the envelope.
  • the lamp further includes first contact means associated with the first press sealed end portion and electrically coupled to a first end of each of the filaments, second contact means associated with the second press sealed end portion and electrically coupled to a second end of one of the filaments, the filament being energized upon application of a predetermined voltage across the first and second contact means, and third contact means associated with the second press sealed end portion and electrically coupled to an unattached second end of one of the filaments, the filament being energized upon application of a predetermined voltage across the first and third contact means.
  • the lamp also includes means for electrically isolating each of the filaments, the electrically isolating means disposed within and extending longitudinally through the interior of the envelope.
  • a lamp 10 which comprises a tubular envelope 12 of vitreous material having first and second press-sealed end portions 14 and 16, respectively. Ends 14 and 16 are located at the opposed ends of envelope 12 and are formed by utilizing pressing operations and apparatus know in the art.
  • Envelope 12 should preferably be made of a material having a high melting point, such as fused silica or quartz.
  • Lamp 10 is of the tungsten-halogen variety, therefore it has a fill gas mixture containing an inert gas and a halogen or halide.
  • the lamps are filled at about one atmosphere of argon (as the inert gas) and have about 200 micrograms of bromine (specifically methyl bromide).
  • the preceding fill constituents should serve only to illustrate what the compositional make-up of a fill gas mixture normally consists of and not serve to limit the present invention.
  • Lamp 10 further includes a pair of tungsten filaments, 18 and 20, which are disposed within envelope 12 and extend longitudinally through the interior of the envelope.
  • Previous lamps especially the lamp in the Freeze patent (U.S. Pat. No. 3,443,144), have typically included means for spacing or supporting the filament to prevent it from touching the envelope wall.
  • the drawbacks to utilizing the spacer means provided in Freeze involves the difficulty of inserting such a spacer within a mass produced lamp envelope and the insufficiency of electrical isolation between filaments to prevent possible shorting. Accordingly, the instant invention uniquely provides means for electrically isolating the filaments while promoting compactness and simplifying assembly of the lamp.
  • filaments 18 and 20, as illustrated in FIG. 1, are electrically isolated from one another by isolating means, comprising two tubes, 22 and 24, that are disposed longitudinally within envelope 12. Filaments 18 and 20 extend longitudinally through tubes 22 and 24, respectively. Tubes 22 and 24 should be made of electrically insulative material that is transparent and has a high melting point, such as quartz. Tubes 22 and 24 extend the length of the interior of envelope 12 to about 1 millimeter (mm) from press sealed end portions 14 and 16. The filaments could conceivably be sufficiently electrically isolated by using one tube about one of the filaments. The filaments are also hermetically sealed within end portions 14 and 16.
  • Supporting filaments 18 and 20 at preselected points (about 25.4 mm apart) along the length thereof are a plurality of support members 26 (illustrated in FIG. 1), each comprising a coil element having one end wound about (and thus secured to) each of filaments 18 and 20 and the other end (of greater diameter) positively engaging the interior wall of tubes 22 and 24, respectively.
  • filaments 18 and 20 possessed an overall length of about 350 mm.
  • envelope 12 is a T-5 quartz tube having an outer diameter of about 15 mm with a thickness of about 1 mm.
  • Tubes 22 and 24 are T-2 quartz tubes having outer diameters of about 6 mm and thicknesses of about 1 mm.
  • Ceramic bases or end caps 28 and 30 are preferably used. Accordingly, it is only necessary in the respective photocopier to provide some means for accepting this component. Understandably, such a means can be of relatively simple design. Ceramic bases 28 and 30 are also preferably of substantially cylindrical configuration and include a slot therein designed for having the flattened press-sealed end portions, 14 and 16, inserted therein.
  • Filaments 18 and 20 are energized by means of applying a predetermined voltage across contact means located within the press sealed end portions of lamp 10.
  • first contact means 32 is associated with end portion 14, while second contact means 34 and third contact means 36 are associated with end portion 16.
  • First contact means 32 is comprised of a first lead-in conductor 32a, which extends externally from and internally within end portion 14, and a foil portion 32b disposed within portion 14 and electrically coupled to both conductor 32a and to a first end 18a and 20a of filaments 18 and 20, respectively.
  • Second contact means 34 is comprised of a second lead-in conductor 34a, which extends externally from and internally within end portion 16, and a foil portion 34b disposed within portion 16 and electrically coupled to both conductor 34b and to a second end 18b of filament 18.
  • third contact means 36 is comprised of a third lead-in conductor 36a, extending externally from and internally within end portion 16, and a foil portion 36b disposed within end portion 16 and electrically coupled to both conductor 36a and to an unattached second end 20b of filament 20.
  • Lead-in conductor 32 is coupled to a lead wire A, which is in turn coupled to the common terminal of a power source 38.
  • Lead-in conductors 34 and 36 are coupled to lead wires B and C, respectively, while wires B and C are then coupled to a control switch 40 that is coupled to power source 38.
  • Leads A, B and C are stranded 16 AWG (AWG - American Wire Gauge) teflon insulated wire which is rated at 600V and 200°C.
  • Lead wires B and C, through switch 40 are adapted to apply a voltage across filaments 18 and 20, individually or simultaneously. Filaments 18 and 20 may be of varying wattages, but the total wattage output of filaments 18 and 20 together must be greater than either individually.
  • filament 18 is rated at about 375 watts (120V) and filament 20 is rated at about 1250 watts (120V); the overall wattage output possible in lamp 10 would thus be about 1625 watts.
  • the overall length of lamp 10 is about 420 mm.
  • Lamp 50 has an envelope 52 which contains therein isolating means 54, which isolates filament 18 from filament 20, that extends longitudinally therethrough.
  • Isolating means 54 comprises an insulative divider which forms at least two chambers within envelope 52 (see FIG. 2B).
  • divider 54 is structurally a part of envelope 52 and extends to press sealed end portions 14 and 16 (as partially illustrated in FIG. 2C).
  • divider 54 is substantially planar in configuration and forms dual chambers within envelope 52 which are sealed at end portions 14 and 16.
  • envelope 52 and divider 54 are formed from quartz and may be formed in a single manufacturing step by forming a quartz tube with dual bores or chambers.
  • the quartz tube (or envelope 52) may have an elliptical shape with two dome-shaped chambers within.
  • the tube has a diameter "D" of about 15 mm (millimeters), with an inner diameter "d” of about 13 mm.
  • Divider 54 has a length "L" of about 11 mm and the diameter of each chamber is about 6 mm.
  • Divider 54 of lamp 50 need not be a part of envelope 52, but need simply be an insert that provides a similar function as described earlier. Accordingly, the instant invention uniquely provides means for isolating the filaments while promoting compactness and simplifying assembly of the lamp.
  • Lamp 50 is similar to lamp 10 with respect to filament lengths and wattages, fill gas mixture, overall lamp length, lead wire connections and lamp-circuit connection.
  • Lamps 10 and 50 are lamps which provide infrared heating primarily for photocopier machine applications but are not limited to such applications. These lamps provide multiple levels of fusing energy per square centimeter of paper regardless of the design length, depending on the demands arising from the particular application, without unnecessarily complicating the production of such a lamp.
  • the filament length may be designed at a fixed length as needed for the particular application, but means are provided for varying the amount of energy per square centimeter of paper by burning either filament separately or simultaneously to provide at least three levels of fusing energy total and per square centimeter of paper.
  • Infrared lamps made in accordance to the teachings of the present invention will significantly improve a photocopy machine fusing system's speed in achieving start-up temperatures. For example, using the wattages already described earlier for lamps 10 and 50, at start-up 1625 watts of energy (both filaments energized) is supplied to the fusing system. Shortly thereafter (about 1 or 2 photocopies later) the energy needed would shift to 1250 watts (one filament) and then perhaps to 375 watts (alternate filament), still supplying enough energy to fix the toner properly to the paper. Depending on the fusing system, the higher wattage filament may be used for fusing and switching could be controlled by a thermostat that could switch between filaments of different wattages as needed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Resistance Heating (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP86111217A 1985-08-15 1986-08-13 Schmelzfixierlampe mit mehreren Intensitäten Ceased EP0213495A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US76597585A 1985-08-15 1985-08-15
US765975 1985-08-15

