JP6424010B2 - Heater, fixing device including the same, image forming apparatus, heating device, and heater manufacturing method - Google Patents

Description

  The present invention relates to a heater, a fixing device including the heater, an image forming apparatus, a heating apparatus, and a heater manufacturing method. More specifically, the present invention relates to a heater having a plurality of resistance heating wirings that generate heat when energized, the resistance value of each resistance heating wiring being corrected, a fixing device including the same, an image forming apparatus and a heating apparatus, and a heater manufacturing method.

As a heating means for performing heat treatment of an object, a heater in which a resistance heating wiring is provided on the surface of a stainless steel plate or a ceramic plate is known. Since such a heater can be formed thin and compact, for example, it is incorporated in a copying machine or a printer to fix toner or ink on a recording medium, or incorporated in a dryer to cover a panel or the like. It is used for the purpose of heating and drying the processed body uniformly. In these applications, a heater is known that divides the heat generating surface of the heater into a plurality of heat generating portions (cells) so that the temperature distribution in the surface to be heated is as uniform as possible (for example, Patent Documents). 1).
On the other hand, in the manufacture of the heater as described above, there is a difference in the resistance value and the like of the resistance heating element to be formed. Therefore, it is necessary to adjust the resistance value in order to obtain a high-quality heater (for example, Patent Documents). 2).

WO2014 / 034744 JP 2001-313154 A

Patent Document 1 includes a plurality of resistance heating wirings (cell patterns) laid using a conductive material whose resistance value changes depending on temperature, and the resistance heating wirings are electrically connected in parallel. A heater is described. According to this heater, since each resistance heating wiring has substantially the same heat generation characteristics, the heat generation by the respective cell pattern portions (heat generation portions) is almost the same, and the heated object can be heated almost uniformly. Become.
However, in the manufacture of the heater as described above, it is difficult to uniformly form the resistance heating wiring of each heating portion. Therefore, in order to make the heating characteristics uniform over the entire heating area, It was necessary to adjust the resistance value. Patent Document 2 describes an invention in which a resistance value is adjusted by forming a conductive layer on a resistor pattern. However, in a heater or the like provided with a plurality of heat generating portions as described above, the wiring pattern of the resistance heat generating wiring is made finer. On the other hand, with the diversification of heater shapes and dimensions, it has become increasingly difficult to accurately form resistance heating wiring over the entire heating area by printing or the like. For example, when the heating area of the heater is a curved surface, the resistance heating wiring can be formed using a so-called cylindrical printing technique or the like, but it is possible to form a highly accurate resistance heating wiring over the entire heating area. It is extremely difficult. For this reason, there is a demand for a heater that can be manufactured by a simpler process with higher productivity and that has more uniform heat generation characteristics of a plurality of heat generating portions.

  The present invention has been made in view of the above circumstances, and in a heater configured by connecting a plurality of heat generating portions on a heat generating surface and connecting resistance heating wires laid for each heat generating portion in parallel, each resistance It is an object of the present invention to provide a heater in which the heat generation characteristics of the heat generation wiring are corrected with high accuracy, a fixing device including the heater, an image forming apparatus and a heating apparatus, and a heater manufacturing method.

The present invention is as follows.
The heater according to claim 1 is a heater including a plurality of heat generating portions disposed on a base, and is provided with two power feedings made of a conductive material that is separated for each of the heat generating portions and separated from each other. Wiring for connecting each of the power supply wirings using a resistance heating material , and having a plurality of main pattern portions and connection pattern portions for connecting the main pattern portions in series. When the resistance value between both ends of the resistance heating wiring measured after the wiring is greater than a predetermined range for one resistance heating wiring and each of the heating portions, one point of the resistance heating wiring and the power supply One or more correction bridges that connect the wirings with a conductive material, and one power supply wiring of each of the heat generating portions and the other power supply wiring that connects the other power supply wirings with a conductive material. Prepare The the gist.
As a reference, the correction bridge can be formed by connecting the resistance heating wires.
Further, the correction bridge can be formed so as to overlap the line of the resistance heating wiring.
The heater according to claim 2, in claim 1, at least two of said correction bridge, a point of the same length from each end of the resistance heating wire, connecting the power supply wire of each end side respectively This is the gist.
According to a third aspect of the present invention , the heater according to the first or second aspect is configured to sweep the at least one of the heated object and the main heater in a predetermined sweep direction while facing the heated object. Each of the heat generating portions is arranged in a direction orthogonal to the sweep direction, and in each of the heat generating portions, the resistance heating wiring is within a predetermined range with respect to the orthogonal direction. The gist is to include a plurality of main pattern portions provided at an angle.
According to a fourth aspect of the present invention, there is provided the heater according to the third aspect , wherein the cross-sectional shape of the substrate in the sweep direction is a circular arc shape that is convex on the opposite side to the object to be heated around an axis orthogonal to the sweep direction. The gist is that each of the heat generating portions is disposed on the convex surface or on the opposite surface.
According to a fifth aspect of the present invention , in the heater according to any one of the first to fourth aspects, the resistance heating material is a conductive material whose resistance value changes depending on temperature, and the conductive material used for the correction bridge and the power supply bridge. The gist is that the material is a conductive paste.

A gist of a fixing device according to a sixth aspect includes the heater according to any one of the first to fifth aspects.
A gist of an image forming apparatus according to a seventh aspect is that the heater according to any one of the first to fifth aspects is provided.
A gist of a heating apparatus according to an eighth aspect is that the heater according to any one of the first to fifth aspects is provided.

The method for manufacturing a heater according to claim 9 is a method for manufacturing a heater including a plurality of heat generating portions arranged on a base, wherein the two power supplies are separated for each of the heat generating portions and separated from each other. Forming a wiring for power supply using a conductive material, and in each of the heat generating portions, a plurality of main pattern portions and a connection pattern portion for connecting the main pattern portions in series, and resistance heating A resistance heating wiring forming step of forming one resistance heating wiring so as to connect each of the power feeding wirings using a material, and after the power feeding wiring and the resistance heating wiring are formed, A measuring step for measuring the resistance value between the power supply wirings for the heat generating portion, and a calculation means for comparing the resistance value measured by the measuring step for each of the heat generating portions with a predetermined range. The value is When exceeding a predetermined range, a calculation step for obtaining a length that substantially shortens the resistance heating wiring in order to correct the resistance value to the predetermined range as a correction length; and a length of the resistance heating wiring A correction bridge forming step of forming one or more correction bridges connecting one point of the resistance heating wiring and the power supply wiring with a conductive material so as to be shortened by the correction length; A power supply bridge forming step of forming a power supply bridge for connecting the power supply wirings and the other power supply wirings with a conductive material.
As a reference, the correction bridge can be formed by connecting the resistance heating wires.
Further, the correction bridge can be formed so as to overlap the line of the resistance heating wiring.
Method for producing a heater according to claim 10, in claim 9, the prior SL correction bridge forming step, at least two of said correction bridge, a point of the same length from each end of the resistance heating wire, each end The gist of the present invention is to connect the power supply wiring on the side.
A heater manufacturing method according to an eleventh aspect of the present invention is the method for manufacturing a heater according to the ninth or tenth aspect , wherein at least one of the heated object and the heater is swept in a predetermined sweep direction while facing the heated object. A method of manufacturing a heater for heating an object to be heated, wherein each of the heat generating parts is arranged in a direction orthogonal to the sweep direction, and the resistance heat generation is performed in each of the heat generating parts by the resistance heating wiring forming step. The gist is that the wiring is formed to include a plurality of main pattern portions provided at an angle within a predetermined range with respect to the orthogonal direction.
A method for manufacturing a heater according to a twelfth aspect of the present invention is the method of manufacturing a heater according to the eleventh aspect , wherein the cross-sectional shape of the base in the sweep direction is convex on the side facing the object to be heated with an axis orthogonal to the sweep direction as a center. It has an arc shape, and each heat generating portion is arranged on the convex surface or on the opposite surface.
A heater manufacturing method according to a thirteenth aspect of the present invention is the heater manufacturing method according to any one of the ninth to twelfth aspects, wherein the resistance heating material is a conductive material whose resistance value changes depending on temperature, and the correction bridge and the power supply bridge. The gist of the present invention is that the conductive material used in is a conductive paste.

