CN1278195C - Fixing apparatus - Google Patents
Fixing apparatus Download PDFInfo
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- CN1278195C CN1278195C CN 02154737 CN02154737A CN1278195C CN 1278195 C CN1278195 C CN 1278195C CN 02154737 CN02154737 CN 02154737 CN 02154737 A CN02154737 A CN 02154737A CN 1278195 C CN1278195 C CN 1278195C
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- fixing device
- coil
- heater block
- heat
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Abstract
A fixing device includes a coil for generating a magnetic field; a heating medium having an electroconductive layer which is provided at its inside with said coil, wherein eddy currents are generated by a magnetic field generated by current through said coil so that heat is generated in said electroconductive layer, and an unfixed toner image is fixed on a recording material by the heat, and said heating medium has an inner side spaced from said coil and having a dark color.
Description
Technical field
The present invention relates to a kind of with induction heating as the heating arrangement of pyrotoxin, use this heating arrangement with the toner image heat fixer that forms on the recording materials such as recording chart or transfer paper on these recording materials heat fixing device and be suitable for the image processing systems such as electro-photography apparatus, electrostatic recording apparatus, Printers and Faxes machine of this heat fixing device.
Background technology
In image processing systems such as electro-photography apparatus, electrostatic recording apparatus, Printers and Faxes machine etc., the toner that directly is formed at or is transferred on the recording materials is set as the heat fixing device of heat fixer to these recording materials.This heat fixing device has the fixing roller that for example is also referred to as the warm-up mill of toner on the heat fusing recording materials and is crimped on this fixing roller backer roll with the clamping recording materials.Fixing roller forms hollow shape, on the central shaft of this fixing roller, keeps heater by holding member.Heater for example is made of tubuloses such as Halogen lamp LED heating well heater, generates heat by the voltage that applies regulation.Because Halogen lamp LED is positioned on the central shaft of fixing roller, thus the hot homogeneous radiation of sending from Halogen lamp LED to the fixing roller inwall, the Temperature Distribution of fixing roller outer wall is even in a circumferential direction.
The outer wall of fixing roller is heated to the temperature (for example 150-200 ℃) that temperature is suitable for photographic fixing.Under this state, the recording materials of rotation recording materials toner are adhered in fixing roller and the crimping of backer roll limit, the opposite towards each other direction clamping in limit.In the pressure contact portion of fixing roller and backer roll in (below be also referred to as (nip) portion of nipping), separate toner on the recording materials by the hot melt of fixing roller, the pressure by two roller effects comes photographic fixing on recording materials.
But, in above-mentioned heat fixing device with the heater that constitutes by halogen etc., because be used to radiation heat heat fixing roll from Halogen lamp LED, so after the energized, in the temperature of fixing roller arrives the time (below be called heat time heating time) of the set point of temperature that is suitable for photographic fixing, need the long period.During this period, exist the user can not use duplicating machine, the problem of long-time standby.
On the other hand, in order to shorten heat time heating time, apply the high-power of the operability that should improve the user to fixing roller, then the consumed power of heat fixing device increases, and produces the problem that deviates from energy-conservationization.Therefore, in order to improve the value of commodity such as duplicating machine, further note and pay attention to the realization of energy-conservationization of heat fixing device (low consumpting powerization) and user's operability raising (printing speed).
The device that should require is opened shown in the clear 59-33787 communique as the spy in response, and the heating arrangement that has disclosed the induction heating mode of utilizing high-frequency induction is as heating source.This heating arrangement is at the inner concentric configuration coil of the hollow fixing roller that is made of metallic conductor, cross the high frequency magnetic field that high-frequency current produces by this coil midstream, produce inductive loop in fixing roller, the skin resistance by fixing roller self makes fixing roller self joule heating.According to the heating arrangement of this induction heating mode, because the limit improves the conversion efficiency that is changed to heat from electricity, so can shorten heat time heating time.
