EP0428836A2 - Radiateur infrarouge - Google Patents

Radiateur infrarouge Download PDF

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Publication number
EP0428836A2
EP0428836A2 EP90115948A EP90115948A EP0428836A2 EP 0428836 A2 EP0428836 A2 EP 0428836A2 EP 90115948 A EP90115948 A EP 90115948A EP 90115948 A EP90115948 A EP 90115948A EP 0428836 A2 EP0428836 A2 EP 0428836A2
Authority
EP
European Patent Office
Prior art keywords
radiator
filament
free ends
inner lines
radiator according
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.)
Withdrawn
Application number
EP90115948A
Other languages
German (de)
English (en)
Other versions
EP0428836A3 (en
Inventor
Udo Hennecke
Helmut Wölz
Walter Dieudonné
Werner Kreuter
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.)
Heraeus Quarzglas GmbH and Co KG
Original Assignee
Heraeus Quarzglas GmbH and Co KG
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 Heraeus Quarzglas GmbH and Co KG filed Critical Heraeus Quarzglas GmbH and Co KG
Publication of EP0428836A2 publication Critical patent/EP0428836A2/fr
Publication of EP0428836A3 publication Critical patent/EP0428836A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0033—Heating devices using lamps
    • H05B3/009—Heating devices using lamps heating devices not specially adapted for a particular application

Definitions

  • the invention relates to a short-wave infrared radiator with an elongated, one-piece twin tube with an inner web, which separates two longitudinally extending subspaces from each other, in each of which a filament is arranged, and with two seals at the ends of the twin tube that lead to the outside Current feedthroughs, with the two current feedthroughs being directly connected to the two free ends of the respectively assigned filament at one radiator end and the radiator being heatable either over its entire length or over a partial length by means of external terminal assignment.
  • a particular area of application for such emitters which can optionally be heated over their entire length or only over a partial length, are the rollers of printers, in particular of laser printers.
  • a heatable roller is used, over which the paper coated with toner runs. Since such laser printers have to be built very compactly, the individual components, ie also the diameters of the individual rollers, are kept very small. As a result, the space inside the roller is very limited in order to heat this roller from the inside with a heater.
  • such lamps must be interchangeable due to their limited life; such an exchange takes place via the bearing parts, which can be removed from the roller.
  • the free cross-section then available for inserting such a radiator into the roller is approximately 30 to 40 mm.
  • Today's modern printers are designed to optionally copy different paper formats, for which purpose they are switched from format size to format size.
  • the entire width of the copier is required and consequently the entire length of the heating roller is heated or, for smaller paper formats, only a partial length of the heating roller is heated.
  • the standard format is the A4 format
  • only the partial area of the roller is heated for the majority of the copies to be made. This procedure saves energy, and the device is not unnecessarily heated up inside.
  • the entire roller must be heated up quickly, so that a radiant heater is required in the roller with a short heating-up time of less than 1 second.
  • infrared emitters For heating such printer rollers, infrared emitters with a twin tube of the type described at the beginning have proven themselves.
  • infrared radiators In order to make better use of the interior space in the roller with known infrared radiators, up to four individual radiators, each with a single coil, are used, the radiators being used in pairs to heat the partial region of the roller, while the other pair are used to heat the entire length of the roller is added. These four individual radiators result in a complex structure.
  • twin tube emitters are operated in the short-wave radiation range, which means that they are filled with a protective gas atmosphere and sealed to the outside. Purely in terms of circuitry, it seems unproblematic to heat the heating coil only over a partial area or over the entire length, for which purpose additional connections have to be provided, which cannot be easily installed in a twin tube heater, since the drawn cladding tubes cannot be drilled arbitrarily. Already with ordinary emitters it is expensive to lead the connections to the outside at the crimped ends, since such current feedthroughs are limited by their current and heat resistance.
  • the object of the invention is to create an infrared radiator which can be operated over its full length or a partial length, both filaments always being used to optimize performance.
  • the inner lines are each surrounded by a capillary tube made of quartz glass, at least in their area running parallel to the coil.
  • the taps are each arranged in the central region of the coil and the two inner lines are connected to one another via a short-circuit bridge led through the incision, while the free ends of the coil are each connected to a current leadthrough.
  • the two inner lines are each led to the outside via their own current feedthrough, while the free ends of both Wendein are connected to one another at this radiator end via a short-circuit bridge and lead to a common current feedthrough to the outside.
  • the twin tube is made of quartz glass.
  • the construction which is compact in spite of the high radiation intensity, has proven to be advantageous, so that the emitter can be introduced, for example, into the interior of rotating rollers for graphic purposes. Due to the external wiring, a uniform intensity density can be achieved over the full length or the partial length, so that, for example, when used in graphic apparatus, uniform exposure is possible over the entire image area.
  • the radiator according to the invention consists of a quartz glass bulb 1 in the form of a twin tube, in which two tubular partial spaces 2, 3 are spatially separated from one another by an intermediate web 4.
  • a filament 5, 6 arranged parallel to the tube axis, the free ends 7, 8, 9, 10 of which are each connected to a current feedthrough 11, 12, 13, 14 that is sealed off from the outside space.
  • both coils 5, 6 are each provided with taps 15, 16, which divide the heating coil into approximately identical sections 5 ', 5 ⁇ , 6', 6 ⁇ , each with approximately the same resistance values.
  • the taps 15, 16 are connected to inner lines 17, 18, each of which is surrounded by a capillary tube 19, 20 for the purpose of insulation with respect to the helix in their sections running parallel to the intermediate web 4.
  • the intermediate web 4 is provided at one end of the radiator with an incision 21 through which a short-circuit bridge 22 connecting the two inner lines 17, 18 runs.
  • a short-circuit bridge 22 connecting the two inner lines 17, 18 runs.
  • the current feedthroughs 11, 12, 13, 14 are guided over molybdenum foils 23 melted into the piston material.
  • Argon has proven particularly useful as a gas filling.
  • connection options explained below are based on a DC voltage source with positive and negative terminals. It is of course possible to operate the emitters with reverse polarity or with alternating current, but for the sake of a better overview the connection option is explained using the direct current representation.
  • the terminals 11 ', 13' of the current feedthroughs 11, 13 are connected to the positive terminal of the voltage source, while the connections 12 ', 14' of the current feedthroughs 12, 14 with the negative terminal the voltage source. In this way, a series connection of two partial coils connected in parallel, which enables uniform radiation over the entire length, is created.
  • the circuit shown in FIG. 2 corresponds in its mode of operation during operation over the full length of the arrangement explained in FIG. 1.

