JPH03176983A - Infrared radiation device - Google Patents

Abstract

PURPOSE: To always excellently use two coils to optimize output by providing a notch in an area of one end part of an irradiator for a web. CONSTITUTION: When an irradiator is driven over the total length of the irradiator, terminals 11' and 13' of lead wires 11 and 13 are connected to a positive terminal of a power source, and terminals 12' and 14' of the other lead wires 12 and 14 are connected to a negative terminal of the power source. In this way, series connection of two mutually parallel connected divided coils is formed, and such parallel connected divided coils can generate uniform irradiation over its total length. On the other hand, when an incandescent coil is desired to be driven over only a partial length, only the terminals 11' and 13' are connected to two terminals of a DC power source, and an electric current is made to flow to divided coils 5' and 6' connected in series to each other in this way, and the terminals 12' and 14' are not connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention comprises an internal web extending longitudinally and separating at least two compartments from each other, each compartment having one
It comprises an integral dual tube extending in the longitudinal axis direction in which two incandescent coils are disposed, and two sealed lead wires each drawn out to the outside at the ends of the dual tube, the lead wires being , a short wavelength infrared radiating device which is directly connected at one end to both free ends of the associated incandescent coil and which can be selectively heated over its entire length or over a partial length by means of an external connection; Regarding.

Ileracus Quarzschme
lze Gmbll) document number 2C4,88/VN
From the brochure of Ku r I NFRAROTJ, a short-wavelength dual-tube sky infrared ray in which each compartment in a dual tube having compartments separated by an internal web contains an incandescent coil extending parallel to the tube axis. Radiating devices are known. The incandescent coils each have a sealed lead wire drawn out to the outside at the end of the dual tube, and a coil part is formed between the connection terminals, while the other part is incandescent. The lead wire portion is formed as a lead wire portion extending in the longitudinal direction without having any. The relatively displaced coils selectively drive one incandescent coil or the other incandescent coil of the dual tube, respectively driving the left or right part of the radiator or two incandescent coils. By connecting them in parallel, it is possible to emit infrared rays over the entire length.

A particular field of use for radiation devices of this type, which can be selectively heated over their entire length or over a partial length, is as a roll in blinkers, in particular in laser printers.

Such laser printers employ heatable rolls along which a sheet of paper coated with toner runs. Since such laser printers have to be assembled in a very compact structure, the diameters of the individual components or parts, and therefore also of the individual rolls, have to be very small. As a result, the space available inside the roll is severely limited, to the extent that the roll has to be heated from the inside with a single radiator or radiator. Additionally, such lamps must not be replaceable due to their limited useful life. This exchange takes place via a bearing that can be removed from the roll. The free cross section available for buttoning such a radiator or radiator into a roll is in the range of about 30 to 40 mm. Modern printers are designed to selectively copy paper in various formats, and for this purpose the printers are switchable by format size. Depending on the paper format,
The full width of the copying machine is required, so that the heating roll is heated over its entire length, or alternatively, in the case of small paper formats, only a partial length of the heating roll is heated. Usually formats DIN^3 and DIN
Only A4 is copied and the standard format is DI
Because of the N-^4 format, only partial areas of the roll are heated for most copies to be made. This method is energy saving and, in addition, the device is not heated internally unnecessarily. However, in order to switch the equipment from the small size DIN-A4 format to the large size DIN-A3 format, it is necessary to
A short j-side heating time is required.

It has already been found that infrared emitters with dual tubes of the type mentioned at the outset are suitable for heating such printer rolls. In order to make better use of the internal space of rolls with known infrared emitters, it is possible to incorporate up to four individual infrared emitters, each with only one incandescent coil, and to use the radiators for heating partial areas of the roll. When used in pair configuration, on the other hand, if the roll is to be heated over its entire length, the other radiator pair is additionally used. However, the use of four individual infrared emitters in this manner results in an expensive construction.

The dual back radiator is operated in the short wavelength radiation range, so the dual back radiator is filled with a protective gas atmosphere and sealed from the outside. In terms of pure circuit technology, there seems to be no problem in heating the heating coil only over a partial area or over its entire length. However, for this purpose additional connection terminals must be provided, which cannot be easily integrated into a dual back radiator. This is because holes cannot be arbitrarily formed in the pultruded outer tube. Even in conventional radiating devices, it is technically difficult to pull the connecting wire to the outside at the crushed end. This is because such lead wire portions are limited in terms of current and thermal resistance.

In other fields of use, for example in the field of electromagnetically heated tube-side heating bodies, it has already been proposed to heat partial lengths or the entire length by dividing the heating coil in the form of dividing resistors. ing. A structure of this kind is known, for example, from German Utility Model No. 1831315 or German Patent Application No. 1063725 (DB-As). Good accessibility to the tube-side heating element is also a prerequisite for such devices.