But, in the heating arrangement of this induction heating mode, because coil midstream is crossed the big electric current of the tens of A of several A-, so the intensification problem that exists the joule heating of coil self to cause.In addition, be configured at inductive coil under the situation of inner space of heater block, the temperature of inductive coil is subjected to adding the hot media Temperature Influence, simultaneously, because also there is the heating of coil self, so become than the temperature height that adds hot media.Particularly not under the situation of Contact Heating medium, do not have the heat of coil to discharge the place at coil or coil unit etc., coil temperature rises very big.
As the countermeasure that prevents that inductive coil from heating up, open shown in the flat 09-197869 communique as the spy, add the radiance of hot media inside surface by reduction, reduce and add the influence of hot media inductive coil.In the method, can reduce the influence that adds hot media, but produce inductive coil self intensification that the inductive coil self-heating causes.When inductive coil or when supporting the temperature of coil former of inductive coil higher than the temperature that adds the inner space between hot media and coil former, as radiation heat, the heat of radioinduction coil in this inner space.
But, in order to reduce the radiance that adds the hot media inside surface, absorb this radiation heat, so can not effectively apply flexibly this radiation heat because add hot media.On the other hand, for temperature adjustment adds hot media, flow through electric current in inductive coil, its energy loss is big.
Under solid and situation that solid contacts, the heat when having thermograde moves because of heat conducting influence is big, and in addition, by under the situation of air layer, radiation heat is bigger than the influence of heat conduction as above-mentioned.
Here, in order to eliminate this prior art problems, require effectively to apply flexibly the structure of heat of the inductive coil of radiation.
Summary of the invention
The object of the present invention is to provide a kind of effective utilization to add the fixing device or the image processing system of the inductive coil heat of radiation in the interior space of hot media.
Another object of the present invention is to provide a kind of increases to the hot amount of movement that adds hot media easily, saves the fixing device or the image processing system of power by the heat radiation that makes inductive coil.
A further object of the present invention is to provide a kind of fixing device, has: the coil that produces magnetic field; Heater block is included in the conductive layer that the inboard has described coil, produces eddy current by the magnetic field that electric current produced crossed at described coil midstream, thereby produce heat in described conductive layer, comes on recording materials not photographic fixing toner picture of photographic fixing by heat; The inside surface of wherein said heater block is a black, and and described coil between gapped.
Another purpose of the present invention is to provide a kind of fixing device, has: the coil that produces magnetic field; Heater block is included in the conductive layer that the inboard has described coil, produces eddy current by the magnetic field that electric current produced crossed at described coil midstream, thereby produce heat in described conductive layer, comes on recording materials not photographic fixing toner picture of photographic fixing by heat; Coil former is arranged between described coil and the described heater block and with described heater block and has the gap; Wherein said coil former is close to described coil, and the inside surface of described heater block is a black.
Description of drawings
Fig. 1 is the structure diagram that is suitable for the image processing system of heat fixing device of the present invention.
Fig. 2 is with the cross-sectional view of heating arrangement of the present invention as the heat fixing device of thermal source.
Fig. 3 is the figure of the relation of expression radiance and coil temperature.
Fig. 4 is a radiant quantity to the be untreated temperature contrastive feature figure of thing and black handled thing of coil former surface.
Embodiment
Embodiments of the invention are described with reference to the accompanying drawings.
First embodiment
(1) image processing system example
Fig. 1 is the structural model sketch that is suitable for the image processing system of heat fixing device of the present invention, and the image processing system of this example is the laser beam printer that utilizes the transfer-type electrofax to handle.In Fig. 1, the 101st, as the electronic photographic sensitive of image carrier drum, have the regulation peripheral speed at the clockwise of arrow, be driven in rotation.
The 102nd, as charging unit have electric conductivity, a flexible charging roller, apply authorised pressure and be close to photosensitive drums 101, the rotation that is driven in photosensitive drums 101 is rotated or is driven in rotation.In addition, apply the charging bias voltage of regulation to this charging roller 102, the periphery uniform contact charging process of the photosensitive drums 101 of rotation is become polarity, the current potential of regulation by not shown power supply unit.