  According to the heater of claim 1, since the resistance value of the resistance heating wiring laid for each heating portion is corrected by the correction bridge, the heating characteristics of all the heating portions are made uniform with high accuracy, and the object to be heated Can be heated uniformly. Further, since only a correction bridge is provided for correcting the resistance value, it can be manufactured by a simple process regardless of the shape of the heater. Even if it is difficult to accurately form the resistance value of the heat generating part in the manufacture of the heater product, if the resistance heating wiring is formed so that the resistance value of at least all the heat generating parts exceeds the specified value, By correcting each heat generating portion with a correction bridge, the quality and yield of the product can be greatly improved.

According to the heater of the second aspect, a correction bridge can be provided at an appropriate portion according to the wiring pattern of each heat generating portion, the correction value of the resistance value, the shape of the heater, and the like.
According to the heater of the third aspect , the object to be heated that is swept relative to the heater can be uniformly heated regardless of the size of the object to be heated. Further, since the main pattern portion of the resistance heating wiring is provided in a direction orthogonal to the sweep direction or a direction close thereto, the object to be heated can be efficiently heated.
According to the heater of the fourth aspect , it is possible to provide a heater suitable for incorporation into the roller in an application in which the object to be heated is swept and heated by the roller.
According to the heater of the fifth aspect , it is possible to obtain an effect that the heat generation state is autonomously uniformized between the heat generation units and the heat generation units. Further, the correction bridge and the power supply bridge can be manufactured by a simple method.

According to the method for manufacturing a heater according to claim 9 , even if a difference occurs in the resistance value of each formed resistance heating wiring, if the resistance value exceeds a predetermined range, the resistance value is reduced by providing a correction bridge. Since the correction is made, the heat generation characteristics of all the heat generating portions can be made uniform with high accuracy, and it becomes possible to manufacture a heater that uniformly heats the object to be heated. In addition, a correction length is obtained by measuring the resistance value, and a correction bridge is provided so as to shorten the correction length. Therefore, regardless of the shape of the heater, a simple manufacturing method is used and the heater is inexpensive. Can be manufactured.
According to the heater manufacturing method of the tenth aspect , a correction bridge can be provided at an appropriate portion according to the wiring pattern of each heat generating portion, the correction value of the resistance value, the shape of the heater, and the like.
According to the heater manufacturing method of the eleventh aspect , it is possible to manufacture a heater capable of uniformly heating an object to be heated that is swept relative to the heater regardless of the size of the object to be heated. In addition, since the main pattern portion of the resistance heating wiring is provided in a direction orthogonal to or near the sweep direction, a heater capable of efficiently heating an object to be heated can be manufactured.
According to the heater manufacturing method of the twelfth aspect , it is possible to manufacture a heater suitable for incorporation into a roller in an application in which an object to be heated is swept and heated by a roller. Even if it is difficult to form each resistance heating wiring with high accuracy over the entire surface of the heat generation area because the heat generation area of the heater is a curved surface, a heater with uniform heat generation characteristics can be obtained by appropriately forming a correction bridge. Can be manufactured.
According to the heater manufacturing method of the thirteenth aspect , it is possible to manufacture a heater in which the heat generation state is autonomously uniformized between the heat generation portions and the heat generation portions. Further, the correction bridge and the power supply bridge can be provided by a simple method.

It is a typical top view showing the composition of the heater concerning the present invention. It is a typical top view showing the state by which the wiring for electric power feeding and resistance heating wiring were given on the base | substrate of a heater. It is a typical top view for demonstrating the arrangement | positioning method of a correction bridge. It is a typical top view showing the example by which a correction bridge is arrange | positioned at all the heat-emitting parts. It is a typical top view of an example of a heater. It is a typical top view of other examples of a heater. It is a typical top view of other examples of a heater. It is a figure for demonstrating the heater which sweeps and heats a to-be-heated material to one sweep direction. It is a typical top view for demonstrating the wiring pattern of resistance heating wiring. It is the schematic perspective view (a) and sectional drawing (b) showing the example which provides a heat generating part on the convex surface of a heater with a circular arc cross section. It is the schematic perspective view (a) and sectional drawing (b) showing the example which provides a heat generating part on the concave surface of a heater with a circular arc cross section. It is a typical top view showing the example of arrangement | positioning of the terminal for electric power feeding provided on the base | substrate of a heater. It is a schematic perspective view showing an example of a fixing device using this heater. It is a schematic perspective view showing the other example of the fixing device using this heater. It is the schematic showing an example of the image forming apparatus which uses this heater. It is a typical top view for demonstrating the manufacturing method of the heater which concerns on this invention, (a) is formation of wiring for electric power feeding, (b) is formation of resistance heating wiring, (c) is formation of a correction bridge, (D) represents the formation of a feeding bridge. It is a top view of the heater which concerns on an Example. It is a graph which shows the temperature distribution by the position on a base | substrate of the heater which concerns on an Example.

Hereinafter, the present invention will be described in detail with reference to the drawings.
[1] Heater A heater (1) according to this embodiment is a heater including a plurality of heat generating portions (10) disposed on a base (11) as shown in FIG.
Two power supply wirings (13 (13a, 13b)) made of a conductive material that is separated for each heat generating portion (10) and separated from each other;
In each heating part (10), a resistance heating wiring (12) wired so as to connect the power feeding wirings (13a, 13b) using a resistance heating material;
For each heat generating part (10), when the resistance value between both ends of the resistance heating wiring (12) measured after the wiring exceeds a predetermined range, the resistance heating wiring (12) 12) one or more correction bridges (14) connecting at least one of the points between 12) and the power supply wiring (13) with a conductive material;
A power supply bridge (15) for connecting one power supply wiring (13a) and the other power supply wiring (13b) of each heat generating section (10) with a conductive material;
It is characterized by providing.
In addition, a power supply terminal (131 (131a, 131b)) for supplying power to the heater 1 from the outside can be provided on the base (11). Moreover, in order to protect each said wiring and each bridge | bridging, the protective layer and topcoat layer which consist of insulating materials can be laminated | stacked and provided.