[Objective of the invention] The object of the invention is to start from an infrared radiation device of the type mentioned at the outset, which can be driven selectively over its entire length or over a partial length, so as to optimize the output. Add 2 to the bean paste to make it
An object of the present invention is to provide an infrared radiation device that makes it possible to effectively utilize two coils.

[WI Relation and Effect of the Invention] According to the present invention, the above-mentioned problem is solved by the configuration described in the so-called characteristic part of claim 1.

In a preferred embodiment, the inner conductor comprises at least
In a region extending parallel to the coil, each rises and is surrounded by a capillary tube made of quartz glass.

In another preferred embodiment, the taps are each provided in the central region of the coil, the two internal conductors are connected to each other via a shorting piece inserted through the cutout, while the free ends of the coil are each provided with a lead. connected to the line.

In another preferred embodiment, the two internal conductors are each led out via their own lead wire, while the free ends of the two coils are connected to a shorting strip on the same radiator end side. They are connected to each other through a common lead wire and are drawn out to the outside through a common lead wire.

According to the configuration of the present invention, despite the large radiation intensity,
A compact construction form is obtained, thus making the radiating device
For example, it has the advantage that it can be incorporated inside a rotating roll for transfer. In this case, depending on the external connection, a homogeneous intensity or brightness density is obtained over the entire length or over a partial length, allowing for example uniform exposure over the entire image surface when used in a transfer device. .

[Embodiment] The present invention will be described in detail below with reference to FIGS. 1 to 3.

With reference to FIG. 1, the radiation device according to the invention comprises a quartz glass tube 1 in the form of a dual tube in which two tubular compartments 2.3 are spatially separated from each other by an intermediate web 4.
It consists of In each of the two divided chambers 2.3,
An incandescent coil 5.6 is provided, each arranged parallel to the tube axis, at the free end 7.6 of the incandescent coil.
8.9.10 are each connected to a Riet wire 11.12.13.14 which is sealed against external space. The two coils 5.6 have a tap I5 in their central area.
．． 16 are provided, these taps dividing the heating coil into substantially identical divisions 5', 5'', 6', 6'' each having approximately the same resistance value. Tap 15.16 is connected to internal conductor 17.18. The inner conductors 17 , 18 are each surrounded in a section extending parallel to the intermediate web 4 by a capillary tube 19 , 20 in order to insulate the coil.

The intermediate web 4 has a notch 21 at one end of the emitting device.
This notch 21 has two internal conductors 1
7, a shorting piece 22 that connects I8 passes through it. In order to seal the dividing chamber 2.3 filled with protective gas, the leads 11.12.13, I4 are led out via a molybdenum foil 23 which is fused and embedded in the envelope material. Argon is particularly advantageous as filling gas.

In the connection example described below, a DC power supply having a positive terminal and a negative terminal is used. However, it is self-evident that it is also possible to drive the radiating device with an inverted frame or with an alternating current. However, for the sake of clarity, a connection example using direct current will be described.

When driving the radiating device over the entire length of the radiating device shown in FIG.
3° to the positive terminal of the power supply, and the other lead wire 12.
14 terminals 12', 14° are connected to the negative terminal of the power supply. In this way, a series connection of two mutually parallel-connected split coils is formed, which parallel-connected split coils can generate an even radiation over their entire length.

On the other hand, if you want to drive part of the incandescent coil over a long length, connect only the terminals 11' and 13' to the two terminals of the DC power supply, and then drive the divided coil 5' connected in series.
, 6゛. Terminals 12' and 14° are not connected.

The circuit shown in FIG. 2 corresponds in its operation and effect to the case of driving the device described with reference to FIG. 1 over its entire length. On the other hand, when driving over the partial length, the lead wire 24 connected to the shorting piece 22 is connected to the positive terminal of the power supply via the terminal 24', and the terminals 1F and 13' are connected to the positive terminal of the power supply through the terminal 24'. is connected to the negative terminal of the power supply, and the two split coils 5',
6° can be connected in parallel, thereby generating higher output power with the same supply voltage.

Referring to FIG. 3, the two internal conductors 17, 18 connect to external contacts 11", 13 via leads II, 13, respectively.
On the other hand, the heating coil having the split coils 5'' and 6'' is connected to one shorting piece 22 through the notch 21, and this shorting piece 22 is connected to the lead wire 2.
4 to an external terminal 24''.

In this configuration, two divided coils 5 of the incandescent coil are used.
', 6° are connected in series, and the terminals 11'', 13'' are connected to the positive and negative terminals of the power supply, respectively, while the middle lead 24 is not powered. However, also similar to the embodiment described with reference to FIG. 2, the intermediate terminal 24"
For example, connect to the positive terminal of the power supply and terminal 11”, I
It is also possible to connect 3'' to the negative terminal of the power supply.