The 103rd, as the exposure device of information read-in unit, exposure device 103 is laser scanners, the laser after output is modulated corresponding to the digital pixel signal of image information sequential electricity, and by refracting telescope 103a, the uniform charging treated side of scan exposure rotating photosensitive drum 101.Thus, on the face of photosensitive drums 101, form electrostatic latent image corresponding to the scan exposure pattern.
The 104th, display, 101 of photographic fixing photosensitive drums go up the electrostatic latent image that forms and come video picture as toner image.104a is a developing roll, is applied the video picture bias voltage of regulation by not shown power supply unit.
The 105th, as transfer member have electric conductivity, a flexible transfer roll, apply authorised pressure and be close to photosensitive drums 101, form transfer printing bite T.By control regularly to transfer printing bite T transmit as OHT, recording chart (transfer paper) P of recording materials after the clamping carrying of not shown transport unit with regulation, the toner image of 101 sides of transfer printing photosensitive drums successively on recording chart P face.Regularly apply the polarity suitable bias voltage opposite by not shown power supply unit in the control of regulation with the toner charging polarity to transfer roll 105.
The 106th, not photographic fixing toner image is carried out the heat fixing device of heat fixer, after separating recording chart P successively from the face of photosensitive drums 101 by transfer printing bite T, import heat fixing device 106, the toner image on heating, the pressurization recording chart P is carried out photographic fixing and is handled on recording chart P.Recording chart P by heat fixing device 106 is arranged in image formation thing (duplicate, print).Heat fixing device 106 will be according to the heating arrangement of induction heating mode of the present invention as thermal source, as describing in detail in following (2).
The 107th, photosensitive drums face cleaning device, 101 of the photosensitive drums of removing after recording chart separates go up photosensitive drums surface pollution things such as residual residual toner of transfer printing or paper powder, carry out the face cleaning.Photosensitive drums face after 107 cleanings of cleaning device is supplied with imaging repeatedly.
(2) heat fixing device 106
Fig. 2 is with the cross-sectional model figure of heating arrangement of the present invention as the heat fixing device 106 of thermal source.The heat fixing device 106 of this example is a kind of hot-rolling type device, in as the fixing roller 1 of the heater block of induction heating and photographic fixing bite N, import as the portion of being close to of the backer roll 2 of pressure-producing part carry not photographic fixing toner image t as the recording chart P of recording materials after the clamping carrying, heat and the interlock of photographic fixing bite N by fixing roller 1 pressed, with not photographic fixing toner image t hot pressing photographic fixing on recording chart P face.
Fixing roller 1 be external diameter be 40mm, thickness be 0.7mm, as the iron axle cylinder of magnetic metal parts, lip-deep from mould in order to improve it, being provided with for example thick on outer peripheral face is fluororesin layers such as the PTFE of 10-50 micron or PFA.
The rotation of the both ends of fixing roller 1 freely is bearing on the not shown unit frame, is assembled support, by not shown drive system, drives with the rotation of regulation peripheral speed along the clockwise of arrow.
By being close to of 2 pairs of fixing rollers 1 of backer roll, elastic layer 2b with the portion of the being close to elastic deformation of fixing roller 1, and fixing roller 1 between form photographic fixing bite N as the Rack of material-to-be-heated heating part.In this example, backer roll 2 load stagnation pressures are about 304N (about 30Kg is heavy), and the interlock width of the photographic fixing bite N of this moment is about 6mm.Backer roll 2 is along with the rotation of fixing roller 1 drives, and is close to the driven rotation of friction force with photographic fixing bite N.Stagnation pressure, interlock width only are examples, also can be other values.
The 9th, as the inductive coil device of flux production part, constitute by inductive coil 3, magnetic core 4 and coil former 5 etc.The nappe that constitutes with thermotolerance materials such as polyimide, polyamide-imides covers inductive coil 3.Coil former 5 is that the xsect that is made of heat-resistant resins such as PPS, PEEK, phenol resin is the parts of semiellipse type, accommodate the inductive coil 3 that is rolled into ship shape in the inboard of coil former 5 and with thick for the dull and stereotyped ferrite of the 4mm magnetic core 4 of synthetic T type carefully, as inductive coil device 9.It is relative with the inside surface of fixing roller 1 that the outside of coil former 5 is configured to.In addition, inductive coil 3 is close on the coil device 9.