The “base (11)” is a substrate that supports the electric circuit of the heater 1 including the resistance heating wiring 12, the power supply wiring 13, the correction bridge 14, the power supply bridge 15, the power supply terminal 131, and the like.
The “heat generating portion (10)” is an electric circuit including one resistance heating wiring 12 and two power supply wirings 13 (13a, 13b) connected to each end thereof, or a base on which the electric circuit is disposed. 11 refers to the top section. For example, the heat generating surface (heat generating region) of the heater 1 shown in FIG. 1 includes six heat generating portions 10, and the electric circuit is provided for each heat generating portion 10. The number of heating parts 10 and the partitioning method are not particularly limited. In FIG. 1, each heating unit 10 is partitioned so as to be inclined with respect to the long side direction of the base 11, but may be partitioned in a direction orthogonal to the long side direction. Further, in this example, the plurality of heat generating units 10 are arranged in one row in the lateral direction of the base body 11, but may be arranged in two or more rows, or may be arranged in a matrix form in the vertical and horizontal directions.

Although the dimension and shape of the base body 11 are not particularly limited, the thickness is preferably 0.1 to 20 mm according to the material and dimensions of the base body 11, for example.
The material of the substrate 11 is not particularly limited as long as it can support an electric circuit formed on the surface of the substrate 11 to generate heat. As the substrate 11, for example, metal, ceramics, and composite materials thereof can be used. When a conductive material such as metal is used, the base 11 can be configured by providing an insulating layer (not shown) on the conductive material, and the electric circuit is formed on the insulating layer.

Examples of the metal used for the substrate 11 include steel, and stainless steel can be preferably used. The kind of stainless steel is not particularly limited, and ferritic stainless steel and / or austenitic stainless steel is preferable. Further, among these stainless steels, varieties excellent in heat resistance and / or oxidation resistance are particularly preferable. For example, SUS430, SUS436, SUS444, SUS316L, etc. are mentioned. These may use only 1 type and may use 2 or more types together.
Moreover, aluminum, magnesium, copper, and alloys of these metals can be used as the metal constituting the substrate 11. These may be used alone or in combination of two or more. Among them, aluminum, magnesium, and alloys thereof (aluminum alloy, magnesium alloy, Al—Mg alloy, etc.) have a small specific gravity, and thus the weight of the heater can be reduced by adopting them. Moreover, since copper and its alloy are excellent in thermal conductivity, the heat uniformity of this heater can be improved by adopting them.

As described above, when a conductive material is used as the substrate material, the base 11 is configured by providing an insulating layer on the conductive material. The material of the insulating layer is not particularly limited as long as it can achieve electrical insulation between the conductive material and the electric circuit provided on the substrate 11 and between the wirings of the electric circuit. In the case where a metal (such as stainless steel) is used as the substrate material, the insulating layer material is preferably glass, more preferably crystallized glass or semi-crystallized glass, from the viewpoint of its thermal expansion balance. _{Specifically,} SiO ₂ -Al ₂ O 3 -MO-based glass is preferred. Here, MO is an alkaline earth metal oxide (MgO, CaO, BaO, SrO, etc.). Although the thickness of an insulating layer is not specifically limited, It is preferable that it is 60-120 micrometers.

  Further, when the base body 11 is made of ceramics, it is preferable that the electrical insulation between the electrical circuit provided on the base body 11 and the wiring of the electrical circuit can be maintained at a high temperature. Examples of such ceramics include aluminum oxide, aluminum nitride, zirconia, silica, mullite, spinel, cordierite, and silicon nitride. These may use only 1 type and may use 2 or more types together. Of these, aluminum oxide and aluminum nitride are preferred. Moreover, SiC / C, SiC / Al, etc. are mentioned as a composite material of a metal and ceramics. These may use only 1 type and may use 2 or more types together.

The “feeding wiring (13)” includes two wirings (13a, 13b) formed using a conductive material in order to supply power to the resistance heating wiring (12) laid on each heating unit 10. Land. The shape and dimensions of each power supply wiring 13 are not particularly limited. The two power supply wirings (13 a, 13 b) are provided to be electrically separated for each heating unit 10. The two power supply wirings (13a, 13b) are provided separately from each other, and power is supplied between them.
The part on the base 11 on which the power supply wiring 13 is provided and the wiring pattern of the power supply wiring 13 are not particularly limited as long as power can be supplied to both ends of the resistance heat generation wiring (12) provided in each heat generating portion 10. For example, as shown in FIG. 1, in each heat generating portion 10, one of the power supply wirings 13 a is disposed at one end on the base 11, and the other of the power supply wirings 13 b is the other on the base 11. It can be arranged at the end of the. In addition, when the plurality of heat generating portions 10 are arranged on the base 11 in two or more rows or in a matrix shape, the power supply wiring 13 is appropriately provided corresponding to the arrangement of the heat generating portions 10. Can do.

  The “resistance heating wiring (12)” is a wiring formed using a resistance heating material so as to connect the two power supply wirings 13 (13a, 13b), and generates heat corresponding to the resistance value by energization. be able to. The type of the resistance heating material used for the resistance heating wiring 12 is not particularly limited. Examples of the resistance heating material include silver, copper, gold, platinum, palladium, rhodium, tungsten, and molybdenum. These may use only 1 type and may use 2 or more types together. When using 2 or more types together, it can be set as an alloy. More specifically, a silver-palladium alloy, a silver-platinum alloy, a platinum-rhodium alloy, silver, copper, gold, or the like can be used.

  In addition, the resistance heating material constituting the resistance heating wiring 12 has a positive resistance temperature in order to exert a self-temperature balancing action (self-temperature complementing action) in each heating part 10 and between the plurality of heating parts 10. It is preferable to have a coefficient. For example, the temperature coefficient of resistance at 0 to 1000 ° C. is preferably 500 to 4400 ppm / ° C. In particular, when Ag or Ag—Pd is used as the resistance heating material, the temperature coefficient of resistance at 0 to 600 ° C. is preferably 500 to 4000 ppm / ° C. Moreover, when using Mo and / or W as a resistance heating material, it is preferable that the resistance temperature coefficient in 0-1000 degreeC is 2000-4000 ppm / degreeC.