According to the latter connection type, current flows in parallel to the two divided coil parts of the incandescent coil, and high output can be obtained with the same power supply voltage.

If you wish to drive the radiating device shown in Figure 3 over its entire length, connect terminal 24'' to the positive terminal of the power supply.
Connect terminals 12'', 14'' to the negative terminal of the power supply.

[Brief explanation of drawings]

FIG. 1 shows an infrared radiation lamp or device in which all the free ends of the coils are each provided with a lead wire drawn out to the outside, while the internal conductors are connected to each other via an internal shorting piece; FIG. , FIG. 2 shows an infrared emitting device which substantially corresponds to the infrared emitting device shown in FIG. 1 but differs in that a shorting piece connected to the lead wire is provided between the two internal conductors. FIG. 3 shows that the two internal conductors are led out through their own lead wires, while the free ends of the incandescent coil are connected to each other via a shorting piece on one side of the radiator. , while the shorting piece shows an infrared emitting device connected to the outside by a single lead wire. l...Quartz glass tube 2.3...Divided chamber 4...Intermediate web 5.6...Incandescent coil 5', 5'', 6', 6''...Divided coil portion 7.8 ．．
9, JO...Free end] 1.12.13.14.24...Lead wire 15.1
6... Electric tap I7.18... Internal conductor] 9.20... Capillary tube 21... Notch 22... Shorting piece 491°

Claims (1)

Claims: 1. A longitudinally extending monolithic dual body comprising an internal web extending longitudinally and isolating at least two compartments from each other, each of said compartments having an incandescent coil disposed therein; a tube and two sealed leads each brought out to the outside at the ends of the dual tubes, the leads being connected at one end to both free ends of each associated incandescent coil. In a short-wavelength infrared radiation device which is directly connected and can be selectively heated over its entire length or over a partial length by an external connection method, the incandescent coil (5,
6) extends over substantially the entire length of the dividing chambers (2, 3), each coil being divided by an electric tap (15, 16) into at least two incandescent coil parts, the two dividing chambers ( 2, 3) Incandescent coil part (5', 5", 6', 6"
) are equal to each other in length and the coils (5, 6
) electrically insulated internal conductors (17, 18) starting from said taps (15, 16) are led out and connected to at least one radiating device end on both sides of said internal web (4). formed as an end and said web (4
) is a short-wavelength infrared radiation device, characterized in that the radiation device is provided with a notch (21) in the region of said one end. 2. The internal conductors (17, 18) are connected to at least the coils (5, 18).
2. The radiation device according to claim 1, wherein the radiation device is surrounded by a capillary tube (19, 20) in each region extending parallel to 6). 3. The radiation device according to claim 2, wherein the capillary tubes (19, 20) are made of quartz glass. 4. Taps (15, 16) are respectively coils (5, 6)
in the central region of the tap, the ohmic resistance between said tap (15, 16) and the free end (7, 8, 9, 10) of the associated coil (5, 6) being approximately the same magnitude on both sides. The radiation device according to any one of claims 1 to 3. 5. At the other end of the radiator, connect the two lead wires (11,
13) are the two free ends of the associated incandescent coils (5, 6) (
7, 9) and said two internal conductors (17, 9).
18) is the shorting piece (22) inserted into the notch (21)
The radiation device according to any one of claims 1 to 4, wherein the radiation devices are connected to each other via. 6. At the other end of the radiator, incandescent coils (5, 6
) are brought out to the outside via at least one additionally sealed lead wire (24), said two inner conductors (17, 18) each having its own lead wire. The radiation device according to any one of claims 1 to 4, which is led out to the outside via a line (11, 13). 7. The radiation device according to claim 1, wherein the dual tube (1) is made of quartz glass. 8. In order to heat the radiating device over a partial length, a potential difference of the power source is applied only to the two free ends (7, 9) of the two incandescent coils (5, 6) at one end of the radiating device. The radiation device described in . 9. The radiating device according to claim 6, wherein a potential difference of the power source is applied to the two internal conductors (17, 18) led out to the outside in order to heat the radiating device over its partial length. 10. In order to heat the radiator over its partial length, the same potential is applied to the two externally drawn internal conductors (17, 18), and the incandescent coil section (5
, 6), wherein a potential difference of a power source is applied at the same potential to the two free ends of the radiating device. 11. In order to heat the radiator over its entire length, the two free ends (7, 9) at one end of the radiator and the two free ends (8, 10) at the other end of the radiator are at the same potential, respectively. 7. The radiation device according to claim 5, wherein a potential difference of a power source is applied at . 12. A radiation device according to any one of claims 1 to 11, which is used as a heatable roll for a printer.