Landscapes

  • Resistance Heating (AREA)
EP19900115948 1989-11-20 1990-08-21 Infrared radiator Withdrawn EP0428836A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3938437 1989-11-20
DE19893938437 DE3938437A1 (de) 1989-11-20 1989-11-20 Infrarot-strahler

Publications (2)

Publication Number Publication Date
EP0428836A2 true EP0428836A2 (fr) 1991-05-29
EP0428836A3 EP0428836A3 (en) 1992-02-12

Family

ID=6393830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900115948 Withdrawn EP0428836A3 (en) 1989-11-20 1990-08-21 Infrared radiator

Country Status (3)

Country Link
EP (1) EP0428836A3 (fr)
JP (1) JP2535665B2 (fr)
DE (1) DE3938437A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9113022U1 (de) * 1991-10-19 1992-01-16 Heraeus Quarzglas GmbH, 6450 Hanau Kurzwelliger Infrarot-Strahler
DE4438871A1 (de) * 1994-11-03 1996-05-09 Heraeus Noblelight Gmbh Infrarotstrahler mit einem flächenhaft ausgebildeten Widerstandskörper als Strahlungsquelle
JP5013044B2 (ja) † 2005-11-30 2012-08-29 ウシオ電機株式会社 光照射式加熱装置
EP3252799A1 (fr) 2016-06-01 2017-12-06 Speziallampenfabrik Dr. Fischer GmbH Emetteur infrarouge
DE102018125310A1 (de) * 2018-10-12 2020-04-16 Heraeus Noblelight Gmbh Heizeinrichtung mit Infrarot-Strahlern

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH262908A (de) * 1943-03-03 1949-07-31 American Electro Metal Corp Elektrisches Heizelement.
DE1063725B (de) * 1953-08-22 1959-08-20 Eltra Kg Leicht & Trambauer Elektrischer, nach Wahl ganz oder ueber eine Teillaenge beheizbarer Heizkoerper
DE1831315U (de) * 1959-09-21 1961-05-18 Continental Elektro Ind Ag Elektrischer rohrheizkoerper.
US3330939A (en) * 1965-09-22 1967-07-11 Gen Motors Corp Electric hot plate
US4039996A (en) * 1976-05-04 1977-08-02 Emerson Electric Co. Electric heating elements
EP0051847B1 (fr) * 1980-11-10 1984-07-25 AG Ernest Fischer's Söhne Calandre ayant au moins un cylindre comportant un dispositif de chauffage
GB8412339D0 (en) * 1984-05-15 1984-06-20 Thorn Emi Domestic Appliances Heating apparatus
JPH0221667U (fr) * 1988-07-29 1990-02-14

Also Published As

Publication number Publication date
JPH03176983A (ja) 1991-07-31
DE3938437A1 (de) 1991-05-23
JP2535665B2 (ja) 1996-09-18
EP0428836A3 (en) 1992-02-12
DE3938437C2 (fr) 1993-05-06

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