As described above, when the resistance heating wiring 12 is formed using a resistance temperature-dependent material, the self-temperature balancing action is achieved in each heating part 10 and between the heating parts 10. Can play.
For example, when the temperature of one heat generating portion 10 decreases, the resistance value of the resistance heat generating wiring 12 of the heat generating portion 10 also decreases. Since the plurality of heating portions 10 are electrically connected in parallel, when the resistance value of the resistance heating wiring 12 of one heating portion 10 decreases, the amount of current flowing through the resistance heating wiring 12 increases. The heating value of 10 will increase. In this way, the plurality of heat generating units 10 are individually self-balanced to a steady state.
Further, for example, when there is the second heat generating unit 10 sandwiched between the first heat generating unit 10 and the third heat generating unit 10, when the temperature of the second heat generating unit 10 decreases, the heat is transferred to the first and second surroundings. 3 will be compensated from the heat generating part 10 of 3. If it does so, the electric current to the 1st heat_generation | fever part 10 and the 3rd heat_generation | fever part 10 which temperature fell will increase, and the effect | action which tries to recover | recover the temperature drop by the deprived heat will work. That is, the heat generating part 10 around the second heat generating part 10 behaves so as to complement the temperature decrease of the second heat generating part 10.
In this way, the heater is autonomously controlled so as to generate heat uniformly throughout the plurality of heat generating units 10. In view of this action, the base 11 is preferably made of a metal having excellent thermal conductivity as well as thermal shock resistance.

The dimensions (wiring width, length, thickness) and shape (wiring pattern) of the resistance heating wiring 12 are not particularly limited, and can be appropriately determined according to the electrical resistivity of the resistance heating material to be used and the required resistance value. That's fine.
In order to make each heat generating portion 10 have substantially the same heat generation amount, the resistance heating wiring 12 in each heat generating portion 10 may be formed so as to have substantially the same resistance value. In that case, as shown in FIG. 1, the resistance heating wiring 12 of each heating part 10 can be formed with the same line length, line width, and thickness and with the same wiring pattern. FIG. 2 shows a state in which such resistance heating wiring 12 is formed on the substrate 11 together with the power supply wiring 13. In addition, having substantially the same calorific value means that each heat generating part 10 has substantially the same resistance temperature coefficient and resistance value under the same measurement conditions. For example, the difference in resistance temperature coefficient between the heat generating portions can be within ± 20%, and the difference in resistance value between the heat generating portions can be within ± 10%.

In addition, even if the resistance heating wiring 12 adopts a wiring pattern that differs depending on the heating section 10, the heating amount (resistance value) of each heating section 10 can be made substantially the same. Furthermore, even if different resistance heating materials are used depending on the parts in the heating part 10 or different line width / line length or wiring pattern is adopted, the heating amount (resistance value) of the heating part 10 is substantially the same. can do.
Further, even when each heat generating part 10 is intentionally made to have a different heat generation amount, the resistance heat generation material, dimensions, wiring pattern, etc. of the resistance heat generation wiring 12 are appropriately selected according to the desired heat generation amount as described above. can do.

  The resistance heating wiring 12 can be wired in an arbitrary pattern. In FIG. 1, the wiring pattern of the resistance heating wiring 12 in each heating part 10 is laid so as to connect a plurality of main pattern parts laid in parallel to the long side of the base 11 and each main pattern part in series. And a connection pattern portion. This wiring pattern can be variously modified. For example, the main pattern portions do not have to be parallel to the sides of the base 11, and the main pattern portions do not have to be parallel to each other. Further, all or some of the main pattern portions may be connected in parallel. Further, the connection pattern portion is not limited to a straight line as in this example, but may be a curved line. Also, a wiring pattern in which each main pattern portion is connected in a zigzag shape can be adopted.

  The “correction bridge (14)” has a resistance value between both ends of the resistance heating wiring 12 (that is, between the power supply wirings 13a and 13b) between the two power supply wirings 13 in each heat generating portion 10. When it exceeds a predetermined range, it is a short-circuit wiring provided to reduce the resistance value within the predetermined range. The resistance value can be reduced by substantially shortening the length of the resistance heating wiring 12. The shortened length is called “correction length” (L). The “predetermined range” can be arbitrarily set (described later). Needless to say, when the resistance value of the resistance heating wiring 12 is within a predetermined range, it is not necessary to provide the correction bridge 14.

  As the correction bridge 14, a conductive material is used. The conductive material may be a metal or other conductive material (for example, the same material as the resistance heating wiring 12) as long as the correction length can be short-circuited. Preferably, a conductive paste such as a silver paste can be used as the correction bridge 14. The conductive paste is not limited to silver, and may include gold, copper, nickel, molybdenum, tungsten, and the like.

The number of the correction bridges 14 and the portions where the correction bridges 14 are provided are not limited as long as the substantial length of the resistance heating wiring 12 as a whole is shortened by the correction length L in each heat generating portion 10.
FIG. 3 shows an example of the arrangement of the correction bridge 14. The correction bridge 14 is configured so as to shorten the substantial length of the resistance heating wiring 12 between two points of the resistance heating wiring 12 and / or between one point of the resistance heating wiring 12 and the power supply wiring 13. It is provided to be connected (short-circuited) by one or more correction bridges.
In FIG. 9A, at least one correction bridge 141 is provided so as to connect one point of the resistance heating wiring 12 and the power supply wiring 13b. As a result, a section having a certain length is short-circuited from one end of the resistance heating wiring.
In FIG. 5B, at least one correction bridge 143 is provided so as to connect the resistance heating wirings 12. As a result, the two points of the resistance heating wiring 12 connected by the correction bridge 143 are short-circuited.
In FIG. 3C, at least one correction bridge 144 is provided so as to overlap the resistance heating wiring 12. As a result, the resistance heating wiring 12 between the two points on both ends of the correction bridge 144 is short-circuited.
In FIG. 6D, at least two correction bridges 142 are provided so as to connect a point having the same length from each end of the resistance heating wiring 12 and a power supply wiring (13a, 13b) on each end side. ing. As a result, sections of a certain length are short-circuited from each end of the resistance heating wiring 12. FIG. 4 shows an example in which each heating unit 10 is provided with two correction bridges 14 (142).
By appropriately providing the correction bridge 14 as described above, the length of the resistance heating wiring 12 can be substantially shortened by the correction length L.

The “power supply bridge (15)” is a power connection wiring that connects one power supply wiring 13a and the other power supply wiring 13b of each heat generating portion 10 using a low-resistance conductive material. . By forming the power supply bridge 15 between the heat generating units 10, all the heat generating units 10 (resistance heating wirings 12) are electrically connected in parallel. As the material for the power supply bridge 15, a conductive paste similar to the above, such as silver paste, can be used.
The correction bridge 14 and the power supply bridge 15 can be laminated on the power supply wiring 13 and the resistance heating wiring 12.

5 to 7 show examples of the heater 1 in which the resistance heating wiring 12 is provided by various wiring patterns. In any of the drawings, an electric circuit in a state where all the heat generating units 10 are connected in parallel by the power supply bridge 15 is shown.
The heater 1 in FIG. 5 is configured by a wiring pattern of the heat generating portion 10 similar to that in FIG.
In the heater 1 of FIG. 6, each heat generating portion 10 is provided perpendicular to the long side of the base 11, and the main pattern portions of the wiring pattern parallel to the long side of the base 11 are connected in series.
In the heater 1 of FIG. 7, the main pattern portions of the wiring pattern parallel to the long side of the base 11 are connected in parallel in each heat generating portion 10.
The configuration of the wiring pattern can be modified as appropriate.