Inductive coil device 9 remains in the stilt 6 and inserts the hollow bulb of fixing roller 1, and the semicircle cambered surface side of coil former 5 becomes downward posture, and the both ends of stilt 6 fixedly are supported on the not shown fixation unit frame.Configuration inductive coil device 9 makes between inductive coil device 9 and the fixing roller 1 gapped.
The following describes the heating action.
Rotation drives fixing roller 1, and backer roll 2 driven rotations apply the alternating voltage of 10-100KHz to inductive coil 3 from field circuit 11.In inside surface, flow through eddy current by the magnetic field of alternating current induction, produce Joule heat as the fixing roller 1 of conductive layer.That is, the induction heating fixing roller 1.
By being configured to be docked at the temperature that the lip-deep electroregulator equitemperature of fixing roller sensor 7 detects fixing roller 1, to control circuit 12 input detected temperatures information (detection signal).Control circuit 12 is according to the detected temperatures information of input, and increase and decrease power supply of 3 from field circuit 11 to inductive coil makes the surface temperature of fixing roller 1 become the steady temperature of regulation, that is, the temperature automatic temperature-control of photographic fixing bite N is to the fixing temperature of regulation.
In addition, at rotation fixing roller 1, backer roll 2, induction heating fixing roller 1 and temperature adjustment are under the state of set point of temperature, carry the recording materials P of not photographic fixing toner image t to 8 guidings of carrying guide rail, import clamping carrying in back among the photographic fixing bite N, heat by fixing roller 1 and interlock are pressed, with not photographic fixing toner image t hot pressing photographic fixing on recording materials P face.The recording materials P that separates and discharge carrying output photographic fixing bite N from the face of fixing roller 1.10 for butt joint in the recording materials outlet side of photographic fixing bite N or near the recording materials disengaging pawl of the surface configuration of fixing roller 1.
In order to increase the heating of fixing roller 1, increase the number of turn of inductive coil 3, and the material that uses ferrite, the contour magnetic susceptibility low-residual of permalloy magnetic flux density also can improve the frequency of alternating current as magnetic core 4.
The temperature that inductive coil 3 is described is because of the high situation of air layer inner space temperature of 1 of coil self-heating geometric ratio coil former 5 and fixing roller.In the present invention, inductive coil and coil former 5 are close to, and the heat of inductive coil 3 at first is transmitted to coil former 5.Because be gas blankets such as air layer around the coil former 5, so the heat conduction from coil former 5 to gas blanket is considerably less.But, because thermograde coil former 5 is than the temperature height of inner space, thus from coil former 5 to inner space radiation heat.Heat from the solid to the air layer moves also big to thermal-radiating influence than heat conduction.Therefore, the heat of inductive coil 3 is delivered to coil former 5, from coil former 5 radiation heat, so along with the temperature of inductive coil 3 rises, the temperature of inner space rises.The present invention is conceived to this point, utilizes radiation heat by fixing roller 1, can effectively apply flexibly energy.Particularly, carry out the black processing of blacking fixing roller inside surface.By carrying out the black processing, increase the amount of heat absorption of inner space.
Here, simple declaration improves thermal absorptivity by blackization.
Be positioned at the absorption of body surface, the most desirable object of infra-red-emitting is a black matrix.Dividing absorptivity in all wavelengths is that 1 object sends the highest heat emission of its temperature, and this object is called black matrix.
All radianies of the black matrix of all radiant/uniform temps of radiance (ε)=subject
The radiance of black matrix is 1, and the radiance of subject is the value between 1 and 0.Known, usually, the radiation of heat rate equals the absorptivity of heat.
Therefore, in order to improve the absorptivity of heat, the essential radiation of heat rate that improves.Therefore, can improve the absorptivity of heat near black matrix.