Publications (2)

Publication Number Publication Date
EP0213495A2 true EP0213495A2 (de) 1987-03-11
EP0213495A3 EP0213495A3 (de) 1989-04-12

Family

ID=25075031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111217A Ceased EP0213495A3 (de) 1985-08-15 1986-08-13 Schmelzfixierlampe mit mehreren Intensitäten

Country Status (3)

Country Link
EP (1) EP0213495A3 (de)
JP (1) JPS6297254A (de)
CA (1) CA1262170A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2154707A3 (de) * 2008-07-28 2011-03-23 Ushio Denki Kabushiki Kaisha Glühlampe
US7932665B2 (en) 2008-12-02 2011-04-26 Osram Sylvania Inc. Dual filament lamp for rapid temperature processing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008135313A (ja) * 2006-11-29 2008-06-12 Matsushita Electric Ind Co Ltd 発熱体ユニット及び加熱装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE354773A (de) *
US4442374A (en) * 1982-03-25 1984-04-10 Gte Products Corporation Dual length copier lamp
BE896913A (nl) * 1983-06-01 1983-10-03 Marchand Paul F Ontwerp-delta-lamp (gloeilamp),

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2154707A3 (de) * 2008-07-28 2011-03-23 Ushio Denki Kabushiki Kaisha Glühlampe
US8488953B2 (en) 2008-07-28 2013-07-16 Ushio Denki Kabushiki Kaisha Filament lamp
US7932665B2 (en) 2008-12-02 2011-04-26 Osram Sylvania Inc. Dual filament lamp for rapid temperature processing

Also Published As

Publication number Publication date
JPS6297254A (ja) 1987-05-06
EP0213495A3 (de) 1989-04-12
CA1262170A (en) 1989-10-03

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Inventor name: RICE, LAWRENCE M.

Inventor name: MEADE, STEVEN L.