  FIG. 8 shows a state in which at least one of the object to be heated 2 and the heater 1 is swept in a predetermined sweep direction D in a state where the heat generating surface of the heater 1 and the object to be heated 2 face each other. It is a figure explaining the heater to heat. In this case, the object to be heated 2 is swept relatively on the heater 1 in the direction D. What is necessary is just to select suitably the structure of the heat-emitting part 10 on the heater 1, and the wiring pattern of the resistance heating wiring 12, for example, it can comprise as represented to FIGS. In the heater 1 used in this way, the heat generating portions 10 are preferably arranged side by side in a direction orthogonal to the sweep direction D. Thereby, regardless of the width and position of the article to be heated 2, the self-temperature balancing action works effectively, so that the article to be heated 2 can be heated uniformly.

When the object to be heated 2 is swept relatively in the direction D, the main pattern portion of the resistance heating wiring 12 is provided in each heat generating portion 10 so as to be substantially orthogonal to the sweep direction D. Is preferred. FIG. 9 shows an example of such a wiring pattern of the resistance heating wiring 12. As shown in FIG. 5A, the resistance heating wiring 12 is provided so as to connect the main pattern portions 121 to a plurality of main pattern portions 121 provided at an angle θ within a predetermined range with respect to the orthogonal direction. The wiring pattern pattern 122 can be wired. The angle θ within the predetermined range may be, for example, −30 ° to 30 °, preferably −15 ° to 15 °. It is most preferable that the angle θ = 0 °, that is, the main pattern portion 121 is provided in a direction orthogonal to the sweep direction D. The main pattern portions 121 do not have to be parallel to each other, and the connection pattern portion 122 is not limited to be linear, but may be curved. In addition, the main pattern portions 121 may be electrically connected in series, or all or some of the main pattern portions 121 may be electrically connected in parallel. Further, as shown in FIG. 5B, the resistance heating wiring 12 can be a wiring pattern in which the main pattern portions 121 are connected in a zigzag shape.
As described above, by providing the main pattern portion of the resistance heating wiring 12 in a direction orthogonal to the sweep direction D or an angle θ within a predetermined range with respect to the orthogonal direction, the heated object 2 to be swept can be efficiently Can be heated.
In each heat generating portion 10, one of the power supply wirings (13 a) is disposed on one side of the orthogonal direction on the base 11, and the other of the power supply wirings (13 b) is the orthogonal direction on the base 11. It can be arranged on the other side.

  As described above, with the heating surface of the heater 1 and the object to be heated 2 facing each other, the object to be heated 2 and the heater 1 are relatively swept in a predetermined sweep direction D to heat the object to be heated 2. In the case of the heater 1, the cross-sectional shape of the base 11 in the sweep direction D is a circular arc shape that is convex on the side facing the object to be heated 2 with an axis orthogonal to the sweep direction D as the center (that is, a cylinder or a cylinder) Can be made into a shape cut by a plane parallel to the central axis. And each heat-emitting part 10 can be arrange | positioned on the said convex surface like FIG. Moreover, as shown in FIG. 11, it can also be arranged on the opposite surface (concave surface). By setting it as such a shape, the to-be-heated material 2 swept on a roll can be efficiently heated by attaching the heater 1 to a cylindrical roll and rotating a roll (refer FIG. 14). .

  In addition, power supply terminals 131 (131a, 131b) for connecting a power source from the outside can be provided on the base 11 of the heater 1. One power supply terminal 131a is connected to the power supply wiring 13a, and the other power supply terminal 131b is connected to the power supply wiring 13b. Since the power supply wirings 13 of all the heat generating units 10 are connected by the power supply bridge 15, the power supply terminals 131 may be connected to the power supply wiring 13 of at least one heat generating unit 10. The location of the power supply terminal 131 on the base 11 is not particularly limited, and for example, the power supply terminal 131 can be provided at a location as shown in FIGS.

  The heater 1 can be used as a fixing heater that is incorporated in an image forming apparatus such as a printing machine, a copier, or a facsimile, a fixing device, and the like, and fixes toner, ink, and the like on a recording medium. In addition, it can be used as a heating device that is incorporated in a heater and uniformly heats (e.g., drying or firing) a target object such as a panel. In addition, heat treatment of metal products, coating films formed on substrates of various shapes, heat treatment of coatings, and the like can be suitably performed. Specifically, heat treatment of paint films (filter constituent materials) for flat panel displays, paint drying of painted metal products, automobile-related products, woodwork products, electrostatic flocking adhesion drying, heat treatment of plastic processed products, printing It can be used for solder reflow of a substrate, printing drying of a thick film integrated circuit, and the like.

[2] Fixing Device A fixing device provided with the heater can be appropriately selected depending on the heating target, fixing means, and the like. For example, when fixing means including pressure bonding is used to fix toner or the like to a recording medium such as paper, or when a plurality of members are bonded together, fixing including a heating unit including a heater and a pressure unit It can be a device. Of course, it is possible to use a fixing means that does not involve pressure bonding. In the present invention, it is preferable that the fixing device 5 fix an unfixed image containing toner formed on the surface of a recording medium such as paper or film on the recording medium.
FIG. 13 shows a main part of the fixing device 5 disposed in the electrophotographic image forming apparatus. The fixing device 5 includes a rotatable fixing roll 51 and a rotatable pressure roll 54, and the heater 1 is disposed inside the fixing roll 51. The heater 1 is preferably arranged so as to be close to the inner surface of the fixing roll 51.
For example, like the fixing unit 5 shown in FIG. 15, the heater 1 is fixed inside a heater holder 53 made of a material that can conduct heat generated by the heater 1, and heat generated by the heater 1 is transferred to the fixing roll 51. It is also possible to have a structure that transmits from the inside to the outside surface.

  FIG. 14 also shows a main part of the fixing device 5 disposed in the electrophotographic image forming apparatus. The fixing device 5 includes a rotatable fixing roll 51 and a rotatable pressure roll 54. The fixing device 5 presses the recording medium together with the heater 1 that transfers heat to the fixing roll 51 and the pressure roll 54. A pressure roll 52 is disposed inside the fixing roll 51. The heater 1 is disposed along the cylindrical surface of the fixing roll 51.

  In the fixing device 5 shown in FIG. 13 or 14, the heater 1 generates heat by applying a voltage from a power supply device (not shown), and the heat is transmitted to the fixing roll 51. When a recording medium having an unfixed toner image on the surface is supplied between the fixing roll 51 and the pressing roll 54, the toner is brought into contact with the pressing roll 51 and the pressing roll 54. A fixed image is formed by melting. Since the fixing roller 51 and the pressure roller 54 are in pressure contact portions, they are rotated together. As described above, the heater 1 suppresses a local temperature rise that is likely to occur when a small recording medium is used. Therefore, temperature unevenness in the fixing roll 51 hardly occurs, and fixing is performed uniformly. Can do.