The present invention carries out the black processing in order to improve the absorptivity of heat at the inside surface of fixing roller 1.As an example of black processing, for example in the method for the inside surface painting black coating of fixing roller 1.Preferably carry out the black processing among the present invention, make thermal emissivity rate greater than 0.9.The assay method of thermal emissivity rate is described here.
The device that uses uses the analyzer of the AR1000 series of the upright gauge Co., Ltd. of peace system.Utilize this device, when measuring radiance object surface temperature, measure, come the thermal emissivity rate of determination object thing according to both temperature differences with noncontact mensuration mode with the contact measurement mode.Measuring under the situation of surface temperature with noncontact,, in the darkroom, measuring though consider the trickle infrared ray influence that causes by external cause.In addition, for the surface temperature of object, temperature is high more, and precision is high more, and the surface temperature under the contact mensuration situation is 100 ℃.For the environment temperature of measuring, for data deviation is suppressed to Min., be that 23 ℃, humidity are to measure under 50% the environment in room temperature.Measure number of times and measure for carrying out 10 times, its mean value is the thermal emissivity rate of object.
Second embodiment
Second embodiment is identical with first embodiment basically, but handles the inside surface of fixing roller 1 with sand paper or sand blower, and the surface reaches Rz=1 micron-100 micron, afterwards, the black coating is carried out on the surface.
In the present embodiment, by the blasting treatment of fixing roller, it is big that surfaceness becomes, and the part area that absorbs heat becomes big, so improved thermal absorptivity.
In the present invention, except that surfaceness became greatly, by blackization, it is big that the surface area of fixing roller inside surface becomes, and absorbs the heat of inner space easily.Thus, add hot media and absorb the heat that more multi-thread circle heats up, when effectively applying flexibly coil intensification heat, can subdue raising and add the power of hot media temperature, so can be further energy-conservation.
The 3rd embodiment
In the present embodiment, in the inside surface of black fixing roller,, increase the radiations heat energy that is radiated the inner space from coil former 5 by improving the processing of coil former 5 emissivities.
Wherein, the relation of the radiance of the coil former of representing with Fig. 35 and coil temperature illustrates the relation of radiance and coil temperature.Coil temperature in this graph of a relation under the structure of above-mentioned fuser when at the appointed time the temperature temperature adjustment to 200 of fixing roller being spent the coil temperature convergency value.As we know from the figure, when radiance greater than 0.65 the time, it is big that the temperature of inductive coil 3 reduces tendency.Therefore, the radiance of coil former 5 is more preferably greater than 0.65.At this moment, radiation temperature sloping portion only in the inner space of fixing roller.
Below, actual heat from coil former 5 radiation is described.Fig. 4 represents the relation of coil former 5 coil former surface temperature and radiate heat in be untreated thing and black handled thing.The length of coil former 5 is 310mm, and the cross section is the semicircle about radius 15mm, and the radiance under the situation that is untreated is about 0.25, and the radiance after the black processing is about 0.95.
As shown in Figure 4, when the coil former surface was 200 ℃ of left and right sides in actual serviceability temperature, the radiant quantity of the thing that is untreated was about 12W, and the object radiation amount after the black processing is about 45W, and is hotter to the radiation of fixing roller inside surface.
This also can understand from Shi Difen, the Boltzmann rule of expression radiations heat energy.Here, so-called Shi Difen, Boltzmann rule are expressed as follows:
E......: total spoke heat (W)
E (T): the blackbody radiation heat (W/m2) under the absolute temperature T
S: thermal-radiating material surface amasss (m2)
T: absolute temperature (K)
σ: Shi Difen, Boltzmann constant (W/ (m2K4)
ε: the material thermal emissivity rate of radiation
Radiations heat energy e (T) is e (T)=σ T4
By thermal emissivity rate ε, surface area S total radiation energy E is expressed as E=ε Se (T).
Therefore, thermal emissivity rate ε is high more as can be known, and radiations heat energy is big more.
As can be seen from Figure 4, the radiance of coil former 5 rises to 0.95, the poor approximately 33W of radiate heat from 0.25.Therefore, the radiance of coil former 5 becomes big as can be known, and the inside surface of fixing roller absorbs more heat.