Another aspect of the fixing device including the heater 1 is a mold including an upper mold and a lower mold, in which a heater is disposed in at least one of the upper mold and the lower mold.
The fixing device provided with the heater 1 is mounted on an electrophotographic printing machine, an image forming apparatus such as a copying machine, a household electric product, a business use, an experimental precision instrument, etc., and is heated and kept warm. It is suitable as a heat source.

[3] Image Forming Apparatus An image forming apparatus provided with the heater can be appropriately selected depending on the heating object, the heating purpose, and the like. In the present invention, as shown in FIG. 15, an image forming means for forming an unfixed image on the surface of a recording medium such as paper or film, and a fixing means 5 for fixing the unfixed image to the recording medium are provided. The fixing unit 5 is preferably an image forming apparatus 4 including the heater 1. In addition to the above-described units, the image forming apparatus 4 can be configured to include a recording medium transport unit and a control unit for controlling each unit.

FIG. 15 is a schematic view showing a main part of the electrophotographic image forming apparatus 4. The image forming means may be either a system with a transfer drum or a system without a transfer drum, but FIG. 15 shows an embodiment with a transfer drum.
In the image forming unit, the toner supplied from the developing unit 45 is irradiated with the laser output from the laser scanner 41 on the charging processing surface of the photosensitive drum 44 that has been charged to a predetermined potential by the charging device 43 while rotating. As a result, an electrostatic latent image is formed. Next, the toner image is transferred onto the surface of the transfer drum 46 that is linked to the photosensitive drum 44 using the potential difference. Thereafter, the toner image is transferred onto the surface of the recording medium supplied between the transfer drum 46 and the transfer roll 47, and a recording medium having an unfixed image is obtained. The toner is particles containing a binder resin, a colorant, and an additive, and the melting temperature of the binder resin is usually 90 ° C. to 220 ° C. A cleaning device for removing insoluble toner or the like can be provided on the surfaces of the photosensitive drum 44 and the transfer drum 46.

  The fixing unit 5 can have the same configuration as the fixing device 5. The fixing unit 5 includes a pressurizing roll 54 and a heater holder 53 that holds the sheet-passing direction energization type heater 1, and interlocks with the pressurizing roll 54. A fixing roll 51. A recording medium having an unfixed image from the image forming means is supplied between a fixing roll 51 and a pressing roll 54. The heat of the fixing roll 51 melts the toner image on the recording medium, and the melted toner is further pressurized at the pressure contact portion between the fixing roll 51 and the pressing roll 54, so that the toner image becomes a recording medium. To be established. The fixing unit 5 shown in FIG. 15 may include a fixing belt in which the heater 1 is disposed close to the fixing roll 51.

Generally, when the temperature of the fixing roll 51 becomes uneven and the amount of heat applied to the toner is too small, the toner is peeled off from the recording medium. On the other hand, when the amount of heat is too large, the toner is transferred to the fixing roll 51. The fixing roll 51 may make a round and reattach to the recording medium. According to the fixing unit 5 including the heater of the present invention, the temperature can be quickly adjusted to a predetermined temperature, so that problems can be suppressed.
The image forming apparatus of the present invention is suitable as an electrophotographic printing machine, copying machine, or the like because excessive temperature rise in the non-sheet passing area is suppressed during use.

[4] Heating device A heating device including the heater can be appropriately selected depending on the size and shape of the heating target. In the present invention, for example, a housing portion, a sealable window portion disposed for taking in and out of the object to be heat treated, and a movable heater portion disposed inside the housing portion are provided. Can be configured. If necessary, the heat treatment object installation part for placing the heat treatment object inside the case part, the exhaust part for discharging this gas when the gas is discharged by heating the heat treatment object, the case part A pressure adjusting unit such as a vacuum pump for adjusting the internal pressure can be provided. Further, the heating may be performed in a state where the object to be heat-treated and the heater portion are fixed, or may be performed while either one is moved.
This heating apparatus is suitable as an apparatus for drying a heat-treated object containing water, an organic solvent, or the like at a desired temperature. And it can use as a vacuum dryer (vacuum dryer), a pressure dryer, a dehumidification dryer, a hot air dryer, an explosion-proof dryer, etc. Moreover, it is suitable as an apparatus for firing unfired materials such as LCD panels and organic EL panels at a desired temperature. And it can be used as a reduced-pressure baking machine, a pressure baking machine, etc.

[5] Manufacturing method of heater As described above, a manufacturing method of the heater (1) including the plurality of heat generating portions (10) disposed on the base (11) is as follows.
A power supply wiring forming step for forming two power supply wirings (13 (13a, 13b)) separated for each heat generating part (10) and separated from each other using a conductive material;
A resistance heating wiring forming step of forming the resistance heating wiring (12) so as to connect the power supply wirings (13a, 13b) using a resistance heating material in each heating section (10);
After the power supply wiring (13) and the resistance heating wiring (12) are formed, the resistance value measuring means measures the resistance value between the power supply wirings (13a, 13b) for each heat generating part (10). Process,
For each heat generating part (10), the resistance value measured by the measuring step is compared with a predetermined range by the calculation means, and when the resistance value exceeds the predetermined range, the resistance value is set to the predetermined range. A calculation step of obtaining, as a correction length, a length that substantially shortens the resistance heating wiring (12) for correction;
Between the two points of the resistance heating wiring (12) and between the one point of the resistance heating wiring (12) and the power supply wiring (13) so as to shorten the length of the resistance heating wiring (12) by the correction length. A correction bridge forming step of forming one or more correction bridges (14) connecting at least one of them with a conductive material;
A power supply bridge forming step of forming a power supply bridge (15) for connecting one power supply wiring (13a) and the other power supply wiring (13b) of each heat generating section (10) with a conductive material;
It can comprise.
Hereinafter, each process will be described with reference to FIG. In the following description, the details of the heater 1 and each part thereof are the same as the contents of the above [1], and will be omitted.

(1) Power Supply Wiring Forming Step Patterns of power supply wirings 13 (13a, 13b) of all the heat generating portions 10 as shown in FIG. 16A are formed on the base 11 using a conductive material. Regardless of the pattern of the power supply wiring 13, for example, as shown in FIG. 1, in each heat generating portion 10, one of the power supply wirings 13 a is formed at one end on the base 11. The other 13b may be formed at the other end on the base 11. The conductive material to be used is as described above. The pattern can be formed by printing the conductive material on the substrate 11 and baking it. The power supply wiring 13 can be provided with a land portion for later measuring the resistance value of each heat generating portion 10 as necessary.

(2) Resistance Heating Wiring Formation Step A pattern of resistance heating wiring 12 of all the heat generating portions 10 as shown in FIG. 16B is formed on the base 11 using a resistance heating material. As the resistance heating material to be used, a conductive material whose resistance value varies depending on the temperature can be selected. The pattern can be formed by printing the resistance heating material on the substrate 11 and baking it. The thickness of the resistance heating wiring 12 is preferably 3 to 20 μm from the viewpoint of area specific resistance.
Either the resistance heating wiring forming process or the power feeding wiring forming process may be performed first. The resistance heating wiring 12 and the power supply wiring 13 are electrically connected to each other at the portion where the wiring formed earlier and the wiring formed later are laminated.

(3) Measurement process After the power supply wiring 13 and the resistance heating wiring 12 are formed, in the measurement process, two power supply wirings (13a, 13b) are provided for each heat generating part 10 by the resistance value measuring means for measuring the resistance value. ) Measure the resistance value between. The resistance value and the temperature coefficient of resistance can be measured according to JIS C2526. The specific configuration of the resistance value measuring means is not limited. The measured resistance value is sent to the next calculating means.

(4) Calculation process In the calculation process, the resistance value of the resistance heating wiring 12 measured in the measurement process is compared with a predetermined range for each heat generating part 10 by the calculation means, and the resistance value exceeds the predetermined range. This is a step of obtaining a length (correction length L) that substantially shortens the resistance heating wiring 12 in order to correct the resistance value to the predetermined range. The computing means can be configured using a computer. The calculating means can be configured to input the resistance values of all the heat generating units 10 measured in the measuring step.

  The “predetermined range” can be arbitrarily set. For example, a predetermined ratio (for example, 0.95 to 1.05) can be set with a predetermined resistance value as a reference. Moreover, it can also be set as the range of a fixed ratio (for example, 1.00 to 1.05) etc. on the basis of the smallest resistance value among the resistance values measured about all the heat generating parts 10. About the heat generating part 10 in which the resistance value exceeding such a predetermined range (for example, exceeding 1.05 times the reference resistance value) is measured, a predetermined ratio (for example, the reference resistance value) , 1.00 to 1.05), the length L that substantially shortens the resistance heating wiring 12 can be obtained by calculation as a correction length. The calculation method is not particularly limited. For example, the correction length L can be calculated based on the resistivity of the resistance heating material and the width and thickness of the wiring. When the resistance value of the resistance heating wiring 12 is within the predetermined range, the heating bridge 10 can be set not to provide the correction bridge 14.

Further, the calculation means makes the length of the resistance heating wiring 12 to be substantially shortened by the correction length L based on the calculated correction length L and the wiring pattern of the anti-heat generation wiring 12 for each heat generating portion 10. In addition, the position where one or more correction bridges 14 are formed can be calculated.
Further, the calculation means can be configured to send the correction length L calculated for each heat generating portion 10 or data such as the position of the correction bridge 14 to be provided to the next correction bridge forming step.

(5) Correction Bridge Formation Step In the correction bridge formation step, the length of the resistance heating wiring 12 is shortened by the correction length L based on data such as the correction length L obtained by the calculation step for each heat generating portion 10. In this step, one or more correction bridges 14 are formed. The correction bridge 14 connects at least one of the two points of the resistance heating wiring 12 and between one point of the resistance heating wiring 12 and the power supply wiring 13. Since the correction bridge 14 is formed using a conductive material, the section connected by the correction bridge 14 is electrically short-circuited. A plurality of correction bridges 14 may be formed, and the length of the resistance heating wiring 12 may be shortened by the correction length L by combining the connection sections of the correction bridges 14.

  The part where the correction bridge 14 is provided is not particularly limited. For example, as shown in FIG. 4A, at least one correction bridge 141 can be provided so as to connect one point of the resistance heating wiring 12 and the power supply wiring 13b. Further, as shown in FIG. 5B, at least one correction bridge 143 can be provided so as to connect the resistance heating wirings 12. Further, as shown in FIG. 3C, at least one correction bridge 144 can be provided so as to overlap the line of the resistance heating wiring 12. Further, as shown in FIG. 6D, at least two correction bridges 142 connect points having the same length from each end of the resistance heating wiring 12 and power supply wirings (13a, 13b) on each end side. Can be provided.

  As shown in FIG. 16C, the correction bridge 14 is formed at the set portion for each heat generating portion 10 on the base 11 on which the resistance heat generating wiring 12 and the power supply wiring 13 are formed. The conductive material used is preferably a conductive paste using silver or the like. The correction bridge 14 is provided by printing the conductive material so as to be laminated on the resistance heating wiring 12 and the power supply wiring 13 and baking the conductive material.

(6) Power Supply Bridge Formation Step In the power supply bridge formation step, a power supply bridge 15 that connects one power supply wiring 13a and the other power supply wiring 13b of each heat generating portion 10 with a conductive material is formed. The
As shown in FIG. 16D, the power supply bridge 15 is formed on the base 11 on which the resistance heating wiring 12, the power supply wiring 13, and the correction bridge 14 are formed. The conductive material used is preferably a conductive paste using silver or the like. The power supply bridge 15 is provided by printing and baking the conductive material on the base 11 on which the resistance heating wiring 12, the power supply wiring 13, and the correction bridge 14 are formed.
The power supply bridge 15 may be formed simultaneously with the correction bridge 14.

  As shown in FIG. 8, the heater 1, while facing the object 2 to be heated, sweeps at least one of the object 2 and the heater 1 in a predetermined sweep direction D to be heated 2. May be used to heat. In such a heater 1, it is preferable that the heat generating portions 10 are arranged side by side in a direction orthogonal to the sweep direction D. Then, by the resistance heating wiring forming step, in each heating part 10, the resistance heating wiring 12 can be formed to include a plurality of main pattern portions provided at an angle θ within a predetermined range with respect to the orthogonal direction. .

  Further, the heater 1 used as described above has a cross-sectional shape in the sweep direction D of the base body 11 in a circular arc shape that is convex on the side facing the object to be heated 2 with an axis orthogonal to the sweep direction D as a center. It is preferable (see FIGS. 10 and 11). And it is preferable that each heat generating part 10 is arrange | positioned on the said convex surface or the surface on the opposite side. However, when the heating surface of the heater 1 is a curved surface that is a part of a cylinder, the thickness and the line width of the resistance heating wiring 12 are not uniform according to a general printing technique. It is difficult to form the resistance heating wiring 12 with high precision over the entire area. According to the method for manufacturing the heater, uniform heat generation characteristics can be obtained over the entire heat generating surface of the heater 1 simply by providing the correction bridge 14 so as to correct the resistance value after the resistance heat generation wiring 12 is formed. .

[6] Effect of this heater As an example, a heater 1 as shown in FIG. 17 was produced by the manufacturing method described above. The base 11 of the heater 1 is made of stainless steel (SUS430) and has a size of 20 mm in length and 420 mm in width. An insulating layer having a film thickness of 85 μm using crystallized glass is provided on the surface of the substrate 11. A heat generating area 100 having a length of 15 mm and a width of 315 mm is provided on the base 11, and 20 heat generating portions 10 are arranged in the heat generating area 100 in a horizontal direction by a wiring pattern as shown in FIGS. 1 and 5. It is installed.
The resistance heating wiring of each heating unit 10 was formed by printing the wiring of the pattern using a paste containing silver-palladium without containing lead, cadmium, and nickel, and firing at 850 ° C. The resistance heating wiring is printed on the basis of a line width of 0.8 mm and a thickness of 10 μm.
Moreover, the power supply wiring of each heat generating part 10 was formed by printing at 850 ° C. after printing using a silver paste.