In the present embodiment, black coil former 5, it is big that surfaceness becomes, many from the radiation thermal change of coil former 5.
Embodiments of the invention more than have been described, but have the invention is not restricted to the foregoing description, in technological thought of the present invention, can carry out various distortion.
Claims (15)
1. a fixing device (106) has:
Produce the coil (3) in magnetic field;
Heater block (1), be included in the inboard and have the conductive layer of described coil (3), produce eddy current by the magnetic field that electric current produced in described coil (3), flow through, thereby in described conductive layer, produce heat, by heat photographic fixing photographic fixing toner picture not on recording materials; Wherein
The inside surface of described heater block (1) is a black, and and described coil (3) between gapped.
2. according to the fixing device of claim 1, the inside surface of wherein said heater block (1) has the radiance more than or equal to 0.9 bringing into use described fixing device (106) before, and this is by the black realization.
3. fixing device according to claim 1, wherein, the face relative with described heater block (1) is black.
4. fixing device according to claim 1, wherein, the surfaceness R of the inside surface of described heater block (1)
zMore than or equal to 1 μ m smaller or equal to 100 μ m.
5. fixing device according to claim 1, wherein, the radiance of the face relative with described heater block (1) is more than or equal to 0.65.
6. fixing device according to claim 1, wherein, the radiance of the face relative with described heater block (1) is more than or equal to 0.95.
7. fixing device according to claim 1, wherein, described fixing device (106) uses with image processing system, and this image processing system has:
The image bearing member (101) of carrying electrostatic image;
The imagescope (104) of toner is provided to electrostatic image;
Toner on the described image bearing member (101) is transferred to transfer printing device (105) on the recording materials.
8. a fixing device (106) has:
Produce the coil (3) in magnetic field;
Heater block (1), be included in the inboard and have the conductive layer of described coil (3), produce eddy current by the magnetic field that electric current produced in described coil (3), flow through, thereby in described conductive layer, produce heat, by heat photographic fixing photographic fixing toner picture not on recording materials;
Coil former (5) is arranged between described coil (3) and the described heater block (1) and with described heater block (1) and has the gap;
Wherein said coil former (5) is close to described coil (3), and the inside surface of described heater block (1) is a black.
9. fixing device according to claim 8, wherein, the face relative with described heater block (1) is black.
10. fixing device according to Claim 8, the inside surface of wherein said heater block (1) has the radiance more than or equal to 0.9 bringing into use described fixing device (106) before, and this is by the black realization.
11. fixing device according to claim 8, wherein, the surfaceness Rz of the inside surface of described heater block (1) more than or equal to 1 μ m smaller or equal to 100 μ m.
12. fixing device according to claim 8, wherein, the radiance on described coil former (5) surface relative with described heater block (1) is more than or equal to 0.65.
13. fixing device according to claim 8, wherein, the radiance on described coil former (5) surface relative with described heater block (1) is more than or equal to 0.95.
14. fixing device according to claim 8, wherein, the surfaceness of the inside surface of described heater block (1) is more than or equal to 1 μ m and smaller or equal to 100 μ m.
15. fixing device according to claim 8, wherein, described fixing device (106) uses with image processing system, and this image processing system has:
The image bearing member (101) of carrying electrostatic image;
The imagescope (104) of toner is provided to electrostatic image;
Toner on the described image bearing member (101) is transferred to transfer printing device (105) on the recording materials.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP311551/2001 | 2001-10-09 | ||
| JP2001311551 | 2001-10-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1493939A CN1493939A (en) | 2004-05-05 |
| CN1278195C true CN1278195C (en) | 2006-10-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02154737 Expired - Fee Related CN1278195C (en) | 2001-10-09 | 2002-10-09 | Fixing apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN1278195C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100648309B1 (en) | 2004-09-11 | 2006-11-23 | 삼성전자주식회사 | Fixing apparatus of the image forming apparatus |
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2002
- 2002-10-09 CN CN 02154737 patent/CN1278195C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1493939A (en) | 2004-05-05 |
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Granted publication date: 20061004 Termination date: 20171009 |