  After the formation of the resistance heating wiring and the power supply wiring, the resistance value of the resistance heating wiring of each heating portion 10 was measured. For a heat generating part having a resistance value exceeding a certain value, a length (correction length) for substantially shortening the resistance heating wiring is required to make the resistance value constant, and both ends of the resistance heating wiring are obtained. The position where the correction bridge is provided between the power supply wiring and the power supply wiring is set. The correction bridge is formed by printing at 850 ° C. after printing using silver paste at the set position for each heat generating portion.

Next, a power supply bridge connecting the power supply wirings of each heat generating part was formed by printing at 850 ° C. after printing using a silver paste.
After the above steps, the heater 1 of the example was obtained by providing a protective layer using crystallized glass so as to cover the entire wiring portion on the substrate and a topcoat layer further using amorphous glass.
Moreover, the heater as a comparative example was created by the same manufacturing process as described above except that the correction bridge was not provided.

FIG. 18 shows measured values of the temperature of the heat generating region 100 for (a) the heater 1 of the example (supply voltage of about 30 V) and (b) the heater of the comparative example (supply voltage of about 28 V). The vertical axis of the graph is temperature, and the horizontal axis x corresponds to the horizontal position of the heat generation region shown in FIG.
Since the resistance value of the heater of the comparative example is not corrected, the temperature distribution in the lateral direction of the heat generating region 100 changes as shown in FIG. On the other hand, in the heater 1 of the embodiment, since a correction bridge for correcting the resistance value of each heat generating portion 10 is provided, as is apparent from FIG. Distribution is uniform.

  The present invention is not limited to the specific embodiments described above, and various modifications can be made within the scope of the present invention depending on the purpose and application.

1; heater,
10; heating part,
11; substrate
12; resistance heating wiring; 121; main pattern portion; 122; connection pattern portion;
13, 13a, 13b; wiring for feeding, 131, 131a, 131b; feeding terminal,
14, 141, 142, 143, 144; correction bridge,
15, 15a, 15b; feeding bridge,
2; heated object,
4; Image forming apparatus, 41: Laser scanner, 42: Mirror, 43: Charging device, 44: Photosensitive drum, 45: Developer, 46: Transfer drum, 47: Transfer roll,
5: fixing device (fixing means), 51: fixing roll, 52: pressurizing roll, 53: heater holder, 54: pressurizing roll,
P: Recording medium.

Claims (13)

A heater comprising a plurality of heat generating portions disposed on a substrate,
Two power supply wirings made of a conductive material that is separated for each of the heat generating parts and provided to be separated from each other;
Each of the heat generating portions has a plurality of main pattern portions and a connection pattern portion for connecting the main pattern portions in series, and is wired so as to connect the power supply wires using a resistance heat generating material . Resistance heating wiring,
For each of the heat generating portions, when the resistance value between both ends of the resistance heating wiring measured after the wiring exceeds a predetermined range, the conductive heating material is connected between one point of the resistance heating wiring and the power supply wiring. One or more correction bridges,
A power supply bridge that connects one of the power supply wirings and the other of the power supply wirings of each of the heat generating portions with a conductive material;
A heater comprising:   The heater according to claim 1, wherein at least two of the correction bridges respectively connect a point having the same length from each end of the resistance heating wiring and the power supply wiring on each end side. A heater that heats the object to be heated by sweeping at least one of the object to be heated and the main heater in a predetermined sweep direction while facing the object to be heated,
Each of the heat generating parts is arranged side by side in a direction orthogonal to the sweep direction,
3. The heater according to claim 1, wherein in each of the heat generating portions, the resistance heat generating wiring includes a plurality of main pattern portions provided at an angle within a predetermined range with respect to the orthogonal direction. The cross-sectional shape of the substrate in the sweep direction is an arc shape that is convex on the side facing the object to be heated around an axis orthogonal to the sweep direction,
The heater according to claim 3 , wherein each of the heat generating portions is disposed on the convex surface or on the opposite surface. The resistance heating material is a conductive material whose resistance value varies depending on temperature,
The correction heater according to any one of claims 1 to 4 bridge and the conductive material used for the power supply bridge is a conductive paste. A fixing device, characterized in that it comprises a heater according to any one of claims 1 to 5. An image forming apparatus comprising: a heater according to any one of claims 1 to 5. Heating device, characterized in that it comprises a heater according to any one of claims 1 to 5. A method for manufacturing a heater comprising a plurality of heat generating portions disposed on a substrate,
A power supply wiring forming step in which two power supply wirings separated for each heat generating part and separated from each other are formed using a conductive material;
Each of the heat generating portions has a plurality of main pattern portions and a connection pattern portion for connecting the main pattern portions in series, and one resistance heat generating wiring is used to connect the power supply wirings using a resistance heat generating material. Forming a resistance heating wiring,
After the power supply wiring and the resistance heating wiring are formed, a measurement step of measuring a resistance value between the power supply wirings for each of the heat generating parts by a resistance value measuring unit;
The calculation means compares the resistance value measured in the measurement step with respect to each heating unit with a predetermined range, and corrects the resistance value to the predetermined range when the resistance value exceeds the predetermined range. Therefore, a calculation process for obtaining a length that substantially shortens the resistance heating wiring as a correction length,
Correction bridge formation that forms one or more correction bridges connecting one point of the resistance heating wiring and the power supply wiring with a conductive material so that the length of the resistance heating wiring is shortened by the correction length Process,
A power supply bridge forming step of forming a power supply bridge that connects the power supply wirings of one of the heat generating parts and the other power supply wirings with a conductive material;
A method for manufacturing a heater, comprising: The at least two correction bridges are formed by the correction bridge forming step so as to connect a point having the same length from each end of the resistance heating wiring and the power supply wiring on each end side. The manufacturing method of the heater of 9 . A method for manufacturing a heater that heats the object to be heated by sweeping at least one of the object to be heated and the main heater in a predetermined sweep direction in a state of facing the object to be heated,
Each of the heat generating parts is arranged side by side in a direction orthogonal to the sweep direction,
By the resistance heating wire formation step, in each of the heat generating portion, the resistance heating wire, according to claim 9 or 10 with respect to the perpendicular direction is formed with a plurality of main pattern portions provided at an angle within a predetermined range A method for producing the heater according to 1. The cross-sectional shape of the substrate in the sweep direction is an arc shape that is convex on the side facing the object to be heated around an axis orthogonal to the sweep direction,
The method for manufacturing a heater according to claim 11 , wherein each of the heat generating portions is disposed on the convex surface or on the opposite surface. The resistance heating material is a conductive material whose resistance value varies depending on temperature,
The correction bridge and the conductive material used for the power supply bridge heater manufacturing method according to any one of claims 9 to 12 is a conductive paste.

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